基于空频分集的合作通信协议

Cooperative communication protocol exploiting space-frequency diversity

为了提高无线通信的有效性和可靠性,提出了一种基于空频分集的合作通信协议。它通过联合利用传输频带间的衰落不相关特性和中继链路间的衰落不相关特性,获得更高的分级和复接增益。仿真结果表明:该协议的分集增益为3,而复接增益为1,优于选择中继和附加中继协议。当中断概率低于10-2时,该协议可以获得至少3 dB的信噪比增益。利用频率分集能够有效提高合作通信的性能。

A cooperative communication protocol exploiting the space-frequency diversity is proposed to improve the efficiency and reliability of wireless communications. The method jointly uses the independent fading channels in various frequency bands as well as various relay paths to achieve better diversity and multiplexing gain than conventional protocols. Simulations demonstrate that the protocol gives a diversity gain of 3 and a multiplexing gain of 1. Thus, this protocol achieves higher efficiency and reliability than selection relaying protocols and incremental relaying protocols. When the outage probability is required to be less than 10^-2, the protocol can achieve at least 3 dB Signal-to-Noise gain over conventional methods. Thus, frequency diversity greatly enhances the cooperative communications.