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. 10, 1993
Filed:
Jul. 21, 1992
Jimmy K Omura, Cupertino, CA (US);
Cylink Corporation, Sunnyvale, CA (US);
Abstract
A method for establishing and communicating synchronous, code division multiple access communications between a base station and a plurality of remote units. A plurality of remote-communications signals which have spread-spectrum modulation are transmitted from the plurality of remote units and arrive simultaneously at the base station. The method includes transmitting repetitively from the base station a access signal having spread-spectrum modulation and receiving the access signal at an accessing-remote unit. The accessing-remote unit transmits an echo signal which has spread-spectrum modulation. The echo signal is received at the base station and a time delay is measured between the access signal and the received echo signal. A protocol signal which has spread-spectrum modulation is transmitted to the accessing-remote unit, with the protocol signal communicating a chip codeword and the time delay measured at the base station. The accessing-remote unit adjusts a delay time such that the communications signal transmitted from the accessing-remote unit arrives simultaneously at the base station with communications signals transmitted from the plurality of remote units. The base station communicates to the plurality of remote units, with a plurality of base-communications signals. Each chip codeword of each base-communications signal is orthogonal to chip codewords of the plurality of base-communications signals. The plurality of remote-communications signals arrive simultaneously at the base station with each chip codeword of each remote-communications signal orthogonal to chip codewords of the plurality of remote-communications signals.