双向中继无线网络及其关键技术研究

The main research contents in this project can be summarized as: 1) Consider a two-way relaying network with a single relay. We assume that the relay is interference limited and the two sources are only affected by the additive white Gaussian noise (AWGN). Based on this model, the system signal-to-interference noise ratio(SINR)is derived.Then, we present the analyses for the outage probability, bit-error rate, and capacity and investigate the effects of the number of interferers and the channel estimation error on the system performance;Moreover, we extend the analysis to a multiple-relay network and compare it with the relay selection scheme. 2)Consider a two-way relaying network with spectrum sharing. We first derive the outage probability and then analyze the spectrum sharing region and coverage. 3)Consider a two-way relaying network in which every node is equipped with multiple antennas. Assuming the amplify-and-forward protocol, we propose several antenna selection schemes and analyze the system performance. 4)Consider a multiple-relay two-way relaying network with multiple antennas at every node. We adopt the zero-forcing algorithm to process the received signals at the relay or sources. After deriving the effective SNRs, the corresponding performance is analyzed. 5)Consider a spectrum sharing system with multiple antennas at every node. The main intention is to investigate the scaling law of the system capacity under two different transmission schemes. In a conclusion, these results will provide some theoretical bases for the application of the two-way relaying.

本项目将围绕双向中继网络及频谱感知技术，开展以下工作：1）首先考虑一个单中继双向中继网络，假设中继处为干扰受限，两信源处仅受噪声影响，基于此模型，导出系统信干噪比(SINR)，然后分别分析系统中断概率、误码率及容量，考察干扰数及信道估计错误这些参数对系统性能的影响；另外，将上述模型延伸于一个多中继网络，并与中继选择方案进行比较。2）考虑具有频谱共享的双向中继网络，研究系统中断概率，然后分析频谱共享区域及网络覆盖区域。3）研究一个多天线配置的双向中继网络，采用AF传输协议，我们将提出几种不同的天线选择方案，分析各自的系统性能并加以比较。4）研究一个多中继多天线的双向中继网络，采用迫零处理算法来简化接收机结构，然后我们分析系统性能。5）考虑一个多天线配置的频谱共享网络，研究其容量变化规律。总体而言，这些研究结果将为双向中继网络的实际应用提供理论指导。

中继技术能够改善无线通信系统的覆盖区域从而提供系统的可靠度而引起广泛关注，本项目主要基于中继技术开展了以下研究：1）考虑了一个任意中继选择方式下的双向中继网络性能，其中分别考虑了对数正态分布衰落及通用K分布下的系统性能。2）考虑了一个具有中继选择及没有中继选择的双向中继网络性能。3）研究了一个频谱共享MIMO空分复用系统下的容量。4）考虑了一个中继帮助全光域FSO系统性能。5）研究了一个变增益RF/FSO中继系统性能。6）研究了一个具有共道干扰的放大转发混合卫星/陆地通信系统性能。7）研究了一个RF端具有多用户分集的混合RF/FSO中继系统性能。8）考虑一个接收端存在多用户分集的FSO系统性能。9）考虑一个接收端存在多孔径的FSO系统渐近性能。这些研究成果均发表在国际期刊上，为中继技术及FSO技术的实际应用提供理论指导作用。