Avago Technologies International Sales Pte. Limited

Broadcom Corporation

Avago Technologies General IP (Singapore) Pte. Ltd.

Anatoli Shindler

Avi Kliger

Yitshak Ohana

Avraham Kliger

Ba-Zhong Shen

Steven T Jaffe

Niki Roberta Pantelias

Tak Kwan Lee

Giuseppe Cusmai

Bazhong Shen

Eliran Hania

Hagay Garti

In some aspects, the disclosure is directed to methods and systems for interference mitigation and cancellation in full duplex amplifiers for cable modem or broadband communication systems. In many implementations, an interference canceller in the downstream path may be provided to equalize composite power on the FDX upstream subbands within a predetermined range of amplitude (e.g. X dB) from the desired downstream signal on the same subband, without affecting the downstream subbands.

North port interference mitigation in a full duplex (FDX) amplifier

A full duplex repeater includes an upstream echo canceller and noise reduction circuitry. The noise reduction circuitry is configured to receive an upstream signal from the upstream echo canceller, separate the upstream signal into a plurality of Fast Fourier Transform (FFT) blocks, multiply the upstream signal by a 100% raised cosine window, convert the upstream signal into frequency domain using FFT, clean predetermined portions of the upstream signal in the FFT blocks based on a predetermined threshold, convert the upstream signal from frequency domain to time domain using Inverse FFT; and recombine the FFT blocks.

Apparatus and method for noise reduction in a full duplex repeater

In some aspects, the disclosure is directed to methods and systems for improving signal to noise ratios of signals from multiple communication links. In some embodiments, a system includes a first frequency transformation circuit configured to transform a first signal in a time domain received from a first device into a corresponding second signal in a frequency domain. The system further includes a second frequency transformation circuit configured to transform a third signal in the time domain received from a second device into a corresponding fourth signal in the frequency domain. The system further includes a leg combining circuit configured to select, for a group of subcarriers, one of the first frequency transformation circuit and the second frequency transformation circuit, and cause, for the group of subcarriers, the selected frequency transformation circuit to output one of the second signal and the fourth signal, according to the selection.

Leg combining by FFT selection

A communication device (device) includes a communication interface and a processor, among other possible circuitries, components, elements, etc. to support communications with other device(s) and to generate and process signals for such communications. The device receives a ranging instruction signal, which includes an initial power and at least one power step, from another device. The device processes the ranging instruction generates a first ranging signal based on the initial power. The device then transmits the first ranging signal to the another device. When a ranging response to the first ranging signal is received from the another device, the device determines that the device is successfully ranged to the another device. Alternatively, when no ranging response is received, the device generates a second ranging signal based on the initial power and the at least one power step and transmit the second ranging signal to the another device.

Initial ranging transmission power

A method and system for generating a data frame in an upstream frame in an Ethernet Passive Optical Network protocol over Coax (EPoC) network is provided. The data frame includes a plurality of resource blocks, each of a particular type. The resource blocks are arranged in the data frame in accordance with pilot rules and a pilot pattern.

Upstream frame configuration for ethernet passive optical network protocol over coax (EPoC) networks

The present disclosure is directed to a system and method for detecting burst noise. The system and method are described in the exemplary context of a cable modem system and can be used in such a system to specifically detect upstream burst noise. Once detected, the system and method can adjust the upstream receiver that receives data corrupted by the upstream burst noise to reduce the potentially deleterious effects that the burst noise can have on, for example, the packet error rate and/or data rate of the upstream receiver.

Upstream burst noise detection

Impulse and/or burst noise signal to noise ratio (SNR) aware concatenated forward error correction (FEC). Adaptive processing is performed on a signal based on one or more effects which may deleteriously modify a signal. For example, based on a modification of a signal to noise ratio (SNR) associated with one or more impulse or burst noise events, which may be estimated, different respective processing may be performed selectively to differently affected bits associated with the signal. For example, two respective SNRs may be employed: a first SNR for one or more first bits, and a second SNR for one or more second bits. For example, as an impulse or burst noise event may affect different respective bits of a codeword differently, and adaptive processing may be made such that different respective bits of the codeword may be handled differently.

Growing community of inventors

Qiryat Ono, Israel

Anatoli Shindler