CN119135323B - Multiplexing method of broadcast signals - Google Patents
Multiplexing method of broadcast signals Download PDFInfo
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- CN119135323B CN119135323B CN202411607711.5A CN202411607711A CN119135323B CN 119135323 B CN119135323 B CN 119135323B CN 202411607711 A CN202411607711 A CN 202411607711A CN 119135323 B CN119135323 B CN 119135323B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0473—Wireless resource allocation based on the type of the allocated resource the resource being transmission power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/30—Resource management for broadcast services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
- H04W72/563—Allocation or scheduling criteria for wireless resources based on priority criteria of the wireless resources
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Abstract
The invention relates to the technical field of multiplexing processing of broadcast signals, and particularly discloses a multiplexing method of broadcast signals, which comprises the specific steps that a broadcast signal processing device is used for receiving multipath broadcast signals from a broadcast tower, and the required bandwidth and priority of each path of broadcast signals are determined according to a pre-analysis module embedded in the broadcast signal processing device; the method comprises the steps of dynamically adjusting the interval of the corresponding sub-channels of each channel of broadcast signals, configuring a filter for the corresponding sub-channel of each channel of broadcast signals, detecting whether signal interference exists in the broadcast signal processing device in real time according to a built-in monitoring module of the broadcast signal processing device, precisely controlling the transmitting power of each channel of broadcast signals, and transmitting the transmitting power of each channel of broadcast signals to a broadcast transmitter, so that the utilization of frequency spectrum resources can be effectively optimized, the cross interference among signals is reduced, the stable transmission of high-priority signals is ensured, and meanwhile, the transmission quality of the signals is improved through the configuration of the filter.
Description
Technical Field
The invention belongs to the technical field of multiplexing processing of broadcast signals, and relates to a multiplexing method of broadcast signals.
Background
With the rapid development of wireless communication technology, the coverage range and application scene of broadcast signals are continuously expanded, and the method covers a plurality of fields from traditional broadcast television to mobile communication, satellite communication, internet of things and the like. At the same time, the limited and diversified wireless devices of spectrum resources act together, so that spectrum multiplexing becomes a common technical means. However, under the condition of increasingly tense frequency spectrum resources, coexistence of various broadcast signals in the same frequency band or adjacent frequency bands brings about serious signal cross interference problems.
The signal cross interference not only can lead to the degradation of communication quality and the unstable signal reception, but also can cause the error of data transmission, and even can lead to the complete failure of receiving certain broadcast signals when serious. This interference problem is particularly acute in high density signal transmission environments such as dense deployments of multicast transmitters, cellular base stations, and other wireless communication devices in cities.
In existing frequency division multiplexing techniques, signals of multiple channels are transmitted simultaneously on the same communication medium, each channel occupying a different frequency band. Although this method improves the efficiency of spectrum use, cross interference is easily generated between channels due to the proximity of frequency bands, and particularly when signal strength is uneven or device performance is not uniform, the interference can significantly affect the reception quality of signals. Such interference not only reduces the reception quality of the signal, but may also lead to errors and reduced efficiency of data transmission.
Disclosure of Invention
In view of the above problems in the prior art, the present invention provides a multiplexing method of broadcast signals, which is used for solving the above technical problems.
In order to achieve the above and other objects, the present invention adopts the following technical scheme:
the invention provides a multiplexing method of broadcast signals, which comprises the following steps:
step S1, a broadcast signal processing device is used for receiving multipath broadcast signals from a broadcast tower, and the required bandwidth amount and the priority of each path of broadcast signals are determined according to a pre-analysis module embedded in the broadcast signal processing device;
step S2, dynamically adjusting the intervals of the sub-channels corresponding to the broadcasting signals according to the required bandwidth quantity and the priority of the broadcasting signals;
Step S3, configuring a filter for each channel of the corresponding sub-channel of the broadcast signal, and detecting whether the signal interference condition exists in the broadcast signal processing device in real time according to a monitoring module embedded in the broadcast signal processing device;
step S4, if the signal interference condition in the broadcast signal processing device is identified, dynamically adjusting the filter parameters of each time point in the sub-channel corresponding to each path of broadcast signal, otherwise, skipping step S4, and directly executing step S5;
And S5, accurately controlling the transmitting power of each path of broadcasting signals, transmitting the transmitting power of each path of broadcasting signals to a broadcasting transmitter, transmitting each path of broadcasting signals by the broadcasting transmitter according to the preset transmitting power, and outputting the signals to a broadcasting receiving device or other downstream devices.
The required bandwidth amount of each path of broadcast signal is determined by an exemplary method, and the specific determining process is as follows:
According to the pre-analysis module embedded in the broadcast signal processing device, sampling each path of broadcast signal continuously and constantly, and obtaining probability density function of each path of broadcast signal by using a statistical method K is the number of each broadcast signal, k=1, 2,..h, and thus the information entropy of each broadcast signal is calculated,Representing a differential sign;
for each path of broadcast signal, calculating its power spectral density N is the number of each successive instant, n=1, 2,..n, N is the total number of samples at successive instants,Refers to complex exponential functions in the discrete fourier transform,Sample values corresponding to the nth continuous time for the kth broadcast signal;
Thereby comprehensively determining the required bandwidth of each path of broadcast signal ,Coefficients for adjusting the entropy rate and the power spectral density effects respectively,A high frequency boundary and a low frequency boundary representing the main power component of the signal respectively,For the power spectral density of the kth broadcast signal, df represents a differential representation of the power spectral density.
The priority of each broadcast signal is determined by the following specific determining process:
Defining a priority scoring function Q:
NR, JC, SZ and XH respectively represent the content type weight, the emergency degree, the audience area and the signal quality of the broadcast signal; Each representing a predefined weight coefficient for adjusting the relative importance of each parameter in the priority score;
Collecting the content type weight, the emergency degree, the audience range area and the signal quality of each path of broadcast signals, substituting the content type weight, the emergency degree, the audience range area and the signal quality into a priority scoring function Q to obtain the priority scoring of each path of broadcast signals ;
The priority scores of all the broadcasting signals are arranged according to descending order, the arrangement order of the priority scores corresponding to all the broadcasting signals is obtained, and the arrangement order is used as the priority of all the broadcasting signals.
Exemplary, the interval of the corresponding sub-channels of each path of broadcast signal is dynamically adjusted, and the specific determining process is as follows:
constructing a broadcast signal resource allocation map according to the following rules:
defining nodes, wherein each node of the broadcast signal resource allocation diagram represents each path of broadcast signal;
Defining an edge, namely if the frequency band requirements of two broadcast signals are overlapped and the same sub-channel cannot be shared, one edge exists between the corresponding nodes of the two broadcast signals;
and (3) weight distribution, namely distributing weights to all nodes in the broadcast signal resource distribution diagram according to the required bandwidth quantity and the priority of each path of broadcast signal, wherein the calculation formula of the weight distribution of all nodes in the broadcast signal resource distribution diagram is as follows:
calculating to obtain the distribution weight value of each node in the broadcast signal resource distribution diagram ,And respectively representing preset coefficient factors for adjusting the influence of the required bandwidth and the priority, v is the number of each node in the broadcast signal resource allocation diagram, v=1, 2,..b,Respectively representing the bandwidth quantity and the priority required by a v-th node in a broadcast signal resource allocation diagram;
Sequentially arranging the distribution weight values of all nodes in the broadcast signal resource distribution diagram according to a sequence from high to low, and selecting the smallest available sub-channel for each node from the node with the highest distribution weight value;
acquiring basic interval of sub-channel in broadcast signal processing device and required bandwidth amount of each node corresponding to each adjacent node in broadcast signal resource allocation diagram U is the number of each neighboring node, u=1, 2,..g;
calculating intervals of sub-channels corresponding to all nodes in the broadcast signal resource allocation diagram JC is the basic interval of the sub-channel in the broadcasting signal processing device,A node set of adjacent nodes adjacent to each node in the broadcast signal resource allocation map,For an adjustment factor, for adjusting the interval according to the maximum required bandwidth amount;
and corresponding each node in the broadcast signal resource allocation map to each path of broadcast signal to obtain the interval of the corresponding sub-channel of each path of broadcast signal.
Exemplary, the detection logic for detecting whether a signal interference condition exists in the broadcast signal processing apparatus in real time is:
Numbering the broadcast signals of adjacent channels of the sub-channels corresponding to the broadcast signals of each channel, wherein the serial numbers are 1, 2;
Time domain expression for collecting each path of broadcast signals T is denoted as the time point;
and then calculate the power of each path of broadcast signal T is the total time point number in the integral time period, and dt represents the differential representation of the time point;
The time domain expression of each adjacent channel broadcast signal of the sub-channel corresponding to each broadcast signal is calculated in a same way according to the calculation mode of the time domain expression of each broadcast signal M is the number of each adjacent channel broadcast signal, m=1, 2,..m;
Comprehensive analysis to obtain cross-channel interference ratio of adjacent channel broadcast signals of sub-channels corresponding to each channel of broadcast signals in the broadcast signal processing device ;
Comparing the cross-channel interference ratio of each adjacent channel broadcast signal of each channel of the broadcast signal processing device with a set interference ratio threshold, if the cross-channel interference ratio of a certain adjacent channel broadcast signal of a certain channel of the broadcast signal corresponding sub-channel is larger than the set interference ratio threshold, judging that the signal interference condition exists in the broadcast signal processing device, otherwise, judging that the signal interference condition does not exist in the broadcast signal processing device.
Illustratively, the filter parameters of the corresponding sub-channels of each broadcast signal include a step size and a bandwidth.
Exemplary, the filter step length of each time point in the sub-channel corresponding to each path of broadcast signal is dynamically adjusted, and the specific adjustment process is as follows:
If the cross-channel interference ratio of a broadcast signal of a certain adjacent channel of a sub-channel corresponding to a certain broadcast signal is larger than a set interference ratio threshold, marking the sub-channel corresponding to the broadcast signal as a target adjustment channel, and counting to obtain all target adjustment channels in the broadcast signal processing device;
collecting output signals of sub-channel filters in each target adjustment channel corresponding to each time point in real time Thereby calculating error signals of the sub-channel filters corresponding to each target adjustment channel in each time point,Adjusting the expected signal of the sub-channel filter in the channel corresponding to the t time point for the c target; c is the number of each target adjustment channel, c=1, 2,..e;
Calculating the error signal change rate of the sub-channel filter in each time point corresponding to each target adjustment channel through an analysis formula ,Respectively adjusting error signals of the sub-channel filters in the time points t+1 and t-1 corresponding to the c target adjustment channel;
Calculating the filter step length of each target adjustment channel corresponding to each time point ,For the initial step size of the filter in the broadcast signal processing apparatus,In particular a predefined calculation constant,For preventing the step size from being too large or too small,For controlling the range of variation of the step size,A preset calculation constant for preventing the root number from being zero;
If the cross-channel interference ratio of the broadcast signal of a certain adjacent channel of the sub-channel corresponding to a certain broadcast signal is larger than a set interference ratio threshold, the sub-channel corresponding to the certain broadcast signal is marked as a target adjustment channel, the filter step length of each time point corresponding to the target adjustment channel is used as the filter step length of each time point in the sub-channel corresponding to the certain broadcast signal, corresponding adjustment is carried out, and if the cross-channel interference ratio of the broadcast signal of the adjacent channel of the sub-channel corresponding to the certain broadcast signal is smaller than or equal to the set interference ratio threshold, the adjustment value of the filter step length of each time point corresponding to the target adjustment channel is marked as 0.
Exemplary, the filter bandwidth of each time point in the sub-channel corresponding to each broadcast signal is dynamically adjusted, and the specific adjustment process is as follows:
calculating the bandwidth of the filter corresponding to each time point of each target adjustment channel ,In particular the signal-to-noise ratio and the error signal correspond to the adjustment factors of the filter bandwidth,A predefined calculation constant for controlling the amplitude of the variation of the bandwidth; for the control factor, for adjusting the rate of change of the bandwidth, The signal to noise ratio of the sub-channel filter at the t-th time point corresponding to the c-th target adjustment channel,Maximum bandwidth is allowed for a filter in the broadcast signal processing apparatus;
If the cross-channel interference ratio of the broadcast signal of a certain adjacent channel of the sub-channel corresponding to a certain broadcast signal is larger than a set interference ratio threshold, the sub-channel corresponding to the certain broadcast signal is marked as a target adjustment channel, the filter bandwidth of each time point corresponding to the target adjustment channel is used as the filter bandwidth of each time point in the sub-channel corresponding to the certain broadcast signal, corresponding adjustment is carried out, and if the cross-channel interference ratio of the broadcast signal of the adjacent channel of the sub-channel corresponding to the certain broadcast signal is smaller than or equal to the set interference ratio threshold, the adjustment value of the filter bandwidth of each time point corresponding to the target adjustment channel is marked as 0.
Exemplary, the method for precisely controlling the transmitting power of each path of broadcast signal comprises the following steps:
Estimating power path loss of each path of broadcast signal GS is a unit value of the speed of light,Respectively representing the distance between the kth broadcast signal transmitter and the receiver and the signal frequency;
thereby obtaining the transmitting power of each path of broadcast signals Wherein the transmitting power of each path of broadcast signalIs defined asG1 and G2 are gain values of the transmit antenna and the receive antenna respectively,A minimum signal-to-noise threshold maintained for a predefined receiving end.
As described above, the multiplexing method of broadcast signals provided by the present invention has at least the following advantages:
(1) The multiplexing method of the broadcast signals comprises the specific steps that a broadcast signal processing device is used for receiving multipath broadcast signals from a broadcast tower, the required bandwidth and the priority of each path of broadcast signals are determined according to a pre-analysis module embedded in the broadcast signal processing device, the interval of the corresponding sub-channels of each path of broadcast signals is dynamically adjusted according to the required bandwidth and the priority of each path of broadcast signals, filters are configured for the corresponding sub-channels of each path of broadcast signals, whether signal interference conditions exist in the broadcast signal processing device or not is detected in real time according to a monitoring module embedded in the broadcast signal processing device, the transmitting power of each path of broadcast signals is accurately controlled, the transmitting power of each path of broadcast signals is sent to a broadcast transmitter, the broadcast transmitter transmits each path of broadcast signals according to the preset transmitting power, the utilization of spectrum resources can be effectively optimized, cross interference among the signals is reduced, stable transmission of signals with high priority is ensured, and meanwhile the transmission quality of the signals is improved through the configuration of the filters. The signal transmitting power is precisely controlled through a real-time monitoring and feedback mechanism, so that the transmission efficiency and reliability of broadcast signals are effectively improved;
(2) While the conventional static spectrum allocation method is difficult to cope with complex signal environments, the embodiment of the invention can dynamically adapt to the changing communication requirements along with the increase of the variety and the quantity of broadcast signals by real-time adjustment and power control, thereby avoiding signal collision and interference.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram showing the connection of the steps of the method of the present invention.
Detailed Description
The foregoing is merely illustrative of the principles of the invention, and various modifications, additions and substitutions for those skilled in the art will be apparent to those having ordinary skill in the art without departing from the principles of the invention or from the scope of the invention as defined in the accompanying claims.
Example 1
Referring to fig. 1, a multiplexing method of broadcast signals includes the steps of:
step S1, a broadcast signal processing device is used for receiving multipath broadcast signals from a broadcast tower, and the required bandwidth amount and the priority of each path of broadcast signals are determined according to a pre-analysis module embedded in the broadcast signal processing device;
on the basis of the above embodiment, the required bandwidth amount of each path of broadcast signal is determined, and the specific determining process is as follows:
According to the pre-analysis module embedded in the broadcast signal processing device, sampling each path of broadcast signal continuously and constantly, and obtaining probability density function of each path of broadcast signal by using a statistical method K is the number of each broadcast signal, k=1, 2,..h, and thus the information entropy of each broadcast signal is calculated,Representing a differential sign;
for each path of broadcast signal, calculating its power spectral density N is the number of each successive instant, n=1, 2,..n, N is the total number of samples at successive instants,Refers to complex exponential functions in the discrete fourier transform,Sample values corresponding to the nth continuous time for the kth broadcast signal;
Thereby comprehensively determining the required bandwidth of each path of broadcast signal ,Coefficients for adjusting the entropy rate and the power spectral density effects respectively,A high frequency boundary and a low frequency boundary representing the main power component of the signal respectively,For the power spectral density of the kth broadcast signal, df represents a differential representation of the power spectral density.
On the basis of the above embodiment, the priority of each broadcast signal is determined, and the specific determining process is as follows:
Defining a priority scoring function Q:
NR, JC, SZ and XH respectively represent the content type weight, the emergency degree, the audience area and the signal quality of the broadcast signal; Each representing a predefined weight coefficient for adjusting the relative importance of each parameter in the priority score;
NR (content type weight)
Different weights are given according to the type of broadcast signal content (news, entertainment, education, etc.). For example, news may have a higher priority than entertainment content.
These weights can be dynamically adjusted according to the current demands of society.
Jc (degree of urgency):
indicating the urgency of the broadcast signal content. For example, natural disaster alarms, major events, etc. will get higher weight, a binary score, urgent content gets high score, and non-urgent content gets low score.
Sz (audience area):
Representing the expected audience area size of the broadcast signal. The wider the audience for which the broadcast content is targeted, the higher its priority can be estimated by historical listening data or audience surveys.
Xh (signal quality):
The technical quality of the broadcast signal, such as signal-to-noise ratio (SNR), bit Error Rate (BER) and the like, and the high-quality signal shows that the transmission effect is good, and the processing and broadcasting are easier;
Collecting the content type weight, the emergency degree, the audience range area and the signal quality of each path of broadcast signals, substituting the content type weight, the emergency degree, the audience range area and the signal quality into a priority scoring function Q to obtain the priority scoring of each path of broadcast signals ;
The priority scores of all the broadcasting signals are arranged according to descending order, the arrangement order of the priority scores corresponding to all the broadcasting signals is obtained, and the arrangement order is used as the priority of all the broadcasting signals.
Wherein the priority score ranks the first broadcast signal as having the highest priority.
Step S2, dynamically adjusting the intervals of the sub-channels corresponding to the broadcasting signals according to the required bandwidth quantity and the priority of the broadcasting signals;
on the basis of the above embodiment, the interval of the sub-channels corresponding to each path of broadcast signal is dynamically adjusted, and the specific determining process is as follows:
constructing a broadcast signal resource allocation map according to the following rules:
defining nodes, wherein each node of the broadcast signal resource allocation diagram represents each path of broadcast signal;
defining an edge, namely if the frequency band requirements of two broadcast signals are overlapped or the same sub-channel cannot be shared for other reasons (such as the same geographic position), one edge exists between corresponding nodes of the two broadcast signals;
and (3) weight distribution, namely distributing weights to all nodes in the broadcast signal resource distribution diagram according to the required bandwidth quantity and the priority of each path of broadcast signal, wherein the calculation formula of the weight distribution of all nodes in the broadcast signal resource distribution diagram is as follows:
calculating to obtain the distribution weight value of each node in the broadcast signal resource distribution diagram ,And respectively representing preset coefficient factors for adjusting the influence of the required bandwidth and the priority, v is the number of each node in the broadcast signal resource allocation diagram, v=1, 2,..b,Respectively representing the bandwidth quantity and the priority required by a v-th node in a broadcast signal resource allocation diagram;
Sequentially arranging the distribution weight values of all nodes in the broadcast signal resource distribution diagram according to a sequence from high to low, and selecting the smallest available sub-channel for each node from the node with the highest distribution weight value;
acquiring basic interval of sub-channel in broadcast signal processing device and required bandwidth amount of each node corresponding to each adjacent node in broadcast signal resource allocation diagram U is the number of each neighboring node, u=1, 2,..g;
calculating intervals of sub-channels corresponding to all nodes in the broadcast signal resource allocation diagram JC is the basic interval of the sub-channel in the broadcasting signal processing device,A node set of adjacent nodes adjacent to each node in the broadcast signal resource allocation map,For an adjustment factor, for adjusting the interval according to the maximum required bandwidth amount;
and corresponding each node in the broadcast signal resource allocation map to each path of broadcast signal to obtain the interval of the corresponding sub-channel of each path of broadcast signal.
It is to be added that the sliding window technology is used to calculate the service quality violation rate WY, the bandwidth shortage rate BZ and the interference event rate GR of the broadcast signal processing device corresponding to the past period of time;
From which to calculate respectively And:
;
;
;
Representing coefficients previously used to weight the required bandwidth amount impact and the weighted priority impact respectively,Coefficients that were previously used for weighting adjustment factors; Respectively representing predefined adjustment coefficients;
representing the extent to which the amount of required bandwidth has affected the weight of the broadcast signal during a previous evaluation or adjustment period;
Representing the extent to which the priority has had an impact on the broadcast signal weight during a previous evaluation or adjustment period.
The relevance of the operation flow of step S2 is:
Signals of high weight indicate a high priority or a high bandwidth requirement, which generally means that a larger subchannel spacing is required to guarantee their performance and reduce interference;
through weight sequencing and interval adjustment, better frequency resources can be preferentially allocated to important or needed signals, and meanwhile, through proper interval management, the spectrum efficiency and communication quality of the whole network are ensured;
Dynamic adjustment of weights and intervals allows the network to flexibly cope with various operating conditions and demand changes, such as peak traffic or changing demands for different types of services.
Step S3, configuring a filter for each channel of the corresponding sub-channel of the broadcast signal, and detecting whether the signal interference condition exists in the broadcast signal processing device in real time according to a monitoring module embedded in the broadcast signal processing device;
Based on the above embodiment, the detection logic for detecting whether the signal interference condition exists in the broadcast signal processing apparatus in real time is:
Numbering the broadcast signals of adjacent channels of the sub-channels corresponding to the broadcast signals of each channel, wherein the serial numbers are 1, 2;
Time domain expression for collecting each path of broadcast signals T is denoted as the time point;
and then calculate the power of each path of broadcast signal T is the total time point number in the integral time period, a signal period is usually selected, and dt represents the differential representation of the time point;
The time domain expression of each adjacent channel broadcast signal of the sub-channel corresponding to each broadcast signal is calculated in a same way according to the calculation mode of the time domain expression of each broadcast signal M is the number of each adjacent channel broadcast signal, m=1, 2,..m;
Comprehensive analysis to obtain cross-channel interference ratio of adjacent channel broadcast signals of sub-channels corresponding to each channel of broadcast signals in the broadcast signal processing device ;
The cross-channel interference ratio of each adjacent channel broadcast signal of each channel broadcast signal corresponding to the sub-channel in the broadcast signal processing device represents the proportion of the kth channel broadcast signal interfered by the mth adjacent channel broadcast signal. If the value is larger, the interference of the kth broadcasting signal relative to the mth adjacent broadcasting signal is smaller, otherwise, the interference of the kth broadcasting signal is larger;
Comparing the cross-channel interference ratio of each adjacent channel broadcast signal of each channel of the broadcast signal processing device with a set interference ratio threshold, if the cross-channel interference ratio of a certain adjacent channel broadcast signal of a certain channel of the broadcast signal corresponding sub-channel is larger than the set interference ratio threshold, judging that the signal interference condition exists in the broadcast signal processing device, otherwise, judging that the signal interference condition does not exist in the broadcast signal processing device.
Step S4, if the signal interference condition in the broadcast signal processing device is identified, dynamically adjusting the filter parameters of each time point in the sub-channel corresponding to each path of broadcast signal, otherwise, skipping step S4, and directly executing step S5;
On the basis of the embodiment, the filter parameters of the corresponding sub-channels of each broadcast signal comprise step sizes and bandwidths.
The choice of the filter step size is critical in that if the filter step size is too large, the filter may diverge and not converge steadily. If the step length of the filter is too small, the convergence speed of the filter is very slow and can not adapt to the changed signal environment in time;
On the basis of the above embodiment, the step sizes of the filters at each time point in the sub-channels corresponding to each path of broadcast signals are dynamically adjusted, and the specific adjustment process is as follows:
If the cross-channel interference ratio of a broadcast signal of a certain adjacent channel of a sub-channel corresponding to a certain broadcast signal is larger than a set interference ratio threshold, marking the sub-channel corresponding to the broadcast signal as a target adjustment channel, and counting to obtain all target adjustment channels in the broadcast signal processing device;
collecting output signals of sub-channel filters in each target adjustment channel corresponding to each time point in real time Thereby calculating error signals of the sub-channel filters corresponding to each target adjustment channel in each time point,Adjusting the expected signal of the sub-channel filter in the channel corresponding to the t time point for the c target; c is the number of each target adjustment channel, c=1, 2,..e;
Calculating the error signal change rate of the sub-channel filter in each time point corresponding to each target adjustment channel through an analysis formula ,Respectively adjusting error signals of the sub-channel filters in the time points t+1 and t-1 corresponding to the c target adjustment channel;
Calculating the filter step length of each target adjustment channel corresponding to each time point ,For the initial step size of the filter in the broadcast signal processing apparatus,In particular a predefined calculation constant,For preventing the step size from being too large or too small,For controlling the range of variation of the step size,A preset calculation constant for preventing the root number from being zero;
If the cross-channel interference ratio of the broadcast signal of a certain adjacent channel of the sub-channel corresponding to a certain broadcast signal is larger than a set interference ratio threshold, the sub-channel corresponding to the certain broadcast signal is marked as a target adjustment channel, the filter step length of each time point corresponding to the target adjustment channel is used as the filter step length of each time point in the sub-channel corresponding to the certain broadcast signal, corresponding adjustment is carried out, and if the cross-channel interference ratio of the broadcast signal of the adjacent channel of the sub-channel corresponding to the certain broadcast signal is smaller than or equal to the set interference ratio threshold, the adjustment value of the filter step length of each time point corresponding to the target adjustment channel is marked as 0.
On the basis of the above embodiment, the filter bandwidths of the time points in the sub-channels corresponding to the broadcast signals in each channel are dynamically adjusted, and the specific adjustment process is as follows:
calculating the bandwidth of the filter corresponding to each time point of each target adjustment channel ,In particular the signal-to-noise ratio and the error signal correspond to the adjustment factors of the filter bandwidth,A predefined calculation constant for controlling the amplitude of the variation of the bandwidth; for the control factor, for adjusting the rate of change of the bandwidth, The signal to noise ratio of the sub-channel filter at the t-th time point corresponding to the c-th target adjustment channel,Maximum bandwidth is allowed for a filter in the broadcast signal processing apparatus;
If the cross-channel interference ratio of the broadcast signal of a certain adjacent channel of the sub-channel corresponding to a certain broadcast signal is larger than a set interference ratio threshold, the sub-channel corresponding to the certain broadcast signal is marked as a target adjustment channel, the filter bandwidth of each time point corresponding to the target adjustment channel is used as the filter bandwidth of each time point in the sub-channel corresponding to the certain broadcast signal, corresponding adjustment is carried out, and if the cross-channel interference ratio of the broadcast signal of the adjacent channel of the sub-channel corresponding to the certain broadcast signal is smaller than or equal to the set interference ratio threshold, the adjustment value of the filter bandwidth of each time point corresponding to the target adjustment channel is marked as 0.
When the error signal is large, the bandwidth narrows and the filter is more focused on suppressing the interference. The bandwidth may be relaxed to allow more signal to pass when the error signal is small, and close to when the signal to noise ratio is highMore signals are allowed to pass through, and when the signal-to-noise ratio is low, the bandwidth is narrowed, and the interference is reduced.
And S5, accurately controlling the transmitting power of each path of broadcasting signals, transmitting the transmitting power of each path of broadcasting signals to a broadcasting transmitter, transmitting each path of broadcasting signals by the broadcasting transmitter according to the preset transmitting power, and outputting the signals to a broadcasting receiving device or other downstream devices.
On the basis of the above embodiment, the method for precisely controlling the transmitting power of each path of broadcast signal includes the following steps:
Estimating power path loss of each path of broadcast signal GS is a unit value of the speed of light,Respectively representing the distance between the kth broadcast signal transmitter and the receiver and the signal frequency;
thereby obtaining the transmitting power of each path of broadcast signals Wherein the transmitting power of each path of broadcast signalIs defined asG1 and G2 are gain values of the transmit antenna and the receive antenna respectively,A minimum signal-to-noise threshold maintained for a predefined receiving end.
It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.
It should be understood that determining B from a does not mean determining B from a alone, but can also determine B from a and/or other information.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Finally, the foregoing description of the preferred embodiment of the invention is provided for the purpose of illustration only, and is not intended to limit the invention to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (9)
1. A multiplexing method of broadcast signals, comprising:
step S1, a broadcast signal processing device is used for receiving multipath broadcast signals from a broadcast tower, and the required bandwidth amount and the priority of each path of broadcast signals are determined according to a pre-analysis module embedded in the broadcast signal processing device;
step S2, dynamically adjusting the intervals of the sub-channels corresponding to the broadcasting signals according to the required bandwidth quantity and the priority of the broadcasting signals;
Step S3, configuring a filter for each channel of the corresponding sub-channel of the broadcast signal, and detecting whether the signal interference condition exists in the broadcast signal processing device in real time according to a monitoring module embedded in the broadcast signal processing device;
step S4, if the signal interference condition in the broadcast signal processing device is identified, dynamically adjusting the filter parameters of each time point in the sub-channel corresponding to each path of broadcast signal, otherwise, skipping step S4, and directly executing step S5;
And S5, accurately controlling the transmitting power of each path of broadcasting signals, transmitting the transmitting power of each path of broadcasting signals to a broadcasting transmitter, transmitting each path of broadcasting signals by the broadcasting transmitter according to the preset transmitting power, and outputting the signals to a broadcasting receiving device or other downstream devices.
2. The multiplexing method of broadcast signals according to claim 1, wherein the determining the required bandwidth amount of each broadcast signal comprises:
According to the pre-analysis module embedded in the broadcast signal processing device, sampling each path of broadcast signal continuously and constantly, and obtaining probability density function of each path of broadcast signal by using a statistical method K is the number of each broadcast signal, k=1, 2,..h, and thus the information entropy of each broadcast signal is calculated,Representing a differential sign;
for each path of broadcast signal, calculating its power spectral density N is the number of each successive instant, n=1, 2,..n, N is the total number of samples at successive instants,Refers to complex exponential functions in the discrete fourier transform,Sample values corresponding to the nth continuous time for the kth broadcast signal;
Thereby comprehensively determining the required bandwidth of each path of broadcast signal ,Coefficients for adjusting the entropy rate and the power spectral density effects respectively,A high frequency boundary and a low frequency boundary representing the main power component of the signal respectively,For the power spectral density of the kth broadcast signal, df represents a differential representation of the power spectral density.
3. The multiplexing method of broadcast signals according to claim 1, wherein the priority of each broadcast signal is determined by the following specific determining process:
Defining a priority scoring function Q:
NR, JC, SZ and XH respectively represent the content type weight, the emergency degree, the audience area and the signal quality of the broadcast signal; Each representing a predefined weight coefficient for adjusting the relative importance of each parameter in the priority score;
Collecting the content type weight, the emergency degree, the audience range area and the signal quality of each path of broadcast signals, substituting the content type weight, the emergency degree, the audience range area and the signal quality into a priority scoring function Q to obtain the priority scoring of each path of broadcast signals ;
The priority scores of all the broadcasting signals are arranged according to descending order, the arrangement order of the priority scores corresponding to all the broadcasting signals is obtained, and the arrangement order is used as the priority of all the broadcasting signals.
4. The multiplexing method of broadcast signals according to claim 1, wherein the interval of the corresponding sub-channels of each broadcast signal is dynamically adjusted, and the specific determining process is as follows:
constructing a broadcast signal resource allocation map according to the following rules:
defining nodes, wherein each node of the broadcast signal resource allocation diagram represents each path of broadcast signal;
Defining an edge, namely if the frequency band requirements of two broadcast signals are overlapped and the same sub-channel cannot be shared, one edge exists between the corresponding nodes of the two broadcast signals;
and (3) weight distribution, namely distributing weights to all nodes in the broadcast signal resource distribution diagram according to the required bandwidth quantity and the priority of each path of broadcast signal, wherein the calculation formula of the weight distribution of all nodes in the broadcast signal resource distribution diagram is as follows:
calculating to obtain the distribution weight value of each node in the broadcast signal resource distribution diagram ,And respectively representing preset coefficient factors for adjusting the influence of the required bandwidth and the priority, v is the number of each node in the broadcast signal resource allocation diagram, v=1, 2,..b,Respectively representing the bandwidth quantity and the priority required by a v-th node in a broadcast signal resource allocation diagram;
Sequentially arranging the distribution weight values of all nodes in the broadcast signal resource distribution diagram according to a sequence from high to low, and selecting the smallest available sub-channel for each node from the node with the highest distribution weight value;
acquiring basic interval of sub-channel in broadcast signal processing device and required bandwidth amount of each node corresponding to each adjacent node in broadcast signal resource allocation diagram U is the number of each neighboring node, u=1, 2,..g;
calculating intervals of sub-channels corresponding to all nodes in the broadcast signal resource allocation diagram JC is the basic interval of the sub-channel in the broadcasting signal processing device,A node set of adjacent nodes adjacent to each node in the broadcast signal resource allocation map,For an adjustment factor, for adjusting the interval according to the maximum required bandwidth amount;
and corresponding each node in the broadcast signal resource allocation map to each path of broadcast signal to obtain the interval of the corresponding sub-channel of each path of broadcast signal.
5. The multiplexing method of broadcast signals according to claim 1, wherein the detection logic for detecting in real time whether a signal interference condition exists in the broadcast signal processing apparatus comprises:
Numbering the broadcast signals of adjacent channels of the sub-channels corresponding to the broadcast signals of each channel, wherein the serial numbers are 1, 2;
Time domain expression for collecting each path of broadcast signals T is denoted as the time point;
and then calculate the power of each path of broadcast signal T is the total time point number in the integral time period, and dt represents the differential representation of the time point;
The time domain expression of each adjacent channel broadcast signal of the sub-channel corresponding to each broadcast signal is calculated in a same way according to the calculation mode of the time domain expression of each broadcast signal M is the number of each adjacent channel broadcast signal, m=1, 2,..m;
Comprehensive analysis to obtain cross-channel interference ratio of adjacent channel broadcast signals of sub-channels corresponding to each channel of broadcast signals in the broadcast signal processing device ;
Comparing the cross-channel interference ratio of each adjacent channel broadcast signal of each channel of the broadcast signal processing device with a set interference ratio threshold, if the cross-channel interference ratio of a certain adjacent channel broadcast signal of a certain channel of the broadcast signal corresponding sub-channel is larger than the set interference ratio threshold, judging that the signal interference condition exists in the broadcast signal processing device, otherwise, judging that the signal interference condition does not exist in the broadcast signal processing device.
6. A method of multiplexing broadcast signals according to claim 1, wherein the filter parameters of the corresponding sub-channels of each broadcast signal include a step size and a bandwidth.
7. The multiplexing method of broadcast signals according to claim 6, wherein the step sizes of filters at each time point in the sub-channels corresponding to each broadcast signal are dynamically adjusted, and the specific adjustment process is as follows:
If the cross-channel interference ratio of a broadcast signal of a certain adjacent channel of a sub-channel corresponding to a certain broadcast signal is larger than a set interference ratio threshold, marking the sub-channel corresponding to the broadcast signal as a target adjustment channel, and counting to obtain all target adjustment channels in the broadcast signal processing device;
collecting output signals of sub-channel filters in each target adjustment channel corresponding to each time point in real time Thereby calculating error signals of the sub-channel filters corresponding to each target adjustment channel in each time point,Adjusting the expected signal of the sub-channel filter in the channel corresponding to the t time point for the c target; c is the number of each target adjustment channel, c=1, 2,..e;
Calculating the error signal change rate of the sub-channel filter in each time point corresponding to each target adjustment channel through an analysis formula ,Respectively adjusting error signals of the sub-channel filters in the time points t+1 and t-1 corresponding to the c target adjustment channel;
Calculating the filter step length of each target adjustment channel corresponding to each time point ,For the initial step size of the filter in the broadcast signal processing apparatus,In particular a predefined calculation constant,A preset calculation constant for preventing the root number from being zero;
If the cross-channel interference ratio of the broadcast signal of a certain adjacent channel of the sub-channel corresponding to a certain broadcast signal is larger than a set interference ratio threshold, the sub-channel corresponding to the certain broadcast signal is marked as a target adjustment channel, the filter step length of each time point corresponding to the target adjustment channel is used as the filter step length of each time point in the sub-channel corresponding to the certain broadcast signal, corresponding adjustment is carried out, and if the cross-channel interference ratio of the broadcast signal of the adjacent channel of the sub-channel corresponding to the certain broadcast signal is smaller than or equal to the set interference ratio threshold, the adjustment value of the filter step length of each time point corresponding to the target adjustment channel is marked as 0.
8. The multiplexing method of broadcasting signals as set forth in claim 7, wherein the filter bandwidths of the time points in the corresponding sub-channels of each broadcasting signal are dynamically adjusted, and the specific adjustment process is as follows:
calculating the bandwidth of the filter corresponding to each time point of each target adjustment channel ,In particular the signal-to-noise ratio and the error signal correspond to the adjustment factors of the filter bandwidth,A predefined calculation constant for controlling the amplitude of the variation of the bandwidth; for the control factor, for adjusting the rate of change of the bandwidth, The signal to noise ratio of the sub-channel filter at the t-th time point corresponding to the c-th target adjustment channel,Maximum bandwidth is allowed for a filter in the broadcast signal processing apparatus;
If the cross-channel interference ratio of the broadcast signal of a certain adjacent channel of the sub-channel corresponding to a certain broadcast signal is larger than a set interference ratio threshold, the sub-channel corresponding to the certain broadcast signal is marked as a target adjustment channel, the filter bandwidth of each time point corresponding to the target adjustment channel is used as the filter bandwidth of each time point in the sub-channel corresponding to the certain broadcast signal, corresponding adjustment is carried out, and if the cross-channel interference ratio of the broadcast signal of the adjacent channel of the sub-channel corresponding to the certain broadcast signal is smaller than or equal to the set interference ratio threshold, the adjustment value of the filter bandwidth of each time point corresponding to the target adjustment channel is marked as 0.
9. The multiplexing method of broadcasting signals as set forth in claim 1, wherein the transmission power of each broadcasting signal is precisely controlled, comprising the steps of:
Estimating power path loss of each path of broadcast signal GS is a unit value of the speed of light,Respectively representing the distance between the kth broadcast signal transmitter and the receiver and the signal frequency;
thereby obtaining the transmitting power of each path of broadcast signals Wherein the transmitting power of each path of broadcast signalIs defined asG1 and G2 are gain values of the transmit antenna and the receive antenna respectively,A minimum signal-to-noise threshold maintained for a predefined receiving end,For each adjacent channel broadcast signal of each channel broadcast signal corresponding to a sub-channel,Is the power spectral density of the kth broadcast signal.
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