CN101814925B - Wireless sensor node system adopting cognitive radio technology and control method thereof - Google Patents
Wireless sensor node system adopting cognitive radio technology and control method thereof Download PDFInfo
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Abstract
The invention relates to a wireless sensor contact system adopting a cognitive radio technology, which is convenient to use in a rural field environment and is characterized by comprising a transmitting end and a receiving end, wherein the transmitting end comprises nine modules: a signal source, a signal source redundancy treatment module, a simplified Huffman encoding unit, a signal source scrambling code encoding unit, a channel Hamming error detection and error correction encoding, an LISA clock encoding, a data fusion module, an RF (Radio Frequency) wireless transmission module and a communication quality identification encoding; the receiving end comprises seven modules: a wireless receiving module, a clock extraction module, a decoding module of the channel error detection and error correction Hamming encoding, a decoding module of signal source scrambling code encoding, a decoding module of signal source Huffman encoding, a signal reconstruction module and a communication qualityencoding recovery module, wherein the clock extraction module is based on an LISA algorithm; and the signal reconstruction module is positioned on the receiving end after signal source redundancy treatment. The invention also discloses a control method of the wireless sensor node system.
Description
Technical field
The invention belongs to wireless senser contact system field, especially a kind ofly have that communication quality is good, stable signal transmission, cost is low and the wireless senser contact system of the employing cognitive radio technology especially being convenient to use in the rural area wild environment.
Background technology
At present, the hardware of wireless senser contact system commonly used is complicated, and the communication signal transmission of system is unstable, is very limited in the use of rural area wild environment.
Summary of the invention
The purpose of this invention is to provide a kind ofly have that communication quality is good, stable signal transmission, cost is low and wireless senser contact system and the control method thereof of the employing cognitive radio technology especially being convenient to use in the rural area wild environment.
Technical scheme of the present invention is: adopt the wireless sensor node system of cognitive radio technology, it is characterized in that being comprised of transmitting terminal and receiving terminal, wherein transmitting terminal is comprised of nine modules: information source; The redundant processing module of information source, the redundant processing module of information source adopts the first-order difference function coding transmission based on Laplce's probability distribution method; Huffman coding unit behind the simplification is finished the further data compression function to information source; Information source scrambler coding unit increases information source zero crossing clock signal, provides the communication clock to align; Channel error detection, error correction Hamming coding module; LISA clock coding module, the data flow of this coding behind channel Hamming coding is combined; Data fusion module; The RF wireless transmitter module belongs to system communication physical layer (PHY) module that the IP technology is classified; Communication quality identification code, this coding module are positioned at after the Huffman coding unit behind the simplification, as the foundation of judging communication quality at receiving terminal;
Wherein, information source (A1), the redundant processing module (A2) of information source, Huffman coding unit (A3), information source scrambler coding unit (A4) and channel error detection, error correction Hamming coding module (A5) are linked in sequence; Communication quality identification code module (A9) is connected with information source scrambler coding unit (A4); Channel error detection, error correction Hamming coding module (A5), LISA clock coding module (A6) are connected respectively A7 with data fusion module) connect, data fusion module (A7) also is connected with RF wireless transmitter module (A8);
Receiving terminal is comprised of seven modules: wireless receiving module, finish demodulation function; Based on the Clock Extraction module of LISA algorithm, in order to recover extracting through the clock signal of LISA clock code signal; The decoder module of channel error detection, error correction Hamming coding; The decoder module of information source scrambler coding; The decoder module of signal source Huffman coding; The rear signal reconstruction module at receiving terminal of the redundant processing of signal source; Communication quality code restoration module provides the parameter index that the wireless telecommunications Based Intelligent Control is carried out the cognitive radio communication;
Wherein, wireless receiving module (B1), Clock Extraction module (B2), the decoder module (B3) of channel error detection, error correction Hamming coding, the decoder module (B4) of information source scrambler coding is linked in sequence with the decoder module (B5) of signal source Huffman coding; The decoder module (B5) of signal source Huffman coding also is connected with signal reconstruction module (B6), communication quality code restoration module (B7) respectively.
Described transmitting terminal and receiving terminal mainboard are by CPU module, 232 communication modules, 232 interfaces, 485 communication modules, 485 interfaces, GPIO interface, RF module interface, RF module, sensor interface and can plug sensor assembly and form; Wherein the CPU module links to each other with 232 communication modules, 485 communication modules, GPIO interface, RF module interface and sensor interface respectively; 232 communication modules are connected with 232 interfaces; 485 communication modules are connected with 485 interfaces; The RF module interface is connected with the RF module; Sensor interface plugs the sensor assembly connection with being connected
The control method of the wireless sensor node system of cognitive radio technology is characterized in that comprising the following steps:
D1: after receiving terminal receives communication data, from receive data, extract the communication quality coding;
D2: the communication quality that receives coding is detected, if the quality of communication quality coding is higher than the threshold value of setting, execution in step D3 then, otherwise execution in step D4;
D3: continue communication;
D4: the communication quality that receives coding is detected, and judging whether increases error correction coding length, if do not increase the error correction coding yardstick, and execution in step D5 then, otherwise execution in step D6;
D5: increase error correction coding length, then execution in step D3;
D6: judge whether to increase transmitting power, if do not increase transmitting power, execution in step D7 then, otherwise execution in step D8;
D7: increase transmitting power, then execution in step D3;
D8: judge whether to expand spectrum communication, if do not expand spectrum communication then execution in step D9, otherwise execution in step D10;
D9: expansion spectrum communication, then execution in step D3;
D10: judge whether the modulated communication channel that changes, if do not change communication channel then execution in step D11, otherwise execution in step D12;
D11: transposing communication channel, then execution in step D3;
D12: judge whether to change modulation system, if change modulation system, execution in step D3 then, if do not change modulation system, execution in step D13 then.
D13: change modulation system, then execution in step D3.
Effect of the present invention is: be used for the sampling monitoring of real time environment parameter and the Wireless Data Transmission after the monitoring, the RF module of wireless senser adopts common ASK, FSK, PSK wireless-modulated mode, and it is good to have a communication quality, the characteristics of stable signal transmission.The central microprocessor of wireless sensor node (MCU) has digital signal interface and analog signal interface, the user can be linked with the varying environment transducer by pluggable mode environment is taken a sample, and sampled data is stored in the flash memories of wireless sensor node (dataflash).The present invention has introduced cognitive radio technology, so that node has the characteristics of intelligence identification communication quality, selecting modulation mode, selection coded system and optimization transmitting power, thereby has reached brief optimization so that the hardware of whole system forms.The management of whole system realizes by embedded software, based on the wireless sensor node technology of cognitive radio, has that communication quality is good, the characteristics of stable signal transmission, especially is convenient to use in the rural area wild environment.
The present invention is described further below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is the circuit block diagram of transmitting terminal of the present invention;
Fig. 2 is the circuit block diagram of receiving terminal of the present invention;
Fig. 3 is system board circuit block diagram of the present invention;
Fig. 4 is program flow chart of the present invention.
Embodiment
Adopt the wireless sensor node system of cognitive radio technology, it is characterized in that being formed by transmitting terminal and receiving terminal.
Among Fig. 1, transmitter unit (TX) is comprised of nine modules: information source A1; The redundant processing module A2 of information source adopts the first-order difference function coding transmission based on Laplce's probability distribution method; Huffman coding unit A3 behind the simplification finishes the further data compression function to information source; Information source scrambler coding unit A4 increases information source zero crossing clock signal, provides the communication clock to align; Channel Hamming error detection and error correction coding A5; LISA clock coding A6, the data flow of this coding behind channel Hamming coding is combined; Data fusion module A7; RF wireless transmitter module A8, i.e. the system communication physical layer (PHY) of IP technology classification; Communication quality identification code A9, this coding are inserted into after the Huffman coding unit behind the simplification, as the foundation of judging communication quality at receiving terminal.The management of whole system is realized by embedded software.It is good to have a communication quality based on the wireless sensor node technology of cognitive radio, the characteristics of stable signal transmission.
Among Fig. 2, receiving element (RX) is comprised of seven modules: wireless receiving module B1, finish demodulation function, and its demodulation mode is the inverse operation of radiation pattern; Based on the Clock Extraction module B2 of LISA algorithm, in order to recover extracting through the clock signal of LISA clock code signal; Decoder module B3 to channel error detection, error correction Hamming coding; Decoder module B4 to information source scrambler coding; Decoder module B5 to signal source Huffman coding; To the rear signal reconstruction module B6 at receiving terminal of the redundant processing of signal source; Communication quality code restoration module B7 provides the wireless telecommunications Based Intelligent Control, carries out the parameter index of cognitive radio communication.
Among Fig. 3, transmitting terminal and receiving terminal mainboard are by CPU module C1,232 communication module C2,232 interface C3,485 communication module C4,485 interface C5, GPIO interface C6, RF module interface C7, RF module C8, sensor interface C9 and can plug sensor assembly C10 and form; Wherein CPU module C1 links to each other with 232 communication module C2,485 communication mould C4, GPIO interface C6, RF module interface C7 and sensor interface C9 respectively; 232 communication module C2 are connected with 232 interface C3; 485 communication module C4 are connected with 485 interface C5; RF module interface C7 is connected with RF module C8; Sensor interface C9 plugs sensor assembly C10 connection with being connected.
RISC CPU module C1, this module contains CPU, contains the read-only ROM internal memory that is useful on storage solidification software program, contains the read-write memory ram, and its function is used memory headroom for the computing of application software that embedded system CPU is provided etc.;
232 communication module C2 realize the level conversion function, thereby finish 232 serial communication functions.This module provides embedded system and other RS232 equipment to carry out serial communication.Also support simultaneously and the serial communication of notebook computer, can be used for the functions such as field software upgrading and error detection; 232 interface C3; 485 communication module C4 realize the differential level conversion, thereby finish 485 serial communication functions; 485 interface C5; GPIO interface C6 is used for system extension; RF module interface C7; RF module C8; Sensor interface C9, one this interface is digital interface, supports the digital signal of digital sensor input.Another is analog interface, supports the analog signal of analog sensor input; Can plug sensor assembly C10.
Among Fig. 4, the control method of the wireless sensor node system of cognitive radio technology comprises the following steps:
D1 is after the Rx termination is received communication data, extracts the communication quality coding from receive data, and the communication quality coding that receives is detected, shown in D2.
If the quality of communication quality coding is higher than the threshold value of setting, then proceed wireless telecommunications; Otherwise communication quality is lower than the threshold value of setting, and then receiving terminal RX notice transmitting terminal TX increases error correction coding length, then enters D3 and continue communication in the situation that increases error correction coding length.
After increasing error correction coding length, continue communication.After the RX termination is received communication data, from receive data, extract the communication quality coding, and the communication quality coding that receives is detected.If the communication quality coding quality is higher than the threshold value of setting, then proceed wireless telecommunications; Otherwise judging whether increases error correction coding length, shown in D4.If do not increase the error correction coding yardstick, then increase error correction coding length such as D5, otherwise then judge whether to have increased transmitting power D6.If do not increase transmitting power, then receiving terminal RX notice transmitting terminal TX increases transmitting power.Then in the situation that increases transmitting power, continue communication.
After increasing code length and transmitting power, continue communication, after the RX termination is received communication data, from receive data, extract the communication quality coding, and the communication quality coding that receives is detected.If the communication quality coding quality is higher than the threshold value of setting, then proceed wireless telecommunications.Otherwise judging whether increases error correction coding length, if not then increase error correction coding length, otherwise then judges whether to have increased transmitting power D6.If not then increase transmitting power D7.Otherwise then receiving terminal RX notice transmitting terminal TX expands spectrum communication.
After increasing code length, transmitting power and expansion spectrum communication, continue communication, after the RX termination is received communication data, from receive data, extract the communication quality coding.And the communication quality that receives coding detected.If the communication quality coding quality is higher than the threshold value of setting, then proceed wireless telecommunications.Otherwise judging whether increases error correction coding length, if not then increase error correction coding length, otherwise then judges whether to have increased transmitting power.If not then increase transmitting power; Then judge whether to have expanded spectrum communication D8, if not then expand spectrum communication D9.Behind the expansion spectrum communication, judge whether the modulated communication channel D10 that changes, if there is not then receiving terminal RX notice transmitting terminal TX hop jump communication channel D11.Behind the hop jump communication channel, continue communication.
After increasing code length, transmitting power, expansion spectrum communication, hop jump communication channel, continue communication, after the RX termination is received communication data, from receive data, extract the communication quality coding.And the communication quality that receives coding detected.If the communication quality coding quality is higher than the threshold value of setting, then proceed wireless telecommunications.Otherwise judging whether increases error correction coding length, if not then increase error correction coding length, otherwise then judges whether to have increased transmitting power.If not then increase transmitting power; Then judge whether to have expanded spectrum communication, if not then expand spectrum communication.Otherwise then judge whether hop jump communication channel, if do not have then hop jump channel, then hop jump communication channel.Otherwise then judge whether to have changed modulation system D12.If changed communication modes, then in this manner communication.
Claims (3)
1. adopt the wireless sensor node system of cognitive radio technology, it is characterized in that being comprised of transmitting terminal and receiving terminal, wherein transmitting terminal is comprised of nine modules: information source (A1); The redundant processing module (A2) of information source, the redundant processing module of information source adopts the first-order difference function coding transmission based on Laplce's probability distribution method; Huffman coding unit (A3) behind the simplification is finished the further data compression function to information source; Information source scrambler coding unit (A4) increases information source zero crossing clock signal, provides the communication clock to align; Channel error detection, error correction Hamming coding module (A5); LISA clock coding module (A6), the data flow of this coding behind channel Hamming coding is combined; Data fusion module (A7); RF wireless transmitter module (A8) belongs to system communication physical layer (PHY) module that the IP technology is classified; Communication quality identification code module (A9), this coding module are positioned at after the Huffman coding unit behind the simplification, as the foundation of judging communication quality at receiving terminal;
Wherein, information source (A1), the redundant processing module (A2) of information source, Huffman coding unit (A3), information source scrambler coding unit (A4) and channel error detection, error correction Hamming coding module (A5) are linked in sequence; Communication quality identification code module (A9) is connected with information source scrambler coding unit (A4); Channel error detection, error correction Hamming coding module (A5), LISA clock coding module (A6) are connected respectively A7 with data fusion module) connect, data fusion module (A7) also is connected with RF wireless transmitter module (A8);
Receiving terminal is comprised of seven modules: wireless receiving module (B1), finish demodulation function; Based on the Clock Extraction module (B2) of LISA algorithm, in order to recover extracting through the clock signal of LISA clock code signal; The decoder module (B3) of channel error detection, error correction Hamming coding; The decoder module (B4) of information source scrambler coding; The decoder module (B5) of signal source Huffman coding; The rear signal reconstruction module (B6) at receiving terminal of the redundant processing of signal source; Communication quality code restoration module (B7) provides the parameter index that the wireless telecommunications Based Intelligent Control is carried out the cognitive radio communication;
Wherein, wireless receiving module (B1), Clock Extraction module (B2), the decoder module (B3) of channel error detection, error correction Hamming coding, the decoder module (B4) of information source scrambler coding is linked in sequence with the decoder module (B5) of signal source Huffman coding; The decoder module (B5) of signal source Huffman coding also is connected with signal reconstruction module (B6), communication quality code restoration module (B7) respectively.
2. the wireless sensor node system of employing cognitive radio technology according to claim 1 is characterized in that described transmitting terminal and receiving terminal mainboard by CPU module (C1), 232 communication modules (C2), 232 interfaces (C3), 485 communication modules (C4), 485 interfaces (C5), GPIO interface (C6), RF module interface (C7), RF module (C8), sensor interface (C9) and can plug sensor assembly (C10) forming; Wherein CPU module (C1) links to each other with 232 communication modules (C2), 485 communication modules (C4), GPIO interface (C6), RF module interface (C7) and sensor interface (C9) respectively; 232 communication modules (C2) are connected with 232 interfaces (C3); 485 communication modules (C4) are connected with 485 interfaces (C5); RF module interface (C7) is connected with RF module (C8); Sensor interface (C9) plugs sensor assembly (C10) connection with being connected.
3. the control method of the wireless sensor node system of employing cognitive radio technology as claimed in claim 1 or 2 is characterized in that comprising the following steps:
D1: after receiving terminal receives communication data, from receive data, extract the communication quality coding;
D2: the communication quality that receives coding is detected, if the quality of communication quality coding is higher than the threshold value of setting, execution in step D3 then, otherwise execution in step D4;
D3: continue communication;
D4: the communication quality that receives coding is detected, and judging whether increases error correction coding length, if do not increase error correction coding length, and execution in step D5 then, otherwise execution in step D6;
D5: increase error correction coding length, then execution in step D3;
D6: judge whether to increase transmitting power, if do not increase transmitting power, execution in step D7 then, otherwise execution in step D8;
D7: increase transmitting power, then execution in step D3;
D8: judge whether to expand spectrum communication, if do not expand spectrum communication then execution in step D9, otherwise execution in step D10;
D9: expansion spectrum communication, then execution in step D3;
D10: judge whether the modulated communication channel that changes, if do not change communication channel then execution in step D11, otherwise execution in step D12;
D11: transposing communication channel, then execution in step D3;
D12: judge whether to change modulation system, if change modulation system, execution in step D3 then, if do not change modulation system, execution in step D13 then.
D13: change modulation system, then execution in step D3.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2899309Y (en) * | 2006-05-15 | 2007-05-09 | 浙江万里学院 | Multi-node radio-frequency data transmitting system |
| CN200956581Y (en) * | 2006-09-27 | 2007-10-03 | 鞍山银宇电子科技有限公司 | Wireless digital multifunctional transmitter |
| JP2009267797A (en) * | 2008-04-25 | 2009-11-12 | Kyocera Corp | Wireless communication system, wireless transmitting apparatus, wireless receiving apparatus, and wireless communication method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2899309Y (en) * | 2006-05-15 | 2007-05-09 | 浙江万里学院 | Multi-node radio-frequency data transmitting system |
| CN200956581Y (en) * | 2006-09-27 | 2007-10-03 | 鞍山银宇电子科技有限公司 | Wireless digital multifunctional transmitter |
| JP2009267797A (en) * | 2008-04-25 | 2009-11-12 | Kyocera Corp | Wireless communication system, wireless transmitting apparatus, wireless receiving apparatus, and wireless communication method |
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