A Statistical Channel Model for Adaptive HF Communications via a Severely Disturbed Ionosphere

Motivation for the resurgence of interest in improving HF communication is presented. This includes the continued widespread use of the HF band, and the new technology that now makes it feasible to vastly improve the historically poor quality of communications in this band. Non-conventional HF techn...

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Bibliographic Details
Main Author: Haines, D M
Other Authors: ROME AIR DEVELOPMENT CENTER GRIFFISS AFB NY
Format: Text
Language:English
Published: 1983
Subjects:
Atmospheric Physics
Radiofrequency Wave Propagation
Non-radio Communications
*ADAPTIVE COMMUNICATIONS
*ADAPTIVE SYSTEMS
*CHANNELS
*IONOSPHERIC DISTURBANCES
*SKY WAVES
ANTENNAS
ARCTIC REGIONS
COMMUNICATION EQUIPMENT
DIGITAL SYSTEMS
DYNAMICS
FREQUENCY ALLOCATION
HIGH FREQUENCY
MATCHED FILTERS
MATHEMATICAL MODELS
MEASUREMENT
METHODOLOGY
NETWORKS
PLANNING
PROBES
PROCESSING
PULSE COMPRESSION
QUALITY
RECEIVERS
SPATIAL DISTRIBUTION
STATIONS
TIME
WAVEFORM GENERATORS
WAVEFORMS
ADAPTIVE ANTENNAS
CHANNEL MODELS
STATISTICAL MODELS
PE62702F
WURADC46001609
Arctic
Online Access:http://www.dtic.mil/docs/citations/ADA141237
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA141237
Description
Summary:Motivation for the resurgence of interest in improving HF communication is presented. This includes the continued widespread use of the HF band, and the new technology that now makes it feasible to vastly improve the historically poor quality of communications in this band. Non-conventional HF techniques or systems are classified into four general categories according to the technical specialties that spawned them. These categories are Adaptive Frequency Management. Digital Waveform Processing, Networking, and Adaptive Antennas. A 15 parameter channel model is presented which forms the basis for the on-going RADC measurement program. These parameters address the dispersion and dynamics of time, frequency and spatial distortion imposed by the skywave channel. Next, measurement techniques are evaluated for characterization of these parameters, resulting in the selection of a six station Arctic network of wideband pulse compression (matched filter) channel probes. A description of waveform generation, receiver signal processing and the program plans and schedule are presented.

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