A Joint MMSE Channel and Noise Variance Estimation for OFDM/OQAM Modulation

Abstract : This paper deals with the minimum mean square error-(MMSE-) based multipath channel and noise variance estimation in the case of a pilot-aided orthogonal frequency division multiplexing/offset quadrature amplitude modulation (OFDM/OQAM) system. The theoretical expression of the LMMSE channel estimation is formulated, and a simpler closed-form is derived. The MSE analysis shows that LMMSE inevitably reaches an error floor due to the interference inherent to OFDM/OQAM modulation. Furthermore, an algorithm for the joint MMSE estimation of both the channel and the noise variance (J-MCNE) is proposed, and features a reduced complexity thanks to the low-rank approximation method. The noise level estimation represents a challenge as it is concealed in the intrinsic interferences generated by the OFDM/OQAM. Simulations reveal the capability of the proposed J-MCNE method to estimate the noise variance, and show that the achieved bit error rate (BER) is close to that of the perfect estimation.
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Submitted on : Tuesday, October 20, 2015 - 11:07:45 AM
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Vincent Savaux, Faouzi Bader, Yves Louët. A Joint MMSE Channel and Noise Variance Estimation for OFDM/OQAM Modulation. IEEE Transactions on Communications, Institute of Electrical and Electronics Engineers, 2015, 2015 (99), pp.1-12. ⟨10.1109/TCOMM.2015.2476798⟩. ⟨hal-01202594⟩

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