CN104283835B - A kind of quadrature amplitude modulation soft bit demodulation method and its device - Google Patents
A kind of quadrature amplitude modulation soft bit demodulation method and its device Download PDFInfo
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- CN104283835B CN104283835B CN201310274884.5A CN201310274884A CN104283835B CN 104283835 B CN104283835 B CN 104283835B CN 201310274884 A CN201310274884 A CN 201310274884A CN 104283835 B CN104283835 B CN 104283835B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3809—Amplitude regulation arrangements
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Abstract
The embodiment of the present application discloses a kind of quadrature amplitude modulation soft bit demodulation method.This method includes：The affiliated subregion of each constellation point is predefined on the corresponding Gray's constellation complex plane of bit to be demodulated, each subregion corresponds to a perpendicular bisector；Determine affiliated subregion of the constellation point for receiving symbol mapping on the corresponding Gray's constellation complex plane of the bit to be demodulated comprising bit to be demodulated；It calculates and receives symbol to the vertical range of corresponding perpendicular bisector comprising bit to be demodulated, using the distance as the soft bit values of bit to be demodulated；When the reception symbol comprising bit to be demodulated, which is located at perpendicular bisector, includes the one side of the first bit value, the soft bit values are positive value, when the reception symbol comprising bit to be demodulated, which is located at perpendicular bisector, includes the one side of the second bit value, which is negative value.Disclosed herein as well is a kind of quadrature amplitude modulation soft bit demodulating equipments.The embodiment of the present application can improve the efficiency of soft bit demodulation.
Description
Technical field
This application involves field of communication technology, more particularly to a kind of quadrature amplitude modulation (QAM) soft bit demodulation method and
Its corresponding device.
Background technology
Modern Communication System is to improve the availability of frequency spectrum, generally use high order modulation.Quadrature amplitude modulation (Quadrature
Amplitude Modulation, QAM) it is common high-order modulating, since order of modulation M can be 4,8,16,32,
It may also reach up more than 128,256 etc..After using quadrature amplitude modulation, decoding system generally use Soft decision decoding
BICM (Bit-Interleaved Coded Modulation), this decoded mode requirement demodulator output soft bit information.
Soft bit information is usually weighed with the log-likelihood ratio (Log-Likelihood Ratio, LLR) for receiving bit, i.e.,：
In above formula：R is the complex symbol received, and b is some bit received in symbol.
Under Gaussian white noise channel, the mode of prior art demodulation soft bit is：Assuming that in Gray's planisphere (in the figure
Each constellation point correspond to the mark signal that QAM transmitting signals are concentrated, constellation point generally use is both horizontally and vertically etc.
The square net configuration of spacing) in the probability that occurs of each constellation point it is equal, then likelihood ratio LLR (b) is obtained according to the following formula：
In above formula：R is the complex symbol received, and s is some constellation point in Gray's planisphere,Represent that b corresponds to for 0
Constellation point sets,Expression b be 1 corresponding constellation point sets, σ2The power spectral density of white Gaussian noise.In this manner
Demodulation soft bit information is related to exponent arithmetic, and operand is quite big.For this purpose, occur a kind ofization in actual application
Simple demodulation method, this method only take maximum in the summation formula of molecule denominator one, i.e.,：
Exponent arithmetic is converted into the calculating of two minimum ranges by the soft bit demodulation method after simplification, by two minimum Europe
The difference of family name's distance is as corresponding bit Soft Inform ation.Although this demodulation method no longer carries out complicated exponent arithmetic, also need
It asks for receiving symbol and the distance of each constellation point in Gray's planisphere, the exponent number of quadrature amplitude modulation is higher, Gray's constellation
On constellation point it is just more, the amount of calculating will be multiplied, extend handling duration, so as to reduce demodulation soft bit information
Efficiency.
The content of the invention
In order to solve the above technical problems, the embodiment of the present application provide a kind of quadrature amplitude modulation soft bit demodulation method and
Its corresponding device to simplify operand, improves soft bit demodulation efficiency.
The quadrature amplitude modulation soft bit demodulation method that the application provides includes：
The affiliated subregion of each constellation point is predefined on the corresponding Gray's constellation complex plane of bit to be demodulated, each
Subregion corresponds to a perpendicular bisector, and the perpendicular bisector receives the first nearest constellation point of symbol and for distance in subregion one is default
The perpendicular bisector of line between two constellation points, first constellation point and the second constellation point are respectively provided with the first bit value and the second ratio
Paricular value；
Determine the constellation point for receiving symbol mapping comprising bit to be demodulated in the corresponding Gray of the bit to be demodulated
Affiliated subregion on constellation complex plane；
Calculate the star that the reception symbol comprising bit to be demodulated is mapped to the reception symbol on Gray's constellation complex plane
The vertical range of the corresponding perpendicular bisector of affiliated subregion of seat point, using the distance as the soft bit values of bit to be demodulated；Work as institute
When stating the receptions symbol comprising bit to be demodulated and being located at one side of the perpendicular bisector comprising the first bit value, which is just
Value, when the reception symbol comprising bit to be demodulated, which is located at perpendicular bisector, includes the one side of the second bit value, the soft bit
It is worth for negative value.
Preferably, the method further includes：When Gray's constellation complex plane is there are during multiple subregions, by subregion it is corresponding in hang down
Line is identical and the subregion identical apart from calculating formula of constellation point to perpendicular bisector in subregion merges into same subregion.
Preferably, the method further includes：When Gray's constellation complex plane is there are during multiple subregions, by subregion it is corresponding in hang down
Two parallel subregions of line merge into a subregion, alternatively, by the soft bit values calculated to the corresponding perpendicular bisector of subregion
Two identical subregions of symbol merge into a subregion.
Preferably, when carrying out 128 rank quadrature amplitude modulation, the reception symbol for including bit to be demodulated that calculates arrives
The vertical range for the corresponding perpendicular bisector of the affiliated subregion of constellation point that the reception symbol maps on Gray's constellation complex plane, by this away from
It is specially from the soft bit values as bit to be demodulated：
It is when bit to be demodulated is receives the first bit of symbol, the real part for receiving symbol is to be demodulated as this
Bit soft bit values；When bit to be demodulated is receives the second bit of symbol, the imaginary part of symbol will be received
The soft bit values of the bit to be demodulated as this.
Preferably, if the half of distance is D between two adjacent constellation points, the real part r of symbol is receivedx=real (r),
Imaginary part is ry=imag (r), then the scope of each subregion is determined according to table 1 below on Gray's constellation complex plane：
Wherein：B in table 13~b7Represent the 3rd to the 7th bit, symbol " ＆ " in table 1, "；" expression " and " relation,
"None" represents that the subregion is not present in corresponding bit in table 1；
Calculate the star that the reception symbol comprising bit to be demodulated is mapped to the reception symbol on Gray's constellation complex plane
The vertical range of the corresponding perpendicular bisector of subregion, is specially to press using the distance as the soft bit values of bit to be demodulated belonging to seat point
It is calculated according to the formula shown in table 2 below：
Wherein：B in table 23~b7Represent the 3rd to the 7th bit, "None" represents that corresponding bit is not present in table 2
Subregion soft bit calculating formula corresponding with the subregion.
Present invention also provides a kind of quadrature amplitudes to adjust soft bit demodulating equipment.The device includes：Divide belonging to constellation point
Area's determination unit receives the affiliated subregion determination unit of symbol and soft bit demodulating unit, wherein：
The subregion determination unit, for determining each constellation on the corresponding Gray's constellation complex plane of bit to be demodulated
The affiliated subregion of point, each subregion correspond to a perpendicular bisector, and the perpendicular bisector presets reception symbol most for one for distance in subregion
The perpendicular bisector of line between near the first constellation point and the second constellation point, first constellation point and the second constellation point are respectively provided with
First bit value and the second bit value；
The reception affiliated subregion determination unit of symbol, for determining to receive what symbol mapped comprising bit to be demodulated
Affiliated subregion of the constellation point on the corresponding Gray's constellation complex plane of the bit to be demodulated；
The soft bit demodulating unit, for calculating the reception symbol comprising bit to be demodulated to the reception symbol in lattice
The vertical range of the corresponding perpendicular bisector of affiliated subregion of the constellation point mapped on thunder constellation complex plane, using the distance as to be demodulated
The soft bit values of bit；The one of the first bit value is included when the reception symbol comprising bit to be demodulated is located at perpendicular bisector
During side, which is positive value, and the second bit is included when the reception symbol comprising bit to be demodulated is located at perpendicular bisector
During the one side of value, which is negative value.
Preferably, described device includes subregion division unit, for, there are during multiple subregions, being incited somebody to action in Gray's constellation complex plane
The corresponding perpendicular bisector of subregion is identical and the subregion identical apart from calculating formula of constellation point to perpendicular bisector in subregion be divided into it is same
Subregion.
Preferably, described device further includes subregion combining unit, in Gray's constellation complex plane there are during multiple subregions,
Two parallel subregions of the corresponding perpendicular bisector of subregion are merged into a subregion, are calculated alternatively, the corresponding perpendicular bisector of subregion will be arrived
Two subregions that the symbol of soft bit values out is identical merge into a subregion.
The embodiment of the present application in advance carries out bit to be demodulated corresponding Gray's constellation complex plane subregion subregion correspondence
One perpendicular bisector, then the reception symbol of bit to be demodulated is calculated to the distance of perpendicular bisector as the big of the soft bit demodulated
It is small, reception symbol is determined to the sign of soft bit size in different subregions.Compared with prior art, the embodiment of the present application without
The distance for receiving symbol to all constellation points need to be calculated, and only calculates and receives symbol to the distance of perpendicular bisector, calculation process process
Simply, operand reduces, so as to improve the efficiency of demodulation soft bit information.
Description of the drawings
It in order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments described in application, for those of ordinary skill in the art, without creative efforts,
It can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the flow chart of the quadrature amplitude modulation soft bit demodulation method embodiment of the application；
The subregion that Fig. 2 is the application simplifies merging schematic diagram；
Fig. 3 is the gray mappings planisphere of 128 rank quadrature amplitude modulations；
Fig. 4 (a)~(g) is the b of 128 rank quadrature amplitude modulations1~b7The subregion division schematic diagram of bit；
Fig. 5 is the structure diagram of the quadrature amplitude modulation soft bit demodulating equipment embodiment of the application.
Specific embodiment
It is in order to make those skilled in the art better understand the technical solutions in the application, real below in conjunction with the application
The attached drawing in example is applied, the technical solution in the embodiment of the present application is clearly and completely described, it is clear that described implementation
Example is merely a part but not all of the embodiments of the present application.Based on the embodiment in the application, this field is common
Technical staff's all other embodiments obtained without making creative work should all belong to the application protection
Scope.
Referring to Fig. 1, the figure shows the streams of one embodiment of the quadrature amplitude modulation soft bit demodulation method of the application
Journey.The flow includes：
Step S101：It is predefined on the corresponding Gray's constellation complex plane of bit to be demodulated belonging to each constellation point
Subregion, each subregion correspond to a perpendicular bisector, and the perpendicular bisector presets receive symbol recently first for one for distance in subregion
The perpendicular bisector of line between constellation point and the second constellation point, first constellation point and the second constellation point are respectively provided with the first bit
Value and the second bit value；
Before the calculating of soft bit values is carried out, the embodiment of the present application predefines the constellation point on Gray's constellation complex plane
Affiliated subregion, since the corresponding Gray's constellation complex plane of different bits of identical reception symbol may be different, each
Subregion division to Gray's constellation complex plane is all corresponding with bit to be demodulated.Gray's constellation complex plane is divided
The rule in area is to find the default symbol that receives of distance one on complex plane (to note：Be different from it is subsequent actually receive include treat
The reception symbol of bit is demodulated, which is the reception symbol to carry out subregion any position illusion in subregion
Number) the nearest constellation point with the first bit value (for example, " 0 ") and the constellation point with the second bit value (for example, " 1 "),
Then the two constellation points are connected, using the perpendicular bisector of two constellation point lines as the foundation of division subregion.Under normal conditions,
Marking off the subregion come may have multiple, and to simplify computing, the application preferably carries out certain merging and letter to these subregions
Change.Merging and simplification can provide the specific mode of the following two kinds here there are many specific implementation：
One of mode：Will should be divided into two subregions according to above-mentioned steps when dividing subregion is divided into one point
Area.The rule that this mode merges subregion is to judge whether to occur identical perpendicular bisector (hard decision line) on a complex plane and have
Identical soft output calculating formula (calculate receive symbol to perpendicular bisector range formula it is identical), if identical, will originally according to
Two subregions, which should be divided into, according to perpendicular bisector is divided into a subregion.For example, referring to two reception symbols of r1, r2 in Fig. 2, root
It is L1 that the perpendicular bisector come is marked off according to both of the aforesaid step, identical in the formula for calculating the distance for arriving the perpendicular bisector, so i.e.
A subregion can be considered as by next subregion is marked off according to the two reception symbols.
The two of mode：After subregion has divided, according to certain rule to marked off come multiple subregions simplify.
The rule for simplifying subregion can be the relation investigated between different perpendicular bisectors, can also investigate what different perpendicular bisectors calculated
The symbol of soft bit values.For the former, if two perpendicular bisectors are mutually parallel, the two perpendicular bisectors can be marked off to what is come
Subregion merges into a subregion.For example, two reception symbols of r1, r3 in Fig. 2, the corresponding perpendicular bisectors of r1 are L1, during r3 is corresponding
Vertical line is L2, and two parallel, is merged into a subregion.For the latter, if the symbol of the soft bit values calculated is equal
A subregion is merged into for the two perpendicular bisectors just or be negative, then can be marked off to the subregion come.For example, r4 in Fig. 2,
The reception symbols of r5 two, their perpendicular bisector are respectively L4, L3, the two receive symbols in the 1 of two perpendicular bisectors this one side,
That is the symbol of soft bit values is that just, therefore, can be merged into a subregion.
Step S102：Determine the constellation point for receiving symbol mapping comprising bit to be demodulated in the bit pair to be demodulated
The affiliated subregion on Gray's constellation complex plane answered；
Step S103：Reception symbol of the calculating comprising bit to be demodulated is to the reception symbol on Gray's constellation complex plane
The vertical range of the corresponding perpendicular bisector of affiliated subregion of the constellation point of mapping, using the distance as the soft bit of bit to be demodulated
Value；When the reception symbol comprising bit to be demodulated, which is located at perpendicular bisector, includes the one side of the first bit value, the soft bit
It is worth for positive value, it, should when the reception symbol comprising bit to be demodulated, which is located at perpendicular bisector, includes the one side of the second bit value
Soft bit values are negative value.
The present embodiment determines two constellation points on the corresponding Gray's constellation complex plane of bit to be demodulated, then basis
Two constellation points carry out complex planes and carry out subregions, then calculate bit to be demodulated receive symbol to the distance of perpendicular bisector as solving
Reception symbol is determined the sign of soft bit size by the size of the soft bit recalled in different subregions.With prior art phase
Than, the present embodiment only calculates the distance for receiving symbol to perpendicular bisector without calculating the distance for receiving symbol to all constellation points,
Calculation process process is simple, and operand reduces, so as to improve the efficiency of demodulation soft bit information.
In order to clearly demonstrate the technical solution of the application, below with one more specifically example illustrated.Referring to
Fig. 3, the figure shows Gray's planisphere of the quadrature amplitude modulation of 128 ranks (full bit), each point on the planisphere
A possible reception symbol is represented, each symbol that receives includes 7 bits：b1、b2、b3、b4、b5、b6、b7.It obtains each soft
The process of the demodulation result of bit mainly includes three steps：
The first step：Judge to receive the subregion where symbol；
Second step：The distance for receiving symbol to the perpendicular bisector in the region is calculated, using the distance as the size of soft bit；
3rd step：When reception symbol is located at ' 1 ' side of perpendicular bisector, the symbol of soft bit size is just, positioned at perpendicular bisector
' 0 ' side when, the symbol of soft bit size is negative.
For the b in 128QAM1For bit, marked off according to the above-mentioned first step shown in the subregion such as Fig. 4 (a) come, by
In b1Corresponding two subregions are located at the left and right of the complex plane imaginary axis, and therefore, the imaginary axis is perpendicular bisector, in this case, calculate
Receiving the distance of symbol to perpendicular bisector can be simplified：Using the soft bit of the real part for the receiving symbol bit to be demodulated as this
Value.
For the b in 128QAM2For bit, marked off according to the above-mentioned first step shown in the subregion such as Fig. 4 (b) come, by
In b2Corresponding two subregions are located at the upper and lower of complex plane real axis, and therefore, real axis is perpendicular bisector, in this case, calculate
Receiving the distance of symbol to perpendicular bisector can also be simplified：Using the soft ratio of the imaginary part for the receiving symbol bit to be demodulated as this
Paricular value.
For the b in 128QAM3~b7For bit, subregion such as Fig. 4 (c)~4 come are marked off according to the above-mentioned first step
(g) shown in.Assuming that the half of distance is D between two adjacent constellation points in Gray's planisphere, the complex symbol of reception is r, is made
rx=real (r), ry=tmag (r) respectively receives symbol real and imaginary parts, on this basis, b3~b7Soft bit values
The correspondence of calculation formula and subregion is as shown in the table.
Wherein：B in table 13~b7Represent the 3rd to the 7th bit, symbol " ＆ " in table 1, "；" expression " and " relation,
"None" represents that the subregion is not present in corresponding bit in table 1.
Wherein：B in table 23~b7Represent the 3rd to the 7th bit, "None" represents that corresponding bit is not present in table 2
Subregion soft bit calculating formula corresponding with the subregion.
It should be noted that：In the planisphere of Gray code mapping, b3、b4、b5、b6、b7Corresponding distribution is on coordinate
Axis is full symmetric, therefore, can will be transformed into first by asking for the absolute value in actual situation portion in the reception symbol of other quadrants
Quadrant is calculated, and is calculated so as to simplify, and reduces workload.
The above describes the embodiment of the method for the quadrature amplitude modulation soft bit demodulation of the application in detail.Accordingly,
Present invention also provides quadrature amplitudes to adjust soft bit demodulating equipment embodiment.Referring to Fig. 5, the figure shows quadrature amplitude adjustment
The composition structure of soft bit demodulating equipment embodiment.The device includes：The affiliated subregion determination unit 501 of constellation point receives symbol
Affiliated subregion determination unit 502 and soft bit demodulating unit 503, wherein：
The affiliated subregion determination unit 501 of constellation point, for true on the corresponding Gray's constellation complex plane of bit to be demodulated
The affiliated subregion of fixed each constellation point, each subregion correspond to a perpendicular bisector, and the perpendicular bisector is default for distance in subregion one
Receive the perpendicular bisector of line between symbol nearest the first constellation point and the second constellation point, first constellation point and the second constellation
Point is respectively provided with the first bit value and the second bit value；
The affiliated subregion determination unit 502 of symbol is received, for determining to receive what symbol mapped comprising bit to be demodulated
Affiliated subregion of the constellation point on the corresponding Gray's constellation complex plane of the bit to be demodulated；
Soft bit demodulating unit 503, for calculating the reception symbol comprising bit to be demodulated to the reception symbol in lattice
The vertical range of the corresponding perpendicular bisector of affiliated subregion of the constellation point mapped on thunder constellation complex plane, using the distance as to be demodulated
The soft bit values of bit；The one of the first bit value is included when the reception symbol comprising bit to be demodulated is located at perpendicular bisector
During side, which is positive value, and the second bit is included when the reception symbol comprising bit to be demodulated is located at perpendicular bisector
During the one side of value, which is negative value.
In above device embodiment, in order to simplify computing, simplification can be merged to subregion, this merging simplification can
To be carried out when delimiting subregion in advance, the multiple subregions for meeting certain condition can also be closed after subregion marks off
And.Under the former situation, the preferred described device of the application includes subregion division unit 504, for being deposited in Gray's constellation complex plane
In multiple subregions, by the corresponding perpendicular bisector of subregion is identical and subregion in constellation point it is identical apart from calculating formula to perpendicular bisector
Subregion is divided into same subregion.In the later case, the preferred described device of the application further includes subregion combining unit 505, uses
In Gray's constellation complex plane there are during multiple subregions, two parallel subregions of the corresponding perpendicular bisector of subregion are merged into one point
Area, alternatively, two identical subregions of the symbol of the soft bit values calculated to the corresponding perpendicular bisector of subregion are merged into one
Subregion.
It should be noted that：For the simplicity of narration, above-described embodiment of this specification and the various modifications of embodiment
What realization method stressed is all the difference with other embodiment or mode of texturing, identical similar between each situation
Just to refer each other for part.For several improved procedures of device embodiment, since it is substantially similar to method reality
Example is applied, so describing fairly simple, the relevent part can refer to the partial explaination of embodiments of method.Device described above
The each unit of embodiment may or may not be it is physically separate, can be located at a place or or
It is distributed under multiple network environments.In actual application, part therein or complete can be selected according to the actual needs
Portion's unit realizes the purpose of this embodiment scheme, those of ordinary skill in the art without creative efforts,
It can understand and implement.
The above is only the specific embodiment of the application, it is noted that for the ordinary skill people of the art
For member, on the premise of the application principle is not departed from, several improvements and modifications can also be made, these improvements and modifications also should
It is considered as the protection domain of the application.
Claims (8)
1. a kind of quadrature amplitude modulation soft bit demodulation method, which is characterized in that this method includes：
The affiliated subregion of each constellation point, each subregion are predefined on the corresponding Gray's constellation complex plane of bit to be demodulated
A corresponding perpendicular bisector, the perpendicular bisector are the first nearest constellation point of one default reception symbol of distance in subregion and the second star
The perpendicular bisector of line, foundation of the perpendicular bisector as division subregion, first constellation point and the second constellation point between seat point
It is respectively provided with the first bit value and the second bit value；
Determine the constellation point for receiving symbol mapping comprising bit to be demodulated in the corresponding Gray's constellation of the bit to be demodulated
Affiliated subregion on complex plane；
Calculate the constellation point that the reception symbol comprising bit to be demodulated is mapped to the reception symbol on Gray's constellation complex plane
The corresponding perpendicular bisector of affiliated subregion vertical range, using the distance as the soft bit values of bit to be demodulated；When the bag
When reception symbol containing bit to be demodulated is located at one side of the perpendicular bisector comprising the first bit value, which is positive value, when
When the reception symbol comprising bit to be demodulated is located at one side of the perpendicular bisector comprising the second bit value, which is negative
Value.
2. according to the method described in claim 1, it is characterized in that, the described method includes：When Gray's constellation complex plane is in the presence of more
During a subregion, by the corresponding perpendicular bisector of subregion is identical and subregion in constellation point to perpendicular bisector the subregion identical apart from calculating formula
Merge into same subregion.
3. according to the method described in claim 1, it is characterized in that, the method further includes：When Gray's constellation complex plane exists
During multiple subregions, two parallel subregions of the corresponding perpendicular bisector of subregion are merged into a subregion, alternatively, it is corresponding to arrive subregion
Two subregions that the symbol for the soft bit values that perpendicular bisector calculates is identical merge into a subregion.
4. according to the method described in claim 1, it is characterized in that, when carrying out 128 rank quadrature amplitude modulation, calculate to include and treat
Demodulate bit receives symbol to the vertical range of perpendicular bisector, and the distance is specific as the soft bit values of bit to be demodulated
For：
When bit to be demodulated is receives the first bit of symbol, using the ratio that the real part for receiving symbol is to be demodulated as this
The soft bit values of special position；When bit to be demodulated is receives the second bit of symbol, will receive the imaginary part of symbol as
The soft bit values of the bit to be demodulated.
If 5. according to the method described in claim 1, it is characterized in that, between two adjacent constellation points the half of distance for D,
Receive the real part r of symbolx=real (r), imaginary part ry=imag (r), then on Gray's constellation complex plane each subregion scope root
It is determined according to table 1 below：
Wherein：B in table 13~b7Represent the 3rd to the 7th bit, symbol " ＆ " in table 1, "；" expression " and " relation, table 1
Middle "None" represents that the subregion is not present in corresponding bit；
It calculates and receives symbol to the vertical range of perpendicular bisector comprising bit to be demodulated, using the distance as bit to be demodulated
Soft bit values be specially according to shown in table 2 below formula calculate：
Wherein：B in table 23~b7Represent the 3rd to the 7th bit, "None" represents that this point is not present in corresponding bit in table 2
Area's soft bit calculating formula corresponding with the subregion.
6. a kind of quadrature amplitude adjusts soft bit demodulating equipment, which is characterized in that the device includes：The affiliated subregion of constellation point determines
Unit receives the affiliated subregion determination unit of symbol and soft bit demodulating unit, wherein：
The constellation point determination unit, for determining each constellation point on the corresponding Gray's constellation complex plane of bit to be demodulated
Affiliated subregion, each subregion corresponds to a perpendicular bisector, and default to receive symbol nearest for distance in subregion one for the perpendicular bisector
The first constellation point and the second constellation point between line perpendicular bisector, foundation of the perpendicular bisector as division subregion, described the
One constellation point and the second constellation point are respectively provided with the first bit value and the second bit value；
The reception affiliated subregion determination unit of symbol, for determining the constellation for receiving symbol mapping comprising bit to be demodulated
Affiliated subregion of the point on the corresponding Gray's constellation complex plane of the bit to be demodulated；
The soft bit demodulating unit, for calculating the reception symbol comprising bit to be demodulated to the reception symbol in Gray's star
The vertical range of the corresponding perpendicular bisector of affiliated subregion of the constellation point mapped on seat complex plane, using the distance as bit to be demodulated
The soft bit values of position；When the reception symbol comprising bit to be demodulated is located at the one side that perpendicular bisector includes the first bit value
When, which is positive value, and the second bit value is included when the reception symbol comprising bit to be demodulated is located at perpendicular bisector
One side when, the soft bit values be negative value.
7. device according to claim 6, which is characterized in that described device includes subregion division unit, in Gray
Constellation complex plane there are during multiple subregions, by the corresponding perpendicular bisector of subregion is identical and subregion in constellation point to perpendicular bisector distance
The identical subregion of calculating formula is divided into same subregion.
8. device according to claim 6, which is characterized in that described device further includes subregion combining unit, in lattice
Thunder constellation complex plane there are during multiple subregions, by two parallel subregions of the corresponding perpendicular bisector of subregion merge into a subregion or
Two identical subregions of the symbol of the soft bit values calculated to the corresponding perpendicular bisector of subregion are merged into a subregion by person.
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| CN201310274884.5A CN104283835B (en) | 2013-07-02 | 2013-07-02 | A kind of quadrature amplitude modulation soft bit demodulation method and its device |
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| CN201310274884.5A CN104283835B (en) | 2013-07-02 | 2013-07-02 | A kind of quadrature amplitude modulation soft bit demodulation method and its device |
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| CN106534037B (en) * | 2016-10-31 | 2019-09-03 | 西安烽火电子科技有限责任公司 | A kind of soft demodulating method of high order modulation signal |
| CN109302264B (en) * | 2017-07-24 | 2021-04-02 | 展讯通信（上海）有限公司 | Method, apparatus and computer readable medium for maximum likelihood detection |
| CN109756275B (en) * | 2017-11-03 | 2021-10-15 | 深圳市中兴微电子技术有限公司 | A kind of demodulation method and demodulation device |
| CN110505359B (en) * | 2018-05-18 | 2020-10-23 | 中国科学院上海高等研究院 | Non-uniform modulation and demodulation method, system, medium and terminal in wireless broadcast communication system |
| CN113055330B (en) * | 2018-06-14 | 2023-10-20 | 福建星海通信科技有限公司 | Low-complexity soft decision method based on phase amplitude characteristics |
| CN115242588B (en) * | 2021-04-25 | 2024-04-16 | 大唐移动通信设备有限公司 | Signal demodulation processing method, communication device, and storage medium |
| CN116915570B (en) * | 2023-08-03 | 2023-12-12 | 成都爱瑞无线科技有限公司 | Soft demodulation method and device based on APSK modulation, communication equipment and storage medium |
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