New Sequential Techniques for Code Acquisition in Wireless CDMA Systems

这项研究包括四个主要目标：(1)开发强大、快速、混合的捕获方案，设计用于在含有多址干扰、衰落和多径的信道中工作。这些方案将被设计为即使在恶劣的信道条件下也能快速而可靠地获取信号。(2)建立了一类新的基于流水线的序贯多假设检验，这是一种类似于并行服务排队系统的范例。(3)开发利用多径存在的捕获方案。(4)第三代蜂窝通信系统中基于捕获的直接序列码分多址通信容量和分组数据码分多址捕获受限吞吐量的确定。研究中寻求序列决策理论的重大进展，其结果将适用于从多分辨率雷达系统到PCS系统的各种系统。

This research consists of four major objectives: (1) The development of powerful, rapid, hybrid acquisition schemes designed to operate in channels containing multiple-access interference, fading, and multipath. These schemes will be designed to acquire signals rapidly and reliably even under severe channel conditions. (2) The creation of a new class of sequential multihypothesis tests based on pipelining, a paradigm akin to a parallel server queueing system. (3) The development of acquisition schemes that exploit the presence of multipath. (4) A determination of the acquisition-based capacity of direct sequence CDMA communications and the acquisition-limited throughput of packet-data CDMA in third generation cellular communications systems. Significant advances in sequential decision theory are sought in the study, and the results will be applicable to systems ranging from multiple-resolution radar systems to PCS systems.