Abstract
This letter presents a novel design of high rate complementary code keying (CCK) modulation scheme (named QAM-CCK) that is suitable for bandwidth efficient wireless link adaptation. The proposed QAM-CCK can increase the bandwidth efficiency of CCK signaling by simultaneously implementing quadrant and phase modulations. We introduce an optimal design criterion based on weighted minimum Euclidean distance to optimize the QAM-CCK mapping with minimum average bit error probability. In order to utilize the inherent coding gain of QAM-CCK, we propose an iterative soft maximum likelihood receiver to enhance the decoding performance. Compared with traditional QPSK of the same bandwidth efficiency, the proposed QAM-CCK achieves a 4-dB SNR gain under additive white Gaussian noise channels when used in conjunction with proposed iterative receiver.
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