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Patent History
- ApplicationUS 09/607749 2000-06-30
- GrantedUS 6728295 2004-04-27
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granted patent: Code Division Multiple Access Communication System Using Overlapping Spread Sequences
Title | Code Division Multiple Access Communication System Using Overlapping Spread Sequences |
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Granted Patent | US 6728295 |
Granted Date | 2004-04-27 |
Priority Date | 2000-06-30 US 09/607749 1999-06-30 US 09/141635P |
Inventors | |
Issue Date | 2004 |
Citation | US Patent 6728295. Washington, DC: US Patent and Trademark Office (USPTO), 2004 How to Cite? |
Abstract | This Invention Discloses A Code Division Multiple Access Communications System Based On Spread Sequences Designed By Using Complete Factorization Of Polyphase Matrix Of A Perfect Reconstruction (Pr) Filter Bank. The Key Characteristic Is That The Length Of The Spread Sequence Is Longer Than The Period Of The Data Symbol I.E., The Data Symbols Are Spreaded By The Spread Sequence And Overlapped With Neighboring Data Symbols. The Design Method Includes An Orthogonal Code Generator, A Number Of Cascading Stages And Random Permutation Matrices. The Number Of Cascading Stages And Random Permutation Matrices Are Selected According To The Length Of The Spread Sequence Required. The Length Of The Spread Sequence Could Be Selected According To The System Performance Requirement, Hence The Overlapping Factor Of Spreaded Data Symbols. Furthermore, This Spread Sequence Assumes Integer Values Instead Of Binary When The Orthogonal Code Generator Generates A Walsh-Hadamard Code. The Number Of Integer Values Level Could Be Limited By Employing Proper Permutation Matrices. This Spread Sequence Generation Method Could Be Implemented Using Simple Integer Arithmetic. Furthermore, This Spread Sequences Are Highly Secured Since Random Permutation Matrices Are Used. |
Persistent Identifier | http://hdl.handle.net/10722/46516 |
References |
DC Field | Value | Language |
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dc.date.accessioned | 2007-10-30T06:51:47Z | - |
dc.date.available | 2007-10-30T06:51:47Z | - |
dc.date.issued | 2004 | - |
dc.identifier.citation | US Patent 6728295. Washington, DC: US Patent and Trademark Office (USPTO), 2004 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/46516 | - |
dc.description.abstract | This Invention Discloses A Code Division Multiple Access Communications System Based On Spread Sequences Designed By Using Complete Factorization Of Polyphase Matrix Of A Perfect Reconstruction (Pr) Filter Bank. The Key Characteristic Is That The Length Of The Spread Sequence Is Longer Than The Period Of The Data Symbol I.E., The Data Symbols Are Spreaded By The Spread Sequence And Overlapped With Neighboring Data Symbols. The Design Method Includes An Orthogonal Code Generator, A Number Of Cascading Stages And Random Permutation Matrices. The Number Of Cascading Stages And Random Permutation Matrices Are Selected According To The Length Of The Spread Sequence Required. The Length Of The Spread Sequence Could Be Selected According To The System Performance Requirement, Hence The Overlapping Factor Of Spreaded Data Symbols. Furthermore, This Spread Sequence Assumes Integer Values Instead Of Binary When The Orthogonal Code Generator Generates A Walsh-Hadamard Code. The Number Of Integer Values Level Could Be Limited By Employing Proper Permutation Matrices. This Spread Sequence Generation Method Could Be Implemented Using Simple Integer Arithmetic. Furthermore, This Spread Sequences Are Highly Secured Since Random Permutation Matrices Are Used. | en_HK |
dc.format.extent | 687412 bytes | - |
dc.format.extent | 27162 bytes | - |
dc.format.extent | 21012 bytes | - |
dc.format.extent | 21377 bytes | - |
dc.format.mimetype | application/pdf | - |
dc.format.mimetype | text/plain | - |
dc.format.mimetype | text/plain | - |
dc.format.mimetype | text/plain | - |
dc.language | eng | en_HK |
dc.relation.isreferencedby | US 2011179327 (A1) 2011-07-21 | en_HK |
dc.relation.isreferencedby | US 2003152137 (A1) 2003-08-14 | en_HK |
dc.relation.isreferencedby | US 6985509 (B2) 2006-01-10 | en_HK |
dc.title | Code Division Multiple Access Communication System Using Overlapping Spread Sequences | en_HK |
dc.type | Patent | en_HK |
dc.description.nature | published_or_final_version | - |
dc.contributor.inventor | Nallanathan, A. | en_HK |
dc.contributor.inventor | Ng, TS | en_HK |
dc.contributor.inventor | Chan, SC | en_HK |
dc.contributor.inventor | Chow, S | en_HK |
patents.identifier.application | US 09/607749 | en_HK |
patents.identifier.granted | US 6728295 | en_HK |
patents.description.assignee | Univ Hong Kong [Hk] | en_HK |
patents.description.country | United States of America | en_HK |
patents.date.granted | 2004-04-27 | en_HK |
dc.relation.references | US 5644523 (A) 1997-07-01 | en_HK |
patents.identifier.hkutechid | EEE-2000-00010-1 | - |
patents.date.application | 2000-06-30 | en_HK |
patents.date.priority | 2000-06-30 US 09/607749 | en_HK |
patents.date.priority | 1999-06-30 US 09/141635P | en_HK |
patents.description.cc | US | en_HK |
patents.relation.family | US 6728295 (B1) 2004-04-27 | en_HK |
patents.description.kind | B1 | en_HK |
patents.type | Patent_granted | en_HK |