发明名称 |
OFDM transmitter and receiver. |
摘要 |
<p>A signal transmitting apparatus using orthogonal frequency division multiplexing includes an inverse fast Fourier transform circuit for converting a digital information signal into a first multi-value QAM modulation signal. A guard interval setting circuit is operative for periodically generating a guard interval signal equal to a time segment of the first multi-value QAM modulation signal, and inserting the guard interval signal into the first multi-value QAM modulation signal to convert the first multi-value QAM modulation signal into a second multi-value QAM modulation signal. A clock signal generating circuit is operative for generating a first clock signal which drives the inverse fast Fourier transform circuit, and generating a second clock signal which drive the guard interval setting circuit. The inverse fast Fourier transform circuit is operative for generating a pilot signal which corresponds to a given-order carrier, and adding the pilot signal to the first multi-value QAM modulation signal. The pilot signal has a predetermined frequency and an angle modulation component which remains constant over a plurality of symbol periods. The pilot signal corresponding to a given integer times its wavelength is present in a guard interval occupied by the guard interval signal in the second multi-value QAM modulation signal. The pilot signal is continuously present over the guard interval and another interval. <IMAGE></p> |
申请公布号 |
EP0682426(A2) |
申请公布日期 |
1995.11.15 |
申请号 |
EP19950106939 |
申请日期 |
1995.05.08 |
申请人 |
VICTOR COMPANY OF JAPAN, LIMITED |
发明人 |
TAKAHASHI, NOBUAKI;TAKAHASHI, SUSUMU;SUGIYAMA, KENJI |
分类号 |
H04L27/26;(IPC1-7):H04L5/06 |
主分类号 |
H04L27/26 |
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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