Waveform design and optimization for OFDM radar signal based on fractional Fourier transform

Author

Tian Liu ; Ning Cao ; Minghe Mao ; Fei Wang ; Yuefeng Du

Author_Institution

Sch. of Comput. & Inf., Hohai Univ., Nanjing, China

fYear

2014

fDate

15-17 Nov. 2014

Firstpage

724

Lastpage

729

Abstract

To gain better performance of the radar based on orthogonal frequency division multiplexing (OFDM), a new radar system based on OFDM using fractional Fourier transform (FRFT) rather than fast Fourier transform (FFT) is proposed in this paper. The expression of OFDM radar signals is given and its wideband ambiguity function (WAF) is derived in detail. Also, the peak to average power ratio (PAPR) of the proposed radar signal is analyzed. The WAF performance of FFT-based and FRFT-based OFDM radar signal with Barker code modulation are both simulated contrastively. It is shown that FRFT-based OFDM radar signal has better WAF with better thumbtack shape. Besides, FRFT-based OFDM radar signal gains higher velocity resolution as well as distance resolution and gets lower PAPR.

Keywords

Fourier transforms; OFDM modulation; modulation coding; optimisation; radar signal processing; Barker code modulation; FRFT; OFDM radar signal; WAF performance; fractional Fourier transform; optimization; orthogonal frequency division multiplexing; peak to average power ratio; wideband ambiguity function; Doppler radar; Fourier transforms; Peak to average power ratio; Shape; Signal resolution; FRFT; OFDM; PAPR; WAF;

fLanguage

English

Publisher

ieee

Conference_Titel

Systems and Informatics (ICSAI), 2014 2nd International Conference on

Conference_Location

Shanghai

Print_ISBN

978-1-4799-5457-5

Type

conf

DOI

10.1109/ICSAI.2014.7009380

Filename

7009380