Research Initiation: Robust Communication and Generalized Spread-Spectrum Systems

该研究的目的是建立基本的设计原则，以实现在被热噪声和有限功率的未知干扰信号污染的信道上使用伪随机通信系统进行稳健的通信。这项工作将补充和扩展目前使用差错控制编码、交织和扩频调制进行通信的研究。这类系统是本研究项目所考虑的系统的特例。本文讨论了两个一般性问题。第一个目标是确定伪随机通信系统提供的潜在编码增益。这个问题将在码分多址和干扰抑制(反干扰)应用的背景下解决。这个问题的一个关键方面是量化交织在健壮系统中的作用。在本研究的第二部分，主要研究人员将介绍和研究一类新的稳健编码系统的结构和性能，称为伪随机码，它推广了交织和扩频调制的编码系统。与在扩频中一样，这些代码由伪随机参数驱动；然而，编码、交织和频谱扩展同时执行。理论结果表明，在某些情况下，在相同的功率、带宽和复杂度下，这种码族中的一些码实现的编码增益远远大于使用扩频技术可以实现的编码增益。

The objective of the research is to establish basic design principles to achieve robust communication over channels corrupted by thermal noise and by unknown interfering signals of bounded power, using pseudo-random communication systems. This work will complement and extend current research on communication using error-control coding, interleaving and spread-spectrum modulation. Such systems are special cases of those considered in this research project. Two general issues are addressed. The first aims at establishing the potential coding gain offered by pseudo-random communication systems. This question will be addressed in the context of code-division multiple-access and interference suppression (anti-jamming) applications. A key aspect of this problem is to quantify the role of interleaving in robust systems. In the second part of this research, the principal investigator will introduce and examine the structure and performance of a new class of robust coding systems, called pseudo-random codes, which generalize coding systems with interleaving and spread-spectrum modulation. As in spread- spectrum these codes are driven by pseudo-random parameters; however, coding, interleaving and spectral spreading are performed simultaneously. Theoretical results show that within this family of codes are some that, in some situations, achieve coding gains much greater than those that can be achieved with spread-spectrum techniques for the same expended power, bandwidth and complexity.//