对两种类型的抗多径干扰分析方法毕业设计

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1、 0 摘要摘要 本文以最小化系统总均方误差(Sun MSE)为准则，迭代设计线性收发机的方 案。该方案通过对接收机的改进设计，能够有效地避免传统 MMSE 设计过程中 出现的拉格朗日乘子不易计算的缺点，大大降低设计复杂度。由于拉格朗日乘子 有解析解，发射预编码矩阵也有闭式解，并且可以通过定点迭代算法有效解出。 收端的接收机也不用基站下发，只要各自采用 MMSE 均衡即可。仿真结果证明 该方法的有效性。基于数据块传输模型，将窄带 MIMO 并行干扰抵消接收机推 广到宽带 MIMO 信道，在理想信道和信道估计下，通过仿真评估了所提出的宽 带 MIMO 并行干扰抵消接收机的性能。仿真结果表明：所建议

2、的方案在宽带 MIMO 信道下的性能好于窄带 MIMO 信道下的性能， 在宽带 MIMO 信道下， 接 收机可获得比窄带下更大的分集增益。 本设计借助数学建模的有关方法，结合移动通信的有关知识，提出一种改进 的抗多径干扰的接收模型，该模型主要通过系统模型、信道模型、信道的相关函 数计算、波达方向估计算法、空自适应估计算法和空间自适应滤波算法等。并通 过相应参数设置各种算法，应用 MTLBEL 进行仿真验证。结果证明本问题所提 出的方法可以有效提高接受装置的抗干扰性能。 关键词：关键词：多径干扰，MIMO，空时信号处理，预编码，收发机联合设计 1 On the two types of anti

3、-multipath interference analysis method Abstract：An iterative linear transceiver design scheme under Sum Mean Squared Error (SMSE) minimization criterion is proposed. By modifying the structure of transceiver,the complex computation of Lagrangian multiplier within traditional MMSE transceiver design

4、 can be effectively obviated,and thus the whole system complexity can be greatly reduced. Because the Lagrangian multiplier has analytical solution transmit precoding matrix also has closed-form solution and can be solved easily with fixed-point iterations. The recelive filter is worked out independ

5、ently with MMSE criterion at each terminal, and the downlink singaling of each receiver filter form base station is not necessary. Simulations demonstrate that the proposed scheme is effective. Parallel interference cancellation receiver in flat fading MIMO channel was directly applied to frequency

6、selection MIMO channel based on block transmission model. The performance of proposed wideband receiver is evaluated based on perfect channels and channel estimation cases by computer simulation. Simulation results states the performances of MIMO space time processing algorithms based on frequency selective channel have the advantage over the algorithms based on flat MIMO channels,and the receiver can obtain more diversity gain than it is in flat MIMO system. With this design the method of ma