Space-Time Methods in Wireless Communication

高速无线数据业务需求的爆炸性增长，突出了多径无线信道带宽高效编码和调制技术的重要性。最近的信息理论的结果表明，部署在发射机和接收机的多个天线可以显着增加无线信道的容量，而不会牺牲功率效率的程度所需的单天线系统。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），其更充分地利用多输入/多输出无线电信道的空时结构。 本项目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。第一个涉及的方法，更准确地估计容量和离散多径分量的信道上的代码性能。第二个是关于新的并行编码方法的空时编码调制，它提供了现有的代码在降低复杂度的性能增益。这项工作的最终目标是提高频谱效率，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.