【摘要】 分析了宽带码分多址多卫星通用移动电信系统(UMTS)环境前向链路中应用的一些不同分集方案空时码性能。为实现空时Turbo编码调制(STTCM),采用了卷积码(CC)和迭代译码,并在两卫星环境下对不同发送方案进行了模拟。结果显示,在低信噪比(SNR)时,选择式发射分集(STD)的误码率(BER)和误帧率(FER)优于其他方案。随着SNR的增大,空时格码(STTC)(未编码系统)和STTCM(编码系统)的FER最佳。更多还原

【Abstract】 The performances of some space-time code schemes applied to the forward link of a wide band code division multiple access under multi-satellite universal mobile telecommunication system environment were analyzed in this paper. The convolutional code plus an iterative decoding had been used to perform a space-time turbo coding modulation. The simulation results showed that the bite error rate (BER) and frame error rate (FER) of selective transmit diversity were the best under the low signal noise rate (SNR), and the FER of space-time tvellis code and space-time turbo coding modulation became the best while the SNR increasing.更多还原