CN107889124B - Flood monitoring data transmission method based on non-orthogonal multiple access - Google Patents
Flood monitoring data transmission method based on non-orthogonal multiple access Download PDFInfo
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- CN107889124B CN107889124B CN201711262024.4A CN201711262024A CN107889124B CN 107889124 B CN107889124 B CN 107889124B CN 201711262024 A CN201711262024 A CN 201711262024A CN 107889124 B CN107889124 B CN 107889124B
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Abstract
The invention discloses a flood monitoring data transmission method based on non-orthogonal multiple access, wherein a plurality of water level monitoring points are arranged in the same river channel in a water level monitoring system, the distance from each monitoring point to a base station is different, the base station estimates the channel conditions of the monitoring points and then performs pairing grouping, the frequency domain of a multiple access channel is divided into a plurality of orthogonal sub-channels, at least two monitoring points on each sub-channel are shared, and non-orthogonal transmission is adopted between the monitoring points. The base station distributes power to the monitoring points on each sub-channel according to a certain power distribution algorithm, and the receiver of each monitoring point completes message decoding through a serial interference elimination technology. The scheme provided by the implementation of the invention does not influence the monitoring quality of the water level system, and simultaneously creatively solves the problem of insufficient spectrum resources in flooding.
Description
Technical Field
The invention relates to the technical field of flood disaster emergency communication, in particular to a flood monitoring data transmission method based on non-orthogonal multiple access.
Background
Due to the rapid development of wireless communication, the shortage of spectrum resources is always the bottleneck of improving data rate and service quality, and it is urgent to find a mobile technology that can meet the user experience demand and improve spectrum efficiency. The multiple access techniques adopted by the conventional wireless communication system model include time division multiple access, code division multiple access, frequency division multiple access, etc., and these techniques divide the dimension of the signal space into orthogonal users according to the time axis, the code word axis, and the frequency axis. The non-orthogonal multiple access technology breaks through the limitation of the orthogonal multiple access technology, and realizes the same frequency and simultaneous data transmission by utilizing the channel difference among users. The non-orthogonal multiple access distributes different powers to users through a certain power distribution algorithm at a transmitting end, and actively introduces interference information by adopting a superposition coding technology.
When the superposition code is adopted for data transmission, the superposed signals of a plurality of users are demodulated in sequence by adopting a serial interference elimination technology at a receiving end, and the interference of the demodulated signals to subsequent users is eliminated in sequence, so the decoding sequences of the users with different channel conditions are different. Compared with the orthogonal multiple access technology, the receiver complexity in the non-orthogonal multiple access system is to be improved, but higher spectrum efficiency and system capacity are obtained.
When a flood disaster occurs, a large number of users suddenly access to the base station to occupy a large number of frequency spectrum resources, and operations such as flood prevention alarm and monitoring data transmission of key river channel monitoring stations are seriously affected. The existing data mode adopts an orthogonal multiple access technology, each sub-channel is occupied by only one user, the full utilization of frequency spectrum resources is neglected, and each monitoring station can normally work under the limited frequency spectrum resources when a large number of users are accessed in a burst mode.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a flood monitoring data transmission method based on non-orthogonal multiple access, thereby greatly improving the frequency spectrum utilization rate.
The invention adopts the following technical scheme for solving the technical problems:
the invention provides a flooding monitoring data transmission method based on non-orthogonal multiple access, which comprises the following steps:
step one, a plurality of monitoring points are arranged on each river channel and distributed at intervals, and the distances from the monitoring points to a base station are different; the base station receives water level monitoring data collected by different monitoring points on the river channel and then sends the water level monitoring data to the rear-end data processing center;
step two, the back-end data processing center analyzes the water level monitoring data, and if the water level exceeds a set early warning water level threshold, the back-end data processing center sends a control signal to the base station;
thirdly, after receiving the control signal sent by the back-end data processing center, the base station sends the control signal to each monitoring point by adopting a non-orthogonal multiple access technology; the specific method for sending the control signal to each monitoring point by adopting the non-orthogonal multiple access technology is as follows: the base station carries out monitoring point grouping pairing according to the distance from each monitoring point to the base station, each group is provided with at least two monitoring points, the distances from the monitoring points in the same group to the base station are different, and according to the principle that the power distributed from the distance from the monitoring points to the base station is from large to small, the base station modulates the control signals sent to different monitoring points into a superposition coding signal and sends the superposition coding signal to each monitoring point;
and step four, demodulating the superposed coded signals by each monitoring point through a serial interference elimination technology.
The flood monitoring data transmission method based on the non-orthogonal multiple access further optimizes the scheme, wherein the control signals comprise control signals for controlling alarm whistle, control signals for controlling multi-angle rotation of a camera in a monitoring point, control signals for setting the shooting duration of the camera in the monitoring point and control signals for setting the shooting range of the camera in the monitoring point.
As a further optimization scheme of the flood monitoring data transmission method based on the non-orthogonal multiple access, the superposition coded signal x in the third step is as follows:
wherein, P (i) is the power divided by the ith monitoring point, and m is the number of the monitoring points; x (i) is the superposition coded signal sent by the base station to the ith monitoring point.
As a further optimization scheme of the flood monitoring data transmission method based on the non-orthogonal multiple access, the signal received by the ith monitoring point in the fourth step is as follows:
yi＝hix+ni(2)
wherein h isiIs the channel coefficient between the ith monitoring point and the base station, niIs the sum of the Gaussian noise and the interference received by the monitoring point.
As a further optimization scheme of the flood monitoring data transmission method based on the non-orthogonal multiple access, the number of monitoring points is more than 2.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
(1) the flood disaster data transmission method based on the non-orthogonal multiple access technology can improve the frequency spectrum utilization rate;
(2) grouping and pairing the monitoring points with obvious channel condition difference to share a sub-channel by utilizing the different distances from the monitoring points to the base station; compared with the traditional orthogonal multiple access transmission mode, the method greatly improves the frequency spectrum utilization rate.
Drawings
Fig. 1 is a flow chart of flood monitoring data transmission based on non-orthogonal multiple access technology;
FIG. 2 is a schematic diagram of flood monitoring data transmission based on non-orthogonal multiple access;
fig. 3 is a diagram comparing schemes of orthogonal multiple access and non-orthogonal multiple access; wherein, (a) is an orthogonal multiple access technology transmission scheme; (b) a non-orthogonal multiple access technology transmission scheme;
fig. 4 is a diagram of SIC decoding process for two monitoring points.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The flood monitoring data transmission is carried out according to the flow shown in fig. 1, and the specific steps are as follows:
the method comprises the following steps: every river course in city all is furnished with a plurality of monitoring points, a plurality of monitoring point interval distribution, and all different to the distance of basic station. After each rainstorm, the cameras of the monitoring points acquire water level monitoring data, and the base station transmits the water level monitoring data to the background data processing center.
Step two: the background data processing center receives water level monitoring data sent by the base station, a worker judges whether flood disasters happen to the river channel according to a set early warning water level threshold, if the water level is close to the early warning water level threshold, the background data processing center sends control signals such as camera multi-angle shooting and camera shooting range expansion to the base station, and if the water level exceeds the early warning water level threshold, the background data processing center sends alarm control signals to the base station.
Step three: after the base station receives the control signal sent by the background data processing center, the base station pre-estimates the distances between different monitoring points of the river channel, and groups and pairs the monitoring points according to the channel condition difference, so that the distances from the monitoring points in the same group to the base station are different. As shown in fig. 2, two monitoring points 1 and 2 in the same river are assumed to have a certain distance, the channel condition of the monitoring point 1 close to the base station is good, and the channel condition of the monitoring point 2 far from the base station is poor, so that the two monitoring points are divided into a group. The method (a) in fig. 3 cannot make full use of spectrum resources, and to ensure that each monitoring point can normally work under limited spectrum resources, the method (b) in fig. 3 is adopted to allocate more power to the monitoring point 2 relatively far away, and conversely allocate less power to the monitoring point 1 closer to the base station. The superposition coded signal sent by the base station is:
wherein P (i) is the power divided by the ith monitoring point; total power of base station transmission
Wherein m is the number of monitoring points; x (i) is the superposition coded signal sent by the base station to the ith monitoring point.
Step four: the signal received by the ith monitoring point is as follows:
yi＝hix+ni(2)
wherein h isiBetween the ith monitoring point and the base stationOf the channel coefficient niThe power spectrum density of the sum of Gaussian noise and interference received by a receiver of the monitoring point is N0,i. In the downlink of non-orthogonal multiple access, the serial interference elimination is completed by the monitoring point receiver at the receiving end, when other monitoring points decode, the interference to the monitoring point can be eliminated, and the monitoring point can decode correctly. Here, since the signal power allocated to monitoring point 2 is greater than the signal power allocated to monitoring point 1 as shown in fig. 4, the receiver of monitoring point 2 receives a signal of
Since the weak signal x (1) is equivalent to noise for the monitoring point 2, the strong signal x (2) can be decoded first and then the received signal y can be used1Subtracting x (2) to obtain non-interference x (1), so that when the monitoring point 1 decodes x (1), the interference of x (2) is removed, the monitoring point 1 can decode correctly, and the data transmission of water level monitoring is completed.
The following is a summary of the above steps:
the method comprises the following steps:
step 1: and (5) collecting water level monitoring data by each monitoring point and executing the step 2.
Step 2: and each monitoring point sends the water level monitoring data to the base station.
Step two:
and 3, the base station receives the water level monitoring data and then sends the water level monitoring data to the background data processing center, and the step 4 is executed.
And 4, analyzing the water level monitoring data of different monitoring points by the background data processing center, and sending an operation signal to the base station.
Step three:
and 5, step 5: and after receiving the control signal, the base station groups and pairs the monitoring points, performs power distribution according to the formula (1), and executes the step 6.
And 6, step 6: and the base station sends the superposition coding signal to each monitoring point.
Step four:
and 7, step 7: and (4) calculating the superposition coding signal received by the monitoring point 2 according to the formula (2), and executing the step 8.
And 8, step 8: the signals sent to the monitoring point 2 are decoded in series, and then the signals sent to the monitoring point 1 are decoded.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (5)
1. A flood monitoring data transmission method based on non-orthogonal multiple access is characterized by comprising the following steps:
step one, a plurality of monitoring points are arranged on each river channel and distributed at intervals, and the distances from the monitoring points to a base station are different; the base station receives water level monitoring data collected by different monitoring points on the river channel and then sends the water level monitoring data to the rear-end data processing center;
step two, the back-end data processing center analyzes the water level monitoring data, and if the water level exceeds a set early warning water level threshold, the back-end data processing center sends a control signal to the base station;
thirdly, after receiving the control signal sent by the back-end data processing center, the base station sends the control signal to each monitoring point by adopting a non-orthogonal multiple access technology; the specific method for sending the control signal to each monitoring point by adopting the non-orthogonal multiple access technology is as follows: the base station carries out monitoring point grouping and pairing according to the distance from each monitoring point to the base station, each group is provided with at least two monitoring points, the distances from the monitoring points in the same group to the base station are different, and according to the principle that the distance from the monitoring points in the group to the base station is from far to near, the distributed power is from large to small, the base station modulates the control signals sent to different monitoring points in the group into a superposition coding signal and sends the superposition coding signal to each monitoring point in the group;
and step four, demodulating the superposed coded signals by each monitoring point through a serial interference elimination technology.
2. The flood monitoring data transmission method based on the non-orthogonal multiple access, according to claim 1, wherein the control signals comprise a control signal for controlling alarm whistle, a control signal for controlling multi-angle rotation of a camera in a monitoring point, a control signal for setting shooting duration of the camera in the monitoring point, and a control signal for setting shooting range of the camera in the monitoring point.
3. The method for flood monitoring data transmission according to claim 1, wherein the code signal x is superimposed in three steps:
wherein, P (i) is the power divided by the ith monitoring point, and m is the number of the monitoring points; x (i) is the superposition coded signal sent by the base station to the ith monitoring point.
4. The method for flood monitoring data transmission according to claim 3, wherein the signal received by the ith monitoring point in the fourth step is:
yi＝hix+ni(2)
wherein h isiIs the channel coefficient between the ith monitoring point and the base station, niIs the sum of the Gaussian noise and the interference received by the monitoring point.
5. The method for flood monitoring data transmission according to claim 1, wherein the number of monitoring points is greater than 2.
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