CN104935538B - The GFSK intersymbol interference cancellation processing method and device of low complex degree - Google Patents
The GFSK intersymbol interference cancellation processing method and device of low complex degree Download PDFInfo
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Abstract
The present invention relates to the GFSK intersymbol interference cancellation processing method and device of a kind of low complex degree, it comprises the following steps：Step 1, signal ym+1To obtain signal y after the delay of the second delayerm, and export sign (y after being adjudicated by the first symbol judgement devicem+1)；Step 2, first adder are by sign (ym+1) and signal rm‑1Added up, to obtain the first accumulated value；First accumulated value, automatic estimation parameter h_Est are carried out product by step 3, the first multiplier, to obtain the first product value；First product value, symbol interference adjustable parameters Hm1 are carried out product by step 4, the second multiplier, to obtain the second product value；Step 5, second adder are to the second product value, signal ymIt is poor to carry out work, to obtain the second accumulated value；Step 6, the second accumulated value that second adder exports transmitted to the second symbol judgement device, obtain adjudicating output signal r to carry out symbol judgement by the second symbol judgement devicem.The present invention has preferable demodulation ability, realizes decision-feedback structure simple in construction, wide adaptation range.
Description
Technical field
The present invention relates to a kind of processing method and processing device, at the GFSK intersymbol interference counteractings of especially a kind of low complex degree
Method and device is managed, belongs to the technical field of signal transacting.
Background technology
GMSK (Gaussian filtered MSK) signal grows up on the basis of MSK modulated signals, MSK
Signal can regard the continuous phase fsk signal that modulation index is 0.5 as, although it has constant-envelope, Phase Continuation, relative
The advantages of narrower bandwidth and energy coherent demodulation, but it can not meet strict demand of some communication systems to out-of-band radiation.For
The power spectrum of compression msk signal, the increase one-level pre-modulation filter before MSK is modulated, so as to restrained effectively signal
Out-of-band radiation.GMSK signals are exactly the msk signal that pre-modulation filter is gauss low frequency filter.Because it has excellent work(
Rate spectral property (the fast attenuation characteristic of power spectrum secondary lobe), obtained in the various digital communicating fields to the strict limitation of signal band wide
General application, and due to its constant-envelope, ratio is embodied in the nonlinear channel that the C class A amplifier As with amplitude limiting characteristic are formed
The more advantages of BPSK phase-modulations, so particularly suitable for satellite communication and mobile communication.
In the physical layer standard of bluetooth 4.0, contain BLE GMSK modulation mode (frequency modulation index (FM index) between 0.45~0.55,
Wherein 0.5 be GMSK) and BT in Basic Rate GFSK modulation systems (frequency modulation index (FM index) 0.28~0.35).Gaussian filter
While restrained effectively signal out-of-band radiation, intersymbol interference is introduced, interference introducing degree depends primarily on parameter
BT value (the product of three dB bandwidth and symbol time width, for Bluetooth system for 0.5), BT values are smaller, disturbed between created symbol
It is bigger.Certainly, other type compact schemes wave filters, such as raised cosine filter can also be selected in theory.
The processing complexity of the removal intersymbol interference of existing better performances is high, is not particularly suitable for consumer electronics.Such as：
MLSE methods (need to use Viterbi decoded modes), DFE methods (decision feedback equalization).
The content of the invention
The purpose of the present invention is to overcome the deficiencies in the prior art, there is provided a kind of GFSK intersymbols of low complex degree are done
Cancellation processing method and device are disturbed, it has preferable demodulation ability, realizes decision-feedback structure simple in construction, accommodation
Extensively, securely and reliably.
According to technical scheme provided by the invention, a kind of GFSK intersymbol interference cancellation processing methods of low complex degree, institute
GFSK intersymbol interference cancellation processing methods are stated to comprise the following steps：
Step 1, determine the signal y after the judgement of optimum sampling positionm+1, the signal ym+1Through the second delayer delay after with
Obtain signal ym, and signal ym+1Sign (y are exported after being adjudicated by the first symbol judgement devicem+1)；
Step 2, the sign (y for exporting the first symbol judgement devicem+1) transmit to first adder, and first adder
The first delayer is also received to adjudicating output signal rmSignal r after delaym-1, first adder is by sign (ym+1) and signal
rm-1Added up, to obtain the first accumulated value；
Step 3, the first accumulated value that first adder exports transmitted to the first multiplier, and the first multiplier also connects
Automatic estimation parameter h_Est is received, the first accumulated value, automatic estimation parameter h_Est are carried out product by the first multiplier, to obtain the
One product value；
Step 4, the first product value that the first multiplier exports transmitted to the second multiplier, and the second multiplier also connects
Symbol interference adjustable parameters Hm1 is received, the first product value, symbol interference adjustable parameters Hm1 are carried out product by the second multiplier,
To obtain the second product value；
Step 5, by the second multiplier export the second product value transmit to second adder, second adder connects simultaneously
Collection of letters ym, second adder is to the second product value, signal ymIt is poor to carry out work, to obtain the second accumulated value；
Step 6, by second adder export the second accumulated value transmit to the second symbol judgement device, with pass through second symbol
Number decision device carries out symbol judgement and obtains adjudicating output signal rm。
First accumulated value of first adder output is 0 ,+1 or -1.
For BT=0.5 GFSK signals, the first delayer, the duration of delay of the second delayer are 1 symbol.
A kind of GFSK intersymbol interference signal processing apparatus of low complex degree, including for receiving optimum sampling position criterion
Signal y afterwardsm+1The second delayer and the first symbol judgement device, the output end of the first symbol judgement device and first adder
Input is connected, and the output end of the input of first adder also with the first delayer be connected, the output end of first adder and
The input connection of first multiplier, the output end of the first multiplier are connected with the input of the second multiplier, the second multiplier
Output end and the input of second adder connect, the input of second adder also connects with the output end of the second delayer
Connect, the output end of second adder is connected with the input of the second symbol judgement device, the output judgement output of the second symbol judgement device
Signal rm, and input of the output end of the second symbol judgement device also with the first delayer is connected；
Signal ym+1To obtain signal y after the delay of the second delayerm, and signal ym+1After being adjudicated by the first symbol judgement device
Export sign (ym+1)；First adder is by the first delayer to adjudicating output signal rmSignal r after delaym-1, the first addition
Device is by sign (ym+1) and signal rm-1Added up, to obtain the first accumulated value；
First accumulated value of reception, automatic estimation parameter h_Est are carried out product by the first multiplier, to obtain the first product
Value；First product value of reception, symbol interference adjustable parameters Hm1 are carried out product by the second multiplier, to obtain the second product
Value；
Second adder while reception signal ym, second adder is to the second product value, signal ymIt is poor to carry out work, to obtain
Second accumulated value, symbol judgement is carried out to the second accumulated value by the second symbol judgement device and obtains adjudicating output signal rm。
First accumulated value of first adder output is 0 ,+1 or -1.
For BT=0.5 GFSK signals, the first delayer, the duration of delay of the second delayer are 1 symbol.
Advantages of the present invention：With preferable demodulation ability, decision-feedback structure simple in construction, accommodation are realized
Extensively, securely and reliably.
Brief description of the drawings
Gaussian filter integral curve when Fig. 1 is BT=0.5 of the present invention.
The eye pattern of single carrier communication when Fig. 2 is BT=0.5 of the present invention.
Fig. 3 is a kind of specific implementation structured flowchart of the present invention.
Description of reference numerals：The delayers of 10- second, the first symbol judgements of 20- device, 30- first adders, 40- first multiply
Musical instruments used in a Buddhist or Taoist mass, the multipliers of 50- second, 60- second adders, 70- the second symbol judgement devices and the delayers of 80- first.
Embodiment
With reference to specific drawings and examples, the invention will be further described.
For BT systems (Bluetooth system), gaussian frequency shift keying (GFSK, Gaussian filtered
Frequency ShiftKeying) system complex baseband signal can be expressed as：
rb(t)=ejφ(t)
Wherein, t is the time of reception, rb(t) it is the base band time domain signal changed over time received, φ (t) is with the time
The phase signal of change, j are imaginary unit.Further,
Specifically, anIt is+1 or -1 for 2GFSK values, other values, g (τ) can be taken for other FSK systems：For height
This function, variable when τ ' is only variable replacement, T is symbol time width, such as BT systems are 1 μ s (microsecond), kFMFor modulation frequency
Modulation index.
For low-power consumption bluetooth system (BLE：BlueToothwithLowEnergy), kFM=0.5 (GMSK:
GaussianFilteredMinimumShiftKeying GMSK Gaussian-filtered minimum shift keyings)；And for Bluetooth system (BT：
BlueTooth), kFM=0.32 (GFSK), wherein,To normalize Gaussian filter, also known as frequency
Shaping function,For normalized parameter, B is three dB bandwidth, and T is that (such as BLE/BT systems are 1 to symbol symbol time width
μs).Certainly, other type compact schemes wave filters, such as raised cosine filter can also be selected in theory.
The present invention illustrates by taking BT=0.5 as an example.Gaussian filter is integrated, as shown in figure 1, upper limit of integral with
The integral result of time change can be expressed as：
Wherein, G (t) is the integral function of Gaussian filter, also known as phase shaping function, it is clear that G (t) has following special
Property：
1), G (t)+G (- t)=1, especially G (0.5)+G (- 0.5)=1.
2), G (t) is sampled by T intervals, and remembers G (nT)=G (n), is had
Support Interval width be 2LT (L is interference constraints length factor, L=1 mean current sign only by previous and
The latter symbol-interference).
If M is delayed symbol he number, then
Complex baseband signal rb(t) at intervals of MT two version rb(t), rb(t-MT) conjugate product dM(t) it is：
Wherein * is complex conjugate operation,
There is BT=0.5 for BT or BLE systems, L=1, φ (t-MT) are that φ (t) postpones the signal after MT.
Because BT system symbols chip rate is 1MHz, so intersymbol interference counteracting processing is carried out in 1MHz speed,
That is M=1, then have
Above formula Δ φ1' (t) is expression of the reception signal in angle domain, if being folded by the cycle, you can obtain list
Eye pattern in carrier communication system, as shown in Figure 2.
The place (being dotted line position in figure) that maximum is opened in eye pattern is the Δ φ demodulated on 1MHz1(m+0.5)。
According to single-carrier system demodulation principle, eye pattern is selected to open maximum place (being dotted line position in figure) as most
Good sampling judgement position, after optimum sampling judgement position operation, the signal demodulated on 1MHz is
Δφ1(m+0.5)=π kFMΔφ1′(m+0.5)
Wherein, by G (0.5)+G (- 0.5)=1, then Δ φ1' (m+0.5) be
From above formula, in order to demodulate am, it is necessary to obtain am-1And am+1.Due to am+1, can be with next for future signal
The direct judgement of individual symbol replaces, as Δ φ1' (m+1.5) symbol.
In practical implementations, it is solely focused on amSymbol, i.e.,
rm=sign (am)
=sign [Δ φ1′(m+0.5)-(am+1+am-1)G(-0.5)]
=sign { Δ φ1′(m+0.5)-[sign(Δφ1′(m+1.5))+rm-1]G(-0.5)}
It is assumed that ym=Δ φ1' (m+0.5), ζ=G (- 0.5)=0.1057, then rm=sign { ym-[sign(ym+1)+rm-1]
ζ}。
As shown in figure 3, according to the above description, to BT=0.5 Bluetooth system, in order to carry out the GFSK of low complex degree symbols
Disturb and eliminate between number, the present invention includes being used to receive signal y after the criterion of optimum sampling positionm+1The second delayer 10 and
One symbol judgement device 20, the output end of the first symbol judgement device 20 are connected with the input of first adder 30, first adder
Output end of 30 input also with the first delayer 80 is connected, and the output end of first adder 30 is defeated with the first multiplier 40
Enter end connection, the output end of the first multiplier 40 is connected with the input of the second multiplier 50, the output end of the second multiplier 50
It is connected with the input of second adder 60, the output end of the input of second adder 60 also with the second delayer 10 is connected,
The output end of second adder 60 is connected with the input of the second symbol judgement device 70, and the output judgement of the second symbol judgement device 70 is defeated
Go out signal rm, and input of the output end of the second symbol judgement device 70 also with the first delayer 80 is connected；
Signal ym+1To obtain signal y after the delay of the second delayer 10m, and signal ym+1Sentenced by the first symbol judgement device 20
Sign (y are exported after certainlym+1)；First adder 30 is by the first delayer 80 to adjudicating output signal rmSignal r after delaym-1,
First adder 30 is by sign (ym+1) and signal rm-1Added up, to obtain the first accumulated value；
First accumulated value of reception, automatic estimation parameter h_Est are carried out product by the first multiplier 40, are multiplied with obtaining first
Product value；First product value of reception, symbol interference adjustable parameters Hm1 are carried out product by the second multiplier 50, to obtain second
Product value；
Second adder 60 while reception signal ym, second adder 60 is to the second product value, signal ymIt is poor to carry out work, with
The second accumulated value is obtained, symbol judgement is carried out to the second accumulated value by the second symbol judgement device 70 and obtains adjudicating output signal
rm。
Specifically, Dat_1x (1,1,6) is that the eye pattern received opens the signal value of maximum position in figure, and BT systems are realized real
Example use 8bit expressions (first 1 for bit symbol position, second 1 is 1 bit integer position, and 6 be 6 bit decimal places), in figure
Numerical value can use (x, y, z) quantization means form, wherein, x is sign bit digit, and y is integer number of bits, and z is
Decimal number of bits, x values are expressed as signed number when being 1, value is expressed as unsigned number for 0.
Automatic estimation parameter h_Esth_Est values are π kFM, it is constant for fixed modulation index.Symbol interference can adjust
Parameter Hm1 is ζ, and the interference size that ζ=G (- 0.5), ζ size and front and rear symbol are brought is corresponding.When realizing, symbol interference can
Adjusting parameter Hm1 can pass through register configuration.In order to consider the influence of other wave filters, unique parameters ζ can be adjusted.As general
When ζ parameters are arranged to 0, that is, deteriorate to simplest directly judgement structure in traditional sense.The present invention is than directly adjudicating mode solution
The performance of tune can improve 1~2dB.
SgnAC(end):Last bit that Access Code are mapped to after +/- 1 sequence (Interference Cancellation be
Carried out after Access Code synchronization decisions in 1MHz speed), in figure：First delayer 80 (D1) is initialized as SgnAC
(end), second delayer 10 (D2) is initialized as 0.
Further, the first accumulated value that first adder 30 exports is 0 ,+1 or -1.Believe for BT=0.5 GFSK
Number, the first delayer 80, the duration of delay of the second delayer 10 are 1 symbol.
From the foregoing, GFSK intersymbol interference cancellation processing method of the present invention comprises the following steps：
Step 1, determine the signal y after the judgement of optimum sampling positionm+1, the signal ym+1After the delay of the second delayer 10
To obtain signal ym, and signal ym+1Sign (y are exported after being adjudicated by the first symbol judgement device 20m+1)；
Step 2, the sign (y for exporting the first symbol judgement device 20m+1) transmit to first adder 30, and first adds
Musical instruments used in a Buddhist or Taoist mass 30 also receives the first delayer 80 to adjudicating output signal rmSignal r after delaym-1, first adder 30 is by sign
(ym+1) and signal rm-1Added up, to obtain the first accumulated value；
Step 3, the first accumulated value for exporting first adder 30 are transmitted to the first multiplier 40, and the first multiplier
40 also receive automatic estimation parameter h_Est, and the first accumulated value, automatic estimation parameter h_Est are carried out product by the first multiplier 40,
To obtain the first product value；
Step 4, the first product value that the first multiplier 40 exports transmitted to the second multiplier 50, and the second multiplier
50 go back receiving symbol interference adjustable parameters Hm1, and the second multiplier 50 is by the first product value, symbol interference adjustable parameters Hm1
Product is carried out, to obtain the second product value；
Step 5, the second product value that the second multiplier 50 exports transmitted to second adder 60, second adder 60
Reception signal y simultaneouslym, second adder 60 is to the second product value, signal ymIt is poor to carry out work, to obtain the second accumulated value；
Step 6, the second accumulated value for exporting second adder 60 are transmitted to the second symbol judgement device 70, to pass through
Two symbol judgement devices 70 carry out symbol judgement and obtain adjudicating output signal rm。
The present invention can improve 1~2dB of GFSK systems receptivity, be also applied for continuous phase (CPM) modulating system,
Simply it is front and rear intersymbol interference be present code element number it is more, Interference Cancellation operation exponent number it is higher, be specifically no longer described in detail.
Claims (6)
1. a kind of GFSK intersymbol interference cancellation processing methods of low complex degree, it is characterized in that, the GFSK intersymbol interference is supported
The processing method that disappears comprises the following steps：
Step 1, determine the signal y after the judgement of optimum sampling positionm+1, the signal ym+1Through the second delayer (10) delay after with
Obtain signal ym, and signal ym+1Sign (y are exported after being adjudicated by the first symbol judgement device (20)m+1)；
Step 2, the sign (y for exporting the first symbol judgement device (20)m+1) transmit to first adder (30), and first adds
Musical instruments used in a Buddhist or Taoist mass (30) also receives the first delayer (80) to adjudicating output signal rmSignal r after delaym-1, first adder (30) will
sign(ym+1) and signal rm-1Added up, to obtain the first accumulated value；
Step 3, the first accumulated value that first adder (30) exports transmitted in the first multiplier (40), and the first multiplier
(40) automatic estimation parameter h_Est is also received, the first multiplier (40) carries out the first accumulated value, automatic estimation parameter h_Est
Product, to obtain the first product value；
Step 4, the first product value that the first multiplier (40) exports transmitted in the second multiplier (50), and the second multiplier
(50) receiving symbol interference adjustable parameters Hm1 is gone back, the second multiplier (50) is by the first product value, symbol interference adjustable parameters
Hm1 carries out product, to obtain the second product value；
Step 5, the second product value that the second multiplier (50) exports is transmitted to, second adder interior to second adder (60)
While reception signal y (60)m, second adder (60) is to the second product value, signal ymIt is poor to carry out work, to obtain the second accumulated value；
Step 6, the second accumulated value that second adder (60) exports transmitted in the second symbol judgement device (70), to pass through the
Two symbol judgement devices (70) carry out symbol judgement and obtain adjudicating output signal rm。
2. the GFSK intersymbol interference cancellation processing methods of low complex degree according to claim 1, it is characterized in that：First adds
First accumulated value of musical instruments used in a Buddhist or Taoist mass (30) output is 0 ,+1 or -1.
3. the GFSK intersymbol interference cancellation processing methods of low complex degree according to claim 1, it is characterized in that：For BT
=0.5 GFSK signals, the first delayer (80), the duration of delay of the second delayer (10) are 1 symbol.
4. a kind of GFSK intersymbol interference signal processing apparatus of low complex degree, it is characterized in that：Including for receiving optimum sampling
Signal y after the criterion of positionm+1The second delayer (10) and the first symbol judgement device (20), the first symbol judgement device (20)
Output end is connected with the input of first adder (30), the input of first adder (30) also with the first delayer (80)
Output end is connected, and the output end of first adder (30) is connected with the input of the first multiplier (40), the first multiplier (40)
Output end be connected with the input of the second multiplier (50), the output end of the second multiplier (50) and second adder (60)
Input is connected, and the output end of the input of second adder (60) also with the second delayer (10) is connected, second adder
(60) output end is connected with the input of the second symbol judgement device (70), the second symbol judgement device (70) output judgement output letter
Number rm, and input of the output end of the second symbol judgement device (70) also with the first delayer (80) is connected；
Signal ym+1To obtain signal y after the second delayer (10) delaym, and signal ym+1Sentenced by the first symbol judgement device (20)
Sign (y are exported after certainlym+1)；First adder (30) is by the first delayer (80) to adjudicating output signal rmSignal after delay
rm-1, first adder (30) is by sign (ym+1) and signal rm-1Added up, to obtain the first accumulated value；
First accumulated value of reception, automatic estimation parameter h_Est are carried out product by the first multiplier (40), to obtain the first product
Value；First product value of reception, symbol interference adjustable parameters Hm1 are carried out product by the second multiplier (50), to obtain second
Product value；
Second adder (60) while reception signal ym, second adder (60) is to the second product value, signal ymIt is poor to carry out work, with
The second accumulated value is obtained, symbol judgement is carried out to the second accumulated value by the second symbol judgement device (70) and obtains adjudicating output signal
rm。
5. the GFSK intersymbol interference signal processing apparatus of low complex degree according to claim 4, it is characterized in that：First addition
First accumulated value of device (30) output is 0 ,+1 or -1.
6. the GFSK intersymbol interference signal processing apparatus of low complex degree according to claim 4, it is characterized in that：For BT=
0.5 GFSK signals, the first delayer (80), the duration of delay of the second delayer (10) are 1 symbol.
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| CN111628816B (en) * | 2019-01-03 | 2022-02-01 | 长沙天仪空间科技研究院有限公司 | Narrow-band interference suppression method of satellite communication system |
| CN115604062B (en) * | 2022-10-08 | 2024-04-12 | 杭州万高科技股份有限公司 | Double-bit group demodulation method and demodulator in GFSK communication mode |
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| CN102368758A (en) * | 2011-09-01 | 2012-03-07 | 南京航空航天大学 | New improvement scheme about gaussian minimum shift keying (GMSK) modulation technology |
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| KR100585153B1 (en) * | 2004-08-04 | 2006-05-30 | 삼성전자주식회사 | Wired/wireless communication receiver and method for improving equalizer by multipath delay spread estimation |
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| CN1234926A (en) * | 1996-10-10 | 1999-11-10 | 统计信号处理公司 | Signal processor employing spectral property of signals |
| CN102404259A (en) * | 2010-09-13 | 2012-04-04 | 凌阳科技股份有限公司 | Mixing balance system |
| CN102368758A (en) * | 2011-09-01 | 2012-03-07 | 南京航空航天大学 | New improvement scheme about gaussian minimum shift keying (GMSK) modulation technology |
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Address after: 214072 A3 building, No. 777 West building, Binhu District, Binhu District, Jiangsu, Wuxi, 11 Applicant after: Jiangsu Zhuo Sheng microelectronics Limited by Share Ltd Address before: 214072 Jiangsu province Binhu District of Wuxi City Liyuan Development Zone 530 No. 1 building twelve room 1203 Applicant before: JIANGSU MAXSCEND TECHNOLOGY CO., LTD. |
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