Spread-spectrum code chip synchronous catching and tracing method and device of wireless sensing net node
A technology for synchronous capture and tracking devices, applied in transmission systems, code division multiplexing systems, electrical components, etc., can solve problems such as incomplete synchronization and capture, save data buffer resources, reduce synchronization requirements, and reduce energy consumption Reduced effect
Inactive Publication Date: 2010-12-15
JIAXING WIRELESS SENSOR NETWORKS CENT CAS
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Problems solved by technology
The physical layer communication scheme of the wireless sensor network usually needs to adopt the direct sequence spread spectrum scheme. However, at present, how to realize the synchronization and capture of the spread spectrum in the DSP design is not yet a perfect method and technology
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Embodiment Construction
[0043] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0044] See figure 1 , which shows a structural block diagram of the spread spectrum chip synchronization acquisition and tracking device of the present invention. Such as figure 1 As shown, it includes I-way and Q-way downconverter 10, A / D data buffer 20, I-way and Q-way branch data reading device 30, I-way code phase correction unit 50, Q-way code phase correction unit 55. I-path modified time-domain matched filter 60, Q-path modified time-domain matched filter 65, local preset PN code generator 70, energy calculation unit 80, and capture decision unit 90.
[0045]The I-path and Q-path baseband data (radio frequency signal) from the radio frequency end enters the I-path and Q-path down-converter 10 after being received by devices such as an antenna. The down-converter 10 down-converts the radio frequency signal to obtain I-channel and Q-channel baseb...
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The present invention relates to a method and a device for realizing the synchronous capture and the tracking of the frequency-spread spectrum chip in the radio sensor node of the fixed DSP. The fixed DSP has comparatively excellent data processing capacity and comparatively low energy consumption which is very fit for sensor node with high energy consumption requirements; however, no perfect DSPcan realize synchronous frequency enlargement and capture technology. The method provided by the present invention comprises the following steps that the radio frequency signal is received and implemented with the process of down-conversion to obtain the I-route and Q-route base band signals; the signals are stored in a data buffer in an interlaced way; the I-route or Q-route frequency-enlarging data are read for code phase correction; the process of judging relevant peak energy value is implemented according to the preset PN sequence locally to obtain a judged peak energy value of the I route and Q route; the values are added together to get the relevant peak energy value; based on the relevant peak energy value, the processes of synchronous capture of data sectional search and reserved tracking and pull-out detection are implemented.
Description
technical field [0001] The invention relates to a method and device for synchronous acquisition and tracking of spread spectrum code chips, which are suitable for wireless sensor network nodes, in particular to wireless sensor nodes realized by fixed-point digital signal processors (DSP). Background technique [0002] At this stage, many fields have put forward a huge demand for sensor applications that have wireless communication capabilities and can self-organize networks. For example, smart home, environmental monitoring, industrial control, field exploration, military reconnaissance, etc., but these new requirements have put forward requirements for wireless sensor nodes with low energy consumption and certain data processing and network communication capabilities. At present, the design of wireless sensor nodes is still immature, and most of the nodes are based on system integration, implemented by FPGA, and driven by clocks to perform calculations at each step. Howeve...
Claims
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IPC IPC(8): H04B1/707H04J13/02H04B1/7075H04B1/7093
Inventor 沈杰陈卓
Owner JIAXING WIRELESS SENSOR NETWORKS CENT CAS