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Automatic control apparatus and method of digital signal peak power

An automatic control device and digital signal technology, applied in the direction of multi-frequency code system, etc., can solve problems affecting communication performance, signal spectrum deterioration, etc., and achieve the effect of ensuring communication performance

Active Publication Date: 2014-05-21
COMBA TELECOM SYST CHINA LTD
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Problems solved by technology

Hard clipping works better when the signal peak power is relatively stable. When the signal peak power changes greatly, the hard clipping peak attenuates more signal peaks, causing serious deterioration of the signal spectrum and affecting communication performance.

Method used

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  • Automatic control apparatus and method of digital signal peak power
  • Automatic control apparatus and method of digital signal peak power
  • Automatic control apparatus and method of digital signal peak power

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Embodiment Construction

[0026] The present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0027] like Figure 4 As shown, it is a schematic structural diagram of an automatic control device for digital signal peak power in an embodiment of the present invention, including a gain processing module 402, an input amplitude calculation module 403, an output amplitude calculation module 404, an attenuation calculation module 405, a comparison module 406, a gain Determination module 407;

[0028] In a preferred embodiment, it also includes a delay module 401, configured to delay the input digital signal, and output the delayed input digital signal to the gain processing module 402;

[0029] On the main signal chain, the input signal I in / Q in Carry out the time delay of T cycles through time delay module 401, calculate the required time to compensate subsequent gai...

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Abstract

The invention provides an automatic control apparatus of a digital signal peak power. The apparatus is composed of a gain processing module, an input amplitude calculation module, an output amplitude calculation module, an attenuation calculation module, a comparison module and a gain determination module. The attenuation calculation module carries out calculation to obtain an attenuation coefficient; the input amplitude calculation module and the output amplitude calculation module carry out calculation and a comparison result is obtained by the comparison module; and a gain value is determined by the gain determination module to realize gain control of the input signal. Correspondingly, the invention also provides an automatic control method of a digital signal peak power. According to the invention, the output signal can be ensured not to exceed a threshold value; and the signal spectral shape is maintained to be unchanged basically, so that the communication performance is not influenced.

Description

technical field [0001] The invention relates to the field of digital signal processing, in particular to a digital signal peak power automatic control device and a digital signal peak power automatic control method. Background technique [0002] The transmitting end of the traditional digital communication system generally adopts multi-carrier signals in order to meet the increasing demands of communication services. However, after the digital baseband signal undergoes shaping filtering, DDC, and multi-carrier synthesis, there are problems of peak-to-average ratio expansion and uncontrollable peak power. Especially for digital repeater systems, due to the uncertainty of input power, the signal Peak power is completely uncontrollable. In order to limit the peak power of the signal, the current common practice is to add the method of hard peak clipping, that is, the signal peak value greater than the threshold is directly discarded, thereby limiting the maximum peak power of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 黄小锋介利军徐辉张占胜
Owner COMBA TELECOM SYST CHINA LTD
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