Advanced signal processing for MIMO cooperative communication

众所周知，多输入多输出（MIMO）技术可以给无线系统带来许多好处，如增加信道容量和提高传输可靠性。尽管MIMO有许多优点，但在实际无线移动环境中的应用仍面临一些困难。主要的挑战是，由于复杂的环境和信道的时变特性，源和目的地之间的无线链路经常经历严重的阴影衰落和路径损失。另一个限制是移动终端中有限的电池电量，严重影响无线传输性能和链路容量。为了克服这些限制，协作式MIMO通信，即在MIMO系统中使用中继，最近被提出作为下一代移动通信系统的有效解决方案。

It is well known that the multi-input multi-output (MIMO) technology can bring into wireless systems many benefits such as increasing the channel capacity and enhancing the transmission reliability. Despite many merits of MIMO, its use in practical wireless mobile environments faces some difficulties. The main challenge is that the wireless link between a source and its destination often experiences severe shadow fading and path loss due to the complicated environment and the time-varying nature of the channel. Another restriction is the limited battery power in mobile terminals that affects severely the wireless transmission performance and link capacity. To overcome these limitations, cooperative MIMO communication, namely, using relays in MIMO systems, has recently been proposed as an efficient solution to next-generation mobile communication systems.