Abstract: System and method of generating an index structure for indexing a plurality of unstructured data objects, including: generating a set of compact feature vectors, the set including a compact feature vector for each of the data objects, the compact feature vector for each data object including a sequence of hashed values that represent the data object; generating a plurality of twisted compact feature vector sets for each of set of compact feature vectors, each of the twisted compact feature vector sets being generated by applying a respective random shuffling permutation to the set of compact feature vectors; and for each twisted compact feature vector set, generating an index for the data objects in which the data objects are slotted based on sequences of hashed values in the twisted compact feature vector set.

Abstract: In accordance to embodiments, a base station may transmit to a first user equipment (UE) a downlink control information (DCI) message for uplink (UL) scheduling of a second UE. The DCI message may indicate resources for sending a UL message by the second UE to the base station such that the first UE can at least partially decode the UL message based on the information in the DCI message. The base station may receive the UL message from the second UE. The base station may send a downlink (DL) message to the first UE. The UL message and the DL message may overlap at least partially in time and frequency. If the DL UE cannot successfully decode the UL message, the base station may send a helper message for the UL message to help the DL to decode the UL message.

Abstract: A hybrid electronic optical chip has a first photonic element with which a first diode is associated, a second photonic element with which a second diode is associated and a common electrical driver connected to the first and second diodes by a common electrical connection with opposite polarity. The electrical driver generates a common electrical drive signal divided in time into first and second drive signal components for independently driving the first and second photonic elements through the common electrical connection.

Abstract: An optical fiber comprises a core having an elliptical cross section and a cladding having a circular cross section. The core has an ellipticity between 2 and 40. The core and the cladding have a common central axis with the core being enclosed by the cladding. The difference of a refractive index of the cladding to a refractive index of the core is between 1×10?2 and 1.5×10?1. A trench is located between the core and the cladding. The trench has a uniform width and encircles the core. The refractive index of the trench is lower than the refractive index of the cladding.

Abstract: An optical performance monitor comprises a first stage configured to receive a multiplexed optical signal. The first stage is tunable over a period. The first stage periodically filters the multiplexed optical signal over an optical channel to produce a fine filtered optical signal. A second stage is coupled to the first stage and has a second-stage transfer function. The second stage receives the fine filtered optical signal and produces one or a plurality of interfered optical signal pairs. A third stage is coupled to the second stage and has a third-stage transfer function. The third stage receives the optical signal pairs and demultiplexes the optical signal pairs to produce a plurality of demultiplexed optical signals. The combination of the second-stage transfer function and the third-stage transfer function is flatter over the optical channel than the third-stage transfer function.

Abstract: Network Virtualization can be used to map a virtual network (VN) on a substrate network (SN) while accounting for possible substrate failures, known as the Survivable Virtual Network Embedding (SVNE) problem. The VN can be equipped with sufficient spare backup capacity to sustain the Quality of Service during substrate failures, and the resulting VN may be equipped accordingly. The present application discloses jointly optimizing spare backup capacity allocation and embedding a VN to provide full bandwidth in the presence of a single substrate link failure. A solution may be formulated as a Quadratic Integer Program that can be further transformed into an Integer Linear Program, or as a heuristic.

Abstract: An antenna having an array structure for full-duplex communication on a same wireless resource is provided, as well a network element including such an antenna and a beamforming processor. A method for transmitting and receiving simultaneously on a same wireless resource using such an antenna is also provided. The antenna includes multiple transmit antenna elements, each of these elements coupled to a respective gain-controlled transmit amplifier. The antenna also includes multiple receive antenna elements, each of these elements coupled to a respective gain-controlled receive amplifier. The antenna also includes an electromagnetic isolation structure located between the plurality of transmit antenna elements and the plurality of receive antenna elements.

Abstract: The disclosed systems, structures, and methods are directed to a method for embedding the virtual network onto the elastic optical network comprising embedding the plurality of virtual nodes onto the plurality of substrate optical nodes in accordance with the plurality of location constraints provisioning the primary bandwidth demand associated with one of the plurality of virtual links connecting a source virtual node to a destination virtual node onto a plurality of disjoint substrate paths connecting a source substrate optical node and a destination substrate optical node, and embedding the one of the plurality of virtual links connecting the source virtual node to the destination virtual node onto the plurality of disjoint substrate paths connecting the source substrate optical node and the destination substrate optical node.

Abstract: Methods and systems for scheduling successive transmissions in a wireless local area network (WLAN). An Access Point (AP) can generate a control signal that includes an identifier field for indicating that previous resource allocation from a previous transmission is to be repeated, and therefore the control signal itself does not contain resource allocation information. One or more stations (STAs) can receive the control signal and can use the previous resource allocation information stored in their respective memory to perform the transmission. The resource allocation can include three-dimensional (3D) resource allocation, which refers to time, frequency and space-domain multiplexing. Because the control signal has the identifier field, the AP can reduce network load and free resources for payload data or other traffic.

Abstract: A single-layer substrate integrated directive broadside beam leaky-wave antenna is provided. Opposite ends of a leaky-wave structure are fed with anti-phase versions of a common signal, resulting in broadside frequencies being set apart from the open stopband. To achieve this, the common signal can be split into two equal length paths, one including a perfect electrical conductor (PEC) reflector and the other including a perfect magnetic conductor (PMC) reflector. Alternatively, the common signal can be split into two paths which differ in length by a half wavelength. A power splitter and feed horns can be used in the respective paths. The leaky-wave structure may have transverse slots which increase in width toward a midpoint of the structure. The antenna can be formed in a single planar portion of a lithographic structure, for example by patterning an upper conductive layer thereof.

Abstract: A method for improved efficiency for massive MIMO adaptation. In an embodiment, method for operating a network component in a massive MIMO network includes obtaining, by the network component, one or more network parameters; determining, by the network component, a number of active antennas in a massive MIMO AP to use for transmitting in one time frame according to the one or more network parameters, the number of active antennas selected being less than a total number of antennas available in the massive MIMO AP; and serving one or more UEs using the determined number of active antennas. Other embodiments reduce the number of beamformers utilized according to network parameters. In still other embodiments, a number of data streams to transmit and a corresponding number of users to be served in a time frame by a massive MIMO AP is reduced.

Abstract: A dual polarized waveguide device includes a first waveguide that defines a first linear signal propagation path, a second waveguide that defines a second linear signal propagation path that is parallel to the first linear signal propagation path, and a polarization selective coupling interface coupling the first and second waveguides, the polarization selective coupling interface being configured to enable horizontally polarized signals to pass between the first and second linear propagation paths and prevent vertically polarized signals from passing between the first and second linear propagation paths.

Abstract: A circuit antenna includes an active device, and first and second antennas. The first antenna is connected to an input port of the active device. The first antenna has a first radiation field at an operating frequency of the circuit antenna. The second antenna is connected to an output port of the active device. The second antenna has a second radiation field at the operating frequency. The active device is positioned within the first and second radiation fields to experience an input load matching impedance at the input port and an output load matching impedance at the output port, due to the first and second radiation fields.

Abstract: Methods and systems for data communication in a distributed computing environment include: providing a first network node associated with a first data processing location, the first network node providing provide a network interface for a first distributed computing node at the first data processing location; and forwarding task data flow messages from the first distributed computing node to a second distributed computing node at a second data processing location via a second network node associated with the second data processing location.

Abstract: According to embodiments, there is provided a method apparatus for determining an encoding scheme for transmission of encoded data across a communications channel. The method includes determining the encoding scheme at a design Signal-to-Noise Ratio and evaluating a Frame Error Rate of the encoding scheme. If the FER is not within a target range, the method further includes modifying the encoding scheme until the evaluated FER is within the target range. There is further provided a method and apparatus for mapping bit labels to a plurality of symbols in a constellation, wherein the constellation are organisable into a plurality of sets and each bit label includes a plurality of bit positions. The method includes determining a distance metric between sets and merging pairs of sets according to the distance metric. The method further includes assigning a value to a bit position for bit labels of symbols in the merged set.

Abstract: A photonic platform includes a substrate, a buried oxide layer on the substrate, a first optical layer on the buried oxide layer, the first optical layer including one or more waveguides shaped as rib waveguides protruding upwardly from a common underlying slab and a second optical layer spaced above the first optical layer, the second optical layer defining an upper waveguide that crosses over the one or more partially etched waveguides. A low-loss photonic switch may be made using a silicon photonic platform implementing this waveguide crossing.

Abstract: The waveguide structure is for determining Direction-of-Arrival of a signal received by first and second antennas spaced-apart from one another. The waveguide structure has a first input port connectable to the first antenna and connected to a first splitter; a second input port connectable to the second antenna and connected to a second splitter, the second input port being located adjacent to the first input port; a third splitter; and a fourth splitter. The waveguide structure has branches that connect input ports, splitters and output ports such that each output port provides a superposition of the signal received via the first antenna and the signal received by the second antenna. The waveguide structure has a phase shifting system that imparts at least a relative phase shift between the corresponding branches leading away from each corresponding splitter and has at least one cross-over junction formed between two of the branches.

Abstract: An end fire circularly polarized (CP) substrate integrated waveguide (SIW) horn antenna and a method of manufacturing thereof are described. The antenna includes an input section for receiving radio frequency (RF) waves from a source; and a body extending from the input section for receiving the RF waves from the input section, the body comprising a plurality of radiating units, the plurality of radiating units being configured to radiate circularly polarized waves (CP) in a far field, wherein apertures of the plurality of radiating unit being located along an edge of a planar dielectric substrate, and wherein the horn antenna is in a planar form.

Abstract: A method for failure recovery in a virtual network environment including a virtual network having virtual nodes and virtual links mapped onto substrate nodes and substrate paths, respectively, of a substrate network, the method comprising, in response to an indication of failure of at least one substrate node in the substrate network: re-mapping a virtual node mapped to a failed substrate node to a selected substrate node other than the failed substrate node; and re-mapping a virtual link mapped to a substrate path that involves the failed substrate node to a substrate path that does not involve the failed substrate node; wherein the re-mapping is carried out to achieve at least one re-mapping objective.

Abstract: Aspects of the present disclosure provide methods and devices for multiple access downlink transmissions from a network side component to one or more User Equipment (UE) or multiple access uplink transmissions from two or more UEs to a network side component. In a downlink direction, a network side device generates, for each sub-carrier of the block of sub-carriers, a single constellation point from one or more bits of a multi-bit symbol, from each of multiple layers. In an uplink direction, each UE maps at least one bit from one or more layers of multi-bit symbols onto a subset of a block of sub-carriers. The two or more UEs collectively transmit on the block of sub-carriers.