一种基于速率分离的多速率多用户检测方法

Rate-separation-based multi-rate multi-user detection method

针对CDMA加性白高斯噪声和瑞利衰落信道,基于扩频信号的循环平稳特性,提出了一种基于速率分离的多速率多用户检测算法。它由速率分离和单速率多用户检测复合组成。速率分离采用盲自适应频率移位滤波(FRESH),有效利用了多速率这一有用信息,先将与目标用户速率不同的所有用户信号虑除,这样剩余信号中只含有与目标用户速率相同的一种速率,极大地提高了单速率多用户检测器的输入信干噪比,获得了超过单速率的检测性能。

This paper proposes a rate-separation-based multi-rate multi-user detection method by the use of cyc-lostationarity of direct spread spectrum CDMA signals with the additive white Gaussian noise and the Rayleigh fading.The proposed method consists of the rate-separation and the single-rate multi-user detector.The rate-separation is realized based on the blind adaptive frequency-shift filtering.The multi-rate information can be utilized to improve effectively the input signal-to-interference-noise ratio of the single-rate multi-user detector.Simulation results show that the proposed multi-rate multi-user detector is superior to the single-rate multi-user detector.