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Widely linear channel estimation for LD‐STBC MB‐OFDM UWB systems
Author(s) -
Hajjaj Moufida,
Chainbi Walid,
Bouallegue Ridha
Publication year - 2016
Publication title -
international journal of communication systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.344
H-Index - 49
eISSN - 1099-1131
pISSN - 1074-5351
DOI - 10.1002/dac.3159
Subject(s) - orthogonal frequency division multiplexing , computer science , space–time block code , estimator , algorithm , channel (broadcasting) , mimo , minimum mean square error , block code , bit error rate , telecommunications , mathematics , decoding methods , statistics
Summary The combination of Linear Dispersion Space‐Time Block Codes (LD‐STBCs) and Multiband Orthogonal Frequency Division Multiplexing Ultra‐WideBand (MB‐OFDM UWB) technologies has been proposed in the literature to improve the error performance and data rate. Recently, it has been shown that the LD codes allow the repetitions of data symbols conjugates. They cause a transformation of the Multiple‐Input Multiple‐Output (MIMO) channel that requires a Widely Linear (WL) filtering. However, proposed LD‐STBC MB‐OFDM UWB system does not take this issue into account. In this paper, we propose a Widely Linear Minimum Mean Square Error (WLMMSE) channel estimator for LD‐STBC MB‐OFDM UWB systems. The proposed channel estimator proceeds to WL estimation instead of linear one. Via simulation results, we prove that the LD‐STBCs provide significant performance gain for MB‐OFDM UWB system compared to Single‐Input Single‐Output (SISO) configuration. We show also that the proposed WLMMSE channel estimator outperforms the LMMSE one. This performance improvement is observed for both proper and improper signal constellations. Additionally, the computational complexity of our proposal is comparable with that of LMMSE estimator. Copyright © 2016 John Wiley & Sons, Ltd.