Model based channel shortening technique for IEEE 802.11a OFDM system

Abstract

Channel shortening tehniques for IEEE802.11a OFDM system are studied. Their performance is evaluated for various standard channel models. A model based channel shortening technique is presented, which reduces the computational comlexity, both during initialization and data transmission. The method is based on modeling of channel impulse response by a pole-zero system, and using the denominator coefficients as the equalizer. Further, it is shown that for channel shortening, calculation of zeros of the model is not required. Comparison of proposed technique with MMSE and MSSNR channel shortening techniques is presented.