Abstract:

The statistical characteristic of orthogonal frequency division multiplexing(OFDM) frequency domain channel is analyzed at first. Aiming at the peculiarity of high-speed mobile and transmitting of OFDM signal, a finite-state Markov channel model (FSMM)is formed to represent OFDM frequency domain channel which is modeled as Nakagami-m fading distribution random process that is used in modeling mobile channel more and more widely. The methodology is developed and analyzed to partition the received signal-to-noise ratio into a finite number of states according to the same duration of each state. The method of computing the duration, the threshold , the number of states and the transition probability as well as the average error probability of state is given and the close solution when m is equal to 0.5 or 1 or 2.This model can provide the good base of adaptive modulation and coding and automatic repeat request as well as dynamic resource allocation. The computation results is according to computer simulation results, which verify the accuracy of the model.

Key words: finite-state Markov model, frequency model of orthogonal frequency division multiplexing, Nakagami-m distribution, the same time of duration, finite state Markov model of frequency domain channel