CN107294629A - A kind of polarization method, device and the electronic equipment of wireless MAN channel model - Google Patents
A kind of polarization method, device and the electronic equipment of wireless MAN channel model Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/00—Monitoring; Testing
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- H04B17/391—Modelling the propagation channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
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Abstract
The embodiment of the invention discloses a kind of polarization method, device and the electronic installation of wireless MAN channel model, it is related to communication technical field.The polarization method of the wireless MAN channel model of the embodiment of the present invention includes：Obtain the SUI channel models of the wireless MAN；Choose the particular channel in the SUI signal models；Polarization code is built to the particular channel using Monte Carlo mode, and analyzes the error performance of the polarization code.In addition, the embodiment of the invention also discloses a kind of polarization device and electronic equipment of wireless MAN channel model.By the scheme of the embodiment of the present invention, transmission performance can be effectively improved.
Description
Technical field
The present invention relates to the communications field, more particularly to a kind of polarization method, device and the electricity of wireless MAN channel model
Sub- equipment.
Background technology
Wireless MAN (WMAN) technology, is broadband wireless access (BWA) technology.International Electrical and Electronics Engineer
Association (IEEE) is that WMAN has formulated the standards of IEEE 802.16.The standards of IEEE 802.16 can not only solve physical layer (PHY)
Problem of both environment and service quality (QoS), additionally it is possible to meet the demand of BWA and " last one kilometer " access market.
The channel model of wireless MAN is divided into propagation under the conditions of the channel model propagated under the conditions of sighting distance (LOS) and non line of sight (NLOS)
Channel model, the present invention only research non line of sight channel model, that is, the Stanford University Interim corrected
(SUI) channel model.Low-density checksum (LDPC) code is employed in IEEE 802.16e standards, when the code length of LDPC code
When being intended to endless, its performance can approach Shannon capacity limit.
Arikan proposes polarization code, and it is discrete in any given binary system theoretically to demonstrate polarization code
Symmetrical capacity can be reached in memoryless channel (B-DMC).Polarization code has the building method and superior reachable appearance of structuring
Amount property, therefore, it possesses critically important researching value, and gets the attention.Polarization code scheme becomes 5G control letters
Road strengthens mobile broadband (eMBB) scene codes scheme, and LDPC code becomes the uplink and downlink short code scheme of data channel.
The content of the invention
In view of this, the embodiments of the invention provide a kind of polarization method, device and the electricity of wireless MAN channel model
Sub- equipment, at least part of solution problems of the prior art.
In a first aspect, the embodiments of the invention provide a kind of polarization method of wireless MAN channel model, including：
Obtain the SUI channel models of the wireless MAN；
Choose the particular channel in the SUI signal models；
Polarization code is built to the particular channel using Monte Carlo mode, and analyzes the error performance of the polarization code.
As a kind of specific implementation of the embodiment of the present invention, use Monte Carlo mode is to the particular channel
Polarization code is built, including：
Build subchannel transmission reliability assessment function；
The transmission reliability of the particular channel is estimated, reliability parameter is obtained；
Using the small channel transmission information bit of parameter value, bit is freezed using the big transmission of parameter value.
It is embodied as reliability assessment function described in a kind of specific implementation of the embodiment of the present invention：
Wherein,It isThe joint probability of sample value.
As a kind of specific implementation of the embodiment of the present invention,
Wherein, p (yi|xi) be SUI channels transition probability.
As a kind of specific implementation of the embodiment of the present invention, use Monte Carlo mode is to the particular channel
Polarization code is built, including：
Information to the particular channel carries out Polarization Coding.
As a kind of specific implementation of the embodiment of the present invention, the information to the particular channel carries out polarization volume
Code, including：
For the code length N of given polarization code, coding formula is：
Wherein,BNIt is a permutation matrix,What is represented is F n Kronecker power.
As a kind of specific implementation of the embodiment of the present invention, use Monte Carlo mode is to the particular channel
Polarization code is built, including：
Information to the particular channel carries out polarization decoding.
As a kind of specific implementation of the embodiment of the present invention, the information to the particular channel carries out polarization and translated
Code, including：
Step 1：Decoding width L value is set, decoded since i=1；
Step 2：Calculate current metric value；
Step 3：Judge whether current path bar number is less than L, if it is, i=i+1, if it is not, then carrying out trimming path
Operation, retains the larger L paths of measurement, remaining path is all removed, then just starts to translate next bit；
Step 4：Judge whether i≤N sets up, if set up, perform step 2；If invalid, CRC check is carried out,
And obtain decoding output.
Second aspect, the embodiment of the present invention additionally provides a kind of polarization device of wireless MAN channel model, including：
Acquisition module, the SUI channel models for obtaining the wireless MAN；
Module is chosen, for choosing the particular channel in the SUI signal models；
Performing module, for building polarization code to the particular channel using Monte Carlo mode, and analyzes the polarization
The error performance of code.
Second aspect, the embodiment of the present invention additionally provides a kind of electronic equipment, and the electronic equipment includes：
At least one processor；And,
The memory being connected with least one described processor communication；Wherein,
The memory storage has can be by the instruction of at least one computing device, and the instruction is by described at least one
Individual computing device, so that at least one described processor is able to carry out the wireless metropolitan area described in foregoing any claim 1-8
The polarization method of network channel model.
Polarization method, device, the electronic equipment of wireless MAN channel model provided in an embodiment of the present invention, for wireless
The specific channel model (SUI channel models) of Metropolitan Area Network (MAN) proposes a kind of practicable polarization code constructing method, i.e. Meng Teka
Sieve is constructed, on tri- kinds of channels of SUI-1, SUI-3 and SUI-5, and polarization code and LDPC code all have certain comparativity.It is low in
Under signal to noise ratio, the performance of polarization code is better, under high s/n ratio, and the performance of LDPC code is more excellent.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be attached to what is used required in embodiment
Figure is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this area
For those of ordinary skill, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of WMAN-OFDM system block diagrams provided in an embodiment of the present invention；
Fig. 2 is a kind of SCL-CRC decoding algorithms flow chart provided in an embodiment of the present invention；
Fig. 3 is the performance comparison of polarization code and LDPC code on SUI-1 channels provided in an embodiment of the present invention；
Fig. 4 is the performance comparison of polarization code and LDPC code on SUI-3 channels provided in an embodiment of the present invention；
Fig. 5 is the performance comparison of polarization code and LDPC code on SUI-5 channels provided in an embodiment of the present invention.
Embodiment
The embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.
It will be appreciated that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of creative work is not made it is all its
Its embodiment, belongs to the scope of protection of the invention.
The SUI channels used in WMAN can be influenceed by multidiameter delay, in order to resist this influence, introduce and be based on
WMAN ofdm system, system bandwidth takes 1.75MHz.WMAN-OFDM system block diagrams are as shown in Figure 1.In Fig. 1, Polarization Coding
It is the coding and decoding of polarization code with polarization decoding, Polarization Coding uses 1/2 code check, and modulation and demodulation are two-phase PSK (BPSK)
Modulation /demodulation, S/P is serioparallel exchange, and P/S is parallel-serial conversion, insertion pilot tone be that, in order to carry out channel estimation, channel estimation is adopted
It is linear minimum mean-squared error (LMMSE) method, IFFT is 256 points of inverse Fourier transform, and FFT is 256 points of Fourier
Conversion, it is to resist the ratio of the intersymbol interference that multipath is brought, cyclic prefix time and useful time to add cyclic prefix
1/8 is taken, channel is the SUI channels of amendment, the channel has a multiplicative noise and an additive white Gaussian noise (AWGN).
In wman, usually using the performance simulation under the SUI channel models progress NLOS propagation conditions of amendment.Amendment
SUI channel models one have 6 kinds of typical channels, are SUI-1, SUI-2, SUI-3, SUI-4, SUI-5 and SUI-6 respectively.This
Six kinds of SUI channels correspond to three kinds of terrain types, and its corresponding relation is as shown in table 1.
The corresponding relation of the SUI channels of table 1 and terrain type
| Terrain type | SUI channels |
| C | SUI-1, SUI-2 |
| B | SUI-3, SUI-4 |
| A | SUI-5, SUI-6 |
In table 1, there are three kinds of different terrain types.What type A was represented is many mountain region shapes, because mountain and tree are relatively more,
Signal is when by such landform, and being often blocked must cause whole path loss very big than more serious；What Type C was represented
It is level terrain, fewer due to setting, signal is when by such landform, and the loss being subject to is very small；And type B be then between
Situation between type A and Type C, path loss is medium.
Scheme in the present invention is carried out on tri- kinds of channels of SUI-1, SUI-3 and SUI-5, and three kinds of channels are represented respectively
Three kinds of landform in mountain flat, placed in the middle and many.The parameter of three kinds of channels is as shown in table 2.
Table 2 SUI-1, SUI-3 and SUI-5 channel parameter
In table 2, what K values were represented is the ratio of direct component and scattering component power on the paths.When K is not equal to 0
When, just explanation does not only exist scattering component on the paths, also there is direct component, and it is this decline of Lay to represent the paths.
When K is equal to 0, just explanation only exists scattering component on the paths, and it is Rayleigh fading to represent the paths.With SUI-1
Exemplified by channel model, the model definition Rice channel of one three paths, K factor is respectively 4,0,0.This just illustrates：
In three paths of SUI-1 channels, what the first paths were obeyed is the L-S distribution that K factor is 4, and the second paths and the 3rd
Paths then Rayleigh distributed.
After signal is by SUI channels, the expression formula for receiving signal is：
Wherein, x (n) be the input signal h (n) of SUI channels be SUI channels impulse response, ω (n) is AWGN.Its turn
Moving probability is：
H in formula (2) and (3) is estimated by channel estimation.
Polarization code is introduced in wman, it is necessary to for the specific polarization code of the channel construction.The construction problem of polarization code,
It is exactly the select permeability of subchannel in fact, i.e. the high subchannel of selection reliability carrys out transmission information bit, selection reliability is low
Subchannel freezes bit to transmit.It can pass throughTo judge the reliability of subchannel,Parameter value is smaller, can
It is higher by property；Parameter value is bigger, and reliability is lower.
The present invention is directed to SUI channels, is constructed using Monte Carlo.Parameter can be expressed as a stochastic variable
(RV) average：
Wherein,It isThe joint probability of sample value, is calculated as follows：
P (y in formula (5)i|xi) be SUI channels transition probability.It can thus calculate allThen it is ranked up, and picks out and freeze bit position.
The code length of polarization code is N, N=2n, n is natural number.For given N, coding formula is as follows：
Wherein,
BNIt is a permutation matrix, effect is bit reversal,What is represented is F n Kronecker power, F definition
It is as follows：
WithA random subset of set { 1 ..., N } is represented,RepresentSupplementary set, then formula (6) is rewritable into such as
Lower form：
Wherein,Represent GNMiddle index belongs toRow composition submatrix.
Polarization code can be by parameter vectorTo determine.Wherein, K represents the dimension of code, also determines collection
CloseSize；K/N represents code check；Represent information aggregate；Set is freezed in expression；Represent information bit；Table
Show and freeze bit.
For example, the coding mapping of polarization code (4,2, { 2,4 }, (0,0)) is as follows：
That is, for information source (u2, u4)=(1,1) for, the code word after coding is (0,1,0,1).
The decoding algorithm of polarization code has a lot, and the present invention uses SCL-CRC decoding algorithms, is in continuous delete list
(SCL) CRC (CRC) is added on the basis of decoding algorithm.
SCL decoding algorithms, are a kind of continuous improvement for deleting (SC) decoding algorithm.The decoding algorithm is no longer only to retain
One paths, but at most retain L paths.SCL decoding algorithms are to each information bit uiTwo candidate roads will be retained
Footpath, i.e. ui=0 and ui=1, number of path can be doubled.Number of path has a upper limit, most L bars.L is an integer, represents that decoding is wide
Degree.When number of path is not more than L, number of path can be doubled constantly；When number of path is more than L, trimming path operation will be carried out,
Only retain the larger L paths of measurement, remaining path is all removed.At the end of decoding, just selected from L paths one it is optimal
It is used as decoding output.Here it is the basic thought of SCL decoding algorithms.
SCL-CRC decoding algorithms, are a kind of improvement of SCL decoding algorithms, are the final stage decoded in SCL, to L bars road
Footpath has carried out CRC check, and the path not by CRC check is directly filtered out, then again from all decodings for meeting CRC check
A most possible paths are selected in path to export as decoding.In worst case, i.e., L paths all not over
CRC check, then select a most possible paths from L bar decoding paths and exported as decoding.SCL-CRC decoding algorithms
Flow chart is as shown in Figure 2.
For SCL-CRC algorithms, L value is bigger, and performance will be better.As L=1, SCL-CRC decoding algorithms
SC decoding algorithms will be deteriorated to.
SCL-CRC decoding algorithms are comprised the following steps that：
Step 1：L=16 in decoding width L value, the present invention is set.Decoded since i=1, i.e., translate u first1Value.
Step 2：Calculate current metric value.
Step 3：Judge whether current path bar number is less than L, if it is, i=i+1, that is, start to translate next bit；Such as
It is really no, then trimming path operation is carried out, retains the larger L paths of measurement, remaining path is all removed, then just starts to translate next
Individual bit.
Step 4：Judge whether i≤N sets up, if set up, perform step 2；If invalid, illustrate that last compares
Spy has translated, then carries out CRC check, and obtain decoding output.
When carrying out performance simulation on SUI channels, the code length of polarization code uses 512,1024 and 2,048 3 kind, and decoding is used
SCL-CRC (L=16) decoding algorithm.And be analyzed from the LDPC in IEEE 802.16e standards, the code of LDPC code
Long to use 576,960 and 2,016 3 kind, decoding uses BP decoding algorithms, and maximum iteration is 50.
As shown in figure 3, on SUI-1 channels, either polarization code or LDPC code, are all that code length is longer, performance is better.
In the case of code length is comparable, the performance curve of polarization code and LDPC code occurs in that crosspoint, that is, there is threshold signal-to-noise ratio, work as letter
When making an uproar than less than the critical value, the performance of polarization code is better than LDPC code, when signal to noise ratio is higher than the critical value, the property of LDPC code
Can be more excellent.Therefore, on SUI-1 channels, polarization code has certain competitiveness.
On SUI-3 channels, as shown in figure 4, either polarization code or LDPC code, is all that code length is longer, performance is better.
In the case of code length is comparable, the performance curve of polarization code and LDPC code occurs in that crosspoint, that is, there is threshold signal-to-noise ratio, work as letter
When making an uproar than less than the critical value, the performance of polarization code is better than LDPC code, when signal to noise ratio is higher than the critical value, the property of LDPC code
Can be more excellent.Therefore, on SUI-3 channels, polarization code also has certain competitiveness.
On SUI-5 channels, simulation result also occurs in that similar phenomenon.As shown in figure 5, either polarization code is still
LDPC code, is all that code length is longer, performance is better.In the case of code length is comparable, the performance curve of polarization code and LDPC code occurs
, that is, there is threshold signal-to-noise ratio in crosspoint, when signal to noise ratio is less than the critical value, the performance of polarization code is better than LDPC code, when
When signal to noise ratio is higher than the critical value, the performance of LDPC code is more excellent.Therefore, on SUI-5 channels, polarization code also has necessarily competing
Strive power.
It should be noted that in the present invention, such as first and second or the like relational terms are used merely to one
Entity or operation make a distinction with another entity or operation, and not necessarily require or imply between these entities or operation
There is any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to contain
Lid nonexcludability is included, so that process, method, article or equipment including a series of key elements not only will including those
Element, but also other key elements including being not expressly set out, or also include being this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including the key element.
Each embodiment in this specification is described by the way of related, identical similar portion between each embodiment
Divide mutually referring to what each embodiment was stressed is the difference with other embodiment.
For device embodiment, because it is substantially similar to embodiment of the method, so the comparison of description is simple
Single, the relevent part can refer to the partial explaination of embodiments of method.
Represent in flow charts or logic and/or step described otherwise above herein, for example, being considered use
In the order list for the executable instruction for realizing logic function, it may be embodied in any computer-readable medium, for
Instruction execution system, device or equipment (such as computer based system including the system of processor or other can be held from instruction
The system of row system, device or equipment instruction fetch and execute instruction) use, or combine these instruction execution systems, device or set
It is standby and use.For the purpose of this specification, " computer-readable medium " can any can be included, store, communicate, propagate or pass
Defeated program is for instruction execution system, device or equipment or the dress for combining these instruction execution systems, device or equipment and using
Put.The more specifically example (non-exhaustive list) of computer-readable medium includes following：Electricity with one or more wirings
Connecting portion (electronic installation), portable computer diskette box (magnetic device), random access memory (RAM), read-only storage
(ROM), erasable edit read-only storage (EPROM or flash memory), fiber device, and portable optic disk is read-only deposits
Reservoir (CDROM).In addition, can even is that can be in the paper of printing described program thereon or other are suitable for computer-readable medium
Medium, because can then enter edlin, interpretation or if necessary with it for example by carrying out optical scanner to paper or other media
His suitable method is handled electronically to obtain described program, is then stored in computer storage.
It should be appreciated that each several part of the present invention can be realized with hardware, software, firmware or combinations thereof.
In the above-described embodiment, multiple steps or method can in memory and by suitable instruction be performed with storage
The software or firmware that system is performed are realized.If for example, being realized with hardware, with another embodiment, can use
Any one of following technology well known in the art or their combination are realized：With for realizing logic work(to data-signal
The discrete logic of the logic gates of energy, the application specific integrated circuit with suitable combinational logic gate circuit, programmable gate
Array (PGA), field programmable gate array (FPGA) etc..
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, the change or replacement that can be readily occurred in, all should
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be defined by scope of the claims.
Claims (10)
1. a kind of polarization method of wireless MAN channel model, it is characterised in that including：
Obtain the SUI channel models of the wireless MAN；
Choose the particular channel in the SUI signal models；
Polarization code is built to the particular channel using Monte Carlo mode, and analyzes the error performance of the polarization code.
2. the polarization method of wireless MAN channel model according to claim 1, it is characterised in that preferred, it is described
Polarization code is built to the particular channel using Monte Carlo mode, including：
Build subchannel transmission reliability assessment function；
The transmission reliability of the particular channel is estimated, reliability parameter is obtained；
Using the small channel transmission information bit of parameter value, bit is freezed using the big transmission of parameter value.
3. the polarization method of wireless MAN channel model according to claim 2, it is characterised in that
The reliability assessment function is embodied as：
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4. the polarization method of wireless MAN channel model according to claim 3, it is characterised in that：
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<mi>N</mi>
</msubsup>
<mo>|</mo>
<msubsup>
<mi>U</mi>
<mn>1</mn>
<mi>N</mi>
</msubsup>
<mo>)</mo>
</mrow>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<msup>
<mn>2</mn>
<mi>N</mi>
</msup>
</mfrac>
<munderover>
<mo>&Pi;</mo>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>N</mi>
</munderover>
<mi>p</mi>
<mrow>
<mo>(</mo>
<msub>
<mi>y</mi>
<mi>i</mi>
</msub>
<mo>|</mo>
<msub>
<mi>x</mi>
<mi>i</mi>
</msub>
<mo>)</mo>
</mrow>
</mrow>
Wherein, p (yi|xi) be SUI channels transition probability.
5. the polarization method of wireless MAN channel model according to claim 1, it is characterised in that described special using covering
Carlow mode builds polarization code to the particular channel, including：
Information to the particular channel carries out Polarization Coding.
6. the polarization method of wireless MAN channel model according to claim 5, it is characterised in that described to the spy
The information for determining channel carries out Polarization Coding, including：
For the code length N of given polarization code, coding formula is：
<mrow>
<msubsup>
<mi>x</mi>
<mn>1</mn>
<mi>N</mi>
</msubsup>
<mo>=</mo>
<msubsup>
<mi>u</mi>
<mn>1</mn>
<mi>N</mi>
</msubsup>
<msub>
<mi>G</mi>
<mi>N</mi>
</msub>
</mrow>
Wherein,BNIt is a permutation matrix,What is represented is F n Kronecker power.
7. the polarization method of wireless MAN channel model according to claim 1, it is characterised in that described special using covering
Carlow mode builds polarization code to the particular channel, including：
Information to the particular channel carries out polarization decoding.
8. the polarization method of wireless MAN channel model according to claim 1, it is characterised in that described to the spy
The information for determining channel carries out polarization decoding, including：
Step 1：Decoding width L value is set, decoded since i=1；
Step 2：Calculate current metric value；
Step 3：Judge whether current path bar number is less than L, if it is, i=i+1, if it is not, then carrying out trimming path behaviour
Make, retain the larger L paths of measurement, remaining path is all removed, then just starts to translate next bit；
Step 4：Judge whether i≤N sets up, if set up, perform step 2；If invalid, CRC check is carried out, and obtain
Output must be decoded.
9. a kind of polarization device of wireless MAN channel model, it is characterised in that including：
Acquisition module, the SUI channel models for obtaining the wireless MAN；
Module is chosen, for choosing the particular channel in the SUI signal models；
Performing module, for building polarization code to the particular channel using Monte Carlo mode, and analyzes the polarization code
Error performance.
10. a kind of electronic equipment, it is characterised in that the electronic equipment includes：
At least one processor；And,
The memory being connected with least one described processor communication；Wherein,
The memory storage has can be by the instruction of at least one computing device, and the instruction is by described at least one
Manage device to perform, so that at least one described processor is able to carry out the wireless MAN letter described in foregoing any claim 1-8
The polarization method of road model.
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