CN115632919A - Signal processing method and system - Google Patents
Signal processing method and system Download PDFInfo
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- CN115632919A CN115632919A CN202211416423.2A CN202211416423A CN115632919A CN 115632919 A CN115632919 A CN 115632919A CN 202211416423 A CN202211416423 A CN 202211416423A CN 115632919 A CN115632919 A CN 115632919A
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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
- H04L27/106—M-ary FSK
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
- H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
- H04L27/2271—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals
- H04L27/2273—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals associated with quadrature demodulation, e.g. Costas loop
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B2001/6912—Spread spectrum techniques using chirp
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Abstract
The invention provides a signal processing method and a system, comprising the following steps: and despreading the PSDU part of the zigbee signals demodulated by the MSK, wherein each zigbee signal is despread independently, so that correlation errors of the two are prevented from being introduced when the MSK is converted into the O-QPSK, and ambiguity generated by threshold selection when sampling points are combined is avoided. The PSDU part of the zigbee baseband signal demodulated by the MSK is despread by storing the pre-transcoding and calculating the similarity soft decision, and the following two purposes can be achieved at the same time: 1) And errors introduced by the correlation of front and back chips in the conversion from MSK to O-QPSK are avoided. 2) Avoiding ambiguity generated by threshold selection when sampling points are combined; the invention achieves unexpected technical effects as two technical problems are solved simultaneously.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a signal processing method and system.
Background
The existing method for receiving zigbee signals in 2.4G frequency band after down-conversion comprises the following steps: directly demodulating O-QPSK signals, or carrying out MSK demodulation for being compatible with Bluetooth BLE, then merging sampling points, carrying out MSK-to-O-QPSK transcoding to obtain chip codes of zigbee, and then carrying out despreading.
However, since the chip before and after MSK to O-QPSK conversion has correlation, errors are introduced, and ambiguity occurs due to threshold selection when sampling points are combined.
Disclosure of Invention
The present invention provides a signal processing method and system to solve the problems of error introduced during the conventional MSK to O-QPSK conversion and ambiguity caused by threshold selection during the sample point combination.
In order to solve the above technical problem, the present invention provides a signal processing method, including:
and despreading the PSDU part of the zigbee signals demodulated by the MSK, wherein each zigbee signal is despread independently, so that correlation errors of the two are prevented from being introduced when the MSK is converted into the O-QPSK, and ambiguity generated by threshold selection when sampling points are combined is avoided.
Optionally, in the signal processing method, the method further includes:
the PSDU part of the zigbee baseband signal demodulated by the MSK is despread by storing pre-transcoding and similarity soft decision calculation, so that errors caused by correlation between front and rear chips when the MSK is converted into the O-QPSK are avoided, and ambiguity caused by threshold selection when sampling points are combined is avoided.
Optionally, in the signal processing method, the method further includes:
the processing of the zigbee baseband signal is performed based on the MSK demodulated receiver, and comprises the following steps:
the zero intermediate frequency zigbee baseband signal sequentially undergoes low-pass filtering, MSK demodulation, frame synchronization, frequency offset compensation, header information extraction, PSDU de-spreading and symbol-to-bit conversion.
Optionally, in the signal processing method, to improve the overall sensitivity of the MSK demodulation receiver, the PSDU despreading includes:
obtaining a coding table through O-QPSK and MSK mathematical derivation;
the receiver samples the zigbee chip bit signal with the rate of 2M/s by 16 times at the rate of 32M/s;
obtaining a first sampling point of the PSDU through a frame synchronization module;
sequentially calculating the number of sampling points with the signal amplitude larger than 0 in each 16 sampling points from the first sampling point to obtain a numerical value X;
and calculating 32 groups by analogy, wherein each group comprises 16 sampling points to obtain X1-X32, and the value range is [0,16].
Optionally, in the signal processing method, the method further includes:
calculating similarities S0 to S15 with sym0 to sym15, comparing S0 to S15, and taking sym corresponding to the minimum value of S0 to S15;
calculating the similarities S0 to S15 with sym0 to sym15 includes:
judging whether chip [ n ] is 1, if yes, calculating |16-Xn |, and if not, calculating | Xn-0|, and obtaining Yn;
the similarity S0 of sym0 is obtained by summing Y1 to Y31.
Optionally, in the signal processing method, the method further includes:
using X1-X32 to respectively calculate the following similarity of 0000-1111, and analogizing Sym 0-Sym 15 by using a signal Sym0 corresponding to 0000 as an example:
if chip [ n ] corresponding to Sym0 is 1, calculating |16-Xn | to obtain Yn;
if chip [ n ] corresponding to Sym0 is 0, calculating | Xn-0| to obtain Yn;
and so on to obtain Y1-Y31 corresponding to 31 bits in the chip corresponding to sym0, and then summing Y1-Y31 to obtain similarity S0 of sym 0;
respectively obtaining S0-S15 corresponding to sym 0-sym 15 by the method;
then comparing S0-S15 to obtain the minimum number, wherein the corresponding sym is a de-spread result;
if there are multiple minimum numbers, the sym with the minimum value is taken as the despreading result.
The present invention also provides a signal processing system comprising:
an MSK-demodulated receiver configured to demodulate the zigbee signal MSK; and
and the de-spreading module is configured to de-spread the PSDU part of the zigbee signals demodulated by the MSK, and each zigbee signal is de-spread independently so as to avoid introducing correlation errors of the two signals when the MSK is converted into the O-QPSK and avoid ambiguity generated by threshold selection when sampling points are combined.
Optionally, in the signal processing system, the despreading module includes:
the storage pre-transcoding module is configured to de-spread the PSDU part of the zigbee baseband signal demodulated by the MSK through storage pre-transcoding; and
and the similarity soft decision calculation module is configured to despread the PSDU part of the zigbee baseband signal demodulated by the MSK through similarity soft decision calculation.
Optionally, in the signal processing system, the MSK demodulation receiver includes:
the low-pass filtering module is configured to perform low-pass filtering processing on a zigbee baseband signal of zero intermediate frequency to be subjected to MSK demodulation; and
the MSK demodulation module is configured to carry out MSK demodulation on the zigbee baseband signal with zero intermediate frequency.
Optionally, in the signal processing system, the method further includes:
the frame synchronization module is configured to perform frame synchronization processing on the zero intermediate frequency zigbee baseband signal demodulated by the MSK;
the frequency offset compensation module is configured to perform frequency offset compensation processing on the zero intermediate frequency zigbee baseband signal after frame synchronization processing;
the head information extraction module is configured to extract head information from the zero intermediate frequency zigbee baseband signal after the frequency offset compensation processing and before the PSDU despreading processing; and
and the symbol-to-bit conversion module is configured to perform symbol-to-bit conversion processing on the zero intermediate frequency zigbee baseband signal after PSDU despreading processing.
In the signal processing method and system provided by the invention, the PSDU part of the zigbee baseband signal demodulated by the MSK is despread by storing the pre-transcoding and the similarity soft decision calculation, and the following two purposes can be simultaneously achieved: 1) And errors introduced by the correlation of front and back chips in the conversion from MSK to O-QPSK are avoided. 2) The ambiguity generated by threshold selection when the sampling points are combined is avoided; the invention achieves unexpected technical effects because of the simultaneous solution of two technical problems.
Drawings
Fig. 1 is a schematic overall flowchart of processing a zigbee baseband signal by a receiver based on MSK demodulation in a signal processing method according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating the similarity calculation performed on signals by X1 to X32 in the signal processing method according to an embodiment of the present invention.
Detailed Description
The invention is further elucidated with reference to the drawings in conjunction with the detailed description.
It should be noted that the components in the figures may be shown exaggerated for illustrative purposes and are not necessarily to scale. In the figures, identical or functionally identical components are provided with the same reference symbols.
In the present invention, "disposed on" \ 8230 "", "disposed over" \823030 "", and "disposed over" \8230 "", do not exclude the presence of an intermediate therebetween, unless otherwise specified. Furthermore, "arranged on or above" \\8230 ", merely indicates a relative positional relationship between two components, and in certain cases, such as after reversing the product direction, may also be converted to" arranged under or below \8230 ", and vice versa.
In the present invention, the embodiments are only intended to illustrate the aspects of the present invention, and should not be construed as limiting.
In the present invention, the terms "a" and "an" do not exclude the presence of a plurality of elements, unless otherwise specified.
It is further noted herein that in embodiments of the present invention, only a portion of the components or assemblies may be shown for clarity and simplicity, but those of ordinary skill in the art will appreciate that, given the teachings of the present invention, required components or assemblies may be added as needed in a particular scenario. Furthermore, features from different embodiments of the invention may be combined with each other, unless otherwise indicated. For example, a feature of the second embodiment may be substituted for a corresponding or functionally equivalent or similar feature of the first embodiment, and the resulting embodiments are likewise within the scope of the disclosure or recitation of the present application.
It is also to be noted here that, within the scope of the present invention, the expressions "identical", "equal" and the like do not mean that the two values are absolutely equal, but allow a certain reasonable error, that is, the expressions also cover "substantially identical", "substantially equal". By analogy, in the present invention, the terms "perpendicular", "parallel" and the like in the directions of the tables also cover the meanings of "substantially perpendicular", "substantially parallel".
The numbering of the steps of the methods of the present invention does not limit the order in which the method steps are performed. Unless specifically stated, the method steps may be performed in a different order.
The signal processing method and system provided by the present invention are further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
The present invention aims to provide a signal processing method and system to solve the problems of error introduced during the conventional MSK to O-QPSK conversion and ambiguity caused by threshold selection during sample point combination.
In order to achieve the above object, the present invention provides a signal processing method and system, including: and despreading the PSDU part of the zigbee signal demodulated by the MSK, wherein each zigbee signal is despread independently so as to avoid the introduction of correlation errors between the two when the MSK is converted into the O-QPSK and avoid the ambiguity generated by threshold selection when sampling points are combined.
FIGS. 1-2 provide a first embodiment of the invention, which shows a schematic flow diagram of a signal processing method; specifically, the schematic diagram of the overall framework (flow or module) of the signal processing method shown in fig. 1 includes: the zigbee baseband signal is processed by the MSK demodulation-based receiver, and a PSDU part despreading method is used to improve the sensitivity of the overall receiver, as shown in fig. 1, which specifically includes:
through O-QPSK and MSK mathematical derivation, a coding table is obtained, and the coding table is shown in the following table 1:
| Bin | Sym | Original zigbee chip | converted chip |
| 0000 | 0 | 11011001110000110101001000101110 | 1100000011101111010111001101100x |
| 0001 | 1 | 11101101100111000011010100100010 | 1001110000001110111101011100110x |
| 0010 | 2 | 00101110110110011100001101010010 | 1101100111000000111011110101110x |
| 0011 | 3 | 00100010111011011001110000110101 | 1100110110011100000011101111010x |
| 0100 | 4 | 01010010001011101101100111000011 | 0101110011011001110000001110111x |
| 0101 | 5 | 00110101001000101110110110011100 | 1111010111001101100111000000111x |
| 0110 | 6 | 11000011010100100010111011011001 | 1110111101011100110110011100000x |
| 0111 | 7 | 10011100001101010010001011101101 | 0000111011110101110011011001110x |
| 1000 | 8 | 10001100100101100000011101111011 | 0011111100010000101000110010011x |
| 1001 | 9 | 10111000110010010110000001110111 | 0110001111110001000010100011001x |
| 1010 | 10 | 01111011100011001001011000000111 | 0010011000111111000100001010001x |
| 1011 | 11 | 01110111101110001100100101100000 | 0010001001100011111100010000101x |
| 1100 | 12 | 00000111011110111000110010010110 | 1010001000100110001111110001000x |
| 1101 | 13 | 01100000011101111011100011001001 | 0000101000100010011000111111000x |
| 1110 | 14 | 10010110000001110111101110001100 | 0001000010100010001001100011111x |
| 1111 | 15 | 11001001011000000111011110111000 | 1111000100001010001100100110001x |
Table 1 (note: x in the table depends on the correlation of the previous and following data)
The MSK demodulated receiver samples the zigbee chip bit signal with the rate of 2M/s at 16 times at the rate of 32M/s, obtains the first sampling point of the PSDU through the frame synchronization module, and sequentially calculates the number of sampling points with the signal amplitude larger than 0 in each 16 sampling points from the first sampling point to obtain the value X. And calculating 32 groups by analogy, wherein each group comprises 16 sampling points to obtain X1-X32, and the value range is [0,16].
Using X1 to X32 to make the following similarity calculation for 16 items in table 1, taking sym0 as an example:
if the chip [ n ] corresponding to Sym0 is 1, calculating |16-Xn |, if the chip [ n ] corresponding to Sym0 is 0, calculating | Xn-0|, obtaining Yn, and so on, obtaining Y1-Y31 corresponding to 31 bits in the chip corresponding to Sym0, and then calculating the sum of Y1-Y31 to obtain the similarity S0 of Sym 0. S0 to S15 corresponding to sym0 to sym15 were obtained by the above methods, respectively. And then comparing S0 to S15 to obtain the minimum number, wherein the sym corresponding to the minimum number is a despreading result. If there are multiple minimum numbers, the sym with the minimum value is taken as the despreading result. The similarity is calculated as shown in figure 2.
The present embodiment provides a signal processing method, including: and despreading the PSDU part of the zigbee signal demodulated by the MSK, wherein each zigbee signal is despread independently so as to avoid the introduction of correlation errors between the two when the MSK is converted into the O-QPSK and avoid the ambiguity generated by threshold selection when sampling points are combined. Further comprising: the PSDU part of the zigbee baseband signal demodulated by the MSK is despread by storing pre-transcoding and similarity soft decision calculation, so that errors caused by correlation between front and rear chips when the MSK is converted into the O-QPSK are avoided, and ambiguity caused by threshold selection when sampling points are combined is avoided.
Specifically, the signal processing method further includes: the processing of the zigbee baseband signal is performed based on the MSK demodulated receiver, and comprises the following steps: the zero intermediate frequency zigbee baseband signal sequentially undergoes low-pass filtering, MSK demodulation, frame synchronization, frequency offset compensation, header information extraction, PSDU de-spreading and symbol-to-bit conversion.
Further, in the signal processing method, to improve the overall sensitivity of the MSK demodulated receiver, the PSDU despreading includes: obtaining a coding table through O-QPSK and MSK mathematical derivation; the receiver samples the zigbee chip bit signal with the rate of 2M/s by 16 times at the rate of 32M/s; obtaining a first sampling point of the PSDU through a frame synchronization module; sequentially calculating the number of sampling points with the signal amplitude larger than 0 in each 16 sampling points from the first sampling point to obtain a numerical value X; and calculating 32 groups by analogy, wherein each group comprises 16 sampling points to obtain X1-X32, and the value range is [0,16]. Respectively calculating similarities S0-S15 with sym 0-sym 15, comparing S0-S15, and taking sym corresponding to the minimum value in S0-S15; calculating the similarities S0 to S15 with sym0 to sym15 includes: judging whether chip [ n ] is 1, if so, calculating |16-Xn |, otherwise, calculating | Xn-0|, and obtaining Yn; the sum of Y1 to Y31 is obtained to obtain the similarity S0 of sym 0.
As shown in fig. 2, the signal processing method further includes: using X1-X32 to respectively calculate the following similarity of 0000-1111, and analogizing Sym 0-Sym 15 by using a signal Sym0 corresponding to 0000 as an example: if chip [ n ] corresponding to Sym0 is 1, calculating |16-Xn | to obtain Yn; if chip [ n ] corresponding to Sym0 is 0, calculating | Xn-0| to obtain Yn; and so on to obtain Y1-Y31 corresponding to 31 bits in the chip corresponding to sym0, and then summing Y1-Y31 to obtain similarity S0 of sym 0; respectively obtaining S0-S15 corresponding to sym 0-sym 15 by the method; then S0-S15 are compared to obtain the minimum number, and the corresponding sym is the de-spread result; if there are multiple minimum numbers, the sym with the minimum number is taken as the despreading result.
The present embodiment also provides a signal processing system, including: an MSK-demodulated receiver configured to demodulate the zigbee signal MSK; and a de-spreading module configured to de-spread the PSDU part of the zigbee signals demodulated by the MSK, wherein each zigbee signal is de-spread independently, so as to avoid introducing correlation errors between the two signals when the MSK is converted into the O-QPSK, and avoid ambiguity generated by threshold selection when sampling points are combined.
Specifically, in the signal processing system, the despreading module includes: the storage pre-transcoding module is configured to de-spread the PSDU part of the zigbee baseband signal demodulated by the MSK through storage pre-transcoding; and the similarity soft decision calculation module is configured to despread the PSDU part of the zigbee baseband signal demodulated by the MSK through similarity soft decision calculation.
Further, in the signal processing system, the MSK demodulation receiver includes: the low-pass filtering module is configured to perform low-pass filtering processing on a zigbee baseband signal of zero intermediate frequency to be subjected to MSK demodulation; and the MSK demodulation module is configured to carry out MSK demodulation on the zigbee baseband signal with zero intermediate frequency.
In addition, in the signal processing system, the method further includes: the frame synchronization module is configured to perform frame synchronization processing on the zero intermediate frequency zigbee baseband signal demodulated by the MSK; the frequency offset compensation module is configured to perform frequency offset compensation processing on the zero intermediate frequency zigbee baseband signal after frame synchronization processing; the head information extraction module is configured to extract head information of the zero intermediate frequency zigbee baseband signal after the frequency offset compensation processing and before the PSDU despreading processing; and a symbol-to-bit conversion module configured to perform symbol-to-bit conversion processing on the zero intermediate frequency zigbee baseband signal after PSDU despreading processing.
In the signal processing method and system provided by the invention, the PSDU part of the zigbee baseband signal demodulated by the MSK is despread by storing the pre-transcoding and the similarity soft decision calculation, and the following two purposes can be simultaneously achieved: 1) And errors introduced by the correlation of front and back chips in the conversion from MSK to O-QPSK are avoided. 2) The ambiguity generated by threshold selection when the sampling points are combined is avoided; the invention achieves unexpected technical effects because of the simultaneous solution of two technical problems.
In summary, the above embodiments have described the different configurations of the signal processing method in detail, and it is needless to say that the present invention includes but is not limited to the configurations listed in the above embodiments, and any modifications made on the configurations provided by the above embodiments are all within the scope of protection of the present invention. One skilled in the art can take the contents of the above embodiments to take a counter-measure.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the description of the method part.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (10)
1. A signal processing method, comprising:
and despreading the PSDU part of the zigbee signals demodulated by the MSK, wherein each zigbee signal is despread independently, so that correlation errors of the two are prevented from being introduced when the MSK is converted into the O-QPSK, and ambiguity generated by threshold selection when sampling points are combined is avoided.
2. The signal processing method of claim 1, further comprising:
the PSDU part of the zigbee baseband signal demodulated by the MSK is despread by storing pre-transcoding and similarity soft decision calculation, so that errors caused by correlation between front and rear chips when the MSK is converted into the O-QPSK are avoided, and ambiguity caused by threshold selection when sampling points are combined is avoided.
3. The signal processing method of claim 1, further comprising:
the processing of the zigbee baseband signal is performed based on the MSK demodulated receiver, and comprises the following steps:
the zero intermediate frequency zigbee baseband signal sequentially undergoes low-pass filtering, MSK demodulation, frame synchronization, frequency offset compensation, header information extraction, PSDU despreading and symbol-to-bit conversion.
4. A signal processing method according to claim 3, wherein to improve the overall sensitivity of the MSK demodulated receiver, the PSDU despreading comprises:
obtaining a coding table through O-QPSK and MSK mathematical derivation;
the receiver samples the 2M/s rate zigbee chip bit signal by 16 times at the rate of 32M/s;
obtaining a first sampling point of the PSDU by a frame synchronization module;
sequentially calculating the number of sampling points with the signal amplitude larger than 0 in each 16 sampling points from the first sampling point to obtain a numerical value X;
and calculating 32 groups by analogy, wherein each group comprises 16 sampling points to obtain X1-X32, and the value range is [0,16].
5. The signal processing method of claim 4, further comprising:
calculating similarities S0 to S15 with sym0 to sym15, comparing S0 to S15, and taking sym corresponding to the minimum value of S0 to S15;
calculating the similarities S0 to S15 with sym0 to sym15 includes:
judging whether chip [ n ] is 1, if so, calculating |16-Xn |, otherwise, calculating | Xn-0|, and obtaining Yn;
the similarity S0 of sym0 is obtained by summing Y1 to Y31.
6. The signal processing method of claim 5, further comprising:
using X1-X32 to respectively calculate the following similarity of 0000-1111, and analogizing Sym 0-Sym 15 by using a signal Sym0 corresponding to 0000 as an example:
if the chip [ n ] corresponding to Sym0 is 1, calculating |16-Xn | to obtain Yn;
if chip [ n ] corresponding to Sym0 is 0, calculating | Xn-0| to obtain Yn;
and so on to obtain Y1-Y31 corresponding to 31 bits in the chip corresponding to sym0, and then summing Y1-Y31 to obtain similarity S0 of sym 0;
respectively obtaining S0-S15 corresponding to sym 0-sym 15 by the method;
then S0-S15 are compared to obtain the minimum number, and the corresponding sym is the de-spread result;
if there are multiple minimum numbers, the sym with the minimum value is taken as the despreading result.
7. A signal processing system, comprising:
an MSK-demodulating receiver configured to MSK-demodulate the zigbee signal; and
and the de-spreading module is configured to de-spread the PSDU part of the zigbee signals demodulated by the MSK, and each zigbee signal is de-spread independently so as to avoid introducing correlation errors of the two signals when the MSK is converted into the O-QPSK and avoid ambiguity generated by threshold selection when sampling points are combined.
8. The signal processing method of claim 7, wherein the despreading module comprises:
the storage pre-transcoding module is configured to de-spread the PSDU part of the zigbee baseband signal demodulated by the MSK through storage pre-transcoding; and
and the similarity soft decision calculation module is configured to despread the PSDU part of the zigbee baseband signal demodulated by the MSK through similarity soft decision calculation.
9. The signal processing method of claim 7, wherein the MSK demodulated receiver comprises:
the low-pass filtering module is configured to perform low-pass filtering processing on a zigbee baseband signal of zero intermediate frequency to be subjected to MSK demodulation; and
the MSK demodulation module is configured to carry out MSK demodulation on the zigbee baseband signal with the zero intermediate frequency.
10. The signal processing method of claim 7, further comprising:
the frame synchronization module is configured to perform frame synchronization processing on the zero intermediate frequency zigbee baseband signal demodulated by the MSK;
the frequency offset compensation module is configured to perform frequency offset compensation processing on the zero intermediate frequency zigbee baseband signal after frame synchronization processing;
the head information extraction module is configured to extract head information of the zero intermediate frequency zigbee baseband signal after the frequency offset compensation processing and before the PSDU despreading processing; and
and the symbol-to-bit conversion module is configured to perform symbol-to-bit conversion processing on the zero intermediate frequency zigbee baseband signal after PSDU despreading processing.
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