THE STUDY OF SPACE COMMUNICATIONS SPREAD SPECTRUM SYSTEMS (PHASE IV)

Authors
  1. Wittke, P.H.
  2. McLane, P.J.
  3. Simmons, S.J.
  4. Wearring, M.G.
  5. Lam, Y.M.
  6. Hopkins, W.
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 this report, 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 of this study were obtained from simulation of transmission over an additive white Gaussian noise channel. Viterbi decoding was used, with both hard and soft decoding metrics. Performance was measured as the energy per bit to noise spectral density ratio (E sub b/N sub 0) at a bit error rate (BER) of E-4. TRUNCATED
Report Number
87-1 — Contractor Report; Progress Report (Interim)
Date of publication
15 Jun 1987
Number of Pages
165
DSTKIM No
88-01753
CANDIS No
54984
Format(s):
Microfiche filmed at DSIS;Originator's fiche received by DSIS;Hardcopy

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