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The previous link adaptation algorithms on ofdm based systems use equalmodulation order for all sub carrier index within a block. For multimediatransmission using ofdm as the modulation technique, unequal constellation isused within one ofdm subcarrier block, a set of subcarriers for audio andanother set for video transmissions. A generic model has been shown for such atransmission and link adaptation algorithm has been proposed using EESM(Effective Exponential SNR mapping) method as basic method. Mathematical modelhas been derived for the channel based on bivariate Gaussian distribution inwhich the amplitude varies two dimensionally in the same envelope. From theMoment generating function of bivariate distribution, Probability of error hasbeen theoretically derived. Results have been shown for BER performance of anofdm system using unequal constellation. BER performances have been shown fordifferent values of correlation parameter and fading figure.

Modified EESM Based Link Adaptation Algorithm for Multimedia Transmission in Multicarrier Systems