Title :
A unique, robust low-rate HF radio modem
Author :
Scholz, Jason B. ; Giles, Timothy C. ; Gill, Martin C.
Author_Institution :
Defense Sci. & Technol. Organ., Salisbury, SA, Australia
Abstract :
Military HF radio modems are required to operate over a broad range of adverse channel conditions such as severe multipath and fading, partial-band and carrier-wave interference as well as Gaussian and impulsive noise. The theory of operation and simulation results for a modem capable of providing reliable, low error rate performance in the presence of these harsh forms of interference and distortion is described. The detection is maximum likelihood and is based on a partial-band noise/interference model and the assumption of slow fading. Rejection of interference is facilitated by processing in time and frequency domains. An implementation, allowing a data rate of 75 bits/s, which uses a PSK modulated carrier swept over a 3 kHz bandwidth is described in detail. Simulation results with carrier wave (CW) interference, multipath distortion, Gaussian and impulse noise conditions are presented, demonstrating the exceptional detection performance attainable
Keywords :
Gaussian noise; electric distortion; fading; interference suppression; maximum likelihood detection; military communication; modems; multipath channels; phase shift keying; radio reception; 3 kHz; 75 bit/s; PSK; carrier-wave interference; detection performance; impulse noise; low-rate HF radio modem; maximum likelihood detection; multipath distortion; partial-band noise/interference model; simulation; slow fading; Error analysis; Fading; Frequency domain analysis; Gaussian noise; Hafnium; Interference; Maximum likelihood detection; Modems; Noise robustness; Reliability theory;
Conference_Titel :
Military Communications Conference, 1993. MILCOM '93. Conference record. Communications on the Move., IEEE
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-0953-7
DOI :
10.1109/MILCOM.1993.408495
