Abstract: A system and method is proposed to significantly reduce the peak to average power ratio (PAPR) for an OFDM system by stabilizing the signal envelope. By using partial response (PR) signaling to spread each sub-symbol over multiple subcarriers, the signal is first compress in time. The signal is then rearranged such that it is possible to stabilize the envelope at some constant value ?, thus improving the PAPR without using excessive time-bandwidth resources.

Abstract: The invention relates to a calibration method and a calibration arrangement for an active filter intended to be used especially in portable radio apparatus. The filter (100) according to the invention is an active RC filter and it is integrated except for one or more of its capacitances or one or more of its resistances. Advantageously the highest capacitance or the highest resistance is left unintegrated. When using an external capacitance, the principle of the calibration is as follows: The integrated resistances are corrected using a common coefficient such that the external capacitance together with the integrated resistances produces the correct time constants (1). Then the integrated capacitances are corrected using a common coefficient such that they together with the internal resistances that were corrected in the previous phase produce the correct time constants (2). If the filter comprises multiple circuit stages, the two-phase calibration process described above is repeated for each circuit stage.

Abstract: A transmitter for a portable radio communication apparatus comprising a modulator having first port for inputting a baseband signal and a second port for inputting a local oscillator signal, and including means for rectifying the input local oscillator signal to provide a conductance waveform at a multiple of the local oscillator signal, and means for mixing the baseband signal with the conductance waveform at said multiple of the local oscillator signal frequency for up-converting the baseband signal to a radio frequency modulated carrier, the transmitter including means for controlling the gain of the modulator thereby to control the output level of the modulator.

Abstract: A method of searching for records in a database matching the string of ambiguous key strokes received by the input means, said database includes a plurality of records containing at least two words, and comprises reception of information representing a string of ambiguous key strokes, searching in said records for individual words matching said information representing a string of ambiguous key strokes, and presenting records found by the search engine.

Abstract: A portable device including a housing and an electro-acoustic transducer. The housing has a first surface with an outlet for the egress of an acoustic signal when in a loudspeaker mode and a second surface with an outlet for the egress of an acoustic signal when in an earpiece mode. The electro-acoustic transducer is located within the housing and converts an electrical signal input to the transducer into an acoustic signal. The transducer is operable to output acoustic signals when in the loudspeaker mode or the earpiece mode, the audio path between the transducer and the outlet for the egress of an acoustic signal when in the loudspeaker mode being less attenuated than the audio path between the transducer and the outlet for the egress of an acoustic signal when in the earpiece mode.

Abstract: A terminal for providing an application using a browser. The terminal comprises a transceiver arranged to send radio packets to and receive radio packets from a server, and means for determining if the terminal and server are able to communicate. The terminal further comprises an outbox buffer, and a browser application for displaying content stored in the server. The browser application is arranged to initiate a first application by accessing a first item associated with the first application from the server using a first content identifier. The application being provided by the combination of the first item and further items each of which is accessible using an individual content identifier, and each of which comprises content, or means for linking to content. The browser further comprising means for creating content in association with an item and means for transferring messages comprising the created content to the server.

Abstract: An apparatus is disclosed for selecting an item from a predetermined set of items. The apparatus comprises a user interface comprising an input having a plurality of actuators, and an output. It further comprises control means for controlling the user interface to provide a first menu selection comprising a plurality of items not exceeding the number of actuators, and selection means responsive to operation of the actuators for selecting the item from the menu associated with the operated actuator. The control means controls the user interface to provide a further menu selection in response to selection of an item, at least one item of the further menu selection representing a subset of the selected item.

Abstract: The present invention provides a method and a device in which two or more fingers of a RAKE receiver can locked to a multipath received signal in a situation of a fat finger impulse response. One embodiment of the present invention assigns two RAKE fingers to an impulse response so that one finger tracks the impulse response with an Early-Ontime DLL method and the other finger is tracking the impulse response with an Ontime-Late DLL method. The method comprises detecting the delay between the received signal and a delayed version, comparing the delay with a pre-determined threshold and when the delay falls below the threshold, changing the tracking method of the delayed version of the received signal to a second tracking method.

Abstract: A cordless telephone handset. The cordless telephone handset has telephone circuitry with a front side. The front side of the telephone circuitry has a top end and a bottom end. A housing is provided having a top shell and a bottom shell where the top shell and the bottom shell are disconnectable. The housing is adapted to substantially enclose the telephone circuitry when the top shell and the bottom shell are mated in a direction from the top end to the bottom end of the telephone circuitry.

Abstract: The invention relates to a method for performing cell re-selection in a cellular network, and a subscriber terminal and a network part using the method. In the method: (402) the subscriber terminal measures received powers of neighbour cells in accordance with system information received from a current cell; (406) one of the neighbour cells is selected as a new cell; (408) the subscriber terminal receives a part of the system information sent by the new cell; (408, 412) the time it takes to receive the system information of the new cell is calculated using length information in a system information part sent by the new cell.

Abstract: A method is provided for defining a pulse function shape for acting on a data stream for transmission in a telecommunication system in accordance with a predetermined modulation scheme. The method comprises defining desired cost parameters (e.g., error functions for amplitude, BER, bandwidth, energy, AFC) and defining the shape of the pulse function in dependence of the desired cost parameters. A pulse generator, modulator and communications device using such a defined device are also provided. Application in dual mode TDMA/CDMA system.

Abstract: A method and associated device wherein an inverse histogram based pixel mapping step is combined with an edge enhancement step such as unsharp masking. In such an arrangement the inverse histogram based pixel mapping step improves the performance of the unsharp masking step, serving to minimize the enhancement of noise components while desired signal components are sharpened.

Abstract: Apparatus, and an associated method, for estimating the channel phase of a communication channel upon which data is communicated. When implemented in an IS-95 cellular communication system in which 1xEV-DO technology is deployed, the channel phase estimate provided by an estimator is based upon both a pilot signal and a MAC-data signal. MAC-data bits are removed out of the MAC-data signal by a MAC bit processor, and the resultant indications are combined with indications of a pilot signal to form the channel phase estimate.

Abstract: An audio apparatus comprising a modulator 12 for modulating a first ultrasonic signal 29 with an audio signal to provide a second ultrasonic signal 30; a transducer 15 for converting the second ultrasonic signal 30 into an ultrasonic pressure wave for transmission into a non-linear medium to allow demodulation of the ultrasonic pressure wave and thereby generate an audio pressure wave representative of the audio signal 29, processing means 11 for modifying the audio signal to compensate for the demodulating properties of the non-linear medium; and means 8 for modifying the audio signal to compensate for the conversion characteristics of the transducer 15.

Abstract: A method of video encoding including: receiving a video signal to be coded; coding data representing a frame of said video signal; and repeating part, but not all, of the data. The repeated part including the picture header for the frame. A method of decoding an encoded video signal including receiving coded data representing frames of a video signal; examining the coded data to detect header data and picture data; when an error in the picture header is detected, storing the picture data in a temporary picture data store, detecting a repeat of the header data; and decoding the stored picture data using the repeated header data.

Abstract: Apparatus, and an associated method, for space-time encoding data to be communicated upon a communication channel susceptible to fading. Multi-rate data services can be effectuated through appropriate selection of the code rate by which data is encoded. And, the coding of space-time encoded data is facilitated as different permutations of coded data symbols are separate transmitted upon separate communication paths.

Abstract: Apparatus, and an associated method, facilitates recovery of the informational content of a desired component portion of a receive signal received at a radio device. Non-desired component portions of the receive signal, such as interfering components formed as a result of adjacent-band communications. Power-level zero crossings of the non-desired component portions of the receive signal are detected. The receive signal is then sampled at the times corresponding to the zero crossings of the non-desired component portions. The resultant, sampled signal formed from such sampling excludes thereby the non-desired component portion of the receive signal.

Abstract: Tiresome entry of numerous letters of the alphabet into a hand-held device for assembling a short text message for transmission via a short message service (SMS) to a second terminal is avoided by the sending of a short voice message (SVM). The SVM is recorded in the sending terminal and sent to a SVM service center (SVMSC). The SVMSC may notify the intended recipient of the arrival of the SVM and await acceptance before sending it. The second terminal may then commence a bidirectional communication so that an instant voice message session can be established. Alternatively, the problem can be overcome by converting the spoken SVM to text in the user terminal by means of voice recognition software and sending the converted text to the recipient by means of the traditional SMS infrastructure for display as text or for playback as text converted to voice.

Abstract: A system comprising at least one terminal and a server in radio communication therewith. The terminal comprises a transceiver, arranged to send radio packets to and receive radio packets from the server, and a browser application for displaying content, arranged to initiate a first application by accessing a first item associated with the first application using a first content identifier. The application is provided by the combination of the first item and further items each of which is accessible using an individual content identifier, and each of which comprises content or means for linking to content. The terminal further comprises a user interface connected to the browser having a display for displaying content and user input means. The server has a transceiver for sending and receiving radio packets from the terminal and a storage for storing content, accessible for transfer to the terminal.

Abstract: A method and system for transmitting packet data over a cellular telecommunications network is presented. A novel medium access control (MAC) logical layer is implemented between a service option layer and multiplex sublayer. The MAC layer handles the multiple accesses of packet users over selected dedicated traffic channels. The MAC layer provides a multiple access control function for packet data users only. Users requiring only circuit switched services (voice calls) are not serviced through the MAC layer multiple access control function. If a user has simultaneous circuit switched and packet data services operating, the MAC layer multiple access control function handles the packet data services, while the circuit switched services are handled simultaneously by bypassing the MAC layer multiple access control function.