CN105141407A - Multi-user anti-interference synchronization method and multi-user anti-interference synchronization device - Google Patents
Multi-user anti-interference synchronization method and multi-user anti-interference synchronization device Download PDFInfo
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Abstract
The invention discloses a multi-user anti-interference synchronization method and a multi-user anti-interference synchronization device. In the multi-user anti-interference synchronization method, a used frame structure comprises a leader sequence and a data part; the leader sequence has self-correlative or cross-correlated properties, so that synchronous points can be found out in the event that signal amplitudes of the leader sequence are superposed; and the leader sequence is modulated by adopting amplitudes. According to the invention, the synchronization performance of a wireless communication system is improved; and the synchronization capability of the wireless communication system under multi-user interference is improved.
Description
Technical field
The present invention relates to a kind of multi-user's anti-interference synchronous method, also relate to corresponding multi-user's anti-interference synchronization device simultaneously, belong to wireless communication technology field.
Background technology
Signal synchronization module is the basic function module in wireless communication system.After receiver enters accepting state, signal synchronization module is started working; Signal synchronization module, by processing to received signal, judges whether the signal eating dishes without rice or wine to receive is the packet sent.
The ZigBee physical layer being operated in 2.4Ghz frequency range adopts IEEE802.15.4 agreement.Every 4 information bits of ZigBee physical layer are pseudo noise (Pseudo-Noise:PN) sequence by direct sequence spread spectrum (directsequencespreadspectrum:DSSS) technology-mapped, have employed the modulation system of the offset quadraphase shift keying (offsetquadraturephaseshiftkeying:OQPSK) that half-sine pulse is shaped, mapping relations as shown in Figure 1.
The targeting sequencing of ZigBee is made up of the chip of 32 bits of symbol " 0000 " correspondence. and for improving synchronous receiving sensitivity, have employed the mode of repeated encoding, sending after namely corresponding chip repeats 8 times.Use the mode code efficiency of repeated encoding increase redundancy low, simultaneously because targeting sequencing is long, cause communication efficiency low.
Usually, be synchronously by obtaining the targeting sequencing received (preamble) process.Targeting sequencing possesses special data structure usually, needs to judge whether there is such data structure in Received signal strength at the signal transacting of receiving terminal, and the mode of employing has auto-correlation and cross-correlation two kinds of modes usually.
As shown in Figure 1, because the targeting sequencing of ZigBee is known array (chip that symbol " 0000 " is corresponding).According to the cross correlation value of the known targeting sequencing of receiver Received signal strength and this locality, the original position of each chip can be looked for, in like manner according to the cross correlation value of receiving sequence and synchronization character, the original position of Frame can be found.
In sensor network system, common Networking protocol has Leach, Leach-C etc., when agreement is in stable state, for saving the energy of node, user node generally adopts the mode of TDMA when communicating with cluster node (or Server), each user node communicates with cluster node (or Server) in specific time slot, as shown in Figure 2.
A tdma system is only had in assumptions' environment, then in this tdma system, user node and cluster node (or Server) are when corresponding communicated in time slots, other user nodes can not produce interference to this communication, and the mode of traditional repeated encoding can be adopted to promote the net synchronization capability of user node and cluster node (or Server).In systems in practice, can not ensure outside this tdma system, there is no other user nodes in transmission data, when user node communicates with cluster node (or Server), there is the interference of other user nodes.Simultaneously, if when time slot is longer or timeslot number is more, cluster node (or Server) waits for the overlong time of certain user node reported data, when certain user node detects environmental abnormality, this user node wish can in current time slots (non-this detects the time slot that abnormal user node is corresponding) reported data to cluster node (or Server), the node that now current time slots is corresponding also in transmission data, causes inter-user interference.When there is interference when between user, the algorithm performance of traditional point-to-point enhancing net synchronization capability will significantly decline.Multi-user interference model as shown in Figure 3.
In a wireless communication system, for ensureing transmission quality, the sensitivity requirement synchronous to signal usually can far above the sensitivity requirement of data portion.In the prior art, the major way improving signal synchronozing sensitivity improves redundancy (repeated encoding).For realizing receiving synchronously preferably, targeting sequencing is usually all longer.For the short bag of data of Internet of Things application, such targeting sequencing can bring very large synchronization overhead, reduces practical communication efficiency.
Summary of the invention
Primary technical problem to be solved by this invention is to provide a kind of multi-user's anti-interference synchronous method.
Another technical problem to be solved by this invention is to provide a kind of multi-user's anti-interference synchronization device.
For achieving the above object, the present invention adopts following technical scheme:
A kind of multi-user's anti-interference synchronous method, the frame structure used comprises targeting sequencing and data division, wherein said targeting sequencing has auto-correlation or their cross correlation, make can find synchronous point when superposition occurs the signal amplitude of described targeting sequencing, described targeting sequencing adopts amplitude modulation(PAM).
Wherein more preferably, described targeting sequencing and described data division adopt different modulating object.
Wherein more preferably, described targeting sequencing adopts the modulation system of On-off.
Wherein more preferably, described targeting sequencing adopts the modulation system of PAM.
Wherein more preferably, described data division adopts phase-modulation.
A kind of multi-user's anti-interference synchronization device, comprises targeting sequencing generation module and framing module,
Described targeting sequencing generation module receives known array and adopts amplitude modulation(PAM) mode generating leader sequence, sends to described framing module.
Wherein more preferably, described targeting sequencing generation module adopts the modulation system of On-off to generate described targeting sequencing.
Wherein more preferably, described targeting sequencing generation module adopts the modulation system of PAM to generate described targeting sequencing.
Wherein more preferably, also comprise data division generation module,
Described data division generation module receives information bit and adopts phase modulation method to generate data division, sends to described framing module.
A kind of multi-user's anti-interference synchronization device, comprises targeting sequencing detection module and data division detection module, and described targeting sequencing detection module utilizes amplitude detection to obtain targeting sequencing.
Compared with improving the algorithm of net synchronization capability with traditional increase redundancy (repeated encoding), the present invention has greater advantage in net synchronization capability, code efficiency, energy efficiency, increases the transmission range of wireless communication system (particularly Sensor Network) and enhances antijamming capability.Invention increases the net synchronization capability of existing wireless communications system, improve the net synchronization capability under multi-user interference, enhance the antijamming capability of existing wireless communications system.
Accompanying drawing explanation
Fig. 1 is information bit and frequency expansion sequence mapping relations figure in Zigbee protocol;
Fig. 2 is time slot schematic diagram in tdma communication system;
Fig. 3 is multi-user interference model schematic;
Fig. 4 is the transmitting terminal flow chart of multi-user's anti-interference synchronous method provided by the invention;
Fig. 5 is in the present invention, has the framing mode schematic diagram of different rates;
Fig. 6 is in the present invention, has the framing mode schematic diagram of different modulating exponent number;
Fig. 7 is in the present invention, has the framing mode schematic diagram of different carrier number;
Fig. 8 is in the present invention, has the framing mode schematic diagram of different modulating object;
Fig. 9 is the receiving terminal flow chart of multi-user's anti-interference synchronous method provided by the invention;
Figure 10 is in the second embodiment, the transmitting terminal flow chart of multi-user's anti-interference synchronous method.
Embodiment
Below in conjunction with the drawings and specific embodiments, detailed specific description is carried out to technology contents of the present invention.
Wireless communication system comprises the information transmitting terminal and information receiving end of carrying out information interaction, and wherein base station or terminal can respectively as information transmitting terminal and information receiving ends.The present invention proposes a kind of new targeting sequencing method for designing, it is according to the actual user demand of system, and design targeting sequencing, makes it can adjust its transmission means in multiple dimension, reaches better communication efficiency or the better availability of frequency spectrum.
The present invention adopts different signal rates respectively to targeting sequencing and data division.Leader portion adopts low rate to improve net synchronization capability, and data division adopts two-forty to improve efficiency of transmission.Such as, the targeting sequencing of ZigBee and the speed of data division are 250kbps.For existing ZigBee system, leader portion can adopt low rate, and data division still adopts the 250kbps in ZigBee standard.Because leader portion speed is lower, net synchronization capability is better, better net synchronization capability when can to obtain than targeting sequencing speed be 250kbps.
The present invention adopts different order of modulation respectively to targeting sequencing and data division, and leader portion adopts the modulation system of low order, and data division adopts the modulation system of high-order.Low-order-modulated can improve the net synchronization capability of signal, and high order modulation can put forward high performance efficiency of transmission.Such as make leader portion adopt the modulation system of BPSK, and data division adopt the modulation system of 16QAM.
There is multipath in wireless communication system, and multipath channel is larger on synchronous impact.For to anti-multipath, the present invention adds multiple OFDM symbol in targeting sequencing, and receiving terminal can carry out computing cross-correlation at frequency domain according to known array, looks for synchronous point.And data division adopts use single-carrier signal to improve the availability of frequency spectrum.Which enhances the weak ability of the anti-multipath of system, improves net synchronization capability.
< embodiment one >
In the present embodiment, transmitting terminal and receiving terminal pre-set the modulation system of targeting sequencing and data division, save in advance for the synchronous known array carrying out computing cross-correlation.
As shown in Figure 4, at transmitting terminal according to pre-configured modulation system (configuration 1), utilize known array generating leader sequence, the information bit needing to send is modulated according to pre-configured modulation system (configuration 2) thus generated data division.Then, targeting sequencing and data division are carried out framing and send by transmitting terminal.
Difference configuration 1 (the first configuration) and the configuration 2 (the second configuration) of targeting sequencing and data division is described in detail below in conjunction with Fig. 5 ~ Fig. 7.Different configurations refers to, transmitting terminal adopts different modulation systems to targeting sequencing and data division.
Figure 5 shows that different rates frame structure scheme: targeting sequencing adopts low rate
In traditional radio communication, targeting sequencing and Frame have identical data transfer rate.Higher character rate can strengthen the robustness of system time domain error; Lower character rate can strengthen the robustness of system error of frequency domain.For improving the net synchronization capability of system, as shown in Figure 5, the present invention proposes the different modulating character rate (configuration 1) introduced in targeting sequencing, use different time synchronous according to targeting sequencing, the targeting sequencing utilizing known array to generate can be divided into n part, every part adopts different character rate (speed 1, speed 2 ... speed n) modulate.The transmission rate of Frame does not change (configuration 2), identical with existing ZigBee standard (the existing targeting sequencing of ZigBee standard and the speed of Frame are 250kbps).
Optionally, when n equals 1, namely targeting sequencing only adopts a kind of speed, and this speed is between 250bps ~ 250kbps, and data division still adopts the 250kbps in ZigBee standard.Because targeting sequencing speed is lower, net synchronization capability is better, therefore the present invention can obtain than targeting sequencing speed better net synchronization capability when being 250kbps.
Optionally, when targeting sequencing being divided into 2 parts (n=2), targeting sequencing adopts 2 kinds of different rates, and these speed are all between 250bps ~ 250kbps.Because targeting sequencing speed is comparatively lower than data division speed, better net synchronization capability when the present invention can obtain more identical with data division speed than targeting sequencing.
Figure 6 shows that different modulating exponent number frame structure scheme: targeting sequencing adopts low-order-modulated
In scheme shown in Fig. 6, to the configuration 1 that targeting sequencing is modulated, that known array is divided into multiple part, respectively with order of modulation 1, order of modulation 2 ... order of modulation n etc. modulate, multiple parts of generating leader sequence, each several part adopts the modulation system of not same order respectively, to improve the method for net synchronization capability.The configuration 2 that data portion carries out modulating is identical with existing ZigBee standard.In ZigBee system, targeting sequencing and Frame adopt identical modulation system.The ZigBee physical layer of such as 2.4GHz adopts the modulation system (being equivalent to MSK) of OQPSK-DSSS.
Targeting sequencing is divided into n part, and every part targeting sequencing adopts different modulation systems.Be understandable that in the n part of targeting sequencing, the modulation system of part that both can be all is all not identical, and the modulation system of multiple part also can be had identical.Preferably, the order of modulation of often kind of modulation system is all low than the order of modulation of data field.
Example 1, in ZigBee system, if targeting sequencing is only divided into 1 part, i.e. n=1.Targeting sequencing adopts the modulation system of BPSK, and data division adopts the modulation system of 16QAM.
Example 2, in similar Bluetooth system, the modulation system of the Modulationindex less (0.28 ~ 0.35) that data division uses, and the sequence introducing Modulationindex=0.5 does targeting sequencing.
Figure 7 shows that different carrier number frame structure scheme: targeting sequencing adopts multi-carrier modulation
For to anti-multipath, the present invention adds multiple OFDM symbol and (is in the targeting sequencing utilizing known array conventionally to generate, selects the OFDM symbol that net synchronization capability is good in targeting sequencing.Such as, add for synchronous OFMD symbol in 802.11ac), multiple OFDM symbol time domain is averaging, and introduces IFFT/FFT modulation.By such mode, the method can obtain good net synchronization capability when large frequency deviation.As shown in Figure 7, such as, in similar IEEE802.15.4g system (smartgridstandard), targeting sequencing utilizes IFFT to modulate, form multiple OFDM symbol, data division adopts FFT modulation, uses single-carrier signal to improve the availability of frequency spectrum, thereby enhance the ability that the anti-multipath of system is weak, improve net synchronization capability.
Figure 8 shows that different modulating object frame structure scheme: targeting sequencing adopts amplitude modulation(PAM)
The present invention is directed to multi-user interference problem in phase-modulation transmission, introduce On-off modulation or amplitude modulation(PAM) (PAM), be different from the modulation system of Frame, to improve synchronizing sequence receiving sensitivity.
In a wireless communication system, auto-correlation and the good sequence of cross-correlation performance is generally selected for synchronous targeting sequencing.Targeting sequencing and Frame have identical modulation system, such as the equal MSK of the modulation system of ZigBee targeting sequencing and Frame.MSK is Continuous Phase Modulation, and this type of phase modulation technique has permanent envelope trait, power efficiency and spectrum efficiency higher.Because targeting sequencing also uses phase modulation technique, when there is multi-user interference in system, the phase place of phase place on the targeting sequencing of useful user of the targeting sequencing of interference user causes impact, makes the synchronized algorithm poor-performing based on auto-correlation and cross-correlation.
The present invention introduces On-off modulation in targeting sequencing or amplitude modulation(PAM) (PAM) resists multi-user interference, improves the net synchronization capability that there is the system of multi-user interference, as shown in Figure 8.Due to the modulation technique that On-off or PAM is based on amplitude, when there is multiple users interference, interference user causes impact on useful user in amplitude, but because targeting sequencing has excellent auto-correlation and their cross correlation, the auto-correlation of targeting sequencing or their cross correlation insensitive (when there is multi-user interference to changes in amplitude, the signal amplitude of targeting sequencing directly superposes, signal after superposition and local known array carry out related calculation, still accurately synchronous point can be found), the superposition of amplitude is less on net synchronization capability impact, avoid because targeting sequencing is all the mutual interference that phase-modulation causes, improve the net synchronization capability when there is multi-user interference.
Such as, in ZigBee system, targeting sequencing adopts the modulation system of On-off, and Frame part still adopts the modulation system of MSK, and when there is multi-user interference, the net synchronization capability of system also uses MSK fashion than targeting sequencing.
Transmitting terminal, according to itself and the predetermined frame structure of receiving terminal, sends signal.Receiving terminal then carries out demodulation according to itself and the predetermined modulation system of transmitting terminal.
As shown in Figure 9, receiving terminal, first according to configuration 1 (i.e. the modulation system of predetermined targeting sequencing), carries out demodulation by the demodulation mode of its correspondence to the information received, thus obtains targeting sequencing.Then remove targeting sequencing, recycle the demodulation mode corresponding with configuration 2 and demodulate data division.
Such as, if transmitting terminal is the different rates modulation scheme adopted, namely configuring 1 is low-rate modulated mode, and configuration 2 is high rate modulation modes, then receiving terminal first detects targeting sequencing and demodulation with the demodulation mode configuring 1 (i.e. low-rate modulated mode) corresponding.Then demodulation targeting sequencing is out removed, then to configure demodulation mode corresponding to 2 (i.e. high rate modulation mode) to demodulate data division.Also similar for other schemes, the demodulation mode according to configuration 1 correspondence demodulates targeting sequencing; Data division is demodulated according to the demodulation mode of configuration 2 correspondence again after removing targeting sequencing.
Be appreciated that phase-modulation is identical with frequency modulation(FM) essence, the data division therefore in the present invention also can use warbled mode, and targeting sequencing still uses amplitude modulation(PAM).Receiving terminal demodulating process is similar.
< embodiment two >
First embodiment describes modulation system or the framing method that transmitting terminal and receiving terminal pre-determine targeting sequencing and data division, and the second embodiment then introduces transmitting terminal according to channel estimation results, the scheme of selecting modulation mode or framing method.
With reference to Figure 10, the present embodiment comprises the following steps.
Step one: select frame structure according to channel estimation results
The performance of wireless communication system is subject to the impact of wireless channel to a great extent, as shadow fading and frequency selective fading etc., makes the propagation path between transmitter and receiver very complicated.The precision of channel estimating will directly affect the performance of whole system.In order to recover the transmission signal of transmitting terminal accurately at receiving terminal, need to adopt various measure to resist the impact of multipath effect on signal transmission.
Information transmitting terminal needs first to obtain channel estimation results, thus selects corresponding transmitting terminal modulation scheme.
Information transmitting terminal, according to channel estimation results, selects suitable framing method, adopts corresponding frame structure and receiving terminal to carry out alternately.If the channel estimation results situation that to be multi-path jamming relatively serious, then adopt different carrier frame structure scheme; If the channel estimating situation that to be multi-user interference serious, then select to adopt different modulating object frame structure scheme; If multi-path jamming or multi-user interference not serious, then can select according to traffic performance, now adopt different modulating exponent number frame structure scheme for speech business prioritizing selection; For data service prioritizing selection different rates frame structure scheme.
Step 2: targeting sequencing and Frame are modulated according to different modulating mode
Different carrier frame structure scheme, different modulating exponent number frame structure scheme, different rates frame structure scheme and different modulating object frame structure scheme, modulator approach is carried out according to frame structure selected in step one, identical with the method in the first embodiment, be not repeated herein.
Step 3: carry out framing according to selected frame structure
Transmitting terminal, according to selected frame structure, carries out corresponding modulation operations and framing.
Process needed for the framings such as modulation, existing technology can be selected, do not repeat them here.
After framing completes, the frame structure that transmitting terminal is selected to receiving terminal notice, and transmission frame.Transmitting terminal carries out framing according to its selected frame structure, and notifies this selected frame structure of receiving terminal, carries out demodulation with the modulation system that the frame structure enabling receiving terminal select according to transmitting terminal is corresponding.Be understandable that, send the step of frame structure notice to receiving terminal, before framing step (step 3), also can carry out with step 3 simultaneously.
Be appreciated that channel estimation results also only can be notified receiving terminal by transmitting terminal, by receiving terminal according to this channel estimation results, based on the mapping table of the channel estimation results preserved in advance and frame structure, judge the frame structure that transmitting terminal is selected.So just notify selected frame structure without transmitting terminal to receiving terminal.
As described in Figure 10, receiving terminal receives frame structure notice, transfers the configuration 1 (modulation system of the targeting sequencing namely in selected frame structure) of preserving in advance, carries out demodulation, thus obtain targeting sequencing by the demodulation mode of its correspondence to the information received.Then remove targeting sequencing, the recycling demodulation mode corresponding with the configuration 2 (modulation system of the data division namely in selected frame structure) of preserving in advance demodulates data division.It should be noted that, configuration 1 and configuration 2 can be kept at receiving terminal in advance, also in step 4, can be supplied to receiving terminal by transmitting terminal.
Such as, if receiving terminal notifies according to frame structure, know that transmitting terminal is the different rates modulation scheme adopted, namely configuring 1 is low-order-modulated mode, configuration 2 is high-order modulating, then receiving terminal first detects targeting sequencing and demodulation with the demodulation mode configuring 1 (i.e. low-order-modulated mode) corresponding.Then demodulation targeting sequencing is out removed, then to configure demodulation mode corresponding to 2 (i.e. high-order modulating) to demodulate data division.Also similar for other schemes, the demodulation mode according to configuration 1 correspondence demodulates targeting sequencing; Data division is demodulated according to the demodulation mode of configuration 2 correspondence again after removing targeting sequencing.
Transmitting terminal device provided by the present invention is with reference to figure 4.This device comprises targeting sequencing generation module, data division generation module, framing module.Targeting sequencing generation module receives known array and according to configuration 1 (the first configuration) generating leader sequence, sends to framing module; Data division generation module receives information bit and generates data division according to configuration 2 (the second configuration), sends to framing module.Wherein, 1 and configuration 2 difference is configured.
Receiving end device provided by the present invention is with reference to figure 9, comprise targeting sequencing detection module and data division detection module, described targeting sequencing detection module goes out described targeting sequencing according to the first configuration detection, described data division detection module generates described data division according to the second configuration, and described first configuration is different with the second configuration.With reference to figure 9, receiving terminal can also comprise removes targeting sequencing module, after detecting targeting sequencing at targeting sequencing, removes targeting sequencing, and issues data division detection module.
In sum, the present invention proposes a kind of the multi-user's anti-interference synchronous method and the device that are applied to wireless communication system.The method and device improve the net synchronization capability of system and the ability of anti-multipath jamming by the speed, order of modulation etc. changing targeting sequencing.Compared with improving the method for net synchronization capability with traditional increase redundancy (repeated encoding), the present invention has greater advantage in net synchronization capability, code efficiency, energy efficiency, increases the transmission range of wireless communication system (particularly Sensor Network) and enhances antijamming capability.Invention increases the net synchronization capability of existing wireless communications system, improve the net synchronization capability under multi-user interference, enhance the antijamming capability of existing wireless communications system.
Above multi-user's anti-interference synchronous method provided by the present invention and device are described in detail.For one of ordinary skill in the art, to any apparent change that it does under the prerequisite not deviating from connotation of the present invention, all by formation to infringement of patent right of the present invention, corresponding legal liabilities will be born.
Claims (10)
1. multi-user's anti-interference synchronous method, the frame structure used comprises targeting sequencing and data division, it is characterized in that:
Described targeting sequencing has auto-correlation or their cross correlation, makes can find synchronous point when superposition occurs the signal amplitude of described targeting sequencing,
Described targeting sequencing adopts amplitude modulation(PAM).
2. multi-user's anti-interference synchronous method as claimed in claim 1, is characterized in that:
Described targeting sequencing and described data division adopt different modulating object.
3. multi-user's anti-interference synchronous method as claimed in claim 1, is characterized in that:
Described targeting sequencing adopts the modulation system of On-off.
4. multi-user's anti-interference synchronous method as claimed in claim 1, is characterized in that:
Described targeting sequencing adopts the modulation system of PAM.
5., as the multi-user's anti-interference synchronous method in Claims 1 to 4 as described in any one, it is characterized in that:
Described data division adopts phase-modulation.
6. multi-user's anti-interference synchronization device, is characterized in that comprising targeting sequencing generation module and framing module,
Described targeting sequencing generation module receives known array and adopts amplitude modulation(PAM) mode generating leader sequence, sends to described framing module.
7. multi-user's anti-interference synchronization device as claimed in claim 6, is characterized in that:
Described targeting sequencing generation module adopts the modulation system of On-off to generate described targeting sequencing.
8. multi-user's anti-interference synchronization device as claimed in claim 6, is characterized in that:
Described targeting sequencing generation module adopts the modulation system of PAM to generate described targeting sequencing.
9., as the multi-user's anti-interference synchronization device in claim 6 ~ 8 as described in any one, characterized by further comprising data division generation module,
Described data division generation module receives information bit and adopts phase modulation method to generate data division, sends to described framing module.
10. multi-user's anti-interference synchronization device, is characterized in that comprising targeting sequencing detection module and data division detection module,
Described targeting sequencing detection module utilizes amplitude detection to obtain targeting sequencing.
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| CN108075785B (en) * | 2016-11-11 | 2020-02-21 | 博通集成电路（上海）股份有限公司 | Wireless transmitter, wireless remote receiver and transmitting method thereof |
| WO2018130017A1 (en) * | 2017-01-11 | 2018-07-19 | 中兴通讯股份有限公司 | Signal design method and system for ofdm communication, transmitter, and receiver |
| CN117938319A (en) * | 2024-03-25 | 2024-04-26 | 杭州之江创智科技有限公司 | Signal arrival detection method, system and field programmable gate array |
| CN117938319B (en) * | 2024-03-25 | 2024-06-04 | 杭州之江创智科技有限公司 | Signal arrival detection method, system and field programmable gate array |
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