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Improved HF modem using convolutional coding.

Research output: Contribution to Journal/MagazineJournal article

<mark>Journal publication date</mark>1992
<mark>Journal</mark>Electronics and Communication Engineering Journal
Issue number2
Number of pages10
Pages (from-to)73-82
Publication StatusPublished
<mark>Original language</mark>English


The paper describes the design of a digitally implemented modem for use over HF (2-30 MHz) radio channels. As a completely digital approach offers the prospect of a number of significant improvements, a new digital multifrequency-shift-keying (MFSK) modem has been developed that employs a novel digital processing procedure termed code-assisted bit synchronisation (CABS). Signal detection is achieved via a set of noncoherent correlators, whilst symbol synchronisation and error correction are performed using a soft-decision Viterbi decoder. Practical tests of modem show that it operates effectively under both additive white Gaussian noise and real HF channel conditions.