Performance Analysis and Optimization of the 16-QAM Modulation Scheme Using a Nonlinear Power Amplifier 


Vol. 27,  No. 9, pp. 847-855, Sep.  2002


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  Abstract

Due to its bandwidth efficiency, a number of communication systems have adopted QAM as their modulation method. Increasing demand for a higher data rate using a limited bandwidth makes QAM attractive for a wider range of applications including rate-adaptive wireless systems. Unlike PSK or FSK, the severe signal envelop fluctuations of QAM give the performance degradation when the modulation is combined with power-efficient nonlinear PAs (Power Amplifiers). In this paper, the performance of 16-QAM under nonlinear characteristics is analyzed, using a PA model having a constant saturated output power when the input signal exceeds a threshold. Approximated BER performance for 16-QAM combined with the nonlinear PA is derived, and compared with the simulation result to show its effectiveness. Closed-form BER expressions are presented using a varying signal constellation based on the input signal level, as is the case for real systems, which differentiates this work from previously reported results that give performance analyses for constellation with fixed level of distortion. It is shown that the optimal input signal level exists for a given PA power saturation value, and the minimal value of BER as well as the optimal SNR operating point are presented.

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  Cite this article

[IEEE Style]

T. Kim and W. Sung, "Performance Analysis and Optimization of the 16-QAM Modulation Scheme Using a Nonlinear Power Amplifier," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 9, pp. 847-855, 2002. DOI: .

[ACM Style]

Taehwan Kim and Wonjin Sung. 2002. Performance Analysis and Optimization of the 16-QAM Modulation Scheme Using a Nonlinear Power Amplifier. The Journal of Korean Institute of Communications and Information Sciences, 27, 9, (2002), 847-855. DOI: .

[KICS Style]

Taehwan Kim and Wonjin Sung, "Performance Analysis and Optimization of the 16-QAM Modulation Scheme Using a Nonlinear Power Amplifier," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 9, pp. 847-855, 9. 2002.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880