High Bandwidth Efficient Schemes for Portable Multimedia Communications

高带宽效率的便携式多媒体通信方案。针对移动用户的多媒体服务的引入导致卫星频谱短缺。点波束技术用于在用户密度高的地区提供服务。相邻重叠波束被分配不同的频带，然而来自相邻波束的干扰限制了容量。多用户检测是一种能够通过在相邻光斑波束中重复使用频率来显著增加容量的技术。本项目的目的是研究多用户点波束信道的接收机设计，并开发相关的同步和信道估计方法。其结果将是高效的通信系统支持更高的用户群，而不增加所需的带宽。

High Bandwidth Efficient Schemes for Portable Multimedia Communications. The introduction of multimedia services for mobile users has resulted in a shortage of satellite spectrum. Spot beam technology is used to provide service in areas of high user density. Adjacent overlapping beams are allocated different frequency bands, however interference from neighbouring beams limits capacity. Multi-User Detection is a technology capable of significantly increasing capacity by frequency re-use in adjacent spot beams. The aim of this project is to investigate receiver design for multi-user spot-beam channels and develop associated synchronisation and channel estimation methods. The outcome will be efficient communications systems supporting higher user populations, without increasing the bandwidth required.