Terminal dual-mode communication adaptive modulation method and device based on OFDM, computer equipment and storage medium

Abstract

The invention relates to a terminal dual-mode communication adaptive modulation method and device based on OFDM, computer equipment and a storage medium, the method is applied to a sending end of electric power communication, and the method comprises the following steps: obtaining an interference sensing matrix according to a frequency domain interference component, a phase interference component and a time domain interference component; according to the interference sensing matrix, a to-be-scheduled service priority queue and constraint conditions, resource blocks are allocated to the to-be-scheduled service; and when the trigger condition is monitored, adaptively carrying out re-modulation and frequency division on the physical layer signal and sending the physical layer signal to a receiving end. According to the invention, frequency band interference can be avoided during power communication.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of communication, and in particular to a terminal dual-mode communication adaptive modulation method and device based on OFDM, a computer device and a storage medium. BACKGROUND

[0002] Orthogonal Frequency Division Multiplexing (OFDM) technology has become the core technology of the physical layer of power line carrier communication (PLC) and 230MHz wireless private network and other power communication systems due to its high spectral efficiency and anti-multipath fading capability.

[0003] However, the sensitivity of OFDM technology to carrier frequency offset (CFO) and phase noise is its inherent defect, which is dramatically amplified in complex power transmission scenarios and becomes a bottleneck restricting system reliability.

[0004] The physical root cause of the inherent defect of OFDM technology is that the orthogonality between subcarriers is easily destroyed. To solve the above problem, the existing technology mainly follows the technical route of "static resource configuration and parameterized passive compensation". Specifically, in the resource configuration layer, a fixed pilot coding pattern is used for channel estimation, and static or semi-static resource block allocation is used. This configuration lacks spatial and temporal targeting, and when encountering sudden and high-power impulse noise caused by power equipment operation, the pilot signal is easily submerged, leading to inaccurate channel estimation, and thus the subsequent compensation algorithms such as equalization fail.

[0005] Therefore, in the scenario of power communication, the traditional OFDM system has serious robustness problems when facing fast time-varying composite interference, and it is difficult to meet the stringent requirements of smart grid and other applications for communication reliability. SUMMARY

[0006] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a terminal dual-mode communication adaptive modulation method, device, computer device and storage medium based on OFDM.

[0007] In a first aspect, the present application provides a terminal dual-mode communication adaptive modulation method based on OFDM, which is applied to the sending end of power communication, and the method comprises: obtaining an interference awareness matrix according to the frequency domain interference component, the phase interference component and the time domain interference component; allocating resource blocks to be scheduled according to the interference awareness matrix, the priority queue of the business to be scheduled and the constraint condition; When a trigger condition is monitored, the physical layer signal is adaptively remodulated and frequency-divided and sent to a receiving end.

[0008] Optionally, the obtaining of the interference awareness matrix according to the frequency domain interference component, the phase interference component and the time domain interference component comprises: The deviation of the received power of each subcarrier in the current OFDM symbol block from the ideal power is obtained to obtain the frequency domain interference component, or The narrowband interference subcarrier or the deep fading subcarrier is obtained according to the variance of the received power of each subcarrier in the current OFDM symbol block among continuous multiple symbols to obtain the frequency domain interference component. The phase of the pilot symbol is extracted, the error of the phase of the pilot symbol from the ideal phase is obtained as a first error, and the variance of the first error within one OFDM symbol block is obtained as the phase interference component. The short-term error code statistics or soft decision noise ratio reported is exponentially weighted moving average filtered to obtain an index reflecting the time-varying stability of the channel after smoothing the instantaneous fluctuation, and the index is taken as the time domain interference component. The frequency domain interference component, the phase interference component and the time domain interference component are confidence evaluated based on the instantaneous signal-to-noise ratio and the historical statistics. According to the results of the confidence evaluation, the interference weight values of each interference component are obtained. According to the frequency domain interference component, the phase interference component, the time domain interference component and the interference weight values of each interference component, the interference awareness matrix is obtained.

[0009] Optionally, after obtaining the interference weight values of each interference component according to the results of the confidence evaluation, and before obtaining the interference awareness matrix, the method further comprises: When the instantaneous signal-to-noise ratio of multiple continuous sampling time instants of any interference component is lower than a preset threshold, the interference weight value of the any interference component is reduced by a preset step size.

[0010] Optionally, the allocating of the resource block to the service according to the interference awareness matrix, the priority queue of the service to be scheduled and the constraint condition comprises: The service to be scheduled is sorted according to the priority from high to low to obtain the priority queue of the service to be scheduled. The comprehensive cost matrix is obtained according to the interference awareness matrix, the signal-to-noise ratio cost factor, the service priority cost factor, the spectrum efficiency cost factor and the orthogonality protection cost factor. Under the constraint condition, the resource block with the minimum cost is obtained from the resource pool according to the comprehensive cost matrix, and is allocated to the first service to be scheduled in the priority queue of the service to be scheduled. removing the allocated resource blocks from the resource pool, and removing the pending services with the allocated resource blocks from the pending service priority queue; allocating the corresponding minimum cost resource blocks to each of the pending services in the pending service priority queue until there is no pending service in the scheduled service priority queue; mapping the corresponding relationship between the pending services and the resource blocks as a resource sub-carrier mapping scheme.

[0011] Optionally, according to the interference awareness matrix, the signal-to-noise ratio cost factor, the service priority cost factor, the spectrum efficiency cost factor, and the orthogonality protection cost factor, a comprehensive cost matrix is obtained, and the comprehensive cost matrix is obtained in the following manner: the comprehensive cost matrix, the interference awareness matrix, the service priority cost factor, the signal-to-noise ratio cost factor, the spectrum efficiency cost factor, 、 、 and the cost weight value.

[0012] Optionally, the triggering condition includes interference change or performance degradation. The adaptive adjustment of the physical layer signal structure and the sending to the receiving end when the triggering condition is monitored include: generating a new configuration index according to the triggering condition; selecting a corresponding new physical layer signal structure configuration from a preset pre-stored configuration set according to the new configuration index; generating a corresponding new OFDM physical layer signal structure at the starting time of the next OFDM symbol block according to the new physical layer signal structure configuration; sending information to the receiving end at the starting time of the next OFDM symbol block in the new OFDM physical layer signal structure; After the new configuration index is generated, the method further includes: sending the new configuration index to the receiving end before the starting time of the next OFDM symbol block.

[0013] Optionally, the preset pre-stored configuration set is a set of multiple physical layer signal structure configurations, each of the physical layer signal structure configurations in the preset pre-stored configuration set includes a pilot code pattern and a data mapping strategy, and each of the physical layer signal structure configurations corresponds to a unique configuration index. The type of physical layer signal structure configuration in the preset pre-stored configuration set is: The high reliability mode physical layer signal structure configuration has a pilot density of 1 / 4 and is a distributed pilot coding pattern. The high-efficiency mode physical layer signal structure configuration has a pilot density of 1 / 8 and is a centralized pilot coding pattern.

[0014] Optionally, after adaptively adjusting the physical layer signal structure and sending it to the receiving end, the method further includes: If a rollback condition is detected within the first preset time period, a rollback strategy is adopted according to the rollback condition. The rollback strategy includes: If the rollback condition is a single reconstruction invalid, then establish a link relationship between the trigger condition corresponding to the single reconstruction invalid and the new configuration index, and add the link relationship to the blacklist. The blacklist is used to prohibit the use of the new configuration index in the link relationship when the trigger condition in the link relationship is detected within a second preset time period. If the fallback condition is continuous reconstruction failure, then the channel currently used by the power communication is determined to be extremely poor, and the system automatically falls back to the high reliability mode physical layer signal structure configuration. If the fallback condition is that a link cannot be established, then the primary / backup switching of the power communication link is triggered.

[0015] Secondly, an OFDM-based terminal dual-mode communication adaptive modulation device is provided, the device being applied to the transmitting end of power communication, the device comprising: The sensing unit is used to obtain the interference sensing matrix based on the frequency domain interference component, the phase interference component, and the time domain interference component. The decision-making unit is used to allocate resource blocks to be scheduled based on the interference perception matrix, the priority queue of services to be scheduled, and the constraints. The management unit is used to adaptively remodulate and re-divide the physical layer signal and send it to the receiving end when a trigger condition is detected.

[0016] Thirdly, a computer device is provided, including a memory, a processor, and a terminal program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the method as described in any of the preceding claims.

[0017] Fourthly, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the method as described in any of the preceding claims.

[0018] This invention provides an adaptive modulation method, apparatus, computer device, and storage medium for dual-mode terminal communication based on OFDM. The method is applied to the transmitting end of power communication and includes: obtaining an interference sensing matrix based on frequency domain interference components, phase interference components, and time domain interference components; allocating resource blocks to be scheduled based on the interference sensing matrix, a priority queue of services to be scheduled, and constraints; and adaptively remodulating and frequency-dividing the physical layer signal and transmitting it to the receiving end when a trigger condition is detected. The method of this invention obtains the interference sensing matrix based on frequency domain interference components, phase interference components, and time domain interference components. Because it employs an interference sensing mechanism based on multi-dimensional feature extraction and establishes an interference sensing matrix integrating frequency, phase, and time domain dimensions, it can more comprehensively and accurately identify composite interference such as impulse noise, frequency-selective fading, and phase noise in power channels, and can locate interfered resource units earlier and more accurately, providing a reliable data foundation for subsequent proactive avoidance. Furthermore, this invention also allocates resource blocks to be scheduled based on the interference sensing matrix, the priority queue of services to be scheduled, and constraints. Upon detecting a trigger condition, the physical layer signal is adaptively remodulated and frequency-divided before being transmitted to the receiver. This invention can adaptively adjust the physical layer signal structure, enabling the method to rapidly switch transmission configurations at the OFDM symbol level to avoid interference. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0020] 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.

[0021] Figure 1 The diagram shows the application environment of the OFDM-based adaptive modulation method for terminal dual-mode communication according to an embodiment of the present invention. Figure 2 The diagram shown is a flowchart of the adaptive modulation method for terminal dual-mode communication based on OFDM according to an embodiment of the present invention. Figure 3 The diagram shown is a schematic diagram of obtaining the interference sensing matrix according to an embodiment of the present invention; Figure 4 The diagram shown is a structural block diagram of an OFDM-based terminal dual-mode communication adaptive modulation device according to an embodiment of the present invention. Figure 5The diagram shown is an internal structural diagram of a computer device in an embodiment of the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0023] Figure 1 This is an application environment diagram of an OFDM-based terminal dual-mode communication adaptive modulation method in one embodiment. (Refer to...) Figure 1 This OFDM-based adaptive modulation method for terminal dual-mode communication is applied to a power OFDM communication system. The method includes a transmitter 110 and a receiver 120. The transmitter 110 and receiver 120 are connected via power line carrier. The transmitter 110 can be a transmitter, desktop terminal, or mobile terminal with signal transmission capabilities, or a data acquisition terminal with a dual-mode module. The receiver 120 can be at least one of a receiver, mobile phone, tablet computer, or laptop computer with signal reception capabilities, or an energy meter with a dual-mode module.

[0024] In this embodiment of the invention, the sending end 110 may also have a receiving function, while the receiving end 120 may also have a sending function.

[0025] In this embodiment of the invention, the transmitting end 110 and the receiving end 120 can be implemented by a server or a server cluster composed of multiple servers, or specifically by networking the data acquisition terminal with multiple electricity meters.

[0026] Figure 2 The diagram shows a flowchart of an OFDM-based adaptive modulation method for dual-mode terminal communication according to an embodiment of the present invention. This method is applied to the transmitting end of power communication. Figure 2 As shown, the method includes: Step 210: Obtain the interference sensing matrix based on the frequency domain interference component, phase interference component, and time domain interference component; Step 220: Allocate resource blocks to be scheduled based on the interference perception matrix, the priority queue of services to be scheduled, and the constraints. Step 230: When the trigger condition is detected, the physical layer signal is adaptively remodulated and frequency divided and sent to the receiving end.

[0027] The method of this invention obtains an interference sensing matrix based on frequency-domain interference components, phase interference components, and time-domain interference components. By employing an interference sensing mechanism based on multi-dimensional feature extraction and establishing an interference sensing matrix that integrates frequency, phase, and time domain dimensions, it can more comprehensively and accurately identify composite interference such as impulse noise, frequency-selective fading, and phase noise in power channels. This allows for earlier and more accurate location of interfered resource units, providing a reliable data foundation for subsequent proactive avoidance. Furthermore, this invention allocates resource blocks to be scheduled based on the interference sensing matrix, the priority queue of services to be scheduled, and constraints. When a trigger condition is detected, the physical layer signal is adaptively re-modulated and re-frequency-divided before being transmitted to the receiver. This invention can adaptively adjust the physical layer signal structure, enabling the method to quickly switch transmission configurations at the OFDM symbol level to avoid interference.

[0028] In this embodiment of the invention, step 210, obtaining the interference sensing matrix based on the frequency domain interference component, phase interference component, and time domain interference component, includes: Obtain the deviation between the received power and the ideal power of each subcarrier within the current OFDM symbol block to obtain the frequency domain interference component, or Based on the variance of the received power of each subcarrier within the current OFDM symbol block across multiple consecutive symbols, narrowband interference subcarriers or deep fading subcarriers are obtained to acquire frequency domain interference components. The phase of the pilot symbol is extracted, and the error between the phase of the pilot symbol and the ideal phase is obtained as the first error. The variance of the first error within an OFDM symbol block is obtained as the phase interference component. The reported short-term bit error rate statistics or soft decision noise ratio are subjected to exponential weighted moving average filtering to smooth out instantaneous fluctuations and obtain an index that reflects the time-varying stability of the channel. This index is then used as the time-domain interference component. Confidence assessments based on instantaneous signal-to-noise ratio and historical statistics are performed on the frequency domain interference component, the phase interference component, and the time domain interference component. Based on the confidence assessment results, obtain the interference weight value of each interference component; An interference sensing matrix is ​​obtained based on the frequency domain interference component, the phase interference component, the time domain interference component, and the interference weight value of each interference component.

[0029] In this embodiment of the invention, after obtaining the interference weight value of each interference component based on the confidence assessment result and before obtaining the interference sensing matrix, the method further includes: If the instantaneous signal-to-noise ratio of any interference component at multiple consecutive sampling times is lower than a preset threshold, then the interference weight value of the interference component is reduced by a preset step size.

[0030] The method of this invention dynamically adjusts the interference weight value according to the interference, thereby adjusting the interference perception matrix. This enables earlier and more accurate location of the interfered resource units, providing a reliable data foundation for subsequent proactive avoidance.

[0031] The interference sensing matrix can be obtained as follows: in, For the interference sensing matrix, For frequency domain interference components, For time-domain interference components, For phase interference components, , and This is the interference weight value.

[0032] In this embodiment of the invention, the frequency domain interference component, phase interference component, and time domain interference component can be obtained in parallel without interference between them.

[0033] Figure 3 The diagram shown is a schematic diagram of obtaining the interference sensing matrix according to an embodiment of the present invention. The frequency domain interference component, phase interference component and time domain interference component are monitored in parallel in three ways. After the corresponding data are evaluated for effectiveness, a confidence assessment based on instantaneous signal-to-noise ratio and historical statistics is performed, and after weighted fusion, the interference sensing matrix is ​​obtained.

[0034] In this embodiment of the invention, allocating resource blocks to services based on the interference perception matrix, the priority queue of services to be scheduled, and constraints includes: The services to be scheduled are sorted from highest to lowest priority to obtain the priority queue of the services to be scheduled. Based on the interference perception matrix, signal-to-noise ratio cost factor, service priority cost factor, spectrum efficiency cost factor, and orthogonality protection cost factor, obtain the comprehensive cost matrix. Under constraints, based on the comprehensive cost matrix, the resource block with the lowest cost is obtained from the resource pool and allocated to the first scheduled service in the scheduled service priority queue; Remove the allocated resource blocks from the resource pool and remove the scheduled services with allocated resource blocks from the scheduled service priority queue; Allocate a resource block with the lowest cost to each service in the priority queue of scheduled services until there are no more services to be scheduled in the priority queue of scheduled services. The correspondence between the scheduled service and the resource block is used as a resource subcarrier mapping scheme.

[0035] In this embodiment of the invention, a comprehensive cost matrix is ​​obtained based on the interference sensing matrix, signal-to-noise ratio cost factor, service priority cost factor, spectral efficiency cost factor, and orthogonality protection cost factor, in the following manner: The comprehensive cost matrix, For the interference sensing matrix, As a business priority cost factor, The signal-to-noise ratio cost factor. This is the spectral efficiency cost factor. , , and The cost weight value.

[0036] Weights in , , and Yes, it can be adjusted dynamically based on the priority of power services. For example, when the system identifies a high-priority service, the cost weight value of the interference sensing matrix can be automatically increased. Cost weighting values ​​for business priorities The percentage.

[0037] In this embodiment of the invention, the above-mentioned allocation of resources to different services can be a cyclical process. After allocating resources to the first service to be scheduled in the current service priority queue, that is, the service with the highest priority, the service to be scheduled is removed. At this time, the next service to be scheduled becomes the first service to be scheduled in the service priority queue, and resources are continued to be allocated to this service to be scheduled.

[0038] In this embodiment of the invention, when allocating resources for different services, transmission reliability, service priority, and system spectral efficiency can be considered simultaneously. By solving the problem of minimizing the mapping cost function, high-priority services, such as power control signaling, can be dynamically scheduled to resource blocks with optimal channel conditions, thereby achieving deterministic assurance of the quality of service for critical services at the system level.

[0039] In this embodiment of the invention, the triggering conditions include: changes in interference or performance degradation. The step of adaptively adjusting the physical layer signal structure and sending it to the receiving end when a trigger condition is detected includes: A new configuration index is generated based on the triggering conditions; Based on the new configuration index, select the corresponding new physical layer signal structure configuration from the preset pre-stored configuration set; Based on the new physical layer signal structure configuration, at the start time of the next OFDM symbol block, a corresponding new OFDM physical layer signal structure is generated; Using the new OFDM physical layer signal structure, information is sent to the receiving end at the start of the next OFDM symbol block; After generating the new configuration index, the method further includes: The new configuration index is sent to the receiving end before the start time of the next OFDM symbol block.

[0040] In this embodiment of the invention, the preset pre-stored configuration set is a set of multiple physical layer signal structure configurations. Each physical layer signal structure configuration in the preset pre-stored configuration set includes a pilot coding pattern and a data mapping strategy. Each physical layer signal structure configuration corresponds to a unique configuration index. The type of physical layer signal structure configuration in the preset pre-stored configuration set is: The high reliability mode physical layer signal structure configuration has a pilot density of 1 / 4 and is a distributed pilot coding pattern. The high-efficiency mode physical layer signal structure configuration has a pilot density of 1 / 8 and is a centralized pilot coding pattern.

[0041] In this embodiment of the invention, the parameters shared by the high-reliability mode physical layer signal structure and the high-reliability mode physical layer signal structure include: a total number of subcarriers of 1024, a number of effective subcarriers of 600, and a basic OFDM symbol duration of [missing information]. The frame duration is fixed at 10ms.

[0042] In this embodiment of the invention, the purpose of configuring the high-reliability mode physical layer signal structure is to maximize robustness against impulse noise and deep fading. Its pilot coding pattern is a distributed pilot coding pattern, specifically a comb-type pattern, with a pilot density of 1 / 4. Its cyclic prefix is ​​a long CP, with a duration of... Total symbol duration In its physical layer signal structure, the synchronization and signaling domain consists of 2 symbols, the data domain consists of 10 symbols, the frame interval is 0.5ms, the total number of characters per frame is 12 symbols, and the total frame duration is [missing information]. The calculation method is as follows: Its super physical layer signal structure consists of 5 data frames contained in a 10ms superframe.

[0043] In this embodiment of the invention, the high reliability mode physical layer signal structure configuration uses QPSK (2 bits / symbol) and 1 / 2 coding rate for modulation and coding. The single symbol data payload (the available data subcarriers per symbol) is 450 subcarriers, the net payload bits per symbol are 450 bits, and the net payload bytes per symbol are approximately 56.25 bytes (actually 56 bytes, with the remaining bits padded). The single frame data payload is 560 bytes, and the total session capacity is 2800 bytes. A typical power distribution automation terminal status report (data size approximately 28 KB) requires the transmission of 10 superframes, i.e., 100 milliseconds.

[0044] In this embodiment of the invention, the purpose of configuring the high-efficiency mode physical layer signal structure is to maximize spectral efficiency when the channel is excellent. Its pilot coding pattern is a centralized pilot coding pattern, specifically a block-type pattern, with a time-domain density of 1 / 14. Its cyclic prefix is ​​a short CP with a duration of... Total symbol duration In its physical layer signal structure, the synchronization and signaling domain consists of 1 symbol, the data domain consists of 13 symbols, the frame interval is 0.25ms, the total number of characters per frame is 14 symbols, and the total frame duration is [missing information]. The calculation method is as follows: Its super physical layer signal structure consists of 5 data frames contained in a 10ms superframe.

[0045] In this embodiment of the invention, the triggering conditions include interference changes or performance degradation. For example, the triggering conditions could be SNR < 10dB for three consecutive subframes and a high-priority service block error rate (BLER) greater than 5%. After detecting the triggering conditions, it will assess whether the remaining resources support the minimum service requirements after adaptively adjusting the physical layer signal structure. If not, the adjustment will be abandoned and flow control will be triggered; if it supports, the adjustment will be performed.

[0046] In this embodiment of the invention, before the start time of the next OFDM symbol, the new configuration index is sent to the receiving end. The new configuration index is sent in the form of signaling, and the signaling structure of the new configuration index includes the configuration index (1 byte) and CRC checksum (2 bytes). Three levels of protection are implemented, namely: Encoding level: The above 3-byte signaling unit is encoded using RS(15, 3) to generate a 15-byte codeword, which has a strong ability to correct burst errors; Mapping level: The encoded signaling is fixedly mapped to 48 predefined subcarriers in the signaling domain, which are BPSK modulated and located at the center of the frequency domain; Time level: This signaling is transmitted completely repeatedly in two consecutive OFDM symbols.

[0047] In this embodiment of the invention, after the transmitting end sends the new configuration index to the receiving end, it completes the adjustment between the start time of the next OFDM symbol block and applies the new OFDM physical layer signal structure at the start time of the next OFDM symbol block.

[0048] In this embodiment of the invention, the synchronization preamble of the new OFDM symbol block must be regenerated according to the new configuration, for example, using the Zadoff-Chu sequence, to achieve reliable synchronization under low signal-to-noise ratio. The receiver employs a double-buffering mechanism to maintain the current physical layer signal structure parsing while decoding the signaling; after confirming the validity of the signaling, it switches to the new parsing buffer at the start of the next OFDM symbol block.

[0049] In this embodiment of the invention, after the new physical layer signal structure configuration is applied and the handover is successful, the current interference sensing matrix and resource subcarrier mapping scheme are forcibly cleared. All modules are reinitialized based on the new physical layer signal structure to prevent inconsistencies in state. One complete superframe (10ms) after the handover is set as the observation window to monitor whether the service layer indicators (such as the success rate of control command transmission) have improved, thereby achieving closed-loop self-healing and ultimate protection.

[0050] In this embodiment of the invention, after adaptively remodulating and frequency-dividing the physical layer signal and sending it to the receiving end when a trigger condition is detected, the method further includes: If a rollback condition is detected within the first preset time period, a rollback strategy is adopted according to the rollback condition. The rollback strategy includes: If the rollback condition is a single reconstruction invalid, then establish a link relationship between the trigger condition corresponding to the single reconstruction invalid and the new configuration index, and add the link relationship to the blacklist. The blacklist is used to prohibit the use of the new configuration index in the link relationship when the trigger condition in the link relationship is detected within a second preset time period. If the fallback condition is continuous reconstruction failure, then the channel currently used by the power communication is determined to be extremely poor, and the system automatically falls back to the high reliability mode physical layer signal structure configuration. If the fallback condition is that a link cannot be established, the primary / backup switch of the power communication link is triggered and reported to the network management system.

[0051] The method in this invention can achieve dynamic optimization of the physical layer signal structure without compromising protocol compatibility, maintaining full compatibility with existing communication standards and can be implemented through standard signaling (such as MAC CE). This invention employs a physical layer signal structure adaptive mechanism based on a preset pre-stored configuration set, enabling rapid switching of transmission configurations at the OFDM symbol block level before the next OFDM symbol block is transmitted to avoid interference. This fundamentally avoids the synchronization loss and huge signaling overhead problems caused by "symbol-level" dynamic reconstruction; it achieves rapid deployment in engineering, requiring only software upgrades rather than hardware modifications; and through the joint optimization of pilot coding patterns and data mapping, it essentially reconstructs the observation matrix of the channel frequency response, providing higher signal-to-noise ratio and better frequency division sampling points for subsequent channel estimation algorithms (such as LMMSE). This improves the system's ability to resist interference from the source of information acquisition, effectively reducing the impact of strong interference on system performance when facing rapidly changing composite interference in power communication.

[0052] In this embodiment of the invention, after receiving the preset pre-stored configuration set from the sender, the receiver stores it locally for later use.

[0053] Figure 4 The diagram shown is a structural schematic of an OFDM-based terminal dual-mode communication adaptive modulation device according to an embodiment of the present invention. Figure 4 As shown, the device is used at the transmitting end of power communication, and the device includes: The sensing unit 410 is used to obtain the interference sensing matrix based on the frequency domain interference component, the phase interference component and the time domain interference component; Decision unit 420 is used to allocate resource blocks to be scheduled based on the interference perception matrix, the priority queue of services to be scheduled, and the constraints. The management unit 430 is used to adaptively remodulate and re-divide the physical layer signal and send it to the receiving end when a trigger condition is detected.

[0054] In this embodiment of the invention, the sensing unit 410 is further configured to: Obtain the deviation between the received power and the ideal power of each subcarrier within the current OFDM symbol block to obtain the frequency domain interference component, or Based on the variance of the received power of each subcarrier within the current OFDM symbol block across multiple consecutive symbols, narrowband interference subcarriers or deep fading subcarriers are obtained to acquire frequency domain interference components. The phase of the pilot symbol is extracted, and the error between the phase of the pilot symbol and the ideal phase is obtained as the first error. The variance of the first error within an OFDM symbol block is obtained as the phase interference component. The reported short-term bit error rate statistics or soft decision noise ratio are subjected to exponential weighted moving average filtering to smooth out instantaneous fluctuations and obtain an index that reflects the time-varying stability of the channel. This index is then used as the time-domain interference component. Confidence assessments based on instantaneous signal-to-noise ratio and historical statistics are performed on the frequency domain interference component, the phase interference component, and the time domain interference component. Based on the confidence assessment results, obtain the interference weight value of each interference component; An interference sensing matrix is ​​obtained based on the frequency domain interference component, the phase interference component, the time domain interference component, and the interference weight value of each interference component.

[0055] In this embodiment of the invention, the sensing unit 410 is further configured to: If the instantaneous signal-to-noise ratio of any interference component at multiple consecutive sampling times is lower than a preset threshold, then the interference weight value of the interference component is reduced by a preset step size.

[0056] Decision unit 420 is also used for: The services to be scheduled are sorted from highest to lowest priority to obtain the priority queue of the services to be scheduled. Based on the interference perception matrix, signal-to-noise ratio cost factor, service priority cost factor, spectrum efficiency cost factor, and orthogonality protection cost factor, obtain the comprehensive cost matrix. Under constraints, based on the comprehensive cost matrix, the resource block with the lowest cost is obtained from the resource pool and allocated to the first scheduled service in the scheduled service priority queue; Remove the allocated resource blocks from the resource pool and remove the scheduled services with allocated resource blocks from the scheduled service priority queue; Allocate a resource block with the lowest cost to each service in the priority queue of scheduled services until there are no more services to be scheduled in the priority queue of scheduled services. The correspondence between the scheduled service and the resource block is used as a resource subcarrier mapping scheme.

[0057] In this embodiment of the invention, the decision unit 420 is further configured to obtain a comprehensive cost matrix based on the interference sensing matrix, signal-to-noise ratio cost factor, service priority cost factor, spectrum efficiency cost factor, and orthogonality protection cost factor in the following manner: The comprehensive cost matrix, For the interference sensing matrix, As a business priority cost factor, The signal-to-noise ratio cost factor. This is the spectral efficiency cost factor. , , and The cost weight value.

[0058] In this embodiment of the invention, the triggering conditions include: changes in interference or performance degradation. The management unit 430 is also used for: A new configuration index is generated based on the triggering conditions; Based on the new configuration index, select the corresponding new physical layer signal structure configuration from the preset pre-stored configuration set; Based on the new physical layer signal structure configuration, at the start time of the next OFDM symbol block, a corresponding new OFDM physical layer signal structure is generated; Using the new OFDM physical layer signal structure, information is sent to the receiving end at the start of the next OFDM symbol block; The management unit 430 is further configured to: after generating the new configuration index, send the new configuration index to the receiving end before the start time of the next OFDM symbol block.

[0059] The preset pre-stored configuration set is a set of multiple physical layer signal structure configurations. Each physical layer signal structure configuration in the preset pre-stored configuration set includes a pilot coding pattern and a data mapping strategy. Each physical layer signal structure configuration corresponds to a unique configuration index. The type of physical layer signal structure configuration in the preset pre-stored configuration set is: The high reliability mode physical layer signal structure configuration has a pilot density of 1 / 4 and is a distributed pilot coding pattern. The high-efficiency mode physical layer signal structure configuration has a pilot density of 1 / 8 and is a centralized pilot coding pattern.

[0060] In this embodiment of the invention, the device further includes a back-off unit, used after the adaptive adjustment of the physical layer signal structure and transmission to the receiving end: If a rollback condition is detected within the first preset time period, a rollback strategy is adopted according to the rollback condition. The rollback strategy includes: If the rollback condition is a single reconstruction invalid, then establish a link relationship between the trigger condition corresponding to the single reconstruction invalid and the new configuration index, and add the link relationship to the blacklist. The blacklist is used to prohibit the use of the new configuration index in the link relationship when the trigger condition in the link relationship is detected within a second preset time period. If the fallback condition is continuous reconstruction failure, then the channel currently used by the power communication is determined to be extremely poor, and the system automatically falls back to the high reliability mode physical layer signal structure configuration. If the fallback condition is that a link cannot be established, then the primary / backup switching of the power communication link is triggered.

[0061] This invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the terminal program, it implements the following method: The method includes: obtaining an interference sensing matrix based on frequency domain interference components, phase interference components, and time domain interference components; allocating resource blocks to be scheduled based on the interference sensing matrix, a priority queue of services to be scheduled, and constraints; and adaptively remodulating and re-dividing the physical layer signal and sending it to the receiving end when a trigger condition is detected.

[0062] This invention also provides a computer-readable storage medium storing a computer program thereon. When the computer program is executed by a processor, it implements the following method: the method includes: obtaining an interference sensing matrix based on frequency domain interference components, phase interference components, and time domain interference components; allocating resource blocks to be scheduled based on the interference sensing matrix, a priority queue of services to be scheduled, and constraints; and adaptively remodulating and re-dividing the physical layer signal and sending it to the receiving end when a triggering condition is detected.

[0063] The aforementioned power OFDM communication method achieves the beneficial effect of solving the technical problems mentioned in the background art.

[0064] Figure 2 This is a flowchart illustrating an OFDM-based adaptive modulation method for dual-mode terminal communication in one embodiment. It should be understood that, although... Figure 2 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order in which these steps are executed, and they can be performed in other orders. Figure 2 At least some of the steps in the process may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.

[0065] Figure 5 An internal structural diagram of a computer device in one embodiment is shown. Specifically, this computer device may be... Figure 1The transmitter 110 and receiver 120 are shown in the diagram. Figure 5 As shown, the computer device includes a processor, memory, network interface, input device, and display screen connected via a system bus. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores an operating system and may also store a computer program. When executed by the processor, this computer program enables the processor to implement an OFDM (Optical Frequency Directional Communication) method. The internal memory may also store a computer program. When executed by the processor, this computer program enables the processor to implement an OFDM-based terminal dual-mode communication adaptive modulation method. The display screen can be a liquid crystal display (LCD) or an e-ink display. The input device can be a touch layer covering the display screen, buttons, a trackball, or a touchpad mounted on the computer device's casing, or an external keyboard, touchpad, or mouse.

[0066] Those skilled in the art will understand that Figure 5 The structure shown is merely a block diagram of a portion of the structure related to the present invention and does not constitute a limitation on the computer device to which the present invention is applied. A specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0067] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided by this invention can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0068] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0069] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An adaptive modulation method for dual-mode terminal communication based on OFDM, characterized in that, The method is applied to the transmitting end of power communication, and the method includes: The interference sensing matrix is ​​obtained based on the frequency domain interference component, phase interference component, and time domain interference component. Based on the interference perception matrix, the priority queue of services to be scheduled, and the constraints, resource blocks are allocated to the services to be scheduled. When a trigger condition is detected, the physical layer signal is adaptively remodulated and frequency-divided before being sent to the receiver.

2. The method according to claim 1, characterized in that, The process of obtaining the interference sensing matrix based on the frequency domain interference component, phase interference component, and time domain interference component includes: Obtain the deviation between the received power and the ideal power of each subcarrier within the current OFDM symbol block to obtain the frequency domain interference component, or Based on the variance of the received power of each subcarrier within the current OFDM symbol block across multiple consecutive symbols, narrowband interference subcarriers or deep fading subcarriers are obtained to acquire frequency domain interference components. The phase of the pilot symbol is extracted, and the error between the phase of the pilot symbol and the ideal phase is obtained as the first error. The variance of the first error within a symbol block is obtained as the phase interference component. The reported short-term bit error rate statistics or soft decision noise ratio are subjected to exponential weighted moving average filtering to smooth out instantaneous fluctuations and obtain an index that reflects the time-varying stability of the channel. This index is then used as the time-domain interference component. Confidence assessments based on instantaneous signal-to-noise ratio and historical statistics are performed on the frequency domain interference component, the phase interference component, and the time domain interference component. Based on the confidence assessment results, obtain the interference weight value of each interference component; An interference sensing matrix is ​​obtained based on the frequency domain interference component, the phase interference component, the time domain interference component, and the interference weight value of each interference component.

3. The method according to claim 2, characterized in that, After obtaining the interference weight values ​​of each interference component based on the confidence assessment results and before obtaining the interference sensing matrix, the method further includes: If the instantaneous signal-to-noise ratio of any interference component at multiple consecutive sampling times is lower than a preset threshold, then the interference weight value of the interference component is reduced by a preset step size.

4. The method according to claim 1, characterized in that, The step of allocating resource blocks to services based on the interference perception matrix, the priority queue of services to be scheduled, and constraints includes: The services to be scheduled are sorted from highest to lowest priority to obtain the priority queue of the services to be scheduled. Based on the interference perception matrix, signal-to-noise ratio cost factor, service priority cost factor, spectrum efficiency cost factor, and orthogonality protection cost factor, obtain the comprehensive cost matrix. Under constraints, based on the comprehensive cost matrix, the resource block with the lowest cost is obtained from the resource pool and allocated to the first scheduled service in the scheduled service priority queue; Remove the allocated resource blocks from the resource pool and remove the scheduled services with allocated resource blocks from the scheduled service priority queue; Allocate a resource block with the lowest cost to each service in the priority queue of scheduled services until there are no more services to be scheduled in the priority queue of scheduled services. The correspondence between the scheduled service and the resource block is used as a resource subcarrier mapping scheme; Specifically, the comprehensive cost matrix is ​​obtained based on the interference sensing matrix, signal-to-noise ratio cost factor, service priority cost factor, spectrum efficiency cost factor, and orthogonality protection cost factor, in the following manner: The comprehensive cost matrix, For the interference sensing matrix, As a business priority cost factor, The signal-to-noise ratio cost factor. This is the spectral efficiency cost factor. , , and The cost weight value.

5. The method according to claim 1, characterized in that, The triggering conditions include: changes in interference or performance degradation. The step of adaptively adjusting the physical layer signal structure and sending it to the receiving end when a trigger condition is detected includes: A new configuration index is generated based on the triggering conditions; Based on the new configuration index, select the corresponding new physical layer signal structure configuration from the preset pre-stored configuration set; Based on the new physical layer signal structure configuration, at the start time of the next OFDM symbol block, a corresponding new OFDM physical layer signal structure is generated; Using the new OFDM physical layer signal structure, information is sent to the receiving end at the start of the next OFDM symbol block; After generating the new configuration index, the method further includes: The new configuration index is sent to the receiving end before the start time of the next OFDM symbol block.

6. The method according to claim 5, characterized in that, The preset pre-stored configuration set is a set of multiple physical layer signal structure configurations. Each physical layer signal structure configuration in the preset pre-stored configuration set includes a pilot coding pattern and a data mapping strategy. Each physical layer signal structure configuration corresponds to a unique configuration index. The type of physical layer signal structure configuration in the preset pre-stored configuration set is: The high reliability mode physical layer signal structure configuration has a pilot density of 1 / 4 and is a distributed pilot coding pattern. The high-efficiency mode physical layer signal structure configuration has a pilot density of 1 / 8 and is a centralized pilot coding pattern.

7. The method according to claim 6, characterized in that, The method further includes: adaptively remodulating and frequency-dividing the physical layer signal and transmitting it to the receiving end; If a rollback condition is detected within the first preset time period, a rollback strategy is adopted according to the rollback condition. The rollback strategy includes: If the rollback condition is a single reconstruction invalid, then establish a link relationship between the trigger condition corresponding to the single reconstruction invalid and the new configuration index, and add the link relationship to the blacklist. The blacklist is used to prohibit the use of the new configuration index in the link relationship when the trigger condition in the link relationship is detected within a second preset time period. If the fallback condition is continuous reconstruction failure, then the channel currently used by the power communication is determined to be extremely poor, and the system automatically falls back to the high reliability mode physical layer signal structure configuration. If the fallback condition is that a link cannot be established, then the primary / backup switching of the power communication link is triggered.

8. An OFDM-based terminal dual-mode communication adaptive modulation device, characterized in that, The device is used at the transmitting end of power communication, and the device includes: The sensing unit is used to obtain the interference sensing matrix based on the frequency domain interference component, the phase interference component, and the time domain interference component. The decision-making unit is used to allocate resource blocks to be scheduled based on the interference perception matrix, the priority queue of services to be scheduled, and the constraints. The management unit is used to adaptively remodulate and re-divide the physical layer signal and send it to the receiving end when a trigger condition is detected.

9. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method of any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method of any one of claims 1 to 7.

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