CN116506272A - Signal processing method and device for GFSK demodulation, receiver and electronic equipment - Google Patents

Signal processing method and device for GFSK demodulation, receiver and electronic equipment Download PDF

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Publication number
CN116506272A
CN116506272A CN202310425451.9A CN202310425451A CN116506272A CN 116506272 A CN116506272 A CN 116506272A CN 202310425451 A CN202310425451 A CN 202310425451A CN 116506272 A CN116506272 A CN 116506272A
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sequence
angle
window
signal
gfsk
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黄海力
金海鹏
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TAILING MICROELECTRONICS (SHANGHAI) CO Ltd
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TAILING MICROELECTRONICS (SHANGHAI) CO Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/14—Demodulator circuits; Receiver circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0054—Detection of the synchronisation error by features other than the received signal transition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0079—Receiver details
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)

Abstract

The invention discloses a signal processing method and device for GFSK demodulation, a receiver and electronic equipment, wherein the method comprises the following steps: obtaining a local angle sequence of a theoretical GFSK modulation signal based on a preset synchronous word; obtaining a reference angle differential sequence based on the local angle sequence; obtaining a sequence of signal angles based on the received baseband signal; obtaining a window angle differential sequence corresponding to each window state from the signal angle sequence based on the sliding window, wherein the size of the sliding window is determined by the length of the local angle sequence; determining a synchronous position for GFSK demodulation in a received baseband signal based on a window state with maximum similarity between the window angle differential sequence and the reference angle differential sequence; or comprises: determining interference brought by a previous symbol sequence and a next symbol sequence according to a preset synchronous word; and making a syncword decision by canceling the interference based on the synchronization position. Therefore, the invention can reduce the operation complexity, thereby reducing the operation cost of the system and improving the demodulation performance of the system.

Description

Signal processing method and device for GFSK demodulation, receiver and electronic equipment
Technical Field
The present disclosure relates to digital signal processing technology, and more particularly, to a signal processing method and apparatus for Gaussian Frequency Shift Keying (GFSK) demodulation, a receiver, and an electronic device.
Background
Frequency Shift Keying (FSK) is a frequency modulation scheme in which transmission occurs by discrete frequency variations of a carrier signalDigital information. Gaussian FSK (GFSK) is an improvement based on FSK in that the frequency of the carrier signal is not directly modulated with data symbols and changes instantaneously at the beginning of each symbol, but rather the data pulses are filtered using a pulse shaping gaussian filter before modulating the carrier signal. The gaussian filter smoothes the transitions between symbols. GFSK is widely used in low data rate personal communication standards such as, but not limited to, classical bluetoothBluetooth low energy (+)>Low Energy (LE)), 802.11 protocol.
At the GFSK modulation end (e.g., transmitter side), a gaussian filter first filters a rectangular pulse sequence representing a sequence of data symbols to be transmitted to produce a shaped pulse signal; the FSK modulator modulates the frequency of the carrier signal by using the shaping pulse signal to generate a GFSK modulation signal; the GFSK modulated signal is then transmitted as an RF signal through the transmitter back end and antenna. At the GFSK demodulation end (e.g., receiver side), the RF front end generates complex (IQ) sampled signals from the RF GFSK modulated signals captured by the antenna, and the baseband circuit performs GFSK demodulation by processing the IQ sampled signals to obtain the original data symbol sequence.
At the GFSK demodulation end, synchronization of the received signal is required to ensure GFSK demodulation accuracy. For example, one of the known GFSK demodulation synchronization methods for bluetooth low energy is to correlate the received signal with a locally generated standard sequence in the time domain to peak the correlation, but the method is complex and susceptible to AGC adjustments, resulting in a decision to access the address code called a bottleneck.
Disclosure of Invention
Embodiments of the present invention aim to provide a signal processing method and apparatus, a receiver and an electronic device for GFSK demodulation to address at least the problems of the prior art described above.
An embodiment of the present invention provides a signal processing method for GFSK demodulation, including: s110, obtaining a local angle sequence of a theoretical GFSK modulation signal based on a preset synchronous word; s120, obtaining a reference angle differential sequence based on the local angle sequence; s130, obtaining a signal angle sequence based on a received baseband signal; s140, based on a sliding window, a window angle differential sequence corresponding to each window state is obtained from the signal angle sequence, wherein the size of the sliding window is determined by the length of the local angle sequence; and S150, determining a synchronization position for GFSK demodulation in the received baseband signal based on a window state with the maximum similarity between the window angle differential sequence and the reference angle differential sequence.
The embodiment of the invention also provides a signal processing method for GFSK demodulation, which comprises the following steps: determining interference brought by a previous symbol sequence and a next symbol sequence according to a preset synchronous word; and making a syncword decision by cancelling the interference based on a predetermined synchronization position.
The embodiment of the invention also provides a signal processing device for GFSK demodulation, which comprises: the local angle sequence acquisition module is configured to acquire a local angle sequence of the theoretical GFSK modulation signal based on a preset synchronous word; a reference angle differential sequence acquisition module configured to obtain a reference angle differential sequence based on the local angle sequence; a signal angle sequence acquisition module configured to obtain a signal angle sequence based on the received baseband signal; a window angle differential sequence acquisition module configured to obtain a window angle differential sequence corresponding to each window state from the signal angle sequence based on a sliding window, wherein a size of the sliding window is determined by a length of the local angle sequence; and a synchronization position determining module configured to determine a synchronization position for GFSK demodulation in the baseband signal based on a window state in which a similarity of the window angle differential sequence and the reference angle differential sequence is maximum.
The embodiment of the invention also provides a signal processing device for GFSK demodulation, which comprises: the interference determination module is configured to determine interference brought by a previous symbol sequence and a next symbol sequence according to a preset synchronous word; and a sync word decision module that makes a sync word decision by canceling the interference based on a predetermined synchronization position.
The embodiment of the invention also provides a receiver which comprises the signal processing device for GFSK demodulation.
An embodiment of the present invention also provides an electronic device, including a processor and a storage device, where the storage device stores program instructions that, when executed by the processor, cause the electronic device to implement the aforementioned signal processing method for GFSK demodulation.
Drawings
Fig. 1 is a schematic flow chart of a signal processing method for GFSK demodulation according to an embodiment of the invention;
fig. 2 is a schematic diagram of a data frame structure of BLE;
fig. 3 is a schematic structural view of a signal processing apparatus for GFSK demodulation according to an embodiment of the invention; and
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Fig. 1 is a flowchart of a signal processing method for GFSK demodulation according to an embodiment of the invention, which is applicable to wireless communication standards including, but not limited to, bluetooth Low Energy (BLE). The signal processing method for GFSK demodulation provided in the present embodiment may be performed by the signal processing apparatus for GFSK demodulation provided in the embodiment of the present invention, which may be implemented in software and/or hardware and integrated in a receiver or an electronic device.
As shown in fig. 1, the signal processing method for GFSK demodulation includes the following steps.
S110: and obtaining a local angle sequence of the theoretical GFSK modulation signal based on a preset synchronous word.
It will be appreciated that the preset sync word is a sync code sequence in the signal frame structure to be demodulated and is thus preset in the signal processing device (i.e., demodulation end) for GFSK demodulation. In some embodiments, the sync word may be an access address when the above method is specifically used for BLE. As shown in fig. 2, the access address length is 4 bytes, i.e. 32 bits total.
In some embodiments, S110 may include: generating the theoretical GFSK modulated signal by upsampling the sync word and GFSK modulating; and obtaining a local angle sequence through angle calculation of the theoretical GFSK modulation signal. For example, the sync word is up-sampled by a preset multiple. Illustratively, the length of the theoretical GFSK modulated signal (and the local angle sequence) may be L SW * OSR+1, wherein L SW For the bit length of the sync word, the OSR is an upsampling multiple.
Taking BLE application scenario as an example, the local ANGLE sequence pgfsk may be defined as pgfsk=angle (GFSK (upslope (AA))), where upslope represents upsampling, GFSK represents GFSK modulation, ANGLE represents ANGLE finding, and AA refers to the access address for BLE.
S120: and obtaining a reference angle differential sequence based on the local angle sequence.
In some embodiments, S120 may include: generating a first sequence of sampled angles by a first downsampling of the local sequence of angles, wherein the first downsampling is the same as a multiple of the upsampling; and obtaining an angle differential sequence of the first sampling angle sequence as the reference angle differential sequence. Illustratively, the downsampling of the local angle sequence is performed at a preset multiple (e.g., OSR) as previously described for upsampling the syncword. For example, the ith term of the first sampled angle sequence is the (1+ (i-1): OSR) term angle value in the local angle sequence, where i is 1 to L SW +1, and the j-th term of the reference angle differential sequence is the angle difference of the j+1th term minus the j-th term in the first sampling angle sequence, wherein j is 1 to L SW Is a positive integer of (a).
For example, the reference angle differential sequence may be defined as pgfsk_diff=pgfsk (1+osr: OSR: end) -pgfsk (1: OSR: end-OSR), where end refers to L SW *OSR+1。
S130: a sequence of signal angles is obtained based on the received baseband signal.
In some embodiments, S130 may include: generating the received baseband signal by processing the received signal, wherein the processing includes sampling at a sampling rate that is the same as a multiple of the upsampling; and obtaining the signal angle sequence through angle calculation of the received baseband signal. Illustratively, the sampling is performed at a predetermined multiple (e.g., OSR) as described above for upsampling the syncword as the sampling rate.
For example, the signal ANGLE sequence may be defined as rx_phase=angle (rx_sig), where rx_sig represents the received baseband signal.
S140: a window angle differential sequence corresponding to each window state is obtained from the signal angle sequence based on a sliding window, wherein the size of the sliding window is determined by the length of the local angle sequence.
In some embodiments, S140 may include: generating, for each window state, a second sequence of sampling angles by second downsampling extracted from a sub-sequence within a respective window in the sequence of signal angles, wherein the second downsampling is the same as a multiple of the upsampling; and obtaining an angle differential sequence of the second sampling angle sequence as the window angle differential sequence. For example, the size of the sliding window may be L SW * Osr+1, the sliding window may have a step size of 1 signal angle (i.e., corresponding to 1 received baseband signal sample point). Illustratively, downsampling of the sub-sequences within the respective windows is performed at a preset multiple (e.g., OSR) as previously described for upsampling the syncword. For example, the ith term of each second sampling angle sequence is the (1+ (i-1): OSR) term angle value in the corresponding window subsequence, where i is 1 to L SW Positive integer of +1, and the j-th term of each window angle difference sequence is the angle difference of the j+1th term minus the j-th term in the corresponding second sampling angle sequence, wherein j is 1 to L SW Is a positive integer of (a).
For example, the window angle differential sequence may be defined as phase_diff_win (idx) =phase_diff (idx: idx+win-1), where phase_diff=rx_phase (1+osr: end) -rx_phase (1: OSR: end-OSR), idx represents the position (e.g., index or number) of the signal angle element (in the signal angle sequence) at the window start of the corresponding window state (or the corresponding received baseband signal sampling point position).
S150: and determining a synchronization position for GFSK demodulation in the received baseband signal based on a window state in which the similarity between the window angle differential sequence and the reference angle differential sequence is maximum.
In some embodiments, prior to S150 (e.g., after S140), the above method may further include: for each window state, an average deviation is obtained based on a difference between the window angle differential sequence and the reference angle differential sequence. It will be appreciated that the smaller the average deviation, the greater the similarity of the window angle differential sequence of the corresponding window states to the reference angle differential sequence. For example, the average deviation may be obtained by sequentially performing an angle principal value calculation and a unwrapping calculation on a difference sequence between the window angle differential sequence and the reference angle differential sequence to obtain an angle differential difference sequence, and then sequentially performing an angle principal value calculation, an absolute value calculation and an averaging calculation on differences between each element of the angle differential difference sequence and an average value thereof. It will be appreciated that the principal value of angle calculation ensures that the angle of the output is within the range of [ -pi: pi ], and the unwrapping calculation ensures that the difference between two adjacent angles in the sequence is within the range of [ -pi: pi ].
For example, the average deviation may be defined as diff_std (idx) =mean (ABS (ANGLETRANS (diff_out (idx) -diff_mean (idx))), wherein diff_out (idx) =unwrap (ANGLETRANS (phase_diff_win (idx) -pgfsk_diff)), and diff_mean (idx) =mean (diff_out (idx)), wherein MEAN represents the MEAN, ABS represents the absolute value, ANGLETRANS represents the angular principal value, and UNWRAP represents the UNWRAP.
Based on the above embodiment, S150 may include: and determining a local minimum value smaller than a preset threshold value in the average deviation, and determining the synchronous position based on a window state corresponding to the local minimum value. The preset threshold value may be, for example, 0.4 to 0.7, preferably 0.6. As a specific embodiment, a sliding range of the sliding window (i.e. a period for determining a local minimum value of the average deviation) may be preset, and an average deviation smaller than a preset threshold value is determined within the sliding range, and if there are a plurality of average deviations smaller than the preset threshold value, the minimum value is selected among them for determining the synchronization position. For example, a received baseband signal sampling point corresponding to a signal angle (in a signal angle sequence) at a window start of a window state corresponding to the local minimum is taken as the synchronization position.
Therefore, the signal processing method for GFSK demodulation according to the embodiment of the present invention determines the synchronization position for demodulating the received signal by comparing the correlation between the received signal and the local sequence in the frequency domain operation, at least can reduce the operation complexity compared with the prior art in which the correlation peak operation is performed in the time domain, thereby reducing the operation cost of the system and improving the demodulation performance of the system.
In some embodiments, the above method may further comprise: and obtaining frequency offset according to the synchronous position, so as to carry out frequency offset compensation. As a specific embodiment, the frequency offset to be compensated may be calculated by using the mean value of the angle difference value sequence as described above, which corresponds to the window state corresponding to the synchronization position. For example, the frequency offset may be defined as freq_offset=mean_diff (peak_idx)/2/pi fsamples, where peak_idx represents the synchronization position (e.g., the start signal angle or the position of the received baseband signal sampling point corresponding to its corresponding window state), and fsamples represent the rate of chips.
In some embodiments, the above method may further comprise: determining interference brought by a previous symbol sequence and a next symbol sequence according to the preset synchronous word; and making a syncword decision by cancelling the interference based on the synchronization position. For example, the interference is caused by inter-symbol interference (ISI). This sync word decision scheme may be referred to as pesudo-DFD (pseudo-decision feedback demodulation). Illustratively, the former symbol sequence refers to a symbol sequence (same length) one bit behind the preset sync word, and the latter symbol sequence refers to a symbol sequence (same length) one bit ahead of the preset sync word. As a specific embodiment, the reference phase interference value provided by a Decision Feedback Equalizer (DFE) is used to determine the interference introduced by the previous symbol sequence and the subsequent symbol sequence. As a specific embodiment, the synchronization word decision is made using the window angle differential sequence and the mean of the angle differential difference sequence as described above based on the synchronization position. Taking the BLE application scenario as an example, the interference caused by the previous symbol sequence and the next symbol sequence may be defined as aa_pre= [0 (AA (1: end-1) ×2-1) ], dfe_phase and aa_post= [ (AA (2: end) ×2-1) 0 ]. Times.dfe_phase, where [0 (AA (1: end-1) ×2-1) ] represents a corresponding co-length NZR code of one bit behind the AA code, [ (AA (2: end) ×2-1) 0] represents a corresponding co-length NZR code of one bit ahead of the AA code, and dfe_phase represents a reference PHASE interference value (a reference interference value generated in PHASE by an adjacent (front/rear) symbol to the current symbol) provided by DFE; the decision to determine whether the received AA code is correct may be defined as aacode_rx=sign (ANGLETRANS (phase_diff_win (pk_idx) -diff_mean (pk_idx) -aa_pre-aa_post)), where SIGN is a SIGN function. Thus, excellent decision performance can be further achieved with lower complexity.
Although the implementation of the pesudo-DFD scheme in the above description is based on the synchronization method according to the previous embodiment (i.e. the synchronization position determined thereby), the pesudo-DFD scheme may also be independent of the above synchronization method, e.g. based on other synchronization schemes known in the prior art, such as time domain based synchronization schemes.
Accordingly, there is also provided, according to an embodiment of the present invention, another signal processing method for GFSK demodulation, including: determining interference brought by a previous symbol sequence and a next symbol sequence according to a preset synchronous word; and making a syncword decision by cancelling the interference based on the synchronization position. Specific implementation details are described with reference to the pesudo-DFD scheme described above.
Fig. 3 is a schematic structural diagram of a signal processing apparatus for GFSK demodulation according to an embodiment of the present invention configured to perform the signal processing method for GFSK demodulation provided by the foregoing embodiment.
As shown in fig. 3, the signal processing apparatus for GFSK demodulation includes a local angle sequence acquisition module 310, a reference angle differential sequence acquisition module 320, a signal angle sequence acquisition module 330, a window angle differential sequence acquisition module 340, and a synchronization position determination module 350.
The local angle sequence acquisition module 310 is configured to obtain a local angle sequence of the theoretical GFSK modulated signal based on a preset syncword.
In some embodiments, the sync word may be an access address when the above method is specifically used for BLE.
In some embodiments, the local angle sequence acquisition module 310 may be specifically configured to: generating the theoretical GFSK modulated signal by upsampling the sync word and GFSK modulating; and obtaining a local angle sequence through angle calculation of the theoretical GFSK modulation signal.
The reference angle differential sequence acquisition module 320 is configured to obtain a reference angle differential sequence based on the local angle sequence.
In some embodiments, the reference angle differential sequence acquisition module 320 may be specifically configured to: generating a first sequence of sampled angles by a first downsampling of the local sequence of angles, wherein the first downsampling is the same as a multiple of the upsampling; and obtaining an angle differential sequence of the first sampling angle sequence as the reference angle differential sequence.
The signal angle sequence acquisition module 330 is configured to obtain a signal angle sequence based on the received baseband signal.
In some embodiments, the signal angle sequence acquisition module 330 may be specifically configured to: generating the received baseband signal by processing the received signal, wherein the processing includes sampling at a sampling rate that is the same as a multiple of the upsampling; and obtaining the signal angle sequence through angle calculation of the received baseband signal.
The window angle differential sequence acquisition module 340 is configured to obtain a window angle differential sequence corresponding to each window state from the signal angle sequence based on a sliding window, wherein the size of the sliding window is determined by the length of the local angle sequence.
In some embodiments, the window angle differential sequence acquisition module 340 may be specifically configured to: generating, for each window state, a second sequence of sampling angles by second downsampling extracted from a sub-sequence within a respective window in the sequence of signal angles, wherein the second downsampling is the same as a multiple of the upsampling; and obtaining an angle differential sequence of the second sampling angle sequence as the window angle differential sequence.
The synchronization position determining module 350 is configured to determine a synchronization position for GFSK demodulation in the received baseband signal based on a window state in which a similarity of the window angle differential sequence to the reference angle differential sequence is greatest.
In some embodiments, the above apparatus may further include an average deviation acquisition module configured to obtain, for each window state, an average deviation based on a difference between the window angle differential sequence and the reference angle differential sequence. The average deviation obtaining module may obtain the angle difference sequence by sequentially performing angle principal value calculation and unwrapping calculation on the difference sequence between the window angle difference sequence and the reference angle difference sequence, and then sequentially performing angle principal value calculation, absolute value calculation and average calculation on the differences between each element of the angle difference sequence and the average value thereof, thereby obtaining the average deviation.
In some embodiments, the synchronization position determination module 350 may be specifically configured to: and determining a local minimum value smaller than a preset threshold value in the average deviation, and determining the synchronous position based on a window state corresponding to the local minimum value. The preset threshold value may be, for example, 0.4 to 0.7, preferably 0.6. As a specific embodiment, the synchronization position determining module 350 may preset a sliding range of the sliding window (i.e. a period for determining a local minimum of the average deviation), determine an average deviation smaller than a preset threshold value within the sliding range, and if there are multiple average deviations smaller than the preset threshold value, select a minimum value among the average deviations for determining the synchronization position.
Therefore, the signal processing device for GFSK demodulation according to the embodiment of the present invention determines the synchronization position for demodulating the received signal by comparing the correlation between the received signal and the local sequence in the frequency domain operation, at least the operation complexity can be reduced compared with the prior art in which the correlation peak operation is performed in the time domain, thereby reducing the operation cost of the system and improving the demodulation performance of the system.
In some embodiments, the apparatus may further include a frequency offset acquisition module configured to obtain a frequency offset from the synchronization position for frequency offset compensation. As a specific embodiment, the frequency offset to be compensated may be calculated by using the mean value of the angle difference value sequence as described above, which corresponds to the window state corresponding to the synchronization position.
In some embodiments, the apparatus may further comprise a decision module configured to: determining interference brought by a previous symbol sequence and a next symbol sequence according to the preset synchronous word; and making a syncword decision by cancelling the interference based on the synchronization position. In other words, the method of pesudo-DFD (pseudo-decision feedback demodulation) may be employed to decide on the reception of the sync word. Illustratively, the former symbol sequence refers to a symbol sequence (same length) one bit behind the preset sync word, and the latter symbol sequence refers to a symbol sequence (same length) one bit ahead of the preset sync word. As a specific embodiment, the reference phase interference value provided by a Decision Feedback Equalizer (DFE) is used to determine the interference introduced by the previous symbol sequence and the subsequent symbol sequence. As a specific embodiment, the synchronization word decision is made using the window angle differential sequence and the mean of the angle differential difference sequence as described above based on the synchronization position. Thus, excellent decision performance can be further achieved with lower complexity.
An embodiment of the present invention also provides another signal processing apparatus for GFSK demodulation, including: an interference determination module configured to determine interference caused by a previous symbol sequence and a subsequent symbol sequence according to a preset synchronization word; and a syncword decision module configured to make a syncword decision by canceling the interference based on the synchronization position. Specific implementation details are described with reference to the pesudo-DFD scheme described above.
An embodiment of the present invention also provides a receiver comprising the signal processing apparatus for GFSK demodulation according to the foregoing embodiment. The signal processing means for GFSK demodulation may be, for example, baseband circuitry in the receiver.
Fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 4, the electronic device includes a processor 410, a storage device 420, and a communication device 430; the number of processors 410 in the electronic device may be one or more, one processor 410 being taken as an example in fig. 4; the processor 410, the storage 420, and the communication means 430 in the electronic device may be connected by a bus or other means, for example by a bus connection in fig. 4.
The storage device 420 is used as a computer readable storage medium, and may be used to store a software program, a computer executable program, and a module, such as a module corresponding to a signal processing method for GFSK demodulation in an embodiment of the present invention (for example, the local angle sequence obtaining module 310, the reference angle differential sequence obtaining module 320, the signal angle sequence obtaining module 330, the window angle differential sequence obtaining module 340, and the synchronization position determining module 350 in the signal processing device for GFSK demodulation). The processor 410 executes various functional applications of the electronic device and data processing, i.e., implements the signal processing method for GFSK demodulation described above, by running software programs, instructions, and modules stored in the storage 420.
The storage device 420 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for functions; the storage data area may store data created according to the use of the terminal, etc. In addition, the storage 420 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some examples, the storage 420 may further include memory remotely located with respect to the processor 410, which may be connected to the electronic device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Communication means 430 for implementing a network connection or mobile data connection between the servers.
The electronic device provided by the embodiment can be used for executing the signal processing method for GFSK demodulation provided by the above embodiment, and has corresponding functions and beneficial effects.
The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, the program when executed by a processor implementing the signal processing method for GFSK demodulation in any embodiment of the invention, the method specifically comprising: obtaining a local angle sequence of a theoretical GFSK modulation signal based on a preset synchronous word; obtaining a reference angle differential sequence based on the local angle sequence; obtaining a sequence of signal angles based on the received baseband signal; obtaining a window angle differential sequence corresponding to each window state from the signal angle sequence based on a sliding window, wherein the size of the sliding window is determined by the length of the local angle sequence; determining a synchronization position for GFSK demodulation in the received baseband signal based on a window state in which the similarity between the window angle differential sequence and the reference angle differential sequence is the greatest; or the method specifically comprises the following steps: determining interference brought by a previous symbol sequence and a next symbol sequence according to a preset synchronous word; and making a syncword decision by cancelling the interference based on the synchronization position.
Of course, the storage medium containing the computer executable instructions provided in the embodiments of the present invention is not limited to the method operations described above, and may also perform the related operations in the signal processing method for GFSK demodulation provided in any embodiment of the present invention.
From the above description of embodiments, it will be clear to a person skilled in the art that the present invention may be implemented by means of software and necessary general purpose hardware, but of course also by means of hardware, although in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, etc., including several instructions for causing an electronic device (which may be a personal computer, a server or a network device, etc.) to execute the method according to the embodiments of the present invention.
It should be noted that, in the above-described embodiment of the signal processing apparatus for GFSK demodulation, each unit and module included is divided according to the functional logic only, but is not limited to the above-described division, as long as the corresponding function can be realized; in addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present invention.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (20)

1. A signal processing method for GFSK demodulation, comprising:
s110, obtaining a local angle sequence of a theoretical GFSK modulation signal based on a preset synchronous word;
s120, obtaining a reference angle differential sequence based on the local angle sequence;
s130, obtaining a signal angle sequence based on a received baseband signal;
s140, based on a sliding window, a window angle differential sequence corresponding to each window state is obtained from the signal angle sequence, wherein the size of the sliding window is determined by the length of the local angle sequence; and
and S150, determining a synchronization position for GFSK demodulation in the received baseband signal based on a window state with the maximum similarity between the window angle differential sequence and the reference angle differential sequence.
2. The signal processing method for GFSK demodulation of claim 1, wherein the S110 comprises:
generating the theoretical GFSK modulated signal by upsampling the sync word and GFSK modulating; and
and obtaining a local angle sequence through angle calculation of the theoretical GFSK modulation signal.
3. The signal processing method for GFSK demodulation according to claim 2, wherein the S120 comprises:
generating a first sequence of sampled angles by a first downsampling of the local sequence of angles, wherein the first downsampling is the same as a multiple of the upsampling; and
and obtaining an angle differential sequence of the first sampling angle sequence as the reference angle differential sequence.
4. The signal processing method for GFSK demodulation of claim 2, wherein the S130 comprises:
generating the received baseband signal by processing the received signal, wherein the processing includes a sampling operation at a sampling rate that is the same as a multiple of the upsampling; and
the signal angle sequence is obtained by performing angle calculation on the received baseband signal.
5. The signal processing method for GFSK demodulation of claim 2, wherein the S140 comprises:
generating, for each window state, a second sequence of sampling angles by second downsampling extracted from a sub-sequence within a respective window in the sequence of signal angles, wherein the second downsampling is the same as a multiple of the upsampling; and
and obtaining an angle differential sequence of the second sampling angle sequence as the window angle differential sequence.
6. The signal processing method for GFSK demodulation according to claim 1, wherein prior to said S150, said signal processing method for GFSK demodulation further comprises:
for each window state, an average deviation is obtained based on a difference between the window angle differential sequence and the reference angle differential sequence.
7. The signal processing method for GFSK demodulation according to claim 6, wherein the average deviation is obtained by sequentially performing an angle principal value calculation and a unwrapping calculation on a difference sequence between the window angle differential sequence and the reference angle differential sequence to obtain an angle differential difference sequence, and then sequentially performing an angle principal value calculation, an absolute value calculation, and an averaging calculation on a difference between each element of the angle differential difference sequence and its average value.
8. The signal processing method for GFSK demodulation of claim 6, wherein the S150 comprises: and determining a local minimum value smaller than a preset threshold value in the average deviation, and determining the synchronous position based on a window state corresponding to the local minimum value.
9. The signal processing method for GFSK demodulation of claim 8, wherein the preset threshold value is 0.4 to 0.7.
10. A signal processing method for GFSK demodulation, comprising:
determining interference brought by a previous symbol sequence and a next symbol sequence according to a preset synchronous word; and
a syncword decision is made by canceling the interference based on a predetermined synchronization position.
11. The signal processing method for GFSK demodulation of claim 10, wherein the interference from the previous symbol sequence and the subsequent symbol sequence is determined using a reference phase interference value provided by a Decision Feedback Equalizer (DFE).
12. The signal processing method for GFSK demodulation of claim 10, wherein a synchronization word decision is made using a window angle difference sequence obtained from a signal angle sequence of a received baseband signal based on the synchronization position, a window size of the window angle difference sequence being determined by a length of a local angle sequence based on the preset synchronization word, and an average of angle difference sequences obtained from a difference between the window angle difference sequence and a reference angle difference sequence based on the local angle sequence.
13. A signal processing apparatus for GFSK demodulation, comprising:
the local angle sequence acquisition module is configured to acquire a local angle sequence of the theoretical GFSK modulation signal based on a preset synchronous word;
a reference angle differential sequence acquisition module configured to obtain a reference angle differential sequence based on the local angle sequence;
a signal angle sequence acquisition module configured to obtain a signal angle sequence based on the received baseband signal;
a window angle differential sequence acquisition module configured to obtain a window angle differential sequence corresponding to each window state from the signal angle sequence based on a sliding window, wherein a size of the sliding window is determined by a length of the local angle sequence; and
and the synchronous position determining module is configured to determine a synchronous position used for GFSK demodulation in the baseband signal based on a window state with the maximum similarity between the window angle differential sequence and the reference angle differential sequence.
14. The signal processing device for GFSK demodulation of claim 13, further comprising an average deviation acquisition module configured to obtain an average deviation based on a difference between the sequence of window angle differences and the sequence of reference angle differences for each window state.
15. The signal processing device for GFSK demodulation of claim 14, wherein the synchronization position determination module is configured to: and determining a local minimum value smaller than a preset threshold value in the average deviation, and determining the synchronous position based on a window state corresponding to the local minimum value.
16. A signal processing apparatus for GFSK demodulation, comprising:
an interference determination module configured to determine interference caused by a previous symbol sequence and a subsequent symbol sequence according to a preset synchronization word; and
and a sync word decision module that makes a sync word decision by canceling the interference based on a predetermined sync position.
17. The signal processing apparatus for GFSK demodulation of claim 16, wherein the interference from the previous symbol sequence and the subsequent symbol sequence is determined using a reference phase interference value provided by a Decision Feedback Equalizer (DFE).
18. The signal processing method for GFSK demodulation of claim 16, wherein a syncword decision is made using a window angle differential sequence obtained from a signal angle sequence of a received baseband signal based on the sync position, a window size of the window angle differential sequence determined by a length of a local angle sequence based on the preset syncword, and a mean value of an angle differential difference sequence obtained from a difference between the window angle differential sequence and a reference angle differential sequence based on the local angle sequence.
19. A receiver comprising a signal processing apparatus for GFSK demodulation according to claim 13 or 16.
20. An electronic device comprising a processor and a storage device, wherein the storage device stores program instructions that, when executed by the processor, cause the electronic device to implement the signal processing method for GFSK demodulation of claim 1 or 10.
CN202310425451.9A 2023-04-20 2023-04-20 Signal processing method and device for GFSK demodulation, receiver and electronic equipment Pending CN116506272A (en)

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