CN101188538B - An interference signal generation device for car self-organization network - Google Patents
An interference signal generation device for car self-organization network Download PDFInfo
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- CN101188538B CN101188538B CN2007103041037A CN200710304103A CN101188538B CN 101188538 B CN101188538 B CN 101188538B CN 2007103041037 A CN2007103041037 A CN 2007103041037A CN 200710304103 A CN200710304103 A CN 200710304103A CN 101188538 B CN101188538 B CN 101188538B
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Abstract
The invention relates to a car self-organizing network interference signal generator which consists of a channel selection and control module, an MAC unit and a baseband processor, an I / O modulation demodulation, an intermediate frequency (IF) and radio frequency (RF) processing unit, an antenna, etc. A bus interface adopts a USB pattern. The invention has three selective operating methods, each operating method can utilize a control module or a control program to realize the control on the channel scanning, thereby achieving the channel selection function and the power adjustment function. The generator can send out a physical signal according to the standards stipulated by IEEE802.11b. The invention has good practicality and programmability, and belongs to the inter-vehicle networking communication field, thereby being suitable for the testing of an inter-vehicle communication system.
Description
Technical field
The invention belongs to connected network communication field between vehicle, a kind of interference signal generation device for car self-organization network is provided, be mainly used in the performance test of car-mounted terminal in group-net communication based on self-organizing network.
Background technology
In the MANET vehicular communication system, requirement vehicle communication terminal in various possible communication environments can both keep the excellent communications quality.But because each vehicle is in high-speed moving state, and is subjected to the influence of practical communication environment, the inter-vehicular communication signal can be interfered and lose, thus influence communication, so must test to the communication quality between vehicle under the various environment.Test cost is big in actual environment, environment is uncontrollable, and general signal generator costs an arm and a leg, volume is big, it is complicated to use, and uses inconvenience in the test of car self-organization network communication system.And the interference signal generator is exactly the various interference signals that are used for simulating vehicular communication system in the practical work process, therefore the interference signal generator at car-mounted terminal can play very big effect in the vehicle communication network system, makes things convenient for system debug and performance test.
WLAN (wireless local area network) IEEE802.11b agreement has defined 14 channels altogether on the 83.5MHz bandwidth.The centre frequency of channel number and correspondence thereof is referring to 802.11 protocol specification files.In China, observe relevant wireless frequency planning, support wherein 11 channels.IEEE802.11b physical layer signal bandwidth is 22MHz, occupies to surpass 4 channel widths.
Summary of the invention
Purpose of the present invention is exactly the interference signal generator that satisfies IEEE 802.11b transformat of a kind of special use of design.
Interference signal generation device for car self-organization network partly is made up of channel selection and control module, MAC unit and baseband processor (BBP), I/O modulation, intermediate frequency (IF) and radio frequency (RF) processing unit and antenna etc.The function of MAC unit and baseband processor (BBP) adopts ISL3873 to realize; Intermediate frequency (IF) and radio frequency (RF) processing unit adopt ISL3685 to realize, the function of I/O modulation adopts HFA3783 to realize that antenna part is connected to form by antenna and power amplifier, built-in 2.4G wave detector; Channel is selected and control module adopts single-chip microcomputer and peripheral circuit to realize.
Wherein, channel is selected and control module connects MAC unit and baseband processor (BBP), MAC unit and baseband processor (BBP) connect the I/O modem module, the I/O modem module connects intermediate frequency (IF) and radio frequency (RF) processing unit, and intermediate frequency (IF) links to each other with antenna with radio frequency (RF) processing unit and carries out the processing of radiofrequency signal.MAC has realized the unit MAC layer function of WLAN (wireless local area network) (IEEE802.11b) standard, mainly is responsible for access control, is the interface between baseband processing unit and the control module.When control circuit had data to send, MAC was responsible for the unit data that reception control circuit sends, and the form encapsulation framing according to 802.11b sends to Frame in the channel according to the multiple access access protocol then and goes.When receiving data, the MAC unit judges whether to mail to the data of this machine according to the destination address of received frame, if then receive this frame information, and then data are submitted to control module.In order to realize the function of transceive data, the MAC unit need manage sending and receive buffer memory, and the MAC unit is by bus interface and I/O operation, with the control module swap data.
BBP, IF, three unit of RF are used for realizing physical layer function (serial/parallel conversion, modulating/demodulating, spread spectrum/despreading, add/unwinding, enciphering/deciphering etc.), and carry out necessary information exchange with the MAC unit.Modulated earlier by baseband processor when sending data, the signal after the modulation of IF processing unit handle is upconverted on the radio frequency by the RF unit and is gone out by aerial radiation after upconverting to and carrying out the amplification filtering processing on the intermediate frequency carrier.Carry out opposite process during Data Receiving.When physical layer receive signal and confirm error-free after, submit to the MAC-PHY sublayer, giving MAC layer on the data,, extract desired parameters through the back of unpacking as long as promptly Frame is resolved after the MAC layer receives data, do not judge whether to issue this signal generator.If the data that physical layer receives are wrong, then abandon these data and wait for the next frame data.When signal generator sends detection data, send data according to the channel sequence that sets.Because the present invention adopts the time division duplex mode of operation, so, can not receive during transmission, can not send during reception.
Hardware of the present invention is formed complete signal generation apparatus of formation, can also can use separately by divorced from computer by USB interface and computer exchange of information.The present invention had three kinds of working methods when divorced from computer used, can select by the toggle switch that links to each other with control module, and configuration corresponding indicating signals lamp.
Under first kind of working method, after interference signal generation device powers on, at first carry out scan channel according to the channel list that meets the 802.11b standard of storing in the control module, channel list can be made amendment by the control module source program.The present invention includes two kinds of scan channel modes: passive mode and active mode, can select by button.Under passive scan channel mode, each channel is monitored in turn, and deposit the signal frame that each is received in buffer memory, since each signal frame comprise can with all parameters of basic service group coupling, therefore according to sending interference signal at this channel after institute's containing parameter is provided with in the Frame.Under the active channel scan mode, send explore frame at each channel at first successively, explore frame can be asked network to send one and be returned frame, returns frame, then definite this channel transmission interference signal of using if receive.During active channel scanning, at each channel a stand-by period t can be set, the t value evenly distributes between 50 milliseconds to 200 milliseconds, and the stand-by period is to then switching to next channel.
Under second kind of working method, earlier each chip and register are carried out initialization in the system back that powers on, then according to the toggle switch signal, order or according to the random sequence switch operating channel that presets is provided with an operating time t at each working channel
1, t
1Value evenly distributes between 100 milliseconds to 500 milliseconds, and the operating time is to then switching to next channel and stand-by period t
2, t
2Value evenly distributes between 10 milliseconds to 200 milliseconds.
Under the third working method, use four toggle switchs to come from 11 alternative working channels, to select one, at each working channel an operating time t is set
1, t
1Value evenly distributed between 10 seconds to 20 seconds, and the operating time switches to next channel and stand-by period t to then reading corresponding toggle switch state again if the toggle switch state changes
2The back sends interference signal, t
2Value evenly distributes between 10 milliseconds to 200 milliseconds.If changing, do not continue the toggle switch state in current channel work.
Under above three kinds of working methods, signal transmission power has 12.5%, 25%, 50%, 100% 4 kind of selection, selects automatically by two toggle switchs or control program, and the priority of toggle switch is higher than procedure Selection.
The invention has the advantages that: designed a kind of vehicle group-net communication testing apparatus of special use, made things convenient for test the inter-vehicular communication signal quality.The present invention can select transmitting power by the manual adjustment working channel in use simultaneously.
Description of drawings
Fig. 1 is a hardware composition frame chart of the present invention, antenna and power amplifier, built-in 2.4G wave detector constitute antenna part jointly, 2.4GHzRF/IF transducer and voltage controlled oscillator constitute intermediate frequency and RF processing unit jointly, I/O demodulation and modulation and voltage controlled oscillator constitute I/O modulation device jointly, and Base-Band Processing and MAC, SRAM, FLASH constitute MAC unit and baseband processor jointly.
Fig. 2 is system initialization of the present invention and workflow diagram, it mainly is that System on Chip/SoC initialization and reception are made judgement then from the toggle switch and the push button signalling of control module, thereby the detection operations channel, and can carry out manual or automatic channel switching.
Embodiment
A kind of interference signal generation device for car self-organization network that satisfies IEEE 802.11b transformat of special use, select and control module by channel, MAC unit and baseband processor (BBP), the I/O modulation, intermediate frequency (IF) and radio frequency (RF) processing unit and antenna etc. are partly formed, bus interface adopts the USB form, the function of MAC unit and baseband processor (BBP) adopts ISL3873 to realize, intermediate frequency (IF) and radio frequency (RF) processing unit adopt ISL3685 to realize, the function of I/O modulation adopts HFA3783 to realize, channel is selected and control module connects the MAC unit, MAC unit and baseband processor (BBP) connect the I/O modem module, the I/O modem module connects intermediate frequency (IF) and radio frequency (RF) processing unit, and intermediate frequency (IF) links to each other with antenna with radio frequency (RF) processing unit and carries out the processing of radiofrequency signal.
ISL3685 is conversion of 2.4GHz radio frequency/intermediate frequency and frequency mixer, but there is the reception gain amplifier inside, and input signal produces intermediate-freuqncy signal and sends into next stage through filter and local oscillation signal mixing.ISL3685 inside has the phase-locked loop of 2.4G.HFA3983 is the detector of 2.4GHz built-in power amplifier.The baseband signal of coming from ISL3685 with mix through phase-locked radiofrequency signal, in the HFA3983 power amplifier, after the amplification, launch through filtering.HFA3783 is intermediate frequency quadrature modulation and demodulation and mixer chip, can modulation and demodulation I/O signal, have very high integrated level, integrated AGC receives intermediate frequency amplifier, and frequency response reaches 600MHz, and gain reaches 70dB, and AGC has the gain controlling of 70dB, and inside has phase-locked loop control.The HFA3783 chip carries out the conversion of intermediate frequency to base band, also needs by the corresponding configuration mouth mode of operation and operating frequency etc. to be carried out the configuration of register.Base-Band Processing that ISL3873 is integrated and MAC function, Base-Band Processing wherein partly is with rake (Rake) to receive and equalizer, be that the high performance Direct-Spread baseband processor of a kind of high efficiency, Rayleigh receive and equalizer, A/D and D/A are arranged to Simulation with I and Q input and output in its sheet, modulation has good data capture ability with DBPSK and DQPSK, can utilize sufficient key that variable data ratio is provided, when emission and reception, AGC can provide maximum efficient.
The present invention can also can use separately by divorced from computer by USB interface and computer exchange of information.
The present invention had three kinds of working methods when divorced from computer used, can select by the toggle switch that links to each other with control module, and configuration corresponding indicating signals lamp.
Under first kind of working method, after interference signal generation device powers on, at first carry out scan channel according to the channel list that meets the 802.11b standard of storing in the control module, channel list can be made amendment by the control module source program.The present invention includes two kinds of scan channel modes: passive mode and active mode, can select by button.Under passive scan channel mode, each channel is monitored in turn, and deposit the signal frame that each is received in buffer memory, since each signal frame comprise can with all parameters of basic service group coupling, therefore according to sending interference signal at this channel after institute's containing parameter is provided with in the Frame.Under the active channel scan mode, send explore frame at each channel at first successively, explore frame can be asked network to send one and be returned frame, returns frame, then definite this channel transmission interference signal of using if receive.During active channel scanning, at each channel a stand-by period t can be set, the t value evenly distributes between 50 milliseconds to 200 milliseconds, and the stand-by period is to then switching to next channel.
Under second kind of working method, earlier each chip and register are carried out initialization in the system back that powers on, then according to the toggle switch signal, order or according to the random sequence switch operating channel that presets is provided with an operating time t at each working channel
1, t
1Value evenly distributes between 100 milliseconds to 500 milliseconds, and the operating time is to then switching to next channel and stand-by period t
2, t
2Value evenly distributes between 10 milliseconds to 200 milliseconds.
Under the third working method, use four toggle switchs to come from 11 alternative working channels, to select one, at each working channel an operating time t is set
1, t
1Value evenly distributed between 10 seconds to 20 seconds, and the operating time switches to next channel and stand-by period t to then reading corresponding toggle switch state again if the toggle switch state changes
2The back sends interference signal, t
2Value evenly distributes between 10 milliseconds to 200 milliseconds.If changing, do not continue the toggle switch state in current channel work.
Under above three kinds of working methods, signal transmission power has 12.5%, 25%, 50%, 100% 4 kind of selection, selects automatically by two toggle switchs or control program, and the priority of toggle switch is higher than procedure Selection.
Claims (3)
1. interference signal generation device for car self-organization network comprises the channel selection that connects successively and control module, MAC unit, baseband processor-BBP, I/O modem module, intermediate frequency-IF and radio frequency-RF processing unit, antenna part; Bus interface adopts the USB form; This device can or adopt divorced from computer to use by USB interface and computer exchange of information, working channel is manually or automatically to switch, it is characterized in that: when divorced from computer uses, have three working methods, select by the toggle switch that links to each other with control module, and configuration corresponding indicating signals lamp;
Working method 1: after interference signal generation device powers on, at first carry out scan channel according to the channel list that meets the 802.11b standard of storing in the control module, channel list is made amendment by the control module source program, the scan channel mode has passive mode and active mode, select by button, under passive scan channel mode, each channel is monitored in turn, and deposit the signal frame that each is received in buffer memory, because each signal frame comprises all parameters with basic service group coupling, therefore according to sending interference signal at this channel after institute's containing parameter is provided with in the Frame; Under the active channel scan mode, send explore frame at each channel at first successively, explore frame can be asked network to send one and be returned frame, then determines to use this channel to send interference signal when returning frame when receiving; During active channel scanning, at each channel a stand-by period t can be set, the t value evenly distributes between 50 milliseconds to 200 milliseconds, and the stand-by period is to then switching to next channel;
Working method 2: earlier each chip and register are carried out initialization in the system back that powers on, then according to the toggle switch signal, order or according to the random sequence switch operating channel that presets is provided with an operating time t at each working channel
1, t
1Value evenly distributes between 100 milliseconds to 500 milliseconds, and the operating time is to then switching to next channel and stand-by period t
2, t
2Value evenly distributes between 10 milliseconds to 200 milliseconds;
Working method 3: use four toggle switchs to come from 11 alternative working channels, to select one, an operating time t is set at each working channel
1, t
1Value evenly distributed between 10 seconds to 20 seconds, and the operating time when the toggle switch state changes, then switches to next channel and stand-by period t to then reading corresponding toggle switch state again
2The back sends interference signal, t
2Value evenly distributes between 10 milliseconds to 200 milliseconds, does not then continue in current channel work when the toggle switch state changes.
2. interference signal generation device for car self-organization network as claimed in claim 1 is characterized in that, working method 1 time, has initiatively and carries out institute's containing parameter in channel detection and the read data frame with passive two kinds of scan channel patterns; Working method 2 times, can read the toggle switch signal sequence and select working channel or service routine to select working channel according to presetting random sequence; Working method 3 times, use four toggle switchs manually to select one of 11 alternative channels as working channel, switch to any channel by toggle switch in the course of the work.
3. interference signal generation device for car self-organization network as claimed in claim 1 is characterized in that: under any one working method signal transmission power have 12.5%, 25%, 50%, 100% 4 kind of selection, select by toggle switch.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007103041037A CN101188538B (en) | 2007-12-25 | 2007-12-25 | An interference signal generation device for car self-organization network |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007103041037A CN101188538B (en) | 2007-12-25 | 2007-12-25 | An interference signal generation device for car self-organization network |
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| CN101188538A CN101188538A (en) | 2008-05-28 |
| CN101188538B true CN101188538B (en) | 2010-04-14 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1684434A (en) * | 2004-09-28 | 2005-10-19 | 中山大学 | Simulating method for radio data communication |
| CN1777072A (en) * | 2004-11-15 | 2006-05-24 | 普天信息技术研究院 | Mobile channel andloging method |
| CN1849822A (en) * | 2003-05-20 | 2006-10-18 | 韩国电子通信研究院 | On-channel repeating apparatus and method for terrestrial digital television broadcasting service |
| CN1878161A (en) * | 2005-06-09 | 2006-12-13 | Vixs系统公司 | Increased data rate transmissions of a wireless communication |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1849822A (en) * | 2003-05-20 | 2006-10-18 | 韩国电子通信研究院 | On-channel repeating apparatus and method for terrestrial digital television broadcasting service |
| CN1684434A (en) * | 2004-09-28 | 2005-10-19 | 中山大学 | Simulating method for radio data communication |
| CN1777072A (en) * | 2004-11-15 | 2006-05-24 | 普天信息技术研究院 | Mobile channel andloging method |
| CN1878161A (en) * | 2005-06-09 | 2006-12-13 | Vixs系统公司 | Increased data rate transmissions of a wireless communication |
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