| 摘要 |
PURPOSE: A device of transmitting narrow bandwidth compensated for signal distortion is provided to simplify the configuration and reduce the cost by employing the varied-gain pre-process filter for distortion compensation. CONSTITUTION: In the device of transmitting narrow bandwidth compensated for signal distortion, a bottom bandwidth varied gain pre-process filter(30) adjusts the bottom bandwidth gains of the pair of digital input(I,Q). The first and second filters(31,32) filter the outputs of the pre-process filter(30). The first multiplier(33) multiplies the output of the first filter(31) by a carrier wave(cos(2πft)). The second multiplier(34) multiplies the output of the second filter(32) by a carrier wave(cos(πft)). An adder(35) adds the outputs of the first and second multipliers(33,34) and produces a frequency for transmission. A digital/analog converter(36) converts the output of the adder(35) into an analog transmission frequency(RF) corresponding to the clock frequency(fs).
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