Space-Time Methods in Wireless Communication

高速无线数据服务需求的爆炸性增长凸显了多径无线电信道的带宽高效编码和调制技术的重要性。最近的信息理论结果表明，在发射器和接收器上部署多个天线可以显著增加无线信道的容量，而不会牺牲单天线系统所需的功率效率。为了在实践中实现这些增益，需要新的物理层信号处理技术（编码、调制、解码、均衡和阵列处理），这些技术更充分地利用了多输入/多输出无线电信道的时空结构。本计划的目标是开发新的工具，用于设计和分析多径无线电信道上的空时编码调制。解决了两个问题。第一部分讨论了在具有离散多径组件的信道上更准确地估计容量和代码性能的方法。第二部分是关于空时编码调制的新的并行编码方法，它在降低复杂度的同时提供了现有编码的性能提升。这项工作的最终目标是提高频谱效率和降低无线通信系统的功率要求。

The explosive growth in demand for high-speed wireless data services has underscored the importance of bandwidth-efficient coding and modulation techniques for multipath radio channels. Recent information-theoretic results have shown that deploying multiple antennas at both the transmitter and receiver can dramatically increase the capacity of wireless channels, without sacrificing power efficiency to the extent required by single-antenna systems. To achieve these gains in practice requires new physical-layer signal processing techniques (coding, modulation, decoding, equalization, and array processing) that more fully exploit the space-time structure of the multi-input/multi-output radio channel. The goal of this project is to develop new tools for the design and analysis of space-time coded-modulation on multipath radio channels. Two issues are addressed. The first deals with methods to more accurately estimate capacity and code performance on channels with discrete multipath components. The second is concerned with new parallel encoding methods for space-time coded-modulation, which offer the performance gains of existing codes at reduced complexity. The ultimate objective of this work is to increase spectral efficiency and reduce power requirements in wireless communication systems.