CN105530078A - Communication packet burst detection method and communication packet burst detection device for receiver - Google Patents
Communication packet burst detection method and communication packet burst detection device for receiver Download PDFInfo
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Abstract
The invention relates to a communication packet burst detection method for a receiver and a communication packet burst detection device for a receiver. The method comprises steps that, an input signal is received; a training sequence is received; the training sequence is filtered to acquire a training signal, and filtering simulation is carried out through means including an emission processing module and an emission front end of an emitter, a transmission channel, and an equivalent transmission channel of a reception front end of a receiver; relevant sliding operation on the input signal and the training signal is carried out, and burst detection indication signals and satellite information are acquired.
Description
Technical field
The present invention relates to the simultaneous techniques field in physical layer receiver, especially relate to communications packet burst detection method and device.
Background technology
The traditional burst of the communications packet based on training sequence detection technique is generally divided into two classes, Autocorrelation Detection technology and cross-correlation test technology.The communication system that Autocorrelation Detection technology is suitable for generally needs to send two sections or multistage at transmitting terminal and repeats or relevant training signal, it reduces efficiency of transmission.
The known burst of the communications packet based on cross-correlation test device detection technique scheme is with reference to shown in figure 1.Input signal is wherein the wireless signal of the implicit training sequence that receiver receives, this signal is sent by transmitter, via the process of channel, tuner, receiver AD converter (ADC) and other a series of receiving front-end processing module, finally arrive communications packet burst detection module 10.Training sequence in communications packet burst detection module 10 comes from outside input (as the training sequence that upper-layer protocol provides) or is stored in local memory space (as read-only memory or flash memory).This training sequence is identical with the part list entries of the transmitting processing module of transmitting terminal, and the concrete manifestation form of training sequence can be bit sequence or sequence of values (real number or plural number).Communications packet burst detection module 10 has cross-correlator 11, its method of operation is that the signal of input and training sequence signal are carried out slip associative operation, gets the original position that position input signal index value corresponding to maximum related value in certain hour is communication packet header.If the detection index signal of cross-correlator 11 comprises whether detect that communication packet header is detected successfully, provide concrete communication packet header sample point position, and other attached synchronization related information (as initial Nonlinear Transformation in Frequency Offset Estimation value) etc.Cross-correlator 11, carrying out sliding in relevant process, may need to carry out some attaching operations, and as estimated initial frequency offset value, this is conducive to the correctness of slip associative operation.
But find that the detection perform of above-mentioned known burst detection technique scheme is not ideal in practice.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of communications packet burst detection method and device of receiver, has the detection perform of lifting.
The present invention be solve the problems of the technologies described above the technical scheme adopted be propose a kind of communications packet burst detection method, for a receiver, the method comprises the following steps: receive an input signal; Receive a training sequence; Carry out filtering to obtain a training signal to this training sequence, this filtered analog comprises the effective transmission channel of the transmitting processing module of transmitter and the receiving front-end of front end of emission, transmission channel and receiver; And slip associative operation is carried out to this input signal and this training signal, obtain detection index signal and the satellite information of burst detection.
In one embodiment of this invention, also comprise before filtering is carried out to this training sequence, preliminary treatment is carried out to this training sequence.
In one embodiment of this invention, this preliminary treatment comprises bit mapping and up-sampling.
In one embodiment of this invention, this filtering has the optional filter factor of many groups, respectively for different effective transmission channels.
In one embodiment of this invention, said method also comprises and from many group filter factors, selects one group of filter factor according to a control signal.
In one embodiment of this invention, said method also comprises this filter factor of online updating.
The present invention also proposes a kind of communications packet burst checkout gear, and for a receiver, this device comprises first memory, filter and cross-correlator.First memory stores training sequence.Filter connects this first memory, and carry out filtering to obtain a training signal to this training sequence, this filtered analog comprises the effective transmission channel of the transmitting process of transmitter and the receiving front-end of front end of emission, transmission channel and receiver.Cross-correlator connects this filter, carries out slip associative operation to an input signal and this training signal, obtains detection index signal and the satellite information of burst detection.
In one embodiment of this invention, this first memory stores multiple training sequence, and selects a training sequence to export this filter to according to a control signal.
In one embodiment of this invention, said apparatus also comprises second memory, stores multicomponent safety pin to the filter factor of different effective transmission channels, and selects one group of filter factor to export this filter to according to a control signal.
In one embodiment of this invention, said apparatus also comprises pretreatment module, is connected between this first memory and this filter, carries out preliminary treatment to this training sequence.
The present invention is owing to adopting above technical scheme, make it compared with prior art, because the training sequence of receiving terminal is after extracting, experienced by the filtering of the effective transmission channel of the training sequence of analog transmissions end, significant difference between two training sequences is reduced, therefore can to slide the accuracy of associative operation, thus to improve the accuracy that burst detects.
Accompanying drawing explanation
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 illustrates the known communications packet burst detection method based on cross-correlation test device.
Fig. 2 illustrates effective transmission channel according to an embodiment of the invention.
Fig. 3 illustrates the burst of the communications packet based on the cross-correlation test device checkout gear of one embodiment of the invention.
Fig. 4 illustrates the communications packet burst detection method based on cross-correlation test device of one embodiment of the invention.
Fig. 5 illustrates the packet format according to the present invention one example.
Fig. 6 illustrates the access code form of packet format shown in Fig. 5.
Fig. 7 illustrates the packet format according to another example of the present invention.
Fig. 8 illustrates the transmitter processes flow process according to the present invention one example.
Fig. 9 illustrates the receiver handling process according to the present invention one example.
Figure 10 illustrates the communications packet burst testing process according to the present invention one example.
Figure 11 illustrate phase difference operation after training signal and desirable training sequence between contrast effect.
Embodiment
The following examples will describe the receiver communications packet burst detection technique scheme of the present invention's proposition in detail.Receiver in the embodiment of the present invention is applicable to comprise the communication system that GFSK (GaussfrequencyShiftKeying, Gaussian Frequency Shift Keying) modulates, such as gsm system, Bluetooth system.
Find that the poor main cause of known communications packet burst detection scheme detection perform is, although the training sequence of receiving terminal is identical with the part list entries (i.e. training sequence) of the transmitting processing module of transmitting terminal, training sequence (i.e. the input training sequence of the detection module) difference of not launching of the training sequence launched with initial after a series of process and transmission is larger.Carry out slip with the burst that two difference are larger to be correlated with, add the impact of noise, will detection perform be had a strong impact on, then the transmission performance of influential system.That is, known communications packet burst detection scheme fails to consider the impact of processing links (comprise and launch process, front end of emission, receiving front-end etc.) and transmission channel; When the situation difference of processing links and transmission channel and expectation is larger, will cause detecting unsuccessfully; Even if when the situation difference of processing links and transmission channel and expectation is little, the detection perform of traditional detection scheme is also poor, especially when the operation signal to noise ratio (SNR) of system is lower, the performance of burst detection module even determines the performance of whole system, because the performance of whole system is decided by the performance of the detection sample point deviation in communication packet header sometimes.
Thus, embodiments of the invention introduce effective transmission channel.Fig. 2 illustrates effective transmission channel according to an embodiment of the invention.Shown in figure 2, radio frequency processing module 21 and front end of emission 22 belong to transmitter 20, and receiving front-end 24, burst detection module 25 and receiving processing module 26 belong to receiver 27.Transmission channel 23 is between transmitter 20 and receiver 27.Sending sequence (such as comprising training sequence) can through launching processing module 21, front end of emission 22, transmission channel 23 and receiving front-end 24, arrive burst detection module 25, then cross-correlation is done with the training sequence of receiver 27, subsequently by receiving processing module 26 output detections sequence.In the context of the present invention, the comprehensive effect launching processing module 21, front end of emission 22, transmission channel 23 and receiving front-end 24 is called effective transmission channel.The operating procedure of launching processing module 21 can comprise the operations such as bit mapping, modulation, filtering, and wherein a part of operating procedure can be referred to as transmitting preliminary treatment.The treatment step of front end of emission 22 can comprise digital to analogy converter (DAC), analog filter, upconverter, amplifier etc., includes the impact of some non-ideal factors.Transmission channel 23 can comprise all kinds of wired or wireless channel, as additive white Gaussian noise channel (AWGN), multipath channel etc.Receiving front-end 24 can comprise tuner, AD converter (ADC), some digital received processing apparatus as low pass filter, matched filter, remove direct current (DC) device, demodulator etc., include the impact of some non-ideal factors.Be appreciated that, although only transmitting processing module 21, front end of emission 22, transmission channel 23 and receiving front-end 24 are referred to as effective transmission channel at this, if but sequence occurs experienced by more processing links from transmitting terminal to receiving terminal, then effective transmission channel may further include these processing links.
Continue the process describing transmitter 20 and receiver 27 with reference to figure 2.Send sequence and (comprising training sequence) bit sequence or sequence of values (real number or plural number) can be shown as, enter launch processing module 21 carry out a series of signal transmitting before process, as operations such as bit mapping, modulation, filtering; After through launch processing module 21 process after signal enter front end of emission 22, carry out digital signal to analog signal conversion, analog filtering, upconvert to the operation such as radio frequency, radio frequency amplification.The treatment step of receiver 27 is, wireless or the wire signal received from transmission channel 23 is first through the process of tuner (Tuner), be transformed to base band or intermediate frequency (IF) signal, enter ADC again and be converted to digital signal, then carry out the process of a series of digital received front end 24, as low-pass filtering, matched filtering, remove DC, down-sampling, be down-converted to the operation such as base band, demodulation; Then burst detection module 25 is entered, capture the packet header of communications packet, and obtain some other satellite information, finally carry out reception process as the step such as bit-detection, information trace, finally obtain and detect sequence, bit sequence or other real number or sequence of complex numbers (as voice signal etc.) can be embodied in.
Consider the impact of effective transmission channel, and with the difference of actual transmission channel (i.e. the transmission channel of upper figure), the present invention proposes a kind of new receiver communications packet burst detection technique device.Fig. 3 illustrates the burst of the communications packet based on the cross-correlation test device checkout gear of one embodiment of the invention.Shown in figure 3, burst checkout gear 30 can comprise pretreatment module 31, filter 32, cross-correlator 33, first memory 34 and second memory 35.The input of pretreatment module 31 connects first memory 34, and the output of pretreatment module 31 is connected to an input of filter 32.Another input of filter 32 connects the output of second memory 35.The output of filter 32 connects an input of cross-correlator 33, another input access input signal of cross-correlator 33.The output output detections index signal of cross-correlator 33.
Operationally, training sequence first through the pretreatment operation of pretreatment module 31, then enters filter 32 and carries out convolution operation, obtains filtered training sequence (can be described as training signal).Then utilize training signal and input signal to be in sliding cross-correlation at cross-correlator 33 to operate, obtain detection index signal and some other satellite information that burst detects.Pretreatment module 31 is responsible for the action required that training sequence carries out before filtering.Pretreated operation specifically can depend on the circumstances, and it is such as bit mapping, up-sampling (as replication theme) etc. usually.
In the present embodiment, training sequence is stored in first memory 34.Training sequence can have one or more sets.When storing multiple sets training sequence, carry out the selection of controlled training series by control signal.
Filter 32 simulates the effect of aforementioned effective transmission channel.Filter 32 can configure one or more groups filter factor, respectively for different equivalent transmission channel environment.In the present embodiment, filter factor can be stored in second memory 35.When storing many group filter factors, control the selection of filter factor by control signal.
First memory 34 and second memory 35 can be embodied as EEPROM, ROM or Flash respectively.And preferably, second memory 35 can online updating filter factor as required.First memory 34 and second memory 35 can be equipped with data read and write interface respectively, to read or to write the content of its inside.
Impulse response representated by filter factor correspond to transfer function or the impulse response of effective transmission channel, therefore carries out the process that namely filtering operation is equivalent to carry out effective transmission channel.Features that transmission channel due to reality always has some fixing, as awgn channel, its transfer function can be similar to be thought and equals a constant as 1 (not considering the other factorses such as time delay); Also have some multipath channels, due to its time delay expansion relative very little (relative to the system symbol cycle), also can be similar to and think that its transfer function is a constant.Now can adopt the effect of filtering operation analog equivalent transmission channel well.Certainly, under extreme case, transmission channel may change too large, even irregular.Now filter factor can be set to a constant as 1, namely be equivalent to there is no the effect of filtering.
Get back to shown in Fig. 2, be standard process and the different implementation difference of front end of emission 22 is also little owing to launching processing module 21, transmission channel 23 has rule, the treatment step of receiving front-end 24 is known, and therefore we can obtain the filter factor reflecting effective transmission channel response by off-line (off-line).Concrete acquisition pattern includes but not limited to theory deduction and emulation.Obtaining a kind of method of filter factor by emulation is add a long full 0 sequence again by adding+1 sample value after launching pretreated burst and being set to a long full 0 sequence, as 0000 ... 0001000 ... 000, then carry out total system process, the non-zero value signal that the one section of front and back obtained in receiving front-end 24 output of receiver 27 are one section, the centre of full 0 signal is filter factor.Certainly trimming operation can also be carried out to filter factor.
In an embodiment of the present invention, preprocessor 31, filter 32, cross-correlator 33 etc. all realize by ASIC or dsp program.
Fig. 4 illustrates the communications packet burst detection method based on cross-correlation test device of one embodiment of the invention.Shown in figure 4, the method comprises the steps:
In step 401, receiver receives an input signal.Such as, receiver receives an input signal from transmission channel.
In step 402, receiver receives a training sequence.
In step 403, carry out filtering to obtain a training signal to training sequence, this filtered analog comprises the effective transmission channel of the transmitting processing module of transmitter and the receiving front-end of front end of emission, transmission channel and receiver.
In step 404, slip associative operation is carried out to this input signal and this training signal, obtain output detections index signal and the satellite information of burst detection.
Preferably, before carrying out filtering to training sequence, (between step 402 and step 403) also can comprise, and carries out preliminary treatment to this training sequence.Preliminary treatment such as comprises bit mapping and up-sampling.
In step 403, for different effective transmission channels, one group of filter factor can be selected from the optional filter factor of many groups.For example, one group of filter factor can be selected according to a control signal from many group filter factors.In addition, be preferably can online updating for these filter factors.
Below for bluetooth BDR (BasicDataRate) and/or LE (LowEnergy) pattern, describe enforcement example of the present invention in detail.
The BDR pattern of bluetooth (Bluetooth) system and LE pattern all adopt GFSK mode to modulate, and difference has 2 points:
1, the modulationindex span of BDR pattern is h=0.28-0.35, and the modulationindex span of LE pattern is h=0.45-0.55;
2, the packet format of the two is different, shown in concrete reference diagram 5 and Fig. 7.Influential to the detection module that happens suddenly is that the two training sequence length is different.
Fig. 5 is the packet format of BDR pattern, shown in Format Reference Fig. 6 of wherein access code (accesscode).We are that the SYNCWORD of 64 bits is as training sequence using getting wherein length.In fact, the burst under EDR (EnhancedDataRate) pattern detects and also utilizes SYNCWORD to complete.
Fig. 7 gives the packet format of LE pattern.We will get wherein length is that the accessaddress of 32 bits (4octets) is as training sequence.
Fig. 8 illustrates the transmitter processes flow process according to the present invention one example, is applicable to the transmitter of bluetooth BDR pattern and/or LE pattern.Shown in figure 8, first the bit sequence (containing training sequence) of input carries out transmitting process, (namely bit 0 is mapped as-1 to comprise BPSK mapping 801, bit 1 is mapped as+1), with up-sampling operation 802 (i.e. copy operations, suppose up-sampling factor F=8,7 times are copied by input signal, the identical sample point of 8 values is obtained altogether) after up-sampling, then Gaussian pulse shaping 803 (i.e. gaussian filtering operation) is carried out successively, carry out integration 804, phase-modulation 805 etc. again, until enter front end of emission to obtain the transmitting that transmits in the air.Generate at above-mentioned off-line in the citing of filter factor, the burst being about to enter Gaussian pulse shaping 803 is set to 000 ... 0001000 ... 000.
The wireless channel time delay expansion of Bluetooth system is very little relative to symbol period (1 μ s), is generally ns level, therefore generally can be approximately awgn channel.
Fig. 9 illustrates the receiver handling process according to the present invention one example, is applicable to the receiver of bluetooth BDR pattern and/or LE pattern.Shown in figure 9, antenna receives radiofrequency signal from air interface, IF (intermediate frequency) signal is down-converted to through tuner 901, then digital signal is converted to through ADC902, DC component is removed through going direct current (DCNotch) module 903, base band is down-converted to again in low-converter 904, then disturb outward through low pass filter 905 filter out-band, Shape correction is carried out to received signal through matched filter 906 (MF), automatic growth control (AGC) module 907 afterwards obtains gain factor, feeds back to tuner 901; Next, utilize Coordinate Rotation Digital algorithm (CoordinateRotationDigitalComputer, CORDIC) module 908 obtains the phase value of input signal, enter difference block 909 again, the phase value of current sample point is deducted the phase value of a upper sample point, obtain differential phase value.Module 901-909 is referred to as receiving front-end.
The differential phase value of acquisition is carried out burst at burst detection module 910 detect, utilize burst to detect the synchronizing information obtained and carry out follow-up reception process at receiving processing module 911, finally obtain the bit sequence detected.
Figure 10 illustrates the communications packet burst testing process according to the present invention one example.With reference to shown in Figure 10, the process block diagram of burst detection module is: first utilize input signal to carry out initial frequency deviation estimation at frequency offset estimator 101, because input signal is now phase difference signal, frequency deviation is just equivalent to a DC component; After estimating initial frequency deviation, going frequency deviation device 102 to be removed the frequency deviation value that estimates, and then entering cross-correlator 103 and to be in sliding cross-correlation operation; On the other hand, training sequence carries out the preliminary treatment comprising BPSK mapping and copy up-sampling operation in pretreatment module 104, then carry out filtering through filter 105, filter factor can be the shock response sequence of the effective transmission channel that off-line obtains.Then utilize follow-up threshold judgement device 106 and detect logical one 07, just can obtain the synchronizing informations such as the whether successful and concrete position, packet header of detection.
In the preferred embodiment, in threshold judgement device 104, use counter to upgrade as judgment condition, prevent erroneous judgement certainly.
Figure 11 give phase difference operation after training signal and desirable training sequence between contrast effect, channel is awgn channel.Can find out, effective transmission channel is still larger on the impact of training sequence, the contrast effect (noiseless) that this still obtains when comparatively ideal effective transmission channel; And the training signal that the burst detection scheme of the embodiment of the present invention obtains is almost consistent with phase difference signal.
Generally, the net synchronization capability of the new communications packet burst detection scheme that the embodiment of the present invention proposes is much more outstanding than traditional scheme, for example h=0.50 under BTLE pattern, SNR=8dB, during 8 times of up-samplings, the error range of traditional scheme is-2 ~+2 sample points, and the error range of new departure is-1 ~+1 sample point; Other attached synchronizing information is as also accurately a lot of in initial frequency deviation estimated value.
Although the present invention discloses as above with preferred embodiment; so itself and be not used to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little amendment and perfect, therefore protection scope of the present invention is when being as the criterion of defining with claims.
Claims (10)
1. a communications packet burst detection method, for a receiver, the method comprises the following steps:
Receive an input signal;
Receive a training sequence;
Carry out filtering to obtain a training signal to this training sequence, this filtered analog comprises the effective transmission channel of the transmitting processing module of transmitter and the receiving front-end of front end of emission, transmission channel and receiver; And
Slip associative operation is carried out to this input signal and this training signal, obtains detection index signal and the satellite information of burst detection.
2. the method for claim 1, is characterized in that, also comprises, carry out preliminary treatment to this training sequence to this training sequence before carrying out filtering.
3. method as claimed in claim 2, it is characterized in that, this preliminary treatment comprises bit mapping and up-sampling.
4. the method for claim 1, is characterized in that, this filtering has the optional filter factor of many groups, respectively for different effective transmission channels.
5. method as claimed in claim 4, is characterized in that, also comprises and from many group filter factors, selects one group of filter factor according to a control signal.
6. the method as described in claim 1 or 4, is characterized in that, also comprises this filter factor of online updating.
7. a communications packet burst checkout gear, for a receiver, this device comprises:
First memory, stores training sequence;
Filter, connects this first memory, and carry out filtering to obtain a training signal to this training sequence, this filtered analog comprises the effective transmission channel of the transmitting process of transmitter and the receiving front-end of front end of emission, transmission channel and receiver; And
Cross-correlator, connects this filter, carries out slip associative operation to an input signal and this training signal, obtains detection index signal and the satellite information of burst detection.
8. device as claimed in claim 7, it is characterized in that, this first memory stores multiple training sequence, and selects a training sequence to export this filter to according to a control signal.
9. device as claimed in claim 7, is characterized in that, also comprise second memory, stores multicomponent safety pin to the filter factor of different effective transmission channels, and selects one group of filter factor to export this filter to according to a control signal.
10. device as claimed in claim 7, is characterized in that, also comprise pretreatment module, be connected between this first memory and this filter, carry out preliminary treatment to this training sequence.
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Application publication date: 20160427 |