227 results about "Random delay" patented technology

Exploiting the substantive reciprocity of internode channel responses through dynamic, adaptive modification of receive and transmit weights, enables locally enabled global optimization of a multipoint, wireless electromagnetic communications network of communication nodes. Each diversity-channel-capable node uses computationally efficient exploitation of pilot tone data and diversity-adaptive signal processing of the weightings and the signal to further convey optimization and channel information which promote local and thereby network-global efficiency. The preferred embodiment performs complex digital signal manipulation that includes a linear combining and linear distribution of the transmit and receive weights, the generation of piloting signals containing origination and destination node information, as well as interference-avoiding pseudorandom delay timing, and both symbol and multitione encoding, to gain the benefit of substantive orthogonality at the physical level without requiring actual substantive orthogonality at the physical level.

Exploiting the substantive reciprocity of internode channel responses through dynamic, adaptive modification of receive and transmit weights, enables locally enabled global optimization of a multipoint, wireless electromagnetic communications network of communication nodes. Each diversity-channel-capable node uses computationally efficient exploitation of pilot tone data and diversity-adaptive signal processing of the weightings and the signal to further convey optimization and channel information which promote local and thereby network-global efficiency. The preferred embodiment performs complex digital signal manipulation that includes a linear combining and linear distribution of the transmit and receive weights, the generation of piloting signals containing origination and destination node information, as well as interference-avoiding pseudorandom delay timing, and both symbol and multitone encoding, to gain the benefit of substantive orthogonality at the physical level without requiring actual substantive orthogonality at the physical level.

A method and apparatus for randomizing access probes from co-located mobile terminals in order to reduce collisions is provided. By each mobile terminal or group of mobile terminals computing a random delay between a minimum delay value and a maximum delay value and using the random delay to delay the starting time of access probes, collisions between access probes from different mobile terminals may be reduced.

An audience response system comprising a base unit and a plurality of remote units communicating using wireless communication operating on a frequency pair. When a response key on a remote unit is activated, the remote unit transmits a voting signal packet to the base unit. The base unit registers the vote and transmits an acknowledgment signal to the remote unit. When the remote unit receives an acknowledgment signal, the remote unit certifies to the operator that the vote was received. If an acknowledgment signal is not received, the remote unit will attempt at least one retransmission after a random delay before alerting the operator that the vote attempt has failed.

The invention provides apparatus methods for avoiding channel collisions in Wireless Regional Area Networks (WRAN), A medium access controller (MAC) for switching a base station (BS) of a WRAN from a first channel to a second channel at a time t is provided. The MAC includes a switch time delay circuit for delaying said switching with respect to time t by a random delay time.

A method of searching reverse traffic channels in a code division multiple access (CDMA) mobile radio communication system for allowing for acquisition of reverse traffic channels without increase or decrease of size of a search window for traffic channels, the method comprising the steps of: storing an offset by a propagation delay after acquiring a reverse access channel; determining whether or not a pseudonoise (PN) random delay is employed for the reverse access channel and, when the PN random delay is used, calculating the PN random delay using a hash function with a factor of an electronic serial number (ESN) transmitted from a mobile station; computing the stored offset and the PN random delay and setting a new offset to a result of the computing; setting a center of a search window for searching the reverse traffic channel to the new offset and establishing the search window; and searching a reverse traffic channel preamble with the established search window.

The invention discloses a microminiature unmanned aerial vehicle longitudinal control method with random delay of a distributed network, and belongs to the field of flying control technology. The method includes firstly setting up an unmanned aerial vehicle longitudinal system model and designing a flying control system without network delay, secondly carrying out random robustness analysis and design on the flying control system on the condition of different network random delay, ensuring a gain scheduling strategy of the flying control system, and lastly carrying out closed-loop six-free-degree freedom nonlinear Monte-Carlo simulation verification. According to the control method, deterioration of quality of the flying control system due to network delay is relieved, and stability of the distributed type system can be strengthened. Through utilization of the random robust analysis and design method and the gain scheduling strategy based on linear interpolation, the obtained control has the advantages of being simple, and facilitating engineering realization. Control quality of an original system can be well maintained on the condition of changes of large network delay.

A technique for avoiding spurious TCP timeouts through delay injection which requires no modification of, or access to, the TCP protocol itself. More particularly, injection of additional random delay or jitter at some point in a packet's roundtrip path across a wireless communications network is employed so as to increase the variance in round trip times, without significantly increasing the average value thereof. Spurious TCP timeouts are avoided through the artificial delay injection which occurs at a network element along the communications path and without modification of, or requiring access to, the TCP protocol. Further, the injection of artificial delay is applied on a transaction-by-transaction basis. That is, the decision to inject, or not inject, the artificial delay as well as the value of the injected delay are applied to each TCP connection or TCP flow.

A design tool inserts randomized delays into synchronizers for signals crossing from one clock domain to another. Rather than having a wide range of random delays to select from, each synchronizer's randomized delay is selected from only two possibilities. An added delay of either zero or one clock period of the new domain's clock is added as the randomized delay. The randomized delay causes the re-synchronized domain-crossing signal to become available either in the expected cycle or in the cycle following the expected cycle. Logic hazards caused by the domain-crossing signal can be detected and the possible results simulated. The synchronizer can be a series of two flip-flops, with the random delay added to the first flip-flop. Randomized delays of either one or none added periods of the clock can also be added to multi-cycle signals within one clock domain that have two or more clock cycles to propagate.

The invention discloses a multi-channel synchronous high-speed data collection device. A synchronous clock is provided through a clock management module, an ADC (Analog to Digital Converter) is driven by a sampling clock to sample a signal to obtain sampling data and then transmit the sampling data to an collection FPGA (Field Programmable Gate Array), a multi-ADC data synchronization module adds a timestamp mark for the sampling data in the ADC, the sampling data is subjected to sequence adjustment in the collection FPGA, a sampling point with a flag bit is adjusted to be a first path, and multi-ADC data stream synchronization is realized by increasing dynamic time delay; the clock synchronization timestamp adding and link establishment sequence management module manages the working sequence of three independent processes of clock synchronization, a timestamp function and a JESD204B link, and solves the conflict of the three independent processes in multi-ADC data synchronization, and the multi-channel sampling synchronization module adjusts the phase relation between a timestamp signal and a sending end device clock. The random delay caused by taking the time sequence of the two as an example is avoided, the accurate delay adjustment is performed on the signal based on the triggered data storage synchronization module, and the data synchronous storage between different boards is realized.

The invention relates to a system and method for broadcasting VoIP messages. In one respect, embodiments of the invention utilize random delays to disguise the automated nature of the messaging source. In another respect, embodiments of the invention are configured to persist when error messages are encountered.

Apparatus and method for reducing collisions on an enhanced access channel in a high bandwidth wireless network during a push-to-talk (PTT) communication between a plurality of user devices. A random delay field is introduced to a set of access parameters and the random delay is generated at each user device when the user devices are ready to transmit an access probe through the enhanced access channel to a base station. At the end of the random delay, the user devices send the access probe through the enhanced access channel to the base station. A maximum random delay field may be set by the base station.

The invention discloses a microminiature unmanned aerial vehicle controlling method having a network random delay problem. The microminiature unmanned aerial vehicle controlling method belongs to the technical field of flight control, and comprises the following steps of: establishing an unmanned aerial vehicle system model and designing a control law; analyzing random robustness of a system having the network random delay problem; determining a network updating cycle, an optimization index and index weight; designing a robustness control law by a random robustness designing method; and implementing closed loop six-freedom degree nonlinearity Monte Carlo simulation verification, wherein in the step 2, the network random delay problem includes sensor observation delay, executor control delay and hybrid delay with superposition of observation and control. According to the controlling method, shortcomings of high requirement on communication quality and poor robustness of a conventional linear secondary regulator are overcome; a controlling method based on robustness analysis and design is introduced to control the unmanned aerial vehicle based on a network, thereby reducing a requirement on updating rate of a formation wireless data chain of the unmanned aerial vehicle, and enhancing robustness of formation of the unmanned aerial vehicle.

The invention discloses a method, system and terminal for randomly accessing a terminal. When a network load is overhigh or congestion exists, a network sends delay access information to one or more terminals, and after receiving the delay access information, the terminal accesses the network after random delay access time. According to the invention, computed actual random delay access time is uniformly distributed in a certain time slot, a large quantity of terminals requesting to be attached on the network at the same time and being rejected by the network can not be attached on the same time point during secondarily requesting to attach, and the purpose of controlling the random control is achieved. The computing operation is not carried out in a core network, thus network load is lightened.

The invention concerns a method (300) and mobile unit (110) for reducing transmission collisions. The method can include—in a systemless call environment—receiving (314) at a plurality of receiving mobile units (110B, 110C) a call from an original transmitting mobile unit (110A) and in the plurality of receiving mobile units, selectively randomly delaying (316) transmissions from the receiving units to reduce the probability that such transmissions will collide with one another. The selectively randomly delaying a transmission at the receiving units step can include performing (318) a pre-transmission scan when a transmission element (112) of one of the receiving mobile units is activated or by assigning (330) a random delay to an idle mode (400) following a receive session in the receiving mobile units.

The invention discloses a time synchronization protocol system based on a chain industrial Ethernet and a synchronization method, and belongs to the technical field of communication. Measuring errors are decreased by the aid of a fixed-delay instant forwarding mechanism controller and a PLL (phase locking loop) frequency multiplication module output high-frequency clock, clock drift compensation is realized by the aid of a digital PLL clock drift compensation module, clock offset compensation is realized by the aid of a PI (proportional-integral) control ring clock offset compensation module, modules are obtained by the aid of a physical layer clock timestamp, and the influence of random physical link delay on clock timestamp acquiring accuracy is decreased. Random variables affecting chain Ethernet clock synchronization accuracy are limited or cut down, and the clock synchronization accuracy is improved.

The invention discloses a mobile terminal random access method of a TD-SCDMA system. The method comprises the steps of: adding a power climbing counter in a random access process; counting path loss again based on the values of the power climbing counter and a signature retransmission counter; adjusting a signature sequence emitting power; emitting the signature sequence to attempt to randomly access again based on the adjusted signature sequence emitting power, and therefore the success rate of randomly accessing the mobile terminal of the TD-SCDMA can be raised, and the user experience can be improved. In the method, a function control terminal of the timer is utilized to count the path loss and adjust the signature sequence emitting power so as to wait for a random delay to reduce continuous collision of the mobile terminal in accessing.

A system for providing signal trigger pulses comprises an equivalent time sampling unit providing transmit and receive trigger pairs, and a control unit controlling the equivalent time sampling unit to provide pseudorandom delay length variations between the trigger pairs.

A method and device for processing binaural audio signals. The method comprises: subtracting original audio signals of a left sound channel and a right sound channel and then performing middle-frequency band-pass filtering thereon to obtain a middle-frequency background sound signal; superposing the original audio signals of the left sound channel and the right sound channel and then performing low-frequency band-pass filtering thereon to obtain a low-frequency background sound signal; respectively performing random delay processing on the middle-frequency background sound signal and the low-frequency background sound signal and superposing same, and outputting a first left sound signal in a forward direction and outputting a first right sound signal in a reverse direction; respectively convoluting the first left sound signal and the first right sound signal with a head-related transfer function to perform virtual locating processing so as to respectively obtain corresponding left and right surround 3D environmental background sounds; and superposing the left surround 3D environmental background sound and the original audio signal of the left sound channel, and the right surround 3D environmental background sound and the original audio signal of the right sound channel to form left and right output sound signals having good surround stereoscopic sensations. By means of the above-mentioned method and device, left and right output sound signals having good surround stereoscopic sensations can be obtained.

A distributed system in which time-dependent credentials are supplied by controllers that operate according to different local times. Errors that might arise from the controllers generating inconsistent credentials because of time skew are avoided by identifying credentials generated during transition intervals in which different ones of the controllers may generate different credentials at the same absolute time. During a transition interval, controllers and other devices may use credentials differentially based on the nature of the authentication function. Each controller may periodically renew its credentials based on self-scheduled renewals or based on requests from other devices, such that renewal times are offset by random delays to avoid excessive network traffic. Controllers may determine which credential is valid for any given time, based on a cryptographically secure key associated with that time and information identifying the entity that is associated with that credential.

The invention relates to an interference method based on adaptive random-relayed TCP / IP network hidden-time signal path, which belongs to the technical field of network safety. Network data packets are stored in an interference gateway buffering area and data packets in the queue are sequentially transmitted; every data packet on the first position of the queue is randomly delayed, the maximum value of the random delay is influenced by the length of the queue, when the queue is long and the network is crowded, the maximum value of the random delay is reduced, and the transmitting speed of the random delay is accelerated, thus, the method has adaptability on the network flow. The invention effectively interferes the network hidden-time signal path, reduces the capacity of the signal channel, and guarantees a certain network service quality so as to be used for the interference of the hidden-time signal path of the actual network system.

The invention discloses a method and a system for a master device to automatically number slave devices, belonging to the technical field of an optical fiber distribution system. The method comprises the following steps that: S1: the master device broadcasts an order of collecting SN sequence numbers of the slave devices; S2: the slave devices return back own SN sequence number information after random delay time; S3: after collecting the SN sequence number information of all the slave devices, the master device forms a SN sequence number and serial number corresponding list, and sends the list to all the slave devices; S4: after receiving the list, the slave devices respectively contrast own SN sequence numbers according to the SN sequence number and serial number corresponding list, find out corresponding serial numbers and generate own unique serial numbers. By automatically and uniquely numbering the slave devices, a problem of collision caused by reporting communication data by multiple slave devices can be avoided, moreover, the SN sequence number, the specific geographical position and the device serial number information of each slave device are maintained at the master device side, thus, state of multiple slave devices can be monitored accurately, project opening efficiency is improved, and later maintenance of the devices is facilitated.

The invention relates to a rapid response and long-distance identification radio-frequency tag which comprises a radio-frequency chip, a main control MCU, etc.; the invention is provided with a global unique ID number, variable information which has 4K byte maximal capacity and can be rewritten by users; a special factory power-saving mode, thereby reducing meaningless energy consumption. At the same time, the invention provides a communication mechanism with rapid response between a reader-writer and a tag, which comprises the following: the first step: the reader-writer emits an enabled broadcast frame; the second step: the tag receives the enabled broadcast frame; the third step: the tag carries out random delay; the fourth step: the tag carries out signal channel detection; the fifth step: the tag sends data information; the sixth step: the reader-writer receives the data information of the tag; the seventh step: the tag verifies whether the reader-writer receives the data information or not; the eighth step: the tag enters into a long dormant state. The invention can meets the requirements of remote identification and rapid response in practical application and can solve the practical application in management of outdoor billboards, container freight stations, etc.

The invention discloses a method for connecting clients with a server, which comprises the following steps: acquiring random number seed information by the clients; after the clients are disconnected from the server, working out random delay time by the clients according to the random number seed information and random functions, wherein the random delay time is delay time for reconnecting the clients with the server; and after the random delay time passes, sending connecting requests to the server by the clients. Therefore, under the condition that the server is restarted or delayed, in the method for connecting the clients with the server, delay connection is respectively performed by all the clients according to the random delay time respectively calculated by the clients, thereby, the condition that a large number of clients simultaneously ask for connecting with the server is prevented from happening, and the server is avoided interrupting servicing.

A distributed system in which time-dependent credentials are supplied by controllers that operate according to different local times. Errors that might arise from the controllers generating inconsistent credentials because of time skew are avoided by identifying credentials generated during transition intervals in which different ones of the controllers may generate different credentials at the same absolute time. During a transition interval, controllers and other devices may use credentials differentially based on the nature of the authentication function. Each controller may periodically renew its credentials based on self-scheduled renewals or based on requests from other devices, such that renewal times are offset by random delays to avoid excessive network traffic. Controllers may determine which credential is valid for any given time, based on a cryptographically secure key associated with that time and information identifying the entity that is associated with that credential.

A method for measuring a distance to a target in a multi-user environment by means of at least one sensor, comprising: irradiating the environment by means of a series of radiation pulses, wherein series of radiation pulses are emitted at a determined repetition rate and with a determined random delay; collecting pulses that are reflected or scattered from the environment to at least a detector connected to at least one chronometer; assigning a timestamp at every detected pulse on the detector; subtracting the added delay from every registered timestamp coming from the chronometer, the result corresponding to the time of arrival; determining the statistical distribution of said time of arrival; determining the distance to the target from said statistical distribution.