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Communication between mobile relays has recently gained much attention. In this paper, a novel optimal diagonal relay amplifying matrix based on the minimum mean square error (MMSE) criterion is proposed for mobile nodes. It is also designed for noncooperative distributed wireless mobile nodes under both no-jamming and jamming environments. An amplify and forward (AF) strategy is considered. The system under study has one-mobile-source, one mobile-destination and N-relay mobile nodes. System performance for the derived matrix was evaluated using bit error rate (BER). Performance comparisons under both no-jamming and jamming environments were a focus in this study.