Adaptive peak suppression for power and bandwidth efficient linear modulation
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This paper looks into modulation formats which minimize peak power and retain high spectral efficiency. Peak power is broken into a sum (in terms of dB) of average power and a peak-to-average power ratio. A generalized PSK constellation is considered as an alternative to 16QAM. This scheme is found to be about 0.8dB better (in terms of peak power) than 16QAM for a Gaussian noise channel and 1.2dB superior for a Rayleigh fading channel. Also, an adaptive peak suppression algorithm is presented which further reduces the peak-to-average power ratios of the PSK and generalized PSK formats. It was found that using this scheme on the generalized PSK format produced a 4 bit/symbol modulation technique which was 2.2dB superior to 16QAM in terms of peak power over a Rayleigh fading channel. The peak suppression algorithm is also applicable to /4-QPSK and was found to improve peak power efficiency of that format by about 1.25dB over a Rayleigh fading channel.
