Jun Ma

7599441, Oct 6, 2009

Jun 20, 2006

11/471187

Jun Ma - Irvine CA, US
Nabil Yousef - Foothill Ranch CA, US

Newport Media, Inc. - Lake Forest CA

H04L 5/12
H04L 23/02
H04L 27/06

375262, 375261, 375341

A DVB-H bit-interleave coded modulation/demodulation system and method includes a convolutional encoder; an interleaver operatively connected to the convolutional encoder; a quadrature amplitude modulation (QAM) mapper operatively connected to the interleaver; a channel component operatively connected to the QAM mapper; a QAM demapper operatively connected to the channel component; a de-interleaver operatively connected to the QAM demapper; and a Viterbi decoder operatively connected to the de-interleaver. Preferably, the interleaver comprises a bit-wise interleaver and a symbol-wise interleaver operatively connected to the bit-wise interleaver. Preferably, the de-interleaver comprises a bit-wise de-interleaver; and a symbol-wise de-interleaver operatively connected to the bit-wise de-interleaver. The de-interleaver may be adapted to decode a soft decision metric for any of a QPSK, 16QAM, and 64QAM modulation. The de-interleaver may be adapted to decode a soft decision metric computation comprising a log-likelihood ratio soft decision metric of a binary bit stream of a signal.

7778316, Aug 17, 2010

Nov 14, 2006

11/559540

Jun Ma - Irvine CA, US

Newport Media, Inc. - Lake Forest CA

H04B 17/00

375224, 375227, 375230, 375232, 375229

A system and method of detecting the location and magnitude of multi-path echoes in a channel impulse response by going through the channel impulse magnitude response only once and detecting all the multi-path echoes, both location and magnitude, according to certain threshold criteria. The impulse magnitude response samples are processed on-the-fly (on demand) and do not require the storage of the entire channel impulse magnitude response which makes it ideal for ASIC implementation.

7912142, Mar 22, 2011

Apr 4, 2008

12/062650

Jun Ma - Irvine CA, US
Nabil Yousef - Foothill Ranch CA, US
Li Liu - Aliso Viejo CA, US

Newport Media, Inc. - Lake Forest CA

H04B 15/00

375285, 375267, 375346, 375347

An apparatus, method, and system for reducing a C/N in an OFDM receiver using diversity combining techniques in the presence of ICI, wherein the apparatus comprises an encoded data estimator adapted to estimate data received in the OFDM receiver; a pair of ICI estimators operatively connected to the encoded data estimator and adapted to calculate an inter-carrier-interference term of the data; and a pair of diversity combining equalizers adapted to compensate multi-path interference of the data, wherein a first one of the diversity combining equalizers is operatively connected to the encoded data estimator, and a second one of the diversity combining equalizers is operatively connected to the pair of ICI estimators. The diversity combining equalizer may comprise a MRC diversity combining equalizer. Preferably, the encoded data estimator, the pair of ICI estimators, and the pair of diversity combining equalizers are implemented on a DVB-T/H diversity SoC.

7941117, May 10, 2011

Feb 29, 2008

12/039806

Jun Ma - Irvine CA, US
Ahmed Eltawil - Irvine CA, US
Xiaoyu Fu - Irvine CA, US

Newport Media, Inc. - Lake Forest CA

H04B 1/10

455285, 455296, 455302

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.

7944983, May 17, 2011

Feb 29, 2008

12/039799

Xiaoyu Fu - Irvine CA, US
Jun Ma - Irvine CA, US
Nabil Yousef - Foothill Ranch CA, US

Newport Media, Inc. - Lake Forest CA

H04K 1/10

375260, 375259, 375343, 375149, 375341, 370206, 370208, 370210

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 Λ, and estimating an integer coarse frequency offset estimate, Δ{circumflex over (f)}, of the received symbols when the Λis a maximum.

7944999, May 17, 2011

Apr 4, 2008

12/062774

Jun Ma - Irvine CA, US
Nabil Yousef - Foothill Ranch CA, US

Newport Media, Inc. - Lake Forest CA

H04L 27/00

375326, 375344, 375355

A technique for estimating a carrier frequency offset and a timing offset in a MediaFLO™ (Forward Link Only) system, wherein the method comprises receiving Orthogonal Frequency Division Multiplexing (OFDM) symbols; interpolating pilots on odd or even symbols of the received OFDM symbols; determining a phase difference between two successive symbols using the interpolated pilots; obtaining an estimate of the carrier frequency offset and the timing offset from the determined phase difference between two successive symbols; and correcting a sampling frequency in accordance with the estimated carrier frequency offset and timing offset.

8169546, May 1, 2012

Feb 19, 2008

12/033323

Xiaoyu Fu - Irvine CA, US
Jun Ma - Irvine CA, US
Waleed M. Younis - Foothill Ranch CA, US
Nabil Yousef - Foothill Ranch CA, US
Janakan Sivasubramaniam - Irvine CA, US
Edward Youssoufian - Irvine CA, US

Newport Media, Inc. - Lake Forest CA

H04N 5/52
H04N 3/27
H04N 5/00
H04N 5/44
H04B 1/40
H04B 17/02
H04B 1/06
H04B 7/00
H04B 1/26
H04B 1/00
H04L 27/06
H04L 17/08

348678, 348554, 348607, 348618, 348725, 455 20, 455 85, 455138, 4552341, 4552501, 455323, 375150, 375344, 375345

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.

8416799, Apr 9, 2013

May 5, 2011

13/101998

Ryosuke Fujiwara - San Jose CA, US
Jun Ma - San Jose CA, US

Hitachi, Ltd. - Tokyo

H04L 12/42

370449, 370445

Systems and methods directed towards improving reliability for wireless networks. Selective polling techniques are utilized to selectively poll stations within a wireless network in order to ensure that a station failing to properly transmit data is given an opportunity to rectify the transmission failure. The selective polling techniques can be applied to any polling-based system, thus maintaining backwards compatibility with legacy systems.