Abstract: A system and method for echo and near end cross talk (E/N) cancellation in a communications system using a pair of FIR filter ICs, wherein a first FIR filter IC filters a plurality of low amplitude E/N signals and a first portion of a plurality of data bits of a plurality of high amplitude E/N signals, and a second FIR filter IC filters a second portion of the data bits of the high amplitude E/N signals which cannot be filtered by the first FIR filter IC. The output values from the two filters are then summed to produce the E/N cancellation signal. The present invention allows for the use of lower bit-resolution, lower power consumption, and less expensive filter ICs than conventional FIR filters implemented in a single IC.

Abstract: The invention relates, inter alia, to a transmitter device, in particular for a base transceiver station in a mobile radio system, which has a digital modulator for making available a signal containing a phase information, and a modulation closed loop having a digital phase comparator operating at baseband whose first input is connected to the output of the digital modulator. In addition, a controllable oscillator is provided for generating an RF transmission signal at a controllable transmission frequency, a device which is assigned to the controllable oscillator and has the purpose of converting the RF transmission signal into a baseband signal containing a phase information. The output of the converter device is connected to a second input of the digital phase comparator.

Abstract: A technique for performance-monitoring of a standard SONET signal involves first converting the optical signal to an electrical signal, removing in the framing signal time slot the framing signal for leaving only the framing signal noise in such time slot, and separating the framing signal noise from the data signal for viewing as a measure of the quality of the SONET signal.

Abstract: A line card and method is provided which supports symmetric and asymmetric telecommunication services, such as symmetric and asymmetric DSL services. The line card may support concomitantly POTS and asymmetric DSL services or support DSL services. A xDSL interface provides processing for DSL signals and a POTS interface provides processing for POTS signals. The line card is capable of switching operating modes or which services it is supporting. Preferably, the line card is capable of switching operating modes during a communication session. The line card may switch modes based on instructions received from external devices, such as CPE or far end equipment, based on preprogrammed software or based on operation of the line card.

Abstract: A communication system's transmit configuration is reconfigured based on mobile station associated conditions such as the capability of the mobile receiver, carrier to interference or signal to noise ratios, and the degree of mobility associated with the mobile station. As a result, the transmit configuration is optimized for the conditions associated with a particular mobile receiver. In one embodiment, the transmit configuration may be selected to operate in configurations such as a single transmit antenna configuration, a space time spreading configuration, a selective transmit diversity, and a multi-output and multi-input configuration.

Abstract: A wireless communication system and method includes antenna arrays at both the transmitter and receiver having a plurality of elements for very high data rate communication. Phased array antennas or directive fixed beam antennas are used with a beamwidth in azimuth and elevation less than 30° to increase the power margin and to decrease the delay spread of signals at the receiver to permit wireless data communications at high data rates in closed environments, for example, bursty transmissions and isochronous communications. The wireless communication system is capable of data transmission rates which exceed 1 Gbps with propagation losses of up to at least 60 dB relative to one meter.

Abstract: The present invention is a core interface mechanism that permits 1:N type port protection on the core side of the switch such that core bandwidth is not wasted by the direct connection of service cards to the switching core. In an exemplary embodiment, a core interface module supports up to two active service cards and one dedicated protection service card. To provide increased efficiency and lower cost the redundant service card does not strand user bandwidth in the switch core. In an exemplary embodiment, the core interface includes a plurality of core side input and output ports for coupling to the switching core and a plurality of card side input and output ports for coupling to the service cards. A data flow switch function couples between the core side ports and the card side ports. The data flow switch function operates to complete data flow paths between the core side ports and the card side ports.

Abstract: A method and apparatus for enhancing the security of password security systems. The authorization decision related to passwords is based not only on entry of the correct characters in the correct sequence but also on the keystroke sequence timing associated with the typing habits of an authorized user. The keystroke sequence timing provides an additional security measure to each password similar to signature or fingerprint systems. Particularly, each person has a unique typing style and this uniqueness is captured in the present invention as keystroke sequence timing and used as an additional recognition means.

Abstract: The invention proposes a device for providing tunable high-frequency and/or radio-frequency comprising within one IC-package at least four signal paths providing at least two input and at least two output ports (rf-port1, rf-port2, rf-prot3, rf-port4) at least one active component (T) and at least one variable passive component (C1, C2) connected at least with an input port of the active component (T), and at least one control path for controllable tuning the at least one variable passive component (C1, C2).

Abstract: A synchronization system in accordance with the principles of the invention includes a central synchronizing management unit, at least one synchronization distribution unit, and at least one network element. Each synchronization distribution unit receives synchronization and management information from the central synchronization management unit. This information may be transmitted directly from the central synchronization management unit, or it may be transmitted though another synchronization distribution unit in a group of a daisy-chained synchronization distribution units. The daisy-chained arrangement employs both active and passive optical paths. The central synchronizing management unit may query any synchronization distribution unit within the system to obtain performance statistics.

Abstract: A system and method is provided for communicating in a wireless communication system which supports link adaptation or link adaptation and incremental redundancy. The invention provides link adaptation at multiple code rate by dividing fixed length RLC blocks into coded sub-blocks. CRC code may be appended to the RLC blocks for error detection. The sub-blocks are then grouped into transmission units for transmission. The number of sub-blocks in each group is varied to provide multiple code rates. Headers are used to identify the transmission units being transmitted. In the case of retransmission, the transmission units may be expressly identified through extended headers. One or more of the originally transmitted sub-blocks are dropped and replaced by the extended headers in the retransmission. Accordingly, the present invention provides for a retransmission code rate which may be different from the code rate at which the transmission units were originally transmitted.

Abstract: In a PRACH channel, colliding signals are resolved by use of a number of training-like symbols in the colliding data payloads. The signals are estimated by spatio temporal filters running a training-based or semi-blind algorithm, and a selection criterion is applied to the estimated signals, such as distance from the finite alphabet or the mean square error.

Abstract: The present invention provides a method and apparatus for re-sequencing data packets received from multiple devices in a packet-based digital communication system. A set of data packets is received by a data packet sequencer. Each data packet includes an indicator of the originator of the data packet. The data packet sequencer stores the set of data packets, preferably in an input buffer. The data packet sequencer reorders the data packets by retrieving a first data packet and determining the originator of the first data packet. The data packet sequencer then transmits all data packets that were originated by a first originator of the first data packet prior to transmitting data packets that were not originated by the first originator.

Abstract: An organic field effect transistor (FET) is described with an active dielectric layer comprising a low-temperature cured dielectric film of a liquid-deposited silsesquioxane precursor. The dielectric film comprises a silsesquioxane having a dielectric constant of greater than 2. The silsesquioxane dielectric film is advantageously prepared by curing oligomers having alkyl(methyl) and/or alkyl(methyl) pendant groups. The invention also embraces a process for making an organic FET comprising providing a substrate suitable for an organic FET; applying a liquid-phase solution of silsesquioxane precursors over the surface of the substrate; and curing the solution to form a silsesquioxane active dielectric layer. The organic FET thus produced has a high-dielectric, silsesquioxane film with a dielectric constant of greater than about 2, and advantageously, the substrate comprises an indium-tin oxide coated plastic substrate.

Abstract: An optical dynamic gain equalization filter (DGEF) comprises a planar arrangement of preferably “perfectly sampled” (or alternatively oversampled) waveguide grating routers (WGR's) connected by individual optical paths each containing a Mach-Zehnder interferometer operated in a push-pull fashion so that a positive phase change in one interferometer arm and a corresponding negative phase change in the other interferometer arm produces a desired change in attenuation while, at the same time, the overall phase of the optical signals after passing through the Mach-Zehnder interferometer is kept constant with respect to the adjacent paths. Alternatively, the above-described arrangement is effectively “cut in half”, and its size effectively also reduced accordingly, using a mirror placed at the midpoint of the device and an appropriate circulator to separate the input and output optical signals.

Abstract: A method to adjust the burst transmission duration time, in a high speed digital wireless communication system, to provide sufficient time for the transmission of data when all the data is not available at the time of transmission. According to the method of the invention, after the burst transmission is begun, the burst is maintained active as additional data is selected within a known time period following the previous detected data packet and the detected data is appended to the active burst transmission. The invention further terminates the burst duration when no additional data is detected within the redefined time period following the previous detected data packet.

Abstract: The present invention enables APs to communicate with CNs in a backhaul network configuration in such a manner that the network is dynamically and adaptively self-aligning in terms of bandwidth utilization. A technique known as Black bursts is adapted to a backhaul network configuration to enable access instants in communicating between APs and CNs to be automatically and dynamically self re-aligned in response to APs entering and leaving the network. Thus, APs are not required to explicitly inform each other of these changes. Real-time APs are given priority over non-real-time APs in order to ensure that real-time traffic meets bounded end-to-end delay requirements. This is accomplished by decreasing the period of time that real-time APs must wait while the channel is idle before accessing the channel relative to the time period that non-real-time APs must wait before accessing the channel.

Abstract: A tunable optical lens includes a solid refractive optical lens, a channel adjacent to the solid refractive optical lens, and an extended body of liquid. A portion of the body forms at least part of an aperture stop for the lens. The portion of the body forms a meniscus that protrudes from or into the channel. The liquid is light-absorbing in the visual spectrum and/or in the near-infrared spectrum.

Abstract: A quantum well structure is provided that includes two or more quantum well layers coupled by at least one barrier layer such that at least one of a piezo-electric field and a pyro-electric field is produced. The quantum well structure is sufficiently doped to cause a Fermi energy to be located between ground states and excited states of the coupled quantum well layers. The quantum well structure can be incorporated into a layered semiconductor to form optical devices such as a laser or optical amplifier.

Abstract: Apparatus comprising: a first substrate; a dielectric layer comprising a first dielectric material on the first substrate, the dielectric layer having a dielectric layer thickness and being traversed by through holes passing from an interface with the first substrate, to an opposite side of the dielectric layer; and a second dielectric material at least partially blocking the through holes. Methods for making such apparatus.