Investigation of Sequence Segment Keying (SSK) and its Application in CDMA Systems

Honary, Bahram and Marple, Steven (1996) Investigation of Sequence Segment Keying (SSK) and its Application in CDMA Systems. In: ITEC 96, 1996-04-01.

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Abstract

The principal research areas of this project (for Lancaster University) are:(I) investigation of optimum decoder synthesis for Sequence-Segment Keying (SSK), taking into account diversity;(ii) investigation of optimum error control schemes for use in SSK-type systems;(iii) investigation of variable-significance SSK, adaptive in response to nature of source information.Progress:To date (Lancaster):The optimum decoder synthesis is a balance against performance and complexity (both time and space complexity). This balance has been investigated by comparing the relative decoder complexities of hard-decision decoders; Euclidean, Berlekamp-Massey and High-Speed Step-by-Step decoders have been implemented in C++. The complexity evaluation was based upon the number of Galois field operations performed, with each operation weighted according to the projected execution time on a DSP. The decoders were also compared against a minimum-weight decoder under the same criteria. It was found that while High-Speed Step-by-step is an improvement over conventional step-by-step decoding Euclidean and Berlekamp are less complex (and still retain (hard-decision) maximum likelihood decoding). Minimum-weight decoding is the least complex but is not maximum-likelihood. A soft-maximum-likelihood trellis decoder has been implemented in C++. Currently work is progressing to extend this to the decoding of Reed-Solomon codes, allowing a comparison of decoder complexity against the decoders already discussed.

Item Type: Contribution to Conference (Paper)
Journal or Publication Title: ITEC 96
Departments: Faculty of Science and Technology > School of Computing & Communications
Faculty of Science and Technology > Physics
ID Code: 61207
Deposited By: ep_importer_pure
Deposited On: 06 Feb 2013 15:11
Refereed?: No
Published?: Published
Last Modified: 20 Oct 2019 03:55
URI: https://eprints.lancs.ac.uk/id/eprint/61207

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