Open AccessFeasibility of multi‐carrier modulation signals as new illuminators of opportunity for passive radar: orthogonal frequency division multiplexing versus filter‐bank multi‐carrier
Author(s) -
Cao Wei,
Zhu Jiahua,
Li Xiaotian,
Hu Weidong,
Lei Jing
Publication year - 2016
Publication title -
iet radar, sonar and navigation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.489
H-Index - 82
eISSN - 1751-8792
pISSN - 1751-8784
DOI - 10.1049/iet-rsn.2015.0414
Subject(s) - orthogonal frequency division multiplexing , electronic engineering , filter bank , ambiguity function , cyclic prefix , prototype filter , modulation (music) , computer science , passive radar , bandwidth (computing) , doppler effect , radar , telecommunications , continuous wave radar , engineering , acoustics , low pass filter , physics , channel (broadcasting) , radar imaging , waveform , astronomy
In this study, the feasibility of multi‐carrier modulation signals for passive radar is investigated. The illuminators of opportunity involve orthogonal frequency division multiplexing (OFDM) and filter‐bank multi‐carrier (FBMC). Average ambiguity functions (AAFs) of OFDM and FBMC are derived in the similar expressions, while the discrepancies differ at the prototype filters and symbol periods. Simulation results validate the derivation of AAF and demonstrate that (i) both OFDM and FBMC are nearly perfect illuminators of opportunity in passive coherent location systems owing to their thumbtack‐shaped ambiguity function; (ii) the time delay resolutions of OFDM, CP–OFDM (cyclic prefix‐OFDM) and FBMC are all extraordinary because of the broadband property, despite the existence of two sidelobes as a consequence of CP insertion for CP–OFDM; (iii) the Doppler shift resolution is affected by the CP length and prototype filter designs, thus FBMC's Doppler bandwidth is larger than OFDM and CP–OFDM's Doppler bandwidth, but FBMC guarantees no existence of sidelobes due to the use of specially designed prototype filter. Therefore, multi‐carrier modulation signals are attractive new candidates for passive radar surveillance.