Method of designing OFDM-TDCS waveform with low PAPR

An OFDM-tDCS and waveform design technology, applied in the field of OFDM-tdCS waveform design with low peak-to-average power ratio, can solve problems such as pilot distortion, high PAPR, affecting channel estimation performance, etc., to reduce time-domain PAPR, reduce PAPR value, the effect of reducing the number of iterations

Inactive Publication Date: 2015-11-18
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

First of all, in the OFDM system, the basic idea of ​​the pilot-based channel estimation method is that the transmitter inserts the pilot at an appropriate position, and the receiver recovers the pilot position and pilot sequence through the same pilot generation method; while in OFDM- In the TDCS system, due to the inconsistency of the electromagnetic environment between the transmitter and the receiver, the available spectrum of the transmitter and the receiver is inconsistent. At this time, the pilot position and pilot sequence generated by the transmitter are unknown to the receiver. , if the channel estimation is performed directly, the channel estimation may be completely wrong due to pilot misalignment. The existing OFDM-TDCS channel estimation methods reduce the influence of pilot misalignment by setting eq

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  • Method of designing OFDM-TDCS waveform with low PAPR
  • Method of designing OFDM-TDCS waveform with low PAPR
  • Method of designing OFDM-TDCS waveform with low PAPR

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[0040] The technical solution of the present invention will be described in detail below in conjunction with the embodiments and the drawings.

[0041] In this embodiment, the Matlab simulation platform is used for running experiments.

[0042] The system parameters in the embodiment are as follows: the channel sampling frequency is 10MHz, the total number of subcarriers is N=1024, the number of FFT points is 4096, and the pilot interval is N f =10, the modulation order of CCSK is 1024, the coding method is a convolutional code with a rate of 1 / 2, the unusable sub-carrier sequence number is [153,154,...,251; 655,656,...,753], the sideband protection sub-carrier sequence number Is [1; 473,474,...553], the remaining sub-carriers are all available sub-carriers, according to figure 2 In the pilot pattern search method shown, the pilot search is performed in the set of available subcarriers to obtain the pilot subcarrier sequence number [2,12,...,152; 252,262,...472; 554,564,...,654; 75...

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Abstract

The invention belongs to the communication technology field, and especially relates to a method of designing an OFDM-TDCS waveform with low PAPR (Peak-to-Average Power Ratio) in the field of cognitive radio technology. According to the method, the reasonable design of a pilot frequency pattern prevents all pilot frequencies from being not available due to pilot frequency shifts; through optimization of a pilot frequency sequence, a PAPR value of a signal is reduced, and distortion of the pilot frequency sequence caused by PAPR control is minimized; and the PAPR and outband attenuation of the signal can both meet the requirements of a cognitive radio system by combining noise shaping amplitude limit with outband radiation control.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a low peak-to-average power ratio (Peak-to-AveragePowerRatio, PAPR) OFDM-TDCS waveform design method in cognitive radio technology. Background technique [0002] Cognitive Radio (CR) technology was first proposed by Dr. JosephMitolaIII in 1999. Its core idea is to obtain the spectrum available at the current time through spectrum sensing, and use these spectrums for data transmission, thus greatly improving overall Spectrum utilization. [0003] The transform domain communication system (TransformDomain Communication System, TDCS) uses the idea of ​​cognitive radio to dynamically change the spectrum waveform of the transmitted signal within a given spectrum range to avoid interference with authorized users. Document 1 "Addressing the control channel design problem: OFDM-based transform domain communication system informive radio (by Chuan Han, Jun Wang, Yaling ...

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/262
Inventor 甘华强王军李少谦
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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