Newport Media, Inc.

Xiaoyu Fu

Jun Ma

Nabil R Yousef

Edward Youssoufian

Waleed M Younis

Ahmed Mohamed Eltawil

Janakan Sivasubramaniam

A method of estimating coarse frequency offset of received symbols based on a received frequency domain sample at a ksub-carrier of a 53Orthogonal Frequency Division Multiplexing (OFDM) data symbol in a jtime slot (TS) of a receiver in aChina Multimedia Mobile Broadcasting (CMMB) mobile televisioncommunicationnetwork includes dividing a received sample, Y, into two sets of noise only tones and data plus noise tones D, obtaining a received sample only if there is a coarse frequency offset mismatch between a transmitter and the receiver, dividing a summation of a power of the data plus noise tones by a summation of a power of the noise only tones to obtain &#x39b;, and estimating an integer coarse frequency offset estimate, &#x394;{circumflex over (f)}, of the received symbols when the &#x39b;is a maximum.

Coarse carrier frequency offset estimation for a receiver

A technique for providing stable tracking performance to an AGC loop circuit comprises amplifying a wideband radio frequency signal; detecting signals and blockers adjacent to the radio frequency signal; lowering a gain of the radio frequency signal; mixing a local oscillator signal with the radio frequency signal; shifting a frequency of the radio frequency signal from a radio frequency to an intermediate frequency; continuously varying a gain of the intermediate frequency signal; converting the intermediate frequency signal into a digital output signal; comparing the digital output signal with predefined thresholds comprising an upper threshold and a lower threshold; switching a post mixer amplifier (PMA) to a high gain state when an input of a variable gain amplifier (VGA) is greater than the upper threshold, and switching the PMA to a low gain state when an input of the VGA is lower than the lower threshold.

Technique for tuner automatic gain control circuit for mobile television applications

A method of estimating coarse frequency offset of received symbols based on a received frequency domain sample at a ksub-carrier of a 53Orthogonal Frequency Division Multiplexing (OFDM) data symbol in a jtime slot (TS) of a receiver in a China Multimedia Mobile Broadcasting (CMMB) mobile television network includes dividing a received sample, Y, into two sets of noise only tones and data plus noise tones D, obtaining a received sample only if there is a coarse frequency offset mismatch between a transmitter and the receiver, dividing a summation of a power of the data plus noise tones by a summation of a power of the noise only tones to obtain &#x39b;, and estimating an integer coarse frequency offset estimate, &#x394;{circumflex over (f)}, of the received symbols when the &#x39b;is a maximum.

Coarse carrier frequency offset estimation for CMMB mobile TV receiver

A method of processing an in-phase signal component and a quadrature signal component of a low intermediate frequency (LIF) signal includes estimating and correcting an amplitude imbalance between a digitized in-phase signal component and a digitized quadrature signal component at a first point in time, and estimating and correcting a phase imbalance between the digitized in-phase signal component and the digitized quadrature signal component at a second point in time in response to the correcting process. The digitized in-phase signal component corresponds to the in-phase signal component at the first point in time and the digitized quadrature signal component corresponds to the quadrature signal component at the first point in time. The second point in the time is subsequent to the first point in time.

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Irvine, CA, United States of America

Xiaoyu Fu