A Synchronization Method for Self-Interference Canceller of Continuous Paired Carrier Multiple Access Communication Receiver

Abstract

The invention relates to a synchronization method of a self-interference canceller of a continuous PCMA communication receiver. When the self-interference canceller is out of synchronism, data framesare not sent any more, a local data frame cache region is cleaned clear, and training frames are sent continuously; the received local training frames are used to implement physical frame / timing combined synchronization of a self-interference signal; after synchronization, physical frame / timing combined synchronization tracking of the self-interference signal is started; in the synchronization tracking state, a first local self-interference data frame is captured with a try; and if capturing succeeds, local data frames are selected from the local data frame cache region sequentially to reconstruct and cancel the self-interference signal. It is not required to estimate transmission delay of a channel of the self-interference signal, the initial position of the physical frame of each self-interference signal can be found accurately after physical frame / timing combined synchronization of the self-interference signal, and it is further ensured that the self-interference signal sequence ofthe received mixed signals is strictly aligned with the self-interference signal sequence cached locally in the cancellation process.

Description

technical field [0001] The invention belongs to the synchronous technology, and in particular relates to a self-interference canceller synchronous method of a continuous paired carrier multiple access communication receiver. Background technique [0002] Frequency Division Multiple Access (FDMA) is a multiple access method widely used in continuous digital communication. Its characteristic is that each user sends or receives signals through an independent frequency band, thereby avoiding mutual interference (such as figure 1 shown). However, the frequency spectrum utilization rate of this multiple access mode is low, which in turn leads to a small user capacity of the communication system. Paired Carrier Multiple Access (PCMA) refers to the multiple access technology in which two users use the same frequency band to send or receive signals at the same time (such as figure 2 shown). Since the communication parties share spectrum resources, the spectrum utilization and use...

AI Technical Summary

Problems solved by technology

[0004] When performing self-interference cancellation, if the self-interference signal sequence in the mixed signal is strictly aligned with the self-interference signal sequence in the local buffer, then the canceller can fully remove the self-interference signal (such as Figure 4 shown); otherwise, the self-interfering signal cannot be sufficiently removed

Residual self-interfering signals can adversely affect desired signal demodulation

Therefore, the primary problem that the paired carrier multiple access communication receiver needs to solve is: in the process of self-interference cancellation, align the self-interference signal sequence in the mixed signal with the self-interference signal sequence in the local buffer, that is, self-interference cancellation sync problem

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