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Differential spatial multiplexing techniques for high spectrum efficiency on very fast fading MIMO links

差分空间复用技术可在极快衰落的 MIMO 链路上实现高频谱效率

基本信息

批准号：
EP/E03571X/1
负责人：
Alister Burr
金额：
$ 10.8万
依托单位：
University of York
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2007
资助国家：
英国
起止时间：
2007 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FE03571X%2F1
关键词：
Differential spatial multiplexing techniques spectrum

项目摘要

Spatial multiplexing (sometimes referred to as 'BLAST') is a way to increase the throughput of a wireless system by exploiting multiple antennas at both transmitter and receiver (MIMO) - potentially it can increase capacity by a factor equal to the minimum of the number or transmit and receive antennas. However it requires the receiver to estimate the exact characteristics of the channel, which is difficult when the channel varies (fades) very rapidly, as in mobile communcation at high speeds. Differential techniques have been developed for single antenna systems and for space-time coded MIMO systems (which do not increase capacity), which avoid the need to estimate the channel by sending information as the difference between one transmitted symbol and the next. However this has not previously been possible for spatial multiplexing. The proposers have developed a technique which allows this, but the current scheme suffers from poor diversity, resulting in less robust communication, and requires high complexity at the receiver. The proposed research is intended as a feasibility study to determine whether these problems can be mitigated, using appropriate mapping schemes at the transmitter and techniques such as sphere decoding or SGA at the receiver, or using FEC coding with iterative decoding. It will also examine potential applications, including techniques like CDMA and OFDM to enable its use on a multi-user wideband channel.

空间复用（有时称为“BLAST”）是通过在发射机和接收机（MIMO）处利用多个天线来增加无线系统的吞吐量的方式-潜在地，它可以将容量增加等于发射天线和接收天线的数量的最小值的因子。然而，它要求接收机估计信道的精确特性，当信道变化（衰落）非常快时，如在高速的移动的通信中，这是困难的。已经为单天线系统和空时编码MIMO系统（其不增加容量）开发了差分技术，其避免了通过发送作为一个发送符号与下一个发送符号之间的差的信息来估计信道的需要。然而，这在以前对于空间复用是不可能的。提议者已经开发出一种允许这种情况的技术，但是当前方案的分集较差，导致通信不太鲁棒，并且在接收机处需要高复杂度。拟议的研究是作为一个可行性研究，以确定是否可以减轻这些问题，使用适当的映射方案在发射机和技术，如球解码或SGA在接收机，或使用FEC编码与迭代解码。它还将研究潜在的应用，包括CDMA和OFDM等技术，使其能够在多用户宽带信道上使用。