An Improved Overloading Scheme for Downlink CDMA
<p/> <p>An improved overloading scheme is presented for single-user detection in the downlink of multiple-access systems based on OCDMA/OCDMA (O/O). By displacing in time the orthogonal signatures of the two user sets that make up the overloaded system, the cross-correlation between the...
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Series: | EURASIP Journal on Advances in Signal Processing |
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Online Access: | http://dx.doi.org/10.1155/ASP.2005.604 |
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doaj-98ad9f7a740847c69595a9cbcf5e20372020-11-25T00:05:20ZengSpringerOpenEURASIP Journal on Advances in Signal Processing1687-61721687-61802005-01-0120055387618An Improved Overloading Scheme for Downlink CDMAVanhaverbeke FrederikMoeneclaey Marc<p/> <p>An improved overloading scheme is presented for single-user detection in the downlink of multiple-access systems based on OCDMA/OCDMA (O/O). By displacing in time the orthogonal signatures of the two user sets that make up the overloaded system, the cross-correlation between the users of the two sets is reduced. For random O/O with square-root cosine rolloff chip pulses, the multiuser interference can be decreased by up to 50% (depending on the chip pulse bandwidth) as compared to quasiorthogonal sequences (QOS) that are presently part of the downlink standard of Cdma2000. This reduction of the multiuser interference gives rise to an increase of the achievable signal-to-interference-plus-noise ratio for a particular channel load.</p>http://dx.doi.org/10.1155/ASP.2005.604CDMAquasiorthogonal sequencesdownlink transmissionoversaturated channelspower control |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Vanhaverbeke Frederik Moeneclaey Marc |
spellingShingle |
Vanhaverbeke Frederik Moeneclaey Marc An Improved Overloading Scheme for Downlink CDMA EURASIP Journal on Advances in Signal Processing CDMA quasiorthogonal sequences downlink transmission oversaturated channels power control |
author_facet |
Vanhaverbeke Frederik Moeneclaey Marc |
author_sort |
Vanhaverbeke Frederik |
title |
An Improved Overloading Scheme for Downlink CDMA |
title_short |
An Improved Overloading Scheme for Downlink CDMA |
title_full |
An Improved Overloading Scheme for Downlink CDMA |
title_fullStr |
An Improved Overloading Scheme for Downlink CDMA |
title_full_unstemmed |
An Improved Overloading Scheme for Downlink CDMA |
title_sort |
improved overloading scheme for downlink cdma |
publisher |
SpringerOpen |
series |
EURASIP Journal on Advances in Signal Processing |
issn |
1687-6172 1687-6180 |
publishDate |
2005-01-01 |
description |
<p/> <p>An improved overloading scheme is presented for single-user detection in the downlink of multiple-access systems based on OCDMA/OCDMA (O/O). By displacing in time the orthogonal signatures of the two user sets that make up the overloaded system, the cross-correlation between the users of the two sets is reduced. For random O/O with square-root cosine rolloff chip pulses, the multiuser interference can be decreased by up to 50% (depending on the chip pulse bandwidth) as compared to quasiorthogonal sequences (QOS) that are presently part of the downlink standard of Cdma2000. This reduction of the multiuser interference gives rise to an increase of the achievable signal-to-interference-plus-noise ratio for a particular channel load.</p> |
topic |
CDMA quasiorthogonal sequences downlink transmission oversaturated channels power control |
url |
http://dx.doi.org/10.1155/ASP.2005.604 |
work_keys_str_mv |
AT vanhaverbekefrederik animprovedoverloadingschemefordownlinkcdma AT moeneclaeymarc animprovedoverloadingschemefordownlinkcdma AT vanhaverbekefrederik improvedoverloadingschemefordownlinkcdma AT moeneclaeymarc improvedoverloadingschemefordownlinkcdma |
_version_ |
1725425529588285440 |