CN116015480B - Two-photon vector radio frequency signal generation method - Google Patents
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Abstract
The invention relates to a two-photon vector radio frequency signal generation method, and belongs to the technical field of optical carrier wireless communication systems. The invention provides two mutually independent vector radio frequency waves with different carrier frequencies, different modulation formats and different baud rates for an optical carrier wireless communication system by means of DSM technology capable of converting any real signal into a digital sequence only containing +1 and-1 and an optical I/Q modulation and homodyne coherent detection architecture capable of realizing generation and detection of baseband optical QPSK signals. The two mutually independent vector radio frequency waves can carry a very high-order QAM signal. The two paths of mutually independent vector radio frequency waves can be modulated by a single carrier or OFDM, or one path of the vector radio frequency waves can be modulated by the single carrier, and the other path of the vector radio frequency waves is modulated by OFDM. Meanwhile, the invention avoids the use of light polarization multiplexing and light polarization diversity, thereby greatly simplifying the system architecture and increasing the stability of the system.
Description
Technical Field
The invention belongs to the technical field of Radio-over-Fiber (RoF) communication systems, and particularly relates to a method and a system for simultaneously generating and detecting two-photon vector Radio frequency signals by adopting a delta-sigma modulation (DSM) technology and a classical optical I/Q modulation and homodyne coherent detection architecture.
Background
The Radio-over-Fiber (RoF) fusion system has the dual advantages of long transmission distance and high mobility, and is a necessary trend of future broadband network development. In RoF systems recently reported by numerous scientific communities, wireless multiple-input multiple-output (MIMO) technology is used to increase wireless transmission capacity to match ultra-large fiber transmission capacity. However, existing MIMO-type RoF fusion systems typically require the use of optical polarization multiplexing and optical polarization diversity to simultaneously generate multiple vector radio frequency signals for wireless MIMO transmission, which greatly increases the complexity of the system architecture. And the existing MIMO type RoF fusion system generally adopts the same carrier frequency and vector adjustment format and carries the same information, and can only adopt lower-order quadrature amplitude modulation (quadrature amplitude modulation, abbreviated as QAM), which greatly limits the flexibility and spectral efficiency of the system.
Disclosure of Invention
The invention aims to solve the problems of low frequency spectrum efficiency and small transmission capacity caused by low order in the prior art, and provides a two-photon vector radio frequency signal generation method and system; the method can be used for providing two mutually independent vector radio frequency waves with different carrier frequencies, different modulation formats and different baud rates for the RoF system very flexibly by means of DSM technology capable of converting any real signal into a digital sequence only containing +1 and-1 and optical I/Q modulation and homodyne coherent detection architecture capable of realizing generation and detection of baseband optical QPSK signals. The two mutually independent vector radio frequency waves may carry very high order QAM signals, such as 256QAM or even higher. The two paths of mutually independent vector radio frequency waves can be modulated by a single carrier or OFDM, or one path of the vector radio frequency waves can be modulated by the single carrier, and the other path of the vector radio frequency waves is modulated by OFDM. Meanwhile, the invention avoids the use of light polarization multiplexing and light polarization diversity, thereby greatly simplifying the system architecture and increasing the stability of the system.
The aim of the invention is achieved by the following technical scheme;
a double-vector radio frequency signal generation method comprises the following steps:
step one, generating two mutually independent digital vector baseband signals by utilizing digital signal processings1Ands2the method comprises the steps of carrying out a first treatment on the surface of the Then a digital sequence is obtained via an up-conversion process and a digital bandpass DSMs1 * Ands2 * ；
binding frequency
Digital local oscillator source and digital mixer for converting digital vector baseband signalss1Performing up-conversion to obtain carrier frequency +.>
Digital vector radio frequency signals of (a); then via the center frequency +.>
Is converted into a digital sequence containing only +1 and-1s1 * The method comprises the steps of carrying out a first treatment on the surface of the At the same time, the binding frequency is +.>
Digital local oscillator source and digital mixer for converting digital vector baseband signalss2Performing up-conversion to obtain carrier frequency +.>
Digital vector radio frequency signals of (a); then via the center frequency +.>
Is converted into a digital sequence containing only +1 and-1s2 * ；/>
Step two, digital sequences with the same rates1 * Ands2 * an in-phase (abbreviated as I) and quadrature-phase (abbreviated as Q) input port fed to the same digital-to-analog converter, respectively; the I and Q outputs of the D/A converter are amplified by a driving amplifier and used for driving an optical I/Q modulator to modulate the working frequency from a single-mode laser
The optical carrier of continuous wavelength of (2) is used for realizing baseband optical QPSK modulation and obtaining equivalent baseband optical QPSK signals;
the equivalent baseband optical QPSK signal simultaneously comprises two optical frequency waves, wherein one of the optical frequency waves is carrier frequency
Is carried with vector signalss1Is a light frequency wave of (a); the other is the carrier frequency +.>
Is carried with vector signalss2Is a light frequency wave of (a);
the equivalent baseband optical QPSK signal generated in the third step is amplified by an erbium-doped optical fiber amplifier and transmitted in a single-mode optical fiber with the length of L and then is sent into a homodyne coherent receiver, and the working frequency of an optical source adopted by the homodyne coherent receiver is that
The operating frequency->
And the operating frequency->
The same;
i-path sum detected by homodyne coherent receiverAfter the Q-channel electric signal is processed by the analog-to-digital converter, the digital sequence transmitted by the QPSK recovery and demodulation algorithm is recovereds1 * Ands2 * ；
recovered digital sequences1 * Via a center frequency of
After filtering by a band-pass filter, recovering the original vector signal therefroms1The method comprises the steps of carrying out a first treatment on the surface of the Similarly, the recovered digital sequences2 * Via a center frequency of +.>
Can recover the original vector signal from the band-pass filter of the filters2。
The length L calculating method comprises the following steps:
where L is the fiber transmission length,
is the working frequency of a single-mode laser, c is the propagation speed of light in vacuum, B is the baud rate of an equivalent baseband light QPSK signal, D is the fiber dispersion coefficient, < >>
Is the absolute value of the difference between the carrier frequencies of the dual vector radio frequency signals.
In the present invention, two independent digital vector baseband signals may have the same or different baud rates and employ the same or different vector modulation formats including quadrature phase shift keying (quadrature phase shift keying, abbreviated as QPSK), 8 th order quadrature amplitude modulation (8-ary quadrature amplitude modulation, abbreviated as 8 QAM), 16 th order quadrature amplitude modulation (16-ary quadrature amplitude modulation, abbreviated as 16 QAM), 64 th order quadrature amplitude modulation (64-ary quadrature amplitude modulation, abbreviated as 64 QAM), 128 th order quadrature amplitude modulation (128-ary quadrature amplitude modulation, abbreviated as 128 QAM), and the like.
In the present invention, the two independent digital vector baseband signals may employ a very high order QAM modulation format, such as 256-order quadrature amplitude modulation (256-ary quadrature amplitude modulation, abbreviated 256 QAM), 512-order quadrature amplitude modulation (512-ary quadrature amplitude modulation, abbreviated 512 QAM) or even higher.
In the invention, two independent digital vector baseband signals can be modulated by single carrier or OFDM, one path can be modulated by single carrier, and the other path can be modulated by OFDM.
In the present invention,
and->
May be equal or unequal.
The invention also provides a system for realizing the simultaneous generation and detection of the double-vector radio frequency signals by adopting the DSM technology and a classical optical I/Q modulation and homodyne coherent detection architecture, which comprises the following components:
two digital vector baseband signal generation modules for generating two independent digital vector baseband signalss1Ands2the two digital vector baseband signals can have the same or different baud rates and adopt the same or different vector modulation formats, including QPSK, 8QAM, 16QAM, 64QAM, 128QAM or even very high-order QAM and the like, and can be modulated by single carrier or OFDM, one path of the two digital vector baseband signals can also be modulated by single carrier, and the other path of the two digital vector baseband signals can be modulated by OFDM;
two groups of digital local oscillation sources and digital mixers, wherein one group of frequencies is
For combining digital vector baseband signals with digital local vibration sources and corresponding digital mixerss1Up-conversion to carrier frequency +.>
Another group of frequencies are +.>
For combining digital vector baseband signals with digital local vibration sources and corresponding digital mixerss2Up-conversion to carrier frequency
Digital vector radio frequency signal, ">
And->
Can be equal or unequal；
Two digital bandpass DSM modules with center frequency of
The digital band pass DSM module of (C) will have a carrier frequency of +.>
Is converted into a digital sequence containing only +1 and-1s1 * The center frequency is +.>
The digital band pass DSM module of (C) will have a carrier frequency of +.>
Is converted into a digital sequence containing only +1 and-1s2 * Digital sequences1 * Ands2 * having the same rate；
Digital-to-analog converter for implementing digital sequences with the same rates1 * Ands2 * conversion from the digital domain to the analog domain, providing I and Q drive inputs for the I/Q modulator;
two electric amplifiers for amplifying the driving inputs of I and Q paths of the I/Q modulator, respectively;
single mode laser for providing I/Q modulator with operating frequency
Is a continuous wavelength optical carrier input;
an I/Q modulator for performing baseband optical QPSK modulation to generate an equivalent baseband optical QPSK signal, which includes carrier frequencies at the same time
Is carried with vector signalss1The optical frequency wave and carrier frequency of (a) are
Is carried with vector signalss2Is a light frequency wave of (a);
the erbium-doped optical fiber amplifier is used for amplifying the generated equivalent baseband optical QPSK signal;
a single mode fiber for transmitting the generated equivalent baseband optical QPSK signal;
homodyne coherent receiver and operating frequency of
The optical source is used for performing homodyne detection on the received equivalent baseband optical QPSK signal, and the detected I-path and Q-path electric signals are sent into a two-path analog-to-digital converter;
the analog-to-digital converter is used for converting the I-path and Q-path electric signals obtained through homodyne detection from an analog domain to a digital domain;
a digital QPSK recovery and demodulation module for recovering the transmitted digital sequence from the I and Q signals obtained by homodyne detections1 * Ands2 * ；
two digital band pass filters, one with a center frequency of
For recovering a digital sequence from a recovered digital sequences1 * Filtering the raw materialsInitial vector signals1The other center frequency is +.>
For recovering a digital sequence from a recovered digital sequences2 * Filtering the original vector signals2；
And the two digital vector baseband signal demodulation modules are used for recovering the original transmitted bit stream.
Compared with the prior art, the invention has the beneficial effects that:
the invention can realize the simultaneous generation and detection of two independent vector radio frequency signals by adopting DSM technology and classical optical I/Q modulation and homodyne coherent detection architecture.
The invention makes the classical hardware architecture, namely the optical I/Q modulation and homodyne coherent detection architecture, have new functions, namely the functions of simultaneously generating and detecting two independent vector radio frequency signals by means of DSM technology capable of converting any real signal into a digital sequence only containing +1 and-1 and a mode of combining software and hardware.
The two-way vector radio frequency signal generated in the present invention can achieve very high order QAM modulation, such as 256QAM or higher, by means of DSM technology.
The two paths of vector radio frequency signals generated in the invention can have different carrier frequencies, different QAM modulation formats and different baud rates.
The two paths of vector radio frequency signals generated in the invention can both adopt a single carrier mode or an OFDM mode, or one path of single carrier and the other path of OFDM.
The above-described 1-5 features of the present invention allow for a very flexible system.
The invention avoids the use of optical polarization multiplexing and optical polarization diversity, thereby greatly simplifying the system architecture and increasing the stability of the system.
Drawings
Fig. 1 is a schematic diagram of a system for implementing simultaneous generation and detection of dual-vector radio frequency signals using DSM technology and a classical optical I/Q modulation and homodyne coherent detection architecture according to the present invention.
Reference numerals in the drawings: 1-a first digital vector baseband signal generation module; 2-a second digital vector baseband signal generation module; 3-frequency of
Digital primary vibration source of (a); 4-frequency is->
Digital primary vibration source of (a); 5-a first digital mixer; 6-a second digital mixer; 7-center frequency is +.>
Digital bandpass DSM module of (a); 8-center frequency +.>
Digital bandpass DSM module of (a); a 9-D/A converter; 10-a first electrical amplifier; 11-a second electrical amplifier; a 12-I/Q modulator; 13-single mode laser; 14-erbium-doped fiber amplifier; 15-single mode optical fiber; a 16-homodyne coherent receiver; 17-a light source; an 18-analog-to-digital converter; a 19-digital QPSK recovery and demodulation module; 20-center frequency is +.>
Is a bandpass filter of (2); 21-center frequency is +.>
Is a bandpass filter of (2); 22-a first digital vector baseband signal demodulation module; 23-a second digital vector baseband signal demodulation module.
Fig. 2 is a 24GHz signal spectrum before and after DSM in a specific example of implementation.
Fig. 3 shows the 28GHz signal spectrum before and after DSM in a specific example of implementation.
Fig. 4 is an output spectrum of an I/Q modulator in a specific example implementation.
Fig. 5 is a 24GHz signal spectrum after the DSM received in a specific embodiment, and the inset in fig. 5 is a 16QAM constellation recovered in a specific embodiment.
Fig. 6 is a 28GHz signal spectrum after a DSM has received in a specific example of implementation. The inset in fig. 5 is a recovered 256QAM constellation in a specific example implementation.
Description of the embodiments
The invention will be described in further detail with reference to the accompanying drawings, in conjunction with specific examples.
Fig. 1 is a schematic diagram of a system for implementing simultaneous generation and detection of dual vector radio frequency signals using DSM technology and a classical optical I/Q modulation and homodyne coherent detection architecture, comprising:
the first digital vector baseband signal generation module 1 is used for generating digital vector baseband signalss1. Then by means of frequency
Digital local oscillation source 3 and digital mixer 5, digital vector baseband signals1Is up-converted to a carrier frequency +.>
Is a digital vector radio frequency signal of (a). Then, the carrier frequency is +.>
Is via the centre frequency +.>
Is converted into a digital sequence containing only +1 and-1s1 * 。
Meanwhile, the second digital vector baseband signal generating module 2 is configured to generate a digital vector baseband signals2. Then by means of frequency
Digital local oscillation source 4 and digital mixer 6, digital vector baseband signals2Is up-converted to a carrier frequency +.>
Is a digital vector radio frequency signal of (a). Then, the carrier frequency is +.>
Is via the centre frequency +.>
Is converted into a digital sequence containing only +1 and-1 by the digital bandpass DSM module 8s2 * 。
In the specific example of implementation of this method,s1is a single carrier 16QAM signal of 8Gb/s (2 Gbaud),
equal to 24GHz;s2is a single carrier 256QAM signal of 8Gb/s (1 Gbaud), is +.>
Equal to 28GHz. The center frequency is +.>
Digital bandpass DSM module 7 and center frequency of +.>
The oversampling rate of the digital bandpass DSM block 8 is set to 32 and 64, respectively。Digital sequences1 * Ands2 * with the same rate 128Gb/s. Fig. 2 is a 24GHz signal spectrum before and after DSM in a specific example of implementation. Fig. 3 shows the 28GHz signal spectrum before and after DSM in a specific example of implementation.
Then, a two-way digital-to-analog converter 9 is used to implement the digital sequence with the same rates1 * Ands2 * conversion from the digital domain to the analog domain provides I and Q drive inputs to I/Q modulator 12. The first and second electrical amplifiers 10 and 11 are used to amplify the drive inputs of the I and Q paths of the I/Q modulator 12, respectively. In a specific example, the sampling rate of the digital-to-analog converter is set to 128GSa/s.
Then, a single mode laser 13 is used to provide the I/Q modulator 12 with an operating frequency of
Is a continuous wavelength optical carrier input. The I/Q modulator 12 is configured to implement baseband optical QPSK modulation to generate an equivalent baseband optical QPSK signal, which includes carrier frequencies +.>
Is carried with vector signalss1The optical frequency wave and carrier frequency of (a) are
Is carried with vector signalss2Is a radio frequency wave of the light source. In a specific embodiment, the ∈ ->
Equal to 193.1THz。Fig. 4 is an output spectrum of an I/Q modulator in a specific example implementation.
Then the generated equivalent baseband optical QPSK signal is amplified by the erbium-doped fiber amplifier 14, then is sent into a single-mode fiber 15 with a certain length for transmission, and then is sent into a homodyne coherent receiver 16, wherein the working frequency of an optical local oscillator source 17 adopted by the homodyne coherent receiver is
。
The I and Q electrical signals detected by the homodyne coherent receiver 16 are then processed by an analog-to-digital converter 18 and further fed into a digital QPSK recovery and demodulation module 19 to recover the transmitted digital sequences1 * Ands2 * . Fig. 5 is a frequency spectrum of a 24GHz signal after a DSM has been received in a specific example of implementation. Fig. 6 is a 28GHz signal spectrum after a DSM has received in a specific example of implementation.
Finally, the recovered digital sequences1 * Via a center frequency of
After filtering by the band-pass filter 20, the original vector signal can be recovered therefroms1Recovered vector signals1Can be recovered after processing by the first digital vector baseband signal demodulation module 22The original bit stream is copied out.
At the same time, the recovered digital sequences2 * Via a center frequency of
After filtering by the band-pass filter 21, the original vector signal can be recovered therefroms2Recovered vector signals2The original bit stream can be restored after processing via the second digital vector baseband signal demodulation module 23.
The inset in fig. 5 is a recovered 16QAM constellation in a specific example implementation. The inset in fig. 6 is a recovered 256QAM constellation in a specific example implementation.
In a word, the method and the system adopting DSM technology and classical optical I/Q modulation and homodyne coherent detection architecture can realize the generation and detection of two independent vector radio frequency signals with different carrier frequencies, different modulation formats and different baud rates, thereby enhancing the flexibility of the system; the use of optical polarization multiplexing and optical polarization diversity is avoided, thereby greatly simplifying the system architecture and increasing the stability of the system. The method and the system for realizing the simultaneous generation and detection of the double-vector radio frequency signals by adopting the DSM technology and the classical optical I/Q modulation and homodyne coherent detection architecture are suitable for MIMO type optical carrier wireless communication with different modulation formats, different baud rates and different carrier frequency multiplexing.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (5)
1. A two-photon vector radio frequency signal generation method is characterized in that: the method comprises the following steps:
step one, generating two by digital signal processingIndependent digital vector baseband signalss1Ands2the method comprises the steps of carrying out a first treatment on the surface of the Then a digital sequence is obtained via an up-conversion process and a digital bandpass DSMs1 * Ands2 * ；
binding frequency
Digital local oscillator source and digital mixer for converting digital vector baseband signalss1Performing up-conversion to obtain carrier frequency +.>
Digital vector radio frequency signals of (a); then via the center frequency +.>
Is converted into a digital sequence containing only +1 and-1s1 * The method comprises the steps of carrying out a first treatment on the surface of the At the same time, the binding frequency is +.>
Digital local oscillator source and digital mixer for converting digital vector baseband signalss2Performing up-conversion to obtain carrier frequency +.>
Digital vector radio frequency signals of (a); then via the center frequency +.>
Is converted into a digital sequence containing only +1 and-1s2 * ；
Step two, digital sequences with the same rates1 * Ands2 * in-phase I and quadrature-phase Q input ports respectively fed to the same digital-to-analog converter; the in-phase I and quadrature-phase Q outputs of the D/A converter are amplified by a drive amplifier and used for driving an optical I/Q modulator to modulate the working frequency from a single-mode laser to
The optical carrier of continuous wavelength of (2) is used for realizing baseband optical QPSK modulation and obtaining equivalent baseband optical QPSK signals;
the equivalent baseband optical QPSK signal simultaneously comprises two optical frequency waves, wherein one of the optical frequency waves is carrier frequency
Is carried with vector signalss1Is a light frequency wave of (a); the other is the carrier frequency +.>
Is carried with vector signalss2Is a light frequency wave of (a); generating a two-photon vector radio frequency signal;
step three, the generated equivalent baseband optical QPSK signal is amplified by an erbium-doped fiber amplifier and transmitted in a single-mode fiber with the length of L, and then is sent into a homodyne coherent receiver; the working frequency of the light source vibration source adopted by the homodyne coherent receiver is
Frequency of operation->
And the operating frequency->
The same;
and step four, after the I-path and Q-path electric signals detected by the homodyne coherent receiver are processed by the analog-to-digital converter, restoring the transmitted digital sequence by using QPSK restoring and demodulating algorithms1 * Ands2 * ；
recovered digital sequences1 * Via a center frequency of
After filtering by a band-pass filter, recovering the original vector signal therefroms1The method comprises the steps of carrying out a first treatment on the surface of the Similarly, the recovered digital sequences2 * Via a center frequency of +.>
After filtering by a band-pass filter, recovering the original vector signal therefroms2。
2. The two-photon vector radio frequency signal generating method according to claim 1, wherein:
the length L calculating method comprises the following steps:
where L is the fiber transmission length,
is the working frequency of a single-mode laser, c is the propagation speed of light in vacuum, B is the baud rate of an equivalent baseband light QPSK signal, D is the fiber dispersion coefficient, < >>
Is the absolute value of the difference between the carrier frequencies of the dual vector radio frequency signals.
3. The two-photon vector radio frequency signal generating method according to claim 1, wherein: the two mutually independent digital vector baseband signals have the same or different baud rates and adopt the same or different vector modulation formats; the modulation formats include quadrature phase shift keying, 8-order quadrature amplitude modulation, 16-order quadrature amplitude modulation, 64-order quadrature amplitude modulation, 128-order quadrature amplitude modulation, 256-order quadrature amplitude modulation, 512-order quadrature amplitude modulation.
4. The two-photon vector radio frequency signal generating method according to claim 1, wherein:
the two independent digital vector baseband signals are modulated by single carrier or OFDM;
or one path of the two independent digital vector baseband signals adopts single carrier modulation, and the other path adopts OFDM modulation.
5. The apparatus for implementing a two-photon vector radio frequency signal generating method according to claim 1, wherein: comprising the following steps:
two digital vector baseband signal generation modules for generating two independent digital vector baseband signalss1Ands2；
two groups of digital local oscillation sources and digital mixers, wherein one group of frequencies is
For combining digital vector baseband signals with digital local vibration sources and corresponding digital mixerss1Up-conversion to carrier frequency +.>
Digital vector radio frequency signals of (a); another group of frequencies is +.>
For combining digital vector baseband signals with digital local vibration sources and corresponding digital mixerss2Up-conversion to carrier frequency +.>
Digital vector radio frequency signals of (a);
two digital bandpass DSM modules with center frequency of
The digital band pass DSM module of (C) will have a carrier frequency of +.>
Is converted into a digital sequence containing only +1 and-1s1 * The center frequency is +.>
Digital bandpass DSM module of (C)The carrier frequency is +.>
Is converted into a digital sequence containing only +1 and-1s2 * ；
Digital-to-analog converter for implementing digital sequences with the same rates1 * Ands2 * conversion from the digital domain to the analog domain,s1 * ands2 * are fed into in-phase I and quadrature-phase Q input ports of the same digital-to-analog converter, respectively, to provide I and Q drive inputs for the I/Q modulator;
two electric amplifiers for amplifying the driving inputs of I and Q paths of the I/Q modulator, respectively;
single mode laser for providing I/Q modulator with operating frequency
Is a continuous wavelength optical carrier input;
an I/Q modulator for performing baseband optical QPSK modulation to generate an equivalent baseband optical QPSK signal containing carrier frequency at the same time
Is carried with vector signalss1Is the optical radio frequency wave and carrier frequency of
Is carried with vector signalss2Is a light frequency wave of (a);
the erbium-doped optical fiber amplifier is used for amplifying the generated equivalent baseband optical QPSK signal;
a single mode fiber for transmitting the generated equivalent baseband optical QPSK signal;
homodyne coherent receiver and operating frequency of
For nulling the received equivalent baseband optical QPSK signalDetecting the difference, and sending the detected I-path and Q-path electric signals into an analog-to-digital converter;
the analog-to-digital converter is used for converting the I-path and Q-path electric signals obtained through homodyne detection from an analog domain to a digital domain;
a digital QPSK recovery and demodulation module for recovering the transmitted digital sequence from the I and Q signals obtained by homodyne detections1 * Ands2 * ；
two digital band pass filters, one with a center frequency of
For recovering a digital sequence from a recovered digital sequences1 * Filtering the original vector signals1The other center frequency is +.>
For recovering a digital sequence from a recovered digital sequences2 * Filtering the original vector signals2；
And the two digital vector baseband signal demodulation modules are used for recovering the original transmitted bit stream.
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