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51. 发明专利

CA2270103A1 RECOGNITION OF A SINGLE FREQUENCY TONE 未知
公开(公告)号：CA2270103A1
公开(公告)日：2000-10-23
申请号：CA2270103
申请日：1999-04-23
申请人： NEWBRIDGE NETWORKS CORP
发明人： VERREAULT ERIC
IPC分类号： H04B17/391 , H04B3/23 , H04B17/00
摘要： A fast-converging, computationally simple, method for recognizing a single frequency tone or a sinusoid in a signal without prior knowledge of the tone frequency. The method employs a second order or higher auto-regressive model and includes: (a) sampling the signal at a constant sampling rate, and, for each sample, recursively determining a finite number of correlation coefficients using a time-reversed, exponentially weighted, future sliding equivalent of the signal, wherein the correlation coefficients are determined using pre-existing values of the correlation coefficients determined in a previous iteration, a current sample of the signal and at least two consecutively previous samples of the signal; (b) periodically determining at least the second auto-regressive coefficient modelling the signal using the correlation coefficients; and (c) recognizing the presence of the tone based on the value of the second auto-regressive coefficient.

52. 发明专利

AT176563T 未知
公开(公告)号：AT176563T
公开(公告)日：1999-02-15
申请号：AT94916840
申请日：1994-05-30
申请人： MARTIN COMMUNICATIONS PTY LTD
发明人： BEARD DAVID LEWIS , MARTIN ANDREW LOUIS
IPC分类号： G01R31/28 , H04B1/10 , H04B17/00 , H04B17/391 , H04L12/26
摘要： PCT No. PCT/AU94/00287 Sec. 371 Date Dec. 5, 1995 Sec. 102(e) Date Dec. 5, 1995 PCT Filed May 30, 1994 PCT Pub. No. WO94/29975 PCT Pub. Date Dec. 22, 1994A fading simulator for generating multipath-faded test signals which have attenuation notches of precisely controllable frequency position and attenuation depth from a modulated input signal of known bandwidth. The input signal is fed to a splitter that directs two in-phase components to a first path and a second path. The input to each path is divided by a splitter into in-phase and quadrature sub-signals having a quadrature phase relationship, each sub-signal being fed to a respective inverting attenuator, the outputs of the attenuators then being combined in a combiner and the combined output being passed through a variable delay line to generate the output of the respective path. The outputs of each path are then combined in a combiner circuit to generate the multipath-faded test signal. All four inverting attenuators are preferably substantially identical to one another so that the two paths have close to identical temperature-drift and other characteristics. The attenuators and delay lines are electronically controlled in tandem, preferably using a microprocessor and stored program, to generate precision, static or dynamic, attenuation notches desired.

53. 发明专利

DE4341201A1 Simulation arrangement for fading phenomena, e.g. as appearing during directional transmission 未知
公开(公告)号：DE4341201A1
公开(公告)日：1995-06-22
申请号：DE4341201
申请日：1993-12-03
申请人： SCHMITZ GEREON , SPANNAUS THOMAS
发明人： SCHMITZ GEREON , SPANNAUS THOMAS
IPC分类号： H04B17/391 , H04B17/00
摘要： The depth of fading and their frequency levels can be continuously varied by electronically adjustable components. The transmission signal is split into a direct and an indirect beam which are subject to different attenuation and cycle length effects before being joined together again. The indirect beam passes through a quarter wavelength resonator with variable terminal resistance and resonance length. It is joined with the direct beam by superimposing it with the echo signal from the resonator. The depth of the damping is determined by the terminal resistance and the frequency depends on the average frequency of the transmission band from the resonator length.

54. 发明专利

DE3840498C1 未知
公开(公告)号：DE3840498C1
公开(公告)日：1990-06-13
申请号：DE3840498
申请日：1988-12-01
申请人： ROHDE & SCHWARZ GMBH & CO KG, 8000 MUENCHEN, DE
发明人： MAUCKSCH, THOMAS, DIPL.-ING., 8201 OSTERMUENCHEN, DE , HOLZMANN, GOTTFRIED, DIPL.-ING., 8017 EBERSBERG, DE , KOERBER, FRANK, DIPL.-ING. (FH), 8038 GROEBENZELL, DE
IPC分类号： H04B17/391
摘要： For generating an RF signal modulated by a message and distorted by a predetermined fading profile for testing RF receivers, a sequence of digital phase and amplitude values which corresponds to the message modulation is arithmetically processed by a predetermined fading profile and stored in memory, and an RF carrier is amplitude and phase modulated by the stored values to produce a testing signal for the RF receivers.

55. 发明专利

DE3619175A1 Method for laboratory simulation of multipath fading processes 未知
公开(公告)号：DE3619175A1
公开(公告)日：1987-12-10
申请号：DE3619175
申请日：1986-06-06
申请人： ANT NACHRICHTENTECH
发明人： BESSAI HORST DR ING , LOREK WERNER DR ING
IPC分类号： G01R27/28 , G01R29/00 , H04B17/391 , H04B17/00
摘要： To simulate multi-path fading processes on microwave links in the laboratory, a frequency-selective variable attenuation is to be achieved in the transmission band. For this purpose, the transmitted signal x is split in familiar manner into a direct and an indirect beam which, before they are recombined, are subject to different attenuation and propagation-time influences. The indirect beam is produced after passing through a lambda /4 resonator, the terminating impedance and resonator length l of which can be changed. Recombination with the direct beam is carried out by heterodyning the latter with the echo signal returning from the lambda /4 resonator due to a mismatch, the depth of the attenuation dip being determined by the terminating impedance, its frequency deviation from the centre frequency of the transmission band being determined by the resonator length l. By connecting a number of lambda /4 resonators, decoupled by isolating amplifiers, in cascade, a number of frequency-selective attenuation dips can be achieved. If the length of the lambda /4 resonator is changed by adding or disconnecting discrete line sections via a computer-controlled (9) switching matrix (16) and if its resistive termination is changed via a voltage-controlled field-effect transistor (17), an automatic signature measurement is possible (Figure 3).

56. 发明专利

ES2929894T3 Sistemas, métodos y dispositivos para la detección automática de señal con extracción de características temporales dentro de un espectro 未知
公开(公告)号：ES2929894T3
公开(公告)日：2022-12-02
申请号：ES18741944
申请日：2018-01-19
申请人： DIGITAL GLOBAL SYSTEMS INC
发明人： DZIERWA RONALD , KLEINBECK DAVID
IPC分类号： G06N5/04 , G06N3/08 , G06N20/00 , H04B17/15 , H04B17/26 , H04B17/27 , H04B17/309 , H04B17/391
摘要： Se describen sistemas, métodos y aparatos para la detección automática de señales en un entorno de RF. Un aparato comprende al menos un receptor y al menos un procesador acoplado con al menos una memoria. El aparato está en el borde de una red de comunicación. El aparato barre el entorno de RF en un período predeterminado y extrae al menos una característica de tiempo-frecuencia. El aparato crea un mapa de conocimiento que comprende al menos una característica de tiempo-frecuencia. Los datos espectrales en tiempo real se restriegan contra el mapa de conocimiento. al menos una señal en el entorno de RF se detecta en la limpieza. (Traducción automática con Google Translate, sin valor legal)

57. 发明专利

GB2587115B Real-time propagation analysis for communications systems 未知
公开(公告)号：GB2587115B
公开(公告)日：2022-10-19
申请号：GB202016354
申请日：2019-04-15
申请人： COMMSCOPE TECHNOLOGIES LLC
发明人： SAUL A TORRICO
IPC分类号： H04B17/391 , H04B17/21
摘要： A method for providing real-time propagation analysis is provided. The method includes receiving a request for propagation analysis from a wireless communication device located at a specified geographic location, selecting a propagation model from a plurality of propagation models based on available databases for the geographic location, generating a path loss estimation using the selected propagation model, and providing the path loss estimation to the wireless communication device.

58. 发明专利

RU2765989C1 Эмулятор беспроводного канала связи с переключаемым режимом дуплексного разнесения приема и передачи 未知
公开(公告)号：RU2765989C1
公开(公告)日：2022-02-07
申请号：RU2020140984
申请日：2020-12-11
申请人： OBSHCHESTVO S OGRANICHENNOJ OTVETSTVENNOSTYU «RADIO GIGABIT»
发明人： MOZHAROVSKIJ ANDREJ VIKTOROVICH , SOJKIN OLEG VALEREVICH , TIKHONOV SERGEJ ALEKSANDROVICH , ARTEMENKO ALEKSEJ ANDREEVICH , MASLENNIKOV ROMAN OLEGOVICH , VOSKOBOJNIKOVA ANASTASIYA ALBERTOVNA , SHALYGIN ANTON ALEKSEEVICH
IPC分类号： H04B17/391
摘要： Изобретениеотноситсяк областииспытательногооборудованияи можетбытьиспользованодлямониторингаилииспытанийприемопередающихрадиочастотныхсистемсвязи. Техническийрезультатвыражаетсяв упрощенииконструкцииэмулятораканаласвязи, расширенииегорабочегодиапазоначастоти уменьшениистоимостиегокомпонентнойбазы. Указанныйтехническийрезультатдостигается, втомчисле, засчетиспользованияв эмуляторебеспроводногоканаласвязис переключаемымрежимомдуплексногоразнесенияприемаи передачидополнительноготракта, всоставекотороговместосложныхв синхронизацииактивныхпереключателейилиузкополосныхциркуляторов, выступающихв качествеустройствразделенияприемногои передающеготрактовприработев дуплексномрежимевременногоразнесенияприемаи передачи, используютконструктивнопростыеширокополосныепассивныеделителимощности, чтов совокупностис переключателемпозволяетиспользоватьэмуляторбеспроводногоканаласвязидлятестированиясистемсвязи, работающихкакв режимечастотногодуплекса, таки врежимевременногоразнесенияприемаи передачи, втомчислеи сиспользованиемтехнологии MIMO. 16 з.п. ф-лы, 10 ил.

59. 发明专利

FR3071984B1 MODULE DE CORRECTION D'UNE FONCTION DE TRANSFERT D'UN CANAL DE TRANSMISSION D'UN SYSTEME DE COMMUNICATION CDMA, RECEPTEUR ET PROCEDE ASSOCIES 未知
公开(公告)号：FR3071984B1
公开(公告)日：2021-10-29
申请号：FR1759091
申请日：2017-09-29
申请人： ALSTOM TRANSP TECH
发明人： ORION JACQUES
IPC分类号： H04B1/7093 , H04B1/7113 , H04B17/391
摘要： L'invention concerne un module (24) de correction d'une fonction de transfert (H(w)) d'un canal de transmission (16) d'un système de communication CDMA comprenant au moins un émetteur (12) de donnée(s) CDMA et un récepteur (14) de données CDMA, le récepteur de données(s) CDMA comprenant le module de correction (24), le module de correction (24) étant propre à appliquer, au signal reçu (SR) par le récepteur (12), une fonction de correction correspondant à la fonction complexe conjuguée de la fonction de transfert (H(w)).

60. 发明专利

GB2581112B A simulation system and testing method of AIS signals for airborne receiver 未知
公开(公告)号：GB2581112B
公开(公告)日：2021-02-17
申请号：GB202008563
申请日：2018-12-07
申请人： SHANGHAI ADVANCED AVIONICS CO LTD
发明人： DIFEI CHEN , QIANG SUN , YINGNAN LU
IPC分类号： H04B7/185 , H04B17/391
摘要： The present invention discloses a simulation system and testing method of AIS signals for airborne receiver. The simulation system comprises: multiple AIS receivers for receiving AIS signals of vessels, each AIS receiver being respectively connected to a timing unit, and the multiple AIS receivers being connected to a centralized processor by means of a communication network; the centralized processor for combining data of the multiple AIS receivers, deleting redundant data, and forming an AIS database; a flight simulator for manipulating an altitude and direction of an aircraft, and simulating a flight path of a real aircraft; and an AIS signal generator for incorporating the AIS database according to an aircraft position and time point sent from the flight simulator, calculating all AIS signals received by the aircraft at the time point, and sending the AIS signals to an RF signal generator to generate VHF RF signals. The present invention resolves the issue of large differences between existing airborne AIS simulation tests and actual application scenarios, and is applicable to the development of a airborne AIS signal simulation and a testing apparatus.

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