Method for reducing PAR of carrier signal

Abstract

The invention discloses a method of reducing the peak-to-mean ratio of multicarrier signals. The method comprises steps of generating hard despicking signals according to multicarrier combining signals and a despicking threshold; generating multicarrier noise peak signals according to time-delayed multicarrier combining signals and the hard despicking signals; estimating the baseband signal power of each carrier on the basis of multicarrier baseband signals, generating carrier power estimated value, compensating the delay caused by power estimation, and obtaining a carrier power estimation value for delay compensation; performing matched filtering to the multicarrier noise peak signals according to the carrier power estimation value for delay compensation to obtained filtered multicarrier noise peak signals; summing the filtered multicarrier noise peak signals and the multicarrier combining signals to obtain multicarrier despicking signals. By adopting the invention, the phenomenon that carriers with different powers can cause signal distortion and imbalance when using a same matched filter gain can be avoided.

Description

technical field [0001] The invention relates to a digital signal transmission technology in a wireless communication system, in particular to a method for reducing the peak-to-average ratio of multi-carrier signals. Background technique [0002] In the wireless communication system, the peak-to-average ratio of the signal entering the power amplifier is reduced by peak clipping technology to improve the efficiency of the power amplifier, but at this time it will also bring a certain degree of in-band signal distortion, out-of-band spectrum broadening and other problems, and This degrades the quality of the transmitted signal, thereby affecting the demodulation performance of the receiver. In code division multiple access systems (such as WCDMA, cdma2000 and TD-SCDMA), the error vector magnitude is usually used to measure the degree of in-band distortion of the signal, and the adjacent channel power leakage ratio is used to characterize the degree of out-of-band spectrum expa...

AI Technical Summary

Problems solved by technology

When the sampling frequency of the input combined digital IF signal is large, such as 12 times or more, the number of taps of the filter is very high, and complex filtering processing is also required, which greatly increases the hardware implementation (FPGA or ASIC ) costs and difficulties

Although this technical solution considers the appropriate adjustment of the gain of each carrier matched filter coefficient when it is generated, in order to obtain better performance than only using the scaler for uniform gain adjustment, it does not specify how to adjust each carrier matched filter coefficient. Coefficients for gain adjustment, and how to adjust the coefficients of each carrier matched filter in real time, especially how to adjust the gain of each matched filter in system implementation

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