Accession Number : ADA331647

Title :   An Unconventional, Highly Multipath-Resistant, Modulation Scheme

Corporate Author : MITRE CORP MCLEAN VA JASON PROGRAM OFFICE

Personal Author(s) : Press, W. ; Dally, W. ; Eardley, D. ; Garwin, R. ; Horowitz, P.

PDF Url : ADA331647

Report Date : SEP 1997

Pagination or Media Count : 42

Abstract : We have shown that hypercarrier modulation with binary on/off keying, and with bit times longer than the whole "ringing time" of the urban environment, is potentially capable of achieving megabit per second data rates in a manner that is completely insensitive to multipath fading. A straw-man design, using current COTS components, has been presented. While we would not want to claim that this design is exactly optimal (or even completely correct), it illustrates that brassboard tests should neither be difficult, nor expensive. The scheme proposed here is sufficiently different from conventional high bitrate modulation methods, that it should be quite difficult for an adversary to recognize as such. Indeed, with sufficient spreading and good operational practice, it should escape detection completely.

Descriptors :   *TRANSMISSION LOSS, *MULTIPATH TRANSMISSION, SIGNAL PROCESSING, DATA RATE, PHASE SHIFT KEYERS, PHASE MODULATION, FADING(ELECTROMAGNETIC WAVES).

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE