Analytical estimation schemes for optical unipolar OFDM transmission over AWGN
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(Published version)
Date
2017
Authors
Mulinde, R.
Nguyen, K.D.
Cowley, W.G.
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Conference paper
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2013 National Conference on Communications, NCC 2013, 2017, pp.1-6
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IEEE International conference on communications (21 May 2017 - 25 May 2017 : Paris)
Abstract
In this paper, we present an analytical framework for detecting optical unipolar orthogonal frequency-division multiplexing (U-OFDM) signals. We derive analytical expressions for time-domain signal estimates based on different schemes including maximum likelihood, maximum a-posteriori and minimum mean-square error (MMSE) estimation. These schemes are compared with state-of-the-art U-OFDM detection schemes in terms of uncoded bit-error rate (BER). Numerical results show that the MMSE estimate-based scheme exhibits the least BER performance in the low signal-to-noise ratio (SNR) regime.Furthermore, we consider coded systems and reveal that the coded BER performance of the MMSE scheme is superior to previously proposed receivers. Finally, we propose an iterative decoding scheme with soft-symbol estimation to further improve the performance of coded U-OFDM.
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Copyright 2017 IEEE
Access Condition Notes: Accepted manuscript is available