Method and device for reducing signal peak-to-average ratio

Abstract

The invention discloses a method for reducing the signal peak-to-average ratio, which comprises the following steps: calculating synthesis peak clipping pulse shaping filter coefficients according tointermediate frequency digital signals; acquiring cancellation pulses; and after delaying the intermediate frequency digital signals, performing operation with the cancellation pulses and outputting signals with low peak-to-average ratio. The invention also discloses a device for reducing the signal peak-to-average ratio, which comprises a synthesis peaking pulse shaping filter, a tapping value calculating element, a first frequency spectrum moving unit, a digital filtering unit, a second frequency spectrum moving unit, a half-band filter, a delay unit and a cancellation unit. The method and the device can be adaptable to multi-carrier signals of each carrier frequency point flexibly configured in the available frequency band range, optimize the peak clipping effect, avoid signal distortion and save expenses.

Description

technical field [0001] The invention relates to a signal processing technology of a wireless communication system, in particular to a method and a device for reducing the signal peak-to-average ratio. Background technique [0002] In order to increase the data transmission rate, the 3G wireless communication system generally uses high-order modulation methods such as quadrature phase shift keying (QPSK) and quadrature amplitude modulation (QAM) for signal modulation. However, due to the non-constant envelope characteristics of high-order modulation methods such as QPSK and QAM, signals modulated by high-order modulation methods such as QPSK and QAM generally have a high peak-to-average ratio (PAR). Also, when transmitting a composite signal of multiple carriers, the peak-to-average ratio will be higher. After the signal with peak-to-average ratio is converted by digital-to-analog (DA) and sent to the power amplifier, it is easy to cause the power amplifier to work in the no...

AI Technical Summary

Problems solved by technology

[0010] In the prior art, the CFR module performs peak clipping on the intermediate frequency digital signal, regardless of single carrier signal or multi-carrier signal, a peak clipping filter is used, because the use of a filter will reduce the peak-to-average ratio of the carrier signal at the same time, White noise is inevitably generated, and problems such as error vector magnitude (EVM) and adjacent channel power leakage rate (ACLR) exceed the standard. The multi-carrier signal with continuous spectrum arrangement is more effective, but for the case where the spectrum of each carrier in the multi-carrier signal is far apart, the peak clipping effect is poor

[0011] In some wireless communication systems, the frequency configuration of each carrier in a multi-carrier signal is very flexible. The spectrum of each carrier may be adjacent to each other, or may be far apart within the available frequency range of the system, such as an integral multiple of 200KHz. There is a method of reducing the peak-to-average ratio of the signal, which does not meet the system requirements well

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