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A variable-power(VP)adaptive modulation(AM)scheme with space-time block code(STBC)is developed in MIMO systems,and the corresponding performance is investigated in Nakagami fading channels.The optimum switching thresholds are derived so that the spectrum efciency(SE)under an average power and a target bit error rate(BER)constraint is maximized.By the switching thresholds,average BER and SE are further derived.As a result,closed-form expressions are obtained.Besides,the exact and approximate BER expressions of VP AM and constant-power(CP)AM systems with delayed feedback are respectively derived.Simulation results show that the theoretical SE and BER can match the corresponding simulation well.The results indicate that VP-AM with STBC provide higher spectrum efciency than the CP counterparts,and has slighter bite error rate performance degradation when the normalized delay is less than 0.01.
A variable-power (VP) adaptive modulation (AM) scheme with space-time block code (STBC) is developed in MIMO systems, and the corresponding performance is investigated in Nakagami fading channels. Optimal switching thresholds are derived so that the spectrum efciency (SE) under an average power and a target bit error rate (BER) constraint is maximized. By the switching thresholds, the average BER and SE are derived. As a result, closed-form expressions are obtained. BER expressions of VP AM and constant-power (CP) AM systems with delayed feedback are respectively derived. Simulation results show that the theoretical SE and BER can match the corresponding simulation well. The results indicate that VP-AM with STBC provide higher spectrum efciency than the CP counterparts, and has slighter bite error rate performance degradation when the normalized delay is less than 0.01.