Abstract: Data in a data structure is compressed by exploiting prior knowledge of the format of the data structure. A portion of the data structure is captured. A metadata component is selected for the portion. A data buffer is updated by using the selected metadata component and the captured portion. This compression technique achieves real-time data compression suitable for use with data structures used for the synchronization of the state of communication entities. The compression technique reduces the volume of data to be communicated for the synchronization of the state of communication entities and, therefore, provides faster synchronization. The present technique is suitable for use in redundant systems.

Abstract: The invention relates to a method for operating a GSM mobile radio system, according to which at least one transmitter, which is allocated to a reference time generator, emits a signal including information concerning a reference time. The signal including the aforementioned information is received by the base stations. Each base station then synchronizes time slots of communications channels with reference to the reference time, said channels being made available via a radio interface between each respective base station and its allocated subscriber station.

Abstract: The invention relates to a Sigma Delta A/D converter (2) for generating a N-bits digital output signal (4) on the basis of an analogue input signal (6), comprising a control loop which comprises a quantizer (8) comprising at least a comparator (24.1, 24.2) for generating the N-bits digital output signal (4) and a D/A converter (10) in a first feedback loop (12) of the control loop for generating an analogue version (14) of the N-bits digital output signal (4) on the basis of the N-bits digital output signal (4), wherein the quantizer (8) also comprises an Up-Down counter (26) which is coupled to the comparator (24.1, 24.2), wherein the D/A converter (10) is coupled to the comparator (24.1, 24.2) in a second feedback loop (27) of the control loop.

Abstract: A system and method for noise cancellation in a signal-processing circuit (e.g., an analog-to-digital converter circuit). Various aspects of the present invention may comprise inputting a first input signal and a digital input signal to the signal-processing circuit. The digital input signal may, for example, comprise a digital dither signal or other processor control signal. The signal-processing circuit may, for example, output a signal comprising a first signal component that is primarily a function of the first input signal and a second signal component that is primarily a function of the digital input signal. The second signal component may be estimated based on estimated behavior of the signal-processing circuit in response to the digital input signal. The estimated second signal component may, for example, be substantially removed from the signal-processing circuit output signal.

Abstract: Provided are a method and system for reducing glitch in a switch circuit. A system includes a current-steering switch circuit including a main differential pair switch coupled to a first tail current having a first current value. Also included is an auxiliary differential pair switch connected to the main differential pair switch. The auxiliary differential pair switch is coupled to a second tail current and configured to substantially reduce a feed-through current associated with the main differential pair switch.

Abstract: A virtual cell management apparatus and method using sectors in an orthogonal frequency division multiplexing mobile communication system including a cell structure having cells each comprised of a plurality of sectors, the cells performing data communication with mobile terminals within a corresponding cell through at least one subchannel having orthogonality.

Abstract: An apparatus compensates for voltage and temperature variations on an integrated circuit with: a voltage sensor having a digital voltage output; a temperature sensor having a digital temperature output; a register coupled to the voltage sensor and the temperature sensor, the register adapted to concatenate the digital voltage output and the temperature output into an address output; and a memory device having an address input coupled to the address output of the register, the memory device being adapted to store one or more corrective vectors.

Abstract: An interactive short message service (SMS) system, which can offer an interactive short message service even in a private wireless network, and a routing method therefor are disclosed.

Abstract: An invention is disclosed whereby a wireless network node, equipped with two or more radio transceivers statically tuned to non-interfering frequency channels, can make decisions regarding which channel to use when communicating with a neighboring wireless node. A multi-radio unification protocol implemented in a wireless node coordinates the use of multiple wireless network interface cards and provides a virtual layer that hides the multiple physical network interfaces from higher layers of a node's network protocol stack. The invention is applicable to wireless networks generally, including those in which some nodes do not have multiple radios or do not recognize the multi-radio unification protocol. The invention makes possible simultaneous transmissions using available channels, thereby reducing interference and delay while increasing the overall capacity of the network.

Abstract: The invention discloses a method of locating and measuring a mobile station, which relates with the radio locating technique in mobile communication field. Comparing with the conventional radio locating technique, the method improves the first path determination method of a neighbor base station downlink signal as follows: with geometrical relationship such as the distance between a MS to the reference base station and the distance between a neighbor base station to the reference base station, an effective range of the downlink signal first path of the neighbor base station can be calculated; the effective range is an effective search window that is shorter than the original large search window, and the first path determination of the neighbor base station downlink signal is made within the effective search window. The invention raises the first path determination accuracy of a neighbor base station downlink signal, so the mobile station locating accuracy is raised too.

Abstract: A bandpass continuous-time delta-sigma modulator. The filters of the modulator are LC resonators directly connected in series. Direct connection of the resonators eliminates the need for active components in the modulator, increases linearity and decreases noise.

Abstract: A direct charge transfer digital to analog converter comprising a single reference voltage linked through a switching structure to a charge accumulation device. An accumulated charge of the charge accumulation system represents the analog output voltage. Use of the single reference voltage in conjunction with the switching structure and charge accumulation system allows for a digital signal to be converted to an analog signal with lower power consumption. Use of a single reference voltage consumes less power and space thereby making it superior to prior art digital to analog conversion systems.

Abstract: A wireless handheld communication device (102) for reducing a communication delay at a proximate wireless communication device is disclosed. The wireless handheld communication device simultaneously transmits to a remote station (106) through a base station (108), and transmits to the proximate wireless communication device (104) directly. The method includes communicating a first communication on first link (116) to a proximate wireless communication device and communicating, simultaneously with communicating the first communication, a second communication on a second link (112) to a base station, wherein the first communication and the second communication are substantially the same.

Abstract: A circuit for correcting the offset of an amplification and filtering chain having a predetermined gain and cut-off frequency depending on the value of at least one capacitor, comprising: a correction means for subtracting from the chain input a correction signal depending on the value of a programmable digital word; a digital automaton for, in a setting phase, searching, then memorizing one of two consecutive values of the digital word between which the output signal of the chain switches sign, the input signal being canceled during a setting phase; and comprising a means for, during the setting phase, reducing the value of said at least one capacitor with respect to its normal operating value.

Abstract: A structure that can be used, for example, to implement a lookup table for a programmable logic device (PLD). The structure includes configuration memory cells, pass transistors, and a buffer. The pass transistors pass the output of a selected configuration memory cell to the buffer, and are controlled by data input signals of the structure. The pass transistors have a first oxide thickness and are controlled by a value having a first operating voltage. The memory cells and buffer include transistors having a second oxide thickness thinner than the first oxide thickness, and operate at a second operating voltage lower than the first operating voltage. The data input signals are provided at the first operating voltage. Some embodiments include data generating circuits that include transistors having the first oxide thickness. Gate lengths can also vary between the memory cell transistors, pass transistors, buffer transistors, and data generating circuits.

Abstract: A network includes an Internet connection element and a plurality of wireless device access points. Each of the plurality of wireless device access points includes a wireless transceiver and each of the plurality of wireless device access points is coupled to the Internet connection element. A location of at least one of the plurality of wireless device access points is represented on a map that is accessible via the Internet.

Abstract: Systems and methods for providing telephone service to transient or inaccessible customers include a stationary cellular telephone that operates like a land-line telephone in that its use is restricted to a single geographic area, such a house address. The stationary cellular telephone can only handoff between cell sites that are associated with the geographic area. The stationary cellular telephone can place calls using only cell sites in a list of permissible cell sites that is maintained at the network level. The stationary cellular telephone is activated by sending customer, device, and/or location identifiers to an activation center via a telephone call. The activation center validates service, and downloads the list of permissible cell sites to the stationary cellular telephone. Dynamic rates provide opportunities for further reduction in the cost of service, with real-time notification of capacity based pricing, and service levels that vary according to network capacity.

Abstract: A method for calibrating a segmented analog to digital signal conversion system is provided. The method includes segmenting a desired relationship between DAC output values and desired ADC input values into a plurality of segments. Each of the plurality of segments includes an offset value and a gain value. The method also includes computing the offset value and an offset coefficient for each of the plurality of segments, computing the gain value and an gain coefficient for each of the plurality of segments, and storing the offset value and the gain value for each of the plurality of segments in a memory unit for reference in converting an analog signal to a digital signal based upon the gain value and offset value.

Abstract: A hands-free, telephone system for a vehicle includes a vehicle appliance configured to read over vehicle speakers and display on a vehicle radio display a voice tag associated with a call incoming to a cell phone paired with the appliance for an operator to hear and view. The appliance uses text-to-speech (TTS) to transfer phonebook entries from the cell phone to memory of the appliance. The appliance uses TTS to read and display text messages incoming to the cell phone for the operator to hear and view. The appliance initiates connecting and disconnecting of the cell phone with the appliance in response to voice commands of the operator. The appliance wirelessly communicates vehicle diagnostic information to another device. The appliance controls vehicle functions in accordance with voice commands of the operator. The appliance receives music files from a device and plays the music files in accordance with operator voice commands.

Abstract: A decoding method includes extracting a preselected number of bits from a bitstream to be decoded, accessing a table entry of a table using an index generated in response to the extracted bit, and if a first value in the table entry indicates a second value in the table entry comprises a decoded result, retrieving the decoded result.