Devices and methods for facilitating closed-loop transmission diversity in wireless communications systems

摘要

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.

主权项

1. 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 configured 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;estimate a phase-related weight that was applied to the downlink transmission based on the downlink error rates and the uplink error rates; andcompute a threshold for antenna verification by combining thresholds associated with the I component and the Q component of the downlink transmission based on a ratio of received signal powers of the I component and the Q component.