Research Initiation: Robust Communication and Generalized Spread-Spectrum Systems

研究的目的是建立基本的设计原则，以实现在被热噪声和未知的有限功率干扰信号破坏的信道上，使用伪随机通信系统进行鲁棒通信。这项工作将补充和扩展目前使用错误控制编码、交错和扩频调制的通信研究。这些系统是本研究项目中所考虑的特殊情况。讨论了两个一般性问题。第一个目的是建立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（抗干扰）应用的背景下解决。这个问题的一个关键方面是量化交叉在健壮系统中的作用。在本研究的第二部分，首席研究员将介绍并研究一类新的鲁棒编码系统的结构和性能，称为伪随机码，它将编码系统与交错和扩频调制进行了推广。在扩频中，这些码是由伪随机参数驱动的；但是，编码、交织和频谱扩展是同时进行的。理论结果表明，在某些情况下，在相同的功耗、带宽和复杂性下，该编码族中的一些编码增益远远大于扩频技术。//

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.//