Method for suppressing peak-to-average power ratio in grid multi-carrier parallel transmission system

Abstract

The invention discloses a method for suppressing a peak-to-average power ratio in a grid multi-carrier parallel transmission system. By utilizing a principle of statistics, a companding signal is processed into an intercepted sharp distribution function with the distribution form same as the original signal, so that the statistical distribution properties of the original signal are maintained to the greatest degree, and the time-frequency characteristics of the transmitted aerial signal can be well guaranteed; and therefore, the error code performance loss caused by non-linear distortion can be effectively reduced. A simple and practical pre-distortion companding processing algorithm is adopted, and compression of a large signal in the transmitted signals and expansion of a small signal in the transmitted signals can be realized by changing the statistical distribution properties of the companding signal, so that high progressive consistency is realized between the distribution of the signal processed by a companding device and the distribution characteristics of the original signal. The test result proves that good time-frequency characteristics of the grid multi-carrier shaping impulse can be ensured when the peak-to-average ratio is effectively reduced, and the peak-to-average power ratio of the transmitted signal is obviously improved under the condition that the signal power is invariable before and after companding.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, relates to a multi-carrier parallel transmission system, in particular to a method for suppressing peak-to-average power ratio in a grid multi-carrier parallel transmission system. Background technique [0002] With the rapid development of communication grid and broadband, people's requirements for data transmission capability and real-time performance are also increasing. The grid multi-carrier system is different from the traditional Orthogonal Frequency Division Multiplexing (OFDM) system based on rectangular shaped pulses. Its special time-frequency structure and shaped pulse design enable it to better adapt to the time-varying characteristics of the channel. Stronger anti-channel interference capability than traditional OFDM. However, like the general multi-carrier signal, the grid multi-carrier signal also faces the problem of higher peak-to-average power ratio, and due to ...

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Problems solved by technology

[0011] The problem to be solved by the present invention is: the traditional companding design method, at the cost of changing the statistical distribution characteristics of the signal after companding, in exchange for the effective reduction of the peak-to-average ratio of the signal, because these methods are all set to obey the linear distribution of the signal after companding This is undoubtedly far from the fact that the original signal amplitude obeys the Rayleigh distribution. Therefore, these technologies cannot avoid the problem of a large loss in system bit error performance while effectively reducing the peak-to-average ratio.

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