WO2015154396A1 - Système distribué et procédé de synchronisation de phase en boucle fermée se fondant sur une contre-réaction directionnelle - Google Patents

Système distribué et procédé de synchronisation de phase en boucle fermée se fondant sur une contre-réaction directionnelle Download PDF

Info

Publication number
WO2015154396A1
WO2015154396A1 PCT/CN2014/088104 CN2014088104W WO2015154396A1 WO 2015154396 A1 WO2015154396 A1 WO 2015154396A1 CN 2014088104 W CN2014088104 W CN 2014088104W WO 2015154396 A1 WO2015154396 A1 WO 2015154396A1
Authority
WO
WIPO (PCT)
Prior art keywords
time slot
phase
transmitter
threshold
disturbance
Prior art date
Application number
PCT/CN2014/088104
Other languages
English (en)
Chinese (zh)
Inventor
谢宁
陈永城
王晖
林晓辉
曾捷
Original Assignee
深圳大学
谢宁
陈永城
王晖
林晓辉
曾捷
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 深圳大学, 谢宁, 陈永城, 王晖, 林晓辉, 曾捷 filed Critical 深圳大学
Publication of WO2015154396A1 publication Critical patent/WO2015154396A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
    • H04L7/033—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop

Definitions

  • the invention belongs to the field of wireless communication technologies, and in particular relates to a distributed system and a closed-loop phase synchronization method based on directed negative feedback.
  • the single-bit feedback algorithm is a common technique for achieving transmitter phase synchronization at the receiving end.
  • the latest result of the algorithm is a hybrid single-bit feedback algorithm based on distributed beamforming technology, which uses the -1 bit information fed back from the receiver to perform a step disturbance ⁇ i for each transmitter at the transmitting end ( n) phase compensation feedback receiver and a continuous number C N "-1" when the bit information for a scale factor ⁇ i (n) attenuated ⁇ i (n), phase compensation can be timely adjustment of the transmitter.
  • the advantage of this technique is that the received signal strength can be rapidly increased by phase compensation, and the phase attenuation can cause the received signal strength to converge in a certain time slot.
  • the transmitter has different convergence speeds under different step sizes, and the convergence gain of the algorithm will be different under different feedback adjustment mechanisms. Therefore, the convergence speed and convergence ability of the existing algorithms have room for improvement. .
  • the first technical problem to be solved by the present invention is to provide a closed-loop phase synchronization method based on directional negative feedback for a distributed system, which aims to accelerate the convergence speed and convergence capability of the received signal strength of the receiver.
  • the present invention is implemented in a distributed system based on a closed-loop phase synchronization method with directed negative feedback, comprising the following steps performed in each time slot:
  • Step A The receiver determines whether the strength of the received signal in the current time slot is greater than or equal to the threshold of the next stage, and feeds back corresponding single-bit information to the transmitter according to the determination result;
  • Step B After the transmitter receives the single-bit information, it performs parsing. If the optimal direction of the disturbance step is not determined, and the analysis result is that the strength of the received signal of the receiver is greater than or equal to the threshold of the next stage, step C is performed, otherwise execution is performed. Step D; if the optimal direction of the disturbance step is determined, and the analysis result is that the strength of the received signal of the receiver is greater than or equal to the threshold of the next stage, step C is performed, otherwise step E is performed; the optimal direction of the disturbance step is When the received signal strength is less than the next-stage threshold, when the first received signal strength is greater than or equal to the next-stage threshold, the disturbance step direction of the previous time slot is the optimal direction of the disturbance step of all subsequent time slots;
  • Step C the best phase of the transmitter in the next time slot still takes its best phase in the current time slot, and does not generate a disturbance step in the next time slot, and directly adds the initial phase to the best phase of the next time slot in the next time slot. Transmitting a signal as a phase of transmission, and adding one to the number of stages; the initial phase is obtained by estimating, based on a signal received by the transmitter, the transmitter in the first time slot;
  • step D the disturbance step size of the next time slot is equal to the product of the direction of the disturbance step and the current step threshold step, and the optimal phase of the transmitter in the next time slot is the optimal phase of the current time slot plus the disturbance step of the next time slot.
  • the transmitter transmits the signal by using the best phase of the time slot below the next time slot plus the initial phase as the transmission phase; wherein the direction of the disturbance step is randomly generated by the transmitter;
  • step E the disturbance step size of the next time slot is equal to the product of the optimal direction of the disturbance step and the current phase threshold step, and the optimal phase of the transmitter in the next time slot is the optimal phase of the current time slot plus the next time slot. Disturb the step size and subtract the perturbation step size of the current time slot.
  • the transmitter transmits the signal at the optimum phase of a time slot below the next time slot plus the initial phase as the transmit phase.
  • a second technical problem to be solved by the present invention is to provide a distributed system including a plurality of transmitters and receivers.
  • the receiver is configured to determine, at each time slot, whether the strength of the received signal in the current time slot is greater than or equal to the next time. a threshold value, and feedback corresponding single-bit information to the transmitter according to the judgment result; the transmitter is configured to perform parsing after receiving the single-bit information;
  • the optimal direction of the disturbance step is not determined, and the result of the analysis is that the strength of the received signal of the receiver is greater than or equal to the threshold of the next stage, the optimal phase of the transmitter in the next time slot still takes the best phase in the current time slot, and No disturbance step is generated in the next time slot, and the optimum phase of the next time slot is added to the next time slot plus the initial phase as the transmission phase to transmit the signal, and the number of stages is increased by one; the initial phase is the transmitter in the first The time slot is estimated based on the signal received by the transmitter; otherwise, the perturbation step size of the transmitter in the next time slot is equal to the product of its disturbance step direction and the current phase threshold step size, and the best phase of the transmitter in the next time slot is current.
  • the optimal phase of the time slot is added to the disturbance step of the next time slot and the disturbance step size of the current time slot is subtracted, and the transmitter transmits the signal by adding the initial phase as the transmission phase to the optimum phase of the time slot below the next time slot;
  • the direction of the disturbance step is randomly generated by the transmitter; the optimal direction of the disturbance step is when the received signal strength is less than the threshold of the next stage. Disturbance step after the optimum direction after all slots situation, when first received signal strength is greater than or equal to the threshold value the next stage, the direction of the disturbance step is more than one time slot;
  • the optimal direction of the disturbance step is determined and the result of the analysis is that the strength of the received signal of the receiver is greater than or equal to the threshold of the next stage, the optimal phase of the transmitter in the next time slot still takes the best phase in the current time slot, and A time slot does not generate a disturbance step, and the signal is transmitted in the next time slot directly from the optimal phase of the next time slot plus the initial phase as the transmission phase, and the number of stages is incremented by one; the initial phase is when the transmitter is in the first time.
  • the slot is estimated based on the signal received by the transmitter; otherwise, the perturbation step size of the transmitter in the next slot is equal to the product of the optimal direction of its perturbation step and the current phase threshold step, and the best phase of the transmitter in the next slot is
  • the optimum phase of the current time slot is added to the disturbance step size of the next time slot and the disturbance step size of the current time slot is subtracted, and the transmitter transmits the signal by adding the initial phase as the transmission phase to the optimum phase of the time slot below the next time slot.
  • the stage threshold step size decreases as the number of stages increases.
  • the correspondence between the number of stages, the stage threshold step, and the stage threshold is as follows:
  • the invention has the following advantages:
  • the present invention proposes a step size disturbance selection mechanism: a stage threshold step selection mechanism.
  • a stage threshold step selection mechanism In the initial few time slots, large-step perturbations can be used to increase the received signal strength of the receiver. In the late time slots, small step disturbances can be used to obtain better stability even if the receiver signal strength converges to the ideal condition.
  • the direction of the original technique to the transmitter's disturbance step is random, and both the direction and the size are adjusted.
  • the present invention first determines the direction of the transmitter's disturbance step, and when the direction is determined, the adjustment of each transmitter is explained. The direction is correct, and only the disturbance step size is adjusted in the subsequent time slot, which can further accelerate the convergence of the subsequent received signal strength.
  • FIG. 1 is an architectural diagram of a distributed system provided by the present invention
  • FIG. 3 is a flow chart of feedback adjustment of a phase synchronization method provided by the present invention.
  • FIG. 5 is a flowchart of the RSS synchronization method in the phase synchronization method provided by the present invention being smaller than the current threshold.
  • the present invention proposes a step selection mechanism that employs different step sizes at different stages to accelerate convergence at different received signal strengths. And, The original technology compensates the phase compensation direction of the transmitter randomly, and adjusts the direction and the size. The present invention proposes a method for determining the direction of the transmitter compensation phase, and the direction determination can accelerate the convergence of the subsequent received signal strength. .
  • a plurality of transmitters simultaneously transmit signals to a receiver, and adjust the phase of the transmitted signal of the next time slot according to the single bit information fed back by the receiver, and finally pass the phase.
  • the manner of compensation synchronizes the phase of the respective received signals arriving at the receiver.
  • the transmitter receives the fed back single-bit information to determine whether to adjust the transmit signal phase.
  • the transmit phase formula for each transmitter is as follows:
  • ⁇ i ⁇ i + ⁇ i (n)+ ⁇ i ⁇ i , ⁇ i ⁇ [0,2 ⁇ ) (1)
  • ⁇ i represents the unknown phase offset of the ith transmitter
  • ⁇ i represents the phase response between the ith transmitter and the receiver, assuming that ⁇ i and ⁇ i are always static during the convergence of the algorithm, in accordance with The variable of [0, 2 ⁇ ) is evenly distributed and is unknown to both the transmitter and the receiver, both of which are collectively referred to as the initial phase C.
  • the best phase ⁇ i (n) is recorded in the memory, and at each time slot, a disturbance step ⁇ i (n) is compensated according to the single-bit information fed back by the receiver, ie
  • the optimal phase ⁇ i (n) is a function of ⁇ i (n), enabling the algorithm to achieve phase synchronization at the receiver end in a certain time slot.
  • the present invention introduces a new disturbance step generation method to achieve phase compensation for each transmitter, that is, the disturbance step size ⁇ i (n) is staged and large to small.
  • the disturbance step size ⁇ i (n) is generated by the phase threshold step g(k) in FIG. 2, and the direction is random.
  • the training process proceeds to the next phase k+1.
  • the current adjustments are useful to bring the phases between the transmitters closer together in a common direction.
  • phase threshold step is the size of the random disturbance added by the transmitter at different stages.
  • the phase threshold is determined by the maximum phase difference x(k) between the transmitters by the formula (4).
  • the value is at the receiver and the received signal.
  • the intensity R(n) is compared to determine if it should proceed to the next stage.
  • the two are mainly generated by the following two formulas:
  • phase threshold step g(k) of each phase can be generated, and the generation rule is:
  • the phase threshold step is half of the maximum phase difference. It can be seen that in the case where the transmitter phase variation range is [0, 2 ⁇ ), the transmitter phase difference is [0, ⁇ ). Obviously, the phase threshold step is half of the maximum phase difference for two purposes: It is possible to regularly reduce the phase difference between the transmitters. Second, the step size of the adjustment will be from large to small, the acceleration algorithm converges in the early stage, and the algorithm converges to the ideal situation in the later stage.
  • FIG. 3 illustrates the feedback adjustment mechanism between the transmitter and receiver of the present invention.
  • FIG. 5 illustrates the feedback adjustment mechanism between the transmitter and receiver of the present invention. Referring to FIG. 3 to FIG. 5 together.
  • the closed-loop phase synchronization method based on directed negative feedback of the distributed system provided by the present invention comprises the following steps:
  • Step A The receiver determines whether the strength of the received signal in the current time slot is greater than or equal to the threshold of the next stage, and feeds back corresponding single-bit information to the transmitter according to the determination result;
  • Step B The transmitter parses the single-bit information, and if the optimal direction of the disturbance step is not determined, and the analysis result is that the strength of the received signal of the receiver is greater than or equal to the threshold of the next stage, Step C is performed, otherwise step D is performed; if the optimal direction of the disturbance step is determined, and the result of the analysis is that the strength of the received signal of the receiver is greater than or equal to the threshold of the next stage, step C is performed, otherwise step E is performed;
  • the longest optimal direction is the case where the received signal strength is greater than or equal to the next stage threshold when the received signal strength is less than the next stage threshold.
  • the disturbance step direction of the previous time slot is the disturbance step of all subsequent time slots. Optimal direction
  • Step C the best phase of the transmitter in the next time slot still takes its best phase in the current time slot, and does not generate a disturbance step in the next time slot, and directly adds the initial phase to the best phase of the next time slot in the next time slot. Transmitting a signal as a phase of transmission, and adding one to the number of stages; the initial phase is obtained by estimating, based on a signal received by the transmitter, the transmitter in the first time slot;
  • step D the disturbance step size of the next time slot is equal to the product of the direction of the disturbance step and the current step threshold step, and the optimal phase of the transmitter in the next time slot is the optimal phase of the current time slot plus the disturbance step of the next time slot.
  • the transmitter transmits the signal by using the best phase of the time slot below the next time slot plus the initial phase as the transmission phase; wherein the direction of the disturbance step is randomly generated by the transmitter;
  • step E the disturbance step size of the next time slot is equal to the product of the optimal direction of the disturbance step and the current phase threshold step, and the optimal phase of the transmitter in the next time slot is the optimal phase of the current time slot plus the next time slot. Disturb the step size and subtract the perturbation step size of the current time slot.
  • the transmitter transmits the signal at the optimum phase of a time slot below the next time slot plus the initial phase as the transmit phase.
  • Steps C, D, and E correspond to the +1 module flow of FIG. 4 and the -1 module flow of FIG. 5, respectively.
  • the invention first adjusts the direction of the disturbance step ⁇ i (n). After determining its direction, the direction of phase compensation of each transmitter will not change, but at different stages, according to the feedback information of the receiver of each time slot, Adjust the size of the disturbance step to accelerate the effective combination of the transmitter phase at the receiver.
  • the transmitter receives the "-1" bit information for the first time, and the other is from the time slot n to the time slot n+1.
  • the first transition from “-1” to “+1” occurs, that is, the "n” receives "-1.
  • state_a controls the adjustment of state_b
  • state_b controls the direction variable Direct.
  • Direct adjusts the state of state_b only when the receiver feeds back negative bit information.
  • the Direct adjustment is as follows:
  • ⁇ i (n+1) Direct ⁇ g(k) R(n) ⁇ Th(k+1) (7)
  • the present invention can be applied to a wireless environment in which a plurality of wireless transmitting nodes transmit the same signal to a receiver, form a closed loop by the feedback adjustment mechanism of the present invention, and quickly converge the signal strength of the receiver under a complicated channel.

Landscapes

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

Abstract

La présente invention a trait au domaine technique des communications radio. L'invention concerne un système distribué et un procédé de synchronisation de phase en boucle fermée se fondant sur une contre-réaction directionnelle. Selon l'invention, une perturbation de grande taille d'étape est mise en oeuvre dans plusieurs créneaux temporels initiaux lorsqu'une intensité de signal reçu est inférieure à un seuil d'étage suivant, ce qui permet d'obtenir l'augmentation rapide de l'intensité du signal reçu par un récepteur ; une perturbation de petite taille d'étape est mise en oeuvre dans des créneaux temporels d'étage ultérieur lorsque l'intensité de signal reçu est inférieure à un seuil d'étage suivant, ce qui permet d'acquérir la stabilité des antériorités et permet de façon itérative à l'intensité de signal du récepteur de converger vers une situation idéale ; en outre, lorsque des réglages sont réalisés, la direction d'une taille d'étape de perturbation d'un émetteur est d'abord déterminée, puis, lorsque la direction est déterminée et qu'une direction de réglage pour chaque émetteur est avérée, seule l'ampleur de la taille d'étape de perturbation est réglée dans les créneaux temporels ultérieurs, ce qui permet d'accélérer encore la convergence d'intensités de signaux reçus ultérieurs.
PCT/CN2014/088104 2014-04-10 2014-10-05 Système distribué et procédé de synchronisation de phase en boucle fermée se fondant sur une contre-réaction directionnelle WO2015154396A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201410143719.0A CN103905178B (zh) 2014-04-10 2014-04-10 分布式系统及其基于定向负反馈的闭环式相位同步方法
CN201410143719.0 2014-04-10

Publications (1)

Publication Number Publication Date
WO2015154396A1 true WO2015154396A1 (fr) 2015-10-15

Family

ID=50996335

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2014/088104 WO2015154396A1 (fr) 2014-04-10 2014-10-05 Système distribué et procédé de synchronisation de phase en boucle fermée se fondant sur une contre-réaction directionnelle

Country Status (2)

Country Link
CN (1) CN103905178B (fr)
WO (1) WO2015154396A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103905178B (zh) * 2014-04-10 2017-01-25 深圳大学 分布式系统及其基于定向负反馈的闭环式相位同步方法
CN103944710B (zh) * 2014-04-10 2017-01-25 深圳大学 分布式系统及其基于连续负反馈的闭环式相位同步方法
CN105306190B (zh) * 2015-12-08 2018-04-03 深圳大学 基于累积正反馈的闭环式相位同步方法及分布式通信系统
WO2019006715A1 (fr) * 2017-07-05 2019-01-10 深圳大学 Procédé et appareil de formation de faisceau sécurisé et distribué basé sur un contrôle de rétroaction
CN110350964B (zh) * 2019-07-04 2022-04-26 佛山科学技术学院 一种基于概率约束的分布式波束成型方法及装置
CN112887010B (zh) * 2021-01-22 2022-07-19 中国人民解放军国防科技大学 一种星间链路信号级协同通信方法、装置和计算机设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004107597A1 (fr) * 2003-05-27 2004-12-09 Telefonaktiebolaget L M Ericsson (Publ) Calcul du profil de retard moyen dans une plage de retard limitee
US20100103917A1 (en) * 2008-09-08 2010-04-29 Donald Richard Brown System and Method for Synchronizing Phases and Frequencies of Devices in Multi-User, Wireless Communications Systems
CN103475460A (zh) * 2013-09-17 2013-12-25 北京邮电大学 分布式波束成形中的相位同步方法及系统
CN103905178A (zh) * 2014-04-10 2014-07-02 深圳大学 分布式系统及其基于定向负反馈的闭环式相位同步方法
CN103944710A (zh) * 2014-04-10 2014-07-23 深圳大学 分布式系统及其基于连续负反馈的闭环式相位同步方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101227242B (zh) * 2008-01-31 2011-06-01 西安交通大学 一种基于通道校正的分布式天线阵列波束形成方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004107597A1 (fr) * 2003-05-27 2004-12-09 Telefonaktiebolaget L M Ericsson (Publ) Calcul du profil de retard moyen dans une plage de retard limitee
US20100103917A1 (en) * 2008-09-08 2010-04-29 Donald Richard Brown System and Method for Synchronizing Phases and Frequencies of Devices in Multi-User, Wireless Communications Systems
CN103475460A (zh) * 2013-09-17 2013-12-25 北京邮电大学 分布式波束成形中的相位同步方法及系统
CN103905178A (zh) * 2014-04-10 2014-07-02 深圳大学 分布式系统及其基于定向负反馈的闭环式相位同步方法
CN103944710A (zh) * 2014-04-10 2014-07-23 深圳大学 分布式系统及其基于连续负反馈的闭环式相位同步方法

Also Published As

Publication number Publication date
CN103905178A (zh) 2014-07-02
CN103905178B (zh) 2017-01-25

Similar Documents

Publication Publication Date Title
WO2015154396A1 (fr) Système distribué et procédé de synchronisation de phase en boucle fermée se fondant sur une contre-réaction directionnelle
WO2015154395A1 (fr) Système réparti et son procédé de synchronisation de phase en boucle fermée faisant appel à une rétroaction négative continue
US8135100B2 (en) Adaptive clock and equalization control systems and methods for data receivers in communications systems
US5268930A (en) Decision feedback equalizer
US8891601B2 (en) Apparatus and method for start-up in communication system
US11516053B2 (en) Method and device for channel equalization, and computer-readable medium
JP5553844B2 (ja) Ｍｉｍｏシステムにおける出力制御のためのシステム及び方法
CN105306190B (zh) 基于累积正反馈的闭环式相位同步方法及分布式通信系统
JP2004529577A5 (fr)
US8654830B1 (en) Systems, circuits and methods for adapting parameters of a linear equalizer in a receiver
CA2937064C (fr) Appareil et procede de compensation de distorsion de reseau multi-canal
US8416846B1 (en) Systems, circuits and methods for adapting taps of a decision feedback equalizer in a receiver
TW201735609A (zh) 用於設定類比前端ｄｃ增益之系統及方法
JP2011199864A (ja) メッシュ無線ネットワークのノードを同期させるための方法及びデバイス
CN102316568B (zh) 闭环功率控制处理方法及基站
US20130241643A1 (en) Systems and methods for adaptive equalization control for high-speed wireline communications
EP2045930B1 (fr) Contrôle électrique C/I décentralisé pour TDD
CN111294911B (zh) 用于多节点直放站的发射功率的确定方法及装置、存储介质、终端
CN102006100A (zh) 通讯系统中的传收器及其启动方法
US20050054362A1 (en) Method and apparatus for transmit power control during a group call to a plurality of devices
Hu et al. Minimum transmission delay via spectrum sensing in cognitive radio networks
US11336489B1 (en) Method of configuring decision feedback equalizer and related decision feedback equalizer thereof
Yang et al. A novel one-bit feedback collaborative beamforming algorithm using two time slots
US11350406B2 (en) Remote radio unit for processing uplink transmission and downlink transmission through time division scheme in cloud RAN environment, and operating method thereof
WO2017031759A1 (fr) Procédé et dispositif permettant d'indiquer une période de signal synchrone

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14889017

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 14889017

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 14889017

Country of ref document: EP

Kind code of ref document: A1