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Zero-Padded Conjugate Transmission to Cancel ICI in OFDM System

Affiliations

  • Electronics and Communication Engineering Department, Lovely Professional University, Phagwara - 144806, Punjab,, India

Abstract


In OFDM (Orthogonal Frequency Division Multiplexing) to minimize effect of Inter-carrier interference the proposed technique Conjugate transmission with Zero padding and adaptive receiver is proposed in this research article. To transmit the signal according to proposed scheme, first regular OFDM signal is transmitted as a signal in the first path and conjugate signal of regular OFDM is transmitted using proposed algorithm in second path. Two consecutive symbols of the proposed OFDM signal is transmitter after padding Zeros between them to minimize the effect of inter-carrier interference forbetter time and frequency synchronization between transmitter and receiver signal. To adaptively update the frequency offset error receiver is designed with block least mean-squared algorithm (BLMS). BPSK, QPSK and 16-QAM modulation techniques are used and simulation results are carried out using MATLab software. Simulation results for proposed scheme are compared with regular OFDM system, Conjugate Cancellation (CC) and Phase Rotation Conjugate technique(PRCC) with reference to BER and simulation graphs shows that proposed scheme shows better BER rate performance as comparison to conventional techniques for AWGN wireless channel.

Keywords

Adaptive Receiver, Block Least Mean-Squared (BLMS) Algorithm, Inter-Carrier Interference (ICI), Orthogonal Frequency Division Multiplexing (OFDM).

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