Class / Patent application number | Description | Number of patent applications / Date published |
375131000 | Hybrid form | 15 |
20080304549 | HYBRID BAND DIRECTED ENERGY TARGET DISRUPTION - A technique for disrupting the operation of a target containing nonlinear electronic devices generally includes generating a high frequency signal; generating a low frequency signal; modulating the high frequency signal with the low frequency signal; and emitting the modulated high frequency signal at the target. | 12-11-2008 |
20080310479 | Signal transmission method with frequency and time spreading - A transmission system using frequency and time spreading techniques is disclosed. The transmission system allows priority of transmission parameters and adjustment of same in relation to transmission quality and channel characteristics measured in real time. | 12-18-2008 |
20090028219 | Coherent and non-coherent hybrid direct sequence/frequency hopping spread spectrum systems with high power and bandwidth efficiency and methods thereof - A hybrid spread spectrum system includes a signal combiner for (a) receiving a plurality of spread spectrum encoded data signals and (b) forming a plurality of combined signals. A first set of mixers is included for (a) receiving the plurality of combined signals and at least two carriers, and (b) forming at least a two-carrier, constant envelope signal. A second set of mixers is also included for (a) receiving the at least two-carrier, constant envelope signal and a transmitter hopping signal and (b) forming a hybrid spread spectrum signal. The combined signals include (a) [s | 01-29-2009 |
20090097530 | Hybrid channel map - A hybrid channel map is described. In an implementation, a client obtains a plurality of channel maps, each from a respective one of a plurality of content providers that are configured to provide content via channels to the client. A hybrid channel map is formed from the plurality of channel maps. | 04-16-2009 |
20100103980 | Robust Low-Frequency Spread-Spectrum Navigation System - Methods and apparatus are described for a navigation system. A process includes providing a plurality of transmitters distributed throughout a desired coverage area; locking the plurality of transmitters to a common timing reference; transmitting a signal from each of the plurality of transmitters. An apparatus includes a plurality of transmitters distributed throughout a desired coverage area; wherein each of the plurality of transmitters comprises a packet generator; and wherein the plurality of transmitters are locked to a common timing reference. | 04-29-2010 |
20100124254 | SYSTEMS AND ETIQUETTE FOR HOME GATWAYS USING WHITE SPACE - Methods and systems for sharing white space with primary services and other emerging services are provided. Signal distribution within a specified location, such as a dwelling, is performed using a home gateway that identifies unused white space, reserves such white space spectrum, and delivers data to one or more devices at the respective location using the reserved spectrum. Signalling between the devices and the gateway is performed over a shared signalling channel, which enables the gateway to advise the devices from where and when to receive data. The gateway also uses a common spectrum reservation OFDM symbol to advise the neighbouring gateways of the local spectrum reservation. | 05-20-2010 |
20100238976 | GLOBAL NAVIGATION RECEIVER - A signal processing system and method for a GNSS digital signal wherein a carrier-stripped GNSS signal, is sampled according to a variable rate, determined by the code NCO, and including a timing circuit arranged to generate a timestamp code determining the sampling time of at least one of the samples in the buffer memory. By taking code samples in this way it is possible to transfer the samples asynchronously to a separate processor for the search task to be performed, for example an asynchronous parallel correlator implemented in the same silicon in hardware, or a media processor such as a graphics accelerator implemented in the same device or a separate physical device. | 09-23-2010 |
20110206086 | SYSTEMS/METHODS OF SEQUENTIAL MODULATION OF A SINGLE CARRIER FREQUENCY BY A PLURALITY OF ELEMENTS OF A WAVEFORM - Systems and/or methods are disclosed for generating a waveform that comprises a plurality of elements by using a Fourier transform and/or an inverse Fourier transform. The waveform that comprises the plurality of elements may be transmitted by transmitting, sequentially in time, the plurality of elements. In some embodiments, the Fourier transform and/or inverse Fourier transform comprises a Fast Fourier Transform and/or Inverse Fast Fourier Transform and the waveform that comprises the plurality of elements may be transmitted by using, sequentially in time, the plurality of elements to modulate a single carrier frequency. | 08-25-2011 |
20120039364 | MULTI-CARRIER SPREAD SPECTRUM DEVICE USING CYCLIC SHIFT ORTHOGONAL KEYING, TRANSMITTER, RECEIVER, AND COMMUNICATION SYSTEM THEREOF - A multi-carrier spread spectrum device using cyclic shift orthogonal keying includes: a modulation unit for receiving a first part of data bits and transforming the first part of data bits to a modulation symbol d | 02-16-2012 |
20120195346 | COMMUNICATION DEVICE AND METHOD FOR PACKET-BASED OFDM COMMUNICATIONS WITH DIFFERING LENGTH CYCLIC PREFIXES - A network communication device is receive packet-based orthogonal frequency division multiplexed (OFDM) transmissions from one or more other devices in a network over a communication channel. The network communication device may determine a delay spread of the communication channel based on receipt of a probe signal from a transmitting device, configure a channel filter to effectively shorten the channel based on the delay spread, and instruct the transmitting device to shorten a length of a cyclic prefix for subsequent packet-based OFDM transmissions to be received from the transmitting device over the channel. | 08-02-2012 |
20130148694 | Dual Fixed Geometry Fast Fourier Transform (FFT) - A method includes executing a first instruction at a processor to perform a first fast Fourier transform (FFT) operation on a set of inputs in a time domain to produce data in a frequency domain, where the set of inputs is in a first order and where the data in the frequency domain is in a second order. The method also includes performing an operation on the data in the frequency domain to produce data in the frequency domain, where the data in the frequency domain is in the second order. The method includes executing a second instruction at the processor to perform a second FFT operation on the data in the frequency domain to produce data in the time domain, where the data in the time domain is in the first order. | 06-13-2013 |
20140169406 | MODULATION AND EQUALIZATION IN AN ORTHONORMAL TIME-FREQUENCY SHIFTING COMMUNICATIONS SYSTEM - A method of data transmission including arranging a set of data elements into an original data frame having a first dimension of N elements and a second dimension of N elements, where N is greater than one. The method includes transforming the original data frame in accordance with a transformation matrix to form a first transformed data matrix having at least N | 06-19-2014 |
20140177677 | METHOD AND DEVICE FOR SIGNAL PROCESSING IN SPREAD SPECTRUM SYSTEM - A method and a device for signal processing in a communication system are provided. The method includes: performing sampling and time-frequency transform on a received first time domain signal to obtain a first frequency domain signal; performing modulus operation on the first frequency domain signal with respect to a preset threshold to obtain a second frequency domain signal; performing inverse time-frequency transform on the second frequency domain signal to obtain a second time domain signal, and performing despreading on the second time domain signal. The embodiments of the present invention can avoid the problem in the prior art that not only the NBI signal but also the SS signal which is a useful signal are filtered out, which results from frequency domain signals of a certain number of frequency points being set to zero, and thereby improve the reliability of signal reception. | 06-26-2014 |
20150146762 | WIRELESS COMMUNICATION SYSTEM - A wireless communication system includes a mobile device carried by a user and an in-vehicle apparatus equipped to a vehicle and communicatively connected with the mobile device. The in-vehicle apparatus includes a transmission unit, a transmission control unit, a reception determination unit, and a position determination unit. The transmission unit transmits low-frequency band request signals generated by spread modulating transmission data with predetermined spreading factors. The transmission control unit controls the transmission unit to generate and transmit first and second request signals having first and second attainable ranges by spread modulation using first and second spreading factors, respectively. The reception determination unit performs reception determination to response signal transmitted from the mobile device in response to the request signal. The position determination unit specifies the first attainable range or the second attainable range as a mobile device position area in response to a reception determination result. | 05-28-2015 |
20150326273 | METHODS OF OPERATING AND IMPLEMENTING WIRELESS OTFS COMMUNCIATIONS SYSTEMS - Computerized wireless transmitter/receiver system that automatically uses combinations of various methods, including transmitting data symbols by weighing or modulating a family of time shifted and frequency shifted waveforms bursts, pilot symbol methods, error detection methods, MIMO methods, and other methods, to automatically determine the structure of a data channel, and automatically compensate for signal distortions caused by various structural aspects of the data channel, as well as changes in channel structure. Often the data channel is a two or three dimensional space in which various wireless transmitters, receivers and signal reflectors are moving. The invention's modulation methods detect locations and speeds of various reflectors and other channel impairments. Error detection schemes, variation of modulation methods, and MIMO techniques further detect and compensate for impairments. The invention can automatically optimize its operational parameters, and produce a deterministic non-fading signal in environments in which other methods would likely degrade. | 11-12-2015 |