CN102055715A - Soft-decision method and signal receiving system thereof - Google Patents
Soft-decision method and signal receiving system thereof Download PDFInfo
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- CN102055715A CN102055715A CN2009102208766A CN200910220876A CN102055715A CN 102055715 A CN102055715 A CN 102055715A CN 2009102208766 A CN2009102208766 A CN 2009102208766A CN 200910220876 A CN200910220876 A CN 200910220876A CN 102055715 A CN102055715 A CN 102055715A
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Abstract
The invention relates to a soft-decision method and a signal receiving system thereof, and is used for determining a soft-decision coordinate related to a star graph . The soft-decision coordinate comprises a first soft-decision sub-coordinate and a second soft-decision sub-coordinate. The soft-decision method comprises the following steps: receiving an input signal containing a coordinate value; defining a first coordinate scope having a first boundary value and a second boundary value on a coordinate axis of the star graph; acquiring the first soft-decision sub-coordinate according to the first coordinate scope, defining a second coordinate scope having a third boundary value and a fourth boundary value on the coordinate axis of the stellulate diagram, and acquiring the second soft-decision sub-coordinate according to the first coordinate scope, wherein the first and third boundary values and the second and fourth boundary values are not the same at the same time.
Description
Technical field
Data processing method in the relevant communication system of the present invention is particularly relevant for a kind of soft decision method of communication system inverse mapping.
Background technology
Fig. 1 is the functional block diagram of existing receiving system 10, comprises signal reductor 140, inverse mapping device (demapper) 160 and decoder 180.Inverse mapping device 160 comprises mapping function corresponding intrument 164 and quantizer 167.
Signal reductor 140 receiving inputted signals also will be originally convert one group of in-phase signal corresponding to frequency domain (inphase signal is called for short I signal) and orthogonal signalling (quadrature signal is called for short Q signal) to corresponding to the input signal of time domain.Inverse mapping device 160 is according to the numerical data of star-plot (constellation) generation that is applied to input signal corresponding to I and Q signal.For example, move key (binary phase shift keying corresponding to two-phase, BPSK), four phase shift keys (quadrature phase shift keying, QPSK), 16 quadrature amplitude modulation (16quadrature amplitude modulation, 16QAM) and the star-plot of the modulation system of 64QAM have nothing in common with each other, therefore, pairing I of numerical data and Q signal also are not quite similar.At last, decoder 180 converts the digital data into dateout.
In theory, I that produced in the receiving system 10 and Q signal should be accurately corresponding to two integers of the Gray code on the star-plot (Gray code).Gray code is a kind of coded system, and it is an ordered series of numbers set, and each number uses binary system to represent, has only a place value difference between any two numbers.Yet, owing to may being subjected to I and Q signal that interference of noise makes that signal reductor 140 produced, receiving system 10 handled signals are not integer, that is, I and Q signal may be exactly corresponding to the arbitrary Gray codes on the star-plot, therefore need with other method the I of non-integer kenel and Q signal corresponding to a Gray code again.
Soft-decision (soft decision) mode is one of solution to the problems described above.Fig. 2 is existing 64QAM star-plot.Wherein abscissa is represented I signal, and ordinate is represented Q signal, and the every bit on the star-plot is all corresponding to one 6 value (0～2
6-1), wherein front three is represented the I part, represents the Q part for back three.If receiving system 10 uses the modulation system of 64QAM, (I Q) is mapped as (I for the I that this soft-decision mode can receive inverse mapping device 160 and the coordinate figure of Q signal
0, I
1, I
2, Q
0, Q
1, Q
2) one group of soft-decision coordinate figure.For example, the I coordinate figure is 5.3, corresponds to (I by mapping function to installing 164
0*, I
1*, I
2*)=(5.3 ,-1.3,0.7), the mapping function of its foundation is as follows:
Be subject to the memory of hardware, the real work upward needs smallest number is turned to the acceptable number range of hardware, so pass through quantizer 167 with (I
0*, I
1*, I
2*)=(5.3 ,-1.3,0.7) be quantified as (I as shown in Figure 2
0, I
1, I
2)=(3 ,-2,2), with (I originally
0*, I
1*, I
2*)=(5.3 ,-1.3,0.7) widely different.Existing soft-decision mode is with the I on the star-plot
0, I
1And I
2All be divided into N five equilibrium (N=8 among Fig. 2), and do not consider I
0, I
1And I
2Three's scope difference is promptly worked as I
0The decision on the occasion of or negative value after, I
1Four corner have only I
0Half of four corner, that is, I
1Four corner have only I
0On the occasion of interval or negative value interval; In like manner, work as I
1The decision on the occasion of or negative value after, I
2Four corner have only I
1Half of four corner.More particularly, I
0=4 and I
1The absolute growth of the indivedual initial points of=4 both distances is also inequality.In fact, as shown in Figure 2, I
1=4 absolute growths apart from its initial point have only I
0=4 apart from half of the absolute growth of its initial point.Therefore, if the three is divided into the N five equilibrium, distortion in the time of can causing quantizing and influence the judgement of decoder, thereby cause coding gain (coding gain) to reduce, and understand because of the position that can't accurately correct mistakes, and the raising bit error rate (bit error rate, BER).Therefore a kind of preferable soft decision method of very ardent needs reaches relevant receiving system, to increase coding gain and to reduce bit error rate.
Summary of the invention
One of purpose of the present invention is to provide a kind of soft decision method to reach relevant receiving system to increase coding gain and to reduce bit error rate.
The present invention proposes a kind of soft decision method, be relevant to a soft-decision coordinate of a star-plot in order to decision, this soft-decision coordinate comprises one first soft-decision subcoordinate and one second soft-decision subcoordinate, and this soft decision method comprises: receive an input signal, comprise a coordinate figure; Reference axis in this star-plot defines one first coordinate range, and this first coordinate range has a first boundary value and one second boundary value; Obtain this first soft-decision subcoordinate according to this first coordinate range; This reference axis in this star-plot defines one second coordinate range, and this second coordinate range has one the 3rd boundary value and one the 4th boundary value; And obtain this second soft-decision subcoordinate according to this second coordinate range; Wherein this first boundary value does not equate with the 4th boundary value system simultaneously with the 3rd boundary value and this second boundary value.
The present invention also proposes a kind of soft decision method, be relevant to a soft-decision coordinate of a star-plot in order to decision, this soft-decision coordinate comprises one first soft-decision subcoordinate and one second soft-decision subcoordinate, and this soft decision method comprises: receive an input signal, comprise a coordinate figure; Reference axis in this star-plot defines one first coordinate range, makes it have first section of a plurality of identical sizes; Obtain this first soft-decision subcoordinate according to these first sections; Part according to these first sections defines one second coordinate range, makes it have second section of a plurality of identical sizes; And obtain this second soft-decision subcoordinate according to these second sections; Wherein the size of this first section system equals the size of this second section substantially.
The present invention also proposes a kind of receiving system, comprising: a signal reductor, and in order to receiving an input signal, and in order to this input signal is converted to a coordinate figure; One inverse mapping device, be coupled to this signal reductor, in order to being a soft-decision coordinate with this coordinate figure inverse mapping, this soft-decision coordinate comprises one first soft-decision subcoordinate and one second soft-decision subcoordinate, this first soft-decision coordinate has one first, 1 second boundary value, this second soft-decision coordinate has one the 3rd, 1 the 4th boundary value, and wherein this first boundary value does not equate with the 4th boundary value system simultaneously with the 3rd boundary value and this second boundary value; And a decoder, be coupled to this inverse mapping device, in order to this soft-decision coordinate of decoding to export a dateout.
Soft decision method that the present invention proposes and relevant receiving system can improve when signal is subjected to noise jamming, and the erroneous judgement of receiving system is disconnected, to increase coding gain and to reduce bit error rate.
Description of drawings
In order to enable further to understand feature of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet accompanying drawing only provide with reference to and explanation, be not to be used for the present invention is limited, wherein:
Fig. 1 is the functional block diagram of existing receiving system.
Fig. 2 is existing 64QAM star-plot.
Fig. 3 is the 64QAM star-plot according to one embodiment of the invention illustrated.
Fig. 4 is the functional block diagram according to the receiving system that one embodiment of the invention illustrated.
Fig. 5 is the functional block diagram according to the inverse mapping device that one embodiment of the invention illustrated.
Fig. 6 is the 64QAM star-plot according to one embodiment of the invention illustrated.
Fig. 7 is the functional block diagram of the inverse mapping device that illustrated according to another embodiment of the present invention.
Fig. 8 is the quantization function figure according to one embodiment of the invention illustrated.
Fig. 9 is the functional block diagram of the inverse mapping device that illustrated according to another embodiment of the present invention.
Figure 10 is the soft decision method flow chart according to one embodiment of the invention illustrated.
The soft decision method flow chart of Figure 11 for being illustrated according to another embodiment of the present invention.
Embodiment
Fig. 3 is the 64QAM star-plot according to one embodiment of the invention illustrated.Fig. 4 comprises: signal reductor 440, inverse mapping device 460 and decoder 480 for according to receiving system 40 functional block diagram that one embodiment of the invention illustrated.Signal reductor 440 receives an input signal, and in order to this input signal is converted to the 5.3+4.5j of signal more than, these many signals can be represented a coordinate figure, promptly can be considered the coordinate (5.3 on the star-plot in Fig. 3,4.5), wherein 5.3 is the I coordinate figure, 4.5 is the Q coordinate figure.
In the present embodiment, the I reference axis of the star-plot of Fig. 3 is defined as having eight equal-sized sections, is numbered-4 to 4, then I
0The scope of coordinate is-4 to 4, that is-4 and 4 is I
0The boundary value of coordinate; If with I
0The scope of coordinate is made as 0 to 8, and then be I this moment 0 and 8
0The boundary value of coordinate; In like manner, scope also can be made as-8 to 0, at this moment-8 and 0 be I
0The boundary value of coordinate.Visual performance requirements of above-mentioned coordinate range and hardware cost are made by oneself by the user, and the coordinate range big bit error rate of healing is healed low but hardware cost is also higher.
Because I
0Coordinate is defined as eight equal parts with the I reference axis, in order to make I
0The absolute figure of coordinate and I
1The absolute figure of coordinate can react significance level separately, so I
1Coordinate is with corresponding I
0Coordinate on the occasion of part, just number 1 to 4 section, be defined as four equal-sized sections, in like manner, also with corresponding I
0The negative loop of coordinate, just the section of numbering-1 to-4 be defined as four equal-sized sections, so the result just becomes I
0Coordinate and I
1The section length of coordinate equates.That is to say I
1The scope of whole quarterings of coordinate is I
0Half of the four corner of coordinate, that is, I
0-4 to-1 and 4 to 1 of coordinate all corresponds to I
1Therefore-2 to 2 of coordinate can learn I
1The boundary value of coordinate is-2 and 2.In like manner, boundary value can be 0 and 4 or-4 and 0.As from the foregoing, I
0Two boundary values and the I of coordinate
1Two boundary values of coordinate can not equate simultaneously.
Fig. 5 comprises mapping function corresponding intrument 461 and multiplier 462 for the functional block diagram according to the inverse mapping device 460 that one embodiment of the invention illustrated.Mapping function corresponding intrument 461 is coupled to signal reductor 440, comprises mapping function corresponding unit 4612,4614 and 4616.Mapping function corresponding unit 4612,4614 and 4616 also comprises a quantifying unit (not icon) separately.
Below lifting the I coordinate is example, and the Q coordinate in like manner.Please also refer to Fig. 6, Fig. 6 is the 64QAM star-plot according to one embodiment of the invention illustrated.Mapping function corresponding unit 4612,4614 and 4616 receives the I coordinate figure, and according to following mapping function the I coordinate figure is mapped as I
0*, I
1* reach I
2* coordinate:
For example, coordinate figure I=5.3 is mapped to another coordinate system (I
0*, I
1*, I
2*)=(5.3 ,-1.3,0.7).Quantizer in the mapping function corresponding unit 4612,4614 and 4616 is also separately according to first, second and third step pitch, and it is 1,1/2 and 1/4 I that the I axle is defined as unit length respectively
0', I
1' and I
2' coordinate.Then can be by quantizer with (I
0*, I
1*, I
2*)=(5.3 ,-1.3,0.7) be quantified as 6 (I respectively
0' coordinate) ,-3 (I
1' coordinate) and 3 (I
2' coordinate).Among this embodiment, first, second and third step pitch is respectively 1,1/2 and 1/4.
In another preferred embodiment, with reference to figure 6, first, second and third step pitch all is made as 1, that is, the I axle is defined as unit length is 1 I
0', I
1' and I
2' coordinate, then can be by quantizer with (I
0*, I
1*, I
2*)=(5.3 ,-1.3,0.7) be quantified as 6 (I respectively
0' coordinate) ,-2 (I
1' coordinate) and 1 (I
2' coordinate).And k
0, k
1And k
2All be made as 1/2, with I
0' (6), I
1' (2) and I
2' coordinate (1) is multiplied by k respectively
0, k
1And k
2Can get I after the quantification
0, I
1And I
2Coordinate also is respectively 3 ,-1 and 1.As from the foregoing, first, second and third step pitch is all identical, or first, second and third coefficient is all unequal all can obtain identical result.
Fig. 7 comprises mapping function corresponding intrument 464, multiplier 465 and quantizer 467 for the functional block diagram of the inverse mapping device 460 that illustrated according to another embodiment of the present invention.Mapping function corresponding intrument 464 is coupled to signal reductor 440, comprises mapping function corresponding unit 4642,4644 and 4646, and mapping function corresponding unit 4642,4644 and 4646 receives the I coordinate figure, and according to a mapping function, respectively the I coordinate figure is mapped as I
0*, I
1* reach I
2* coordinate.
For example, coordinate figure I=5.3, mapping function corresponding unit 4642,4644 and 4646 is as follows according to mapping function:
Coordinate figure I=5.3 is mapped as I respectively
0*=5.3, I
1And I *=-1.3
1*=0.7.
Fig. 8 is the quantization function figure according to one embodiment of the invention illustrated.In another preferred embodiment, with reference to figure 8, k
0, k
1And k
2Be made as 1/2,1 and 2 respectively, then with I
0* (5.3), I
1* coordinate (1.3) and I
2* (0.7) coordinate is multiplied by k respectively
0, k
1And k
2After can get I
0', I
1' and I
2' coordinate is respectively 2.65 ,-1.3 and 1.4, and first, second and third step pitch is made as 1,2 and 4 respectively, that is, will quantize step pitch to be made as 1,2 and 4, can get I after quantizing by quantizer 467
0, I
1And I
2Coordinate also is respectively 3 ,-1 and 1.As from the foregoing, first, second and third step pitch is all identical, or first, second and third coefficient is all unequal all can to obtain identical result.
Figure 10 is the soft decision method flow chart according to one embodiment of the invention illustrated.Step 1010 receives an input signal.Step 1020 has first coordinate range of first and second boundary value in a reference axis of star-plot definition one.Step 1040 obtains this first soft-decision subcoordinate according to this first coordinate range and (for example is I
0).Step 1060 has second coordinate range of the 3rd and the 4th boundary value in this reference axis definition one of this star-plot.Step 1080 obtains this second soft-decision subcoordinate according to this second coordinate range and (for example is I
1).Wherein this first boundary value does not equate with the 4th boundary value simultaneously with the 3rd boundary value and this second boundary value.
Present embodiment can apply to two-phase and move key, four phase shift keys or 16 quadrature amplitude modulation.When applying to 64QAM, can repeat above-mentioned steps, for example, with reference to figure 3, coordinate figure I=5.3 can get I by Fig. 3
2=1.
In a preferred embodiment, the coordinate figure of input signal can have the coordinate boundary value, can be during owing to the actual reception signal because of noise effect, and the scope of input signal may be very big, for fear of influencing result of calculation and reducing hardware cost, coordinate range is limited to one the 5th and one hexagon dividing value.For example, with the 5th and the hexagon dividing value be made as-8 and 8 respectively, when input signal is considered as 8 greater than 8 the time, and be considered as-8 less than-8 o'clock, for example be 9.8 o'clock, then be considered as 8 with 9.8.
From the above, among Fig. 3, the scope of I coordinate figure can be considered-8 (the 5th boundary values) to 8 (hexagon dividing values).With reference to figure 3, the I axle is defined as has eight equal-sized sections, be numbered-4 to 4, then I
0The scope of coordinate is-4 to 4, that is-4 and 4 is I
0The boundary value of coordinate.Therefore with 4 divided by 8 or-4 divided by the 8 coefficient (k for example that can win
0) be 1/2 or-1/2, that is, first and second boundary value system by with the 5th and the hexagon dividing value be multiplied by first coefficient respectively and produce.In like manner, I
1The 3rd boundary value (2) of coordinate is by the 5th boundary value and hexagon dividing value are multiplied by one second coefficient (2/8=1/4, for example k respectively with the 4th boundary value (2)
1) and produce, as from the foregoing, second coefficient and first coefficient are unequal.
The soft decision method flow chart of Figure 11 for being illustrated according to another embodiment of the present invention.Step 1110 receives an input signal.Step 1120 has first coordinate range of first section of a plurality of identical sizes in a reference axis of this star-plot definition one.Step 1150 obtains this first soft-decision subcoordinate according to these first sections and (for example is I
0).Step 1170 has second coordinate range of second section of a plurality of identical sizes according to the part of these first sections definition one, for example with first coordinate range (I for example
0) coordinate on the occasion of part, just number the section of 1 to 8 section numbering 1 to 4 wherein, be defined as second coordinate range, make it have four equal-sized sections, so the section length that the result just becomes first coordinate range and first coordinate range equates.In like manner, also can be with the negative loop of the first coordinate range coordinate, just the section of numbering-1 to-4 is defined as second coordinate range.Step 1190 obtains this second soft-decision subcoordinate according to these second sections and (for example is I
1).Wherein the size of this first section is the size that equals this second section substantially.
Present embodiment can apply to BPSK, QPSK or 16QAM.When applying to 64QAM, can repeat above-mentioned steps, for example, and with reference to figure 3, coordinate figure I=5.3, two second sections of the definable second coordinate range rightmost are I
2The coordinate range of coordinate, that is 4 to 8 of the I axle scope can get I by Fig. 3 originally
2=1.
In sum, when coordinate figure I=5.3, optimized coordinate figure is (I
0*, I
1*, I
2*)=(5.3 ,-1.3,0.7), present embodiment is mapped as (I with it
0, I
1, I
2)=(3 ,-1,1), yet prior art but is mapped as (I with it
0, I
1, I
2)=(3 ,-2,2), with the error of optimum value greater than present embodiment, thereby increase the disconnected probability of encoder erroneous judgement.Therefore, soft decision method and coherent signal receiving system thereof that the present invention proposes can be improved when signal is subjected to noise jamming, and the erroneous judgement of receiving system is disconnected, to increase coding gain and to reduce bit error rate.
In sum, though the present invention with the preferred embodiment exposure as above, yet it is not in order to limit the present invention.Anyly be familiar with present technique person, without departing from the spirit and scope of the present invention, when can doing various changes that are equal to or replacement, protection scope of the present invention is when looking accompanying being as the criterion that the application's claim scope defined.
Claims (14)
1. soft decision method is relevant to a soft-decision coordinate of a star-plot in order to decision, and this soft-decision coordinate comprises one first soft-decision subcoordinate and one second soft-decision subcoordinate, and this soft decision method comprises:
Receive an input signal, comprise a coordinate figure;
Reference axis in this star-plot defines one first coordinate range, and this first coordinate range has a first boundary value and one second boundary value;
Obtain this first soft-decision subcoordinate according to this first coordinate range;
This reference axis in this star-plot defines one second coordinate range, and this second coordinate range has one the 3rd boundary value and one the 4th boundary value; And
Obtain this second soft-decision subcoordinate according to this second coordinate range;
Wherein this first boundary value is not equate simultaneously with the 3rd boundary value and this second boundary value with the 4th boundary value.
2. soft decision method according to claim 1, it is characterized in that, this coordinate figure has one the 5th boundary value and a hexagon dividing value, this first boundary value and this second boundary value are to produce by the 5th boundary value and this hexagon dividing value are multiplied by one first coefficient respectively, and the 3rd boundary value and the 4th boundary value system produces by the 5th boundary value and this hexagon dividing value are multiplied by one second coefficient respectively, and wherein this second coefficient and this first coefficient are unequal.
3. soft decision method according to claim 1 is characterized in that, this reference axis is the I reference axis or the Q reference axis of this star-plot.
4. soft decision method according to claim 1 is characterized in that this method is used for the inverse mapping of BPSK, QPSK, 16QAM or 64QAM.
5. soft decision method is relevant to a soft-decision coordinate of a star-plot in order to decision, and this soft-decision coordinate comprises one first soft-decision subcoordinate and one second soft-decision subcoordinate, and this soft decision method comprises:
Receive an input signal, comprise a coordinate figure;
Reference axis in this star-plot defines one first coordinate range, makes it have first section of a plurality of identical sizes;
Obtain this first soft-decision subcoordinate according to these first sections;
Part according to these first sections defines one second coordinate range, makes it have second section of a plurality of identical sizes; And
Obtain this second soft-decision subcoordinate according to these second sections;
Wherein the size of this first section is the size that equals this second section substantially.
6. soft decision method according to claim 1 is characterized in that, this reference axis is the I reference axis or the Q reference axis of this star-plot.
7. soft decision method according to claim 1 is characterized in that this method is used for the inverse mapping of BPSK, QPSK, 16QAM or 64QAM.
8. receiving system comprises:
One signal reductor, in order to receiving an input signal, and in order to this input signal is converted to a coordinate figure;
One inverse mapping device, be coupled to this signal reductor, in order to being a soft-decision coordinate with this coordinate figure inverse mapping, this soft-decision coordinate comprises one first soft-decision subcoordinate and one second soft-decision subcoordinate, this first soft-decision coordinate has one first and one second boundary value, this second soft-decision coordinate has one the 3rd and one the 4th boundary value, and wherein this first boundary value does not equate with the 4th boundary value system simultaneously with the 3rd boundary value and this second boundary value; And
One decoder is coupled to this inverse mapping device, in order to this soft-decision coordinate of decoding to export a dateout.
9. receiving system according to claim 8 is characterized in that, this inverse mapping device comprises:
One mapping function corresponding intrument, be coupled to this signal reductor, comprise one first and one second mapping function corresponding unit, this first and this second mapping function corresponding unit receive this coordinate figure, according to a mapping function and respectively according to one first and one second step pitch, this coordinate figure is mapped as one first and one second coordinate; And
One multiplier, be coupled to this mapping function corresponding intrument, comprise one first and one second multiplication unit, this first and this second multiplication unit in order to respectively with this first and this second coordinate multiply by one first and one second coefficient with obtain this first and this second soft-decision subcoordinate;
Wherein this first step is apart from equaling this second step pitch, or this first coefficient and this second coefficient are unequal.
10. receiving system according to claim 9, it is characterized in that, this mapping function corresponding intrument also comprises a quantizer, this quantizer comprises one first and one second quantifying unit, be respectively coupled to this first and this second mapping function corresponding unit, in order to according to this first and this second step pitch with obtain this first and this second coordinate.
11. receiving system according to claim 8 is characterized in that, this inverse mapping device comprises:
One mapping function corresponding intrument, be coupled to this signal reductor, comprise one first and one second mapping function corresponding unit, this first and this second mapping function corresponding unit receive this coordinate figure, and, respectively this coordinate figure is mapped as one first and one second coordinate according to a mapping function;
One multiplier is coupled to this mapping function corresponding intrument, comprises one first and one second multiplication unit, this first and this second multiplication unit respectively with this first and this second coordinate multiply by one first and one second coefficient, to obtain one the 3rd and one 4-coordinate; And
One quantizer is coupled to this multiplier, comprises one first and one second quantifying unit, and this first and second quantifying unit is respectively according to one first and one second step pitch, with the 3rd and this 4-coordinate be quantified as this first and this second soft-decision subcoordinate;
Wherein this first step is apart from equaling this second step pitch, or this first coefficient and this second coefficient are unequal.
12. receiving system according to claim 8 is characterized in that, this inverse mapping device comprises:
One mapping function corresponding intrument, be coupled to this signal reductor, comprise one first and one second mapping function corresponding unit, this first and this second mapping function corresponding unit receive this coordinate figure, and, respectively this coordinate figure is mapped as one first and one second coordinate according to a mapping function;
One quantizer is coupled to this mapping function corresponding intrument, comprises one first and one second quantifying unit, and this first and second quantifying unit is respectively according to one first and one second step pitch, respectively with this first and this second coordinate be quantified as one the 3rd and one 4-coordinate; And
One multiplier is coupled to this quantizer, comprises one first and one second multiplication unit, this first and this second multiplication unit in order to respectively with the 3rd and this 4-coordinate multiply by one first and one second coefficient, with obtain this first and this second soft-decision subcoordinate;
Wherein this first step is apart from equaling this second step pitch, or this first coefficient and this second coefficient are unequal.
13. receiving system according to claim 8 is characterized in that, this inverse mapping device is used for the inverse mapping of BPSK, QPSK, 16QAM or 64QAM.
14. receiving system according to claim 8 is characterized in that, this coordinate figure is I coordinate figure or Q coordinate figure.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005011164A1 (en) * | 2003-07-29 | 2005-02-03 | Fujitsu Limited | Reception device in communication system |
| CN1777041A (en) * | 2004-11-19 | 2006-05-24 | 埃沃列姆公司 | Receiver system and method for soft-decision decoding of retracted convolutional codes |
| US20070127605A1 (en) * | 1999-12-02 | 2007-06-07 | Qualcomm Incorporate | Method and Apparatus for Soft Decision Input Metrics To A Turbo Decoder |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070127605A1 (en) * | 1999-12-02 | 2007-06-07 | Qualcomm Incorporate | Method and Apparatus for Soft Decision Input Metrics To A Turbo Decoder |
| WO2005011164A1 (en) * | 2003-07-29 | 2005-02-03 | Fujitsu Limited | Reception device in communication system |
| CN1777041A (en) * | 2004-11-19 | 2006-05-24 | 埃沃列姆公司 | Receiver system and method for soft-decision decoding of retracted convolutional codes |
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