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Stepped θ-QAM for high-order modulation

Stepped θ-QAM for high-order modulation

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M-ary stepped θ-QAM (θ-QAM) for M = 22l , l ≥ 3 based on square QAM is proposed. The signal constellation of stepped θ-QAM and the coordinates of the symbols generalised for modulation order M are presented. Then analyse the symbol error rate (SER) performance, and the optimum value of θ in terms of minimum SER for stepped θ-QAM in additive white Gaussian noise and fading channels. Through computer simulations, the theoretical results are validated and show that stepped θ-QAM offers better error performance than θ-QAM.

References

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      • A. Awadalla , K.T. Wu , D. Yevick .
        4. Awadalla, A., Wu, K.T., Yevick, D.: ‘Comparison between square and stepped-square QAM for optical transmission’. Optical Fiber Communication Conf., California, USA, 2015.
        . Optical Fiber Communication Conf.
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2017.3175
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