Coding and Collision Resolution in Multiple Access Communications

9217457休斯这个研究项目的目标是将多用户编码和冲突解决相结合，以设计高效、可靠和具有可容忍延迟的多址通信系统。本文讨论了两个一般性问题。第一个涉及将代码分配给M个潜在用户的组，这允许多达T个这些用户的任意子集合同时可靠地传输。这项工作将探索信息论施加的限制以及新码的设计。本研究的第二部分介绍了一种新的多址接入方案，该方案结合了多用户编码、冲突解决和码分多址技术。初步结果表明，对于给定的吞吐量，PDMA可以显著降低具有长传播时延的信道(例如卫星链路)上的消息时延。***

9217457 Hughes The goal of this research program is to combine multi-user coding and collision resolution to design multiple-access communicati on systems which convey data efficiently, reliably, and with tolerable delay. Two general issues are addressed. The first concerns the assignment of codes to a group of M potential users which permit any subcollection of up to T of these users to transmit reliably at the same time. This work will explore the limits imposed by information theory as well as the design of new codes. The second part of this research introduces a new multiple-access scheme called protocol division multiple-access which combines aspects of mutiuser coding, collision resolution, and code division multiple-access. Preliminary results suggest that, for a given throughput, PDMA can significantly reduce message delay on channels with long propagation delays (e.g. satellite links). ***