The invention relate to a system for transmitting time-critical analog signals and/or digital signals between a first device (12) and a second device (14). The system (10) comprises at least a first protocol converter (18) connected to the first device (12) and at least a second protocol converter (20) connected to the second device (14). A data transmission network (26) for transmission of data packets is provided between the protocol converters (18, 20). The data transmission network (26) is established by an internet protocol network. The system (10) comprises a port redirector (28, 29) associated with at least one of the protocol converters (18, 20). The port redirector (28, 29) is configured to convert a protocol for serial data transfer into the transmission control protocol, thereby generating the data packets, or to convert the transmission control protocol associated with the data packets into a protocol for serial data transfer. The system (10) is configured to process asynchronous data and synchronous data. Further, a method of transmitting time- critical analog signals and/or digital signals is provided.
A direction finding system is provided. It serves the purpose of finding a direction of an electromagnetic signal. The direction finding system comprises an antenna system for receiving the electromagnetic signal and a direction finder for determining the direction of the electromagnetic signal. The direction finder comprises a direction determiner, adapted to determine a number of possible directions, and a direction evaluator, adapted to evaluate the possible directions and determine the direction of the electromagnetic signal therefrom.
A system (10) for processing an electromagnetic signal is described, wherein the system (10) comprises a transmission path (16) with limited dynamic range and a pre-selection unit (22) that is positioned upstream the transmission path (16). The pre-selection unit (22) is configured to pre-select signal portions and to control the level of the output electromagnetic signal. Further, a method for processing an electromagnetic signal is described.
The present application is related to a method for detection of a signal, the method comprising the steps of performing continuously a direction finding in time-frequency intervals within a time range and a frequency range, determining for each frequency interval a distribution of the direction finding results, DFRs, for all time intervals and evaluating the determined distribution of direction finding results, DFRs, to detect the existence of a signal emitted by a signal source.
G01S 3/00 - Radiogoniomètres pour déterminer la direction d'où proviennent des ondes infrasonores, sonores, ultrasonores ou électromagnétiques ou des émissions de particules sans caractéristiques de direction
G01S 3/14 - Systèmes pour déterminer une direction ou une déviation par rapport à une direction prédéterminée
5.
DEVICES FOR THE AUTOMATIC ADJUSTMENT OF GAIN AND/OR ATTENUATION FACTOR
A device for the automatic adjustment of a gain and/or attenuation factor (G;ATT) of several amplification or attenuation elements (1;2;3) connected in a cascade comprises respectively a detector (8;9;10) for measuring a signal level of a signal disposed at the input of the respective amplification or attenuation element (1;2;3) and respectively a downstream control unit (14;14';14") for determining the gain and/or attenuation factor (G;ATT) respectively associated with each amplification or attenuation element (1;2;3). The control unit (14;14';14") is a forward control unit for determining the gain and/or attenuation factor (G;ATT) respectively associated with each amplification or attenuation element (1;2;3) dependent exclusively upon the measured signal level of the signal disposed at the input of each amplification or attenuation element (1;2;3).
A device for detecting an estimated value ( â k ) for a symbol ( a k ) at a given time ( k ), which is supplied to a phase modulation and transmitted via a transmission channel with a time-variable phase ( .theta. k ), provides a unit (1) for determining log weighting factors in a forward recursion, a unit (3) for determining complex coefficients in a forward recursion, a unit (4) for determining log weighting factors in a backward recursion, a unit (5) for determining complex coefficients in a backward recursion, a unit (7) for determining an extrinsic information, a unit (2) for determining the phase factor with the maximal weighting factor in a forward recursion and a unit (6) for determining the phase factor with the maximal weighting factor in a backward recursion.
A device for fixing a gain or attenuation factor (G;ATT) for a gain or attenuation element (1) during a transmission of a sequence of synchronisation-data symbols registers the signal level (S1) of a received signal at the input of the gain or attenuation element (1). It then identifies the start of transmission (t2) of the sequence of synchronisation-data symbols on the basis of the signal level (S1) of the registered, received signal and signals the time interval for the fixing of the gain or attenuation factor (G;ATT) starting with the identified start of transmission (t2) of the sequence of synchronisation-data symbols.
An authentication-encryption unit (6) provides at least one encryption element (30 1 to 30n), wherein each encryption element (30 1 to 30n) encrypts a plain-data block (34 1 to 34n) and accordingly generates a cipher-data block (35 1 to 35n). A common checksum (15 1) is calculated over each cipher-data block (35 1 to 35n). According to the invention, it is possible to select via a selection unit (52 1 to 52n) in each encryption element (30 1 to 30n) which data bits in each cipher-data block (35 1 to 35n) are to be used to calculate the common checksum (15 1).
H04L 9/06 - Dispositions pour les communications secrètes ou protégées; Protocoles réseaux de sécurité l'appareil de chiffrement utilisant des registres à décalage ou des mémoires pour le codage par blocs, p.ex. système DES
H04L 9/32 - Dispositions pour les communications secrètes ou protégées; Protocoles réseaux de sécurité comprenant des moyens pour vérifier l'identité ou l'autorisation d'un utilisateur du système
9.
A SYSTEMATIC ENCODER WITH ARBITRARY PARITY POSITIONS
An encoder structure for an error correcting code with arbitrary parity positions is presented. The invention is effective for all error correcting codes whose parity check matrix is of the Vandermonde type. In contrast to conventional encoder circuits, the parity symbols produced by this encoder are not restricted to form a block of consecutive parity symbols at the begin-ning or at the end of a codeword, but may be spread arbitrarily within the codeword. A gen-eral structure of the parity check matrix for such a code is found by exploiting the special Vandermonde structure of matrices. From this general parity check matrix, an expression for the evaluation of the parity symbols in terms of a polynomial with limited degree is derived. An efficient hardware implementation of the proposed encoder is suggested.
H03M 13/11 - Détection d'erreurs ou correction d'erreurs transmises par redondance dans la représentation des données, c.à d. mots de code contenant plus de chiffres que les mots source utilisant un codage par blocs, c.à d. un nombre prédéterminé de bits de contrôle ajouté à un nombre prédéterminé de bits d'information utilisant plusieurs bits de parité
H03M 13/27 - Codage, décodage ou conversion de code pour détecter ou corriger des erreurs; Hypothèses de base sur la théorie du codage; Limites de codage; Méthodes d'évaluation de la probabilité d'erreur; Modèles de canaux; Simulation ou test des codes utilisant des techniques d'entrelaçage
10.
METHOD AND SYSTEM FOR SYNCHRONIZED MAPPING OF DATA PACKETS IN AN ATSC DATA STREAM
Mapping data packets of a first data stream into data fields of a second data stream at several transmitters is provided by generating a first data stream with first data packets containing data associated with stationary receivers and second data packets contain-ing data associated with mobile receivers in a head-end, where second data packets at the start of a group of consecutively transmitted second data packets contain placeholders into which signaling informa-tion is filled. A first data stream is transmitted from the head-end to each transmitter. Each transmitter extracts signaling information from the second data packets indicating in which data slot and in which data sub-frame of a received data frame the second data packet is transferred. Each transmitter inserts synchronization data in a specific data packet in each data slot containing second data packets. The first and second data packets are mapped consecutively into the second data stream.
H04H 20/06 - Dispositions pour la retransmission des informations radiodiffusées entre des stations de radiodiffusion
H04H 20/18 - Dispositions de synchronisation de la radiodiffusion ou de la distribution par l'intermédiaire de plusieurs systèmes
H04H 20/67 - Systèmes à ondes communes, c.-à-d. utilisant des émetteurs séparés fonctionnant sensiblement à la même fréquence
H04H 60/04 - Dispositions pour la production d'informations radiodiffusées; Dispositions pour la production d'informations relatives à la radiodiffusion en liaison directe avec les informations radiodiffusées ou le créneau spatio-temporel de radiodiffusion; Dispositions pour la production simultanée d'informations radiodiffusées et d'informations relatives à la radiodiffusion Équipement de studio; Interconnexion des studios
H04W 4/06 - Répartition sélective de services de diffusion, p.ex. service de diffusion/multidiffusion multimédia; Services à des groupes d’utilisateurs; Services d’appel sélectif unidirectionnel
H04L 27/02 - Systèmes à courant porteur à modulation d'amplitude, p.ex. utilisant la manipulation par tout ou rien; Modulation à bande latérale unique ou à bande résiduelle
H04N 7/24 - Systèmes pour la transmission de signaux de télévision utilisant la modulation par impulsions codées
11.
A METHOD AND A DEVICE FOR TESTING A MOBILE-RADIO DEVICE BY MEANS OF STATIC CHANNEL SIMULATION
The invention relates to a device and to a method for testing a mobile radio device (30) in a multiple antenna sys-tem (23, 24, 31, 32) using a frequency-selective static channel model for channel simulation in frequency space. In the method ac-cording to the invention, the useful data to be transmitted are first allocated to a plurality of carrier frequencies and the associated coding parameters per antenna. The useful data are then modulated onto the carrier frequencies according to the allocation. One or more modulated carrier signals are now distorted in frequency space according to a frequency-selective static channel model. A transmission signal composed of the channel-modeled modulated carrier signals is subsequently transmitted in the period of time to a mobile radio device to be tested.
Producing coherent symbols from a plurality of digital RF transmitters is achieved by selecting data bytes correspond-ing to mobile-handheld encapsulation (MHE) packets and setting trellis coders to a predetermined state when a predetermined number of bits of the data bytes enter a cor-responding trellis coder.
H04L 1/00 - Dispositions pour détecter ou empêcher les erreurs dans l'information reçue
H04H 20/67 - Systèmes à ondes communes, c.-à-d. utilisant des émetteurs séparés fonctionnant sensiblement à la même fréquence
H04W 4/06 - Répartition sélective de services de diffusion, p.ex. service de diffusion/multidiffusion multimédia; Services à des groupes d’utilisateurs; Services d’appel sélectif unidirectionnel
H04L 27/02 - Systèmes à courant porteur à modulation d'amplitude, p.ex. utilisant la manipulation par tout ou rien; Modulation à bande latérale unique ou à bande résiduelle
H04N 7/24 - Systèmes pour la transmission de signaux de télévision utilisant la modulation par impulsions codées
13.
EVALUATION OF THE FEEDBACK QUALITY IN COMMUNICATIONS SYSTEMS
A measuring system for testing a feedback signal quality, transmitted by a communications device within a communications system, is provided. This measuring system includes a measuring device which transmits a signal to the communications device. The signal is received by the communications device and a feedback signal is generated by the communications device indicating the transmission conditions of the signal. The measuring device then measures actual reception quality of the signal in the communications device and compares the measured transmission quality with the feedback signal.
A method for transmission of first data (1_Daten1, 1_Daten2, ..., 1_Daten n) between a central radio station (1) and at least one transmitter (31, 32, 33,..., 3N-2, 3N-1, 3N) transmits the first data (1_Daten1, 1_Daten2, ..., 1_Daten n) in first data fields (7) of data packets (5) and useful data in second data fields (8) between the central radio station (1) and a plurality of receivers (4 1, 4 2, 4 3,..., 4M-1, 4M) associated with radio subscribers via each of the transmitters (3 1, 3 2, 3 3,..., 3N-2, 3N-1, 3N). The first data fields (7) in this context are pre-reserved by the central radio station (1) for the transmission of second data (2_Daten1, 2_Daten2,..., 2 Daten n) between the transmitter (s) (3 1, 3 2, 3 3,..., 3N2, 3N-1, 3N) and the receivers (4 1, 4 2, 4 3, ..., 4M-1, 4M).
H04N 21/23 - Traitement de contenu ou de données additionnelles; Opérations élémentaires de serveur; Intergiciel de serveur
H04B 7/00 - Systèmes de transmission radio, c. à d. utilisant un champ de rayonnement
H04N 7/035 - Circuits pour les données numériques autres que des données d'image, p.ex. pour le découpage du signal de données, pour la régénération du signal d'horloge de données, pour la détection ou la correction d'erreurs du signal de données
15.
METHOD AND DEVICE FOR DECODING CONVOLUTION-ENCODED SIGNALS
The device is used for decoding convolution-encoded reception symbols (50). In this context, transmission data are modulated with a modulation scheme to form symbols, which are encoded with a transmission filter to form convolution-encoded transmission symbols. A convolution-encoded transmission symbol contains components of several symbols arranged in time succession. These transmission symbols are transmitted via a transmission channel and received as reception symbols (50). The Viterbi decoder (81) decodes the reception symbols (50) by means of a modified Viterbi algorithm. Before running through the Viterbi decoder (81), the reception symbols (50) are processed by a state-reduction device (80), which determines additional items of information relating to possible consequential states of the decoding independently of the decoding through the Viterbi decoder (81) in every state of the decoding. The state-reduction device (80) uses the additional items of information to restrict the decoding through the Viterbi decoder (81) to given consequential states.
H04L 25/03 - Réseaux de mise en forme pour émetteur ou récepteur, p.ex. réseaux de mise en forme adaptatifs
H03M 13/41 - Estimation de séquence, c.à d. utilisant des méthodes statistiques pour la reconstitution des codes originaux utilisant l'algorithme de Viterbi ou des processeurs de Viterbi
16.
SYSTEMS, APPARATUS, METHODS AND COMPUTER PROGRAM PRODUCTS FOR PROVIDING ATSC INTEROPERABILITY
Systems, apparatus, methods and computer program products are provided for causing a dataframe to be emitted at an air interface of an antenna. A memory stores a transmission to antenna delay value (TAD). An offset calculator calculates an offset value based on an epoch of a global timebase generator and the transmission to antenna delay value (TAD). An interface controller in communication with the offset calculator communicates a segment synchronization signal and a field synchronization signal based on the offset value.
According to the invention, the measurement method presented and the measuring device presented allow inferences to be gained regarding the status and the quality of mobile telephone user equipment by correlating operating parameters with the transmission power of a mobile telephone transmitter and the Transport Format Combination Indicator (TFCI).
The invention regards a system, a mobile communication unit (3) and a method for analysing a receiver (8) performance of a mobile communication unit (3). An information is generated in a system simulator (4) and is transmitted in a transmission signal from a testing device (2) to a mobile communication unit (3) under test. The transmission signal is transmitted from the testing device (2) to the mobile communication unit (3) under test via a unidirectional channel (6, 7). The transmission signal is received and analyzed by the receiver (8) the performance of which is to be tested. By analyzing the received transmission signal the information included in the transmission signal is being obtained. The information obtained from the analysis of the transmission signal is transmitted back from the mobile communication unit (3) under test in a backtransmission signal via an independent backtransmission channel (14). The backtransmission signal received by the testing device (2) is analysed by the testing device (2) for obtaining the information included in the backtransmission signal and the result is compared to the information originally generated.
The invention relates to a signal conditioning circuit with a digital/analog converter (1), an I/Q modulator (2) and at least one mixer (3, 4). According to the invention, instead of a multiplicity of oscillators for the individual stages (21-24), a single oscillator (16) is used. The total noise of the stages (21-24) is decreased by the resulting correlation.
Systems, methods, apparatus are provided for providing to a receiver a time diverse digital signal corresponding to a service including receiving a digital signal containing a service content and receiving a digital signal containing a non- deterministic content. The service content is inserted into a first predetermined number of data packets in a first predetermined number of data frames deterministically. In addition, a first portion of the non- deterministic content is inserted into a second predetermined number of data packets in the first predetermined number of data frames. A copy of the first predetermined number of data packets is generated. The first predetermined number of data frames is broadcast over a distribution network. The copy of the first predetermined number of data packets is inserted into a second predetermined number of data frames and a second portion of the non- deterministic content is inserted into the second predetermined number of data frames. The second predetermined number of data frames is broadcast after a predetermined time.
H03K 9/00 - Démodulation d'impulsions qui ont été modulées par un signal à variation continue
H04L 7/00 - Dispositions pour synchroniser le récepteur avec l'émetteur
21.
METHOD AND SYSTEM FOR DETERMINING THE AMPLITUDE AND/OR PHASE OF THE OUTPUT SIGNAL FOR A TRANSMISSION BODY DEPENDING ON THE AMPLITUDE OF THE INPUT SIGNAL
A system for determining the amplitude and/or the phase of the output signal of a transmission link dependent upon the amplitude of the input signal (AM-AM and/or AM-PM characteristic) impresses a test signal (s(t)) on the transmission link, measures the response signal (e(t)) resulting from the test signal (s(t)) by amplitude and/or phase distortion in the transmission link and determines the amplitude response (le(t)l) of the response signal (e(t)) and/or the phase responses (.PHI.s(t), (.PHI.E(t)) of the test signal (s(t)) and of the response signal (e(t)) dependent upon the amplitude response (¦s(t)¦) of the test signal (s(t)). The system can contain a unit for subordinate procedural control, which is connected to the transmission unit and to the measuring device and determines the AM-AM and/or AM-PM characteristic of the transmission link from the phase and/or amplitude response of the test signal and the response signal.
H04B 17/18 - Surveillance en fonctionnement normal
H04B 17/17 - Détection de contre-performance ou d’exécution défectueuse, p.ex. déviations de réponse
G01R 27/28 - Mesure de l'atténuation, du gain, du déphasage ou des caractéristiques qui en dérivent dans des réseaux électriques quadripoles, c. à d. des réseaux à double entrée; Mesure d'une réponse transitoire
G01R 29/06 - Mesure de la profondeur de modulation
H03F 1/32 - Modifications des amplificateurs pour réduire la distorsion non linéaire
H03F 3/20 - Amplificateurs de puissance, p.ex. amplificateurs de classe B, amplificateur de classe C
22.
METHOD AND SYSTEM FOR DETERMINING THE AMPLITUDE AND/OR PHASE OF THE OUTPUT SIGNAL OF A TRANSMISSION LINK DEPENDENT UPON THE AMPLITUDE OF THE INPUT SIGNAL
A method and a system for determining the amplitude and/or the phase of the output signal of a transmission link dependent upon the amplitude of the input signal (AM-AM and/or AM-PM characteristic) impresses a test signal (s(t)) on the transmission link (14), measures the response signal (e(t)) resulting from the test signal (s(t)) by amplitude and/or phase distortion in the transmission link (14) and determines the amplitude response (|e(t)|) of the response signal (e(t)) and/or the phase responses (.phi.s(t), (.phi.E(t)) of the test signal (s(t)) and of the response signal (e(t)) dependent upon the amplitude response (|s(t)|) of the test signal (s(t)). The amplitude response (|s(t)|) of the test signal (s(t)) consists of several first and second response segments with constant amplitude values over the duration (.DELTA.T) of the respective first or second response segment.
H04B 17/13 - Surveillance; Tests d’émetteurs pour l’étalonnage d’amplificateurs de puissance, p.ex. de gain ou de non-linéarité
G01R 27/28 - Mesure de l'atténuation, du gain, du déphasage ou des caractéristiques qui en dérivent dans des réseaux électriques quadripoles, c. à d. des réseaux à double entrée; Mesure d'une réponse transitoire
G01R 29/06 - Mesure de la profondeur de modulation
H03F 1/32 - Modifications des amplificateurs pour réduire la distorsion non linéaire
23.
APPARATUS, SYSTEMS AND METHODS FOR PROVIDING ENHANCEMENTS TO ATSC NETWORKS USING SYNCHRONOUS VESTIGIAL SIDEBAND (VSB) FRAME SLICING
Systems, methods, apparatus and computer program products are provided for signaling to a receiver an availability of a service and a deterministic mapping of a service content corresponding to the service. A modulator receives a digital signal and generates a data frame from the digital signal, where the data frame is divided into segments, where at least one grouping of the segments contains the service content. The modulator modulates at least one grouping in accordance with the deterministic mapping. A receiving device receives a digital signal containing the availability of a service, the deterministic mapping corresponding to the service, and the service content, and performs an operation on the service content in accordance with the deterministic mapping.
A system, method, apparatus and computer code are provided for producing coherent symbols from digital RF transmitters. A multiplexer receives a digital signal containing content data to be broadcast from the digital RF transmitters and inserts a first initialization packet into the digital signal, where the initialization packets implicit position in the digital signal will signal data framing in the digital RF transmitters. Where the initialization packet contains stuff bytes for deterministically initializing Trellis coders in the digital RF transmitters. A transport stream emitter transmits the digital signal to the plurality of digital RF transmitters.
H04L 1/22 - Dispositions pour détecter ou empêcher les erreurs dans l'information reçue en utilisant un appareil en excédent pour accroître la fiabilité
H03M 13/25 - Détection d'erreurs ou correction d'erreurs transmises par codage spatial du signal, c. à d. en ajoutant une redondance dans la constellation du signal, p.ex. modulation codée en treillis [TMC]
H04B 7/06 - Systèmes de diversité; Systèmes à plusieurs antennes, c. à d. émission ou réception utilisant plusieurs antennes utilisant plusieurs antennes indépendantes espacées à la station d'émission
H04L 7/10 - Dispositions pour synchronisation initiale
H04L 27/02 - Systèmes à courant porteur à modulation d'amplitude, p.ex. utilisant la manipulation par tout ou rien; Modulation à bande latérale unique ou à bande résiduelle
H04N 7/20 - Adaptations pour la transmission sur une bande de fréquence du domaine des GHz, p.ex. par satellite
25.
APPARATUS, SYSTEMS AND METHODS FOR PRODUCING COHERENT SYMBOLS IN A SINGLE FREQUENCY NETWORK
A system, method, apparatus and computer code are provided for producing coherent symbols from digital RF transmitters. A receiver receives a first initialization packet containing a plurality of stuff bytes and Trellis coders are deterministically initialized using the first initialization packet.
brevets
