Devices and methods for facilitating closed-loop transmission diversity in wireless communications systems
AssigneeQUALCOMM Incorporated
InventorsNate Chizgi, Wei Zhang
Life of this patent
Estimating the term…
Abstract
Access terminals are adapted to facilitate closed-loop transmit diversity in wireless communications systems. According to one example, an access terminal can calculate an uplink error rate for even slot indexes and a separate uplink error rate for odd slot indexes in an uplink frame to be transmitted. A respective downlink error rate can be estimated for an in-phase (I) component and a quadrature-phase (Q) component of a downlink transmission. The access terminal may further estimate a phase-related weight that was applied to the downlink transmission based on the downlink error rates and the uplink error rates. Other aspects, embodiments, and features are also included.
Claims28
An access terminal, comprising:
- a communications interface;
- a storage medium;
- and
- a processing circuit coupled to the communications interface and the storage medium, the processing circuit adapted to:
- calculate an uplink error rate for even slot indexes and a separate uplink error rate for odd slot indexes in an uplink frame to be transmitted via the communications interface;
- estimate a respective downlink error rate for an in-phase (I) component and a quadrature-phase (Q) component of a downlink transmission;
- and
- estimate a phase-related weight that was applied to the downlink transmission based on the downlink error rates and the uplink error rates.
A method operational on an access terminal, comprising:
- computing an uplink error rate for even slot indexes and a separate uplink error rate for odd slot indexes in an uplink frame to be transmitted by the access terminal;
- estimating a respective downlink error rate for an in-phase (I) component and a quadrature-phase (Q) component of a downlink transmission;
- and
- estimating a phase-related weight that was applied to the downlink transmission based on the downlink error rates and the uplink error rates.
An access terminal, comprising:
- means for computing an uplink error rate for even slot indexes and a separate uplink error rate for odd slot indexes in an uplink frame to be transmitted by the access terminal;
- means for estimating a respective downlink error rate for an in-phase (I) component and a quadrature-phase (Q) component of a downlink transmission;
- and
- means for estimating a phase-related weight that was applied to the downlink transmission based on the downlink error rates and the uplink error rates.
A processor-readable storage medium, comprising programming for causing a processing circuit to:
- calculate an uplink error rate for even slot indexes and a separate uplink error rate for odd slot indexes in an uplink frame to be transmitted by an access terminal;
- estimate a respective downlink error rate for an in-phase (I) component and a quadrature-phase (Q) component of a downlink transmission;
- and
- estimate a phase-related weight that was applied to the downlink transmission based on the downlink error rates and the uplink error rates.
Dependencies are inferred from the claim text.