发明名称 |
COMMUNICATION SYSTEM, TRANSMISSION APPARATUS, RECEPTION APPARATUS, AND DIGITAL TRANSMISSION METHOD |
摘要 |
A communication system using hierarchical modulation and capable of flexibly adjusting line quality includes a transmission apparatus that hierarchically modulates and transmits signal sequences, a reception apparatus that hierarchically demodulates a received signal, and a hierarchization-parameter setting unit that sets hierarchization parameters. The transmission apparatus includes a hierarchical modulation unit that superimposes signals from layers while maintaining gray codes. The reception apparatus includes a hierarchical demodulation unit that demodulates and separates hierarchically modulated signals and detects signals from layers. The hierarchization-parameter setting unit sets a hierarchization ratio which is a signal power ratio used for superimposing a higher layer and a lower layer, a mapping pattern capable of selecting two patterns, and a mapping pattern mixing ratio indicating a ratio with which two mapping patterns are mixed. |
申请公布号 |
US2015156050(A1) |
申请公布日期 |
2015.06.04 |
申请号 |
US201314406035 |
申请日期 |
2013.07.29 |
申请人 |
Mitsubishi Electric Corporation |
发明人 |
Nishimoto Hiroshi;Ohashi Akinori |
分类号 |
H04L27/34 |
主分类号 |
H04L27/34 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
Tokyo JP |