CN115396031B - Ultra-high-speed spatial optical communication combined carrier recovery method based on optical frequency comb - Google Patents
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Abstract
The invention discloses an ultra-high-speed spatial optical communication combined carrier recovery method based on an optical frequency comb. The adopted combined carrier recovery method comprises a multi-carrier frequency offset recovery process for eliminating carrier frequency offset and a combined carrier phase recovery process for eliminating residual carrier phase error. The algorithm provided by the invention can effectively eliminate the Doppler frequency offset with a large dynamic range caused by the relative motion of the receiving and transmitting terminals in the space optical communication process, and can calculate the phase variation of all carrier comb teeth by measuring the phase variation of part of carrier comb teeth in the wavelength division multiplexing communication system, thereby greatly saving the calculation resources and being suitable for the environment with limited space-borne calculation resources in the space optical communication system.
Description
Technical Field
The invention belongs to the technical field of carrier recovery in a laser communication system, and particularly relates to an ultra-high-speed spatial optical communication combined carrier recovery method based on an optical frequency comb.
Background
The combination of coherent optical communication and wavelength division multiplexing technology is a key technology for meeting the high-speed data transmission requirements of current ultra-high resolution remote sensing satellites and high throughput relay satellites and realizing the crossing of the capacity of a space communication system to Tbps magnitude, and the technology is used for carrying out information modulation on multi-channel carrier signals at a transmitting end and then transmitting the multi-channel carrier signals into a channel, and in the demodulation process of a receiving end, the accuracy and the complexity of a Digital Signal Processing (DSP) algorithm including carrier recovery directly influence the quality and the speed of information recovery.
The traditional wavelength division multiplexing communication system uses a laser array as a transmitting end light source, each laser in the array generates a single carrier wave, and the frequency offset and the phase change of each carrier wave signal need to be measured and respectively compensated in the carrier wave recovery algorithm process, so that the calculation and processing resource requirements are high. Therefore, the constraint condition that satellite load calculation resources are limited in the ultra-high-speed space optical communication scene cannot be met. In addition, the laser array structure is complex, the occupied space is large, the required power consumption is high, and the requirements on small satellite load volume and low power consumption cannot be met.
On the other hand, the traditional carrier recovery algorithm is mostly applied to the communication scene of the optical fiber channel, the stability of the propagation channel is higher, and no obvious relative motion exists between the receiving and transmitting terminals. There is no doppler shift caused by the doppler phenomenon. In the space optical communication scene, the space-borne receiving and transmitting terminals have high-speed and quick-change relative motion, so that high-frequency and quick-change Doppler frequency offset exists between the receiving and transmitting terminals. For such large dynamic range fast rate of change frequency offsets, conventional carrier recovery algorithms have difficulty meeting compensation requirements. In a space optical communication system of wavelength division multiplexing, a carrier recovery algorithm capable of compensating for a large dynamic frequency offset of multiple carriers and having low computational complexity is urgently needed.
Disclosure of Invention
The invention solves the technical problems that: the invention provides an ultra-high speed space optical communication combined carrier recovery method based on an optical frequency comb, which overcomes the defects of the prior art. Aiming at the characteristics and requirements of a space optical communication scene, the method fully utilizes the characteristics of an optical frequency comb, can eliminate Doppler carrier frequency offset with large dynamic range and quick change rate in the space optical communication process, can complete the phase recovery process of all carrier comb teeth according to the measurement result by only measuring the carrier phase change condition of part carrier comb teeth (main component comb teeth) at a receiving end, realizes a high-efficiency and low-complexity combined carrier recovery method, and meets the requirement of limited satellite load calculation resources.
The technical scheme of the invention is as follows:
in a first aspect of the present invention,
An ultra-high speed spatial optical communication joint carrier recovery method based on an optical frequency comb comprises the following steps:
1) Receiving N paths of carrier signals transmitted by the optical frequency comb at the transmitting end; selecting comb teeth with the median frequency of the carrier signal in the optical frequency comb at the transmitting end as calibration comb teeth at the transmitting end; according to the received N paths of carrier signals, the frequency f tx of the carrier signal corresponding to the calibration comb teeth of the transmitting end is obtained;
2) Selecting comb teeth with the median frequency of the carrier signal in the optical frequency comb at the receiving end as calibration comb teeth at the receiving end; obtaining a difference value between the frequency f tx of the carrier signal corresponding to the calibration comb teeth of the transmitting end and the frequency f rx of the carrier signal corresponding to the calibration comb teeth of the receiving end, and taking the difference value as the frequency offset delta f of the calibration comb teeth;
3) Compensating the frequency of the carrier signal generated by the calibration comb teeth at the receiving end by using the frequency offset deltaf of the calibration comb teeth obtained in the step 2) to obtain the frequency f c' of the carrier signal after compensation;
4) Repeating the steps 1) to 3) until the frequency offset delta f of the calibration comb teeth meets the threshold requirement, and entering the step 5);
5) Obtaining an offset coefficient A according to the frequency offset delta f meeting the threshold requirement and the frequency f c' of the carrier signal obtained after compensation;
6) Determining carrier frequency offset delta f n corresponding to each path of carrier signal in the local optical frequency comb according to the offset coefficient A obtained in the step 5) and the repetition frequency f r of the local optical frequency comb;
7) Respectively compensating the frequency of each path of carrier signal in the local optical frequency comb by utilizing the carrier frequency offset delta f n corresponding to each path of carrier signal in the local optical frequency comb determined in the step 6), so as to obtain N paths of local carrier signals after frequency compensation;
8) Sequentially carrying out frequency mixing processing on the N paths of carrier signals received in the step 1) and the N paths of frequency-compensated local carrier signals obtained in the step 7) to obtain N paths of baseband signals; the number of the baseband signal corresponds to the number of the carrier signal generated by the local optical frequency comb; the serial numbers of the carrier signals generated by the local optical frequency comb are sequentially numbered from small to large according to the frequency of the carrier signals;
9) Selecting two paths of baseband signals from the N paths of baseband signals as main component signals, and respectively measuring the variation phi m (t) and phi n (t) of the phases of the two paths of main component signals along with time according to a sampling period;
10 Obtaining the phase change of the rest (N-2) roadbed signals according to the phase change phi m (t) and phi n (t) of the two paths of main component signals obtained in the step 9) along with time;
11 And (3) compensating the variation of the baseband signal phase obtained in the step (10) along with time to the corresponding baseband signal to finish the combined carrier recovery method.
Preferably, the threshold requirement in step 4) is specifically: Δf < f 0,f0 is the line width value of the calibration comb teeth of the receiving end.
Preferably, the method for obtaining the offset coefficient a in step 5) specifically includes:
A＝Δf/fc′。
preferably, the method of step 6) for determining the carrier frequency offset Δf n corresponding to each path of carrier signal in the local optical frequency comb specifically includes:
wherein n is the number from the calibration comb teeth to the comb teeth at two sides.
Preferably, in step 9), m is 1 and N is N.
Preferably, in step 10), the method for obtaining the phase change of the remaining (N-2) baseband signal with time is specifically: for the variation of the kth baseband signal phase over time:
Preferably, the sampling period in step 9) has a value ranging from 80 to 120 milliseconds.
In a second aspect of the present invention,
A processing apparatus, comprising:
A memory for storing a computer program;
a processor for calling and running the computer program from the memory to perform the method of the first aspect.
A computer readable storage medium having stored therein a computer program or instructions which, when executed, implement the method of the first aspect.
A computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the first aspect.
Compared with the prior art, the invention has the advantages that:
1) The invention aims at the problem that the carrier wave has Doppler frequency shift with large dynamic range and quick change rate due to the high-speed and quick-change relative movement between satellite-borne receiving and transmitting terminals in a space optical communication scene.
2) Aiming at the problem that satellite load calculation resources are limited, and carrier recovery algorithm is difficult to independently finish for each path of carrier in a wavelength division multiplexing communication system, the invention selects partial carrier as a main component comb tooth in N paths of carrier comb teeth after a receiving end passes through a multi-carrier frequency offset recovery process, calculates carrier phase variation of other non-main component comb teeth according to a measuring result of carrier phase variation of the main component comb teeth along with time, compensates the carrier phase variation, and greatly saves precious calculation resources of satellite load.
Drawings
Fig. 1 is a schematic diagram of the overall scheme of the ultra-high speed spatial light communication joint carrier recovery method adopted in the invention;
fig. 2 is a flow chart of a joint carrier recovery method employed by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings.
The optical frequency comb has the characteristics of high frequency stability, good spectral line phase coherence, good flatness, integration and the like, and is very suitable for being used as a light source of a coherent light wavelength division multiplexing system to construct a spatial high-speed laser communication backbone network with ultra-large bandwidth and ultra-high spectral efficiency. The wavelength division multiplexing system based on the optical frequency comb has the characteristics of fixed repetition frequency and coherent phase among all paths of carrier comb teeth. Therefore, the complexity of the digital signal processing algorithm of the receiving end can be reduced through the joint carrier recovery technology.
The invention provides an ultra-high-speed spatial optical communication combined carrier recovery method based on an optical frequency comb, which comprises the steps of generating TX 1 and TX 2 … TX N common-N transmission carrier signals at a transmitting end through the optical frequency comb, and generating RX 1 and RX 2 … RX N common-N local carrier signals at a receiving end through a local optical frequency comb. The optical frequency comb comprises N carrier comb teeth, N paths of transmitting carrier signals are in one-to-one correspondence with N paths of local carrier signals, and the corresponding frequencies are the same. The general scheme is shown in fig. 1, and is divided into two parts, namely multi-carrier frequency offset recovery and joint carrier phase recovery. The frequency of N paths of carrier signals generated by the optical frequency comb is sequentially increased, and the frequency difference value of the carrier signals corresponding to two adjacent comb teeth is the repetition frequency f r of the optical frequency comb.
The main function of the multi-carrier frequency offset recovery part is to eliminate the high dynamic Doppler frequency offset of the carrier in the process of spatial coherent optical communication, and the capturing and tracking of the frequency offset of the N paths of received carrier signals are completed at the receiving end. The specific implementation idea is to select frequency median comb teeth TX C in N paths of transmitting carrier comb teeth and frequency median comb teeth RX C in N paths of local carrier comb teeth as calibration comb teeth, measure frequency difference values of the TX C and the RX C in real time and compensate the frequency difference values to the local optical frequency comb, and anchor the frequency between the multipath receiving carrier comb teeth and the local carrier comb teeth through the calibration comb teeth. After the frequency is anchored, the frequency offset of other carrier comb teeth except the calibration comb teeth is calculated by a calculation formula of the space Doppler frequency shift, and compensation is carried out.
The main function of the combined carrier phase recovery part is to measure and compensate the residual phase error of the carrier based on the capturing and tracking of the carrier frequency offset in the last part. The specific implementation idea is that partial carriers are selected from N paths of carrier comb teeth after a receiving end is subjected to a multi-carrier frequency offset recovery process to serve as main component comb teeth, the carrier phase change condition of the main component comb teeth is measured, and then carrier phase change amounts of other non-main component comb teeth are calculated according to measurement results and are compensated.
The flow of the combined carrier recovery method adopted by the invention is shown in fig. 2, and the specific implementation steps comprise:
Step S1: and selecting comb teeth TX C with the carrier signal frequency of the N paths of transmitting carrier comb teeth being a median number and comb teeth RX C with the carrier signal frequency of the N paths of local carrier comb teeth being a median number as calibration comb teeth, measuring and receiving the carrier signal transmitted by the calibration comb teeth TX C at a receiving end, and obtaining the difference value between the frequency f tx of the received carrier signal and the frequency f rx of the carrier signal transmitted by the local comb teeth RX C as the frequency offset delta f of the calibration comb teeth.
Step S2: and compensating the frequency f c of the carrier signal generated by the calibration comb teeth in the local optical frequency comb by taking the delta f as an error signal to obtain the frequency f c' of the carrier signal after compensation, so that the frequency of the local calibration comb teeth RX C is close to the receiving frequency of the carrier signal transmitted by the received calibration comb teeth TX C.
Step S3: repeating the steps S1-S2 until the delta f is smaller than f 0, and then carrying out the next step. At this time, frequency values of the calibration comb teeth TX C and RX C are used as anchor points to form a frequency anchoring relationship between the multipath receiving carrier comb teeth and the local carrier comb teeth. f 0 is a preset frequency offset threshold (f 0 can be set to a line width value of the calibration comb teeth). In the embodiment of the invention, the value range of f 0 is 10-50 kHz.
Step S4: obtaining an offset coefficient A according to the frequency offset delta f meeting the threshold requirement and the frequency f c' of the carrier signal obtained after compensation; a=Δf/f c';
Step S5: determining carrier frequency offset delta f n corresponding to each path of carrier signal in the local optical frequency comb according to the offset coefficient obtained in the step S4 and the repetition frequency f r of the optical frequency comb; the method comprises the following steps:
wherein n is the label from the calibration comb teeth to the comb teeth at two sides.
Step S6: the frequency of each path of carrier signal in the local carrier comb teeth is respectively compensated by utilizing the carrier frequency offset delta f n corresponding to each path of carrier signal in the local optical frequency comb determined in the step S5, so as to obtain a frequency compensated local carrier signal; and completing the frequency offset recovery process of all carrier signals.
Step S7: mixing the locally received multipath carrier signals with the local carrier signals subjected to frequency compensation processing to obtain N paths of baseband signals;
Step S8: after the multi-carrier frequency offset recovery process is completed, selecting a part of baseband signals from the N paths of baseband signals as main component signals (in the embodiment, selecting baseband signals corresponding to two paths of signals with lowest carrier signal frequency and highest carrier signal frequency as main component signals), respectively measuring the variation of the phases of the main component signals along with time according to sampling periods, wherein phi m (t) and phi n(t).φm (t) are marked to represent the variation of the phase of an m-th baseband signal in the N paths of baseband signals within one sampling period, and m is numbered as 1 in the embodiment of the invention; phi n (t) represents the variation of the phase of an nth baseband signal in N baseband signals within a sampling period, and N is N in the embodiment of the invention; in the embodiment of the invention, the sampling period is 80-120 milliseconds, and the sampling period is determined according to the computing capability of a processor at a receiving end.
Step S9: because the phases of the carrier signals transmitted by the optical frequency comb have a coherent relation, the phase variation phi m (t) and phi n (t) of the main component signals obtained in the step S8 are deduced to obtain the phase variation of the rest (N-2) roadbed signals along with time; that is, the phase change amount phi k (t) (k-th path) of any one baseband signal can be calculated from the known phase change amounts phi m (t) (m-th path) and phi n (t) (n-th path) of the other two baseband signals. The method comprises the following steps:
wherein, according to the frequency value of the carrier signal corresponding to the carrier comb teeth, the numbers are sequentially numbered from small to large, the number of the baseband signal corresponds to the number of the carrier comb teeth, and k is [1, N ].
Step S10: and (3) compensating the variation of each baseband signal phase with time, which is obtained in the step (S9), to the corresponding baseband signal, and compensating the phases of all the baseband signals to complete the phase recovery process of all the baseband signals. The combined carrier phase recovery method with high efficiency and low complexity can be realized.
The principle of frequency offset recovery in the method of the invention is as follows:
Taking the selected transmitting carrier wave to calibrate the comb teeth TX C as an example, assume that an optical frequency comb transmitting end is arranged at Moving in direction at a velocity v, propagation direction and/>, of the transmitting carrierThe included angle between the two is theta. For the receiving end, the doppler shift amount (i.e., Δf) of the carrier wave can be calculated by a mathematical lorentz formula, as shown in formula (1),
Where β=v/c, c represents the speed of light, and f represents the frequency of the optical carrier.
The fixed repetition frequency exists between each comb tooth of the optical frequency comb, and the generated carrier comb tooth frequency of each path can be expressed as
Wherein f n represents a carrier comb frequency value, N represents a relative position of carrier comb teeth and calibration comb teeth (total N paths of carrier comb teeth), f c represents a calibration comb frequency value, and f r represents a repetition frequency of an optical frequency comb. In the communication process, N paths of transmitting carrier comb teeth propagate through the same channel in the same time, the Doppler frequency offset has common mode characteristics, and the N paths of transmitting carrier comb teeth are connected with the formula (1) and the formula (2) in a combined way, and have the following characteristics that
In the foregoing steps S1 to S3, the carrier offset Δf of the optical frequency comb calibration comb teeth (when n=0) has been measured in real time, that is, Δf 0 =Δf. And (3) combining the frequency offset Deltaf n and Deltaf of the carrier comb teeth except the calibration comb teeth, so that the calculation relation between the frequency offset Deltaf n and Deltaf of the carrier comb teeth can be calculated. And compensating corresponding delta f n for each path of carrier wave to finish the frequency offset recovery process of all carrier waves.
Although the present application has been described in terms of the preferred embodiments, it is not intended to be limited to the embodiments, and any person skilled in the art can make any possible variations and modifications to the technical solution of the present application by using the methods and technical matters disclosed above without departing from the spirit and scope of the present application, so any simple modifications, equivalent variations and modifications to the embodiments described above according to the technical matters of the present application are within the scope of the technical matters of the present application. The embodiments of the present application and technical features in the embodiments may be combined with each other without collision.
What is not described in detail in the present specification is a well known technology to those skilled in the art.
Claims (10)
1. The ultra-high-speed spatial optical communication combined carrier recovery method based on the optical frequency comb is characterized by comprising the following steps of:
1) Receiving N paths of carrier signals transmitted by the optical frequency comb at the transmitting end; selecting comb teeth with the median frequency of the carrier signal in the optical frequency comb at the transmitting end as calibration comb teeth at the transmitting end; according to the received N paths of carrier signals, the frequency f tx of the carrier signal corresponding to the calibration comb teeth of the transmitting end is obtained;
2) Selecting comb teeth with the median frequency of the carrier signal in the optical frequency comb at the receiving end as calibration comb teeth at the receiving end; obtaining a difference value between the frequency f tx of the carrier signal corresponding to the calibration comb teeth of the transmitting end and the frequency f rx of the carrier signal corresponding to the calibration comb teeth of the receiving end, and taking the difference value as the frequency offset delta f of the calibration comb teeth;
3) Compensating the frequency of the carrier signal generated by the calibration comb teeth at the receiving end by using the frequency offset deltaf of the calibration comb teeth obtained in the step 2) to obtain the frequency f c' of the carrier signal after compensation;
4) Repeating the steps 1) to 3) until the frequency offset delta f of the calibration comb teeth meets the threshold requirement, and entering the step 5);
5) Obtaining an offset coefficient A according to the frequency offset delta f meeting the threshold requirement and the frequency f c' of the carrier signal obtained after compensation;
6) Determining carrier frequency offset delta f n corresponding to each path of carrier signal in the local optical frequency comb according to the offset coefficient A obtained in the step 5) and the repetition frequency f r of the local optical frequency comb;
7) Respectively compensating the frequency of each path of carrier signal in the local optical frequency comb by utilizing the carrier frequency offset delta f n corresponding to each path of carrier signal in the local optical frequency comb determined in the step 6), so as to obtain N paths of local carrier signals after frequency compensation;
8) Sequentially carrying out frequency mixing processing on the N paths of carrier signals received in the step 1) and the N paths of frequency-compensated local carrier signals obtained in the step 7) to obtain N paths of baseband signals; the number of the baseband signal corresponds to the number of the carrier signal generated by the local optical frequency comb; the serial numbers of the carrier signals generated by the local optical frequency comb are sequentially numbered from small to large according to the frequency of the carrier signals;
9) Selecting two paths of baseband signals from the N paths of baseband signals as main component signals, and respectively measuring the variation phi m (t) and phi n (t) of the phases of the two paths of main component signals along with time according to a sampling period;
10 Obtaining the phase change of the rest (N-2) roadbed signals according to the phase change phi m (t) and phi n (t) of the two paths of main component signals obtained in the step 9) along with time;
11 And (3) compensating the variation of the baseband signal phase obtained in the step (10) along with time to the corresponding baseband signal to finish the combined carrier recovery method.
2. The method for recovering the ultra-high-speed spatial optical communication combined carrier based on the optical frequency comb according to claim 1, wherein the threshold requirements in the step 4) are specifically as follows: Δf < f 0,f0 is the line width value of the calibration comb teeth of the receiving end.
3. The method for recovering the ultra-high-speed spatial optical communication combined carrier based on the optical frequency comb according to claim 1, wherein the method for obtaining the offset coefficient A in the step 5) is specifically as follows:
A＝Δf/fc′。
4. The method for recovering a carrier wave in combination with ultra-high speed spatial optical communication based on an optical frequency comb according to claim 1, wherein the method for determining the carrier frequency offset Δf n corresponding to each path of carrier signal in the local optical frequency comb in step 6) specifically comprises the following steps:
wherein n is the number from the calibration comb teeth to the comb teeth at two sides.
5. The method for recovering a joint carrier for ultra-high-speed spatial optical communication based on an optical frequency comb according to claim 1, wherein in the step 9), the m number is 1, and the N number is N.
6. The method for recovering ultra-high-speed spatial optical communication combined carrier based on optical frequency comb according to claim 5, wherein in step 10), the method for obtaining the variation of the phase of the rest (N-2) baseband signal with time is specifically as follows: for the variation of the kth baseband signal phase over time:
7. the method for recovering an ultra-high-speed spatial optical communication joint carrier based on an optical frequency comb according to claim 1, wherein the value range of the sampling period in the step 9) is 80-120 milliseconds.
8. A processing apparatus, comprising:
A memory for storing a computer program;
a processor for calling and running the computer program from the memory to perform the method of any of claims 1 to 7.
9. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program or instructions which, when executed, implement the method of any of claims 1 to 7.
10. A computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of any of claims 1 to 7.
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