信源间全双工协作通信的空时编码算法研究

研究了具有三个全双工源节点的协作通信系统,为提升系统有效性和可靠性,提出了两种信源间全双工协作通信的空时编码方案。将正交空时码理论应用其中,可以有效利用空间分集增益,抵抗多径衰落,提高系统性能。方案分为共享兼传输阶段与协作传输阶段。在共享兼传输阶段进行信源间的信息共享同时也会向目的节点发送信息,在协作传输阶段,源节点间形成虚拟MIMO向目的节点发送信息。推导了系统各个接收端的中断概率,仿真结果表明,与现有源节点工作在半双工模式下的协作传输方案对比,该方案有效提升了吞吐量和中断概率性能,在中断概率为10-3时,该方案有1.5 dB左右的信噪比增益,与无协作传输对比,该方案有约8 dB左右的信噪比增益。 

Research on Space Time Coding Algorithm for Full Duplex Cooperative Communication between Source Nodes

The cooperative communication system with three full duplex source nodes was studied. In order to improve the effectiveness and reliability of the system, two space-time coding schemes for full duplex cooperative communication between two sources were proposed. The orthogonal space-time coding theory was applied to improve the performance of the system by effectively utilizing the spatial diversity gain, resisting multipath fading. The scheme was divided into sharing and transmission phase and cooperative transmission phase. In the sharing and transmission phase, the information was shared between the sources and sent to the destination node. In the cooperative transmission phase, virtual MIMO was formed between the source nodes to send information to the destination node. The outage probability of each receiver was deduced. The simulation results show that, compared with the traditional source node transmission scheme working in half duplex mode, the scheme can effectively improve the throughput and the outage probability performance. At the same time, when the outage probability is 10-3, the scheme has a signal-to-noise ratio gain of about 1.5 dB, and compared with the non-cooperative transmission, the scheme has a signal-to-noise ratio gain of about 8 dB.