地下巷道中无线通信空时编码的研究

Space-Time Coding in Tunnels

目前对多天线发送多天线接收(MIMO)系统的研究,大都基于信道是独立同分布的假设,而巷道通信由于受空间限制和传播环境影响,MIMO各信道之间具有很强的相关性.本文研究了地下巷道中强相关MIMO信道下的空时编码性能,推出了在此独特环境下的空时编码的性能界,并提出了一种能够补偿信道相关性对系统性能影响的空时分组编码方案——循环空时分组编码(CSTBC).理论分析和计算机仿真结果表明:该方案放宽了编码对正交性的要求,在地下巷道等强相关无线信道环境下,获得了比传统编码更好的系统性能.

The purpose of this paper is to investigate the performance and design of space-time code in tunnels. In the conventional space-time code designs, it was commonly assumed that the channels associated with different antennas are statistically independent. Experimental results have shown that MIMO channels in tunnels have strong correlation. In this paper, a design criterion of space-time coding for correlated MIMO channels was firstly acquired based on pairwise error probability (PEP) analysis. Following this, we proposed a new construction space-time block coding which can compensate the impact of spatial strong correlation MIMO channels in tunnels on the system. At last, the theoretical analysis and simulation results were also presented to illustrate the performance of the new encoding scheme.