title: Phase-coherent communications without explicit phase tracking.
abstract: Phase-coherent communications typically requires a reliable phase-tracking algorithm. An initial phase estimate with training symbols allows a receiver to compensate for a motion-induced Doppler shift. Following the training period, however, explicit phase tracking can be avoided in time reversal communications that has been implemented on a block-by-block basis to accommodate time-varying channels. This is accomplished by a smaller block size and adaptive channel estimation using previously detected symbols on a symbol-by-symbol basis. The proposed time reversal approach without explicit phase tracking is demonstrated using experimental data (12-20 kHz) in shallow water.
authors.affiliation: Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093-0238, USA.
authors.forename: H C
authors.initials: HC
authors.lastname: Song
authors.forename: W S
authors.initials: WS
authors.lastname: Hodgkiss
authors.forename: P A
authors.initials: PA
authors.lastname: van Walree
mesh_terms: D000465:Algorithms; D004301:Doppler Effect; D008962:Models, Theoretical; D009038:Motion; D009792:Oceans and Seas; D011825:Radar; D012623:Seawater; D013018:Sound Spectrography; D013997:Time Factors; D014465:Ultrasonics