| 摘要 |
A repeater for frequency band conversion is provided to solve the problem of call congestion and avoid frequency interference by converting the whole or part of a service frequency band into a surplus frequency band among many other service frequency bands, relaying the converted frequency band, and converting it into the original frequency band again. In a mobile communication network which consists of a base station, a link repeater(20), and a plurality of shadow area repeaters, the link repeater(20) comprises the first diplexer(202), a downlink LNA(Low Noise Amplifier)(203), a downlink converter(204), a downlink BPF(Band Pass Filter)(205) and a downlink HPA(High Power Filter)(206). The first diplexer(202) separates downlink signals of a service frequency band of the base station from uplink signals of the service frequency band. The downlink LNA(203) amplifies the downlink signals. The downlink converter(204) converts the service frequency band into another frequency band by combining the amplified downlink signals with local oscillation signals. The downlink BPS(205) passes only downlink signals of a desired converted frequency band among the converted signals. The downlink HPA(206) amplifies the converted downlink signals outputted through the downlink BPS(205).
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