Patent ID: 6714522
Filing Date: 2004-03-30
Classification: H04W

Abstract:
A wireless local loop (WLL) system using a code division multiple access (CDMA) method, comprising:a voice interface unit (VIU) that provides an interface with a voice purpose terminal; a data port unit (DPU) that provides an interface with a data purpose terminal; a data transmission buffer that temporarily stores therein data from the DPU; a CDMA modulator that respectively modulates a digital signal from the VIU and the data transmission buffer to a code signal for a data purpose channel and a voice purpose channel, which are separately assigned; a radio frequency (RF) transmitter that up-converts the modulated code signal, amplifies the up-converted signal to a predetermined transmission power, and transmits the amplified signal through a transmission antenna into free space; and a microprocessor that controls the transmission power of the RF transmitter in accordance with a state of the data transmission buffer, wherein the microprocessor interrupts the power transmission of the RF transmitter when there is no data for transmission in the data transmission buffer.