Power Efficient Back-Off Reduction through Polyphase Filtering Magnitude Modulation
; Tomlinson, M.
IEEE Communications Letters Vol. 13, Nº 8, pp. 606 - 608, August, 2009.
ISSN (print): 1089-7798
ISSN (online): 1089-7798
Journal Impact Factor: 1,268 (in 2014)
Digital Object Identifier: 10.1109/LCOMM.2009.082112
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A multistage polyphase magnitude modulation (MPMM) technique is proposed for single carrier (SC) modulations, to efficiently reduce the peak-to-average power ratio (PAPR) of the bandwidth limited signal resulting from root-raised cosine (RRC) filtering. We show that the application of back-off to the transmitter high-power amplifier (HPA), in order to avoid nonlinear distortion and thus spectral regrowth, can be almost eliminated, even at very low roll-off values, leading to system’s high power efficiency. We also show that noise sensitivity due to MPMM is considerably minimized by improving the initial receiver’s soft-decoding estimates, based on the average positions of the MPMM constellation symbols.