A multi-stage rate peak clipping method and device

Abstract

The invention discloses a multi-rate peak clipping method and device. The multi-rate peak clipping method includes that a multi-rate peak clipping device uses a preset first speed rate peak clipping threshold and a preset first peak clipping coefficient to carry out primary digital peak clipping on a multi-carrier superposed signal after performing multi-carrier superposition; the multi-rate peak clipping device uses a preset second speed rate peak clipping threshold and a preset second peak clipping coefficient to carry out secondary digital peak clipping on an interpolated signal after performing signal interpolation. According to the embodiment, the multi-rate peak clipping mode is used for clipping signal peaks, the signal peak recurrence after interpolation can be avoided, the peak clipping effect is good, the peak clipping hardware resource can be saved, the peak clipping performance is improved, and the problems of large peak lifting, peak regeneration, signal quality degradation and the like after the multi-carrier superposition can be solved. The multi-rate peak clipping mode clips large-peak signals through low-speed peak clipping, and the peaks of the reserved small-peak signals are clipped in a high speed in subsequent.

Description

Technical field [0001] The present invention relates to the field of communication technology, in particular to a method and device for multi-rate peak clipping. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) multi-carrier system uses orthogonal frequency division channels, can support high-speed wireless data transmission without the need for complex equalization technology, and has strong anti-fading and The ability to resist ISI (Inter Symbol Interference, inter-symbol interference), but the main disadvantage of the OFDM system is that it has a large PAPR (Peak to Average Power Ratio, peak to average power ratio, referred to as peak to average ratio), which directly affects the peak to average power ratio The operating cost and efficiency of the entire system, and the peak-to-average ratio is a common problem in multi-carrier modulation. [0003] In order to overcome the problem of excessive peak-to-av...

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Problems solved by technology

[0002] OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) multi-carrier system uses orthogonal frequency division channels, which can support high-speed wireless data transmission without complex equalization technology, and has strong anti-fading and The ability to resist ISI (Inter Symbol Interference, inter-symbol interference), but the main disadvantage of the OFDM system is that it has a large PAPR (Peak to Average Power Ratio, peak-to-average power ratio, referred to as peak-to-average ratio), and the peak-to-average ratio directly affects The operating cost and efficiency of the entire system, the peak-to-average ratio problem is a common problem in multi-carrier modulation

[0003] In order to overcome the problem of excessive peak-to-average ratio, many peak-cutting algorithms have been proposed in the prior art, and the use of loop-limiting filtering algorithm and subcarrier reservation algorithm is more common.

Among them, the loop clipping filtering algorithm belongs to the clipping technology, and its implementation is relatively simple, that is, it directly clips the excessively high peak value, which is a nonlinear processing, which will generate in-band noise and out-of-band interference, and needs to be eliminated by filtering. outside clipping noise, but the filtered signal will cause peak regeneration, and the peak value of the signal before clipping is much smaller

The subcarrier reservation algorithm does not need to transmit sideband information, does not introduce in-band and out-of-band interference, and its complexity is relatively low without sacrificing spectral efficiency, but it will generate interference on all available carriers

[0004] In the prior art, the first-level rate peak-shaving method is generally adopted, but it is difficult to completely remove the signal peak value in the first-level rate peak-shaving mode, and the signal peak value after interpolation will reappear.

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