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A comparison of adaptive equalization methods for multiuser detection in OFDM-SS systems

Lookup NU author(s): Rui Liu, Dr Graeme Chester, Professor Bayan Sharif, Yi Yi


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Data transmission over HF channels is subject to phenomena of dispersion, absorption and multiple paths. Performance may be improved by using orthogonal frequency division multiplexing spread spectrum (OFDM-SS) systems. In OFDM-SS systems, transmitting data over slowly varying multi-path channels, both intersymbol interference (ISI) and multiple-access interference (MAI) arise and should therefore be mitigated. Two adaptive nonlinear equalization architectures based on the minimum mean-square error (MMSE) criterion are proposed and examined over such channels. The first receiver architecture is for single-user detection (SUD) consisting of a multiple-layer feed-forward filter (ML-FFF) and a feedback filter (FBF). The ML-FFF acts as a multipath diversity combiner as well as canceller of precursor ISI and main-cursor MAI while the FBF acts as a canceller of post-cursor ISI. The second receiver architecture is for multiuser detection (MUD) where in addition to the first structure, it employs a centralized FBF (CFBF) for cancelling the MAI of previous symbols. Results indicate that an enhancement in capacity is obtained by the multi-user structure over the single-user structure. Additionally, it is demonstrated that both structures perform multipath energy combining (RAKE-like) when the delay spread is in excess of a symbol interval. (8 References).

Publication metadata

Author(s): Sharif BS; Chester EG; Yi SJ; Liu R

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: Ninth International Conference on HF Radio Systems and Techniques

Year of Conference: 2003

Pages: 102-107

ISSN: 0537-9989

Publisher: IEEE


DOI: 10.1049/cp:20030438

Library holdings: Search Newcastle University Library for this item

ISBN: 0852967551