CN105357161A - Subcarrier allocation method, device and system for power line communication OFDM system - Google Patents
Subcarrier allocation method, device and system for power line communication OFDM system Download PDFInfo
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- CN105357161A CN105357161A CN201410409196.XA CN201410409196A CN105357161A CN 105357161 A CN105357161 A CN 105357161A CN 201410409196 A CN201410409196 A CN 201410409196A CN 105357161 A CN105357161 A CN 105357161A
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- subcarrier
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Abstract
The invention discloses a subcarrier allocation method, device and system for a power line communication OFDM system. The method includes that: for each subcarrier, a sending end calculates a channel predicted value of the subcarrier in a time slot t+1 according to the situation of a response message received by the subcarrier and the probability of a low bit error rate of the subcarrier in a time slot t; and the sending end determines at least one selected subcarrier according to the calculated channel predicted values of all the subcarriers. The method is mainly used to improve the reliability of communication in the power line communication OFDM technology.
Description
Technical field
The present invention relates to power line communication technology field, particularly sub-carrier wave distribution method, the Apparatus and system of a kind of power line communication OFDM (OrthogonalFrequencyDivisionMultiplexing, OFDM) system.
Background technology
Power line communication (PowerlineCommunications, PLC) technology, as the distinctive communication technology of power industry, has wide coverage, huge advantage that cost is low, is used widely in power user power consumption information acquisition system field.Through development for many years, OFDM technology is one of mainstream technology becoming power line communication gradually, has broad application prospects at intelligent adapted electrical domain.
As power line communication OFDM technology Developing mainstream technology, self adaptation OFDM technology can according to the signal to noise ratio of each subcarrier, bit number dynamically on allocation of subcarriers and each subcarrier and transmitting power, effectively reduce noisy channels characteristic to the impact of transfer of data.
In power information acquisition system communications applications, power line channel itself also exists an intrinsic noise circumstance difficult problem severe and complicated and changeable, fail to take into full account the impact of severe complicated noise circumstance in actual applications, not only reliable communications sex chromosome mosaicism is difficult to be guaranteed, more be difficult to play the high advantage of ofdm communication speed, this has become pressing problem urgently to be resolved hurrily.
Summary of the invention
Seriously cause to solve power line communication OFDM technology noise jamming in prior art the technical problem that communication reliability is not high, the present invention proposes a kind of sub-carrier wave distribution method, Apparatus and system of power line communication ofdm system.
A sub-carrier wave distribution method for power line communication ofdm system, comprising:
For each subcarrier, transmitting terminal according to this subcarrier reception to the situation of response message and this subcarrier be in low error rate when time slot t this subcarrier of probability calculation at time slot t+1 time channel estimating value;
Transmitting terminal determines at least one subcarrier selected according to the channel estimating value of all subcarriers calculated.
A sub carries allocation device for power line communication ofdm system, comprising:
Computing module, for for each subcarrier, transmitting terminal according to this subcarrier reception to the situation of response message and this subcarrier be in low error rate when time slot t this subcarrier of probability calculation at time slot t+1 time channel estimating value;
Determination module, at least one subcarrier determining to select according to the channel estimating value of all subcarriers calculated.
Such scheme provided by the invention is that one can dynamically choose the good subcarrier of communication quality according to changes in channel characteristics in real time based on receiving terminal feedback and Bayesian sub-carrier wave distribution method, thus effectively overcome the severe noise problem of power line channel, reduce the error rate, improve the communication reliability of power line communication ofdm system.Computational methods complexity simultaneously due to the present embodiment employing is low, not only has and is easy to realization, practical advantage, and can shorten the channel estimating time, improve communication efficiency.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The flow chart of the sub-carrier wave distribution method of a kind of power line communication ofdm system that Fig. 1 provides for the embodiment of the present invention 1;
The structural representation of the sub carries allocation device of a kind of power line communication ofdm system that Fig. 2 provides for the embodiment of the present invention 2.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.Further, following embodiment is possibility of the present invention, embodiment put in order and the numbering of embodiment and its order preferably performed have nothing to do.
Embodiment 1
The present embodiment provides a kind of sub-carrier wave distribution method of power line communication ofdm system, and the method, for voltage Power Line Carrier Channel feature, realizes based on receiving terminal feedback and Bayes' theorem.
Suppose to be divided into altogether m (m is natural number) individual subcarrier in power line communication ofdm system, the signal to noise ratio S of each subcarrier
n(n=1,2 ..., m) represent, the noise value of reception is preset as S
0; Receiving terminal calculates the signal to noise ratio of each subcarrier according to the pilot frequency information of physical layer, and and S
0compare.If S
n>=S
0, then an ACK (Acknowledgement, acknowledge character) is sent to transmitting terminal, if S
n< S
0, then a NACK (NegativeAcknowledgement, negative response) is sent to transmitting terminal.Special circumstances are at the end of the timer of transmitting terminal Preset Time, and transmitting terminal can not receive any feedback, shows the non-constant of channel quality, and feedback link interrupts, and now receiving terminal is then as receiving NACK process.An, t represent whether to use at time slot t subcarrier n.
Based on foregoing, as described in Figure 1, the method comprises:
101, for each subcarrier, transmitting terminal according to this subcarrier reception to the situation of response message and this subcarrier be in low error rate when time slot t this subcarrier of probability calculation at time slot t+1 time channel estimating value;
Wherein, the situation of the above-mentioned response message received comprises: the situation of the response message received at the end of time slot t and the situation of response message received respectively under high low error rate.
Wherein, the probability being in low error rate when channel estimating value during time slot t+1 i.e. t+1.
Represent norator carrier wave with subcarrier n, 101 by such as under type realization:
According to the probability Q of the NACK response message that this subcarrier n receives under low error rate
0, the probability Q of NACK response message that receives under high bit-error of this subcarrier n
1, the situation Z of response message that receives at the end of time slot t of this subcarrier n
n, twith the probability q being in low error rate when time slot t
n, tcalculate the probability q that be in low error rate of this subcarrier n when time slot t+1
n, t+1.
Such as calculate by following formula 1
Wherein, n is subcarrier number, λ=q
n, t* Q
0+ (1-q
n, t) * Q
1; Q in formula (1)
n, tafter multiplication sign omit.
Introduce the origin of this formula (1) below:
The present embodiment sub-carrier defines two states: high bit-error state and low error rate state (are low error rate when wherein the error rate is less than negative 5 power of 10; Otherwise be high bit-error), it is q that subcarrier n is in low error rate shape probability of state
n,t∈ [0,1].Suppose that the probability receiving NACK in high bit-error state is Q
1, the probability receiving NACK in low error rate state is Q
0.If Q
1> Q
0, then transmitting terminal does not know that when chooser carrier wave each subcarrier is in low error rate state or high bit-error state, but goes out Q according to transmitting terminal cumulative calculation
1value and Q
0value (i.e. Q
1and Q
0transmitting terminal is known, and their initial value when system initialization by obtaining in the reciprocal process of sending and receiving end).Transmitting terminal is in the probability q of low error rate when time slot t according to subcarrier n
n, twith the situation Z receiving response message ACK/NACK at the end of time slot t
n, tupgrade the q of next state
n, t+1, namely according to q
n, t+1decide the service condition a of the subcarrier n of next time slot
n, t+1.The service condition of all subcarriers represents with π, π
t=[a
1(t) ..., a
n(t) ..., a
m(t)].
Work as a
n,
twhen=1, the probability that transmitting terminal receives NACK is λ=q
n, t* Q
0+ (1-q
n, t) * Q
1, (during initialization, namely the initialization value of q is 0.5), then according to Bayes' theorem, subcarrier n is in low error rate shape probability of state in the t+1 moment:
So can obtain the prediction for channel status.All subcarriers can use vector v at the channel status in t+1 moment
t+1=[q
1(t+1) ..., q
n(t+1) ..., q
m(t+1)] represent.
102, transmitting terminal determines at least one subcarrier selected according to the channel estimating value of all subcarriers calculated.
Specifically, the channel estimating value of transmitting terminal to all subcarriers calculated sorts; Use according to descending at least one subcarrier of choosing again.
Namely first by the channel estimating value q of all subcarriers
n, t+1sort, then the N number of operable subcarrier of descending selection.Owing to employing channel prediction arithmetic, each subcarrier selected is all the subcarrier compared with high-quality, therefore can effectively reduce the error rate.
The present embodiment provides one can dynamically choose the good subcarrier of communication quality according to changes in channel characteristics in real time based on receiving terminal feedback and Bayesian sub-carrier wave distribution method, thus effectively overcome the severe noise problem of power line channel, reduce the error rate, improve the communication reliability of power line communication ofdm system.Computational methods complexity simultaneously due to the present embodiment employing is low, not only has and is easy to realization, practical advantage, and can shorten the channel estimating time, improve communication efficiency.
Embodiment 2
Realize for the ease of the method in embodiment 1, the present embodiment provides a kind of sub carries allocation device of power line communication ofdm system, this device can be the transmitting terminal in embodiment 1, also can install in transmitting terminal in embodiment 1, as shown in Figure 2, comprise: computing module 21, determination module 22.
Computing module 21, for for each subcarrier, transmitting terminal according to this subcarrier reception to the situation of response message and this subcarrier be in low error rate when time slot t this subcarrier of probability calculation at time slot t+1 time channel estimating value; Determination module 22, at least one subcarrier determining to select according to the channel estimating value of all subcarriers calculated.
Wherein, the situation of the response message received comprises: the situation of the response message received at the end of time slot t and the situation of response message received respectively under high low error rate.
Correspondingly, computing module 21, specifically for the probability Q of NACK response message received under low error rate according to this subcarrier n
0, the probability Q of NACK response message that receives under high bit-error of this subcarrier n
1, the situation Z of response message that receives at the end of time slot t of this subcarrier n
n, twith the probability q being in low error rate when time slot t
n, tcalculate the probability q that be in low error rate of this subcarrier n when time slot t+1
n, t+1.
The situation of the response message wherein received at the end of time slot t comprises: at the end of time slot t, receive NACK response message, at the end of time slot t, receive ACK response message, at the end of time slot t not receiving the situation of response message in the scheduled time as receiving NACK response message.
Correspondingly, determination module 22, specifically for sorting to the channel estimating value of all subcarriers calculated, and uses according to descending at least one subcarrier of choosing.
Can according to the response message of receiving terminal feedback by combining with Bayes' theorem the availability judging subcarrier in the device that the present embodiment provides, the selection of available subcarrier is carried out in the mode of prediction, solve that power line communication OFDM technology noise jamming in prior art seriously causes communication reliability not high technical problem, not only have and be easy to realization, practical advantage, and the channel estimating time can be shortened, improve communication efficiency.
Embodiment 3
The present embodiment provides a kind of sub carries allocation system of power line communication ofdm system, and this system comprises receiving terminal and transmitting terminal;
Wherein transmitting terminal communicates with the sub carries allocation device of the power line communication ofdm system in embodiment 2, does not again repeat.
Receiving terminal, sends response message for the signal to noise ratio according to each subcarrier to described transmitting terminal.
Preferably, receiving terminal, specifically for for each subcarrier, calculates the signal to noise ratio of this subcarrier; When the signal to noise ratio of this subcarrier is not less than default noise value, send ACK response message to described transmitting terminal; Otherwise, send NACK response message to described transmitting terminal.
The system that the present embodiment provides can dynamically choose the good subcarrier of communication quality according to changes in channel characteristics in real time, thus effectively overcomes the severe noise problem of power line channel, reduces the error rate, improves the communication reliability of power line communication ofdm system.Computational methods complexity simultaneously due to the present embodiment employing is low, not only has and is easy to realization, practical advantage, and can shorten the channel estimating time, improve communication efficiency.
The device that the said system that the embodiment of the present invention provides comprises, the device provided based on embodiment 2 gets, and therefore part is not described in detail in detail to the greatest extent can device in reference example 2, is not repeated herein.
The part that technical scheme of the present invention contributes to prior art in essence is in other words the function embodied with the form of software product, in other words: even if the function body of the method for each equipment of device of the present invention, equipment or composition system performed by it or realization is hardware, but the part in fact realizing above-mentioned functions of the present invention is but module or the unit of computer software product.And this computer software product can be stored in the storage medium that can read, as the floppy disk of computer, hard disk or CD etc., comprise some instructions and perform method described in each embodiment of the present invention in order to make an equipment.
The above, be only the specific embodiment of the present invention, but the present invention can have multiple multi-form embodiment, by reference to the accompanying drawings the present invention is illustrated above, this does not also mean that the embodiment that the present invention applies can only be confined in these specific embodiments, those skilled in the art should understand, embodiment provided above is some examples in multiple preferred implementation, and the embodiment of any embodiment the claims in the present invention all should within the claims in the present invention scope required for protection; Those skilled in the art can modify to technical scheme described in each embodiment above, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent to replace or improvement etc., within the protection range that all should be included in the claims in the present invention.
Claims (10)
1. a sub-carrier wave distribution method for power line communication ofdm system, is characterized in that, comprising:
For each subcarrier, transmitting terminal according to this subcarrier reception to the situation of response message and this subcarrier be in low error rate when time slot t this subcarrier of probability calculation at time slot t+1 time channel estimating value;
Transmitting terminal determines at least one subcarrier selected according to the channel estimating value of all subcarriers calculated.
2. method according to claim 1, is characterized in that,
The situation of the described response message received comprises: the situation of the response message received at the end of time slot t and the situation of response message received respectively under high low error rate.
3. method according to claim 2, is characterized in that, described according to this subcarrier reception to the situation of response message and this subcarrier be in low error rate when time slot t this subcarrier of probability calculation at time slot t+1 time channel estimating value, specifically comprise:
According to the probability Q of the NACK response message that this subcarrier n receives under low error rate
0, the probability Q of NACK response message that receives under high bit-error of this subcarrier n
1, the situation Z of response message that receives at the end of time slot t of this subcarrier n
n, twith the probability q being in low error rate when time slot t
n, tcalculate the probability q that be in low error rate of this subcarrier n when time slot t+1
n, t+1;
Wherein, the situation of the response message received at the end of time slot t comprises: at the end of time slot t, receive NACK response message, at the end of time slot t, receive ACK response message, at the end of time slot t not receiving the situation of response message in the scheduled time as receiving NACK response message.
4. method according to claim 3, is characterized in that, the probability Q of the described NACK response message received under low error rate according to this subcarrier n
0, the probability Q of NACK response message that receives under high bit-error of this subcarrier n
1, the situation Z of response message that receives at the end of time slot t of this subcarrier n
n, twith the probability q being in low error rate when time slot t
n, tcalculate the probability q that be in low error rate of this subcarrier n when time slot t+1
n, t+1, be specially:
Wherein, n is subcarrier number, λ=q
n, tq
0+ (1-q
n, t) Q
1;
。
5. method according to claim 1, is characterized in that, at least one subcarrier that described transmitting terminal is selected according to the determination of the channel estimating value of all subcarriers calculated, and specifically comprises:
The channel estimating value of transmitting terminal to all subcarriers calculated sorts;
Use according to descending at least one subcarrier of choosing.
6. a sub carries allocation device for power line communication ofdm system, is characterized in that, comprising:
Computing module, for for each subcarrier, transmitting terminal according to this subcarrier reception to the situation of response message and this subcarrier be in low error rate when time slot t this subcarrier of probability calculation at time slot t+1 time channel estimating value;
Determination module, at least one subcarrier determining to select according to the channel estimating value of all subcarriers calculated.
7. device according to claim 6, is characterized in that, described in the situation of response message that receives comprise: the situation of the response message received at the end of time slot t and the situation of response message received respectively under high low error rate;
Described computing module, specifically for the probability Q of NACK response message received under low error rate according to this subcarrier n
0, the probability Q of NACK response message that receives under high bit-error of this subcarrier n
1, the situation Z of response message that receives at the end of time slot t of this subcarrier n
n, twith the probability q being in low error rate when time slot t
n, tcalculate the probability q that be in low error rate of this subcarrier n when time slot t+1
n, t+1;
The situation of the response message wherein received at the end of time slot t comprises: at the end of time slot t, receive NACK response message, at the end of time slot t, receive ACK response message, at the end of time slot t not receiving the situation of response message in the scheduled time as receiving NACK response message.
8. device according to claim 7, is characterized in that,
Described determination module, specifically for sorting to the channel estimating value of all subcarriers calculated, and uses according to descending at least one subcarrier of choosing.
9. a sub carries allocation system for power line communication ofdm system, is characterized in that, comprises receiving terminal and transmitting terminal;
Described transmitting terminal is as the sub carries allocation device of the power line communication ofdm system in claim 6-8 as described in any one;
Described receiving terminal, sends response message for the signal to noise ratio according to each subcarrier to described transmitting terminal.
10. system according to claim 9, is characterized in that, described receiving terminal, specifically for for each subcarrier, calculates the signal to noise ratio of this subcarrier; When the signal to noise ratio of this subcarrier is not less than default noise value, send ACK response message to described transmitting terminal; Otherwise, send NACK response message to described transmitting terminal.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112104397A (en) * | 2020-11-23 | 2020-12-18 | 国网江西省电力有限公司经济技术研究院 | MIMO power line communication data transmission method and device |
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2014
- 2014-08-19 CN CN201410409196.XA patent/CN105357161B/en active Active
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| CN102497259A (en) * | 2011-12-02 | 2012-06-13 | 中国科学院微电子研究所 | Subcarrier allocation method and device applied to power line communication |
| CN103701576A (en) * | 2013-06-26 | 2014-04-02 | 国家电网公司 | Power line communication frequency band allocation method and device |
Non-Patent Citations (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112104397A (en) * | 2020-11-23 | 2020-12-18 | 国网江西省电力有限公司经济技术研究院 | MIMO power line communication data transmission method and device |
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