Future Wei Technologies, Inc.

Huawei Technologies Co., Limited

Fanglin Sun

Li Zhang

Jim Chen

Dao Pan

Guangsheng Wu

Yanbin Sun

Xiaofeng Zhang

Xiaoshu Si

Jianhua Liu

Bin Zhou

Ping Wang

Liping Wang

Tao Ouyang

Cao Shi

Jianping Tu

Zhong Pan

Xiaoyue He

Syed Rahman

Quanbo Zhao

Shicai Chen

Quan Bo Zhao

Guang Sheng Wu

Haixiang Liang

Embodiments of the present invention provide a signal processing method, including: dividing a frequency band used to send a downlink synchronization symbol into at least two parts of frequency bands that do not overlap, where the two parts of frequency bands are a first frequency band and a second frequency band; alternately allocating frequencies in the first frequency band to a probe tone and a flag tone; and allocating all frequencies in the second frequency band to a probe tone; and modulating a downlink pilot sequence to probe tones in the first frequency band and the second frequency band, and sending the downlink pilot sequence to a peer device. The embodiments of the present invention further provide a signal processing apparatus and a network system.

Signal processing method, apparatus, and system

Embodiments of the present disclosure provide an FEC coding and decoding method and device, and a system. A transmit end determines a forward error correction FEC coding type according to a length of to-be-coded data in burst data, and performs coding according to the determined FEC coding type. A receive end determines a forward error correction FEC decoding type according to a length of to-be-decoded data in burst data, and performs decoding according to the determined FEC decoding type. The FEC coding and decoding method provided in the embodiments of the present disclosure improves utilization of a communication resource is improved, and saves a communication resource.

Coding and decoding method and device, and system

Embodiments of the present invention provide a signal transmission method. The method includes: sequentially rotating phases of to-be-sent signals on a line setby different angles and in relative to phases of to-be-sent signals on a line set, and sequentially sending, to a user side, the to-be-sent signals whose phases are rotated. The method also includes receiving a rotation factor that is of a high-quality received signal on the line setand that is fed back by the user side, where the high-quality received signal includes a received signal with a high signal-to-noise ratio or high power. The method also includes using the rotation factor fed back by the user side as a fixed rotation factor, and rotating, according to the fixed rotation factor, a phase of a signal to be subsequently sent on the line set

Signal transmission method, apparatus, and signal transmission system

An optical line terminal (OLT) including a processor coupled to a transmitter. The processor is configured to send a first encrypted fiber to coax unit (FCU) message containing an optical domain multicast key to an FCU via an optical network. The optical domain multicast key is associated with encryption in an optical domain associated with the optical network. The processor is also configured to send a second encrypted FCU message containing an electrical domain multicast key to the FCU, and to send an encrypted coax network unit (CNU) message containing the electrical domain multicast key to a CNU via the FCU and a coaxial network. The electrical domain multicast key is associated with encryption in an electrical domain associated with the coaxial network. The first and second encrypted FCU messages and the encrypted CNU message may be operations, administration and maintenance (OAM) messages.

Extending data over cable service interface specification (DOCSIS) provisioning of ethernet passive optical network (EPON) (DPoE) to EPON over coax (EPoC) multicast key management

Embodiments of the present invention provide a forward error correction codeword synchronization method, device, and system. The method is: sending, by a central office device, synchronization information of an FEC codeword to a terminal device by using a management channel, where the information includes information about an agreed location of an FEC codeword, and the information about the agreed location of the first FEC codeword indicates a location that is of the first FEC codeword and is corresponding to data at an agreed location of an agreed time-frequency resource block; and receiving, by the terminal device, the synchronization information that is of the FEC codeword and is sent by the central office device, and adjusting a status parameter of an encoder or a decoder according to the information, so as to complete codeword synchronization. The embodiments of the present invention are used for FEC codeword synchronization.

Forward error correction codeword synchronization method, device, and system

Disclosed are a digital modulation method and apparatus. The digital modulation method includes: determining to-be-moved constellation points in a rectangular constellation diagram, where constellation points in the rectangular constellation diagram are distributed at corresponding coordinate points in a plane rectangular coordinate system, the to-be-moved constellation points include S columns of constellation points, in four quadrants of the plane rectangular coordinate system, and the rectangular constellation diagram is a constellation diagram generated by performing quadrature amplitude modulation (QAM) on a data bit stream; dividing to-be-moved constellation points in each of the four quadrants into two constellation point sets according to a bisector of an area between a horizontal coordinate axis and a straight line corresponding to a maximum absolute value of vertical coordinates in the rectangular constellation diagram; and horizontally moving and vertically moving each constellation point set in the four quadrants, to obtain a cross-shaped constellation diagram.

Digital modulation method and apparatus

Disclosed herein are mechanisms to support the management of multicast keys for a multicast group comprising one or more optical line terminals (OLTs), one or more fiber to coax units (FCUs), and a plurality of coax network units (CNUs). The disclosed embodiments may support the management of multicast keys over optical and coaxial networks. In some embodiments, an FCU may facilitate communication of operations, administration and maintenance (OAM) messages containing multicast keys from one or more OLTs to one or more CNUs (typically a plurality of CNUs). Some embodiments may employ one multicast key over both the optical network and coaxial network. Other embodiments may employ an optical domain multicast key over the optical network and an electrical domain multicast key over the coaxial network. Embodiments may comprise adding a first CNU to a multicast group as well as adding subsequent CNUs to the multicast group.

An apparatus comprising a receiver configured to couple to an Ethernet Passive Optical network over Coaxial (EPoC) network, and receive an upstream Orthogonal Frequency Division Multiplexing (OFDM) signal comprising a plurality of OFDM Resource Elements (REs), and a processor coupled to the receiver and configured to determine a presence of a burst marker sequence in the received signal, wherein the burst marker sequence comprises interlaced pilot symbols and null symbols, and wherein determining the presence of the burst marker sequence comprises computing a power ratio between a first set of the OFDM REs and a second set of the OFDM REs, and determining that the burst marker sequence is found when the computed power ratio exceeds a pre-determined threshold.

Burst marker scheme in a communication system

A Cable Modem Termination System (CMTS) comprising a receiver configured to receive a plurality of upstream transmission request messages from a plurality of coaxial units via an electro-optical network, wherein the upstream transmission request messages each request permission to transmit a specified amount of data, a processor coupled to the receiver and configured to allocate Orthogonal Frequency-Division Multiplexing (OFDM) minislots to each coaxial unit based on the amount of data requested in the associated upstream transmission request message, and a transmitter coupled to the processor and configured to transmit at least one Uplink Allocation Map (UL-MAP) message to indicate minislot allocations to the coaxial units.

Allocating orthogonal frequency-division multiple access (OFDMA) resources in data over cable services interface specification (DOCSIS) networks

A coaxial line terminal (CLT) comprising an optical port configured to couple to an optical line terminal (OLT) via an optical distribution network (ODN), an electrical port configured to couple to a coaxial network unit (CNU) via an electrical distribution network, and a processor coupled to the optical port and the electrical port, wherein the processor is configured to receive from the OLT a plurality of first frames addressed to the CNU, receive from the OLT a plurality of second frames not addressed to the CNU, forward the first frames to the CNU, and prohibit the second frames from being forwarded to the CNU.

Apparatus and method for reducing traffic on a unified optical and coaxial network

A method implemented in a Fiber Coaxial Unit (FCU) comprising receiving a plurality of Ethernet Passive Optical Network (EPON) report messages from a plurality of Coaxial Network Units (CNUs) across a coaxial network, receiving an EPON gate message comprising Time Quanta (TQ) information indicating an upstream transmission time grant for the FCU across the optical network, translating the TQ based upstream transmission time grants to OFDM resource block grants in a time domain and in a frequency domain across the coaxial network for each CNU based on the configurable constants, and transmitting an EPON over Coaxial (EPoC) gate message to each CNU, wherein each EPoC gate message comprises a CNU profile indicating the Orthogonal Frequency-Division Multiplexing (OFDM) resource block grants for the an associated CNU and a start time.

Allocating orthogonal frequency-division multiple access (OFDMA) resources in ethernet passive optical network(PON) over coaxial (EPOC)

A method comprising receiving a coaxial network unit (CNU) registration request from a CNU via a coaxial portion of a network, wherein the registration request is addressed to an optical line terminal (OLT), and forwarding the CNU registration request to the OLT via an optical portion of the network. Included is an OLT comprising a processor configured to receive a registration request including a logical node identifier (LNID) assigned to a coaxial line terminal (CLT) in a payload of the registration request, wherein the CLT intermediates between the OLT via an optical portion of a unified optical-coaxial network and a CNU via an electrical network portion of the unified optical-coaxial network, assign a logical link identifier (LLID) to the CNU, and send the LLID to the CNU via the CLT.

Apparatus and method for registering a coaxial network unit on an optical network

An apparatus for communication. A headend supports a plurality of customer premises equipment (CPEs) in a cable service network. An NCP carrier selector selects at least one orthogonal frequency division multiplex (OFDM) subcarrier taken from a radio frequency (RF) spectrum available for broadcasting signals over the cable service network using a plurality of profiles, wherein each selected OFDM subcarrier comprises a corresponding bit loading for each supported profile that meets or exceeds a minimum number of bits used for delivering next codeword pointer (NCP) messages that is acceptable for each of a plurality of profiles used in the plurality of CPEs for receiving signals over the cable service network. A profile generator generates an NCP profile identifying one or more selected OFDM subcarriers, wherein the NCP profile indicates which OFDM subcarriers within the RF spectrum are usable to carry NCP messages, and an associated bit loading for each selected subcarrier.

Method and apparatus for allocating OFDM subcarriers for next codeword pointers or other signaling messages

Disclosed herein are mechanisms to support the management of multicast keys for a multicast group comprising one or more optical line terminals (OLTs), one or more fiber to coax units (FCUs), and a plurality of coax network units (CNUs). The disclosed embodiments may support the management of multicast keys over optical and coaxial networks. In some embodiments, an FCU may facilitate communication of operations administration and maintenance (OAM) messages containing multicast keys from one or more OLTs to one or more CNUs (typically a plurality of CNUs). Some embodiments may employ one multicast key over both the optical network and coaxial network. Other embodiments may employ an optical domain multicast key over the optical network and an electrical domain multicast key over the coaxial network. Embodiments may comprise adding a first CNU to a multicast group as well as adding subsequent CNUs to the multicast group.

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Shenzhen, China

Fanglin Sun