时选衰落信道中的坐标交织空时分组码
doi: 10.3724/SP.J.1146.2007.00740
Coordinate Interleaved Space-Time Block Codes over Time-Selective Fading Channels
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摘要: 为了提高空时分组码在时选衰落信道下的性能，该文提出了坐标交织空时分组码(Coordinate Interleaved Space-Time Block Code, CISTBC)。和已有的空时分组码相比，CISTBC将各码元的虚部和实部分别从不同的天线发射，充分利用了信道系数的时变特性带来的多径传输，提高了码元的抗深度衰落能力。另外，该文分析了基于QR 分解和高斯近似的连续干扰消除算法对不同码元解码性能的影响，给出了循环连续干扰消除算法来减少误差传递，进一步提高了系统性能。分析和仿真表明，CISTBC有效地改善了分组码在时选信道下的性能。Abstract: To improve the porformance of Space-Time Block Code (STBC) over time-selective fading channels, the Coordinate Interleaved Space-Time Block Code (CISTBC) is proposed. Compared with the existing STBC, CISTBC sends the real and imaginary parts of each symbol from different antennas. This makes the best of the multi-path transmission resulted from the time-varing character of the channel coefficients and strengthens each symbols resistance to the deep fading. Moreover, from QR decompostion and gaussian approximation (GA), the impact of successive interference cancellation (SIC) algorithm on different symbols decoding performnance is analyzed. A Circular SIC (CSIC) algorithm to combat the error propagation and obtain an extra performance gain is developed. Analysis and simulations demonstrate that CISTBC can effectively improve the performance of STBC over time-selective fading channels.
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