Abstract: Some aspects and embodiments of the present invention provide effective mechanisms for provisioning virtual networks on communication networks. In particular some aspects and embodiments provide an effective mechanism for embedding a virtual network into a multi-layered substrate network which utilizes a different communication technology at each layer. One such example is an IP network overlaid over an optical network, such as an OTN network. Embodiments jointly determine the assignment of virtual nodes and virtual links. Assigning the nodes and links together can provide for a more optimal solution than assigning the nodes and the links separately. Some embodiments generate a collapsed graph which includes the optical network and the IP network in a single layer. Accordingly some embodiments jointly determine the assignment of virtual nodes and virtual links within such a collapsed graph, which can provide more optimal assignments than considering assignments within each layer separately.

Abstract: A non-reciprocal mode converting SIW includes a first straight SIW section, a second straight SIW section, and a curved SIW section coupling the first straight SIW section to the second straight SIW section. The curved SIW section included magnetic biasing at opposed corner regions. The magnetic biasing and a curvature of the curved SIW section causes: (i) a wave in a first transverse electric (TE) mode that propagates in a forward direction from the first straight section through the curved SIW section into the second straight SIW section to convert to a second TE mode, and (ii) a wave in the first TE mode that propagates in a reverse direction from the second straight SIW section through the curved SIW section into the first straight SIW section to maintain the first TE mode.

Abstract: Systems and methods are disclosed that attempt to increase spectral efficiency by using Faster-than-Nyquist (FTN) transmission. In one embodiment, a method at a transmitter includes partitioning bits into K bit streams, obtaining K power scaled symbol streams, combining the K power scaled symbol streams to obtain a stream of transmission symbols, and transmitting the stream of transmission symbols using FTN signaling. At the receiver, the received symbols are partitioned into K symbol streams, and demodulation and decoding is performed by: (i) demodulating and decoding the Kth symbol stream of the K symbol streams to obtain a Kth set of bits; (ii) mapping the Kth set of bits to a Kth set of symbols; and (iii) for each one of k=K?1, . . . , 1: demodulating and decoding a kth symbol stream of the K symbol streams to obtain a kth set of bits. The demodulating and decoding includes performing interference cancellation.

Abstract: Embodiments are provided for path flow scheduling of multicast traffic through a network. The paths for traffic flow are determined to optimize link utilization in terms of bandwidth and link capacity, and limit link cost. In an embodiment, a method is implemented for network flow scheduling. The method includes establishing, by a controller of a network, a multicast tree which includes a plurality of links for sending multicast traffic from a source to multiple destinations. The tree is established based on minimizing a number of links in the multicast tree. The tree is then adjusted by replacing one or more of the plurality of links to reduce the link utilization. The tree adjustment is repeated by further replacing one or more links in the multicast tree to further reduce the link utilization.

Abstract: A receiver includes a planar antenna array including at least three antennas. Each antenna simultaneous receives a local oscillator (LO) signal from a near field region and a radio frequency (RF) signal from a far field region. Each antenna is coupled to a respective quasi-optical mixer. Each quasi-optical mixer includes only passive components and outputs a respective intermediate frequency (IF) signal. The receiver includes two six-port demodulators. Each six-port demodulator receives a different pair of IF signals as input and outputs signals representing baseband power of the pair of IF signals. Each six-port demodulator includes only passive components. The receiver also includes a processor to calculate direction of arrival (DoA) for the LO signal and the RF signal using the output from the six-port demodulators.

Abstract: Methods and systems for scheduling jobs in a distributed computing environment include: obtaining a set of task identifiers, each task identifier identifying a corresponding data processing task included in one of a plurality of jobs to be scheduled for execution at one of a plurality of data processing locations; and selecting and scheduling a data processing task of the identified job having a longest optimal completion time to the data processing location corresponding to the optimal completion time of the selected data processing task.

Abstract: The present disclosure relates to an analog-to-digital converter (ADC) and a method for controlling an ADC. The ADC includes a plurality of quantization levels for analog-to-digital conversion. The ADC is adapted for utilizing a subset of the plurality of quantization levels for analog-to-digital signal conversion. The subset is formed by selecting at least one level to be deactivated using a greedy search method and deactivating the at least one level. The method includes using a subset of the plurality of quantization levels for analog-to-digital signal conversion, the subset being formed by selecting at least one level to be deactivated using a greedy search method and deactivating the at least one level.

Abstract: Methods for transmitting over a wireless channel from a plurality of transmit chains are provided, as well as apparatuses for performing the methods. Each transmit chain has a variable gain power amplifier coupled to an antenna element. A subset of at least two transmit chains is selected from the plurality of transmit chains. A gain of at least one of the variable gain power amplifiers is set in accordance with the modulation scheme. Respective beams are transmitted with each transmit chain in the subset. Each respective beam represents a component of a modulated signal according to a modulation scheme, so that the beams combine over the wireless channel to form the modulated signal.

Abstract: A method for managing a cache memory network is disclosed. The method comprises estimating the popularity of a piece of data content according to an extreme learning machine, and managing the cache memory network according to the estimated popularity of the piece of data content. Estimation may be performed upon a request for the piece of data content, and may be accordingly cashed into an appropriate cache memory device upon estimation of its popularity.

Abstract: Embodiments are provided to enable effective cancellation or reduction of the self-interference (SI) introduced when applying full-duplex transmission to MIMO systems. A method embodiment includes forming, using a first component matrix of a precoding matrix generated in accordance with signal channel conditions, a plurality of beams for a plurality of transmit signals, and forming, using a second component matrix of the precoding matrix, a plurality of SI cancellation signals corresponding to the transmit signals. The first component matrix is arranged to maximize a sum-rate of transmissions in the transmit signals assuming zero SI in the network component. The second component matrix is arranged to maximize SI suppression in a plurality of receive signals in the network component. The beams are transmitted at a plurality of antennas, also used to receive the receive signals. The SI cancellation signals are added to the receive signals to detect corrected receive signals.

Abstract: Systems and methods of precoded faster than Nyquist (FTN) signalling are provided. In the transmitter, Tomlinson-Harashima Preceding (THP) is applied to produce precoded symbols. The THP is based on inter-symbol interference (ISI) due to using faster than Nyquist (FTN) signalling. An inverse modulo operation is not performed in the receiver. Instead, in the receiver, FTN processing is performed based on a matched filter output by determining log a-posteriori probability ratio LAPPR values computed for an nth bit bn of a kth received symbol and pre-computed a-priori probabilities of an extended constellation for a given pulse shape h(t) and FTN acceleration factor combination.

Abstract: A transceiver with a spectrum sensing unit configured to detect, within a plurality of millimeter wave bands, one or more channels with tolerably low interference for selection. The transceiver has a transmitter configured to modulate a transmit signal to an output transmit signal using a transmit carrier frequency compatible with a transmit channel selected from the one or more channels, and using a transmit duplexing operating mode compatible with a transmit millimeter wave of the plurality of millimeter wave bands that correspond to the transmit channel. The transceiver has a receiver configured to demodulate a receive signal from an input receive signal using a receive carrier frequency compatible with a receive channel selected from the one or more channels, and using a receive duplexing operating mode compatible with a receive millimeter wave of the plurality of millimeter wave bands that correspond to the receive channel.

Abstract: An optical transmitter including an optical waveguide and N microring resonators (MRRs) coupled to the optical waveguide is provided. In such an optical transmitter each of the N MRRs having a different coupling coefficient determining the amount of coupling to the optical waveguide, wherein N>1. In some embodiments, each of the N MRRs has a different spacing distance from the optical waveguide, wherein the coupling coefficient for each MRR is dependent on the spacing. In some embodiments the optical transmitter further includes an input for receiving N drive signals from a controller, each drive signal shifting the resonant wavelength of the corresponding MRR to control the optical power coupled in the corresponding MRR from the optical waveguide in which an optical signal propagates.

Abstract: Cell switch-off (CSO) methods for base stations (BSs) in a wireless network are provided. The CSO methods utilize quality of service (QoS) requirement information of user equipments (UEs) to determine which BS to switch off according to a pre-defined criteria. The criteria is defined so that impact of switching off a BS on the UEs may be reduced, and/or QoS requirements of at least some of the UEs may be satisfied if a BS was switched off.

Abstract: A time domain multiplexed (TDM) routing schedule for a wireless mesh network can be generated using a Markov chain process. In particular, synchronized paths between access nodes and gateways in the mesh network can be added to, and removed from, the TDM routing schedule in an iterative fashion according to each individual state in a state progression of a Markov chain, with each state of the Markov chain mapping a different combination of synchronized paths to the TDM routing schedule. In some embodiments, transitioning between states of a Markov chain is performed according to a proportionally fair transition rate.

Abstract: A method and apparatus for monitoring and feedback control of a photonic switch such as 2×2 Mach-Zehnder Interferometer switch. Optical signals at an input and an output of the switch are monitored via optical taps. A sinusoidal time-varying phase shift is applied to one of the monitoring signals. An optical combiner then combines the monitoring signals. A photodetector monitors output of the optical combiner to provide a feedback signal. The amplitude of the feedback signal due to the time-varying phase shift increases with the amount of input signal present in the output signal. When the input signal is to be routed to the output (e.g. for a bar state), a controller manipulates the switch to maximize feedback signal amplitude. When the input signal is to be routed to a different output (e.g. for a cross state), the controller manipulates the switch to minimize feedback signal amplitude.

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: A system and method are presented for coupling OAM optical beams to optical fibers. The system may include, for instance, an OAM beam generator, for receiving one or more of a plurality of input signals, and generating a different OAM mode signal for each input signal. The OAM beam generator may further be operative to adjust a location and/or an exit angle of the one or more OAM mode signals before sending the one or more OAM mode signals to a beam combiner that combines the one or more OAM mode signals into a combined mode OAM transmission. The system may further include a controller in communication with at least one crosstalk estimate sensor and the at least one OAM beam generator, the controller operative to optimize the crosstalk estimate by receiving the crosstalk estimate for one of the OAM mode signals, and sending control instructions instructing the OAM beam generator to adjust a location and/or an exit angle of the one or more OAM mode signals to reduce the crosstalk estimate.

Abstract: System and methods are disclosed in which an uplink frame is configured to accommodate each, some, or all of the following types of access: (1) demand assigned access in which a UE requests resources and is then granted a partition of resources of the uplink frame; (2) free assigned access in which one or more UEs are granted a partition of resources of the uplink frame without UEs requesting the grant of the resources; and (3) random access in which a partition of resources of the frame are used by UEs for random access communication. The frame may be configurable on a semi-static or dynamic basis. In this way, the base station may be able to better accommodate UEs having different traffic characteristics and/or different latency requirements.

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.