Research On Optimization Of Two Transmit Preprocessing Algorithm In Multiuser Mimo Downlink

Nowadays there exists two transmission schemes in wireless communication system.One is conventional transmitter orientation technique, for example, joint detection, its disadvantage need do channel estimation and complex detection algorithm at receiver, for the BS is easy to implement these complex processing , but for the MTs in multiuser MIMO downlinks which we researched in wireless communication system are difficult to achieve complex computation. To overcome this shortcoming, the receiver oriented transmission preprocessing technique is recently welcome.This paper mainly research two transmission preprocessing algorithm optimization and its performance analysis in multiuser MIMO downlinks. At first, To optimize antenna arrays'spatial characteristics at the BS based on linear oriented transmission scheme (JT) combined with MIMO antenna structure to obtain a novel modulation algorithm. Simulation parameters refer to TD-SCDMA system, Simulation results demonstrate that the performance of this transmission algorithm optimized outperform conventional JT MIMO. Secondly, with respect to reducing transmit energy at the BS, a nonlinear receiver oriented transmit scheme is analysed. By nonlinear signal processing at transmitter and choosing a suitable quantization scheme at receiver to reduce transmit energy and eliminate intercell interference and magnetic radiation.