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WO2013189007A1 - Procédé pour une transmission de programmes de radiodiffusion multimédia numérique basée sur des sauts de fréquence, procédé pour une réception de programmes de radiodiffusion multimédia numérique basée sur des sauts de fréquence, et systèmes correspondants - Google Patents

Procédé pour une transmission de programmes de radiodiffusion multimédia numérique basée sur des sauts de fréquence, procédé pour une réception de programmes de radiodiffusion multimédia numérique basée sur des sauts de fréquence, et systèmes correspondants Download PDF

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Publication number
WO2013189007A1
WO2013189007A1 PCT/CN2012/076807 CN2012076807W WO2013189007A1 WO 2013189007 A1 WO2013189007 A1 WO 2013189007A1 CN 2012076807 W CN2012076807 W CN 2012076807W WO 2013189007 A1 WO2013189007 A1 WO 2013189007A1
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WO
WIPO (PCT)
Prior art keywords
frequency hopping
frequency
hopping
transmitting
digital
Prior art date
Application number
PCT/CN2012/076807
Other languages
English (en)
Chinese (zh)
Inventor
邢观斌
李群
雷文
曹晓卫
邵迅
陶涛
Original Assignee
北京泰美世纪科技有限公司
北京泰合志恒科技有限公司
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 北京泰美世纪科技有限公司, 北京泰合志恒科技有限公司 filed Critical 北京泰美世纪科技有限公司
Priority to PCT/CN2012/076807 priority Critical patent/WO2013189007A1/fr
Publication of WO2013189007A1 publication Critical patent/WO2013189007A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/7136—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform

Definitions

  • the invention relates to a digital multimedia broadcast transmitting and receiving method and a system thereof, in particular to a digital multimedia broadcasting transmitting method, a receiving method and a system thereof based on frequency hopping technology, which are suitable for wireless audio including ground, satellite and the like.
  • wireless digital broadcasting system The biggest feature of wireless digital broadcasting system is its wide coverage, diverse geographical environment, complex and variable channel characteristics, and serious noise and interference.
  • wireless digital broadcasting systems In order to ensure effective coverage and reliable transmission of signals, wireless digital broadcasting systems must be able to fully adapt to poor transmission channels. characteristic.
  • Signal diversity techniques such as frequency diversity, are used to transmit signals in a frequency band much larger than the channel's coherent bandwidth, and are an effective means of overcoming the multipath and frequency selective fading of wireless channels.
  • different wireless systems must perform strict frequency planning for sharing wireless spectrum resources.
  • the new wireless transmission system must also be considered compatible with the original system and frequency planning to ensure the smooth evolution of the new technology. Therefore, when designing a new wireless transmission system, it is often faced with the contradiction between transmission bandwidth requirements and frequency planning compatibility.
  • digital audio transmission technologies such as HD-Rad io in the United States and DRM in Europe adopt a narrowband transmission scheme, and the system does not have frequency diversity. Gain, poor resistance to multipath and fading, results in less than ideal signal coverage.
  • another digital audio broadcasting DAB system has a signal transmission bandwidth of 1.536 MHz, which achieves frequency diversity to a certain extent, so the system's ability to resist multipath and fading is greatly improved, and signal coverage is correspondingly improved.
  • the DAB is incompatible with the original FM/AM frequency plan, which poses certain obstacles to the promotion and use of the DAB system.
  • each digital program is transmitted at a fixed frequency position, due to the limitation of existing frequency planning, for example, in a digital audio broadcasting system, due to the guarantee and the original simulation.
  • the frequency planning of FM/AM is compatible.
  • Each digital audio channel can only occupy a narrow bandwidth, FM is ⁇ ⁇ or 200KHz, and AM is 9KHz or 10KHz.
  • the main drawback of this broadcast scheme is that due to the spatial propagation characteristics of radio waves and multipath fading, the signal strength (or carrier-to-noise ratio) at different locations within the coverage area varies greatly, even near the launch pad. Geographical location may also result in signal quality below the demodulation threshold due to frequency selective fading of multipath.
  • FIG. 1 shows a schematic diagram of the frequency usage of a prior art broadcast system.
  • the channel response of a receiver location is in a pit of fading at digital frequencies 1 and 3, and cannot receive a sufficiently good signal.
  • Demodulation but the same receiver in the same position, can receive a strong received signal at digital frequencies 2 and 4.
  • the signal energy received at the strong frequency point well above the demodulation threshold does not help the reception at the weak frequency point.
  • the present invention proposes that, under the premise of being compatible with existing frequency planning constraints, a combination of frequency hopping technology and channel interleaving coding can be used to achieve a sufficiently high frequency diversity gain, and the system can improve multipath and wireless transmission.
  • the present invention provides a method for transmitting digital multimedia broadcast based on frequency hopping, comprising the following steps: setting, on a transmitting end, a plurality of frequency hopping subchannels for transmitting digital program data, wherein each frequency hopping subchannel corresponds to a specific hop a frequency point; the transmitting end sets a specific frequency hopping sequence for each digital program, the frequency hopping sequence is a specific arrangement of the partial frequency hopping subchannels of the plurality of frequency hopping subchannels; The data of the digital program is cyclically circulated and transmitted on the corresponding frequency hopping subchannel in accordance with its hopping sequence.
  • the hopping sequences of each of the digital programs are orthogonal to each other.
  • the sending end sends part of the frequency hopping control information corresponding to each digital program to the receiving end, and may also preset part of the frequency hopping control information at the transmitting end.
  • the frequency hopping control information includes hopping sequence information and transmission parameters of each hopping subchannel.
  • the hopping sequence information includes a hopping subchannel sequence number and a hopping time of each hopping subchannel, and the transmission parameters of each hopping subchannel include a transmission bandwidth, a transmission power, a modulation mode, a modulation solution, and an encoding mode. , a frequency template, or a combination thereof.
  • each of the digital program content may be transmitted according to a specific frame structure, where the frame structure includes a frequency hopping signal frame header and a plurality of frequency hopping time slots, and the frequency hopping signal frame header includes a synchronization header, each of which A frequency hopping interval is set between the frequency hopping time slots to ensure that the frequency transceiver has sufficient frequency stabilization time during the frequency hopping process.
  • the frequency hopping control information may be placed in the frame header of the frequency hopping signal, or may be Each of the hopping time slots includes frequency hopping control information associated with a next hopping time slot.
  • the invention also provides a digital multimedia broadcast receiving method based on frequency hopping, comprising the following steps: performing timing and frequency synchronization at the receiving end; acquiring frequency hopping control information corresponding to each digital program transmission at the receiving end; The acquired frequency hopping control information demodulates the data of each corresponding digital program.
  • the frequency hopping control information corresponding to the transmitting end is preset at the receiving end.
  • the invention also proposes a digital multimedia broadcast transmitting system based on frequency hopping, comprising: a data scrambling module for scrambling data of each digital program; a channel interleaving and encoding module for scrambling
  • the program data is channel interleaved and encoded, and the length of one coding block can span multiple frequency hopping subchannels;
  • the transceiver timing module is used for timing and controlling the framing process;
  • the physical layer framing module is used for The data output by the channel interleaving and coding module is modulated on different time slots of the physical layer frame structure and multiplexed with the frame header to form complete frame data;
  • a frequency hopping sequence generating module is used for controlling the timing module at the transmitting end.
  • the carrier modulation module according to the frequency hopping sequence of each digital program data Carrier modulation is performed on the corresponding frequency hopping subchannel; the combining module combines, digitizes, and transmits data of each digital program
  • the invention also proposes a digital multimedia broadcast receiving system based on frequency hopping, comprising: a timing and frequency synchronization module for timing and frequency synchronization; a frequency hopping control information acquisition module, configured for acquiring each digital program Transmitting the corresponding frequency hopping control information; and the demodulating module demodulating the data of each of the digital programs according to the obtained frequency hopping control information.
  • DRAWINGS 1 is a schematic diagram of a frequency usage mode of a prior art broadcast system;
  • FIG. 2 is a schematic diagram of a frequency usage mode according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a possible signal frame structure suitable for the present invention.
  • FIG. 5 is a flow chart of the receiving system of the present invention. detailed description
  • a method for transmitting a digital multimedia broadcast based on frequency hopping including: Step 1: setting, at a transmitting end, a plurality of frequency hopping subchannels for transmitting digital program data, wherein each frequency hopping The subchannel corresponds to a specific frequency hopping frequency point. Step 2: The transmitting end sets a specific hopping sequence for each digital program, and the hopping sequence is a specific arrangement of one or more of the plurality of hopping subchannels. Step 3: The transmitting end modulates and transmits the data of each digital program according to its hopping sequence on the corresponding hopping subchannel.
  • FIG. 2 is a schematic diagram of a frequency point usage manner according to an embodiment of the present invention, where four hopping subchannels are set at a transmitting end for transmitting digital program data, that is, four frequency hopping subchannels correspond to four frequency hopping frequency points, and a transmitting end Setting a specific hopping sequence for each digital program, which is a specific arrangement of one or more of the plurality of hopping subchannels, such as digital program 1 not being transmitted only at a fixed frequency position, but A plurality of frequency hopping frequency positions are hopped by a set frequency hopping sequence.
  • the frequency hopping sequence of the digital program 1 is a frequency hopping frequency point 1_> hopping frequency point 3 -> frequency hopping frequency point 2 -> hopping frequency Point 4.
  • the frequency hopping sequence is a repeated periodic sequence, and a fixed length of time is transmitted at each hopping frequency point, and the data of the digital program 1 is sequentially circulated and circulated on the corresponding hopping subchannel according to the hopping frequency sequence. .
  • the modulation is transmitted on the subchannel.
  • the frequency hopping sequence of the digital program 2 is a frequency hopping frequency point 2 -> frequency hopping frequency point 1 -> frequency hopping frequency point 4 -> frequency hopping frequency point 3.
  • each digital program data is modulated and transmitted on different frequency hopping subchannels, because different frequency hopping subchannels experience independent frequency selective fading Falling, frequency diversity is achieved, which greatly improves the ability of the receiving end to resist frequency selective fading.
  • the hopping sequences of each digital program can be set to be orthogonal to each other, thereby reducing mutual interference between programs, ensuring spectrum utilization rate of the system, and maximally repeating the utilization of the frequency hopping subchannel.
  • the frequency hopping sequence is a periodic repeating sequence, which may be fixedly configured or dynamically changed during program transmission.
  • all or part of the frequency hopping control information corresponding to each digital program may be sent to the receiving end at the transmitting end, or may be at the transmitting end and
  • the receiving end presets all or part of the frequency hopping control information to implement receiving at the receiving end.
  • the frequency hopping control information includes frequency hopping sequence information and transmission parameters of each frequency hopping subchannel, and the frequency hopping sequence information includes a frequency hopping subchannel sequence number and a frequency hopping time of each frequency hopping subchannel, where the hops
  • the transmission parameters of the frequency subchannel include transmission bandwidth, transmission power, modulation mode, modulation order, coding mode, frequency template, or a combination thereof.
  • the transmission parameters can be either associated or independent.
  • those skilled in the art can determine which frequency hopping control information is preset in advance on the transmitting end and the receiving end, and which frequency hopping control information is transmitted in real time between the transmitting end and the receiving end.
  • the transmission time at each hopping frequency point ie, the length of the hopping time slot
  • the modulation mode and transmission bandwidth can be transmitted and received at the transmitting end.
  • the terminal is pre-preset without having to occupy wireless resources for real-time transmission.
  • some frequency hopping control information needs to be transmitted in real time between the transmitting end and the receiving end, such as a frequency hopping sequence, a modulation order of each hopping frequency point, and an encoding mode.
  • each digital program content can be transmitted according to a specific frame structure, as shown in FIG. 3, which shows M frequency hopping time slots.
  • the frame structure can be designed in different formats according to design requirements.
  • the frame structure includes a frame header of a frequency hopping signal and a plurality of frequency hopping time slots.
  • the frame header of the frequency hopping signal includes a synchronization header, and each hopping time slot has a certain frequency hopping interval to ensure that the transceiver end is There is sufficient frequency stabilization time in the frequency jump process.
  • the frequency hopping control information may be centrally placed on the frame header of the frequency hopping signal, or may be included in each hopping time slot and the next frequency hopping frequency. Time slot related frequency hopping control information.
  • the synchronization header and control information can be transmitted at a fixed frequency.
  • a digital station program can have a fixed allocation of frequency hopping frequency points for transmitting synchronization and control information, but the program content is adopted.
  • Frequency hopping transmission can be transmitted.
  • the frame structure adopted by the present invention is not limited thereto, and those skilled in the art may select other frames capable of achieving the object of the present invention as needed. Structure to transfer.
  • the frequency hopping control information is repeatedly transmitted according to the frame structure, and adopts strong error correction coding and diversity protection to ensure that the receiving end can reliably receive important control information such as frequency hopping sequences under bad channel conditions.
  • FIG. 4 is a structural diagram of a transmission system according to the present invention, and each program source data stream 101-1 of the digital stations 1 to n, 101-2, ....
  • the scrambled program data is channel interleaved and encoded by the channel interleaving and encoding module 103, wherein the channel interleaving and encoding module 103 enables a coded block length to span a plurality of frequency hopping subchannels to achieve sufficient frequency diversity gain, and the encoded program data is passed to the physical layer framing module 104 for grouping according to the signal frame structure as shown in FIG.
  • the frame, the physical layer framing module 104 is used to output the data of the channel interleaving and encoding module 103.
  • the sender timing module 105 is used to time and control the framing process.
  • the hopping sequence generation module 106 generates pre-set hopping control information under the control of the transmitting terminal timing module 105 to generate a correct hopping frequency point corresponding to each of the hopping time slots. Since the data of each frequency hopping time slot should be modulated at a specific frequency hopping frequency point, the data in the frequency hopping time slot and the corresponding frequency hopping sequence generating module 106 must be controlled by the same transmitting terminal timing module 105, keeping Strict synchronization ensures that the correct frequency hopping frequency corresponding to each hopping time slot is generated.
  • the carrier modulation module 107 performs carrier modulation on the corresponding frequency hopping subchannel according to the indication of the hopping sequence according to the signal frame structure of each digital program data, and each of the hopping subchannels can independently adopt a single carrier or multiple Carrier, choose different modulation methods and modulation order.
  • the program data of each digital station can be independently modulated by the carrier, and finally the plurality of digital data are combined by the combining module 108, and the signals are amplified and transmitted.
  • the present invention provides a receiving method corresponding to the foregoing sending method, including the following steps: Step 1: Perform timing and frequency synchronization at the receiving end; Step 2: Acquire corresponding to each digital program transmission at the receiving end Frequency hopping control information; Step 3, demodulating data of each digital program according to the obtained frequency hopping control information.
  • the all or part of the frequency hopping control information may be sent to the receiving end by the transmitting end and received and demodulated by the receiving end, or may be preset to correspond to the transmitting end directly at the receiving end.
  • Frequency hopping control information to enable the reception of digital programs.
  • the present invention also provides a receiving system corresponding to the above-mentioned transmitting system. Referring to FIG. 5, it is a structural diagram of the receiving system of the present invention. After the receiving system is reset, the timing and frequency synchronizing module 201 uses FIG. The frame structure of the FM signal frame header information is used to synchronize the transmission signal timing and frequency.
  • the frequency hopping control information acquisition module 202 acquires the frequency hopping control information corresponding to each digital program transmission, and finally demodulates.
  • the module 203 demodulates the data of each of the corresponding digital programs according to the acquired frequency hopping control information to complete the reception of the program.
  • the invention can combine frequency hopping technology and channel interleaving coding under the premise of being compatible with existing frequency planning constraints, improve frequency diversity gain and the ability of the system to resist multipath and frequency selective fading in wireless transmission, and improve the broadcasting system. Effective coverage.
  • the present invention is applicable to satellite, terrestrial broadcast or other forms of multimedia digital broadcasting systems for digital audio and video, and various parameters involved can be flexibly configured according to different systems.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)

Abstract

La présente invention se rapporte à un procédé adapté pour exécuter une transmission de programmes de radiodiffusion multimédia numérique sur la base de sauts de fréquence. Le procédé de transmission selon l'invention comprend les étapes suivantes, consistant : à paramétrer une pluralité de sous-canaux à sauts de fréquence en vue de la transmission de données de programmes numériques à un terminal de transmission, chaque sous-canal à sauts de fréquence correspondant à un point d'un saut de fréquence spécifique ; à paramétrer, par le terminal de transmission, une séquence de sauts de fréquence spécifique pour chaque programme numérique de chaque canal, la séquence de sauts de fréquence correspondant à un agencement spécifique de parties de la pluralité de sous-canaux à sauts de fréquence ; et à faire circuler séquentiellement, par le terminal de transmission, des données de programme numérique de chaque canal sur le sous-canal à sauts de fréquence correspondant en vue d'exécuter une modulation et une transmission sur la base de la séquence de sauts de fréquence. La présente invention se rapporte d'autre part : à un procédé adapté pour exécuter une réception de programmes de radiodiffusion multimédia numérique sur la base de sauts de fréquence ; à un système de transmission correspondant au procédé de transmission ; et à un système de réception correspondant au procédé de réception. Afin de se conformer aux contraintes existantes relatives à la planification des fréquences, la présente invention combine la technologie de sauts de fréquence à un code d'entrelacement de canaux. L'invention est ainsi apte : à améliorer le gain en diversité des fréquences ; à accroître la capacité d'un système à résister à des trajets multiples dans des transmissions radio, ainsi qu'à un affaiblissement sélectif des fréquences ; et à renforcer la couverture effective d'un système de radiodiffusion.
PCT/CN2012/076807 2012-06-19 2012-06-19 Procédé pour une transmission de programmes de radiodiffusion multimédia numérique basée sur des sauts de fréquence, procédé pour une réception de programmes de radiodiffusion multimédia numérique basée sur des sauts de fréquence, et systèmes correspondants WO2013189007A1 (fr)

Priority Applications (1)

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PCT/CN2012/076807 WO2013189007A1 (fr) 2012-06-19 2012-06-19 Procédé pour une transmission de programmes de radiodiffusion multimédia numérique basée sur des sauts de fréquence, procédé pour une réception de programmes de radiodiffusion multimédia numérique basée sur des sauts de fréquence, et systèmes correspondants

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PCT/CN2012/076807 WO2013189007A1 (fr) 2012-06-19 2012-06-19 Procédé pour une transmission de programmes de radiodiffusion multimédia numérique basée sur des sauts de fréquence, procédé pour une réception de programmes de radiodiffusion multimédia numérique basée sur des sauts de fréquence, et systèmes correspondants

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1571512A (zh) * 2004-04-30 2005-01-26 清华大学 面向移动终端的多媒体广播系统及其实现方法
CN1604509A (zh) * 2004-10-29 2005-04-06 清华大学 多媒体信息传输中时频矩阵二维信道动态分配方法
WO2006066607A1 (fr) * 2004-12-22 2006-06-29 Telefonaktiebolaget Lm Ericsson (Publ) Transmission d'informations de diffusion numerique composites
CN101110666A (zh) * 2007-06-22 2008-01-23 北京创毅视讯科技有限公司 一种移动多媒体系统的数据发送方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1571512A (zh) * 2004-04-30 2005-01-26 清华大学 面向移动终端的多媒体广播系统及其实现方法
CN1604509A (zh) * 2004-10-29 2005-04-06 清华大学 多媒体信息传输中时频矩阵二维信道动态分配方法
WO2006066607A1 (fr) * 2004-12-22 2006-06-29 Telefonaktiebolaget Lm Ericsson (Publ) Transmission d'informations de diffusion numerique composites
CN101110666A (zh) * 2007-06-22 2008-01-23 北京创毅视讯科技有限公司 一种移动多媒体系统的数据发送方法

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