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Sparse channel estimation of pulse-shaping multiple-input–multiple-output orthogonal frequency division multiplexing systems with an approximate gradient l2 – Sl0 reconstruction algorithm

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2 Author(s)
Xinrong Ye ; Inst. of Signal Process. & Transm., Nanjing Univ. of Posts & Telecommun., Nanjing, China ; Wei-Ping Zhu

Most of the existing compressed channel-sensing methods for multiple-input-multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems did not take into account the pulse-shaping filter in the transmitter and matched filter in the receiver. However, these two filters are commonly used in digital communication systems. The compressed channel-sensing problem of pulse-shaping MIMO-OFDM systems is first formulated. A new signal-reconstruction algorithm in the compressed sensing framework is then proposed. The algorithm is based on minimising a smoothed l0-norm regularised least-square (LS) (l2 - Sl0) objective function, and the unconstrained optimisation involved is performed by an approximate gradient method. Further, the proposed l2 - Sl0 algorithm is applied to reconstruct the channel impulse response. A number of computer simulation-based experiments are conducted, showing a better reconstruction accuracy of the l2 - Sl0 algorithm as compared with the smoothed l0-norm (Sl0) algorithm. The proposed channel estimation approach can save nearly 25% pilot signals to maintain the same mean square error and bit error rate performances as given by the conventional LS method.

Published in:

Communications, IET  (Volume:8 ,  Issue: 7 )