CN102088428A - System and method for processing signals - Google Patents

System and method for processing signals Download PDF

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Publication number
CN102088428A
CN102088428A CN2009102541326A CN200910254132A CN102088428A CN 102088428 A CN102088428 A CN 102088428A CN 2009102541326 A CN2009102541326 A CN 2009102541326A CN 200910254132 A CN200910254132 A CN 200910254132A CN 102088428 A CN102088428 A CN 102088428A
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signal
numerical value
weight
phase error
order
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CN102088428B (en
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魏骏恺
林永欣
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MStar Software R&D Shenzhen Ltd
MStar Semiconductor Inc Taiwan
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MStar Software R&D Shenzhen Ltd
MStar Semiconductor Inc Taiwan
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Abstract

The invention provides a system and method for processing signals. The system provided by the invention comprises a computing device, a signal regulating and corresponding device and a decoder, wherein the computing device is used for receiving a signal and computing one phase error of the signal to generate a weight according to the phase error; the signal regulating and corresponding device coupled to the computing device is used for receiving the signal to generate multiple soft numerical values according the weight and the signal; and the decoder coupled to the signal regulating and corresponding device is used for decoding the soft numerical values to generate data.

Description

Signal processing system and method
Technical field
The invention relates to a kind of signal processing system and method, particularly relevant a kind of phase error according to signal is adjusted signal to promote the signal processing system and the method for decoding usefulness.
Background technology
Fig. 1 comprises: calculation element 120, inverse mapper (demapper) 140 and decoder (decoder) 180 for the functional block diagram of existing signal processing system 10.Calculation element 120 is according to the some of signal, and for example pilot signal (pilot) is calculated phase error theta (phase error) and further produced phasing numerical value e J θ Inverse mapper 140 received signals and according to the phasing numerical value e of calculation element 120 J θ, after the phase place of correction signal again inverse mapping be a plurality of soft numerical value (soft value).Decoder 180 is reduced to data output with these soft numerical value decodings.
Fig. 2 is the functional block diagram of calculation element 120, comprising: phase calculation unit 121,122,123 and 124, adder unit 126, division arithmetic unit 128 and exponent arithmetic unit 129.Phase calculation unit 121,122,123 and 124 receives pilot signal P respectively -21, P -7, P 7And P 21, and calculate P respectively -21, P -7, P 7And P 2IIndividual phase.Adder unit 126 adds up P -21, P -7, P 7And P 21Individual phase, calculate via division arithmetic unit 128 again and obtain phase error theta after average.Then, exponent arithmetic unit 129 produces phasing numerical value e J θCalculation element 120 is that the specification according to IEEE 802.11a/g designs, and its detailed manner of execution is known by the personage who is familiar with this technical field, so repeat no more.
In signal processing system, when signal arrives receiving terminal, can produce phase error because of noise, comprise skew sample time (sampling time offset, STO), carrier frequency shift (carrier frequency offset, CFO), phase noise (phase noise) and sampling clock pulse skew (sampling clock offset, SCO) or the like.Yet, prior art is only included channel effect (channel frequency response) in soft inverse mapper (soft-output demapper), and the unresolved phase error that still is present in the system, so can cause the difficult correct processing signals of signal processing system 10.
Viterbi (Viterbi) decoder 180 receives these soft numerical value to decode the data of transmission.When the signal of receiving has phase error,, then can separate back more accurate data if decoder 180 can be received the message about this phase error.Therefore, very ardent needs development signal processing system and the method that a kind of phase error according to signal is adjusted signal, makes signal processing system that better usefulness can be arranged.
Summary of the invention
One of purpose of the present invention is to provide a kind of phase error according to signal to adjust signal to promote the signal processing system and the method for decoding usefulness, makes signal processing system that better usefulness can be arranged.
The present invention proposes a kind of signal processing system, comprising: calculation element, in order to receiving a signal, and calculate a phase error of this signal and according to this phase error to produce a weight; Signal is adjusted and corresponding intrument, is coupled to this calculation element, in order to receive this signal and to produce a plurality of soft numerical value according to this weight and this signal; And decoder, be coupled to this signal adjustment and corresponding intrument, in order to these soft numerical value of decoding to produce data.
The present invention also proposes a kind of signal processing method, comprising: receive a signal; Analyze this signal to obtain a phase error of this signal; Obtain a weight according to this phase error and a function; Produce a plurality of soft numerical value according to this weight and this signal; And these soft numerical value of decoding are to produce data.
The present invention also proposes a kind of signal processing system, comprise: sig-nal-conditioning unit, in order to receiving a signal and to analyze this signal obtaining a phase error of this signal, and produce a weight, and adjust this signal with this weight and adjust the back signal to produce one according to this phase error; The signal corresponding intrument is coupled to this sig-nal-conditioning unit, is a plurality of soft numerical value in order to change this adjustment back signal; And decoder, be coupled to this signal corresponding intrument, in order to these soft numerical value of decoding to produce data.
The present invention proposes to solve the receiving system and the method for the phase error that exists in the signal, makes decoder can receive message about this phase error, and can more correctly separate back data, makes signal processing system that better usefulness can be arranged.
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.
Description of drawings
The present invention must can clearly be understood by more deep by following detailed description in conjunction with the accompanying drawings:
Fig. 1 is the functional block diagram of existing signal processing system.
Fig. 2 is the functional block diagram of calculation element.
Fig. 3 is the signal processing system functional block diagram according to first embodiment of the invention illustrated.
Fig. 4 is the thin portion functional block diagram of calculation element and signal adjustment and the corresponding intrument of first embodiment.
Fig. 5 is the thin portion functional block diagram of calculation element and signal adjustment and the corresponding intrument of first embodiment.
Fig. 6 is the thin portion functional block diagram of calculation element and signal adjustment and the corresponding intrument of first embodiment.
Fig. 7 is the thin portion functional block diagram of calculation element and signal adjustment and the corresponding intrument of first embodiment.
Fig. 8 is the thin portion functional block diagram of calculation element and signal adjustment and the corresponding intrument of first embodiment.
Fig. 9 is the signal processing system functional block diagram according to second embodiment of the invention illustrated.
Figure 10 is the thin portion functional block diagram of sig-nal-conditioning unit and the signal corresponding intrument of second embodiment.
Figure 11 is the flow chart of the signal processing method of third embodiment of the invention.
Embodiment
Fig. 3 comprises: calculation element 320, signal adjustment and corresponding intrument 340 and decoder 380 for the functional block diagram according to the signal processing system 30 that first embodiment of the invention illustrated.
Calculation element 320 is according to the some of signal, and for example pilot signal is calculated phase error theta and produced phasing numerical value e J θCalculation element 320 also obtains a weight f (θ) according to a function f (x), and for example, weight f (θ) is inversely proportional to phase error theta, and function f (x) for example is f (x)=k1/ (k2+x i), wherein k1 and k2 are real number, i is a positive number, produces a weight f (θ).Wherein this signal comprises in-phase signal (I signal) and orthogonal signalling (Q signal), and this phase error comprises skew sample time, carrier frequency shift, phase noise and the skew of sampling clock pulse.
Signal is adjusted with corresponding intrument 340 received signals and only according to the weight f (θ) of calculation element 320 or simultaneously according to the weight f (θ) and the phasing numerical value e of calculation element 320 J θ, will more adjusted signal be corresponded to a plurality of soft numerical value after the signal adjustment.Decoder 380 is reduced to data output with these soft numerical value decodings.
Fig. 4 is the thin portion functional block diagram of calculation element and signal adjustment and the corresponding intrument of first embodiment, comprising: calculation element 330 and signal adjustment and corresponding intrument 350; The calculation element 320 that Fig. 3 painted, signal adjustment and corresponding intrument 340 can Fig. 4 paints calculation element 330, signal adjustment and corresponding intrument 350 come in addition real the work.Calculation element 330 comprises: phase error computation unit 322, weight calculation unit 324 and phasing numerical value generation unit 326.Signal adjustment and corresponding intrument 350 comprise at least: multiplication unit 341,345,346 and 347, reflection function corresponding unit 342,343 and 344 and quantifying unit 348,349 and 3410.
Phase error computation unit 322 calculates phase error theta according to pilot signal.Weight calculation unit 324 is according to a function calculation weight f (θ).Phasing numerical value generation unit 326 produces phasing numerical value e according to phase error J θMultiplication unit 341 with signal times with phasing numerical value e J θIn order to proofread and correct this signal.Signal adjustment and corresponding intrument 350 also should be proofreaied and correct the back signal and be divided into I coordinate figure and Q coordinate figure.Below lifting the I coordinate figure is example, and reflection function corresponding unit 342,343 and 344 according to a reflection function for example is:
I 0 _ 1 = I I 1 _ 1 = - | I | + 4 I 2 _ 1 = - | | I | - 4 | + 2
The I coordinate figure videoed respectively be functional value I 0_ 1, I 1_ 1 and I 2_ 1.Pass through multiplication unit 345,346 and 347 again with functional value I 0_ 1, I 1_ 1 and I 2_ 1 multiply by weight f (θ) to obtain adjusted value I 0_ 2, I 1_ 2 and I 2_ 2.Then pass through quantifying unit 348,349 and 3410 with adjusted value I 0_ 2, I 1_ 2 and I 2_ 2 are quantified as soft numerical value I 0, I 1And I 2
For example, I coordinate figure=5.3, then functional value I 0_ 1=5.3, I 1_ 1=-1.3 and I 2_ 1=0.7.F (x) for example is 0.2/x, and θ for example is 20 degree, f (θ)=0.01 then, and adjusted value is I 0_ 2=0.053, I 1_ 2=-0.0I3 and I 2_ 2=0.007.The soft numerical value that quantizes back (for example unconditional carry) is I 0=1, I 1=-1 and I 2=1.Therefore the Q coordinate figure in like manner repeats no more.
Fig. 5 is the thin portion functional block diagram of calculation element and signal adjustment and the corresponding intrument of first embodiment, comprising: calculation element 330 and signal adjustment and corresponding intrument 352.The calculation element 320 that Fig. 3 painted, signal adjustment and corresponding intrument 340 can Fig. 5 paints calculation element 330, signal adjustment and corresponding intrument 352 come in addition real the work.Among this embodiment, the functional value I that reflection function corresponding unit 342 is produced 0_ 1 quantizes to multiply each other with weight f (θ) by multiplication unit 3412 behind the formation intermediate value through quantifying unit 3411 earlier again, to obtain adjusted value I 0_ 4, release of an interleave (deinterleaving) unit 3413 release of an interleave adjusted value I afterwards 0_ 4 to produce soft numerical value I 0Other soft numerical value I 1, I 2And Q 0, Q 1, Q 2Producing method and aforementioned similar, repeat no more in this.
Fig. 6 is the thin portion functional block diagram of calculation element and signal adjustment and the corresponding intrument of first embodiment, comprising: calculation element 330 and signal adjustment and corresponding intrument 354.The calculation element 320 that Fig. 3 painted, signal adjustment and corresponding intrument 340 can Fig. 6 paints calculation element 330, signal adjustment and corresponding intrument 354 come in addition real the work.Among this embodiment, the functional value I that reflection function corresponding unit 342 is produced 0_ 1 quantizes the back through quantifying unit 3411 earlier forms intermediate value I 0_ 3, then again by producing release of an interleave numerical value I behind release of an interleave unit 3414 release of an interleaves 0_ 5, then multiplication unit 3415 is with release of an interleave numerical value I 0_ 5 multiply each other with weight f (θ), obtain soft numerical value I 0Other soft numerical value I 1, I 2And Q 0, Q 1, Q 2Producing method and aforementioned similar, repeat no more in this.
Fig. 7 is the thin portion functional block diagram of calculation element and signal adjustment and the corresponding intrument of first embodiment, comprising: calculation element 330 and signal adjustment and corresponding intrument 356.The calculation element 320 that Fig. 3 painted, signal adjustment and corresponding intrument 340 can Fig. 7 paints calculation element 330, signal adjustment and corresponding intrument 356 come in addition real the work.Multiplication unit 3416 multiply by weight f (θ) to produce adjusted value I_6 with the I coordinate figure.Inverse mapper 3417 is soft numerical value I with adjusted value I_6 inverse mapping 0, I 1And I 2Because weight f (θ) took advantage of before reflection function correspondence, therefore aforesaid reflection function need be revised as follows:
I 0 _ 6 * = I _ 6 I 1 _ 6 * = - | I _ 6 | + 4 · f ( θ ) I 2 _ 6 * = - | | I _ 6 | - 4 · f ( θ ) | + 2 · f ( θ )
The Q coordinate figure in like manner, and all the other function modes and aforementioned similar repeat no more in this.
Fig. 8 is the thin portion functional block diagram of calculation element and signal adjustment and the corresponding intrument of first embodiment, comprising: calculation element 330 and signal adjustment and corresponding intrument 358.The calculation element 320 that Fig. 3 painted, signal adjustment and corresponding intrument 340 can Fig. 8 paints calculation element 330, signal adjustment and corresponding intrument 358 come in addition real the work.Among this embodiment, the numerical value that multiplication unit 341 is produced is further divided into I_6 and Q_6 after multiply by weight f (θ) through multiplication unit 3418 earlier, makes I and Q coordinate figure can share a multiplication unit, produces soft numerical value I by inverse mapper 3417 again 0, I 1And I 2The Q coordinate figure in like manner, and all the other function modes and aforementioned similar repeat no more in this.
Fig. 9 comprises: sig-nal-conditioning unit 920, signal corresponding intrument 940 and decoder 980 for the functional block diagram according to the signal processing system 90 that second embodiment of the invention illustrated.
Sig-nal-conditioning unit 920 received signals are calculated phase error theta to produce phasing numerical value e J θ, and according to a function f (x) acquisition one weight f (θ), for example, weight f (θ) is inversely proportional to phase error theta, function f (x) for example is f (x)=k1/ (k2+x i), wherein k1 and k2 are real number, i is a positive number, produces a weight f (θ).Sig-nal-conditioning unit 920 is also according to phasing numerical value e J θAnd weight f (θ) adjusts signal to produce adjustment back signal.Wherein this signal comprises in-phase signal and orthogonal signalling, and this phase error comprises skew sample time, carrier frequency shift, phase noise and the skew of sampling clock pulse.Signal corresponding intrument 940 will be adjusted the back signal and correspond to a plurality of soft numerical value.Decoder 980 is reduced to data output with these soft numerical value decodings.
Figure 10 is the thin portion functional block diagram of sig-nal-conditioning unit and the signal corresponding intrument of second embodiment, comprising: sig-nal-conditioning unit 930 and signal corresponding intrument 950.Sig-nal-conditioning unit that Fig. 9 painted 920 and signal corresponding intrument 940 can Figure 10 paints sig-nal-conditioning unit 930 and signal corresponding intrument 950 come in addition real the work.Sig-nal-conditioning unit 930 comprises: phase error computation unit 922, weight calculation unit 924, phasing numerical value generation unit 926 and multiplier 928.Multiplier 928 comprises multiplication unit 9282 and 9284.
Phase error computation unit 922 calculates phase error theta according to pilot signal.Weight calculation unit 924 is converted to weight f (θ) according to a function with phase error theta.Phasing numerical value generation unit 926 produces phasing numerical value e according to phase error J θMultiplication unit 9282 with signal times with phasing numerical value e J θIn order to adjust this signal.Multiplication unit 9284 will be adjusted the back signal and multiply by weight f (θ) again in order to this signal of further adjustment, to solve the phase error that still is present in the system, so can make more correctly processing signals of signal processing system 90.Be noted that multiplication unit 9282 and 9284 can also be realized by a single multiplication unit, is not limited to a plurality of multiplication units.Signal corresponding intrument 950 is divided into I coordinate figure and Q coordinate figure with signal, produces soft numerical value I by inverse mapper 3417 again 0, I 1, I 2, Q 0, Q 1And Q 2
Figure 11 is the flow chart of the signal processing method of third embodiment of the invention.Step 1101 receives a signal, and wherein this signal comprises a plurality of complex datas, and this signal also comprises an in-phase signal and orthogonal signalling.Step 1103, analyze this signal to obtain a phase error theta of this signal, wherein only the selected part signal analysis is obtaining the phase error theta of this signal, and this phase error system is relevant to skew sample time, carrier frequency shift, phase noise or the skew of sampling clock pulse.Then, produce a phasing numerical value e according to phase error theta J θ, and with phasing numerical value e J θCorrection signal.Step 1105 obtains a weight f (θ) according to a phase error theta and a function f (x), and for example, weight f (θ) is inversely proportional to phase error theta, and function for example is f (x)=k1/ (k2+x i), wherein k1 and k2 are real number, i is a positive number.Again with weight f (θ) or simultaneously with weight f (θ) and phasing numerical value e J θAdjust signal and adjust the back signal to produce.Step 1107, according to weight f (θ) and this signal, this correction back signal maybe should adjustment afterwards signal produce a plurality of soft numerical value.Step 1109, these soft numerical value of decoding are to produce data.
In sum, the present invention proposes to solve the phase error that exists in the receiving system, if decoder can be received the message about this phase error, then can more correctly separate back data.Therefore, the present invention proposes signal processing system and the method that a kind of phase error of passing through signal is adjusted signal, makes signal processing system that better usefulness can be arranged.
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 this operator, 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 (20)

1. signal processing system comprises:
One calculation element, in order to receiving a signal, and calculate a phase error of this signal and according to this phase error to produce a weight;
One signal adjustment and corresponding intrument is coupled to this calculation element, in order to receive this signal and to produce a plurality of soft numerical value according to this weight and this signal; And
One decoder is coupled to this signal adjustment and corresponding intrument, in order to these soft numerical value of decoding to produce data.
2. system according to claim 1 is characterized in that, this calculation element comprises:
One phase error computation unit is in order to calculate this phase error according to the part of this signal; And
One weight calculation unit is coupled to this phase error computation unit, in order to according to a function this phase error is converted to this weight.
3. system according to claim 2 is characterized in that, this function is f (x)=k1/ (k2+x i), wherein k1 and k2 are real numbers, i is a positive number.
4. system according to claim 2, it is characterized in that, this calculation element also comprises a phasing numerical value generation unit, in order to produce a phasing numerical value according to this phase error, and this signal adjustment and corresponding intrument are also with this this signal of phasing data calibration, and should proofread and correct the back conversion of signals according to this weight again was these soft numerical value.
5. system according to claim 1 is characterized in that, this weight is to be inversely proportional to this phase error.
6. system according to claim 1 is characterized in that, this phase error is to be relevant to skew sample time, carrier frequency shift, phase noise or the skew of sampling clock pulse.
7. system according to claim 4 is characterized in that, this signal adjustment and corresponding intrument comprise:
A plurality of reflection function corresponding units corresponded to a plurality of functional values in order to should proofread and correct the back signal;
A plurality of multiplication units are coupled to these reflection function corresponding units, in order to these functional values be multiply by this weight to produce a plurality of adjusted values; And
A plurality of quantifying unit are coupled to these multiplication units, in order to these adjusted values are quantified as these soft numerical value.
8. system according to claim 4 is characterized in that, this signal adjustment and corresponding intrument comprise:
A plurality of reflection function corresponding units corresponded to a plurality of functional values in order to should proofread and correct the back signal;
A plurality of quantifying unit are coupled to these reflection function corresponding units, in order to these functional values are quantified as a plurality of intermediate values;
A plurality of multiplication units are coupled to these quantifying unit, in order to these intermediate values be multiply by this weight to export a plurality of adjusted values; And
A plurality of release of an interleaves unit is coupled to these multiplication units, in order to being these soft numerical value with these adjusted value release of an interleaves.
9. system according to claim 4 is characterized in that, this signal adjustment and corresponding intrument comprise:
A plurality of reflection function corresponding units corresponded to a plurality of functional values in order to should proofread and correct the back signal;
A plurality of quantifying unit are coupled to these reflection function corresponding units, in order to these functional values are quantified as a plurality of intermediate values;
A plurality of release of an interleaves unit is coupled to these quantifying unit, in order to being a plurality of release of an interleave numerical value with these intermediate value release of an interleaves; And
A plurality of multiplication units are coupled to these release of an interleave unit, in order to these release of an interleave numerical value be multiply by this weight to produce these soft numerical value.
10. system according to claim 4 is characterized in that, this signal adjustment and corresponding intrument comprise:
At least one multiplication unit, in order to should proofread and correct the back signal times with this weight to export a plurality of adjusted values; And
A plurality of inverse mappers are coupled to these multiplication units, in order to being these soft numerical value with these adjusted value inverse mappings.
11. system according to claim 1 is characterized in that, this signal comprises together phase signals and orthogonal signalling.
12. a signal processing method comprises:
Receive a signal;
Analyze this signal to obtain a phase error of this signal;
Obtain a weight according to this phase error and a function;
Produce a plurality of soft numerical value according to this weight and this signal; And
Decode these soft numerical value to produce data.
13. method according to claim 12 is characterized in that, this signal comprises a plurality of complex datas, and the step of this analysis comprises that a part of choosing these complex datas is in order to obtain this phase error.
14. method according to claim 12 is characterized in that, this function is f (x)=k1/ (k2+x i), wherein k1 and k2 are real numbers, i is a positive number.
15. method according to claim 12 is characterized in that, this phase error is to be relevant to skew sample time, carrier frequency shift, phase noise or the skew of sampling clock pulse.
16. method according to claim 12 is characterized in that, also comprises:
Produce a phasing numerical value according to this phase error;
With this this signal of phasing data calibration; And
Should proofread and correct the back conversion of signals according to this weight is these soft numerical value.
17. method according to claim 12 is characterized in that, the step that produces a plurality of soft numerical value according to this weight and this signal comprises:
Adjust this signal with this weight and adjust the back signal to produce one; And
Changing this adjustment back signal is a plurality of soft numerical value.
18. method according to claim 12 is characterized in that, the step that produces a plurality of soft numerical value according to this weight and this signal comprises:
According to this phase error computation one phasing numerical value;
Adjust this signal with this weight and this phasing numerical value and adjust the back signal to produce one; And
Changing this adjustment back signal is a plurality of soft numerical value.
19. a signal processing system comprises:
One sig-nal-conditioning unit in order to receiving a signal and to analyze this signal obtaining a phase error of this signal, and produces a weight according to this phase error, and adjusts this signal with this weight and adjust the back signal to produce one;
One signal corresponding intrument is coupled to this sig-nal-conditioning unit, is a plurality of soft numerical value in order to change this adjustment back signal; And
One decoder is coupled to this signal corresponding intrument, in order to these soft numerical value of decoding to produce data.
20. system according to claim 19 is characterized in that, this sig-nal-conditioning unit comprises:
One phase error computation unit is in order to according to this phase error of this calculated signals;
One weight calculation unit is coupled to this phase error computation unit, in order to according to a function this phase error is converted to this weight; And
One multiplier is coupled to this weight calculation unit, in order to this signal times with this weight to produce this adjustment back signal.
CN200910254132.6A 2009-12-07 2009-12-07 System and method for processing signals Expired - Fee Related CN102088428B (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1852278A (en) * 2006-04-24 2006-10-25 上海交通大学 Phase tracking loop with NR decoding

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1852278A (en) * 2006-04-24 2006-10-25 上海交通大学 Phase tracking loop with NR decoding

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