CN109818633B - Signal transmitting method and device based on SCPC array and symbol space synthesis - Google Patents
Signal transmitting method and device based on SCPC array and symbol space synthesis Download PDFInfo
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Abstract
The embodiment of the invention provides a signal transmitting method and a signal transmitting device based on an SCPC array and symbol space synthesis, wherein the method comprises the following steps: carrying out serial-parallel conversion on information to be transmitted to generate a plurality of paths of parallel code streams; respectively modulating a plurality of orthogonal subcarriers by utilizing a plurality of paths of parallel code streams to generate a plurality of paths of modulated subcarriers; the multiple antenna units are used for respectively radiating the multiple modulated subcarriers to the space, and each antenna unit radiates one modulated subcarrier, so that a full-wave orthogonal frequency division multiplexing OFDM symbol containing all subcarrier information in an antenna radiation area is formed. The embodiment of the invention provides a signal transmitting method and a signal transmitting device based on SCPC array and symbol space synthesis, wherein each modulated subcarrier in a transmitter is processed by one transmitting channel of a transmitting array, and OFDM symbols are synthesized in space, so that the transmitter has the advantages of lowest power consumption and minimum heat dissipation amount required by reaching the same transmitting power level, and is correspondingly most convenient to debug and maintain.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a signal transmitting method and device based on SCPC array and symbol space synthesis.
Background
The demand of modern society for communication is explosively increasing, and in order to realize maximum capacity information transmission in limited spectrum resources, an Orthogonal Frequency Division Multiplexing technology is developed in the industry, a high-speed information stream to be transmitted is decomposed into N low-speed code streams, and N mutually Orthogonal subcarriers are respectively modulated to form so-called Orthogonal Frequency Division Multiplexing (OFDM) symbols to be transmitted to a destination. Different from the previous single carrier modulation mode, the OFDM symbol includes a plurality of equally spaced subcarriers, each subcarrier independently carries information to be transmitted, the frequency spectrums formed by modulating the subcarriers are mutually overlapped, and a receiving end separates and extracts the carried information by virtue of the orthogonality thereof, thereby realizing the communication function. Therefore, the communication signal system is suitable for large-capacity information transmission and saves frequency spectrum resources.
Fig. 1 is a schematic diagram of an OFDM symbol generation method in the prior art, and as shown in fig. 1, the core part of the OFDM symbol generation method is an IFFT module, that is, an OFDM symbol is generated by using a real-time mathematical calculation method, and then a DA conversion is performed to obtain a full-wave OFDM signal including all modulated subcarriers for transmission.
However, the full-wave OFDM symbol directly obtained by this method contains a plurality of carrier components, so a transmitter for transmitting such full-wave OFDM signal must strictly ensure linearity during processing such as frequency conversion and amplification, and avoid signal distortion caused by nonlinear products generated by inter-modulation between subcarriers, and usually needs to implement more power back-off or linear compensation measures for a non-stage power amplifier, which results in low power efficiency of such transmitter, large power consumption and heat dissipation pressure, or complex configuration, and difficult equipment debugging and maintenance.
Disclosure of Invention
It is an object of embodiments of the present invention to provide a signal transmission method and apparatus based on SCPC array and symbol space synthesis that overcomes or at least partially solves the above mentioned problems.
In order to solve the above technical problem, in one aspect, an embodiment of the present invention provides a signal transmitting method based on a single-channel single-carrier SCPC array and symbol space synthesis, including:
carrying out serial-parallel conversion on information to be transmitted to generate a plurality of paths of parallel code streams;
modulating a plurality of orthogonal subcarriers by utilizing the multi-path parallel code streams respectively to generate a plurality of paths of modulated subcarriers;
and respectively radiating the multiple modulated subcarriers to space by using a plurality of antenna units, wherein each antenna unit radiates one modulated subcarrier, so that a full-wave Orthogonal Frequency Division Multiplexing (OFDM) symbol containing all subcarrier information is contained in an antenna radiation area.
In another aspect, an embodiment of the present invention provides a signal transmitting apparatus based on a single-channel single-carrier SCPC array and symbol space synthesis, including:
the serial-parallel conversion module is used for performing serial-parallel conversion on information to be transmitted to generate a plurality of paths of parallel code streams;
the subcarrier modulation array module is used for modulating a plurality of orthogonal subcarriers by utilizing the multipath parallel code streams respectively to generate multipath modulated subcarriers;
and the active antenna transmitting array module is used for respectively radiating the multiple modulated subcarriers to space by using a plurality of antenna units, and each antenna unit radiates one modulated subcarrier so that a full-wave Orthogonal Frequency Division Multiplexing (OFDM) symbol containing all subcarrier information is contained in an antenna radiation area.
In another aspect, an embodiment of the present invention provides an electronic device, including:
the processor and the memory are communicated with each other through a bus; the memory stores program instructions executable by the processor, which when called by the processor are capable of performing the methods described above.
In yet another aspect, the present invention provides a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the above-mentioned method.
The embodiment of the invention provides a signal transmitting method and a signal transmitting device based on SCPC array and symbol space synthesis, full-wave signals containing all modulated subcarriers do not exist at any position in a transmitter, a single modulated subcarrier is used instead, each modulated subcarrier is processed by one transmitting channel of a transmitting array and radiated to space by one antenna unit in an array antenna, and OFDM symbols are synthesized in space. The transmitter can adopt a saturated power amplifier with extremely high power supply efficiency without worrying about the linearity, the power supply required by reaching the same transmitting power level has the lowest power consumption and the minimum heat dissipation capacity, and the corresponding debugging and maintenance are also simplest and most convenient.
Drawings
FIG. 1 is a diagram illustrating an OFDM symbol generation method in the prior art;
fig. 2 is a schematic diagram of a signal transmission method based on SCPC array and symbol space synthesis according to an embodiment of the present invention;
fig. 3 is a schematic block diagram of a signal transmitting apparatus based on SCPC array and symbol space synthesis according to an embodiment of the present invention;
fig. 4 is a schematic block diagram of a subcarrier modulation array module according to an embodiment of the present invention;
fig. 5 is a schematic block diagram of an active antenna transmit array module according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating an operating principle of a signal transmitting apparatus based on SCPC array and symbol space synthesis according to an embodiment of the present invention;
fig. 7 is a schematic block diagram of serial-to-parallel conversion and pilot insertion provided in an embodiment of the present invention;
fig. 8 is a schematic block diagram of an up-conversion array according to an embodiment of the present invention;
FIG. 9 is a functional block diagram illustrating insertion of an OFDM cyclic suffix according to an embodiment of the present invention;
FIG. 10 is a timing diagram for insertion of an OFDM cyclic suffix provided by an embodiment of the present invention;
fig. 11 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 2 is a schematic diagram of a signal transmission method based on SCPC array and symbol space synthesis according to an embodiment of the present invention, and as shown in fig. 2, an embodiment of the present invention provides a signal transmission method based on SCPC array and symbol space synthesis, an implementation main body of the signal transmission method is a signal transmission device based on SCPC array and symbol space synthesis, hereinafter referred to as a signal transmission device, and the signal transmission device may work alone as a machine or may be a part of a transmitter, and the method includes:
step S201, carrying out serial-parallel conversion on information to be sent to generate a plurality of paths of parallel code streams;
step S202, a plurality of orthogonal subcarriers are respectively modulated by utilizing the multi-channel parallel code streams to generate a plurality of channels of modulated subcarriers;
step S203, using multiple antenna units to respectively radiate the multiple modulated subcarriers to space, where each antenna unit radiates one modulated subcarrier, so that a full-wave orthogonal frequency division multiplexing OFDM symbol including all subcarrier information is included in an antenna radiation region.
Specifically, fig. 3 is a schematic block diagram of a signal transmitting apparatus based on SCPC array and symbol space synthesis according to an embodiment of the present invention, and as shown in fig. 3, the signal transmitting apparatus based on Single Carrier Per Channel (SCPC) and OFDM symbol space synthesis technology, SCPC _ OFDM _ TRANS for short, employs an array type multi-Channel transmitter, and each transmitting Channel only processes one subcarrier signal, so that the signal transmitting apparatus is called a Single-Channel Single Carrier. The output of each transmitting channel stimulates one antenna array element, and the spatial radiation of all the antenna array elements are mutually superposed in a far field to form a complete OFDM symbol, thereby realizing single-channel single-carrier array transmission and OFDM symbol spatial synthesis.
When the signal is transmitted, firstly, the information to be transmitted is subjected to serial-parallel conversion through the serial-parallel conversion module, and a plurality of paths of parallel code streams are generated.
Then, a plurality of orthogonal subcarriers are respectively modulated by utilizing a plurality of paths of parallel code streams through a subcarrier modulation array module to generate a plurality of paths of modulated subcarriers.
And finally, the active antenna transmitting array module utilizes a plurality of antenna units to respectively radiate a plurality of paths of modulated subcarriers to the space, and each antenna unit radiates one path of modulated subcarriers, so that a full-wave OFDM symbol containing all subcarrier information is contained in an antenna radiation area.
The significant feature of the transmission process is that the OFDM symbols are spatially combined by the radiation of multiple antenna elements. Each antenna unit only radiates one subcarrier to the space, namely, any antenna unit only transmits partial OFDM symbols, and the aggregate of the radiation energy of all the antenna units forms a complete full-wave OFDM symbol.
Since a multi-channel transmitter is employed and each transmit channel processes only one subcarrier signal, there is no full-wave OFDM symbol inside the transmitter and thus a severe limitation on the linearity of the transmit channels is avoided. The transmitter does not need to distribute power internally to the signal to be transmitted (i.e., the full-wave OFDM signal described above), and each antenna element in the transmit antenna array is excited by a separate modulated subcarrier.
Fig. 4 is a schematic block diagram of a subcarrier modulation array module according to an embodiment of the present invention, as shown in fig. 4, the embodiment of the present invention employs a subcarrier modulation array to replace a single modulator in a general transmitting system, the subcarrier modulation array module is composed of a reference clock source, N phase-locked frequency synthesizers, and N subcarrier modulators, each subcarrier modulator receives one of N parallel code streams as a modulation code, the subcarrier modulation format may be PSK, QAM, or any other format, the N modulated subcarriers are not combined, are respectively and independently output, and excite a corresponding channel of an active antenna transmitting array.
Fig. 5 is a schematic block diagram of an active antenna transmit array module according to an embodiment of the present invention, and as shown in fig. 5, the active antenna transmit array radiates radio signals to a space to form a full-wave OFDM signal including all modulated subcarriers with a desired power level in a required spatial range, so as to be received by a communication receiving end and used for information extraction processing. Different from the existing active phased array transmission system, the active antenna array adopted by the embodiment of the invention is provided with N input ports, each port inputs one modulated subcarrier, each channel in the array only amplifies one modulated subcarrier, and each antenna unit only radiates one modulated subcarrier. The array need not contain components such as transmit signal power distribution networks, phase shifters, etc. that are necessary for conventional phased array systems.
The embodiment of the invention provides a signal transmitting method based on SCPC array and symbol space synthesis, full-wave signals containing all modulated subcarriers do not exist at any position inside a transmitter, a single modulated subcarrier is used instead, each modulated subcarrier is processed by one transmitting channel of a transmitting array and radiated to space by one antenna unit in an array antenna, and OFDM symbols are synthesized in space. The transmitter can adopt a saturated power amplifier with extremely high power supply efficiency without worrying about the linearity, the power supply required by reaching the same transmitting power level has the lowest power consumption and the minimum heat dissipation capacity, and the corresponding debugging and maintenance are also simplest and most convenient.
On the basis of the foregoing embodiment, further, the performing serial-to-parallel conversion on the information to be transmitted to generate a plurality of parallel code streams specifically includes:
and performing serial-parallel conversion on information to be transmitted, inserting a pilot code, and generating a plurality of paths of parallel code streams.
Specifically, fig. 6 is a schematic diagram of an operating principle of a signal transmitting apparatus based on SCPC array and symbol space synthesis according to an embodiment of the present invention, as shown in fig. 6, in a process of performing serial-to-parallel conversion on information to be transmitted to generate a multi-path parallel code stream, an information bit stream to be transmitted is first converted into an N-bit parallel code stream, and forms N-path parallel transmission code streams with an m-bit pilot code, where the N-path transmission code streams respectively modulate N orthogonal subcarriers, modulated subcarriers are not synthesized and are independently amplified, and then respectively excite N antenna units to radiate to space, so as to obtain a full-wave OFDM symbol including information of all subcarriers in an antenna radiation region. The receiving device of the correspondent node can adopt a conventional OFDM receiver to receive and demodulate information.
Fig. 7 is a schematic block diagram of serial-to-parallel conversion and pilot insertion provided in the embodiment of the present invention, as shown in fig. 7, similar to the existing OFDM transmitter, which is used to implement serial-to-parallel conversion and pilot insertion for an information stream to be transmitted, but different from the existing OFDM transmitter, the embodiment of the present invention is insensitive to the position of a parallel code stream for pilot insertion, because pilot subcarriers can be arbitrarily set in a subcarrier modulation array as needed.
The embodiment of the invention provides a signal transmitting method based on SCPC array and symbol space synthesis, full-wave signals containing all modulated subcarriers do not exist at any position inside a transmitter, a single modulated subcarrier is used instead, each modulated subcarrier is processed by one transmitting channel of a transmitting array and radiated to space by one antenna unit in an array antenna, and OFDM symbols are synthesized in space. The transmitter can adopt a saturated power amplifier with extremely high power supply efficiency without worrying about the linearity, the power supply required by reaching the same transmitting power level has the lowest power consumption and the minimum heat dissipation capacity, and the corresponding debugging and maintenance are also simplest and most convenient.
On the basis of the foregoing embodiments, further before the using a plurality of antenna units to respectively radiate the multiple modulated subcarriers to the space, the method further includes:
and performing frequency conversion on each path of modulated subcarriers.
Specifically, the signal transmitting apparatus further includes a frequency conversion module, and frequency-converts each of the plurality of modulated subcarriers by the frequency conversion module before the plurality of antenna units respectively radiate the plurality of modulated subcarriers to the space.
The embodiment of the invention adopts a subcarrier modulation array to replace a single modulator in a general transmitting system, a subcarrier modulation array module consists of a reference clock source, N phase-locked frequency synthesizers and N subcarrier modulators, each subcarrier modulator receives one of N paths of parallel code streams as a modulation code, the subcarrier modulation system can be PSK, QAM or any other system, the N paths of modulated subcarriers are not combined and are respectively and independently output, and corresponding channels of an active antenna transmitting array are excited.
Fig. 8 is a schematic block diagram of an up-conversion array according to an embodiment of the present invention, as shown in fig. 8, when the up-conversion array is applied to a transmission system with a very high frequency band, N modulated subcarriers may be subjected to up-conversion processing first, so as to shift N subcarrier frequencies to a desired operating frequency band.
The embodiment of the invention provides a signal transmitting method based on SCPC array and symbol space synthesis, full-wave signals containing all modulated subcarriers do not exist at any position inside a transmitter, a single modulated subcarrier is used instead, each modulated subcarrier is processed by one transmitting channel of a transmitting array and radiated to space by one antenna unit in an array antenna, and OFDM symbols are synthesized in space. The transmitter can adopt a saturated power amplifier with extremely high power supply efficiency without worrying about the linearity, the power supply required by reaching the same transmitting power level has the lowest power consumption and the minimum heat dissipation capacity, and the corresponding debugging and maintenance are also simplest and most convenient.
Based on the above embodiments, further, the cyclic prefix of the OFDM symbol is formed by controlling and extending the transmission duration of each modulated subcarrier.
Specifically, fig. 3 is a schematic block diagram of a signal transmitting apparatus based on SCPC array and symbol space synthesis according to an embodiment of the present invention, and as shown in fig. 3, the signal transmitting apparatus further includes a symbol timing module, and a cyclic prefix is an important technical means for OFDM modulation waveform to combat multipath interference.
In addition, a cyclic suffix needs to be added, fig. 9 is a schematic block diagram of OFDM cyclic suffix insertion provided by the embodiment of the invention, and fig. 10 is a timing diagram of OFDM cyclic suffix insertion provided by the embodiment of the invention.
The embodiment of the invention provides a signal transmitting method based on SCPC array and symbol space synthesis, full-wave signals containing all modulated subcarriers do not exist at any position inside a transmitter, a single modulated subcarrier is used instead, each modulated subcarrier is processed by one transmitting channel of a transmitting array and radiated to space by one antenna unit in an array antenna, and OFDM symbols are synthesized in space. The transmitter can adopt a saturated power amplifier with extremely high power supply efficiency without worrying about the linearity, the power supply required by reaching the same transmitting power level has the lowest power consumption and the minimum heat dissipation capacity, and the corresponding debugging and maintenance are also simplest and most convenient.
Fig. 3 is a schematic block diagram of a signal transmitting apparatus based on SCPC array and symbol space synthesis according to an embodiment of the present invention, and as shown in fig. 3, the embodiment of the present invention provides a signal transmitting apparatus based on SCPC array and symbol space synthesis, which is configured to perform the method described in any of the above embodiments, and specifically includes a serial-to-parallel conversion module, a subcarrier modulation array module, and an active antenna transmit array module, where:
the serial-parallel conversion module is used for performing serial-parallel conversion on information to be transmitted to generate a plurality of paths of parallel code streams; the subcarrier modulation array module is used for modulating a plurality of orthogonal subcarriers by utilizing the multipath parallel code streams respectively to generate multipath modulated subcarriers; and the active antenna transmitting array module is used for respectively radiating the multiple modulated subcarriers to space by using a plurality of antenna units, and each antenna unit radiates one modulated subcarrier so that a full-wave Orthogonal Frequency Division Multiplexing (OFDM) symbol containing all subcarrier information is contained in an antenna radiation area.
Specifically, the technology is based on Single Carrier Per Channel (SCPC) array transmission and OFDM symbol space synthesis, SCPC _ OFDM _ TRANS for short, and the technology adopts an array type multi-Channel transmitter, and each transmission Channel only processes one subcarrier signal, so the technology is called Single Carrier. The output of each transmitting channel stimulates one antenna array element, and the spatial radiation of all the antenna array elements are mutually superposed in a far field to form a complete OFDM symbol, thereby realizing single-channel single-carrier array transmission and OFDM symbol spatial synthesis.
When the signal is transmitted, firstly, the information to be transmitted is subjected to serial-parallel conversion through the serial-parallel conversion module, and a plurality of paths of parallel code streams are generated.
Then, a plurality of orthogonal subcarriers are respectively modulated by utilizing a plurality of paths of parallel code streams through a subcarrier modulation array module to generate a plurality of paths of modulated subcarriers.
And finally, the active antenna transmitting array module utilizes a plurality of antenna units to respectively radiate a plurality of paths of modulated subcarriers to the space, and each antenna unit radiates one path of modulated subcarriers, so that a full-wave OFDM symbol containing all subcarrier information is contained in an antenna radiation area.
The significant feature of the transmission process is that the OFDM symbols are spatially combined by the radiation of multiple antenna elements. Each antenna unit only radiates one subcarrier to the space, namely, any antenna unit only transmits partial OFDM symbols, and the aggregate of the radiation energy of all the antenna units forms a complete full-wave OFDM symbol.
Since a multi-channel transmitter is employed and each transmit channel processes only one subcarrier signal, there is no full-wave OFDM symbol inside the transmitter and thus a severe limitation on the linearity of the transmit channels is avoided. The transmitter does not need to distribute power internally to the signal to be transmitted (i.e., the full-wave OFDM signal described above), and each antenna element in the transmit antenna array is excited by a separate modulated subcarrier.
Fig. 4 is a schematic block diagram of a subcarrier modulation array module according to an embodiment of the present invention, as shown in fig. 4, the embodiment of the present invention employs a subcarrier modulation array to replace a single modulator in a general transmitting system, the subcarrier modulation array module is composed of a reference clock source, N phase-locked frequency synthesizers, and N subcarrier modulators, each subcarrier modulator receives one of N parallel code streams as a modulation code, the subcarrier modulation format may be PSK, QAM, or any other format, the N modulated subcarriers are not combined, are respectively and independently output, and excite a corresponding channel of an active antenna transmitting array.
Fig. 5 is a schematic block diagram of an active antenna transmit array module according to an embodiment of the present invention, and as shown in fig. 5, the active antenna transmit array radiates radio signals to a space to form a full-wave OFDM signal including all modulated subcarriers with a desired power level in a required spatial range, so as to be received by a communication receiving end and used for information extraction processing. Different from the existing active phased array transmission system, the active antenna array adopted by the embodiment of the invention is provided with N input ports, each port inputs one modulated subcarrier, each channel in the array only amplifies one modulated subcarrier, and each antenna unit only radiates one modulated subcarrier. The array need not contain components such as transmit signal power distribution networks, phase shifters, etc. that are necessary for conventional phased array systems.
The embodiment of the invention provides a signal transmitting device based on SCPC array and symbol space synthesis, wherein a full-wave signal containing all modulated subcarriers does not exist at any position inside a transmitter, a single modulated subcarrier is used instead, each modulated subcarrier is processed by one transmitting channel of a transmitting array and radiated to space by one antenna unit in an array antenna, and OFDM symbols are synthesized in space. The transmitter can adopt a saturated power amplifier with extremely high power supply efficiency without worrying about the linearity, the power supply required by reaching the same transmitting power level has the lowest power consumption and the minimum heat dissipation capacity, and the corresponding debugging and maintenance are also simplest and most convenient.
On the basis of the foregoing embodiment, further, the performing serial-to-parallel conversion on the information to be transmitted to generate a plurality of parallel code streams specifically includes:
and performing serial-parallel conversion on information to be transmitted, inserting a pilot code, and generating a plurality of paths of parallel code streams.
Specifically, fig. 6 is a schematic diagram of an operating principle of a signal transmitting apparatus based on SCPC array and symbol space synthesis according to an embodiment of the present invention, as shown in fig. 6, in a process of performing serial-to-parallel conversion on information to be transmitted to generate a multi-path parallel code stream, an information bit stream to be transmitted is first converted into an N-bit parallel code stream, and forms N-path parallel transmission code streams with an m-bit pilot code, where the N-path transmission code streams respectively modulate N orthogonal subcarriers, modulated subcarriers are not synthesized and are independently amplified, and then respectively excite N antenna units to radiate to space, so as to obtain a full-wave OFDM symbol including information of all subcarriers in an antenna radiation region. The receiving device of the correspondent node can adopt a conventional OFDM receiver to receive and demodulate information.
Fig. 7 is a schematic block diagram of serial-to-parallel conversion and pilot insertion provided in the embodiment of the present invention, as shown in fig. 7, similar to the existing OFDM transmitter, which is used to implement serial-to-parallel conversion and pilot insertion for an information stream to be transmitted, but different from the existing OFDM transmitter, the embodiment of the present invention is insensitive to the position of a parallel code stream for pilot insertion, because pilot subcarriers can be arbitrarily set in a subcarrier modulation array as needed.
The embodiment of the invention provides a signal transmitting device based on SCPC array and symbol space synthesis, wherein a full-wave signal containing all modulated subcarriers does not exist at any position inside a transmitter, a single modulated subcarrier is used instead, each modulated subcarrier is processed by one transmitting channel of a transmitting array and radiated to space by one antenna unit in an array antenna, and OFDM symbols are synthesized in space. The transmitter can adopt a saturated power amplifier with extremely high power supply efficiency without worrying about the linearity, the power supply required by reaching the same transmitting power level has the lowest power consumption and the minimum heat dissipation capacity, and the corresponding debugging and maintenance are also simplest and most convenient.
On the basis of the above embodiments, further, the apparatus further includes a frequency conversion module;
and the frequency conversion module is used for carrying out frequency conversion on each path of modulated subcarriers.
Specifically, the signal transmitting apparatus further includes a frequency conversion module, and frequency-converts each of the plurality of modulated subcarriers by the frequency conversion module before the plurality of antenna units respectively radiate the plurality of modulated subcarriers to the space.
The embodiment of the invention adopts a subcarrier modulation array to replace a single modulator in a general transmitting system, a subcarrier modulation array module consists of a reference clock source, N phase-locked frequency synthesizers and N subcarrier modulators, each subcarrier modulator receives one of N paths of parallel code streams as a modulation code, the subcarrier modulation system can be PSK, QAM or any other system, the N paths of modulated subcarriers are not combined and are respectively and independently output, and corresponding channels of an active antenna transmitting array are excited.
Fig. 8 is a schematic block diagram of an up-conversion array according to an embodiment of the present invention, as shown in fig. 8, when the up-conversion array is applied to a transmission system with a very high frequency band, N modulated subcarriers may be subjected to up-conversion processing first, so as to shift N subcarrier frequencies to a desired operating frequency band.
The embodiment of the invention provides a signal transmitting device based on SCPC array and symbol space synthesis, wherein a full-wave signal containing all modulated subcarriers does not exist at any position inside a transmitter, a single modulated subcarrier is used instead, each modulated subcarrier is processed by one transmitting channel of a transmitting array and radiated to space by one antenna unit in an array antenna, and OFDM symbols are synthesized in space. The transmitter can adopt a saturated power amplifier with extremely high power supply efficiency without worrying about the linearity, the power supply required by reaching the same transmitting power level has the lowest power consumption and the minimum heat dissipation capacity, and the corresponding debugging and maintenance are also simplest and most convenient.
Based on the above embodiments, further, the cyclic prefix of the OFDM symbol is formed by controlling and extending the transmission duration of each modulated subcarrier.
Specifically, fig. 3 is a schematic block diagram of a signal transmitting apparatus based on SCPC array and symbol space synthesis according to an embodiment of the present invention, and as shown in fig. 3, the signal transmitting apparatus further includes a symbol timing module, and a cyclic prefix is an important technical means for OFDM modulation waveform to combat multipath interference.
In addition, a cyclic suffix needs to be added, fig. 9 is a schematic block diagram of OFDM cyclic suffix insertion provided by the embodiment of the invention, and fig. 10 is a timing diagram of OFDM cyclic suffix insertion provided by the embodiment of the invention.
The embodiment of the invention provides a signal transmitting device based on SCPC array and symbol space synthesis, wherein a full-wave signal containing all modulated subcarriers does not exist at any position inside a transmitter, a single modulated subcarrier is used instead, each modulated subcarrier is processed by one transmitting channel of a transmitting array and radiated to space by one antenna unit in an array antenna, and OFDM symbols are synthesized in space. The transmitter can adopt a saturated power amplifier with extremely high power supply efficiency without worrying about the linearity, the power supply required by reaching the same transmitting power level has the lowest power consumption and the minimum heat dissipation capacity, and the corresponding debugging and maintenance are also simplest and most convenient.
Fig. 11 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 11, the electronic device includes: a processor 1101, a memory 1102, and a bus 1103;
wherein, the processor 1101 and the memory 1102 complete the communication with each other through the bus 1103;
the processor 1101 is configured to call the program instructions in the memory 1102 to perform the methods provided by the above-described method embodiments, including, for example:
carrying out serial-parallel conversion on information to be transmitted to generate a plurality of paths of parallel code streams;
modulating a plurality of orthogonal subcarriers by utilizing the multi-path parallel code streams respectively to generate a plurality of paths of modulated subcarriers;
and respectively radiating the multiple modulated subcarriers to space by using a plurality of antenna units, wherein each antenna unit radiates one modulated subcarrier, so that a full-wave Orthogonal Frequency Division Multiplexing (OFDM) symbol containing all subcarrier information is contained in an antenna radiation area.
Embodiments of the present invention provide a computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions that, when executed by a computer, enable the computer to perform the methods provided by the above-mentioned method embodiments, for example, including:
carrying out serial-parallel conversion on information to be transmitted to generate a plurality of paths of parallel code streams;
modulating a plurality of orthogonal subcarriers by utilizing the multi-path parallel code streams respectively to generate a plurality of paths of modulated subcarriers;
and respectively radiating the multiple modulated subcarriers to space by using a plurality of antenna units, wherein each antenna unit radiates one modulated subcarrier, so that a full-wave Orthogonal Frequency Division Multiplexing (OFDM) symbol containing all subcarrier information is contained in an antenna radiation area.
Embodiments of the present invention provide a non-transitory computer-readable storage medium, which stores computer instructions, where the computer instructions cause the computer to perform the methods provided by the above method embodiments, for example, the methods include:
carrying out serial-parallel conversion on information to be transmitted to generate a plurality of paths of parallel code streams;
modulating a plurality of orthogonal subcarriers by utilizing the multi-path parallel code streams respectively to generate a plurality of paths of modulated subcarriers;
and respectively radiating the multiple modulated subcarriers to space by using a plurality of antenna units, wherein each antenna unit radiates one modulated subcarrier, so that a full-wave Orthogonal Frequency Division Multiplexing (OFDM) symbol containing all subcarrier information is contained in an antenna radiation area.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The above-described embodiments of the apparatuses and devices are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A signal transmitting method based on single-channel single-carrier SCPC array and symbol space synthesis is characterized by comprising the following steps:
carrying out serial-parallel conversion on information to be transmitted to generate a plurality of paths of parallel code streams;
modulating a plurality of orthogonal subcarriers by utilizing the multi-path parallel code streams respectively to generate a plurality of paths of modulated subcarriers;
a plurality of antenna units are utilized to respectively radiate the multi-path modulated subcarriers to the space, and each antenna unit radiates one path of modulated subcarriers, so that a full-wave Orthogonal Frequency Division Multiplexing (OFDM) symbol containing all subcarrier information in an antenna radiation area is formed;
the cyclic prefix of the OFDM symbol is formed by controlling and extending the transmission duration of each modulated subcarrier;
further comprising, adding a cyclic suffix to the OFDM symbol.
2. The method according to claim 1, wherein the performing serial-to-parallel conversion on the information to be transmitted to generate a plurality of parallel code streams specifically includes:
and performing serial-parallel conversion on information to be transmitted, inserting a pilot code, and generating a plurality of paths of parallel code streams.
3. The method of claim 1, wherein prior to separately radiating the plurality of modulated subcarriers to space using the plurality of antenna elements, further comprising:
and performing frequency conversion on each path of modulated subcarriers.
4. A signal transmitting apparatus based on a single-channel single-carrier SCPC array and symbol space synthesis, comprising:
the serial-parallel conversion module is used for performing serial-parallel conversion on information to be transmitted to generate a plurality of paths of parallel code streams;
the subcarrier modulation array module is used for modulating a plurality of orthogonal subcarriers by utilizing the multipath parallel code streams respectively to generate multipath modulated subcarriers;
the active antenna transmitting array module is used for respectively radiating the multiple paths of modulated subcarriers to space by utilizing a plurality of antenna units, and each antenna unit radiates one path of modulated subcarriers so that a full-wave Orthogonal Frequency Division Multiplexing (OFDM) symbol containing all subcarrier information is contained in an antenna radiation area;
the cyclic prefix of the OFDM symbol is formed by controlling and extending the transmission duration of each modulated subcarrier;
further comprising, adding a cyclic suffix to the OFDM symbol.
5. The apparatus according to claim 4, wherein the performing serial-to-parallel conversion on the information to be transmitted to generate a plurality of parallel code streams specifically includes:
and performing serial-parallel conversion on information to be transmitted, inserting a pilot code, and generating a plurality of paths of parallel code streams.
6. The apparatus of claim 4, further comprising a frequency conversion module;
and the frequency conversion module is used for carrying out frequency conversion on each path of modulated subcarriers.
7. An electronic device, comprising:
the processor and the memory are communicated with each other through a bus; the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of claims 1 to 3.
8. A non-transitory computer-readable storage medium having stored thereon a computer program, which, when executed by a processor, implements the method of any one of claims 1 to 3.
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