Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1997-08-12
1999-07-13
Gensler, Paul
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
375233, H04B 304
Patent
active
059232269
ABSTRACT:
The object of the present invention is to provide an automatic equalizer which can automatically equalize distortion including a precursor component with a small amount of calculation and a small circuit scale. The automatic equalizer includes a subtractor for calculating differences between a received signal and N estimated received signals and outputting N estimated error signals, a decision unit for outputting part of a transmission signal sequence corresponding to one of the N estimated error signals which exhibits the lowest absolute value as a detected signal as the output of the automatic equalizer, a tap coefficient generation circuit for receiving the received signal as an input thereto to produce an impulse response and outputting the impulse response as a first tap coefficient group corresponding to a postcursor component of the impulse response and a second tap coefficient group corresponding to a precursor signal of the impulse response, a transversal filter for receiving the detected signal and the first tap coefficient group as inputs thereto and outputting a postcursor estimation signal, and an estimated received signal generator for receiving the postcursor estimation signal and the second tap coefficient group as inputs thereto and outputting the N estimated received signals corresponding to possible N transmission signal sequences.
REFERENCES:
patent: 4789994 (1988-12-01), Randall et al.
patent: 5068873 (1991-11-01), Murakami
H. Suzuki, et al., "Dynamic Performance Analysis on RLS Adaptive Equalizers for Mobile Radio Transmission", Journal of Papers of the Electronic Information and Communication Society of Japan, B-II, vol. J76-B-II, No. 4, pp. 189-201.
Kakura Yoshikazu
Osawa Tomoki
Gensler Paul
NEC Corporation
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