CN116614185A - Photon-assisted ultra-wideband millimeter wave multichannel receiver - Google Patents
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Abstract
The invention provides a photon-assisted ultra-wideband millimeter wave multichannel receiver, which adopts the technologies of radio-frequency-free local oscillator microwave photon frequency conversion, high-frequency stable multichannel channelized optical local oscillator generation and multichannel parallel coherent detection to channelize and divide ultra-wideband millimeter wave multichannel signals, and realizes the function of receiving ultra-wideband millimeter wave signals in a high-sensitivity parallel narrow band through parallel channel analog-digital conversion and receiving processing under the constraint of a low-cost analog-digital converter, thereby supporting the large-capacity and long-distance transmission of millimeter wave wireless communication. The invention solves the problems of ultra-wideband signal receiving, analog-to-digital conversion and processing in millimeter wave wireless communication, supports the millimeter wave wireless communication to realize large-capacity and long-distance transmission, and can be applied to an ultra-wideband millimeter wave wireless communication system; the principle is simple, the scheme is simple and efficient, and the method has high application value.
Description
Technical Field
The invention belongs to the technical field of microwave photonics, and particularly relates to a photon-assisted ultra-wideband millimeter wave multichannel receiver.
Background
The millimeter wave of E band/W band has tens of GHz available spectrum resources, which is the development direction of future wireless communication. The device is limited by the bandwidth bottleneck of the electronic device, and millimeter wave radio frequency signals with the bandwidth of tens of GHz are directly detected, so that the device is high in cost and high in difficulty. Based on the microwave photon technology, the millimeter wave radio frequency signal can be directly converted to the baseband, the characteristics of wide bandwidth, low loss and the like of an optical device are fully utilized, and the cost of mixing and filtering the high frequency radio frequency signal can be reduced. However, at present, the domestic high quantization bit number and large bandwidth analog-to-digital converter still has a bottleneck, the difficulty of directly performing analog-to-digital conversion on tens of GHz ultra-wideband signals converted to the baseband is great, and the ultra-wideband baseband signals are sensitive to multipath effects of wireless propagation paths and have high in-band noise, so that the ultra-wideband baseband signals are not suitable for long-distance wireless transmission.
Disclosure of Invention
The invention aims to solve the technical problems that: a photon-assisted ultra-wideband millimeter wave multi-channel receiver is provided for high-sensitivity parallel narrow-band reception of ultra-wideband millimeter wave signals.
The technical scheme adopted by the invention for solving the technical problems is as follows: a photon-assisted ultra-wideband millimeter wave multi-channel receiver comprises a narrow linewidth light source ECL, an electro-optic modulator, a carrier driving signal source, a first fiber Bragg grating FBG1, an optical frequency comb generator, a second fiber Bragg grating FBG2, a first optical IQ modulator, …, an Nth optical IQ modulator, a first local oscillator driving signal source, …, an Nth local oscillator driving signal source, a first coherent receiver, … and an Nth coherent receiver; the carrier driving signal source is connected with the driving end of the electro-optical modulator and used for driving the electro-optical modulator; the first local oscillator drive signal source, the … and the Nth local oscillator drive signal source are correspondingly connected with the driving ends of the first optical IQ modulator 1, the … and the Nth optical IQ modulator N respectively and are used for driving the first optical IQ modulator 1, the … and the Nth optical IQ modulator N respectively; the narrow linewidth light source ECL is used for generating two paths of continuous light waves; the first path of output end of the narrow linewidth light source ECL is sequentially connected with the electro-optical modulator and the first fiber Bragg grating FBG1, and is used for injecting a first path of light waves into the electro-optical modulator; the 1 st order sideband signal output by the first fiber Bragg grating FBG1 is input to a first coherent receiver, a … and an Nth coherent receiver respectively after being split, and is used as a signal carrier; the second output end of the narrow linewidth light source ECL is sequentially connected with an optical frequency comb generator and a second fiber Bragg grating FBG2, and is used for injecting a second path of light waves into the optical frequency comb generator; the optical signals output by the second fiber Bragg grating FBG2 are input to a first optical IQ modulator, a … and an Nth optical IQ modulator respectively after being split, and single-sideband modulation is carried out; the first optical IQ modulator, … and the Nth optical IQ modulator are respectively connected with the first coherent receiver, … and the Nth coherent receiver and are used for outputting the modulated signals as local oscillation signals, so that ultra-wideband signals are mapped onto carriers, and radio-frequency-free local oscillation microwave photon frequency conversion is completed.
According to the scheme, the carrier driving signal source, the first local oscillator driving signal source, the … and the Nth local oscillator driving signal source are millimeter wave radio frequency signal sources.
Further, the electro-optical modulator is a phase modulator, and the frequency of the millimeter wave radio frequency carrier wave driving the electro-optical modulation is f s Millimeter wave radio frequency carrier angular frequency w s The method comprises the following steps:
w s ＝2πf s ，
set V π Is half-wave voltage of the phase modulator, R is the ratio of the amplitude of the radio frequency signal to the amplitude of the half-wave voltage, and t is time, and then the electro-optically modulated millimeter wave radio frequency carrier signal V is driven d The method comprises the following steps:
V d ＝RV π sin(w s t)，
let A be the output electric field intensity of the light source, w c At the center carrier frequency, the optical signal E is input by the electro-optic modulator in The method comprises the following steps:
E in ＝Aexp(jw c t)，
after passing through the electro-optical modulator, the output optical signal E out The method comprises the following steps:
after being carried in, the method comprises the following steps:
E out ＝Aexp(jw c t)exp(jπR sin w s t) (2)，
J n (pi R) is n-order Bessel functions of the first class, and Bessel functions are developed to obtain the following formula:
the optical signal output by the electro-optic modulator is a 1 st order sideband, and the formula (3) is expressed as:
after the optical signal output by the electro-optical modulator passes through the first fiber Bragg grating FBG1, the right 1-order sideband is selected as a signal carrier to be output through a reflection port of the first fiber Bragg grating FBG1, and the optical field is expressed as:
E sig_out1 ＝A·J -1 (πR)exp[j(w c -w s )t] (5)。
further, the frequencies of the driving electric signals sent by the first local oscillation driving signal source, the … and the Nth local oscillation driving signal source are respectively f L1 、f L2 、…、f LN The method comprises the steps of carrying out a first treatment on the surface of the The optical frequency comb generator is used for generating frequency interval f k Is a light frequency of (a) a light source; the second fiber bragg grating FBG2 is used for the secondary optical frequency f k Filtering out a comb tooth, dividing the comb tooth into N paths, and then respectively and correspondingly injecting the N paths of comb teeth into a first optical IQ modulator, a … optical IQ modulator and an Nth optical IQ modulator to carry out single-side band modulation; the output N paths of single-sideband modulation signals are respectively used as local oscillation signals of a first coherent receiver, a … and an Nth coherent receiver, and are coherently received and detected with a signal carrier reflected and output by a first fiber Bragg grating FBG 1;
let the center frequency of the N-th band of the ultra-wideband millimeter wave signal be f sN And m is an integer, and the frequency relation of the N paths of single-sideband modulation signals satisfies the following conditions:
f sN ＝mf k +f LN (6)。
furthermore, fk is equal to or greater than 25GHz to avoid frequency aliasing interference generated by the coherent receiver according to the reflection bandwidth of the second fiber Bragg grating FBG 2.
According to the scheme, the electro-optic modulator is an intensity modulator.
According to the above scheme, the optical signals output by the first fiber bragg grating FBG1 and the second fiber bragg grating FBG2 are split by different optical couplers OC.
The beneficial effects of the invention are as follows:
1. the photon-assisted ultra-wideband millimeter wave multichannel receiver realizes the function of receiving ultra-wideband millimeter wave signals in a high-sensitivity parallel narrow-band mode by adopting the technologies of radio-frequency-free local oscillator microwave photon frequency conversion, high-frequency stable multichannel channelized optical local oscillator generation and multichannel parallel coherent detection.
2. The invention adopts the microwave photon channelized receiving technology to channelize and divide the ultra-wideband millimeter wave multichannel signals, and realizes the high-sensitivity parallel narrow-band receiving of the ultra-wideband millimeter wave signals through the parallel channel analog-digital conversion and the receiving processing under the constraint of the low-cost analog-digital converter, thereby supporting the high-capacity and long-distance transmission of millimeter wave wireless communication.
3. The invention realizes the division and high-sensitivity parallel reception of ultra-wideband millimeter wave signal channels, solves the problems of ultra-wideband signal reception, analog-to-digital conversion and processing in millimeter wave wireless communication, supports the millimeter wave wireless communication to realize large-capacity and long-distance transmission, and can be applied to an ultra-wideband millimeter wave wireless communication system; the principle is simple, the scheme is simple and efficient, and the method has high application value.
Drawings
Fig. 1 is a schematic diagram of an embodiment of the present invention.
In the figure: ECL: an external cavity laser; OC: an optical coupler; FBG: fiber Bragg gratings.
Fig. 2 is a diagram of a dual-band millimeter wave signal in accordance with an embodiment of the present invention.
FIG. 3 is a diagram of the output signal of the FBG1 according to an embodiment of the invention.
Fig. 4 is a graph of an I-path output electrical spectrum after coherent reception of a left band signal in accordance with an embodiment of the present invention.
Fig. 5 is a graph of an I-path output electrical spectrum after coherent reception of a right band signal in accordance with an embodiment of the present invention.
Fig. 6 is a diagram of a left band signal received spectrum and a low pass filtered spectrum of an embodiment of the present invention.
Fig. 7 is a constellation diagram of a left band signal after signal processing according to an embodiment of the present invention.
In the figure: (a) after matched filtering; (b) after channel estimation; (c) a post-phase estimation map.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
Referring to fig. 1, the embodiment of the invention adopts main technologies such as radio-frequency-free local oscillator microwave photon frequency conversion, high-frequency stable multichannel channelized optical local oscillator generation, multichannel parallel coherent detection and the like. The radio frequency-free local oscillator microwave photon frequency conversion technology adopts millimeter wave radio frequency carrier signals to directly drive an electro-optic modulator, and utilizes the characteristic of large bandwidth of the electro-optic modulator to map ultra-wideband signals onto 1-order side bands output by the electro-optic modulator; the high-frequency stable multipath channelized optical local oscillator generating technology is that an optical frequency comb technology and a single sideband modulation technology are utilized to generate multipath channelized optical local oscillators with high stability relative to the frequency of an optical signal carrier, and each path of optical local oscillator is used as a local oscillator end input signal of multipath parallel coherent detection; the multipath parallel coherent detection technology is to split optical signal carriers and perform multipath parallel coherent detection, so that high-sensitivity narrowband detection of ultra-wideband millimeter wave signals is realized.
The structural schematic of the present invention is shown in fig. 1 below. First, continuous light waves generated by a narrow linewidth light source (ECL) are divided into two paths, one path is injected into an electro-optical modulator, and the electro-optical modulator is driven by millimeter wave radio frequency signals. The multi-channel receiver provided by the invention can select a phase modulator and an intensity modulator. Suppose a phase modulator is selected whose output optical signal is as follows:
wherein E is in ＝Aexp(jw c t), A is the output electric field intensity of the light source, wc is the center carrier frequency. V (V) d ＝RV π sin(w s t)，w s ＝2πf s Fs is millimeter wave radio frequency carrier frequency, V π For the half-wave voltage of the phase modulator, R is the ratio of the amplitude of the radio frequency signal to the amplitude of the half-wave voltage, so equation (1) can be expressed as follows:
E out ＝Aexp(jw c t)exp(jπR sin w s t) (2)
the Bessel function is developed as follows:
wherein J is n (pi R) is a n-th order Bessel function of the first type. The millimeter wave wireless communication signal has smaller power at the receiving end, resulting in smaller R, so that only 1 st order sidebands are generated, and therefore, the formula (3) can be expressed as follows:
after passing through the fiber Bragg grating (FBG 1), the right 1-order sideband is selected, the signal carrier is output through the reflecting port, and the optical field is expressed as follows:
E sig_out1 ＝A·J -1 (πR)exp[j(w c -w s )t] (5)
another light wave generated by a narrow linewidth light source (ECL) generates optical frequency with frequency interval fk by an optical frequency comb generator, then filters out one comb tooth by an optical fiber Bragg grating (FBG 2), then divides the comb tooth into N paths, and each path is respectively injected into an optical IQ modulator to carry out single-sideband modulation, and the driving electric signal frequency is f respectively L1 、f L2 、…、f LN . Each single sideband modulation signal is used as local oscillation signal of parallel coherent receiver and is combined with FBG1And carrying out coherent reception and signal detection on the reflected output signal carrier. In order to achieve multi-channel reception, the frequency relationship needs to satisfy the following condition.
f sN ＝mf k +f LN (6)
Wherein f sN The center frequency of the N-th band of the ultra-wideband millimeter wave signal with the center frequency fs, m is an integer, and fk is equal to or greater than 25GHz in consideration of the FBG reflection bandwidth and frequency aliasing interference at a coherent receiver.
The embodiment of the invention is as follows: setting up a millimeter wave wireless communication system, wherein the millimeter wave radio frequency is 35GHz, and a Quadrature Phase Shift Keying (QPSK) modulation is adopted as a modulation format; two frequency bands are designed, the interval between the center frequency of the two frequency bands and zero frequency of a baseband signal is 2GHz, and the baud rate of each frequency band is 2.5Gbaud. The frequency interval of the optical frequency comb is 30GHz, and the frequencies of the two single-sideband modulation driving radio frequency sources are 3GHz and 7GHz respectively. FIG. 2 shows the generated dual-band millimeter wave signal with a center frequency of 35GHz, and after passing through the photon-assisted ultra-wideband millimeter wave two-channel receiver, the FBG1 outputs a signal as shown in FIG. 3. The signal and local oscillation signals generated by the 3GHz (corresponding to left sideband) and 7GHz (corresponding to right sideband) radio frequency source driving optical IQ modulator are respectively subjected to coherent detection, and I-path output electric spectrums are respectively shown in fig. 4 and 5. After analog-to-digital conversion and low-pass filtering of the left sideband signal, the spectrum is shown in FIG. 6. Finally, the left sideband signal is processed by utilizing a digital signal processing algorithm, and the constellation diagram in the figure 7 is observed to recover to be normal after matched filtering, channel estimation and phase estimation, and the error rate is 0, so that the photon-assisted ultra-wideband millimeter wave multi-channel receiver provided by the invention is proved to be feasible.
The above embodiment is only typical application of the patent, and the specific implementation of the patent includes baseband signal modulation modes (such as QPSK and 8PSK modulation) with different orders, ultra-wideband millimeter wave signal down-conversion by adopting an intensity modulator to replace a phase modulator, FBG replacement by adopting an optical wave demultiplexer, optical frequency comb generation by adopting different modes, and the like.
The above embodiments are merely for illustrating the design concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, the scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes or modifications according to the principles and design ideas of the present invention are within the scope of the present invention.
Claims (7)
1. A photon-assisted ultra wideband millimeter wave multi-channel receiver, characterized by: the optical fiber Bragg grating comprises a narrow linewidth light source ECL, an electro-optical modulator, a carrier driving signal source, a first optical fiber Bragg grating FBG1, an optical frequency comb generator, a second optical fiber Bragg grating FBG2, a first optical IQ modulator, …, an Nth optical IQ modulator, a first local oscillator driving signal source, …, an Nth local oscillator driving signal source, a first coherent receiver, … and an Nth coherent receiver;
the carrier driving signal source is connected with the driving end of the electro-optical modulator and used for driving the electro-optical modulator; the first local oscillator drive signal source, the … and the Nth local oscillator drive signal source are correspondingly connected with the driving ends of the first optical IQ modulator 1, the … and the Nth optical IQ modulator N respectively and are used for driving the first optical IQ modulator 1, the … and the Nth optical IQ modulator N respectively;
the narrow linewidth light source ECL is used for generating two paths of continuous light waves;
the first path of output end of the narrow linewidth light source ECL is sequentially connected with the electro-optical modulator and the first fiber Bragg grating FBG1, and is used for injecting a first path of light waves into the electro-optical modulator; the 1 st order sideband signal output by the first fiber Bragg grating FBG1 is input to a first coherent receiver, a … and an Nth coherent receiver respectively after being split, and is used as a signal carrier;
the second output end of the narrow linewidth light source ECL is sequentially connected with an optical frequency comb generator and a second fiber Bragg grating FBG2, and is used for injecting a second path of light waves into the optical frequency comb generator; the optical signals output by the second fiber Bragg grating FBG2 are input to a first optical IQ modulator, a … and an Nth optical IQ modulator respectively after being split, and single-sideband modulation is carried out; the first optical IQ modulator, … and the Nth optical IQ modulator are respectively connected with the first coherent receiver, … and the Nth coherent receiver and are used for outputting the modulated signals as local oscillation signals, so that ultra-wideband signals are mapped onto carriers, and radio-frequency-free local oscillation microwave photon frequency conversion is completed.
2. A photon-assisted ultra-wideband millimeter wave multi-channel receiver according to claim 1, wherein: the carrier driving signal source, the first local oscillator driving signal source, the … and the Nth local oscillator driving signal source are millimeter wave radio frequency signal sources.
3. A photon-assisted ultra-wideband millimeter wave multi-channel receiver according to claim 2, wherein: the electro-optic modulator is a phase modulator, and the frequency of a millimeter wave radio frequency carrier wave driving the electro-optic modulation is f s Millimeter wave radio frequency carrier angular frequency w s The method comprises the following steps:
w s ＝2πf s ，
set V π Is half-wave voltage of the phase modulator, R is the ratio of the amplitude of the radio frequency signal to the amplitude of the half-wave voltage, and t is time, and then the electro-optically modulated millimeter wave radio frequency carrier signal V is driven d The method comprises the following steps:
V d ＝RV π sin(w s t)，
let A be the output electric field intensity of the light source, w c At the center carrier frequency, the optical signal E is input by the electro-optic modulator in The method comprises the following steps:
E in ＝Aexp(jw c t)，
after passing through the electro-optical modulator, the output optical signal E out The method comprises the following steps:
after being carried in, the method comprises the following steps:
E out ＝Aexp(jw c t)exp(jπRsinw s t) (2)，
J n (pi R) is n-order Bessel functions of the first class, and Bessel functions are developed to obtain the following formula:
the optical signal output by the electro-optic modulator is a 1 st order sideband, and the formula (3) is expressed as:
after the optical signal output by the electro-optical modulator passes through the first fiber Bragg grating FBG1, the right 1-order sideband is selected as a signal carrier to be output through a reflection port of the first fiber Bragg grating FBG1, and the optical field is expressed as:
E sig_out1 ＝A·J -1 (πR)exp[j(w c -w s )t] (5)。
4. a photon-assisted ultra-wideband millimeter wave multi-channel receiver according to claim 2, wherein: setting the frequencies of the driving electric signals sent by the first local oscillation driving signal source, the … and the Nth local oscillation driving signal source to be f respectively L1 、f L2 、…、f LN The method comprises the steps of carrying out a first treatment on the surface of the The optical frequency comb generator is used for generating frequency interval f k Is a light frequency of (a) a light source; the second fiber bragg grating FBG2 is used for the secondary optical frequency f k Filtering out a comb tooth, dividing the comb tooth into N paths, and then respectively and correspondingly injecting the N paths of comb teeth into a first optical IQ modulator, a … optical IQ modulator and an Nth optical IQ modulator to carry out single-side band modulation; the output N paths of single-sideband modulation signals are respectively used as local oscillation signals of a first coherent receiver, a … and an Nth coherent receiver, and are coherently received and detected with a signal carrier reflected and output by a first fiber Bragg grating FBG 1;
let the center frequency of the N-th band of the ultra-wideband millimeter wave signal be f sN And m is an integer, and the frequency relation of the N paths of single-sideband modulation signals satisfies the following conditions:
f sN ＝mf k +f LN (6)。
5. the photon-assisted ultra-wideband millimeter wave multi-channel receiver of claim 4, wherein:
according to the reflection bandwidth of the second fiber Bragg grating FBG2, fk is more than or equal to 25GHz to avoid frequency aliasing interference generated by a coherent receiver.
6. A photon-assisted ultra-wideband millimeter wave multi-channel receiver according to claim 1, wherein:
the electro-optic modulator is an intensity modulator.
7. A photon-assisted ultra-wideband millimeter wave multi-channel receiver according to claim 1, wherein:
the optical signals output by the first fiber Bragg grating FBG1 and the second fiber Bragg grating FBG2 are respectively split by different optical couplers OC.
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