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The authors present and analyze several adaptive modulation schemes for wireless multihop systems with regenerative relays. In particular, they consider both rate adaptation based on perfect channel state information (csi) of all hops as well as suboptimal strategies based on partial csi, which require only a very limited amount of feedback information and hence represent attractive approaches for practical systems. They thoroughly investigate the performance of all proposed schemes in terms of the average spectral efficiency as well as the average bit error rate, considering the important case of a Rayleigh-fading environment and M-ary quadrature amplitude modulation as a concrete example.
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