VI. CONCLUSION
In this paper, we evaluated the performance of turbo code
based AdaptiveModulation and Coding in 3G wireless systems.
We proposed a new method for selecting the appropriate Modulation
and Coding Scheme according to the estimated channel
condition where we use a first-order Markov model to represent
the average channel SNR and we take a statistical decision
making approach to address the issue caused by the sensitivity
of turbo code to the errors in predicting the channel
SNR. Numerical results are presented showing that our method
substantially outperforms the conventional techniques that use
a “threshold-based” decision making approach. We also propose
a Simplified Model with fewer parameters which is suitable
in systems where changes in the fading characteristics need
to be accounted for in an adaptive manner. It is shown that the
Simplified Model only results in negligible loss in the expected
throughput.