Study on Predistortion Techniques and Adaptive Modulation Used in Fading Channels

Wei Liu; E Zhang

doi:10.4028/www.scientific.net/AMR.756-759.3723

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 756-759Study on Predistortion Techniques and Adaptive...

Study on Predistortion Techniques and Adaptive Modulation Used in Fading Channels

Abstract:

Spectral efficiency is one of primary concern in the design of any wireless data communications systems, where fading is the main problem. An approach that can be taken to overcome the problem of fading is to adapt the modulation scheme according to the instantaneous propagation channel conditions. In this paper, we present a simplified mathematical model to calculate the probability of SER for any given constellation of M-QAM. This model plays an important role in designing spectrally efficient adaptive modulation over nonlinear mobile channels. Instantaneous spectral efficiency and its histogram distribution are found for linear and nonlinear channel cases. The achievable spectral efficiency is obtained for linear and nonlinear channel and compared with non-adaptive system and Shannon capacity.

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Periodical:

Advanced Materials Research (Volumes 756-759)

Pages:

3723-3727

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.756-759.3723

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Online since:

September 2013

Authors:

Wei Liu, E Zhang

Keywords:

Adaptive Modulation, Fading Channels, Predistortion Techniques

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