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Compressive sensing (CS) based sparse channel estimation requires optimal pilot patterns, whose corresponding sensing matrices should have small mutual coherences, so as to efficiently exploit the inherent channel sparsity. For the purpose of minimizing the mutual coherence of the sensing matrix, we introduce a new estimation of distribution algorithm (EDA) to optimize the pilot pattern so as to improve...
Single-carrier with frequency domain equalization (SC-FDE) has been considered for bandwidth efficiency underwater acoustic (UWA) communication recently due to its reduced computational complexity and low peak-to-average power ratio. A multi-channel time-frequency domain equalization method for pseudurandom noise (PN) based SC-FDE is proposed in this paper. The proposed equalizer includes a multi-channel...
Channel estimation provides channel state information (CSI) for equalizing channel distortion and demodulating received signals. As a consequence, this technique takes an important part in modern wireless communications systems. Comparing with conventional pilot-aided channel estimators, compressive sensing based channel estimation methods can exploit the sparse property of the wireless channel and...
The performance of frequency-domain equalization in a SC-FDE system is affected by the precision of channel estimation results and estimation methods based on compressive sensing have better performance in sparse channel condition such as underwater acoustic communication channels. However, the commonly used greedy algorithm in sparse channel estimation requires the sparsity to terminate the recursive...
In this paper, under Doppler spread channel, in order to reduce the error of channel estimation caused by Doppler spread, the optimal pilot tones is proposed with respect to the mean square error (MSE) of least square (LS) channel estimation in the wireless orthogonal frequency division multiplexing (OFDM) systems. It is shown that the phase shift is needed based on conventional equipowered, equispaced...
In this paper, we propose a least squares (LS) channel estimation scheme in time domain for MIMO-OFDM systems based on pilot tones. The basic idea is that time-domain signals generated by pilots of transmitter and receiver are used to estimate the time-domain channel responses. Optimal pilot sequences (OPS) with regard to (w.r.t) the mean square error (MSE) of LS channel estimation are also presented;...
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