WO2003081835A1 - Procede de reception a auto-adaptation de la diversite de transmission spatio-temporelle ponderee et systeme associe - Google Patents

Procede de reception a auto-adaptation de la diversite de transmission spatio-temporelle ponderee et systeme associe Download PDF

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Publication number
WO2003081835A1
WO2003081835A1 PCT/CN2002/000191 CN0200191W WO03081835A1 WO 2003081835 A1 WO2003081835 A1 WO 2003081835A1 CN 0200191 W CN0200191 W CN 0200191W WO 03081835 A1 WO03081835 A1 WO 03081835A1
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WO
WIPO (PCT)
Prior art keywords
module
linear transformation
receiver
space
receiving
Prior art date
Application number
PCT/CN2002/000191
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English (en)
Chinese (zh)
Inventor
Aijun Cao
Original Assignee
Huawei Technologies Co., Ltd.
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 Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to PCT/CN2002/000191 priority Critical patent/WO2003081835A1/fr
Priority to AU2002249061A priority patent/AU2002249061A1/en
Priority to CN02125258.0A priority patent/CN1190092C/zh
Publication of WO2003081835A1 publication Critical patent/WO2003081835A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding

Definitions

  • the present invention relates to space-time transmit diversity reception technology, and more particularly, to a receiving method and system based on adaptive weighted space-time transmit diversity.
  • WCDMA wideband code division multiple access
  • 3G third generation
  • the receiver After receiving these independent copies, the receiver usually makes full use of the redundancy of information according to the principle of Maximum Likelihood (ML) By processing the characteristics, the bit error rate of transmitted information can be greatly reduced, and the energy required for wireless data transmission is reduced, thereby reducing mutual interference between users. It can be seen that the diversity technology can effectively increase the system capacity.
  • ML Maximum Likelihood
  • the Diversity technique is to first perform simple space-time coding on the information to be transmitted, and then divide the space-time-coded signal into two channels and send them to The two independent transmitting channels perform transmission.
  • the receiving end receives signals from the two independent transmitting channels and processes them according to the maximum likelihood principle.
  • the ordinary STTD transmission diversity technology cannot reach the upper performance limit.
  • reference numeral 100 represents information to be transmitted, where S ⁇ .
  • S 2 is two transmission symbols in the same space-time coding block; 101 is a space-time coding module, 102 is a feedback signal processing module, 103 is an optimal weight calculation module, 104 is a feedback channel, and 105 is a transmission power distribution module.
  • 106 is a transmitting antenna array with two antennas, which means that two independent transmitting channels are transmitted through the antennas Antl and Ant2 respectively;
  • Rec is a receiver based on the maximum likelihood (ML) principle at the receiving end, and
  • 107 is a maximum likelihood Receiving module.
  • the diversity method includes at least the following steps: a.
  • the transmitting end uses the two input symbols as a unit block to perform space-time coding according to a certain rule and outputs two signals;
  • the transmitting end adjusts the current transmitting power values of the two transmitting antennas in real time respectively according to the currently given transmitting power weight value, while keeping the total transmitting power unchanged; the transmitting antenna array will pass through the air according to the current transmitting power value.
  • Time-coded output signal is transmitted from two independent antennas;
  • the receiver at the receiving end estimates the fading characteristics of the two wireless channels based on the currently received signal, and feeds back the fading amplitude characteristics of the two wireless channels to the transmitting end after encoding;
  • the transmitting end receives and obtains the characteristic information of the fading amplitude of the current two wireless channels from the feedback channel, calculates a new adaptive weight value of the transmission power of the two transmission channels according to formula (1), and adjusts the transmission power according to the weight value.
  • the received signal of the same space-time coding block can be expressed as Among them, ⁇ and r 2 are the received signals of the same space-time coding block, respectively! ⁇ And h 2 represent the fading factors of the wireless channel from the two transmitting antennas to the receiving antenna, 5, and S 2 are the transmission symbols in the same space-time coding block, and S is the receiving noise, w. w 2 is the transmit power weight of the two transmit channels at the transmitting end.
  • the receiver mainly performs functions such as maximum likelihood reception and decoding, and the S, S 2 decision variables calculated by the maximum likelihood reception technology are directly used for decoding.
  • the decisions of S, S 2 The variables are:
  • VV 2 -A As the signal energy increases, the interference of this cross term will become larger and larger, which seriously affects the performance of the receiver.
  • the main object of the present invention is to provide a method for receiving adaptively weighted space-time transmit diversity, which can further improve the reception processing of adaptively weighted space-time diversity, and avoid the result of increasing the adaptive weighting operation. Signal interference to improve system performance.
  • Another object of the present invention is to provide a system for implementing an adaptive weighted space-time transmit diversity reception method, which can improve the performance of a receiver in an adaptive weighted space-time transmit diversity system, thereby improving the overall performance of the system, and
  • the design is simple and easy to implement.
  • a method for receiving adaptively weighted space-time transmit diversity includes at least:
  • the receiver After receiving the signal from the transmitting end, the receiver first uses the maximum likelihood principle to calculate the intermediate value of the decision variable for each signal;
  • the intermediate value of the decision variable is calculated according to the given linear transformation matrix and its coefficients, and the final decision variable value of each signal is calculated by linear transformation, and this value is used as the input of the subsequent processing module.
  • step a further includes: the receiver detects the received input signal in units of space-time coded blocks, and outputs two intermediate values of decision variables each time.
  • Step b further includes: setting a linear transformation matrix in advance, and calculating a linear transformation matrix coefficient in advance.
  • the linear transformation matrix coefficient is related to the implementation form of adaptive weighted space-time transmit diversity, and can be determined by the adaptive weight value and the fading amplitude characteristic of the wireless channel.
  • Step b further includes: sending the final decision variable value to a decoding module in the receiver for decoding processing.
  • a system for implementing the above-mentioned adaptive weighted space-time transmit diversity receiving method includes at least a space-time coding module, a transmission antenna array with two antennas, a transmission power distribution module, a feedback channel, a feedback signal processing module, and an optimal weight calculation module.
  • the maximum likelihood receiving module in the receiving end receiver, the key is: the receiving end receiver further includes a linear transformation module;
  • the receiver's maximum likelihood receiver module receives and processes the signal from the transmitting end, outputs the intermediate value of the decision variable to the linear transformation module for linear transformation, and the processed decision variable continues to be sent to the subsequent processing module of the receiver.
  • the subsequent processing module at least Including decoding module.
  • the key of the present invention is: adding line-to-line conversion processing at the receiving end based on adaptive weighted space-time transmit diversity to remove the interference between signals generated during the calculation of the transmission power weight and improve system performance.
  • the present invention adds a level of simplicity based on the information about the fading amplitude of the wireless channel obtained by the receiver itself and the optimal weight calculation method based on the space-time coding adaptive weighted closed-loop transmit diversity technology.
  • the linear transform (LT, Linear Transform) removes the cross terms in the adaptive weight calculation through the linear transform process, thereby avoiding the signal interference generated by the cross terms, and greatly improving the reception performance of the transmit diversity; and the linear transform and The use of adaptive weighted transmit diversity technology based on space-time coding can greatly improve the overall performance of the system.
  • the present invention only needs to add a linear conversion module to the receiver at the receiving end, and the system of the existing technology is slightly changed, the system performance is further improved on the original basis, and the structure design is simple and easy to implement.
  • FIG. 1 is a schematic structural diagram of a conventional adaptive weighted space-time transmit diversity system
  • FIG. 2 is a schematic diagram of a system composition structure of adaptive weighted space-time transmit diversity according to the present invention
  • FIG. 3 is a schematic diagram of performance comparison of the present invention with existing space-time transmit diversity and existing adaptive weighted space-time transmit diversity. Mode for Carrying Out the Invention The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
  • FIG. 2 is a schematic structural diagram of a system of space-time transmit diversity according to the present invention.
  • the system includes a space-time coding module 101, a feedback signal processing module 102, an optimal weight calculation module 103, a feedback channel 104, and a transmission power allocation.
  • the module 105, the transmitting antenna array 106 with two antennas, and the maximum likelihood receiving module 107 in the receiving end receiver, especially after the maximum likelihood receiving module 107 in the receiving end receiver further include: a linear transformation module 108 .
  • the feedback channel 104 is used to output information about the current wireless channel characteristics from the receiver;
  • the feedback signal processing module 102 is used to receive information about the current wireless channel characteristics from the feedback channel and perform mapping processing; an optimal weight calculation module 103.
  • the transmit power allocation module 105 is used to adjust the transmit power values of different antennas based on the received transmit power weights.
  • the antenna array 106 uses two independent antennas to output the coded output of the space-time coding module 101 according to the current transmission power value. Submit.
  • the linear transformation module 108 is configured to receive the output of the maximum likelihood receiving module 107, calculate a linear transformation matrix coefficient based on the adaptive weight calculation method, and use the matrix to linearly transform the input.
  • a maximum likelihood receiving module 107 first detects a received input signal from a transmitting end by using a space-time coding block as a unit, following a normal maximum likelihood principle.
  • each signal after space-time coding contains a copy of the information, but the form and sequence are different.
  • the space-time coding block actually refers to two copies of the information of the two signals. Therefore, the receiver Receive two signals at the same time, use the two copies of the information to perform joint processing according to formula (4), and output the intermediate value of the two decision variables each time to the linear transformation module 108.
  • the intermediate value of the decision variable can be expressed as:
  • coefficients A and B can also be expressed in other forms or determined by other factors, which mainly depend on the different implementation forms of adaptive weighted space-time transmit diversity.
  • the linear transformation module 108 can calculate the linear transformation matrix coefficients A and B represented by the formula (5), and then according to the formula (6) '
  • the average signal-to-noise ratio SNR corresponding to the decision variable can be obtained as:
  • ⁇ can be calculated according to formula (7), and the present invention has an average increase of 1.55dB compared with the performance of ordinary STTD transmit diversity, and an average increase of 0.7 ⁇ 0.8dB compared with the increase of adaptive weighted ST D transmit diversity performance.
  • FIG. 3 is a schematic diagram showing the performance comparison between the present invention and the existing space-time transmit diversity and the existing adaptive weighted space-time transmit diversity, where the abscissa represents the number of decibels (dB) of the signal-to-noise ratio (Eb / No), and the ordinate Represents the original bit error rate, curve 31 is the performance curve of ordinary STTD transmit diversity, curve 32 is the performance curve of STTD transmit diversity after increasing adaptive weighted adjustment of transmit power, curve 33 is the performance of STTD transmit diversity after linear transformation processing is added according to the present invention curve.
  • the abscissa represents the number of decibels (dB) of the signal-to-noise ratio (Eb / No)
  • the ordinate Represents the original bit error rate
  • curve 31 is the performance curve of ordinary STTD transmit diversity
  • curve 32 is the performance curve of STTD transmit diversity after increasing adaptive weighted adjustment of transmit power
  • curve 33 is the performance of STTD transmit diversity after linear transformation processing is added according to the present invention
  • the present invention is not only applicable to the aforementioned adaptive weighted space-time transmit diversity method and structure proposed by the applicant, but also applicable to various other adaptive weighted space-time transmit diversity techniques implemented through different approaches.
  • the concepts of the present invention are applicable, except that for different implementations of various adaptive weighted space-time transmit diversity technologies, the corresponding linear transformation coefficients will be different.

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

Abstract

Procédé de réception permettant l'auto-adaptation de la diversité de transmission spatio-temporelle pondérée, qui comporte au moins les étapes suivantes : (A) après avoir reçu les signaux en provenance du terminal d'émission, le récepteur utilise le principe de la vraisemblance maximale pour calculer une valeur intermédiaire de variable attribuée aux signaux dans chaque sens, (B) ensuite, la valeur intermédiaire de variable attribuée est soumise à une transformation linéaire pour le calcul de la valeur de variable aléatoire finale des signaux dans chaque sens, selon la matrice assignée d'une transformation linéaire et son coefficient, et ladite valeur pourrait être utilisée en tant qu'entrée pour un traitement ultérieur. La présente invention concerne également un système permettant de mettre en oeuvre ledit procédé. Les procédés et les architectures selon la présente invention peuvent améliorer la performance du récepteur qui repose sur le système d'auto-adaptation de la diversité de transmission spatio-temporelle. En outre, ils éliminent les interférences de signaux et améliorent la performance du système dans son ensemble.
PCT/CN2002/000191 2002-03-22 2002-03-22 Procede de reception a auto-adaptation de la diversite de transmission spatio-temporelle ponderee et systeme associe WO2003081835A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/CN2002/000191 WO2003081835A1 (fr) 2002-03-22 2002-03-22 Procede de reception a auto-adaptation de la diversite de transmission spatio-temporelle ponderee et systeme associe
AU2002249061A AU2002249061A1 (en) 2002-03-22 2002-03-22 A self-adapting weighted space time transmitting diversity receiving method and system thereof
CN02125258.0A CN1190092C (zh) 2002-03-22 2002-07-19 一种自适应加权空时发射分集的接收方法及其系统

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2002/000191 WO2003081835A1 (fr) 2002-03-22 2002-03-22 Procede de reception a auto-adaptation de la diversite de transmission spatio-temporelle ponderee et systeme associe

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0999658A2 (fr) * 1998-11-06 2000-05-10 Lucent Technologies Inc. Diversité d'espace et temps pour des systèmes sans fil
EP1028556A2 (fr) * 1999-02-12 2000-08-16 Texas Instruments Incorporated Diversité d'espace et temps pour WCDMA
CN1288294A (zh) * 1999-09-13 2001-03-21 朗迅科技公司 应用空间时间扩展以及正交发射分集技术的接收机结构

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0999658A2 (fr) * 1998-11-06 2000-05-10 Lucent Technologies Inc. Diversité d'espace et temps pour des systèmes sans fil
EP1028556A2 (fr) * 1999-02-12 2000-08-16 Texas Instruments Incorporated Diversité d'espace et temps pour WCDMA
CN1288294A (zh) * 1999-09-13 2001-03-21 朗迅科技公司 应用空间时间扩展以及正交发射分集技术的接收机结构

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