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  Patent History
  • Application
    US 09/607749 2000-06-30
  • Granted
    US 6728295 2004-04-27
  Patent Family

granted patent: Code Division Multiple Access Communication System Using Overlapping Spread Sequences

TitleCode Division Multiple Access Communication System Using Overlapping Spread Sequences
Granted PatentUS 6728295
Granted Date2004-04-27
Priority Date2000-06-30 US 09/607749
1999-06-30 US 09/141635P
Inventors
Issue Date2004
Citation
US Patent 6728295. Washington, DC: US Patent and Trademark Office (USPTO), 2004 How to Cite?
AbstractThis 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 Identifierhttp://hdl.handle.net/10722/46516
References

 

DC FieldValueLanguage
dc.date.accessioned2007-10-30T06:51:47Z-
dc.date.available2007-10-30T06:51:47Z-
dc.date.issued2004-
dc.identifier.citationUS Patent 6728295. Washington, DC: US Patent and Trademark Office (USPTO), 2004en_HK
dc.identifier.urihttp://hdl.handle.net/10722/46516-
dc.description.abstractThis 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.extent687412 bytes-
dc.format.extent27162 bytes-
dc.format.extent21012 bytes-
dc.format.extent21377 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypetext/plain-
dc.format.mimetypetext/plain-
dc.format.mimetypetext/plain-
dc.languageengen_HK
dc.relation.isreferencedbyUS 2011179327 (A1) 2011-07-21en_HK
dc.relation.isreferencedbyUS 2003152137 (A1) 2003-08-14en_HK
dc.relation.isreferencedbyUS 6985509 (B2) 2006-01-10en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License For Public Patent Documents-
dc.titleCode Division Multiple Access Communication System Using Overlapping Spread Sequencesen_HK
dc.typePatenten_HK
dc.description.naturepublished_or_final_version-
dc.contributor.inventorNallanathan, A.en_HK
dc.contributor.inventorNg, TSen_HK
dc.contributor.inventorChan, SCen_HK
dc.contributor.inventorChow, Sen_HK
patents.identifier.applicationUS 09/607749en_HK
patents.identifier.grantedUS 6728295en_HK
patents.description.assigneeUniv Hong Kong [Hk]en_HK
patents.description.countryUnited States of Americaen_HK
patents.date.granted2004-04-27en_HK
dc.relation.referencesUS 5644523 (A) 1997-07-01en_HK
patents.identifier.hkutechidEEE-2000-00010-1-
patents.date.application2000-06-30en_HK
patents.date.priority2000-06-30 US 09/607749en_HK
patents.date.priority1999-06-30 US 09/141635Pen_HK
patents.description.ccUSen_HK
patents.relation.familyUS 6728295 (B1) 2004-04-27en_HK
patents.description.kindB1en_HK
patents.typePatent_granteden_HK

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