Adaptive Code Division Multiple Access Systems

9505887威克这项工作包括研究自适应差错控制方案在码分多址系统中的应用。随着用户数量的增加，自动重传请求将用于自动增加伴随所有数据传输的受控冗余量。随着活跃用户数的增加，自适应码分多址系统的吞吐量和可靠性性能将急剧下降。因此，可接受的吞吐量和可靠性性能水平将远远超出传统的码分多址系统崩溃的程度。该研究计划将研究将自适应算法纳入目前用于码分多址系统的卷积和里德-所罗门差错控制系统。研究还将包括更具创新性的方案，这些方案利用基于差错控制解码器产生的边信息的信道估计技术来创建智能随机接入网络。***

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. ***