THE STUDY OF SPACE COMMUNICATIONS SPREAD SPECTRUM SYSTEMS. PART II: TRELLIS CODING FOR NONCOHERENT FREQUENCY-HOPPED COMMUNICATIONS SYSTEMS

Authors
  1. Wearring, M.G.
  2. Wittke, P.H.
Corporate Authors
Queen's Univ, Kingston ONT (CAN) Dept of Electrical Engineering;Communications Research Centre, Ottawa ONT (CAN)
Abstract
In noncoherent frequency hopped spread spectrum communication systems, M-ary frequency shift keying (FSK) is the usual form of modulation. In the paper, coded systems are studied which consist of convolutional codes with the codewords mapped onto multiple tone signal sets. The signals employ the same set of orthogonal tones as M-ary FSK, but several tones may be transmitted simultaneously. This allows an increase in the number of signals, to accommodate the redundant information introduced by the coding, without any bandwidth expansion. Some of Ungerboeck's rules for assigning signals to the trellis branches are employed. The results were obtained for transmission over an additive white Gaussian noise channel with both coherent and noncoherent detection. Viterbi decoding was used, with both hard and soft decoding metrics. Simulation results and error bounds are presented. TRUNCATED
Report Number
QU,K-DEE-88-5 — Contractor Report (Final)
Date of publication
15 Mar 1988
Number of Pages
93
DSTKIM No
88-04415
CANDIS No
57615
Format(s):
Hardcopy;Originator's fiche received by DSIS

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