US6141332A

3G

Title

ORTHOGONAL CODE SYNCHRONIZATION SYSTEM AND METHOD FOR SPREAD SPECTRUM CDMA COMMUNICATIONS

Application Number:

US19990280327

Publication Date:

31-10-2000

Current Assignee:

INTERDIGITAL INC

Family ID:

25195867

Application Date:

29-03-1999

Publication Country:

US

View on Espacenet

Priority Date:

28-02-1997

Declaring Company:

INTERDIGITAL INC

Abstract  Abstract

A cellular radio system in which a base station receiver can receive on the reverse link data from a mobile terminal in one of four control modes. In the first mode the mobile terminal sends an independent user pilot not synchronized with the base station on the reverse link and the user data channel is synchronized to this independent user pilot. In the second mode the mobile terminal slaves its user pilot to the pilot it receives from the base station and the user data channel is synchronized with this slaved user pilot. This second mode allows the user terminal to receive round trip delay information for purposes of geolocation and rapid reacquisition. In the third mode the mobile terminal slaves its user pilot to the incoming base station pilot as in the case of mode two but the user data channel operates in the orthogonal mode using the ranging information received from the base station. The phase relationship between the user pilot channel and the user data channel is calibrated. The user pilot carrier is also the carrier for the user data channel and can be used as the carrier reference for detecting the user data channel. In the fourth mode the slaved pilot implementation of mode three is used for acquisition but after acquisition the user pilot code is phase shifted to be synchronous with the user data channel thus also making it an orthogonal channel. In this mode the pilots no longer contribute interference to the user data channels within the cell and can be transmitted at higher power levels.

Note:

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The information in grey was provided by the patent holder

The information in purple was extracted from the FrandAvenue

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Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.

Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.

Family member:related patents or applications that share a common priority or original filing.

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