时延约束条件下MIMO多接入信道传输策略和功率分配  

Transmission Strategy and Power Allocation for MIMO Multiple Access Channels with Delay-limited Constraints

作　　者：潘成康[1] 蔡跃明 徐友云[1] 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007

出　　处：《电子学报》2004年第F12期118-122,共5页Acta Electronica Sinica

基　　金：国家自然科学基金 (No .60 372 0 80 ) ;国家 863基金 (No .2 0 0 3AA1 2 331 0 0 7)

摘　　要：本文分析了时延约束条件下多输入多输出 (MIMO)多接入信道的发送优化问题 ,利用标准优化方法 ,给出了多用户的传输策略和功率分配方案 ,具体分两步考虑 :第一步通过应用顺序译码方法 ,给出每个用户基于干扰回避的分布式优化预编码字 ;第二步对每个用户进行单用户信道的注水功率分配 .同时应用MMSE(MinimumMeanSquareError)接收结构结合串行干扰消除技术 ,给出了一种基于独立SINR(SignaltoInterferencePlusNoiseRatio)准则的次优功率分配方案 .数值结果表明 ,给出的最优传输和次优传输策略性能非常相近 ,可以显著提高时延约束条件下系统的性能和容量 .Transmission Optimization for Multiple-Input Multiple-Output (MIMO) Multi-access channel with delay-limited constraints is analyzed.Applying standard optimization method,the transmission strategies and optimal power allocation schemes are proposed for users.To reduce the complexity of the optimal solution,the analysis is considered in two stages.The first stage gives the distributed optimal pre-codeword ensembles for users using successive decoding and interference avoidance methods.The second stage allocates power for users in the equivalent single-user channel using the water-filling method.The best possible ordering of users for successive decoding is also involved.We propose a suboptimal power control strategy based on individual SINR constraints as a substitute for the optimal one when employing the MMSE receiver with successive interference cancellation.Numerical results show that the optimum transmission strategy and the suboptimal one combined with power allocation have the similar performance and both are capable of improving the system capacity and performance.

关 键 词：多输入多输出系统 多接入信道 时延约束容量 功率分配 干扰回避 

分 类 号：TN929.5[电子电信—通信与信息系统]