MODULATOR, DEMODULATOR, TRANSMISSION DEVICE, AND RECEPTION DEVICE
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United States of America Patent
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Nov 13, 2014
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Nov 15, 2013
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Abstract
A modulator, demodulator, transmission device, and reception device for digital data that have excellent resistance to noise are provided. A modulator according to one aspect of this disclosure includes a modulation mapper (15) that performs 16APSK mapping at a radius ratio of 2.87 when the LDPC code rate is 93/120. A modulator according to another aspect of this disclosure includes a modulation mapper (15) that performs 32APSK mapping at a second inner circle to first inner circle radius ratio of 2.87 and an outer circle to first inner circle radius ratio of 5.33 when the LDPC code rate is 93/120. The modulator is included in a transmission device (1) according to this disclosure. A demodulator according to this disclosure includes a quadrature detector (21) that performs demodulation corresponding to the modulator. The demodulator is included in a reception device (2) according to this disclosure.
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