第三代移动通信系统中非线性多用户检测技术

Non-linear Multi-user Detection Technology for 3G

在CDMA系统中,多用户检测技术是提高系统容量,减少用户间干扰的关键。非线性多用户检测包括干扰消除和神经网络检测技术。其中干扰消除检测是对不同用户独立进行MAI估计,然后从接收信号中减去对该用户而言的部分或全部MAI;多用户检测从本质上看是一个组合优化问题,所有解决组合优化的算法原则上均可适用于多用户检测,其中基于神经网络的解组合优化方法当然也适用于多用户检测。本文论述了几种非线性多用户检测器的基本原理及其特点。

Multi-user detection is a key technique to increase the capacity and to reduce the interference for a CDMA system. Non-linear Multi-user detection technology including interference cancellation and neural network detection technology. Interference cancellation detection estimate MAI independently for different users, then cut-down some or all of MAI from receiving signals for the user; Multi-user Detection belongs to combination and optimization from its nature, all the methods about combination and optimization may be applied in principle, neural network detection also be suitable to Multi-user Detection. The principles and features of several non-linear multi-user detectors are introduced in this paper.