TRANSMIT POWER REDUCTION FOR WIRELESS DEVICE WITH MULTIPLE TRANSMIT SIGNAL PATHS

摘要

PROBLEM TO BE SOLVED: To reduce transmit power and extend talk time.SOLUTION: A wireless device is equipped with multiple antennas 230a, 230b, which may be of different designs. Each antenna interacts with a wireless environment in a different manner and achieves different scattering effect. The wireless device has one transmit signal path for each antenna. Each transmit signal path generates an RF output signal for transmission from an associated antenna. The wireless device controls operation of one or more transmit signal paths to achieve a larger received signal level at a receiving base station. The wireless device may (1) autonomously adjust the transmit signal paths without relying on any feedback from the base station or (2) adjust the transmit signal paths on the basis of transmit power control (TPC) commands received from the base station. The wireless device selectively enables and disables each transmit signal path, varies the phase and/or gain of each transmit signal path, and so on.