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1024results about How to "Reduce the impact of interference" patented technology

Methods for the optical transmission of polarization multiplex signals

In order to reduce mutual interferences between POLMUX and signals, the signals are transmitted with differed to each other carrying signals, thereby making it possible to obtain the circular polarization of each resulting POLMUX signal. Each second POLMUX signal is transmissible with an opposite circular polarization. In order to reduce also interferences when only one modulated data signal is transmitted through a POLMUX channel, a polarization plane of modulated data signals of each second POLMUX channel is turned at 45°. In a variant, polarization multiplex signals are produces and the resulting polarizations thereof in adjacent channels are perpendicular to each other.
Owner:XIEON NETWORKS SARL

Wireless communication system and wireless communication method

Communication quality is prevented from being deteriorated due to interference caused by low accuracy of channel information or interference from another base station or another wireless communication system. A wireless communication system includes a first wireless station including a plurality of antenna elements, transmission units corresponding to the plurality of antenna elements, and a transmission directivity control unit that controls transmission directivity of the plurality of antenna elements, and a plurality of second wireless stations each including a reception power measurement unit that measures a reception power. The transmission directivity control unit determines the transmission directivity of each of the plurality of antenna elements so that a signal does not reach a particular second wireless station among the plurality of second wireless stations. The transmission units generate wireless signals using the transmission directivity. The plurality of antenna elements transmit the generated wireless signals. The reception power measurement unit measures the reception power in a period that is set so that a signal does not reach the particular second wireless station, and detect the presence or absence of interference.
Owner:NIPPON TELEGRAPH & TELEPHONE CORP

Interoperability improvement in terminals having a transmitter interfering with a receiver

A method is disclosed that is performed in an apparatus having a receiver including a number of modules. The method includes receiving information in a reception frequency band. Responsive to a notification from a transmitter of a transmission in a predetermined transmission frequency band, at least one countermeasure is performed by at least one of modules. The at least one countermeasure is predetermined to reduce an effect of interference caused by transmission on reception of the information in the reception frequency band. Exemplary countermeasures include freezing an automatic gain control loop, freezing a synchronization loop, discarding channel estimation data, and blanking received information. Certain criteria, such as transmission power and transmission mode may also be used to determine whether and how many countermeasures are to be used. Additionally, handover is improved by waiting until transmission is complete to determine receiver signal strength of signals from potential transmitters for handover.
Owner:NOKIA TECHNOLOGLES OY

Method and system for notifying layer mapping information under multi-user multiple input multiple output mode

The invention discloses a method and a system for notifying layer mapping information under a multi-user multiple input multiple output (MU-MIMO) mode. The method comprises that: a transmitting party allocates orthogonal DMRS for a group of receiving parties which are paired to perform MU-MIMO transmission under an MU-MIMO transmission mode, wherein the port number of the used DMRS on resources which are allocated to the group of receiving parties is the sum of layers respectively used by each receiving party; or, the transmitting party shares the DMRS for the group of receiving parties which are paired to perform MU-MIMO transmission, and determines the port number of the DMRS according to the layer number of the receiving party with the most using layers; and for each receiving party in the group of receiving parties, the transmitting party notifies the mapping mode information from the code word stream to the layer of the receiving party to the receiving party. The method and the system for notifying layer mapping information under the MU-MIMO mode can solve the problem of data solution mapping problem because of UE does not know the presence of pilot frequency of other layers, and improve the user data detection performance.
Owner:NANTONG HUAXIN CENT AIR CONDITIONER

Arrangement and method for reducing the impact of interfering signals in a communication system

An arrangement and method in a communication system such as an Orthogonal Frequency Division Multiplexing (OFDM) radio receiver for reducing the impact of interference from an intermittent interfering signal transmitted by an interfering system which may be co-located with the OFDM system or may be remotely located. Each OFDM symbol in a received OFDM signal includes a guard interval (GI), a middle portion, and a last portion identical to the GI. The arrangement determines which portion of each OFDM symbol is contemporaneous with the interfering signal and time-shifts a fast Fourier transform (FFT) window in the OFDM receiver to minimize or eliminate FFT processing of samples of the OFDM symbol that are contemporaneous with the interfering signal, thereby minimizing the impact of the interfering signal.
Owner:TELEFON AB LM ERICSSON (PUBL) +1

Cable detection apparatus and method

A cable detection apparatus is disclosed having a filter, the filter transmitting components of a signal detected substantially at certain harmonics of a first frequency. The filter may also attenuate the signal at certain even harmonics thereof. A method of detecting and / or locating cables in the same manner is also disclosed.
Owner:RADIODETECTION

Methods and devices for selecting sets of available sub-channels

Information is transmitted over selected, Orthogonal Frequency Division Multiplexed (OFDM) sub-channels to avoid frequencies with unacceptable congestion, noise or interference levels. Using frequency hopping, selected non-contiguous OFDM sub-channels used for transmission may vary with time. Once a group of OFDM sub-channels is selected, a power level and modulation technique may also be selected based on channel quality.
Owner:BEIJING XIAOMI MOBILE SOFTWARE CO LTD
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