CN111585588A - Wireless transmission method and device for Ku waveband signal - Google Patents
Wireless transmission method and device for Ku waveband signal Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0007—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
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Abstract
The invention discloses a wireless transmission method and device of Ku waveband signals. The wireless transmission method of the Ku-band signal comprises the following steps: performing first preprocessing on service data to obtain a low-intermediate frequency signal with a center frequency of f, a bandwidth of W and a transmission rate of Rb, wherein f satisfies the following conditions: f is more than 1GHz and less than 2GHz, and W meets the following conditions: w is more than 1.5GHz and less than 3GHz, and Rb meets the following requirements: 3Gbps < Rb < 10.5 Gbps; up-converting the low-intermediate frequency signal to a Ku wave band signal; transmitting a Ku-band signal. The wireless transmission device for the Ku-band signal comprises: the device comprises a transmitting signal processing module, a transmitting signal intermediate frequency conversion module, a transmitting signal radio frequency front end module, a receiving signal intermediate frequency conversion module and a receiving signal processing module. By adopting the invention, the backbone transmission capability with the Ku wave band bandwidth of 2.16GHz, the peak transmission rate of 3.33Gbps-10.1Gbps and the transmission distance of not less than 8.4 kilometers can be realized in a complex environment without depending on fixed communication infrastructures such as optical fibers and the like.
Description
Technical Field
The invention relates to the field of communication, in particular to a Ku-band signal wireless transmission method and device.
Background
The optical fiber network has the advantage of high transmission rate, and can ensure that data such as characters, voice, video and the like are transmitted in a Gbps-level ultrahigh-rate long-distance manner. Therefore, the optical fiber network is developed as the core of the backbone network. However, due to the transmission characteristics of the optical fiber network, the backbone transmission network is deployed by relying heavily on a single fixed communication infrastructure, and it is difficult to obtain high-speed data transmission capability in a complex environment without the optical fiber network, such as a mountainous area.
Disclosure of Invention
The embodiment of the invention provides a wireless transmission method and device of Ku waveband signals, which are used for solving the problem that high-speed data transmission capacity is difficult to obtain in a complex environment without an optical fiber network in the prior art.
In a first aspect, an embodiment of the present invention provides a method for wirelessly transmitting a Ku-band signal, including:
performing first preprocessing on service data to obtain a low-intermediate frequency signal with a center frequency of f, a bandwidth of W and a transmission rate of Rb, wherein f satisfies: f is more than 1GHz and less than 2GHz, and W satisfies the following conditions: 1.5GHz < W < 3GHz, wherein Rb satisfies: 3Gbps < Rb < 10.5 Gbps;
up-converting the low intermediate frequency signal to a Ku waveband signal;
and transmitting the Ku waveband signal.
According to some embodiments of the invention, the first preprocessing of the service data includes:
modulating the service data to obtain a modulation signal;
respectively executing up-conversion processing on the modulation signals by adopting an N-path parallel processing mode to obtain N-path frequency conversion data;
synthesizing the N paths of frequency conversion data by adopting a carrier aggregation technology to obtain a synthesized signal;
and sequentially performing D/A processing and energy gain control processing on the synthesized signal.
In some embodiments of the present invention, said modulating said traffic data comprises:
performing RS encoding on the service data;
performing QPSK modulation, or 16QAM modulation, or 64QAM modulation on the service data subjected to RS coding;
OFDM modulation is performed on traffic data on which QPSK modulation, or 16QAM modulation, or 64QAM modulation is performed.
According to some embodiments of the invention, the f satisfies: f is 1.536 GHz;
the W satisfies: w ═ 2.16 GHz;
the Rb satisfies: rb is more than or equal to 3.33Gbps and less than or equal to 10.1 Gbps.
According to some embodiments of the invention, the frequency of the Ku band signal is 14.05 GHz.
In a second aspect, an embodiment of the present invention provides a method for wirelessly transmitting a Ku-band signal, including:
receiving a Ku waveband signal;
down-converting the Ku waveband signal to a low-intermediate frequency signal with a center frequency of f, a bandwidth of W and a transmission rate of Rb, wherein f satisfies the following conditions: f is more than 1GHz and less than 2GHz, and W satisfies the following conditions: 1.5GHz < W < 3GHz, wherein Rb satisfies: 3Gbps < Rb < 10.5 Gbps;
and carrying out second preprocessing on the low-intermediate frequency signal to obtain service data.
According to some embodiments of the invention, the second preprocessing of the low intermediate frequency signal comprises:
sequentially performing energy gain control processing and A/D processing on the low and intermediate frequency signals to obtain a synthesized signal;
carrying out carrier separation on the synthesized signal to obtain N paths of frequency conversion data;
performing down-conversion processing on the N paths of frequency conversion data respectively by adopting an N-path parallel processing mode to obtain modulation signals;
and demodulating the modulated signal.
In some embodiments of the invention, said demodulating said modulated signal comprises:
detecting and synchronizing the modulation signal by adopting a training sequence self-correlation algorithm, and performing channel estimation and channel equalization processing;
performing OFDM demodulation on the modulated signal subjected to signal estimation and channel equalization;
performing QPSK demodulation, or 16QAM demodulation, or 64QAM demodulation on the modulated signal on which the OFDM demodulation is performed;
RS decoding is performed on the modulated signal on which QPSK demodulation, or 16QAM demodulation, or 64QAM demodulation is performed.
Further, the method also comprises the following steps:
and the rate adaptation of the dynamically changed channel is carried out by adopting a rate adaptive adjustment method, and QPSK demodulation, 16QAM demodulation or 64QAM demodulation is dynamically selected according to different channel characteristics.
In a third aspect, an embodiment of the present invention provides a wireless transmission apparatus for a Ku-band signal, including:
a transmission signal processing module, configured to perform first preprocessing on service data to obtain a low-intermediate frequency signal with a center frequency of f, a bandwidth of W, and a transmission rate of Rb, where f satisfies: f is more than 1GHz and less than 2GHz, and W satisfies the following conditions: 1.5GHz < W < 3GHz, wherein Rb satisfies: 3Gbps < Rb < 10.5 Gbps;
the transmitting signal intermediate frequency conversion module is in communication connection with the transmitting signal processing module and is used for up-converting the low intermediate frequency signal to a Ku waveband signal;
and the transmitting signal radio frequency front end module is in communication connection with the transmitting signal intermediate frequency conversion module and is used for transmitting the Ku waveband signal.
According to some embodiments of the invention, the transmit signal processing module comprises:
the transmission signal FPGA is used for modulating the service data to obtain a modulation signal, respectively executing up-conversion processing on the modulation signal by adopting an N-path parallel processing mode to obtain N-path frequency conversion data, and synthesizing the N-path frequency conversion data by adopting a carrier aggregation technology to obtain a synthesized signal;
the transmitting signal D/A is in communication connection with the transmitting signal FPGA and is used for performing D/A processing on the synthesized signal;
and the emission signal VGA is in communication connection with the emission signal D/A, and is used for executing energy gain control processing on the synthesized signal after the D/A processing is executed.
In some embodiments of the invention, the transmission signal FPGA comprises:
an encoder for performing RS encoding on the service data;
the modulator is in communication connection with the encoder and is used for executing QPSK modulation, 16QAM modulation or 64QAM modulation on the service data after RS encoding is executed;
and the IFFT is in communication connection with the modulator and is used for carrying out OFDM modulation on the service data after QPSK modulation, 16QAM modulation or 64QAM modulation is carried out.
In a fourth aspect, an embodiment of the present invention further provides a wireless transmission apparatus for a Ku-band signal, including:
the receiving signal radio frequency front-end module is used for receiving a Ku waveband signal;
a receiving signal intermediate frequency conversion module, communicatively connected to the receiving signal radio frequency front end module, where the receiving signal intermediate frequency conversion module is configured to down-convert the Ku band signal to a low intermediate frequency signal with a center frequency of f, a bandwidth of W, and a transmission rate of Rb, where f satisfies: f is more than 1GHz and less than 2GHz, and W satisfies the following conditions: 1.5GHz < W < 3GHz, wherein Rb satisfies: 3Gbps < Rb < 10.5 Gbps;
and the received signal processing module is in communication connection with the received signal intermediate frequency conversion module and is used for performing second preprocessing on the low intermediate frequency signal so as to obtain service data.
According to some embodiments of the invention, the received signal processing module comprises:
receiving a signal VGA for executing energy gain control processing on the low-intermediate frequency signal;
the receiving signal A/D is in communication connection with the receiving signal VGA and is used for performing A/D processing on the low-intermediate frequency signal after the energy gain control processing is performed so as to obtain a synthetic signal;
and the received signal FPGA is in A/D communication connection with the received signal, and is used for carrying out carrier separation on the synthesized signal so as to obtain N paths of frequency conversion data, respectively executing down-conversion processing on the N paths of frequency conversion data by adopting an N paths of parallel processing mode so as to obtain a modulated signal, and demodulating the modulated signal.
Further, the receiving signal FPGA includes:
receiving signal synchronous detection, which is used for detecting and synchronizing the modulation signal by adopting a training sequence self-correlation algorithm, and carrying out channel estimation and channel equalization processing;
an FFT for performing OFDM demodulation on the modulated signal after signal estimation and channel equalization processing;
a demodulator communicatively coupled to the FFT, the demodulator configured to perform QPSK demodulation, or 16QAM demodulation, or 64QAM demodulation on the demodulated signal after the OFDM demodulation is performed;
a decoder in communication with the demodulator, the decoder configured to perform RS decoding on the demodulated signal after performing QPSK demodulation, or 16QAM demodulation, or 64QAM demodulation.
By adopting the embodiment of the invention, high-speed and long-distance transmission can be realized in a complex environment, the system structure is simple, and the dependence on a fixed communication infrastructure is not required.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. In the drawings:
fig. 1 is a flowchart of a method for wireless transmission of Ku-band signals according to an embodiment of the present invention;
FIG. 2 is a flowchart of a method for wireless transmission of Ku-band signals according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a wireless transmission device for Ku-band signals according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a wireless transmission device for Ku-band signals according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a wireless transmission apparatus for Ku-band signals according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a wireless transmission device for Ku-band signals according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a wireless transmission device for Ku-band signals according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in fig. 1, in a first aspect, an embodiment of the present invention provides a method for wirelessly transmitting a Ku-band signal, including:
s11, performing a first preprocessing on the service data to obtain a low-if signal with a center frequency of f, a bandwidth of W, and a transmission rate of Rb, where f satisfies: f is more than 1GHz and less than 2GHz, and W satisfies the following conditions: 1.5GHz < W < 3GHz, wherein Rb satisfies: 3Gbps < Rb < 10.5 Gbps.
And S12, up-converting the low intermediate frequency signal to a Ku waveband signal.
And S13, transmitting the Ku waveband signal.
By adopting the embodiment of the invention, high-speed and long-distance transmission can be realized in a complex environment, the system structure is simple, and the dependence on a fixed communication infrastructure is not required.
On the basis of the above-described embodiment, various modified embodiments are further proposed, and it is to be noted herein that, in order to make the description brief, only the differences from the above-described embodiment are described in the various modified embodiments.
According to some embodiments of the invention, the first preprocessing of the service data includes:
modulating the service data to obtain a modulation signal;
respectively executing up-conversion processing on the modulation signals by adopting an N-path parallel processing mode to obtain N-path frequency conversion data;
synthesizing the N paths of frequency conversion data by adopting a carrier aggregation technology to obtain a synthesized signal;
and sequentially performing D/A processing and energy gain control processing on the synthesized signal.
In some embodiments of the present invention, said modulating said traffic data comprises:
performing RS encoding on the service data;
performing QPSK modulation, or 16QAM modulation, or 64QAM modulation on the service data subjected to RS coding;
OFDM modulation is performed on traffic data on which QPSK modulation, or 16QAM modulation, or 64QAM modulation is performed.
According to some embodiments of the invention, the f satisfies: f is 1.536 GHz;
the W satisfies: w ═ 2.16 GHz;
the Rb satisfies: rb is more than or equal to 3.33Gbps and less than or equal to 10.1 Gbps.
According to some embodiments of the invention, the frequency of the Ku band signal is 14.05 GHz.
As shown in fig. 2, in a second aspect, an embodiment of the present invention provides a method for wirelessly transmitting a Ku-band signal, including:
and S21, receiving the Ku-band signal.
S22, down-converting the Ku waveband signal to a low-intermediate frequency signal with a center frequency of f, a bandwidth of W and a transmission rate of Rb, wherein f satisfies: f is more than 1GHz and less than 2GHz, and W satisfies the following conditions: 1.5GHz < W < 3GHz, wherein Rb satisfies: 3Gbps < Rb < 10.5 Gbps.
And S23, performing second preprocessing on the low intermediate frequency signal to obtain service data.
By adopting the embodiment of the invention, high-speed and long-distance transmission can be realized in a complex environment, the system structure is simple, and the dependence on a fixed communication infrastructure is not required.
On the basis of the above-described embodiment, various modified embodiments are further proposed, and it is to be noted herein that, in order to make the description brief, only the differences from the above-described embodiment are described in the various modified embodiments.
According to some embodiments of the invention, the second preprocessing of the low intermediate frequency signal comprises:
sequentially performing energy gain control processing and A/D processing on the low and intermediate frequency signals to obtain a synthesized signal;
carrying out carrier separation on the synthesized signal to obtain N paths of frequency conversion data;
performing down-conversion processing on the N paths of frequency conversion data respectively by adopting an N-path parallel processing mode to obtain modulation signals;
and demodulating the modulated signal.
In some embodiments of the invention, said demodulating said modulated signal comprises:
detecting and synchronizing the modulation signal by adopting a training sequence self-correlation algorithm, and performing channel estimation and channel equalization processing;
performing OFDM demodulation on the modulated signal subjected to signal estimation and channel equalization;
performing QPSK demodulation, or 16QAM demodulation, or 64QAM demodulation on the modulated signal on which the OFDM demodulation is performed;
RS decoding is performed on the modulated signal on which QPSK demodulation, or 16QAM demodulation, or 64QAM demodulation is performed.
Further, the method further comprises:
and the rate adaptation of the dynamically changed channel is carried out by adopting a rate adaptive adjustment method, and QPSK demodulation, 16QAM demodulation or 64QAM demodulation is dynamically selected according to different channel characteristics.
According to some embodiments of the invention, the f satisfies: f is 1.536 GHz;
the W satisfies: w ═ 2.16 GHz;
the Rb satisfies: rb is more than or equal to 3.33Gbps and less than or equal to 10.1 Gbps.
According to some embodiments of the invention, the frequency of the Ku band signal is 14.05 GHz.
As shown in fig. 3, in a third aspect, an embodiment of the present invention provides a wireless transmission apparatus 100 for a Ku-band signal, including:
a transmit signal processing module 110, configured to perform first preprocessing on service data to obtain a low-intermediate frequency signal with a center frequency of f, a bandwidth of W, and a transmission rate of Rb, where f satisfies: f is more than 1GHz and less than 2GHz, and W satisfies the following conditions: 1.5GHz < W < 3GHz, wherein Rb satisfies: 3Gbps < Rb < 10.5 Gbps;
a transmit signal intermediate frequency conversion module 120, communicatively connected to the transmit signal processing module 110, where the transmit signal intermediate frequency conversion module 120 is configured to up-convert the low intermediate frequency signal to a Ku band signal;
a transmission signal rf front-end module 130, communicatively connected to the transmission signal if conversion module 120, where the transmission signal rf front-end module 130 is configured to transmit the Ku band signal.
By adopting the embodiment of the invention, high-speed and long-distance transmission can be realized in a complex environment, the system structure is simple, and the dependence on a fixed communication infrastructure is not required.
On the basis of the above-described embodiment, various modified embodiments are further proposed, and it is to be noted herein that, in order to make the description brief, only the differences from the above-described embodiment are described in the various modified embodiments.
As shown in fig. 6, according to some embodiments of the invention, the transmission signal processing module 110 includes:
the transmission signal FPGA is used for modulating the service data to obtain a modulation signal, respectively executing up-conversion processing on the modulation signal by adopting an N-path parallel processing mode to obtain N-path frequency conversion data, and synthesizing the N-path frequency conversion data by adopting a carrier aggregation technology to obtain a synthesized signal;
the transmitting signal D/A is in communication connection with the transmitting signal FPGA and is used for performing D/A processing on the synthesized signal;
and the emission signal VGA is in communication connection with the emission signal D/A, and is used for executing energy gain control processing on the synthesized signal after the D/A processing is executed.
As shown in fig. 6, in some embodiments of the invention, the transmission signal FPGA includes:
an encoder for performing RS encoding on the service data;
the modulator is in communication connection with the encoder and is used for executing QPSK modulation, 16QAM modulation or 64QAM modulation on the service data after RS encoding is executed;
and the IFFT is in communication connection with the modulator and is used for carrying out OFDM modulation on the service data after QPSK modulation, 16QAM modulation or 64QAM modulation is carried out.
According to some embodiments of the invention, the f satisfies: f is 1.536 GHz;
the W satisfies: w ═ 2.16 GHz;
the Rb satisfies: rb is more than or equal to 3.33Gbps and less than or equal to 10.1 Gbps.
According to some embodiments of the invention, the frequency of the Ku band signal is 14.05 GHz.
As shown in fig. 4, in a fourth aspect, an embodiment of the present invention further provides a wireless transmission apparatus 200 for a Ku-band signal, including:
a receive signal rf front-end module 210, configured to receive a Ku band signal;
a received signal intermediate frequency conversion module 220, communicatively connected to the received signal radio frequency front end module 210, where the received signal intermediate frequency conversion module 220 is configured to down-convert the Ku band signal to a low intermediate frequency signal with a center frequency of f, a bandwidth of W, and a transmission rate of Rb, where f satisfies: f is more than 1GHz and less than 2GHz, and W satisfies the following conditions: 1.5GHz < W < 3GHz, wherein Rb satisfies: 3Gbps < Rb < 10.5 Gbps;
a received signal processing module 230, communicatively connected to the received signal intermediate frequency conversion module 220, where the received signal processing module 230 is configured to perform a second preprocessing on the low intermediate frequency signal to obtain service data.
By adopting the embodiment of the invention, high-speed and long-distance transmission can be realized in a complex environment, the system structure is simple, and the dependence on a fixed communication infrastructure is not required.
On the basis of the above-described embodiment, various modified embodiments are further proposed, and it is to be noted herein that, in order to make the description brief, only the differences from the above-described embodiment are described in the various modified embodiments.
As shown in fig. 7, according to some embodiments of the invention, the received signal processing module 230 includes:
receiving a signal VGA for executing energy gain control processing on the low-intermediate frequency signal;
the receiving signal A/D is in communication connection with the receiving signal VGA and is used for performing A/D processing on the low-intermediate frequency signal after the energy gain control processing is performed so as to obtain a synthetic signal;
and the received signal FPGA is in A/D communication connection with the received signal, and is used for carrying out carrier separation on the synthesized signal so as to obtain N paths of frequency conversion data, respectively executing down-conversion processing on the N paths of frequency conversion data by adopting an N paths of parallel processing mode so as to obtain a modulated signal, and demodulating the modulated signal.
Further, as shown in fig. 7, the receiving signal FPGA includes:
receiving signal synchronous detection, which is used for detecting and synchronizing the modulation signal by adopting a training sequence self-correlation algorithm, and carrying out channel estimation and channel equalization processing;
an FFT for performing OFDM demodulation on the modulated signal after signal estimation and channel equalization processing;
a demodulator communicatively coupled to the FFT, the demodulator configured to perform QPSK demodulation, or 16QAM demodulation, or 64QAM demodulation on the demodulated signal after the OFDM demodulation is performed;
a decoder in communication with the demodulator, the decoder configured to perform RS decoding on the demodulated signal after performing QPSK demodulation, or 16QAM demodulation, or 64QAM demodulation.
According to some embodiments of the invention, the f satisfies: f is 1.536 GHz;
the W satisfies: w ═ 2.16 GHz;
the Rb satisfies: rb is more than or equal to 3.33Gbps and less than or equal to 10.1 Gbps.
According to some embodiments of the invention, the frequency of the Ku band signal is 14.05 GHz.
A radio transmission apparatus of a Ku-band signal according to an embodiment of the present invention is described in detail in a specific embodiment with reference to fig. 5 to 7. It is to be understood that the following description is illustrative only and is not intended to be in any way limiting. All similar structures and similar variations thereof adopted by the invention are intended to fall within the scope of the invention.
In order to solve the problem that high-speed data transmission capacity is difficult to obtain in a complex environment without an optical fiber network in the prior art, the embodiment of the invention considers wireless communication, which is a communication mode for exchanging information among multiple nodes by utilizing the characteristic that electromagnetic waves propagate in a free space, does not need to establish a physical link, does not need to lay an optical cable by a large amount of manpower, and has strong flexibility and expansibility.
Wireless communication includes satellite communication and free space optical communication, but both communication methods have certain limitations. Satellite communication can provide long-range data transmission services, but the transmission rate is not as demanding. The free space optical communication technology can provide optical fiber level transmission capability, but the transmission cannot be transmitted through cloud layers, and the working frequency band of a wireless system cannot ensure the real-time availability of a communication network. Neither satellite communication nor free-space optical communication can achieve transmission that provides fiber equivalent capability in any area.
Further considering that wireless communication systems are increasingly congested as low-band spectrum resources are continuously utilized, it is a great trend to seek new spectrum resources to meet the high-speed transmission requirements. The demand of people for communication quality and communication capacity in the big data era has driven wireless communication to extend from the L, S, C frequency band to the X, Ku frequency band, even the millimeter wave frequency band, and a wider bandwidth is obtained by increasing the working frequency, which is the most basic and effective way for expanding the communication capacity. The development of high frequency device chips and high speed digital processors has led to the emergence of a variety of high frequency wireless transmission systems. In the related technology, the working bandwidth of the Ku band integrated radio frequency transceiving system is 2.5GHz, and only the 40MHz signal bandwidth with adjustable center frequency is supported, so that the transmission rate is greatly limited. Meanwhile, the system has huge data processing amount under high-rate transmission, so that low complexity of the system and high real-time performance of data processing are difficult to realize at the same time.
Aiming at the urgent requirements of military and civil communication on large-capacity remote transmission and the problems of limited transmission capacity of the working frequency band, lack of spectrum resources and the like of the existing communication device, the embodiment of the invention provides a wireless transmission method and a wireless transmission device of Ku waveband signals, which integrate a high-order modulation and demodulation technology and a low-complexity high-performance channel coding technology, adopt an expandable high-performance computing and processing architecture and realize high-speed real-time exchange processing of information by system integration under the condition of resource limitation.
As shown in fig. 5, the wireless transmission apparatus of a Ku-band signal according to an embodiment of the present invention includes a transmitter and a receiver.
The transmitter comprises a transmitting signal processing module, a transmitting signal intermediate frequency conversion module and a transmitting signal radio frequency front end module.
The transmitting signal processing module is used for carrying out first preprocessing on the service data to obtain low and intermediate frequency signals with the center frequency of 1.536GHz, the bandwidth of 2.16GHz and the transmission rate within the range of [3.33Gbps and 10.1Gbps ]. The transmitting signal intermediate frequency conversion module is in communication connection with the transmitting signal processing module and is used for up-converting the low intermediate frequency signal to a Ku waveband signal with the frequency of 14.05 GHz. And the transmitting signal radio frequency front-end module is in communication connection with the transmitting signal intermediate frequency conversion module and is used for transmitting a Ku waveband signal.
As shown in fig. 6, the transmission signal processing module includes a transmission signal FPGA, a transmission signal D/a, and a transmission signal VGA. The transmission signal FPGA is used for modulating service data to obtain a modulation signal, performing up-conversion processing on the modulation signal respectively in an N-path parallel processing mode to obtain 4 paths of frequency conversion data, and synthesizing the 4 paths of frequency conversion data by adopting a carrier aggregation technology to obtain a synthesized signal. And the transmitting signal D/A is in communication connection with the transmitting signal FPGA and is used for performing D/A processing on the synthesized signal. The emission signal VGA is in communication connection with the emission signal D/A, and is used for executing energy gain control processing on the synthesized signal after the D/A processing is executed.
As shown in fig. 6, the transmission signal FPGA includes an encoder, a modulator, and IFFT. The encoder is used for performing RS encoding on the service data. The modulator is connected with the encoder in communication mode, and the modulator is used for carrying out QPSK modulation, 16QAM modulation or 64QAM modulation on the service data after RS encoding is carried out. The IFFT is communicatively connected to the modulator, and is configured to perform OFDM modulation on traffic data that has been QPSK modulated, or 16QAM modulated, or 64QAM modulated.
The transmitter of the embodiment of the invention adopts OFDM modulation, RS coding, QPSK/16QAM/64QAM, obtains a low-intermediate frequency signal with the center frequency of 1.536GHz and the effective signal bandwidth of 2.16GHz through the transmitting signal processing module, has selectable modulation format QPSK/16QAM/64QAM, and can realize the adjustability of the transmission rate of 3.33Gbps-10.1Gbps by selecting different modulation formats, and the specific parameter design is shown in Table 1.
Table 1 design parameters of wireless transmission device for Ku band signals
The transmitting signal intermediate frequency conversion module mainly performs a secondary up-conversion function to up-convert the low intermediate frequency signal to a Ku wave band. The transmitting signal radio frequency front end module mainly comprises a front end amplifier and an antenna and is used for transmitting signals.
As shown in fig. 5, the receiver includes: the device comprises a received signal radio frequency front end module, a received signal intermediate frequency conversion module and a received signal processing module. The receiving signal radio frequency front end module is used for receiving Ku waveband signals with the frequency of 14.05 GHz. The receiving signal intermediate frequency conversion module is in communication connection with the receiving signal radio frequency front end module, and is used for down-converting Ku waveband signals to low and intermediate frequency signals with the center frequency of 1.536GHz, the bandwidth of 2.16GHz and the transmission rate within the range of [3.33Gbps and 10.1Gbps ]. The receiving signal processing module is in communication connection with the receiving signal intermediate frequency conversion module, and the receiving signal processing module is used for performing second preprocessing on the low intermediate frequency signal to obtain service data.
As shown in fig. 7, the received signal processing module includes: receiving signal VGA, receiving signal A/D, receiving signal FPGA. The received signal VGA is used to perform energy gain control processing on the low-if signal. And the received signal A/D is in communication connection with the received signal VGA and is used for performing A/D processing on the low-intermediate frequency signal after the energy gain control processing is performed so as to obtain a synthesized signal. The receiving signal FPGA is in communication connection with the receiving signal A/D, the receiving signal FPGA is used for carrying out carrier separation on the synthesized signal to obtain 4 paths of frequency conversion data, the 4 paths of frequency conversion data are respectively subjected to down-conversion processing in a 4-path parallel processing mode to obtain a modulation signal, and the modulation signal is demodulated.
The receiving signal FPGA comprises: the method comprises the steps of receiving signal synchronization detection, FFT, a demodulator and a decoder. The received signal synchronous detection is used for detecting and synchronizing the modulated signal by adopting a training sequence autocorrelation algorithm, and carrying out channel estimation and channel equalization processing. The FFT is used to perform OFDM demodulation on the modulated signal after signal estimation and channel equalization processing. A demodulator is communicatively connected to the FFT, the demodulator being configured to perform QPSK demodulation, or 16QAM demodulation, or 64QAM demodulation on the demodulated signal after the OFDM demodulation is performed. The decoder is communicatively connected to the demodulator, and the decoder is configured to perform RS decoding on the demodulated signal after performing QPSK demodulation, or 16QAM demodulation, or 64QAM demodulation.
In the embodiment of the invention, in order to realize the highest transmission rate of 10.1Gbp, a low-complexity parallel processing architecture is adopted, and 4 bandwidths of 540MHz are synthesized into an ultra-wideband signal of 2.16GHz by a carrier aggregation technology. The service data is firstly processed by FPGA to complete signal frame formation, constellation mapping, error correction coding, baseband forming, carrier aggregation, digital up/down conversion and other digital signals with the central frequency f1 of 1.536GHz and the bandwidth of 2.16GHz, then the digital signals are converted into low-intermediate frequency analog or digital signals by D/A or A/D, and finally the low-intermediate frequency analog or digital signals are input or output by an energy gain control module.
Through laboratory environment tests and external field tests, the Ku-band signal wireless transmission device provided by the embodiment of the invention can realize real-time transmission and processing functions of ultra-wideband high-speed data. The device realizes 8.4 km transmission demonstration of 10.1Gbps transmission rate in a complex urban environment. The device can perform rate adaptation in the range of 3.3Gbps to 10.1Gbps (see Table 2), the maximum spectrum efficiency is 5bps/Hz, and the data transmission rate of various dynamically-changed channels is improved to the maximum extent. A number of experiments have shown that 1 erroneous bit is received for every 100 tens of thousands of bits transmitted.
Table 2 performance of wireless transmission device for Ku band signals
By adopting the embodiment of the invention, through a parallel signal processing architecture, ultra-wideband high-capacity wireless transmission with the highest peak transmission rate of 10.1Gbps is realized, and the backbone transmission capacity of the equivalent optical fiber is realized; through a carrier aggregation technology, 4 paths of 540MHz signals are converted into 2.16GHz ultra-wideband signals through digital up-down conversion, so that the transmission capacity of the system is greatly increased; through an energy gain control technology, the size of the gain of the analog front end is controlled by calculating the energy of the digital sampling signal, so that the input of the A/D sampling chip is ensured to be in an optimal working range; the detection and synchronization of frame signals are realized through the algorithm of training sequence self-correlation according to whether the correlation result exceeds a judgment threshold, and the out-of-step probability can be effectively reduced through setting a reasonable detection threshold; the rate adaptation of the dynamically changing channel is carried out by a rate adaptive adjustment method, the modulation mode is dynamically changed according to different channel characteristics, the environment change is adapted by different transmission rates, and the real-time performance and the reliability of transmission are guaranteed to the maximum extent.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, and those skilled in the art can make various modifications and changes. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Although some embodiments described herein include some features included in other embodiments instead of others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. The particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. For example, in the claims, any of the claimed embodiments may be used in any combination.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (15)
1. A method for wireless transmission of a Ku-band signal, comprising:
performing first preprocessing on service data to obtain a low-intermediate frequency signal with a center frequency of f, a bandwidth of W and a transmission rate of Rb, wherein f satisfies: f is more than 1GHz and less than 2GHz, and W satisfies the following conditions: 1.5GHz < W < 3GHz, wherein Rb satisfies: 3Gbps < Rb < 10.5 Gbps;
up-converting the low intermediate frequency signal to a Ku waveband signal;
and transmitting the Ku waveband signal.
2. The method according to claim 1, wherein the first preprocessing of the traffic data comprises:
modulating the service data to obtain a modulation signal;
respectively executing up-conversion processing on the modulation signals by adopting an N-path parallel processing mode to obtain N-path frequency conversion data;
synthesizing the N paths of frequency conversion data by adopting a carrier aggregation technology to obtain a synthesized signal;
and sequentially performing D/A processing and energy gain control processing on the synthesized signal.
3. The method of claim 2, wherein the modulating the traffic data comprises:
performing RS encoding on the service data;
performing QPSK modulation, or 16QAM modulation, or 64QAM modulation on the service data subjected to RS coding;
OFDM modulation is performed on traffic data on which QPSK modulation, or 16QAM modulation, or 64QAM modulation is performed.
4. The method according to claim 1, wherein f satisfies: f is 1.536 GHz;
the W satisfies: w ═ 2.16 GHz;
the Rb satisfies: rb is more than or equal to 3.33Gbps and less than or equal to 10.1 Gbps.
5. The method according to claim 1, wherein the frequency of the Ku band signal is 14.05 GHz.
6. A method for wireless transmission of a Ku-band signal, comprising:
receiving a Ku waveband signal;
down-converting the Ku waveband signal to a low-intermediate frequency signal with a center frequency of f, a bandwidth of W and a transmission rate of Rb, wherein f satisfies the following conditions: f is more than 1GHz and less than 2GHz, and W satisfies the following conditions: 1.5GHz < W < 3GHz, wherein Rb satisfies: 3Gbps < Rb < 10.5 Gbps;
and carrying out second preprocessing on the low-intermediate frequency signal to obtain service data.
7. The method according to claim 6, wherein the second preprocessing of the low-IF signal comprises:
sequentially performing energy gain control processing and A/D processing on the low and intermediate frequency signals to obtain a synthesized signal;
carrying out carrier separation on the synthesized signal to obtain N paths of frequency conversion data;
performing down-conversion processing on the N paths of frequency conversion data respectively by adopting an N-path parallel processing mode to obtain modulation signals;
and demodulating the modulated signal.
8. The method according to claim 7, wherein the demodulating the modulated signal includes:
detecting and synchronizing the modulation signal by adopting a training sequence self-correlation algorithm, and performing channel estimation and channel equalization processing;
performing OFDM demodulation on the modulated signal subjected to signal estimation and channel equalization;
performing QPSK demodulation, or 16QAM demodulation, or 64QAM demodulation on the modulated signal on which the OFDM demodulation is performed;
RS decoding is performed on the modulated signal on which QPSK demodulation, or 16QAM demodulation, or 64QAM demodulation is performed.
9. The method of wirelessly transmitting a Ku-band signal according to claim 8, further comprising:
and the rate adaptation of the dynamically changed channel is carried out by adopting a rate adaptive adjustment method, and QPSK demodulation, 16QAM demodulation or 64QAM demodulation is dynamically selected according to different channel characteristics.
10. A wireless transmission apparatus for Ku band signals, comprising:
a transmission signal processing module, configured to perform first preprocessing on service data to obtain a low-intermediate frequency signal with a center frequency of f, a bandwidth of W, and a transmission rate of Rb, where f satisfies: f is more than 1GHz and less than 2GHz, and W satisfies the following conditions: 1.5GHz < W < 3GHz, wherein Rb satisfies: 3Gbps < Rb < 10.5 Gbps;
the transmitting signal intermediate frequency conversion module is in communication connection with the transmitting signal processing module and is used for up-converting the low intermediate frequency signal to a Ku waveband signal;
and the transmitting signal radio frequency front end module is in communication connection with the transmitting signal intermediate frequency conversion module and is used for transmitting the Ku waveband signal.
11. The apparatus for wireless transmission of Ku-band signals according to claim 10, wherein the transmit signal processing module comprises:
the transmission signal FPGA is used for modulating the service data to obtain a modulation signal, respectively executing up-conversion processing on the modulation signal by adopting an N-path parallel processing mode to obtain N-path frequency conversion data, and synthesizing the N-path frequency conversion data by adopting a carrier aggregation technology to obtain a synthesized signal;
the transmitting signal D/A is in communication connection with the transmitting signal FPGA and is used for performing D/A processing on the synthesized signal;
and the emission signal VGA is in communication connection with the emission signal D/A, and is used for executing energy gain control processing on the synthesized signal after the D/A processing is executed.
12. The method according to claim 11, wherein the transmitting signal FPGA comprises:
an encoder for performing RS encoding on the service data;
the modulator is in communication connection with the encoder and is used for executing QPSK modulation, 16QAM modulation or 64QAM modulation on the service data after RS encoding is executed;
and the IFFT is in communication connection with the modulator and is used for carrying out OFDM modulation on the service data after QPSK modulation, 16QAM modulation or 64QAM modulation is carried out.
13. A wireless transmission apparatus for Ku band signals, comprising:
the receiving signal radio frequency front-end module is used for receiving a Ku waveband signal;
a receiving signal intermediate frequency conversion module, communicatively connected to the receiving signal radio frequency front end module, where the receiving signal intermediate frequency conversion module is configured to down-convert the Ku band signal to a low intermediate frequency signal with a center frequency of f, a bandwidth of W, and a transmission rate of Rb, where f satisfies: f is more than 1GHz and less than 2GHz, and W satisfies the following conditions: 1.5GHz < W < 3GHz, wherein Rb satisfies: 3Gbps < Rb < 10.5 Gbps;
and the received signal processing module is in communication connection with the received signal intermediate frequency conversion module and is used for performing second preprocessing on the low intermediate frequency signal so as to obtain service data.
14. The method according to claim 13, wherein the received signal processing module includes:
receiving a signal VGA for executing energy gain control processing on the low-intermediate frequency signal;
the receiving signal A/D is in communication connection with the receiving signal VGA and is used for performing A/D processing on the low-intermediate frequency signal after the energy gain control processing is performed so as to obtain a synthetic signal;
and the received signal FPGA is in A/D communication connection with the received signal, and is used for carrying out carrier separation on the synthesized signal so as to obtain N paths of frequency conversion data, respectively executing down-conversion processing on the N paths of frequency conversion data by adopting an N paths of parallel processing mode so as to obtain a modulated signal, and demodulating the modulated signal.
15. The method according to claim 14, wherein the receiving signal FPGA comprises:
receiving signal synchronous detection, which is used for detecting and synchronizing the modulation signal by adopting a training sequence self-correlation algorithm, and carrying out channel estimation and channel equalization processing;
an FFT for performing OFDM demodulation on the modulated signal after signal estimation and channel equalization processing;
a demodulator communicatively coupled to the FFT, the demodulator configured to perform QPSK demodulation, or 16QAM demodulation, or 64QAM demodulation on the demodulated signal after the OFDM demodulation is performed;
a decoder in communication with the demodulator, the decoder configured to perform RS decoding on the demodulated signal after performing QPSK demodulation, or 16QAM demodulation, or 64QAM demodulation.
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