Multiuser digital wireless communications systems

拟议的研究计划侧重于新颖和实用的自适应信号处理和多址技术，有效的无线接入多媒体通信服务。它适用于“下一代”无线系统（超越目前新兴的第三代系统）。这些技术应用到下一代无线系统将提供无处不在的数据速率远高于今天的无限制接入。拟议的研究是一个持续的研究计划，其主要目标是设计，改进和评估手段，以适应大和可变比特率用户密度与现实的带宽，功率和成本的限制。设想的流量包括宽带多媒体服务、IP语音以及与无数小型传感器设备之间的通信。发射机和接收机的自适应空间、时间和频率分集处理，以及用户终端之间的智能中继、合作分集和认知智能无线电频谱共享等技术，将有助于实现这一目标。

The proposed research program focuses on novel and practical adaptive signal processing and multiple access techniques for efficient wireless access to multimedia communications services. It applies to the "next generation" of wireless systems (beyond the currently emerging third generation systems). These techniques applied to next generation wireless systems will provide ubiquitous untethered access at data rates far higher than today's.The proposed research is part of a continuing research program whose main objective is to devise, improve and evaluate means to accommodate large and variable bit rate subscriber densities with realistic bandwidth, power and cost constraints. The envisioned traffic includes broadband multimedia services, voice over IP, and communications to and from myriad small sensor devices. It will be facilitated by adaptive space, time and frequency diversity processing at transmitters and receivers, and by techniques like intelligent relaying, cooperative diversity and cognitive intelligent radio spectrum sharing among user terminals.