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Emerging broadband wireless applications in most wireless networks require increasingly high throughput and more stringent Quality-of-Service (QoS) requirements. In this respect, multiple-antenna technologies have been recognized as important solutions for future high-speed wireless networks. Particularly, employment of multiple antennas at transmitter and/or receiver sides can provide significant multiplexing and/or diversity gains. The net effects of these gains are the improvements in terms of wireless link robustness (i.e., lower Bit Error Rate (BER)) and network capacity. Unfortunately, the implementation of multiple antennas in most modern mobile devices may be challenging due to their small sizes. Cooperative diversity has been proposed as an alternative solution where a virtual antenna array is formed by distributed wireless nodes each with one antenna.
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