The Directv Group, Inc.

Broadcom Corporation

Avago Technologies General IP (singapore) Pte. Ltd.

Dtvg Licensing, Inc.

Guangcai Zhou

Ernest C Chen

Joseph Santoru

Tung-Sheng Lin

Shamik Maitra

Dennis Lai

Xuemin Chen

Rajesh Mamidwar

Weizheng W Wang

Lin-Nan Lee

Feng-Wen Sun

Wade Keith Wan

William C Lindsey

Adam Von Ancken

Judith M Wang

Victor Hou

Stephen Edward Krafft

Cecilia C Comeaux

Leon J Stanger

Gustave R Stroes

Patrick J Loner

Lakshmi Iyer, Jr

Donald J Breier

Steve Krafft

Yang-Yang Shi

Judith Wang

Lakshmi Iyer

Joseph A Santoru

Different data communication architectures deliver a wide variety of content, including audio and video content, to consumers. The architectures employ channel bonding to deliver more bandwidth than any single communication channel can carry. In some implementations, the communication architectures distribute data streams to bonded channels that are clocked independently. A system is provided for synchronizing the bonded channels.

Channel bonding synchronization

Different data communication architectures receive a wide variety of content, including audio and video content, for consumers. The architectures employ channel bonding to deliver more bandwidth than any single communication channel can carry. In some implementations, the communication architectures receive distributed video programming in the form of MPEG2 TS packets, flagged by marker packets. Channel bonding synchronization information may be present in packets defined above the data-link layer or received in fields within data-link layer frames.

Cross layer coordinated channel bonding

Methods and apparatuses identifying a co-channel interference signal in communications systems are disclosed. An exemplary method comprises generating an interference signal by subtracting a reconstructed desired signal from an at least partially demodulated composite signal, and generating synchronization statistics of interference signal using different scrambling codes. The interference signal is identified as the signal associated with the scrambling code that was used to generate an interference signal having a desired synchronization statistic.

Method and apparatus for identifying co-channel interference

A method and apparatus for adaptively controlling a transmission signal for transmission to at least one receiver in a terrestrial region is disclosed. The method selects a transmission signal mode having a modulation scheme, code scheme, and code rate from a plurality of transmission signal modes according to received information, generates a transmission signal according to the selected mode, and transmits the generated transmission signal to the receiver.

Adaptive coding and modulation for spot beam satellite broadcast

Systems and methods are provided, for estimating a channel based on previous channel estimations from the same source. Embodiments disclosed herein enable removal of the timing variation (from burst to burst) so that the channel can be more accurately estimated. Embodiments provide several systems and methods for averaging channel estimation information from each of the bursts. The systems and methods disclosed herein advantageously improve channel estimation accuracy and reduce modulation error.

Systems and methods for channel estimation of MoCA signals

Different data communication architectures deliver a wide variety of content, including audio and video content, to consumers. The architectures employ channel bonding to deliver more bandwidth than any single communication channel can carry. In some implementations, the communication architectures distribute video programming in the form of MPEG2 TS packets, flagged by marker packets, in a round-robin manner across the communication channels. Channel bonding synchronization information may be present in packets defined above the data-link layer or added to fields within data-link layer frames.

Methods and apparatuses for minimizing co-channel interference in communications systems are disclosed. A method in accordance with the present invention comprises shifting a characteristic of the first signal with respect to a like characteristic of the second signal to mitigate co-channel interference, and transmitting the first signal and the second signal over different channels of the communication system.

Shifted channel characteristics for mitigating co-channel interference

Methods and apparatuses for minimizing co-channel interference in communications systems are disclosed. A method in accordance with the present invention comprises scrambling a first frame using a first scrambling code, attaching a first header to the first frame to create the first signal, scrambling a second frame using a second scrambling code, attaching a second header to the second frame to create the second signal, and transmitting the first signal and the second signal over different channels of the communication system.

Methods and apparatuses for minimizing co-channel interference

Methods, apparatuses and systems for aligning an antenna reflector with satellites in a satellite configuration. A method in accordance with one or more embodiments of the present invention comprises aligning the reflector in tilt based on a geographic location of the reflector, passing the reflector through an azimuth arc wherein the azimuth arc intercepts at least a first point and a second point, the first point having a first signal strength received from the satellite configuration on the azimuth arc and the second point having a second signal strength less than the first signal strength, the second point located on the azimuth arc after the first point, passing the reflector through an elevation arc, the elevation arc intercepting at least the second point and a third point, the third point having a third signal strength received from the satellite configuration on the elevation arc, determining an alignment point having a maximum signal strength received from the satellite configuration based on a Gaussian antenna pattern of a reception of the satellite signal and the first signal strength, the second signal strength, and the third signal strength, and aligning the reflector with the alignment point.

Antenna peak strength finder

Methods and apparatuses for acquiring and demodulating a data stream transmitted in a communication system. A method in accordance with the present invention comprises finding a boundary of a physical layer frame (PLFrame) in the data stream, finding a first 26 bits of a Unique Word (UW) associated with the data stream, finding a scrambling code utilizing the UW, and using a decoding procedure to determine a modulation type and code rate used for desired signals within the data stream.

Blind identification of advanced modulation and coding modes

Methods and apparatuses for determining scrambling codes for minimizing co-channel interference in a communication system. A method in accordance with the present invention comprises defining at least one initial default sequence, generating a scrambling code, scrambling a signal using the generated scrambling code, comparing the scrambled signal with all other scrambled signals meeting a specified criterion, and saving the scrambling code word if the comparison determines that the signal scrambled with the scrambling code also meets the specified criterion. The scrambling codes can be compared with each other for cross-correlation purposes to determine whether they meet the specified criterion based on laboratory testing.

Methods and apparatuses for determining scrambling codes for signal transmission

Systems and methods for characterizing amplifiers. A system for characterizing an amplifier in accordance with the present invention comprises a Gaussian signal source for generating a signal in the frequency domain, a notch filter, coupled to the Gaussian Noise source, wherein the notch filter has a notch at a specified frequency and a frequency bandwidth, the frequency bandwidth encompassing the specified frequency, an Inverse Fast Fourier Transform device, coupled to an output of the notch filter, a normalization device, coupled to the Inverse Fast Fourier Transform device, an amplifier under test, coupled to the normalization device, for amplifying the signal generated by the Gaussian signal source, and a measurement device, coupled to an output of the amplifier, for measuring a power output of the amplifier in the frequency bandwidth and a noise output at the specified notch frequency, and for calculating the ratio between the power output and the noise output.

Growing community of inventors

Agoura Hills, CA, United States of America

Guangcai Zhou