Patent ID: 8750814
Filing Date: 2014-06-10
Classification: H04B

Abstract:
1. A transmitter for a wireless communication system, comprising: a power amplifier configured to amplify a signal to be transmitted; an external amplifier; first and second transmission antennas, wherein the first transmission antenna has a first gain, and wherein the second transmission antenna has a second gain less than the first gain; a switch configured to select one between the first and second transmission antennas; a control unit configured to generate an antenna selection signal for controlling the switch; a transmission selector configured to directly output the signal amplified by the power amplifier to one between the first and second transmission antennas or output the signal amplified by the power amplifier to the external amplifier to further amplify the signal, based on a mode control signal; and a mode selector configured to compare a power level of a signal provided from a receiver with a predetermined power level to generate the mode control signal, wherein, when the power level of the signal provided from the receiver is less than or equal to the predetermined power level, the transmitter is configured to operate in a high-gain mode where: wherein, when the power level of the signal provided from the receiver is greater than the predetermined power level, the transmitter is configured to operate in a low-gain mode where: