CAJ | 학술논문

提出一种克服无线信道瑞利衰落和高斯白噪声干扰的非相干编码调制MIMO系统方案。纠错码采用IEEE 802.16e 中的非规则 QC-LDPC 码，非相干调制采用基于三角函数的酉空时调制(SC-USTM)。在接收端，推导出SC-USTM的最大后验概率（MAP）解调算法；为了降低复杂度，构造了SC-USTM 的双解调器方案；为了改善双解调的性能，在置信传播（BP）迭代解码器和MAP解调器之间引入了迭代反馈机制。仿真实验表明LDPC已编码SC-USTM的MIMO系统比未编码USTM的MIMO系统在510-误码率时，性能改善15~17 dB，并且整个系统具有较低的计算复杂度。
제출일충극복무선신도서리쇠락화고사백조성간우적비상간편마조제MIMO계통방안。규착마채용IEEE 802.16e 중적비규칙 QC-LDPC 마，비상간조제채용기우삼각함수적유공시조제(SC-USTM)。재접수단，추도출SC-USTM적최대후험개솔（MAP）해조산법；위료강저복잡도，구조료SC-USTM 적쌍해조기방안；위료개선쌍해조적성능，재치신전파（BP）질대해마기화MAP해조기지간인입료질대반궤궤제。방진실험표명LDPC이편마SC-USTM적MIMO계통비미편마USTM적MIMO계통재510-오마솔시，성능개선15~17 dB，병차정개계통구유교저적계산복잡도。
A practical low-density parity-check(LDPC) coded unitary space-time modulation (USTM) noncoherent MI-MO communication system over Rayleigh flat fading and additive white Gaussian noise (AWGN) channel was con-structed, where the LDPC code is selected from IEEE 802.16e Standard and USTM is constructed by the unitary matrix based on the sinc-cosinc function, SC-USTM for short. At the receiver, the maximum a posteriori probability (MAP) de-modulating algorithm of the SC-USTM was first designed;for reducing the complexity of MAP demodulator, the dual demodulator was then conceived;for improving the performance, the iterative feedback between the belief propagation (BP) decoder and the MPA demodulator was finally introduced. The simulation test shows that the system of the 510-LDPC coded SC-USTM is superior to the uncoded SC-USTM about 15~17 dB at BER , and this system has very low complexity.