Abstract: In coverage enhancement of machine type communication (MTC), a downlink transmitted bit stream is jointly encoded with uplink payload by the terminal. The combined signal is sent on uplink, to be jointly decoded by the base station that knows the downlink payload and the joint encoding mechanism at the mobile terminal.

Abstract: Techniques for facilitating Machine-to-Machine (M2M) communications include providing an M2M system that implements one or more pre-defined M2M Application Programming Interface (API) profiles, providing a network interface for the M2M system, receiving a profile query over the network interface, and responding with information about the implemented one or more-pre-defined M2M API profiles.

Abstract: Disclosed systems, methods, and computer program products enable high symbol-rate optical Nyquist signal generation with roll-off factors approaching zero by combining digital and all-optical methods. The combined digital and all-optical methods utilize all-optical sine-shaped pulse generation and orthogonal time-division multiplexing with quadrature amplitude modulation using digital Nyquist signals. Disclosed embodiments exhibit inter-channel-interference penalties that are less than 0.5-dB for both 75-GBaud and 125-GBaud optical Nyquist signals, in contrast to conventional signals generated using rectangular waveform driving signals that exhibit penalties greater than 2.5-dB and 1.5-dB for 75-GBaud and 125-GBaud signals, respectively. The disclosed embodiments, therefore, enable significant improvement over conventional systems by reducing inter-channel-interference penalties caused by excess modulation induced bandwidth.

Abstract: Blind polarization demultiplexing algorithms based on complex independent component analysis (ICA) by negentropy maximization for quadrature amplitude modulation (QAM) coherent optical systems are disclosed. The polarization demultiplexing is achieved by maximizing the signal's non-Gaussianity measured by the information theoretic quantity of negentropy. An adaptive gradient optimization algorithm and a Quasi-Newton algorithm with accelerated convergence are employed to maximize the negentropy. Certain approximate nonlinear functions can be substitutes for the negentropy which is strictly derived from the probability density function (PDF) of the received noisy QAM signal with phase noise, and this reduces the computational complexity.

Abstract: Multiple wireless devices in a network perform full duplex communication in which the transmission path and receiving path are spatially separated to allow simultaneous transmission and receiving. The wireless devices can either be controlled using a centralized, or point, coordination function or a distributed coordination function. A full-duplex wireless device senses the medium during transmission by itself and selectively continues the transmission when a signal is sensed on the medium. A full-duplex wireless device measures signal being transmitted by its transmitter and estimates parameters that can be used to cancel the contribution of the locally transmitted signal to the locally received signal concurrently being received during the transmission. The transmit antenna and the receive antenna of a full-duplex wireless device can be configured to be spatially isolated from each other to minimize interference between the antenna functions.

Abstract: Methods and apparatus to realize high spectral efficiency in optical signals transmitted over long distances.

Abstract: Method and apparatus for allocating radio resources for use by mobile user equipment (UE), including sensing available radio spectrum resources, allocating at least a portion of the sensed available resources for use by at least one UE, detecting changes in the radio resource usage situation, and modifying the allocation of resources based at least in part on the detected changes in the radio resource usage situation.

Abstract: Embodiments of the present invention pertain to optical wireless architecture. More particularly, certain embodiments of the invention pertain to a novel method and apparatus to generate millimeter-wave signals with simple and/or low cost architecture. Simple millimeter-wave generation and dispersion-tolerant transmission is based on photonic mixing of two free-running lightwaves and self-mixing down-conversion. More particularly, heterodyne mixing of two free run lightwaves is achieved, wherein one lightwave is modulated by an external modulator driven by electrical data as one of the side-bands of a millimeter-wave signal. Optical to electrical conversion is performed and the millimeter-wave signal is broadcasted by a high-frequency antenna to a receiving side having a local oscillator with self-mixing architecture to down-convert the radio frequency to its baseband form.

Abstract: Techniques for unified optical network unit power management in a passive optical network include operating an optical network unit (ONU) in a first state in which a transmitter of the ONU is turned off and a receiver of the ONU is turned on, operating the ONU in a second state in which both the transmitter and the receiver are turned off, and transitioning the ONU directly between the first state and the second state, based on a power management rule.

Abstract: Methods and a system for migrating a network segment from one technology and/or admin domain to another may involve migrating software, hardware, and the management system from one administrative domain and/or paradigm to another. It is possible to achieve both real-time migration and soft-migration (e.g., by using transition gateway) of a network segment beginning from a set of logical and physical ports (including topology) to service specific flow level migration.

Abstract: A method of using synchronization signal as demodulation reference signal is performed at an eNB in case that the demodulation reference signal is punctured by synchronization signal in a wireless communication network. The method comprises: determining whether there is a resource element collision between the demodulation reference signal and the synchronization signal; in accordance with a determination that there is a resource element collision between the two signals: using the synchronization signal as the demodulation reference signal in a PRB pair containing the synchronization signal; and transmitting the synchronization signal as the demodulation reference signal to a UE.

Abstract: A multi-wavelength passive optical network (MW-PON) includes an optical distribution network (ODN), a plurality of optical line terminations (OLTs) and an optical network unit (ONU). The ODN includes a trunk fiber, one or more branching elements, and a plurality of distribution fibers. Each OLT is associated with an individual bi-directional wavelength channel using a corresponding single downstream wavelength and a corresponding single upstream wavelength, and supporting a specific downstream line rate and one or more distinct upstream line rates. The ONU is communicatively coupled to a respective distribution fiber, being tunable over a specific range of downstream wavelengths and a specific range of upstream wavelengths, and supporting a specific downstream line rate and a specific upstream line rate.

Abstract: An apparatus and method for receiving and transmitting data is disclosed. In one exemplary embodiment, the method includes: controlling a data source output source frames at a first data rate; receiving a source frame at an encoder at the first data rate; reading a fixed number of n-byte data blocks from the source frame, wherein n is an integer; appending an (m-n)-byte parity block to each n-byte data block to form the fixed number of m-byte first code words, wherein m is an integer greater than n; prepending to the fixed number of m-byte first code words a first prefix to form an error correcting physical frame, the first prefix including an error correction indicator set to a first value and an extra data indicator set to a second value; and transmitting the error correcting physical frame at a fixed transmit data rate.

Abstract: Techniques, devices, and systems that include mechanisms for connectionless communications in wireless communication networks or systems include a base station controller, a plurality of base stations and a mobile station. The base station controller combines connectionless transmissions received by the base stations, including decoded and un-decoded frames, into a complete message.

Abstract: An optical transmitter transmits an orthogonal frequency division multiplexing symbol in which only one-half of available subcarriers are modulated with data and the remaining subcarriers are suppressed by not modulating with data. The transmission is of duration equal to half the symbol period of the OFDM symbol, resulting in a half-cycle transmission. An optical receiver receives the half-cycle transmission OFDM symbol, regenerates the full time domain representation and recovers data modulated on the one-half of available subcarriers. The modulated subcarriers and the suppressed subcarriers alternate in the frequency domain.

Abstract: A method of Noisy Window and associated management messages to support set splitting if activating ONUs with uncalibrated transmitter, offering a power grant for unmodulated upstream transmission, measuring the average received optical power in all upstream wavelength channels and providing downstream indication of the upstream wavelength channel with abnormally high average received power.

Abstract: The present invention relates to optical transmitters, transceivers, and transponders used for transmission of information or data in any form through a physical medium dependent (PMD) network. The speed of such networks depends, in part, on the density of information that can be transmitted through the physical medium. Optical transmitters or transceivers can be used to transmit multiple independent signals simultaneously through the same medium using different directions or axes of polarization, where the difference in the directions or axes of polarization can be used to distinguish the multiple signals at the receiver. In this invention, we use a master laser (l0) to synchronize two slave lasers (l1 and l2) by its x-polarization and y-polarization components of carrier, respectively, so that two slave lasers can be enforced to lock on exactly the same wavelength l0 with perpendicular polarization directions.

Abstract: A method and an apparatus for self-calibration of an ONU receiver in a multi-wavelength PON system, said method including the initial physical layer scan of the receiver tuning range, distributed estimation of the down-stream wavelength channel drift with respect to the nominal standard-based wavelengths, and reporting the estimated downstream wavelength channel drift in the downstream Channel_Map message.

Abstract: Aspects of the present invention include apparatus and methods for transmitting and receiving signals in communication systems. A multicarrier generator generates a multicarrier signal. An optical demultiplexer separates the multicarrier signal into separate multicarrier signals. At least one QPSK modulator modulates signals from the separate multicarrier signals. An optical multiplexer combines the QPSK modulated signals into a multiplexed signal. The multiplexed signal is then transmitted.

Abstract: Apparatus and methods for improving a coverage of an uplink Voice over IP (VoIP) transmission of a wireless device are disclosed. A wireless device assigns a first hybrid automatic repeat request (HARQ) process to a first VoIP packet of the wireless device. The wireless device then assigns a second HARQ process to a second VoIP packet of the wireless device. The wireless device then transmits the first and second VoIP packets to a base station.