CN108683457B - Self-modulation multi-carrier optical fiber wireless communication method and system - Google Patents
Self-modulation multi-carrier optical fiber wireless communication method and system Download PDFInfo
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- 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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
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- 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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
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- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
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Abstract
The invention provides a self-modulation multi-carrier optical fiber wireless communication method and a system, comprising the following steps: a plurality of binary digital baseband signal sources for generating binary digital baseband signals; a plurality of central station end sine carrier signal sources for generating a plurality of sine carrier signals; a plurality of central station side mixers for mixing the binary digital baseband signals and the sine carrier signals which correspond to each other to obtain a plurality of paths of single carrier signals; a power synthesizer for power synthesizing the multi-path single carrier signals to obtain multi-carrier signals; a semiconductor laser for modulating the multi-carrier signal onto an optical carrier to obtain an optical millimeter wave signal; and the photoelectric detector is used for beating the millimeter wave signal to obtain the millimeter wave signal. The realization complexity and cost are reduced through self-modulation, and meanwhile, multipath signals are transmitted simultaneously in a multi-carrier mode, so that the communication capacity is enlarged, the communication data volume is improved, and the communication efficiency is optimized.
Description
Technical Field
The invention relates to the technical field of optical fiber wireless communication, in particular to a self-modulation multi-carrier optical fiber wireless communication method and system.
Background
In the future, the fifth generation mobile communication technology (5G) will be commercially available, and millimeter wave technology is more critical to 5G. However, millimeter wave signals cannot be transmitted over long distances in the air, and it is difficult to achieve good communication effects by millimeter wave communication only using a wireless access technology. In order to solve this problem, a RoF (Radio over Fiber) technology is proposed, which combines the advantages of an optical access technology and a Radio access technology, that is, the huge bandwidth advantage of optical Fiber communication and the flexible access of mobile communication, and provides an ideal solution for solving the problems of high bandwidth, large capacity, mobility and the like for users, so that the RoF technology will become the most promising technology for broadband wireless access.
In the RoF system of the prior art, there are three main technologies for generating millimeter wave on optical carrier: self-modulation techniques, optical heterodyne modulation techniques, and external modulation techniques. The disadvantage of optical heterodyne modulation techniques is that two semiconductor lasers are required, and the presence of random phase noise will have a significant impact on the system. External modulation techniques often require the use of at least two modulators, one for modulating the baseband signal onto the optical carrier and one for suppressing, for example, the optical carrier signal or other sideband signal, to achieve optical carrier suppression or single sideband modulation, and thus, increase the cost of the central station. In contrast, the self-modulation technique is the easiest, simplest, and least costly method of all millimeter wave signal generation methods. However, the conventional self-modulation technology has a limited modulation bandwidth, so that the data volume of communication cannot be increased, and the communication efficiency is greatly affected.
Accordingly, the prior art is still in need of improvement and development.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art, and provides a self-modulation multi-carrier optical fiber wireless communication method and a system, which can improve the modulation bandwidth, thereby improving the data volume of communication and optimizing the communication efficiency.
The technical scheme adopted for solving the technical problems is as follows:
A self-modulating multi-carrier optical fiber wireless communication method comprises the following steps,
S1, acquiring a plurality of binary digital baseband signals which are different from each other and a plurality of sinusoidal carrier signals which are different from each other, wherein one binary digital baseband signal corresponds to one sinusoidal carrier signal;
S2, mixing the binary digital baseband signals and the sinusoidal carrier signals which correspond to each other to obtain multi-path single carrier signals;
s3, carrying out power synthesis on the multipath single carrier signals to obtain multicarrier signals;
S4, modulating the multi-carrier signal onto an optical carrier to obtain an optical millimeter wave signal;
s5, beating the millimeter wave signal to obtain the millimeter wave signal.
Compared with the prior art, the beneficial effects of the technical scheme are as follows: modulating the multi-carrier signal onto the optical carrier to obtain the optical millimeter wave signal, thereby realizing self-modulation, having the advantage of low realization complexity and reducing realization cost; meanwhile, a plurality of binary digital baseband signals and sinusoidal carrier signals which correspond to each other are mixed, then a multi-carrier signal is obtained after power synthesis, and the multi-channel signals are transmitted simultaneously in a multi-carrier mode, so that the communication capacity is enlarged, the communication data volume is improved, and the communication efficiency is optimized.
Further, in the step S4, the millimeter wave signal is a millimeter wave signal containing frequency components and optical carrier components of each order, and the step S4 further includes filtering the millimeter wave signal containing frequency components and optical carrier components of each order to obtain a millimeter wave signal containing only a positive first-order frequency component and optical carrier component;
In the step S5, the beat frequency of the millimeter wave signal is specifically: and obtaining the millimeter wave signal with the frequency of the frequency difference according to the frequency difference between the millimeter wave signal with the optical carrier wave of the positive first-order frequency component and the millimeter wave signal with the optical carrier wave component.
The beneficial effects of adopting above-mentioned scheme are: filtering the millimeter wave signal to remove other components to obtain the millimeter wave signal only containing the positive first-order frequency component and the optical carrier component, which can effectively prepare for the subsequent beat frequency; the beat frequency is performed according to the frequency difference between the millimeter wave signal of the optical carrier wave of the positive first-order frequency component and the millimeter wave signal of the optical carrier wave component, so that the generation of interference signals can be reduced.
Further, after the step S5, wireless transmission is further performed according to the millimeter wave signal;
the wireless transmission according to the millimeter wave signal comprises a first wireless transmission mode, wherein the first wireless transmission mode specifically comprises the following steps:
Performing band-pass filtering on the millimeter wave signals obtained by beat frequency to obtain multi-carrier signals after band-pass filtering;
amplifying power of the multi-carrier signal;
And transmitting the multicarrier signals with amplified power.
The beneficial effects of adopting above-mentioned scheme are: on one hand, interference signals are introduced in the beat frequency process, millimeter wave signals obtained by filtering the beat frequency can be effectively removed, and only multi-carrier signals are reserved; on the other hand, the multi-carrier signal is directly amplified in power and then transmitted, the terminal can receive the multi-carrier signal, and different terminals can demodulate the multi-carrier signal according to actual conditions.
Further, the wireless transmission according to the millimeter wave signal further includes a second wireless transmission mode, and the second wireless transmission mode specifically includes the following steps:
Performing power distribution on millimeter wave signals obtained by beat frequency to obtain multiple paths of same multi-carrier signals;
Respectively carrying out band-pass filtering treatment on the same multi-carrier signals in each path to obtain multi-path single-carrier signals with different center frequencies;
Amplifying the power of each single carrier signal;
transmitting each single carrier signal after power amplification.
The beneficial effects of adopting above-mentioned scheme are: different from directly amplifying the power of the multi-carrier signals and then transmitting the multi-carrier signals, the multi-carrier signals with the same paths are respectively subjected to band-pass filtering treatment to obtain multi-path single-carrier signals, and then each single-carrier signal is subjected to power amplification and then transmitted, so that the multi-carrier signal can be demodulated at a base station according to the actual condition of a terminal, and the load of the terminal is lightened.
Further, after the step S5, performing an error rate test according to the millimeter wave signal;
the error rate test according to the millimeter wave signal specifically comprises the following steps:
Performing band-pass filtering on the millimeter wave signals obtained by beat frequency to obtain multi-carrier signals after band-pass filtering;
Carrying out power distribution on the multi-carrier signals after band-pass filtering to obtain multiple paths of same multi-carrier signals;
Acquiring multiple paths of sine carrier signals which are different from each other;
Mixing each path of multi-carrier signal with a sinusoidal carrier signal corresponding to each path of multi-carrier signal, and moving a frequency spectrum component corresponding to each path of multi-carrier signal to a low frequency domain to obtain multi-path mixed multi-carrier signals;
respectively carrying out low-pass filtering processing on each path of mixed multi-carrier signal to obtain a plurality of binary digital baseband signals;
and performing error rate test according to the plurality of binary digital baseband signals.
The beneficial effects of adopting above-mentioned scheme are: the mixed multi-carrier signal is restored to binary digital baseband signal, and then bit error rate test is carried out, so that the communication quality can be conveniently evaluated.
A self-modulating multi-carrier optical fiber wireless communication system, comprising,
A plurality of binary digital baseband signal sources for generating a plurality of binary digital baseband signals different from each other;
a plurality of central station end sine carrier signal sources for generating a plurality of mutually different sine carrier signals, wherein one binary digital baseband signal corresponds to one sine carrier signal;
A plurality of central station side mixers for mixing the binary digital baseband signals and the sine carrier signals which correspond to each other to obtain a plurality of paths of single carrier signals;
a power synthesizer for power synthesizing the multi-path single carrier signals to obtain multi-carrier signals;
a semiconductor laser for modulating the multi-carrier signal onto an optical carrier to obtain an optical millimeter wave signal;
and the photoelectric detector is used for beating the millimeter wave signal to obtain the millimeter wave signal.
Further, the millimeter wave signal is a millimeter wave signal containing frequency components and optical carrier components of each order;
The system also comprises an optical band-pass filter, wherein the optical band-pass filter is used for filtering the optical millimeter wave signals containing all the order frequency components and the optical carrier components to obtain the optical millimeter wave signals only containing the positive first order frequency components and the optical carrier components;
The beat frequency of the photoelectric detector optical millimeter wave signal is specifically as follows: and obtaining the millimeter wave signal with the frequency of the frequency difference according to the frequency difference between the millimeter wave signal with the optical carrier wave of the positive first-order frequency component and the millimeter wave signal with the optical carrier wave component.
Further, the wireless transmission system further comprises a first wireless transmission module, wherein the first wireless transmission module comprises:
an electric band-pass filter for band-pass filtering the millimeter wave signal obtained from the beat frequency to obtain a multi-carrier signal after band-pass filtering;
A power amplifier for power amplifying the multi-carrier signal;
and an antenna for transmitting the power-amplified multicarrier signal.
Further, a second wireless transmission module is also included, the second wireless transmission module includes:
The power divider is used for carrying out power division on millimeter wave signals obtained by beat frequency to obtain multiple paths of same multi-carrier signals;
The plurality of electric band-pass filters respectively carry out band-pass filtering treatment on the same multi-carrier signals in each path to obtain multi-path single-carrier signals with different center frequencies;
A plurality of power amplifiers for power amplifying the respective single carrier signals;
and a plurality of antennas for transmitting the single carrier signals after power amplification.
Further, the system also comprises an error rate testing module, wherein the error rate testing module comprises:
an electric band-pass filter for band-pass filtering the millimeter wave signal obtained from the beat frequency to obtain a multi-carrier signal after band-pass filtering;
A power divider, configured to perform power division on the filtered multi-carrier signal to obtain multiple identical multi-carrier signals;
a plurality of base station end sine carrier signal sources for generating a plurality of paths of sine carrier signals which are different from each other;
The base station side mixers are used for respectively mixing each path of multi-carrier signal and a sinusoidal carrier signal corresponding to each path of multi-carrier signal, and moving frequency spectrum components corresponding to each path of multi-carrier signal to a low frequency domain to obtain multi-path mixed multi-carrier signals;
The plurality of electric low-pass filters are used for respectively carrying out low-pass filtering processing on the multi-carrier signals after the frequency mixing of each path and demodulating a plurality of binary digital baseband signals;
And the error rate tester is used for carrying out error rate test according to the demodulated multiple binary digital baseband signals.
Drawings
Fig. 1 is a flow chart of a method of self-modulating multi-carrier optical fiber wireless communication according to the present invention.
Fig. 2 is a schematic diagram of a self-modulating multi-carrier wireless communication system in accordance with the present invention.
Fig. 3 is a schematic diagram of a first wireless transmission module of a self-modulating multi-carrier optical fiber wireless communication system according to the present invention.
Fig. 4 is a schematic diagram of a second wireless transmission module of a self-modulating multi-carrier optical fiber wireless communication system according to the present invention.
Fig. 5 is a schematic diagram of a bit error rate test module of a self-modulating multi-carrier optical fiber wireless communication system according to the present invention.
Fig. 6 is a spectrum diagram of a millimeter wave signal after passing through an electric band-pass filter in a self-modulating multi-carrier optical fiber wireless communication system according to the present invention.
Fig. 7 is an eye diagram of a channel with a carrier of 30GHz in a self-modulating multi-carrier fiber optic wireless communication system in accordance with the present invention.
Fig. 8 is an eye diagram of a channel with a carrier of 35GHz in a self-modulating multi-carrier fiber optic wireless communication system in accordance with the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear and clear, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 to 8, fig. 1 is a flowchart of a self-modulating multi-carrier optical fiber wireless communication method according to the present invention; fig. 2 is a schematic diagram of a self-modulating multi-carrier wireless communication system in accordance with the present invention; fig. 3 is a schematic diagram of a first wireless transmission module of a self-modulating multi-carrier optical fiber wireless communication system according to the present invention; fig. 4 is a schematic diagram of a second wireless transmission module of a self-modulating multi-carrier optical fiber wireless communication system according to the present invention; FIG. 5 is a schematic diagram of a bit error rate test module of a self-modulating multi-carrier optical fiber wireless communication system according to the present invention; fig. 6 is a spectrum diagram of a millimeter wave signal after passing through an electric band-pass filter in the self-modulating multi-carrier optical fiber wireless communication system according to the present invention; FIG. 7 is an eye diagram of a channel with a carrier of 30GHz in a self-modulating multi-carrier fiber optic wireless communication system in accordance with the present invention; fig. 8 is an eye diagram of a channel with a carrier of 35GHz in a self-modulating multi-carrier fiber optic wireless communication system in accordance with the present invention.
As shown in fig. 1, a self-modulating multi-carrier optical fiber wireless communication method includes the following steps:
S1, acquiring a plurality of binary digital baseband signals which are different from each other and a plurality of sinusoidal carrier signals which are different from each other, wherein one binary digital baseband signal corresponds to one sinusoidal carrier signal; specifically, binary digital baseband signals are generated by a pseudo-random sequence;
S2, mixing the binary digital baseband signals and the sinusoidal carrier signals which correspond to each other to obtain multi-path single carrier signals;
s3, carrying out power synthesis on the multipath single carrier signals to obtain multicarrier signals;
S4, modulating the multi-carrier signal onto an optical carrier to obtain an optical millimeter wave signal;
S5, beating the millimeter wave signal to obtain a millimeter wave signal;
S6, power amplification is carried out according to millimeter wave signals, and wireless transmission or bit error rate testing is carried out.
Specifically, in the step S4, the millimeter wave signal is a millimeter wave signal containing frequency components and optical carrier components of each order, and the step S4 further includes filtering the millimeter wave signal containing frequency components and optical carrier components of each order to obtain a millimeter wave signal containing only the frequency components and optical carrier components of the positive first order.
In the step S5, the beat frequency of the millimeter wave signal is specifically: and obtaining the millimeter wave signal with the frequency of the frequency difference according to the frequency difference between the millimeter wave signal with the optical carrier wave of the positive first-order frequency component and the millimeter wave signal with the optical carrier wave component.
As shown in fig. 2, correspondingly, in a self-modulating multi-carrier optical fiber wireless communication system, the method includes:
a plurality of binary digital baseband signal sources 11 for generating a plurality of binary digital baseband signals different from each other;
a plurality of central station end sine carrier signal sources 12 for generating a plurality of mutually different sine carrier signals, wherein one binary digital baseband signal corresponds to one sine carrier signal;
A plurality of central station side mixers 13 for mixing the binary digital baseband signals and the sinusoidal carrier signals corresponding to each other to obtain multi-path single carrier signals;
a power combiner 14 for power combining the multiple single carrier signals to obtain multiple carrier signals;
a semiconductor laser 15 for modulating the multi-carrier signal onto an optical carrier to obtain an optical millimeter wave signal;
And a photodetector 21 for beating the millimeter wave signal to obtain a millimeter wave signal.
Specifically, the millimeter wave optical carrier signal obtained by the semiconductor laser 15 is a millimeter wave optical carrier signal containing frequency components and optical carrier components of each order;
the system further comprises an optical band-pass filter 16, wherein the optical band-pass filter 16 is used for filtering an optical millimeter wave signal containing each order of frequency component and optical carrier component to obtain an optical millimeter wave signal only containing a positive first order of frequency component and optical carrier component;
The beat frequency of the millimeter wave signal of the photoelectric detector 21 is specifically as follows: and obtaining the millimeter wave signal with the frequency of the frequency difference according to the frequency difference between the millimeter wave signal with the optical carrier wave of the positive first-order frequency component and the millimeter wave signal with the optical carrier wave component.
The working parameters of the binary digital baseband signal sources 11 are different, and the working parameters of the positive chord carrier signal sources 12 at the end of the central station are different, so as to obtain different signals after multipath mixing, and finally obtain a multi-carrier signal.
It should be noted that a sinusoidal carrier signal is a carrier signal that does not carry a signal, and a binary digital baseband signal is information. After mixing the binary digital baseband signal and the sinusoidal carrier signal which correspond to each other, a multi-path single carrier signal carrying information is obtained, and power synthesis is carried out on the multi-path single carrier signal, so that a multi-carrier signal carrying information is obtained. Modulating the multi-carrier signal onto an optical carrier to obtain an optical millimeter wave signal carrying information, and beating the optical millimeter wave signal to obtain the millimeter wave signal carrying information.
Modulating the multi-carrier signal onto the optical carrier to obtain the optical millimeter wave signal, thereby realizing self-modulation, having the advantage of low realization complexity and reducing realization cost; meanwhile, a plurality of binary digital baseband signals and sinusoidal carrier signals which correspond to each other are mixed, then a multi-carrier signal is obtained after power synthesis, and the multi-channel signals are transmitted simultaneously in a multi-carrier mode, so that the communication capacity is enlarged, the communication data volume is improved, and the communication efficiency is optimized.
Specifically, wireless transmission according to millimeter wave signals can be classified into a first wireless transmission mode and a second wireless transmission mode.
The first wireless transmission mode specifically includes the following steps:
Performing band-pass filtering on the millimeter wave signals obtained by beat frequency to obtain multi-carrier signals after band-pass filtering;
amplifying power of the multi-carrier signal;
And transmitting the multicarrier signals with amplified power.
Correspondingly, a self-modulating multi-carrier optical fiber wireless communication system further comprises a first wireless transmission module 22, as shown in fig. 3, the first wireless transmission module 22 comprises:
An electric band-pass filter 25 for band-pass filtering the millimeter wave signal obtained from the beat frequency to obtain a band-pass filtered multicarrier signal;
A power amplifier 26 for power amplifying the multi-carrier signal;
and an antenna for transmitting the power-amplified multicarrier signal.
On one hand, interference signals are introduced in the beat frequency process, millimeter wave signals obtained by filtering the beat frequency can be effectively removed, and only multi-carrier signals are reserved; on the other hand, the multi-carrier signal is directly amplified in power and then transmitted, the terminal can receive the multi-carrier signal, and different terminals can demodulate the multi-carrier signal according to actual conditions.
The second wireless transmission mode specifically includes the following steps:
Performing power distribution on millimeter wave signals obtained by beat frequency to obtain multiple paths of same multi-carrier signals;
Respectively carrying out band-pass filtering treatment on the same multi-carrier signals in each path to obtain multi-path single-carrier signals with different center frequencies;
Amplifying the power of each single carrier signal;
transmitting each single carrier signal after power amplification.
Correspondingly, a self-modulating multi-carrier optical fiber wireless communication system further comprises a second wireless transmission module 23, as shown in fig. 4, the second wireless transmission module 23 comprises:
a power divider 27 for dividing the millimeter wave signal obtained by beat frequency into multiple paths of same multi-carrier signals;
a plurality of electric band-pass filters 25 for respectively carrying out band-pass filtering processing on the same multi-carrier signals in each path to obtain multi-path single-carrier signals with different center frequencies;
A plurality of power amplifiers 26 for power amplifying the respective single carrier signals;
and a plurality of antennas for transmitting the single carrier signals after power amplification.
Wherein the operating parameters of the plurality of electrical bandpass filters 25 are different from each other to obtain a single carrier signal with different center frequencies of the plurality of channels.
Different from directly amplifying the power of the multi-carrier signals and then transmitting the multi-carrier signals, the multi-carrier signals with the same paths are respectively subjected to band-pass filtering treatment to obtain multi-path single-carrier signals, and then each single-carrier signal is subjected to power amplification and then transmitted, so that the multi-carrier signal can be demodulated at the base station 2 according to the actual condition of the terminal, and the load of the terminal is lightened.
In addition, the error rate test according to the millimeter wave signal specifically comprises the following steps:
Performing band-pass filtering on the millimeter wave signals obtained by beat frequency to obtain multi-carrier signals after band-pass filtering;
performing power distribution on the filtered multi-carrier signals to obtain multiple paths of same multi-carrier signals;
acquiring sine carrier signals which are different from the multiple paths;
Mixing each path of multi-carrier signal with a sinusoidal carrier signal corresponding to each path of multi-carrier signal, and moving a frequency spectrum component corresponding to each path of multi-carrier signal to a low frequency domain to obtain multi-path mixed multi-carrier signals;
respectively carrying out low-pass filtering processing on each path of mixed multi-carrier signal to obtain a plurality of binary digital baseband signals;
and performing error rate test according to the plurality of binary digital baseband signals.
Correspondingly, a self-modulating multi-carrier optical fiber wireless communication system further comprises an error rate testing module 24, as shown in fig. 5, the error rate testing module 24 comprises:
An electric band-pass filter 25 for band-pass filtering the millimeter wave signal obtained from the beat frequency to obtain a band-pass filtered multicarrier signal;
A power divider 27 for dividing the power of the filtered multi-carrier signal to obtain multiple identical multi-carrier signals;
A plurality of base station end sine carrier signal sources 28 for generating a plurality of mutually different sine carrier signals;
A plurality of base station side mixers 29 for mixing each of the multi-carrier signals with a sinusoidal carrier signal corresponding to each of the multi-carrier signals, respectively, and shifting spectral components corresponding to each of the multi-carrier signals to a low frequency domain to obtain multi-mixed multi-carrier signals;
A plurality of electric low-pass filters 30 for respectively performing low-pass filtering processing on the mixed multi-carrier signals to demodulate a plurality of binary digital baseband signals different from each other;
And a plurality of bit error rate testers 31 for performing bit error rate testing according to the demodulated binary digital baseband signals.
Wherein the operating parameters of the plurality of base station side sinusoidal carrier signal sources 28 are different from each other, and the operating parameters of the plurality of base station side mixers 29 are different from each other, so as to obtain mutually different multicarrier signals, and further obtain a plurality of mutually different binary digital baseband signals. The mixed multi-carrier signal is restored to binary digital baseband signal, and then bit error rate test is carried out, so that the communication quality can be conveniently evaluated.
The following describes the present technical solution in detail in connection with the functions and working principles of each component.
A self-modulating multi-carrier optical fiber wireless communication system comprises a central station 1 and a base station 2.
In the central station 1, binary digital baseband signals generated by a plurality of pseudo-random sequences are mixed with a plurality of different sine carrier signals respectively, then the power of the multipath single carrier signals is synthesized, and the power synthesized signals are used for driving the semiconductor laser 15, so that the multipath millimeter wave signals are loaded on the optical carrier simultaneously. The semiconductor laser 15 will generate a millimeter wave optical carrier signal with double sidebands, that is, the millimeter wave optical carrier signal containing the frequency components and the optical carrier component of each order is input to the semiconductor laser 15. After the millimeter wave signal of the optical carrier input by the semiconductor laser 15 is filtered by an optical band pass filter 16, the millimeter wave signal of the optical carrier only containing the positive first-order frequency component and the optical carrier component remains. The filtered millimeter wave optical carrier signal will be transmitted to the base station 2 via an optical fiber link.
In the base station 2, the received millimeter wave is beaten by the photodetector 21, and the millimeter wave signal is converted into a millimeter wave signal. The base station 2 comprises a first wireless transmission module 22, a second wireless transmission module 23 and a bit error rate test module 24.
The central station 1 comprises:
a plurality of binary digital baseband signal sources 11 for generating a plurality of binary digital baseband signals;
a plurality of central station end sine carrier signal sources 12 for generating a plurality of sine carrier signals;
A plurality of central station side mixers 13 for mixing the binary digital baseband signals and the sinusoidal carrier signals corresponding to each other;
a power combiner 14 for power combining the multiple single carrier signals;
a semiconductor laser 15 for modulating the multi-carrier signal onto an optical carrier to obtain an optical millimeter wave signal;
An optical bandpass filter 16 for filtering the millimeter wave signal of the optical carrier having each order of frequency component and optical carrier component to obtain the millimeter wave signal of the optical carrier having only the positive first order of frequency component and optical carrier component.
Specifically, the semiconductor laser further comprises a laser internal working power supply, wherein the input end of the laser internal working power supply is connected with the output end of the power synthesizer, and the output end of the laser internal working power supply is connected with the input end of the semiconductor laser.
Modulating the multi-carrier signal onto an optical carrier to obtain an optical millimeter wave signal specifically comprises: the power of the output laser is controlled according to the current amplitude of the multi-carrier signal.
The power synthesizer outputs a multi-carrier signal which is an electric signal, and the laser internal working power supply controls and outputs the power of laser according to the current amplitude of the multi-carrier signal, so that the self-modulation function is realized.
The central station 1 operates as follows: the multiple binary digital baseband signals are mixed with different sinusoidal carrier signals by a plurality of hub-side mixers 13. After mixing, the multiple signals are summed by a power combiner 14. The added signals are input to one semiconductor laser 15, and the semiconductor laser 15 performs self-modulation and outputs an optical millimeter wave signal containing a plurality of carriers. After the signal passes through the optical band pass filter 16, the optical millimeter wave signal containing the frequency component and the optical carrier component of each order is subjected to filtering processing, so that the optical millimeter wave signal containing only the frequency component and the optical carrier component of the positive first order is obtained, and the optical millimeter wave signal is transmitted to the base station 2 through the optical fiber link. Communication is achieved between the central station 1 and the base station 2 via an optical fiber link, i.e. the output of the optical band-pass filter 16 is connected to the input of the photodetector 21 via an optical fiber link.
The base station 2 firstly beats the millimeter wave signal through the photoelectric detector 21 to obtain the millimeter wave signal, and then wirelessly transmits the millimeter wave signal through the first wireless transmission module 22 or the second wireless transmission module 23, or performs error rate test on the millimeter wave signal through the error rate tester 31.
The first wireless transmission module 22 includes:
An electric band-pass filter 25 for band-pass filtering the millimeter wave signal obtained from the beat frequency to obtain a band-pass filtered multicarrier signal;
A power amplifier 26 for power amplifying the multi-carrier signal;
and an antenna for transmitting the power-amplified multicarrier signal.
The second wireless transmission module 23 includes:
a power divider 27 for dividing the millimeter wave signal obtained by beat frequency into multiple paths of same multi-carrier signals;
a plurality of electric band-pass filters 25 for respectively carrying out band-pass filtering processing on the same multi-carrier signals in each path to obtain multi-path single-carrier signals with different center frequencies;
A plurality of power amplifiers 26 for power amplifying the respective single carrier signals;
and a plurality of antennas for transmitting the single carrier signals after power amplification.
The bit error rate test module 24 includes:
An electric band-pass filter 25 for band-pass filtering the millimeter wave signal obtained from the beat frequency to obtain a band-pass filtered multicarrier signal;
A plurality of power dividers 27 for dividing the power of the filtered multi-carrier signals to obtain multiple identical multi-carrier signals;
A plurality of base station end sine carrier signal sources 28 for generating a plurality of mutually different sine carrier signals;
A plurality of base station side mixers 29 for mixing each of the multi-carrier signals with a sinusoidal carrier signal corresponding to each of the multi-carrier signals, respectively, and shifting spectral components corresponding to each of the multi-carrier signals to a low frequency domain to obtain multi-mixed multi-carrier signals;
A plurality of electric low-pass filters 30 for respectively performing low-pass filtering processing on the mixed multi-carrier signals to demodulate a plurality of binary digital baseband signals;
And a plurality of bit error rate testers 31 for performing bit error rate testing according to the demodulated binary digital baseband signals.
It should be noted that only one of the first wireless transmission module 22, the second wireless transmission module 23 and the bit error rate test module 24 may be disposed in the base station 2, or any two or three of these three modules may be disposed, so as to satisfy different application scenarios.
The present technical scheme will be described by examples.
A plurality of binary digital baseband signal sources 11, generating N binary digital baseband signals from a pseudo-random sequence. In the present embodiment, two binary digital baseband signal sources 11 are provided, and the bit rate of both binary digital baseband signal sources 11 is 2.5GHz. Of course, the two binary digital baseband signal sources 11 may also be of higher bit rate.
A plurality of central station end sinusoidal carrier signal sources 12 produce a plurality of different sinusoidal carrier signals. In this embodiment, the number of the center station end sine carrier signal sources 12 is two, and the frequencies are 30GHz and 35GHz respectively. Of course, higher or lower frequencies are also possible.
And a plurality of central station side mixers 13 for mixing the binary digital baseband signals of each path with the corresponding sine carrier signals. In the present embodiment, the center station side mixer 13 is provided with two.
And a power combiner 14 for adding the mixed signals to output a signal containing a plurality of carriers. In this embodiment, the power combiner 14 is two-way input and one-way output.
And the semiconductor laser 15 is used for modulating the multi-carrier signal onto an optical carrier to obtain an optical millimeter wave signal. In the present embodiment, the optical carrier center frequency of the semiconductor laser 15 is 193.1THz.
An optical bandpass filter 16 for filtering the signal generated by the semiconductor laser 15 to leave an optical millimeter wave signal of the positive first-order frequency component and the optical carrier component. In this embodiment, the optical band-pass filter 16 uses a center frequency 193.1175THz and a bandwidth 40GHz, and after passing through the optical band-pass filter 16, an optical millimeter wave signal containing an optical carrier component of 30GHz and a positive first-order frequency component of 35GHz remains.
And a photodetector 21 for performing photoelectric conversion at beat frequency to convert the received millimeter wave signal of the optical carrier into a millimeter wave signal.
And an electric band-pass filter 25 for filtering the millimeter wave signal obtained by the beat frequency to leave a millimeter wave signal containing only the carrier wave. In this embodiment, the center frequency of the electric band-pass filter 25 is 32.5GHz, the bandwidth is 10GHz, and the spectrum after passing through the electric band-pass filter 25 is shown in fig. 6, and millimeter wave signals with carriers of 30GHz and 35GHz can be seen.
A power amplifier 26 for power amplifying the multicarrier signal before transmission.
And an antenna for transmitting the multicarrier signal amplified by the power amplifier 26.
And a power divider 27 for dividing the millimeter wave signal into multiple identical signal outputs. In this embodiment, the power divider 27 is one-way input and two-way output.
The base station end sine carrier signal source 28 is used for generating a plurality of different sine carrier signals for demodulation, and the frequencies of the sine carrier signals are in one-to-one correspondence with and the same as those of the plurality of central station end sine carrier signal sources 12. In this embodiment, the base station end sine carrier signal sources 28 are two, and the frequencies are 30GHz and 35GHz respectively, or may be higher frequencies corresponding to the sine carrier signal sources of the central station 1.
The base station mixer 29 is configured to mix the millimeter wave signal after photoelectric conversion with a corresponding sinusoidal carrier signal, and to down-convert the millimeter wave signal and output the millimeter wave signal. In the present embodiment, the base station side mixer 29 is provided with two.
A plurality of electrical low pass filters 30 for filtering the mixed signal to leave only binary digital baseband signals, i.e. the signals can be demodulated after passing through the electrical low pass filters 30. In the present embodiment, i.e. the electrical low-pass filter 30 is provided with two, its cut-off frequency is 2.5GHz.
The bit error rate tester 31 is used for analyzing the bit error rate of each path of recovered binary digital baseband signal, thereby checking the system performance. In this embodiment, the bit error rate tester 31 is provided in two ways to test the bit error rate of two-way carrier communication with 30GHz and 35GHz carrier, respectively.
In the case that the optical fiber length between the central station 1 and the base station 2 is 50km, the result of the bit error rate tester 31 shows that the bit error rate of two signals of different carriers is about 10 to the power of-28, and the eye diagrams of two signals of 30GHz and 35GHz are shown in fig. 7 and 8, respectively. The performance of the whole optical communication system is good as can be seen from the error rate and the eye diagram.
In summary, compared with the prior art, the invention provides a self-modulation multi-carrier optical fiber wireless communication method and system, wherein the technical scheme modulates multi-carrier signals onto optical carriers to obtain optical millimeter wave signals, thereby realizing self-modulation, having the advantages of low realization complexity and reducing realization cost; meanwhile, a plurality of binary digital baseband signals and sinusoidal carrier signals which correspond to each other are mixed, then a multi-carrier signal is obtained after power synthesis, and the multi-channel signals are transmitted simultaneously in a multi-carrier mode, so that the communication capacity is enlarged, the communication data volume is improved, and the communication efficiency is optimized.
It is to be understood that the invention is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.
Claims (2)
1. A self-modulating multi-carrier optical fiber wireless communication method is characterized in that: comprises the steps of,
S1, acquiring a plurality of binary digital baseband signals which are different from each other and a plurality of sinusoidal carrier signals which are different from each other, wherein one binary digital baseband signal corresponds to one sinusoidal carrier signal;
S2, mixing the binary digital baseband signals and the sinusoidal carrier signals which correspond to each other to obtain multi-path single carrier signals;
s3, carrying out power synthesis on the multipath single carrier signals to obtain multicarrier signals;
S4, modulating the multi-carrier signal onto an optical carrier to obtain an optical millimeter wave signal; in the step S4, the millimeter wave signal is a millimeter wave signal containing each order of frequency component and optical carrier component, and the step S4 further includes filtering the millimeter wave signal containing each order of frequency component and optical carrier component to obtain a millimeter wave signal containing only a positive first order of frequency component and optical carrier component; modulating the multi-carrier signal onto an optical carrier to obtain an optical millimeter wave signal, realizing self-modulation, reducing the realization complexity and lowering the realization cost;
S5, beating the millimeter wave signal to obtain a millimeter wave signal;
In the step S5, the beat frequency of the millimeter wave signal is specifically: obtaining millimeter wave signals with the frequency of the frequency difference according to the frequency difference between the millimeter wave signals of the optical carrier wave of the positive first-order frequency component and the millimeter wave signals of the optical carrier wave component;
performing wireless transmission according to millimeter wave signals;
the wireless transmission according to the millimeter wave signal comprises a first wireless transmission mode, wherein the first wireless transmission mode specifically comprises the following steps:
Performing band-pass filtering on the millimeter wave signals obtained by beat frequency to obtain multi-carrier signals after band-pass filtering;
amplifying power of the multi-carrier signal;
Transmitting the multicarrier signal with amplified power;
the wireless transmission according to the millimeter wave signal further comprises a second wireless transmission mode, wherein the second wireless transmission mode specifically comprises the following steps:
Performing power distribution on millimeter wave signals obtained by beat frequency to obtain multiple paths of same multi-carrier signals;
Respectively carrying out band-pass filtering treatment on the same multi-carrier signals in each path to obtain multi-path single-carrier signals with different center frequencies;
Amplifying the power of each single carrier signal;
Transmitting each single carrier signal after power amplification;
after the step S5, performing error rate test according to millimeter wave signals;
the error rate test according to the millimeter wave signal specifically comprises the following steps:
Performing band-pass filtering on the millimeter wave signals obtained by beat frequency to obtain multi-carrier signals after band-pass filtering;
Carrying out power distribution on the multi-carrier signals after band-pass filtering to obtain multiple paths of same multi-carrier signals;
Acquiring multiple paths of sine carrier signals which are different from each other;
Mixing each path of multi-carrier signal with a sinusoidal carrier signal corresponding to each path of multi-carrier signal, and moving a frequency spectrum component corresponding to each path of multi-carrier signal to a low frequency domain to obtain multi-path mixed multi-carrier signals;
respectively carrying out low-pass filtering processing on each path of mixed multi-carrier signal to obtain a plurality of binary digital baseband signals;
Performing error rate testing according to the plurality of binary digital baseband signals;
and multiple paths of signals are transmitted simultaneously in a multi-carrier mode, so that the communication capacity is enlarged, the data volume of communication is improved, and the communication efficiency is optimized.
2. A self-modulating multi-carrier optical fiber wireless communication system, characterized in that: comprising the steps of (a) a step of,
A plurality of binary digital baseband signal sources for generating a plurality of binary digital baseband signals different from each other;
a plurality of central station end sine carrier signal sources for generating a plurality of mutually different sine carrier signals, wherein one binary digital baseband signal corresponds to one sine carrier signal;
A plurality of central station side mixers for mixing the binary digital baseband signals and the sine carrier signals which correspond to each other to obtain a plurality of paths of single carrier signals;
a power synthesizer for power synthesizing the multi-path single carrier signals to obtain multi-carrier signals;
a semiconductor laser for modulating the multi-carrier signal onto an optical carrier to obtain an optical millimeter wave signal;
The millimeter wave signal is an millimeter wave signal containing frequency components and optical carrier components of each order;
The system also comprises an optical band-pass filter, wherein the optical band-pass filter is used for filtering the optical millimeter wave signals containing all the order frequency components and the optical carrier components to obtain the optical millimeter wave signals only containing the positive first order frequency components and the optical carrier components; modulating the multi-carrier signal onto an optical carrier to obtain an optical millimeter wave signal, realizing self-modulation, reducing the realization complexity and lowering the realization cost; the photoelectric detector is used for beating the millimeter wave signal, and the millimeter wave signal is obtained, and the photoelectric detector is used for beating the millimeter wave signal specifically: obtaining millimeter wave signals with the frequency of the frequency difference according to the frequency difference between the millimeter wave signals of the optical carrier wave of the positive first-order frequency component and the millimeter wave signals of the optical carrier wave component;
Also included is a first wireless transmission module, the first wireless transmission module comprising:
an electric band-pass filter for band-pass filtering the millimeter wave signal obtained from the beat frequency to obtain a multi-carrier signal after band-pass filtering;
A power amplifier for power amplifying the multi-carrier signal;
an antenna for transmitting the power-amplified multicarrier signal;
Also included is a second wireless transmission module, the second wireless transmission module comprising:
The power divider is used for carrying out power division on millimeter wave signals obtained by beat frequency to obtain multiple paths of same multi-carrier signals;
The plurality of electric band-pass filters respectively carry out band-pass filtering treatment on the same multi-carrier signals in each path to obtain multi-path single-carrier signals with different center frequencies;
A plurality of power amplifiers for power amplifying the respective single carrier signals;
A plurality of antennas for transmitting the single carrier signals amplified by the power;
the error rate test module comprises:
an electric band-pass filter for band-pass filtering the millimeter wave signal obtained from the beat frequency to obtain a multi-carrier signal after band-pass filtering;
a power divider for performing power division on the multi-carrier signals after band-pass filtering to obtain multi-path same multi-carrier signals;
a plurality of base station end sine carrier signal sources for generating a plurality of paths of sine carrier signals which are different from each other;
The base station side mixers are used for respectively mixing each path of multi-carrier signal and a sinusoidal carrier signal corresponding to each path of multi-carrier signal, and moving frequency spectrum components corresponding to each path of multi-carrier signal to a low frequency domain to obtain multi-path mixed multi-carrier signals;
The plurality of electric low-pass filters are used for respectively carrying out low-pass filtering processing on the multi-carrier signals after the frequency mixing of each path and demodulating a plurality of binary digital baseband signals;
The bit error rate tester is used for carrying out bit error rate test according to the demodulated multiple binary digital baseband signals;
and multiple paths of signals are transmitted simultaneously in a multi-carrier mode, so that the communication capacity is enlarged, the data volume of communication is improved, and the communication efficiency is optimized.
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