Efficient link adaptation in OFDM systems using a hybrid intelligent technique

Adaptive communication for rate enhancement and link survival is a recent area of interest. In adaptive communication, transmission parameters like transmit power, code rate and modulation scheme are chosen in an adaptive manner to match the link conditions and quality of service demand at that transmission interval. But this is a highly non linear phenomenon and a constrained optimization problem. In this paper, we have investigated Simulated Annealing algorithm in conjunction with a fuzzy rule base system (SAFRBS) for adaptive coding, modulation and power in an orthogonal frequency division multiplexing environment. The cases of fixed and adaptive communication are compared and results are shown through the simulations.