WO2015096094A1 - Procédé de modulation de signal et de récupération d'informations numériques, dispositif de communication et système - Google Patents

Procédé de modulation de signal et de récupération d'informations numériques, dispositif de communication et système Download PDF

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Publication number
WO2015096094A1
WO2015096094A1 PCT/CN2013/090569 CN2013090569W WO2015096094A1 WO 2015096094 A1 WO2015096094 A1 WO 2015096094A1 CN 2013090569 W CN2013090569 W CN 2013090569W WO 2015096094 A1 WO2015096094 A1 WO 2015096094A1
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WIPO (PCT)
Prior art keywords
signal
pilot
digital information
frequency
loaded
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PCT/CN2013/090569
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English (en)
Chinese (zh)
Inventor
罗小东
冯志勇
何俊
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2013/090569 priority Critical patent/WO2015096094A1/fr
Priority to CN201380004244.0A priority patent/CN104904173B/zh
Publication of WO2015096094A1 publication Critical patent/WO2015096094A1/fr

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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
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication

Definitions

  • the present invention relates to the field of communications, and in particular, to a signal modulation, digital information recovery method, communication device and system. Background technique
  • a WDM optical network status monitoring method based on pilot signals has emerged, specifically: modulating a unique pilot signal with a unique frequency on each wavelength channel for identification
  • the pilot signal is detected to identify the corresponding wavelength, and the optical power of the corresponding wavelength channel is calculated.
  • a method of digitally modulating the pilot signal occurs, and the pilot detection signal demodulates the modulated pilot signal to recover the transmitted digital information. Since the pilot signal modulated on the optical signal is relatively weak, the amount of alternating current of the pilot signal and the direct current of the optical signal will be less than 5%, and the signal-to-noise ratio SNR of the pilot signal is very small.
  • the prior art adopts a scheme: sampling a pilot signal carrying digital information by using a FFT window of a certain length, and then determining a sampling value by a threshold, and recovering according to the algorithm.
  • the digital information modulated on the pilot signal For the calculation of the decision threshold, because of the ASK modulation method, there is a symbol 0 in the digital information. When the symbol 0 appears, it means that there is no pilot. Only when the symbol 1 appears, the pilot can be detected. Therefore, the decision threshold is calculated. It is necessary to determine a certain number of symbols 1 for a relatively long period of time, and the decision threshold can be calculated based on the noise level and the pilot strength on symbol 1.
  • a pilot detection node monitors fiber links of multiple dimensions. Therefore, the input fiber of the pilot detection is switched in real time, so that the requirement for real-time detection is very high, and the method for calculating the threshold is not satisfied. Real-time requirements. Summary of the invention
  • the embodiment of the invention provides a signal modulation and digital information recovery method, a communication device and a system, which can utilize the dual pilot signals carried in the signal to calculate the decision threshold in real time, thereby improving the calculation efficiency of recovering digital information, and reducing the time. Delay.
  • the first aspect of the embodiment of the present invention provides a communication device, including:
  • a first pilot generating module configured to load digital information onto the carrier signal to generate a first pilot signal, where the frequency of the carrier signal is
  • a second pilot generating module configured to generate a second pilot signal that is not loaded with digital information, where the frequency of the second pilot signal is f 2 , f 2 ⁇ f x ;
  • An adder configured to add the first pilot signal and the second pilot signal to generate a total pilot signal modulator, configured to modulate the total pilot signal into a signal to be loaded with a pilot, Get the signal loaded with the pilot.
  • the method further includes:
  • a frequency allocation module configured to select, according to a preset pilot frequency allocation table, the f 2 and the second pilot signal respectively allocated to the carrier signal.
  • the maximum amplitude of the carrier signal is equal or proportional to the maximum amplitude of the second pilot signal.
  • a second aspect of the embodiments of the present invention provides a communications device, including:
  • a first filtering module configured to filter a signal loaded with a pilot to obtain a first pilot signal, where the first pilot signal is generated by loading digital information onto a carrier signal, and the frequency of the carrier signal is f
  • a second filtering module configured to perform filtering processing on the pilot-loaded signal to obtain a second pilot signal, where the second pilot signal does not carry digital information, and the frequency of the second pilot signal is f 2 , i 2 1 1 ,
  • a first analog-to-digital conversion module configured to perform analog-to-digital conversion on the first pilot signal to obtain first digital information
  • a second analog-to-digital conversion module configured to perform analog-to-digital conversion on the second pilot signal to obtain second digital information
  • a digital information recovery module configured to calculate a decision threshold according to the second digital information, and recover the digital information from the first digital information by using the threshold.
  • the pilot-loaded signal is an electrical signal carrying a pilot
  • the communications device further includes:
  • a photoelectric conversion module configured to filter before the first filtering module and the second filtering module - Converting the pilot-loaded optical signal to the pilot-loaded electrical signal.
  • the method further includes:
  • an amplification module configured to perform an isolated DC and amplitude amplification process on the pilot-loaded electrical signal, and then input to the first filtering module and the second filter module.
  • the maximum amplitude of the carrier signal is equal or proportional to the maximum amplitude of the second pilot signal relationship.
  • the sampling frequency of the second analog-to-digital conversion module is less than 2 f 2 .
  • the digital information is a binary sequence
  • the digital information recovery module includes:
  • a first FFT unit configured to perform fast Fourier transform FFT processing on the first digital information to obtain a first frequency domain sequence
  • a second FFT unit configured to perform FFT processing on the second digital information to obtain a second frequency domain sequence ⁇ 1 J;
  • a first power calculation unit configured to calculate a first signal power corresponding to a frequency in the first frequency domain sequence
  • a second power calculation unit configured to calculate a second signal power and a signal to noise ratio corresponding to the frequency f 2 in the second frequency domain sequence
  • a threshold calculation unit configured to calculate a decision threshold according to the second signal power and the signal to noise ratio
  • a digital information recovery unit configured to recover the digital information after determining the first signal power according to the decision threshold.
  • the digital information recovery unit is configured to: if the first signal power ⁇ , > ⁇ , the first letter - The decision of the power corresponding bit is 1 and if P ⁇ , the decision is 0.
  • a third aspect of the embodiments of the present invention provides a method for modulating a signal, including:
  • the total pilot signal is modulated into a signal to be loaded with a pilot to obtain a pilot-loaded signal.
  • the method before the step of loading the digital information into the carrier signal to generate the first pilot signal, the method further includes:
  • the sum and the 4 are respectively assigned to the carrier signal and the second pilot signal from a preset pilot frequency allocation table.
  • the maximum amplitude of the carrier signal is equal or proportional to the maximum amplitude of the second pilot signal.
  • a fourth aspect of the present invention provides a method for recovering digital information, including:
  • the pilot-loaded signal is an electrical signal loaded with a pilot, and the pilot-loaded signal is filtered to obtain a first pilot signal. Before the steps, it also includes:
  • the pilot-loaded optical signal is converted to the pilot-loaded electrical signal.
  • the maximum amplitude of the carrier signal is equal or proportional to the maximum amplitude of the second pilot signal.
  • the step of converting the second pilot signal into the second digital information comprises: performing undersampling processing on the second pilot signal to obtain second digital information, where the sampling frequency is less than
  • the digital information is a binary sequence
  • the determining a threshold is calculated according to the second digital information
  • the step of recovering the digital information from the first digital information by the threshold includes:
  • the step of recovering the digital information after the first signal power is determined includes:
  • the ratio of the maximum amplitude of the signal to the maximum amplitude of the second pilot signal is a decision threshold, which is the second signal power, ⁇ 2 is the noise power of the second pilot signal, ⁇ is a constant, 0 ⁇ ⁇ ⁇ 1;
  • the bit corresponding to the first signal power is determined as
  • a fifth aspect of the embodiments of the present invention provides a communication device, including a processor and a memory, where the memory stores a set of program codes, and the processor calls the program code stored in the memory to perform the following operations:
  • the processor is further configured to: select, according to a preset pilot frequency allocation table, the sum and the respectively allocated to the carrier signal, and Second pilot signal.
  • the maximum amplitude of the carrier signal is equal or proportional to the maximum amplitude of the second pilot signal.
  • a sixth aspect of the embodiments of the present invention provides a communication device, including a processor and a memory, where the memory stores a set of program codes, and the processor calls the program code stored in the memory to perform the following operations:
  • the pilot-loaded signal is an electrical signal carrying a pilot
  • the processor is further configured to:
  • the pilot-loaded optical signal is converted to the pilot-loaded electrical signal.
  • the maximum amplitude of the carrier signal is equal or proportional to the maximum amplitude of the second pilot signal.
  • the processor performs the analog-to-digital conversion on the second pilot signal to obtain a second
  • the steps of digital information include:
  • the sampling frequency is less than 2 f 2 .
  • the digital information is a binary sequence
  • the processor performs the calculating a threshold according to the second digital information, And recovering the digital information from the first digital information by using the threshold
  • the steps include:
  • the processor is further configured to perform the calculating a threshold according to the second signal power and the signal to noise ratio And the step of restoring the digital information after determining the first signal power according to the determining threshold includes:
  • the ratio of the maximum amplitude of the signal to the maximum amplitude of the second pilot signal is a decision threshold, which is the second signal power, ⁇ 2 is the noise power of the second pilot signal, ⁇ is a constant, 0 ⁇ ⁇ ⁇ 1;
  • the bit corresponding to the first signal power is judged to be 1, if the decision is 0.
  • a seventh aspect of the embodiments of the present invention provides a communication system, including any one of the foregoing communication devices.
  • the transmitting end can calculate the decision threshold according to the second pilot signal in real time, and recover the digital information modulated in the first pilot signal by using the decision threshold, thereby solving the problem that the calculation threshold threshold waiting time is long and the efficiency is not high.
  • FIG. 1 is a schematic structural diagram of a communication device according to a first embodiment of the present invention.
  • FIG. 2 is a schematic diagram of frequency distribution in the pilot frequency allocation table of FIG. 1;
  • FIG. 3 is another schematic structural diagram of a communication device according to a second embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a communication device according to a third embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a communication device according to a fourth embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of the digital information recovery module of FIG. 5;
  • FIG. 7 is a schematic structural diagram of a communication device according to a fifth embodiment of the present invention.
  • FIG. 8 is a schematic flowchart diagram of a signal modulation method according to an embodiment of the present invention.
  • FIG. 9 is a schematic flowchart diagram of a method for restoring digital information according to an embodiment of the present invention.
  • FIG. 10 is a schematic flowchart of a specific process of S205 in FIG. detailed description
  • the communication device includes: a first pilot generation module 10, a second pilot generation module 11, and an addition. 12 and modulator 13.
  • the first pilot generating module 10 is configured to load digital information onto the carrier signal to generate a first pilot signal, where the frequency of the carrier signal is .
  • the digital information is a binary sequence
  • the first pilot signal is generated by performing 2ASK modulation on the carrier signal by using digital information
  • the carrier signal is a sinusoidal signal or a cosine signal, and its frequency.
  • the carrier signal is A*cos(2 r * ft)
  • A is the maximum amplitude of the carrier signal
  • the binary sequence s(t) J n g(t - nT s ), where T s is in the digital information
  • the first pilot signal e 2ASK A* cos(2 r * nT s ).
  • a second pilot generating module 11 for generating a second pilot signal without digital information, the frequency of the second pilot signal being f 2 , f 2 ⁇ fl .
  • the continual pilot generation module 11 generates an unmodulated second pilot signal having a frequency of f 2 , and the second pilot signal is preferably a sinusoidal signal or a cosine signal.
  • the second pilot signal is B*. Cos(2 ⁇ * f 2 *t), B is the maximum amplitude of the second pilot signal.
  • the maximum amplitude of the first pilot signal is equal or proportional to the maximum amplitude of the second pilot signal, the maximum amplitude of which is specified by the communication protocol common to both the transmitting end and the receiving end.
  • the adder 12 is configured to add the first pilot signal and the second pilot signal to generate a total pilot signal.
  • the adder 12 adds the first pilot signal generated by the first pilot generating module 10 and the second pilot signal generated by the continuous pilot signal generating module 11 to obtain a total pilot signal
  • the adder can be a digital addition method. Or analog adder.
  • the total pilot signal e A*cos(2r* f G - nT s ) + B*cos(2r* f 2 *t).
  • the modulator 13 is configured to load the pilot signal into the signal of the pilot signal to obtain a pilot-loaded signal.
  • the modulator modulates the total pilot signal into the signal to be loaded with the pilot to obtain a signal that matches the characteristics of the current channel.
  • the total pilot signal is loaded into the optical signal to obtain a suitable signal.
  • the mode of the optical modulation may use any one of direct modulation, intra-cavity modulation and extra-cavity modulation to modulate the total pilot signal into the optical signal, and generate the pilot-loaded optical signal.
  • the communication device of this embodiment further includes a frequency allocation module 14.
  • the frequency allocation module 14 is configured to select two unused frequencies from the preset pilot frequency allocation table to be respectively allocated to the carrier signal and the second pilot signal.
  • the frequency stored in the preset pilot frequency allocation table is divided into two pilot bands, which are a first pilot band and a second pilot band, respectively, and the first pilot band and the second pilot band do not overlap.
  • the first pilot band is distributed with a plurality of frequencies to be allocated to the carrier signal
  • the second pilot band is distributed with a plurality of frequencies to be allocated to the second pilot signal, and the frequency assigned to the carrier signal and the second pilot are allocated.
  • the frequency of the signal is not - - Equal, the frequencies in the first pilot band and the second pilot band carry identification information indicating their usage status.
  • a schematic diagram of the frequency distribution in the pilot frequency allocation table shown in FIG. 2 the frequency dividing the first pilot band a and the second pilot band b, the frequency in the first pilot band a is assigned to the carrier signal, and the second pilot band b The frequency in the second pilot signal is allocated to the second pilot signal.
  • the first pilot frequency band a is composed of N frequencies, respectively f al , f a2 , f a3 ... f aN
  • the second pilot frequency band b is composed of N frequencies, respectively Is f bl , f b2 , f b3 ⁇ f bN , where N is a positive integer.
  • the frequency of the first pilot band a may be lower than the frequency in the second pilot band b or higher than the frequency in the second pilot band b.
  • the frequency interval of the first pilot band a is df a
  • the frequency interval of the second pilot band b is df b , preferably, df a > df b .
  • the usage status of the frequency in the pilot frequency allocation table may be represented by a Bitmap, for example, 1 indicates that the frequency has been used, and 0 indicates that the frequency is not used.
  • the frequency allocation module 14 selects an unused frequency from the first pilot band as the frequency of the carrier signal, and selects the unused frequency f 2 as the frequency of the second pilot signal from the second pilot band.
  • the signal is added to generate a total pilot signal, and the total pilot signal is modulated onto the signal to be loaded with the pilot, so that the receiving end calculates the decision threshold according to the second pilot signal in real time, and the first pilot is recovered by using the threshold.
  • the digital information modulated in the signal solves the problem that the prior art calculation threshold threshold waiting time is long and the efficiency is not high.
  • the communication device 1 includes a processor 61, a memory 62, an input device 63, and an output device 64, which are in the communication device 1.
  • the number of processors 61 may be one or more, and FIG. 3 takes a processor as an example.
  • the processor 61, the memory 62, the input device 63, and the output device 64 may be connected by a bus or other means, and the bus connection is exemplified in FIG.
  • the memory 62 stores a set of program codes
  • the processor 61 is configured to call the program code stored in the memory 62 for performing the following operations:
  • the carrier signal is a sinusoidal signal or a cosine signal
  • the digital information loaded on the carrier signal is a binary sequence
  • the processor 61 performs the loading of the digital information onto the carrier signal.
  • the 2ASK modulation generates the first pilot signal.
  • the processor 61 is further configured to:
  • the maximum amplitude of the carrier signal is equal or proportional to the maximum amplitude of the second pilot signal.
  • the processor 61 executes
  • the step of modulating the total pilot signal into a signal to be loaded with a pilot to obtain a pilot-loaded signal includes:
  • the total pilot signal is modulated into the optical signal to obtain a pilot-loaded optical signal; wherein the modulation method includes any one of direct modulation, intracavity modulation, and extracavity modulation.
  • the recovery device includes a first filtering module 20, a second filtering module 21, and a first analog-to-digital conversion module 22.
  • the first filtering module 20 is configured to perform filtering processing on the signal loaded with the pilot to obtain a first pilot signal, where the first pilot signal is generated by loading digital information onto the carrier signal, and the frequency of the carrier signal is .
  • the first filtering module 20 can be implemented by using a center frequency as a band pass filter, and the signal loaded with the pilot is filtered by the first filtering module 20, and the first pilot signal is obtained after suppressing out-of-band noise of the first pilot signal. .
  • a second filtering module 21 configured to perform filtering processing on the pilot-loaded signal to obtain the second pilot signal, where the second pilot signal does not carry digital information, and the second pilot signal frequency
  • ⁇ ⁇ is f 2, f 2 ⁇ f 1.
  • the second filtering module 21 can be implemented by a band pass filter having a center frequency of f 2 , and the signal loaded with the pilot is filtered by the second filtering module 21 to suppress out-of-band noise of the second pilot signal. - - After getting the second pilot signal.
  • the first analog-to-digital conversion module 22 is configured to perform analog-to-digital conversion on the first pilot signal to obtain a first pilot sequence.
  • the first analog-to-digital conversion module 22 performs time domain sampling on the first pilot signal to obtain a first pilot sequence, and the sampling frequency of the first analog-to-digital conversion module 22 is greater than the Nyquist sampling frequency, that is, the sampling frequency is greater than f.
  • the length of each sample is the symbol duration of a digital information, for example, the symbol duration is T s , the subsequent examples are all for the decision method of the bit duration of one symbol, other bits The decision method of the bit is adopted by this method.
  • the second analog-to-digital conversion module 23 is configured to perform analog-to-digital conversion on the second pilot signal to obtain a second pilot sequence.
  • the second analog-to-digital conversion module 23 performs time domain sampling on the second pilot signal to obtain a second pilot sequence. Since the second pilot signal is an unmodulated single frequency signal, the sampling frequency offset is smaller than the Nyquist.
  • the sampling frequency can also recover the second pilot signal without distortion, that is, undersampling the second pilot signal to obtain a second pilot sequence, the sampling frequency is less than 2 f 2 , and the length of each sampling is not limited, and can also be T s , this can effectively reduce the amount of calculation.
  • the digital information recovery module 24 is configured to calculate a decision threshold according to the second pilot sequence, and recover the digital information from the first pilot sequence by using the threshold.
  • the digital information recovery module 24 performs discrete Fourier transform DFT processing on the first pilot sequence to obtain a corresponding first frequency domain sequence, and calculates a corresponding signal power on the frequency from the first frequency domain sequence, and the signal power is obtained. As the data to be judged.
  • the first analog-to-digital conversion module 22 and the second analog-to-digital conversion module 23 can be implemented by an ADC (Analog to Digital Converter), and the first pilot signal is respectively used by the two sampling channels of the ADC.
  • the sampling with the second pilot signal can also be implemented by two ADCs, which is not limited in the present invention.
  • the digital information recovery module 24 performs a discrete Fourier transform DFT on the second frequency domain sequence to obtain a second frequency domain sequence, and calculates corresponding signal power and noise power at each frequency point from the second frequency domain sequence, according to the transmitting end and
  • the communication protocol at the receiving end acquires the relationship between the maximum amplitude of the carrier signal and the maximum amplitude of the second pilot signal, calculates a decision threshold according to the maximum amplitude relationship between the signal power and the noise power meter, and uses the decision threshold to determine the decision data, if the data to be determined is to be determined If it is greater than the decision threshold, the judgment is 1 and the judgment is 0. This determines the frequency domain sequence of each sample and restores the second guide.
  • - - Digital information modulated in the frequency signal is a discrete Fourier transform DFT on the second frequency domain sequence to obtain a second frequency domain sequence, and calculates corresponding signal power and noise power at each frequency point from the second frequency domain sequence, according to the transmitting end and
  • the communication protocol at the receiving end acquire
  • the receiving end can calculate the decision threshold according to the second pilot signal in real time, and recover the digital information modulated in the first pilot signal by using the threshold, thereby solving the long waiting time for calculating the decision threshold, and the efficiency is not High deficiency.
  • FIG. 6 is a schematic structural diagram of a communication device according to a fourth embodiment of the present invention.
  • the communication device includes a first filtering module 20 and a second filtering module 21,
  • a photoelectric conversion module 25 and an amplification module 26 are further included.
  • the photoelectric conversion module 25 is configured to convert the pilot-loaded optical signal into a pilot-loaded electrical signal.
  • the photoelectric conversion module 20 converts the input pilot-loaded optical signal into an electrical signal
  • the photoelectric conversion module 25 can realize photoelectric conversion by the photodetector.
  • the pilot light signal is pre-modulated at the transmitting end with a total pilot signal generated by adding the first pilot signal and the second pilot signal, and the first pilot signal is digitally modulated by the digital information to the carrier signal of the frequency
  • the second pilot signal is generated as an unmodulated single frequency signal having a frequency f 2 , and the maximum amplitude of the carrier signal and the maximum amplitude of the second pilot signal are equal or fixed proportional relationship.
  • the amplifying module 26 is configured to perform an isolated DC and amplitude amplification process on the pilot-loaded electrical signal, and then input to the first filtering module and the second filter module.
  • the amplification module 26 suppresses the DC component in the electrical signal, and simultaneously amplifies the AC component therein and inputs the first filtering module 21 and the second filtering module 22.
  • the optical power calculation module 26 is configured to calculate optical power of the dimmed signal according to the second frequency domain sequence.
  • the digital information recovery module 24 includes a first FFT unit 241, a second FFT unit 242, a first power calculation unit 243, a second power calculation unit 244, a threshold calculation unit 245, and a digital information recovery unit 246.
  • the first FFT unit 241 is configured to perform fast Fourier transform FFT processing on the first pilot sequence to obtain a first frequency domain sequence.
  • the second FFT unit 242 is configured to perform FFT processing on the second pilot sequence to obtain a second frequency domain sequence.
  • a first power calculation unit 243 configured to calculate a frequency f in the first frequency domain sequence, corresponding to the first - - Signal power.
  • a second power calculation unit 244 configured to calculate a second signal power and a signal to noise ratio corresponding to the frequency f 2 in the second frequency domain sequence
  • the threshold calculation unit 245 is configured to calculate a decision threshold according to the second signal power and the signal to noise ratio.
  • the digital information restoring unit 246 is configured to recover the digital information after determining the first signal power according to the decision threshold.
  • the digital information restoring unit 246 is configured to: if the first signal power > ⁇ ⁇ , the bit corresponding to the first signal power has a decision of 1, and if Pth, the decision is 0.
  • FIG. 7 is a schematic structural diagram of a communication device according to a fifth embodiment of the present invention.
  • the following device is referred to as a communication device 2.
  • the communication device 2 includes a processor 71, a memory 72, an input device 73, and an output 7 64.
  • the recovery device 2 The number of processors 61 in the process may be one or more, and FIG. 7 takes a processor as an example.
  • the processor 71, the memory 72, the input device 73, and the output device 74 may be connected by a bus or other means, and the bus connection is taken as an example in FIG.
  • the memory 72 stores a set of program codes
  • the processor 71 is configured to call the program code stored in the memory 72 for performing the following operations:
  • the pilot loaded signal is an electrical signal loaded with a pilot.
  • the processor 71 is also used to execute:
  • the pilot-loaded optical signal is converted to the pilot-loaded electrical signal.
  • the processor 71 is further configured to:
  • the maximum amplitude of the carrier signal is equal or proportional to the maximum amplitude of the second pilot signal.
  • the step of the processor 71 performing the analog-to-digital conversion on the second pilot signal to obtain a second pilot sequence includes:
  • the processor 71 performs the calculating a threshold according to the second pilot sequence, and recovering the digital information from the first pilot sequence by using the threshold.
  • the steps include:
  • the processor 71 performs the determining a threshold according to the second signal power and the signal to noise ratio; and determining the first signal power according to the threshold
  • the steps of recovering the digital information include:
  • the ratio of the maximum amplitude of the signal to the maximum amplitude of the second pilot signal is a decision threshold, which is the second signal power, ⁇ 2 is the noise power of the second pilot signal, ⁇ is a constant, 0 ⁇ ⁇ ⁇ 1;
  • the bit corresponding to the first signal power is determined as
  • the modulation method comprises:
  • the digital information is a binary sequence
  • the frequency of the carrier signal is: the first pilot signal is generated by 2ASK modulation of the carrier signal by using digital information, and the carrier signal is a sinusoidal signal or a cosine signal, and its frequency.
  • T s is the symbol duration in the digital information
  • n is the digital information
  • the length of n n n is the value of the nth symbol, 0 or 1
  • the first pilot signal 6 2 (( ⁇ 2 ⁇ - nT s
  • an unmodulated second pilot signal having a frequency of f 2 is generated, and the second pilot signal is preferably a sinusoidal signal or a cosine signal.
  • the second pilot signal is cos(2 r * f 2 * t
  • the maximum amplitude of the second pilot signal is equal to or in a fixed proportional relationship with the maximum amplitude of the second pilot signal, and the maximum amplitude of the two is specified by a communication protocol common to both the transmitting end and the receiving end.
  • the total pilot signal is modulated into a signal to be loaded with a pilot to obtain a signal matching the current channel characteristic.
  • the total pilot signal is loaded into the optical signal to obtain a suitable optical fiber.
  • the signal transmitted in the wireless communication system the total pilot signal is loaded onto the high frequency carrier to obtain a signal suitable for transmission in the wireless channel.
  • the mode of the optical modulation may use any one of direct modulation, intra-cavity modulation and extra-cavity modulation to modulate the total pilot signal into the optical signal, and generate the pilot-loaded optical signal.
  • the method before S101, the method further includes the step of selecting, from the preset pilot frequency allocation table, two unused frequencies to be allocated to the carrier signal and the second pilot signal.
  • the frequency stored in the preset pilot frequency allocation table is divided into two pilot bands, which are a first pilot band and a second pilot band, respectively, and the first pilot band and the second pilot band do not overlap.
  • the first pilot band is distributed with a plurality of frequencies to be allocated to the carrier signal
  • the second pilot band is distributed with a plurality of frequencies to be allocated to the second pilot signal, and the frequency assigned to the carrier signal and the second pilot are allocated.
  • the frequencies of the signals are not equal, and the frequencies in the first pilot band and the second pilot band carry identification information indicating their use status.
  • - For example, a schematic diagram of the distribution of frequencies in the pilot frequency allocation table shown in FIG.
  • the frequency in the frequency band b is allocated to the second pilot signal
  • the first pilot frequency band a is composed of N frequencies, respectively f al , f a2 , f a3 ... f aN
  • the second pilot frequency band b is composed of N frequencies , respectively, f bl , f b2 , f b3 ⁇ f bN , where N is an integer.
  • the frequency of the first pilot band a may be lower than the frequency in the second pilot band b or higher than the frequency in the second pilot band b.
  • the frequency interval of the first pilot band a is df a
  • the frequency interval of the second pilot band b is df b , preferably, df a > df b .
  • the usage status of the frequency in the pilot frequency allocation table may be represented by a Bitmap, for example, 1 indicates that the frequency has been used, and 0 indicates that the frequency is not used.
  • the unused frequency fl is selected as the frequency of the carrier signal from the first pilot band, and the unused frequency f2 is selected as the frequency of the second pilot signal from the second pilot band.
  • FIG. 9 is a schematic flowchart of a method for restoring digital information according to an embodiment of the present invention.
  • the recovery method includes:
  • S205 specifically includes: S2051: performing fast Fourier transform FFT processing on the first pilot sequence to obtain a first frequency domain sequence.
  • S2052 Perform FFT processing on the second pilot sequence to obtain a second frequency domain sequence.
  • the ratio of the maximum amplitude of the carrier signal to the maximum amplitude of the second pilot signal is a decision threshold, which is the second signal power, N 2 is the noise power of the second pilot signal, and M is a constant , 0 ⁇ M ⁇ 1;
  • the bit bit of the symbol duration is judged to be 1, if The judgment is 0.
  • the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed.
  • the foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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  • Optical Communication System (AREA)

Abstract

　L'invention concerne un dispositif de communication qui comporte : un premier module d'occurrence de fréquence pilote pour charger des informations numériques sur un signal de porteuse afin de générer un premier signal de fréquence pilote, la fréquence du signal de porteuse étant f1; un second module d'occurrence de fréquence pilote pour générer un second signal de fréquence pilote qui n'est pas chargé avec des informations numériques, la fréquence du second signal de fréquence pilote étant f2, f2≠f1; un additionneur pour additionner le premier signal de fréquence pilote et le second signal de fréquence pilote afin de générer un signal de fréquence pilote total; un modulateur pour moduler le signal de fréquence pilote total en un signal devant être chargé avec une fréquence pilote afin d'obtenir un signal chargé avec la fréquence pilote. Un procédé et un système d'information numérique sont en outre décrits, et au moyen de la présente invention, un seuil de détermination peut être calculé en temps réel, les informations numériques peuvent être récupérées et le temps de propagation en réseau peut être réduit.
PCT/CN2013/090569 2013-12-26 2013-12-26 Procédé de modulation de signal et de récupération d'informations numériques, dispositif de communication et système WO2015096094A1 (fr)

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CN201380004244.0A CN104904173B (zh) 2013-12-26 2013-12-26 信号的调制及数字信息的恢复方法、通信设备及系统

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CN111130649B (zh) * 2019-12-20 2021-08-20 成都优博创通信技术股份有限公司 一种导频信号产生方法、装置及光模块

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