CN101188489A - Method for multi-user transmission in ultra-short wave OFDM mobile multimedia sensor network TDMA - Google Patents
Method for multi-user transmission in ultra-short wave OFDM mobile multimedia sensor network TDMA Download PDFInfo
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- CN101188489A CN101188489A CNA2007100375394A CN200710037539A CN101188489A CN 101188489 A CN101188489 A CN 101188489A CN A2007100375394 A CNA2007100375394 A CN A2007100375394A CN 200710037539 A CN200710037539 A CN 200710037539A CN 101188489 A CN101188489 A CN 101188489A
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Abstract
The invention relates to an ultrashort wave OFDM mobile multimedia sensor network TDMA multi-user transmission method. A transmission system has a working frequency of 300-400MHz. The channel width is 8MHz; N base stations and M user ends are arranged; each base station is connected with a control center by using optical fiber; and time accounting is done by GPS. A frame structure, which is positioned in every base station wireless channel time domain and which repeats regularly, is divided into M+1 time slots; the 1 to M time slots correspond to the 1 to M user ends and uploads the data to the base station; the data from N base stations in M+1 time slots are downloaded to the M user ends at the same time. The transmission rate of uplink data of the user end to the base station is greater than 750kbps/channel; and the transmission rate of downlink data to the user end is greater than 30kbps/user. With the scheme, the invention has the advantages that transmission effect is good, and has the ability of real-time transmission of multi-channel images and diffraction capability under urban environment.
Description
Technical field
The present invention relates to the method for a kind of ultrashort wave OFDM (OFDM) mobile multimedia sensor network time division multiple access (TDMA) multi-user transmission.
Background technology
Ultrashort wave mobile multimedia sensor network TDMA multi-user transmission system based on orthogonal frequency division multiplexi (OFDM) is to scout the actual demand of medium-long range network according to the battlefield sensing, use with moving image transmitting is defeated in conjunction with alert, according to the brand-new wireless high-definition number of degrees word image web-transporting device of customer requirements exploitation.It meets the wireless image transmission requirements fully, is the powerful Vehicular video transmission equipment with certain diffracting power.This system is widely used in battle reconnaissance, public security Emergency Command Vehicle, the monitoring of important official fleet, fire-fighting People's Armed Police floor manager car and other urgent emergency commading system, it mainly acts on is that realtime graphic with the scene is passed command centre back, make the commanding and decision-making personnel of command centre such as on the spot in person, improve the accuracy and the promptness of decision-making.Use after this system, main commanding can go to the scene in person, improves commander's operating efficiency of main head greatly.
The core technology of this system is that the ultrashort wave Linear Double of 300MHz～400MHz is to communication system.Because this system has adopted time division multiple access (TDMA) technology, so have the characteristics of multichannel simultaneous interpretation.Owing to adopted the ultrashort wave frequency range, the equipment that makes has certain diffracting power, in several kilometers the distance, even stopping of building arranged, also can pass through diffraction in the city, and image is transferred back to command centre simultaneously.So,, set up several base stations according to the zone as long as in the city, the command car of this equipment is housed, make and at any time information such as image, voice and data to be transferred back to command centre, also can pass to command car under the instruction with command centre, realize real two-way mobile broadband communication.
The unobstructed transmission range of this system is 30 kilometers.There is the transmission range under the situation of stopping to decide, has housing-group to stop that the transmission range of test is 3.5 kilometers in the actual city on the situation of blocking.
Command centre's reception antenna antenna height of this system height of should trying one's best preferably is erected on the commanding elevation in city, so that avoid to greatest extent stopping, reduces base station number, improves transmission range, reduces the cost of whole system.
At present, in the world only based on the image delivering system of China mobile multi-media broadcasting technology.China has proposed 5 cover ground digital television broadcast transmission plans: " the radio frequency subband is cut apart two carrier wave hybrid modulation systems " of broadcasting research institute of (1) General Bureau of Radio, Film and Television (CDTB-T); (2) the advanced digital television broadcasting system (ADTB-T) of national HDTV Overall Group, it adopts offset quadrature amplitude modulation(PAM) (OQAM modulation), is the single-carrier system of mixed transmission modes; (3) the BDB-T system of national HDTV Overall Group, it is based on multi-carrier modulation technology; (4) " synchronous multicarrier spread spectrum surface digital TV transmission system " of University of Electronic Science and Technology (SMCC/COFDM); (5) Tsing-Hua University's microwave and digital communication National Key Laboratory " ground digital multimedia and the television broadcasting system " that propose (DMB-T), it adopts time-domain synchronization OFDM technology (TDS-OFDM).
The intermediate range of domestic use moves the high speed image transmission system and mainly contains two classes: a class is based on the unidirectional image delivering system of point-to-point COFDM of DVB-T (Coded Orthogonal Frequency Division Multiplexing (COFDM) COFDM modulation), does not possess two-way networking function; Another kind of is line-of-sight transmission TDMA multiway images transmission system and Wireless MESH image delivering system, does not possess diffracting power.Also have image transmission system, promptly change, but image effect is not good with the WLAN bridge based on direct sequence spread spectrum (DSSS).The mobile multimedia sensor network that does not have diffracting power and two-way networking can't satisfy the application demand of above-mentioned important events, must carry out original innovation, and its transmission system is the key of design, is the forward position research field that current multidisciplinary height intersects.
Summary of the invention
The objective of the invention is for a kind of method of ultra-short wave OFDM mobile multimedia sensor network TDMA multi-user transmission is provided, it is not good to have solved existing mobile multimedia sensor network laser propagation effect, and do not possess that multiway images transmits simultaneously and urban environment under the problem of diffracting power difference.
For achieving the above object, the present invention has adopted following technical scheme:
The invention discloses a kind of method of ultra-short wave OFDM mobile multimedia sensor network TDMA multi-user transmission, comprise that transmission system is provided with N base station and M user side, it is characterized in that: a recurrent frame structure in each base station radio channel time domain is divided into M+1 time slot, the 1st～M time slot respectively one by one respective user end 1～M upload data to the base station, M+1 time slot N base station is successively to M user side down-transmitting data simultaneously.
Each base station of described TDMA multiuser transmission method is connected with the charge center by special optic fibre, system when being undertaken by GPS.
The multiimage that upload each base station according to picture quality at the charge center of described TDMA multiuser transmission method is selected.
The down-transmitting data of described TDMA multiuser transmission method adopts the OFDM multiuser mode.
The downlink data of described TDMA multiuser transmission method comprises temporal information, control signaling, data, wherein, in the frame period is worked in N base station, control signaling, the data of the same content of following biography.
Operating frequency 300～the 400MHz of described TDMA multiuser transmission method, channel width 8MHz.
Preferably, described transmission system is provided with nine base stations and four user sides.User side to the higher uplink bit rate of base station greater than the 750kbps/ road, the base station to the downlink transmission data rate of user side greater than 30kbps/ user.
Because adopted above scheme, the beneficial effect that the present invention is possessed is: laser propagation effect is good, and possesses multiway images and transmit simultaneously, and have a suitable diffracting power under the urban environment.
Description of drawings
Fig. 1 is the topological diagram of network transmission system of the present invention.
Fig. 2 is a network transmission system TDMA multi-user working method schematic diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described.
A kind of method of ultra-short wave OFDM mobile multimedia sensor network TDMA multi-user transmission, transmission system is provided with 9 base stations and 4 user sides, and each base station is connected with the charge center by special optic fibre, system when being undertaken by the pulse per second (PPS) of GPS.A recurrent frame structure in each base station radio channel time domain is divided into 5 time slots, the 1st～4 time slot respectively one by one respective user end 1～4 upload data to the base station, the base station is to 4 user sides while down-transmitting datas in the 5th time slot, downlink data comprises temporal information, control signaling and data, 9 base stations successively at the 5th time slot to 4 user side down-transmitting datas, the content that amounts to the control signaling that passes down in 45 time slots and data is identical.Greater than the 750kbps/ road, greater than 30kbps/ user, overall data transmission rate is greater than 750kbps * 4+30kbps * 4=3120kbps to descending (DL) of user side message transmission rate in the base station to up (UL) of base station message transmission rate for user side.The operating frequency of system is 300～400MHz, and channel width is 8MHz.The multiimage that upload each base station according to picture quality at the charge center is selected.
Claims (7)
1. the method for ultra-short wave OFDM mobile multimedia sensor network TDMA multi-user transmission, comprise that transmission system is provided with N base station and M user side, each base station is connected with the charge center by optical fiber, system when being undertaken by GPS, it is characterized in that: a recurrent frame structure in each base station radio channel time domain is divided into M+1 time slot, the 1st～M time slot respectively one by one respective user end 1～M upload data to the base station, M+1 time slot N base station is successively to M user side down-transmitting data simultaneously.
2. the method for ultra-short wave OFDM mobile multimedia sensor network TDMA multi-user transmission according to claim 1, it is characterized in that: the multiimage that upload each base station according to picture quality at the charge center is selected.
3. the method for ultra-short wave OFDM mobile multimedia sensor network TDMA multi-user transmission according to claim 1 is characterized in that: down-transmitting data adopts the OFDM multiuser mode.
4. the method for ultra-short wave OFDM mobile multimedia sensor network TDMA multi-user transmission according to claim 1, it is characterized in that: downlink data comprises temporal information, control signaling, data, wherein, in the frame period is worked in N base station, control signaling, the data of the same content of following biography.
5. the method for ultra-short wave OFDM mobile multimedia sensor network TDMA multi-user transmission according to claim 1, it is characterized in that: described transmission system is provided with nine base stations and four user sides.
6. the method for ultra-short wave OFDM mobile multimedia sensor network TDMA multi-user transmission according to claim 1, it is characterized in that: operating frequency is 300～400MHz, channel width is 8MHz.
7. the method for ultra-short wave OFDM mobile multimedia sensor network TDMA multi-user transmission according to claim 1, it is characterized in that: user side to the higher uplink bit rate of base station greater than the 750kbps/ road, the base station to the downlink transmission data rate of user side greater than 30kbps/ user.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200710037539A CN100589369C (en) | 2007-02-13 | 2007-02-13 | Method for multi-user transmission in ultra-short wave OFDM mobile multimedia sensor network TDMA |
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| CN200710037539A CN100589369C (en) | 2007-02-13 | 2007-02-13 | Method for multi-user transmission in ultra-short wave OFDM mobile multimedia sensor network TDMA |
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| CN101188489A true CN101188489A (en) | 2008-05-28 |
| CN100589369C CN100589369C (en) | 2010-02-10 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102438335A (en) * | 2011-12-08 | 2012-05-02 | 中国科学院上海微系统与信息技术研究所 | Medium-long range wireless sensor network networking system |
| CN103701746A (en) * | 2013-11-21 | 2014-04-02 | 郑州三和视讯技术有限公司 | Time-division two-way narrow-band common-frequency multi-service wireless transmission method |
| CN109348484A (en) * | 2018-11-28 | 2019-02-15 | 中国人民解放军陆军工程大学 | A kind of multi-user's short wave communication network model and channel detection method |
| CN110557237A (en) * | 2015-11-25 | 2019-12-10 | 上海朗帛通信技术有限公司 | Wireless communication method and device for reducing network delay |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6895219B2 (en) * | 2001-08-27 | 2005-05-17 | Symbol Technologies Inc. | Dual use of FFT circuity in imagers and transceivers |
| CN100366019C (en) * | 2006-03-07 | 2008-01-30 | 南京澳帝姆科技有限公司 | Communication method between wireless sensor network node and gateway |
-
2007
- 2007-02-13 CN CN200710037539A patent/CN100589369C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102438335A (en) * | 2011-12-08 | 2012-05-02 | 中国科学院上海微系统与信息技术研究所 | Medium-long range wireless sensor network networking system |
| CN102438335B (en) * | 2011-12-08 | 2014-01-29 | 中国科学院上海微系统与信息技术研究所 | Medium-long range wireless sensor network networking system |
| CN103701746A (en) * | 2013-11-21 | 2014-04-02 | 郑州三和视讯技术有限公司 | Time-division two-way narrow-band common-frequency multi-service wireless transmission method |
| CN110557237A (en) * | 2015-11-25 | 2019-12-10 | 上海朗帛通信技术有限公司 | Wireless communication method and device for reducing network delay |
| CN109348484A (en) * | 2018-11-28 | 2019-02-15 | 中国人民解放军陆军工程大学 | A kind of multi-user's short wave communication network model and channel detection method |
| CN109348484B (en) * | 2018-11-28 | 2022-02-18 | 中国人民解放军陆军工程大学 | Multi-user short-wave communication network model and channel detection method |
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| CN100589369C (en) | 2010-02-10 |
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