| 摘要 |
PURPOSE: A device for receiving a multipath intermediate frequency in a W-CDMA system is provided to receive 10 sheets of channel cards, and to implement an IF downward conversion function with 6-sector or 3-sector diversity capacities in one circuit board, thereby reducing the number of circuit boards. CONSTITUTION: A reverse analog processor(100) receives an analog IF signal to perform an AGC function and a signal amplifying function. A DPRAM(Dual Port RAM)(120) stores data for performing the AGC function. A digital FIR filter(130) receives a baseband signal to perform a pulse shaping and interpolation function. An LVDS(Low Voltage Differential Signal) transmitter(140) converts multiplexed data at LVDS level, and transmits the data to a channel card. A control logic(150) generates a control signal, processes an alarm signal, generates clock dividing and synchronizing signals, and processes the signal. A clock distributor(160) distributes the clock dividing and synchronizing signals to a circuit board. A PLL(170) generates an analog signal, and supplies a local signal to the reverse analog processor(100). A clock receiver(180) processes a frame synchronous clock and a system clock. An HDLC interface(190) supplies a communication path with a semi-dual system. A processor unit(200) reports various alarming signals to an upper processor, drives the digital FIR filter(130), and initializes the PLL(170). A maintenance unit(210) receives a reset signal to initialize the processor unit(200) and the control logic(150). |
