Variable-Rate Two-Phase Collaborative Communication Protocols for Wireless Networks
Variable-Rate Two-Phase Collaborative Communication Protocols for Wireless Networks
复制标题
DOI：
10.1109/tit.2006.880055
复制
发表时间：
2006-09
影响因子：
2.5
通讯作者：
H. Ochiai;P. Mitran;V. Tarokh
中科院分区：
文献类型：
--
作者：
H. Ochiai;P. Mitran;V. Tarokh
研究了无线网络中两阶段协作通信协议的性能。在准静态瑞利平坦衰落环境中，假设簇中所有通信节点共享同一信道，协同发送或接收。除了小尺度衰落外，还考虑了大尺度路径损耗的影响。基于解码和转发的方法，我们考虑各种可变速率两阶段协议，可以实现全分集顺序和分析的互信息的中断概率的节点的几何形状对其性能的影响。对于单中继节点的情况下，它表明，如果合作者节点是接近源节点，基于空时编码（STC）的协议可以获得良好的分集增益。否则，基于接收机分集的协议性能更好。这些协议也进行了比较，一个基于固定速率重复编码和节点的几何形状的性能权衡进行了研究。第二部分涉及多个继电器。它是已知的，与N中继N+1的渐近分集阶是可实现的STC为基础的协议在两阶段的框架。然而，在协作STC的框架中，那些解码失败的中继节点保持沉默（该事件被称为节点擦除）。我们表明，这种节点擦除有可能大大降低多样性的顺序，并指出设计的STC是对这种节点擦除鲁棒的重要性
The performance of two-phase collaborative communication protocols is studied for wireless networks. All the communication nodes in the cluster are assumed to share the same channel and transmit or receive collaboratively in a quasi-static Rayleigh flat-fading environment. In addition to small-scale fading, the effect of large-scale path loss is also considered. Based on a decode-and-forward approach, we consider various variable-rate two-phase protocols that can achieve full diversity order and analyze the effect of node geometry on their performance in terms of the outage probability of mutual information. For the single-relay node case, it is shown that if the collaborator node is close to the source node, a protocol based on space-time coding (STC) can achieve good diversity gain. Otherwise, a protocol based on receiver diversity performs better. These protocols are also compared with one based on fixed-rate repetition coding and their performance tradeoffs with node geometry are studied. The second part deals with multiple relays. It is known that with N relays an asymptotic diversity order of N+1 is achievable with STC-based protocols in the two-phase framework. However, in the framework of collaborative STC, those relay nodes which fail to decode remain silent (this event is referred to as a node erasure). We show that this node erasure has the potential to considerably reduce the diversity order and point out the importance of designing the STC to be robust against such node erasure