CN105703879B - A kind of two condition Viterbi detection system and method - Google Patents
A kind of two condition Viterbi detection system and method Download PDFInfo
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Abstract
The present invention provides a kind of two condition Viterbi detection system and method, which includes: that time domain is transformed into frequency domain module, for the time-domain sample point signal of input to be converted to domain samples point signal；Difference judging module, for obtaining decision bits and judgment variables；Phase error computation module obtains decision error variable for calculating error；Frequency domain two condition viterbi module；For obtaining revised decision error variate-value to multiple decision error variable joint-detections；Cache module, for storing decision bits, to match the processing delay of frequency domain two condition viterbi module introducing；Decision bits correction module is modified decision bits using revised decision error variable.The beneficial effects of the invention are as follows not only can get good detection performance, but also system complexity can be reduced, and insensitive to factors such as h value, frequency deviation, phase, matched filters.
Description
Technical field
The invention belongs to Sequence Detection technical field more particularly to a kind of two condition Viterbi detection system and methods.
Background technique
The demodulation techniques of communication system are generally divided into coherent demodulation and non-coherent demodulation.Coherent demodulation usually requires receiver
Restore carrier frequency and carrier phase first, is then solved using channel estimation technique and balancing technique to signal is received
It adjusts, restore and adjudicates.But receiver is to obtain with the same phase of frequency, is usually to have certain difficulty.Non-coherent demodulation technology is not required to
It wants receiver to reach with the same phase of frequency, relatively easily realizes, but the demodulation performance of non-coherent demodulation technology is usually than relevant
The demodulation performance of demodulation techniques is poor.
Currently, Continuous Phase Modulation (Continuous Phase Modulation, CPM) technology, such as GFSK Gaussian Frequency Shift Keying
Modulation (Gauss frequency Shift Keying, GFSK) technology possesses good spectrum efficiency, has had been applied to and has been permitted
In multisystem, for example bluetooth (Bluetooth, BT) and global system for mobile communications (Global system for mobile
Communications, GSM)；GFSK system can use coherent demodulation, can also use non-coherent demodulation.But due to relevant
Demodulation needs to possess good tracking performance to carrier frequency and phase, often very difficult in systems in practice.Therefore, non-phase
Dry demodulation techniques application is more universal.
Critically important a kind of demodulation techniques are differential ference spiral technology, also referred to as Differential Detection in non-coherent demodulation technology
(Differential Detection, DD) technology.Differential Detection technology is facing generally towards differential modulation communication system；Namely
It says, differential modulation communication system modulates information source data using differential modulation technology in transmitting terminal first, then utilizes in receiving end
Differential Detection technology demodulates the signal received.GFSK modulating system is exactly a kind of differential modulation system.Differential Detection technology is logical
It often include three classes；The first kind belongs to direct Technology of Judgment, i.e., directly makes decisions to reception signal；Second class belongs to balanced skill
Art usually utilizes decision feedback equalizer, first inhibits interference signal as much as possible, then make decisions to equalizing signal；Third class
Differential Detection technology usually utilizes famous Viterbi (Viterbi) testing principle, is passed in principle using maximum likelihood to multiple
It receiving symbol and carries out cascading judgement, further increase detection performance, Viterbi technology can usually obtain preferable detection performance,
But its complexity is also higher.
In the prior art, for GFSK modulating system, people are in order to obtain the excellent performance of Viterbi scheme, and simultaneously
It is not intended to pay higher complexity cost, thus energetically seeks some suboptimal designs, under the premise of performance loss is little,
Complexity is significantly reduced, as CPM signal is expressed as many pulse amplitude modulations using Laurent decomposition technique by people
(PAM) accumulation result of signal, since the PAM signal after decomposing possesses linear properties, Laurent decomposition technique, which can simplify, to be connect
The design of receipts machine, as shown in Figure 1, input signal is time-domain signal, h (t) is matched filter, and L is that the part of CPM signal is rung
The time span (as unit of symbol period T) for answering filter to occupy, although this scheme can obtain good detection performance,
Its complexity is too high, it usually needs multiple matched filters, the status number of Vitebi detector are also higher (typically larger than 4).Separately
Outside, the number of PAM signal can also be reduced, namely approximation CPM signal, is further decreased based on Laurent decomposition technique
The status number of Vitebi detector can be decreased to 2, but can introduce the loss of performance by the complexity of reception scheme.
The practical technical principle with reference to optimum receiver of above scheme, also requires the precondition with frequency with phase.
Receiver is not needed for noncoherent receiver to reach with the same phase of frequency, is illustrated in figure 2 and skill is decomposed based on Laurent
The technical solution schematic diagram of the noncoherent receiver of art, r (t) they are the time-domain signal received, and h (t) is matched filter group, with
Each PAM signal matches；WF represents prewhitening filter, it is therefore an objective to by input signal albefaction；WMF represents whitened matched filter
Group；Signal first carries out Branch Metric calculating after albefaction, recycles Viterbi processor detection information bit.
To obtain preferable performance, in the whitened matched filter number and Viterbi detector in above-mentioned suboptimal design
Trellis states could number it is still more, and whitened matched filter needs also to show by meticulous design and above scheme
Many drawbacks such as sensitive to the value of modulation index h out.
Furthermore it is also possible to use Rimoldi/Huber&Liu decomposition technique to CPM signal, Rimoldi/Huber&Liu divides
Not varying signal when the thought of solution technology is the linearly invariant Lattice encoding device for being expressed as CPM signal to have memory and is memoryless
The combination of mapper.Using the decomposition technique, filter can be designed and raster search separates individually processing, and then realized multiple
Miscellaneous degree can be decreased obviously.But the trellis states could number of its Viterbi detector is still more, and related with modulation index h value.It lifts
For example, if h=1/3, state number 6；If h=0.29=29/100, state number 200, this is to cannot achieve
's.Therefore, further, state number is reduced using PSP thought, the core concept of PSP technology is phase shape related with h
State can be using the survivor path offhand decision for terminating at current state.The program can at least use a matched filter and two
State Viterbi detector, corresponding general receiver scheme as shown in figure 3, r (t) be time-domain signal, first pass through matching filter
Wave device, then Viterbi detection processing is carried out, it is final to obtain detection bit sequence.T is symbol period, and M is sequence length, L CPM
The length (as unit of symbol period) of the partial-response filtering device of signal, p are the denominator of modulation index h, h=q/p, q and p without
Method further reduces.
The complexity of the program can receive, but the program is very sensitive to carrier wave frequency deviation and phase, needs higher
Estimated accuracy, at the same it is also more sensitive to matched filter, need well-designed matched filter.
In short, the representative Viterbi scheme of above three works in time-domain, complexity is higher or right
The factors such as modulation index value, frequency deviation, phase, matched filter are more sensitive.
Summary of the invention
In view of this, the embodiment of the present invention proposes a kind of two condition Viterbi detection system and method, to reduce system complex
Degree, improves the robustness of Sequence Detection.
In a first aspect, the embodiment of the invention provides a kind of two condition Viterbi detection system, the system comprises:
Time domain is transformed into frequency domain module, for the time-domain sample point signal of input to be converted to domain samples point signal；
Difference judging module, for obtaining decision bits and judgment variables；
Phase error computation module obtains decision error variable for calculating error；
Frequency domain two condition viterbi module；For obtaining revised judgement and missing to multiple decision error variable joint-detections
Poor variate-value；
Cache module, for storing decision bits, to match the processing delay of frequency domain two condition viterbi module introducing；
Decision bits correction module is modified decision bits using revised decision error variable.
Second aspect, the embodiment of the invention provides a kind of two condition witt ratio detection methods, which comprises
Frequency domain module is transformed into using time domain, and the time-domain sample point signal of input is converted into domain samples point signal；
Difference judgement is carried out to domain samples point signal using difference judging module, obtains decision bits and judgment variables；
By decision bits input buffer module, to match the processing delay of frequency domain two condition Viterbi introducing, then change will be adjudicated
Amount and decision bits are input to phase error computation module, to calculate decision error variable；
The decision error variable is input to frequency domain two condition viterbi module, is combined using multiple decision error variables and is examined
It surveys, obtains revised decision error variate-value, wherein the revised decision error variate-value is frequency domain two condition Wei Te
Than some trellis states could attribute of module；
Decision bits amendment mould is entered using the decision bits of revised decision error variable and cache module output
Block is modified, output amendment bit.
The advantages and positive effects of the present invention are: due to the adoption of the above technical scheme, both can get good detection
Performance, and system complexity can be reduced, it is also insensitive to factors such as h value, frequency deviation, phase, matched filters.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, of the invention other
Feature, objects and advantages will become more apparent upon:
Fig. 1 is the coherent receiver technical solution schematic diagram based on Laurent decomposition technique in the prior art；
Fig. 2 is the technical solution schematic diagram of the noncoherent receiver in the prior art based on Laurent decomposition technique；
Fig. 3 is the technical solution schematic diagram of receiver in PSP technology in the prior art；
Fig. 4 is the structure chart of two condition Viterbi detection system provided in an embodiment of the present invention；
Fig. 5 is the flow chart of two condition witt ratio detection method provided in an embodiment of the present invention；
Fig. 6 is the transmitter processes block diagram of bluetooth BDR mode and LE mode；
Fig. 7 is that the receiver of bluetooth BDR and LE mode handles block diagram；
Fig. 8 is the realization block diagram of the BDR mode of Bluetooth system and the two condition Viterbi detection technical solution of LE mode；
Fig. 9 is viterbi module grid map；
Figure 10 is that Bluetooth system uses the impact of performance schematic diagram after two condition witt ratio detection method.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
State that the specific embodiments are only for explaining the present invention, rather than limitation of the invention.It also should be noted that for the ease of
Description, only some but not all contents related to the present invention are shown in the drawings.
As shown in figure 4, a kind of two condition Viterbi detection system, comprising:
Time domain is transformed into frequency domain module 400, for the time-domain sample point signal of input to be converted to domain samples point letter
Number；
Difference judging module 401, for obtaining decision bits and judgment variables；
Phase error computation module 403 obtains decision error variable for calculating decision error；
Frequency domain two condition viterbi module 404；For obtaining revised judgement to multiple decision error variable joint-detections
Error variance value；
Cache module 402 is prolonged for storing decision bits with matching the processing of the introducing of frequency domain two condition viterbi module 504
When；
Decision bits correction module 405 is modified decision bits using revised decision error variable.
As shown in figure 5, the present invention provides a kind of two condition witt ratio detection method, method includes the following steps:
Step 1 S1: frequency domain module is transformed into using time domain, the time-domain sample point signal of input is converted into domain samples
Point signal；
Step 2 S2: using difference judging module to domain samples point signal carry out difference judgement, obtain decision bits and
Judgment variables；
Step 3 S3: by decision bits input buffer module, to match the processing delay of frequency domain two condition Viterbi introducing, then
Judgment variables and decision bits are input to phase error computation module, to calculate decision error variable；
Step 4 S4: the decision error variable is input to frequency domain two condition viterbi module, utilizes multiple decision errors
Variable joint-detection obtains revised decision error variate-value, wherein the revised decision error variate-value is frequency
Some trellis states could attribute of domain two condition viterbi module；
Step 5 S5: judgement ratio is entered using the decision bits of revised decision error variable and cache module output
Special correction module is modified, output amendment bit.
Below with reference to embodiment to the detailed description of the invention.
The BDR mode and LE mode of Bluetooth system are all made of GFSK mode and are modulated, as shown in fig. 6, the bit of input
Sequence initially enters two-phase PSK (Binary Phase Shift Keying, BPSK) module 600 and carries out BPSK mapping,
I.e. bit 0 is mapped as -1, and bit 1 is mapped as+1, carries out up-sampling operation subsequently into up-sampling module 601, i.e. duplication operation,
Assuming that up-sampling factor M=8, i.e., replicate input signal 7 times, obtain the identical sample point of 8 values after up-sampling altogether, then
It enters Gaussian pulse Shaping Module 602 and carries out the i.e. gaussian filtering operation of Gaussian pulse shaping, enter back into integration module 603 and phase
Position modulation module 604 integrated respectively, phase-modulation etc., is emitted until entering front end of emission 605 and obtaining transmitting signal to sky
In.
As shown in fig. 7, antenna receives radiofrequency signal from the air, coordinated device (Tuner) 700 is down-converted to intermediate frequency
(Intermediate frequency, IF) signal, then by analog-digital converter (Analog-digital Converter,
ADC) 701 digital signal is converted to, removes direct current (Direct Current, DC) component through DC Notch module 702, then through dropping
Frequency conversion (Down Conversion) module 703 is converted to base band, then low-pass filtered device (Low Pass Filter,
LPF) 704 out-of-band interference being filtered out, 705 pairs of reception signals of matched filter (Matchied Filte, MF) carry out Shape correction,
Automatic growth control (Automatic Gain Control, AGC) module 706 later obtains variable gain amplifier
(Variable Gain Amplifier, VGA) gain factor, feeds back to Tuner700；Next, time-domain signal enters
CORDIC module 707 obtains the phase value of input signal, enters back into difference block 708, the phase value of current sample point is subtracted
The phase value of a upper sample point obtains differential phase value；Give the differential phase sequence of acquisition to frequency domain two condition viterbi module
710, finally obtain revised bit sequence.Wherein, SNR detection module 709 provides symbol synchronization information.Since timing is same
Step module 709 has also used CORDIC and difference operation, and therefore, Fig. 8 frequency domain two condition viterbi module includes original Viterbi
Difference judgement, phase error computation, caching, frequency domain two condition Viterbi and decision bits correction module in block diagram.
As shown in figure 8, the embodiment of the invention provides a kind of Bluetooth system BDR modes and LE mode two condition Viterbi detection
System, the system include: to seek phase module 806, extract phase to the time-domain sample signal of input；Difference block 800, phase
It carries out difference operation and obtains differential phase；Wherein, phase module 806 and difference block 800 is asked to be transformed into frequency for the time domain in Fig. 4
Domain module 400, for the time-domain sample point signal of input to be converted to domain samples point signal；Difference judging module 801 is used
In acquisition decision bits and judgment variables；Phase error computation module 803 obtains decision error variable for calculating error；Frequently
Domain two condition viterbi module 804；For obtaining revised decision error variable to multiple decision error variable joint-detections
Value；Cache module 802, for storing decision bits, to match the processing delay of frequency domain two condition viterbi module introducing；Judgement ratio
Special correction module 805 is modified decision bits using revised decision error variable.
Wherein two condition witt ratio detection method:
As shown in figure 8, tangent can be used by asking the time-domain sample signal of 806 pairs of phase module inputs to extract phase
Function or CORDIC are realized, into difference block 800, carry out difference operation to phase, i.e., before subtracting the phase of current sample
The phase of one sample obtains differential phase, or is frequency；Differential phase value enters difference judging module 801, makes decisions,
The implementation of " difference judgement " module 801 is as follows:
The corresponding M differential phase value of one signal is mutually added up, or Partial Differential phase value is mutually added up, is obtained
It obtains judgment variables (dec_sig), the acquisition methods of decision bits (dec_bit) are as follows:
If dec_sig > 0, dec_bit=1；Otherwise, dec_bit=0.
Judgment variables and decision bits enter phase error computation module 803 and calculate phase error, " phase error computation "
The operating method of module 803 are as follows:
Decision bits (dec_bit) 0 or 1 are first mapped as-pi/2 or+pi/2 (dec_bit_phase), i.e., if dec_
Bit=1, dec_bit_phase=pi/2；If dec_bit=0, dec_bit_phase=-pi/2；
Judgment variables (dec_sig) are converted into value-pi/2 or+pi/2 ideally again, can be drawn under actual conditions
Enter many non-ideal factors, such as the deviation of interference, noise and modulation index h value, be denoted as dec_sig_phase, then phase is missed
The calculation formula of poor err_phase are as follows:
Err_phase=dec_sig_phase-dec_bit_phase.
The value range for ensuring all phases be [- pi ,+pi), i.e., if desired, the phase value after each operation should be carried out
The operation of 2 × pi of modulus, wherein dec_sig_phase=dec_sig/ (4 × h_mid), h_mid indicate intermediate modulation rope
Draw value.Such as LE mode, h_mid=0.50；For BDR mode, h_mid=0.315, if using Partial Differential phase
Value, should slightly correct formula.
Judgement phase error variable enters frequency domain two condition viterbi module 804 and is detected, specific detection method are as follows:
As shown in figure 9, including 2 states in grid figure, it is denoted as state S1 and S2 respectively, element with state index is respectively 1
With 2；The grid map can unfailingly extend down with the time, and Fig. 9 only gives the schematic diagram at two moment.Wherein, SM table
Showing i.e. state value, SM (T, S) indicates the state value of state S when moment T (particular moment), and T and S are all made of index value expression,
As SM (n-1,1) indicates the state value of moment T (n-1) (previous moment of particular moment), state S1.Wherein, BM indicates branch
Value, BM2=f (BM), i.e., carrying out some function processing to BM can be obtained BM2 value, for example:
BM2=| BM |；
BM2=BM × BM.
Function f () is dull liter even function.
BM (T, Sf, St) and BM2 (T, Sf, St) indicate moment T, from state Sf (State from), go to state
The finger values of St (State to) and the deformation values of finger values.Such as, BM2 (n, 1,1) indicate moment T (n), from state S1,
Go to the deformation values of the finger values of state S1.So, new state value, the i.e. solution of the state value of moment T (n) such as SM (n, 1)
Method is as follows:
SM (n, 1)=min (SM (n-1,1)+BM2 (n, 1,1), SM (n-1,2)+BM2 (n, 2,1)).
Define PM, Path Metric, i.e. path values, then:
PM (n, Sf, St)=SM (n-1, Sf)+BM2 (n, Sf, St).
SM (n, 1) can be write as:
SM (n, 1)=min (PM (n, 1,1), PM (n, 2,1)).
The smaller value in two PM values is taken, while writing down the corresponding state Sf of the smaller PM value, the i.e. hair of surviving branch
Source state, and the surviving branch is added in the corresponding survivor path of St state, as returning the path foundation chased after.
Wherein, the calculation method of BM is as follows:
BM (n, Sf, St)=EP (n)-V (St)+F × PR (n-1, Sf).
Wherein, EP (n) indicates the phase error (err_phase) of the module input of moment T (n), and V (St) indicates state St
Corresponding status attribute (e.g., 0 and-pi), F is invariant, and 0 < F < 1, PR indicate reference phase (Phase
Reference), PR (n-1, Sf) indicates moment T (n-1), the corresponding reference phase of state Sf.Wherein, the solution side of PR value
Method is as follows:
PR (n-1, Sf)=BM (n-1, Sf ', Sf).
State Sf ' therein is the source status of moment T (n-1), the corresponding surviving branch of state Sf.
When all SM value SM (n, 1) and SM (n, 2) for obtaining moment T (n), the smaller value in two SM values is taken, is write down
Its corresponding state chases after then according to the corresponding survivor path of the state by returning, and obtains at a certain time in the past (dependent on connection
Close the sequence length of detection) corresponding status attribute, e.g., 0 or-pi, using the status attribute as the output valve of moment T (n)
Viterbi_out, the corresponding status attribute of two states of " frequency domain two condition Viterbi " module 804 are 0 and-pi, or are 0 He
Pi, because pi is equal with-pi after 2 × pi of modulus；So, the output (viterbi_out) of frequency domain two condition viterbi module 804
It is worth or is 0 or is non-zero (- pi or pi).
During aforesaid operations, since PM value adds up always, in practical work process, overflows, can have more at last
Kind method prevents its spilling.A kind of method is to be changed to PM formula:
PM (n, Sf, St)=G × SM (n-1, Sf)+(1-G) × BM2 (n, Sf, St).
Wherein, G is an invariant, 0 < G < 1.
Another method is, during cumulative, cuts a variable, which has with past module input value
It closes, but has had exceeded the memory range of viterbi algorithm.
The decision bits that last revised decision error variable and cache module 802 export enter decision bits amendment
Module 805 is modified, and method is:
If viterbi_out is equal to 0, amendment the bit out_bit=dec_bit, dec_bit exported indicates process
Decision bits after delay；Otherwise, out_bit=1-dec_bit negates dec_bit.
As shown in Figure 10, performance of the invention has approached theoretical performance limit, and insensitive to h_mid, wherein
Using awgn channel, the sequence length of joint-detection is 5 bits, and BT mode is BDR mode, and the up-sampling factor is 8, in reality
During border is realized, due to hardware realization to be considered, h_mid is simultaneously not equal to 0.315.
The embodiments of the present invention have been described in detail above, but content is only the preferred embodiment of the present invention,
It should not be considered as limiting the scope of the invention.Any changes and modifications in accordance with the scope of the present application,
It should still be within the scope of the patent of the present invention.
The above description is only a preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For, the invention can have various changes and changes.All any modifications made within the spirit and principles of the present invention are equal
Replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (19)
1. a kind of two condition Viterbi detection system characterized by comprising
Time domain is transformed into frequency domain module, for the time-domain sample point signal of input to be converted to domain samples point signal；
Difference judging module obtains decision bits and judgment variables for carrying out difference judgement to domain samples point signal；
Judgment variables and decision bits are input to phase error computation module by phase error computation module, are missed with calculating judgement
Poor variable；
Frequency domain two condition viterbi module；For obtaining revised decision error and becoming to multiple decision error variable joint-detections
Magnitude；
Cache module, for storing decision bits, to match the processing delay of frequency domain two condition viterbi module introducing；
Decision bits correction module is entered using the decision bits that revised decision error variable is exported with cache module and is sentenced
Certainly bit correction module is modified, output amendment bit.
2. a kind of two condition Viterbi detection system according to claim 1, which is characterized in that the time domain is transformed into frequency
Domain module obtains differential phase to the time samples signal extraction phase of input, then difference operation first.
3. a kind of two condition Viterbi detection system according to claim 2, which is characterized in that the time domain is transformed into frequency
Domain module can be by tangent function or coordinate rotation digital computer come real to the time samples signal extraction phase of input
It is existing.
4. a kind of two condition Viterbi detection system according to claim 1, which is characterized in that the phase error computation
The calculation method of module is directed to binary Continuous Phase Modulation CPM signal.
5. a kind of two condition Viterbi detection system according to claim 2, which is characterized in that frequency domain two condition viterbi module
The corresponding status attribute of two states be 0 or-pi.
6. a kind of two condition Viterbi detection system according to claim 1 or 5, which is characterized in that the frequency domain two condition
Viterbi module output valve is 0 or-pi.
7. a kind of two condition witt ratio detection method characterized by comprising
Frequency domain module is transformed into using time domain, and the time-domain sample point signal of input is converted into domain samples point signal；
Difference judgement is carried out to domain samples point signal using difference judging module, obtains decision bits and judgment variables；
By decision bits input buffer module, to match the processing delay of frequency domain two condition Viterbi introducing, then by judgment variables and
Decision bits are input to phase error computation module, to calculate decision error variable；
The decision error variable is input to frequency domain two condition viterbi module, using multiple decision error variable joint-detections,
Obtain revised decision error variate-value, wherein the revised decision error variate-value is frequency domain two condition Viterbi
Some trellis states could attribute of module；
Using revised decision error variable and cache module output decision bits enter decision bits correction module into
Row amendment, output amendment bit.
8. a kind of two condition witt ratio detection method according to claim 7, it is characterised in that: the difference judging module
The method for obtaining decision bits and judgment variables includes:
The corresponding whole differential phase value of one signal are mutually added up, or Partial Differential phase value is mutually added up, are obtained
Judgment variables；
If judgment variables are greater than 0, decision bits 1；Otherwise, decision bits 0.
9. a kind of two condition witt ratio detection method according to claim 7, which is characterized in that the phase error computation mould
Block calculates decision error variable
Decision bits are mapped as-pi/2 or pi/2；
Judgment variables are mapped as-pi/2 to the mapping value between pi/2；
According to phase error computation formula err_phase=dec_sig_phase-dec_bit_phase, phase mistake is calculated
Difference, wherein err_phase indicates phase error, and dec_sig_phase indicates the mapping value of judgment variables under actual conditions,
The mapping value of dec_bit_phase expression decision bits.
10. a kind of two condition witt ratio detection method according to claim 7, which is characterized in that the phase error
Value range is-pi or more, is less than pi.
11. a kind of two condition witt ratio detection method according to claim 7 or 10, which is characterized in that the phase error
Computing module calculates decision error variable further include:
The operation of 2 × pi of mould is carried out to phase error.
12. a kind of two condition witt ratio detection method according to claim 7, which is characterized in that decision bits correction module
Method are as follows: if viterbi_out is equal to 0, out_bit=dec_bit, otherwise out_bit=1-dec_bit, wherein institute
The viterbi_out stated indicates the output valve of frequency domain two condition viterbi module, and the out_bit indicates the amendment ratio of output
Spy, the dec_bit indicate the decision bits after delay.
13. a kind of two condition witt ratio detection method according to claim 7, which is characterized in that frequency domain two condition Viterbi mould
Block obtain error variance method include:
Using grid, particular moment all state value is determined, take one the smallest in state value, write down its corresponding state；
It according to the corresponding survivor path of the state, is chased after by returning, obtains corresponding status attribute at a certain time in the past；
Output valve of the status attribute as particular moment.
14. a kind of two condition witt ratio detection method according to claim 13, which is characterized in that the particular moment takes
The smallest state value method are as follows: be worth the state value of previous moment and particular moment branch deformation values to be asked particular state
With；It sums the smallest for particular moment the smallest state value.
15. a kind of two condition witt ratio detection method according to claim 14, which is characterized in that the particular moment branch
Road deformation values are obtained by the function processing to finger values.
16. a kind of two condition witt ratio detection method according to claim 15, which is characterized in that the function is dullness
Even function.
17. a kind of two condition witt ratio detection method according to claim 15, which is characterized in that the finger values are pair
The difference and previous moment of the phase error status attribute corresponding with state of going to of particular moment input are corresponding from state
Reference phase and the product of invariant sum.
18. a kind of two condition witt ratio detection method according to claim 17, which is characterized in that the invariant
Value range is greater than 0, less than 1.
19. a kind of two condition witt ratio detection method according to claim 17, which is characterized in that current reference phase
Equal to the finger values of previous moment.
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| CN114640562B (en) * | 2022-03-16 | 2023-05-30 | 中山大学 | Incoherent demodulation method for CPFSK/GFSK signals |
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| CN101047687A (en) * | 2006-03-30 | 2007-10-03 | 恩益禧电子股份有限公司 | Receiving circuit and receiving method |
| CN101808068A (en) * | 2009-10-29 | 2010-08-18 | 清华大学 | Method and system for MSK iterative demodulation by combining LDPC code |
| CN102148681A (en) * | 2011-05-19 | 2011-08-10 | 北京邮电大学 | System and method for realizing iterative timing synchronization of continuous phase modulation signal |
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