A Digital Pre-Distortion Scheme for CMMB Repeater System Based on Dynamic Neural Networks

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Abstract:

CMMB technology employs Orthogonal Frequency Division Multiplexing (OFDM) modulation with 4096 subcarriers for 8MHz bandwidth mode, HPA in the CMMB repeater will cause significant distortion and spectral extension. To compensate HPA nonlinearity and memory effect in a CMMB repeater system, this paper proposed a pre-distortion scheme based on RNN and Bayesian Regularization for the first time. Computer simulation is used to confirm the validation of the proposed scheme and an adjacent channel leakage ratio (ACLR) improvement of 20 dB is obtained in the paper.

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1738-1743

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July 2013

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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