Maxlinear, Inc.

Broadcom Corporation

Hyungjin Kim

Curtis Ling

Xing Tan

Anand Anandakumar

Sridhar Ramesh

Robert Hulvey

Steven Deane Hall

Siukai Mak

Nicholas Michael Carbone

Methods and systems for precise temperature and timebase ppm error estimation using multiple timebases may comprise measuring a temperature corresponding to the plurality of timebases. The frequencies of the timebases may be compared to generate error functions for the timebases, and generating a more accurate reading of the temperature based, at least in part, on the measured temperature and the error functions for the timebases. The timebases may be calibrated utilizing the generated more accurate reading. The plurality of timebases may comprise different order temperature dependencies. The models of temperature dependencies of each of the plurality of timebases may be updated based, at least in part, on the fine reading of the temperature corresponding to the plurality of timebases. A global navigation satellite system (GNSS) clock signal may be utilized periodically to improve the accuracy of the calibration of the plurality of timebases.

Method and system for precise temperature and timebase PPM error estimation using multiple timebases

Methods and systems for precise temperature and timebase PPM error estimation using multiple timebases may comprise in an electronic device comprising a plurality of timebases and measuring a temperature corresponding to the timebases. Frequencies of the timebases at the measured temperature may be compared to determine differential error functions for the timebases. A fine reading of the temperature corresponding to the timebases may be generated based, at least in part, on the measured temperature and the determined differential error functions for the timebases. The timebases may be calibrated utilizing the generated fine reading of the temperature. The timebases may comprise different order temperature dependencies. Models of temperature dependencies of each of the timebases based may be updated, at least in part, on the fine reading of the temperature. A global navigation satellite system (GNSS) clock signal may be periodically utilized to improve the accuracy of the calibration of the timebases.

Precise temperature and timebase ppm error estimation using multiple timebases

To determine the level of frequency drift of a crystal oscillator as a result of a change in the its temperature, the temperature of the crystal oscillator is sensed and used together with previously stored data that includes a multitude of drift values of the frequency of the crystal oscillator each associated with a temperature of the crystal oscillator. Optionally, upon initialization of a GPS receiver in which the crystal oscillator is disposed, an initial temperature of the crystal oscillator is measured and a PLL is set to an initial frequency in association with the initial temperature. When acquisition fails in a region, the ppm region is changed. The temperature of the crystal oscillator is periodically measured and compared with the initial temperature, and the acquisition process is reset if there is a significant change in temperature. The GPS processor enters the tracking phase when acquisition is successful.

TCXO replacement for GPS

To compensate for roll-off while estimating a communication channel, an estimate of the channel is provided using a signal transmitted via the communication channel. The pilot tones positioned along the edges of the estimated channel are divided by the corresponding pilot tones of the received signal to generate a first number of ratios. An algorithm is thereafter applied to the first number of ratios to generate a second number of ratios associated with the non-pilot tones positioned along the edges of the estimated channel. Next, numbers that are inverse of the first and second number of ratios are applied to the pilot and non-pilot tones positioned along the edges of the estimated channel to compensate for the roll-offs in the estimated channel.

Edge equalizer

Disclosed are various embodiments for circuitry that generates a sync code for wireless transmission. The system generates a sync word according to an identifier of the transmitter, the sync word being unique under a cyclic shift of the sync word. The system inserts a plurality of instances of the sync word into a data stream. The system also transmits, via the transmitter, the data stream to a receiver, the receiver being operable to perform a sliding correlation operation on the sync word.

Generating codes for sync words to avoid cyclic collision

Methods and systems for precise temperature and timebase ppm error estimation using multiple timebases may comprise measuring a coarse reading of a temperature corresponding to the plurality of timebases. The frequencies of the timebases may be compared to generate a fine reading of the temperature based, at least in part, on the coarse reading and the comparison of the frequencies with respect to models of temperature dependencies for each of the timebases. The timebases may be calibrated utilizing the generated fine reading. The plurality of timebases may comprise different order temperature dependencies. The models of temperature dependencies of each of the plurality of timebases may be updated based, at least in part, on the fine reading of the temperature corresponding to the plurality of timebases. A global navigation satellite system (GNSS) clock signal may be utilized periodically to improve the accuracy of the calibration of the plurality of timebases.

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Irvine, CA, United States of America

Hyungjin Kim