发明名称 |
Orthogonal frequency division multiplex demodulation |
摘要 |
An orthogonal frequency division multiplex (OFDM) demodulation apparatus which accurately reproduces a clock and accurately generates a time window for discrete Fourier transformation (DFT) for stable demodulation of an OFDM modulated signal, wherein a clock reproduction circuit of the OFDM demodulation apparatus includes a Costas computation circuit and processes a signal corresponding to the specific carrier wave signal of a predetermined single wave for each symbol out of the I and Q channel signals obtained by subjecting the OFDM modulated signal to DFT to generate a control voltage using the Costas computation circuit and low pass filters and operates a voltage control oscillator to reproduce a clock signal. The clock signal is divided to produce the time window signals used in the DFT circuit.
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申请公布号 |
US5506836(A) |
申请公布日期 |
1996.04.09 |
申请号 |
US19940281169 |
申请日期 |
1994.07.27 |
申请人 |
SONY CORPORATION |
发明人 |
IKEDA, YASUNARI;HYAKUDAI, TOSHIHISA;ITO, OSAMU;MIYATO, YOSHIKAZU |
分类号 |
H04J11/00;H04L27/22;H04L27/227;H04L27/26;H04L27/38;(IPC1-7):H04J11/00 |
主分类号 |
H04J11/00 |
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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