CN107889124A - A kind of flood monitor data transmission method based on non-orthogonal multiple access - Google Patents

A kind of flood monitor data transmission method based on non-orthogonal multiple access Download PDF

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Publication number
CN107889124A
CN107889124A CN201711262024.4A CN201711262024A CN107889124A CN 107889124 A CN107889124 A CN 107889124A CN 201711262024 A CN201711262024 A CN 201711262024A CN 107889124 A CN107889124 A CN 107889124A
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China
Prior art keywords
monitoring point
base station
monitoring
orthogonal
access
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CN201711262024.4A
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CN107889124B (en
Inventor
程崇虎
胡洁
夏巍
陆怡琪
杨洁
熊健
桂冠
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Nanjing Post and Telecommunication University
Nanjing University of Posts and Telecommunications
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Nanjing Post and Telecommunication University
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems

Abstract

The invention discloses a kind of flood monitor data transmission method based on non-orthogonal multiple access, there are multiple water level monitoring points in same river course in water level monitoring system, the distance of each monitoring point to base station is different, packet is matched again after estimating the channel condition of monitoring point in base station, the frequency domain of multiple access access channel is divided into multiple orthogonal sub-channels, up to lack two monitoring points per sub-channels to share, use non orthogonal transmissions between them.The monitoring point distribution power that base station is given on per sub-channels according to certain power distribution algorithm, each monitoring point receiver are decoded by successive interference cancellation techniques completion message.The scheme that the present invention implements to provide neither influences water level system monitoring quality, while creatively solves the problems, such as flood time-frequency spectrum inadequate resource.

Description

A kind of flood monitor data transmission method based on non-orthogonal multiple access
Technical field
The present invention relates to flood emergency communication technical field, particularly a kind of flood based on non-orthogonal multiple access Monitoring Data transmission method.
Background technology
Due to the fast development of radio communication, the shortage of frequency spectrum resource is the bottle of data rate and service Quality advance all the time Neck, finding a kind of mobile technology that can meet Consumer's Experience demand and can raising spectrum efficiency turns into the task of top priority, this Under background, non-orthogonal multiple access technology is arisen at the historic moment.The multiple access technique bag that traditional wireless communication system model uses Time division multiple acess, CDMA, frequency division multiple access etc. are included, countershaft, code word axle, frequency axis divide the dimension of signal space to these technologies on time It is cut into orthogonal users.Non-orthogonal multiple access technology has broken the confinement of orthogonal multiple access techniques, utilizes the channel difference between user To realize with frequency, simultaneous transmission data.Non-orthogonal multiple access is in transmitting terminal by certain power distribution algorithm to user point With different capacity, interference information is actively introduced using supercomposed coding technology.
When carrying out data transmission using superimposed code, multiple users are demodulated successively using successive interference cancellation techniques in receiving terminal The signal of superposition, and interference of the demodulated signal to subsequent user is eliminated successively, therefore user's decoding of different channels condition Order is also different.Compared with orthogonal multiple access technique, although the Receiver Complexity in non-orthogonal multiple access system has It is to be hoisted but obtain higher spectrum efficiency and power system capacity.
The problem of frequency spectrum resource shortage in the prior art when flood occurs be present, when flood occurs, largely User's burst access base station takes a large amount of frequency spectrum resources, has a strong impact on flood control alarm and the monitoring data of emphasis river course monitoring station The operation such as transmission.Existing data mode uses orthogonal multiple access technique, there was only a user occupancy per sub-channels, ignores Making full use of for frequency spectrum resource, when can not ensure a large number of users burst access, under limited spectrum resources each monitoring station Can normal work.
The content of the invention
The technical problems to be solved by the invention are overcome the deficiencies in the prior art and provide and a kind of be based on non-orthogonal multiple The flood monitor data transmission method of access, greatly improves the availability of frequency spectrum.
The present invention uses following technical scheme to solve above-mentioned technical problem:
It is including following according to a kind of flood monitor data transmission method accessed based on non-orthogonal multiple proposed by the present invention Step:
Step 1: being furnished with multiple monitoring points on each river course, multiple monitoring points are spaced apart, and monitoring point is far from base station Distance is all different;Base station receives the water level monitoring data of different monitoring points collection on river course, retransmits into Back end data processing The heart;
Step 2: Back end data processing center is analyzed water level monitoring data, if water level exceedes the early warning water of setting Position threshold value, Back end data processing center send manipulation signal to base station;
Step 3: after base station receives the manipulation signal that Back end data processing center is sent, accessed using non-orthogonal multiple Technology is sent signal is manipulated to each monitoring point;Sent using non-orthogonal multiple access technology by signal is manipulated to each monitoring point Specific method is as follows:Base station is monitored a packet according to the distance of each monitoring point to base station and matched, each packet at least two The distance of monitoring point to base station in individual monitoring point and same packet is different, according to the distance of monitoring point to base station by as far as nearly institute The descending principle of the power of distribution, base station believes the manipulation signal modulation for being sent to different monitoring points into a supercomposed coding Number, send to each monitoring point;
Step 4: each monitoring point demodulates superimposed coded signal by successive interference cancellation techniques.
It is further excellent as a kind of flood monitor data transmission method based on non-orthogonal multiple access of the present invention Change scheme, it is described manipulation signal include be used for control alarm blow a whistle manipulation signal, for controlling the camera in monitoring point more Manipulation signal, the manipulation signal for setting the camera shooting duration of video in monitoring point and for setting monitoring point of angle rotation In camera coverage manipulation signal.
It is further excellent as a kind of flood monitor data transmission method based on non-orthogonal multiple access of the present invention Change scheme, superimposed coded signal x is in step 3:
Wherein, P (i) is the power that i-th of monitoring point is got, and m is the number of monitoring point;X (i) is that base station is sent to i-th The superimposed coded signal of individual monitoring point.
It is further excellent as a kind of flood monitor data transmission method based on non-orthogonal multiple access of the present invention Change scheme, the signal that i-th of monitoring point receives in step 4 are:
yi=hix+ni (2)
Wherein, hiIt is the channel coefficients between i-th of monitoring point and base station, niThe Gaussian noise received for monitoring point with Disturb sum.
It is further excellent as a kind of flood monitor data transmission method based on non-orthogonal multiple access of the present invention Change scheme, the number of monitoring point are more than 2.
The present invention compared with prior art, has following technique effect using above technical scheme:
(1) the flood data transmission method proposed by the invention based on non-orthogonal multiple access technology, Neng Gouti High spectrum utilization;
(2) differed using the distance of monitoring point to base station, by the obvious monitoring point packet pairing of channel condition difference A shared sub-channels;Compared with conventional orthogonal multicast mode, the availability of frequency spectrum is greatly improved.
Brief description of the drawings
Fig. 1 is the flood monitor data transfer flow figure based on non-orthogonal multiple access technology;
Fig. 2 is the flood monitor data transfer schematic diagram based on non-orthogonal multiple access;
Fig. 3 is the project plan comparison figure of orthogonal multiple access access and non-orthogonal multiple access;Wherein, (a) is orthogonal multiple access access Technical transmission scheme;(b) it is nonopiate multiple access technique transmission plan;
Fig. 4 is the SIC decoding process figures of two monitoring points.
Embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with the accompanying drawings and the specific embodiments The present invention will be described in detail.
The present invention carries out flood monitor data transfer according to flow shown in Fig. 1, comprises the following steps that shown:
Step 1:The each river course in city is equipped with multiple monitoring points, multiple monitoring points are spaced apart, and to base station away from From all different.After each heavy rain, the camera collection water level monitoring data of each monitoring point, base station is transmitted in back-end data processing again The heart.
Step 2:Back-end data processing center receives the water level monitoring data of base station transmission, and staff is with reference to setting Early warning watermark threshold judge whether the river course can occur flood, if water level is close to early warning watermark threshold, back-end data The manipulation signals such as processing center will send camera multi-angled shooting, camera coverage expands are to base station, if water level exceedes Early warning watermark threshold, back-end data processing center will send alarm and manipulate signal to base station.
Step 3:After base station receives the manipulation signal that back-end data processing center is sent, base station passes through different to river course Monitoring point distance is estimated, and is grouped monitoring point according to channel condition difference and is matched, ensures that the monitoring point in same packet is arrived The distance of base station is different.As illustrated in fig. 2, it is assumed that two monitoring points 1 in same river course are separated by a certain distance with monitoring point 2, monitoring Point 1 is good compared with Adjacent Channel condition apart from base station, and monitoring point 2 is poor apart from the remote channel condition in base station, and the two monitoring points are divided into one Group.Frequency spectrum resource can not be made to be fully used using (a) method in Fig. 3, to ensure each monitoring point in limited spectrum resources Under now using method shown in (b) in Fig. 3, more work(can be distributed to the monitoring point 2 of distance relatively far away from normal work Less power is distributed in rate, the monitoring point 1 nearer apart from base station on the contrary.If the superimposed coded signal that base station is sent is:
Wherein, P (i) is the power that i-th of monitoring point is got;Base Transmitter general powerWherein m is The number of monitoring point;X (i) is the superimposed coded signal that base station is sent to i-th of monitoring point.
Step 4:The signal that i-th of monitoring point receives is:
yi=hix+ni (2)
Wherein hiIt is the channel coefficients between i-th of monitoring point and base station, niThe Gaussian noise received for monitoring point receiver With disturbing sum, its power spectral density is N0,i.In the downlink of non-orthogonal multiple, serial interference elimination is in receiving terminal by monitoring Point receiver is completed, can be correct with interference of the elimination to this monitoring point, this monitoring point can after other monitoring points decode Decoding.Herein, it is more than as shown in Figure 4 due to distributing to the signal power of monitoring point 2 and distributes to the signal power of monitoring point 1, according to public affairs The signal that formula (2) monitoring point 2 receiver receives isCause For weak signal x (1) for monitoring point 2 equivalent to noise, therefore can first decode strong signal x (2), then by receiving Signal y1Subtract x (2) and obtain glitch-free x (1), therefore the interference of x (2) has just been eliminated during decoding x (1) of monitoring point 1, The can of monitoring point 1 is correctly decoded, and completes the data transfer of water level monitoring.
It is the general introduction to above-mentioned steps below:
Step 1:
1st step:Each monitoring point gathers water level monitoring data, performs the 2nd step.
2nd step:Each monitoring point sends water level monitoring data to base station.
Step 2:
3rd step:Base station is retransmited to back-end data processing center after receiving water level monitoring data, performs the 4th step.
4th step:Back-end data processing center analyzes the water level monitoring data of different monitoring points, sends manipulation signal to base Stand.
Step 3:
5th step:After base station receives manipulation signal, monitoring point is grouped and matched, carried out power distribution according to formula (1), hold 6th step.
6th step:Base station sends superimposed coded signal to each monitoring point.
Step 4:
7th step:The superimposed coded signal of the reception of monitoring point 2 is obtained according to formula (2), performs the 8th step.
8th step:The signal for issuing monitoring point 2 serially is decoded, further decoding issues the signal of monitoring point 1.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any Those familiar with the art the invention discloses technical scope in, the change or replacement that can readily occur in, all should Cover within the scope of the present invention.

Claims (5)

1. a kind of flood monitor data transmission method based on non-orthogonal multiple access, it is characterised in that comprise the following steps:
Step 1: being furnished with multiple monitoring points on each river course, multiple monitoring points are spaced apart, and distance of the monitoring point far from base station It is all different;Base station receives the water level monitoring data of different monitoring points collection on river course, retransmits to Back end data processing center;
Step 2: Back end data processing center is analyzed water level monitoring data, if water level exceedes the early warning water level threshold of setting Value, Back end data processing center send manipulation signal to base station;
Step 3: after base station receives the manipulation signal that Back end data processing center is sent, using non-orthogonal multiple access technology Manipulation signal is sent to each monitoring point;Using non-orthogonal multiple access technology will manipulate signal send it is specific to each monitoring point Method is as follows:Base station is monitored a packet according to the distance of each monitoring point to base station and matched, each at least two prisons of packet The distance of monitoring point to base station in measuring point and same packet is different, according to the distance of monitoring point to base station by being distributed as far as near The descending principle of power, base station will be sent to the manipulation signal modulations of different monitoring points into a superimposed coded signal, Send to each monitoring point;
Step 4: each monitoring point demodulates superimposed coded signal by successive interference cancellation techniques.
2. a kind of flood monitor data transmission method based on non-orthogonal multiple access according to claim 1, its feature Be, it is described manipulation signal include be used for control alarm blow a whistle manipulation signal, for controlling the camera in monitoring point polygonal Spend the manipulation signal rotated, the manipulation signal for setting the camera shooting duration of video in monitoring point and for setting in monitoring point Camera coverage manipulation signal.
3. a kind of flood monitor data transmission method based on non-orthogonal multiple access according to claim 1, its feature It is, superimposed coded signal x is in step 3:
<mrow> <mi>x</mi> <mo>=</mo> <msubsup> <mi>&amp;Sigma;</mi> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>m</mi> </msubsup> <msqrt> <mrow> <mi>P</mi> <mrow> <mo>(</mo> <mi>i</mi> <mo>)</mo> </mrow> </mrow> </msqrt> <mi>x</mi> <mrow> <mo>(</mo> <mi>i</mi> <mo>)</mo> </mrow> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>
Wherein, P (i) is the power that i-th of monitoring point is got, and m is the number of monitoring point;X (i) is that base station is sent to i-th of prison The superimposed coded signal of measuring point.
4. a kind of flood monitor data transmission method based on non-orthogonal multiple access according to claim 3, its feature It is, the signal that i-th of monitoring point receives in step 4 is:
yi=hix+ni (2)
Wherein, hiIt is the channel coefficients between i-th of monitoring point and base station, niThe Gaussian noise received for monitoring point and interference Sum.
5. a kind of flood monitor data transmission method based on non-orthogonal multiple access according to claim 1, its feature It is, the number of monitoring point is more than 2.
CN201711262024.4A 2017-12-04 2017-12-04 Flood monitoring data transmission method based on non-orthogonal multiple access Active CN107889124B (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN108770004A (en) * 2018-05-18 2018-11-06 浙江工业大学 A kind of nonopiate access downlink times optimization method based on dichotomous search formula

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CN206505540U (en) * 2017-02-08 2017-09-19 成都英孚克斯科技有限公司 A kind of wireless alarming terminating machine of registering one's residence based on the wireless cooperation communication technology
CN107195164A (en) * 2017-07-03 2017-09-22 长江水利委员会长江科学院 Mountain flood on-line monitoring identification method for early warning and its early warning system

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Publication number Priority date Publication date Assignee Title
CN202382814U (en) * 2011-11-07 2012-08-15 南京易周能源科技有限公司 Water level monitoring and early warning system
CN105991219A (en) * 2015-01-30 2016-10-05 中兴通讯股份有限公司 Sending signal processing method and device
WO2017083008A1 (en) * 2015-11-13 2017-05-18 Qualcomm Incorporated Channel station information reporting and transmission mode for enhanced machine type communication
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CN107195164A (en) * 2017-07-03 2017-09-22 长江水利委员会长江科学院 Mountain flood on-line monitoring identification method for early warning and its early warning system

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Publication number Priority date Publication date Assignee Title
CN108770004A (en) * 2018-05-18 2018-11-06 浙江工业大学 A kind of nonopiate access downlink times optimization method based on dichotomous search formula
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