Peak clipping method for multi-carrier frequency hopping communication system

A frequency-hopping communication and multi-carrier technology, applied in multi-frequency code systems, transmission systems, baseband system components, etc., can solve problems such as in-band distortion and increased bit error rate

Inactive Publication Date: 2010-02-17
COMBA TELECOM SYST CHINA LTD
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Problems solved by technology

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

Method used

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  • Peak clipping method for multi-carrier frequency hopping communication system
  • Peak clipping method for multi-carrier frequency hopping communication system
  • Peak clipping method for multi-carrier frequency hopping communication system

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Embodiment Construction

[0063] Describe as follows in conjunction with accompanying drawing and embodiment:

[0064] The multi-carrier frequency hopping communication system peak clipping 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 kind of chip is widely used in mobile communication systems, so it is widely representative, and it is used to assist in elaboration in this embodiment. However, other digital chips with programmable capabilities known to those skilled in the art, and New digital chips with equivalent capabilities developed in the future should not be excluded from the protection scope of the present invention.

[0065] 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 sys...

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Abstract

The invention discloses a peak clipping method for a multi-carrier frequency hopping communication system, which is characterized by comprising the following real-time steps: (1) judging whether the signal bandwidth in the present moment is changed or not relative to the previous moment, if so, executing the step (3), otherwise, executing the step (2); (2) calculating a frequency difference of thepresent system signal and a center frequency point in the previous adjacent moment, carrying out frequency shift on a filter by the frequency difference so that the center frequency point is consistent with the present system signal and skipping to execute the step (4); (3) reconstructing the filter demanded by the digital bandwidth, the center frequency point and a spectrum template meeting thepresent system signal and executing the step (4); (4) constructing a peak clipping pulse, aligning to a peak value of the system signal by a peak value in response to a filter pulse and subtracting the peak clipping pulse by the system signal. The peak clipping method for the multi-carrier frequency hopping communication system can self-adaptively adjust the filter coefficient for constructing thepeak clipping pulse according to the carrier frequency point change of the system, thereby ensuring that the peak clipping effect is better than a traditional process.

Description

technical field [0001] The invention relates to a peak clipping method of a multi-carrier frequency hopping communication system 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 dire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03H04B1/713
Inventor 施英赖文强
Owner COMBA TELECOM SYST CHINA LTD
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