Estimation and compensation of clipping noise in OFDMA systems

Authors:
Ying Chen;Jian Zhang;A. D. S. Jayalath
Affiliations:
Institute for Telecommunications Research, University of South Australia, Adelaide, Australia;Networked Systems, NICTA, Canberra and Australian National University;School of Engineering Systems, Queensland University of Technology, Queensland, Australia
Venue:
IEEE Transactions on Wireless Communications
Year:
2010

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Abstract

We propose an efficient and low-complexity scheme for estimating and compensating clipping noise in OFDMA systems. Conventional clipping noise estimation schemes, which need all demodulated data symbols, may become infeasible OFDMA systems where a specific user may only know his own modulation scheme. The proposed scheme first uses equalized output to identify a limited number of candidate clips, and then exploits the information on known subcarriers to reconstruct clipped signal. Simulation results show that the proposed scheme can significantly improve the system performance.