METHOD AND SYSTEM FOR USE OF QUADRATURE HYBRIDS FOR CLOSED AND OPEN LOOP BEAM FORMING TRANSMIT DIVERSITY

摘要

The present implementation is directed to a system and method of mobile transmit diversity and, more particularly, to a device which can operate in any of several modes, including a transmit diversity mode whereby two or more antennae transmit signals to at least one base station with relative phase difference, or in a non-diversity mode whereby one antenna is turned off and the other transmits at full or requisite power.

主权项

1. A method for a multi-mode mobile device in a mobile communication system to transmit signals to a base station, where said device includes a phase shifter, a power combiner/divider, and a plurality of antennae with each antenna coupled to a power amplifier, comprising the steps of:
providing a plurality of signals to said power combiner/divider for adjusting the power level of each signal in a plurality of signals, delivering one of each of said signals to a different antenna in said plurality of antennae, transmitting a single non-diversity mode signal wherein one signal is provided with full power and other signals in said plurality of signals are provided with no power, after said device receives a discernable indicator that said single signal was received, transmitting a diversity mode signal set in which said power combiner/divider adjusts the power level of each signal in said plurality of signals and a phase shifter determines the need to adjust the relative phase of said signals and adjusts the relative phase if needed, and after said device receives a subsequent non-discernable indicator in response or receiving no indicator in response, transmitting a further single non-diversity mode signal.