CN103491048A - Method for achieving high-speed broadcast in broadband power line carrier communication - Google Patents
Method for achieving high-speed broadcast in broadband power line carrier communication Download PDFInfo
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- CN103491048A CN103491048A CN201310440584.XA CN201310440584A CN103491048A CN 103491048 A CN103491048 A CN 103491048A CN 201310440584 A CN201310440584 A CN 201310440584A CN 103491048 A CN103491048 A CN 103491048A
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Abstract
The invention discloses a method for achieving broadcast in broadband power line carrier communication. The method includes the steps that a sending end sends N explorer frames, and receiving ends obtain modulation modes of m available subcarriers according to the calculation result of the explorer frames and return the modulation modes to the sending end; for each subcarrier, the sending end selects the lowest modulation mode in all the returned results as the high-speed broadcast modulation mode according to the results returned by the receiving ends; the sending end sends the obtained broadcast modulation modes of the m subcarriers to all the receiving ends; the sending end sends data in a the high-speed broadcast modulation mode, and all the receiving ends demodulate the data in a high-speed broadcast modulation mode. By the adoption of the method, the problem that the broadcast rate is low in an existing broadband power line communication scheme is solved, and the data throughput rate of a system is improved.
Description
Technical field
The present invention relates to the power-line carrier communication field, relate in particular to the method that realizes high-speed broadcast in broadband power line carrier communication;
Background technology
OFDM (OFDM) technology is a kind of multi-carrier modulation (MCM) technology, there is good anti-multipath noiseproof feature, and there is very high spectrum utilization efficiency, and not only can improve the availability of frequency spectrum, can also resist the frequency selective characteristic of power line channel.Therefore in power line communication, utilizing the OFDM technology to modulate becomes an optimal selection.
In existing ofdm communication network, before communication, all need with the channel estimating technology determine certain particular channel the modulation parameter of each sub-band, wherein modulation parameter changes along with the change of channel.Therefore in traditional ofdm communication network, mainly use the high speed unicast communication to carry out communicating by letter between transmitting terminal and receiving terminal, and broadcast is in order to yield to the otherness of different channels, general by robustness the highest lowest modulation pattern carry out.In some occasion, low speed broadcast has limited the transmission rate of data greatly;
Summary of the invention
(1) technical problem that will solve
In view of this, main purpose of the present invention is to provide a kind of method that realizes high-speed broadcast in broadband power line carrier communication, to solve the problem that can't realize high-speed broadcast in existing broadband power line communication scheme, improves the entire system performance.
(2) technical scheme
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of method that realizes high-speed broadcast in broadband power line carrier communication, is characterized in that, the method realizes based on the OFDM technology, comprising:
Transmitting terminal sends N explore frame, and receiving terminal draws the modulation system of m available subcarrier according to the result of calculation of explore frame, and it is returned to transmitting terminal;
For each subcarrier, the result that transmitting terminal returns according to receiving terminal, select modulation system minimum in all returning results as the high-speed broadcast modulation system;
Transmitting terminal sends to all receiving terminals by the broadcast modulation system of m subcarrier obtaining by unicast mode;
Transmitting terminal is used the high-speed broadcast modulation system to send data, and all receiving terminals are used high-speed broadcast modulating mode demodulating data;
Transmitting terminal described in such scheme sends N explore frame, and receiving terminal draws the modulation system of m available subcarrier according to the result of calculation of explore frame, and the step that it is returned to transmitting terminal comprises: transmitting terminal sends N explore frame to network; Each receiving terminal is used the explore frame received to carry out channel estimating, draws the modulation system of each subcarrier in available band according to the channel estimating result.Receiving terminal is used clean culture to send to transmitting terminal channel estimating result separately;
Described in such scheme, for each subcarrier, the result that transmitting terminal returns according to receiving terminal, select modulation system minimum in all returning results as the high-speed broadcast modulation system, and concrete steps comprise: transmitting terminal receives the modulation system that all receiving terminals return.For each subcarrier F
i(1<=i<=m), transmitting terminal selects all receiving terminals to return results minimum a kind of as subcarrier F of middle modulating mode
ithe high-speed broadcast modulation system;
Transmitting terminal described in such scheme sends to the concrete steps of all receiving terminals to comprise by unicast mode the broadcast modulation system of m subcarrier obtaining: transmitting terminal is used clean culture to send to one by one each receiving terminal the high-speed broadcast modulation system of whole frequency band;
Transmitting terminal described in such scheme is used the high-speed broadcast modulation system to send data, all receiving terminals are used the concrete steps of high-speed broadcast modulating mode demodulating data to comprise: when needs are used high-speed broadcast to send data, transmitting terminal is used high-speed broadcast modulation system modulating data and sends among network; When each receiving terminal receives broadcast, by the high-speed broadcast modulation system received before, carry out the demodulation broadcast data.Thereby realize high-speed broadcast.
(3) beneficial effect
From technique scheme, can find out, the present invention has following beneficial effect:
1, the method that realizes high-speed broadcast in broadband power line carrier communication provided by the invention, by to each receiving terminal, send explore frame and select each sub-band can bear the lowest modulation mode form the method for high-speed broadcast modulation system, in ofdm system, overcome the shortcoming that can only use the lowest modulation pattern to be broadcasted, improved the system data throughput;
2, the method that realizes high-speed broadcast in broadband power line carrier communication provided by the invention, the pattern based on unicast tunnel assessment, realize simple and reliablely, when having completed high-speed broadcast, do not increase system complexity;
The accompanying drawing explanation
Fig. 1 is the method flow diagram of realizing high-speed broadcast in broadband power line carrier communication provided by the invention;
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and, with reference to accompanying drawing, the present invention is described in more detail.
Fig. 1 is the method flow diagram of realizing high-speed broadcast in broadband power line carrier communication provided by the invention.In this example, 1 transmitting terminal and 8 receiving terminals are arranged, use 917 subcarriers.Concrete steps are as follows:
Step 1:
Transmitting terminal sends 20 explore frames, and the target MAC (Media Access Control) address of each explore frame is broadcast address, and the explore frame that 8 receiving terminals are used respectively to receive carries out channel estimating, draws the parameter of the modulation system of each subcarrier in 917 subcarriers, is designated as
Ai1，Ai2,?...?,Ai917,
Wherein i is receiving terminal number, 1≤i≤8,1 ... 917 is subcarrier number;
Step 2:
Each receiving terminal returns to transmitting terminal by these 917 parameters by message;
For j subcarrier in 917 subcarriers, the minimum in the modulation system parameter of 8 these subcarriers of transmitting terminal selection is as the high-speed broadcast modulation system B parameter j of this subcarrier,
Bj=Min(A1j, A2j ... A8j), wherein j is subcarrier number, 1≤j≤917
Transmitting terminal forms message by the high-speed broadcast modulation system parameter of 917 subcarriers and sends to all receiving terminals.So far, transmitting terminal and receiving terminal have all obtained the high-speed broadcast modulation parameter of 917 subcarriers;
Step 3:
Transmitting terminal is used the high-speed broadcast modulation system to send data, and all receiving terminals are used high-speed broadcast modulating mode demodulating data;
Realize the method for high-speed broadcast by above step, the broadcast channel solved in the situation of the different channels property of there are differences is estimated, has improved the system data throughput;
The method of high-speed broadcast above, has been described.Although the present invention describes with reference to specific embodiment, clearly, those of ordinary skill in the art, in the situation that be not offset invention scope and the spirit that claims limit, can also make various modifications and changes to these embodiment.Therefore, specification and accompanying drawing are descriptive, rather than determinate;
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. a method that realizes high-speed broadcast in broadband power line carrier communication, is characterized in that, the method realizes based on the OFDM technology, comprising:
Transmitting terminal sends N explore frame, and receiving terminal draws the modulation system of m available subcarrier according to the result of calculation of explore frame, and it is returned to transmitting terminal;
For each subcarrier, the result that transmitting terminal returns according to receiving terminal, select modulation system minimum in all returning results as the high-speed broadcast modulation system;
Transmitting terminal sends to all receiving terminals by the broadcast modulation system of m subcarrier obtaining;
Transmitting terminal is used the high-speed broadcast modulation system to send data, and all receiving terminals are used high-speed broadcast modulating mode demodulating data.
2. the method that realizes high-speed broadcast in broadband power line carrier communication according to claim 1, it is characterized in that, described transmitting terminal sends N explore frame, receiving terminal draws the modulation system of m available subcarrier according to the result of calculation of explore frame, and the step that it is returned to transmitting terminal comprises:
Transmitting terminal sends N explore frame to network;
Each receiving terminal is used the explore frame received to carry out channel estimating, draws the modulation system of each subcarrier in available band according to the channel estimating result; Receiving terminal is used clean culture to send to transmitting terminal channel estimating result separately.
3. the method that realizes high-speed broadcast in broadband power line carrier communication according to claim 1, it is characterized in that, described for each subcarrier, the result that transmitting terminal returns according to receiving terminal, during N of selection returns results, minimum modulation system comprises as high-speed broadcast modulation system concrete steps:
Transmitting terminal receives the modulation system that all receiving terminals return;
For each subcarrier F
i(1<=i<=m), transmitting terminal selects all receiving terminals to return results minimum a kind of as subcarrier F of middle modulating mode
ithe high-speed broadcast modulation system.
4. the method that realizes high-speed broadcast in broadband power line carrier communication according to claim 1, is characterized in that, described transmitting terminal sends to the concrete steps of all receiving terminals to be the broadcast modulation system of m subcarrier obtaining:
Transmitting terminal is used low speed broadcast transmission or clean culture to send to one by one each receiving terminal the high-speed broadcast modulating mode of whole frequency band.
5. the method that realizes high-speed broadcast in broadband power line carrier communication according to claim 1, it is characterized in that, described transmitting terminal is used the high-speed broadcast modulation system to send data, and all receiving terminals are used the concrete steps of high-speed broadcast modulating mode demodulating data to be:
When needs are used high-speed broadcast to send data, transmitting terminal is used high-speed broadcast modulation system modulating data and sends among network;
When each receiving terminal receives broadcast, by the high-speed broadcast modulation system received before, carry out the demodulation broadcast data; Thereby realize high-speed broadcast.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310440584.XA CN103491048A (en) | 2013-09-25 | 2013-09-25 | Method for achieving high-speed broadcast in broadband power line carrier communication |
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| CN201310440584.XA CN103491048A (en) | 2013-09-25 | 2013-09-25 | Method for achieving high-speed broadcast in broadband power line carrier communication |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111108525A (en) * | 2017-07-24 | 2020-05-05 | 感通有限公司 | System and method for distance-based secure communication over an unsecured communication channel |
| CN114930731A (en) * | 2020-02-26 | 2022-08-19 | 华为技术有限公司 | Transmission mode determination method for power line communication and related device |
-
2013
- 2013-09-25 CN CN201310440584.XA patent/CN103491048A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111108525A (en) * | 2017-07-24 | 2020-05-05 | 感通有限公司 | System and method for distance-based secure communication over an unsecured communication channel |
| CN114930731A (en) * | 2020-02-26 | 2022-08-19 | 华为技术有限公司 | Transmission mode determination method for power line communication and related device |
| CN114930731B (en) * | 2020-02-26 | 2023-09-22 | 华为技术有限公司 | Method and related device for determining transmission mode of power line communication |
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Application publication date: 20140101 |