478 results about "Interference reduction" patented technology

White space devices (102) are unlicensed radiofrequency devices that must have certain capabilities in order to avoid harmful interference to licensed operations. In general, they must be location-aware, must be able to contact a geolocation database (108) and may not operate without receiving a positive control signal. A number of white space devices can use a control channel (104) to communicate with a control station (106). In addition to meeting the geolocation and positive control requirements given above, the control station coordinates the channels used by the white space devices so as to minimize (308) their aggregate interference. In one embodiment, a control channel uses a separate frequency band with high availability and reliability but low throughput. Embodiments optimize channel assignments where the potential interference depends on the mutual distances between the white space devices. Potential interference reductions of 20-30 dB have been found in simulations. Other embodiments are disclosed.

A method and receiver are disclosed for mitigating or substantially canceling signal interference between signals detected at the receiver. Once a presumed interfering signal(s) is acquired, parameters are determined that allow the interferer(s) to be modeled. The phase invariance of the process eliminates the need to acquire the interferer's phase. An orthogonal projection (for projecting onto a detection subspace which is orthogonal to a subspace spanned by the interferer(s)) is applied to the composite of all signals (y) for thereby projecting y onto the detection subspace. The interference subspace is non-orthogonal to a representation of desired (but interfered) signal of the composite signals. With the receiver properly equipped to perform this projection operation, interfering signals, multipath, multipath-like, and structured jamming signals can be effectively diminished.

The present invention relates to a device and a method for extracting information from detected characteristic signals. A data stream (76, 78, 80, 82) derivable from electromagnetic radiation (14) emitted or reflected by an object (11) is received and a plurality of characteristic index elements (50) varying over time can be extracted therefrom. The index elements (50) comprise physiological information (48) indicative of at least one at least partially periodic vital signal (12), and a disturbing signal component (58). For eliminating the disturbing signal component (58) to a great extent, the characteristic index elements (50) can be projected to a disturbance-reduced index element (64) having a distinct orientation in relation to a presumed orientation of the disturbing signal component (58). The disturbance-reduced index element (64) is chosen so as to reflect a dominant main orientation and length of the disturbing signal component (58) over time. Consequently, the mainly genuine physiological information (48) extracted from the data stream (76, 78, 80, 82) in this way can be utilized for determining the at least one at least partially periodic vital signal (12).

A mobile station (104) operates in a region where an incumbent operator (110) is transmitting. The secondary station transmits at a frequency similar to that of the incumbent operator's signal. The incumbent operator transmits using a particular polarization (113). To reduce interference, the secondary station selects one of a plurality of antennas of the secondary station which has a low matching polarization with that of the incumbent signal.

A base station communicates with mobile terminals existing within a subordinate cell, and in addition executes control to reduce interference from mobile terminals existing within adjacent cells. The base station measures the total interference power received from mobile terminals in all adjacent cells, and if the total interference power is greater than a preset value, issues a request to the base stations of all adjacent cells to reduce interference. The base station which has received the interference reduction request discriminates mobile terminals which impart interference to the base station which is the source of the interference reduction request, and reduces interference by either temporarily lowering the uplink data transmission rate or temporarily halting uplink data transmission for such mobile terminals.

In wireless system, a group of Basestations (BTSs) can be managed by a centralized network management identity or can be self-organized by communicating with each other via wireless air-interfaces or wired interfaces. One such example are Femtocell systems. When the BTSs are using the same frequency for transmitting and receiving with relatively large transmitting power and when they are closer to each other, performance of such a system and user throughput or QoS (Quality of Service) gets degraded due to the interference between the BTSs and among the users. Smart antenna technique can be used in a coordinated way among a group of BTSs, such as Femtocells, to avoid or reduce interference or manage how interference happens to achieve performance enhancement such as higher system throughput or better QoS to individual applications.

Methods and apparatus for preventing fluctuations in ambient light from affecting the optical input mechanism of a liquid crystal display device. In one embodiment, an independent light source is adapted to generate electromagnetic signals through the cover glass of the display device. When the user's finger is proximate to a certain region of the touch panel, the electromagnetic signals reflect off of the user's finger and back through the cover glass. One or more photosensors monitoring the presence of these reflected signals service the various regions on the touch panel where input may be detected. Thus, when the reflected signals are detected at a certain region, the user's finger may be assumed to be present.

Embodiments of the current invention reduce interference from a mobile station (UE) uplink transmission to a received broadcast downlink transmission through a network-based scheduling of time-slotted downlink broadcast transmissions, so that they do not occur concurrently with uplink transmissions. The invention allows low cost, low power UEs to be designed and built by use of the following techniques: (i) downlink broadcast transmissions are time-slotted; (ii) UEs operate either in half-duplex mode for transmission and reception of unicast services, or in full duplex mode where additional bandpass or additional highpass filtering can be applied to the DL unicast carrier; (iii) when unicast services are active for a UE, the UE informs the network of the broadcast services that are being decoded; and (iv) the network schedules unicast transmissions, broadcast transmissions, or both unicast and broadcast transmissions such that the uplink unicast transmission to a UE is never time-coincident with the broadcast transmissions to that UE.

A femtocell network uses idle resource blocks of a data frame to reduce interference by spreading the resource blocks of the users over the available spectrum. Spreading may be achieved by repeating the transmission using a number of the resource block groups. As a result, (a) more robustness is obtained against interference; (b) transmission power levels may be decreased because of the spreading, resulting in reducing interference between nearby femtocells and between a macrocell and a femtocell. Other methods of spreading such a frequency or time slot hopping may also be used.

An iterative method (400) and apparatus (200) for a receiver for reducing interference in a desired signal in a GSM communication system uses a finite-impulse-response filter combined with alternate quadrature component output selection for alternate linear equalization are disclosed The method includes inputting a burst of data of a received waveform including interference, training an alternate linear output filter with a midamble of known quadrature phase, providing an estimate of the desired signal by operating on the received waveform with the finite-impulse-response filter, generating log likelihood ratio estimates for a plurality of bits in the burst of data, selecting bits from the burst of data base upon a predetermined condition, and re-training the alternate linear output filter to provide a second improved estimate of the desired signal.

An equalizer bank with interference reduction is disclosed. The equalizer bank with interference reduction comprises a front-shelving filter, a plurality of peak filters, a rear-shelving filter and a plurality of compensators. The center frequency and the quality factor of each compensator are designed intentionally to be identical to those of the corresponding peak filter. When a user selects a specific gain level, the corresponding parameters that determine the peak filter and the compensator are retrieved directly and a complex calculation is skipped. Therefore, an audio signal can be equalized more efficiently with lower hardware cost.

A networked computing system capable of mitigating interference amongst neighboring base stations. The networked computing system includes multiple base stations, user equipment, a network resource controller, and a data communications network facilitating data communications amongst all network devices. A serving base station is configured to acquire interference metrics from its local user equipment and then generate an aggregate representation from the acquired interference metrics. The network resource controller is configured to acquire the aggregate representation, determine an interference reduction associated with a neighbor base station for each of the user equipment serviced by the serving base station, determine a power schedule for the first base station based on the aggregate representation and the determined interference reduction, and then modify a power schedule for the neighbor base station based on the determined interference reduction.

An electronic apparatus for reducing interference in a desired signal, the apparatus comprising: (a) a plurality of measurement signal lines, each connected to a respective measurement signal electrode; and (b) one or more reference signal lines, each connected to respective one or more reference electrodes; each of said measurement signal lines or a respective group of said measurement signal lines being associated by being in close physical proximity with a respective one of said reference signal lines for a substantial part of their lengths, so that each measurement signal line or signal line group with its corresponding reference signal line forms a measurement signal line or measurement signal line group / reference signal line pair, said electronic apparatus further comprising subtraction means for subtracting an interference on each reference signal line from an interference signal on the associated measurement signal line or from each measurement signal line in the measurement signal line group in that measurement signal line or measurement signal line group / reference signal line pair, wherein at least one of the measurement signal electrodes is arranged to be in direct electrical connection with a subject and at least one of the reference signal electrodes is arranged to be in close physical proximity but not in direct electrical contact with the subject.

Wireless transceiver apparatus for operating in a part of the RF spectrum which is shared with a co-located second wireless transceiver apparatus. The first wireless transceiver apparatus includes, a wireless transceiver unit; an arbitration interface for interfacing with an arbitration entity which arbitrates access to the shared part of the RF spectrum between the first wireless transceiver apparatus and the second wireless transceiver apparatus; wherein the arbitration interface is adapted to signal time periods when the wireless transceiver unit is operational, or requests to be operational; and wherein the arbitration interface is adapted to signal data about and commands to the first wireless transceiver apparatus during other time periods. An enhanced arbitration entity is adapted to automatically detect and switch between two modes or interference reduction, e.g. a first interference reduction means such as AFH, a second interference reduction means such as PTA. The arbitration entity gets the information of the first wireless transceiver via the arbitration interface.

A method for transmission mode change in a telecommunication network, said network having a public network comprising at least one public base station (NB) covering a public cell and a private network comprising at least one private base station (PBS) covering a private cell, wherein said at least one private base station has limited access rights for User Equipment (UEs) in the private network, and where said UEs are able to also communicate with the public network, comprising the step of: performing a private base station transmission mode change when the private base station is in an interference reduction transmission mode to an active transmission mode when a UE with access right to said private base station is detected in proximity of said private base station, where a detection of said proximity is based on information being specific for said UE and its relation to said private base station. The disclosure also relates to a telecommunication system.

Systems and method of detection and discrimination of targets in the presence of interference are disclosed. A system transmits a signal and then receives signals including interference and reflections of transmitted signals. The system processes the received signals and transmitted signals to generate a 2D representation of the STAP cube with one of the dimensions collapsed. The system then reduces the interference contributions and identifies angle and Doppler component of potential targets. The system then computes slices, which are one dimensional representation of cross-ambiguity functions of the received and transmitted signals. It reduces the interference contributions in the slices and determines range components of the targets.

An interference reduction device includes an analog to digital converter, a serial to parallel converter, a first FIR filter, a second FIR filters, a flip-flop, a decision unit, and a selector. The analog to digital converter performs A / D conversion. The serial to parallel converter performs a session of distribution processing in which a digital signal obtained by the A / D conversion. The first FIR outputs the signal after a filer operation at the desired output frequency. The second FIR filters each perform a filter operation, also each output the generated signals at the desired output frequency. The flip-flop samples the inputted digital signal. The decision unit decides which one of the FIR filters has the smallest influence of interference of the input digital signal. The selector outputs one of the signals outputted by the FIR filters.

In an environment in which a macro base station and a low transmission power base station exist, the ratio of the interference reduction time period of the macro base station is optimized, and the throughput of the low transmission power base station is improved, while minimizing a reduction in throughput. The macro base station causes a high interference to other base stations and one or a plurality of low power nodes (LPN) subjected to interference from the macro base station. The macro base station sets first and second data transmission time periods and then determines the ratio of the second time period and the pattern of the first time period and the second time period based on communication quality in the first time period and communication quality in the second time period of the macro base station and the LPN.

In order to make it possible to efficiently generate a replica signal for a data signal addressed to another reception station and perform interference cancellation processing or interference reduction processing using the replica signal, a replica generation unit (232) returns an interference data signal inputted from a decoding unit (209) to a symbol string generated by a transmission station and not yet subjected to frequency demapping processing. The generated replica symbol string is outputted to an interference cancellation unit (231). The interference cancellation unit (231) subtracts a replica frequency domain signal inputted from the replica generation unit (232) from a frequency domain signal inputted from an FFT unit (204) to remove an undesired reception station signal. A symbol string obtained as the result of the subtraction is outputted to a signal separation unit (206). Two or more kinds of replica signal generation processing are provided, a selection from the two or more kinds of replica signal generation processing is performed according to the state of a propagation path and the contents of data signal reception processing, a replica signal is generated by the selected replica signal generation processing, and interference cancellation is performed.

As control points in haptic systems move around, the phase offsets for each transducer change at discrete points in time. These are each expressed as a phase offset combined with a monochromatic carrier frequency. To prevent sharp frequency changes, an algorithm that maintains smooth transitions is used. Further, non-idealities in the implementation of haptic array modulation can create spurs in the frequency response of audio output from the array. Adjusting the signal carrier frequency and the signal modulating frequency may substantially reduce audio noise via a notch filter centered at an interpolation frequency.

A method and system for multi-cell interference reduction in a wireless communication system is disclosed. The present disclosure describes a new method and system for accurately detecting the characteristics of the interfering signals from relevant sources such as neighboring co-channel cells and other persistent interference sources. In order to better estimate the interfering signals, a base station designates a small inactive window in the transmit frame for a cell during which the communications between the base station and its terminals are reduced while every other communication pursues. As such, the interfering signals can be well exposed and the characteristics can be accurately detected. Based on the detected characteristics of the interfering signals, the base station can specifically design beam forming mechanism or other means to cancel or minimize the impact of such interference during regular communications.

A radio communication system including mobile terminals and plural base stations each of which communicates with mobile terminals existing in a subordinate cell. Each of the base stations includes an interference power measurement portion which measures a total interference power received from mobile terminals existing in adjacent cells; an interference reduction request portion which issues a request to reduce interference to base stations of the adjacent cells based on the total interference power; and a control portion which notifies mobile terminals existing in a subordinate cell of transmission power control information when the request to reduce interference is received from a base station of an adjacent cell, so as to reduce the interference. Each of the mobile terminals includes a reception portion which receives the transmission power control information from the base station that is requested to reduce the interference from the base station of the adjacent cell.

A satellite radiotelephone frequency band can be reused terrestrially by an ancillary terrestrial network even within the same satellite cell, using interference reduction / cancellation techniques. An interference reducer is responsive to a space-based component and to an ancillary terrestrial network. The interference reducer is configured to reduce interference in wireless communications that are received by the space-based component from first radiotelephones in the satellite footprint over a satellite radiotelephone frequency band using wireless communications that are received by the ancillary terrestrial network from selected ones of second radiotelephones in the satellite footprint over the satellite radiotelephone frequency band and / or wireless communications that are transmitted by the ancillary terrestrial network to the second radiotelephones in the satellite footprint over the satellite radiotelephone frequency band. The interference reducer may include a prefilter that is configured to determine the selected ones of the second radiotelephones.

A thin film resonator having enhanced performance and a manufacturing method thereof are disclosed. The thin film resonator includes a supporting means, a first electrode, a dielectric layer and a second electrode. The supporting means has several posts and a supporting layer formed on the posts. The first electrode, the dielectric layer and the second electrode are successively formed on the supporting layer. The thin film resonator is exceptionally small and can be highly integrated, and the thickness of the dielectric layer of the resonator can be adjusted to achieve the integration of multiple bands including radio, intermediate and low frequencies. Also, the thin film resonator can minimize interference and has ideal dimensions because of its compact substrate, making the thin film resonator exceptionally small, yet comprising a three-dimensional, floating construction.

An inter-node interference reduction method, node and system, wherein the method includes: a first node obtaining link state information fed back by a terminal within the coverage range of the first node; the first node calculating joint information reflecting the interference of a second node with the terminal based on the link state information, and sending the joint information to the second node; the second node scheduling a terminal within its own coverage range based on the joint information, wherein the joint information includes a codebook limit cluster and further includes one or more of a power level limit cluster, a priority indication information cluster and an interference level indication information cluster, and a correspondence exists between constituent elements of any piece(s) of information within the joint information and constituent elements of other information except the any piece(s) of information within the joint information

A system that incorporates aspects of the subject disclosure may perform operations including, for example, receiving, via an antenna, a signal generated by a communication device, detecting an interference in the signal, the interference generated by one or more transmitters unassociated with the communication device, and the interference determined from signal characteristics associated with a signaling protocol used by the one or more transmitters, and performing signal conditioning on the signal to reduce the interference. Other embodiments are disclosed.

A method for transmission mode change in a telecommunication network, said network having a public network comprising at least one public base station (NB) covering a public cell and a private network comprising at least one private base station (PBS) covering a private cell, wherein said at least one private base station has limited access rights for User Equipment (UEs) in the private network, and where said UEs are able to also communicate with the public network, comprising the step of: performing a private base station transmission mode change when the private base station is in an interference reduction transmission mode to an active transmission mode when a UE with access right to said private base station is detected in proximity of said private base station, where a detection of said proximity is based on information being specific for said UE and its relation to said private base station. The disclosure also relates to a telecommunication system.

A wireless communications system has a plurality of uplink and downlink channels available for use. Channels are distributed among different operators who may plan their networks in a non-ideal manner. A terminal uses an uplink channel and a downlink channel selected from those available and performs a method to check whether it is causing interference to other users of the system. The method determines whether the terminal is transmitting at a power which may cause interference to an adjacent uplink channel. If so, the terminal determines which downlink channel is associated with the adjacent uplink channel and monitors that downlink channel. The terminal may then operate in a manner which will reduce interference.

A CRS base station (21) includes a transmitting section configured to transmit a synchronization establishment signal, a receiving section configured to receive a random access signal corresponding to the synchronization establishment signal, a determining section configured to determine whether or not the random access signal received by the receiving section has been transmitted from an MCS terminal (12) and an interference reduction processing section configured to perform interference reduction processing on the MCS terminal (12) when the determining section determines that the random access signal has been transmitted from the MCS terminal (12).

The present invention relates to methods and arrangements for interference reduction for bursty or intermitted transmissions. DPCCH gating with regular on / off-gating patterns can create waveforms that can interfere with non-UMTS audio equipments, e.g. hearing aids. The present invention relates to modifying the transmission instants of data packets in such a way such interference can be significantly reduced. This is achieved by introducing a randomization mechanism into the mapping function of data packets onto the HARQ processes, which in turn are mapped onto predefined transmission occasions (sub-frames). This results in a non-periodic transmission pattern while maintaining user data transmission requirements.