Adaptive Code Division Multiple Access Systems

自适应码分多址系统

• 批准号: 9505887
• 负责人: Stephen Wicker
• 金额: $ 23.69万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-09-15 至 1998-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9505887&HistoricalAwards=false
• 关键词: Adaptive; Code; Division; Multiple; Access

9505887 Wicker This work includes an investigation into the application of adaptive error control schemes for CDMA systems. As the number of users increases, automatic retransmission requests will be used to automatically increase the amount of controlled redundancy accompanying all data transmissions. The throughput and reliability performance of the adaptive CDMA system will degrade gracefully as the number of active users increases. Acceptable levels of throughput and reliability performance will thus be provided well beyond the point at which a conventional CDMA system would have collapsed. The research program will examine the incorporation of adaptive algorithms into the convolutional and Reed-Solomon error control systems currently used with CDMA systems. Research will also include more innovative schemes that make use of channel estimation techniques based on side information generated by error control decoders to create intelligent random access networks. ***

这项工作包括研究自适应误差控制方案在CDMA系统中的应用。随着用户数量的增加，将使用自动重传请求来自动增加伴随所有数据传输的可控冗余量。自适应CDMA系统的吞吐量和可靠性性能会随着活跃用户数的增加而优雅地下降。因此，可接受的吞吐量和可靠性性能水平将远远超过传统CDMA系统崩溃的程度。该研究计划将研究将自适应算法纳入目前用于CDMA系统的卷积和里德-所罗门误差控制系统。研究还将包括更多的创新方案，利用基于错误控制解码器产生的侧信息的信道估计技术来创建智能随机接入网络。＊＊＊