CN109768833A - A kind of method and receiver improving receiver dynamic range - Google Patents
A kind of method and receiver improving receiver dynamic range Download PDFInfo
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- CN109768833A CN109768833A CN201910252175.4A CN201910252175A CN109768833A CN 109768833 A CN109768833 A CN 109768833A CN 201910252175 A CN201910252175 A CN 201910252175A CN 109768833 A CN109768833 A CN 109768833A
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Abstract
A kind of method and receiver improving receiver dynamic range, it is related to receiver field in space optical communication system, method is comprising steps of after to received optical signal amplification, signal decaying is carried out by adjustable attenuator, optical signal and local oscillator laser after decaying carry out coherent detection reception together, and are converted to electric signal and carry out Digital Signal Processing；Calculated signal power value adjusts the attenuation coefficient of adjustable attenuator according to the comparing result of signal power value and threshold value in real-time acquisition Digital Signal Processing.The present invention had not only taken into account real-time and the detectability to small signal under the premise of guaranteeing sensitivity, but big signal by when reduce and be distorted, improve the dynamic range of receiver.
Description
Technical field
The present invention relates to receiver field in space optical communication system, in particular to a kind of raising receiver dynamic model
The method and receiver enclosed.
Background technique
Space Optical Communication Technologies combine the advantages of fiber optic communication and microwave communication, since laser communication working frequency is high,
High directivity and have transmission code rate high, the advantages that nature size is small, strong security, while not needing to be laid with a large amount of optical fiber, can
Cost is greatly reduced, therefore after its feasibility is verified, becomes the hot spot that various countries put into a large amount of manpower and material resources researchs.
However, the particles such as gas molecule, snow, mist, aerosol can cause light in atmosphere due to the randomness of atmospheric channel
Absorb and dispersion, especially in strong turbulence, optical signal be easy it is heavily disturbed, along with space optical communication is usually
It is carried out between two mobile platforms, dual-mode antenna has slightly deviation in communication process, reaches the light signal strength of receiver
A bigger decaying will be generated, causes signal very small.And it is preferable in space channel condition, transmitting end signal issues letter
It is number bigger, it is likely that cause received signal excessive.
Therefore the dynamic range of receiver in space optical communication system study just necessary.It is logical in order to improve light
The dynamic range of receiver in letter system, scientific research personnel propose some solutions, but much regulating time mistakes in method
It is long, lead to the demand for not being able to satisfy real-time, and the dynamic range raising of received signal power is limited.
Summary of the invention
In view of the deficiencies in the prior art, the purpose of the present invention is to provide a kind of raising receiver dynamic ranges
Method and receiver had not only taken into account real-time and the detectability to small signal, but also in big signal under the premise of guaranteeing sensitivity
By when reduce distortion, improve the dynamic range of receiver.
To achieve the above objectives, on the one hand, a kind of method for improving receiver dynamic range is taken, comprising steps of
After received optical signal amplification, signal decaying, optical signal and local oscillator after decaying are carried out by adjustable attenuator
Laser carries out coherent detection reception together, and is converted to electric signal and carries out Digital Signal Processing；
Calculated signal power value in Digital Signal Processing is obtained in real time, according to the comparison knot of signal power value and threshold value
Fruit adjusts the attenuation coefficient of adjustable attenuator.
Preferably, the threshold value includes highest threshold value and lowest threshold, when signal power value is greater than the highest threshold value,
Increase attenuation coefficient；When signal power value is less than the lowest threshold, reduce attenuation coefficient；When lowest threshold≤signal power
When value≤highest threshold value, keep attenuation coefficient constant.
Preferably, the attenuation coefficient has highest threshold value and minimum threshold, when signal power value be greater than it is described most
High threshold, or when being less than the lowest threshold: if attenuation coefficient is equal to or more than highest threshold value, attenuation coefficient is maintained at most
High threshold；If attenuation coefficient is equal to or less than minimum threshold, attenuation coefficient is maintained at minimum threshold；If minimum threshold
When < attenuation coefficient < highest threshold value, the attenuation coefficient of adjusting is set.
Preferably, the correspondence table for presetting an analog voltage and attenuation coefficient needs to increase by corresponding table acquisition
Analog voltage corresponding to the big or attenuation coefficient of reduction, and declining using corresponding analog voltage control adjustable attenuator
Subtract index variation.
On the other hand, a kind of receiver is provided, space optical communication system is suitable for, comprising:
Optical Preamplifier is used to amplify received signal；
Adjustable attenuator is used to tentatively decay to the signal that Optical Preamplifier amplifies；
Local oscillator laser is used to generate local oscillator laser；
The coherent detection of integrated coherent receiver, optical signal and local oscillator laser after being used to complete tentatively to decay receives,
And be converted to electric signal；
Analog-digital converter is used to the analog signal that integrated coherent receiver exports being converted to digital signal；
Digital signal processing module is used to receive the digital signal and completes signal processing, passes through real time algorithm meter
Calculate signal power value；
Control module is used for real time access digital signal processing module, signal power value is read, according to signal power value
With the comparing result of threshold value, the attenuation coefficient of adjustable attenuator is adjusted；
Digital analog converter, be used for by control module export digital signal be converted to analog signal input to it is adjustable
Attenuator.
Preferably, the threshold value includes highest threshold value and lowest threshold, and the attenuation coefficient is with highest threshold value and most
Threshold ones, control module adjust attenuation coefficient according to the comparing result of signal power value and threshold value and include:
When signal power value is higher than highest threshold value, by attenuation coefficient plus 1；If plus the attenuation coefficient after 1 is greater than or waits
In highest threshold value, then attenuation coefficient is maintained at highest threshold value, otherwise keeps adding the attenuation coefficient after 1；
When signal power value is lower than lowest threshold, attenuation coefficient is subtracted 1；If the attenuation coefficient after subtracting 1 is less than or waits
In minimum threshold, then attenuation coefficient is maintained at highest lower limit value, otherwise keeps the attenuation coefficient after subtracting 1.
Preferably, the control module presets the correspondence table of an analog voltage and attenuation coefficient, control module
After the signal power value for receiving digital signal processing module output, it is compared with threshold value and obtains attenuation coefficient；Control unit
The corresponding analog voltage of attenuation coefficient is obtained by inquiring corresponding table, calculates the corresponding digital voltage value of the analog voltage,
Analog voltage is converted to by digital analog converter again, the input voltage value as adjustable attenuator.
Preferably, the digital signal processing module calculates signal power value in real time, and is stored in a register, institute
State control unit circulation read register in signal power value, and with the threshold value comparison.
Preferably, the attenuator presets an initial value, and the initial value is to decline in specified receiving sensitivity
The attenuation coefficient of minimum bit-error rate can be reached by subtracting rear signal.
Preferably, it is equipped with automatic gain control circuit inside the integrated coherent receiver, for passing through automatic gain control
Make the size of the electric signal.
A technical solution in above-mentioned technical proposal has the following beneficial effects:
1, by that can significantly improve in error code with the use of preposition amplification, integrated coherent reception and adjustable attenuator
The power bracket of receivable signal under rate index request can improve the inspection to small signal under the premise of guaranteeing sensitivity
Survey ability, and problem of dtmf distortion DTMF is solved when big signal passes through.
2, digital signal processor, adjustable attenuator and control module are provided with and form an effective closed-loop control system
System is remarkably improved the speed of dynamic range tracking, meets the needs of real-time, and reduce the complexity of circuit and algorithm.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of receiver of the embodiment of the present invention；
Fig. 2 is the flow chart that control module adjusts attenuation coefficient in the embodiment of the present invention.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and embodiments.
The present invention provides a kind of embodiment of method for improving receiver dynamic range, comprising steps of
The amplification of gain controllable is carried out, to the optical signal that receiver receives to improve signal-to-noise ratio.Amplified optical signal is logical
It crosses adjustable attenuator and carries out signal decaying；Optical signal and local oscillator laser after decaying carry out coherent detection reception together, and convert
For electric signal.Electric signal after conversion is by carrying out Digital Signal Processing after Analog-digital Converter.Digital signal processing packet
It includes: completing depolarization multiplexing, the clock synchronization, offset estimation, phase estimation of signal, digital carrier restores and judgement, and in real time
Calculate signal power value.Control module obtains calculated signal power value in Digital Signal Processing in real time, according to signal power
The comparing result of value and threshold value, adjusts the attenuation coefficient of adjustable attenuator.
Above-mentioned threshold value includes highest threshold value and lowest threshold, when signal power value is greater than highest threshold value, increases decaying system
Number；When signal power value is less than the lowest threshold, reduce attenuation coefficient；When lowest threshold≤signal power value≤highest threshold
When value, keep attenuation coefficient constant.
Preferably, the amount that attenuation coefficient is adjusted each time is plus or minus one.Also, adjustable attenuator is equipped with highest threshold value
And minimum threshold, under the premise of signal power value is greater than highest threshold value or signal power value is less than the lowest threshold:
When attenuation coefficient is equal to or more than highest threshold value, attenuation coefficient is maintained at highest threshold value；When attenuation coefficient is equal to or small
When minimum threshold, attenuation coefficient is maintained at minimum threshold；When minimum threshold < attenuation coefficient < highest threshold value,
The then attenuation coefficient that adjustable attenuator setting is adjusted.
Preferably, the correspondence table for presetting an analog voltage and attenuation coefficient will be adjusted by corresponding table acquisition
The corresponding analog voltage of attenuation coefficient, the input voltage value using analog voltage as adjustable attenuator, control it is adjustable
The attenuation coefficient of attenuator changes.
As shown in Figure 1, providing a kind of embodiment of receiver according to the above method, it is suitable for space optical communication system, it should
Receiver includes Optical Preamplifier, adjustable attenuator, local oscillator laser, integrated coherent receiver, analog-digital converter, number
Word signal processing module, control module and digital analog converter.
Specifically, Optical Preamplifier can carry out gain controllable to the optical signal that link comes according to signal power size
Amplification, to improve signal-to-noise ratio.Optical signal is amplified into adjustable attenuator and is tentatively decayed.Adjustable attenuator can be arranged
One initial value, the initial value are in specified receiving sensitivity, and attenuated signal can reach the attenuation coefficient of minimum bit-error rate.
For generating local oscillator laser, the optical signal and local oscillator laser being attenuated are admitted to integrated relevant above-mentioned local oscillator laser
Receiver carries out coherent detection reception, and is converted to electric signal；Meanwhile automatic growth control is equipped with inside integrated coherent receiver
Circuit, for tentatively carrying out the automatic adjustment of gain according to the size of electric signal, when electric signal is smaller, gain is in larger
Value, can may amplify the signal to suitable value；When signal is larger, automatic gain module is controlled, and gain is turned down.
After the electric signal of integrated coherent receiver output is converted to digital signal by analog-digital converter, it is input to number
Word signal processing module is handled.The depolarization multiplexing, clock synchronization, frequency deviation that digital signal processing module completes signal are estimated
Meter, phase estimation, digital carrier restores and judgement, calculates signal power value by real time algorithm.
Real-time calculated signal power value is stored in a register by digital signal processing module, and control module is followed
Ring reads the signal power value in register, and by being compared with threshold value and threshold value, the attenuation coefficient adjusted.
As shown in Fig. 2, threshold value includes highest threshold value V_ by taking the signal power value Val that control module is once read as an example
Thr_H and lowest threshold V_thr_L specifically compares and adjusting attenuation coefficient process is as follows:
S1. control module reads signal power value Val from digital signal processing module.
S2. judge whether the Val read is greater than V_thr_H, if so, into S3；If not, into S6.
S3. it needs attenuation coefficient A adding 1, obtains adjusting attenuation coefficient A1。
S4. judge A1Whether the highest threshold value A_H of adjustable damping coefficient is greater than or equal to, if so, into S5；If
It is no, into S11.
S5. the attenuation coefficient that adjustable attenuator is arranged is A_H, is terminated.
S6. judge whether the Val read is less than V_thr_L, if so, into S8；If not, into S7.
S7. keep the attenuation coefficient of adjustable attenuator constant.
S8. it needs to subtract 1 for attenuation coefficient A, obtains adjusting attenuation coefficient being A2。
S9. judge A2Whether the minimum threshold A_L of adjustable damping coefficient is less than or equal to, if so, into S10；Such as
Fruit is no, into S11.
S10. the attenuation coefficient that adjustable attenuator is arranged is A_L, is terminated.
S11. the attenuation coefficient that adjustable attenuator is arranged is to obtain adjusting attenuation coefficient, and according to plus or minus one, A is arranged1Or
A2, terminate.
In addition, control module presets the correspondence table of an analog voltage and attenuation coefficient, control module receives number
After the signal power value of word signal processing module output, according to above-mentioned steps, the attenuation coefficient that is adjusted.Then it searches and corresponds to
Table obtains the corresponding analog voltage of the attenuation coefficient.What it is due to control unit output is digital voltage, and adjustable attenuator needs
What is inputted is analog voltage, therefore the analog voltage found in corresponding table is first calculated as number by digital analog converter
Then voltage value exports digital voltage value to digital analog converter, is converted to analog voltage, the analog voltage that will be converted out
As the input voltage value of adjustable attenuator, adjustable attenuator is adjusted with this.
In above-described embodiment, signal-to-noise ratio is can be improved in Optical Preamplifier, but signal may be amplified excessively, therefore be adopted
With the automatic gain control of integrated coherent receiver.But the dynamic range of the automatic gain control of integrated coherent receiver only has
About 10dB, so being adjusted by digital signal processing module and control module and adjustable attenuator by signal is further
Section, when integrated coherent receiver signal is excessive, can solve the range of linearity beyond gain adjustment, signal cannot be adjusted to
The problem of desired value.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
Under the premise of the principle of the invention, several improvements and modifications can also be made, these improvements and modifications are also considered as protection of the invention
Within the scope of.The content being not described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (10)
1. a kind of method for improving receiver dynamic range, which is characterized in that comprising steps of
After received optical signal amplification, signal decaying, optical signal and local oscillator laser after decaying are carried out by adjustable attenuator
Coherent detection reception is carried out together, and is converted to electric signal and is carried out Digital Signal Processing；
Calculated signal power value in Digital Signal Processing is obtained in real time, according to the comparing result of signal power value and threshold value,
Adjust the attenuation coefficient of adjustable attenuator.
2. improving the method for receiver dynamic range as described in claim 1, it is characterised in that: the threshold value includes highest threshold
Value and lowest threshold,
When signal power value is greater than the highest threshold value, increase attenuation coefficient；
When signal power value is less than the lowest threshold, reduce attenuation coefficient；
When lowest threshold≤signal power value≤highest threshold value, keep attenuation coefficient constant.
3. improving the method for receiver dynamic range as claimed in claim 2, it is characterised in that: the attenuation coefficient has most
High threshold and minimum threshold, when signal power value is greater than the highest threshold value, or is less than the lowest threshold,
If attenuation coefficient is equal to or more than highest threshold value, attenuation coefficient is maintained at highest threshold value；
If attenuation coefficient is equal to or less than minimum threshold, attenuation coefficient is maintained at minimum threshold；
If the attenuation coefficient of adjusting is arranged when minimum threshold < attenuation coefficient < highest threshold value.
4. improving the method for receiver dynamic range as claimed in claim 2, it is characterised in that: preset a simulation electricity
The correspondence table of pressure value and attenuation coefficient is obtained by corresponding table and needs analog voltage corresponding to the attenuation coefficient of increase or reduction
Value, and using the attenuation coefficient variation of corresponding analog voltage control adjustable attenuator.
5. a kind of receiver is suitable for space optical communication system characterized by comprising
Optical Preamplifier is used to amplify received signal；
Adjustable attenuator is used to tentatively decay to the signal that Optical Preamplifier amplifies；
Local oscillator laser is used to generate local oscillator laser；
The coherent detection of integrated coherent receiver, optical signal and local oscillator laser after being used to complete tentatively to decay receives, and turns
It is changed to electric signal；
Analog-digital converter is used to the analog signal that integrated coherent receiver exports being converted to digital signal；
Digital signal processing module is used to receive the digital signal and completes signal processing, calculated by real time algorithm
Signal power value；
Control module is used for real time access digital signal processing module, signal power value is read, according to signal power value and threshold
The comparing result of value adjusts the attenuation coefficient of adjustable attenuator；
Digital analog converter is used to being converted to analog signal and inputing to adjustable damping the digital signal that control module exports
Device.
6. receiver as claimed in claim 5, it is characterised in that: the threshold value includes highest threshold value and lowest threshold, described
Attenuation coefficient has highest threshold value and minimum threshold, and control module is adjusted according to the comparing result of signal power value and threshold value
Attenuation coefficient includes:
When signal power value is higher than highest threshold value, by attenuation coefficient plus 1；If plus the attenuation coefficient after 1 is greater than or equal to most
Attenuation coefficient is then maintained at highest threshold value by high threshold, otherwise keeps adding the attenuation coefficient after 1；
When signal power value is lower than lowest threshold, attenuation coefficient is subtracted 1；If the attenuation coefficient after subtracting 1 is less than or equal to most
Attenuation coefficient is then maintained at highest lower limit value by threshold ones, otherwise keeps the attenuation coefficient after subtracting 1.
7. receiver as claimed in claim 6, it is characterised in that: the control module preset an analog voltage and
The correspondence table of attenuation coefficient is compared after control module receives the signal power value of digital signal processing module output with threshold value
Relatively and obtain attenuation coefficient；Control unit obtains the corresponding analog voltage of attenuation coefficient by inquiring corresponding table, calculates the mould
The quasi- corresponding digital voltage value of voltage value, then analog voltage is converted to by digital analog converter, as the defeated of adjustable attenuator
Enter voltage value.
8. receiver as claimed in claim 5, it is characterised in that: the digital signal processing module calculates signal power in real time
Value, and is stored in a register, and described control unit circulation reads the signal power value in register, and with the threshold value
Compare.
9. receiver as claimed in claim 5, it is characterised in that: the attenuator presets an initial value, the initial value
For in specified receiving sensitivity, attenuated signal can reach the attenuation coefficient of minimum bit-error rate.
10. receiver as claimed in claim 5, it is characterised in that: be equipped with automatic gain inside the integrated coherent receiver
Control circuit, for the size by electric signal described in automatic growth control.
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