基于单载波频域均衡的双向异步空时编码方案

A Space-time Coding Scheme for Two-way Asynchronous Communication Based on Single Carrier Frequency Domain Equalization

在异步双向协作通信中,异步时延严重降低系统的性能。文中提出了一种基于单载波频域均衡(SC-FDE)的空时编码方案,以此来解决异步时延问题。该方案中,两源端节点对调制信号进行分块后同时发送给中继节点;中继节点进行简单的去共轭和时间反转操作后转发至各源端节点;接收端去除自身所发信号后进行频域均衡,即可获得所需信号。理论分析与仿真表明,该方案能有效消除时延的影响,并获得满协作分集增益。

In asynchronous two-way cooperative communication, asynchronous time delay seriously degrades the system performance. A space-time coding scheme based on Single Carrier Frequency Domain Equalization （SC-FDE） is proposed for this problem. In this scheme, two source nodes put the modulated signals into blocks and transmit them to the relay nodes. Some simple operations, namely complex conjugation and time reversion are implemented at relay nodes. The receivers can obtain the needed signals by subtracting their own signals from the mixed signals and doing FDE operation on signals. Theoretical analysis and simulations show that the proposed scheme can combat the timing errors effectively and achieve full cooperative diversity as well.