【摘要】 将低密度校验码(lowdesityparitycodes,LDPC)应用于一种简单的发射分集技术(spacetimeblockcodes,STBC)及自适应STBC,推导出LDPC码在与STBC级联并采用自适应功率分配算法时的译码方法,通过计算机仿真研究了其在Rayleigh衰落信道下的性能.采用发射分集技术可以提供分集增益,提高了系统的性能,而利用由接收端反馈的信道状态信息,可以在发射端采用自适应功率分配算法,使LDPCSTBC的系统性能有进一步的改善.另外,在相似的译码复杂度下,给出了LDPCSTBC与turboSTBC的性能比较.更多还原

【Abstract】 LDPC codes are applied to a simple transmit diversity technique and adaptive transmit diversity technique. The decoding algorithm of LDPC codes when concatenated with STBC in deduced. The performance of LDPC-STBC and adaptive LDPC-STBC under Rayleigh fading channel is given through computer simulation. The simulation results show that the adaptive LDPC-STBC is much better than adaptive STBC without LDPC and the nonadaptive LDPC-STBC. The performance of adaptive LDPC-STBC and that of adaptive turbo-STBC under the same conditions are compared.更多还原