Method and system for reducing multi-carrier peak average ratio

A peak-to-peak technology, applied in the field of reducing multi-carrier peak-to-average ratio, can solve the problem of high signal peak-to-average ratio, and achieve the effect of improving power amplifier efficiency and reducing difficulty

Inactive Publication Date: 2011-05-18
ZTE CORP
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method and system for reducing the peak-to-average ratio of multi-carriers, so as to overcome the shortcomings of the prior art that the signal peak-to-average ratio is high after passing through the intermediate frequency

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  • Method and system for reducing multi-carrier peak average ratio

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Embodiment Construction

[0037] The technical solution of the present invention will be described in more detail below with reference to the drawings and embodiments.

[0038] The basic concept of the method of the present invention is: before the signal is input into the power amplifier, the signal is digitally up-converted, and the intermediate frequency time delay is carried out during the processing; after the processing is completed, the amplitude exceeds the preset peak threshold The signal is peak-shaving, and the delay of each DUC signal is adjusted according to the number of times the signal whose amplitude exceeds the above-mentioned peak threshold value occurs within the preset time interval.

[0039] Among them, performing digital up-conversion processing on the signal, and performing intermediate frequency delay in the processing process refers to: oversampling the signal, generating multiple oversampled signals, performing frequency shift and delay on each signal, and performing combinati...

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Abstract

The invention relates to a method and a system for reducing a multi-carrier peak average ratio. The system comprises a digital up-conversion (DUC) module and a crest factor reduction (CFR) module. The method comprises the following steps of: before signals are inputted to a power amplifier, performing DUC processing on the signals, and performing intermediate-frequency time delay in the processing process; and after the processing is finished, performing peak clipping on signals of which the amplitude exceeds a threshold value of a preset peak value, and adjusting the delay of each path of signal in the digital up-conversion process according to the occurrence times of the signals of which the amplitude exceeds the threshold value of the peak value within a preset time interval. Due to the adoption of the method and the system, PAR (peak to average power ratio) output by DUC can be reduced effectively, the difficulty of subsequent peak clipping is lowered, the input signals with smalldynamic range are provided for the power amplifier, and the efficiency of the power amplifier is improved.

Description

technical field [0001] The present invention relates to a TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) system, in particular to a method and system for reducing the peak-to-average ratio of multiple carriers. Background technique [0002] As the mobile communication system has developed into a multi-carrier system and adopts a non-constant envelope modulation method at the same time, the signal input to the power amplifier will have a large peak-to-average ratio, and the linear range of the power amplifier is limited. In order to achieve linear amplification, power return can be used retreat, but this limits the power amplifier efficiency. [0003] When the input signal of the power amplifier has a large peak-to-average ratio, in order to overcome the nonlinear influence of the power amplifier, technologies such as power backoff or linearization of the power amplifier are generally used. If the input signal of the power amplifier has a small peak-to-av...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/04H04L27/26
CPCY02B60/50
Inventor 曾峰潘卫明段义军
Owner ZTE CORP
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