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Method and device for reserving the sub-carrier to reduce the peak average power ratio of the OFDM system based on IFFT/FFT

A technology of reserving sub-carriers and peak-to-average power ratio, applied in the field of communication, can solve the problem of not being able to find peak-shaving data, etc.

Inactive Publication Date: 2007-09-12
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the traditional pre-stored waveform TR algorithm can be considered as a static algorithm, and cannot find suitable peak-elimination data for dynamic information sequences.

Method used

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  • Method and device for reserving the sub-carrier to reduce the peak average power ratio of the OFDM system based on IFFT/FFT
  • Method and device for reserving the sub-carrier to reduce the peak average power ratio of the OFDM system based on IFFT/FFT
  • Method and device for reserving the sub-carrier to reduce the peak average power ratio of the OFDM system based on IFFT/FFT

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Embodiment Construction

[0074] The present invention will be described in further detail below with reference to the accompanying drawings.

[0075] With reference to Fig. 2, the present invention is used in the TR scheme based on IFFT / FFT transformation pair in OFDM system, carries out as follows:

[0076] In the first step, according to the parameter requirements of the OFDM system, set the number L of reserved subcarriers in the N subcarriers of the system, determine the position of the reserved subcarriers, determine the PAPR threshold value D of the signal and the maximum number of iterations M .

[0077] The more reserved subcarriers, the better the PAPR reduction effect of the present invention, but since useful information is not propagated at the reserved subcarriers, the more reserved subcarriers, the lower the frequency band utilization rate of the system. Therefore, when implementing the solution of the present invention, the number of reserved subcarriers and the effect of reducing the ...

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Abstract

The invention discloses that based on open IFFT / FFT lower reserved subcarrier OFDM system PAPR methods and devices, and the system is using IFFT / FFT transform to a peak frequency domain Consumers sequence in the transmitter to reduce OFDM system ratio of power PAPR, the method described in steps including data distribution , IFFT transformation, realizing OFDM modulation, gained time-domain signal, judgment threshold and whether the number of iterations is to achieve settings, limited Consumers peak processing, extracted through FFT frequency domain reduce-peak sequence. The installations include the transmitter and receiver, the transmitter unit increased data distribution, data option modules, judgment unit, a unit reduce-peak sequence, sequence reduce-peak insert modules; Receiver increased information extraction unit. This invention in a process of elimination-series will not lead to the increase in bit error rate, the effect of significantly reducing the PAPR, the device is simple, running FFT / IFFT the iteration times is less.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to the reduction of the peak-to-average power ratio PAPR (Peak-to-Average Power Ratio) in an OFDM (Orthogonal Frequency Division Multiplexing) communication system, specifically a method based on IFFT / A method and device for effectively reducing the peak-to-average power ratio (PAPR) of an OFDM system by reserved subcarrier TR (Tone Reservation) of FFT. Background technique [0002] Orthogonal frequency division multiplexing OFDM technology is considered to be one of the core technologies of the fourth generation of mobile communication 4G because of its efficient spectrum utilization and good anti-multipath fading performance. At present, OFDM technology has been used in asymmetric digital subscriber line ( ADSL), digital audio broadcasting (DAB) and digital television broadcasting (DVB), IEEE 802.11, IEEE 802.16, and power line broadband data communications have been widely u...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2618
Inventor 杨刚杨铮杰李玉山
Owner XIDIAN UNIV
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