US6831943B1

4G,3G

Title

Code division multiple access wireless system with closed loop mode using ninety degree phase rotation and beamformer verification

Application Number:

US20000635715

Publication Date:

14-12-2004

Current Assignee:

APPLE INC

Family ID:

32965189

Application Date:

09-08-2000

Publication Country:

US

View on Espacenet

Priority Date:

13-08-1999

Declaring Company:

APPLE INC , INTEL CORP , TEXAS INSTRUMENTS INC

Abstract  Abstract

A wireless communication system ( 10). The system comprises a user station ( 12). The user station comprises despreading circuitry ( 22) for receiving and despreading a plurality of slots received from at least a first transmit antenna (A 121) and a second transmit antenna (A 122) at a transmitting station ( 14). Each of the plurality of slots comprises a first channel (DPCH) comprising a first set of pilot symbols and a second channel (PCCPCH) comprising a second set of pilot symbols. The user station further comprises circuitry ( 50) for measuring a first channel measurement (? 1n) for each given slot in the plurality of slots from the first transmit antenna and in response to the first set of pilot symbols in the given slot. The user station further comprises circuitry ( 50) for measuring a second channel measurement (? 2n) for each given slot in the plurality of slots from the second transmit antenna and in response to the first set of pilot symbols in the given slot. The user station further comprises circuitry ( 52) for measuring a phase difference value (? 2(n)) for each given slot in the plurality of slots in response to the first channel measurement and the second channel measurement for the given slot and in response to a ninety degree rotation of the given slot relative to a slot which was received by the despreading circuitry immediately preceding the given slot.

Note:

The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)

The information in grey was provided by the patent holder

The information in purple was extracted from the FrandAvenue

Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.

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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