发明名称 |
Demodulating apparatus for OFDM signals |
摘要 |
<p>A demodulating apparatus according to the present invention is one for demodulating a modulated signal obtained by modulating a plurality of carriers having different frequencies, and includes a data demodulating means for demodulating data by frequency-analyzing a time waveform of the modulated signal which is formed of a data period formed of one modulation time and a guard interval succeeding the data period and which includes in the data period a period having correlation with the guard interval and provided at a position away from the modulated signal by the one modulation time, a correlation means for detecting correlation between the guard interval of the modulated signal and the period in the data period having correlation with the guard interval and provided at a position away from the modulated signal by the one modulation time, and a synchronization signal generating means comprising the correlation means and for generating a synchronization signal based on a detection output from the correlation means. The correlation is detected in a predetermined period which is 1/2 as long as each of the guard interval and the period having correlation with the guard interval and in which correlation can substantially be detected. Therefore, it is possible to shorten a time for generating the synchronization signal. <IMAGE></p> |
申请公布号 |
EP0854620(A3) |
申请公布日期 |
2001.06.27 |
申请号 |
EP19980300333 |
申请日期 |
1998.01.19 |
申请人 |
SONY CORPORATION |
发明人 |
NAKAMURA, JIN;TSURUOKA, TATSUYA;NOMURA, KIYOSHI |
分类号 |
H04N5/455;H04J11/00;H04L27/22;H04L27/26;H04N19/423;H04N19/426;H04N19/60;H04N19/65;H04N19/70;H04N19/80;H04N19/85;H04N19/89;(IPC1-7):H04L27/26 |
主分类号 |
H04N5/455 |
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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