On Distorted Constellations of 16-Ary Modulation Schemes

Sangtae KIM  Wonjin SUNG  

IEICE TRANSACTIONS on Communications   Vol.E91-B   No.5   pp.1632-1635
Publication Date: 2008/05/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.5.1632
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
QAM,  APSK,  saturation,  distorted constellation,  nonlinear channels,  

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In this letter, the effect of distorted constellation shapes of 16-ary modulation due to the power saturation channel is analyzed. In particular, error bounds for 16-QAM and 16-APSK with distorted constellations are derived, and optimal operating points in terms of Es/N0 are presented. The result can be used to accurately predict the performance of these modulation schemes with a given level of the constellation distortion, as well as to determine the amount of input power to the saturation channel which minimizes the probability of modulation symbol error.