Broadcom Corporation

Avago Technologies General IP (singapore) Pte. Ltd.

Cable Television Laboratories, Inc.

Richard Stephen Prodan

Thomas J Kolze

Niki Roberta Pantelias

Bruce Joseph Currivan

Jonathan S Min

Ba-Zhong Shen

Tak Kwan Lee

Leo Montreuil

Joel I Danzig

Mark Edward Laubach

Ramon Alejandro Gomez

Thomas J Quigley

Lisa Voigt Denney

Kevin Lee Miller

Daniel Harvey Howard

David Michael Pullen

Hanli Zou

Roger Wayne Fish

Thomas Holtzman Williams

Victor Hou

Avi Kliger

Donald George McMullin

Avraham Kliger

John D Horton, Jr

Taruna Tjahjadi

Jeyhan Karaoguz

Xuemin Chen

Wael William Diab

Alexander Garland MacInnis

Kelly Brian Cameron

Pieter Vorenkamp

David Garrett

Hau Thien Tran

David Albert Lundgren

Yitshak Ohana

Fang Lu

John Daniel Horton

Brian Sprague

Peter Cangiane

Thomas J Quigley, Jr

Tom Quigley

Richard Nelson

Donald Mcmullin

A transmitter for use in a cable modem termination system includes a data processing module that generates a plurality of OFDM symbols from a data packet. A probe symbol generator generates a probe symbol, as one of a plurality of probe symbol types. The probe symbol is selectively inserted within the plurality of OFDM symbols, at a pre-defined probe symbol interval.

Communication system with proactive network maintenance and methods for use therewith

Embodiments provide solutions to reduce power utilization (either at individual cable modems or in the overall network) in future cable modem networks. Particularly, embodiments seek to reduce power utilization at individual cable modems and in the overall network, by allocating upstream frequency bands and/or transmission modulation schemes among cable modems while accounting for cable loss experienced by individual upstream cable modem transmissions. According to embodiments, frequency spectrum and modulation scheme allocation techniques are provided to optimize power utilization and enable lower upstream transmission power by cable modems while maintaining similar signal strength of received signals or lower signal strength with reduced SNR requirements using lower capacity modulation at the headend.

Frequency spectrum and modulation scheme allocation for high speed data networks

A device for codeword filling comprises at least one processor circuit. The at least one processor circuit is configured to receive portions of a data burst, encode the portions into blocks, and add the blocks to a buffer. The at least one processor circuit is configured to generate a first codeword from blocks of the buffer when a number of blocks in the buffer satisfies a threshold, remove the blocks from the buffer, and provide the first codeword for transmission. The at least one processor circuit is configured to generate a set of codewords from remaining blocks of the buffer when a marker indicating a data burst end is detected, the set of codewords being determined based at least on a number of the remaining blocks in the buffer when the marker is detected. The at least one processor circuit is configured to provide the set of codewords for transmission.

Upstream forward error correction codeword filling

A communication device (e.g., a cable modem (CM)) includes a digital to analog converter (DAC) and a power amplifier (PA) that generate a signal to be transmitting via a communication interface to another communication device (e.g., cable modem termination system (CMTS)). The CM includes diagnostic analyzer that samples the signal based on a fullband sample capture corresponding to a full bandwidth and/or a subset (e.g., narrowband) sample capture to generate a fullband and/or subset signal capture (e.g., of an upstream (US) communication channel between the CM and the CMTS). The diagnostic analyzer can be configured to generate sample captures of the signal based on any desired parameter(s), condition(s), and/or trigger(s). The CM then transmits the signal to the CMTS and the fullband and/or subset signal capture to the CMTS and/or a proactive network maintenance (PNM) communication device to determine at least one characteristic associated with performance of the US communication channel.

Noise localization within cable based communication systems

A communication device includes a communication interface and a processor configured to generate, transmit, receive, and process signals. The communication device generates orthogonal frequency division multiplexing (OFDM) frame(s) that include a two-dimensional (2D) start burst marker (BM), a data payload, and a 2D stop BM, and transmits the OFDM frame(s) to another communication device. Alternatively, the communication device receives OFDM frame(s) that include a 2D start BM and a 2D stop BM, and then identifies a data payload within those OFDM frame(s) based on the 2D start burst marker and a 2D stop BM. The 2D start and stop BMs are based on predetermined sequences having particular formats based on corresponding 2D sub-carrier and OFDM/A frame based structure. A receiver communication device then detects the 2D start BM and 2D stop BM within the received OFDM frame(s) based on knowledge of these predetermined sequences and particular formats.

Two-dimensional (2D) burst marker (BM) to identify data start and stop

A communication device (alternatively, device) includes a processor configured to support communications with other communication device(s) and to generate and process signals for such communications. In some examples, the device includes a communication interface and a processor, among other possible circuitries, components, elements, etc. to support communications with other communication device(s) and to generate and process signals for such communications. A device directs an analog to digital converter (ADC) to perform a sample capture of a communication channel and processes that sample capture to generate a detected power. The device performs an integrate-and-dump (I&D) operation on the detected power over at least one time period to generate an integrated power and then generates an integrated power histogram of the communication channel that includes the integrated power. This integrated power histogram characterizes noise generated by the device, noise entering the device, noise associated with the communication channel, etc.

Upstream (US) transient impairment localization and detection within communication systems

A communication device is configured to communicate coded information to other communication device(s). The communication device uses NCPs to indicate locations of codewords within signal(s) transmitted to the other communication device(s). The communication device is configured to encode NCP(s) using an FEC code to generate coded NCP(s) and also to encode the NCP(s) using a cyclic redundancy check (CRC) code to generate NCP CRC bits. The communication device is also configured to encode the NCP CRC bits using the FEC code to generate coded NCP CRC bits. The communication device is then configured to generate OFDM or OFDMA symbol(s) include the coded NCP(s) and the coded NCP CRC bits to indicate beginnings of codeword(s) within at least one of the OFDM symbol(s) and/or additional OFDM symbol(s). The communication device is also configured to transmit the OFDM or OFDMA symbols to another communication device via a communication interface of the communication device.

Combining CRC and FEC on a variable number of NCPs

A device implements orthogonal frequency division multiplexing (OFDM) techniques. In particular, the device includes a frequency interleaver and/or de-interleaver for OFDM modulation. The frequency interleaver provides random frequency interleaving for the symbols transmitted by OFDM modulation. The frequency de-interleaver provides random frequency de-interleaving for the symbols received by OFDM demodulation.

Frequency interleaving and de-interleaving for OFDM modulation

A communication device is configured to encode information bits using one or more forward error correction (FEC) codes and/or error correction codes (ECCs) to generate different codewords (e.g., codeword groups having different lengths, based on different code rates, etc.). The device generates a combined codeword using different sized codewords (e.g., long, medium, and short) by filling fills long codewords completely if possible, then filling medium codewords completely if possible with the remaining message bits (if any), and filling short codewords completely if possible plus another additional short codeword with the remaining message bits (if any). If the total number of short (or medium and short) codeword parity bits is greater than or equal to the number of medium (or long) codeword parity bits, then the device increments the number of medium (or long) codewords by one and setting the number of short (or medium and short) codewords to zero.

Multiple size and rate forward error correction (FEC) code combination with minimum shortening and maximum combined code rate

Multiple size and rate FEC code combination with minimum shortening and maximum combined code rate

A communication device is configured to encode and/or decode low density parity check (LDPC) coded signals. Such LDPC coded signals are characterized by LDPC matrices having a particular form. An LDPC matrix may be partitioned into a left hand side matrix and the right hand side matrix. The right hand side matrix can be lower triangular such that all of the sub-matrices therein are all-zero-valued sub-matrices (e.g., all of the elements within an all-zero-valued sub-matrix have the value of '0') except for those sub-matrices located on a main diagonal of the right hand side matrix and another diagonal that is adjacently located to the left of the main diagonal. A device may be configured to employ different LDPC codes having different LDPC matrices for different LDPC coded signals. The different LDPC matrices may be based generally on a common form (e.g., with a right hand side matrix as described above).

Low density parity check (LDPC) coding in communication systems

A communication device is configured to perform interleaving of a modulation symbol sequence to generate an OFDM symbol. Some modulation symbols within the modulation symbol sequence that are separated by an interleaver depth may be transmitted via adjacently located sub-carriers, while other modulation symbols within the modulation sequence that are separated by more than the interleaver depth may also be transmitted via adjacently located sub-carriers. First adjacently located sub-carriers transmit first and second modulation symbols that are separated by the interleaver depth within the modulation sequence while second adjacently located sub-carriers transmit third and fourth modulation symbol that are separated by more than the interleaver depth within the modulation sequence. A communication device may be configured to adapt and switch between different operational parameters used for interleaving and/or deinterleaving at different times based on any desired considerations.

Orthogonal frequency division multiplexing (OFDM) interleaving

A communication device includes a communication interface and a processor. In one example, the processor generates an orthogonal frequency division multiplexing (OFDM) symbol that includes information modulated within sub-carriers and then interleaves the sub-carriers of the OFDM symbol to generate an interleaved OFDM symbol. This interleaving of the sub-carriers operates to write the plurality of sub-carriers to rows of a two dimensional (2D) array and read the plurality of sub-carriers from columns of the 2D array. This interleaving also operates to read a column of the columns using a bit-reversed address of the column when the bit-reversed address is less than a number of the columns and using the address of the column when the bit-reversed address is greater than or equal to the number of the columns. The processor transmits, via the communication interface, the interleaved OFDM symbol to another communication device.

Frequency interleave within communication systems

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Niwot, CO, United States of America

Richard Stephen Prodan