WO2017096537A1 - 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 - Google Patents

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 Download PDF

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WO2017096537A1
WO2017096537A1 PCT/CN2015/096734 CN2015096734W WO2017096537A1 WO 2017096537 A1 WO2017096537 A1 WO 2017096537A1 CN 2015096734 W CN2015096734 W CN 2015096734W WO 2017096537 A1 WO2017096537 A1 WO 2017096537A1
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time slot
source node
signal
received
nth
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谢宁
徐凯
陈敬坤
王晖
林晓辉
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深圳大学
谢宁
徐凯
陈敬坤
王晖
林晓辉
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Publication of WO2017096537A1 publication Critical patent/WO2017096537A1/zh

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    • 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
    • H04B1/7163—Spread spectrum techniques using impulse radio
    • H04B1/7183—Synchronisation

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  • the present invention relates to the field of distributed communication technologies, and in particular, to a closed-loop phase synchronization method based on cumulative positive feedback and a distributed communication system.
  • the distributed beamforming technology is a cooperative communication technology, in which multiple source nodes jointly transmit information so that they can be effectively merged at the target node to achieve communication range, transmission rate, and energy efficiency. In order to achieve the above advantages, it is necessary to implement synchronization of carriers.
  • the existing carrier synchronization algorithms are divided into two categories: one is a closed-loop carrier synchronization algorithm, and the target node measures whether the received signal strength meets the system requirements, and continuously feeds the measurement result back to the source node, and the source node realizes carrier synchronization, wherein the source There is very little communication between nodes.
  • the other type is an open-loop carrier synchronization algorithm that synchronizes through communication between source nodes, and there is little communication between the target node and the source node.
  • the existing closed-loop carrier synchronization algorithms include the single-bit positive feedback iterative algorithm proposed by Raghuraman Mudumbai, Joao Hespanha, Upamanyu Madhow, Gwen Barriac, and the single-bit positive feedback iterative algorithm by Shuo Song, John S. Thompson, Pei-Jung Chung and Peter M. Grant. Based on the proposed hybrid feedback carrier synchronization algorithm.
  • the single-bit positive feedback iterative algorithm adds a random perturbation to the transmit phase of the source node in each time slot, and determines whether to retain the random perturbation according to the information fed back by the target node.
  • the algorithm can achieve phase alignment of the target node almost perfectly without using the channel state information, and the convergence time of the algorithm only increases linearly with the number of participating nodes.
  • the basic principle of the algorithm can be easily applied to the algorithm.
  • the actual environment can be extended to achieve frequency synchronization issues.
  • the algorithm only utilizes the single-bit positive feedback information of the target node and does not utilize the negative feedback information, so the advantage of single-bit feedback is not fully utilized.
  • the hybrid negative feedback carrier synchronization algorithm further utilizes the information of the positive and negative aspects of the feedback of the target node, improves the speed of phase synchronization, and introduces a continuous negative feedback time slot counter to reduce the disturbance step when the counter reaches a threshold. Long, so that the signal strength received by the target node is further increased.
  • the algorithm also has certain problems. For example, the selection of the iteration step has certain limitations. In the initial stage of convergence, the large step size cannot be fully utilized to speed up the convergence.
  • the technical problem to be solved by the present invention is to provide a closed-loop phase synchronization method and a distributed communication system based on cumulative positive feedback to improve the convergence speed in the initial stage of convergence in the phase synchronization process.
  • the present invention is implemented as follows:
  • a closed-loop phase synchronization method based on cumulative positive feedback includes the following steps:
  • Step A Each source node simultaneously transmits a signal to the target node at the respective transmission phase ⁇ i (1) in the first time slot; the target node detects the total strength R(1) of the signal received in the first time slot, and uses it as The best received signal strength R best (2) of the second time slot, and then enters the second time slot; ⁇ i (1) is the transmission phase of the i-th source node in the first time slot;
  • a distributed communication system includes a target node and a plurality of source nodes
  • Each source node simultaneously transmits a signal to the target node at the respective transmission phase ⁇ i (1) in the first time slot; the target node detects the total signal strength R(1) received in the first time slot, and uses it as the second time. The best received signal strength R best (2) of the slot, and then enters the second time slot; ⁇ i (1) is the transmit phase of the ith source node in the first time slot;
  • Each source node simultaneously transmits a signal to the target node at the respective transmission phase ⁇ i (2) in the second time slot;
  • ⁇ i (2) ⁇ i (1) + ⁇ i (2), ⁇ i (2) is the first The transmission phase of the i source node in the second time slot, ⁇ i (2) is the random phase perturbation of the i-th source node in the second time slot;
  • the present invention introduces a positive feedback counter to accumulate the number of times that the total strength of the signal received by the target node in the current time slot is greater than the optimal received signal strength of the current time slot, and when the number of times reaches a preset threshold, The step size of the random phase disturbance is automatically increased in the next time slot, so that the convergence speed in the early convergence period is improved.
  • Figure 1 Schematic diagram of the composition of a distributed communication system provided by the present invention
  • FIG. 2 is a schematic flow chart of a closed-loop phase synchronization method based on cumulative positive feedback of the distributed communication system.
  • FIG. 1 is a schematic diagram of a composition of a distributed communication system including a plurality of source nodes 2 and a target node 1.
  • the closed-loop phase synchronization method based on cumulative positive feedback of the system is shown in FIG. 2, and includes the following steps:
  • Step A Each source node 2 simultaneously transmits a signal to the target node 1 at the respective transmission phase ⁇ i (1) in the first time slot, and the target node 1 detects the total strength R(1) of the signal received in the first time slot, and This is taken as the optimum received signal strength R best (2) of the second time slot, and then enters the second time slot.
  • ⁇ i (1) is the transmission phase of the ith source node 2 in the first time slot
  • ⁇ i (1) may be the initial phase of the transmission signal of each source node 2 may be different.
  • ⁇ i (2) is the transmission phase of the i-th source node 2 in the second slot
  • ⁇ i (2) is the random phase perturbation of the i-th source node 2 in the second slot.
  • the target node 1 detects the total strength R(2) of the signal received in the second time slot, and determines whether R(2) is greater than the best received signal strength R best (2) of the second time slot, and if so, sends positive feedback.
  • the target node 1 detects the total strength R(n) of the signal received in the nth time slot, and determines whether R(n)>R best (n), and R best (n) is the best received signal of the nth time slot.
  • Step C is a continuous step, that is, starting from the third time slot, after completing the third time slot, the phase iterative process of the fourth, fifth, sixth, n, n+1 time slots is sequentially performed. Through continuous phase iteration, the transmit phase of each source node 2 will be finally synchronized, so that the received signal strength of the target node 1 is maximized.
  • the number of positive feedback signals received by each source node 2 ie, the total strength of the signal received by the target node 1 is greater than the optimal received signal strength of the time slot
  • the first Threshold ie, the number of positive feedback signals received by each source node 2
  • ⁇ i (n+1) ⁇ i (n) ⁇ 1 , ⁇ 1 >1, at the same time, clear the positive feedback counter and re-accumulate, and increase the first threshold
  • the positive feedback counter counts the number of times the positive feedback signal is received, and when the number reaches the first threshold, the step size of the phase disturbance is automatically increased in the next time slot, and the value of the first threshold is increased, thereby improving convergence.
  • the initial convergence speed is the step size of the phase disturbance is automatically increased in the next time slot, and the value of the first threshold is increased, thereby improving convergence.
  • each source node 2 starts from the second time slot, and also accumulates the number of times that the negative feedback signal is continuously received by the negative feedback counter.
  • each source node 2 receives a negative feedback signal (ie, the total strength of the signal received by the target node 1 is not greater than
  • ⁇ i (n+1) ⁇ i (n) ⁇ 2 , 0 ⁇ 2 ⁇ 1 at the next time slot, and the positive and negative feedback counters are cleared.
  • ⁇ i (n+1) ⁇ i (n) ⁇ 2 , 0 ⁇ 2 ⁇ 1 at the next time slot, and the positive and negative feedback counters are cleared.
  • zero and re-accumulate, and reduce the second threshold by a second fixed value, that is, reduce the next second threshold of the negative feedback counter, otherwise, at the next time slot, let ⁇ i (n+1) ⁇ i (n ). That is, the negative feedback counter counts the number of times the negative feedback signal is continuously received.
  • the step size of the phase disturbance is automatically reduced in the next time slot, and the value of the second threshold is decreased, thereby improving the convergence period. convergence speed.

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Abstract

本发明涉及分布式通信技术领域，尤其涉及一种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。本发明从第2时隙开始，通过正反馈计数器累加目标节点接收到的信号总强度大于当前时隙的最佳接收信号强度的次数，当该次数达到预设值时，就在下一时隙时自动增大相位扰动的步长，并增大该预设值的值，从而提高收敛初期的收敛速度。

Description

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 技术领域
本发明涉及分布式通信技术领域，尤其涉及一种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。
背景技术
分布式波束成型技术是一种协同通信技术，由多个源节点协同地发送信息，使其在目标节点能够有效合并，实现通信范围、传输速率、能量效率的增长。为了实现上述优势，需要实现载波的同步。
现有的载波同步算法分为两大类：一类是闭环载波同步算法，目标节点测量接收信号强度是否满足系统要求，不断将测量结果反馈给源节点，源节点以此实现载波同步，其中源节点间很少通信。另一类是开环载波同步算法，通过源节点之间的通信实现同步，而目标节点与源节点之间很少通信。
现有的闭环载波同步算法包括RaghuramanMudumbai，Joao Hespanha，UpamanyuMadhow，Gwen Barriac提出的单比特正反馈迭代算法以及Shuo Song，John S.Thompson，Pei-Jung Chung和Peter M.Grant在单比特正反馈迭代算法的基础上提出的混合负反馈载波同步算法。
单比特正反馈迭代算法在每个时隙内对源节点的发射相位增加一个随机的扰动，根据目标节点反馈的信息决定是否保留该随机扰动。该算法能够在不利用信道状态信息的前提下，近乎完美地在目标节点实现相位的对齐，并且该算法的收敛时间只是随着参与节点的个数线性增长，算法的基本原理可以轻易的运用于实际环境并且能够扩展到实现频率同步问题上。但该算法只利用了目标节点的单比特正反馈信息，并没有利用负反馈信息，因此没有充分利用单比特反馈的优势。
混合负反馈载波同步算法进一步地利用了目标节点反馈的正负两个方面的信息，提高了相位同步的速度，并且引入了连续负反馈时隙计数器，在计数器达到一个门限值时缩小扰动步长，使得目标节点接收到的信号强度进一步提高。然而，该算法也存在一定问题，比如迭代步长的选取有一定限制，在收敛的初始阶段，并不能充分利用大步长加快收敛速度。
发明内容
本发明所要解决的技术问题是，提供一种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，以提高相位同步过程中收敛初期的收敛速度。本发明是这样实现的：
一种基于累积正反馈的闭环式相位同步方法，包括如下步骤：
步骤A：各源节点在第1时隙以各自的发射相位θi(1)同时向目标节点发射信号；目标节点检测第1时隙接收到的信号总强度R(1)，并将其作为第2时隙的最佳接收信号强度Rbest(2)，然后进入第2时隙；θi(1)为第i源节点在第1时隙的发射相位；
步骤B：各源节点在第2时隙以各自的发射相位θi(2)同时向目标节点发射信号；θi(2)＝θi(1)+δi(2)，θi(2)为第i源节点在第2时隙的发射相位，δi(2)为第i源节点在第2时隙的随机相位扰动；目标节点检测第2时隙接收到的信号总强度R(2)，并判断R(2)是否大于第2时隙的最佳接收信号强度Rbest(2)，如果是，则发送正反馈信号给各源节点，且设第3时隙的最佳接收信号强度Rbest(3)＝R(2)，否则，发送负反馈信号给各源节点，且设Rbest(3)＝Rbest(2)；然后进入第3时隙；
步骤C：各源节点在第n时隙以各自的发射相位θi(n)同时向目标节点发射信号，θi(n)＝θi(n-1)+δi(n)+ξi(n)；n为自然数，且n≥3，θi(n)为第i源节点在第n时隙的发射相位，δi(n)为第i源节点在第n时隙的随机相位扰动，ξi(n)为第n时隙的相位扰动调整值；当各源节点接收到的上一时隙目标节点发送的信号为正反 馈信号时，ξi(n)＝0，当各源节点接收到的上一时隙目标节点发送的信号为负反馈信号时，ξi(n)＝-δi(n)；同时，目标节点检测第n时隙接收到的信号总强度R(n)，并判断是否R(n)＞Rbest(n)，Rbest(n)为第n时隙的最佳接收信号强度，如果R(n)＞Rbest(n)，则发送正反馈信号给各源节点，且设Rbest(n+1)＝R(n)，否则，发送负反馈信号给各源节点，且设Rbest(n+1)＝Rbest(n)；然后进入第n+1时隙；
从第2时隙开始，各源节点通过正反馈计数器累加接收到正反馈信号的次数，如果在第n时隙时该次数未达到预设的第一阈值，则使δi(n+1)＝δi(n)；如果在第n时隙时该次数达到预设的第一阈值，则使δi(n+1)＝δi(n)×α1，α1＞1，同时，将正反馈计数器清零并重新累加，并将第一阈值增大第一固定值。
进一步地，从第2时隙开始，各源节点通过负反馈计数器累加连续接收到负反馈信号的次数，在负反馈计数器累加次数的过程中，一旦发生正反馈，则负反馈计数清零，并重新累加；如果在第n时隙时该次数未达到预设的第二阈值，则使δi(n+1)＝δi(n)；如果在第n时隙时该次数达到预设的第二阈值，则使δi(n+1)＝δi(n)×α2，0＜α2＜1，同时，将正、负反馈计数器清零并重新累加，并将第二阈值减小第一固定值。
一种分布式通信系统，包括目标节点和若干源节点；
各源节点在第1时隙以各自的发射相位θi(1)同时向目标节点发射信号；目标节点检测第1时隙接收到的信号总强度R(1)，并将其作为第2时隙的最佳接收信号强度Rbest(2)，然后进入第2时隙；θi(1)为第i源节点在第1时隙的发射相位；
各源节点在第2时隙以各自的发射相位θi(2)同时向目标节点发射信号；θi(2)＝θi(1)+δi(2)，θi(2)为第i源节点在第2时隙的发射相位，δi(2)为第i源节点在第2时隙的随机相位扰动；目标节点检测第2时隙接收到的信号总强度R(2)，并判断R(2)是否大于第2时隙的最佳接收信号强度Rbest(2)，如果是，则发送正反馈信号给各源节点，且设第3时隙的最佳接收信号强度Rbest(3)＝R(2)，否则，发送负反馈信号给各源节点，且设Rbest(3)＝Rbest(2)；然后进入第3时隙；
各源节点在第n时隙以各自的发射相位θi(n)同时向目标节点发射信号，θi(n)＝θi(n-1)+δi(n)+ξi(n)；n为自然数，且n≥3，θi(n)为第i源节点在第n时隙的发射相位，δi(n)为第i源节点在第n时隙的随机相位扰动，ξi(n)为第n时隙的相位扰动调整值；当各源节点接收到的上一时隙目标节点发送的信号为正反馈信号时，ξi(n)＝0，当各源节点接收到的上一时隙目标节点发送的信号为负反馈信号时，ξi(n)＝-δi(n)；同时，目标节点检测第n时隙接收到的信号总强度R(n)，并判断是否R(n)＞Rbest(n)，Rbest(n)为第n时隙的最佳接收信号强度，如果R(n)＞Rbest(n)，则发送正反馈信号给各源节点，且设Rbest(n+1)＝R(n)，否则，发送负反馈信号给各源节点，且设Rbest(n+1)＝Rbest(n)；然后进入第n+1时隙；
从第2时隙开始，各源节点通过正反馈计数器累加接收到正反馈信号的次数，如果在第n时隙时该次数未达到预设的第一阈值，则使δi(n+1)＝δi(n)；如果在第n时隙时该次数达到预设的第一阈值，则使δi(n+1)＝δi(n)×α1，α1＞1，同时，将正反馈计数器清零并重新累加，并将第一阈值增大第一固定值。
进一步地，从第2时隙开始，各源节点通过负反馈计数器累加连续接收到负反馈信号的次数，在负反馈计数器累加次数的过程中，一旦发生正反馈，则负反馈计数清零，并重新累加；如果在第n时隙时该次数未达到预设的第二阈值，则使δi(n+1)＝δi(n)；如果在第n时隙时该次数达到预设的第二阈值，则使δi(n+1)＝δi(n)×α2，0＜α2＜1，同时，将正、负反馈计数器清零并重新累加，并将第二阈值减小第一固定值。
与现有技术相比，本发明引入正反馈计数器累积目标节点在当前时隙接收到的信号总强度大于当前时隙的最佳接收信号强度的次数，当次数达到预设的阈值时，便会在下一时隙时自动增大随机相位扰动的步长，从而使得收敛前期的收敛速度得到提高。
附图说明
图1：本发明提供的分布式通信系统组成示意图；
图2：所述分布式通信系统的基于累积正反馈的闭环式相位同步方法流程示意图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。
如图1所示为分布式通信系统的组成示意图，该系统包括若干源节点2以及目标节点1。该系统的基于累积正反馈的闭环式相位同步方法如图2所示，包括如下步骤：
步骤A：各源节点2在第1时隙以各自的发射相位θi(1)同时向目标节点1发射信号，目标节点1检测第1时隙接收到的信号总强度R(1)，并将其作为第2时隙的最佳接收信号强度Rbest(2)，然后进入第2时隙。θi(1)为第i源节点2在第1时隙的发射相位，θi(1)可为各源节点2的发射信号的初始相位，各源节点2的初始相位可能是不同的。
步骤B：各源节点2在第2时隙以各自的发射相位θi(2)同时向目标节点1发射信号，θi(2)＝θi(1)+δi(2)。θi(2)为第i源节点2在第2时隙的发射相位，δi(2)为第i源节点2在第2时隙的随机相位扰动。目标节点1检测第2时隙接收到的信号总强度R(2)，并判断R(2)是否大于第2时隙的最佳接收信号强度Rbest(2)，如果是，则发送正反馈信号给各源节点2，且设第3时隙的最佳接收信号强度Rbest(3)＝R(2)，否则，发送负反馈信号给各源节点2，且设Rbest(3)＝Rbest(2)；然后进入第3时隙。
步骤C：各源节点2在第n时隙以各自的发射相位θi(n)同时向目标节点1发射信号，θi(n)＝θi(n-1)+δi(n)+ξi(n)，n为自然数，且n≥3，θi(n)为第i源节点2在第n时隙的发射相位，δi(n)为第i源节点2在第n时隙的随机相位扰动，ξi(n)为 第n时隙的相位扰动调整值。当各源节点2接收到的上一时隙目标节点1发送的信号为正反馈信号时，表明上一时隙加入的相位扰动使得各源节点2的相位更接近同步，目标节点1接收到的信号强度进一步增强了，则各源节点2在当前时隙发射信号时需要继续加入该相位扰动，因此，设ξi(n)＝0；而当各源节点2接收到的上一时隙目标节点1发送的信号为负反馈信号时，表明上一时隙加入的相位扰动未使得各源节点2的相位更接近同步，目标节点1接收到的信号强度未进一步增强，则各源节点2在当前时隙发射信号时不需要继续加入该相位扰动，因此，设ξi(n)＝-δi(n)。同时，目标节点1检测第n时隙接收到的信号总强度R(n)，并判断是否R(n)＞Rbest(n)，Rbest(n)为第n时隙的最佳接收信号强度，如果R(n)＞Rbest(n)，则发送正反馈信号给各源节点2，并将该信号强度R(n)作为下一时隙的最佳接收信号强度，即Rbest(n+1)＝R(n)，否则，发送负反馈信号给各源节点2，并将第n时隙的最佳接收信号强度Rbest(n)继续作为第n+1时隙的最佳接收信号强度，即Rbest(n+1)＝Rbest(n)。完成第n时隙后，进入第n+1时隙。步骤C是一个持续的步骤，即从第3时隙开始，完成第3时隙后，再依次进行第4、5、6、、、n、n+1时隙的相位迭代过程。通过不断的相位迭代，各源节点2的发射相位将最终同步，从而使得目标节点1的接收信号强度达到最强。
从第2时隙开始，就会同时有当前时隙接收到的信号总强度与当前时隙的最佳接收信号强度。各源节点2从第2时隙开始，通过正反馈计数器累加接收到正反馈信号的次数，如果在第n时隙时该次数未达到预设的第一阈值，则使δi(n+1)＝δi(n)；如果在第n时隙时该次数达到预设的第一阈值，则使δi(n+1)＝δi(n)×α1，α1＞1，同时，将正反馈计数器清零并重新累加，并将第一阈值增大第一固定值。即是说，如果截至当前时隙时，各源节点2接收到的正反馈信号(即目标节点1接收到的信号总强度大于当时时隙的最佳接收信号强度)的个数累积达到第一阈值，则在下一时隙时，使δi(n+1)＝δi(n)×α1，α1＞1，同时，将正反馈计数器清零并重新累加，并将第一阈值增大第一固定值，即增大正反 馈计数器下一次的第一阈值，否则，在下一时隙时，使δi(n+1)＝δi(n)。即正反馈计数器统计累积接收到正反馈信号的次数，当该次数达到第一阈值时，就在下一时隙时自动增大相位扰动的步长，并增大该第一阈值的值，从而提高收敛初期的收敛速度。
同样地，各源节点2从第2时隙开始，还通过负反馈计数器累加连续接收到负反馈信号的次数，在负反馈计数器累加次数的过程中，一旦发生正反馈，则负反馈计数清零，并重新累加。如果在第n时隙时该次数未达到预设的第二阈值，则使δi(n+1)＝δi(n)；如果在第n时隙时该次数达到预设的第二阈值，则使δi(n+1)＝δi(n)×α2，0＜α2＜1，同时，将正、负反馈计数器清零并重新累加，并将第二阈值减小第一固定值。即是说，如果截至当前时隙时，在之前连续的第二阈值个时隙中，各源节点2接收到的都是负反馈信号(即目标节点1接收到的信号总强度都不大于当时时隙的最佳接收信号强度)，则在下一时隙时，使δi(n+1)＝δi(n)×α2，0＜α2＜1，同时，将正、负反馈计数器清零并重新累加，并将第二阈值减小第二固定值，即减小负反馈计数器下一次的第二阈值，否则，在下一时隙时，使δi(n+1)＝δi(n)。即负反馈计数器统计连续接收到负反馈信号的次数，当该次数达到第二阈值时，就在下一时隙时自动减少相位扰动的步长，并减少该第二阈值的值，从而提高收敛后期的收敛速度。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (4)

  1. 一种基于累积正反馈的闭环式相位同步方法，其特征在于，包括如下步骤：
    步骤A：各源节点在第1时隙以各自的发射相位θi(1)同时向目标节点发射信号；目标节点检测第1时隙接收到的信号总强度R(1)，并将其作为第2时隙的最佳接收信号强度Rbest(2)，然后进入第2时隙；θi(1)为第i源节点在第1时隙的发射相位；
    步骤B：各源节点在第2时隙以各自的发射相位θi(2)同时向目标节点发射信号；θi(2)＝θi(1)+δi(2)，θi(2)为第i源节点在第2时隙的发射相位，δi(2)为第i源节点在第2时隙的随机相位扰动；目标节点检测第2时隙接收到的信号总强度R(2)，并判断R(2)是否大于第2时隙的最佳接收信号强度Rbest(2)，如果是，则发送正反馈信号给各源节点，且设第3时隙的最佳接收信号强度Rbest(3)＝R(2)，否则，发送负反馈信号给各源节点，且设Rbest(3)＝Rbest(2)；然后进入第3时隙；
    步骤C：各源节点在第n时隙以各自的发射相位θi(n)同时向目标节点发射信号，θi(n)＝θi(n-1)+δi(n)+ξi(n)；n为自然数，且n≥3，θi(n)为第i源节点在第n时隙的发射相位，δi(n)为第i源节点在第n时隙的随机相位扰动，ξi(n)为第n时隙的相位扰动调整值；当各源节点接收到的上一时隙目标节点发送的信号为正反馈信号时，ξi(n)＝0，当各源节点接收到的上一时隙目标节点发送的信号为负反馈信号时，ξi(n)＝-δi(n)；同时，目标节点检测第n时隙接收到的信号总强度R(n)，并判断是否R(n)＞Rbest(n)，Rbest(n)为第n时隙的最佳接收信号强度，如果R(n)＞Rbest(n)，则发送正反馈信号给各源节点，且设Rbest(n+1)＝R(n)，否则，发送负反馈信号给各源节点，且设Rbest(n+1)＝Rbest(n)；然后进入第n+1时隙；
    从第2时隙开始，各源节点通过正反馈计数器累加接收到正反馈信号的次数，如果在第n时隙时该次数未达到预设的第一阈值，则使δi(n+1)＝δi(n)；如果在第n时隙时该次数达到预设的第一阈值，则使δi(n+1)＝δi(n)×α1，α1＞1，同时， 将正反馈计数器清零并重新累加，并将第一阈值增大第一固定值。
  2. 如权利要求1所述的相位同步方法，其特征在于，从第2时隙开始，各源节点通过负反馈计数器累加连续接收到负反馈信号的次数，在负反馈计数器累加次数的过程中，一旦发生正反馈，则负反馈计数清零，并重新累加；如果在第n时隙时该次数未达到预设的第二阈值，则使δi(n+1)＝δi(n)；如果在第n时隙时该次数达到预设的第二阈值，则使δi(n+1)＝δi(n)×α2，0＜α2＜1，同时，将正、负反馈计数器清零并重新累加，并将第二阈值减小第一固定值。
  3. 一种分布式通信系统，其特征在于，包括目标节点和若干源节点；
    各源节点在第1时隙以各自的发射相位θi(1)同时向目标节点发射信号；目标节点检测第1时隙接收到的信号总强度R(1)，并将其作为第2时隙的最佳接收信号强度Rbest(2)，然后进入第2时隙；θi(1)为第i源节点在第1时隙的发射相位；
    各源节点在第2时隙以各自的发射相位θi(2)同时向目标节点发射信号；θi(2)＝θi(1)+δi(2)，θi(2)为第i源节点在第2时隙的发射相位，δi(2)为第i源节点在第2时隙的随机相位扰动；目标节点检测第2时隙接收到的信号总强度R(2)，并判断R(2)是否大于第2时隙的最佳接收信号强度Rbest(2)，如果是，则发送正反馈信号给各源节点，且设第3时隙的最佳接收信号强度Rbest(3)＝R(2)，否则，发送负反馈信号给各源节点，且设Rbest(3)＝Rbest(2)；然后进入第3时隙；
    各源节点在第n时隙以各自的发射相位θi(n)同时向目标节点发射信号，θi(n)＝θi(n-1)+δi(n)+ξi(n)；n为自然数，且n≥3，θi(n)为第i源节点在第n时隙的发射相位，δi(n)为第i源节点在第n时隙的随机相位扰动，ξi(n)为第n时隙的相位扰动调整值；当各源节点接收到的上一时隙目标节点发送的信号为正反馈信号时，ξi(n)＝0，当各源节点接收到的上一时隙目标节点发送的信号为负反馈信号时，ξi(n)＝-δi(n)；同时，目标节点检测第n时隙接收到的信号总强度R(n)，并判断是否R(n)＞Rbest(n)，Rbest(n)为第n时隙的最佳接收信号强度，如果R(n)＞Rbest(n)，则发送正反馈信号给各源节点，且设Rbest(n+1)＝R(n)，否则，发送负反馈信号给 各源节点，且设Rbest(n+1)＝Rbest(n)；然后进入第n+1时隙；
    从第2时隙开始，各源节点通过正反馈计数器累加接收到正反馈信号的次数，如果在第n时隙时该次数未达到预设的第一阈值，则使δi(n+1)＝δi(n)；如果在第n时隙时该次数达到预设的第一阈值，则使δi(n+1)＝δi(n)×α1，α1＞1，同时，将正反馈计数器清零并重新累加，并将第一阈值增大第一固定值。
  4. 如权利要求3所述的分布式通信系统，其特征在于，从第2时隙开始，各源节点通过负反馈计数器累加连续接收到负反馈信号的次数，在负反馈计数器累加次数的过程中，一旦发生正反馈，则负反馈计数清零，并重新累加；如果在第n时隙时该次数未达到预设的第二阈值，则使δi(n+1)＝δi(n)；如果在第n时隙时该次数达到预设的第二阈值，则使δi(n+1)＝δi(n)×α2，0＜α2＜1，同时，将正、负反馈计数器清零并重新累加，并将第二阈值减小第一固定值。
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