Low-detection complexity full-rate wireless cooperative relay transmission scheme

Abstract

The invention discloses a low-detection complexity full-rate wireless cooperative relay transmission scheme and is applied to a distributed wireless communication system employing an orthogonal frequency division multiplexing (OFDM) technology. The scheme is that: data to be transmitted of a source node is subjected to reasonable complex domain encoding in a frequency domain so as to obtain a full-diversity gain of the distributed wireless system and enhance channel fading resistance of signals in the cooperative relay transmission process; the encoded data is divided into two parts, is subjected to OFDM modulation and is transmitted by the source node in two adjacent time slots in turn; a relay node receives a first part of data from the source node in a first time slot and transmits the first part of data to a destination node in a second time slot by employing a cycle delay amplifying and forwarding mode; and a receiving end can finish decoding by only performing joint detection on two symbols through comprehensive processing of the received signals in the two time slots. The provided relay transmission scheme is simple in encoding structure, is applied to scenes with free number of relay antennae, can achieve full-diversity gain performance and obviously reduce the detection complexity, and has higher practical value compared with a relay scheme pursuing the transmission rate or error code performance only.

Description

A full-rate wireless cooperative relay transmission scheme with low detection complexity technical field The invention relates to a full-rate wireless cooperative relay transmission scheme with low detection complexity, belongs to the field of mobile communication, and is suitable for a distributed wireless communication system adopting orthogonal frequency division multiplexing technology. Background technique Wireless cooperative communication (CC: Cooperative Communication) technology uses the antennas of multiple mobile terminals distributed in different physical locations to construct a "virtual multiple-input multiple-output (MIMO: Multiple-Input-Multiple-Output) )” system, which overcomes the disadvantage that the single-antenna mobile terminal cannot obtain space diversity gain, and can realize data transmission with high bit error performance, has become one of the hot technologies with the most research value and application potential. Among many technologies fo...

AI Technical Summary

Problems solved by technology

When the number of relay nodes is large, the precoding matrix is ​​very complex, and the complexity of encoding and detection is very high, which is difficult to be practically applied

Choi et al. published the article "Randomized Cyclic Delay Code for Cooperative Communication Systems" (Randomized Cyclic Delay Code for Cooperative Communication Systems) in the United States "Institute of Electrical and Electronics Engineers Communication Letters" (IEEE COMMUNICATION SLETTERS) Volume 12, Issue 4, in April 2008, based on cyclic delay diversity technology, A distributed cooperative coding scheme with a unified receiver structure is proposed, which provides a new idea for the design of wireless cooperative communication networks with low detection complexity, but the research work of Choi et al. The space-frequency coding process is only completed between the relay node and the destination node, and the transmission rate of the system is still not high

In summary, in wireless cooperative communication networks, the contradiction between bit error performance, detection complexity and transmission rate is a problem that has not been satisfactorily resolved so far, and it is worthy of in-depth research and discussion

Images