CN103634089A - Method for entropy division multiplexing - Google Patents
Method for entropy division multiplexing Download PDFInfo
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- CN103634089A CN103634089A CN201310509154.9A CN201310509154A CN103634089A CN 103634089 A CN103634089 A CN 103634089A CN 201310509154 A CN201310509154 A CN 201310509154A CN 103634089 A CN103634089 A CN 103634089A
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Abstract
The invention provides a channel multiplexing algorithm-a method for entropy division multiplexing. In the channel multiplexing algorithm, high-efficiency data compression is realized by each source signal as each source signal of n source signals which are mixedly overlaid in a frequency domain and a time domain is firstly subjected to redundancy elimination entropy transformation and then is subjected to entropy coding after being discretised, different channel resources are dynamically allocated for each source signal according to different information entropy spectrum values of the n source signals, and transmission is carried out on a channel; the n source signals are recovered through entropy coding and redundancy elimination entropy inverse transformation by a receiving end according to difference of the information entropy spectrum values of each source signal, and thus channel multiplexing is realized; the channel multiplexing algorithm is integrated with an information entropy spectrum theory and a channel multiplexing theory, data compression and data integration are realized by each source signal as each source signal is subjected to redundancy elimination entropy transformation and entropy coding processing, and the channel resources are dynamically allocated according the characteristic that each source signal after compression and integration has different information contents.
Description
Technical field
The present invention relates to the multiplexed algorithm of channel of the communications field, particularly a kind of channel multiplexing method for use based on comentropy spectral theory.
Background technology
Traditional channel multiplexing method for use comprises time division multiplexing (TDM), frequency division multiplexing (FDM) and code division multiplexing (CDM).
In the transmission of analog signal, generally adopt time-division multiplexing (TDM).Time division multiplexing communication refers to that each road signal occupies different time gap and communicates on same channel.Specifically, the transmission time that exactly time is divided into some ，Jiang Ge road, uniform time slot signals is distributed in different time slots, to reach separated from each other, non-interfering object.In time-division multiplexing method, time slot is by fixed allocation is to each data source in advance, even if certain data source has data transmission, this time slot also must be distributed to it, and this has just inevitably caused the waste of frequency spectrum resource.Owing to giving specific incoming line by each time slot allocation, if these incoming lines all do not enter operating state, also just there will be idle time slot.In addition, owing to needing user's Complete Synchronization in transmitting procedure, the expense that guard time and synchronizing sequence bring, greatly reduces spectrum efficiency.
In order to improve channel utilization, digital signal is the general frequency division multiplex mode that adopts in transmitting procedure.Frequency division multiplex mode is exactly by the total bandwidth for transmission channel, is divided into several narrower sub-bands (or claim subchannel), every sub-band can as one independently transmission channel be used for transmission of one line signal.At receiving terminal, can adopt suitable band pass filter that multiple signals are separated, thereby recover needed signal.In frequency division multiplexing mode, in order to prevent the phase mutual interference between each road signal, need to leave certain guard band between adjacent two sub-frequency bands, the existence of guard band has reduced the efficiency of frequency multiplexing technique widely.In frequency division multiplexing, OFDM (Orthogonal Frequency-Division Multiplexing) is a kind of conventional mode.OFDM is divided into channel some orthogonal sub-channels exactly, converts high-speed data signal to parallel low speed sub data flow, is modulated on every sub-channels and transmits.Orthogonal signalling can, by adopting correlation technique to separate at receiving terminal, can reduce the phase mutual interference ICI between subchannel like this.Signal bandwidth on every sub-channels is less than the correlation bandwidth of channel, and therefore the flatness of can regarding as on every sub-channels declines, thereby can eliminate intersymbol interference.And because the bandwidth of every sub-channels is only the sub-fraction of former channel width, it is relatively easy that channel equalization becomes.Although OFDM technology has, strong, the anti-fading ability of anti-ISI (ISI) ability is good, the availability of frequency spectrum is high, be applicable to the advantages such as high speed data transfer, so will play a great role in the 4th third-generation mobile communication, but simultaneously, also there are the following problems: 1. very sensitive to frequency shift (FS) and phase noise, this will cause that systematic function declines, and brings difficulty to channel estimating simultaneously.2. peak value and average power are relatively large, and the increase of this ratio can reduce the power efficiency of radio frequency amplifier.3. because OFDM technology adopts in specific implementation process, insert CP(Cyclic Prefix) eliminate ISI(intersymbol interference), so further improve the availability of frequency spectrum, still have larger leeway.4. channel resource can only be according to frequency bandwidth fixed allocation.
So-called code division multiplexing refers to that transmitting terminal signal takies identical frequency band, sends at one time, and different is that each signal is assigned with different condition code (address code), at receiving terminal by the identification of its condition code is distinguished to different signals.In code-division multiplexing system, each road signal is overlapping on time domain and frequency domain, at this moment can not adopt traditional filter (for frequency multiplexing technique) and storbing gate (for time-division multiplex technology) to carry out separation signal, but use the receiver matching with transmitted signal could correctly to receive by coherent detection.CDMA (Code Division Multiple Access) is exactly a kind of mode that code division multiplexing is conventional.The different coding that so-called CDMA utilizes is exactly mutually orthogonal (or as far as possible quadrature) is distributed to different user modulation signal, realize multi-user and use communicating by letter of same frequency connecting system and network simultaneously, the coding of mutually orthogonal owing to utilizing (or as far as possible quadrature) removes modulation signal, can be by the signal spectrum bandwidth expansion of original signal.Therefore, the communication to this modulation system, is called again spread spectrum communication.CDMA is owing to having the advantages such as power system capacity is large, speech quality good, antijamming capability is strong, transmission rate is high, power spectrum density is low, in the second generation and 3G (Third Generation) Moblie, be widely applied, it also will become the key technology that needs employing in the 4th Generation Mobile Communication System.But along with improving constantly of message transmission rate, the defect of CDMA technology constantly comes out.The defect of CDMA is mainly manifested in the following aspects: 1. when high speed (broadband) transfer of data, for example message transmission rate surpasses more than tens MbPs, will inevitably be subject to the impact of intersymbol interference (ICI), while especially transmitting in the more serious wireless channel of multipath fading, intersymbol interference is even more serious, makes the application of CDMA technology become infeasible.2. multiple access serious interference.Because CDMA adopts different spreading codes, distinguish user, this just requires each user's spreading code to have extremely strong autocorrelation and extremely weak cross correlation.And in fact, due to multipath transmisstion, the interference between each user can not be eliminated completely, so CDMA system is an interference limiting system, from the interference of this community and adjacent cell, power system capacity and performance have been determined.3. near-far interference.Near-far interference just refers to the interference that the high-power signal of terminal produces the low-power level signal of distant place terminal nearby.4. the spectrum efficiency of CDMA technology is low, can not adapt to the demand of high capacity communication development.
It is multiple signals after entropy coding that entropy divides the advantage of multiplexing algorithm, and channel resource carries out according to the difference of each road signal message entropy-spectrum value
dynamicallydistribute then while, same transmission frequently on channel.At receiving terminal, utilize the otherness of the information entropy-spectrum value of source signal to receive, after entropy decoding, revert to source signal.The feature of the method maximum is that comentropy spectral technology is applied to chnnel coding, solved the restriction of above several traditional multiplex modes aspect signal frequency domain, time slot and code word, effective separated multichannel while of energy, same signal frequently, overcome the shortcoming that channel resource in OFDM (OFDM) mode can only fixed allocation, greatly improved channel utilization.
Summary of the invention
The object of this invention is to provide a kind of new channel multiplexing method for use, it adopts comentropy spectral theory and channel multiplexing technique to combine, and analyzing and processing is simultaneously with keeping pouring in defeated multiple signals.This method has solved in traditional time division multiplexing, frequency-division multiplexing method; reliability for guarantee information transmission; the drawback of setting up certain protection interval or certain guard band and the utilance of frequency band being reduced has overcome the impact that in code division multiplexing method, multiple access disturbs simultaneously.The method of this channel multiplexing, utilize de-redundancy Entropy Changes to change the method for encoding with entropy, carry out the multiline message of the same frequency range of analyzing and processing and the transmission of same time, receiving terminal utilizes the information entropy-spectrum value that each road information is different, carry out the dynamic assignment of frequency spectrum resource, greatly improved the utilization ratio of frequency spectrum resource.
According to multichannel multiplexing method of the present invention, comprise following steps:
(1) select the separate source signal ，Ge road source signal in n road through de-redundancy entropy conversion process; And
(2) the n road signal obtaining according to above-mentioned steps (1), carries out entropy coding and realizes efficient data compression, fusion; And
(3) the n road signal obtaining according to above-mentioned steps (2), calculates respectively the multidate information entropy-spectrum value of each road signal; And
(4) according to above-mentioned steps (3), obtain the different multidate information entropy-spectrum value of Ge road source signal, respectively the different channel capacity of Gei Mei road source signal dynamic assignment; And
(5) the n road mixed signal obtaining according to above-mentioned steps (4) is carried out together the transmission of signal on channel simultaneously frequently, and
(6) mixed signal obtaining according to above-mentioned steps (5),, through de-redundancy entropy conversion process, recovers n road source signal according to the difference of each road source signal multidate information entropy-spectrum value at receiving terminal, realizes the multiplexed of channel.
It is characterized in that:
At the transmitting terminal of information, n road source signal changes through de-redundancy Entropy Changes, and the method that de-redundancy Entropy Changes changes adopts poor-equal-poor mapping algorithm of butterfly cascade structure, and this algorithm has good compression effectiveness for slow parameter certificate and non-slow parameter certificate.Object is reduce or remove the correlation between data, makes the probability distribution of this signal become more regular.
Information after de-redundancy Entropy Changes changes after entropy coding, is calculated respectively the different multidate information entropy-spectrum value of each road source signal again.According to the difference of each road signal dynamics information entropy-spectrum value, can carry out channel resource
dynamic assignment.
During communication, mixed n road signal in frequency and be aliasing in time domain, mode that can not aliasing at time domain and frequency domain while having replaced communication in traditional time-division, frequency division multiplexing mode.
At the receiving terminal of signal, according to each road signal different information entropy-spectrum value separately, then through entropy decoding and the processing of de-redundancy entropy inverse transformation, can isolate n road source signal.The present invention adopts comentropy spectral technology and the multiplexed theory of channel to combine, and realized the separation of the multiple signals that frequency-domain and time-domain mixes completely.
Of particular note be exactly, the present invention is different from traditional time-division, frequency division, code division multiplexing is information source have been carried out to de-redundancy Entropy Changes changes and entropy coding is processed, reduced the length of information source data, again according to the difference of each road signal message entropy-spectrum value, carry out the dynamic assignment of frequency spectrum resource, overcome the drawback that channel resource in time-division, frequency division, code division multiplexing mode can only fixed allocation.
Of particular note be exactly; after the present invention combines comentropy spectral technology and multiplexing technique; only need be according to the difference of the dynamic entropy-spectrum value of each road information; carry out separated each road source signal; eliminate the defect that increases protection interval, guard band and protection code element in traditional time division multiplexing, frequency division multiplexing, code division multiplexing mode in order to prevent the phase mutual interference between each road signal, greatly improved frequency spectrum resource utilization rate.
Accompanying drawing explanation
By can further understanding all types of target of the present invention, feature and advantage below in conjunction with accompanying drawing to the detailed description of embodiment of the present invention, wherein:
Accompanying drawing 1 is the illustraton of model of multichannel multiplexing method of the present invention.
Accompanying drawing 2 is schematic diagrams of entropy division multiplexing device in multichannel multiplexing method of the present invention.(illustraton of model of multiplexer of the present invention)
Accompanying drawing 3 is schematic diagrams of multichannel multiplexing method of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described:
Accompanying drawing 1 shows the model framework chart of multichannel multiplexing method of the present invention.In multiplexed algorithm of the present invention, n road source signal ... separate, after entropy division multiplexer is processed, every road signal can not considered the impact of time domain and frequency domain, according to the difference of its information entropy-spectrum value, distributed dynamically different channel capacities, then same transmission frequently simultaneously on channel.Receiving terminal passes through the inverse transformation of entropy division multiplexer again, and n road primary signal is recovered.
Accompanying drawing 2 has provided the concrete structure figure of entropy division multiplexer.In this accompanying drawing, the principle of the entropy division multiplexing device of transmitting terminal is as follows: after the source signal discretization of every road, first through de-redundancy Entropy Changes, change.The object that de-redundancy Entropy Changes changes is the probability distribution that changes source symbol, reduces or eliminates the correlation between data, thereby the limit entropy that converts rear data is diminished, and realizing the object of data compression.Method that de-redundancy Entropy Changes changes adopt based on cascade butterfly structure poor-the improvement algorithm of the poor conversion of all-T, this algorithm and traditional dct transform with DWT conversion compare, be a kind of to slow parameter certificate and non-slow parameter according to better suited mapping algorithms all.In this algorithm, first data are asked to poor, then ask the average of input data at the corresponding levels and prime output data, finally ask again the difference of input data at the corresponding levels and average at the corresponding levels.
After de-redundancy entropy conversion process, it is more regular that data become, and is more suitable for entropy compression coding.So the information source after de-redundancy Entropy Changes changes, then carry out entropy network code.Entropy network code adopts the hybrid coding algorithm based on normal distribution.This algorithm has overcome in general S-Huffman algorithm can not make full use of the drawback that de-redundancy Entropy Changes changes the probability density characteristics of rear information, thereby is more suitable for entropy network code.
After entropy network code, information source length shortens, and now, again according to the result of coding, calculates the information entropy-spectrum value of every road signal, according to the difference of every road signal dynamics information entropy-spectrum value, and difference Gei Mei road signal
dynamicallythe different channel capacity of distribution, on channel simultaneously with transmission frequently.
The effect of entropy division multiplexer and the transmitting terminal of receiving terminal are just the opposite, according to the difference of n road signal message entropy-spectrum value, n road signal are received.The inverse transformation that utilizes entropy network decoding and de-redundancy Entropy Changes to change recovers primary signal.Thereby realize multiplexed object.
Accompanying drawing 3 has provided principle schematic of the present invention.Multichannel source signal shown in this accompanying drawing, although overlap completely on time domain and frequency domain, on Shang Yushangge road, signal can strictly distinguish.Frequency band and the not special requirement of time slot and restriction that entropy divides multiplexing method to take transmitted signal, its information rate that can reach is much larger than frequency division multiplexing and time-multiplexed information rate, there is higher band efficiency, compare with code division multiplexing mode, do not need to consider the impact of code word factor aspect, in the situation that transmission bandwidth is identical, the utilance of frequency band is higher.
Claims (7)
1. the multiplexed method of channel, comprises following steps:
(1) select through de-redundancy Entropy Changes, to change processing after the separate source signal ，Ge road source signal discretization in n road; And
(2) the n road signal obtaining according to above-mentioned steps (1), carries out entropy coding and realizes efficient data compression, fusion; And
(3) the n road signal obtaining according to above-mentioned steps (2), calculates respectively the multidate information entropy-spectrum value of each road signal; And
(4) according to above-mentioned steps (3), obtain the different multidate information entropy-spectrum value of Ge road source signal, respectively the different channel capacity of Gei Mei road source signal dynamic assignment; And
(5) the n road mixed signal obtaining according to above-mentioned steps (4) is carried out together the transmission of signal on channel simultaneously frequently, and
(6) mixed signal obtaining according to above-mentioned steps (5),, processes n road source signal according to the difference of each road source signal multidate information entropy-spectrum value at receiving terminal through entropy decoding and de-redundancy entropy inverse transformation, separate, and realizes the multiplexed of channel.
2. channel multiplexing method for use according to claim 1, it is characterized in that: in described step (1), the object of changing through de-redundancy Entropy Changes after the source signal discretization of n road is minimizing or removes the correlation between data, make the probability distribution of this signal become more regular, the method that de-redundancy Entropy Changes changes adopts poor-equal-poor mapping algorithm of butterfly cascade structure, and this algorithm has good compression effectiveness for slow parameter certificate and non-slow parameter certificate.
3. channel multiplexing method for use according to claim 1, is characterized in that: in described step (2) and (3), the signal after entropy coding, calculates respectively the different information entropy-spectrum value of each road source signal.
4. channel multiplexing method for use according to claim 1, is characterized in that: in described step (3) and (4), according to the difference of each road signal dynamics entropy-spectrum value, carry out channel resource
dynamic assignment.
5. channel multiplexing method for use according to claim 1, is characterized in that: in described step (4) and (5), during the transmission of mixed n road signal, its frequency and time domain can be aliasings.
6. channel multiplexing method for use according to claim 1, is characterized in that: in described step (6), only, according to each road signal different information entropy-spectrum value separately, through entropy decoding and de-redundancy entropy inverse transformation, can recover n road source signal.
7. method is easy flexibly, and during signal multiplexing, channel capacity is fully utilized.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113921A (en) * | 2014-07-11 | 2014-10-22 | 山东科技大学 | MIMO-EDM wireless communication system and method |
| CN104168085A (en) * | 2014-08-01 | 2014-11-26 | 山东科技大学 | Data compression method based on redundant entropy conversion |
| CN115499685A (en) * | 2022-09-22 | 2022-12-20 | 刘鹏 | Adaptive multiplexing coding system and method |
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| CN1492609A (en) * | 1995-06-30 | 2004-04-28 | �����ּ�����˾ | Automatic power control system for CDMA communication system |
| CN102299893A (en) * | 2011-09-29 | 2011-12-28 | 中国人民解放军理工大学 | Joint channel network coding method for bidirectional OFDM (Orthogonal Frequency Division Multiplexing) system with frequency offset |
| US20130121379A1 (en) * | 2011-11-10 | 2013-05-16 | Xiao-an Wang | Heterogeneous Pilots |
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| CN1492609A (en) * | 1995-06-30 | 2004-04-28 | �����ּ�����˾ | Automatic power control system for CDMA communication system |
| CN102299893A (en) * | 2011-09-29 | 2011-12-28 | 中国人民解放军理工大学 | Joint channel network coding method for bidirectional OFDM (Orthogonal Frequency Division Multiplexing) system with frequency offset |
| US20130121379A1 (en) * | 2011-11-10 | 2013-05-16 | Xiao-an Wang | Heterogeneous Pilots |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113921A (en) * | 2014-07-11 | 2014-10-22 | 山东科技大学 | MIMO-EDM wireless communication system and method |
| CN104113921B (en) * | 2014-07-11 | 2018-08-24 | 山东科技大学 | A kind of MIMO-EDM wireless communication systems and method |
| CN104168085A (en) * | 2014-08-01 | 2014-11-26 | 山东科技大学 | Data compression method based on redundant entropy conversion |
| CN104168085B (en) * | 2014-08-01 | 2017-11-24 | 山东科技大学 | A kind of data compression method changed based on redundancy Entropy Changes |
| CN115499685A (en) * | 2022-09-22 | 2022-12-20 | 刘鹏 | Adaptive multiplexing coding system and method |
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Application publication date: 20140312 |