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In the digital video broadcasting-second generation terrestrial standard, the constellation rotation and cyclic Q-delay techniques have been adopted to improve the bit error rate performance in fading channels. However, they would lead to a substantially increased demapping complexity at the receiver. In order to reduce the demapping complexity, we propose a switched soft demapper, where different...
In this paper, we propose a low-complexity switched soft demapper for rotated non-uniform constellation (e.g., nonuniform QAM, non-uniform APSK) DVB-NGH systems. The constellation would be twisted seriously through an I/Q independent fading channel. The requirement for two-dimensional (2D) soft demapping leads to the exponentially increased complexity. The proposed demapper classifies the received...
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