| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 101 | System for compensating polarization errors | US543495 | 1983-10-19 | US4660045A | 1987-04-21 | John F. Clark |
| A method and system is described for use with or in a satellite for compensating for cross coupling of satellite feeder link signals from a first channel of a first linear polarization as received by a first linearly polarized satellite antenna element with adjacent signals from a second channel. The second channel signals are at a generally orthogonal linear polarization. The system includes a second linearly polarized antenna element oriented orthogonal to the first antenna element for sensing the second channel signal, a gain controlled amplifier for reducing the gain of the second channel signal received at the second antenna element in inverse proportion to the sensed amount of cross coupling (depolarization) and adding the reduced gain signals that have been inverted to the first channel signals from said first antenna element. | ||||||
| 102 | Cross-polarization interference cancellation | US704069 | 1985-02-21 | US4606054A | 1986-08-12 | Noach Amitay; Lawrence J. Greenstein |
| A canceller for eliminating the cross-polarization interference in incoming signals having polarizations which are orthogonal to one another is proposed. Each incoming signal is coupled to an associated adaptive filter. Each filter output is then summed with an associated one of the incoming signals which has a polarization orthogonal to that of the filter input signal. The signal sums formed are the canceller output signals. Adjustment of the adaptive filters so as to cancel the cross-polarization interference in each received signal is made in response to the incoming signals and the canceller output signals at selected times. During these times, circuitry for adjusting the adaptive filters examines spectral tones formed by the incoming signals and the canceller output signals. | ||||||
| 103 | Cross-polarization crosstalk canceller | US416112 | 1982-09-09 | US4479258A | 1984-10-23 | Junji Namiki |
| A cross-polarization crosstalk canceller is equipped to receive two polarized waves which are orthogonally crossing each other. The cross-polarization interference is eliminated by multiplying the signal received on one side by a compensating coefficient and adding the resulting product to the signal received on the other side. A discrimination error represents the difference between the reception signal after compensation and the identified value thereof. An adder and a subtractor supplies the sum and the difference between the real part and the imaginary part of the discrimination error. A discriminator detects equality between the absolute values of the real part and the imaginary part of the signal received on the interfering polarized wave side and supplies a control signal depending on the quadrant to which the signal belongs. A switch combines and varies a combination of the signs of the outputs of the adder and subtractor in response to the control signal supplied by the discriminator. A low-pass filter smooths the output of the switching in order to give the compensation coefficient. | ||||||
| 104 | Cross polarization compensating system | US154096 | 1980-05-28 | US4310813A | 1982-01-12 | Hironori Yuuki; Kazunori Inagaki; Makoto Arai; Noboru Baba; Matsuichi Yamada; Hiroshi Kurihara |
| A cross polarization compensating system, in which two elliptically polarized waves of opposite polarities are applied to a cascade connection of two successively connected rotatable 90.degree. phase shifters and an Orthomode (Trademark) transducer. Two cross polarized wave components of the two elliptically polarized waves are detected from the two perpendicularly intersecting output terminals of the Orthomode (Trademark) transducer. Two in-phase components of the same phase as their co-polarized components of the two cross-polarized wave components and two orthogonal components each having a phase difference of 90.degree. from corresponding one of the co-polarized waves of the two cross-polarized wave components are detected from the two output terminals of the Orthomode (Trademark) transducer. One of the two phase shifters is controlled by an addition output of the two in-phase components while the other of the two phase shifters is controlled by a difference output between the two orthogonal components, so that two elliptically polarized waves at the output terminals of the Orthomode (Trademark) transducer are made equal in the cross polarization, and so that a phase difference between the co-polarized wave components and a phase difference between the cross-polarized wave components are made equal in magnitude and opposite in sign. | ||||||
| 105 | Multichannel correlation receiver for determining depolarization of signals along signal propagation paths | US70554 | 1979-08-29 | US4293945A | 1981-10-06 | Ali E. E. Atia; Arnold L. Berman; Christoph Mahle |
| A multichannel correlation receiver at an earth station is provided for determining the depolarization effects of atmospheric conditions on satellite communications. The receiver provides a first co-polarized signal and a second, relatively weak, cross-polarized signal indicative of the depolarization effects, and uses a phase locked loop demodulator to produce a noise free replica of the relatively strong co-polarized signal. This co-polarized signal is highly correlated with the second cross-polarized signal and is mixed therewith to provide a relatively noise free, narrow band signal which has a level indicative of the cross-polarization signal strength for both up-link and down-link propagation paths. The relative signal strengths are recorded on a digital storage means and provide an accurate measure of the depolarization effects of the existing atmospheric conditions. A programmable local oscillator also provides multiple channel capability. | ||||||
| 106 | Adaptive cross-polarization interference cancellation arrangements | US81366 | 1979-10-03 | US4283795A | 1981-08-11 | Michael L. Steinberger |
| The present invention relates to an adaptive cross-polarization cancellation arrangement where a first desired polarized signal and a second interfering orthogonally polarized signal, including cross-polarization components, are concurrently received at an antenna. In the present arrangement, the orthogonally polarized components of the received signal are separated and transmitted along separate paths and recombined after the phase and amplitude of the separated polarized interfering signal sample has been appropriately adjusted for maximally cancelling cross-polarization components thereof in the other path. A feedback path includes circuitry for obtaining a sample of any remaining interfering signal in the recombined output signal, generating a signal representative of the power envelope of such sample, and then generating appropriate control signals in response to such representative power envelope signal to provide improved adjustment of the amplitude and phase of the separated polarized interfering signal sample. | ||||||
| 107 | Automatic polarization decoupling network | US906687 | 1978-05-16 | US4233576A | 1980-11-11 | Guy M. Pelchat |
| An automatic polarization decoupling circuit for decoupling first and second signals originally transmitted with orthogonal polarizations comprising a rotatable quarter-wave plate and a rotatable half-wave plate for linearizing the first signal and rotating its polarization direction to a reference polarization direction, an Orthomode (trademark) transducer for separating energy in the reference polarization direction from energy with a polarization in quadrature thereto and utilizing this quadrature energy as the decoupled second signal. The system further comprises a second Orthomode transducer for recombining the in-phase and quadrature energy separated by the first Orthomode transducer and applying this recombined energy to a second rotatable quarter-wave plate and a second rotatable half-wave plate for linearizing the second signal and rotating its polarization direction to a direction in quadrature with the reference polarization direction. A third Orthomode transducer is provided to separate the energy in this quadrature reference polarization direction from the energy polarized in the reference direction. The reference direction energy separated by this third Orthomode transducer comprises the first signal in decoupled form.This system further includes a correlator for generating control signals from the two decoupled output signals to thereby control the alignments of the first and second quarter-wave plates and the first and second half-wave plates. In respective embodiments of the invention, the correlator employs a phase comparison process, one using pilot signals, the other without pilot signals. | ||||||
| 108 | Adaptive interference reduction system for crosstalk cancellation in a dual polarization system | US891336 | 1978-03-29 | US4220923A | 1980-09-02 | Guy M. Pelchat; Charles A. Baird |
| An adaptive interference reduction system for removing cross talk from a dual polarization system comprising a first adjustable filter for varying the phase and the weight of a first input signal, a second adjustable filter for varying the phase and the weight of a second input signal, a first adder for adding this first input signal and the weighted and phase adjusted output from the second adjustable filter, a second adder for adding the second input signal and the weighted and phase adjusted output from the first adjustable filter, a first noise-to-signal measuring device for generating a signal proportional to the noise-to-signal ratio in the output signal from the first adder, a second noise-to-signal measuring device for generating a signal proportional to the noise-to-signal ratio in the output signal from the second adder, and a dither-type control logic for dithering in-phase and quadrature square-waves in accordance with the signals generated by the first and second noise-to-signal measuring devices to control the first and second adjustable filters. This system is further characterized in that the first and second noise-to-signal measuring devices comprise a slow response control circuit for maintaining the average value of the input signal from the adder at a reference value, and means for filtering this averaged value and detecting the power fluctuations remaining in the signal and generating a signal proportional to these fluctuations. Additionally, the first and second adjustable filters may be structured to have transfer functions across a predetermined bandwidth of W.sub.0 [1+W.sub.1 .omega.+W.sub.2 .omega..sup.2 ] or W.sub.0 [1+W.sub.1 .omega.+W.sub.2 .omega..sup.2 +W.sub.3 .omega..sup.3 ], where W.sub.0 , W.sub.1, W.sub.2 and W.sub.3 are signal weights and .omega. represents the frequency variation of the input signal from its carrier. | ||||||
| 109 | System for compensating for cross polarization coupling | US851810 | 1977-11-15 | US4146893A | 1979-03-27 | Kazunori Inagaki; Yasuo Hirata; Akira Ogawa |
| A system for compensating for cross polarization coupling in a dual-polarization satellite communication system, in which two polarized waves of the same frequency and orthogonal to each other are alternately transmitted as a pilot wave from an earth station at a predetermined period. The same polarized wave components of the two signals received by a communication satellite are sent back to the earth station, so that the sent back signal is received by the earth station. An amplitude ratio and a phase difference between the same polarized wave components of the two signals of the received pilot signal are detected. A communication signal wave to be transmitted from the earth station is formed as an elliptically polarized wave by the use of the detected information, thereby compensating for cross polarization coupling of the communication signal wave caused during propagation between the earth station and the communication satellite. | ||||||
| 110 | Adaptive undesired signal canceller | US776141 | 1977-03-10 | US4105977A | 1978-08-08 | Robert C. Fitting; Gregory H. Piesinger |
| A communications system including a first channel adapted to receive data on a first carrier and a second channel adapted to receive data on a second carrier having a frequency substantially equal to the frequency of the first carrier and polarized approximately orthogonal thereto and wherein degradation in the orthogonality occurs during transmission so that portions of the first carrier appear in the second channel and portions of the second carrier appear in the first channel, a summing device in each channel and apparatus for coupling a portion of the output signal from the summing device in one channel to the input of the summing device in the other channel, in the correct phase relationship and amplitude, so as to cancel the portion of the second carrier appearing in the first channel and the portion of the first carrier appearing in the second channel. | ||||||
| 111 | System for compensating cross-polarized waves to attenuate crosstalk | US663221 | 1976-03-03 | US4090137A | 1978-05-16 | Shoji Soma; Ikuro Sato |
| Polarization distortion experienced by cross-polarized waves is corrected to reduce crosstalk by transmission of pilot signals representing each of the cross-polarized waves, reception of the pilot signals and, based upon their vector values, adjustment of variable phase shifter circuits and variable attenuator circuits to minimize crosstalk effect. Received cross-polarized waves initially undergo phase compensation and are thereafter separated, amplified and then undergo a selected amount of attenuation, based on the received pilot signals, whereupon the attenuated signal of one polarized wave is mixed with the other polarized wave to eliminate the crosstalk components from each of the polarized waves. An additional phase shift adjustment may also be provided for after the cross-polarized waves undergo preamplification. The phase shifting circuits are also adjusted by the control circuits in accordance with the values of the received pilot signals.Preadjustment of cross-polarized waves may be undertaken prior to transmission thereof so that the overall effect of the adjustment of phase and amplitude prior to transmission and the polarization distortion occurring as a result of transmission offset one another to thereby deliver cross-polarized signals to a receiver in which cross-talk is substantially attenuated without further treatment of the cross-polarized waves at the receiver end. The level of phase and amplitude preadjustment at the transmitter is determined by the receipt of pilot signals from the transmitter of the remote transmitter-receiver in communication therewith. | ||||||
| 112 | Lossless network and method for orthogonalizing dual polarized transmission systems | US622360 | 1975-10-14 | US4087818A | 1978-05-02 | Randall William Kreutel, Jr. |
| A technique is disclosed for restoring the orthogonality of dual polarized signals in frequency reuse communications systems. The technique may be characterized as polarization coding at the transmitter and polarization decoding at the receiver. Coding and decoding is accomplished solely by means of phase shifters and sum and difference networks which are lossless in the dissipative sense. The required phase shifts are determined by defining the transmission media in terms of a transmission matrix. All depolarization effects including those attributable to antennas, feeds and media are lumped into this matrix. The transmission matrix may be determined empirically, and the phase shifts fixed for a given transmission media. Where the characteristics of the transmission media vary with time due to atmospheric and other effects as is the usual case, an automatic, closed loop orthogonalization network is employed wherein a pilot signal is generated at one or both ends of the communications system and used to derive error signals for phase shifter control. The technique disclosed is applicable to systems using either linearly or circularly polarized waves. | ||||||
| 113 | Antenna system with automatic depolarization correction | US701422 | 1976-06-30 | US4060808A | 1977-11-29 | Peter Foldes |
| A spectrum reuse antenna system is described for transmitting orthogonally polarized RF waves at one frequency band to a satellite and for receiving orthogonally polarized RF waves from a satellite at a second frequency band through a common antenna. A local generator provides a first control signal which varies as a function of the typical rotation of the polarization of a transmitted wave at the one frequency band travelling through the ionosphere. The local generator also provides a second control signal which varies as a function of the typical rotation of the polarization of a received wave at the second frequency band travelling through the ionosphere. A driven means responsive to the first control signal causes a rotation of the polarization of the transmitted waves to correct for Faraday rotation in the ionosphere and a driven means responsive to the second control signal causes rotation of the polarization angle of the antenna system for the received waves to correct for the Faraday rotation. | ||||||
| 114 | Interference reduction circuit | US446459 | 1974-02-27 | US3963990A | 1976-06-15 | Daniel F. DiFonzo |
| An interference reduction circuit to provide isolation in frequency reuse systems operates on two or more non-isolated signals by cross-coupling the signals such that the interfering signals are cancelled on each channel. In a dual-polarized frequency reuse system, cancellation is effected by adding a sample of an oppositely polarized channel of equal amplitude, but of opposite phase, to the interference. Practical implementation includes closed-loop, digital feedback control to permit dynamic signal-to-interference improvement involving no a priori knowledge of the nature of the incoming signals. The circuit has applications in satellites and earth stations in a communications satellite system. | ||||||
| 115 | Selective use of antenna diversity in MTC devices | US15212923 | 2016-07-18 | US10149246B2 | 2018-12-04 | Vamsi Krishna Chaitanya Komati; Bhaskara Viswanadham Batchu; Raghu Movva |
| A wireless device includes a first antenna and a second antenna that may be used to communicate with a wireless network. The wireless device initiates a traffic call with a wireless network and activates a first antenna to be used to communicate with the wireless network upon initiating the traffic call. The wireless device selectively activates a second antenna, when initiating the traffic call, based at least in part on a usage of the second antenna during a previous traffic call. For example, the wireless device may maintain the second antenna in an inactive state if the second antenna was deactivated during the previous traffic call and/or remained inactive for at least a threshold duration. | ||||||
| 116 | ANALOG BEAMFORMING DEVICES | US15889723 | 2018-02-06 | US20180183509A1 | 2018-06-28 | Jian LUO; Reiner THOMAE; Diego DUPLEICH; Matthias RÖDING; Stephan HAEFNER; Robert MUELLER; Christian SCHNEIDER; Dominik SCHULZ |
| An analog beamforming transmitter includes: a plurality of beamforming transmission circuits coupled in parallel between a signal input and an array of antenna ports, wherein the signal input is configured to receive an analog complex-valued communication signal having an in-phase and a quadrature component, wherein each antenna port of the array of antenna ports is configured to provide a dual-polarized antenna signal having a first polarization component and a second polarization component, wherein each beamforming transmission circuit is coupled between the signal input and a respective antenna port of the array of antenna ports, wherein each beamforming transmission circuit comprises a first coefficient input for receiving a first analog complex-valued beamforming coefficient a set of first analog complex-valued beamforming coefficients and a second coefficient input for receiving a second analog complex-valued beamforming coefficient of a set of second analog complex-valued beamforming coefficients. | ||||||
| 117 | Technique for obtaining the rotation of a wireless device | US14919389 | 2015-10-21 | US09753118B2 | 2017-09-05 | Amichai Sanderovich; Iddo Diukman |
| Certain aspects of the present disclosure relate to methods and apparatus for wireless communication. More particularly, aspects of the present disclosure generally relate to techniques for wireless communications by a first apparatus comprising a first interface for obtaining, via at least one receive antenna, first and second training signals transmitted from a second apparatus via at least first and second transmit antennas having different polarizations, and a processing system configured to determine, based on the first and second training signals, one or more characteristics for different transmit-receive antenna pairs, each pair comprising one of the first and second transmit antennas and the at least one receive antenna, and generate, based on the one or more characteristics, a parameter indicative of a rotation of the first apparatus relative to the second apparatus. | ||||||
| 118 | Method and device for operating a precoded MIMO system | US14146641 | 2014-01-02 | US09596013B2 | 2017-03-14 | Taeyoon Kim; Jayesh H. Kotecha |
| A method is provided for generating precoder data, comprising: obtaining transmit power data indicative of a transmit power of a plurality of multiple-input/multiple-output signals; 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; 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; constraining one or more system performance parameters; 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. | ||||||
| 119 | Single cable including multiple interconnections between two radio units for cross polarization interference cancellation | US14345623 | 2012-09-21 | US08989323B2 | 2015-03-24 | Dong Hong Yom; Ying Shen |
| An outdoor radio communication system comprises a first radio unit, a second radio unit, and a single cable coupling the first radio unit to the second radio unit. Each radio unit includes a downconverter, a radio processor that is communicatively coupled to the downconverter, and a XPIC module. The cable further includes a first twisted-pair of wires for communicatively coupling the first downconverter to the second XPIC module and a second twisted-pair of wires for communicatively coupling the second downconverter to the first XPIC module. The first XPIC module generates a first reference signal using a signal from the second downconverter to cancel cross-polarization interference in an output signal of the first radio processor. Similarly, the second XPIC module generates a second reference signal using a signal from the first downconverter to cancel cross-polarization interference in an output signal of the second radio processor. | ||||||
| 120 | Wireless communication apparatus, wireless communication system and wireless communication method | US14252000 | 2014-04-14 | US08953704B2 | 2015-02-10 | 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. | ||||||
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