Abstract: 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.

Abstract: 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.

Abstract: 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

Abstract: An apparatus and method for synchronizing the reception of a spread-spectrum signal include a synchronization apparatus having a code-matched filter, a running average unit in signal communication with the code-matched filter, a peak detector in signal communication with the running average unit, and a synchronizer in signal communication with the peak detector for providing an index of a peak; where the 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 maintained mean array, calculating an average value of the maintained mean 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 th

Abstract: 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