Overloaded CDMA Systems with Displaced Binary Signatures
<p>We extend three types of overloaded CDMA systems, by displacing in time the binary signature sequences of these systems: (1) random spreading (PN), (2) multiple-OCDMA (MO), and (3) PN/OCDMA (PN/O). For each of these systems, we determine the time shifts that minimize the overall multiuser i...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2004-01-01
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| Series: | EURASIP Journal on Wireless Communications and Networking |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1155/S168714720440601X |
| _version_ | 1819202176869728256 |
|---|---|
| author | Vanhaverbeke Frederik Moeneclaey Marc |
| author_facet | Vanhaverbeke Frederik Moeneclaey Marc |
| author_sort | Vanhaverbeke Frederik |
| collection | DOAJ |
| description | <p>We extend three types of overloaded CDMA systems, by displacing in time the binary signature sequences of these systems: (1) random spreading (PN), (2) multiple-OCDMA (MO), and (3) PN/OCDMA (PN/O). For each of these systems, we determine the time shifts that minimize the overall multiuser interference power. The achievable channel load with coded and uncoded data is evaluated for the conventional (without displacement) and improved (with displacement) systems, as well as for systems based on quasi-Welch-bound-equality (QWBE) sequences, by means of several types of turbo detectors. For each system, the best performing turbo detector is selected in order to compare the performance of these systems. It is found that the improved systems substantially outperform their original counterparts. With uncoded data, (improved) PN/O yields the highest acceptable channel load. For coded data, MO allows for the highest acceptable channel load over all considered systems, both for the conventional and the improved systems. In the latter case, channel loads of about 280% are achievable with a low degradation as compared to a single user system.</p> |
| first_indexed | 2024-12-23T03:59:52Z |
| format | Article |
| id | doaj.art-8b7684c20d3c4dd4965339cda566e15c |
| institution | Directory Open Access Journal |
| issn | 1687-1472 1687-1499 |
| language | English |
| last_indexed | 2024-12-23T03:59:52Z |
| publishDate | 2004-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | EURASIP Journal on Wireless Communications and Networking |
| spelling | doaj.art-8b7684c20d3c4dd4965339cda566e15c2022-12-21T18:00:46ZengSpringerOpenEURASIP Journal on Wireless Communications and Networking1687-14721687-14992004-01-0120041161171Overloaded CDMA Systems with Displaced Binary SignaturesVanhaverbeke FrederikMoeneclaey Marc<p>We extend three types of overloaded CDMA systems, by displacing in time the binary signature sequences of these systems: (1) random spreading (PN), (2) multiple-OCDMA (MO), and (3) PN/OCDMA (PN/O). For each of these systems, we determine the time shifts that minimize the overall multiuser interference power. The achievable channel load with coded and uncoded data is evaluated for the conventional (without displacement) and improved (with displacement) systems, as well as for systems based on quasi-Welch-bound-equality (QWBE) sequences, by means of several types of turbo detectors. For each system, the best performing turbo detector is selected in order to compare the performance of these systems. It is found that the improved systems substantially outperform their original counterparts. With uncoded data, (improved) PN/O yields the highest acceptable channel load. For coded data, MO allows for the highest acceptable channel load over all considered systems, both for the conventional and the improved systems. In the latter case, channel loads of about 280% are achievable with a low degradation as compared to a single user system.</p>http://dx.doi.org/10.1155/S168714720440601Xoversaturated channelstotal squared correlationCDMArandom spreadinginterference cancellationturbo detection |
| spellingShingle | Vanhaverbeke Frederik Moeneclaey Marc Overloaded CDMA Systems with Displaced Binary Signatures EURASIP Journal on Wireless Communications and Networking oversaturated channels total squared correlation CDMA random spreading interference cancellation turbo detection |
| title | Overloaded CDMA Systems with Displaced Binary Signatures |
| title_full | Overloaded CDMA Systems with Displaced Binary Signatures |
| title_fullStr | Overloaded CDMA Systems with Displaced Binary Signatures |
| title_full_unstemmed | Overloaded CDMA Systems with Displaced Binary Signatures |
| title_short | Overloaded CDMA Systems with Displaced Binary Signatures |
| title_sort | overloaded cdma systems with displaced binary signatures |
| topic | oversaturated channels total squared correlation CDMA random spreading interference cancellation turbo detection |
| url | http://dx.doi.org/10.1155/S168714720440601X |
| work_keys_str_mv | AT vanhaverbekefrederik overloadedcdmasystemswithdisplacedbinarysignatures AT moeneclaeymarc overloadedcdmasystemswithdisplacedbinarysignatures |