Method and apparatus for a simplified maximum likelihood demodulator for dual carrier modulation
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United States of America Patent
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Issued Date -
Dec 18, 2008
app pub date -
Jun 14, 2007
filing date -
Jun 14, 2007
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Abandoned
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Abstract
A novel method and apparatus for wireless communication systems for simplifying the maximum likelihood (ML) Dual Carrier Modulated (DCM) demodulation for received DCM signals over frequency selective channels are disclosed. The disclosed method and apparatus are based on the Minimum Euclidean Distance (MED) decoding, which is equivalent to the maximum likelihood (ML) decoding for a frequency-selective wireless channel with Additive White Gaussian Noise (AWGN). Compared to the traditional ML decoder, the disclosed method and apparatus reduce the hypothesis testing from that of a 16 Quadrature Amplitude Modulation (16 QAM) to that of a 4 QAM, or Quadrature Phase Shift Keying (QPSK). Thus computation and hardware complexity can be reduced.
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