The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 21, 2001
Filed:
Feb. 25, 1998
James Gifford Evans, Forked River, NJ (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
A digital portable telephone is configured without the complex circuitry normally required for its base unit and handset unit to switch between transmit and receive states while frequency hopping in a frequency hopping system. The architecture for this digital portable telephone provides improved performance over that of other digital portable telephones by combining the frequency hopping spread spectrum technique with other spread spectrum techniques in communications between the handset unit and the base unit. Specifically, delta modulation and a redundant transmission of the signal are the other forms of signal spreading that are employed. Such signal spreading advantageously achieves additional processing gain. Another attractive attribute of this architecture is a high level of immunity to interference from other portable telephones also operating in the same frequency hopping band. Finally, the circuit architecture is simplified and the cost for a portable telephone employing simplified circuits is less than a portable telephone employing circuitry required to switch between transmit and receive states while frequency hopping in a frequency hopping system.