Patent ID: 7324617

Claim:
A mobile device that is arranged to support downlink transmission diversity from transmission frames that includes m slots, the mobile device comprising: a network link that is arranged to receive signals from the transmission frame including a pilot channel signal and a sync channel signal; and a transmit diversity application that is configured to: concurrently apply a non-diversity detection algorithm and a diversity detection algorithm to the received signals to produce a non-diversity result metric and a diversity result metric, respectively, wherein each respective algorithm is arranged to produce the respective result metric by: descrambling the pilot channel signal to identify a descrambled signal; despreading the synch channel signal to identify a despreaded signal; derotating the despreaded signal with the a complex conjugate of the descrambled signal; and identifying the result metric from the derotated and despreaded signal; compare the non-diversity result metric with the diversity result metric; and determine downlink transmit diversity usage of the signal based on a phase comparison of the non-diversity result metric and the diversity result metric.