Analysis of OFDM and FMCW Signals for Radar Applications
Explore the comparison between Orthogonal Frequency Division Multiplexing (OFDM) and Frequency Modulated Continuous Wave (FMCW) signals in radar applications. Understand the performance differences, information extraction accuracy, resolution processing algorithms, and the use of OFDM signals in LiDAR technology.
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Presentation Transcript
OFDM vs. FMCW Fatima Al-Shaikhli EECS 725 Analysis Presentation
Goals of this Analysis Understanding OFDM Signals Compare performance between FMCW vs. OFDM signals in Radar Information extracted Accuracy & Resolution Processing Algorithms Exploring OFDM Signals for LiDAR
OFDM Signals Orthogonal Frequency Division Multiplexing (OFDM) Compared to a single-carrier scheme with identical data rate, OFDM thus has a lower symbol rate Transmits several symbols at once Frequency Band is Divided into N Orthogonal Subcarriers o ?0to ?? 1
Chirp Sequence Radar
Waveform Design Requirements Design Requirements are: ?, ?, ???? and ???? OFDM ? = ? ? ? ???? FMCW ? ? ???? # ?? ????????? ??????? ??? ? ??? Chirp duration, ?? ? 2?? ??? # chirps per sequence ? ? 2 ? 2 ? ? ? ?? To avoid deorthogonalization ? Guard Interval: ?? 2???? OFDM Symbols: ? 2???? ? 2?????? ? ? = ? 2?? ???
Comparison OFDM FMCW Modulation and Demodulation needed More complex needed Less hardware complexity No deorthogonalization issues No constraints on chirp duration Less storage needed OFDM needs 2NM symbol storage for processing
References [1] J. Fink and F. K. Jondral, Comparison of OFDM radar and Chirp Sequence Radar, 2015 16th International Radar Symposium (IRS), 2015. doi:10.1109/irs.2015.7226369 [2] M. Braun, Ofdm radar algorithms in mobile communication networks, Phd thesis, Institut fur Nachrichtentechnik des Karlsruher Instituts fur Technologie, Karlsruhe, 2014. [3] G. K. Carvajal et al., Comparison of automotive FMCW and OFDM radar under interference, 2020 IEEE Radar Conference (RadarConf20), 2020. doi:10.1109/radarconf2043947.2020.9266449 [4] Radar Measurements II by Dr. Allen
