12-chip coded spread spectrum modulation for direct conversion radio architecture in a digital cordless telephone
December 6, 2015. 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 ReferencesData communication code Correlation data communications system Spread spectrum modem Correlation data communications system Bi-directional data telemetry system Zero IF radio receiver apparatus Distribution energy management system Digital cordless telephone systems Radio communication system using spread spectrum techniques System and method for generating signal waveforms in a CDMA cellular telephone system InventorAssigneeApplicationNo. 568047 filed on 12/06/1995US Classes:375/152, Matched-filter-type receiver455/462, Including private cordless extension system455/465Including public cordless extension systemExaminersPrimary: Chin, StephenAssistant: Gluck, Jeffrey W. Attorney, Agent or FirmInternational ClassesH04B 001/707H04M 001/19 H04M 011/00 AbstractA cordless direct sequence spread spectrum telephone using a direct conversion radio architecture wherein the code sequence used for spreading and despreading is an even code sequence to prevent addition of low frequency noise in the down-conversion process, the preferred even code being a 12-chip code and, more particularly, being an even 12-chip code that is generated by adding one bit to an inverted, shifted, and/or reversed 11-chip Barker sequence.Other References
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