CN113872635B - Method and system for tracking burst signal suitable for variable spreading factor modulation - Google Patents
Method and system for tracking burst signal suitable for variable spreading factor modulation Download PDFInfo
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Abstract
The invention discloses a method for tracking burst signals suitable for variable spreading factor modulation of micropower wireless communication, which comprises the following steps: s1: carrying out carrier stripping on the received burst signal after the down conversion to obtain a quasi baseband signal; s2: caching the quasi baseband signal to obtain cache data, and selecting the cache data with corresponding length according to the spread spectrum factor; s3: performing despreading processing on the selected cache data; s4: carrying out sectional correlation on the despread data and calculating an integral result; s5: estimating errors of carrier frequency and code phase according to the integral result, and filtering the errors; s6: and adjusting the tracking parameters, and using the adjusted tracking parameters at least for updating the tracking parameters adopted when the steps S2 and S3 are executed. The method and the system can be used for despreading different spreading sequences in the wireless burst signals, and simultaneously, the low-power-consumption design is adopted.
Description
Technical Field
The invention relates to the technical field of spread spectrum wireless communication, in particular to a tracking method and a tracking system for a burst signal modulated by a variable spread spectrum factor suitable for micro-power wireless communication.
Background
The direct sequence spread spectrum technology has the advantages of interference resistance, multipath resistance, good concealment and the like, and is widely applied to the field of wireless communication. The receiver can normally receive signals when the wireless signal transmission distance is long, but the effective data rate of wireless communication transmission is reduced. Conversely, a shorter spreading sequence length is used to transmit a signal with a higher data rate, but the signal transmission distance is also shorter. With the increasingly complicated application environment, it is important to design and receive wireless signals with different transmission distances, and in addition, the requirement of low power consumption needs to be considered.
The above background disclosure is only for the purpose of assisting understanding of the concept and technical solution of the present invention and does not necessarily belong to the prior art of the present patent application, and should not be used for evaluating the novelty and inventive step of the present application in the case that there is no clear evidence that the above content is disclosed at the filing date of the present patent application.
Disclosure of Invention
The present invention is directed to provide a method and a system for tracking a burst signal modulated by a variable spreading factor for micropower wireless communication, which can despread different spreading sequences in the burst signal and adopt a low power consumption design.
In order to realize the purpose, the invention adopts the following technical scheme:
one embodiment of the invention discloses a method for tracking a burst signal modulated by a variable spreading factor and suitable for micro-power wireless communication, which is characterized by comprising the following steps of:
s1: carrying out carrier stripping on the received burst signal after the down conversion to obtain a quasi baseband signal;
s2: caching the quasi baseband signal to obtain cache data, and selecting the cache data with corresponding length according to the spread spectrum factor;
s3: performing despreading processing on the selected cache data;
s4: carrying out sectional correlation on the despread data and calculating an integral result;
s5: estimating errors of carrier frequency and code phase according to the integral result, and filtering the errors;
s6: and adjusting tracking parameters, and using the adjusted tracking parameters at least for updating the tracking parameters adopted when executing the steps S2 and S3, wherein the tracking parameters include but are not limited to spreading factors, starting addresses of cache data, lengths of the cache data, periods of calculating integration results, and noise bandwidths of filtering processing.
Preferably, step S3 specifically includes: performing correlation processing on the selected cache data and a locally generated pseudo code sequence to complete de-spreading processing on the selected cache data; wherein the locally generated pseudocode sequences comprise pseudocode sequences of an immediate branch, a advance branch and a delay branch generated in dependence on the current spreading factor.
Preferably, step S6 specifically includes:
s61: firstly, initializing a spread spectrum factor according to a coding structure of an initial frame given by a burst signal, and initializing a cache initial address;
s62: configuring an integration period, a noise bandwidth of a filter, and a data length in step S2 based on the spreading factor;
s63: tracking the spread spectrum factor modulation signal, and calculating the number of data bits analyzed by tracking the spread spectrum factor according to the currently configured integration period after each tracking is finished, and updating a cache initial address;
s64: and comparing the number of the data bits modulated by the spreading factor, which is informed by the burst signal, or the number of the data bits analyzed from the collected data bit sequence to the number of the data bits tracked and analyzed in the step S63, judging whether the tracking of the spreading factor modulation signal is finished, if not, repeating the steps S63-S64, and if so, repeating the steps S62-S64 after configuring the spreading factor of the next frame.
Preferably, the updating the cache start address in step S63 specifically includes: and configuring the cache start address of the next acquired data as the sum of the current cache start address, the data length configured in the step S62 and the code phase error filtered in the step S5.
Preferably, in the step S64 of configuring the spreading factor of the next frame, the spreading factor of the next frame is obtained from the spreading factor sequence notified by the burst signal or is parsed from the sequence of the collected data bits.
Preferably, step S3 specifically includes: performing correlation processing on the selected cache data and a locally generated pseudo code sequence to complete despreading processing on the selected cache data; the step of locally generating the pseudo code sequence is to generate a local pseudo code sequence according to the spreading factor in step S62, and if it is determined in step S64 that the tracking of the current spreading factor modulated signal is not completed, the generated local pseudo code sequence remains unchanged.
Another embodiment of the present invention discloses a tracking system for a burst signal modulated by a variable spreading factor suitable for micropower wireless communication, which is characterized by comprising a coherent demodulation module, a data buffer module, a despreading module, an integral calculation module, a tracking processing module and a tracking control module, wherein:
the coherent demodulation module receives the burst signal after the down-conversion, and carries out carrier stripping on the received burst signal after the down-conversion to obtain a quasi-baseband signal which is sent to the data cache module;
the data caching module caches the quasi baseband signal to obtain cached data, and selects the cached data with the corresponding length according to the spread spectrum factor to send the cached data to the despreading module;
the de-spreading module is used for de-spreading the selected cache data and sending the de-spread data to the integral calculation module;
the integral calculation module carries out sectional correlation on the despread data, calculates an integral result and sends the integral result to the tracking processing module;
the tracking processing module estimates errors of carrier frequency and code phase according to the integral result and carries out filtering processing on the errors;
the tracking control module adjusts tracking parameters, and uses the adjusted tracking parameters at least for updating the tracking parameters adopted in the data caching module and the despreading module, wherein the tracking parameters include but are not limited to spreading factors, starting addresses of cached data, lengths of cached data, periods of calculation integration results, and noise bandwidths of filtering processing.
Preferably, the tracking system further includes a local pseudo code generating module, where the local pseudo code generating module is configured to receive the spreading factor adjusted by the tracking control module, generate a pseudo code sequence according to the spreading factor, and send the pseudo code sequence to the despreading module, where the pseudo code sequence includes pseudo code sequences of an immediate branch, a leading branch, and a delaying branch, which are generated according to a current spreading factor.
Preferably, the despreading module correlates the selected buffered data with the pseudo code sequence to complete despreading processing on the selected buffered data.
Preferably, the tracking system further includes a local carrier generation module, and the local carrier generation module is configured to receive the frequency error filtered by the tracking processing module, update the frequency of the local carrier according to the frequency error filtered by the filtering processing module, and send the updated frequency of the local carrier to the coherent demodulation module.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention can adapt to continuous tracking of modulation signals with different spreading factors, automatically adjust tracking parameters, adjust the error method of estimating tracking frequency according to the tracking parameters, and filter the error by adopting a loop filter, thereby having high tracking sensitivity and supporting larger time precision requirement.
2. The invention ensures that the initial code phase of the selected cache data is always kept consistent at different moments by adjusting the initial address of the selected cache data, thereby simplifying the complexity of a local pseudo code generation module and having the advantage of low tracking power consumption.
Drawings
Fig. 1 is a flow chart of a tracking method of a variable spreading factor modulated burst signal suitable for micro-power wireless communication according to a preferred embodiment of the present invention;
FIG. 2 is a graph of instantaneous branch I/Q amplitude tracking for a variable spreading factor signal in accordance with an embodiment of the present invention;
fig. 3 is a block diagram of a tracking system for a variable spreading factor modulated burst signal in micro-power wireless communication according to another preferred embodiment of the present invention.
Detailed Description
The invention will be further described with reference to the drawings and preferred embodiments.
As shown in fig. 1, a preferred embodiment of the present invention discloses a method for tracking a burst signal modulated by a variable spreading factor for micropower wireless communication, which is characterized by comprising the following steps:
s1: sending the burst signal after down-conversion to a coherent demodulation module, and changing the burst signal into a quasi-baseband signal after carrier stripping and sending the quasi-baseband signal to a data caching module;
s2: the data buffer module is used for buffering the quasi-baseband signals, selecting the signal Sn with the length of SLen with a given length from the buffer starting address SAddr and sending the signal Sn to the de-spreading module;
s3: the despreading module carries out correlation processing on the signal Sn and the pseudo code sequence generated by the local pseudo code generating module to complete despreading of the signal Sn, and the despread signal is sent to the integral calculating module;
s4: the integral calculation module calculates an integral result after performing segmented accumulation on the related data and sends the integral result to the tracking processing module;
s5: the tracking processing module estimates the error of the current carrier frequency and the code phase according to the integral result and carries out filtering processing on the error;
s6: the tracking control module adjusts tracking parameters including, but not limited to, spreading factor SF, data buffer start address SAddr and length SLen, noise bandwidth of loop filter and integration period.
Further, step S6 specifically includes:
s61: firstly, initializing a spreading factor SF according to a coding structure of an initial frame given by a burst signal, and initializing a cache initial address SAddr;
s62: configuring an integration period, a noise bandwidth of a filter, and a data length SLen in step S2 based on the spreading factor SF;
s63: tracking a spread Spectrum Factor (SF) modulation signal, calculating the number BitCnt of data bit analyzed by tracking the spread Spectrum Factor (SF) according to the currently configured integration period after each tracking is finished, and updating a cache initial address SAddr;
the method for updating the cache start address SAddr comprises the following steps: the buffer start address SAddr of the next acquired data is configured as the sum of the current buffer start address, the data length sen configured in step S62, and the code phase error filtered in step S5.
S64: and comparing the quantity of the data bits modulated by the spreading factor SF, which is informed by the burst signal, or the quantity of the data bits modulated by the spreading factor SF, which is analyzed from the collected data bit sequence, with the quantity of the data bits BitCnt which is tracked and analyzed in the step S63, judging whether the tracking of the spreading factor SF modulation signal is finished, if not, repeating the steps S63-S64, and if so, configuring the spreading factor of the next frame and then repeating the steps S62-S64.
The spreading factor of the next frame is configured, and the spreading factor SF of the next frame can be obtained from the spreading factor sequence notified by the burst signal or can be resolved from the sequence of the collected data bits.
In step S3, the local pseudo code generation module generates a local pseudo code sequence according to the spreading factor SF in step S62, and if it is determined that the tracking of the modulation signal of the spreading factor SF is not completed, the spreading factor SF is not changed, and the local pseudo code sequence may remain unchanged.
The preferred embodiment of the invention is suitable for a direct sequence spread spectrum system, simplifies the generation of local pseudo codes by selecting and processing input signals, supports the tracking of burst signals with different data rates, and has the characteristics of high tracking sensitivity and low power consumption.
As shown in fig. 1, an embodiment of the present invention provides a method for tracking a burst signal modulated by a spreading factor for micropower wireless communication, including the following steps:
s1: sending the burst signal after down-conversion to a coherent demodulation module, and changing the burst signal into a quasi-baseband signal after carrier stripping and sending the quasi-baseband signal to a data caching module;
s2: the data buffer module is used for buffering the quasi-baseband signal, selecting a signal Sn with a given length SLen from a buffer starting address SAddr and sending the signal Sn to the de-spread module;
s3: the despreading module carries out correlation processing on the signal Sn and the pseudo code sequence generated by the local pseudo code generating module to finish despreading the signal Sn, and the despread signal is sent to the integral processing result module;
the method specifically comprises the steps that a local pseudo code generation module generates pseudo code sequences of an instant branch, an advance branch and a delay branch according to a current spreading factor SF, and signals Sn are respectively related to the pseudo code sequences of the instant branch, the advance branch and the delay branch.
S4: the integral calculation module calculates an integral result after performing segmented accumulation on the related data and sends the integral result to the tracking processing module;
specifically, each path of correlation result can be divided into 8 segments, the length of each segment is marked as L, and the segment correlation results are as follows:
The integral result can be calculated in time domain or in frequency domain according to the tracking parameters, the integral result in time domain is accumulated in time domain, and the integral result in instant branch is recorded as X P The integration result of the delay branch is marked as X L The integration result of the look-ahead branch is marked as X E 。
S5: the tracking processing module estimates the error of the current carrier frequency and the code phase according to the integral result and carries out filtering processing on the error;
specifically, an instantaneous branch integration result X is adopted P Calculating a frequency error; integration X with leading branch E And delay branch integral X L The code phase error is calculated.
And filtering the carrier frequency error, adjusting the parameters and the order of the filter according to the tracking parameters, and feeding the filtered frequency error back to the local carrier generation module for updating the local carrier frequency.
And filtering the code phase error, adjusting the parameters and the order of the filter according to the tracking parameters, and recording the filtered error as Codeerr.
S6: the tracking control module adjusts the tracking parameters including, but not limited to, spreading factor SF, data buffer start address SAddr and length SLen, noise bandwidth of the loop filter, and integration period.
Wherein, step S6 is detailed as follows:
s61: firstly, initializing a spreading factor SF according to a coding structure of an initial frame given by a burst signal, and initializing a cache initial address SAddr; the buffer initial address SAddr can be configured to capture an address corresponding to the initial phase of the spread spectrum sequence at the tracking time;
s62: configuring an integration period, a noise bandwidth of a filter, and a data length SLen in step S2 based on the spreading factor SF; the integration period T is generally configured to be 1, i.e., 1 spreading sequence period. The noise bandwidth of the filter is dynamically adjusted according to the magnitude of the spreading factor SF. The selected buffer data length SLen is configured as: SLen = SFLen × UpSample, where SFLen is a sequence length corresponding to a spreading factor SF; upSample is the oversampling multiple of the system. The integration period T being 1 corresponds to a time of
Wherein F code Is the frequency of the spreading sequence.
S63: tracking a spread Spectrum Factor (SF) modulation signal, calculating the number BitCnt of data bit analyzed by tracking the spread Spectrum Factor (SF) according to the currently configured integration period after each tracking is finished, and updating a cache initial address SAddr; the number of the data bits which can be analyzed in an integration period T is T, the number of the analyzed data bits is accumulated during the tracking period of the spreading factor SF, and the accumulation result is recorded as BitCnt.
After the integration period T is completed, the start address SAddr of the next read cache data needs to be updated, and the formula is:
SAddr = mod (SAddr + SFLen + CodeErr, fifo len), where,
the fifo Len is the length of the data cache module, and the fifo Len is more than or equal to 2 SFLen generally; codeErr is the filtered error.
S64: comparing the number of data bits modulated by the spreading factor SF, which is informed by the burst signal, or the number of data bits analyzed from the collected data bit sequence by the spreading factor SF, with the number of data bits BitCnt analyzed by tracking in the step S63, judging whether tracking of the spreading factor SF modulation signal is finished, and if not, returning to the step S63; if yes, the step S62 is returned to after the next frame of spreading factor is configured; the spreading factor SF of the next frame can be obtained from the spreading factor sequence signalled by the burst or parsed from the sequence of data bits that have been collected.
Fig. 2 shows an instantaneous branch I/Q amplitude diagram for variable spreading factor signal tracking according to an embodiment of the present invention. In the tracking counting interval 35-214, the length of the spread spectrum sequence is reduced to one half of the initial tracking configuration value, and the amplitude of the instant I branch obtained by tracking is reduced by one half compared with the amplitude of the I branch obtained by tracking for the 34 th time; from the beginning of tracking count 215 until the end of the signal, the spreading sequence length is reduced to one of four times the starting tracking configuration value, and the amplitude of the instantaneous I branch obtained by tracking is reduced by one of four times compared with the I branch obtained by 34 th tracking. Therefore, the method of the present invention can still track stably and continuously after the spreading factor is changed.
As shown in fig. 3, a block diagram of a tracking system for a variable spreading factor modulated burst signal in micro-power wireless communication according to another preferred embodiment of the present invention includes a coherent demodulation module 10, a data buffering module 20, a despreading module 30, an integral calculation module 40, a tracking processing module 50, and a tracking control module 60, wherein:
the coherent demodulation module 10 receives the down-converted burst signal, and performs carrier stripping on the received down-converted burst signal to obtain a quasi-baseband signal, and sends the quasi-baseband signal to the data caching module 20;
the data buffer module 20 performs buffer storage on the baseband signal to obtain buffer data, and selects the buffer data with the corresponding length according to the spreading factor to send to the de-spreading module 30;
the despreading module 30 despreads the selected cache data, and transmits the despread data to the integral calculation module 40;
the integral calculation module 40 performs segment correlation on the despread data, calculates an integral result, and sends the integral result to the tracking processing module 50;
the tracking processing module 50 estimates the errors of the carrier frequency and the code phase according to the integration result, and performs filtering processing on the errors;
the trace control module 60 adjusts the trace parameters and uses the adjusted trace parameters at least to update the trace parameters employed in the data caching module 20 and the despreading module 30.
Further, the tracking system further includes a local pseudo code generating module 70, where the local pseudo code generating module 70 is configured to receive the spreading factor adjusted by the tracking control module 60, generate a pseudo code sequence according to the spreading factor, and send the pseudo code sequence to the despreading module 30, where the pseudo code sequence includes pseudo code sequences of an immediate branch, a leading branch, and a delay branch, which are generated according to the current spreading factor. The despreading module 30 correlates the selected buffered data with the pseudo code sequence to complete despreading of the selected buffered data.
Further, the tracking system further includes a local carrier generation module 80, and the local carrier generation module 80 is configured to receive the frequency error filtered by the tracking processing module 50, update the frequency of the local carrier according to the frequency error filtered by the local carrier, and send the updated frequency of the local carrier to the coherent demodulation module 10.
The method can adapt to continuous tracking of modulation signals with different spreading factors, automatically adjust tracking parameters, simplify the pseudo code sequence generated by a local pseudo code generation module by adjusting and selecting the initial address of the cache data, has high tracking sensitivity and low power consumption, meets the time precision requirement and has certain universality.
The foregoing is a further detailed description of the invention in connection with specific preferred embodiments and it is not intended to limit the invention to the specific embodiments described. For those skilled in the art to which the invention pertains, several equivalent substitutions or obvious modifications can be made without departing from the spirit of the invention, and all the properties or uses are considered to be within the scope of the invention.
Claims (10)
1. A tracking method for a variable spreading factor modulated burst signal suitable for micro-power wireless communication is characterized by comprising the following steps:
s1: carrying out carrier stripping on the received burst signal after the down conversion to obtain a quasi baseband signal;
s2: caching the quasi baseband signal to obtain cache data, and selecting the cache data with corresponding length according to the spread spectrum factor;
s3: performing despreading processing on the selected cache data;
s4: carrying out sectional correlation on the despread data and calculating an integral result;
s5: estimating errors of the carrier frequency and the code phase according to the integration result, and filtering the errors;
s6: adjusting tracking parameters, and using the adjusted tracking parameters at least for updating the tracking parameters adopted when executing the steps S2 and S3, wherein the tracking parameters comprise a spread spectrum factor, an initial address of cache data, a length of the cache data, a period of calculating an integration result and a noise bandwidth of filtering processing;
wherein, step S4 specifically includes:
dividing each path of correlation result into 8 sections, and recording the length of each section as L, wherein the section correlation result is as follows:
and selecting to calculate an integration result in a time domain or a frequency domain according to the tracking parameters, wherein the time domain calculation integration result is obtained by performing time domain accumulation on the segment correlation result.
2. The tracking method according to claim 1, wherein step S3 specifically comprises: performing correlation processing on the selected cache data and a locally generated pseudo code sequence to complete de-spreading processing on the selected cache data; the pseudo code sequences generated locally comprise pseudo code sequences of an immediate branch, a leading branch and a delay branch generated according to the current spreading factor.
3. The tracking method according to claim 1 or 2, characterized in that step S6 specifically comprises:
s61: initializing a spreading factor according to a coding structure of an initial frame given by a burst signal, and initializing a cache initial address;
s62: configuring an integration period, a noise bandwidth of a filter, and a data length in step S2 based on the spreading factor;
s63: tracking the spread spectrum factor modulation signal, and calculating the number of data bits analyzed by tracking the spread spectrum factor according to the currently configured integration period after each tracking is finished, and updating a cache initial address;
s64: and comparing the number of the data bits modulated by the spreading factor, which is informed by the burst signal, or the number of the data bits analyzed from the collected data bit sequence to the number of the data bits tracked and analyzed in the step S63, judging whether the tracking of the spreading factor modulation signal is finished, if not, repeating the steps S63-S64, and if so, repeating the steps S62-S64 after configuring the spreading factor of the next frame.
4. The tracking method according to claim 3, wherein the updating the cache start address in step S63 specifically includes: and configuring the cache start address of the next acquired data as the sum of the current cache start address, the data length configured in the step S62 and the code phase error filtered in the step S5.
5. The tracking method as claimed in claim 3, wherein in the step of configuring the spreading factor of the next frame in step S64, the spreading factor of the next frame is obtained from the spreading factor sequence notified by the burst signal or parsed from the sequence of the collected data bits.
6. The tracking method according to claim 3, wherein step S3 specifically comprises: performing correlation processing on the selected cache data and a locally generated pseudo code sequence to complete despreading processing on the selected cache data; the step of locally generating the pseudo code sequence is to generate a local pseudo code sequence according to the spreading factor in step S62, and if it is determined in step S64 that tracking of the current spreading factor modulation signal is not completed, the generated local pseudo code sequence remains unchanged.
7. A tracking system suitable for a burst signal modulated by a variable spreading factor of micropower wireless communication is characterized by comprising a coherent demodulation module, a data buffer module, a de-spreading module, an integral calculation module, a tracking processing module and a tracking control module, wherein:
the coherent demodulation module receives the burst signal after the down-conversion, and carries out carrier stripping on the received burst signal after the down-conversion to obtain a quasi-baseband signal which is sent to the data cache module;
the data caching module caches the quasi-baseband signal to obtain cached data, and selects the cached data with corresponding length according to the spread spectrum factor to send to the despreading module;
the de-spreading module is used for de-spreading the selected cache data and sending the de-spread data to the integral calculation module;
the integral calculation module carries out sectional correlation on the despread data, calculates an integral result and sends the integral result to the tracking processing module;
the tracking processing module estimates errors of carrier frequency and code phase according to the integral result and carries out filtering processing on the errors;
the tracking control module adjusts tracking parameters, and the adjusted tracking parameters are at least used for updating the tracking parameters adopted in the data caching module and the despreading module, wherein the tracking parameters comprise a spread spectrum factor, an initial address of cached data, the length of the cached data, the period of a calculation integral result and the noise bandwidth of filtering processing;
the step of performing segment correlation on the despread data and calculating an integration result by the integration calculating module specifically includes:
dividing each path of correlation result into 8 sections, and recording the length of each section as L, wherein the section correlation result is as follows:
and selecting to calculate an integration result in a time domain or a frequency domain according to the tracking parameters, wherein the time domain calculation integration result is to perform time domain accumulation on the segment correlation result.
8. The tracking system according to claim 7, further comprising a local pseudo code generating module, wherein the local pseudo code generating module is configured to receive the spreading factor adjusted by the tracking control module, generate a pseudo code sequence according to the spreading factor, and send the pseudo code sequence to the despreading module, wherein the pseudo code sequence includes pseudo code sequences of an immediate branch, a leading branch and a delay branch generated according to a current spreading factor.
9. The tracking system of claim 8, wherein the despreading module correlates selected ones of the buffered data with the pseudo-code sequence to complete despreading of the selected ones of the buffered data.
10. The tracking system according to claim 7, further comprising a local carrier generation module, wherein the local carrier generation module is configured to receive the frequency error filtered by the tracking processing module, update the frequency of the local carrier according to the frequency error filtered by the tracking processing module, and send the updated frequency of the local carrier to the coherent demodulation module.
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