CN101047589A - Bus communication system and method - Google Patents
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- CN101047589A CN101047589A CN 200610092984 CN200610092984A CN101047589A CN 101047589 A CN101047589 A CN 101047589A CN 200610092984 CN200610092984 CN 200610092984 CN 200610092984 A CN200610092984 A CN 200610092984A CN 101047589 A CN101047589 A CN 101047589A
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Abstract
A bus communication system comprises multiple communication device being connected with each other through data bus and data bus for using at least two modulation modes to transmit at least two types of data through at least two frames between various communication devices as using the first modulation mode to transmit the first type of data by the first type of frame and using the second modulation mode to transmit the second type of data by the second frame. Its communicating method is also disclosed.
Description
Technical field
The present invention relates to the bus communication technology, relate in particular to a kind of bus communication system and method.
Background technology
The notion of home network was just known by everybody before a lot of years, but up to now, did not also have the real product input scale based on home network of a cover to use.Main cause is also not have the physical layer protocol of the proper home network of a cover to be formulated.Simultaneously because the high speed development of mechanics of communication, audio/video encoding/decoding technology, the control that the notion of home network has been paid close attention to before being not only and the communication network of secure context, the simple communication network of high-speed video stream or access aspect, but a kind of omnibearing network system of fusion.
From application point of view, should have following characteristic: ease for use, compatibility, robustness as the one family network.From the mechanics of communication angle, should have following characteristics: be a bus system, the low rate code stream of burst is arranged, more long high-speeld code-flow is arranged as the one family network.
The circuit network that is deployed in household internal generally speaking is (as power line) as shown in Figure 1, is characterized in that the communication node number is many on the bus, and the topological structure more complicated has the data flow of the many speed of many grades.
OFDM (Orthogonal Frequency Division Multiplexing, the transmission signals of modulating system OFDM) is made of frame, and each frame comprises all band informations and has a fixing duration (duration is τ as shown in Figure 2).
Power line channel is compared with other some channels has some special characteristics, during especially as bus transfer.It is bigger etc. that its feature mainly contains the selectivity decline of frequency, apparent in view multipath effect, time-varying characteristics, circuit background noise.Channel with these characteristics requires receiver that channel is had more intense adaptive tracing ability in communication.As among Fig. 1 when A1 and C2 carry out communication, the signal that C2 receives has the signal that directly sends from A1, and the reflected signal from other different nodes is arranged, simultaneously because the position of node and number different, the time that these reflected signals arrive, strong and weak all different.Require to have reasonable time domain equalization and/or frequency domain compensation at receiving terminal.But the character rate of OFDM technology itself is lower, when using the Cyclic Prefix technology simultaneously, can loosen certain requirement aspect time domain equalization.
As shown in Figure 1, suppose when A1 and C2 when carrying out the communication of big data quantity, A2 needs and B1 carries out the communication of the smaller control information of some data volumes.
If use the method for time-division, will stop the communication of A1 and C2, carry out communication for A2 and B1 used Frequency Distribution.Because the feature of circuit will have been spent the long time and trained in A2 and B1 energy normal communication.When switching to A1 and C2 after A2 and B1 communication are finished, the parameter of physical layer that may be original has not too adapted to present condition.If it is many that the node of small data quantity communication is carried out in requirement,, make the node of big data quantity communication be subjected to bigger influence owing to will carry out frequent switching.
If use the method for frequency division, the physical link that just is necessary for each possibility communication distributes a frequency resource, has 121 links up and down as shown in Figure 1, must be divided into 121 parts to whole frequency band.The operating rate of each link can not be too high like this, simultaneously also more complicated when carrying out network design.
Therefore, need a kind of bus communication system that satisfies domestic. applications, when satisfying all nodes and carrying out the low speed control data transmission, can satisfy the transmission of high-speed data.
Summary of the invention
Main purpose of the present invention is to provide a kind of bus communication system and method, problem such as the transmission that is used to overcome high-speed data that limitation and defective owing to prior art cause and low speed data interacts and transmission efficiency is lower.
To achieve these goals, according to a first aspect of the invention, the invention provides a kind of bus communication system.Bus communication system comprises: a plurality of communication equipments are connected to each other by data/address bus; And data/address bus, use at least two kinds of modulation systems data by at least two types of at least two kinds of frames transmission between a plurality of communication equipments, wherein, first kind frame uses first modulation system to transmit primary sources, and the second class frame uses second modulation system to transmit secondary sources.
Primary sources can be high-speed datas.First modulation system can be the OFDM modulation system.First kind frame can be the OFDM Frame.
Secondary sources can be low speed datas.Low speed data can comprise and is used to manage the data that are used to transmit the IA High Speed Channel of high-speed data with initialization.Second modulation system can be QPSK, PSK, FSK or simple and easy OFDM modulation system.The second class frame can be a synchronization frame.
The second class frame can comprise frame head, destination address, source address, control command, continuity instruction, user definition data and check code.Whether the time slot of the second class frame of continuity instruction expression sending node after sending current message also sends message.
The transmission that can hocket of one second class frame and a plurality of first kind frame.
The character rate of second modulation system is the integral multiple of the character rate of first modulation system preferably.
The whole frequency band of bus communication system can be divided into a plurality of frequency pools, a plurality of frequency pool chopping phases information together.
To achieve these goals, according to a second aspect of the invention, the invention provides a kind of bus communication.Bus communication uses at least two kinds of modulation systems data by at least two types of at least two kinds of frames transmission between a plurality of communication equipments, wherein, first kind frame uses first modulation system to transmit primary sources, and the second class frame uses second modulation system to transmit secondary sources.
Primary sources can be high-speed datas, and first modulation system can be the OFDM modulation system, and first kind frame can be the OFDM Frame.
Secondary sources can be low speed datas, and second modulation system can be QPSK, PSK, FSK or simple and easy OFDM modulation system, and the second class frame can be a synchronization frame.
The second class frame can comprise the continuity instruction, is used to represent whether the time slot of the second class frame of sending node after sending current message also sends message.
The transmission that can hocket of one second class frame and a plurality of first kind frame.
The character rate of second modulation system is the integral multiple of the character rate of first modulation system preferably.
Whole transmission band can be divided into a plurality of frequency pools, a plurality of frequency pool chopping phases information together.
Pass through technique scheme, the present invention is by using a kind of modulation technique in the regular hour sheet, be used for transmitting the data of some feature, and in other timeslice, use other a kind of modulation technique, be used for transmitting the data of some other feature, realized to transmit simultaneously the bus communication of the efficient stable of high-speed data and low speed data.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the circuit of home network;
Fig. 2 is the schematic diagram of data frame structure in the bus system;
Fig. 3 is the data frame structure schematic diagram according to bus communication of the present invention;
Fig. 4 is the structure chart according to the anchor-frame of the transmission low speed data of the embodiment of the invention;
Fig. 5 is the distribution schematic diagram according to the synchronization frame of the embodiment of the invention; And
Fig. 6 is the frequency band schematic diagram according to the embodiment of the invention.
Embodiment
Describe the present invention below with reference to the accompanying drawings in detail.
With reference to figure 3, in bus communication system of the present invention and method, make the interconnected data/address bus of a plurality of communication equipments use at least two kinds of modulation systems data by at least two types of at least two kinds of frames transmission between a plurality of communication equipments, wherein, first kind frame uses first modulation system to transmit primary sources, and the second class frame uses second modulation system to transmit secondary sources.
The present invention has set up the bus communication system that a cover satisfies domestic. applications, when satisfying all nodes and carrying out the low speed control data transmission, can satisfy the transmission of high-speed data, is a kind of intelligent bus system with self scheduling function.
The present invention mainly is to use multiple modulation technique to solve the function that transmits high-speed data and low speed data in same bus system simultaneously.Sum up according to actual environment for use, data are at a high speed just torn chain in case set up after this link just needs to use the regular hour often as access, video flowing etc.And the control data of some low speed is to be used for transmitting some instant control informations (message), in case may will tear chain open after setting up such link at once.Based on this concrete condition, the message of transmitting low speed with the modulation system of OFDM is not too suitable, the present invention uses QPSK (Quadrature Phase Shift Keying, Quadrature Phase Shift Keying) or PSK (Phase Shift Keying, phase shift keying) or FSK (FrequencyPhase Shift Keying, frequency shift keying) or the modulation system of simple and easy OFDM transmit these message, use the OFDM modulation system to transmit data-message at a high speed.
The simple and easy OFDM modulation system of explained later.Use the OFDM modulation technique as xDSL, because the decay and the The noise of each subcarrier, the bit number that each subcarrier can carry is different.Owing to wanting the high efficiency reason such as channel capacity of utilizing, in the xDSL standard, also defined a Fine Gain parameter, be used for adjusting the transmitted power of transmitter.So these parameters are receiving terminals by train, process such as study obtains.Receiving terminal must be delivered to transmitting terminal to these information, uses new parameter work simultaneously on an identical moment both sides then.Simply described the working method of OFDM modulation among the xDSL above, and simple and easy OFDM mode comprises exactly or all do not comprise: 1) each subcarrier uses fixing bit to load number, as 2 bits or 1 bit; 2) each subcarrier uses fixing power to send; 3) error correction codogram frame and OFDM intersymbol have significantly definite relation, or do not use any code means; 4) before normal communication without any need for the training of form.
As shown in Figure 2, the structure of Frame is that a synchronization frame adds N OFDM Frame.Wherein this N OFDM Frame is used for transmitting high speed data, and this synchronization frame is used for transmitting low speed data.
Also have an advantage to be exactly when using QPSK or PSK or FSK or simple and easy OFDM, as the AGC of receiving terminal (Automatic Gain Control, automatic gain control) be not adjusted to suitable degree and when making signal cut the top, communication can also normally be carried out.
Multiplexing and the agreement of low speed communication link is described below:
As shown in Figure 4, the low speed communication message uses the message of anchor-frame form, comprising:
The frame head of a byte length is used for representing the initial of message, is used in ofdm system representing that this frame is a synchronization frame simultaneously.
The destination address of b byte length is used for representing the object that this frame message sends.
The source address of c byte length is used for representing the sender of this frame message, if direct this address of answer just when this message requires to reply.
The control command of d byte is used for representing that the recipient is receiving the action of being done after this message.
The continuity instruction of e byte is used for representing also needing to send message in the next timeslice of sending node after sending this message.
The user definition data of f byte are to keep to give more user-defined private contents.
The check code of g byte.
As shown in Figure 5, the synchronization frame that occurs in succession uses for different sending nodes according to fixing (as offered) order assignment.Suppose to have 4 sending nodes, sending node 1 sends message at synchronization frame 1 time slot, and sending node 2 sends message at synchronization frame 2 time slots, and the rest may be inferred.
But be not that each sending node all has data to need to send in the moment of its regulation, when using the continuity instruction, this sending node shows, at next time slot is when not sending data, this sending node does not just send data in next one circulation, and the shared time slot of this sending node just can be used by other sending node.Also can show at following two time slots or other time slot not send data, these time slots be allowed out use to other sending node by continuity instruction.
For the transmission signal spectrum that makes PSK or QPSK or FSK or simple and easy OFDM and the transmission frequency spectrum of OFDM are complementary, the character rate that requires PSK or QPSK or FSK or simple and easy OFDM is the integral multiple of the character rate of ofdm system.As shown in Figure 6, the character rate of PSK or QPSK or FSK or simple and easy OFDM is 3 times of character rate of ofdm system, and wherein the slash part of filling is represented the sub-band of OFDM, and the part that grey is filled is represented the sub-band of PSK or QPSK or FSK or simple and easy OFDM.Because the relation of character rate, the sub-band of PSK or QPSK or FSK or simple and easy OFDM comprises the sub-band of 3 OFDM.
Whole frequency band is divided into different frequency pool.All information is modulated in each frequency pool, and as shown in Figure 6, frequency pool m medium frequency A, B and C have modulated a low speed data frame, in frequency pool n, modulated too with frequency pool m in identical information.Content and frequency A, the B, the C that are frequency D, E, F modulation specifically are consistent.And the like frequency pool k too, if divided higher frequency pool also by that analogy.Its main purpose is possible certain frequency pool to be flooded fully by some signals or noise, can demodulate information from other frequency pool like this.Might some information be that demodulation is come out among the frequency A from frequency pool m, some information be that demodulation is come out among the frequency H from frequency pool k.
The present invention also has an advantage to be exactly, for the data control equipment of top said low speed, often fairly simple or to the cost requirement of communication apparatus than higher; And high-speed equipment is not very harsh to the requirement of this cost.The data control equipment of low speed only need comprise the modulation-demodulation circuit of PSK or QPSK or FSK or simple and easy OFDM like this, simultaneously the frequency of using when using PSK or QPSK or FSK or simple and easy OFDM is unnecessary high as OFDM, and is favourable to the analogue device (A/D, D/A etc.) and the reduction of digital device (DSP etc.) cost of the data control equipment of low speed like this.
The present invention has provided a kind of bus communication method of many communication nodes, is very suitable for carrier wave system among a small circle, especially the household power carrier system.Based Intelligent Control to household electrical appliance etc. provides a bus platform very easily.
Although it should be noted that the present invention the home bus communication system is described as an example, clearly, the present invention is not limited thereto, and the present invention is applicable to that any needs transmit the bus system of high-speed data and low speed data simultaneously.
In sum, the invention provides a kind of bus communication mode.In the regular hour sheet, use a kind of modulation technique, be used for transmitting the data of some feature.In other timeslice, use other a kind of modulation technique, be used for transmitting the data of some other feature.
The present invention also provides a kind of bus communication mode, and this communication modes is defined as several levels to physical layer according to the characteristic of data.Can use the low hardware circuit of price comparison when using low level can satisfy certain demand, use rank than higher can the higher hardware circuit of use cost and satisfy than higher transmission performance simultaneously.The function of high level hardware circuit comprises the function of low-level hardware circuit simultaneously.On bus network, can use low-level hardware circuit and high level hardware circuit simultaneously.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (17)
1. a bus communication system is characterized in that, comprising:
A plurality of communication equipments are connected to each other by data/address bus; And
Described data/address bus, use at least two kinds of modulation systems data by at least two types of at least two kinds of frames transmission between described a plurality of communication equipments, wherein, first kind frame uses first modulation system to transmit primary sources, and the second class frame uses second modulation system to transmit secondary sources.
2. bus communication system according to claim 1 is characterized in that described primary sources are high-speed datas, and described secondary sources are low speed datas.
3. bus communication system according to claim 2, it is characterized in that, described first modulation system is the OFDM modulation system, and described second modulation system is frequency shift keying, phase shift keying, Quadrature Phase Shift Keying or simple and easy OFDM modulation system.
4. bus communication system according to claim 3 is characterized in that, described first kind frame is the OFDM Frame, and the described second class frame is a synchronization frame.
5. bus communication system according to claim 2 is characterized in that, described low speed data comprises and is used to manage the data that are used to transmit the IA High Speed Channel of high-speed data with initialization.
6. bus communication system according to claim 2 is characterized in that, the described second class frame comprises frame head, destination address, source address, control command, continuity instruction, user definition data and check code.
7. bus communication system according to claim 6 is characterized in that, whether the time slot of the described second class frame of described continuity instruction expression sending node after sending current message also sends message.
8. bus communication system according to claim 1 is characterized in that, the transmission that hockets of described second a class frame and a plurality of described first kind frame.
9. bus communication system according to claim 1 is characterized in that, the character rate of described second modulation system is the integral multiple of the character rate of described first modulation system.
10. bus communication system according to claim 1 is characterized in that the whole frequency band of described bus communication system is divided into a plurality of frequency pools, described a plurality of frequency pool chopping phases information together.
11. bus communication, it is characterized in that, use at least two kinds of modulation systems data by at least two types of at least two kinds of frames transmission between described a plurality of communication equipments, wherein, first kind frame uses first modulation system to transmit primary sources, and the second class frame uses second modulation system to transmit secondary sources.
12. bus communication according to claim 11 is characterized in that, described primary sources are high-speed datas, and described first modulation system is the OFDM modulation system, and described first kind frame is the OFDM Frame.
13. according to claim 11 or 12 described bus communications, it is characterized in that described secondary sources are low speed datas, described second modulation system is QPSK, PSK, FSK or simple and easy OFDM modulation system, the described second class frame is a synchronization frame.
14. bus communication according to claim 13 is characterized in that, the described second class frame comprises the continuity instruction, is used to represent whether the time slot of the described second class frame of sending node after sending current message also sends message.
15. bus communication according to claim 11 is characterized in that, the transmission that hockets of described second a class frame and a plurality of described first kind frame.
16. bus communication according to claim 11 is characterized in that, the character rate of described second modulation system is the integral multiple of the character rate of described first modulation system.
17. bus communication according to claim 11 is characterized in that, whole transmission band is divided into a plurality of frequency pools, described a plurality of frequency pool chopping phases information together.
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| CN105391666B (en) * | 2015-12-16 | 2018-09-25 | 四川灵通电讯有限公司 | Multi-service bus transmission system and transmission method based on FSK modulation demodulation |
| CN105391666A (en) * | 2015-12-16 | 2016-03-09 | 绵阳灵通电讯设备有限公司 | Multi-service bus transmission system and transmission method based on FSK modem |
| CN112673604A (en) * | 2018-09-11 | 2021-04-16 | 意法半导体股份有限公司 | Method for transmitting information, corresponding device, system, mode of operation and signal |
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