Table-lookup self-adapting peak-clipping method

An adaptive, look-up table technology, applied in transmission systems, multi-frequency code systems, electrical components, etc., can solve problems such as system introduction and high complexity

Active Publication Date: 2010-03-03
COMBA TELECOM SYST CHINA LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0023] Furthermore, if only the real-time adjustment of the adaptive adjustment filter coefficients is considered, the filter coefficients need to be recalculated for adaptive adjustment every tim

Method used

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Embodiment Construction

[0075] Describe as follows in conjunction with accompanying drawing and embodiment:

[0076] Table look-up self-adaptive peak-shaving method of the present invention is suitable to be integrated in the digital chip of FPGA (Field Programmable Gate Array, Field Programmable Gate Array), DSP (Digital Signal Processor, digital signal processor) and so on in the form of program, this Chips are widely used in mobile communication systems, so they are widely representative. In this embodiment, they are used to assist in the explanation. However, other digital chips with programmable capabilities known to those skilled in the art will be used in the future. The development of new digital chips with equivalent capabilities should not be excluded from the protection scope of the present invention.

[0077] For a multi-carrier frequency hopping communication system, the center frequency of each carrier changes according to the frequency hopping sequence over time, and the system bandwid...

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Abstract

The invention discloses a table-lookup self-adapting peak-clipping method. In the peak-clipping process of a frequency-hopping communication system, the coefficient of a filter is adjusted in time ina self-adapting way, and a peak-clipping pulse is accurately constructed to carry out effective peak-clipping processing on an input signal. The method comprises two steps: in a preliminary step, dividing the total bandwidth difference of the system into a plurality of bandwidth area sections, constructing a corresponding filter for any one bandwidth area section, obtaining the coefficient of thefilter and storing a data table characterizing a one-to-one correspondence relationship between all the bandwidth area sections and the coefficient of the corresponding filter; in the peak-clipping step, working out the corresponding element of a corresponding index sequence according to the signal bandwidth of the current time when changing the bandwidth of the system, and then further determining the coefficient of the corresponding filter according to the element. The invention can search a prestored data table according to the carrier wave frequency point change of the system, obtain the coefficient of the filter with proper matching with a current signal and adjust the filter used for constructing the peak-clipping pulse in the self-adapting way, thereby lowering the complexity degreeof the system and ensuring that the peak-clipping effect is better.

Description

technical field [0001] The invention relates to a table look-up adaptive peak-shaving method applied in frequency-hopping communication systems such as GSM and EDGE. Background technique [0002] In the current mainstream mobile communication systems, GSM and EDGE are typical representatives of multi-carrier frequency hopping communication systems. [0003] Compared with the single-carrier system, the multi-carrier system has a higher peak-to-average power ratio (PAPR) due to the superposition of multiple carrier signals in the time domain. In order to transmit these high-to-average power ratio signals without distortion, some components (such as power amplifiers) have high linearity requirements. If the signal variation range exceeds the linear range of the device, obvious in-band distortion and out-of-band radiation will occur , resulting in an increase in the bit error rate. Therefore, the signal peak-to-average power ratio has a direct impact on the performance of the ...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04B1/713
Inventor 施英赖文强
Owner COMBA TELECOM SYST CHINA LTD
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