Measured wideband HF mid-latitude channel characteristics

Author

Perry, B.D. ; Rifkin, R.

Author_Institution

Mitre Corp., Bedford, MA, USA

fYear

1989

fDate

15-18 Oct 1989

Firstpage

822

Abstract

The authors present the results of HF ionospheric channel measurements on a 2000-km midlatitude path between Florida and Massachusetts performed during September 1988 and February/March 1989 using a 1-MHz bandwidth direct-sequence-pseudonoise (DSPN) probing signal. The channel impulse response is extracted by correlating the received probe signal with a local DSPN reference. Doppler information is obtained by Fourier-transforming a succession of these impulse responses. The channel is characterized in terms of its time, its Doppler spread, and the autocorrelation and distribution functions of the received power. The data indicate that this particular channel can operate within 2 dB of the ideal matched-filter signal-to-noise ratio given (1) a decision-directed Rake modem without Doppler correction and (2) a low-overhead backlink for infrequent (a few times, a minute at most) and small (1- or 2-dB increments) transmit power adjustments

Keywords

Doppler effect; Fourier transforms; delays; electric variables measurement; interference (signal); ionospheric electromagnetic wave propagation; ionospheric techniques; radiowave propagation; telecommunication channels; 1 MHz; 2000 km; AD 1988 09; AD 1989 02 to 03; Doppler shift; E United States; February/March 1989; Florida; Fourier-transforming; HF ionospheric channel measurements; Massachusetts; September 1988; USA; autocorrelation; channel impulse response; decision-directed Rake modem; direct-sequence-pseudonoise; distribution functions; ideal matched-filter signal-to-noise ratio; low-overhead backlink; probing signal; radiowave propagation; received power; time spread; transmit power adjustments; wideband HF mid-latitude channel; Autocorrelation; Bandwidth; Data mining; Distribution functions; Hafnium; Modems; Performance evaluation; Probes; Signal to noise ratio; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Military Communications Conference, 1989. MILCOM '89. Conference Record. Bridging the Gap. Interoperability, Survivability, Security., 1989 IEEE

Conference_Location

Boston, MA

Type

conf

DOI

10.1109/MILCOM.1989.104037

Filename

104037