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User cooperation is a well-known approach to achieve diversity withoutmultiple antennas, however at the cost of inevitable loss of rate mostly due tothe need of additional channels for relaying. A new collaborative diversityscheme is proposed here for multiple access fading channels to attain full ratewith near maximum diversity. This is achieved by allowing two users and theircorresponding relays to transmit/forward data on the same channel by exploitingunique spatial-signatures of their fading channels. The base-station jointlydetects the co-channel users' data using maximum-likelihood search algorithmover small set of possible data combinations. Full data rate with significantdiversity gain near to two-antenna Alamouti scheme is shown.

Full Rate Collaborative Diversity Scheme for Multiple Access Fading Channels