DELAY FILTER OF DIGITAL SIGNAL FOR INTERFERENCE CANCELLATION REPEATER

摘要

A digital signal delay filtering method of an oscillation canceling repeater is provided to set a fine time adjustment range with fractional multiplication sufficiently by using an FPGA(Field Programmable Gate Array), thereby solving restrictions on antenna installation fixation while coping with a destructive situation caused by distance transformation between antennas. Between an input port from a distributor(8) for distributing output signals of a wireless repeater to subtract an oscillation signal and an output port from an adder(14) for adding up signals to a receiving path of the wireless repeater, a signal delay filter(11) and a signal correlation operator(9) are individually connected to the distributor(8) through an A/D(Analog to Digital) converter(4). The correlation operator is connected to the signal delay filter(11) through a CPU(Central Processing Unit)(36). The signal delay filter(11) is connected to the adder(14) through a D/A(Digital to Analog) converter(3).