Zenith Electronics Corporation

Thomson Licensing

Michael D Zoltowski

Mark J Fimoff

Serdar Ozen

Sreenivasa M Nerayanuru

Christopher J Pladdy

William J Hillery

Chandra Mohan

Zhiming Zhang

James Vincent Krogmeier

Gregory John Tomezak

An error between the rate fat which data are received and the rate fat which the data are sampled in is determined by processing a received signal with a nonlinear operator, performing a DFT on the processed signal to produce a plurality of DFT bins each characterized by a respective frequency, determining a dominant spectral component kfrom at least two of the DFT bins whose frequencies are substantially close to the frequency of the dominant spectral component k, and determining the data rate ffrom the dominant spectral component k.

Open loop cyclostationarity based timing recovery for accelerated timing acquisition in frequency selective channels

Constrained tap weights of a decision feedback equalizer are determined according to the channel impulse response of a channel and a constraint function. The constraint function is differentiable and is an approximation of a non-differentiable tap weight constraint function. The tap weight constraint function may have a constraint value M that is a function of a mean squared error of the estimated mean squared error at the output of the decision feedback equalizer.

Decision feedback equalizers with constrained feedback taps for reduced error propagation

An impulse response of a channel is estimated by correlating a received signal with a stored vector. The received signal contains a training sequence having a length L, the stored vector has a length L, L/n=L, and n is greater than two. The signal is received by a device. The vector is determined based on the training sequence and an ideal channel. The ideal channel is an idealized form of a channel through which the device receives the signal. A plurality of correlations may be performed where each correlation provides a substantially noise-free estimate of the impulse response of a different portion of the channel. The correlations are combined to provide an estimate of the impulse response of the channel.

Channel estimator using one or more correlation reference vectors to eliminate data related noise

A channel impulse response for a channel is determined by determining an initial channel impulse response estimate based upon a stored training sequence and a received signal, by thresholding the initial channel impulse response estimate, by estimating a noise variance for the channel based upon the stored training sequence, the thresholded initial channel impulse response estimate, and the received signal, by determining an inverse of a covariance matrix based on the estimated noise variance and the thresholded initial channel impulse response estimate, by updating the channel impulse response based on the inverse covariance matrix, the stored training sequence, and the received signal, and by thresholding the updated channel impulse response estimate.

Best linear unbiased channel estimation for frequency selective multipath channels with long delay spreads

Initial values of the tap weights for the taps of a linear equalizer are determined based on a channel impulse response of a channel so that the values corresponding to the weights of the equalizer taps achieve optimum initialization of the equalizer. These values are determined through use of a nested summation where the number of summations is dependent upon the number of multi-paths characterizing the channel.

Tap weight initializer for an adaptive equalizer

The tap weights of an equalizer are initialized in response to a received relatively short training sequence, and new tap weights for the equalizer are thereafter successively calculated in response to relatively long sequences of received symbols and corresponding sequences of decoded symbols. These new tap weights are successively applied to the equalizer.

Method and apparatus for the control of a decision feedback equalizer

Variable Aperture Coded (VAC) signals for VAC modulation are advantageously generated by a digital signal processor () that yields a VAC signal having a single narrow peak in the positive frequency region. A Discrete-Time Hilbert transformer () isolates only the positive spectral peaks, thus yielding a VAC signal that affords greater control over zero crossings.

DSP-based variable aperture code generation technique

A response of a channel may be estimated by correlating a received signal and a training sequence, by forming a matrix &#x393; based on a desired shape for the peaks of the correlation, by extracting a vector y from the received signal, and by estimating the channel response from a least-squares solution based on the matrix &#x393;, the vector y, and a matrix formed from the elements of the known training sequence.

Growing community of inventors

West Lafayette, IN, United States of America

Michael D Zoltowski