Abstract: The present invention provides a methodology for selectively enabling and disabling mobile assisted handoff (MAHO) in a TDMA wireless communication system on a per-mobile station basis based on a triggering signal. The triggering signal identifies the mobile station or set of mobile stations for which the MAHO feature is to be disabled. The triggering signal may originate at a base station or a mobile switching center (MSC) by a system technician. The triggering signal may also originate from a served mobile station and contain information about a position of the served mobile station. In this latter case, if the served mobile station has not moved from a previous position, the serving base station disables MAHO for the served mobile station. A MAHO disable signal uniquely identifies those mobile stations for which MAHO is to be disabled. When a served mobile station receives such a disable signal, it ceases to transmit signal quality information.

Abstract: A method and apparatus implementing a “1+1” protection scheme using two interface cards (transmitter and receiver) having a mathematically provable uptime rate.

Abstract: Incoming calls from selected calling numbers are routed to call waiting for immediate response while calls from other calling numbers are handled in a different manner, e.g., they are routed to voice mail, to a forwarding number, or scheduled for call back. In order to route calls from selected calling numbers to call waiting, the subscriber enters the directory numbers of selected callers (or other caller identifying indicia) on the subscriber's telephone keypad together with an activation code for storing this information in a caller identification (ID) table, or data base. Each time an incoming call is received, the incoming call number (or other caller identifying indicia) is compared with the contents of the caller ID table and the call is routed to the call waiting function if the incoming call number is stored in the caller ID table.

Abstract: A method for adjusting the power of a probe signal to be transmitted by user equipment to system equipment of a wireless communication system. The power of the probe signal is adjusted based on information received by the user equipment from the system equipment. The information is a local mean of RSSI at the system equipment. The adjusted probe signal is transmitted and thus has an increased likelihood of being detected by the system equipment. Also, the power available for transmitting the probe signal is used more efficiently when the probe signal is adjusted in accordance with the local mean information received by the user equipment from system equipment of the wireless communication system.

Abstract: A surveillance system is mounted to a vehicle to record visual or audio data of areas in and around the vehicle. In the event of an impact on the vehicle, a sensor determines the level of impact (202). If the level of impact is of a predetermined force, then the sensor activates a cut-off timer to stop the recorder from recording a predetermined time after the impact (204). If there are multiple impacts on the vehicle of at least the predetermined force, then the cut-off timer is reset to add time to the predetermined time based on the number of impacts of the predetermined force (206, 208).

Abstract: A method and apparatus for efficient list decoding of Reed-Solomon error correction codes. A polynomial for a predetermined target list size combining points of an error code applied to a message and points of a received word is determined for a k dimensional error correction code by a displacement method. The displacement method finds a nonzero element in the kernel of a structured matrix which determines the polynomial. From roots of the polynomial, it is determined if the number of errors in the code word is smaller than a predetermined number of positions for generating a list of candidate code words meeting the error condition. In one embodiment, parallel processing is used for executing the displacement method. The invention will be more fully described by reference to the following drawings.

Abstract: A method for use in a receiver in an orthogonal frequency division multiplexing-based data transmission system of detecting frame synchronization with respect to a signal received from a transmitter in the system comprises the following steps. First, the received signal is searched at a first predetermined sub-carrier frequency and at least a second predetermined sub-carrier frequency for a previously inserted data pattern. Then a frame boundary in the received signal is identified as a position where the data pattern is detected at both the first predetermined sub-carrier frequency and the second predetermined sub-carrier frequency.

Abstract: The present invention provides a transistor device that does not experience the problems associated with the prior art transistor devices. The transistor device includes a dielectric region located in a trench in a semiconductor substrate and a source region and a drain region located in the trench. The source region and drain region are at least partially on the dielectric region. The transistor device further includes a channel region located in the trench between the source region and drain region and at least partially on the dielectric region.

Abstract: In a wireless communications system having a centralized interworking function (IWF) and geographically distributed base stations, a packet-oriented frame selection/distribution (FSD) function forwards forward-link user data intended for a particular mobile unit directly to a primary base station, which determines whether to transmit the forward user data to the mobile unit using a fundamental channel or a supplemental channel. If the data is to be transmitted using a fundamental channel, when the base station is operating in soft handoff, the forward user data is transmitted from the primary base station back to a circuit-oriented FSD function for forwarding to all of the base stations currently participating in the soft handoff, so that all of the base stations can transmit the forward-link user data to the mobile unit at the same time.

Abstract: Superconducting copper oxides of the perovskite structure are modified to have mixed occupancy of a cation site, thereby resulting in increased limits in critical field and/or critical current. Mixed occupancy may be observed in terms of increased resistivity as the superconducting material reverts to a nonsuperconducting state. A significant advantage, at least for preferred compositions, derives from the fact that critical temperature is unaffected relative to the prototypical material.

Abstract: An uncorrelated Michelson interferometer is formed with single mode optical fiber. In a first embodiment, light is transmitted into an optical 3 dB coupler, and split into a transmission down a first optical fiber and transmission down a second, significantly longer second optical fiber. In the disclosed embodiment, the second optical fiber path may be several meters, and even hundreds of meters longer than that of the first fiber optic path. The light at the ends of the respective first and second fiber optic paths is reflected back into the single mode optical fiber, and coupled in the optical coupler. In the first embodiment, since the second fiber optic is relatively long, an unknown amount of rotation of the polarization would otherwise occur. Thus, a polarization controller is used to control the polarization in the longer, second optical fiber such that a maximum signal is output from the optical coupler.

Abstract: In accordance with the invention, a WDM optical communication system includes a new tunable multi-channel dispersion compensating filter having low loss, low polarization dependence and capable of compensating many channels over a large wavelength range. In essence, the filter comprises an optical cavity with a near 100% reflector on one side and a variable partial reflector on the other side. The device acts as a tunable all-pass filter.

Abstract: Techniques for determination of network parameters in, e.g., a processor-implemented system for characterizing, adjusting or optimizing the performance of a wireless network. In an illustrative embodiment, values of one or more link parameters of the wireless network are interpolated along edges in a mesh of data points derived at least in part from road location data characterizing an area serviced by the wireless network. A measure of network performance, e.g., a coverage measure based on pilot signal-to-interference ratio, may be generated using the interpolated values. The edges of the mesh have associated therewith a set of edge weights representative of traffic in the wireless network. The edge weights may be adjusted so as to be in agreement with available network traffic data.

Abstract: A method for programming of a plurality of programmable devices arranged in a JTAG boundary scan chain takes advantage of knowledge of a target system. The method speeds device programming and reduces system memory requirements. Raw data is extracted from high-level files. The raw data is stored in the target system. JTAG boundary scan chain information is coded into device programming software. Alternatively, the JTAG chain information is stored as data in the target system. The device programming software treats JTAG I/O registers of the programmable devices as concatenated shift registers. Data packets are assembled that include, for example, a byte of programming information, for each of the devices. The packets are shifted through into the JTAG chain. Bytes of the packet are aligned with, and loaded into, respective devices. Optionally, the validity of data loaded is checked by comparing it to the stored raw data. Invalid data is reprogrammed.

Abstract: A distortion manager and a method of managing distortion for use with an acoustic echo canceler. In one embodiment, the distortion manager includes a coherence ascertainer coupled to an adaptive distortion adder. The coherence ascertainer determines a coherency between audio streams and the adaptive distortion adder selectively adds non-linear distortion to at least one of the audio streams based on the coherency.

Abstract: A network-based CODEC (coder-decoder) includes an echo canceler. This CODEC recognizes the presence of a data call by detecting predefined signaling portions of a modem handshaking process. For each detected data call, the CODEC uses a stored channel model for performing echo cancellation during the data call. The CODEC trains off-line during selected segments of the modem call and then stores the new channel model for use in a future data call.

Abstract: Apparatus, and a method for flexibly switching telecommunication signals. A plurality of input bit streams are connected to a telecommunications switching network fabric element comprising a microprocessor system including memory. The microprocessor system, under program control, performs switching and protocol conversion functions on the input streams in order to generate output streams. Advantageously, a single element is able to concurrently switch input signals in a variety of protocols, including circuit switching protocols, such as Pulse Code Modulation (PCM), and packet switching protocols, such as Asynchronous Transfer Mode (ATM) protocols and Internet Protocol, (IP). Where desirable, the microprocessor system can also control the protocol conversion of input signals in one protocol to output signals in another protocol.

Abstract: A base station in a soft handoff adjusts its transmit power level by a first amount if the base station is participating in a soft handoff and by a second amount if the base station is not participating in the soft handoff, i.e. in simplex mode. The first and second amounts are different. In one embodiment of the invention, the adjustment is performed by using a down-step size that is larger in magnitude than an up-step size when the base station is in soft handoff. The transmit power level is then adjusted by the smaller up and larger down step sizes when the base station receives an indication to adjust the transmit power level. The step sizes used when the base station is in simplex mode is larger than the up-step size and smaller than the down step size.

Abstract: A photorecording medium contains a polymeric matrix, typically cross-linked to provide a desired level of physical stability, and a photoimageable system containing a photoactive monomer. Unlike previous polymer media, which tend to contain a substantially homogeneous dispersion of photoimageable system and matrix polymer, the matrix and photoimageable system of the invention are phase separated, yet still exhibit low light scattering such that useful holographic properties are possible.

Abstract: High speed data transfer from a base station to a mobile terminal is provided using an additional wide band communication channel that supplements the communications provided by the reverse (mobile to base station) and forward (base station to mobile) links used in cellular or PCS communications systems. In one embodiment, the standard forward and reverse links are used as control channels for data transfers over the additional or adjunct forward wide band channel. In another embodiment, the communications carried out over the narrow band forward link channel are sent over the adjunct wide band forward channel thereby eliminating the need for a narrow band forward link channel.