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WO/1998/009383A1 |
A method and apparatus for processing an input signal for transmission and/or storage, uses an analysis filter bank (21; 51) to decompose the signal into sub-band signals which are used to modulate a plurality of carriers. The carriers a...
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WO/1998/009348A1 |
The invention relates to a summing member (4) comprising in-connectors for receiving and combining different RF signals and an out-connector for supplying the combined signals further, at least one of the connectors (10) being coaxial an...
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WO/1998/005138A2 |
A test system for evaluating the operating state of a headend of a broadband communications network for communicating telephony signals between a telephony system and subscribers of communications services. Modulators at the headend tran...
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WO/1998/005117A1 |
A communication system (100) employs a method and apparatus for mitigating distortion effects and enhancing signal usability determinations in a receiver (102). The receiver receives a discrete information signal that includes a stream o...
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WO/1998/001969A1 |
The invention concerns a digital signal processing system for transmission of digital FDM signals with at least two FDM circuits (3, 5) to each of which of plurality of channels is directed and each of which produces an FDM signal which ...
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WO/1998/000953A1 |
Multiple carrier transmission systems such as used for Digital Audio Broadcasting (DAB) typically require significant complexity in the implementation of the receiver. This is usually done using an FFT (fast fourier transformation) on th...
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WO/1997/049209A1 |
A mechanism that dynamically adjusts the number of packets (164) sent in the train (160) from a node (103) to reflect the rate of packets arriving at the node (103). A train (160) is a group of packets (150) that are sent from the node (...
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WO/1997/048206A1 |
The invention concerns a method and apparatus for implementing a wireline transmission connection, especially a VDSL transmission connection. The transmission connection is implemented in electric form so that a separate frequency range ...
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WO/1997/045966A1 |
The invention relates to a method and apparatus for channel hopping between mobile stations (MS1-MS3) and a base station (BS1) in a radio communications system. A channel allocation means (211) within the base station (BS1) generates cha...
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WO/1997/041647A1 |
The invention relates to a novel code division multiple access, code multiplex (CDMA) system structure which is identical to the structure of a CDMA system operating with direct code spread (DS, direct sequence) but which operates by a m...
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WO/1997/040586A1 |
A method and apparatus for initializing a radio transmission apparatus comprising a voltage control oscillator, a phase lock loop, and a power amplifier is disclosed so as to avoid generating unwanted interference in neighboring radio ch...
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WO/1997/037454A1 |
The apparatus (101) and method for spectrum management in a multipoint communication system controls upstream channel usage for secondary stations (110) transmitting information to a primary station (101) and downstream channel usage for...
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WO/1997/037455A1 |
A method for assigning communication resources includes assigning communication resources (216, 218, 220) in the nature of bandwidth according to various selection schemes based upon the type of communication service being provided, and ...
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WO/1997/036384A1 |
The aim is to allow a flexible allocation of transmission capacities without interrupting or disrupting existing radio links. This is done as follows: a control device (SE) is provided to adjust one or more transmission parameters in the...
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WO/1997/036433A1 |
The aim is to facilitate a flexible allocation of transmission capacities in a point-multipoint radio transmission system without interrupting or disrupting existing links. This is done as follows: a control device (SE) is provided to ad...
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WO/1997/033385A1 |
To avoid complex synchronization for locally concentrated, asynchronous, wireless telecommunications systems, a free, not yet occupied FDMA frequency is occupied with priority in each telecommunications system for a first telecommunicati...
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WO/1997/032413A1 |
A multiple access communications system and method using Code Division Multiple Access (CDMA) and Time Division Multiple Access (TDMA) comprises coding information signals with CDMA codewords to be transmitted over a common frequency spe...
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WO/1997/032412A1 |
Apparatuses and methods for practising subtractive multi-carrier CDMA techniques are disclosed. A channel is divided into a plurality of contiguous subchannels, wherein in each subchannel an amount of spreading is reduced in accordance w...
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WO/1997/029568A1 |
A transmitter-receiver system and a method for transmitting and receiving MCM signals, whereby any frequency offset and timing mismatch can be determined and corrected simultaneously, prior to demodulating the received signal. A pluralit...
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WO/1997/028610A1 |
In a cellular-telephone-system base-station receiver's channelizer (111), frequency translation of the outputs of a filter bank (fig. 5) implemented in fast-Fourier-transform circuitry (453, 455, 460) is achieved by rotating the correspo...
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WO/1997/028611A1 |
In a fiber-to-the-curb telecommunications system a method of network synchronization is presented in which data is transmitted from a broadband network unit (240) to devices in a residence (290) on a downstream carrier frequency, where t...
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WO/1997/023070A1 |
A frequency division multiplexed coupler (401) for multiplexing a plurality of signals onto a single telephone wire (636) is disclosed. The frequency division multiplexed coupler (401) comprises a first modulating unit (621) for modulati...
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WO/1997/022189A1 |
A satellite direct audio broadcast system includes a plurality of fixed-rate, uniform, frequency division multiple access ("FDMA") uplinks (21) and a time division multiplexed ("TDM") downlink (27). Source audio channels may be divided a...
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WO/1997/019532A1 |
Carriers (51) in a communication system (10) are prioritized (70) according to their usability. A local access manager (LAM) (27) creates a frequency list that ranks the carriers (51) based upon their frequency. When a cable fixed access...
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WO/1997/015121A2 |
The invention concerns a method used for terrestrially transmitting at least one digital signal, in particular a digital radio and/or television broadcasting signal. According to this method, the at least one digital signal, whose data v...
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WO/1997/013350A1 |
Multiple carriers are generated, modulated by data to be transmitted, as shown by oscillators (2-5) and modulators (21, 22, 31, 32, etc.) (or using Fourier transform techniques). They follow two paths. One path via adder (81) takes a set...
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WO/1997/011539A2 |
The invention relates to a method used for common transmission of digital and analogue modulated radio broadcasting and/or television broadcasting signals, in particular on a broadband cable system. The method provides for at least one d...
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WO/1997/009838A1 |
A method and apparatus for frequency planning in a multi-system (A, B, C) cellular communications network is disclosed in which a plurality of systems operate over a frequency range comprising a plurality of frequency bands. The systems ...
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WO/1997/007606A1 |
A method and apparatus are provided for dynamically allocated multiple slots within a multi-channel multi-carrier transmission system (60). The slots may be allocated sequentially or non-sequentially. The data transmission rate for each ...
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WO/1997/006618A2 |
A filter fast Fourier transmultiplexer (216) divides a multi-channel communication signal into single channel communication signals through a cascade of filters (304, 314, 348, 354, 360, 366, 404-418) and mixers (604-610). The output sam...
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WO/1997/004572A1 |
A method and system for data transmission in an orthogonal frequency division multiplexed (OFDM) system is provided. In the invention each of a plurality of data symbols Ck, having a symbol period T, are modulated (404) onto one of a plu...
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WO/1997/002673A1 |
A multi-channel modulator for the transmission of telephony signals within a broadband communication system. A filter accepts digitized data streams of telephony information in the form of I and Q signal components, and filters them to p...
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WO/1996/041452A1 |
A broadband communications system for coupling telephony or other digital networks to a CATV network. The system transmits a multiplex of telephony signals in the forward band of the CATV network. The forward telephony channels are demod...
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WO/1996/037981A1 |
A single transducer digital communication receiver is described which is capable of extracting the data bits of at least one desired signal in the presence of interfering signals of similar type. The present invention also seeks to provi...
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WO/1996/036132A1 |
The invention relates to a method and equipment for multirate coding and detection in a multiple access mobile communication system. A transmitter selects (34) a data transfer rate, and codes (38, 39) the transfer rate information to a t...
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WO/1996/035271A1 |
Frequency spectrum management provides for dynamic spectrum usage adjustment among applications on a shared medium. Dynamic resource management methods are applied to the problem of managing spectrum and matching application specific req...
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WO/1996/034459A2 |
Known is an optical receiver (4) in which first a received broadband optical signal is converted to a broadband electric signal by means of an optoelectric converter (49) comprising a transimpedance amplifier, and thereafter a channel is...
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WO/1996/034349A1 |
An airdisk (80) performs a TDMA/FDMA (Time Division Multiple Access/Frequency Division Multiple Access) wireless broadcast, divided into periodically-repeated time-slotted data items, analogous to sectors on a rotating disk, over multipl...
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WO/1996/026578A1 |
Methods and systems for processing signals in radio communication systems are described which include processes for handling co-channel interference while reducing the number of Viterbi states being processed. A spatial analogy to the Vi...
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WO/1996/024205A1 |
A transmitter includes a combiner (102) for combining plural data signal sets (I1, Q1; I2, Q2) into a single set of data signals (I', Q'). An I/Q modulator (106) modulates the single sets of data signals onto for example an intermediate ...
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WO/1996/021292A1 |
A wideband frequency digitizer (10) and method for digitizing multiple bands of a wideband frequency signal. The digitizer (10) and method providing for optimally positioning a segment (402) of the wideband frequency signal within a Nyqu...
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WO/1996/021305A1 |
A digital receiver (200) and a transmitter (300), wherein the digital receiver includes a plurality of antennas (202) for receiving uplink radio frequency signals; a plurality of analog to digital converters (210) for converting the rece...
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WO/1996/019875A1 |
A bidirectional radio system for low cost high throughput accumulation of data from a large number of sites units (50). Frequency synchronisation is achieved at low cost by transmitting a hig accuracy carrier and clock signal at a base s...
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WO/1996/019873A1 |
A communication system (100) that includes a base unit (101) and a subscriber unit (e.g., 103) employs a method (400) and apparatus (101) for mitigating interference (135) therein. The base unit (101) receives an uplink communication sig...
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WO/1996/019883A1 |
A modulator system for generating a plurality of individual modulated RF signals (Subband 1-Subband 7) and combining (13) them and transmitting them in different frequency channels. The invention provides a practical method and apparatus...
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WO/1996/018249A1 |
Modulated signals inputted through terminals 111-11n are converted in frequency into signals of mutually different frequency bands by means of frequency converting means 121-12n. The converted signals are supplied to a power combining me...
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WO/1996/017431A1 |
An integrated circuit chip set in a radio communication system is provided, wherein the modulation of the signals is either QPSK or FSK and the signal transmission and reception is by either TDD or FDD. The chip set includes an IF integr...
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WO/1996/017446A1 |
The invention relates to a receiver and a data transmission method in a system wherein the CDMA multiple access method is utilized and wherein each data signal (30) to be transmitted is multiplied by a pseudorandom code (40) of a certain...
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WO/1996/015600A1 |
A method of allocating communication resources in a communication system includes retrieving (404) from the communication system a communication system resource allocation. An allocation parameter is set to an initial value (406) and com...
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WO/1996/013131A1 |
Two separate subcarriers (16, 22) are used to transmit portions of a single message to one or more receivers on an FM radio signal. The synchronization and addressing data necessary to identify the message to a target receiver is located...
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