Differential Relay Cooperative Communication Method Using Quadrature Amplitude Modulation

A quadrature amplitude modulation and cooperative communication technology, applied in the field of communication, can solve the problems of poor differential PSK bit error rate performance and unsuitable for high-speed data transmission, etc., and achieve the effect of improving bit error rate performance and high signal-to-noise ratio gain.

CN102271119AInactive Publication Date: 2011-12-07XIDIAN UNIV
5 Cites 15 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2011-12-07
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The present invention provides a differential relay cooperative communication method using quadrature amplitude modulation, which mainly solves the problem of poor bit error rate performance under high-order modulation in the prior art. The implementation steps are: (1) Compare the signal-to-noise ratio of the relay link, and select the one with the highest signal-to-noise ratio from multiple relay nodes as the best relay node; (2) The source node first constellates the transmitted information. Mapping and differential modulation, and then send the differentially modulated output signal to the destination node and the best relay node; (3) The best relay node first performs differential demodulation and differential modulation on the received signal, and then converts the differentially modulated The output signal is forwarded to the destination node; (4) The destination node first performs differential demodulation on the transmitted signal of the source node and the transmitted signal of the optimal relay node, and then performs maximum ratio combining on the output signals of the differential demodulation, and finally performs the maximum ratio combination on the maximum Constellation inverse mapping is performed on the combined output signal to obtain the source information. The invention can improve the bit error rate performance of the cooperative communication system.
Need to check novelty before this filing date? Find Prior Art