发明名称 |
Modulation and demodulation method, modulation apparatus and demodulation apparatus |
摘要 |
The present invention relates to a modulation and demodulation method of minimizing an error rate and applying it to a differential operation modulo 4. A modulation apparatus includes a Gray coding circuit 101 to which data of (2n+1) bits are inputted (where “n” is an integer more than 1) and which encodes 2 bits of an input signal of (2n+1) bits to a Gray code as a signal for allowing four quadrants to be identified, an encoding circuit 102 that encodes 3 bits of the input signal of (2n+1) bits as a signal indicating any one of eight subgroups provided in each of the four quadrants so that an average Hamming distance between adjacent subgroups within its quadrant becomes a minimum, and a mapping circuit 104 that maps binary data encoded by the Gray coding circuit 101 and the encoding circuit 102 on the four quadrants. |
申请公布号 |
US8229022(B2) |
申请公布日期 |
2012.07.24 |
申请号 |
US20060090126 |
申请日期 |
2006.10.20 |
申请人 |
NODA SEIICHI;SASAKI EISAKU;NEC CORPORATION |
发明人 |
NODA SEIICHI;SASAKI EISAKU |
分类号 |
H04L25/49 |
主分类号 |
H04L25/49 |
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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