| 摘要 |
PURPOSE: A phase rotation modulation & demodulation apparatus and a method thereof are provided to prevent degradation of reception performance, and to obtain high electricity of a transmitter. CONSTITUTION: A transmitting apparatus comprises: a bit grouping (100), a phase rotation symbol mapper (110), an up-sampler (120), a transmission filter (130), a digital analog converter (140), and an orthogonal modulator (150). The bit grouping performs a k bit grouping to map an input bit string into a symbol having M level. The phase rotation symbol mapper is inputted with the k bit, and produces a complex symbol having a phase rotational characteristic. The up-sampler performs an up-sampling of the phase rotation encoded symbol. The transmission filter filters the up-sampled signal. The digital analog converter generates a radio transmission signal by converting a digital signal to an analog signal and passing through the orthogonal modulator. [Reference numerals] (100) Bit grouping; (110) Phase rotation symbol mapper; (120) Up-sampler; (130) Transmission filter; (140) Digital analog converter; (150) Orthogonal modulator
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