Sub-carrier remaining method for reducing peak-to-average power ratio and bit error rate in combined way

Abstract

The invention discloses a sub-carrier remaining method for reducing a peak-to-average power ratio and a bit error rate in a combined way. The sub-carrier remaining method is characterized in that a closed mathematical expression is used for providing an optimum wave-shearing threshold and reducing the peak-to-average power ratio by linear operation in a transmitter, thereby operating a wave-shearing noise sequence by a linear mapping function to generate a sending sequence with the low peak-to-average ratio, and furthermore, a simple expression of the optimum wave-shearing threshold required when generating the wave-shearing noise sequence is provided; and a nonlinear distortion counteracting method for reducing a peak value and assistings a subcarrier wave sequence is introduced in a receiver so as to reduce the bit error rate of a system. The sub-carrier remaining method overcomes the defect that the existing method requires complex nonlinear operation to generate the sending sequence with the low peak-to-average power ratio and needs complex software simulation to generate the optimum wave-shearing threshold and the nonlinear distortion, so that the bit error rate is high. By adopting the sub-carrier remaining method, the peak-to-average power ratio can be reduced only by linear operation, and the bit error rate of the system can be reduced obviously, so that the calculation complexity is reduced greatly, and the performance of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of orthogonal frequency division multiplexing in mobile communication, and particularly relates to a joint technology for reducing peak-to-average ratio and alleviating non-linear distortion so as to reduce system bit error rate. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology is widely used in the field of mobile communication at present. Among them, how to reduce the peak-to-average ratio of the transmitter and how to alleviate the nonlinear distortion caused by the high-power amplifier to improve the bit error rate performance of the receiver is one of the hot spots and focuses of OFDM technology. [0003] According to the "International Institute of Electronics and Electrical Engineers Wireless Communications Journal" (IEEE Transactions on Wireless Communications, vol.8, Issue.5, 2009, Page(s): 2417-2423), the peak cancellation time-domain sequence through const...

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Problems solved by technology

However, the optimal shear threshold required for generating the shear noise sequence still requires computationally intensive software simulation to obtain, and the limited number of reserved subcarriers and the limited orthogonal frequency division of the high-power amplifier input fallback In multiplexed systems, none of the previous subcarrier reservation methods have addressed the improvement of system bit error rate performance

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