Patent application number | Description | Published |
20120300680 | TRANSMISSION SCHEMES FOR RELAY - Techniques for processing and forwarding transmissions by a relay are disclosed. In one aspect, an orthogonal distributed space-time frequency code (DSTFC) scheme that supports full-duplex relay operation and mitigates self-interference is disclosed. With the orthogonal DSTFC scheme, a source node transmits a same modulation symbol on two subcarriers in one symbol period. The relay obtains two received symbols from the two subcarriers and generates two output symbols based on these received symbols such that the output symbols and the modulation symbol are orthogonal at the relay and a destination node. In another aspect, a distributed Alamouti scheme is disclosed in which the source node transmits two modulation symbols on two subcarriers in each of two consecutive symbol periods. The relay obtains two received symbols from the two subcarriers in one symbol period and generates two output symbols based on the received symbols and in accordance with an Alamouti code. | 11-29-2012 |
20120314655 | DATA TRANSMISSION AND RECEPTION WITH HARQ AND NETWORK CODING - Techniques for transmitting and receiving data with hybrid automatic retransmission (HARQ) and network coding via block operation are disclosed. In one design, a transmitter transmits a first block of packets to multiple receivers and receives ACK/NAK feedback for the first block of packets from the receivers. The transmitter identifies candidate packets for network coding based on the ACK/NAK feedback. A pool of candidate packets changes over time as more ACK/NAK feedback for transmitted packets is received from the receivers. The transmitter generates at least one network-coded packet based on the candidate packets. Each network-coded packet may be generated by channel coding each of at least two packets and combining the at least two packets after channel coding. The transmitter transmits another block of packets to the receivers. This block includes the at least one network-coded packet and may also include pending packets and/or new packets. | 12-13-2012 |
20130058276 | METHOD AND APPARATUS FOR SIGNALING SIDE INFORMATION FOR NETWORK CODING IN A WIRELESS COMMUNICATION NETWORK - Techniques for efficiently sending side information to support network coding in a wireless network are disclosed. A node may send a subset of packet identifiers (IDs) for received packets in order to reduce signaling overhead in support of network coding operations. In one design, a node obtains a plurality of received packets, with each received packet being generated based on at least one base packet in a set of base packets. The node determines a reduced set of base packet IDs for the received packets. The reduced set may be a subset of an overall set including base packet IDs of all base packets for each of the received packets. The node sends information conveying the reduced set of base packet IDs, receives a network-coded packet generated based on the sent information, and recovers a base packet intended for the node based on the network-coded packet. | 03-07-2013 |
20130148563 | APPARATUS AND METHODS FOR MANAGEMENT, CONFIGURATION AND CONTROL SIGNALING OF NETWORK CODED HARQ IN MOBILE COMMUNICATION SYSTEMS - Techniques for the management, configuration, and control of network coded communications in a wireless network are disclosed herein. In one approach, there is provided an example method operable by an evolved Node B (eNB) or the like. The method may involve grouping a plurality of user equipments (UEs) into a network coding group. The method may involve associating the plurality of UEs in the network coding group with a network coding group identifier. The method may involve sending a data transmission for select UEs in the network coding group using the network coding group identifier. The data transmission may include additional downlink control information related to one or more of the UEs in the network coding group. | 06-13-2013 |
20130232537 | PACKET FILTERING AT A MEDIA CONVERTER IN A NETWORK WITH OPTICAL AND COAXIAL COMPONENTS - A media converter is coupled to an optical link terminal and a plurality of coax network units in a cable plant. The media converter receives packets from the optical link terminal via an optical link. The packets include first packets addressed to coax network units on the cable plant and second packets addressed to network units outside of the cable plant. The media converter forwards the first packets to the coax network units on the cable plant via one or more coax links, such that the first packets are forwarded to each coax network unit on the cable plant, and discards the second packets. | 09-05-2013 |
20130236178 | MULTI-POINT CONTROL PROTOCOL PROXY ARCHITECTURE IN A NETWORK WITH OPTICAL AND COAXIAL DOMAINS - A method of registering a coax network unit (CNU) in a network is performed at an optical-coax unit (OCU). In the method, a first discovery message is broadcasted to a plurality of CNUs. In response, a first registration request is received from a first CNU of the plurality of CNUs. In response to the first registration request, a proxy entity corresponding to the first CNU is implemented in the OCU. A second discovery message is received from an optical line terminal (OLT). In response to the second discovery message, a second registration request is transmitted to the OLT requesting registration of the proxy entity with the OLT. | 09-12-2013 |
20130239165 | METHODS AND SYSTEMS FOR ALLOCATING RESOURCES IN A NETWORK WITH OPTICAL AND COAXIAL COMPONENTS - A media converter is to be coupled to an optical line terminal via an optical link and to a plurality of coax network units via coax links in a cable plant. The media converter includes an optical physical-layer device to receive and transmit optical signals via the optical link and a coax physical-layer device to receive and transmit electrical signals via the coax links. The media converter also includes an implementation of an optical-coax convergence layer to schedule transmissions of electrical signals from the plurality of coax network units by allocating coax resources among the plurality of coax network units in accordance with resource allocation for the optical link. | 09-12-2013 |
20130259153 | PAIRED OFDM PILOT SYMBOLS - Successive pairs of OFDM symbols are transmitted by an OFDM transmitter and received by an OFDM receiver. The successive pairs include a first pair of OFDM symbols. First and second OFDM symbols of the first pair both include pilot symbols on two subcarriers that are symmetric about a center carrier frequency. The two subcarriers are the same for the first and second OFDM symbols. The pilot symbols on the two subcarriers for the first and second OFDM symbols compose an orthogonal matrix. The OFDM receiver estimates frequency responses at frequencies including the frequencies of the two subcarriers and compensates for signal impairment based at least in part on the estimated frequency responses. | 10-03-2013 |
20130259173 | RECEIVER-SIDE ESTIMATION OF AND COMPENSATION FOR SIGNAL IMPAIRMENTS - A receiver receives a repeating or periodic signal and, based on the signal, estimates a carrier frequency offset for the receiver. Based on the signal and the estimated carrier offset, an I/O mismatch for the receiver is estimated and compensation for the estimated I/O mismatch is performed. After compensating for the estimated receiver I/O mismatch, the carrier frequency offset is re-estimated. | 10-03-2013 |
20130343753 | METHODS AND SYSTEMS FOR IMPLEMENTING TIME-DIVISION DUPLEXING IN THE PHYSICAL LAYER - A physical-layer device includes a first sublayer to receive a first continuous bitstream from a media-independent interface and to provide a second continuous bitstream to the media-independent interface. The physical-layer device also includes a second sublayer to transmit first signals corresponding to the first continuous bitstream onto an external link during a first plurality of time windows and to receive second signals corresponding to the second continuous bitstream from the external link during a second plurality of time windows. The second plurality of time windows is distinct from the first plurality of time windows. | 12-26-2013 |
20130343759 | REPEATER FIBER-COAX UNITS - An optical-coax unit (OCU) includes an optical PHY to receive and transmit optical signals and a coax PHY to receive and transmit coax signals. The OCU also includes a media-independent interface to provide a first continuous bitstream from the optical PHY to the coax PHY and a second continuous bitstream from the coax PHY to the optical PHY. The first continuous bitstream corresponds to received optical signals and transmitted coax signals, and the second continuous bitstream corresponds to received coax signals and transmitted optical signals. | 12-26-2013 |
20140003308 | PHYSICAL-LAYER DEVICE CONFIGURABLE FOR TIME-DIVISION DUPLEXING AND FREQUENCY-DIVISION DUPLEXING | 01-02-2014 |
20140186041 | PHYSICAL-LAYER CHANNEL BONDING - A network device includes a plurality of physical-media entities (PMEs), each corresponding to a distinct channel, to generate transmit signals based on transmit packets received over a media-independent interface. The network device also includes a channel-bonding sublayer to direct the transmit packets from the media-independent interface to respective PMEs of the plurality of PMEs. The channel-bonding sublayer has a substantially fixed delay between the media-independent interface and the plurality of PMEs for the transmit packets. | 07-03-2014 |
20140198865 | OFDM PILOT AND FRAME STRUCTURES - A coax network unit (CNU) receives a first plurality of orthogonal frequency-division multiplexing (OFDM) symbols from a coax line terminal (CLT). The first plurality of OFDM symbols includes continual pilot symbols on one or more subcarriers. The CNU also receives a grant from the CLT allocating a set of subcarriers within a second plurality of OFDM symbols to the CNU. The CNU transmits upstream to the CLT using the allocated set of subcarriers within the second plurality of OFDM symbols. When transmitting, the CNU places non-continual pilot symbols on regularly spaced subcarriers of the allocated set of subcarriers and does not place continual pilot symbols within the allocated set of subcarriers. | 07-17-2014 |
20140313951 | PHYSICAL-LAYER CONTROL CHANNEL STRUCTURE - A coax network unit (CNU) coupled to a coax line terminal (CLT) receives a plurality of orthogonal frequency-division multiplexing (OFDM) symbols from the CLT and identifies a start-of-frame delimiter on a physical-layer (PHY) control channel in the plurality of OFDM symbols. The PHY control channel includes a plurality of contiguous subcarriers. The CNU decodes one or more forward error correction (FEC) code words that follow the start-of-frame delimiter on the PHY control channel. The one or more FEC code words provide PHY control data that include information specifying a structure of a PHY frame that includes the plurality of OFDM symbols. | 10-23-2014 |
20140321258 | WIDEBAND SIGNAL GENERATION FOR CHANNEL ESTIMATION IN TIME-DIVISION-DUPLEXING COMMUNICATION SYSTEMS - A coax network unit (CNU) is coupled to a coax line terminal (CLT). In first and second modes of operation, the CNU transmits data during an upstream window and receives data during a downstream window. In the first mode of operation, a duration of data transmission for the upstream window or a duration of data reception for the downstream window is reduced by a specified amount with respect to the second mode. A sounding signal is transmitted in the first mode in a probing slot that has a duration corresponding to the specified amount. | 10-30-2014 |