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Iterative clipping and filtering method for reducing peak-to-average ratio of OFDM signals

A signal peak-to-average ratio and iterative clipping technology, which is applied to the modulation carrier system, digital transmission system, electrical components, etc., can solve the problem of complex implementation of the iterative calculation process

Active Publication Date: 2016-05-04
BEIJING RES INST OF TELEMETRY +1
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Problems solved by technology

It can be seen from this that two coordinate transformations are required in the clipping process of one iterative process, so the implementation of the iterative calculation process of this type of ICF method is relatively complicated

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  • Iterative clipping and filtering method for reducing peak-to-average ratio of OFDM signals
  • Iterative clipping and filtering method for reducing peak-to-average ratio of OFDM signals
  • Iterative clipping and filtering method for reducing peak-to-average ratio of OFDM signals

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[0065] The basic idea of ​​the present invention is: a method for iterative clipping filtering to reduce the peak-to-average ratio of OFDM signals, first calculate the OFDM time-domain signal power, and exceed the power threshold P according to the clipping factor α 0 The real and imaginary parts of the OFDM are subjected to clipping processing respectively; secondly, the OFDM time-domain signal after clipping processing is transformed into an OFDM frequency-domain signal by FFT for frequency-domain filtering; and then the frequency-domain filtered signal is transformed into OFDM by IFFT The time-domain signal completes 1 iterative limiting filtering process; finally repeats the above-mentioned iterative limiting filtering process according to the maximum number of iterations, the method in the present invention does not require the OFDM system to transmit additional information, and does not need to perform the OFDM signal at the receiving end. Additional processing compensate...

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Abstract

The invention provides an iterative clipping and filtering method for reducing the peak-to-average ratio of an OFDM signals. The method comprises the steps of: firstly, calculating OFDM time domain signal power, and carrying out clipping on the real parts and imaginary parts of the OFDMs exceeding a power threshold P0 according to a clipping factor [alpha]; secondly, converting the OFDM time domain signals after the clipping into OFDM frequency domain signals by means of FFT conversion, and carrying out frequency domain filtering; then converting the signals after the frequency domain filtering into OFDM time domain signals by means of IFFT conversion, and finishing one time of iterative clipping and filtering processing; and finally, according to a maximum iterative number, repeating the above iterative clipping and filtering process. In the method, an OFDM system does not need to transmit additional information, additional processing on the OFDM signals on a receiving end for compensating the influences of the clipping processing on a sending end is not needed, the clipping factor [alpha] is suitably selected, the clipping processing is completed only by means of additive operation, and frequency domain filtering can be directly carried out on the processing result by means of the FFT conversion; in addition, in the iterative clipping and filtering process, a work clock multiplexing FFT / IFFT conversion unit higher than a sampling rate is adopted, and realization resources inhibited by the peak-to-average ratio are saved.

Description

technical field [0001] The invention belongs to the technical field of digital wireless communication transmission, and relates to a method for reducing the peak-to-average ratio of OFDM signals through iterative limiting filtering. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology is a multi-carrier modulation technology. With its advantages such as high transmission rate and strong anti-multipath ability, it is widely used in the field of wireless communication. It is the fourth generation One of the core technologies of ground mobile communication. [0003] The basic principle of OFDM technology is to modulate the high-speed serial input data stream to N s On low-speed parallel sub-carriers that are orthogonal to each other, the information rate of each sub-carrier data stream is reduced to 1 / N of the input data stream s times, the data symbol period is extended to N of the input data s times. The modulation / demodulation proces...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2614
Inventor 马云思周三文闫朝星
Owner BEIJING RES INST OF TELEMETRY
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