基于混合消息传递和部分高斯近似的联合信道估计MIMO-OFDM接收机

发布时间：2018-04-06 21:07

本文选题：混合消息传递算法　切入点：MIMO-OFDM接收机　出处：《信号处理》2017年10期

【摘要】：本文提出了一种基于混合消息传递和部分高斯近似(Partial Gaussian Approximation,PGA)的多用户干扰消除方法,并应用到联合信道估计MIMO-OFDM接收机中。由于多用户干扰模型中存在的"乘积-求和"结构,使得选择标准消息传递规则,如置信传播(Belief Propagation,BP),期望传播(Expectation Propagation,EP),平均场规则(Mean Field,MF),或者联合方法时只能在性能或复杂度方面有所取舍。现有根据标准消息传递规则得到的最优性能接收机复杂度高,而近似程度大的低复杂度接收机性能损失严重。本文根据多用户干扰模型的自身特点,对标准消息传递规则进行了修改,提出了一种基于混合消息传递规则和部分高斯近似的多用户干扰消除方法。依据信道估计过程中不同用户的信道权重,采用不同的消息传递规则,可以实现复杂度和性能的均衡调整。仿真结果表明,本文提出的多用户干扰消除方法,在性能接近已知最优接收机的情况下,能够大幅降低复杂度。
[Abstract]:This paper presents a mixed message and Gauss (Partial Gaussian Approximation, based on approximate PGA) multiuser interference cancellation method, and applied to the joint channel estimation in MIMO-OFDM receiver. The multi user interference model in the presence of "product sum" structure, the selection criteria of message passing rules, such as belief propagation (Belief Propagation, BP), (Expectation Propagation, EP expectation propagation (Mean), mean field rules Field, MF), or a combination of methods only trade-offs in performance or complexity. According to the existing optimal performance of receiver standard message passing rules are of high complexity, and high degree of approximation and low complexity receiver the performance loss is serious. According to the multi user interference model of its own characteristics, the standard message passing rules were modified to propose a mixed message transfer based on rules and Multi user interference cancellation method. The Gauss approximation based on channel estimation weights of different users in the process of using different message passing rules, can adjust the balance of complexity and performance. The simulation results show that the proposed multiuser interference cancellation method, in close to the known optimal receiver, can greatly reduce complexity.

【作者单位】：解放军信息工程大学;河南广播电视大学信息工程学院;郑州大学信息工程学院;清华大学宇航研究中心;
【基金】：国家自然科学基金资助项目(61571402,61201251,U1204607)
【分类号】：TN929.53

【相似文献】