REPEATER FORMING FREQUENCY SHIFTED CELL

摘要

A relay forming a cell which the frequency is shifted while solving an oscillation problem is provided to meet requirement of WCDMA(Wideband Code Division Multiple Access) frequency band determined in 3GPP(3rd generation partnership project). A first LNA(Low Noise Amplifier) amplifies the output of a duplexer with the low noise. An image erasing filter removes an image band without a first downlink frequency band from low noise signal. A down-conversion mixer down-converts the signal outputted from a first PLL(Phase Locked Loop)(300). A band pass channel filter filters a band pass channel. An automatic gain controller(330) adjusts the gain automatically by inputting the signal.