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Clipping Distortion Performance of Nonsquare M -QAM OFDM Systems on Nonlinear Time-Variant Channels

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2 Author(s)
Mendes, L.L. ; Inst. Nac. de Telecomun., Santa Rita do Sapucai, Brazil ; Filho, R.B.

Orthogonal frequency-division multiplexing (OFDM) systems usually make use of a set of square M quadrature-amplitude modulation ( M-QAM) constellations to obtain a good tradeoff between throughput and symbol-error robustness. However, the switch to the next constellation increases the number of bits per modulation symbol by two. The introduction of nonsquare M -QAM constellations in such systems brings extra advantages such as smoother transition among bit rates and a reduction of the peak-to-average ratio of the OFDM signal. Therefore, this paper unfolds analytical expressions to evaluate the symbol-error performance of nonsquare M-QAM OFDM on nonlinear time-variant additive white Gaussian noise channels, taking clipping distortion into account. Cross and overlaid M-QAM are considered. Analytical performances are evaluated and compared with computational simulations, which show good agreement.

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Vehicular Technology, IEEE Transactions on  (Volume:60 ,  Issue: 8 )