Thomson Licensing

Adam Robert Margetts

Louis Robert Litwin

Paul Gothard Knutson

Alton Keel

There is provided a hybrid rake/equalizer receiver for correlating a delay spread in a spread spectrum system. The hybrid rake/equalizer receiver includes a plurality of adaptive equalizers, each for filtering different regions of the delay spread that have an energy level above a pre-specified threshold to respectively provide equalized-descrambled chip sequences for correlation. Equalizer coefficients respectively corresponding to the plurality of adaptive equalizers are updated individually.

Hybrid rake/equalizer receiver for spread spectrum systems

An apparatus for synchronizing the reception of a spread-spectrum signal includes a synchronization apparatus having a code-matched filter, a running average unit coupled to the filter, a peak detector coupled to the running average unit, and a synchronizer coupled to the peak detector for providing an index of a peak. A corresponding method includes receiving a spread-spectrum signal having a period comprising a plurality of indexable samples, maintaining a mean array comprising a running mean value for each indexable sample over a variable number of periods, detecting a peak value of the array, calculating an average value of the array, computing a peak-to-average ratio in accordance with the detected peak value and the calculated average value, comparing the peak-to-average ratio against a time-varying threshold, and synchronizing the received signal when the peak-to-average ratio exceeds the current value of the threshold.

Synchronization strategy and architecture for spread-spectrum receivers

An apparatus and method for automatic gain control in spread-spectrum communications includes an automatic gain control apparatus for a spread-spectrum receiver, including a received signal strength indicator, an analog amplifier in signal communication with the received signal strength indicator, an analog-to-digital converter in signal communication with the analog amplifier, a digital automatic gain control loop in signal communication with the analog-to-digital converter, and a digital-to-analog converter in signal communication with the digital automatic gain control loop for providing a signal indicative of a digital gain to the analog amplifier; where the corresponding method for automatic gain control in spread-spectrum communications includes receiving an analog signal, measuring the strength of the received analog signal, deriving a first analog gain in correspondence with the measured strength, applying the derived first analog gain to an analog amplifier, deriving a second analog gain from a pilot channel signal within an automatic gain control loop, deriving a digital gain from the pilot channel signal within the automatic gain control loop, and applying an automatic gain control signal indicative of the second analog gain and the digital gain to the analog amplifier.

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Plainsboro, NJ, United States of America

Adam Robert Margetts