564 results about "Packet detection" patented technology

The invention relates generally to the field of wireless communications and more particularly to a method of and device for detecting the presence of a received data packet in a digital receiver. The present invention proposes a simplified method of correlation by removing dependency on the amplitude fluctuations while at the same time maintaining phase relevancy. The key advancement involves mapping the complex quadrature amplitude modulation (QAM) preamble to a quantized phase shift keying (PSK) constellation before application to a matched complex correlator. The proposed process essentially “amplitude normalizes” the input signal without the use or complexity associated with a divider. This simplified normalization scheme makes the packet detection algorithm robust against amplitude variations in the input signal, while still allowing for good correlation output. In applications where interference is superimposed on the I/Q input signals, the invention improves the detection capability over automatic gain control (AGC) normalization methods.

Provided are a network slave node and a time synchronization method using precision time protocol-like (PTP-like) in a network. The network slave node includes a packet detection unit for detecting whether the slave node receives or sends a synchronization protocol packet and recording a synchronization protocol packet receiving time and a synchronization protocol packet sending time; a hardware clock; and a control unit controlling the packet detection unit and the hardware clock. The control unit reads out the packet receiving time and the packet sending time from the packet detection unit and informs a local master node. The local master node calculates a time offset between the local master node and the slave node, and informs the control unit. The control unit adjusts the hardware clock based on the time offset so that the local master node and the slave node are time synchronized.

By embedding as a Physical Layer (PHY) Appliqué patterns (time, frequency, tone multiplexed, control signal, explicit network authentication, projective, other, or combined) on wireless electronic communications network (WECN) digital signal packets, and using a QRD-based auto-SCORE adaptation algorithm to maximize the signal-to-interference-and-noise ratio (SINR) attainable by multielement arrays over very small time-bandwidth products, differentiation and detection of signals from environmental noise (particularly from other or non-network signals) can be improved, allowing more compressed, secure, efficient network operations. By projecting the signal embedding onto a known linear subspace and using integrated transmit/receive structures, packet detection algorithms, and blind array adaptation algorithms, the WECN processes the data received with constant false-alarm rate, generalized, maximum-likelihood detectors and multilink signal estimation algorithms, based only on knowledge of the embedding pattern used at the transmit node. The resultant system provides PHY information-assured (PHY-IA) data transmission with improved network efficiency and security.

A packet detection apparatus detects a packet from a received signal by using a preamble containing an established, repeating training sequence. A first autocorrelation calculator computes a first autocorrelation of the received signal over a first interval. A first determining unit determines packet discovery by comparing the first autocorrelation to a first autocorrelation threshold value. A second autocorrelation calculator computes a second autocorrelation of the received signal over a second interval equivalent to the interval length for packet discovery announcement. A second determining unit determines packet discovery announcement by comparing the second autocorrelation to a second autocorrelation threshold value lower than the first autocorrelation threshold value.

The invention discloses a big data security analysis system based on massive network monitoring data. The system includes a data traffic monitoring module, a deep packet detection module, a data jointanalysis module, an anomaly detection module and a security evaluation module, wherein the data traffic monitoring module is used to monitor data traffic in real time, analyze applications, perform lossless collection on various system traffic data, and transmit the data to other modules; the deep packet detection module is used to judge the service types and application types by deeply reconstituting and analyzing the payload content of a seventh-layer packet and matching service characteristics, and performs analysis to obtain different application types; the data joint analysis module is used to perform data aggregation and study the state and association analysis to further remove redundant information in original data; the anomaly detection module is used to detect a data analysis result and judge whether the data is abnormal; and the security evaluation module is used to obtain a data evaluation result by combining the network situation based on the analysis and detection of other modules. According to the system, the real-time monitoring of network data and corresponding data security analysis can be implemented, and the data security and reliability can be improved.

The invention provides an intrusion detection system (IDS) and a method based on IPv6 network environment. The system comprises a protocol set and rule base module, a data packet capture module, an IPV6 protocol analysis module, a protocol analysis and state tracking module, a rule analysis and packet detection module and a warning and logging module. The invention well solves the new problem of transplant of the IDS, brought about by the new IPv6 standards and characteristics, and improves the capture ability of the data packet, the detection means of the IDS and the safety detection abilityof the IDS.

The invention relates to the field of communication, and discloses a method, a device and a system for detecting packet loss. The technical effect of detecting the situation of packet loss of each path under a multi-path scene by generating a detection message carrying multi-path identification and sequence number of the detection message through an inlet node, setting the multi-path identification as a first value, setting the sequence number of the detection message as the number of detection messages which are transmitted to the path of the detection message by the inlet node, and transmitting the detection message to the path transmitting the detection message.

Techniques for and apparatus capable of implementing packet detection and signal recognition in wireless communications systems are disclosed. In particular, the disclosed techniques and apparatus incorporate at least one of relative energy detection operable on assessment of a relative energy threshold for an inbound signal borne across an RF channel, carrier sense operable upon on assessment of at least one of a peak-to-sidelobe ratio and peak-to-peak distance defined by the inbound signal, and comparison operable upon demodulated data corresponding to the inbound signal as compared to predetermined preamble data. Clear channel assessment is performed based on determinations undertaken by one or more of the aforementioned relative energy detection, carrier sense and comparison operations.

The invention discloses an Internet protocol security (IPSec) flow rate security detection method, equipment and a system. The method comprises the following steps that: when an initiation party initiates an Internet key exchange (IKE) request of the IPsec communication to a response party through gateway equipment, and the gateway equipment intercepts and captures the IKE request, extracts the source address of the request and the corresponding target address of the response party and stores the source address of the request and the corresponding target address of the response party into a local data list; the encryption consultation is respectively carried out with the initiation party and the response party, and in addition, IPsec security channels with the initiation party and the response party are respectively built; the initiation party encrypts a data packet to be sent to the response party by a gateway equipment consultation encryption method and sends the data packet to the gateway equipment through the IPsec security channel built with the gateway equipment; after the gateway equipment receives the data packet, the deep packet detection is carried out after the data packet is decrypted by an encryption method negotiated with the initiation party; when the deep packet detection is passed, the gateway equipment encrypts the data packet by the encryption method negotiated with the response party, and the data packet is sent to the response party through the IPsec security channel built with the response party.

A wireless signal processor includes an analog front end for generating at least one baseband analog signal, at least one analog to digital converter for converting the baseband signal into a digital signal, the analog to digital converter having a resolution width and a sampling rate, and a baseband processor for measuring the signal energy in the analog to digital converter output, and when the incoming signal energy level increases or a baseband processor detects a packet, at least one of the sampling rate or resolution width also increases until the end of the packet, after which the sample rate and resolution are reduced to an interpacket rate and resolution. Additionally, the sampling rate and resolution increase after packet detection at rates and resolutions which are dependent on packet type and data rate.

A wireless receiver generates quadrature baseband signals which are sampled by a high speed analog to digital converter (IQ ADC) and also uses a receive signal strength indicator (RSSI) which is sampled by an RSSI analog to digital converter (RSSI ADC). The RSSI ADC signal is processed in combination with an end of packet signal to generate a first threshold from the average RSSI signal after the end of packet with the receive amplifiers set to a comparatively high level. A second threshold is generated by adding a threshold increment to the first threshold, and when the RSSI crosses the second threshold, the IQ ADC is taken out of a standby mode and placed in an active mode for the duration of the packet. The RSSI ADC is enabled from end of packet until packet detection by the baseband processor, and placed in standby at other times. The enabling of each respective ADC only when required reduces power consumption, and the formation of the first and second thresholds after end of packet generates a self-calibrating RSSI signal for use in enabling and disabling the IQ ADC and RSSI ADC.

The invention belongs to the technical field of network security, and discloses a network event monitoring analysis method and system, an information data processing terminal. A data acquisition layeris used for realizing acquisition of mirror image data traffic and deep packet detection. A data sharing layer is used for carrying out multi-dimensional analysis on the mirror image data traffic processed by the data acquisition layer and providing a data source for an external output interface; and the business display layer is used for realizing a security event view, a network view, a terminal view, an early warning view, a disposal event view and a work order view. According to the invention, illegal assets, behaviors, policies and threats in the network and attacks and threats outside the network can be effectively discovered and early warned in time; various response modes are provided to help enterprises to discover security threats and risks in advance, timely inform enterprise managers or security equipment to complete blocking of the threats and spreading of the risks, ensure asset and information security and control security events within a minimum range.

Disclosed are Bridging circuitries (BC100), and access points comprising BC100, which may be adapted to perform signal interfacing, signal conditioning, signal analysis and/or other signal processing to signals passing between RF Chains and Baseband Modem Circuits (BBMC), wherein interfacing, conditioning, analysis and/or processing may include: (1) Tx beam forming, (2) Rx Beam forming, (3) per beam Rx packet detection, (4) signal analysis and characterization and (4) MIMO spatial expansion. BC100 may include signal processing circuitry adapted to perform simultaneous multi-DOA estimation and packet detection upon multiple beams. BC100 may also be adapted to coordinate operation of the RF Chains and BBMC relative to one another. BC100 may also comprise memory for storing signal characteristics which may be utilized to improve its operation

The invention discloses a method for identifying internet application based on dynamic deep packet detection and relates to a method for identifying the internet application. in the method, an access control list module (10) and a deep packet detection module (20) are comprised; a dynamic deep packet detection strategy generating module (30) is arranged; the access control list module (10), the deep packet detection module (20) and the dynamic deep packet detection strategy generating module (30) are executed sequentially; the dynamic deep packet detection strategy generating module (30) can obtain the characteristic of the internet application dynamically by characteristic statistics for the internet application; the characteristic generates a deep packet detection strategy; furthermore, the deep packet detection module (20) is used for identifying. The invention has wide identifying range, high accuracy, high processing efficiency, flexible operation, good expansibility and strong realizability and can be used for realizing not only network device function but also network analysis system function.

The invention discloses a data processing method of a WiFi integrated tester based on the IEEE802.11n standard, and aims at processing data accurately in real time and reflecting performance of pieces to be reflected when the data received by the WiFi integrated tester satisfies the IEEE802.11n standard. The method comprises that accurate synchronization can be realized by combined timing synchronization based on cross correlation of energy packet detection and local training sequence; a frequency offset value can be accurately estimated by maximum likelihood estimation of carrier-wave frequency offset assisted by time-domain data; and channel characteristic can be accurately estimated via LS channel estimation and fitting. One frame of effective data is cut from received data, frequency compensation is carried out on the data after timing synchronization and frequency offset estimation, data is demodulated after removing the cyclic prefix, channel estimation is carried out, the signal domain is parsed, phase compensation is carried out on the data to obtain the EVM, and thus, the performance of the piece to be tested is accurately reflected.

A data multiplexing apparatus (1) includes: a packet number obtainment unit (109) for obtaining the total number of packets included in one block on a private data packet stream inputted into a channel buffer (101); an address obtainment unit (110) for obtaining the address of the starting packet in each private data block; a null packet detection unit (111) for detecting null packets when a multiplexed packet stream of data other than the private data is outputted from the channel buffer (101); and a packet replacement unit (112) for replacing the multiplexed null packets detected by the null packet detection unit (111) with the private data packets and outputting the multiplexed packet stream.