Digital Troposcatter: State-of-the-Art Modulation Techniques.
ARMY ELECTRONICS COMMAND FORT MONMOUTH NJ
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This report concerns a survey of state-of-the-art modulation techniques used for the transmission of high speed digital data over strategic troposcatter communications links. These links are characterized by conditions of dispersive multipath, selective fading, and severe path loss. It is shown that four level phase shift keying is a relatively optimum technique in order to obtain data packing of one bit per Hertz with relatively simple implementation. An overview of all promising anti-multipath techniques including time gating, parallel processing, adaptive equalization, and Viterbi decoding is given in the context of performance evaluation and risk assessment.
- Electricity and Magnetism
- Radio Communications