A comparison of adaptive equalization methods for multiuser detection in OFDM-SS systems
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- Rui Liu
- Dr Graeme Chester
- Professor Bayan Sharif
- Yi Yi
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| Author(s) | | Sharif BS; Chester EG; Yi SJ; Liu R |
| Editor(s) | | |
| Publication type | | Conference Proceedings (inc. Abstract) |
| Conference Name | | Ninth International Conference on HF Radio Systems and Techniques |
| Conference Location | | Bath, UK |
| Year of Conference | | 2003 |
| Date | | 23-26 June 2003 |
| Volume | | 493 |
| Pages | | 102-107 |
| ISBN | | 0852967551 |
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| Full text for this publication is not currently held within this repository. Alternative links are provided below where available. |
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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). |
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| Publisher | | IEEE |
| URL | | http://dx.doi.org/10.1049/cp:20030438 |
| DOI | | 10.1049/cp:20030438 |
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| Library holdings | | Search Newcastle University Library for this item |
