线性分散码与空间复用组合系统检测算法研究

Study of detection algorithm for linear-dispersion code and spatial multiplexing combined system

在空间上组合空时编码与空间复用技术可以使MIMO通信系统同时获得分集和空间复用增益.为了适合高速传输业务需求,提出线性分散码与空间复用组合系统.针对线性分散码与空间复用组合系统码块的线性结构特点,为了既能保证解码的有效又可以减小检测算法的运算成本,提出定步长改进球形检测算法.基于Matlab平台进行仿真试验,通过与空时正交分组码与空间复用组合系统的性能比较,证明在高频谱利用率的情况下,线性分散码与空间复用组合系统的性能更好,即更适合高速传输业务的需求;在检测算法方面,定步长改进球形检测算法虽然比球形解码算法损失了约1dB的性能,但是运算成本仅为球形算法的30%.

Space-time block code is combined with a spatial multiplexing technique in a multiple-input multiple-output （MIMO） system to simultaneously obtain diversity gain and spatial multiplexing gain. In order to adapt for a high-rate transmission operation, a linear-dispersion code and spatial multiplexing combined system was proposed. Compared with a space-time orthogonal code and spatial multiplexing combined system, the performance and high spectral efficiency of this system was better. In addition, simulation results show the constant-step modified sphere detection algorithm decreases the performance about 1 dB from the sphere decoding algorithm, but the calculation cost of the constant-step modified sphere detection algorithm is only 30 percent of that of the sphere decoding algorithm.