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WO2009008566A1 - Équipement de communication sans fil par courant porteur, système de communication à large bande par courant porteur possédant celui-ci, et procédé apparenté - Google Patents

Équipement de communication sans fil par courant porteur, système de communication à large bande par courant porteur possédant celui-ci, et procédé apparenté Download PDF

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Publication number
WO2009008566A1
WO2009008566A1 PCT/KR2007/003452 KR2007003452W WO2009008566A1 WO 2009008566 A1 WO2009008566 A1 WO 2009008566A1 KR 2007003452 W KR2007003452 W KR 2007003452W WO 2009008566 A1 WO2009008566 A1 WO 2009008566A1
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WO
WIPO (PCT)
Prior art keywords
wireless communication
per
bit
bpl
power line
Prior art date
Application number
PCT/KR2007/003452
Other languages
English (en)
Inventor
Sang Wook Kang
Original Assignee
Omnipas Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Omnipas Inc. filed Critical Omnipas Inc.
Publication of WO2009008566A1 publication Critical patent/WO2009008566A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5429—Applications for powerline communications
    • H04B2203/5441—Wireless systems or telephone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5429—Applications for powerline communications
    • H04B2203/5454—Adapter and plugs

Definitions

  • the present invention relates to a broadband over power lines (BPL) communication system, and more particularly, to a power line/wireless communication equipment for performing both of BPL communication and wireless communication and for reducing the influence of noise in the wireless communication, a BPL communication system including the same, and a method thereof.
  • BPL broadband over power lines
  • Broadband services may be provided through a diversity of technology, network structures and transmission methods.
  • Representative broadband technology includes digital subscriber lines (DSLs), optical cables, coaxial cables, wireless communications, and broadband over power lines (BPL).
  • DSLs digital subscriber lines
  • BPL broadband over power lines
  • BPL is technology which allows signals (or data) to be transmitted over power lines at high speed, and the term has been officially used, replacing the term "power line communication (PLC)", by the Federal Communication Commission of the United States since 2004 with the development of modem technology.
  • PLC power line communication
  • BPL is a communication method of transmitting a communication signal (or digital information) of several hundreds of kHz to several tens of MHz over a 60 Hz power waveform used in a power line originally used to deliver power.
  • transmitted communication signal is sorted out using a high-frequency filter.
  • BPL allows a user to be provided with superhigh speed Information telecommunication services such as Internet access by connecting a BPL repeater to an existing power line without installing additional communication lines when the user plugs a terminal into a power outlet.
  • Power lines have already been installed in a wide area and to each room in every house or building. Since BPL using such power lines that have been installed to everywhere in houses instead of using Ethernet cables or satellite connection can be easily and readily used without problems of wiring or setting, many researches and developments have been performed to commercialize high-speed Internet transmission using power lines.
  • BPL technology was mainly used for home networking due to the limit of performance.
  • modem technology such as commercialization of 200 Mbps BPL modem chips
  • various approaches using the BPL technology for access networks have been accomplished. Accordingly, a full BPL-based access network in which the BPL technology is used fully from an injection point leading to a power line to a customer premises equipment (CPE) is avoided, and a hybrid BPL-based access network is gaining forces, in which the BPL technology is used only in a section of telegraph poles, at which a medium voltage (MV) line or a low voltage (LV) line is installed, and a last mile to a CPE is constructed wirelessly or using a telephone line or a coaxial cable.
  • MV medium voltage
  • LV low voltage
  • FIG. 1 is a block diagram of a conventional power line/wireless communication equipment 3.
  • FIGS. 2 and 3 illustrate frequency bands defined in Institute of Electrical and Electronics Engineers (IEEE) 802.11a and IEEE 802.11b wireless communication standards, respectively.
  • the power line/wireless communication equipment 3 detects data in a power line, converts the data into wireless data, and transmits the wireless data (or signal) to a CPE (not shown) through an antenna 1.
  • the power line/ wireless communication equipment 3 converts wireless data received from the CPE into BPL data and transmits it to the power line.
  • the power line/wireless communication equipment 3 includes a BPL module 5 and a wireless module 7.
  • the BPL module 5 interfaces with the power line and functions as a BPL modem, which receives and demodulates data from the power line and modulates data to be transmitted to the power line.
  • the wireless module 7 is a wireless access point (AP), which receives a demodulated signal from the BPL module 5, converts the received signal into wireless data or a wireless signal, transmits the signal to the CPE via the antenna 1, and demodulates a signal received from the CPE.
  • AP wireless access point
  • the BPL module 5 transfers signals at a rate of several hundreds of KHz to several tens of MHz and the wireless module 7 transfers signals at a rate of several GHz.
  • the BPL module 5 and the wireless module 7 use different frequency bands, they may be affected by circuit noise of each other according to system operation since they are connected in terms of circuit. For instance, since the BPL module 5 and the wireless module 7 share a ground, circuit noise occurring during high-clock signal processing and high-power signal conversion may affect both of the BPL module 5 and the wireless module 7.
  • the IEEE 802. l la wireless communication standard uses the 5 GHz band, transmits data through 12 non-overlapping channels whose central frequencies are 20 MHz apart and which have a width of 20 MHz, and uses orthogonal frequency division multiplexing (OFDM) modulation.
  • OFDM orthogonal frequency division multiplexing
  • FIG. 3 which illustrates the frequency bands defined in the IEEE
  • the IEEE 802.11b wireless communication standard uses the 2.4 GHz band, transmits data through 14 overlapping channels whose central frequencies are 5 MHz apart and which have a width of 24 (actually, 22) MHz, and uses direct sequence spread spectrum (DSSS) modulation.
  • DSSS direct sequence spread spectrum
  • an IEEE 802.16 wireless communication standard uses a 10-66 GHz band and transmits data with a bandwidth of 20/25/28 MHz.
  • An IEEE 802.16a wireless communication standard uses a 2- 11 GHz band and transmits data with a bandwidth of 1.5-20 MHz.
  • An IEEE 802.16e wireless communication standard uses a 2-6 GHz band and transmits data with a bandwidth of 1.5-20 MHz.
  • the wireless module 7 may use one of various wireless communication standards. Electromagnetic circuit noise occurring due to various types of radio frequency (RF) modulation frequencies, frequency bands, transmission power and signal processing technology may affect the data transmission performance of the BPL module 5. Disclosure of Invention Technical Problem
  • the present invention provides a power line/wireless communication equipment for reducing the influence of noise due to wireless communication by storing in advance bit-per-bin information regarding to each of various wireless communication protocols and converting data based on the bit-per-bin information regarding to a current wireless communication protocol, a broadband over power lines (BPL) communication system including the same, and a method thereof.
  • BPL broadband over power lines
  • the present invention also provides a power line/wireless communication equipment for reducing the influence of noise due to wireless communication by updating bit-per-bin information based on at least one among a signal attenuation and a signal-to-noise ratio of modulated or demodulated data and converting data based on the updated bit-per-bin information, a BPL communication system including the same, and a method thereof.
  • a broadband over power lines (BPL) communication system including the same, and a method thereof, bit-per-bin information regarding to each of various wireless communication protocols is stored in advance and data is converted based on the bit-per-bin information regarding to a current wireless communication protocol. Therefore, the influence of noise can be reduced without a complicated process of computing bit-per-bin information.
  • BPL broadband over power lines
  • bit-per-bin information stored in advance is updated based on at least one among a signal attenuation and a signal-to-noise ratio, the influence of noise occurring in an external equipment, an internal circuit, or a transmission line can be reduced and a connection state can be maintained stable with respect to rapid external noise.
  • FIG. 1 is a block diagram of a conventional power line/wireless communication equipment.
  • FIGS. 2 and 3 illustrate frequency bands defined in Institute of Electrical and
  • IEEE 802.11a and IEEE 802.11b wireless communication standards respectively.
  • FIG. 4 is a block diagram of a broadband over power lines (BPL) communication system according to an embodiment of the present invention.
  • BPL broadband over power lines
  • FIG. 5 is a block diagram of a power line/wireless communication equipment illustrated in FIG. 4, according to an embodiment of the present invention.
  • FIGS. 6 through 8 illustrate a bit-per-bin information table stored in the power line/ wireless communication equipment illustrated in FIG. 4.
  • FIG. 9 illustrates bit-per-bin information detected from the bit-per-bin information table illustrated in FIGS. 6 through 8.
  • FIG. 10 is a block diagram of a power line/wireless communication equipment illustrated in FIG. 4, according to another embodiment of the present invention.
  • FIG. 11 illustrates a procedure in which a channel character analysis block illustrated in FIG. 10 updates bit-per-bin information.
  • FIG. 12 is a flowchart of a data transfer method of a power line/wireless communication equipment, according to an embodiment of the present invention.
  • Best Mode for Carrying Out the Invention [28]
  • BPL broadband over power lines
  • CPE wireless customer premises equipment
  • power line/wireless communication equipment connected between the wireless CPE and the power line to perform data conversion between the power line and the wireless CPE.
  • the power line/wireless communication equipment may store bit- per-bin information regarding each of various wireless communication protocols in a bit-per-bin table in advance, detect bit-per-bin information corresponding to a current wireless communication protocol from the bit-per-bin table, and perform the data conversion based on the detected bit-per-bin information to transmit or receive converted data via the power line.
  • the BPL communication system may further include a BPL CPE configured to transmit and receive wire data through a low voltage power line.
  • the power line/ wireless communication equipment may be connected between the BPL CPE and the power line and may perform data conversion between the BPL CPE and the power line.
  • the various wireless communication protocols may include at least one among wireless communication protocols of Institute of Electrical and Electronics Engineers (IEEE) 802.11 family, wireless communication protocols of IEEE 802.16 family, and wireless communication protocols defined in standards other than the IEEE 802.11 family and the IEEE 802.16 family.
  • IEEE Institute of Electrical and Electronics Engineers
  • the power line/wireless communication equipment may include a wireless communication module configured to interface with the wireless CPE; a BPL interface module configured to transmit and receive data through the power line; and a BPL modem connected with the wireless communication module and the BPL interface module to perform data conversion between the wireless communication module and the BPL interface module.
  • the BPL modem may store bit-per-bin information regarding each of the various wireless communication protocols in a bit-per-bin table in advance, detect bit-per-bin information corresponding to a current wireless communication protocol from the bit-per-bin table, and perform the data conversion based on the detected bit-per-bin information.
  • the BPL modem may include a bit-per-bin information storage block configured to store the bit-per-bin information regarding each of the various wireless communication protocols in the bit-per-bin table in advance, receive protocol information about a wireless communication protocol of the wireless communication module from the wireless communication module, and detect and output bit-per-bin information corresponding to the received protocol information from the bit-per-bin table; and a modulator/demodulator configured to divide and allocate wireless data received from the wireless communication module to a plurality of frequency bins based on the bit- per-bin information, modulate the wireless data, and demodulate data received from the BPL interface module.
  • a data transfer method using a power line comprises receiving protocol information about a current protocol among various wireless communication protocols; detecting bit-per-bin information corresponding to the current protocol from a bit- per-bin table stored in advance based on the received protocol information; dividing and allocating data into a plurality of frequency bins based on the detected bit-per-bin information and modulating the data; and transferring the converted data through a power line.
  • the various wireless communication protocols may include at least one among wireless communication protocols of Institute of Electrical and Electronics Engineers (IEEE) 802.11 family, wireless communication protocols of IEEE 802.16 family, and wireless communication protocols defined in standards other than the IEEE 802.11 family and the IEEE 802.16 family.
  • IEEE Institute of Electrical and Electronics Engineers
  • FIG. 4 is a block diagram illustrating a network structure of a broadband over power lines (BPL) communication system 9 according to an embodiment of the present invention.
  • the BPL communication system 9 may include a power line/wireless communication equipment, i.e., a BPL-wireless gateway 10, a wireless customer premises equipment (CPE) 20, and a BPL CPE 30.
  • a BPL-wireless gateway 10 i.e., a BPL-wireless gateway 10
  • CPE wireless customer premises equipment
  • the BPL-wireless gateway 10 can perform both of wireless communication and
  • the BPL- wireless gateway 10 transmits data to and receives data from another BPL-wireless gateway 10 or the BPL CPE 30 via the power line 100 and/or 200 and also functions as a wireless connection device which performs wireless data communication with the wireless CPE 20 according to a predetermined wireless communication protocol.
  • the BPL-wireless gateway 10 may operate with connection to the medium voltage
  • MV low voltage
  • LV low voltage
  • voltage higher than 60,000 volts is classified as high voltage
  • voltage of 4,000 to 50,000 volts is classified as MV
  • voltage less than 600 volts is classified as LV
  • the classification ranges or the term indicating classified groups may be different in some cases.
  • the above-described MV is usually referred to as high voltage and the above-described high voltage is referred to as an extra high voltage.
  • the BPL-wireless gateway 10 stores bit-per-bin information regarding each of various wireless communication protocols in a bit-per-bin table in advance, detects bit- per-bin information corresponding to a current wireless communication protocol from the bit-per-bin table, and performs data modulation for BPL communication based on the detected bit-per-bin information. This operation will be described in detail later.
  • the various wireless communication protocols may include an Institute of Electrical and Electronics Engineers (IEEE) 802.11a standard (FIG. 2), an IEEE 802.11b standard (FIG. 3), an IEEE 802.16 standard, and other various wireless communication standards defined by the IEEE.
  • the BPL-wireless gateway 10 is connected with Internet 103 through a broadband backbone 101 and can thus interface input/output data between each of the wireless CPE 20 and the BPL CPE 30 and the Internet 103.
  • the BPL-wireless gateway 10 performs interface with the Internet 103, interface with other BPL-wireless gateways 10, and interface with the wireless CPE 20 and/or the BPL CPE 30.
  • the interface with other BPL-wireless gateways 10 includes a relay function of transmitting data from one BPL-wireless gateway 10 to another BPL-wireless gateway 10.
  • the broadband backbone 101 is connected between the Internet 103 and a plurality of BPL-wireless gateways 10 and controls data input/output between the Internet 103 and the BPL-wireless gateways 10.
  • the Internet 103 may be Internet connected via a wireless local area network (LAN), a mobile communication data network provided by a mobile telephone company, an International Mobile Telecommunications (IMT)-2000 network, a Wibro network, a code division multiple access (CDMA) network, a high speed downlink packet access (HSDPA) network, or a WiMax network.
  • LAN wireless local area network
  • IMT International Mobile Telecommunications
  • CDMA code division multiple access
  • HSDPA high speed downlink packet access
  • the BPL-wireless gateway 10 may be implemented by a BPL-WiFi gateway and thus be able to transmit and receive wireless data according to at least one wireless communication protocol in the IEEE 802.11 family.
  • Wireless communication protocols in the IEEE 802.11 family may be protocols defined in, for example, IEEE 802.11a, IEEE 802.11b, IEEE 802. Hg, and IEEE 802. Hn.
  • the BPL-wireless gateway 10 may be implemented by a BPL- WiMax gateway and thus be able to transmit and receive wireless data according to a wireless communication protocol defined in the IEEE 802.16 family.
  • WiMax complements WiFi technology so as to extend a range, in which Internet is available, outside buildings.
  • WiMax provides a service area of about 50 Km radius.
  • an IEEE 802.16d standard refers to WiMax.
  • the BPL-wireless gateway 10 may transmit and receive wireless data according to ZigBee, Bluetooth, or other wireless communication protocols. The BPL-wireless gateway 10 will be described in more detail with reference to FIGS. 2 through 8 later.
  • the wireless CPE 20 transmits wireless data to and receives wireless data from the
  • the wireless CPE 20 is installed in a customer's premises to allow user devices and equipments such as telephones, various data terminal devices, computers, multiplexers, and private exchanges to be used according to wireless communication protocols.
  • the wireless CPE 20 may be a modem, a digital service device, a data circuit-terminal equipment, a network terminal (e.g., NTl, NT2, or NT 1,2) in an integrated service digital network (ISDN), or a channel service unit (CSU).
  • ISDN integrated service digital network
  • CSU channel service unit
  • the BPL CPE 30 may transmit wire data to and receive wire data from the BPL- wireless gateway 10 via the LV power line 200.
  • the BPL CPE 30 When the BPL CPE 30 is plugged into a power outlet, it can transmit or receive wire data.
  • the BPL CPE 30 may be a modem, a digital service device, a data circuit- terminal equipment, a network terminal (e.g., NTl, NT2, or NT 1,2) in an ISDN, or a CSU.
  • Reference numeral 40 in FIG. 4 denotes a transformer.
  • FIG. 5 is a block diagram of a power line/wireless communication equipment 10 illustrated in FIG. 4, according to an embodiment of the present invention.
  • FIGS. 6 through 8 illustrate a bit-per-bin information table stored in the power line/wireless communication equipment 10 illustrated in FIG. 4.
  • FIG. 9 illustrates bit-per-bin information detected from the bit-per-bin information table illustrated in FIGS. 6 through 8.
  • BPL interface module 12 may include a BPL interface module 12, a BPL modem 14, and a wireless access point (AP) module 16.
  • AP wireless access point
  • the BPL interface module 12 is connected with the power line 100 or 200 so as to load information signals or data onto the power line 100 or 200 and isolate information signals or data only from the power line 100 or 200.
  • the BPL interface module 12 uses a coupling circuit to interrupt power in a low frequency band from the power line 100 or 200, extract only information signals in a high frequency band from the power line 100 or 200, and transmit the information signal to the BPL modem 14.
  • the BPL modem 14 performs data modulation and demodulation for BPL communication.
  • the BPL modem 14 is connected between the BPL interface module 12 and the wireless AP module 16 and performs data conversion.
  • the BPL modem 14 may store bit-per-bin information regarding each of various wireless communication protocols in a bit-per-bin table in advance, detect bit-per-bin information corresponding to a current wireless communication protocol from the bit- per-bin table, and perform the data conversion based on the detected bit-per-bin information.
  • the BPL modem 14 receives protocol information about a wireless communication protocol of the wireless AP module 16 from the wireless AP module 16, detects bit-per-bin information from the bit-per-bin table based on the received protocol information, and performs the data conversion based on the detected bit- per-bin information.
  • the BPL modem 14 uses discrete multi-tone (DMT) modulation, in which a whole available frequency band is divided into frequency bands having a particular width, and performs data modulation and demodulation based on the detected bit-per-bin information.
  • DMT discrete multi-tone
  • the bit-per-bin information corresponds to a current protocol among the various wireless communication protocols.
  • the bit-per-bin information shows that how many bits encoded using a predetermined modulation scheme (e.g., quadrature amplitude modulation (QAM) or phase shift keying (PSK)) are allocated to each bin.
  • a predetermined modulation scheme e.g., quadrature amplitude modulation (QAM) or phase shift keying (PSK)
  • QAM quadrature amplitude modulation
  • PSK phase shift keying
  • the BPL modem 14 may divide frequency into a plurality of bins and allocate bits to each of the bins based on the bit-per-bin information.
  • the BPL modem 14 may detect the particular bin based on the bit-per-bin information, reduce data transmission through the corrupt bin, and increase data transmission through bins free from noise during the modulation and demodulation.
  • the BPL modem 14 may include a bit-per-bin information storage block 141, a modulator/demodulator 143, a controller 144, a BPL control module 147, and a network control module 149.
  • the bit-per-bin information storage block 141 stores the bit-per-bin information regarding each of the various wireless communication protocols in the bit-per-bin table in advance, receives protocol information about a wireless communication protocol of the wireless AP module 16 from the wireless AP module 16, and detects and outputs bit-per-bin information corresponding to the received protocol information from the bit-per-bin table.
  • the bit-per-bin information storage block 141 may include a storage unit 141-1 and a bit-per-bin information sending unit 141-3.
  • the storage unit 141-1 stores the bit- per-bin table (illustrated in FIGS. 6 through 8) in advance.
  • graphs (a), (b), and (c) illustrated in FIG. 9 show bit-per-bin information made for frequency bins based on unique noise occurring in the IEEE 802.11 family or the IEEE 802.16 family.
  • the storage unit 141-1 may store in advance bit-per-bin information regarding the wireless communication protocols (e.g., the IEEE 802.11 family and the IEEE 802.16 family) in the bit-per-bin table as illustrated in FIGS. 6 through 8.
  • the bit-per-bin table illustrated in FIGS. 6 through 8 is an example which is made based on a DMT modulation scheme in which a bandwidth of 1-26 MHz is divided into 256 bins each having a bandwidth of 100 KHz and normally allocated with 6 bits.
  • the power line/wireless communication equipment 10 may store in advance the bit-per-bin information based on noise having unique feature according to a wireless communication protocol (e.g., the IEEE 802.11 family or the IEEE 802.16 family) and can quickly allocate bits to each bin based on bit-per-bin information corresponding to a wireless communication protocol (e.g., the IEEE 802.11 family or the IEEE 802.16 family) used by the wireless AP module 16 without performing noise analysis.
  • a wireless communication protocol e.g., the IEEE 802.11 family or the IEEE 802.16 family
  • the bit-per-bin information sending unit 141-3 receives the protocol information
  • the wireless AP module 16 (e.g., the IEEE 802.11 family or the IEEE 802.16 family) output from the wireless AP module 16 and fetches and outputs bit-per-bin information corresponding to a current wireless communication protocol from the storage unit 141-1 based on the received protocol information.
  • the wireless AP module 16 e.g., the IEEE 802.11 family or the IEEE 802.16 family
  • the bit-per-bin information sending unit 141-3 may detect protocol information (e.g., the IEEE 802.11 family or the IEEE 802.16 family) based on wireless data output from the wireless AP module 16 and fetch and output bit-per-bin information corresponding to the wireless communication protocol of the wireless AP module 16 from the storage unit 141-1.
  • protocol information e.g., the IEEE 802.11 family or the IEEE 802.16 family
  • the modulator/demodulator (or DMT modulator/demodulator) 143 divides and allocates wireless data received from the wireless AP module 16 to a plurality of frequency bins based on the bit-per-bin information output from the bit-per-bin information storage block 141 and then modulates the wireless data.
  • the BPL control module 147 receives transmission data modulated by the modulator/demodulator 143 and converts the transmission data so that the BPL interface module 12 can couple the transmission data to the power line 100 or 200.
  • the BPL interface module 12 couples the transmission data converted by the BPL control module 147 to the power line 100 or 200 so that the data can be transmitted through the power line 100 or 200.
  • the BPL control module 147 extracts reception data from a signal coupled by the BPL interface module 12.
  • the modulator/demodulator 143 demodulates the reception data extracted by the BPL control module 147.
  • the wireless communication protocol defined in the IEEE 802.1 Ia (FIG. 2) usually uses the 5 GHz band and transmits data through channels whose central frequencies are 20 MHz apart and which have a width of 20 MHz, and therefore, a processor (not shown) performs a large amount of calculation during signal modulation/demodulation at a bandwidth of 20 MHz. As a result, strong circuit noise may occur due to a clock used for the calculation.
  • the wireless communication protocol defined in the IEEE 802.1 Ib (FIG. 3) usually uses the 2.4 GHz band and transmits data through channels whose central frequencies are 5 MHz apart and which have a width of about 22 MHz, and therefore, a large amount of calculation is performed during signal modulation/demodulation at bandwidths of 5 MHz and 22 MHz. As a result, strong circuit noise may occur due to a clock used for the calculation. Also, the wireless communication protocol defined in the IEEE 802.16 usually uses a 10-66 GHz band and transmits data with a bandwidth of 20/25/28 MHz. As a result, strong circuit noise may occur in a band of 20, 25 or 28 MHz according to a bandwidth at which signal modulation/demodulation is performed.
  • the modulator/demodulator 143 performs modulation/demodulation based on the bit-per-bin information, which reduces bits allocated to a frequency bin having noise and increases bits allocated to neighboring bins less affected by the noise according to a current wireless communication protocol, thereby reducing the influence of the noise in the power line/ wireless communication equipment 10.
  • the wireless AP module 16 transmits and receives wireless data (or wireless signals) according to one protocol among the various wireless communication protocols.
  • the wireless AP module 16 may receive a signal demodulated by the modulator/demodulator 143, convert (e.g., modulate) the received signal according to a wireless communication protocol, and transmit the converted data to the wireless CPE 20 via an antenna 18.
  • the wireless AP module 16 may receive a signal generated in the wireless CPE 2, convert (e.g., demodulate) the received signal according to a wireless communication protocol, and transmit the converted signal to the modulator/demodulator 143.
  • the network control module 149 may be provided for the interface between the wireless AP module 16 and the modulator/demodulator 143.
  • the network control module 149 may convert data demodulated by the modulator/ demodulator 143 into a network stream and may convert a signal received from the wireless AP module 16 so that the modulator/demodulator 143 can modulate/ demodulate the signal.
  • the controller 144 controls the operations of the BPL control module 147 and the network control module 149.
  • FIG. 10 is a block diagram of a power line/wireless communication equipment 10 illustrated in FIG. 4, according to another embodiment of the present invention.
  • FIG. 11 illustrates a procedure in which a channel character analysis block 145 illustrated in FIG. 10 updates bit-per-bin information.
  • the power line/wireless communication equipment 10 may include the BPL interface module 12, a BPL modem 14' and the wireless AP module 16.
  • the power line/wireless communication equipment 10 further includes the channel character analysis block 145 as compared to the power line/wireless communication equipment 10 illustrated in FIG. 4.
  • the channel character analysis block 145 may calculate at least one among signal attenuation and a signal-to-noise ratio (SNR) with respect to data modulated/demodulated by the modulator/demodulator 143 and output a calculation result. For instance, the channel character analysis block 145 may calculate and output the SNR of data, which has been modulated/demodulated based on bit-per-bin information, as illustrated in FIG. 11.
  • SNR signal-to-noise ratio
  • the bit-per-bin information storage block 141 may update the bit-per-bin information based on the calculation result and output updated bit-per-bin information.
  • the bit-per-bin information storage block 141 may detect a frequency range NR having a small SNR based on an SNR of data modulated/demodulated according to the bit-per-bin information and then update the bit-per-bin information by reducing the number of bits allocated to the small SNR frequency range NR and increasing the number of bits allocated to neighboring bins having less influence of the noise.
  • the bit-per-bin information storage block 141 may further include a bit-per-bin allocation unit 141-5 to update the bit-per-bin information.
  • the updated bit-per-bin information may be output to the modulator/demodulator 143 by the bit-per-bin information sending unit 141-3.
  • the modulator/demodulator 143 may divide and allocate data to be transmitted to a power line to a plurality of frequency bins based on the updated bit-per-bin information and then modulates the wireless data.
  • the modulator/demodulator 143 may demodulate data received through the BPL interface module 12 and the BPL control module 147.
  • the power line/wireless communication equipment 10 may update bit-per-bin information regarding each of various wireless communication protocols, which is stored in advance in the bit-per-bin table (illustrated in FIGS. 6 through 8), based on signal attenuation or an SNR, thereby reducing the influence of noise occurring in an external equipment, an internal circuit, or a transmission line.
  • FIG. 12 is a flowchart of a data transfer method of a power line/wireless communication equipment, according to an embodiment of the present invention.
  • the bit-per-bin information storage block 141 receives protocol information about one of various wireless communication protocols from the wireless AP module 16 in operation SlOl.
  • the bit-per-bin information storage block 141 detects bit-per-bin information corresponding to a current wireless communication protocol in the bit-per-bin table (illustrated in FIGS. 6 through 8) based on the received protocol information in operation S 103.
  • the modulator/demodulator 143 performs data conversion based on the detected bit-per-bin information in operation S 105.
  • bit-per-bin information regarding to each of various wireless communication protocols is stored in advance and data is converted based on the bit-per-bin information regarding to a current wireless communication protocol. Therefore, the influence of noise can be reduced without a complicated process of computing bit-per-bin information.
  • bit-per-bin information stored in advance is updated based on at least one among a signal attenuation and a signal-to-noise ratio, the influence of noise occurring in an external equipment, an internal circuit, or a transmission line can be reduced and a connection state can be maintained stable with respect to rapid external noise.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

L'invention porte sur un équipement de communication sans fil par courant porteur, sur un système de communication à large bande par courant porteur (BPL) comprenant celui-ci, et sur un procédé apparenté. L'équipement de communication sans fil par courant porteur stocke des informations bits par compartiment concernant chacun divers protocoles de communication sans fil dans une table bits par compartiment à l'avance, détecte des informations bits par compartiment correspondant à un protocole de communication sans fil classique à partir de la table bits par compartiment, effectue la conversion de données sur la base des informations de bits par compartiment détectées, et transfère les données, réduisant ainsi l'influence d'un bruit se produisant dans une communication sans fil, sans traitement compliqué de calcul d'informations de bits par compartiment.
PCT/KR2007/003452 2007-07-09 2007-07-16 Équipement de communication sans fil par courant porteur, système de communication à large bande par courant porteur possédant celui-ci, et procédé apparenté WO2009008566A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2007-0068880 2007-07-09
KR1020070068880A KR100898278B1 (ko) 2007-07-09 2007-07-09 전력선 및 무선 통신 장치, 상기 전력선 및 무선 통신 장치를 포함하는 전력선 통신 시스템 및 그 방법

Publications (1)

Publication Number Publication Date
WO2009008566A1 true WO2009008566A1 (fr) 2009-01-15

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PCT/KR2007/003452 WO2009008566A1 (fr) 2007-07-09 2007-07-16 Équipement de communication sans fil par courant porteur, système de communication à large bande par courant porteur possédant celui-ci, et procédé apparenté

Country Status (2)

Country Link
KR (1) KR100898278B1 (fr)
WO (1) WO2009008566A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101136623B1 (ko) 2010-05-06 2012-04-18 한국전력공사 스마트 그리드 전력선 통신망과 융합한 기상정보 제공 시스템
CN104318750B (zh) * 2014-10-20 2017-10-17 华为技术有限公司 一种抄表的方法、装置和系统

Citations (5)

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US6243571B1 (en) * 1998-09-21 2001-06-05 Phonex Corporation Method and system for distribution of wireless signals for increased wireless coverage using power lines
KR20010079064A (ko) * 2001-06-11 2001-08-22 하경호 전력선 통신망을 연계한 rf 무선 통신 시스템
KR20040019672A (ko) * 2002-08-29 2004-03-06 엘지전자 주식회사 무선가입자망 단말기의 전력선망 데이터 통신장치
WO2004114630A1 (fr) * 2003-06-23 2004-12-29 Wusung Mpi Co. Ltd. Controleur programmable (plc) presentant une fonction de communication sans fil
KR20050031713A (ko) * 2003-09-30 2005-04-06 삼성전기주식회사 고속 전력선 통신을 이용한 무선랜 중계장치

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100466546B1 (ko) * 2003-04-10 2005-01-15 한국전자통신연구원 주파수 대역분할을 이용한 키 송수신 방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6243571B1 (en) * 1998-09-21 2001-06-05 Phonex Corporation Method and system for distribution of wireless signals for increased wireless coverage using power lines
KR20010079064A (ko) * 2001-06-11 2001-08-22 하경호 전력선 통신망을 연계한 rf 무선 통신 시스템
KR20040019672A (ko) * 2002-08-29 2004-03-06 엘지전자 주식회사 무선가입자망 단말기의 전력선망 데이터 통신장치
WO2004114630A1 (fr) * 2003-06-23 2004-12-29 Wusung Mpi Co. Ltd. Controleur programmable (plc) presentant une fonction de communication sans fil
KR20050031713A (ko) * 2003-09-30 2005-04-06 삼성전기주식회사 고속 전력선 통신을 이용한 무선랜 중계장치

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KR100898278B1 (ko) 2009-05-19
KR20090005677A (ko) 2009-01-14

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