High-spectral-effect signal flexible transmission method and system based on carrier slicing

Abstract

The invention discloses a high-spectrum-effect signal flexible transmission method and system based on carrier slicing, and belongs to the technical field of communication. The method comprises the following steps: slicing a subcarrier; dividing an original data stream into index bits and sign bits and carrying out serial-to-parallel conversion; the index bit selects the activated subcarrier position in the subcarrier slice; the symbol bits are mapped on the activated subcarriers and the non-activated subcarriers by adopting different mapping schemes; carrying out IFFT (Inverse Fast Fourier Transform) to obtain a time domain signal, adding a cyclic prefix and a cyclic suffix, and carrying out parallel-serial conversion; receiving the signal by a receiving end, removing cyclic prefix and suffix and FFT (Fast Fourier Transform) through serial-to-parallel conversion, and recovering the signal into a frequency domain signal; identifying the activation state of each subcarrier through demodulation, and extracting index bits; carrying out QPSK (Quadrature Phase Shift Keying) demodulation, and restoring symbol bits according to a corresponding QPSK mapping scheme; the index bits and the symbol bits are merged through parallel-serial conversion, and the original data stream is recovered. By slicing the subcarriers and combining index modulation, the transmission rate is dynamically adjusted under the condition that the transmitting power and the bandwidth are not increased.

Description

Technical Field

[0001] This invention belongs to the field of communication technology, specifically relating to a flexible transmission method and system for high spectral efficiency signals based on carrier slicing. Background Technology

[0002] With the continuous evolution of 5G-Advanced (5G-A), the Internet of Things (IoT), and high-speed optical communication technologies, the types of services carried by networks are becoming increasingly diversified. From real-time interaction and high-definition video to various application scenarios such as the Industrial Internet of Things (IIoT), higher demands are being placed on data transmission rates and dynamic adaptability. Modern communication systems, including wireless and wired transmission technologies, have become the core transmission carriers supporting modern information infrastructure due to their ultra-high transmission rates, extremely low signal loss, and huge bandwidth potential. At the same time, the rapid development of artificial intelligence technologies, represented by large-scale models, is placing unprecedentedly stringent demands on the data throughput efficiency, transmission reliability, and latency control of the underlying computing infrastructure. Against this backdrop, communication systems are facing increasingly severe challenges in terms of capacity, rate, and reliability, urgently requiring further breakthroughs in system performance through new modulation and resource regulation technologies.

[0003] Orthogonal Frequency Division Multiplexing (OFDM) technology has been widely used in wireless and optical communication systems due to its high spectral efficiency and excellent resistance to multipath fading. OFDM effectively utilizes spectrum resources and significantly reduces inter-symbol interference by dividing a wideband channel into multiple mutually orthogonal narrowband subcarriers. However, traditional OFDM systems typically employ fixed modulation formats such as Quadrature Phase Shift Keying (QPSK) and 16th-order Quadrature Amplitude Modulation (16QAM), where all subcarriers are activated and carry data symbols in the same way, lacking dynamic response capabilities to different channel states and service requirements. While this "fully activated" mode is simple to implement, it struggles to achieve optimal resource allocation when facing fluctuating channel conditions or diverse service scenarios. Especially in optical communication systems, with increasingly complex service types and higher demands for transmission rate flexibility, the shortcomings of traditional OFDM in subcarrier state control are becoming increasingly apparent, limiting further improvements in energy efficiency, spectral efficiency, and adaptive capabilities. Therefore, introducing a more flexible and refined subcarrier control mechanism while maintaining the advantages of OFDM has become one of the important directions for optimizing current optical communication systems.

[0004] To improve system flexibility and energy efficiency, Index Modulation (IM) technology has emerged. In traditional OFDM-IM schemes, some subcarriers are selected to be active and transmit modulation symbols, while others remain silent (i.e., transmit at zero power). The position information of these silent subcarriers is used to carry additional index bits, thereby increasing the dimensionality of information transmission without increasing transmit power and bandwidth. However, OFDM-IM schemes have an inherent drawback: the selected silent subcarriers do not carry any actual data symbols, resulting in a waste of subcarrier resources. Especially under good channel conditions, this "resource idleness" limits further improvement in system spectral efficiency. Essentially, this is a scheme that sacrifices some frequency resources for index information transmission. Therefore, a mechanism is needed to dynamically adjust the subcarrier activation state and modulation mode to achieve a transmission scheme with flexible and adjustable rate and synergistic optimization of spectral and energy efficiency. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a flexible transmission method and system for high spectral efficiency signals based on carrier slicing, thereby solving the problems in the prior art.

[0006] The objective of this invention can be achieved through the following technical solutions: A flexible method for high spectral efficiency signal transmission based on carrier slicing includes: The subcarriers are sliced ​​to divide them into multiple subcarrier slices; The original data stream is divided into index bits and symbol bits, and a serial-to-parallel transformation is performed. The index bits select the active subcarrier positions in the subcarrier slice. Based on the index bit selection results, the symbol bits perform constellation point mapping on the active and inactive subcarriers using different QPSK mapping schemes. The mapped constellation points are assigned to the corresponding subcarriers to form a frequency domain signal. The frequency domain signal is transformed into a time domain signal by inverse fast Fourier transform, and then subjected to cyclic prefix and suffix addition and parallel-to-serial transformation before being sent into the channel for transmission. The receiving end receives the signal and sequentially performs serial-to-parallel conversion, removal of cyclic prefixes and suffixes, and fast Fourier transform to restore it to the frequency domain signal; The frequency domain signal is demodulated through a mapping mode to identify the activation state of each subcarrier and extract the index bits; then it is demodulated by QPSK to restore the symbol bits according to the corresponding QPSK mapping scheme. The index bits and symbol bits are combined through parallel-to-serial conversion to restore the original data stream.

[0007] Furthermore, when slicing subcarriers, different grouping strategies are used to change the selection combination of active subcarriers in each slice, and the number of index bits is dynamically adjusted.

[0008] Furthermore, the activated subcarriers are mapped using the QPSK-B mapping scheme, while the inactive subcarriers are mapped using the QPSK-A mapping scheme.

[0009] Furthermore, when the number of subcarriers is odd, the last column of individual subcarriers is not indexed and is mapped using the QPSK-A mapping scheme.

[0010] Furthermore, the index bits and the symbol bits undergo serial-to-parallel transformation to convert the serial data stream into: a parallel matrix controlling the activation positions and a parallel matrix for carrying the data, respectively.

[0011] Furthermore, during demodulation, the process of extracting the index bits and restoring the symbol bits includes: Within each subcarrier slice, the Euclidean distance between all received constellation points and the constellation points defined in the QPSK-B mapping is calculated. The subcarrier point with the smallest distance is selected and determined as the active position in the current subcarrier slice. It is then determined as the corresponding QPSK-B constellation point, thereby simultaneously determining the index bit and the symbol bit at that position. For the remaining inactive subcarrier points in the subcarrier slice, the distance is compared with each constellation point in the QPSK-A mapping, and each point is determined as the QPSK-A constellation point with the smallest Euclidean distance, thereby recovering all symbol bits.

[0012] A flexible high-spectral-efficiency signal transmission system based on carrier slicing includes: Slicing module: The subcarrier is sliced ​​at the transmitting end, dividing it into multiple subcarrier slices; Data packet mapping module: Divides the original data stream into index bits and symbol bits, and performs serial-to-parallel conversion; the index bits select the active subcarrier position in the subcarrier slice; according to the index bit selection result, the symbol bits perform constellation point mapping on the active and inactive subcarriers using different QPSK mapping schemes respectively, and the mapped constellation points are assigned to the corresponding subcarriers to form frequency domain signals. Signal transformation module: The frequency domain signal is transformed into a time domain signal through inverse fast Fourier transform, and then subjected to cyclic prefix and suffix addition and parallel-to-serial transformation before being sent into the channel for transmission; Signal inverse transformation module: The receiver receives the signal and sequentially performs serial-to-parallel transformation, removal of cyclic prefixes and suffixes, and fast Fourier transform to restore it to the frequency domain signal; Signal demodulation module: The frequency domain signal is demodulated through mapping mode, the activation state of each subcarrier is identified, and the index bits are extracted; then it is demodulated by QPSK, and the symbol bits are restored according to the corresponding QPSK mapping scheme; Data recovery module: The index bits and symbol bits are combined through parallel-to-serial conversion to restore the original data stream.

[0013] A computer storage medium storing a readable program that, when executed, instructs a computing device to perform a flexible transmission method for high spectral efficiency signals based on carrier slicing, as described above.

[0014] An electronic device includes: a processor, a memory, a communication interface, and a communication bus, wherein the processor, the memory, and the communication interface communicate with each other through the communication bus; The memory is used to store at least one executable instruction, which causes the processor to perform an operation corresponding to the above-described method for flexible transmission of high spectral efficiency signals based on carrier slicing.

[0015] A computer program product includes computer instructions that instruct a computing device to perform operations corresponding to the above-described flexible transmission method for high spectral efficiency signals based on carrier slicing.

[0016] The beneficial effects of this invention are: 1. This invention introduces a dynamic subcarrier slicing mechanism, flexibly dividing N subcarriers into G slices, each slice containing several subcarriers. By adjusting the grouping strategy, the number of index bits that can be carried in each subcarrier slice can be changed, thereby achieving flexible adjustment of the system transmission rate. Furthermore, in each subcarrier group, K subcarriers are selected as active states and modulated using mapping scheme B, while the remaining subcarriers are inactive states and modulated using mapping scheme A, effectively improving the system's spectrum utilization. This invention proposes a constellation mapping optimization design, controlling the occurrence probability of different mapping modes through index bits. Mapping scheme A, with a high occurrence probability, is configured as a contracted low-energy constellation point, while mapping scheme B, with a low occurrence probability, is configured as an expanded high-energy constellation point. By optimizing the distribution structure of the two constellation diagrams, the average transmit power is significantly reduced while ensuring transmission performance. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1This is a flowchart of the transmission method of the present invention; Figure 2 This is the dual-mode constellation mapping rule table of the present invention; Figure 3 This is a schematic diagram of the non-slicing single-mode mapping of the present invention; Figure 4 This is a schematic diagram of the dual-mode mapping of slices 16, 4, and 1 in this invention; Figure 5 This is a schematic diagram of the dual-mode mapping of slices 8, 4, 4, 4, 1 in this invention; Figure 6 This is the dual-mode indexed modulation constellation diagram of the present invention; Figure 7 This is the constellation probability distribution diagram of the present invention; Figure 8 This is the receiver constellation diagram of the present invention; Figure 9 This is a graph showing the bit error rate under different signal-to-noise ratios according to the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1 like Figure 1 As shown, a flexible transmission method for high spectral efficiency signals based on carrier slicing includes the following steps: S1, the subcarrier is sliced ​​at the transmitting end, and multiple subcarrier slices are divided; To achieve flexible and adjustable transmission rates, this invention introduces a carrier slicing mechanism. By dynamically slicing the total subcarriers, the number of index bits can be varied under different slicing strategies, thereby controlling the overall system transmission rate. Specifically, based on channel conditions or service requirements, all subcarriers are divided into G slices, each containing several subcarriers. Under different grouping configurations, the number of index bits that each group can carry varies, thus affecting the overall spectral efficiency of the system.

[0021] To illustrate the implementation and effectiveness of this mechanism, this embodiment uses a total of 21 subcarriers as an example and designs three typical slicing strategies for comparative analysis: 1) The first scheme does not perform slicing, that is, the 21 subcarriers are treated as a whole. At this time, the entire system is in an inactive mode and index modulation is not introduced. 2) The second slicing scheme divides the subcarriers into 3 groups: the first group has 16 subcarriers, the second group has 4 subcarriers, and the third group has a single subcarrier. 3) The third slicing scheme further refines the grouping, dividing the subcarriers into five groups, including the first group of 8 subcarriers, the second group of 4 subcarriers, the third group of 4 subcarriers, the fourth group of 4 subcarriers, and the fifth group of 1 subcarrier.

[0022] The following section compares these three slicing schemes to clearly demonstrate the impact of subcarrier slicing on system transmission capacity and flexibility.

[0023] S2, the original data stream is divided into index bits and symbol bits, and serial-to-parallel conversion is performed; the index bits select the position of the activated subcarrier in the subcarrier slice; according to the result of the index bit selection, the symbol bits use different QPSK mapping schemes to map constellation points on the activated and inactive subcarriers respectively, and the mapped constellation points are assigned to the corresponding subcarriers to form the mapped frequency domain signal. The original data stream is a randomly generated binary data stream representing information from different users. In this embodiment, 57,120 bits are used as an example.

[0024] (1) The process of dividing the original data stream is as follows: The original binary bitstream is divided into two paths: one for index bits and the other for symbol bits. The index bits determine the mapping rule for symbols on the subcarriers. In this embodiment, both mapping modes use QPSK modulation. One subcarrier is selected to activate each slice. The activated subcarrier is mapped using the QPSK-B mapping scheme, while unselected subcarriers are mapped using the QPSK-A mapping scheme. Since there are an odd number of subcarriers, the last column of subcarriers is not indexed and is mapped using the QPSK-A scheme by default. The QPSK-A and QPSK-B mapping schemes are as follows: Figure 2 As shown, QPSK-A uses low-power concave constellation points, while QPSK-B uses high-power convex constellation points. This design, combined with indexed modulation, naturally creates probabilistic shaping: high-probability inactive carriers use low-power QPSK-A, and low-probability active carriers use high-power QPSK-B, thus significantly reducing the system's average transmit power.

[0025] In the first slicing scheme, all binary bits are used for symbol mapping, without index modulation. Therefore, in the first scheme, the total number of transmitted bits per OFDM symbol is... , Figure 3The diagram shows a single-mode mapping without slicing. It can be seen that all binary bits are QPSK modulated, with each symbol carrying 2 bits. This scheme is used as a baseline case, and its transmission capacity will be compared with the subsequent slicing scheme using index modulation.

[0026] In the second and third slicing schemes, each slice selects one subcarrier for activation. In the second slicing scheme, there are 16 possible positions for the activated subcarriers in the first group of slices, and 4 possible positions for the activated subcarriers in the second group of slices. Therefore, in the second scheme, the number of index bits that can transmit information is... The total number of transmitted bits is . Figure 4 The diagram below illustrates the dual-mode mapping for the second slicing scheme. It shows that in the second scheme, 6 / 48 bits of the original data are used for index modulation during grouping, and only 42 / 48 bits of the original data need to be transmitted on the subcarrier.

[0027] Similarly, the third slicing scheme can transmit the information of the index bits as follows: The total number of transmitted bits is In the third scheme, 9 / 51 bits of the original data are used for index modulation, and only 42 / 51 bits of the original data are used for transmission on the subcarrier. Figure 5 This is a schematic diagram of the dual-mode mapping for the third slicing scheme; by Figure 5 It is evident that, with a fixed number of subcarriers, different slicing schemes result in different index gains. When the number of subcarriers is 21 and QPSK modulation is selected, compared to a single-mode mapped subcarrier without slicing, the 16, 4, and 1 subcarrier slicing schemes can transmit 6 more bits of index information per OFDM symbol, increasing the transmission capacity by 14.2% under the same subcarrier conditions. Conversely, the 8, 4, 4, and 1 subcarrier slicing schemes can transmit 9 more bits of index information per OFDM symbol, increasing the transmission capacity by 21.4% under the same subcarrier conditions. Therefore, it can be seen that flexible slicing of subcarrier blocks allows for dynamic adjustment of the transmission rate.

[0028] In this embodiment, the 8, 4, 4, 4, 1 scheme (the third slicing scheme) is selected for simulation verification. The binary bit stream used for index bits is divided into the same groups as the binary bit stream used for symbol mapping. Each group of index bits controls the activation position on each group of subcarriers, i.e., the mapping rule.

[0029] (2) Serial-to-parallel transformation; The index bits and symbol bits undergo serial-to-parallel conversion to transform the serial data stream into a parallel data stream to adapt to the parallel structure of the subcarrier; the symbol bits are transformed into a parallel matrix to carry the data, and the index bits are transformed into a parallel matrix to control the activation position.

[0030] Specifically: Because this embodiment selected the third slicing scheme for verification, the binary data stream in the symbol bits was transformed from the original 1×47040 matrix into a 2240×21 matrix. Then, the 2240×21 matrix was divided into quaternary groups, becoming an 1120×21 matrix. The binary data stream in the index bits was transformed from the original 1×10080 matrix into an 1120×9 matrix.

[0031] (3) Zodiac point mapping The minimum Euclidean distance between constellation points directly affects the system's bit error rate (BER). To maintain a good BER, the minimum Euclidean distance between the QPSK-A and QPSK-B mapping modes should be equal to the minimum Euclidean distance between QPSK-A and QPSK-B themselves. Therefore, when designing constellation points, QPSK-A and QPSK-B can be mapped as a whole, and then the two mapping modes can be separated. Furthermore, because the QPSK-A mapping has a higher probability of occurrence, QPSK-A constellation points are preferentially placed inside the system during design, while QPSK-B constellation points, which have a lower probability of occurrence, are placed outside. Figure 6 This is a constellation diagram for a dual-mode indexed modulation scheme. Figure 6 It can be seen that the four constellation points of QPSK-B are placed on the outside, while the four constellation points of QPSK-A are placed on the inside.

[0032] The constellation probability distribution of the dual-mode indexed modulation scheme is as follows: Figure 7 As shown, it can be seen that since only a small number of modes are activated in each subcarrier slice and are mapped through QPSK-B, the probability of external constellation points of QPSK-B appearing is low in the constellation diagram, while the probability of internal constellation points of QPSK-A appearing is high.

[0033] S3, the mapped frequency domain signal is transformed into a time domain signal by inverse fast Fourier transform (IFFT), and then subjected to cyclic prefix and suffix addition and parallel-to-serial transformation before finally being sent into the channel for transmission. (1) Inverse Fast Fourier Transform (IFFT) Each constellation point can be represented by adding a real part and an imaginary part. After IFFT, the frequency domain signal is converted into a time domain signal, and the matrix at this time is 1120×1024.

[0034] (2) Add a loop prefix and suffix In this embodiment, to reduce interference between symbols, a cyclic prefix and a suffix are added before and after the symbols. The length of the cyclic prefix is ​​256, and the length of the suffix is ​​40.

[0035] (3) Parallel-to-serial transformation The modulated parallel time-domain signal is converted into a serial data stream, ready to be sent into the channel. In this embodiment, the original 1120×1024 signal matrix is ​​transformed into a 1120×1320 signal matrix by adding a cyclic prefix of length 256 and a cyclic suffix of length 40. The modulated 1120×1320 parallel time-domain signal is then transformed into a 1×1478400 matrix for transmission.

[0036] In this embodiment, by adding Gaussian white noise, the effects of thermal noise, photon noise, line noise, and external interference on the signal during actual transmission are simulated. S4. At the receiving end, the received signal is sequentially converted from serial to parallel, cyclic prefix and suffix removed, and then subjected to Fast Fourier Transform (FFT) to recover the frequency domain signal. The receiving signal is processed in reverse at the receiving end: after serial-to-parallel conversion, removal of cyclic prefixes and suffixes, and Fourier transform, a 1120×21 matrix representation of the frequency domain signal is obtained. The receiver constellation diagram is as follows. Figure 8 As shown, it can be seen that under the influence of noise, the constellation points at the receiver surround the constellation points defined by QPSK-A and QPSK-B.

[0037] S5, the frequency domain signal is demodulated through the mapping mode to identify the activation state of each subcarrier and extract the index bits; then it is demodulated by QPSK to restore the symbol bits according to the corresponding QPSK mapping scheme; The process of extracting the index bits and restoring the sign bits includes: During demodulation at the receiver, firstly, within each subcarrier slice, the Euclidean distance of all received constellation points is calculated with the four constellation points defined in the QPSK-B mapping. The subcarrier point with the smallest distance is selected as the active position in the current subcarrier slice and directly designated as the corresponding QPSK-B constellation point, thereby simultaneously determining the index bit and the symbol bit at that position. For the remaining inactive subcarrier points in the subcarrier slice, the distance is compared with each constellation point in the QPSK-A mapping, and each point is designated as the QPSK-A constellation point with the smallest Euclidean distance, thus recovering all the symbol bits.

[0038] Figure 9The figure shows the bit error rate (BER) curves for two slicing modes: 16, 4, 1 and 8, 4, 4, 4, 1. It can be seen that both slicing modes exhibit good noise immunity; at an SNR of -7, the BER for both modes is below 8%. Furthermore, when the SNR is greater than -1, the BER for both modes is 0. Compared to the 16, 4, 1 slicing mode, the 8, 4, 4, 4, 1 slicing mode offers a 7% increase in transmission rate, while its BER only increases by 2% at an SNR of -7. By optimizing the receiver's decoding rules, the BER difference can be further reduced. Simulations verify the feasibility of achieving high spectral efficiency and flexible transmission rates based on subcarrier slicing technology.

[0039] S6, the index bits and symbol bits are combined through parallel-to-serial transformation to restore the original binary data stream.

[0040] Based on a similar inventive concept, embodiments of the present invention also provide a computer storage medium storing a readable program that, when run by a processor, can execute the above-described method for flexible transmission of high spectral efficiency signals based on carrier slicing.

[0041] Based on a similar inventive concept, this invention provides an electronic device, including: a processor, a memory, a communication interface, and a communication bus, wherein the processor, the memory, and the communication interface communicate with each other through the communication bus; The memory is used to store at least one executable instruction, which causes the processor to perform the operation corresponding to the above-described flexible transmission method for high spectral efficiency signals based on carrier slicing.

[0042] Based on a similar inventive concept, embodiments of the present invention also provide a computer program product, including computer instructions, which instruct a computing device to perform the operations corresponding to the above-described flexible transmission method for high spectral efficiency signals based on carrier slicing.

[0043] Example 2 A flexible high-spectral-efficiency signal transmission system based on carrier slicing, specifically comprising: Slicing module: The subcarrier is sliced ​​at the transmitting end, dividing it into multiple subcarrier slices; Data packet mapping module: Divides the original data stream into index bits and symbol bits, and performs serial-to-parallel conversion; the index bits select the active subcarrier position in the subcarrier slice; according to the index bit selection result, the symbol bits use different QPSK mapping schemes to map constellation points on the active and inactive subcarriers respectively, and the mapped constellation points are assigned to the corresponding subcarriers to form the mapped frequency domain signal. Signal transformation module: The mapped frequency domain signal is transformed into a time domain signal through inverse fast Fourier transform, and then subjected to cyclic prefix and suffix addition and parallel-to-serial transformation before finally being sent into the channel for transmission. Inverse signal transformation module: At the receiving end, the received signal undergoes serial-to-parallel transformation, removal of cyclic prefixes and suffixes, and fast Fourier transform in sequence to restore it to the frequency domain signal; Signal demodulation module: The frequency domain signal is demodulated through the mapping mode, the activation state of each subcarrier is identified, and the index bits are extracted; then it is demodulated by QPSK, and the symbol bits are restored according to the corresponding QPSK mapping scheme. Data recovery module: The index bits and symbol bits are combined through parallel-to-serial conversion to restore the original data stream.

[0044] The methods of the present invention can be implemented in hardware, firmware, or as software or computer code that can be stored in a recording medium (such as a CD-ROM, RAM, floppy disk, hard disk, or magneto-optical disk), or as computer code originally stored on a remote recording medium or a non-transitory machine-readable medium and subsequently stored on a local recording medium, downloaded via a network. Thus, the methods described herein can be processed by software stored on a recording medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware (such as an ASIC or FPGA). It is understood that the computer, processor, microprocessor controller, or programmable hardware includes storage components (e.g., RAM, ROM, flash memory, etc.) capable of storing or receiving software or computer code that, when accessed and executed by the computer, processor, or hardware, implements the methods described herein. Furthermore, when a general-purpose computer accesses the code used to implement the methods shown herein, the execution of the code transforms the general-purpose computer into a dedicated computer for performing the methods shown herein.

[0045] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A flexible transmission method for high spectral efficiency signals based on carrier slicing, characterized in that, include: The subcarriers are sliced ​​to divide them into multiple subcarrier slices; The original data stream is divided into index bits and symbol bits, and then serial-to-parallel conversion is performed; The index bits select the position of the activated subcarrier in the subcarrier slice; based on the result of the index bit selection, the symbol bits perform constellation point mapping on the activated and inactive subcarriers using different QPSK mapping schemes respectively. The mapped constellation points are assigned to the corresponding subcarriers to form a frequency domain signal. The frequency domain signal is transformed into a time domain signal by inverse fast Fourier transform, and then subjected to cyclic prefix and suffix addition and parallel-to-serial transformation before being sent into the channel for transmission. The receiving end receives the signal and sequentially performs serial-to-parallel conversion, removal of cyclic prefixes and suffixes, and fast Fourier transform to restore it to the frequency domain signal; The frequency domain signal is demodulated through a mapping mode to identify the activation state of each subcarrier and extract the index bits; then it is demodulated by QPSK to restore the symbol bits according to the corresponding QPSK mapping scheme. The index bits and symbol bits are combined through parallel-to-serial conversion to restore the original data stream.

2. The method for flexible transmission of high spectral efficiency signals based on carrier slicing according to claim 1, characterized in that, When slicing subcarriers, different grouping strategies are used to change the selection combination of active subcarriers in each slice, and the number of index bits is dynamically adjusted.

3. The method for flexible transmission of high spectral efficiency signals based on carrier slicing according to claim 1, characterized in that, The activated subcarriers are mapped using the QPSK-B mapping scheme, while the inactive subcarriers are mapped using the QPSK-A mapping scheme.

4. The method for flexible transmission of high spectral efficiency signals based on carrier slicing according to claim 1, characterized in that, When the number of subcarriers is odd, the last column of individual subcarriers is not indexed and is mapped using the QPSK-A mapping scheme.

5. The method for flexible transmission of high spectral efficiency signals based on carrier slicing according to claim 1, characterized in that, The index bits and the symbol bits undergo serial-to-parallel transformation to convert the serial data stream into: a parallel matrix controlling the activation position and a parallel matrix for carrying the data.

6. The method for flexible transmission of high spectral efficiency signals based on carrier slicing according to claim 1, characterized in that, During demodulation, the process of extracting the index bits and restoring the symbol bits includes: Within each subcarrier slice, the Euclidean distance between all received constellation points and the constellation points defined in the QPSK-B mapping is calculated. The subcarrier point with the smallest distance is selected and determined as the active position in the current subcarrier slice. It is then determined as the corresponding QPSK-B constellation point, thereby simultaneously determining the index bit and the symbol bit at that position. For the remaining inactive subcarrier points in the subcarrier slice, the distance is compared with each constellation point in the QPSK-A mapping, and each point is determined as the QPSK-A constellation point with the smallest Euclidean distance, thereby recovering all symbol bits.

7. A flexible high-spectral-efficiency signal transmission system based on carrier slicing, capable of performing the method according to any one of claims 1-6, characterized in that, include: Slicing module: The subcarrier is sliced ​​at the transmitting end, dividing it into multiple subcarrier slices; Data packet mapping module: Divides the original data stream into index bits and symbol bits, and performs serial-to-parallel conversion; The index bits select the position of the activated subcarrier in the subcarrier slice; based on the result of the index bit selection, the symbol bits perform constellation point mapping on the activated and inactive subcarriers using different QPSK mapping schemes respectively. The mapped constellation points are assigned to the corresponding subcarriers to form a frequency domain signal. Signal transformation module: The frequency domain signal is transformed into a time domain signal through inverse fast Fourier transform, and then subjected to cyclic prefix and suffix addition and parallel-to-serial transformation before being sent into the channel for transmission; Signal inverse transformation module: The receiver receives the signal and sequentially performs serial-to-parallel transformation, removal of cyclic prefixes and suffixes, and fast Fourier transform to restore it to the frequency domain signal; Signal demodulation module: The frequency domain signal is demodulated through mapping mode, the activation state of each subcarrier is identified, and the index bits are extracted; then it is demodulated by QPSK, and the symbol bits are restored according to the corresponding QPSK mapping scheme; Data recovery module: The index bits and symbol bits are combined through parallel-to-serial conversion to restore the original data stream.

8. A computer storage medium storing a readable program, characterized in that, When the program is run, it can instruct the computing device to execute a flexible transmission method for high spectral efficiency signals based on carrier slicing as described in any one of claims 1-6.

9. An electronic device, characterized in that, include: The processor, memory, communication interface, and communication bus are provided, wherein the processor, memory, and communication interface communicate with each other via the communication bus. The memory is used to store at least one executable instruction, which causes the processor to perform the operation corresponding to the flexible transmission method for high spectral efficiency signals based on carrier slicing as described in any one of claims 1-6.

10. A computer program product comprising computer instructions, characterized in that, The computer instructions instruct the computing device to perform the operation corresponding to the flexible transmission method for high spectral efficiency signals based on carrier slicing as described in any one of claims 1-6.

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