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It has been shown that mobile-to-mobile (M2M) communications, where scatters are both around the transmitter and the receiver, may experience more severe channel fading than the fixed-to-mobile (F2M) communications. Double Nakagami-m fading is adopted to provide a realistic description of the M2M channel. By using the moment generating function (MGF) based approach, the exact symbol error rate (SER) expression, which can be numerically evaluated, is derived for the considered mobile-relay-based M2M system. Moreover, the asymptotic SER bound is provided at a high SNR regime for the insight of our approach. According to our analysis, an asymptotic diversity order of 2 × min(m1, m2) can be achieved in case of independent identically distributed (i.i.d) channels. Numerical studies illustrate that analytic results exactly match the simulations.