| 摘要 |
PURPOSE: An apparatus and method for reducing the peak to average power ratio(PAPR) in an orthogonal frequency division multiplexing(OFDM) are provided to effectively utilize the limited channel source. CONSTITUTION: An apparatus and method for reducing the peak to average power ratio(PAPR) in an orthogonal frequency division multiplexing(OFDM) includes a cyclic redundancy code(CRC) generator(400), a mask generator(410), a plurality of adders(420,422,424,426), a plurality of channel coders(430,432,434,436), a plurality of modulators(440,442,444,446), a plurality of inverse fast Fourier transform(IFFT) units(450,452,454,456) and a PAPR calculation and comparison selector(460). The CRC generator(400) generates a CRC bits and adds it to the backside of the columns of the input information bits to output. The mask generator(410) generates an independent multiple mask sequences. The plurality of adders(420,422,424,426) adds the generated plurality of mask sequences to the input information bits. The plurality of channel coders(430,432,434,436) performs the channel coding and the plurality of modulators(440,442,444,446) modulates the columns of the coded bits in response to the channel coding. The plurality of IFFT units(450,452,454,456) performs the inverse fast Fourier transformation. And, the PAPR calculation and comparison selector(460) calculates the PAPR for each of the columns of the symbols and transforms the column of the symbol corresponding to the smallest value.
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