直达链路下的多用户分集与全双工中继系统

Multi-User Diversity and Full-Duplex Relay System With Direct Link

针对多目的地传输网络,研究基于时间切换协议的全双工协作中继方案.考虑源和每个目的地之间存在直达链路,中继采用天线选择技术以实现最小化自干扰,目的地采用最大比合并技术以实现最大化接收信噪比.运用高斯-切比雪夫积分和次序统计量,推导出4种目的地选择策略下的延迟受限吞吐量近似闭合表达式.数值分析和蒙特-卡洛仿真结果表明:最佳吞吐量取决于协议的时间切换比和源功率分配比;与其他3种策略相比,最佳目的地选择策略更适用于分布式多用户选择网络;提高源发送功率或增加目的地个数均能显著提升系统吞吐量性能.

According to the multiple destination transmission network,a full-duplex cooperative relay scheme is investigated based on time switching protocol.Consider a direct link between the source and each destination,in the case of that the relay adopts antenna selection technology to minimize self-interference and the destination adopts the maximum ratio combining technology to maximize the received signal-to-noise ratio.The approximate closed expression for delay-limited throughput under four destination selection strategies are derived by using Gauss-Chebyshev quadrature and order statistic.The results of numerical analysis and Monte-Carlo simulations show that the optimal throughput critically depends on time switching and source power splitting coefficients of the protocol.The best destination selection strategy is more suitable for distributed multi-user selection network than the other three strategies.The systematical throughput performance can be significantly improved whether by increasing the source transmit power or increasing the number of destinations.