a general analytical framework for system throughput performance of adaptive coded modulation is proposed.Each coded modulation scheme is assigned with a certain range of average channel signal to noise ratio (SNR) based on bit error rate (BER) performance of each fixed coded modulation scheme.With the method of Lagrange
the SNR switching thresholds for throughput maximization of adaptive system are derived and the average throughput performance of the adaptive system is obtained.It is shown in our numerical results that significant improvements of system throughput performance of the adaptive Turbo-coded MQAM modulation over adaptive MQAM modulation have been achieved and the throughput performance is insensitive to the instantaneous BER requirement.For the same average channel SNR in Nakagami channel
less improvement of the throughput performance is observed with the increase of m.