Spread spectrum wireless PBX
Patent 4672658 Issued on June 9, 1987. Estimated Expiration Date: 
October 23, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 23, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesComprehensive automatic mobile radio telephone system Spread spectrum communications method and apparatus Telephone transmission system on a road-vehicle Apparatus for use with key telephone system with wireless telephone device Correlation detectors for use in direct sequence spread spectrum signal receiver Patent #: 4561089 InventorsAssigneeApplicationNo. 06/921837 filed on 10/23/1986US Classes:455/555, Wireless private branch exchange (PBX) (i.e., wireless link to extension unit)370/342, Combining or distributing information via code word channels using multiple access techniques (e.g., CDMA)375/143, Having matched-filter-type receiver375/153, Having SAW or charge-transfer device375/219, TRANSCEIVERS375/220, Transmission interface between two stations or terminals375/347, Diversity (frequency or time)375/349Plural signal paths in receiverExaminersPrimary: Rubinson, Gene Z.Assistant: Ham, Mark E. Attorney, Agent or FirmInternational ClassesH04B 1/707 (20060101)H04Q 7/26 (20060101) H04Q 11/00 (20060101) AbstractThe present invention relates to a wireless PBX network wherein direct sequence spread spectrum multiple access is used for voice and data communications to support a plurality of local-local and local-external calls. The present wireless PBX arrangement comprises a plurality of local user transceivers using a first separate unique chip sequence patterns for information communication and a second common chip sequence pattern for call-set up; and a central PBX comprising (a) a plurality of PBX transceivers, each of which uses a separate first chip sequence pattern which is matched to a corresponding local user transceiver; (b) a switching means for interconnecting local users to each other or to an external network via the associated PBX transceivers; and (c) a call set-up receiver responsive solely to initial call set-up information sent by any user using the second common chip sequence pattern. Optional selection diversity or equal gain combining diversity and/or error correction encoding may also be included in the transceivers.Other References
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