研究十六相移相键控(16PSK)对低密度奇偶校验码(LDPC)调制下的对数似然比(LLR)算法,分析在16PSK调制下LDPC码的初始信息的计算方法,并推导出初始信息公式。仿真表明:LDPC码在16PSK调制下展现出优良的译码性能。当信噪比为3.8 d B时,误...研究十六相移相键控(16PSK)对低密度奇偶校验码(LDPC)调制下的对数似然比(LLR)算法,分析在16PSK调制下LDPC码的初始信息的计算方法,并推导出初始信息公式。仿真表明:LDPC码在16PSK调制下展现出优良的译码性能。当信噪比为3.8 d B时,误码率可达到10-6数量级。展开更多
提出一种基于APSK信号的分布式MIMO差分编码及检测方法:发送端将待发射的数据符号与前一个发射矩阵中的数据符号进行相位和幅度差分调制,生成新的发射矩阵进行发射;接收端对接收信号匹配滤波之后,利用前后接收量判断相位信息和幅度信息...提出一种基于APSK信号的分布式MIMO差分编码及检测方法:发送端将待发射的数据符号与前一个发射矩阵中的数据符号进行相位和幅度差分调制,生成新的发射矩阵进行发射;接收端对接收信号匹配滤波之后,利用前后接收量判断相位信息和幅度信息恢复出发送端数据。该方法使得系统无需进行信道估计,频谱效率与V-BLAST(Vertical Bell Laboratories Layered Space-Time)相同,但不受天线数目限制,解决了传统V-BLAST算法无法进行非相干检测的难题。仿真结果显示,该算法在不同信道传播时延情况下的误码率性能不同。展开更多
Traditional Amplitude Phase Shift Keying （APSK） consists of rings with points uniformly spaced. By giving up this uniform-spacing feature, we propose an APSK optimization method based on the uniform APSK with Gray l...Traditional Amplitude Phase Shift Keying （APSK） consists of rings with points uniformly spaced. By giving up this uniform-spacing feature, we propose an APSK optimization method based on the uniform APSK with Gray labeling （Gray-APSK）. The aim of the optimization is to maximize the Generalized Mutual Information （GMI） of Bit-Interleaved Coded Modulation （BICM） for the targeted code rate and channel. We show that our optimized non-uniform APSK could offer further performance gain compared with the conventional uniform Gray-APSK and considerably outperforms the traditional quadrature amplitude modulation at the targeted SNR and channel.展开更多
文摘提出一种基于APSK信号的分布式MIMO差分编码及检测方法:发送端将待发射的数据符号与前一个发射矩阵中的数据符号进行相位和幅度差分调制,生成新的发射矩阵进行发射;接收端对接收信号匹配滤波之后,利用前后接收量判断相位信息和幅度信息恢复出发送端数据。该方法使得系统无需进行信道估计,频谱效率与V-BLAST(Vertical Bell Laboratories Layered Space-Time)相同,但不受天线数目限制,解决了传统V-BLAST算法无法进行非相干检测的难题。仿真结果显示,该算法在不同信道传播时延情况下的误码率性能不同。
基金supported by the China Electric Power Research Institute (CEPRI) (No. TX71-13-007)Science Fund for Creative Research Groups of NSFC (No. 61321061)
文摘Traditional Amplitude Phase Shift Keying （APSK） consists of rings with points uniformly spaced. By giving up this uniform-spacing feature, we propose an APSK optimization method based on the uniform APSK with Gray labeling （Gray-APSK）. The aim of the optimization is to maximize the Generalized Mutual Information （GMI） of Bit-Interleaved Coded Modulation （BICM） for the targeted code rate and channel. We show that our optimized non-uniform APSK could offer further performance gain compared with the conventional uniform Gray-APSK and considerably outperforms the traditional quadrature amplitude modulation at the targeted SNR and channel.
