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WO2001013595A1 - Procede d'estimation de canal dans un systeme de communication radio selon lequel des sequences de mesure de canal sont formees par derivation cyclique de sequences de base - Google Patents

Procede d'estimation de canal dans un systeme de communication radio selon lequel des sequences de mesure de canal sont formees par derivation cyclique de sequences de base Download PDF

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Publication number
WO2001013595A1
WO2001013595A1 PCT/DE2000/002689 DE0002689W WO0113595A1 WO 2001013595 A1 WO2001013595 A1 WO 2001013595A1 DE 0002689 W DE0002689 W DE 0002689W WO 0113595 A1 WO0113595 A1 WO 0113595A1
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WO
WIPO (PCT)
Prior art keywords
channel
sequences
channel measurement
radio
measurement sequences
Prior art date
Application number
PCT/DE2000/002689
Other languages
German (de)
English (en)
Inventor
Thomas Ulrich
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2001013595A1 publication Critical patent/WO2001013595A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation

Definitions

  • the invention relates to a method for channel estimation in a radio communication system, in particular a radio communication system with TD / CDMA subscriber separation.
  • radio communication systems for example the second generation European mobile radio system GSM (Global System for Mobile Communications)
  • GSM Global System for Mobile Communications
  • the radio interface relates to a connection between a base station and a multiplicity of subscriber stations, for example mobile stations or stationary terminals.
  • the electromagnetic waves are emitted at carrier frequencies that lie in a frequency band provided for the respective system.
  • UMTS Universal Mobile Telecommunication System
  • 3rd generation systems frequencies in the frequency band of approx. 2000 MHz are provided.
  • the emitted electromagnetic waves are attenuated due to losses due to reflection, diffraction and the like. As a result, the reception power that is available at the receiving radio station decreases. This damping is location-dependent and also time-dependent for moving radio stations. In the case of multipath propagation, several signal components arrive at the receiving radio station with different delays. The influences described describe the connection-specific transmission channel. From DE 197 34 936 it is known how a channel estimation based on the evaluation of transmitted and previously known channel measurement sequences in the receiver improves the properties of the connection duel transmission channel determined. This is done by comparing the previously known stored Kanalmeß ⁇ sequence and the received distorted by the transmission channel channel measurement sequence. The result of the channel estimation is a channel impulse response.
  • the invention has for its object to provide a method for channel estimation, which allows greater flexibility and improved network planning. This object is achieved by the method according to claim 1. Advantageous developments of the invention can be found in the subclaims.
  • the amount of channel measurement sequences is expanded by using the time-inverse channel measurement sequences.
  • the time inversions of the channel measurement sequences have the same properties as the original channel measurement sequences and can be derived from them in a simple manner.
  • Another advantage is that the amount of available channel measurement sequences is doubled without the need for additional signaling or storage of channel measurement sequences.
  • the advantages can be achieved by simply redefining the use of the channel measurement sequences.
  • the set of channel measurement sequences is formed by cyclically deriving one or more basic sequences. This in turn decreases the signaling and storage effort and zusharm ⁇ Lich is a simultaneous joint channel estimation for a plurality of transmission channels possible if the Kanalmeß ⁇ sequences from the same basic sequence were derived.
  • the derivation rule is designed in such a way that, depending on the transmission conditions of the radio interface, 4, 8 or 16 channel measurement sequences are derived from a basic sequence by the cyclical derivation, there is increased flexibility in the design of the radio interface.
  • complicated transmission conditions e.g. Long delay times and multipath propagation
  • only a few, but longer, channel measurement sequences are derived, however, with good transmission conditions, a larger number of channel measurement sequences.
  • the number of channel measurement sequences thus also determines the data rate or number of connections to which the channel measurement sequences are assigned.
  • only the non-inverse channel measurement sequences or their basic sequence are stored at the receiving end.
  • two processes are then carried out with the channel measurement sequence and with the inverse of the channel measurement sequence formed in the receiver. These processes can be carried out in parallel or sequentially.
  • a particularly large number of different channel measurement sequences are required in a channel with optional multiple access (random access).
  • FIG. 1 shows a block diagram of a radio communication system
  • FIG. 2 shows a schematic representation of the frame structure of the radio interface
  • FIG. 3 shows the use of a channel with optional multiple access.
  • a mobile radio system consists in each case of a multiplicity of mobile switching centers MSC, which belong to a switching network (SSS - Switchmg Subsystem) and are networked with one another or provide access to a fixed network, and one or more base station systems BSS connected to these mobile switching centers MSC (BSS - Base Station Subsystem).
  • a base station system BSS in turn has at least one device RNC (RNC - Radio Network Controller) for allocating radio resources and at least one base station NB (NB - Node B) connected to it.
  • RNC Radio Network Controller
  • a base station NB can establish connections to mobile stations UE (UE - User Equipment) via a radio interface. At least one radio cell Z is formed by each base station NB. The size of the radio cell is generally determined by the range of an organization channel (BCCH - Broadcast Control Channel), which is transmitted by the base stations NB with a maximum and constant transmission power.
  • BCCH - Broadcast Control Channel an organization channel
  • FIG. 1 shows a mobile station UE at a speed V m of the radio cell of the Z Basissta ⁇ tion NB moved.
  • the mobile station UE has set up a connection to the base station NB, on which a signal transmission of a selected service takes place in the upward UL and downward direction DL.
  • the mobile stations UE and base stations NB periodically evaluate the transmission properties of the radio interface by channel estimation according to DE 197 34 936.
  • a broadband frequency range m is divided into a plurality of time slots ts of the same duration, for example 15 time slots ts0 to tsl4, which form a time frame fr.
  • a time slot ts is allocated for a channel R ⁇ CH with optional multiple access.
  • a frequency band B extends over a certain frequency range. Some of the time slots are used for signal transmission in the downward direction DL and some of the time slots in the upward direction UL. An asymmetry ratio of 3: 1 in favor of the downward direction DL is shown as an example.
  • the frequency band B for the upward direction UL corresponds to the frequency band B for the downward direction DL. The same is repeated for other carrier frequencies. Due to the variable allocation of the time slots ts for upward or downward direction UL, DL, diverse asymmetrical resource allocations can be made. Information of several connections is transmitted in radio blocks within the time slots ts.
  • the data d are spread individually with a fine structure, a spread code c, so that, for example, n connections can be separated at the receiving end by this CDMA component (code division multiple access).
  • the spreading of individual Symbo ⁇ len d causes the data that ym within the symbol duration 1 S Q chips are transferred to the duration T p ⁇ cr ⁇ .
  • the Q chips form the connection-specific spreading code c.
  • Chip rate 3.84 Mcps frame duration: 10 ms
  • both channel measurement sequences m which are derived from a non-inverted basic sequence mO
  • channel measurement sequences mi which are derived from an inverted basic sequence miO
  • the channel measurement sequences are used as midambles to coordinate the receiver during data connection for data detection.
  • the channel measurement sequences m, mi consist of chips that have the same duration as the chips of the spread data in order to facilitate the evaluation at the receiving end.
  • the Inver ⁇ orientation is m a time reversal of the order of the chips. The first chip will be the last, the second will be the penultimate, etc
  • the basic sequences mO, miO can be extended periodically, so that 16, 8 or 4 different channel measurement sequences can be derived by simply moving and appending 1/16, 1/8 or 1/4 of the basic sequence mO, miO.
  • 3 shows a channel R ⁇ CH m Aufwarts ⁇ chtung UL, which is divided into eight subchannels by way of example by different transmission times. Furthermore, 16 channel measurement sequences ml..m8 and m ⁇ l..m ⁇ 8 can be used in each subchannel, so that there are 8 x 16 collision groups within the channel. If the subdivision is omitted, there are still 16 collision groups.
  • a mobile station UE can arbitrarily transmit a radio block in the R ⁇ CH channel under 128 possibilities, i.e. without prior assignment, so that a collision with a transmission from another mobile station UE that was faced with the same choice is unlikely.
  • 3 shows by means of hatched areas the channel measurement sequences m, mi currently used in the R ⁇ CH channel.
  • the throughput in the R ⁇ CH channel is increased and also the delay time until a transmission is successfully received, since fewer collisions occur on average.
  • the transmissions of the mobile stations UE in the R ⁇ CH channel include the channel measurement sequence m, mi and additionally symbols, for example at least 122, with which the mobile station UE can signal a reference number, the purpose of the access and possibly further information. Only the basic sequence O and an instruction for forming the channel measurement sequences m, need be stored in the transmitter and receiver, the inverse miO and also the derivatives mi can then be generated quickly if required. This also reduces the signaling effort, because within a radio cell, the radio stations UE, NB involved must first be informed of the permissible channel sequences m, mi.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé d'estimation de canal, selon lequel la quantité des séquences de mesure de canal est augmentée par exploitation des séquences de mesure de canal temporellement inversées. Les séquences de mesure de canal ont les mêmes caractéristiques que celles des séquences de mesure de canal originelles et sont dérivées de façon simple de celles-ci. Un autre avantage réside dans le fait que le doublement de la quantité de séquences de mesure de canal disponibles est obtenu sans qu'il soit nécessaire d'avoir une signalisation complémentaire ou une mémorisation de séquences de mesure de canal complémentaires. Ces avantages peuvent être obtenus par une rédéfinition simple de l'exploitation des séquences de mesure de canal.
PCT/DE2000/002689 1999-08-16 2000-08-10 Procede d'estimation de canal dans un systeme de communication radio selon lequel des sequences de mesure de canal sont formees par derivation cyclique de sequences de base WO2001013595A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19938747.8 1999-08-16
DE1999138747 DE19938747A1 (de) 1999-08-16 1999-08-16 Verfahren zur Kanalschätzung in einem Funk-Kommunikationssystem

Publications (1)

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WO2001013595A1 true WO2001013595A1 (fr) 2001-02-22

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DE (1) DE19938747A1 (fr)
WO (1) WO2001013595A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7797425B2 (en) 2005-12-22 2010-09-14 Amdocs Systems Limited Method, system and apparatus for communications circuit design
US7965796B2 (en) 2002-02-27 2011-06-21 Freescale Semiconductor, Inc. Channel estimation in a radio receiver
CN103795659A (zh) * 2012-10-30 2014-05-14 领特德国有限公司 信道估计

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10204454B4 (de) * 2002-02-04 2004-10-07 Siemens Ag Verfahren zur Aufrechterhaltung einer paketorientierten Datenverbindung in einem Funk-Kommunikationssystem

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0456625A1 (fr) * 1990-05-10 1991-11-13 Telefonaktiebolaget L M Ericsson Procédé de transmission de commandes différentes pour choisir l'émetteur-antenne dans un système de communication radio à multiplexage temporel
DE4212300A1 (de) * 1992-04-11 1993-10-14 Paul Walter Prof Dr Ing Baier Verfahren und Einrichtung zum gleichzeitigen Schätzen von Kanälen bei der digitalen Nachrichtenübertragung in Vielfachzugriffssystemen
EP0802656A2 (fr) * 1996-04-19 1997-10-22 Wavecom Signal numérique à blocs de référence multiples pour l'estimation de canal, procédés d'estimation de canal et récepteurs correspondants
WO1999020061A2 (fr) * 1997-10-14 1999-04-22 Siemens Aktiengesellschaft Procede et dispositif de reception pour l'estimation de canaux dans des systemes de telecommunication

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6921930U (de) * 1969-05-27 1969-09-11 Gruenzweig & Hartmann Aus flechtwerk bestehender behaelter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0456625A1 (fr) * 1990-05-10 1991-11-13 Telefonaktiebolaget L M Ericsson Procédé de transmission de commandes différentes pour choisir l'émetteur-antenne dans un système de communication radio à multiplexage temporel
DE4212300A1 (de) * 1992-04-11 1993-10-14 Paul Walter Prof Dr Ing Baier Verfahren und Einrichtung zum gleichzeitigen Schätzen von Kanälen bei der digitalen Nachrichtenübertragung in Vielfachzugriffssystemen
EP0802656A2 (fr) * 1996-04-19 1997-10-22 Wavecom Signal numérique à blocs de référence multiples pour l'estimation de canal, procédés d'estimation de canal et récepteurs correspondants
WO1999020061A2 (fr) * 1997-10-14 1999-04-22 Siemens Aktiengesellschaft Procede et dispositif de reception pour l'estimation de canaux dans des systemes de telecommunication

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7965796B2 (en) 2002-02-27 2011-06-21 Freescale Semiconductor, Inc. Channel estimation in a radio receiver
US7797425B2 (en) 2005-12-22 2010-09-14 Amdocs Systems Limited Method, system and apparatus for communications circuit design
CN103795659A (zh) * 2012-10-30 2014-05-14 领特德国有限公司 信道估计
US9584181B2 (en) 2012-10-30 2017-02-28 Lantiq Deutschland Gmbh Channel estimation
US10116350B2 (en) 2012-10-30 2018-10-30 Lantiq Deutschland Gmbh Channel estimation

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DE19938747A1 (de) 2001-03-22

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