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A novel criterion for designing of nonlinear companding functions for peak-to-average power ratio reduction in multicarrier transmission systems

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Abstract

Nonlinear companding transform is a promising technique for the peak-to-average power ratio (PAPR) reduction in multicarrier transmission systems. However, conventional hard piecewise companding schemes often along with serious nonlinear distortion or complex companding parameters optimization embarrassment. In this paper, a novel designing criterion of nonlinear companding functions with more effective system performance is proposed. By transforming the Gaussian-distributed multicarrier signals into desirable statistics forms, we show that the smooth and differentiable concave probability distribution function of companded signals can obtain a better PAPR reduction and less out-of-band radiation as well as more simple companding parameters optimization than the traditional piecewise companding schemes. A detailed theoretical analysis and discussion is formulated, and then based on the analysis results, a novel trigonometric function companding scheme is presented and evaluated. Numerical results demonstrate that the companding schemes which consistent with the proposed criterion may significantly outperform conventional schemes by choosing the companding form and parameters appropriately.

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Notes

  1. We remark that a bad function with more degrees of freedom can lose to a good function with fewer degrees of freedom.

  2. More details can be found in [2528]. For example, a 5 order equation will need to be addressed when using (20) directly in [25].

  3. It has been pointed in [2426] that the distribution of large signals is increased greatly by such a transform, and which makes its PAPR reduction very limited under certain BER.

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Peng, S., Yuan, Z. A novel criterion for designing of nonlinear companding functions for peak-to-average power ratio reduction in multicarrier transmission systems. Wireless Netw 24, 581–595 (2018). https://doi.org/10.1007/s11276-016-1356-2

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