| 摘要 |
PURPOSE: Expanding device is provided to connect the expanding devices with one base station in a daisy-chain system in order to transceive signals between the expanding devices and the base station in digital. CONSTITUTION: A data transceiving unit(210) having first/second receivers(211,213) and first/second transmitters(212,214) transceives digital stream. A forward demultiplexer(220) separates the digital stream by the sector according to timing of synchronizing clocks. A downward(or forward) signal selection unit(230) differently varies the strength of the separated sector signals. A downward digital signal processor(DSP)(240) restores output signals of the downward signal selection unit(230) to digital signals of an intermediate frequency(IF) signal band. A digital-to-analog(D/A) converter(250) converts the restored digital signals into analog IF signals. A radio frequency(RF) unit(260) converts the analog IF signals into high-frequency signals, the high-frequency signals into analog IF signals. An A/D converter(270) converts the IF signals from the RF unit(260) into digital signals. An upward(or reverse) DSP(280) converts the IF digital signals into digital data of a baseband. An upward demultiplexer(290) divides the digital stream signals from the second receiver(214) into sector signals, for outputting. An upward signal selection unit(300) converts received high frequency signals into digital signals and then combines the varied signals correspondingly to the sector signals. An upward multiplexer(310) sequentially selects sector signals from the upward signal selection unit(300) through time division, for conversion into a signal transmission stream. A controller(320) controls the strength of each signal.
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