WCDMA下行链路接收机设计

Design of receiver in WCDMA downlink

根据下行链路的需求设计了可以满足实时性需要的接收机。在下行链路中,只有所希望的用户信号被解调,而抑制其他用户引起的干扰。针对这一特点,下行链路接收主要采用单用户接收机,在本文中对各种单用户接收算法进行了分析、仿真及性能比较,本文的单用户接收算法采用自适应LMMS单用户接收算法。采用的接收机是在自适应LMMSE接收机基础上提出的差分自适应接收机,该接收机运算量比较小,性能比较好,并且能够跟踪同步,能够在用户终端上使用。

The main feature of this paper is that we design a receiver which can satisfy timeliness needs according to demands of the downlink. In downlink, only the expected subscriber signal will be demodulated, meanwhile, the disturbance which other users cause will be suppressed. In view of this characteristic, the signal receive of the downlink mainly uses the single receiver. This paper has carried on the analysis, the simulation and the performance comparison to each kind of single user receive algorithm, and the single user receive algorithm of this paper uses the auto-adapted LMMS single user receive algorithm. The receiver we use is a difference auto-adapted receiver which is proposed in the foundation of auto-adapted LMMSE receiver. The operand of this receiver is quite small, the performance is quite good, and it can track the synchronization, which can be used in the user terminal.