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Soft decision decoding in fast frequency hopping systems with convolutional codes and turbo codes

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2 Author(s)
U. -C. G. Fiebig ; Inst. for Commun. Technol., German Aerosp. Res. Establ., Wessling, Germany ; P. Robertson

The purpose of this paper is to show how reliability information on each received bit can be derived to enable soft decision decoding for coded fast frequency hopping/multiple frequency shift keying (FFH/MFSK) multiple-access systems. Convolutional codes as well as turbo codes are considered and their performance is compared to that of previously proposed Reed-Solomon (RS) codes. A mobile radio environment yielding a frequency selective fading channel is assumed. It is shown that the application of turbo codes and convolutional codes with soft decision decoding can allow for a considerably higher number of simultaneously transmitting users than RS codes or uncoded systems. To achieve these throughput gains, however, the calculation of soft decisions after de-spreading is mandatory; the pertinent technique is described in the paper

Published in:

Communications, 1996. ICC '96, Conference Record, Converging Technologies for Tomorrow's Applications. 1996 IEEE International Conference on  (Volume:2 )

Date of Conference:

23-27 Jun 1996