Title :
Comments on "OFDM Transmission for Time-Based Range Estimation"
Author :
Martin, Richard K.
Author_Institution :
Dept. of Electr. & Comput. Eng., Air Force Inst. of Technol. (AFIT), Wright-Patterson AFB, OH, USA
Abstract :
The letter by Wang and Fattouche makes the claim that the Cramer-Rao lower bound (CRLB) for range estimation using orthogonal frequency division multiplexing (OFDM) signals is 4.8 dB lower than that of pseudo-noise (PN) signals. However, this is not the case. The sole reason for the 4.8 dB gain in the said letter is due to the fact that the authors implicitly used an uncommon pulse shaping filter in the digital-to-analog conversion process for the PN signal.
Keywords :
digital-analogue conversion; frequency division multiplexing; pulse shaping; Cramer-Rao lower bound; OFDM signals; OFDM transmission; digital-to-analog conversion process; gain 4.8 dB; orthogonal frequency division multiplexing; pseudo-noise signals; pulse shaping filter; time-based range estimation; Approximation methods; Bandwidth; Estimation; Materials; OFDM; Shape;
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2010.2098399
