Robust Codes for Space-Time Communication, Iterative Decoding, and Multi-Rate Broadcast

用于时空通信、迭代解码和多速率广播的鲁棒代码

基本信息

批准号：
0209110
负责人：
Richard Wesel
金额：
$ 24万
依托单位：
University of California-Los Angeles
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2002
资助国家：
美国
起止时间：
2002-09-01 至 2005-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0209110&HistoricalAwards=false
关键词：
Robust Codes Space Time Communication

项目摘要

The primary goal of this research is to produce practical codes that provideunequaled robustness, approaching the performance predicted by compoundchannel information theory for linear Gaussian channels. The resultingchannel codes will find application in many scenarios including wired andwireless broadcast, wireless local area networks, asymmetric digitalsubscriber lines, military anti-jam communications, and frequency hoppedcommunications.Results from compound channel information theory state that a single codeexists that supports communication over every channel that has a mutualinformation above the information rate of the code. Thus, once thetransmitter power spectrum is fixed, a code need not be specialized to aparticular frequency selective channel in a single antenna system or aparticular space-time path-gain matrix in a multiple antenna system. Whilethis theoretical result is more that thirty years old, practical code designhas focused to date on a weaker notion of robustness, that of averageperformance according to a statistical channel model, such as Rayleighfading. The power of the code design approach taken in thisresearch is that the code design is independent of statistical assumptionsabout the channel. The code simply works on every channel that it possiblycould.A second goal of this research is to develop codes that support multiplerates to different users. Here again, information theory (this timeinformation theory for degraded broadcast channels) lays out the limits ofperformance. Our research will closely approach these performance limits byapplying turbo codes to the concept of superposition coding for the degradedbroadcast channel.

这项研究的主要目的是生成可提供固定鲁棒性的实用代码，以接近通过线性高斯通道的复合方式信息理论预测的性能。所得的渠道代码将在许多情况下找到应用程序，包括有线和无线广播，无线局部网络，不对称的DigitalSubScriber线，军事反JAM通信和频率HoppedCommunications。复合渠道信息理论的分解，该理论指出，单个Codeexists在每个频道上都支持该频道的单个沟通，该频道上的通信具有以上相互量的信息率。因此，一旦固定了Thetransmitter功率谱，就不必在单个天线系统或多个天线系统中的单个天线系统或公共时空途径矩阵中专门针对公共频率选择性通道。虽然理论上的结果更是，迄今为止的30年历史了，迄今为止，专注于较弱的鲁棒性概念，该概念是按照统计渠道模型（例如Rayleighighfading）的平均强度概念。本研究中采用的代码设计方法的功能是，代码设计与统计假设无关。该代码仅适用于它可能会产生的每个渠道。这项研究的第二个目标是开发支持多个用户的多个用户的代码。在这里，信息理论（这种降级广播渠道的时间信息理论）列出了表现的限制。我们的研究将通过将Turbo代码应用于DegradedBroadcast频道的叠加编码概念来紧密接近这些性能限制。