194 results about "Wireless interference" patented technology

Device, system and method, in a vehicle communication system, to transmit wirelessly a message comprising the position, heading and speed of a vehicle or other moving object, wherein the transmission is repeated at regular intervals in a temporarily fixed time slot within a predetermined basic time interval. In a key embodiment the message duration is equal to or less than a predetermined time slot duration. Embodiments use generally the same time slot in a contiguous sequence of basic time intervals. Algorithms are described to resolve wireless interference within a time slot. Embodiments divide the basic time interval in multiple durations, “class regions,” for different message classes. Embodiments use different wireless bandwidth allocation algorithms for the class regions.

Disclosed is a general model and method for computing performance bounds in multi-hop wireless networks. Rather than focusing on computing asymptotic performance bounds under assumptions of homogeneity or randomness in the network topology and/or workload, the present invention accommodates any given network, technology, interference model, routing paradigm, and workload. Using a conflict graph to formally characterize the impact of wireless interference on the performance of multi-hop wireless networks, methods for computing upper and lower bounds on the capacity of a given wireless network are detailed. Besides computing network capacity, the model and method disclosed can also enable or benefit other applications including maximizing fairness and minimizing maximum link utilization.

Mitigating interference in a mobile wireless communication device by using an estimation of the performance impact of interfering signals generated by a wireless cellular transmitter and received by a co-located wireless local area network receiver. Wireless local area network frequency band usage is modified based on the performance impact estimation and the state of the wireless cellular and wireless local area network connections. The estimation accounts for properties of the wireless cellular transmitter and wireless local area network receiver as well as operational characteristics of the wireless cellular and wireless local area network connections.

The invention provides a wireless bandwidth selecting method based on WLAN wireless bandwidth assessment. The wireless bandwidth selecting method based on WLAN wireless bandwidth assessment includes the steps that wireless access points of wireless signals are scanned and output within a preset time period; the number of the wireless access points with the first working frequency band and the wireless access points with the second working frequency band is counted; the intensity of the wireless signals output from other wireless access points around the main wireless access point is detected; a first channel bandwidth or a second channel bandwidth is automatically selected according to the number of the wireless access points with the first working frequency band and the wireless access points with the second working frequency band, and the intensity of the wireless signals output from the wireless access points, with the first working frequency band and the second working frequency band, around the main wireless access point. The optimal bandwidth can be selected automatically according to changes of surrounding wireless network environment; when surrounding wireless interference is strong, the bandwidth is automatically converted to be 40 MHz, and high-rate transmission is guaranteed; when surrounding wireless interference is weak, the bandwidth is automatically converted to be 20 MHz, and the basic wireless communication quality is guaranteed.

The invention provides a channel allocation method in wireless mesh network, which uses the radio frequency protection ratio and district traffic intensity as the channel allocation indicator to realize the co-channel multiplexing in a virtual layered Mesh network structure. The channel allocation scheme performs the channel allocating using the district as unit and an extended set T-coloring coloring module is used. The radio frequency protection ratio is used as the indicator of the channel allocation and the channel is multiplexed when the carrier interference is larger than the radio frequency protection ratio. The district diameter is controlled in district separation way when the district traffic intensity is not uniform. The invention provides a wireless channel allocation method for the virtual layered Mesh network structure, therefore the utilization ratio of the wireless frequency spectrum resource is increased and the wireless interference between the districts is reduced.

The invention discloses an intrusion and tracking interference system and method of an unmanned aerial vehicle. The system comprises a wireless intrusion device unit, a tracking device unit and an interference device unit. The wireless intrusion device unit combines with radio interception technology to obtain movement and location information of the unmanned aerial vehicle, the tracking device unit controls directional antennas to point to the unmanned aerial vehicle in real time according to the location information of the unmanned aerial vehicle, the interference device unit generates interference signals and sends out the interference signals by the tracking device unit to achieve the interferences of unmanned aerial vehicle instructions, navigations and image transmission signals. The intrusion and tracking interference system and method of the unmanned aerial vehicle obtain the movement and location information of the unmanned aerial vehicle by adding the radio interception technology based on the unmanned aerial vehicle signal interference device, adopt the directional antennas to track the unmanned aerial vehicle through the tracking device and guide the interferences at the same time, the impacts on the surrounding electronic device by the signal interferences are reduced, the effectiveness and efficiency of the interferences are improved, defense tasks of the unmanned aerial vehicle are completed accurately and efficiently, the defense costs and incidental wireless interference impacts are reduced.

The invention provides a wireless resource allocation method capable of supporting the frequency spectrum resource sharing, which solves the wireless resource dynamic allocation problem in an isomerization network for supporting the frequency spectrum resource sharing. The useable wireless resource in a wireless resource control terminal dynamic allocation area is provided for different wireless communication system, therefore the frequency spectrum resource sharing is supported. The wireless resource control terminal dynamically partitions the handled wireless resource in multi-dimensionality a resource allocation mechanism suitable of multi work mode wireless communication system and a prediction mechanism of resource demand are used and the competition of different wireless communication systems on the wireless resources is controlled, therefore the maxi wireless resources utilization is obtained. The wireless resources utilization is increased and the wireless interference between the isomerization networks is prevented.

A radio frequency (RF) source detector detects and analyzes RF signals in order to determine the source of interference. The source detector is useful for installing and troubleshooting a wireless local area network (WLAN) or similar communication devices. The detector includes a receiver to receive RF signals from unknown RF sources, a processor for determining the level and characteristics of the RF signals and for determining the identities of unknown RF sources, and a display on which the processor displays the identities of the RF sources.

The invention relates to a self-adaptive networking method based on a baseband with a large-scale processing ability and business. Various access communication nodes access the baseband with the large-scale processing ability to realize intensive processing and controlling, and a three-level network of a cloud computing server, the baseband with the large-scale processing ability and the access communication nodes is formed. The baseband with the large-scale processing ability configures the access communication nodes according to the requirements of business and also self-adaptively adjusts resource and power distribution to increase the energy efficiency of the network according to the change of the business and a coverage area. User equipment covered by different access communication nodes shares the same wireless resource, the large-scale collaborative airspace interference control can also be realized, and wireless interference is reduced. As the method utilizes the baseband with the large-scale processing ability with a function for supporting heterogeneous multimode communication and a software-defined calculating ability to realize intensive controlling to network elements and sharing to the wireless resource, the wireless network realizes self-adaption to the coverage and the dynamic change of business, the energy consumption and interference of the network are reduced, and the spectral efficiency and the energy efficiency of the network are increased.

The invention relates to a communication method for solving problems due to a hidden terminal in a wireless network based on a wireless interference cancellation technique and a node full-duplex mode. Under a wireless local area network physical layer, wireless network nodes are coded into special interference signals by an OFDM (Orthogonal Frequency Division Multiplexing) technology, and overlapped into data signals in the air by means of ''attachment''. The control information and the data information can be transmitted in parallel, thus, the resource consumption on control information can be saved. The nodes for receiving the data information can remove the interference signals by an interference canceling technology in order to obtain the original data. The node for receiving the control information can demodulate the control signal from the mixed signal by an energy detecting technology, so as to obtain the physical address of the node which is transmitting in a collision domain, as well as establishing a relative node list. By inquiring the transmitting state and the receiving state of adjacent nodes, the node can determine whether it is the hidden terminal, so as to avoid transmission of conflict data and increase channel utilization rate.

Methods are described for optimizing wireless networks in a predictable way, i.e., the performance optimized is achievable in a real network. The methods consist of two main components: (i) a novel model that captures the relationship between network topology, wireless interference, traffic demand, and MAC-induced dependencies to accurately predict the throughput of individual flows in the wireless network, and (ii) a model-driven optimization that uses this model to optimize the network for a given performance objective.

The invention provides a transmission method of a household appliance local area network for solving the problem that when working at the same time, a plurality of existing household appliances cannot respond in time. The transmission method can solve the problem that under the situation of a module 433 selected at present, the household appliances cannot respond in time when working at the same time. The transmission method of the household appliance local area network comprises the steps that firstly, a gateway unit sends out a networking order, and the household appliances needing to have access to the network have access to the network in sequence; secondly, the gateway unit allocates corresponding network IDs to the household appliances having access to the network according to the network accessing sequence; thirdly, the gateway unit determines which transmission mode is needed to transmit data according to the order, wherein if the order is a broadcast order, the time quantum dividing method is adopted so that the different household appliances in the network can transmit the data in the corresponding quantum, and if the order is a single household appliance order, the method of monitoring a channel firstly and then carrying out transmission is adopted to transmit data; fourthly, if the gateway unit is subjected to strong wireless interference in one channel, the channel conversion method is adopted to avoid interference.

The invention discloses a self-adaptive monitor matching anti-interference method of a wireless sensor network. The self-adaptive monitor matching anti-interference method adopts a 'self-adaptive monitor matching window' flexibly adjustable in receiving window size to receive data information transmitted from a source node. A receiving monitor window is maximum in size in an initial state, and a received signal strength indicator measures the strength of wireless signals. When the signal strength is lower than a set threshold value, a cycle rate counter adds 1. When the signal strength is higher than the set threshold value, signal receiving starts. When signal receiving succeeds, a communication window is adjusted to be maximum in size and returns to the initial state. If the receiving fails, the window size is decreased. In the monitoring process, if no interference signal or normal signal is found in M cycles, the size of the receiving monitor window is minimum. When the monitor window is in a minimum state, interference signals always exist in the M cycles, and the window is adjusted to be in an intermediate state. By the adoption of the self-adaptive monitor matching anti-interference method, monitor errors between a transmitting node and a receiving node in a wireless interference environment is effectively decreased, and unnecessary energy consumption and lost data packets are reduced.

The invention provides a method of acquiring an unauthorized spectrum wireless environment, a device thereof and a terminal. The method comprises steps: a control message is received, wherein the control message comprises a command for measuring the unauthorized spectrum wireless environment by MDT (Minimization of Drive Test) and relevant configuration parameters; and according to the configuration parameters, MDT measurement on the unauthorized spectrum wireless environment is carried out. With the help of the existing MDT frame, technology extension on MDT relevant control link is carried out, an operator can know the statistical level condition of carrier resource load in the unauthorized spectrum through the existing MDT platform and the extended MDT means, a better decision can be made for deploying and using the unauthorized spectrum resources, wireless interference between different operator systems is lessened, the capacity of each mobile system is enhanced, and the data throughput rate of each user is enhanced.

The invention discloses a dimming method of an LED (Light Emitting Diode) streetlamp. A light control room sends a dimming signal to an AC/DC (Alternating Current/Direct Current) power supply which outputs direct voltage currents in different voltages according to the dimming signal to an LED constant current power supply module through a direct current bus. The LED constant current power supply module outputs different currents to the LED lamp using input voltage as the dimming signal, so that the LED streetlamp is dimmed. According to the invention, the dimming signal is transferred through a power bus, and brightness control signal detection can be realized by a simple comparison circuit without an independent control circuit. The system is simple in structure, and the system cost is lowered. Wireless interference and electromagnetic interference are avoided, the electromagnetic environment is purified, and the system reliability is improved.

The invention provides a communication interference detection system and method for a wireless product. Before a 2.4G wireless product is put into use, interference on the communication frequency band and communication space of the 2.4G wireless product is simulated by distributing a Wi-Fi signal interference source around the product and covering an entire 2.4G public frequency band so as to detect the same-frequency-band wireless interference situation of the 2.4G wireless product in the surrounding environment, so that the working state of the 2.4G wireless product under same-frequency-band wireless interference is reflected. Testing is performed in advance to take necessary measures in time before the product is put into use so as to avoid the wireless interference, so that future normal use of the product is ensured.

The invention relates to a method for minimizing system confidentiality interruption probability using energy station, comprising: 1) transmitting by an energy station wireless energy to a source node prior to a Theta T time wherein theta represents a time allocation factor ranging from zero (not included) and one (not included) and T represents a time slot; 2) estimating the channel state information of a communication system by the energy station through the listening of the pilot frequencies at the source node, a legal receiving node and an eavesdropping receiving node; through the utilization of the estimated and obtained channel state information, designing a corresponding best beam former w2 by the energy station; 4) in the coming (1-theta)T time, transmitting by the source node the wireless signals to the legal receiving node and eavesdropping by the eavesdropping receiving node the wireless signals; and using the beam former w2 by the energy station to transmit wireless interfering signals to the legal receiving node and the eavesdropping receiving node so as to minimize the system confidentiality interruption probability. According to the invention, an energy station is used to make the physical layers more secure, therefore, raising the confidentiality security performance of the entire communication system substantially.

The invention relates methods for adjusting radio-frequency circuitry to mitigate interference effects. An electronic device may transmit and receive wireless signals using wireless circuitry that is controlled by control circuitry. The wireless circuitry may include adjustable components such as adjustable antenna structures, adjustable front end circuitry, and adjustable transceiver circuitry. During characterization operations, the electronic device may be tested to identify operating settings for the wireless circuitry that lead to potential wireless interference between aggressor transmitters and victim receivers. The control circuitry can adjust the wireless circuitry to mitigate the effects of interference based on settings identified during characterization operations or real time signal quality measurements.