Abstract
Nonlinear companding transform is an effi- cient method to reduce the high peak-to-average power ratio (PAPR) of multicarrier transmission systems. However, the introduced companding noise greatly degrades the bit-error- rate (BER) performance of the companded multicarrier sys- tems. In this paper, a simplified but effective scheme of es- timation and cancellation of companding noise for the com- panded multicarrier transmission system is proposed. By ex- pressing the companded signals as the summation of original signals added with a companding noise component, and sub- tracting this estimated companding noise from the received signals, the BER performance of the overall system can be significantly improved. Simulation results well confirm the great advantages of the proposed scheme over other conven- tional decompanding or no decompanding schemes under various situations.
Highlights
Multicarrier transmission is a promising technique in future communication systems
It’s known that the efficiency of the high power amplifier (HPA) is directly related to the peak-to-average power ratio (PAPR) of the input multicarrier signals especially in the orthogonal frequency division multiplexing (OFDM) systems, which is applied in many important wireless communication standards such as the Third Generation Partnership Project (3GPP) Long-Term Evolution Advanced (LTE-A) standard [1], [2]
D is the companding degree, is equipped with several conventional operations at the receiver, including conventional decompanding (DC) [13], [14], [15], [16], [20], no decompanding (NDC) [17], [18] as well as the proposed companding noise cancellation (CNC) operations are all considered in the simulations
Summary
Multicarrier transmission is a promising technique in future communication systems. one of the major drawbacks of multicarrier systems is the inherent high peak-to-average power ratio (PAPR) of the transmitted signals. The companding transform can achieve more effective PAPR reduction and better BER performance than the clipping method. It attracts more and more researchers’ attention in recent years. The BER performance can be greatly improved in this scheme, due to the inherent complex expression of the companding function, the accurate attenuation coefficient of the input signals will difficultly to be determined, and greatly restrains the effectiveness for general companding transforms.
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