Performance analysis of Orthogonal-frequency-division-multiplexing (OFDM) based on Channel Estimation Technique

Abstract

In order to achieve the potential advantages of OFDM based systems, the channel coefficients should be estimated with minimum error. Orthogonal frequency division multiplexing (OFDM) is a method to transmit multi carrier in wireless environment, and can also be seen as a multi-carrier digital modulation or multicarrier digital multiplexing technology. Channel estimation plays a vital role in OFDM system. The channel estimation technique that can be pilot based or blind based can be helpful to improve the performance of OFDM system. The channel estimation technique for OFDM systems based on pilot arrangements is investigated. A different algorithm for both estimating channel at pilot frequencies and interpolating the channel is performed. The Performance comparison of all schemes by measuring bit error rate and mean square error using different modulation techniques like QPSK, and 16-QAM is discussed. Simulation results show the performance of different type channel estimation techniques under various channel condition and modulation technique.