Mobile radio communications system
This invention is a mobile radio communications system which has radio base stations that are connected to mobile stations by radio channels, and a mobile switching center which is connected to these ... Read More
Inventors: Kaiyama, Akira; Shinagawa, Noriteru; Nakano, Masatomo;, Assignee: NTT Mobile Communications Network Inc. (Tokyo, JP) |
Device for measuring the average value of pulse signals
OF THE PRESENT FIG. 5 illustrates an embodiment of the present invention, in which the parts corresponding to those in FIG. 1 are identified by the same reference numerals. The construction from the ... Read More
Inventors: Hirose, Masaaki; Katoh, Kazuo; Ueki, Yutaka; Hirakoso, Yohei; Satoh, Mitsunori; Kosuge, Takashi;, Assignee: Advantest Corporation (JP) |
Audio scrambling system for scrambling and descrambling audio signals
Therefore, the first object of the present invention is to provide an audio scrambling system for processing any pulse-code modulation (PCM) digital audio signal without needing to transfer non-audio ... Read More
Inventors: Ibaraki, Susumu; Katta, Noboru; Nakamura, Seiji; Murakami, Hiroki;, Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka-fu, JP) |
Radio communication systems
I claim: 1. A radio communication system comprising a base station which is arranged in communication with a plurality of mobile stations for the transmission of speech using a first set of channels a... Read More
Inventors: Hulbert, Anthony P.;, Assignee: Roke Manor Research Limited (Hampshire, GB2) |
Multi-user acquisition procedure for multipoint-to-point synchronous CDMA systems
The foregoing and other problems are overcome and the objects of the invention are realized by methods and apparatus in accordance with embodiments of this invention, wherein a subscriber unit is prov... Read More
Inventors: Kingston, Samuel C.; Giallorenzi, Thomas R.; Steagall, Robert William; Matolak, David;, Assignee: L-3 Communications Corporation (New York, NY) |
Method of addressing messages and communications system
The invention provides a wireless identification device configured to provide a signal to identify the device in response to an interrogation signal. One aspect of the invention provides a method of e... Read More
Inventors: Wood, Jr., Clifton W.;, Assignee: Micron Technology, Inc. (Boise, ID) |
Method of detecting reference symbols for a digital data receiver
A particular object of the present invention is to mitigate that drawback. More precisely, an object of the invention is to provide a method of detecting reference signals that are uniformly inserted ... Read More
Inventors: Thebault, Bertrand; Sehier, Philippe;, Assignee: Alcatel Telspace (Nanterre Cedex, FR) |
Method for adaptively filtering doppler signals using a complex time domain filter
The present invention relates to a time domain technique which implements an adaptive wall filter to improve imaging of low-velocity blood flow by removing from Doppler signals those signals associate... Read More
Inventors: Daft, Christopher M. W.; Hall, Anne L.; Noujaim, Sharbel E.; Thomas, Lewis J.; Welles, II, Kenneth B.;, Assignee: General Electric Company (Schenectady, NY) |
Spatial diversity processing for underwater acoustic telemetry
OF PREFERRED EMBODIMENT(S) The spatial diversity system of the present invention provides a means of increasing reliability without the throughput and bandwidth cost of a very low-rate error correcti... Read More
Inventors: Catipovic, Josko A.; Freitag, Lee E.;, Assignee: |
Developing a channel impulse response by using distortion
FIG. 1 shows a high-level block diagram of a DAB communications system 10 embodying the principles of the invention. DAB communications system 10 comprises transmitter 100, communications channel 200... Read More
Inventors: Wang, Jin-Der;, Assignee: Lucent Technologies Inc. (Murray Hill, NJ) |
Decision feedback filter device in the frequency domain
A more advantageous way to improve the correction of the intersymbol interference is to use an adaptive filter called decision feedback adaptive filter, working in the time domain. A filter of this ki... Read More
Inventors: Berberidis, Constantinos; Palicot, Jacques;, Assignee: France Telecom (Paris, FR) |
Method and apparatus for DC offset correction
What is claimed is: 1. A method of correcting for DC offsets in a digital signal, comprising the steps of: receiving a digital signal (an I/Q signal); estimating the peaks of the digital signal using ... Read More
Inventors: Traylor, Kevin B.; Fang, Jing;, Assignee: Motorola, Inc. (Schaumburg, IL) |
Learning sequence for estimating a transmission channel and corresponding estimator device
What is claimed is: 1. A learning sequence of symbols for estimating a transmission characteristic of a transmission channel of length L on which said sequence is transmitted, said sequence comprising... Read More
Inventors: Mourot, Christophe; Wautier, Armelle; Dany, Jean-Claude;, Assignee: Alcatel N.V. (Amsterdam, NL) |
Method for receiving multicarrier digital signals
An important consideration in the context of such systems is to find a system-conformal signal in the situation where a receiver is switched on or is tuned into another channel. To do this, the receiv... Read More
Inventors: Klank, Otto; Klausberger, Wolfgang; Laabs, Jurgen;, Assignee: DeutscheThomson-Brandt GmbH (Villingen-Schwennigen, DE) |
Peak to average power ratio reduction
The present inventions provide methods and systems for estimating the distortion of a received signal. Generally, any type of distortion may be estimated in order to better decode he received signal. ... Read More
Inventors: Tellado, Jose; Cioffi, John M.;, Assignee: The Board of Trustees of the Leland Stanford Junior University (Palo Alto, CA) |
Compensation method for I/Q channel imbalance errors
OF THE PREFERRED EMBODIMENT Generally, the invention contemplates a method by which correctable I/Q imbalance errors in a complex receiver can be detected and compensated for without the use of speci... Read More
Inventors: Alelyunas, Carl H.; Norrell, Andrew L.; Parizhsky, Vladimir;, Assignee: U.S. Robotics Access Corp. (Lincolnshire, IL) |
Self-calibrating, self-correcting transceivers and methods
The present invention is directed to a self-calibrating, self-correcting transceiver. This goal is achieved with a signal processor which can inject calibration signals of known levels and frequencies... Read More
Inventors: Narumi, Robert T.; Linder, Lloyd F.; Hirata, Erick M.; Devendorf, Don C.; Gorder, Matthew S.; Phan, Phung N.; Chen, Ricky Y.;, Assignee: Raytheon Company (Lexington, MA) |
Multi-channel serdes receiver for chip-to-chip and backplane interconnects and method of operation thereof
To address the above-discussed deficiencies of the prior art, the present invention provides a multi-channel serdes receiver, a method of operating the receiver and an integrated circuit configured as... Read More
Inventors: Yang, Fuji; Larsson, Patrick; O'Neill, Jay;, Assignee: Agere Systems Inc. (Allentown, PA) |
Radiation thermometers
We claim: 1. A method of monitoring at least one temperature characteristic of a rotating body, comprising sensing radiation emitted by the body in wavelength bands centered on two different wavelengt... Read More
Inventors: Beynon, Thomas G. R.; Kirby, Peter J.;, Assignee: Land Infrared Limited (Dronfield, GB2) |
Method and apparatus for determining signal strength in a variable data rate system
The present invention determines signal strength in a variable rate communication system in a rate independent manner. In the preferred embodiment of the present invention data is grouped in symbols c... Read More
Inventors: Ziv, Noam Abraham; Padovani, Roberto;, Assignee: Qualcomm Incorporated (San Diego, CA) |
Method of signal transmission in a mobile communication system
Therefore, an object of the present invention is to provide a method of signal transmission between radio base stations in a mobile communication system, with which the facility cost and the operation... Read More
Inventors: Yoshimura, Yukio; Yamashita, Tetsuya;, Assignee: NEC Corporation (Tokyo, JP) |
Monolithic integrated optical time delay network for antenna beam steering
The present invention seeks to provide an optical time delay network for phased array antennas that is lighter and more compact than previous systems, does not suffer from beam squint or signal disper... Read More
Inventors: Yap, Daniel; Ng, Willie W.; Hayes, Robert R.;, Assignee: Hughes Aircraft Company (Los Angeles, CA) |
Method and apparatus for measuring idle channel quality in an RF frequency sharing environment
The present invention addresses this need by providing a method and apparatus for measuring idle channel quality in a radio frequency (RF) system. The method of measuring idle channel quality includes... Read More
Inventors: Hulsebosch, Thomas G.;, Assignee: Motorola, Inc. (Schaumburg, IL) |
Synchronizing method in a mobile radio system
The present invention is based on the time sharing in different frames of the traffic flow (TDMA-principle) and also on the access to a given ciphering sequence of relatively long duration (about 3 mi... Read More
Inventors: Dahlin, Jan E. .ANG.. S.; Ghisler, Walter; Persson, Bengt Y.;, Assignee: Telefonaktiebolaget L M Ericsson (Stockholm, SE) |
Data processor with sets of two registers where both registers receive identical information and when context changes in one register the other register remains unchanged
In general, one form of the invention is a data processing device including an instruction decoder and an arithmetic logic unit having first and second inputs and an output. An accumulator is connecte... Read More
Inventors: Ehlig, Peter N.; Boutaud, Frederic; Hollander, James F.;, Assignee: Texas Instruments Incorporated (Dallas, TX) |
Method for adjusting clocks of multiple data processors to a common time base
As herein described, according to one aspect of the invention, there is provided a method for synchronizing the frequency of a slave clock to that of a master clock, wherein the master clock provides ... Read More
Inventors: Potash, Richard J.; Burns, Steven K.;, Assignee: Computer Sports Medicine, Inc. (Cambridge, MA) |
Sequential decoder for decoding of convolutional codes
The decoding of a convolutional code with known channel parameters can be viewed as a tree-search problem. The Fano technique provides one method of decoding convolutional code. When operated with su... Read More
Inventors: Beerel, Peter A.; Chugg, Keith M.; Ozdag, Recep O.; Tugsinavisut, Sunan; Singh, Sushil K.; Thiennviboon, Phunsak;, Assignee: University of Southern California (Los Angeles, CA) |
Method for recognizing digital information in transmission in mobile radio communications systems
I claim: 1. A method for recognizing digital information of a digital information element in a clocked digital information transmission, comprising the steps of: first, sampling the information elemen... Read More
Inventors: Gupta, Probodh D.;, Assignee: Siemens Aktiengesellschaft (Berlin & Munich, DE) |
Ground device for communicating with an elevated communication hub and method of operation thereof
OF THE DRAWINGS The method and apparatus of the present invention provides inexpensive and relatively simple devices and methods for communicating between multiple wireless communication devices. Thi... Read More
Inventors: Ibanez-Meier, Rodrigo; Kapoor, Vijay; Aguirre, Sergio;, Assignee: Motorola, Inc. (Schaumburg, IL) |
Control and telemetry signal communication system for geostationary satellites
Briefly, this invention contemplates the provision of a geosynchronous satellite control and telemetry communication system in which branch modules distributed throughout the satellite serially interf... Read More
Inventors: Cronauer, Thomas D.; Cady, Anne M.; Schulz, Kenneth R.; Yra, Pablito B.; Burri, Joe;, Assignee: Lockheed Martin Corporation (Manassas, VA) |
Multiplexer-related 
