脉冲噪声中基于广义恒模算法的多用户检测

Multi-user detection based on generalized constant modulus algorithm in impulsive noise

在高斯白噪声信道中提出的各种多用户检测方法在脉冲噪声存在的情况下出现了明显的质量下降,而实际的物理信道中又经常伴随着脉冲噪声。将α-稳定分布噪声作为背景噪声模拟实际物理信道中存在的脉冲噪声,根据脉冲噪声的特殊性质,在恒模多用户检测算法的基础上将广义恒模算法应用到了多用户检测技术中去。仿真结果表明该算法在高斯白噪声以及-稳定分布的脉冲噪声中均取得的良好的性能,具有很好的鲁棒性。

The conventional muhi-user detection methods which are under the condition of Additive White Gaussian Noise （AWGN） channel assumption will incur significant performance degradation when there is impulsive noise in the channel. However,many physical channels,in the real situation,coexist with the impulsive noise.The α-stable distribution is adopted to imitate the impulsive noise occurring in many physical channels.Based on the character of impulsive noise and the elements of constant modulus algorithm,a muhi-user detection method based on generalized constant modulus algorithm is introduced. Simulation results indicate the method is robust and offer good performance in both AWGN channel and impulsive noise channel.