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In this work, we propose buffer-aided distributed space-time coding (DSTC)schemes and relay selection algorithms for cooperative direct-sequencecode-division multiple access (DS-CDMA) systems. We first devise a relay pairselection algorithm that can form relay pairs and then select the optimum setof relays among both the source-relay phase and the relay-destination phaseaccording to the signal-to-interference-plus-noise ratio (SINR) criterion.Multiple relays equipped with dynamic buffers are then introduced in thenetwork, which allows the relays to store data received from the sources andwait until the most appropriate time for transmission. { A greedy relay pairselection algorithm is then developed to reduce the high cost of the exhaustivesearch required when a large number of relays are involved.} The proposedtechniques effectively improve the quality of the transmission with anacceptable delay as the buffer size is adjustable. An analysis of thecomputational complexity of the proposed algorithms, the delay and a study ofthe greedy algorithm are then carried out. Simulation results show that theproposed dynamic buffer-aided DSTC schemes and algorithms outperform prior art.

Review of Buffer-Aided Distributed Space-Time Coding Schemes and Algorithms for Cooperative Wireless Systems