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In this work, we propose buffer-aided physical-layer network coding (PLNC)techniques for cooperative direct-sequence code-division multiple accesssystems. In the proposed buffer-aided PLNC schemes, a relay pair selectionalgorithm is employed to obtain the relay pair and the packets in the bufferentries with the best performance and the associated link combinations used fordata transmission. We also devise PLNC schemes based on the design of linearnetwork coding matrices using maximum likelihood and minimum mean-square errorcriteria to generate the network coded symbols that are sent to thedestination. Simulation results show that the proposed techniques significantlyoutperform prior art.

Study of Buffer-aided physical-layer network coding with ML and MMSE linear code designs for cooperative DS-CDMA systems