计算机科学 ›› 2019, Vol. 46 ›› Issue (10): 97-102.doi: 10.11896/jsjkx.180901777
所属专题： 网络通信
蒋炫佑, 魏以民, 王雷, 刘灵君, 彭磊
JIANG Xuan-you, WEI Yi-min, WANG Lei, LIU Ling-jun, PENG Lei
摘要： 在数字通信系统中,均匀星座分布的离散信号经过功率受限、噪声功率谱密度一定的AWGN信道传输后,最大信息速率无法达到高斯信道容量。为了更好地提高传输速率使其逼近信道容量,信号星座的非均匀分布设计是非常必要的。为此,提出了一种基于Box-Muller变换,在星座点数趋近无穷时满足高斯分布的M-APSK信号星座构建方法,并通过仿真对其信道容量可实现性进行了验证。实验结果表明,与矩形M-QAM信号相比,该信号在调制阶数较高时星座容量指标得到了可观的提升。在此基础上,根据该星座分布的特点,设计了基于格雷编码和简化Max-Log LLR算法的调制解调方案,明显降低了系统复杂度。通过对系统复杂度、误比特率进行Matlab仿真,验证了所提方案的相关性能。
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