Coding and Collision Resolution in Multiple Access Communications

[217457]休斯本研究计划的目标是结合多用户编码和冲突分辨率，设计多址通信系统，有效、可靠地传输数据，并具有可容忍的延迟。讨论了两个一般性问题。第一个问题是将代码分配给一组M个潜在用户，允许这些用户的任何子集合同时可靠地传输至多T个用户。这项工作将探索信息理论所施加的限制以及新代码的设计。本研究的第二部分介绍了一种新的多址方案，称为协议分多址，它结合了多用户编码、冲突解决和码分多址等方面。初步结果表明，对于给定的吞吐量，PDMA可以显著减少具有长传播延迟的信道（例如卫星链路）上的消息延迟。＊＊＊

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). ***