| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 41 | WIRELESS COMMUNICATION APPARATUS, WIRELESS COMMUNICATION SYSTEM AND WIRELESS COMMUNICATION METHOD | US14252000 | 2014-04-14 | US20140226742A1 | 2014-08-14 | Qian Yu; Lei Huang; Masayuki Hoshino; Daichi Imamura |
| In a MIMO system using a cross-polarized antenna structure, even if no ideal XPD can be obtained, the interference between different polarized waves can be reduced to allow an effective precoding to be executed. When a MIMO communication is performed between a transmitter and a receiver each using a cross-polarized antenna structure, a channel estimating and precoding selection section of the receiver performs a channel estimation of MIMO channels from the transmitter to the receiver, decides a precoding matrix of a projection matrix for mutually orthogonalizing or substantially orthogonalizing the channel response matrixes for respective different polarized waves, and feeds the determined precoding matrix back to the transmitter. In the transmitter, a precoding processing section applies the precoding matrix to the spatial stream corresponding to one of the polarized waves to perform a precoding, thereby allowing the transmitter to transmit the polarized waves with the orthogonality therebetween maintained. | ||||||
| 42 | WIRELESS COMMUNICATION APPARATUS, WIRELESS COMMUNICATION SYSTEM AND WIRELESS COMMUNICATION METHOD | US14251955 | 2014-04-14 | US20140219381A1 | 2014-08-07 | Qian Yu; Lei Huang; Masayuki Hoshino; Daichi Imamura |
| In a MIMO system using a cross-polarized antenna structure, even if no ideal XPD can be obtained, the interference between different polarized waves can be reduced to allow an effective precoding to be executed. When a MIMO communication is performed between a transmitter and a receiver each using a cross-polarized antenna structure, a channel estimating and precoding selection section of the receiver performs a channel estimation of MIMO channels from the transmitter to the receiver, decides a precoding matrix of a projection matrix for mutually orthogonalizing or substantially orthogonalizing the channel response matrixes for respective different polarized waves, and feeds the determined precoding matrix back to the transmitter. In the transmitter, a precoding processing section applies the precoding matrix to the spatial stream corresponding to one of the polarized waves to perform a precoding, thereby allowing the transmitter to transmit the polarized waves with the orthogonality therebetween maintained. | ||||||
| 43 | Method and Device for Operating a Precoded MIMO System | US14146641 | 2014-01-02 | US20140119466A1 | 2014-05-01 | Taeyoon Kim; Jayesh H. Kotecha |
| A method is provided for generating precoder data (600), comprising: obtaining transmit power data indicative of a transmit power of a plurality of multiple-input/multiple-output signals (610); obtaining signal quality data, the signal quality data including at least one measure of a quality of the plurality of multiple-input/multiple-output signals (620, 630); obtaining channel data with respect to a wireless channel, the channel data including a measure of respective channel parameters of each of a plurality of channel paths in the wireless channel (620, 630); constraining one or more system performance parameters (640); and determining first and second precoder diagonal values (WA and WB) based on the signal quality data, the transmit power data, the channel data, and the one or more constrained system performance parameters (650). | ||||||
| 44 | Communication between modems in XPIC configuration for wireless applications | US13260606 | 2009-03-30 | US08615055B2 | 2013-12-24 | Giovanni Milotta; Antonio Carugati |
| A radio communication network which comprises a plurality of radio links for communicating radio signals with orthogonal polarization. Each radio link comprises a vertical polarization communication device (11a) and a horizontal polarization communication device (11b) which share a local communication channel (11c). Each of these communication devices comprises at least one differential interface stage (21a, 21b, 31a, 31b) for communicating first data over the local communication channel (11c), based on a differential input. Each of these vertical and horizontal communication devices (11a, 11b) comprises means (27, 37) connected to the differential interface stages for communicating second data over the local communication channel by modulating a common mode of the differential interface stages. | ||||||
| 45 | Antenna System And Method For Mitigating Multi-Path Effect | US13933605 | 2013-07-02 | US20130295864A1 | 2013-11-07 | Ming LEE; Wladimiro VILLARROEL; Yasutaka HORIKI; Kwan-ho LEE |
| An antenna system and method utilize a splitter electrically connectable to a single antenna for splitting an RF signal into two signals. A variable phase shifter shifts the phase of one of the signals. A combiner combines the phase shifted and non-phase shifted signals to produce a conditioned signal. A quality examiner circuit changes the amount of phase shift provided by the variable phase shifter to produce a plurality of different conditioned signals. The quality examiner circuit then determines a quality of each conditioned signal and changes the phase shift again to provide the highest quality conditioned signal to a receiver. | ||||||
| 46 | Antenna system and method for mitigating multi-path effect | US12815833 | 2010-06-15 | US08515378B2 | 2013-08-20 | Ming Lee; Wladimiro Villarroel; Yasutaka Horiki; Kwan-ho Lee |
| An antenna system and method utilize a splitter electrically connectable to a single antenna for splitting an RF signal into two signals. A variable phase shifter shifts the phase of one of the signals. A combiner combines the phase shifted and non-phase shifted signals to produce a conditioned signal. A quality examiner circuit changes the amount of phase shift provided by the variable phase shifter to produce a plurality of different conditioned signals. The quality examiner circuit then determines a quality of each conditioned signal and changes the phase shift again to provide the highest quality conditioned signal to a receiver. | ||||||
| 47 | CROSS-POLARIZATION INTERFERENCE COMPENSATION APPARATUS, CROSS-POLARIZATION INTERFERENCE COMPENSATION METHOD, AND PROGRAM | US13640716 | 2011-04-13 | US20130065547A1 | 2013-03-14 | Yuuzou Suzuki |
| Even when transmitters of both polarizations in an opposing station apparatus output different signals, cross-polarization interference is compensated for. A cross-polarization interference compensation apparatus includes a main signal reception unit which receives a signal having a first polarization direction, an interference signal reception unit which receives a signal having a second polarization direction crossing the first polarization direction, a phase control unit which controls a phase of the signal received by the interference signal reception unit, an interference compensation signal generation unit which generates an interference compensation signal by performing weighted combination on a time series of a signal output by the phase control unit, and setting weighting coefficients used for the weighted combination so that the interference compensation signal becomes a cross-polarization interference component of the signal received by the main signal reception unit, a phase estimation unit which estimates a phase difference between the signal received by the main signal reception unit and the signal received by the interference signal reception unit using information on the weighting coefficients, and a compensation unit which compensates the signal having the first polarization direction for cross-polarization interference caused by the signal having the second polarization direction using the interference compensation signal and the signal received by the main signal reception unit, in which the phase control unit controls the phase of the signal received by the interference signal reception unit using the phase difference estimated by the phase estimation unit so that a phase of the signal received by the main signal reception unit and the phase of the signal received by the interference signal reception unit become identical. | ||||||
| 48 | Interference carrier regeneration and interference cancellation apparatus and methods | US12875315 | 2010-09-03 | US08396177B1 | 2013-03-12 | Keith Morris |
| Interference carrier regeneration and interference cancellation involve generating a Cross Polarization Interference Cancellation (XPIC) error signal representative of a difference between a first signal derived from a first communication signal that is received over a wireless communication link and a first symbol decision that is based on the first signal. The first communication signal is affected by interference from a second communication signal, on an orthogonal polarization channel of the same nominal frequency channel, for example. Based on the XPIC error signal and a second symbol decision for the second communication signal, a carrier of interference affecting the first signal from the second communication signal is regenerated. A rotation and derotation arrangement rotates a cross-channel interference signal and derotates a main channel equalizer feedback signal based on the regenerated interference carrier. The derotated main channel equalizer feedback signal can be provided as a feedback signal to a cross-channel interference equalizer. | ||||||
| 49 | Systems and Methods for Cancelling Cross Polarization Interference in Wireless Communication Using Polarization Diversity | US13584794 | 2012-08-13 | US20130034196A1 | 2013-02-07 | Emerick Vann |
| An exemplary system may comprise a first and second device and a first and second power splitter coupled to a single cable. The first device may be configured to receive a first noise signal of a first polarization, and to adaptively cancel, based on the first noise signal, first noise from the noisy signal associated with an orthogonal polarization. The second device may be configured to receive a second noise signal of a second polarization, and to adaptively cancel second noise from the noisy signal associated with an orthogonal polarization based on the second noise signal. The first power splitter may be configured to receive the first noise signal from the single cable and provide the first noise signal to the first device. The second power splitter may be configured to receive the second noise signal from the single cable and provide the second noise signal to the second device. | ||||||
| 50 | ANTENNA SYSTEM AND METHOD FOR OPTIMIZING AN RF SIGNAL | US13378280 | 2010-06-15 | US20120108178A1 | 2012-05-03 | Ming Lee; Wladimiro Villarroel; Kwan-ho Lee; Yasutaka Horiki |
| An antenna system and method utilize an evaluation branch circuit and an implementation branch circuit. These circuits are each connected to both a first antenna input and a second antenna input. An output of the evaluation branch circuit is in communication with a controller while an output of the implementation branch circuit is in communication with a receiver. Each branch circuit includes at least one signal conditioner to change an electrical characteristic of RF signals received from antennas via the antenna inputs. The evaluation branch circuit, controlled by the controller, changes the electrical characteristics of the RF signals in a variety of different ways to discover an optimized evaluation RF signal. Once the optimized evaluation RF signal is determined, the implementation branch circuit is controlled, by the controller, to produce an optimized implementation RF signal in accordance with that discovered by the evaluation branch circuit. | ||||||
| 51 | DIVERSITY ANTENNA SYSTEM AND METHOD UTILIZING A THRESHOLD VALUE | US12815848 | 2010-06-15 | US20100317306A1 | 2010-12-16 | Ming LEE; Wladimiro VILLARROEL; Kwan-ho LEE; Yasutaka HORIKI |
| An antenna system for receiving an RF signal from a first antenna and a second antenna includes a phase shift circuit. The phase shift circuit shifts a phase of the RF signal from the second antenna by one of a plurality of possible phase shifts to produce a phase shifted signal. A combiner combines the RF signal from the first antenna and the phase shifted signal to produce a combined signal. A comparator circuit compares a signal quality of the combined signal with a minimum threshold value to determine if the signal quality of the combined signal is equal to or greater than the threshold value. The comparator circuit is in communicative control of the phase shift circuit and maintains the phase shift of the RF signal received by the second antenna in response to the signal quality of the combined signal being equal to or greater than the threshold value. | ||||||
| 52 | Doppler frequency detector, doppler frequecny estimating method, and recording medium recorded with a program for allowing a computer to execute the method | US11453925 | 2006-06-16 | US07853219B2 | 2010-12-14 | Ryo Tomokiyo |
| Disclosed is a Doppler frequency detector for detecting a Doppler frequency of a received signal. The detector includes a channel estimating unit, a channel phase variation amount calculating unit, a Doppler frequency estimating unit and a calculation interval calculating unit. The channel estimating unit calculates a channel estimate based on a pilot signal in the received signal. The channel phase variation amount calculating unit calculates channel phase variation amount based on the channel estimate and a calculation interval. The Doppler frequency estimating unit estimates the Doppler frequency based on the channel phase variation amount and outputs a Doppler frequency estimate. The calculation interval calculating unit calculates the calculation interval based on the Doppler frequency estimate and supplies the calculated calculation interval to the channel phase variation amount calculating unit. | ||||||
| 53 | Apparatus and method for interference cancellation in wireless mobile stations operating concurrently on two or more air interfaces | US11232346 | 2005-09-21 | US07761075B2 | 2010-07-20 | Joseph R. Cleveland; Seong Eun Kim; Lup M. Loh |
| An apparatus and method for interference cancellation in wireless mobile stations operating concurrently in two or more wireless modes. | ||||||
| 54 | Apparatus and method for estimating a Doppler frequency and a moving velocity of a wireless terminal | US11167833 | 2005-06-27 | US07529328B2 | 2009-05-05 | Kil-Hyen Ryu |
| An apparatus and method for estimating a Doppler frequency and a moving velocity of a wireless terminal are disclosed. The Doppler frequency estimator includes a filter bank, a non-coherent accumulator, and a maximum value detector. The filter bank filters demodulated signals with respect to frequency bands to provide a plurality of filtered signals. The non-coherent accumulator executes a non-coherent accumulation on each of the filtered signals to provide accumulated signals. The maximum value detector detects a signal having a largest value of the accumulated signals to provide a center frequency of a band corresponding to the detected signal as a Doppler frequency. | ||||||
| 55 | Method and device for operating a precoded MIMO system | US11529311 | 2006-09-29 | US20080080632A1 | 2008-04-03 | Taeyoon Kim; Jayesh H. Kotecha |
| A method is provided for generating precoder data (600), comprising: obtaining transmit power data indicative of a transmit power of a plurality of multiple-input/multiple-output signals (610); obtaining signal quality data, the signal quality data including at least one measure of a quality of the plurality of multiple-input/multiple-output signals (620, 630); obtaining channel data with respect to a wireless channel, the channel data including a measure of respective channel parameters of each of a plurality of channel paths in the wireless channel (620, 630); constraining one or more system performance parameters (640); and determining first and second precoder diagonal values (wA and wB) based on the signal quality data, the transmit power data, the channel data, and the one or more constrained system performance parameters (650). | ||||||
| 56 | Apparatus and method for interference cancellation in wireless mobile stations operating concurrently on two or more air interfaces | US11232346 | 2005-09-21 | US20070066226A1 | 2007-03-22 | Joseph Cleveland; Seong Kim; Lup Loh |
| An apparatus and method for interference cancellation in wireless mobile stations operating concurrently in two or more wireless modes. | ||||||
| 57 | Cross polarization interference canceler and cross polarization interference eliminating apparatus using the same | US794370 | 1997-02-04 | US5844950A | 1998-12-01 | Yoshihito Aono; Takanori Iwamatsu; Toshio Kawasaki |
| A cross polarization interference canceler includes a digital conversion circuit for subjecting a demodulated signal of one channel to an analog-to-digital conversion out of two channels which are independently formed using carriers having the same frequency but having planes of polarization which are mutually orthogonal. An interference cancelling circuit cancels interference caused by the other channel out of the two channels, with respect to the demodulated signal which is digitally converted by the digital conversion circuit. An integrator circuit performs an integration process with respect to the demodulated signal which is digitally converted by the digital conversion circuit so as to provide negative feedback to the digital conversion circuit. | ||||||
| 58 | Cross polarization interference canceler and cross polarization interference eliminating apparatus using the same | US190067 | 1994-02-01 | US5710799A | 1998-01-20 | Kenzo Kobayashi |
| A cross polarization interference canceler includes a digital conversion unit for subjecting a demodulated signal of one channel to an analog-to-digital conversion out of two channels which are independently formed, using carriers having the same frequency but having planes of polarization which are mutually orthogonal. An interference canceling unit is provided for canceling interference caused by the other channel of the two channels, with respect to the demodulated signal which is digitally converted by the digital conversion unit. The canceler further includes an integrator for carrying out an integration process with respect to the demodulated signal which is digitally converted by the digital conversion unit so as to provide a negative feedback to the digital conversion unit. | ||||||
| 59 | Multi-function interactive communications system with circularly/elliptically polarized signal transmission and reception | US420372 | 1995-04-07 | US5701591A | 1997-12-23 | Thomas T. Y. Wong |
| A communications system that uses electromagnetic waves. The communications system preferably operates in the millimeter-wave frequencies, and provides relatively high signal restoration and isolation. The communications system can use polarization diversity to increase the capacity of a channel. Isolation and restoration features in the transceivers eliminate or reduce the effects of precipitation and/or reflection and diffraction from objects, and thus is well-suited for an urban environment. | ||||||
| 60 | Self-cancelling full-duplex RF communication system | US786197 | 1997-01-21 | US5691978A | 1997-11-25 | Gary Robert Kenworthy |
| A method is presented herein whereby both transceivers of a full-duplex RF communications system can use the same spectrum at the same time. Self-interference is cancelled using a combination of antenna placement, analog RF suppression, and digital adaptive filtering. The details of this self-cancelling technique are presented. | ||||||
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