基于有限字符特性的物理层多播预编码技术

项目名称： 基于有限字符特性的物理层多播预编码技术

项目编号： No.61271272

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 许小东

作者单位： 中国科学技术大学

项目金额： 76万元

中文摘要： 多输入多输出（MIMO）预编码技术是增强物理层多播频谱效率和链路质量的有效手段，在未来无线通信系统中发挥重要作用。假设接收端采用最大似然（ML）接收机，本课题利用输入信号的有限字符特性（finite-alphabet features），系统研究基于最大最小欧氏距离准则的多播预编码方法，揭示适合多流数据传输的多播链路传输性能及其影响机理。在单组多播场景中，本课题首先将原优化问题转化为格基（lattice basis）构造问题，在格空间实现低复杂度最小距离预编码器，然后将该思路拓展至存在符号间干扰（ISI）的MIMO多播信道，提出适合最小距离预编码优化的统一理论框架。在群组多播场景中，本课题将高维空间复杂联合优化问题分解为多播组间功率分配和多播组内预编码两个独立优化子问题，然后以迭代方式依次逐组设计最小距离预编码器。理论分析和仿真实验将检验本课题所提出的方法的有效性及其理论性能。

中文关键词： 物理层多播；多输入多输出；预编码；有限字符集；有限冲激响应

英文摘要： MIMO precoding is an efficient way to reap the great gain of physical-layer multicasting in spectral efficiency and link reliability for next generation wireless communication systems. Assuming a maximum-likelihood (ML) receiver, finite-alphabet based precoding schemes for single-group and multiple-group multicast are investigated systematically in this proposal under the criterion of maximizing the minimum Euclidean distance between points in the received signal space. The underlying performance and mechanism of its impact are also revealed for physical-layer multicast with multi-stream data transmission. In single-group multicast case, we transform the original problem into lattice basis optimization problem and implement minimum distance-based precoder in lattice space with reduced-complexity. A generalized theoretical framework is readily derived with an extension of the lattice-based approach to MIMO-ISI channel. In multiple-group multicast case, we decompose the original high-dimensional high-complexity optimization problem into two independent subproblems of power allocation among groups and linear precoding for single-group multicast case, followed by an iterative and sequential design methodology of the minimum distance-based MIMO precoder. Theoretical analysis and simulation results will validate the e

英文关键词： physical-layer multicasting；Multiple-input multiple-output；precoding；finite alphabet；finite impulse response