New Sequential Techniques for Code Acquisition in Wireless CDMA Systems

本研究包括四个主要目标：(1)开发强大、快速、混合采集方案，设计用于在包含多址干扰、衰落和多径的信道中运行。这些方案将被设计成即使在恶劣的信道条件下也能快速可靠地获取信号。(2)创建一类新的基于流水线的顺序多假设检验，这是一种类似于并行服务器排队系统的范式。(3)开发利用多路径存在的获取方案。(4)确定第三代蜂窝通信系统中直接序列CDMA通信的基于获取的容量和分组数据CDMA的获取限制吞吐量。在序贯决策理论的重大进展寻求在研究中，其结果将适用于系统范围从多分辨率雷达系统到PCS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.