Universal Data Systems, Inc.

Jerome J Viviano

Teri C Raynor

Apparatus for identifying (78) a signal point of a receive constellation corresponding to an extracted symbol of a train of symbols of a modulated communication signal and for adjusting (88) the signal point to a new position of the receive constellation based on the position of the extracted symbol in relation to the current position of the signal point. The new position of the identified signal point becomes part of the receive constellation for processing at least one subsequently extracted symbol of the communication signal. In addition, apparatus is provided for adjusting (120) equalizing coefficients of an equalizer (76) based on factors including an equalized extracted symbol, the identified signal point, corresponding extracted symbols of the equalizer, and an adaptive gain factor.

Apparatus for adjusting signal points, equalizer coefficients and the

Received data information is converted into digital data by sampling the data information and making a determination of the digital state for each bit. It is important that the clock which controls the time at which each data decision is made occurs at an optimal time, i.e. at the maximum signal to noise ratio of the received data information. This invention provides an improved clock control apparatus in which the clock timing is updated only upon receipt of one of a predetermined set of data sequences to enhance optimal timing.

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Madison, AL, United States of America

Jerome J Viviano