Resources Contact Us Home
Parallel mode adaptive transversal equalizer for high-speed digital communications system

Image Number 6 for United States Patent #5005185.

In a parallel-mode adaptive transversal equalizer, P- and Q-channel data streams from A/D converters (1, 5) are respectively passed through the tapped-delay lines of trasversal filters (2, 6), on the one hand, and are one-symbol delayed, on the other, by delay circuits (3, 7, 66, 67) to produce (N-1) successively delayed P- and Q-channel data streams, which are respectively passed through the tapped delay lines of transversal filters (4; 63, 8; 64). In each trasversal filter, symbols appearing at successive taps of the tapped-delay line are sampled and held for a duration of N symbols to produce first and second groups of stored symbols, the stored symbols of the first group being multiplied by first tap weights and summed, producing N first equalized outputs for each channel. The stored symbols of the second are multiplied by second tap weights and summed, producing N second equalized outputs for each channel. The first equalized outputs of each channel are respectively combined by adders (10-14, 68, 69) with the second equalized outputs of the otehr channel and multiplexed (14, 15) into P- and Q-channel outputs. Correlations are detected by correlators (16-19, 70, 72) between data and error components of each of the P- and Q-channel outputs to control the first variable tap weights of associated tapped-delay lines, and correlations are detected by correlators (20-23, 71, 73) between data components of one of the P- and Q-channel outputs and error components of the other channel output to control the second variable tap weights of associated tapped-delay lines.

  Recently Added Patents
Sharing networks determined by sharing of items between individuals
Assisted hybrid mobile browser
Methods of establishing virtual circuits and of providing a virtual private network service through a shared network, and provider edge device for such network
Method and system for providing status of a machine
Image processing apparatus, image processing system, and image processing method
High-frequency power amplifier
Non-intrusive processor tracing
  Randomly Featured Patents
Method and apparatus for cleaning conduits
Panelized roofing system and method
Composite ski boot quarter
Methods for loss of capture and fusion avoidance in biventricular pacing therapy
Exercise weight system
Automated excision of undesirable material and production of starting material for restructured meat
Antenna array formed by a network of transceivers
Gripping device
Stuffed toy slug
Adaptable body conditioning apparatus