This dissertation develops energy-efficient algorithms that employ certain kinds of cooperation among terminals, and illustrates how one might incorporate these algorithms into various network architectures. In these techniques, sets of terminals relay signals for each other to create a virtual antenna array, trading off the costs—in power, bandwidth, and complexity—for the greater benefits gained by exploiting spatial diversity in the channel.By contrast, classical network architectures only employ point-to-point transmission and thus forego these benefits
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