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WO/1996/012345A1 |
Frequency multiplexers for the frequency-dependent fan-in of n individual signals of bandwidth (B) sampled at the frequency fa/n, which are subjected to a Fourier transform FFT, the complex output signals of which are weighted by equal-p...
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WO/1996/010871A1 |
The dual band code division multiple access radio of the present invention operates on multiple frequencies simultaneously on either transmit or receive. The transmit path operates by splitting the transmit intermediate frequency (IF) pa...
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WO/1996/006494A2 |
A multiple access communications data and information transport system and methodology for employing the noise present in any conduit as a carrier form using wireless chaotic waveform signals supported by nonlinear noise sustaining struc...
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WO/1996/002991A1 |
A discrete multitone modulation transmission system is described in which frame synchronization is monitored at the receiver by correlating frequency domain complex amplitudes of a synchronizing frame with a stored synchronizing pattern....
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WO/1996/001532A2 |
The invention relates to a unit (10) for generating signal pulses. The unit (10) comprises a first, pulsed laser (9) for supplying a pulse series having a pulse period T and a wavelength $g(1)1, and a modulation unit (13) comprising a se...
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WO/1995/028045A1 |
A physically compact, multichannel wireless communication transceiver architecture employs overlap and add or polyphase signal processing functionality, for wideband signal processing, together with a sample rate. A receiver section rece...
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WO/1995/027350A1 |
A broadband communications system for coupling telephony (10) or other digital networks to a CATV network (12). The system transmits a multiplex of telephony signals in the forward band of the CATV network. Each forward channel is QPR mo...
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WO/1995/024804A1 |
A radio having two architectural platforms integrated in one IC. A synthesizer controller (312) selects between an offset LO synthesizer (318) and a second LO synthesizer (316) to provide a common architecture for either an FDD or TDD sy...
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WO/1995/020277A1 |
A wireless communication system for simultaneously communicating overlapping wideband and narrowband signals. The system includes a transmitting station for embedding one or more narrowband signals (3-5) in a wideband signal (1) having a...
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WO/1995/019689A1 |
An optical communications network comprising a plurality of passive optical networks (PONs) connected in a ring in PON address order, in which communication channels between terminals are wavelength multiplexed. Each optical link between...
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WO/1995/019076A1 |
Methods and apparatus are disclosed for providing program selection in a packet-based communications system. A program definition (110) is generated for each program (BS1, BS2, ...BSn) that specifies which of the elementary streams carri...
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WO/1995/019078A1 |
Radiocommunication systems and methods for minimizing co-channel interference are disclosed. The systems and methods are applicable to, for example, landmobile communications (420), satellite communication systems (410) and hybrids (400)...
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WO/1995/016314A2 |
Known in a digital communication system (1) are phase recovery methods for QPSK modulated signals. It is proposed to extend such methods to multi-resolution QAM signals, which can be represented by rotationally invariant signal constella...
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WO/1995/012261A1 |
A physically compact, multichannel wireless communication transceiver architecture employs overlap and add or polyphase signal processing functionality, previously applied to narrowband speech analysis research, for wideband signal proce...
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WO/1995/012251A1 |
A computing device (100) including a wireless packet data communications modem (101) used in conjunction with a computer (103) to provide untethered access to data bases and other computer users. A method is provided for controlling data...
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WO/1995/008228A1 |
A broadband communications system having means for coupling telephony (10) or other digital networks to a CTV network (12). The system includes transmitting a multiplex of telephony signals in 3 MHz channels in the forward band of the CT...
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WO/1995/007576A2 |
A method and apparatus for transmitting digital sound are disclosed. The method contemplates transmitting a digital radio signal (such as an FM band signal) over a plurality of sub-channels subject to some constraints on the digital sign...
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WO/1995/006364A1 |
A selective call base station (100) for receiving a signal comprising a plurality of communication signals has an Analog-to-Digital (A/D) converter (220) for digitizing the signal. A memory (204) for storing the signal as a plurality of ...
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WO/1994/028637A1 |
A receiver that receives (203) a stream of information symbols (101) may detect that usability of the stream of information symbols received as follows. Upon receiving the stream of information symbols (101), the receiver (203) separates...
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WO/1994/024772A1 |
A method and apparatus are provided for separating spectrally diverse radio frequency signals. The apparatus includes means, within a signal transfer module (23), for transferring an input signal received at a first port of the signal tr...
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WO/1994/021061A1 |
An apparatus is provided for use in a multi-channel digital transmitter and receiver. A filtering process is accomplished by conditioning portions of a digitized signal during digital signal processing by integrating, taking the differen...
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WO/1994/017610A1 |
A microwave multiplexer includes a first channel segment (8) having first components (Ai, Bi, Ci, Ji) derived from a first log-periodically scaled prototype. The first channel segment (8) receives a composite signal from a composite-sign...
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WO/1994/015418A1 |
Communication between tasks within repeaters (100, 109, 111) of a communication system (119) can be improved in the following manner. Each repeater (100, 109, 111) determines its repeater configuration (200) which includes identifying an...
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WO/1994/011981A1 |
A system and device is provided that enhances the interactivity of multimedia information across a communications network or in combination with other networks including telecommunication and cable broadcasting. The system includes a plu...
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WO/1994/011961A1 |
The invention relates to a method and an arrangement for dynamic allocation of multiple carrier wave channels for multiple access by frequency division multiplexing. The invention provides a number of mobile units with the possibility of...
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WO/1994/006231A1 |
A frequency-division-multiplex transmitter for carrying an OFDM signal on a large number of closely-spaced carriers receives the digital data at an input (12), applies coding such as convolutional coding (14), time interleaves (16) the s...
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WO/1993/017510A1 |
An improved echo cancelling device (18) for reducing the effects of acoustic feedback between a loudspeaker and microphone in a communication system. The device includes an adjustable filter (50) for receiving a loudspeaker signal and ge...
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WO/1993/014597A1 |
A multichannel television access control system is disclosed wherein processing of the broadbande signal is performed by gated coherent RF injection on a plurality of channels, thereby effecting selective descrambling of an arbitrary sub...
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WO/1993/014585A1 |
A bidirectional radio system for low cost, high through-put accumulation of data from a large number of site units. The site units are connected to remote radio transceivers in radio communication with a plurality of base stations (44). ...
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WO/1993/009617A1 |
In a digital communication system in which pulse-shape filtered sync (202), pilot (203), and data symbols (201), arranged in successive time slots, modulate sub-channel carriers (309) via sub-channel mixers (308) to form sub-channel symb...
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WO/1993/009622A1 |
A quad 16 QAM transmission (132-136) and reception (600) methodology wherein a time domain pilot reference is advantageously associated therewith. There may be one or more such pilot references for each packet of multiple 16 QAM pulses (...
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WO/1993/009493A1 |
A method to encode two digital signals (USC-B, UBC-B) is disclosed. Each of the digital signals is characterized by a bit stream. An N bit block from the first signal is mapped to a unique M bit third signal where M is greater than N. Fu...
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WO/1993/008651A1 |
A process is disclosed for reducing frequency interlacing during transmission of digitized audio signals. Frequency interlacing is always to be expected when the input signal is distributed among partial bands in series connected stages....
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WO/1993/001660A1 |
A power distribution line communication system for, and method of, reducing effects of signal cancellation at locations along the distribution line (2) due to standing waves caused by reflections of a carrier signal impressed on the dist...
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WO/1992/021195A1 |
A dual-mode transmitter having an antenna (109), a mode controller (103), a source encoder, a tunable-frequency synthesizer (105), a chip-code generator (107), a spread-spectrum modulator (111), a narrowband modulator (113), a power ampl...
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WO/1992/010039A1 |
The invention relates to a process for filtering out the lower or upper sideband of a double-sideband oscillation to be assessed from a mixture of several double-sideband oscillations, the upper and/or lower sideband of which suffers int...
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WO/1991/017617A1 |
A speech-transmission system with a multiplicity of speech stations for multi-channel transmission over one or a few lines can be produced, in the form of integrated circuits, by means of synchronized speech stations (1), which have a di...
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WO/1991/015925A1 |
A low power OFDM signal may be transmitted in an environment where it is subject to interference from other transmissions, e.g. broadcast television services. In a receiver interference is reduced by ignoring information modulating OFDM ...
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WO/1991/015065A1 |
A method of transferring a data message from a remote unit (120) to a central location (110) is provided. A plurality of data channels is selected for transmitting the data message from the remote unit (120) to the central (110) location...
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WO/1991/008631A1 |
A plurality of radio frequency channels are separated into two or more contiguous groups of channels, each of such groups occupying less than one octave. A first group of channels occupies a 54 MHz to 106 MHz band, a second band of chann...
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WO/1990/011675A2 |
A communication system has an information signal having a plurality of data streams (72, 77, 92). The data streams are simultaneously modulated on a multi-level symbol transmission (110). The data streams may have either independent or d...
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WO/1990/002445A1 |
A signal receiving system (10) for receiving messages from each of several unequal amplitude FM carriers (vi(t)) occupying the same portion of the frequency band. The capture effect associated with conventional frequency demodulators is ...
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WO/1989/011186A1 |
An intercom system for use in combination with a multi-line telephone system wherein the intercom system utilizes the same wire pair for communications between intercom units that is used for normal telephone communications. The intercom...
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WO/1989/005071A1 |
Apparatus for converting a frequency division multiplex (fdm) signal to a time domain multiplex (tdm) signal in which a voltage controlled oscillator (21) whose output is a staircase of reference frequencies mixed by a mixer (20) with a ...
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WO/1988/008648A1 |
Disclosed is a method to dynamically allocate a number of data channels on a trunked radio system (100). The data activity is monitored during a predetermined time interval. If activity is above a predetermined maximum, an additional cha...
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WO/1988/000417A2 |
A digital broadcasting process, suitable for digital audiobroadcast, comprises encoding the data in the form of binary words using a redundant code to obtain a sequence of modulation symbols and transmitting the symbols in a plurality of...
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WO/1987/004883A1 |
A spread-spectrum transmission system wherein a plurality of spread-spectrum signals are frequency division multiplexed by offsetting the centre or carrier frequencies of the spread-spectrum signals by a fraction of the spectral-line spa...
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WO/1987/002141A1 |
A broadband receiver for converting an input radio frequency signal (36) into output pulses (50) includes provision for expanding the width of the output pulses (50) to permit pulse processing by conventional equipment at slower processi...
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WO/1987/001542A1 |
A private telephone line expander which receives two analog voice inputs (XMIT A and XMIT B). Both input signals are digitized (75) compressed using full period splicing (40), and converted back to analog for transmission (90). One is sh...
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WO/1986/007223A1 |
A high speed modem (26) that transmits and receives digital data on an ensemble of carrier frequencies spanning the usable band of a dial-up telephone line (48). The modem includes a system (30, 32, 34, 36, 40, 43, 44) for variably alloc...
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