Frequency reversal transmission scheme of full diversity in cooperative communication system

Abstract

The invention relates to a transmission scheme for a cooperative communication system with carrier frequency deviation, and belongs to the wireless communication field. The invention aims to solve the problem that reliability of signal transmission is decreased dramatically due to the carrier frequency deviation existing in the cooperative communication system, and provides a frequency reversal encoding scheme and a zero-forcing decoding method with low complexity. The core part of a main algorithm of the frequency reversal transmission scheme is characterized in frequency reversal of encoding codes, so that an equivalent channel matrix between a relay node and a target node in the cooperative communication system is a complex orthogonal matrix, and the target node can restore and transmit a signal correctly by processing the received signal simply. Through comparing with the existing method at present, the frequency reversal transmission scheme provided by the invention makes the reliability of the cooperative communication system higher and the decoding complexity lower.

Description

technical field [0001] The invention mainly aims at the characteristic of carrier frequency offset in the cooperative communication system, and proposes a highly reliable signal transmission scheme. Background technique [0002] Each cooperative node of a multi-relay cooperative communication system only needs to configure one antenna to construct a virtual multiple-input single-output (MISO) wireless communication system. It is recognized as a promising technology that can improve the reliability of wireless communication networks. [0003] A synchronous cooperative communication system using distributed space-time block codes (distributed space-time block codes, DSTBCs) can obtain full diversity gain, that is, improve the signal transmission reliability of the cooperative communication system. However, the transmission reliability of the synchronous cooperative communication system depends on the precise synchronization between the various cooperative nodes, which greatly...

AI Technical Summary

Problems solved by technology

The cooperative communication system is very sensitive to multi-carrier frequency offset, so it becomes extremely difficult to reduce the impact of multi-carrier frequency offset on communication reliability

The existing methods against multi-carrier frequency offset are mainly the development of new space-frequency codes and corresponding decoders. The reliability of the cooperative communication system has been improved, but the coding gain and decoding complexity need to be improved.

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