发明名称 |
DIGITAL COMMUNICATION METHOD AND DIGITAL COMMUNICATION DEVICE |
摘要 |
<p>A digital communication device includes: a modulator having encoding means for converting two-dimensional digital information signal into a three-dimensional signal and phase modulation means for modifying the carrier phase in according to the three-dimensional signal; and a demodulator having phase demodulation means for detecting information on the three-dimensional signal from the received phase-modulated wave and demodulation means for deciding the two-dimensional digital information from the information on the three-dimensional signal. The digital communication device has a bit error ratio and an occupied radio band width equivalent to a digital communication device using the conventional QPSK or pi/4 shift QPSK and the error correction method and greatly improves the amplitude fluctuation. Moreover, the digital communication device can transmit a signal with a narrower occupied frequency band width while maintaining the same constant envelope characteristic as the GMSK using the conventional error correction code.</p> |
申请公布号 |
WO2004032335(A1) |
申请公布日期 |
2004.04.15 |
申请号 |
WO2003JP12675 |
申请日期 |
2003.10.02 |
申请人 |
YOKOHAMA TLO COMPANY, LTD.;NAKAMURA, MAKOTO |
发明人 |
NAKAMURA, MAKOTO |
分类号 |
H03M7/06;H03M13/21;H03M13/23;H03M13/25;H04L1/00;H04L1/24;H04L25/49;H04L27/20;H04L27/233;H04L27/28;(IPC1-7):H03M13/25;H04L27/18 |
主分类号 |
H03M7/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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