WO2011082484A1 - Système et procédé d'annulation active du brouillage - Google Patents

Système et procédé d'annulation active du brouillage Download PDF

Info

Publication number
WO2011082484A1
WO2011082484A1 PCT/CA2011/000015 CA2011000015W WO2011082484A1 WO 2011082484 A1 WO2011082484 A1 WO 2011082484A1 CA 2011000015 W CA2011000015 W CA 2011000015W WO 2011082484 A1 WO2011082484 A1 WO 2011082484A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
antenna
interference
cancellation
interfering
Prior art date
Application number
PCT/CA2011/000015
Other languages
English (en)
Inventor
Colin Sutherland
James Gary Griffiths
Tomasz Swierczynski
Original Assignee
Ems Technologies Canada, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ems Technologies Canada, Ltd. filed Critical Ems Technologies Canada, Ltd.
Publication of WO2011082484A1 publication Critical patent/WO2011082484A1/fr

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06Receivers
    • H04B1/10Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/109Means associated with receiver for limiting or suppressing noise or interference by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/3805Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving with built-in auxiliary receivers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02Terminal devices
    • H04W88/06Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • the present invention pertains to the field of communications, and in particular, to an active interference cancellation system and method.
  • signal interference can be a relatively common problem which, depending on the system and the nature of the interference, can be reasonably mitigated to achieve a satisfactory end signal reception quality.
  • one such application may include the co-implementation of distinct wireless communication systems by a common communication device, such as a laptop or cellular telephone, or again the co-implementation of one or more wireless communication systems and a global positioning system (GPS) in GPS-enabled communication devices.
  • GPS global positioning system
  • interference is generally experienced due to substantial overlap between the communication bands of respective communication services, whereas in the later example, relatively strong transmissions in a given wireless communication band may effectively drown out or saturate a GPS receiver configured for the reception of relatively weak GPS satellite signals.
  • time separation wherein transmissions by an otherwise interfering system are limited to periods between active receptions by a co-implemented system
  • frequency separation/filtering wherein appropriate guard bands are implemented between the transmission and reception bands of otherwise interfering systems so to allow for effective filtering
  • passive interference cancellation wherein a portion of an interfering transmission signal is effectively subtracted from a susceptible received signal.
  • communication bands associated with respective systems are generally preset and, where a sufficiently broad guard band is not allocated between respective communication systems, the intentional introduction of such guard bands, for example by reducing the operational bandwidth of a given system, would result in a reduction in the operational characteristics and throughput of such systems, which may not be of particular interest.
  • passive interference cancellation can provide a solution that overcomes some of the above disadvantages, such solution cannot generally accommodate for variations in the operation of co-implemented systems, and therefore, may not be sufficient in providing a useful effect.
  • An object of the invention is to provide an active interference cancellation system and method.
  • the kit comprising: a cancellation signal generation module for generating a cancellation signal at least in part as a function of an interference signal from the transmitting antenna; a signal combination module for combining said cancellation signal with a received signal to provide an interference compensation therefor and generate a feedback signal; and a control signal generation module for generating a control signal at least in part as a function of said feedback signal; wherein said cancellation signal is generated at least in part in response to said control signal.
  • FIG. 1 is a high-level diagrammatic representation of an active interference cancellation system, in accordance with one embodiment of the invention.
  • Figure 2 is a diagrammatic representation of an active interference cancellation system, in accordance with one embodiment of the invention.
  • Figure 3 is a diagrammatic representation of an equalizer of an active interference cancellation system, in accordance with one embodiment of the invention.
  • Figure 4 is a diagrammatic representation of an optional radio frequency (RF) cross- correlator of an active interference cancellation system, in accordance with one embodiment of the invention.
  • RF radio frequency
  • FIG. 5 is a diagrammatic representation of an optional radio frequency (RF) cross- correlator of an active interference cancellation system, in accordance with another embodiment of the invention.
  • RF radio frequency
  • Figure 6 is a diagrammatic representation of an optional intermediate frequency (IF) cross-correlator of an active interference cancellation system, in accordance with one embodiment of the invention.
  • Figure 7 is a diagrammatic representation of an optional intermediate frequency (IF) cross-correlator of an active interference cancellation system, in accordance with another embodiment of the invention.
  • IF intermediate frequency
  • Figure 8 is a diagrammatic representation of an active interference cancellation system, in accordance with another embodiment of the invention.
  • Figure 9 is a plot of measured characteristics of an exemplary coupling path between antennas of distinct communication systems, in accordance with one embodiment of the invention, showing frequency-dependent log magnitude and residual phase variations generated thereby for an exemplary aircraft communication systems configuration.
  • Figure 10 is a simplified plot of characteristics of an interfering signal transmitted by an interfering communication system, relative to a distinct signal intended for reception by a distinct communication system susceptible to the interfering signal, in accordance with one embodiment of the invention.
  • the distinct communication systems comprise an interfering system comprising a transmitter and transmitting antenna, and a susceptible system comprising a receiver and receiving antenna, wherein the transmissions of the interfering system interfere with the receiver and receiving antenna, and wherein at least one of the transmitting antenna and the receiving antenna comprises a directional antenna dynamically reoriented in operation.
  • the system and method dynamically process interference compensation and external system and configuration data to adaptively control the cancellation of interference signals from the received signals.
  • the system 100 is generally configured to mitigate interference between distinct communication systems, an interfering one of which comprising a transmitter and transmitting antenna (i.e. interfering antenna 102) whose transmissions interfere with a susceptible receiver 104 and receiving antenna 106 of the other.
  • interfering antenna 102 a transmitter and transmitting antenna
  • interference detected at the receiving antenna 106 may be characterized, at least in part, as a function of the interfering transmissions and a particular interference path coupling the respective antennas of the distinct communication systems, depicted herein as coupling function 108.
  • the system 100 generally comprises a cancellation signal generation module 110 receiving as input an interference signal 112 at least partially representative of the interfering transmissions (e.g. a sample of these transmissions), for generating a cancellation signal 114 as a function thereof in response to a control signal 116, for example provided by control module 118.
  • a signal combination module e.g. combiner 120
  • communicatively coupled to the cancellation signal generation module 110 enables combination of the generated cancellation signal 114 with a received signal 122 from the receiving antenna 106, to provide interference compensation therefor.
  • the cancellation signal 114 will comprise at least one of a time- shifted, a phase-shifted and an amplitude shifted component of the interference signal (i.e. represented by an interference cancellation function ⁇ CANCEL), namely representative of the particular interference path coupling the communication systems' antennas.
  • the cancellation signal generation module 110 adaptively operates on the interference signal 112 to effectively mimic the characteristic path between antennas (e.g. F CO U P L I N G ), and apply an inverse function thereto for applying appropriate interference cancellation (e.g.
  • F C ANCEL should be roughly equal to the inverse of F CO U PL ING)-
  • the cancellation signal generation module 110 is dynamically implemented in response to the control signal 116 generated by the control module 118, which is at least in part configured to assess an effectiveness of the interference compensation and adjust the control signal accordingly, namely effectively adjust F C A N CEL-
  • the system comprises a sampling module or coupler 124 for sampling the compensated signal 129, e.g. generating feedback signal 126 for input to the control module 118, which is further configured to assess a quality thereof, e.g. assess an effectiveness of the interference cancellation applied thereto.
  • the control module 118 may further receive as input external data, either selected based on preset operational characteristics and/or dynamically updated in response to operational characteristic variations, for example.
  • the control module 118 receives two kinds of input: open-loop inputs (e.g. external input(s) 125 provided directly or via selection module 127) defining the current state of the system, generally with values of stored parameters or the like; and feedback values obtained by sampling the compensated signal 129 at the input to the receiver 104.
  • the open-loop inputs may assist with initial optimization and/or tracking rapid changes, whereas the feedback values may indicate how effective the current settings are in providing adequate compensation.
  • the cancellation signal is thus continuously updated in an attempt to minimize the impact of interference (e.g. noise) in the sampled feedback signal.
  • At least one of the transmitting and receiving antennas comprises a directional antenna that is dynamically reoriented during operation, for example in tracking or selectively transmitting a signal in a particular direction.
  • directional antennae may include, but are not limited to, different types of antennae or antenna arrays configured to radiate greater power in one or more directions, wherein a general spatial orientation of a beam generated or selectively received thereby can be reoriented by mechanical and/or electrical means (e.g. phased array). As this antenna is reoriented, so will the effective coupling path between antennas be modified, thereby requiring responsive adjustment of the cancellation signal to maintain sufficient interference suppression.
  • the system 100 is configured to generate the control signal both as a function of a measure of interference compensation effectiveness and variations therein affected, for example, by reorientation of the directional antenna, thereby providing adaptive control of the cancellation signal responsive to such reorientations.
  • adaptive control may be provided solely on the basis of the feedback signal, or further on the basis of external data 125 provided to the control module 118 in providing real-time antenna positional/directional data, which data can be used to accelerate response to such variations in the cancellation signal.
  • the control signal may be automatically adjusted as a function of preset antenna orientation-specific compensation parameters providing increased system responsiveness to antenna reorientations as compared to that available solely through the feedback loop. The feedback loop could then provide for further fine tuning of the control signal parameters.
  • One example for which the above system may be considered consists of the co- implementation of two satellite communication systems suitable for use with airborne systems, for example as offered by InmarsatTM PLC and IridiumTM Communications Inc. While these services are somewhat complementary, it is sometimes desirable to provide both services on the same aircraft. However, the frequency allocations for the two services make this problematic, i.e. there is no guard band between the upper edge of the IridiumTM band and the lower edge of the InmarsatTM uplink band, the boundary being located at 1626.5 MHz. As a consequence, mutual interference may occur, particularly in the Inmarsat to Iridium direction due to the considerably higher effective isotropic radiated power (EIRP) used by the InmarsatTM transceiver.
  • EIRP effective isotropic radiated power
  • the system can be used to provide active interference cancellation to remove the unwanted InmarsatTM signal from the signals received by the IridiumTM transceiver.
  • the system can address interference arising due to operation of two different services, each operating in one of two contiguous non overlapping bands, with both transceiver and antenna sets collocated on one aircraft, for example.
  • the system may further be adjusted to address both broadband noise (e.g. appearing in the pass band of the IridiumTM receiver and originating from the InmarsatTM system transmitter) and specific modulated carriers (e.g.
  • the InmarsatTM system is generally provided with a directional antenna whose beam orientation is continuously adjusted in operation to maintain reliable satellite communications.
  • the InmarsatTM antenna will generally seek to maintain a fix on the position of an associated communication satellite, and thus, its orientation will be adjusted as a function of the aircraft's relative position and orientation (e.g. longitude, latitude, altitude, pitch, roll and yaw).
  • the physical positioning of InmarsatTM' s directional antenna relative to the IridiumTM antenna which generally consists of an omnidirectional antenna in most implementations, may be fixed by the aircraft structure, the reorientation of the InmarsatTM antenna in operation may have noticeable consequences on the extent and characteristics of interference generated by InmarsatTM transmissions in IridiumTM signals.
  • reorientation of the InmarsatTM antenna in this example representing the interfering antenna 102, may have a non-negligible impact on FCOUPLING, thereby requiring appropriate adjustment of FCANCEL if appropriate interference compensation is to be provided.
  • co-implementation of distinct communication systems operatively mounted on other vehicular devices can be considered as well as other applications where at least one of the systems of interest is configured to dynamically reorient its communication antenna, thereby dynamically altering a coupling path between respective system antennas.
  • Other examples may also include coupling between a directional communication system and a co-implemented global positioning system (GPS), simultaneously reorientable communication systems, and the like, as will be readily appreciated by the person of ordinary skill in the art.
  • GPS global positioning system
  • an InmarsatTM Satellite Data Unit (SDU) 230 generates a signal to be transmitted at low power, which is amplified by a High Power Amplifier (HP A) 232 and fed to a directional Inmarsat antenna 202 (e.g. the interfering antenna) via a Diplexer Low Noise Amplifier (DLNA) 234. Only the transmit signal path is shown for clarity.
  • HP A High Power Amplifier
  • DLNA Diplexer Low Noise Amplifier
  • an omnidirectional IridiumTM antenna 206 is mounted at a distance from the InmarsatTM antenna 202 (e.g. commonly defining an intricate coupling path between the two antennas resulting in multiple signal reflections/paths, the combined effect of which effectively represented by FCOUPLING), an ⁇ communicates received signals to an IridiumTM Transceiver 204 (e.g. the susceptible receiver), which received signals originally comprise a combination of the desired IridiumTM signal and an InmarsatTM interference component.
  • an IridiumTM Transceiver 204 e.g. the susceptible receiver
  • a sample of the InmarsatTM transmitter signal (e.g. interference signal 212) is processed by a cancellation signal generation module, provided herein by adjustable equalizer 210, configured to apply a cancellation function (e.g. FCANCEL) to this signal that attempts to mimic the characteristics of the signal path between the antennas (e.g. FCOUPLING), and thereby generate a cancellation signal appropriate for interference compensation, namely where FCANCEL substantially represents the inverse of FCOUPLING- Accordingly, the output of the equalizer 210 is applied to a combiner (coupler) 220, which sums it with the signal from the receiving antenna 206 to provide interference compensation resulting, if the equalizer is adequately adjusted, in improving reception of the wanted IridiumTM signal.
  • a cancellation function e.g. FCANCEL
  • the propagation delay between the antennas (e.g. path loss 236), which can generally yield a steep slope in the phase characteristics of the interfering transmissions, may be compensated for by interposing a substantially equivalent delay 238 in the communication path of the interference signal 212. Accordingly, the equalizer 210 may then be configured to provide a match for residual deviations from linear phase.
  • the adaptation controller 218 is configured to receive as input feedback values sampled from the compensated IridiumTM signal (e.g. via coupler 224) so to provide equalizer adjustments as a function of a measure of the effectiveness of interference compensation.
  • a measure as to the effectiveness of interference compensation can be implemented in real-time, wherein parameters guiding various aspects of the generated cancellation signal (e.g. phase, amplitude, delay, etc.) can be modified accordingly so to improve or maximize the interference compensation provided by the system.
  • parameters guiding various aspects of the generated cancellation signal e.g. phase, amplitude, delay, etc.
  • adaptation controller 218 can optionally be further configured to receive as input external data 225 provided to improve the system's responsiveness and/or efficiency, which may include, but is not limited to information such as a beam pointing direction of the interfering antenna (e.g. the InmarsatTM antenna in this example). It will be appreciated that should the receiving antenna alternatively or additionally comprise a directional and/or reorientable antenna, information related to the orientation of this receiving antenna may also be provided in adapting the active cancellation system to current conditions. Furthermore, optional signal quality data 240, in this example provided by the IridiumTM transceiver, may also be taken into account in producing an adequate control signal for controlling the equalizer function.
  • the feedback signal 226 is processed directly by the adaptation controller.
  • the feedback signal 226 may rather first be cross-correlated by cross-correlator 242 with the interference signal 212 in order to improve the sensitivity of the feedback path.
  • the controller 218 attempts to reduce or minimize the power of the feedback signal. Since there is no significant wanted signal contained in the injected cancellation signal 214, this action generally results in reducing or minimizing the interference level at the IridiumTM receiver input.
  • different approaches may be implemented in manipulating the feedback signal such that, upon minimization, interference compensation is directed to the most significant component(s) of the interfering signal.
  • interference compensation may be maximized for such signal frequencies, rather than maximized for potentially larger interference contributions at frequencies of lesser significance or having a reduced impact on the overall performance of the susceptible system.
  • a particular constraint on the design of the adaptive control system for a particular application can arise from the nature of the interfering signal in this application.
  • a transmitter typically produces a strong communication signal that occupies an assigned channel along with a broad spectrum of noise at a much lower level, as shown for example by the interfering signal 800 of Figure 10.
  • both the communication signal e.g. peak transmitted signal
  • the associated noise spectrum are problematic, albeit at differing levels.
  • the transmitter noise floor e.g. noise sidebands 820
  • the transmitter noise floor extends into the adjacent receiver band of the susceptible receiver (e.g.
  • susceptible signal 850 the transmitted communication signal 800 causes compression and cross-modulation in the front-end of the susceptible receiver, which can in fact be the case in the example of the InmarsatTM and IridiumTM transceivers.
  • the more serious mode of interference may arise from the broadband noise floor, which, while of lower amplitude, may in fact be more relevant to interference cancellation than the stronger communication signal peak.
  • the system may be further configured to provide greater suppression of the noise floor, possibly at the expense of reduced suppression of the actual transmitter signal peak.
  • the adaptive controller will naturally respond to the strongest components of the feedback signal, which in some embodiments, may lead to the most significant interference cancellation.
  • the feedback signal may be filtered to attenuate stronger and less significant components to allow the noise floor to dominate the adaptation process, for example.
  • a bandpass filter (not shown) centered on the Iridium band may be placed in the feedback path to favourably modify the response of the adaptation controller. While this approach may be less effective in the event that the dominant interfering signal is very close to the edge of the IridiumTM band, the frequency separation in this situation would be sufficiently small that adequate suppression could be attained even when the transmitted communication signal peak dominates the adaptation process.
  • constraints relevant in the design of embodiments specific to a particular application may also include the type and characteristics of the particular transceivers and/or communication systems considered.
  • the embodiment of Figure 2 allows certain constraints particular to this example to be overcome, which constraints may also be applicable in a variety of other applications. Namely, while the implementation of interference cancellation and adaptation can, in some applications, be more easily implemented in the digital domain, as in the embodiment described below with reference to Figure 8, the present example does not provide ready access to the inner workings of the IridiumTM system, and therefore, some if not all processes involved in interference cancellation may be more readily accessible and/or implemented in the RF domain (e.g. analog signal processing), which implementation can be readily achieved using the system design depicted in Figure 2.
  • the susceptible receiver is externally supplied and operated as a "black box”
  • cancellation may be more readily performed in the RF domain, with the resulting compensated RF signal applied directly to the receiver.
  • the C ANCEL or equalizer function can be implemented as an analog equalizer, typically with voltage-controlled elements to implement the required amplitude and phase characteristics, for example, thereby generating an analog interference cancellation signal that can be coupled in the analog domain with a received signal prior to processing by the susceptible receiver.
  • Figure 9 shows the measured frequency-dependent characteristics of an unwanted coupling path between a typical pair of antennas (following the above example), wherein the upper trace 700 is the log magnitude of the unwanted signal and the lower trace 750 is its phase after removal of the slope due to propagation delay.
  • sufficient complexity in the equalizer is required in order to sufficiently mimic these characteristics.
  • Figure 3 provides an example of an equalizer, generally referred to using the numeral 300, and in accordance with one embodiment of the invention, that is usable in the present context and whose level of complexity can be designed to adequately reflect the level of complexity observed in the interference coupling path and the level of compensation accuracy/efficiency required by the application at hand.
  • the interference signal 312 is divided by an n-way power divider 350 and directed to a bank of bandpass filters 310, these filters having center frequencies disposed throughout the band of interest.
  • Each filter has an associated variable attenuator 320 and variable phase-shifter 330, thereby providing control over its amplitude and phase contribution to the overall frequency characteristic.
  • These adjusted signal components are then recombined by another n-way power divider 360 and output as cancellation signal 314.
  • a dedicated inversion function may be implemented independently, it may also be achieved by selecting suitable settings for the phase-shifters 330. By choice of an appropriate number of filters with suitable bandwidths, the interference path may be modeled to the desired degree of accuracy. While a similar parametric equalizer could be implemented using filters having variable center frequencies and/or bandwidths, such implementation is not as easily achieved at microwave frequencies. Such implementations may nonetheless be considered herein and are therefor not meant to depart from the general scope and nature of the present disclosure.
  • Figure 4 provides an example of an optional RF cross-correlator, generally referred to using the numeral 400, and in accordance with one embodiment of the invention, that may be used in preconditioning the sample or feedback signal 426 (e.g. signal 226 of Figure 2) for processing by the control module.
  • the provision of a cross- correlator may yield a less noisy feedback signal for the adaptation controller than is available by simply using the total power of the feedback signal sampled from the compensated signal. While the latter may be more easily implemented, in applications where a limited signal-to-noise ratio is available, direct feedback signal processing may not permit sufficiently rapid adaptation, particularly for a system configured to adapt to dynamically changing interference conditions, such as provided in the event of antenna reorientation.
  • both the sample or feedback signal 426 and interference signal 412 are split and provided to respective analog multipliers 460, wherein the interference signal 412 is divided by quadrature phase shift network 462 thereby phase-shifting one of the resulting interference signals by 90 degrees relative to the other.
  • Each signal output from the respective multipliers 460 is then processed through a low pass filter 464 to derive an error magnitude output signal in complex form comprising an in-phase (I) output component and a quadrature (Q) output component.
  • the derived complex signal generally retains the phase information as well as the magnitude of the input signals, and may form the basis for further deriving an error magnitude value for processing by the control module.
  • Figure 5 provides another embodiment of the optional RF cross-correlator.
  • sample/feedback and interference signals are processed in a manner similar to what has been described above in reference to Figure 4.
  • each signal output from the respective multipliers 460 is processed through a low pass filter 464 and squaring function 466 before being summed by summer 468 and processed by a square root function 470, thereby providing an error magnitude value for processing by the control module (not shown).
  • Figure 6 provides an example of an optional IF cross-correlator, generally referred to using the numeral 500, and in accordance with another embodiment of the invention.
  • the interference (512) and sample or feedback (526) signals are first down-converted to an intermediate frequency (e.g. via local oscillator 572 and mixers 574, and IF filters 576) before reaching the analog multipliers 560, thereby bringing the multiplier operating frequency down to a range that is more readily manageable.
  • This approach also provides the opportunity to perform the 90 degree split on the interference signal on a fixed frequency rather than the entire RF band, which can be relatively simpler to implement.
  • the process then proceeds through low pass filters 564, respective analog to digital converters 565 to derive an error magnitude output signal in complex form comprising an in-phase (I) output component and a quadrature (Q) output component.
  • the derived complex signal generally retains the phase information as well as the magnitude of the input signals, and may form the basis for further deriving an error magnitude value for processing by the control module.
  • Figure 7 provides another embodiment of the optional IF cross-correlator.
  • sample/feedback and interference signals are processed in a manner similar to what has been described above in reference to Figure 6.
  • the signals proceed through low pass filters 564, respective analog to digital converters 565 and squaring functions 566, before being summed by summer 568 and processed by square root function 570 to provide an error magnitude value for processing by the control module (not shown).
  • the control module not shown.
  • an InmarsatTM Satellite Data Unit (SDU) 630 generates a signal to be transmitted at low power, which is amplified by a High Power Amplifier (HPA) 632 and fed to a directional InmarsatTM antenna 602 (e.g.
  • HPA High Power Amplifier
  • an omnidirectional IridiumTM antenna 606 is mounted at a distance from the Inmarsat antenna 602, and communicates received signals to an IridiumTM Transceiver 604 (e.g. the susceptible receiver), which received signals originally comprise a combination of the desired Iridium signal and an Inmarsat interference component.
  • IridiumTM Transceiver 604 e.g. the susceptible receiver
  • received signals originally comprise a combination of the desired Iridium signal and an Inmarsat interference component.
  • a digitized sample of the InmarsatTM transmitter signal e.g.
  • interference signal 612 processed by analog-to-digital converter 680 is processed by a cancellation signal generation module, provided herein by a finite impulse response (FIR) filter 610, configured to apply a cancellation function (e.g. FCANCEL) to this signal that attempts to mimic the characteristics of the signal path between the antennas (e.g.
  • FIR finite impulse response
  • FCOUPLING FCOUPLING
  • FCANCEL substantially represents the inverse of FCOUPLING-
  • the digital output of the FIR filter 610 is converted back to analog by digital-to-analog converter 682, which analog cancellation signal 614 is then applied to a combiner (coupler) 620, which sums it with the signal from the receiving antenna 606 to provide interference compensation resulting, if the FIR filter is adequately adjusted, in improving reception of the wanted IridiumTM signal.
  • the adaptation controller 618 is configured to receive as input feedback values sampled from the compensated IridiumTM signal (e.g. via coupler 624 and analog-to-digital converter 684) so to provide filter adjustments as a function of a measure of the effectiveness of interference compensation.
  • samples of the compensated signal 626 may be fed to the adaptation controller 618, which can be configured to run a least mean square (LMS) algorithm or the like and thereby, as a result, adjust the tap weights at each sample interval in an attempt to improve the cancellation.
  • LMS least mean square
  • External data may also be used in adjusting control parameters.
  • the herein described active interference cancellation systems and methods may provide, according to different embodiments of the invention, a number of operational benefits and/or advantages.
  • the system can be self calibrating, thereby allowing for the automatic response to different interference levels generated in a variety of situations.
  • little to no user intervention is generally required, as the system can adaptively adjust itself to changing interference conditions.
  • preset configuration parameters may provide for increased responsiveness to known or predictable communication system variations (e.g. antenna reorientation, environmental conditions, etc.).
  • the system may be configured to self-adjust based on historical performance values or recalibrations, and thereby further improve the system's responsiveness and performance. This self calibration may further allow a system or system design to be adapted to different applications and/or installations without significant system redesign.
  • the system may be implemented independently of the two communication systems at hand, wherein appropriate input and output signals may be operatively coupled to each system in providing adaptive interference cancellation without accessing the inner workings of either system.
  • This feature may be particularly useful in embodiments where access to the inner workings of one or both communication systems is prohibited (e.g. as is the case for the IridiumTM system).
  • the adaptive interference cancellation system may be configured to leverage some of the functionality of this system and/or provide for greater integration of the compensation system within such inner workings, for example.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)

Abstract

L'invention concerne un système et un procédé destinés à lutter contre les brouillages se produisant entre des systèmes de communication distincts, celui d'entre eux qui produit un brouillage comprenant un émetteur et une antenne d'émission dont les émissions brouillent un récepteur et une antenne de réception exposés d'un autre d'entre eux, au moins l'une de l'antenne d'émission et de l'antenne de réception comprenant une antenne directionnelle réorientée dynamiquement lors du fonctionnement. De manière générale, le système et le procédé sont commandés de manière adaptative en fonction d'une mesure de l'efficacité d'une compensation du brouillage et de sa variation produite par une réorientation de ladite antenne directionnelle.
PCT/CA2011/000015 2010-01-06 2011-01-06 Système et procédé d'annulation active du brouillage WO2011082484A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US29259810P 2010-01-06 2010-01-06
US61/292,598 2010-01-06

Publications (1)

Publication Number Publication Date
WO2011082484A1 true WO2011082484A1 (fr) 2011-07-14

Family

ID=44305149

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA2011/000015 WO2011082484A1 (fr) 2010-01-06 2011-01-06 Système et procédé d'annulation active du brouillage

Country Status (1)

Country Link
WO (1) WO2011082484A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9590673B2 (en) 2015-01-20 2017-03-07 Qualcomm Incorporated Switched, simultaneous and cascaded interference cancellation
CN106716851A (zh) * 2015-05-30 2017-05-24 华为技术有限公司 干扰信号抵消装置及方法
DE102016110596A1 (de) * 2016-06-08 2017-12-14 Technische Universität Dortmund Aktive Störunterdrückungseinrichtung
DE102018001051A1 (de) 2018-02-09 2019-08-14 Leopold Kostal Gmbh & Co. Kg Verfahren zur Reduktion eines elektromagnetischen Störsignals eines getaktet angesteuerten elektronischen Systems
US10616768B2 (en) * 2016-06-05 2020-04-07 Iridium Satellite Llc Wireless communication with interference mitigation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3699444A (en) * 1969-02-17 1972-10-17 American Nucleonics Corp Interference cancellation system
US20040082311A1 (en) * 2002-10-28 2004-04-29 Shiu Da-Shan Utilizing speed and position information to select an operational mode in a wireless communication system
US20040146237A1 (en) * 2003-01-29 2004-07-29 Taylor Geoff W. Interference cancellation system employing photonic sigma delta modulation and optical true time delay
US20050195889A1 (en) * 2004-03-05 2005-09-08 Grant Stephen J. Successive interference cancellation in a generalized RAKE receiver architecture
US20080146183A1 (en) * 2003-11-17 2008-06-19 Quellan, Inc. Method and system for antenna interference cancellation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3699444A (en) * 1969-02-17 1972-10-17 American Nucleonics Corp Interference cancellation system
US20040082311A1 (en) * 2002-10-28 2004-04-29 Shiu Da-Shan Utilizing speed and position information to select an operational mode in a wireless communication system
US20040146237A1 (en) * 2003-01-29 2004-07-29 Taylor Geoff W. Interference cancellation system employing photonic sigma delta modulation and optical true time delay
US20080146183A1 (en) * 2003-11-17 2008-06-19 Quellan, Inc. Method and system for antenna interference cancellation
US20050195889A1 (en) * 2004-03-05 2005-09-08 Grant Stephen J. Successive interference cancellation in a generalized RAKE receiver architecture

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9590673B2 (en) 2015-01-20 2017-03-07 Qualcomm Incorporated Switched, simultaneous and cascaded interference cancellation
CN106716851A (zh) * 2015-05-30 2017-05-24 华为技术有限公司 干扰信号抵消装置及方法
EP3297172A4 (fr) * 2015-05-30 2018-07-25 Huawei Technologies Co., Ltd. Dispositif et procédé d'annulation de signal brouilleur
CN106716851B (zh) * 2015-05-30 2020-02-14 华为技术有限公司 干扰信号抵消装置及方法
US10616768B2 (en) * 2016-06-05 2020-04-07 Iridium Satellite Llc Wireless communication with interference mitigation
US11444688B2 (en) 2016-06-05 2022-09-13 Iridium Satellite Llc Wireless communication with interference mitigation
DE102016110596A1 (de) * 2016-06-08 2017-12-14 Technische Universität Dortmund Aktive Störunterdrückungseinrichtung
DE102016110596B4 (de) 2016-06-08 2019-12-19 Technische Universität Dortmund Aktive Störunterdrückungseinrichtung, Verfahren zur aktiven Störunterdrückung
DE102018001051A1 (de) 2018-02-09 2019-08-14 Leopold Kostal Gmbh & Co. Kg Verfahren zur Reduktion eines elektromagnetischen Störsignals eines getaktet angesteuerten elektronischen Systems

Similar Documents

Publication Publication Date Title
US10779243B2 (en) Wireless communication with interference mitigation
US11444688B2 (en) Wireless communication with interference mitigation
US10218490B1 (en) Wideband simultaneous transmit and receive (STAR) subsystem
US9479214B2 (en) Wideband active radio frequency interference cancellation system
EP2715947B1 (fr) Système d'antenne distribué à large bande comprenant un sous-système isolateur non duplexeur
AU2006255681B2 (en) Technique for compensation of transmit leakage in radar receiver
US7706755B2 (en) Digital, down-converted RF residual leakage signal mitigating RF residual leakage
US7907891B2 (en) Physical layer repeater utilizing real time measurement metrics and adaptive antenna array to promote signal integrity and amplification
KR100746577B1 (ko) 간섭 제거형 무선 중계기
US20110256857A1 (en) Systems and Methods for Improving Antenna Isolation Using Signal Cancellation
EP3042451B1 (fr) Annuleur à action directe
US10649067B1 (en) Simultaneous transmit and receive (STAR) subsystem with external noise canceller
US20170141807A1 (en) High Performance PIM Cancellation With Feedback
WO2011082484A1 (fr) Système et procédé d'annulation active du brouillage
US20120249212A1 (en) External mounted amplifiers with active interference cancelation using diversity antennas
KR101156131B1 (ko) 위성 중계기에서 간섭제거 방법 및 장치
US20240204811A1 (en) Wireless communication with interference mitigation
US20140113569A1 (en) Cross polarization interference cancellation device and cross polarization interference cancellation method
Collins et al. Practical insights on full-duplex personal wireless communications gained from operational experience in the satellite environment
US20180006673A1 (en) Method and system for suppressing a parasite signal received by a satellite payload
Pärlin et al. Digitally assisted analog mitigation of narrowband periodic interference
US20170192099A1 (en) Apparatus and method for reducing harmonic interference to gps signal reception
CN115955258A (zh) 一种基于参考波形的导航信号收发隔离自适应对消方法
JP2011199584A (ja) 無線受信装置および無線通信システム

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11731642

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 11731642

Country of ref document: EP

Kind code of ref document: A1