Communication system based on orthogonal frequency division multiplexing

Abstract

The invention discloses a communication system based on orthogonal frequency division multiplexing, and relates to the technical field of communication. The system comprises a service module, and a request module, an acquisition module, a division module, a distribution module and a judgment module which are respectively in communication connection with the service module, the service module is used for performing unified scheduling management on communication data of each module and serving an information transmission process of the communication terminal; the division module is used for dividing the bandwidth of the network service node providing the network data service into a plurality of sub-bandwidths according to the basic bandwidth of the communication terminal, and the size of each sub-bandwidth is smaller than that of the basic bandwidth; the basic bandwidth is the minimum bandwidth of a communication terminal accessing the communication system. The legal communication data and the illegal communication data are distinguished through the judgment module, the illegal data can be accurately intercepted through the method, meanwhile, transmission of other legal data is not affected, and the flexibility and safety of the communication system are greatly improved.

Description

Technical Field

[0001] The present invention belongs to the field of communication technology, and in particular relates to a communication system based on orthogonal frequency division multiplexing. Background Art

[0002] The transmission quality of power line networks can be improved by using orthogonal frequency division multiplexing, a multi-carrier modulation technology. The unstable transmission quality means that power line networks cannot guarantee the transmission quality of real-time applications such as voice and video streaming. However, it is an ideal network for transmitting bursty Internet data streams. Even when the distribution network is severely disturbed, OFDM can provide high bandwidth and guarantee bandwidth transmission efficiency, and appropriate error correction technology can ensure reliable data transmission.

[0003] At present, the use of wireless data is mainly reflected in the playback of various media data. For the same communication device, there may be multiple communication data transmission applications, and multiple applications are transmitting data at the same time. Due to the variability and randomness of the data transmission volume, the number of wireless data transmissions and the amount of data expected by the communication device in the future time partition cannot be reliably predicted, which in turn leads to the inability of network nodes to allocate bandwidth. At the same time, some communication control areas use the communication system to achieve full-standard shielding of terminals covered in the target area, which results in all communication users in the target area being unable to communicate normally. While shielding illegal communication applications, normal and legal communication applications cannot access the public network, making the bandwidth allocated to each wireless communication device unreasonable and the utilization rate low.

[0004] The existing wireless communication system cannot quickly distinguish between illegal communication applications and legal communication applications, which leads to unreasonable bandwidth allocation of network nodes. For this reason, we propose a communication system based on orthogonal frequency division multiplexing. Summary of the invention

[0005] The purpose of the present invention is to provide a communication system based on orthogonal frequency division multiplexing to solve the problem that the existing wireless communication system cannot quickly distinguish between illegal communication applications and legal communication applications, thus causing unreasonable bandwidth allocation of network nodes.

[0006] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] The present invention is a communication system based on orthogonal frequency division multiplexing, comprising a service module, and a request module, a collection module, a division module, an allocation module and a judgment module which respectively establish communication connections with the service module;

[0008] Service module: used for unified scheduling and management of communication data of each module, and serving the information transmission process of communication terminals;

[0009] A division module: used to divide the bandwidth of a network service node providing network data services into a plurality of sub-bandwidths according to the basic bandwidth of the communication terminal, each sub-bandwidth being smaller than the basic bandwidth; the basic bandwidth being the minimum bandwidth of the communication terminal accessing the communication system;

[0010] Collection module: used to collect the amount of uplink communication data in each unit time interval from the start of sending uplink communication data by the communication terminal;

[0011] Allocation module: used for allocating at least two adjacent sub-bandwidths as interaction channels for the communication terminal according to the amount of each uplink communication data;

[0012] Request module: used to request the uplink communication data transmission bandwidth of the communication terminal in the next unit time interval from the network service node providing network data service according to the estimated uplink communication data volume of the communication terminal in the next unit time interval;

[0013] Judgment module: used to compare the uplink communication data label in each unit time interval with the whitelist label set to determine whether the uplink communication data label exists in the whitelist label set. If it exists in the whitelist label set, bandwidth is allocated to the communication terminal according to the uplink communication data transmission bandwidth requested by the request module. If the uplink communication data label does not exist in the whitelist label set, bandwidth allocation is stopped from being requested from the allocation module.

[0014] Preferably, the service module is further used to receive uplink communication data sent by the communication terminal, and to receive downlink communication data sent by the public network center, and after the uplink communication data or the downlink communication data is processed and analyzed by the communication system, the uplink communication data label or the downlink communication data label that meets the communication system interaction condition is recorded in the storage module, and the communication data transmission is allowed;

[0015] The uplink communication data tag and the downlink communication data tag include the data source application, data volume, data type and data transmission time.

[0016] Preferably, the storage module is used to store the communication data tags of the communication data processed and analyzed by the communication system, and the storage rules are classified and stored in sequence according to the data source application, data type, data transmission time and data volume, for subsequent communication system administrators to review according to the classification.

[0017] Preferably, the minimum bandwidth of the communication terminal in the division module is the minimum amount of communication data sent by the communication terminal in each unit time interval, that is, one sub-bandwidth cannot be used as an interactive channel for communication data in a unit time interval, and at least two adjacent sub-bandwidths are used as interactive channels for communication data in a unit time interval.

[0018] Preferably, the acquisition module classifies each uplink communication data according to the data source application in the communication data tag of all the uplink communication data within the first unit time interval from the start of the communication terminal sending the uplink communication data, and establishes multiple data source unit time interval sets within different unit time intervals of the communication terminal according to different data source applications, each data source unit time interval set includes the uplink communication data of the same data source application within each unit time interval from the start to the end of the communication terminal sending the uplink communication data.

[0019] Preferably, the estimated uplink communication data volume in the next unit time interval in the request module includes the following specific contents: according to the actual uplink communication data volume in the unit time interval that has been collected, a function curve is established with time as the X-axis and the communication data volume as the Y-axis, and the estimated uplink communication data volume in the next unit time interval is roughly predicted according to the function curve, and the bandwidth occupied by the estimated uplink communication data volume does not exceed 120% of the bandwidth actually occupied by the uplink communication data volume in the previous unit time interval;

[0020] The uplink data transmission bandwidth includes at least two adjacent sub-bandwidths.

[0021] Preferably, the amount of uplink communication data transmitted in each unit time interval is determined by establishing a load model to determine whether the amount of uplink communication data in the unit time interval exceeds the bandwidth of the network service node providing network data services, and if so, it is determined to be a load; and subsequent bandwidth allocation is determined according to the load situation;

[0022] The communication system collects user traffic in the communication system area through the service module as analysis data, and uses the wavelet threshold method to remove noise in the traffic data. The adaptively selected threshold is shown in formula (1):

[0023]

[0024] Among them, γ represents the selected threshold; R represents the number of wavelet coefficients; N represents the number of decomposition levels; J represents the standard deviation of flow data;

[0025] Thus, a threshold function is constructed to remove noise from traffic data, as shown in formula (2):

[0026]

[0027] Where ω represents the wavelet transform coefficient; represents the result of wavelet threshold processing; reconstruct the decomposed data to obtain the complete traffic data after removing the noise; extract the information entropy characteristics of the traffic data, and construct the feature vector. The information entropy reflects the amount of information contained in the data. The larger the information entropy, the greater the load of the communication system. The information entropy calculation formula is shown in (3):

[0028]

[0029] Where F(X) represents information entropy, X represents the set of traffic data attributes; m i represents the number of times the i-th attribute occurs; M represents the total number of times the i-th attribute occurs; n represents the number of attributes. The threshold T is set to 1, and the communication system load model is constructed as shown in formula (4):

[0030]

[0031] Preferably, the data source application classification of the uplink communication data adopts Fourier transform.

[0032] The present invention has the following beneficial effects:

[0033] 1. The present invention divides the bandwidth of the network service node providing network data services into a plurality of sub-bandwidths according to the basic bandwidth of the communication terminal by setting a division module. What is important is that the size of the sub-bandwidth is smaller than the size of the basic bandwidth, and each sub-bandwidth cannot be used as an interactive channel for communication data within a unit time interval. This means that when illegal communication data transmission occurs, it is only necessary to reduce the bandwidth of the illegal information to one or not allocate bandwidth to prevent the transmission of illegal communication data, thereby achieving control over the security of communication data and shielding illegal communication data. At the same time, the traditional shielding device is eliminated, and the communication system can be used to prevent the transmission of illegal communication information, thereby reducing the cost of communication data shielding.

[0034] 2. The present invention collects communication data information within the area of ​​the communication system by setting up a collection module. The collection module classifies each uplink communication data according to the data source application in the communication data tag of all uplink communication data within the first unit time interval since the communication terminal started sending the uplink communication data, so that the uplink communication data sent by the communication terminal is divided into multiple categories, and each category of communication data is communicated and transmitted separately. This approach reduces the transmission amount of communication data within a unit time interval, classifies the communication data within a unit time interval, and greatly reduces the transmission load. At the same time, the data source application of the communication data is supervised to ensure the security of the data and avoid illegal data transmission.

[0035] 3. The present invention estimates the amount of uplink communication data in the next unit time interval by setting a request module, which can greatly reduce the calculation amount of the communication system. After completing the single allocation of uplink data in the previous unit time interval, the bandwidth of the uplink communication data in the next unit time interval can be quickly allocated, thereby improving the efficiency of the communication system.

[0036] 4. The present invention performs bidirectional supervision on the communication data within the communication system area by setting up a judgment module. When the communication terminal in the area sends uplink communication data to the outside, the communication data label of the communication data is compared with the white list label set. If the communication data exists in the white list label set, it means that the communication data is legal data. If the communication data does not exist in the white list label set, it means that the communication data is illegal data, and it is prohibited to allocate bandwidth to the communication data, that is, the communication data transmission is stopped.

[0037] 5. The present invention distinguishes between legal communication data and illegal communication data through a judgment module. This approach can accurately intercept illegal data without affecting the transmission of other legal data, thereby greatly improving the flexibility and security of the communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0039] Figure 1 A system block diagram of an orthogonal frequency division multiplexing-based communication system provided by the present invention. DETAILED DESCRIPTION

[0040] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0041] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] See also Figure 1 , the present invention is a communication system based on orthogonal frequency division multiplexing, including a service module, and a request module, a collection module, a division module, an allocation module and a judgment module that respectively establish communication connections with the service module;

[0044] Service module: used for unified scheduling and management of communication data of each module, and serving the information transmission process of communication terminals;

[0045] A division module: used to divide the bandwidth of a network service node providing network data services into a plurality of sub-bandwidths according to the basic bandwidth of the communication terminal, each sub-bandwidth being smaller than the basic bandwidth; the basic bandwidth being the minimum bandwidth of the communication terminal accessing the communication system;

[0046] Collection module: used to collect the amount of uplink communication data in each unit time interval from the start of sending uplink communication data by the communication terminal;

[0047] Allocation module: used for allocating at least two adjacent sub-bandwidths as interaction channels for the communication terminal according to the amount of each uplink communication data;

[0048] Request module: used to request the uplink communication data transmission bandwidth of the communication terminal in the next unit time interval from the network service node providing network data service according to the estimated uplink communication data volume of the communication terminal in the next unit time interval;

[0049] Judgment module: used to compare the uplink communication data label in each unit time interval with the whitelist label set to determine whether the uplink communication data label exists in the whitelist label set. If it exists in the whitelist label set, bandwidth is allocated to the communication terminal according to the uplink communication data transmission bandwidth requested by the request module. If the uplink communication data label does not exist in the whitelist label set, bandwidth allocation is stopped from being requested from the allocation module.

[0050] Preferably, the service module is further used to receive uplink communication data sent by the communication terminal, and to receive downlink communication data sent by the public network center, and after the uplink communication data or the downlink communication data is processed and analyzed by the communication system, the uplink communication data label or the downlink communication data label that meets the communication system interaction condition is recorded in the storage module, and the communication data transmission is allowed;

[0051] The uplink communication data tag and the downlink communication data tag include the data source application, data volume, data type and data transmission time.

[0052] Preferably, the storage module is used to store the communication data tags of the communication data processed and analyzed by the communication system, and the storage rules are classified and stored in sequence according to the data source application, data type, data transmission time and data volume, for subsequent communication system administrators to review according to the classification.

[0053] Preferably, the minimum bandwidth of the communication terminal in the division module is the minimum amount of communication data sent by the communication terminal in each unit time interval, that is, one sub-bandwidth cannot be used as an interactive channel for communication data in a unit time interval, and at least two adjacent sub-bandwidths are used as interactive channels for communication data in a unit time interval.

[0054] Preferably, the acquisition module classifies each uplink communication data according to the data source application in the communication data tag of all the uplink communication data within the first unit time interval from the start of the communication terminal sending the uplink communication data, and establishes multiple data source unit time interval sets within different unit time intervals of the communication terminal according to different data source applications, each data source unit time interval set includes the uplink communication data of the same data source application within each unit time interval from the start to the end of the communication terminal sending the uplink communication data.

[0055] Preferably, the estimated uplink communication data volume in the next unit time interval in the request module includes the following specific contents: according to the actual uplink communication data volume in the unit time interval that has been collected, a function curve is established with time as the X-axis and the communication data volume as the Y-axis, and the estimated uplink communication data volume in the next unit time interval is roughly predicted according to the function curve, and the bandwidth occupied by the estimated uplink communication data volume does not exceed 120% of the bandwidth actually occupied by the uplink communication data volume in the previous unit time interval;

[0056] The uplink data transmission bandwidth includes at least two adjacent sub-bandwidths.

[0057] Preferably, the amount of uplink communication data transmitted in each unit time interval is determined by establishing a load model to determine whether the amount of uplink communication data in the unit time interval exceeds the bandwidth of the network service node providing network data services, and if so, it is determined to be a load; and subsequent bandwidth allocation is determined according to the load situation;

[0058] The communication system collects user traffic in the communication system area through the service module as analysis data, and uses the wavelet threshold method to remove noise in the traffic data. The adaptively selected threshold is shown in formula (1):

[0059]

[0060] Among them, γ represents the selected threshold; R represents the number of wavelet coefficients; N represents the number of decomposition levels; J represents the standard deviation of flow data;

[0061] Thus, a threshold function is constructed to remove noise from traffic data, as shown in formula (2):

[0062]

[0063] Where ω represents the wavelet transform coefficient; represents the result of wavelet threshold processing; reconstruct the decomposed data to obtain the complete traffic data after removing the noise; extract the information entropy characteristics of the traffic data, and construct the feature vector. The information entropy reflects the amount of information contained in the data. The larger the information entropy, the greater the load of the communication system. The information entropy calculation formula is shown in (3):

[0064]

[0065] Where F(X) represents information entropy, X represents the set of traffic data attributes; m i represents the number of times the i-th attribute occurs; M represents the total number of times the i-th attribute occurs; n represents the number of attributes. The threshold T is set to 1, and the communication system load model is constructed as shown in formula (4):

[0066]

[0067] Preferably, the data source application classification of the uplink communication data adopts Fourier transform.

[0068] Among them, digital signal processing mainly studies the use of digital or symbol sequences to represent signals and complete processing of sequences. Discrete signals are signals that have numerical values ​​at specific discrete times, sampled signals are discrete signals with continuous amplitudes, and digital signals are sampled signals with quantized amplitudes. Therefore, digital signals are discrete in time and value. Computer technology can be used directly to complete signal analysis, signal transformation, and other processing. For example, for digital or symbolic function sequences, numerical calculation methods can be used to achieve signal detection, filtering, and parameter estimation, extract or enhance useful components of digital signals, and reduce noise components.

[0069] In signal processing, signal is the carrier of information, usually a function of time or frequency. Signal processing mainly realizes signal filtering and detection, parameter estimation and extraction, spectrum analysis and other tasks. Signal processing problems are involved in the engineering field, and the signal manifestations are also complex, including sound, light, heat, electricity, magnetism, etc. The original signal usually obtained by the system is an analog signal, which is continuous in amplitude and time. The digital signal processing system is mainly composed of the following parts: front-end analog signal receiving device, anti-aliasing filtering, A / D conversion, digital signal processing, D / A conversion, smoothing filtering, etc.

[0070] Fourier transform is an important tool for signal analysis and processing. It mainly analyzes the following relationship: the spectrum function with frequency as the independent variable and the signal function with time as the independent variable. By matching the function form of the signal in the time domain with the function form in the frequency domain, we get the Fourier transform of the signal.

[0071] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A communication system based on orthogonal frequency division multiplexing, characterized in that: It includes a service module, and a request module, a collection module, a division module, an allocation module and a judgment module which respectively establish communication connections with the service module; Service module: used for unified scheduling and management of communication data of each module, and serving the information transmission process of communication terminals; A division module: used to divide the bandwidth of a network service node providing network data services into a plurality of sub-bandwidths according to the basic bandwidth of the communication terminal, each sub-bandwidth being smaller than the basic bandwidth; the basic bandwidth being the minimum bandwidth of the communication terminal accessing the communication system; Collection module: used to collect the amount of uplink communication data in each unit time interval from the start of sending uplink communication data by the communication terminal; Allocation module: used for allocating at least two adjacent sub-bandwidths as interaction channels for the communication terminal according to the amount of each uplink communication data; Request module: used to request the uplink communication data transmission bandwidth of the communication terminal in the next unit time interval from the network service node providing network data service according to the estimated uplink communication data volume of the communication terminal in the next unit time interval; Judgment module: used to compare the uplink communication data label in each unit time interval with the whitelist label set to determine whether the uplink communication data label exists in the whitelist label set. If it exists in the whitelist label set, bandwidth is allocated to the communication terminal according to the uplink communication data transmission bandwidth requested by the request module. If the uplink communication data label does not exist in the whitelist label set, bandwidth allocation is stopped from being requested from the allocation module.

2. The communication system based on orthogonal frequency division multiplexing according to claim 1, characterized in that: The service module is also used to receive uplink communication data sent by the communication terminal, and to receive downlink communication data sent by the public network center. After the uplink communication data or the downlink communication data is processed and analyzed by the communication system, the uplink communication data label or the downlink communication data label that meets the communication system interaction condition is recorded in the storage module, and the communication data transmission is allowed; The uplink communication data tag and the downlink communication data tag include the data source application, data volume, data type and data transmission time.

3. The communication system based on orthogonal frequency division multiplexing according to claim 2, characterized in that: The storage module is used to store the communication data tags of the communication data processed and analyzed by the communication system. The storage rules are classified and stored in sequence according to the data source application, data type, data transmission time and data volume, so that the subsequent communication system administrator can review them according to the classification.

4. The communication system based on orthogonal frequency division multiplexing according to claim 3, characterized in that: The minimum bandwidth of the communication terminal in the division module is the minimum amount of communication data sent by the communication terminal in each unit time interval, that is, one sub-bandwidth cannot be used as an interactive channel for communication data in a unit time interval, and at least two adjacent sub-bandwidths are used as interactive channels for communication data in a unit time interval.

5. The communication system based on orthogonal frequency division multiplexing according to claim 4, characterized in that: The acquisition module classifies each uplink communication data according to the data source application in the communication data tag of all the uplink communication data within the first unit time interval when the communication terminal starts sending the uplink communication data, and establishes multiple data source unit time interval sets within different unit time intervals of the communication terminal according to different data source applications, each data source unit time interval set includes the uplink communication data of the same data source application in each unit time interval from the start to the end of the communication terminal sending the uplink communication data.

6. The communication system based on orthogonal frequency division multiplexing according to claim 5, characterized in that: The estimated uplink communication data volume in the next unit time interval in the request module includes the following specific contents: according to the actual uplink communication data volume in the unit time interval that has been collected, a function curve is established with time as the X-axis and the communication data volume as the Y-axis, and the estimated uplink communication data volume in the next unit time interval is roughly predicted according to the function curve, and the bandwidth occupied by the estimated uplink communication data volume does not exceed 120% of the bandwidth actually occupied by the uplink communication data volume in the previous unit time interval; The uplink data transmission bandwidth includes at least two adjacent sub-bandwidths.

7. The communication system based on orthogonal frequency division multiplexing according to claim 6, characterized in that: The amount of uplink communication data transmitted in each unit time interval is determined by establishing a load model to determine whether the amount of uplink communication data in the unit time interval exceeds the bandwidth of the network service node providing network data services, and if so, it is determined to be a load; and subsequent bandwidth allocation is determined according to the load situation; The communication system collects user traffic in the communication system area through the service module as analysis data, and uses the wavelet threshold method to remove noise in the traffic data. The adaptively selected threshold is shown in formula (1): Among them, γ represents the selected threshold; R represents the number of wavelet coefficients; N represents the number of decomposition levels; J represents the standard deviation of flow data; Thus, a threshold function is constructed to remove noise from traffic data, as shown in formula (2): Where ω represents the wavelet transform coefficient; represents the result of wavelet threshold processing; reconstruct the decomposed data to obtain the complete traffic data after removing the noise; extract the information entropy characteristics of the traffic data, and construct the feature vector. The information entropy reflects the amount of information contained in the data. The larger the information entropy, the greater the load of the communication system. The information entropy calculation formula is shown in (3): Where F(X) represents information entropy, X represents the set of traffic data attributes; m i represents the number of times the i-th attribute occurs; M represents the total number of times the i-th attribute occurs; n represents the number of attributes. The threshold T is set to 1, and the communication system load model is constructed as shown in formula (4):

8. The communication system based on OFDM according to claim 7, characterized in that: The data source application classification of the uplink communication data adopts Fourier transform.

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