An improved design criterion for distributed space-time trellis codes with amplify-and-forward relaying for the case of one relay is derived. The codes found by the new criterion are compared to conventional codes, and the results show that the new codes provide a performance gain over the conventional codes.rnCo-operative diversity technology is one of the most promising technologies to increase channel capacity and overcome interference. The concept of the co-operative relay is analogous to conventional multiple-input multiple-output (MIMO) technology, where similar technologies can be applied when we consider a relay as a single antenna in conventional MIMO diversity technologies.
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