CN112022057B - Capsule cystoscope signal receiving method based on improved SIMO algorithm - Google Patents
Capsule cystoscope signal receiving method based on improved SIMO algorithm Download PDFInfo
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- CN112022057B CN112022057B CN202010843756.8A CN202010843756A CN112022057B CN 112022057 B CN112022057 B CN 112022057B CN 202010843756 A CN202010843756 A CN 202010843756A CN 112022057 B CN112022057 B CN 112022057B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/307—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor for the urinary organs, e.g. urethroscopes, cystoscopes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00002—Operational features of endoscopes
- A61B1/00004—Operational features of endoscopes characterised by electronic signal processing
- A61B1/00009—Operational features of endoscopes characterised by electronic signal processing of image signals during a use of endoscope
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00002—Operational features of endoscopes
- A61B1/00011—Operational features of endoscopes characterised by signal transmission
- A61B1/00016—Operational features of endoscopes characterised by signal transmission using wireless means
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/04—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances
- A61B1/041—Capsule endoscopes for imaging
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/024—Channel estimation channel estimation algorithms
- H04L25/0256—Channel estimation using minimum mean square error criteria
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
- H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2657—Carrier synchronisation
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- 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
Abstract
The invention relates to the technical field of medical equipment, in particular to a capsule cystoscope signal receiving method based on an improved SIMO algorithm, which comprises the following steps: a) Performing matched filtering and synchronous detection on the received signals, and then performing CFO estimation and correction; b) Carrying out orthogonal channel demodulation on the data stream subjected to CFO estimation and correction, and then carrying out channel estimation and SIMO decoding; c) The data flow after SIMO decoding carries out digital demodulation after phase estimation to obtain a demodulated data flow; d) And carrying out RS decoding on the demodulated data stream to obtain communication information. The invention has the following substantial effects: the invention uses diversity reception in the wireless reception of the capsule cystoscope, and can lead the wireless reception radio frequency performance to be more superior, reduce the power consumption and the time delay and improve the stability of the capsule cystoscope video signal through improving the SIMO algorithm processing.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to a capsule cystoscope signal receiving method based on an improved SIMO algorithm.
Background
A capsule endoscope, also called a capsule endoscope (capsule endoscopy), is a capsule-shaped endoscope, which is a medical instrument used to examine the human body. The capsule endoscope can enter the human body and is used for peeping the health condition of the parts of the human body such as intestines, stomach, esophagus and the like. Is used for helping doctors diagnose diseases of the digestive tract system of patients. The capsule lens is placed in the cavity of the human organ, images are shot, and the images are transmitted to a data transmission device tied between the waist of the patient through wireless communication. Orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) is one type of multicarrier modulation. The parallel transmission of high-speed serial data is realized through frequency division multiplexing, and the parallel transmission device has better multipath fading resistance and is commonly used in communication of capsule mirrors. At present, in the wireless receiving process of capsule mirror video streams in the market, the traditional method in the industry is single antenna receiving, when the result is channel interference, especially Rayleigh fading, the error rate and the frame error rate can be increased, the wireless receiving of capsule cystoscope uses double antenna diversity receiving, and the wireless receiving radio frequency performance can be more superior through algorithm processing in a processor.
As in chinese patent CN106922121a, publication date 2017, 7, 4, capsule endoscope system, capsule endoscope, wireless communication method and program for capsule endoscope, capsule endoscope system having a capsule endoscope and receiving device. The capsule endoscope temporarily stores acceleration data when degradation of a wireless communication environment is detected. After detecting the restoration of the communication environment, the capsule endoscope transmits the stored acceleration data to the receiving device. The receiving means receives the image data and the acceleration data from the capsule endoscope. The receiving device detects a position of the capsule endoscope from the image data and the acceleration data. The method adopts a mode of temporarily storing data to improve the effect of final communication, but is not suitable for a capsule endoscope for transmitting video data in real time, and cannot solve the technical problem of unstable signal receiving of a capsule cystoscope.
Disclosure of Invention
The invention aims to solve the technical problems that: and the capsule cystoscope signal receiving is unstable. A capsule cystoscope signal receiving method based on an improved SIMO algorithm is provided. The invention can make the radio frequency receiving performance more excellent and reduce the power consumption and time delay through the algorithm processing in the communication signal processor.
In order to solve the technical problems, the invention adopts the following technical scheme: the capsule cystoscope signal receiving method based on the improved SIMO algorithm is used for receiving a receiver for receiving signals sent by a capsule cystoscope, and the capsule cystoscope is communicated with the receiver through a double-antenna OFDM mode, and comprises the following steps of: a) Performing matched filtering and synchronous detection on the received signals, and then performing CFO estimation and correction; b) Carrying out orthogonal channel demodulation on the data stream subjected to CFO estimation and correction, and then carrying out channel estimation and SIMO decoding; c) The data flow after SIMO decoding carries out digital demodulation after phase estimation to obtain a demodulated data flow; d) And carrying out RS decoding on the demodulated data stream to obtain communication information. Carrier frequency offset (carrier frequency offset, CFO), which is a problem in signal transmission of wireless communication, requires estimation and correction, and uses OFDM to perform diversity reception, thereby improving stability of communication and reducing power consumption and delay.
Preferably, in step B), the method for performing channel estimation and SIMO decoding includes: b1 Extracting real part and imaginary part data from the data stream Rs after CFO estimation and correction, performing channel estimation and storage, extracting a 2X 2 matrix J, and performing J 'J to obtain an output matrix A of the step, wherein J' is a transposed matrix of J; b2 Calculating the inverse matrix A of A -1 Calculate matrix b=a -1 * A, obtaining an output matrix B of the step; b3 Calculating a matrix C=J'/|A|B, obtaining and storing an output matrix C of the step; b4 Calculating vector output d=rs×c, where vector output D is a solution of SIMO decoding. By improving the SIMO algorithm, the stability of wireless communication is improved. The 2 x 2 matrix J is extracted by the real and imaginary parts respectively forming two columns of data of the first row, the real and imaginary parts of the next data in the second row data stream Rs.
Preferably, the inverse matrix A of A is calculated in step B2) -1 The method of (1) is as follows: calculating a transfer matrix z=j '/|a|, and calculate J' A|/| I A I 2 To reduce the computational complexity, the matrix B is calculated using Z. The computational complexity is reduced, so that the time delay of communication is reduced.
Preferably, in step a), the method for matched filtering the received signal includes: and carrying out direct current removal processing on the received signal, then carrying out sign taking processing to obtain a normalized signal, carrying out matched filtering processing on the normalized signal and outputting the normalized signal.
Preferably, in step a), the method for performing CFO estimation includes: when the capsule cystoscope sends out signals, the same pilot frequency symbols are inserted in the same subcarrier positions in the front OFDM symbol and the rear OFDM symbol, and when a receiver receives the received signals, the CFO estimated value is obtained according to the phase difference of the two pilot frequency symbols.
Preferably, in the step B), the method for performing channel estimation includes: and carrying out Fourier transformation on the symbol set of the part of the received signals to obtain a conversion result of the symbol set of the part of the received signals in a frequency domain, and enabling a subset of pilot symbols of the part of the received signals to execute minimum mean square error equalization on the symbol set after Fourier transformation to calculate channel estimation of the transmission channel.
The invention has the following substantial effects: the invention uses diversity reception in the wireless reception of the capsule cystoscope, and can lead the wireless reception radio frequency performance to be more superior, reduce the power consumption and the time delay and improve the stability of the capsule cystoscope video signal through improving the SIMO algorithm processing.
Drawings
Fig. 1 is a flowchart of a signal receiving method according to an embodiment.
Fig. 2 is a block flow diagram of a channel estimation and SIMO decoding method according to an embodiment.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings.
Embodiment one:
a capsule cystoscope signal receiving method based on an improved SIMO algorithm, which is used for receiving a receiver for sending signals by a capsule cystoscope, wherein the capsule cystoscope and the receiver are communicated in a double-antenna OFDM mode, as shown in fig. 1, and the embodiment comprises the following steps: a) And carrying out matched filtering and synchronous detection on the received signals, and then carrying out CFO estimation and correction. The method for carrying out matched filtering on the received signal comprises the following steps: and carrying out direct current removal processing on the received signal, then carrying out sign taking processing to obtain a normalized signal, carrying out matched filtering processing on the normalized signal and outputting the normalized signal. The method for performing CFO estimation includes: when the capsule cystoscope sends out signals, the same pilot frequency symbols are inserted in the same subcarrier positions in the front OFDM symbol and the rear OFDM symbol, and when a receiver receives the received signals, the CFO estimated value is obtained according to the phase difference of the two pilot frequency symbols.
B) And carrying out orthogonal channel demodulation on the data stream subjected to CFO estimation and correction, and then carrying out channel estimation and SIMO decoding. As shown in fig. 2, the method for performing channel estimation and SIMO decoding includes: b1 Extracting real part and imaginary part data from the data stream Rs after CFO estimation and correction, performing channel estimation and storage, extracting a 2X 2 matrix J, and performing J 'J to obtain an output matrix A of the step, wherein J' is a transposed matrix of J; b2 Calculation of (c)Inverse matrix A of A -1 Calculate matrix b=a -1 * A, obtaining an output matrix B of the step; b3 Calculating a matrix C=J'/|A|B, obtaining and storing an output matrix C of the step; b4 Calculating vector output d=rs×c, where vector output D is a solution of SIMO decoding. Calculating the inverse matrix A of A in step B2) -1 The method of (1) is as follows: calculating a transfer matrix z=j '/|a|, and calculate J' A|/| I A I 2 To reduce the computational complexity, the matrix B is calculated using Z. The method for carrying out channel estimation comprises the following steps: and performing Fourier transformation on the symbol set of the part of the received signal to obtain a conversion result of the symbol set of the part of the received signal in a frequency domain, so that a subset of pilot symbols of the part of the received signal performs minimum mean square error equalization on the Fourier transformed symbol set to calculate channel estimation of a transmission channel.
C) The SIMO decoded data stream is digitally demodulated after phase estimation to obtain a demodulated data stream.
D) And carrying out RS decoding on the demodulated data stream to obtain communication information. Carrier frequency offset (carrier frequency offset, CFO), which is a problem in signal transmission of wireless communication, requires estimation and correction, and uses OFDM to perform diversity reception, thereby improving stability of communication and reducing power consumption and delay.
The beneficial effects of this embodiment are: the invention uses diversity reception in the wireless reception of the capsule cystoscope, and can lead the wireless reception radio frequency performance to be more superior, reduce the power consumption and the time delay and improve the stability of the capsule cystoscope video signal through improving the SIMO algorithm processing.
The above-described embodiment is only a preferred embodiment of the present invention, and is not limited in any way, and other variations and modifications may be made without departing from the technical aspects set forth in the claims.
Claims (1)
1. A capsule cystoscope signal receiving method based on an improved SIMO algorithm, which is used for receiving a receiver for sending signals by a capsule cystoscope, and the capsule cystoscope is communicated with the receiver through a double-antenna OFDM mode, and is characterized by comprising the following steps:
a) Performing matched filtering and synchronous detection on the received signals, and then performing CFO estimation and correction;
b) Carrying out orthogonal channel demodulation on the data stream subjected to CFO estimation and correction, and then carrying out channel estimation and SIMO decoding;
c) The data flow after SIMO decoding carries out digital demodulation after phase estimation to obtain a demodulated data flow;
d) RS decoding is carried out on the demodulated data stream, and communication information is obtained;
in step B), the method for performing channel estimation and SIMO decoding includes:
b1 Extracting real and imaginary data from CFO estimated and corrected data stream Rs, making channel estimation and storage, extracting 2×2 matrix J, making J ′ * J, obtaining an output matrix A of the step, wherein J ′ A transposed matrix of J; b2 Calculating the inverse matrix A of A -1 Calculate matrix b=a -1 * A, obtaining an output matrix B of the step;
b3 Calculating a matrix c=j ′ Obtaining and storing an output matrix C of the step;
b4 Calculating vector output d=rs×c, where vector output D is a solution of SIMO decoding;
calculating the inverse matrix A of A in step B2) -1 The method of (1) is as follows:
calculating the transfer matrix z=j ′ i/A and calculate J ′ *|A|/||A|| 2 To reduce the computational complexity, a Z is used to calculate matrix B;
in step a), the method for performing matched filtering on the received signal includes: carrying out DC removal processing on the received signal, then carrying out sign taking processing to obtain a normalized signal, carrying out matched filtering processing on the normalized signal and outputting the normalized signal;
inserting the same pilot frequency symbol into the same subcarrier position in the OFDM symbol, and obtaining a CFO estimated value according to the phase difference of the two pilot frequency symbols when a receiver receives a received signal;
in the step B), the method for carrying out channel estimation comprises the following steps: and performing Fourier transformation on the symbol set of the part of the received signal to obtain a conversion result of the symbol set of the part of the received signal in a frequency domain, so that a subset of pilot symbols of the part of the received signal performs minimum mean square error equalization on the Fourier transformed symbol set to calculate channel estimation of a transmission channel.
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