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Method for decreasing wave peak factor of multiple carrier signal

A multi-carrier signal and crest factor technology, applied in the modulation carrier system, multi-frequency code system, digital transmission system, etc., can solve the problems of limiting the practical application of the Henkel method and the time consumption of calculation operations

Inactive Publication Date: 2006-11-01
INTEL CORP
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Problems solved by technology

According to Henkel and Tellado, the disadvantage of this implementation is that the high-pass filter 13 and all filters of the interpolation means 15 must take into account each iteration or repetition
This results in time consumption of computational operations and limits the practical application of state-of-the-art Henkel methods

Method used

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  • Method for decreasing wave peak factor of multiple carrier signal
  • Method for decreasing wave peak factor of multiple carrier signal
  • Method for decreasing wave peak factor of multiple carrier signal

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Embodiment Construction

[0033] exist figure 1In the block diagram shown, a data stream 10 is provided to an IFT device 11 in which an inverse Fourier transform, eg, a fast inverse Fourier transform of a signal 10, is performed. The transformed output signal 12, a multicarrier signal such as a DMT or OFDM signal, has a crest factor, ie the ratio of the signal maximum value to the signal normal value, which is reduced in the PAR reduction means 20. The PAR reduction device 20 is followed by a filter device 13 which delivers a filtered output signal 14 . This filtered output signal 14 is then interpolated in a first interpolation means 15, such as an interpolation stage with a downstream low-pass filter, that is to say a predetermined number of zero values ​​are inserted between adjacent sample values, whereby In the meantime, the image sidebands generated in the filtered signal 14 are suppressed in the integrating low-pass filter. Thus, an interpolated and filtered signal 150 is produced at the outp...

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Abstract

The present invention provides a method for reducing the crest factor of a multi-carrier signal, comprising the following steps: (a) using an IFT device (11) to inverse Fourier transform the signal (10); (b) using a second filtering Interpolation means (15) of the device interpolate and filter the output signal (14) from the first filtering means (13); (c) determine an estimate of the signal maximum value of the interpolated and filtered output signal (150, 16) (d) deriving a correction variable (32) from the estimated value of the determined signal maximum value; (e) multiplying the derived correction variable with the normalized signal (33) output from the Dirac function storage device (31) (f) modify the output signal (12) of the IFT device (11) by subtracting the multiplied correction variable (32); and (g) repeat iteration steps (c) to (f) until a predetermined iteration value and / or a predetermined crest factor is reached.

Description

technical field [0001] The present invention relates to a method for reducing the crest factor of a multi-carrier signal, in particular to a method for reducing the crest factor of a DMT or OFDM signal. Background technique [0002] Multicarrier signals typically have a high ratio between the signal maximum value and the signal standard deviation. This ratio, also known as the crest factor, places stringent requirements on amplifiers and transmitters to prevent saturation effects that can lead to data loss. Therefore, there is a practical need to reduce the crest factor of discrete multi-frequency modulation (DMT) and orthogonal frequency division multiplexing (OFDM) signals in order to prevent saturation of amplifiers and transmitters and further reduce power consumption of amplifiers and transmitters during transmission. If the crest factor is square rooted, it is the so-called peak-to-average ratio (PAR: peak-to-average ratio), which should likewise be reduced for the re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2614
Inventor 阿克塞尔·克劳森
Owner INTEL CORP
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