CN101582709A - Transmission method for wireless multipoint receiving and system - Google Patents
Transmission method for wireless multipoint receiving and system Download PDFInfo
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- CN101582709A CN101582709A CNA2009101483785A CN200910148378A CN101582709A CN 101582709 A CN101582709 A CN 101582709A CN A2009101483785 A CNA2009101483785 A CN A2009101483785A CN 200910148378 A CN200910148378 A CN 200910148378A CN 101582709 A CN101582709 A CN 101582709A
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Abstract
The invention discloses a transmission method for wireless multipoint receiving, which forwards data between a source node and a target node by multiple receiving nodes commonly. The source node makes service flow information to be forwarded into data packets, packet identification is inserted and then data packets are sent after being coded and modulated by a channel; a plurality of receiving nodes carry out channel demodulation and decoding to a receiving signal to obtain data packets and forward data packets without errors to the target node; the target node receives the data packets forwarded by a plurality of receiving nodes, data packet identification are utilized to process data packets and the service flow information forwarded is restored. The invention also discloses a transmission system for wireless multipoint receiving. The provided transmission method and the system realize the large-area mobile receiving of wireless data under the condition of no need of acquiring channel quality of the receiving points and simultaneously guarantee the distortionless restoration of transmitted data in the whole coverage range.
Description
Technical field
The invention belongs to the wireless digital content transmission technique field, transmission method and transmission system that particularly wireless mobile multimedia data multiple spot receives.
Background technology
Along with the progressively raising of people to wireless communication needs, the demand of wireless bandwidth is become increasing, (Broadband Wireless Access, BWA) technology becomes one of focus of present development communication technologies just gradually in broadband wireless access.The data bit rate of transmission and spectrum efficiency require high, and high-speed mobile receives the characteristic of channel of bringing and becomes when quick, and building is contour, and to build the long delay multipath interference of building etc. in large scale all be unusual acid test for broadband system.In order under such propagation conditions, to keep the acceptable transmission quality, above adverse effect is offset in the various channel-bank technology measures of general employing, mainly comprises chnnel coding, digital modulation, multi-antenna diversity, spread spectrum/frequency hopping, channel estimating and equilibrium etc.Adopt these technology to reduce threshold level to a certain extent, improved the validity and the reliability of system.Stop the influence of serious and the objective condition such as position that fix up an aerial wire then owing to transmitting power, city building, making always has some regional wireless signal strength very low, still can't normally receive, be difficult to use the single-point wireless transmission to realize covering so on a large scale, thereby cause the wireless device scope of application limited.
Can't realize covering problem on a large scale in order to solve the single-point reception, method commonly used at present is to use single-point emission, multiple spot receiving system.Receive in the network system at existing multiple spot, a kind of method is to adopt changing method manually: a plurality of acceptance points are transmitted the data that receive by analog signal, and destination node will carry out manual switching by the simulation switching matrix from the multichannel analog signals of different acceptance points and come selective reception.Another kind method is the channel quality information that destination node gets access to each acceptance point, adjudicates automatically transmitting the digital signal of coming according to channel quality, switches to the best transmission channel and receives, the drawback of having avoided analog machine to switch manually.But above multiple spot method of reseptance all can cause the rigid switching to different acceptance point signals, because that the data of each acceptance point can't be carried out again is synchronous, so always bring error in data when switching, network service quality is descended greatly.Especially little in transmitting power, single-point area coverage hour, channel switches incidence than higher, and mistake can often appear in data.
Summary of the invention
In view of this, main purpose of the present invention provides the transmission method that a kind of wireless multipoint receives, this method does not need to obtain the channel quality of each acceptance point, and processing data packets is effectively eliminated the error in data that the channel switching brings, and has improved network service quality greatly.Another inventive point of the present invention is for being applied to packet in " multiple spot receives transmission " technology, with the packet is that the unit carries out data transmission, reception, quality judgement, combination recovery, wherein be that the unit carries out the quality judgement, improved the accuracy that the quality of data is judged to a great extent with the packet; The use of package identification has also improved the accuracy of data recovery reorganization greatly in addition, has guaranteed finally to obtain the quality of data.
It is a principal object of the present invention to be achieved by the following technical solutions:
The transmission method that a kind of wireless multipoint receives, in this method, the data between source node and the destination node are transmitted jointly by a plurality of receiving nodes, and this method comprises the steps:
A, source node break into packet with Business Stream information to be sent, and insert the bag sign, will send after packet channel coding and the modulation then;
B, a plurality of receiving node send to source node that signal carries out channel demodulation and decoding obtains packet, and will not have error data packets to transmit to destination node;
C, destination node receive the packet of transmitting from a plurality of receiving nodes, utilize package identification to carry out processing data packets, recover the Business Stream information that passes again.
Wherein, the bag of packet described in steps A sign is used to distinguish packet; Preferably, use the bag sign of bag counting as packet.
Wherein, the described chnnel coding of steps A can adopt convolution code, Turbo code and loe-density parity-check code, preferably, uses loe-density parity-check code.
Wherein, in the steps A packet through LDPC coding and OFDM multi-carrier modulation after, be transformed into I and Q two-way digital orthogonal baseband signal through D/A, then use the low local oscillator of making an uproar mutually to carry out orthogonal radio frequency and modulate, the rf modulated signal that obtains is sent to antenna and launches after filtering, amplifying.
Wherein, packet is 188 bytes.
Wherein, a plurality of receiving nodes among the step B are wanted reasonable disposition, and each zone in the requirement coverage will have at least a receiving node can realize the correct reception that source node transmits.
Wherein, step B determines by the channel-decoding result whether the packet that receives exists mistake, and will exist error data packets not transmit.
Wherein, low noise amplifier, channel model, mixing that the radiofrequency signal of receiving from antenna among the step B is delivered to receiver through feeder line become I and Q two-way digital orthogonal baseband signal to export to the OFDM demodulating unit, the OFDM demodulating unit is finished Clock Extraction, channel estimating and equilibrium, balanced back data are carried out LDPC decoding and are recovered 188 byte data bags, whether forwarding module comes the judgment data bag wrong according to the decoded result of LDPC, and faultless packet is packaged into UDP bag according to the UDP procotol, send by the form of Ethernet interface then with the UDP bag.
Wherein, the described processing data packets of step C comprises at least and abandons the packet that repeats to receive and rearrangement packet.
Wherein, by hub the UDP bag that the multichannel Ethernet sends is sent into PC among the step C, PC extracts 188 byte data bags of forwarding from the UDP bag, PC software is by the Treatment Analysis to the bag sign, with the multiple connection of resequencing of all packets of receiving, remove and repeat the Data transmission bag, recover one road complete real time data.
Wherein, when transmitting, adopts described receiving node cable network, such as Ethernet or optical fiber etc.When transmitting, described receiving node also can adopt wireless network, such as digital microwave or WLAN (wireless local area network).
Wherein, described source node is small-power back pack transmitter (2-5 a watt), is preferably 2 watts.Described source node also can be preferably 20 watts for high power vehicular formula transmitter (18-25 watt).
The transmission system that a kind of wireless multipoint receives, this system comprises: source node, a plurality of receiving node and destination node, wherein:
Source node is used for information to be sent being broken into packet and inserting the bag sign, will send after packet channel coding and the modulation then;
A plurality of receiving nodes are used for source node sent that signal carries out channel demodulation and decoding obtains packet, and will not have error data packets to transmit to destination node;
Destination node receives the packet of transmitting from a plurality of receiving nodes, utilizes package identification to carry out processing data packets, recovers the Business Stream information that passes again.
Wherein, described source node comprises: information package module, chnnel coding and modulation module, radio frequency sending module and antenna.The information package module receives information to be sent, and transmission information is broken into packet, and inserts the bag sign; Chnnel coding and modulating baseband module, the packet that is used for generating carries out chnnel coding and modulation conversion is a baseband signal; Radio frequency sending module and antenna are used for baseband signal is converted to radiofrequency signal, send after the amplification.
Wherein, described receiving node comprises: antenna and Receiver Module, baseband channel demodulation sign indicating number module, forwarding module.Antenna and Receiver Module are used for received RF signal, and convert baseband signal to; Channel demodulation and decoder module, be used for to baseband signal carry out channel synchronization, channel estimating and equilibrium, channel-decoding recovers packet; Forwarding module is used for transmitting to destination node there not being error data packets.
Wherein, when transmitting, described receiving node can adopt cable network, as Ethernet, optical fiber etc.; Also can adopt wireless network, as digital microwave, WLAN (wireless local area network) etc.
The beneficial effect of method and system provided by the present invention is: the transmission method that wireless multipoint proposed by the invention receives, can in mobile environment, expand the coverage area, and guarantee to transmit in the whole coverage the undistorted recovery of data simultaneously.In addition, the present invention is applied to the UDP message bag in the multiple spot reception technique, UDP message packet network penetration capacity is strong, can carry out network service in the occasion of network environment relative complex, it is little that it has a resource consumption, the advantage that processing speed is fast, but it contains the situation that is prone to data-bag lost with respect to tcp data, applying it to multiple spot receives in the transmission technology, because acceptance point is more, overcome the problem that its packet is easily lost to a great extent, can be good at bringing into play its advantage that network penetration power is strong, processing speed is fast simultaneously.
Description of drawings
Multiple spot receiving system transmission method concerns schematic diagram among Fig. 1 the present invention
The flow chart of multiple spot receiving system transmission method among Fig. 2 the present invention
The structural representation of source node in Fig. 3 embodiment of the invention
The structural representation of receiving node in Fig. 4 embodiment of the invention
Embodiment 1 schematic diagram that Fig. 5 the present invention adopts Ethernet to transmit
Embodiment 2 schematic diagrames that Fig. 6 the present invention adopts optical fiber to transmit
Embodiment
Technical scheme for a better understanding of the present invention, technical solution of the present invention will be further described below in conjunction with embodiment and accompanying drawing.
Basic thought of the present invention is: the data between source node and the destination node are by the common reception of at least one receiving node and will not have error data packets to transmit, use wireless connections between source node and the receiving node, and can adopt metastable wired or fixed wireless connected mode between receiving node and the destination node, destination node can correctly receive the packet that receiving node is transmitted like this, simultaneously destination node by insert the bag sign multichannel data bag that receives is handled, recover one road complete data message.In force by a plurality of receiving nodes of reasonable disposition, make each zone in the requirement coverage have at least a receiving node can realize the correct reception of packet, like this after the processing data packets that destination node passes through multichannel is transmitted, can recover one road complete data, thus the seamless covering of wireless data transmission in having realized on a large scale.
Referring to Fig. 1, Fig. 1 receives the schematic diagram that concerns of transmission mode for multiple spot among the present invention.As shown in the figure, n receiving node arranged in whole coverage, when source node was in the coverage of certain receiving node, this receiving node can be finished the correct reception that sends packet, and the correct data bag is transmitted to destination node.Source node and receiving node use wireless connections among the figure, and transmit connect 1, transmit connect 2 ...., transmit and connect n and then generally use metastable wired or fixed wireless connected mode.
Referring to Fig. 2, Fig. 2 is the flow chart of multiple spot receiving system transmission method among the present invention.As shown in Figure 2:
In this step, source node breaks into packet with the information of Business Stream, and destination node receives and could handle based on packet after multichannel is transmitted data like this, recovers Business Stream information.In order to handle, to insert the bag sign to distinguish these packets to each packet in this step to packet.Preferably, can use the bag sign of bag counting as packet.
In this step, in order to improve the transmission quality of source node to receiving node, use digital channel coding and modulation to convert packet to baseband signal, then baseband signal is converted to radiofrequency signal and sends.
Wherein, described chnnel coding can adopt convolution code, Turbo code and loe-density parity-check code, preferably, uses loe-density parity-check code.Described modulation can be adopted single-carrier modulated modes (N can be 4,16,32 or 64) such as N rank QAM, N rank OQAM, also can adopt the multi-carrier OFDM modulation system, preferably, use the multi-carrier OFDM modulation, so that better realize the reliable reception of multipath channel.
In this step, described effective receiving node is meant that source node sentences the range of receiving of this receiving node, thereby this receiving node can be finished the correct reception that source node sends packet.The channel-decoding of receiving node is corresponding with the chnnel coding of source node, and the channel demodulation of receiving node is corresponding with the Channel Modulation of source node.Receiving node is finished channel synchronization, channel estimating and processing such as equilibrium, channel-decoding simultaneously, recovers the packet of transmission.
In this step, receiving node determines by the channel-decoding result whether above-mentioned data recovered bag exists mistake, and will exist error data packets to abandon, and transmits correct packet.In order to guarantee that the final purpose node can recover one road complete data flow, just need a plurality of receiving nodes of reasonable disposition, make source node each zone in the requirement coverage have at least a receiving node can realize the correct reception of packet when sending signal.
Wherein, can adopt cable network during above-mentioned forwarding, as Ethernet, optical fiber etc.; Also can adopt wireless network, as digital microwave, WLAN (wireless local area network) etc.
In this step, destination node can receive the packet of transmitting from a plurality of receiving nodes, in order to recover one road complete traffic data, will abandon the packet that repeats to receive, simultaneously because the time delay difference of a plurality of conversion links also needs these packet rearrangements.These processing data packets all need to use the package identification that source node inserts, to distinguish different packets.
At different transmission networks, the present invention provides two embodiment the multiple spot reception transmission method that proposes is described in detail.
Embodiment one:
With reference to Fig. 5, present embodiment uses Ethernet as transmission network, and source node uses small-power (as 2 watts of power) back pack transmitter, and the real time data of gathering in moving is carried out wireless transmission.As shown in phantom in Figure 5, the covering radius of each receiving system is according to the surrounding environment difference, can reach has about 2 kilometers to 5 kilometers, backpack transmitter uses a rf channel f1 to carry out real-time Transmission, when being in the coverage of receiving node, corresponding receiving node can be finished the normal reception that transmits, and the overlay area of different receiving nodes is combined and constituted extensive range of receiving.In order to guarantee that source node carries out seamless switching at the different receiving node areas of coverage, it is necessarily overlapping to require neighboring coverage areas to have.The number of receiving system can be set according to wireless environment, institute's overlay area flexible in size during use, realize covering fully.
At source node, will gather the packet that real time data is packaged into 188 bytes, and insert the bag sign.After this 188 byte data bag process LDPC coding and the OFDM multi-carrier modulation, be transformed into I and Q two-way digital orthogonal baseband signal through D/A, then use the low local oscillator of making an uproar mutually to carry out the orthogonal radio frequency modulation, the rf modulated signal that obtains is sent to antenna and launches after filtering, amplifying.
The workflow of receiving node and source node are roughly opposite.Low noise amplifier, channel model, mixing that the radiofrequency signal of receiving from antenna is delivered to receiver through feeder line become I and Q two-way digital orthogonal baseband signal to export to the OFDM demodulating unit, the OFDM demodulating unit is finished Clock Extraction, channel estimating and equilibrium, and balanced back data are carried out LDPC decoding and recovered 188 byte data bags.Whether forwarding module comes the judgment data bag wrong according to the decoded result of LDPC, and faultless packet is packaged into the UDP bag according to the UDP procotol, sends by the form of Ethernet interface with the UDP bag then.
At destination node, by hub the UDP bag that the multichannel Ethernet sends is sent into PC, PC extracts 188 byte data bags of forwarding from the UDP bag, by software the packet of these 188 bytes is handled.Owing to may have the packet that two or more receiving nodes receive the source node emission simultaneously, so the situation that the packet that obtains exists bag to repeat; Be used for the Ethernet transmission simultaneously and cause each receiving node forwarding data slightly different the time of advent, the packet of Jie Shouing also has the problem of a rearrangement like this.PC software is by the Treatment Analysis to bag sign, with the multiple connection of resequencing of all packets of receiving, removes and repeats the Data transmission bag, recovers one road complete real time data.As long as it is reasonable to cover the receiving node position configuration, can realize that source node receives realization inerrancy switching between range of receiving at each, promptly there is not any error code in He Cheng real-time code stream.
Embodiment two:
With reference to Fig. 6, present embodiment uses optical fiber as transmission network, can solve the seamless receptions of wireless real time data on a large scale such as comprising highway covers, railway covers, bank's the armoured van whole city tracking along the line along the line.Source node uses higher-wattage (as 20 watts of power) vehicular transmitter, and the real time data of gathering in moving is carried out wireless transmission.As shown in phantom in Figure 6, the covering radius of each receiving system is according to the surrounding environment difference, can reach has about 5 kilometers to 20 kilometers, vehicle-mounted transmitter uses a rf channel f1 to carry out real-time Transmission, when being in the coverage of receiving node, corresponding receiving node can be finished the normal reception that transmits, and different receiving nodes are placed along the vehicle movement route, and all receiving nodes are transmitted to destination node by optical fiber with the packet that receives.All real time datas that vehicle-mounted so on the way transmitter sends can be in the undistorted recovery of destination node.
The different transmission networks that only are among present embodiment and the embodiment one, the forwarding module of receiving node will be transmitted the packet of 188 bytes according to optical fiber interface; Destination node extracts these packets by optical fiber interface.And in embodiment one, packet is to transmit with the form of UDP bag by Ethernet.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; and be not used in and limit guarantor of the present invention and expand scope; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, a kind of transmission method of wireless multipoint reception is characterized in that the data between source node and the destination node are transmitted jointly by a plurality of receiving nodes, and this method comprises the steps:
A, source node break into several packets with Business Stream information to be sent, and insert the bag sign, will send after packet channel coding and the modulation then;
B, a plurality of receiving node send to source node that signal carries out channel demodulation and decoding obtains packet, and will not have error data packets to transmit to destination node;
C, destination node receive the packet of transmitting from a plurality of receiving nodes, utilize package identification to carry out processing data packets, recover the Business Stream information that passes again.
2, the method for claim 1 is characterized in that: the bag sign of packet described in the steps A is used to distinguish packet, and uses the bag sign of bag counting as packet, and described chnnel coding adopts convolution code, Turbo code or loe-density parity-check code.
3, method as claimed in claim 2, it is characterized in that: will gather the packet that real time data is packaged into 188 bytes in the steps A, insert the bag counting as the bag sign, after this 188 byte data bag process LDPC coding and the OFDM multi-carrier modulation, be transformed into I and Q two-way digital orthogonal baseband signal through D/A, then use the low local oscillator of making an uproar mutually to carry out the orthogonal radio frequency modulation, the rf modulated signal that obtains is through filtering, after the amplification, be sent to antenna and launch, wherein source node employing power is the small-power back pack transmitter of 2W or the high power vehicular formula transmitter that power is 20W.
4, the method for claim 1, it is characterized in that: a plurality of receiving nodes among the step B are wanted reasonable disposition, each zone in the requirement coverage will have at least a receiving node can realize the correct reception that source node transmits, determine by the channel-decoding result whether the packet that receives exists mistake, and will exist error data packets not transmit.
5, method as claimed in claim 4, it is characterized in that: the radiofrequency signal of receiving from antenna among the step B is delivered to the low noise amplifier of receiver through feeder line, channel model, mixing becomes I and Q two-way digital orthogonal baseband signal to export to the OFDM demodulating unit, the OFDM demodulating unit is finished Clock Extraction, channel estimating and equilibrium, balanced back data are carried out LDPC decoding and are recovered 188 byte data bags, whether forwarding module comes the judgment data bag wrong according to the decoded result of LDPC, and faultless packet is packaged into UDP bag according to the UDP procotol, send by the form of Ethernet interface then, adopt Ethernet when wherein receiving node is transmitted with the UDP bag, optical fiber, digital microwave or WLAN (wireless local area network).
6, the method for claim 1 is characterized in that, the described processing data packets of step C comprises at least and abandons the packet that repeats to receive and rearrangement packet.
7, method as claimed in claim 6, it is characterized in that: by hub the UDP bag that the multichannel Ethernet sends is sent into PC among the step C, PC extracts 188 byte data bags of forwarding from the UDP bag, PC software is by the Treatment Analysis to the bag sign, with the multiple connection of resequencing of all packets of receiving, remove and repeat the Data transmission bag, recover one road complete real time data.
8, a kind of wireless multipoint of using in each described method of claim 1-7 receives transmission system, it is characterized in that this system comprises: source node, a plurality of receiving node and destination node, wherein:
Source node is used for information to be sent is broken into packet, and inserts the bag sign, will send after packet channel coding and the modulation then;
A plurality of receiving nodes, the signal that is used for that the source node that receives is sent carries out channel demodulation and decoding obtains packet, and will not have error data packets to transmit to destination node;
Destination node receives the packet of transmitting from a plurality of receiving nodes, utilizes package identification to carry out processing data packets, recovers the Business Stream information that passes again.
9, system as claimed in claim 8 is characterized in that: described source node comprises: information package module, chnnel coding and modulation module, radio frequency sending module and antenna, wherein:
The information package module receives transmission information, is used for transmission information is broken into packet, and inserts the bag sign;
Chnnel coding and modulation module, the packet that is used for generating carries out chnnel coding and modulation conversion is a baseband signal;
Radio frequency sending module and antenna are used for baseband signal is converted to radiofrequency signal, send after the amplification.
10, system as claimed in claim 8 is characterized in that, described receiving node comprises: antenna and Receiver Module, baseband channel demodulation sign indicating number module, forwarding module, wherein:
Antenna and Receiver Module are used for received RF signal, and convert baseband signal to;
Channel demodulation and decoder module are used for baseband signal is carried out channel synchronization, channel estimating and equilibrium, channel-decoding, thereby recover packet;
Forwarding module is used for and will does not have error data packets to transmit to destination node.
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| CNA2009101483785A CN101582709A (en) | 2009-06-17 | 2009-06-17 | Transmission method for wireless multipoint receiving and system |
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| CN111784888A (en) * | 2020-07-21 | 2020-10-16 | 上海华虹计通智能系统股份有限公司 | Synchronization method and system of split type vehicle-mounted personnel positioning equipment |
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| WO2014008820A1 (en) * | 2012-07-11 | 2014-01-16 | 华为技术有限公司 | Service processing method, device and system |
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Application publication date: 20091118 |