| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 455670160 | Phase measuring (e.g., group delay, propagation effect, etc.) | 16 |
| 20120295548 | SYSTEM FOR CHARACTERIZING MIXER OR CONVERTER RESPONSE - A network analyzer comprises: a signal source configured to supply an input signal to a device, wherein the device is configured to generate a phase reference signal; a receiver configured to receive the phase reference signal from the device and to measure a phase response of the device according to the phase reference signal; and a calibration component configured to compare the measured phase response of the device with an actual phase response of the device to identify a tracking parameter for the receiver. | 11-22-2012 |
| 20110143682 | APPARATUS AND METHOD OF PREDICTING RADIO WAVE ENVIRONMENT - Provided is an apparatus and method of predicting a radio-wave environment. The apparatus may include an arrival recognition unit to determine whether a ray emitted from a transmission unit of the ray tracing scheme arrives within a reception radius, a position determination unit to determine an arrival position where the ray arrives within the reception radius, and a processing unit to correct the reception radius by differently applying a size of the ray according to the arrival position. | 06-16-2011 |
| 20120244819 | Combined Sensing Methods for Cognitive Radio - Embodiments of cognitive radio technology can recover and utilize under-utilized portions of statically-allocated radio-frequency spectrum. A plurality of sensing methods can be employed. Transmission power control can be responsive to adjacent channel measurements. Digital pre-distortion techniques can enhance performance. Embodiments of a high dynamic range transceiver architecture can be employed. | 09-27-2012 |
| 20090286485 | RADIO COMMUNICATION UNIT AND METHOD FOR CALCULATING FREQUENCY SHIFT - A radio communication unit includes: a reference-signal extraction section that extracts a phase of a reference signal from a baseband signal; a frequency-shift calculation section that calculates a phase shift of the received reference signal with respect to time, and calculates a frequency shift of the received carrier frequency; and an estimation-range decision section that determines, based on the calculated frequency shift, an estimation range used in the frequency-shift calculation section for estimating the frequency shift in a next slot. | 11-19-2009 |
| 20100304687 | METHODS AND APPARATUS FOR SIMULTANEOUS ESTIMATION OF FREQUENCY OFFSET AND CHANNEL RESPONSE FOR MU-MIMO OFDMA - Methods and apparatus are provided for simultaneous estimation of frequency offset and channel response for a communication system, such as a MU-MIMO communication system. An iterative method is provided for estimating frequency offset and channel response for a plurality of frequency resources. The channel response is estimated for a set of users sharing a given one of the frequency resources. In addition, the frequency offset is estimated for the users in the set, wherein the channel response and frequency offset of users not in the set are maintained at their latest updated values. Initially, the channel response of a user can be an ideal channel response and the frequency offset can be approximately zero. | 12-02-2010 |
| 20110009071 | Coherence Time Estimation and Mobility Detection for Wireless Channel - Techniques are provided to measure how fast a wireless channel is changing between a first wireless communication device (e.g., a wireless base station or access point) and a second wireless device (e.g., a wireless client device) based on signals that the first communication wireless device receives at a plurality of antennas from a second wireless communication device. Techniques are also provided to measure a degree of mobility of the second wireless communication device based on signals received at the first communication wireless device from the second communication wireless device. | 01-13-2011 |
| 20110143683 | Portable Electronic Device Positioning Based On Multipath Characterization Information Associated With Wireless Network Transmitting Devices - Techniques are provided which may be implemented in various methods and/or apparatuses to allow a portable electronic device to characterize and/or otherwise identify that certain wireless signals may be multipath signals and/or non-multipath signals. Given such signal/environment characterization information, a portable electronic device may select particular wireless signals for use in signal-based location estimation process and/or other communication processes. | 06-16-2011 |
| 20100285754 | RADIO EQUIPMENT, AND METHOD AND PROGRAM OF DETERMINING SIGNAL TRANSMISSION SPEED - It is possible to determine a signal transmission speed in a signal transmission system operated by radio equipment upon receiving transmission of a base band signal from a radio equipment control (REC) and operates on the signal. The radio equipment that operates by receiving transmission of a base band signal from a radio equipment control includes: an interface section that generates a parallel signal and a clock signal based on the base band signal; a control section that outputs a signal of a specified value to be compared with the clock signal generated by the interface section; and a clock circuit that detects whether or not the clock signal generated by the interface section coincides with the signal of the specified value outputted from the control section, and outputs a coincidence signal when both of the signals coincide with each other. | 11-11-2010 |
| 20120309324 | MEASUREMENT METHOD AND APPARATUS - Methods and apparatus for providing for determining the time of receipt of a received signal are described. In particular, there is described method and apparatus for receiving a signal, and using a phase characteristic, such as the received phase angle at which a received signal is initially sampled, together with the frequency of the received signal in order to determine a receive time error. The receive time error can then subsequently be used to determine the actual time of receipt of the received signal. | 12-06-2012 |
| 20120302177 | PROPAGATION PATH ESTIMATION METHOD AND PROGRAM AND APPARATUS USING THE SAME - A propagation path estimation method using an imaging method according to the invention includes a step of, in a case where a reflectarray which causes reflection and scattering in a different direction (θ−η)° from a specular reflection direction θ° exists on a propagation path from a transmission point to a reception point RX of the radio wave, calculating a virtual reception point VRX by rotating the reception point RX about a rotation center point O, and estimating the propagation path by using the virtual reception point VRX. | 11-29-2012 |
| 20120045999 | ADAPTIVE ARRAY ANTENNA DEVICE AND ANTENNA CONTROL METHOD - An adaptive array antenna device ( | 02-23-2012 |
| 20090068958 | FILTER FREQUENCY CHARACTERISTIC DETECTION DEVICE AND FILTER FREQUENCY CHARACTERISTIC TESTING DEVICE - A filter frequency characteristic detection device includes a filter which receives a first signal and a second signal, a comparator which compares the first signal and the second signal which have passed through the filter, an offset adjusting circuit which gives an offset to each of the first signal and the second signal to be input to the comparator, a duty ratio detection circuit which detects, as a duty ratio, a change in an amplitude of the first signal and the second signal based on an output result from the comparator, and a frequency characteristic adjusting circuit which adjusts the frequency characteristic of the filter based on a detection result from the duty ratio detection circuit. | 03-12-2009 |
| 20110003560 | RADIO COMMUNICATION SYSTEM, COMMUNICATION APPARATUS, RADIO COMMUNICATION NETWORK SYSTEM AND METHOD THEREFOR - A radio communication system provided with a communication device and a radio communication network system is characterized by comprising a transmission delay estimate information transmitting means for transmitting transmission delay estimate information to the radio communication network system when the transmission condition of the transmission delay estimate information is met. | 01-06-2011 |
| 20100167661 | TRANSMITTER-RECEIVER CIRCUIT AND METHOD FOR DISTANCE MEASUREMENT BETWEEN A FIRST NODE AND A SECOND NODE OF A RADIO NETWORK - A transmitter-receiver circuit and a method for distance measurement between a first node and a second node of a radio network is provided, wherein a mode of the first node and a mode of the second node are switched from a normal mode for communication in the radio network to a mode for distance measurement, wherein, in the mode for distance measurement for a transit time measurement, a radio signal is transmitted by the first node and received by the second node and a radio signal is transmitted by the second node and received by the first node and a first distance value is determined by measuring the transit time of the radio signals. In the mode for distance measurement, for a phase measurement an unmodulated carrier signal is transmitted as a radio signal by the first node and received by the second node and an unmodulated carrier signal is transmitted as a radio signal by the second node and received by the first node and a second distance value is determined by measurement and calculation from four values of the phases for different frequencies of the radio signals. Whereby, the distance between the first node and the second node is calculated from the first distance value of the transit time measurement and the second distance value of the phase measurement. | 07-01-2010 |
| 20100167662 | SYSTEM, METHOD, AND CIRCUIT FOR DISTANCE MEASUREMENT BETWEEN TWO NODES OF A RADIO NETWORK - A system and method for distance measurement between two nodes of a radio network is provided. A first unmodulated carrier signal is transmitted by the first node and received by the second node. A second unmodulated carrier signal is transmitted by the second node and received by the first node. A first value and a second value of a first phase are measured by the first node, whereby the first value of the first phase is assigned to a first frequency of the received second carrier signal and the second value the first phase is assigned to a second frequency of the received second carrier signal, whereby the first frequency and the second frequency have a frequency difference. A third value and a fourth value of a second phase are measured by the second node, whereby the third value of the second phase is assigned to a third frequency of the received first carrier signal and the fourth value of the second phase to a fourth frequency of the received first carrier signal, whereby the third frequency and the fourth frequency have the frequency difference. The distance is determined from the frequency difference from the first value and the second value of the first phase and from the third value and fourth value of the second phase. | 07-01-2010 |
| 20130122823 | METHOD, APPARATUS AND SYSTEM FOR PROVIDING FEEDBACK TO A TRANSMIT DIVERSITY DEVICE - A method and system for improving closed loop feedback in transmit diversity communication. In one embodiment of the invention, a predetermined variation of one or more transmit diversity parameters is performed at the transmit diversity transmitter. The receiver compares the transmit diversity parameter values of the received signals to the predetermined variation and transmits to the transmitter a value of a transmit diversity correction parameter. The transmitter may use this correction value to modify the transmit diversity parameter in a subsequent transmission. | 05-16-2013 |
