Unquantized and Uncoded Channel State Information Feedback in Multiple Antenna Multiuser Wireless Systems

多天线多用户无线系统中的未量化和未编码信道状态信息反馈

• 批准号: 0429724
• 负责人: Narayan Mandayam
• 金额: $ 20万
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-09-01 至 2008-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0429724&HistoricalAwards=false
• 关键词: Unquantized; Uncoded; Channel; State; Information

The potential and promise of multiple antenna techniques has now resulted in widespread considerations for the use of these in a variety of contexts: for wide area wideband wireless transmission in next generation cellular systems; for local area hot-spot data service overlays in cellular systems; for emerging short-range wireless LAN networks; for promoting efficient spectrum sharing in the unlicensed bands; and a variety of collaborative techniques in wireless adhoc networks. A key attribute required of any multiple antenna technique to be successful, in any of the above contexts, is the need for reliable and efficient channel state information (CSI). Delay requirements imposed by wireless applications and the time variations in the channel, require not only reliability in CSI information, but also that the feedback of such information be fast and frequent. This project studies the fundamental limits of CSI feedback schemes that can be used in multiple antenna multiuser wireless communication systems. A fundamental issue studied is if it is necessary for reliable CSI feedback to be optimally quantized and encoded in a Shannon theoretic sense? Specifically, unquantized and uncoded (UQ-UC) CSI feedback schemes are studied, that have the attractive feature of avoiding the delays due to quantization and coding, while still being optimal in certain situations relating to the uplink and downlink of wireless channels. In cases where such "zero-delay" schemes are sub-optimal, enhancements that can substantially improve performance are studied via (a) performance bounds for UQ-UC CSI feedback in FDD and TDD systems, (b) CSI feedback receivers, (c) information capacity of transmitter optimization in multiple antenna multiuser systems, and (d) comparative evaluation of UQ-UC CSI feedback with practical coded transmission.

多天线技术的潜力和前景现在已经引起了对在各种环境中使用这些技术的广泛考虑：用于下一代蜂窝系统中的广域宽带无线传输;用于蜂窝系统中的局域热点数据服务覆盖;用于新兴的短距离无线LAN网络;用于促进未授权频带中的有效频谱共享;用于无线通信系统中的无线通信系统。以及无线自组织网络中的各种协作技术。 在任何上述上下文中，任何多天线技术成功所需的关键属性是需要可靠且有效的信道状态信息（CSI）。由无线应用和信道中的时间变化强加的延迟要求不仅要求CSI信息的可靠性，而且要求这种信息的反馈快速且频繁。本计画研究可应用于多天线多用户无线通讯系统中之信道状态信息回馈机制的基本限制。研究的一个基本问题是，如果它是必要的可靠CSI反馈进行最佳量化和编码在香农理论意义上？具体而言，未量化和未编码（UQ-UC）的CSI反馈方案进行了研究，有吸引力的特点，避免了由于量化和编码的延迟，同时仍然是最佳的在某些情况下，有关的上行链路和下行链路的无线信道。在这种“零延迟”方案是次优的情况下，可以通过以下方式来研究可以显著提高性能的增强：（a）FDD和TDD系统中的UQ-UC CSI反馈的性能界限，（B）CSI反馈接收机，（c）多天线多用户系统中发射机优化的信息容量，以及（d）UQ-UC CSI反馈与实际编码传输的比较评估。