Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1977-06-21
1979-05-01
Griffin, Robert L.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
325324, 333 18, H04B 306
Patent
active
041526490
ABSTRACT:
A method of and apparatus for determining during an initial training period the initial values of the coefficients of a transversal equalizer in a data transmission system in which the transmission channel creates frequency shift. The received periodic training sequence is modulated by a time-domain window signal whose Fourier transform exhibits a relatively flat central peak and has comparatively low values in the vicinity of those frequencies which are a multiple of the inverse of the period of the transmitted sequence, and the discrete Fourier transform W.sub.k of the modulated signal is computed. The values of the coefficients of the equalizer are obtained by computing the inverse discrete Fourier transform of the ratio F.sub.k =Z.sub.k /W.sub.k, where Z.sub.k is the discrete Fourier transform of the transmitted sequence.
REFERENCES:
patent: 3581279 (1971-05-01), Arbuckle
patent: 3582879 (1971-06-01), Sullivan
patent: 3614673 (1971-10-01), Kang
patent: 3747024 (1973-07-01), Choquet et al.
patent: 3864632 (1975-02-01), Chang
patent: 3947768 (1976-03-01), DesBlache et al.
patent: 4024342 (1977-05-01), Croisier et al.
patent: 4027257 (1977-05-01), Perrault
patent: 4027258 (1977-05-01), Perreault
patent: 4089061 (1978-05-01), Milewski
"Principles of Data Communications"-Lucky, Salz & Weldon, New York, 1968, Chapters 6, 7, 9.
"Cyclic-Equalization-A New Rapidly Converging Equalization Technique for Synchronous Data Communication"-Mueller and Spaulding B.S.T.J., Feb. 1975, pp. 369-406.
"A New Equalization Technique"-Tien-Lin Chang-Proceedings of the National Electronics Conference, 1973, Oct. 1973, pp. 335-338.
"Adaptive Maximum Likelihood Receiver for Carrier Modulated Data Transmission Systems"-Ungerboeck, IEEE Trans. on Comm., vol. CM-22, #5, May, 1974, pp. 624-636.
"Simultaneous Adaptive Estimation and Decision Algorithm for Carrier Modulated Data Transmission Systems"-Kobayashi, IEEE Trans. on Comm. Tech., vol. COM-19, #3, Jun., 1971, pp. 268-280.
"Signal Theory"-L. E. Franks, Englewood Cliffs, N.J.-Prentice-Hall, 1969, Section 4--4, pp. 79-97.
"What is the Fast Fourier Transform"-Cochran et al., IEEE Trans. on Audio and Electroacoustics, Jun., 1967, pp. 45-55.
"Digital Real Time Spectral Analysis"-Bergland and Hale, IEEE Trans on Electronic Computers, Apr. 1967, pp. 180-185.
"A Digital Processor to Generate Spectra in Real Time"-Shiveley, IEEE Trans. on Computers, vol. 3-17, #5, May 1968.
"Fast Fourier Transform Hardware Implementations"-Bergland, IEEE Trans. on Audio and Electroacoustics, vol. AU17, Jun. 1969, pp. 104-108.
Bookbinder Marc E.
Frisone John B.
Griffin Robert L.
International Business Machines - Corporation
LandOfFree
Channel equalization apparatus and method using the Fourier tran does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Channel equalization apparatus and method using the Fourier tran, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Channel equalization apparatus and method using the Fourier tran will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-633733