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While cooperative communication has many benefits and is expected to play animportant role in future wireless networks, many challenges are still unsolved.Previous research has developed different relaying strategies for cooperativemultiple access channels (CMA), cooperative multiple relay channels (CMR) andcooperative broadcast channels (CBC). However, there lacks a unifying strategythat is universally optimal for these three classical channel models.Sequential slotted amplify and forward (SSAF) strategy was previously proposedto achieve the optimal diversity and multiplexing tradeoff (DMT) for CMR. Inthis paper, the use of SSAF strategy is extended to CBC and CMA, and itsoptimality for both of them is shown. For CBC, a CBC-SSAF strategy is proposedwhich can asymptotically achieve the DMT upper bound when the number ofcooperative users is large. For CMA, a CMA-SSAF strategy is proposed which evencan exactly achieve the DMT upper bound with any number of cooperative users.In this way, SSAF strategy is shown to be universally optimal for all thesethree classical channel models and has great potential to provide universaloptimality for wireless cooperative networks.

On the Universality of Sequential Slotted Amplify and Forward Strategy in Cooperative Communications