CN115396271B

CN115396271B - Method and equipment for transmitting and receiving single-carrier double-antenna signal under multipath channel

Info

Publication number: CN115396271B
Application number: CN202210923943.6A
Authority: CN
Inventors: 熊军
Original assignee: Beijing Rinfon Technology Co ltd
Current assignee: Ruixinfeng Aerospace Technology Beijing Co ltd
Priority date: 2022-08-02
Filing date: 2022-08-02
Publication date: 2023-12-08
Anticipated expiration: 2042-08-02
Also published as: CN115396271A

Abstract

The application relates to a method and equipment for transmitting and receiving single-carrier double-antenna signals under a multipath channel, wherein the method comprises the following steps: acquiring an information bit stream to be transmitted, and carrying out channel coding and constellation modulation on the information bit stream to be transmitted to obtain a time domain data stream; inserting a plurality of initial data streams into a time slot to obtain a first service data stream; performing FFT on the first service data stream to obtain a first service data stream in a frequency domain form; STBC coding is carried out on the first service data stream in the frequency domain form, and a space-time coding matrix is obtained; performing IFFT on the space-time coding matrix to obtain a space-time coding matrix in a time domain form, and dividing the space-time coding matrix in the time domain form into two groups of second service data streams; inserting pilot frequency before two groups of second service data streams to form antenna signals; an antenna signal is transmitted from an antenna port. When the QPSK modulated signal is transmitted, the transmitting antenna part carries out signal processing based on one FFT and IFFT, so that the transmitting structure is simpler.

Description

Method and equipment for transmitting and receiving single-carrier double-antenna signal under multipath channel

Technical Field

The present application relates to the technical field of signal communication, and in particular, to a method and apparatus for transmitting and receiving a single carrier dual antenna signal in a multipath channel.

Background

In communication, an OFDM (Orthogonal Frequency Division Multiplexing ) mode is often adopted, because the OFDM mode can effectively combat multipath delay and improve transmission rate, but an OFDM system adopts a multi-carrier modulation mode instead of a frequency diversity mode, so that better performance can be obtained by being matched with other diversity technologies.

Currently, in the third generation partnership project (3 GPP), SC-FDMA (Single-carrier Frequency-Division Multiple Access, single-Carrier frequency division multiple Access) technology is employed for uplink transmission. In the SC-FDMA system, the uplink transmission adopts a STBC (Space Time Block Code, space-time block coding) diversity transmission method, thereby solving the problem that the OFDM mode needs to be matched with other diversity technologies. However, the uplink transmission unit in the related art needs to perform STBC coding in the frequency domain, but cannot perform STBC coding in the time domain, and separately performs STBC coding on the data streams in different periods, divides the data streams of each period into multiple groups of data streams, and separately performs IFFT (Inverse Fast Fourier Transform ) on the multiple groups of data streams, resulting in that STBC coding needs to be performed between DFT (Discrete Fourier Transform ) and IFFT in the SC-FDMA system, and multiple DFT, IFFT processes are required, increasing complexity of the system.

Disclosure of Invention

The application aims to provide a method and equipment for transmitting and receiving single-carrier double-antenna signals under a multipath channel, which are used for solving at least one technical problem.

In a first aspect, the present application provides a method for transmitting a single-carrier dual-antenna signal under a multipath channel, which adopts the following technical scheme:

a method of transmitting a single carrier dual antenna signal under a multipath channel, the method comprising:

acquiring an information bit stream to be transmitted, and carrying out channel coding and constellation modulation on the information bit stream to be transmitted to obtain a time domain data stream, wherein the time domain data stream comprises a plurality of initial data streams;

inserting a plurality of initial data streams into time slots to obtain a first service data stream;

performing FFT on the first service data stream to obtain a first service data stream in a frequency domain form;

STBC coding is carried out on the first service data stream in the frequency domain form, so that a space-time coding matrix is obtained;

performing IFFT on the space-time coding matrix to obtain a space-time coding matrix in a time domain form, and dividing the space-time coding matrix in the time domain form into two groups of second service data streams;

inserting pilot frequency before the two groups of second service data streams to form antenna signals;

The antenna signal is transmitted from an antenna port.

By adopting the technical scheme, channel coding and constellation modulation are carried out on the information bit stream to be transmitted to obtain a time domain data stream, and a plurality of initial data streams in the time domain data stream are inserted into time slots to obtain a first service data stream; because STBC coding needs to be performed on a frequency domain, FFT is performed on the first service data stream to obtain a first service data stream in a frequency domain form, STBC coding is performed, and the data streams are integrated to obtain a space-time coding matrix; the space-time coding matrix can be converted into a space-time coding matrix in a time domain form only by performing IFFT once again, and the space-time coding matrix is divided into two groups of second service data streams; a pilot is inserted before the second traffic data stream to form an antenna signal and transmitted from an antenna transmitter port. In the application, when STBC coding is carried out, the data streams after STBC coding are integrated in a space-time coding matrix, and then the space-time coding matrix is subjected to IFFT only once, however, in the related art, the data streams are respectively subjected to STBC coding according to different time periods, the data streams in each time period are divided into a plurality of groups of data streams, and then the plurality of groups of data streams are respectively subjected to IFFT. When the QPSK modulated signal is transmitted, the transmitting antenna part carries out signal processing based on one FFT and IFFT, so that the transmitting structure is simpler.

The present application may be further configured in a preferred example to: the step of performing STBC coding on the first service data stream in the frequency domain form to obtain a space-time coding matrix comprises the following steps:

performing conjugate operation on the first service data stream in the frequency domain form to obtain a first service data stream in a conjugate form;

and forming the space-time coding matrix by the first service data stream in the frequency domain form and the first service data stream in the conjugate form according to space-time orthogonality, wherein conjugate operation and data stream orthogonal processing can be performed by using the STBC coding.

By adopting the technical scheme, the space-time coding matrix can be obtained by performing conjugate operation and data stream orthogonal processing when STBC coding is performed, and the data stream in the space-time coding matrix can be known to change the first service data stream into two groups of data streams with the same data but different forms after STBC coding. The STBC coding only performs conjugate operation, and does not cause the increase of peak-to-average ratio.

The present application may be further configured in a preferred example to: inserting pilot frequency before the two groups of second service data flows to form antenna signals, comprising:

and inserting pilot frequency with a first CP before the two groups of second service data streams to form antenna signals.

By adopting the technical scheme, the pilot frequency with the first CP is inserted before two groups of second service data streams, the pilot frequency with the first CP can enable the receiver to perform channel estimation more accurately, and the multipath resistance can be improved.

The present application may be further configured in a preferred example to: inserting the plurality of initial data streams into a time slot to obtain a first service data stream, including:

inserting a plurality of initial data streams into time slots to obtain initial first service data streams;

and inserting a second CP before and after the initial first service data stream to obtain the first service data stream.

By adopting the technical scheme, the second CP is inserted before and after the initial first service data stream, so that multipath information of pilot frequency can be prevented from falling into the initial first service data stream, and the influence of Gibbs jitter on the initial first service data stream during single carrier frequency domain equalization of a receiver is prevented.

The present application may be further configured in a preferred example to: after the antenna signal is formed, the method further comprises:

filtering the antenna signal to obtain a filtered antenna signal;

accordingly, the transmitting the antenna signal from the antenna port includes:

And transmitting the filtered antenna signal from an antenna port.

By adopting the technical scheme, the antenna signal is subjected to filtering processing, and then the filtered antenna signal is transmitted from the antenna port, so that the influence of interference on the signal can be reduced, and the accuracy of the transmitted signal is improved.

In a second aspect, the present application provides a method for receiving a single-carrier dual-antenna signal under a multipath channel, which adopts the following technical scheme:

a method of receiving a single carrier dual antenna signal under a multipath channel, the method comprising:

acquiring an antenna signal, and performing FFT according to the antenna signal to obtain an antenna signal in a frequency domain form;

performing resource demapping according to the frequency domain form antenna signal to extract pilot frequency and a third service data stream;

performing channel estimation according to the pilot frequency to obtain a channel response value, and performing STBC decoding according to the third service data stream and the channel response value to obtain a fourth service data stream;

performing IFFT according to the fourth service data stream to obtain a fourth service data stream in a time domain form;

and performing constellation diagram mapping and channel decoding according to the fourth service data stream in the time domain form to obtain an information bit stream.

By adopting the technical scheme, after the antenna signal is obtained, FFT is carried out according to the antenna signal, then resource demapping is carried out according to the antenna signal in the frequency domain form, and pilot frequency and a third service data stream are extracted. And performing channel estimation according to the pilot frequency, performing STBC decoding to obtain a fourth service data stream, performing IFFT, and converting the fourth service data stream into a time domain form. And performing constellation diagram mapping and channel decoding according to the fourth service data stream to obtain an information bit stream. By performing channel estimation and STBC decoding, the antenna signal can be accurately recovered at the receiver.

The present application may be further configured in a preferred example to: the fourth service data stream in the time domain form comprises a second CP;

performing constellation diagram mapping and channel decoding according to the fourth service data stream in the time domain form to obtain information bits, including:

removing the second CP of the fourth service data stream in the time domain form to obtain a pure fourth service data stream;

and performing constellation diagram mapping and channel decoding on the clean fourth service data stream to obtain an information bit stream.

By adopting the technical scheme, the second CP is added into the fourth service data stream, so that multipath information of pilot frequency can be prevented from falling into the fourth service data stream, the influence of Gibbs jitter on the fourth service data during single carrier frequency domain equalization of a receiver can be prevented, the second CP is removed after IFFT is output to obtain a pure service data stream, and the purpose of removing the second CP is to remove multipath interference and improve the multipath resistance.

The present application may be further configured in a preferred example to: after the antenna signal is acquired, the method further comprises:

performing synchronous timing and frequency offset compensation processing on the antenna signals to obtain processed antenna signals;

correspondingly, performing FFT according to the antenna signal to obtain an antenna signal in a frequency domain form, including:

and carrying out FFT on the processed antenna signals to obtain frequency domain antenna signals.

By adopting the technical scheme, the antenna signals are subjected to synchronous timing and frequency offset compensation, and then the processed antenna signals are subjected to FFT, so that the received signals can be recovered as correctly as possible.

The present application may be further configured in a preferred example to: after the IFFT is performed according to the fourth service data stream to obtain a fourth service data stream in a time domain form, the method further includes:

after the processing of the plurality of antennas is completed, combining a plurality of time domain form fourth service data streams corresponding to the plurality of antennas to obtain a combined fourth service data stream;

correspondingly, the second CP of the fourth service data stream in the time domain form is removed, and a pure fourth service data stream is obtained; performing constellation diagram mapping and channel decoding on the clean fourth service data stream to obtain an information bit stream, wherein the information bit stream comprises:

Removing the second CP of the combined fourth service data stream to obtain a pure combined fourth service data stream;

and performing constellation diagram mapping and channel decoding on the pure and combined fourth service data stream to obtain an information bit stream.

By adopting the technical scheme, because the deep fades of the signals on different antennas usually do not occur at the same time, after the fourth service data streams on different antennas are combined, the probability of the deep fades of the signals is greatly reduced relative to that of a single receiving antenna, thereby obtaining diversity gain. On the other hand, since white noise on different antennas is uncorrelated, the noise power remains unchanged after combining, and the signal energy is multiplied after combining, thereby obtaining array gain.

In a third aspect, the present application provides a transmitting device for a single carrier dual antenna signal under a multipath channel, which adopts the following technical scheme:

a transmitting device of single carrier double antenna signal under multipath channel includes,

channel coding and constellation modulation module: acquiring an information bit stream to be transmitted, and carrying out channel coding and constellation modulation on the information bit stream to be transmitted to obtain a time domain data stream, wherein the time domain data stream comprises a plurality of initial data streams;

Determining a first service data flow module: the method comprises the steps of inserting a plurality of initial data streams into time slots to obtain a first service data stream;

FFT module of the transmitter: the method comprises the steps of carrying out FFT on a first service data stream to obtain a first service data stream in a frequency domain form;

STBC coding module of the transmitter: the method comprises the steps of performing STBC coding on a first service data stream in the frequency domain form to obtain a space-time coding matrix;

IFFT module of transmitter: the method comprises the steps of performing IFFT on the space-time coding matrix to obtain a space-time coding matrix in a time domain form, and dividing the space-time coding matrix in the time domain form into two groups of second service data streams;

and forming an antenna signal module: for inserting pilot frequency before the two groups of second service data streams to form antenna signals;

and a signal transmitting module: for transmitting the antenna signal from an antenna port.

In a fourth aspect, the present application provides a receiving apparatus for a single carrier dual antenna signal under a multipath channel, which adopts the following technical scheme:

a receiving apparatus for single carrier dual antenna signals under multipath channels, comprising,

and a signal processing module: the method comprises the steps of acquiring an antenna signal, and performing FFT according to the antenna signal to obtain a frequency domain antenna signal;

and a data extraction module: the method comprises the steps of performing resource demapping according to the frequency domain form antenna signal to extract pilot frequency and a third service data stream;

channel estimation, STBC decoding module: the method comprises the steps of carrying out channel estimation according to the pilot frequency to obtain a channel response value, and carrying out STBC decoding according to the third service data stream and the channel response value to obtain a fourth service data stream;

the receiver IFFT decoding module: the method comprises the steps of performing IFFT according to the fourth service data stream to obtain a fourth service data stream in a time domain form;

constellation diagram mapping and channel decoding module: and the method is used for carrying out constellation diagram mapping and channel decoding according to the fourth service data stream to obtain an information bit stream.

In a fifth aspect, the present application provides an electronic device, which adopts the following technical scheme:

at least one processor;

a memory;

at least one application program, wherein the at least one application program is stored in the memory and configured to be executed by the at least one processor, the at least one application program configured to: performing the method of any of the first aspects.

In a sixth aspect, the present application provides an electronic device, which adopts the following technical scheme:

at least one processor;

a memory;

at least one application program, wherein the at least one application program is stored in the memory and configured to be executed by the at least one processor, the at least one application program configured to: performing the method of any of the second aspects.

In a seventh aspect, the present application provides a computer readable storage medium, which adopts the following technical scheme:

a computer readable storage medium storing at least one instruction, at least one program, set of codes, or set of instructions, the at least one instruction, the at least one program, the set of codes, or set of instructions being loaded by a processor and performing the method of any one of the first aspects.

In an eighth aspect, the present application provides a computer readable storage medium, which adopts the following technical scheme:

a computer readable storage medium storing at least one instruction, at least one program, set of codes, or set of instructions, the at least one instruction, the at least one program, the set of codes, or set of instructions being loaded by a processor and performing the method of any of the second aspects.

In summary, the present application includes at least one of the following beneficial technical effects:

1. performing channel coding and constellation modulation on an information bit stream to be transmitted to obtain a time domain data stream, and inserting a plurality of initial data streams in the time domain data stream into time slots to obtain a first service data stream; because STBC coding needs to be performed on a frequency domain, FFT is performed on the first service data stream to obtain a first service data stream in a frequency domain form, STBC coding is performed, and the data streams are integrated to obtain a space-time coding matrix; the space-time coding matrix can be converted into a space-time coding matrix in a time domain form only by performing IFFT once again, and the space-time coding matrix is divided into two groups of second service data streams; a pilot is inserted before the second traffic data stream to form an antenna signal and transmitted from an antenna transmitter port. In the application, when STBC coding is carried out, the data streams after STBC coding are integrated in a space-time coding matrix, and then the space-time coding matrix is subjected to IFFT only once, however, in the related art, the data streams are respectively subjected to STBC coding according to different time periods, the data streams in each time period are divided into a plurality of groups of data streams, and then the plurality of groups of data streams are respectively subjected to IFFT. When the QPSK modulated signal is transmitted, the transmitting antenna part carries out signal processing based on one FFT and IFFT, so that the transmitting structure is simpler;

2. After the antenna signal is obtained, FFT is carried out according to the antenna signal, then resource demapping is carried out according to the antenna signal in a frequency domain form, and pilot frequency and a third service data stream are extracted. And performing channel estimation according to the pilot frequency, performing STBC decoding to obtain a fourth service data stream, performing IFFT, and converting the fourth service data stream into a time domain form. And performing constellation diagram mapping and channel decoding according to the fourth service data stream to obtain an information bit stream. By performing channel estimation and STBC decoding, the antenna signal can be accurately recovered at the receiver.

Drawings

Fig. 1 is a diagram showing peak-to-average ratio comparison of QPSK signal, SC-FDMA signal, and OFDM signal.

Fig. 2 is a flow chart of a method for transmitting a single carrier dual antenna signal under a multipath channel according to an embodiment of the present application.

Fig. 3 is a schematic diagram of a plurality of initial data streams inserted into a slot according to one embodiment of the present application.

Fig. 4 is a schematic flow chart of STBC encoding according to one embodiment of the present application.

Fig. 5 is a schematic diagram of an STBC encoding process according to one embodiment of the present application.

Fig. 6 is a schematic diagram of a data structure of an antenna signal according to an embodiment of the present application.

Fig. 7 is a flow chart of a method for receiving a single carrier dual antenna signal under a multipath channel according to an embodiment of the present application.

Fig. 8 is a schematic diagram of a signal transmission process between a transmitter antenna and a receiver antenna according to an embodiment of the present application.

Fig. 9 is a signal amplitude diagram of IFFT output according to an embodiment of the present application.

Fig. 10 is a signal constellation diagram of IFFT output according to an embodiment of the present application.

Fig. 11 is a schematic diagram of a process flow of transmitting and receiving a single carrier dual-antenna signal under a multipath channel according to an embodiment of the present application.

Fig. 12 is a schematic diagram illustrating the simulation of various combinations of 2 x 2 antennas in suburban channels according to one embodiment of the present application.

Fig. 13 is a schematic structural diagram of a transmitting device of a single carrier dual antenna signal under a multipath channel according to an embodiment of the present application.

Fig. 14 is a schematic structural diagram of a receiving device of a single carrier dual antenna signal under a multipath channel according to an embodiment of the present application.

Fig. 15 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

The present application will be described in further detail with reference to fig. 1 to 15.

The present embodiment is merely illustrative of the present application and is not intended to limit the present application, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as necessary, but are protected by patent laws within the scope of the present application.

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

In addition, the term "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In this context, unless otherwise specified, the term "/" generally indicates that the associated object is an "or" relationship.

In communication, an OFDM mode is often adopted, which can effectively resist multipath time delay and improve transmission rate, but the OFDM mode needs to be matched with other diversity techniques to obtain better performance. In the SC-FDMA system, the uplink transmission adopts a STBC diversity transmission method, thereby solving the problem that the OFDM mode needs to be matched with other diversity technology.

The inventor found that, in the related art, the uplink transmitting unit needs to perform STBC coding in the frequency domain, and STBC coding is performed on the data streams respectively for different time periods, and after STBC coding, one group of data streams is divided into multiple groups of data streams, and IFFT is performed on the multiple groups of data streams respectively, so that in the SC-FDMA system, STBC coding needs to be performed between multiple DFTs and IFFTs, which increases the complexity of the system.

Among the modulation schemes of digital signals, QPSK is the most commonly used one, and has the advantages of higher spectrum utilization rate, stronger anti-interference performance, simpler implementation on a circuit and correspondingly, QPSK signals can be obtained by adopting QPSK modulation.

In signal communication, peak-to-average ratio, which is the ratio of the peak power to the average power of a signal over a time interval, occupies an important position to describe the amplitude of signal fluctuations. However, the peak-to-average ratio is an inherent disadvantage of multi-carrier communications, which can result in reduced system performance, and the use of a single carrier for communications can result in reduced peak-to-average ratio, lower peak-to-average ratio can result in benefits in terms of transmit efficiency for the mobile terminal, and can extend battery life. Referring to fig. 1, fig. 1 is a diagram showing peak-to-average ratio comparison of a QPSK signal, an SC-FDMA signal, and an OFDM signal, wherein the abscissa is the peak-to-average ratio; the ordinate is probability. As can be seen from fig. 1, the QPSK signal has a lower peak-to-average ratio, which can ensure the performance of the system.

The embodiment of the application provides a process for transmitting and receiving single-carrier double-antenna signals under a multipath channel, which comprises the following steps: a transmitter: acquiring an information bit stream to be transmitted, and performing channel coding and constellation modulation on the information bit stream to be transmitted to obtain a time domain data stream, wherein the time domain data stream comprises a plurality of initial data streams; inserting a plurality of initial data streams into a time slot to obtain a first service data stream; performing FFT on the first service data stream to obtain a first service data stream in a frequency domain form; STBC coding is carried out on the first service data stream in the frequency domain form, and a space-time coding matrix is obtained; performing IFFT on the space-time coding matrix to obtain a space-time coding matrix in a time domain form, and dividing the space-time coding matrix in the time domain form into two groups of second service data streams; inserting pilot frequency before two groups of second service data streams to form antenna signals; an antenna signal is transmitted from an antenna port.

A receiver: acquiring an antenna signal, and performing FFT according to the antenna signal to obtain an antenna signal in a frequency domain form; performing resource demapping according to the frequency domain form antenna signals to extract pilot frequency and a third service data stream; performing channel estimation according to the pilot frequency to obtain a channel response value, and performing STBC decoding according to the third service data stream and the channel response value to obtain a fourth service data stream; performing IFFT according to the fourth service data stream to obtain a fourth service data stream in a time domain form; and performing constellation diagram mapping and channel decoding according to the fourth service data stream in the time domain form to obtain an information bit stream.

Specifically, the transmitter adopts a QPSK modulation mode to carry out diversity transmission on QPSK signals, when STBC coding is carried out, data streams after STBC coding are integrated in a space-time coding matrix, and only one IFFT is carried out on the space-time coding matrix in the follow-up process, so that the transmission structure is simpler. After the receiver acquires the antenna signal, channel estimation, STBC decoding and other related operations are carried out, so that the antenna signal can be accurately recovered at the receiver.

The embodiment of the application provides a method for transmitting a single-carrier dual-antenna signal under a multipath channel, which is executed by electronic equipment, and specifically, the electronic equipment can be a transmitter, as shown in fig. 2, the method comprises the steps of S101, S102, S103, S104, S105, S106 and S107, wherein:

step S101: and obtaining an information bit stream to be transmitted, and carrying out channel coding and constellation modulation on the information bit stream to be transmitted to obtain a time domain data stream, wherein the time domain data stream comprises a plurality of initial data streams.

For the embodiment of the application, the information bit stream to be transmitted is obtained, and the information bit stream to be transmitted is subjected to channel coding, wherein the channel coding is a specially designed anti-interference technology and method for ensuring the transmission reliability of antenna signals and overcoming noise and interference in a channel. And carrying out channel coding on the information bit stream to be transmitted, and carrying out constellation modulation on the coded bit stream obtained after the channel coding to obtain a time domain data stream in a time domain representation form. Specifically, the information bit stream to be transmitted includes a plurality of data streams to be transmitted, and further, channel coding and constellation modulation are performed on the plurality of data streams to be transmitted, so that a time domain data stream may include a plurality of initial data streams.

Step S102: and inserting a plurality of initial data streams into the time slot to obtain a first service data stream.

For the embodiment of the application, the initial data streams are inserted into the time slots, and then the initial data streams are arranged according to the time sequence to obtain the first service data stream, for example, k initial data streams x are used ₁ ’、x ₂ ’…x _k ' inserted into the time slot to obtain the first service data stream, and the specific form is shown in fig. 3. As can be seen from fig. 3, each initial data stream is inserted into a slot, and the blank part of the slot can be inserted into other data streams in subsequent operations, which is equivalent to the first service data stream obtained here being a set of data streams, including a plurality of data streams.

Step S103: and carrying out FFT on the first service data stream to obtain the first service data stream in the frequency domain form.

For the embodiment of the application, the STBC coding is performed on the frequency domain, so that the first service data stream is subjected to FFT (fast Fourier transform ) to obtain the first service data stream in the frequency domain form, wherein the FFT is an efficient algorithm of discrete Fourier transform and can convert the data in the time domain form into the data in the frequency domain form.

Step S104: and performing STBC coding on the first service data stream in the frequency domain form to obtain a space-time coding matrix.

For the embodiment of the application, STBC encoding is carried out on the first service data stream in the frequency domain form, wherein based on the STBC encoding, conjugate operation is carried out on the first service data stream in the frequency domain form to obtain the conjugate form of the first service data stream, which is equivalent to copying the first service data stream. The first service data stream is transmitted wirelessly, which may result in partial data loss due to interference or signal attenuation, however, by transmitting different copies of the same data stream over multiple antennas, the receiver can integrate the different copies into an optimal data stream, so that the transmission of the antenna signals is more stable, and the signal transmission over a longer distance can be satisfied.

STBC coding is carried out to obtain the spaceThe time coding matrix and the space-time coding matrix may be changed according to different numbers of transmitting antennas and receiving antennas, for example, in a 2×2 antenna system (2 antennas of a transmitter and 2 antennas of a receiver), the space-time coding matrix obtained by STBC coding is a matrix of 2×2. STBC encoding is performed using a 2 x 2 antenna system, and a space-time coding matrix is obtained, which is discussed as an example, where the transmitted first traffic data stream includes: x is x ₁ ，x ₂ The first traffic data stream in frequency domain form comprises: fft (x) ₁ )、fft(x ₂ ) The conjugate operation is performed to obtain (fft (x) ₁ )) ^* 、(fft(x ₂ )) ^* To ensure space-time orthogonality, the pair (fft (x) ₂ )) ^* The negative sign is added, so that the space-time coding matrix X is:

step S105: and performing IFFT on the space-time coding matrix to obtain a space-time coding matrix in a time domain form, and dividing the space-time coding matrix in the time domain form into two groups of second service data streams.

For the embodiment of the present application, the space-time coding matrix is subjected to IFFT, so that the space-time coding matrix is converted into a time domain form, and a 2×2 antenna system is now discussed as an example, and the conversion process of other multi-antenna systems is similar and will not be discussed one by one here. For example, in the adapting step S104, when the space-time coding matrix in the frequency domain is: when the space-time coding matrix conversion process of the time domain form converted by the IFFT on X comprises the following steps: />The final time domain form of the space-time coding matrix is: />Wherein (1)> Dividing the space-time coding matrix in time domain form into two groups of second service data streams through modulation, wherein x is ₁ 、x ₂ For the first group of second traffic data flows, < > and->Is a second set of second traffic data streams.

Step S106: inserting pilot frequency before two groups of second service data streams to form antenna signals;

for the embodiment of the application, the pilot frequency is inserted before the second service data stream according to the structure of the antenna signal. The receiver may perform channel estimation by performing corresponding sequence processing on the pilot.

Step S107: an antenna signal is transmitted from an antenna port.

For the embodiment of the application, the antenna transmits the antenna signal, wherein the second service data part in the antenna signal is equivalent to multiple copies of the first service data stream, and various received versions of the first service data stream are utilized to improve the reliability of data transmission.

It can be seen that, in the embodiment of the present application, channel coding and constellation modulation are performed on an information bit stream to be transmitted to obtain a time domain data stream, and a plurality of initial data streams in the time domain data stream are inserted into a time slot to obtain a first service data stream; because STBC coding needs to be performed on a frequency domain, FFT is performed on the first service data stream to obtain a first service data stream in a frequency domain form, STBC coding is performed, and the data streams are integrated to obtain a space-time coding matrix; the space-time coding matrix can be converted into a space-time coding matrix in a time domain form only by performing IFFT once again, and the space-time coding matrix is divided into two groups of second service data streams; a pilot is inserted before the second traffic data stream to form an antenna signal and transmitted from an antenna transmitter port. In the application, when STBC coding is carried out, the data streams after STBC coding are integrated in a space-time coding matrix, and then the space-time coding matrix is subjected to IFFT only once, however, in the related art, the data streams are respectively subjected to STBC coding according to different time periods, the data streams in each time period are divided into a plurality of groups of data streams, and then the plurality of groups of data streams are respectively subjected to IFFT. When the QPSK modulated signal is transmitted, the transmitting antenna part carries out signal processing based on one FFT and IFFT, so that the transmitting structure is simpler.

Further, in order to improve the reliability of data transmission, in the embodiment of the present application, please refer to fig. 4, step S104: STBC coding is carried out on the first service data stream in the frequency domain form to obtain a space-time coding matrix, which comprises the following steps: step S1041, step S1042, wherein,

step S1041: performing conjugate operation on the first service data stream in the frequency domain form to obtain the first service data stream in the conjugate form; in the embodiment of the application, a first service data stream in a frequency domain form is acquired, and a first service data stream in a conjugate form is generated through logic processing.

Step S1042: and forming a space-time coding matrix according to the space-time orthogonality by the first service data stream in the frequency domain form and the first service data stream in the conjugate form.

In the embodiment of the application, the first service data stream in the frequency domain form and the first service data stream in the conjugate form are formed into the space-time coding matrix according to the space-time orthogonality, wherein the negative sign is added to the first service data stream in the corresponding conjugate form according to the orthogonal design theory, so that the obtained space-time coding matrix can meet the space-time orthogonality. The data discharge constituent space-time coding matrix is discussed herein as an example using a 2 x 2 antenna system. The transmitted frequency domain version of the first traffic data stream comprises: fft (x) ₁ )、fft(x ₂ ) Wherein the first traffic data stream in the transmitted frequency domain form is subjected to a conjugate operation to obtain (fft (x) ₁ )) ^* 、(fft(x ₂ )) ^* To satisfy the orthogonal relationship, will(fft(x ₂ )) ^* Transform into- (fft (x) ₂ )) ^* . The space-time coding matrix X is composed of:

for the single carrier wave of the QPSK modulation mode, the process of processing the first service data stream on two transmitting antennas can refer to fig. 5, wherein T-QPSK in fig. 5 represents the first service data stream in the form of the time domain of the QPSK single carrier wave, after FFT and IFFT processing are performed on the antenna 1, the first service data stream has no change, which is equivalent to that the antenna 1 does not need any processing before transmitting and can be directly transmitted; before the antenna 2 transmits, FFT, conjugate operation and IFFT are sequentially performed to obtain T-QPSK'.

It can be seen that, in the embodiment of the present application, conjugate operation and data stream orthogonal processing are performed when STBC encoding is performed, so that a space-time encoding matrix can be obtained, and as known from the data stream in the space-time encoding matrix, the first service data stream is changed into two groups of data streams with the same data but different forms after STBC encoding. The STBC coding only performs conjugate operation, and does not cause the increase of peak-to-average ratio.

Further, in order to make channel estimation more accurate, in the embodiment of the present application, pilot frequency is inserted before two sets of second service data flows, including:

The pilot with the first CP is inserted before the two sets of second traffic data streams.

In the embodiment of the present application, a first CP (Cyclic Prefix) is added before the pilot, and the first CP is mainly used for resisting multipath interference in an actual environment. If the first CP is not added, the orthogonality among subcarriers is affected by the time delay expansion caused by multipath, so that intersymbol interference is caused, the first CP is added, which is equivalent to the insertion of a guard interval, the energy orthogonality between the multipath time delay signal and the direct signal is realized, and the intersymbol interference caused by the multipath time delay signal is eliminated. DATA structure of antenna signal as shown in fig. 6, DATA (x in fig. 6 ₁ )、DATA(x ₂ ) Andrepresenting two sets of second traffic data flows S ₁ (TRAIN) and-PS ₁ (TRAIN) is a pilot and a first CP is inserted before the pilot.

Therefore, in the embodiment of the application, the pilot frequency with the first CP is inserted before the two groups of second service data streams, so that the pilot frequency with the first CP can enable the receiver to perform channel estimation more accurately, and the multipath resistance can be improved.

Further, in order to prevent multipath information of pilot from falling into service data and influence of Gibbs jitter on the service data when the multipath information is balanced with a single carrier frequency domain of a receiver, in an embodiment of the present application, a plurality of initial data streams are inserted into a time slot to obtain a first service data stream, including:

Inserting a plurality of initial data streams into the time slot to obtain an initial first service data stream;

In the embodiment of the application, the second CP is inserted before and after the initial first service data stream, so that multipath information of pilot frequency can be prevented from falling into the initial first service data stream, and the influence of Gibbs jitter on the initial first service data stream during single carrier frequency domain equalization of a receiver is prevented.

DATA structure of antenna signal as shown in fig. 6, DATA (x in fig. 6 ₁ )、DATA(x ₂ ) Representing the initial first service data stream, and inserting a second CP before and after the initial first service data stream to obtain the first service data stream, wherein the first service data stream is subjected to STBC coding subsequently, and the second CP is changed into a second CP through STBC coding ^* Corresponds to the second CP in antenna 2 in fig. 6 ^* 。

It can be seen that, in the embodiment of the present application, the second CP is inserted before and after the initial first service data stream, so that multipath information of the pilot frequency can be prevented from falling into the initial first service data stream, and the influence of gibbs jitter on the initial first service data stream during single carrier frequency domain equalization of the receiver is prevented.

Further, in order to improve accuracy of the transmitted signal, in the embodiment of the present application, after forming the antenna signal, the method further includes:

filtering the antenna signal to obtain a filtered antenna signal;

accordingly, transmitting an antenna signal from an antenna port, comprising:

the filtered antenna signal is transmitted from the antenna port.

In the embodiment of the application, the antenna signal is subjected to filtering processing, so that the influence of interference on the signal can be reduced, and the accuracy of the transmitted signal is improved. The filtering process may use a digital filter, a low-pass filter, a band-pass filter, a to-be-blocked filter, etc., as long as the filtering process can be performed on the antenna signal, and the embodiment of the present application is not limited as to what kind of filter is used. Preferably, the Filter used in the filtering process is a low-pass Filter, and may specifically be an RRC Filter (RRC Filter, root raised cosine Filter).

Therefore, in the embodiment of the application, the antenna signal is filtered, and the filtered antenna signal is transmitted from the antenna port, so that the influence of interference on the signal can be reduced, and the accuracy of the transmitted signal is improved.

The embodiment of the application provides a receiving method of a single-carrier double-antenna signal under a multipath channel, which is executed by electronic equipment, and the electronic equipment can be a receiver. As shown in fig. 7, the method includes step S301, step S302, step S303, step S304, and step S305, wherein:

Step S301: obtaining an antenna signal, and performing FFT on the antenna signal to obtain an antenna signal in a frequency domain form;

the antenna signal in the embodiment of the present application is an antenna signal sent by a transmitter, and a specific process of sending the antenna signal by the transmitter includes: performing channel coding and constellation modulation on the acquired information bit stream to be transmitted to obtain a time domain data stream; inserting a plurality of initial data streams into a time slot to obtain a first service data stream; performing FFT on the first service data stream to obtain a first service data stream in a frequency domain form; STBC coding is carried out on the first service data stream in the frequency domain form, and a space-time coding matrix is obtained; performing IFFT on the space-time coding matrix to obtain a space-time coding matrix in a time domain form, and dividing the space-time coding matrix in the time domain form into two groups of second service data streams; and inserting pilot frequency before the two groups of second service data streams to form antenna signals. With specific reference to the above embodiments, this step will not be described.

Step S302: performing resource demapping on the frequency domain form antenna signal to extract pilot frequency and a third service data stream;

in the embodiment of the application, the resource demapping is carried out on the frequency domain form antenna signal, and the pilot frequency and the third service data stream are respectively extracted according to the mapping result.

Step S303: performing channel estimation according to the pilot frequency to obtain a channel response value, and performing STBC decoding according to the third service data stream and the channel response value to obtain a fourth service data stream;

in the embodiment of the application, the space channels between the transmitting and receiving paths are identified based on the extracted pilot frequency, and the channels are subjected to channel estimation to obtain the channel response value. There are various methods for performing channel estimation, such as LS algorithm, MMSE algorithm, pilot symbol analysis compensation algorithm, etc., and the present application does not limit the channel estimation algorithm any more, as long as the channel response value can be obtained.

In the receiver, the processing procedure of each antenna for the third service data stream and the pilot frequency is the same, and for simplicity of description, the processing procedure of one receiving antenna is discussed with a 2 x 2 antenna system, and for the processing procedure of the second antenna is similar to the processing procedure described in the embodiment of the present application, and the embodiment of the present application is not described again.

Wherein, the third service data streams received by the receiving antenna 1 are Y respectively ₁₁ ，Y ₁₂ Wherein Y is _ab Subscript a represents the receive antenna number and subscript b represents the slot number. Channel estimation is carried out according to the pilot frequency to obtain a channel response value H ₁₁ ，H ₂₁ Wherein H is _mn Subscript m represents the transmit antenna number and subscript n represents the receive antenna number.

In a 2 x 2 antenna system, transmitter antenna and receiver antenna signalingAs shown in FIG. 8, four channels are used for signal transmission between two transmitting antennas and two receiving antennas, and the channel response values of the four channels are H respectively ₁₁ ，H ₂₁ ，H ₂₁ ，H ₂₂ Wherein H is _mn Subscript m represents the transmit antenna number and subscript n represents the receive antenna number. And performing STBC decoding according to the third service data stream and the channel response value of the response transmission channel to obtain the processed third service data stream.

STBC decoding is carried out according to the relation between the receiving and transmitting signals, and the relation of the receiving and transmitting signals on the frequency domain is as follows:

Y ₁₁ ＝X ₁ H ₁₁ -X ₂ ^* H ₂₁ +N ₁₁ ；

Y ₁₂ ＝X ₂ H ₁₁ +X ₁ ^* H ₂₁ +N ₁₂ 。

wherein Y is ₁₁ ，Y ₁₂ A third service data stream received for the receiving antenna 1; h ₁₁ ，H ₂₁ Channel response values for the transmitter to the receiving antenna 1; n (N) ₁₁ ，N ₁₂ Is noise on both channels; x is X ₁ 、X ₂ 、X ₁ ^* 、-X ₂ ^* And the second service data stream in the antenna signal transmitted by the transmitter is according to the relation of the receiving and transmitting signals.

For Y ₁₂ This equation takes the conjugate and transforms into:

Y ₁₁ ＝X ₁ H ₁₁ -X ₂ ^* H ₂₁ +N ₁₁ ；

Y ₁₂ ^* ＝X ₁ H ₂₁ ^* +X ₂ ^* H ₁₁ ^* +N ₁₂ ^* and then can obtain:

wherein, define->

The minimum mean square error algorithm MMSE may be employed in order to obtain the parameter W such that the mean square value is minimized by E { [ WY-X ] ][WY-X] ^H -0, wherein E represents a mathematical expectation; w represents the best matched filter coefficient; x represents the antenna signal in frequency domain form transmitted by the transmitter; y represents the antenna signal in frequency domain form received by the receiver; h represents a transpose conjugate, and can be obtained:

wherein I represents an identity matrix, N ₀ Representing the noise power.

After W is found, a solution of X can be obtained, where X1 and X2 solved are the fourth traffic data stream:

step S304: performing IFFT on the fourth service data stream to obtain a fourth service data stream in a time domain form;

in the embodiment of the application, the fourth service flow in the frequency domain form is subjected to IFFT, and can be converted into the time domain form. The fourth service data stream in the time domain form is:where the fourth traffic data stream processed by the receiver corresponds to the first traffic data stream transmitted by the transmitter.

Step S305: and performing constellation diagram mapping and channel decoding on the fourth service data stream to obtain an information bit stream.

In the embodiment of the application, after constellation diagram mapping and channel decoding are carried out on the fourth service data stream, an information bit stream is obtained, wherein the information bit stream obtained by the receiver corresponds to the information bit stream to be transmitted and transmitted by the transmitter.

It can be seen that, in the embodiment of the present application, after the antenna signal is obtained, FFT is performed according to the antenna signal, and then resource demapping is performed according to the antenna signal in the frequency domain form, so as to extract the pilot frequency and the third service data stream. And performing channel estimation according to the pilot frequency, performing STBC decoding to obtain a fourth service data stream, performing IFFT, and converting the fourth service data stream into a time domain form. And performing constellation diagram mapping and channel decoding according to the fourth service data stream to obtain an information bit stream. By performing channel estimation and STBC decoding, the antenna signal can be accurately recovered at the receiver.

Further, in order to improve the multipath resistance, in the embodiment of the present application, the fourth service data stream in the time domain form includes a second CP;

In the embodiment of the application, the fourth service data flow x in the form of time slots ₁ ，x ₂ And respectively removing the second CPs, wherein the implementation process is as follows: The obtained pure service data flow is x _d1 、x _d2 . The second CP is inserted in front and back of the fourth service data flow in the antenna signal, and the second CP is removed, so that the multipath interference is removed, and the multipath resistance is obviously improved.

As shown in fig. 9, it is clear that the output service signal of the second CP is not removed, the vibration amplitude of the signal at both ends of the input sequence is large, and the second CP at both ends of the second service data stream is removed, so that multipath interference can be given to the removal. As shown in fig. 10, it can be clearly seen that the distribution of the traffic signals output by the IFFT with and without the second CP removed in the constellation diagram, and it can be known that the removal of the second CP can effectively resist multipath interference.

Therefore, in the embodiment of the application, the second CP is added to the fourth service data stream, so that multipath information of pilot frequency can be prevented from falling into the fourth service data stream, and the influence of Gibbs jitter on the fourth service data during single carrier frequency domain equalization of the receiver can be prevented.

Further, in order to recover the received signal as correctly as possible, in the embodiment of the present application, after acquiring the antenna signal, the method further includes:

correspondingly, performing FFT on the antenna signal to obtain an antenna signal in a frequency domain form, including:

and carrying out FFT on the processed antenna signals to obtain the antenna signals in the frequency domain.

In the embodiment of the application, in order to correctly recover the information transmitted by the transmitter, the antenna signals can be synchronously timed. The manner of synchronizing the antenna signals may include: synchronizing the antenna signals based on the Gardner algorithm may also include: the PSS timing synchronization algorithm is adopted to synchronize and time the antenna signals, and the embodiment of the application is not limited any more as long as the method can be realized.

After synchronous timing processing is carried out on the antenna signals, the antenna signals after initial processing are obtained, and frequency offset compensation processing is carried out on the antenna signals after initial processing. Specifically, because the oscillator between the transmitter and the receiver is not matched or doppler shift exists, the frequency deviation of the sampling clock between the transmitter and the receiver is easy to cause, the frequency deviation refers to the deviation of the frequency of the fixed frequency modulation wave to two sides, the frequency deviation influences the spectrum bandwidth of the frequency modulation wave, and the common carrier frequency deviation estimation method comprises carrier frequency deviation estimation based on FFT and carrier frequency deviation estimation based on instantaneous frequency measurement. The method of frequency offset compensation is not limited any more in this embodiment, as long as the frequency offset can be obtained. And then frequency offset compensation is carried out based on the obtained frequency offset, so that the received signal can be recovered as correctly as possible.

It can be seen that in the embodiment of the present application, the synchronization timing and frequency offset compensation are performed on the antenna signal, and then the FFT is performed on the processed antenna signal, so that the received signal can be recovered as correctly as possible.

Further, in order to obtain diversity gain, in the embodiment of the present application, after performing IFFT on the fourth service data stream to obtain a fourth service data stream in a time domain form, the method further includes:

in the embodiment of the present application, the fourth service data streams in multiple time domain forms are combined, and the embodiment of the present application is not limited in the manner of combining. The fourth service data streams in a plurality of time domain forms can be combined by selecting maximum ratio combination, and the maximum ratio combination multiplies different coefficients w by N paths of different fourth service data streams in diversity _i (i=1, 2, …, N) combining the signals, determining coefficients and fading coefficients h of the N branches _i (i=1, 2, …, N) and the coefficient w _i And fading coefficient h _i Is related toWherein w is _m A coefficient multiplied by the mth fourth service data stream, w _n A coefficient multiplied by the nth fourth service data stream, h _m A fading coefficient h for the mth branch _n Is the fading coefficient of the nth branch. And after the merging operation, obtaining a merged fourth service data stream.

Correspondingly, removing the second CP of the fourth service data stream in the time domain form to obtain a pure fourth service data stream; performing constellation diagram mapping and channel decoding on the clean fourth service data stream to obtain an information bit stream, wherein the method comprises the following steps:

removing the second CP merging the fourth service data stream to obtain a pure merged fourth service data stream;

and performing constellation diagram mapping and channel decoding on the fourth service data stream which is purely combined to obtain an information bit stream.

In the embodiment of the application, due to the fading characteristic of the wireless channel, the wireless channel between the transmitter and the receiver can have deep fading (10-20 dB) with time, thereby causing fluctuation of the received signal SINR (Signal to Interference plus Noise Ratio ).

It can be seen that, in the embodiment of the present application, a plurality of fourth service data streams in a time domain form are combined, and the combined fourth service data stream is processed to obtain an information bit stream. Since deep fades of signals on different antennas generally do not occur simultaneously, when fourth service data streams on different antennas are combined, the probability of deep fades of signals is greatly reduced relative to a single receiving antenna, thereby obtaining diversity gain. On the other hand, since white noise on different antennas is uncorrelated, the noise power remains unchanged after combining, and the signal energy is multiplied after combining, thereby obtaining array gain.

As shown in fig. 11, a process flow diagram of transmission and reception of a single carrier dual antenna signal under a multipath channel is provided.

The transmitter carries out channel coding and constellation modulation on the information bit stream to be transmitted, inserts a plurality of initial data streams into time slots, and inserts a second CP before and after the initial data streams to obtain a first service data stream. And then carrying out FFT on the first service data stream, carrying out STBC coding on the first service data stream in a frequency domain form to obtain a space-time coding matrix, carrying out IFFT on the space-time coding matrix to obtain a space-time coding matrix in a time domain form, and dividing the space-time coding matrix in the time domain form into two groups of second service data streams. And inserting pilot frequency with the first CP before the two groups of second service data streams to form antenna signals, and transmitting the antenna signals from the antenna ports.

After the receiver acquires the antenna signal, synchronous timing and frequency offset compensation processing is carried out on the antenna signal, FFT is carried out on the processed antenna signal, and then resource demapping is carried out on the antenna signal in a frequency domain form, so that pilot frequency and a third service data stream are extracted. And carrying out channel estimation according to the pilot frequency to obtain a channel response value, and carrying out STBC decoding according to the third service data stream and the channel response value to obtain a fourth service data stream. And performing IFFT according to the fourth service data stream, and removing the second CPs before and after the fourth service data stream to obtain a pure fourth service data stream. And then merging the plurality of pure fourth service data streams in the time domain form to obtain pure merged fourth service data streams, and performing constellation diagram mapping and channel decoding on the pure merged fourth service data streams to obtain an information bit stream.

In order to verify the performance of the transmission method, the receiving method and the equipment of the QSPK signal, the application takes the actual application scene (1400 MHz carrier frequency, long-distance transmission and 10Mbit/s of information transmission rate) as a prototype, adopts a typical Rayleigh distribution model to simulate the fading experienced by a transmitted signal from a transmitter to a receiver, and adopts a common statistical model method to model a channel. QSPK signalling is applied for long-range transmission between point-to-point (greater than 100 Km) and takes into account the relative mobility between transceivers (relative movement speeds not exceeding 120 Km/h). In wireless digital communications, communication data is transmitted on a time slot basis, and it is generally assumed that the channel characteristics within each time slot are approximately considered to be constant. Because the condition of the actual channel needs to be considered in the design of the communication system, the multipath number of the channel model is determined to be 6 according to the wireless signal propagation environment applied by the actual communication system, the maximum multipath time delay is respectively 12.2 microseconds and 20 microseconds, and the maximum multipath time delay is respectively recorded as RH+ and LM+ channels for simplicity. Simulations of various combinations of 2 x 2 antennas in suburban channels, reference may be made to fig. 12, where the abscissa is the bit signal-to-noise ratio; the ordinate is the original bit error rate. 1rx 1tx represents 1 transmitting antenna and 1 receiving antenna; 1rx x 2tx represents 1 transmit antenna and 2 receive antennas; 2rx 1tx represents 2 transmit antennas and 1 receive antenna; 2rx x 2tx represents 2 transmit antennas and 2 receive antennas. The combined power of the two transmitting antennas is the same as the transmitting power of one transmitting antenna, for example, the transmitting power of each transmitting antenna is 20W when the two transmitting antennas transmit, and the transmitting power of one transmitting antenna is 40W when the one transmitting antenna transmits.

The foregoing embodiment describes a method for transmitting a single-carrier dual-antenna signal under a multipath channel from the perspective of a method flow, and the following embodiment describes a device 200 for transmitting a single-carrier dual-antenna signal under a multipath channel from the perspective of a virtual module or a virtual unit, which is described in detail in the following embodiment.

An embodiment of the present application provides a transmitting device 200 of a single-carrier dual-antenna signal under a multipath channel, as shown in fig. 13, the transmitting device 200 may specifically include:

channel coding, constellation modulation module 210: the method comprises the steps of obtaining an information bit stream to be transmitted, and carrying out channel coding and constellation modulation on the information bit stream to be transmitted to obtain a time domain data stream, wherein the time domain data stream comprises a plurality of initial data streams;

a first service data stream determining module 220, configured to insert a plurality of initial data streams into a time slot to obtain a first service data stream;

the FFT module 230 of the transmitter: the method comprises the steps of performing FFT on a first service data stream to obtain a first service data stream in a frequency domain form; STBC coding module 240 of the transmitter: the method comprises the steps of performing STBC coding on a first service data stream in a frequency domain form to obtain a space-time coding matrix;

IFFT module 250 of the transmitter: the method comprises the steps of performing IFFT on a space-time coding matrix to obtain a space-time coding matrix in a time domain form, and dividing the space-time coding matrix in the time domain form into two groups of second service data streams;

The constituent antenna signal modules 260: for inserting pilot frequency before two groups of second service data streams to form antenna signals;

signal transmitting module 270: for transmitting antenna signals from the antenna ports.

Preferably, the STBC coding module 240 of the transmitter is configured to, when performing STBC coding on the first traffic data stream in the frequency domain to obtain the space-time coding matrix:

performing conjugate operation on the first service data stream in the frequency domain form to obtain the first service data stream in the conjugate form;

and forming a space-time coding matrix by the first service data stream in the frequency domain form and the first service data stream in the conjugate form according to space-time orthogonality, wherein the conjugate operation and the data stream orthogonal processing can be performed by using STBC coding.

Preferably, the constituent antenna signal module 260 is configured to, when performing pilot insertion before two sets of second service data streams to form an antenna signal:

and inserting pilot frequency with the first CP before the two groups of second service data streams to form antenna signals.

Preferably, the determining first service data flow module 220 is configured to, when executing inserting a plurality of initial data flows into a timeslot to obtain a first service data flow:

Preferably, the transmitting device 200 of the single-carrier dual-antenna signal under the multipath channel further comprises:

and a filtering module: the method comprises the steps of performing filtering processing on an antenna signal to obtain a filtered antenna signal;

accordingly, the signal transmitting module 270, when performing transmitting the antenna signal from the antenna port, is configured to:

the filtered antenna signal is transmitted from the antenna port.

It will be clear to those skilled in the art that, for convenience and brevity of description, reference may be made to the corresponding procedure in the foregoing method embodiment for the specific operation of the transmitting apparatus 200 for single carrier dual antenna signals under multipath channel.

The foregoing embodiments describe a method for receiving a single-carrier dual-antenna signal under a multipath channel from the perspective of a method flow, and the following embodiments describe a device for receiving a single-carrier dual-antenna signal under a multipath channel from the perspective of a virtual module or a virtual unit, which are described in detail in the following embodiments.

An embodiment of the present application provides a receiving apparatus 300 for a single-carrier dual-antenna signal under a multipath channel, as shown in fig. 14, the receiving apparatus 300 may specifically include:

The signal processing module 310: the method comprises the steps of acquiring antenna signals, and performing FFT according to the antenna signals to obtain frequency domain antenna signals; the data extraction module 320: the method comprises the steps of performing resource demapping according to frequency domain form antenna signals to extract pilot frequency and a third service data stream;

channel estimation, STBC decoding module 330: and the method is used for carrying out channel estimation according to the pilot frequency to obtain a channel response value, and carrying out STBC decoding according to the third service data stream and the channel response value to obtain a fourth service data stream.

Receiver IFFT decoding module 340: the method comprises the steps of performing IFFT according to a fourth service data stream to obtain a fourth service data stream in a time domain form;

constellation mapping, channel decoding module 350: and the method is used for carrying out constellation diagram mapping and channel decoding according to the fourth service data stream to obtain an information bit stream.

Preferably, the fourth service data stream in the time domain form includes a second CP; the constellation mapping and channel decoding module 350 is configured to, when performing constellation mapping and channel decoding on the fourth service data stream according to the time domain form, obtain information bits:

Preferably, the receiving apparatus 300 for single carrier dual antenna signals in multipath channels further comprises:

and the synchronous compensation module is used for: the method is used for carrying out synchronous timing and frequency offset compensation processing on the antenna signals to obtain processed antenna signals; accordingly, the receiver IFFT decoding module 340 is configured to, when performing IFFT according to the fourth service data stream to obtain a fourth service data stream in a time domain form:

and a merging module: the method comprises the steps of after processing a plurality of antennas, merging a plurality of time domain form fourth service data streams corresponding to the plurality of antennas to obtain a merged fourth service data stream;

correspondingly, the constellation diagram mapping and channel decoding module 350 performs second CP removal of the fourth service data stream in the time domain form to obtain a pure fourth service data stream; performing constellation diagram mapping and channel decoding on the pure fourth service data stream to obtain an information bit stream, wherein the information bit stream is used for:

It will be clear to those skilled in the art that, for convenience and brevity of description, the corresponding procedure in the foregoing method embodiment may be referred to for the specific operation of the receiving apparatus 300 for single carrier dual antenna signal under multipath channel.

In an embodiment of the present application, an electronic device, specifically a transmitter or a receiver, as shown in fig. 15, an electronic device 400 shown in fig. 15 includes: a processor 410 and a memory 430. Processor 410 is coupled to memory 430, such as via bus 420. Optionally, the electronic device 400 may also include a transceiver 440. It should be noted that, in practical applications, the transceiver 440 is not limited to one, and the structure of the electronic device 400 is not limited to the embodiment of the present application.

The processor 410 may be a CPU (Central Processing Unit ), general purpose processor, DSP (Digital Signal Processor, data signal processor), ASIC (Application Specific Integrated Circuit ), FPGA (Field Programmable Gate Array, field programmable gate array) or other programmable logic device, transistor logic device, hardware components, or any combination thereof. Which may implement or perform the various exemplary logic blocks, modules and circuits described in connection with this disclosure. Processor 410 may also be a combination that implements computing functionality, e.g., comprising one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.

Bus 420 may include a path to transfer information between the aforementioned components. Bus 420 may be a PCI (Peripheral Component Interconnect, peripheral component interconnect standard) bus, or an EISA (Extended Industry Standard Architecture ) bus, among others. Bus 420 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in fig. 15, but not only one bus or type of bus.

Memory 430 may be, but is not limited to, ROM (Read Only Memory) or other type of static storage device that can store static information and instructions, RAM (Random Access Memory ) or other type of dynamic storage device that can store information and instructions, EEPROM (Electrically Erasable Programmable Read Only Memory ), CD-ROM (Compact Disc Read Only Memory, compact disc Read Only Memory) or other optical disk storage, optical disk storage (including compact discs, laser discs, optical discs, digital versatile discs, blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.

Memory 430 is used to store application code for performing the execution of aspects of the present application and is controlled by processor 410. The processor 410 is configured to execute application code stored in the memory 430 to implement what is shown in the foregoing method embodiments.

Among them, electronic devices include, but are not limited to: mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and the like, and stationary terminals such as digital TVs, desktop computers, and the like. But may also be a server or the like. The electronic device shown in fig. 15 is only an example, and should not impose any limitation on the functions and the scope of use of the embodiments of the present application.

Embodiments of the present application provide a computer readable storage medium having a computer program stored thereon, which when run on a computer, enables the computer to perform the foregoing corresponding content of the transmitting method of a single carrier dual antenna signal under a multipath channel and/or the receiving method embodiment of a single carrier dual antenna signal under a multipath channel.

It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein. Moreover, at least some of the steps in the flowcharts of the figures may include a plurality of sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order of their execution not necessarily being sequential, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.

The foregoing is only a partial embodiment of the present application, and it should be noted that it will be apparent to those skilled in the art that modifications and adaptations can be made without departing from the principles of the present application, and such modifications and adaptations should and are intended to be comprehended within the scope of the present application.

Claims

1. A method for transmitting a single carrier dual antenna signal in a multipath channel, comprising:

Transmitting the antenna signal from an antenna port;

the step of performing STBC coding on the first service data stream in the frequency domain form to obtain a space-time coding matrix comprises the following steps:

2. The method for transmitting a single carrier dual antenna signal under a multipath channel according to claim 1, wherein said inserting pilots before said two sets of second traffic data streams forms an antenna signal, comprising:

3. The method for transmitting a single carrier dual antenna signal under a multipath channel according to claim 2, wherein said inserting a plurality of said initial data streams into a time slot results in a first traffic data stream, comprising:

4. A method of transmitting a single carrier dual antenna signal in a multipath channel as claimed in any one of claims 1 to 3, further comprising, after forming the antenna signal:

filtering the antenna signal to obtain a filtered antenna signal;

and transmitting the filtered antenna signal from an antenna port.

5. A method for receiving a single carrier dual antenna signal in a multipath channel, comprising:

acquiring an antenna signal, and performing FFT according to the antenna signal to obtain an antenna signal in a frequency domain form; the antenna signal is obtained by inserting a plurality of initial data streams into a time slot; performing FFT on the first service data stream to obtain a first service data stream in a frequency domain form; performing STBC coding on the first service data stream in the frequency domain form to obtain a space-time coding matrix, wherein the performing STBC coding on the first service data stream in the frequency domain form to obtain the space-time coding matrix comprises the following steps: performing conjugate operation on the first service data stream in the frequency domain form to obtain a first service data stream in a conjugate form; forming the space-time coding matrix by the first service data stream in the frequency domain form and the first service data stream in the conjugate form according to space-time orthogonality, wherein conjugate operation and data stream orthogonal processing can be performed by using the STBC coding; performing IFFT on the space-time coding matrix to obtain a space-time coding matrix in a time domain form, and dividing the space-time coding matrix in the time domain form into two groups of second service data streams; the pilot frequency is inserted before the two groups of second service data flows;

channel estimation is carried out according to the pilot frequency to obtain a channel response value, and the channel response value is obtained according to the third service data stream and the signalPerforming STBC decoding on the channel response value to obtain a fourth service data stream; wherein the fourth service data stream obtained after STBC decoding is X1 and X2, and the expression form is thatW represents the optimal matched filter coefficient, and the third service data streams received by the receiving antenna are Y respectively ₁₁ ，Y ₁₂ ，Y ₁₂ ^* Is Y ₁₂ Taking a conjugated form;

6. The method for receiving a single carrier dual antenna signal in a multipath channel according to claim 5, wherein the fourth traffic data stream in time domain form comprises a second CP;

performing constellation diagram mapping and channel decoding according to the fourth service data stream in the time domain form to obtain an information bit stream, including: removing the second CP of the fourth service data stream in the time domain form to obtain a pure fourth service data stream;

7. The method for receiving a single carrier dual antenna signal in a multipath channel as claimed in claim 6, further comprising, after said acquiring the antenna signal:

8. The method for receiving a single carrier dual-antenna signal in a multipath channel according to claim 7, wherein after performing IFFT according to the fourth service data stream to obtain a fourth service data stream in a time domain form, further comprising:

correspondingly, the second CP of the fourth service data stream in the time domain form is removed, and a pure fourth service data stream is obtained; performing constellation diagram mapping and channel decoding on the clean fourth service data stream to obtain an information bit stream, wherein the method comprises the following steps:

9. An electronic device, comprising:

at least one processor;

a memory;

at least one application program, wherein the at least one application program is stored in the memory and configured to be executed by the at least one processor, the at least one application program configured to: performing the method of any one of claims 1-4 and/or 5-8.