发明名称 |
DEMODULATION USING A TIME DOMAIN GUARD INTERVAL WITH AN OVERLAPPED TRANSFORM |
摘要 |
A system and method for demodulation of an RF signal on a transmission channel is provided. The RF signal is demodulated to baseband as an in-phase (I) data signal and a quadrature (Q) data signal. A first block of I data is captured and a first block of Q data is captured. A time domain guard interval is provided in the captured first blocks of I and Q data. A complex discrete Fourier transform is performed on the captured first I and Q data blocks. An inverse frequency response for the transmission channel is determined. The inverse frequency response is multiplied by the complex discrete Fourier transform of the guard-interval protected first I and Q data blocks to generate a frequency domain product signal. An inverse Fourier transform on the product of the multiplying step is performed to generate a first equalized time domain signal. In a preferred embodiment, the method also includes using an overlapped Fourier transform and discarding a first portion of each equalized time domain signal.
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申请公布号 |
CA2217259(A1) |
申请公布日期 |
1998.06.13 |
申请号 |
CA19972217259 |
申请日期 |
1997.10.02 |
申请人 |
CABLE TELEVISION LABORATORIES, INC.;NIPPON HOSO KYOKAI |
发明人 |
WILLIAMS, THOMAS H.;CHELEHMAL, MAJID;ITO, YASUHIRO |
分类号 |
H04B1/10;H04B7/005;H04J11/00;H04N5/21;(IPC1-7):H04L27/34;H04N5/44 |
主分类号 |
H04B1/10 |
代理机构 |
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主权项 |
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