WO2001037442A1 - Procede de transmission de signal dans un systeme de communication radio - Google Patents

Procede de transmission de signal dans un systeme de communication radio Download PDF

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Publication number
WO2001037442A1
WO2001037442A1 PCT/DE2000/004062 DE0004062W WO0137442A1 WO 2001037442 A1 WO2001037442 A1 WO 2001037442A1 DE 0004062 W DE0004062 W DE 0004062W WO 0137442 A1 WO0137442 A1 WO 0137442A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
subscriber station
radio
subscriber
channel
Prior art date
Application number
PCT/DE2000/004062
Other languages
German (de)
English (en)
Inventor
Jörg GUSTRAU
Andreas Höynck
Marcus Purat
Anja Klein
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
Priority to AU23502/01A priority Critical patent/AU2350201A/en
Publication of WO2001037442A1 publication Critical patent/WO2001037442A1/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
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/7103—Interference-related aspects the interference being multiple access interference
    • H04B1/7105—Joint detection techniques, e.g. linear detectors
    • 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
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • 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
    • H04L25/0212—Channel estimation of impulse response
    • 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
    • H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
    • 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
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03343—Arrangements at the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
    • H04L5/1484—Two-way operation using the same type of signal, i.e. duplex using time-sharing operating bytewise
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70701—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation featuring pilot assisted reception

Definitions

  • the invention relates to a method for signal transmission and a base station and a subscriber station of a radio communication system, in particular a mobile radio system, for carrying out the method according to the invention.
  • information such as, for example, voice, picture information or other data
  • a radio interface between a transmitting and a receiving mobile station, such as a base station or a mobile station for the case of one Mobile radio system.
  • the electromagnetic waves are emitted at carrier frequencies that lie in the frequency band intended for the respective system.
  • the carrier frequencies are in the range of 900 MHz, 1800 MHz and 1900 MHz.
  • Carrier frequencies in the range of approx. 2000 MHz are provided for future mobile radio systems with CDMA and TD / CDMA transmission methods via the radio interface, such as the UMTS (Universal Mobile Telecommunication System) or other 3rd generation systems.
  • UMTS Universal Mobile Telecommunication System
  • the TDD mode is particularly distinguished by the fact that a common frequency band is used both for signal transmission in the upward direction (UL - Uplmk) and in the downward direction (DL - Downlmk), while the FDD mode for the transmission directions uses a respective frequency band uses.
  • the signals m of the base station are predistorted in such a way that the subscriber station experiences ideal channel properties.
  • ISI - Inter Symbol Interference the so-called intersymbol interference
  • MAI - Multiple Access Interference the interference caused by multiple access
  • JP Joint Detection
  • MRF multi-fmger rake receiver
  • SRF single rake finger
  • this method can only be used up to a certain maximum speed - assuming a maximum of 40 km / h - of the subscriber station, since at higher speeds the channel properties m the time interval between the signal transmission in the upward direction and the downward direction or between several sig- nal transmissions can change greatly in the upward direction.
  • the JP-process is switched off and the subscriber station following the reception of the data by means of a Jomt Detection or more -Fmger rake receiver performs.
  • the use of or not the JP method must be signaled to the subscriber station by the base station via higher transmission layers in accordance with the standardized ISO-OSI layer model.
  • the invention is based on the object of specifying a method, a base station and a subscriber station of a radio communication system which enable efficient use of the described Jomt predistortion method. This object is achieved by the method, the base station and by the subscriber station in accordance with the features of the independent claims. Further developments of the invention can be found in the subclaims.
  • Erfmdungsgeclar is based on a radio communication system, which uses a TD / CDMA subscriber and the radio interface is ized in accordance with a TDD method orga ⁇ , from a base station carried out a channel estimation of m uplink direction from a subscriber station transmitted signals.
  • the base station then carries out a predistortion of data and a training sequence of a radio block to be transmitted in the downward direction to the subscriber station.
  • the receiving station selects a receiving method suitable for receiving the data.
  • the implementation according to the invention advantageously enables the subscriber station to make an independent decision about the reception algorithm to be used on the basis of the channel impulse response determined, without this having to be signaled to it via higher transmission layers, as in the prior art described. This ensures a consistently high transmission quality.
  • the autonomous decision-making ability is based on knowledge of the training sequence, which is predistorted by the base station m in the same way as the data of the radio block, whereas in the prior art only predistortion of the data was provided, and from which the subscriber station performed an m of the base station Can detect predistortion.
  • the channel pulse response is determined from the received training sequence.
  • an undistorted training sequence appears at the receiving device of the subscriber station.
  • the subsequent correlation of this undistorted training sequence with the ideal training sequence leads to a channel impulse response corresponding to a delta impulse. If the subscriber station recognizes that the real transmission channel has such an impulse response, it can advantageously receive the data of the radio block, for example by means of an Ein-Fmger rake receiver.
  • this type of receiver enables a lower energy consumption of the subscriber station due to a lower computational complexity compared to a Jomt detection or multi-finger rake receiver, which leads to an advantageous extension of the operating time, particularly in the case of mobile subscriber stations.
  • the subscriber station recognizes that the channel impulse response determined does not correspond to a delta impulse, for example if the base station does not carry out predistortion, or if it does so, the training sequence appears distorted at the receiving device, then the Jomt Detection or Multi-Fmger rake receiver selected to receive the data.
  • the base station carries out predistortion, for example in accordance with the Jo t predistortion method described in the introduction, depending on a determined variation in the channel properties.
  • the properties which change from time frame to time frame are determined by a respective channel estimate of the upward direction of the signals sent by the subscriber station.
  • the Jomt predistortion method is advantageously carried out by the base station if, for example, several successive channel estimates have shown that the subscriber station (s) have a respective time slot
  • the transfer properties for the upward direction can be used to determine the transfer properties for the downward direction.
  • tion can be closed. There is a reciprocity between the two directions of transmission.
  • the training sequence known to the subscriber station and the unknown data are distorted in the same way in order to compensate for the real channel impulse response.
  • the quasi series connection of a predistortion and a distorting real transmission channel results in an ideal transmission system.
  • FIG. 1 shows a block diagram of a radio communication system, in particular a mobile radio system
  • FIG. 2 shows an exemplary schematic representation of the frame structure of the radio interface and the structure of a radio block
  • FIG. 3 shows a block diagram of a transmission device
  • FIG. 4 shows a block diagram of a receiving device
  • FIG. 5 shows a flowchart of the method according to the invention.
  • Each mobile radio system consists of a large number of mobile switching centers MSC (Mobile Switchmg Center), which belong to a switching network (Switchmg Subsystem) and are networked with one another or provide access to a fixed network PSTN, and each with one or more Mobile switching centers MSC connected base station systems i ⁇ s B ⁇ S (Base Station Subsystem).
  • Em base station system BSS in turn comprises at least one RNC to (Radio Network C ontroller) for allocating radio resources as well as at least one respectively associated base station NB (Node B).
  • RNC Radio Network C ontroller
  • a base station NB can establish and maintain connections to subscriber stations 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 Z is generally determined by the range of an organization channel (BCCH - Broadcast Control Channel), which is transmitted by the base stations NB with a respectively higher and constant transmission power. In the case of sectorization or hierarchical cell structures, a plurality of radio cells Z can also be supplied per base station NB.
  • BCCH - Broadcast Control Channel an organization channel
  • a plurality of radio cells Z can also be supplied per base station NB.
  • FIG. 1 shows a subscriber station UE which is located in the radio cell Z of a base station NB and moves at a speed V.
  • the subscriber station UE has set up a communication link to the base station NB, on which a selected service is transmitted in the upward UL and downward direction DL.
  • the communication connection is separated by one or more spreading codes assigned to the subscriber station UE from communication connections established in parallel in the radio cell Z, the subscriber station UE, for example, all spreading codes currently assigned in each case to the radio cell Z for receiving the signals of the own communication connection in accordance with the known jo t Detection method uses.
  • FIG 2 An exemplary frame structure of the radio interface as it is in the TDD mode of the future mobile radio system of the third generation UMTS (Universal Mobile Telecommunications System) as well as a modified form of the future Chinese TD-SCDMA mobile radio system is shown in FIG 2.
  • the successive time slots ts are structured according to a frame structure. In this way, 16 time slots ts0 to tsl5 are combined to form a time frame fr. Several subsequent time frames for result in a multiple frame.
  • part of the time slots tsO to tsl5 in the upward direction UL and part of the time slots tsO to tsl5 in the downward direction DL are used, the transmission in the upward direction UL taking place, for example, before the transmission in the downward direction DL.
  • a changeover point SP SP - Switch Point
  • SP SP - Switch Point 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 m radio blocks fb are transmitted within the time slots ts.
  • the data d are spread individually for each connection with a fem structure, a spreading code c, so that on the receiving side a number of connections can be separated by this CDMA component (code division multiple access).
  • a transmission channel is defined which can be used for the transmission of signaling and useful information.
  • the spread of em- causing individual symbols of the data d in that the duration T p c ⁇ be transferred within the Sym ⁇ bold except T sym Q chips.
  • connection-specific spreading code c The connection-specific training sequence tseql ... is also arranged in the radio blocks fb and is used for channel estimation at the receiving end. Furthermore, a protection time gp is provided within the time slot ts to compensate for different signal tents of the connections of successive time slots ts.
  • the examples described below to explain the method according to the invention are not limited to the radio interface structure shown by way of example in accordance with FIG. 2.
  • the method can advantageously the aforementioned Chinese TD-SCDMA mobile radio system (Time Division Synchronized Code Division Multiple Access), in which the signal transmission in the upward direction UL is synchronized, and its structure of the radio interface a few points from the explained TDD mode UMTS systems deviate, can be realized.
  • TD-SCDMA mobile radio system Time Division Synchronized Code Division Multiple Access
  • a transmitter structure according to FIG. 3 is used in a CDMA transmission method.
  • K data streams are to be transmitted via the radio interface.
  • Channel coding, scrambling (mterleavmg), modulation and spreading (spreadmg) of the data are carried out.
  • the spreading is carried out with individual spreading codes cl..cK, which allow a distinction to be made between subscriber signals within the signal mixture.
  • the individual subscriber signals are then summed up and formed with the sum signal in a radio block.
  • the radio block formation relates primarily to a transmission system with "burst start" transmission.
  • the data of a time slot are compiled within the radio block formation. Thereupon the signal becomes one Filtered chip pulse filter and m D / A converter m em converted analog signal, which can be amplified and radiated via antennas AT.
  • the corresponding structure of a receiving device can be seen from FIG. 4.
  • the received signal is sampled and A / D converted so that the received signal can be fed to a digital low-pass filter.
  • the digitized signal is now fed in parallel to a channel estimator KS and a detection device DE. It is assumed for the following consideration that the received signal is in the form of a received matrix e, where
  • A describes a system matrix
  • d specifies the data to be detected in m matrix form
  • n is a matrix containing the noise component.
  • KS channel estimator
  • the system matrix A is set up with the aid of the channel impulse responses.
  • the system matrix A contains values related to the individual channel impulse response words, which are also referred to as a combined channel impulse response.
  • the combined channel impulse response is created by folding the spreading code c with the associated channel impulse response individually for each subscriber signal.
  • a system matrix A is also used mathematically.
  • the m Kanalim ⁇ impulse responses only certain corresponding fingers of the rake receiver's considered paths. This can also be generalized to multi-user detection based on the rake receiver.
  • the structure of the transmitting and receiving device can be implemented in the same way in the subscriber stations UE, only one data stream branch being taken into account.
  • FIG. 5 shows an example of a sequence diagram to explain the method according to the invention.
  • the subscriber station UE sends radio blocks fb in accordance with the assigned time slot ts within a time frame for signal transmission.
  • the radio blocks fb consist of data d and at least one training sequence tseq. This training sequence tseq is used in the base station NB for channel estimation, the channel estimation for
  • the base station NB can determine a variation in the transmission properties, the transmission properties m generally changing depending on the speed V of the subscriber station UE, or drawing conclusions about a specific speed V of the subscriber station UE from a change in the properties can be.
  • the base station NB determines that the transmission properties change only slightly, ie the subscriber station UE only moves at a low speed V or does not move at all, then it leads for the signal transmission in the downward direction.
  • device DL to the subscriber station UE by predistortion in accordance with a Jomt predistortion method JP.
  • JP Jomt predistortion method
  • the decision as to whether a predistortion is carried out or not can be made, for example, by comparing the determined variation of the transmission properties with a specific threshold value, with exceeding the threshold value for switching off or falling below the threshold value for switching on the Jo t-Predi stortion procedure JP leads.
  • switching off the JP method from a certain variation is not a condition for the advantageous effect of the method. For example, switching off can only take place when the base station NB determines that an incorrectly predistorted channel has a more unfavorable effect than the non-predistorted channel on the reception quality of the subscriber station UE.
  • the a priori known training sequence tseq m the radio blocks fb is used for channel estimation in the same way. If the Jomt predistortion method JP is carried out for the two transmission directions UL, DL of the base station NB on the basis of a determined reciprocity of the transmission properties, the undistorted training sequence tseq appears on the receiving device of the subscriber station UE, since the predistortion was calculated in this way using the JP method that the channel impulse response becomes a delta pulse. Is this the If so, an so-called ideal channel is assumed and an Em-Fmger rake receiver SRF with the known advantages is used for the detection of the data d of the radio block fb.
  • the subscriber station UE concludes that a multi-F ger rake receiver MRF or an Jomt detection receiver JD is required for receiving the data d. This can also be the case if the JP method is still carried out by the base station NB, but due to an increased speed V or transmission disturbances there are nevertheless distortions and there is no longer an ideal channel. If the channel impulse response subsequently approaches a delta impulse, the subscriber station UE uses an Em-Fmger rake receiver SRF as described.

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

Abstract

Selon l'invention, une station de base effectue une estimation de canal de signaux envoyés en amont par une station abonné, au moyen d'un système de communication radio utilisant un procédé de séparation d'abonnés TD/CDMA, dont l'interface est organisée selon un procédé DRT. Ensuite, la station de base effectue une prédistorsion de données et d'une séquence de formation d'un bloc radio devant être envoyé en aval vers la station d'abonné. La station d'abonné sélectionne un procédé de réception adapté à la réception des parties de données, en fonction d'une réponse d'impulsion de canal de la séquence de formation connue.
PCT/DE2000/004062 1999-11-17 2000-11-16 Procede de transmission de signal dans un systeme de communication radio WO2001037442A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU23502/01A AU2350201A (en) 1999-11-17 2000-11-16 Method for signal transmission in a radio communication system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19955357.2 1999-11-17
DE1999155357 DE19955357C2 (de) 1999-11-17 1999-11-17 Verfahren zur Signalübertragung in einem Funk-Kommunikationssystem und Teilnehmerstation

Publications (1)

Publication Number Publication Date
WO2001037442A1 true WO2001037442A1 (fr) 2001-05-25

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PCT/DE2000/004062 WO2001037442A1 (fr) 1999-11-17 2000-11-16 Procede de transmission de signal dans un systeme de communication radio

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AU (1) AU2350201A (fr)
DE (1) DE19955357C2 (fr)
WO (1) WO2001037442A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003036810A1 (fr) * 2001-09-28 2003-05-01 Siemens Aktiengesellschaft Dispositif et procede permettant d'egaliser des signaux de reception
EP1503554A1 (fr) * 2003-07-28 2005-02-02 Siemens Aktiengesellschaft Procédé de préfiltrage d'une séquence d'apprentissage dans un système de communication radio

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10340397A1 (de) * 2003-09-02 2005-04-07 Siemens Ag §erfahren zum Übertragen von Signalen in einem Funkkommunikationssystem sowie entsprechende Sendestation und Empfangsstation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0415502A2 (fr) * 1989-09-01 1991-03-06 Philips Electronics Uk Limited Système de communications
US5872814A (en) * 1997-02-24 1999-02-16 At&T Wireless Services Inc. Method for linearization of RF transmission electronics using baseband pre-distortion in T/R compensation pilot signals

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19724027C2 (de) * 1997-06-06 1999-09-30 Siemens Ag Verfahren und Anordnung zum Empfang von Daten
DE19749389A1 (de) * 1997-11-07 1999-05-20 Siemens Ag Verfahren, Empfangseinrichtung und Mobilstation zur Datenübertragung in einem Funk-Kommunikationssystem

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0415502A2 (fr) * 1989-09-01 1991-03-06 Philips Electronics Uk Limited Système de communications
US5872814A (en) * 1997-02-24 1999-02-16 At&T Wireless Services Inc. Method for linearization of RF transmission electronics using baseband pre-distortion in T/R compensation pilot signals

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003036810A1 (fr) * 2001-09-28 2003-05-01 Siemens Aktiengesellschaft Dispositif et procede permettant d'egaliser des signaux de reception
EP1503554A1 (fr) * 2003-07-28 2005-02-02 Siemens Aktiengesellschaft Procédé de préfiltrage d'une séquence d'apprentissage dans un système de communication radio
WO2005013574A1 (fr) * 2003-07-28 2005-02-10 Siemens Aktiengesellschaft Procede de prefiltrage de sequences d'apprentissage dans un systeme de radiocommunication
US7697602B2 (en) 2003-07-28 2010-04-13 Nokia Siemens Networks Gmbh & Co. Kg Method for pre-filtering training sequences in a radiocommunication system

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Publication number Publication date
DE19955357C2 (de) 2001-11-29
AU2350201A (en) 2001-05-30
DE19955357A1 (de) 2001-08-09

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