Coding and Collision Resolution in Multiple Access Communications

小行星9217457 本研究计画的目标是将联合收割机多使用者编码与碰撞解决结合起来，设计出能有效、可靠且具有可容忍延迟的多址通讯系统。 两个一般性问题得到解决。 第一个问题是将代码分配给一组M个潜在用户，允许这些用户中多达T个的任何子集同时可靠地传输。 这项工作将探讨信息理论以及新的代码的设计所施加的限制。 本研究的第二部分介绍了一种新的多址接入方案，称为协议分多址，它结合了多用户编码，冲突解决，和码分多址方面。初步结果表明，对于一个给定的吞吐量，PDMA可以显着减少消息延迟信道长传播延迟（例如，卫星链路）。 ***

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). ***