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Diversity in Cooperative Networks: How to Achieve and Where to Exploit?
, 2008
"... Recently, there has been much interest in modulation techniques to achieve transmit diversity motivated by the increased capacity of multiple-input multiple-output (MIMO) channels. To achieve transmit diversity the transmitter needs to be equipped with more than one antenna. The antennas should be w ..."
Abstract
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Recently, there has been much interest in modulation techniques to achieve transmit diversity motivated by the increased capacity of multiple-input multiple-output (MIMO) channels. To achieve transmit diversity the transmitter needs to be equipped with more than one antenna. The antennas should be well separated to have uncorrelated fading among the different antennas; hence, higher diversity orders and higher coding gains are achievable. It is affordable to equip base stations with more than one antenna, but it is difficult to equip the small mobile units with more than one antenna with uncorrelated fading. In such a case, transmit diversity can only be achieved through user cooperation leading to what is known as cooperative diversity. Cooperative diversity provides a new dimension over which higher diversity orders can be achieved. In this thesis, we consider the design of protocols that allow several terminals to cooperate via forwarding each others’ data, which can increase the system reliability by achieving spatial cooperative diversity. We consider the problem of “how to achieve and where to exploit diversity in cooperative networks?” We first