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

A signal peak-to-average ratio and digital signal technology, applied in digital transmission systems, electrical components, transmission systems, etc., can solve the problem of reducing carrier signal peak-to-average ratio, error vector magnitude adjacent channel power leakage rate exceeding the standard, and poor peak clipping effect, etc. problem, to avoid signal distortion, optimize the effect of peak clipping, and save money
CN101645862AInactive Publication Date: 2010-02-10ZTE CORP
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
ZTE CORP
Publication Date
2010-02-10
Estimated Expiration
Not applicable Β· inactive patent

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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 to intermediate 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.
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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...

Claims

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