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1035 results about "Data packing" patented technology

Method with strong anti-multi-path capability for processing moveable underwater sound communication signal

The invention relates to a method with strong anti-multi-path capability for processing moveable underwater sound communication signals, including two parts, namely a transmitter processing method and a receiver processing method, wherein the transmitter processing method includes the operations of error correction of coding, data packing, digital interpolation, base band shaping wave filtering, upper modified frequency modulation, and the like; and the receiver processing method includes the operations of digital wave filtering, frame synchronous judgment, preliminary compensation of Dopplerfrequency shift, lower modified frequency modulation, bit synchronous judgment, fine compensation of Doppler frequency shift, digital equalization, error correction of decoding, etc. The invention carries out the intercrossing treatment on technologies of synchronous judgment, compensation of Doppler frequency shift, compensation of multi-path effect, and the like, and guarantees that under the environment of strong Doppler frequency shift, the system can realize the accurate synchronism of signals and carries out real-time estimation and compensation on the effect of strong Doppler frequencyshift; and the adopted blind equalization method can carry out effective tracking compensation on the time varying multi-path effect of an underwater sound signal channel, thereby greatly increasing the integral stability and the bit error rate performance of an underwater sound communication system and enduing the system with the capability of reliable communication during movement.
Owner:NAVAL UNIV OF ENG PLA

Real-time packet loss recovery method, system and receiving terminal unit

The invention discloses a real-time message packet loss recovery method, a real-time message packet loss recovery system and a receiving end unit. The method comprises that: the receiving end statistizes the time length consumed by packet retransmission (retransmission consumption), a time length consumed by a non-retransmitting packet from being placed into a framing buffer to being sent into a decoder is taken as a retransmission time window; the sending end packs the data into a real-time message, then sends the real-time message to the receiving end and stores the data at the same time; when the receiving end finds the packet loss, if that the retransmitting consumption is not greater than a retransmitting time window is confirmed, the receiving end sends a retransmitting request to the sending end, the current time is confirmed as the initial time of the retransmitting time window at the same time, the sending end packs the data which is stored and needs to be retransmitted into a message and then sends the message to the receiving end; the receiving end receives the retransmitted data sent by the sending end before the finish time of the retransmitting time window, the retransmitted data is inserted into the framing buffer. The invention reduces the network band width occupied by recovering packet loss under the premise of assuring the real time of data transmission.
Owner:NEW H3C TECH CO LTD

Orchard planting monitoring system based on wireless sensor networks and monitoring method thereof

The invention discloses an orchard planting monitoring system based on wireless sensor networks and a monitoring method thereof. The system comprises a plurality of wireless sensor networks comprisinga plurality of wireless sensor nodes, gateway nodes, a communication server connected with the gateway nodes and a host monitoring machine connected with the communication server. The method comprises the following steps: 1. self-organizing the plurality of wireless sensor networks by the plurality of wireless sensor nodes and transmitting monitoring data to the gateway nodes after collection atregular time, and then packing and transmitting the monitoring data to the communication server by the gateway nodes; 2. transmitting the monitoring data to the host monitoring machine by the communication server; and 3. pretreating the monitoring data and removing pseudo data by the host monitoring machine, and transferring an expert system for analyzing and processing the monitoring data and making a corresponding mentoring program. The invention has the advantages of reasonable design, low cost, simple and convenient operation, good monitoring effect and high degree of intelligence, provides the effective guiding scheme for peasant household and can carry out warning on the peasant household in real time.
Owner:XIAN CENTN TECH
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