BER analysis of OFDM receiver using MMSE channel estimation and modified PTS combined with interleaving

Orthogonal Frequency Division Multiplexing is a highly flexible multicarrier modulation technique adapted in frequency selective and time variant wireless channels. In spite of its many advantages, OFDM suffers from high PAPR. Many methods of PAPR reduction techniques have been proposed. Of these, PTS is a distortion-less method of PAPR reduction. But PTS involves more computational complexity with increase in subblocks. To address the issue of high computational complexity, Modified PTS is used. Modified PTS is based on neighbourhood search algorithm, wherein a threshold PAPR is assumed to search the optimum set of phase factors. The optimum set of phase factors are then used to obtain OFDM signal with low PAPR. By combining Modified PTS and interleaving, a further reduction in PAPR is achieved. In this paper, the performance of OFDM receiver is analyzed using MMSE channel estimation. The parameters MSE and BER are used to evaluate the performance of MMSE OFDM receiver. Simulation results show that BER performance improves with reduction in PAPR.