CN111711594A - Single-frequency interference processing method and device - Google Patents
Single-frequency interference processing method and device Download PDFInfo
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- CN111711594A CN111711594A CN202010699217.1A CN202010699217A CN111711594A CN 111711594 A CN111711594 A CN 111711594A CN 202010699217 A CN202010699217 A CN 202010699217A CN 111711594 A CN111711594 A CN 111711594A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
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- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
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Abstract
The invention provides a single-frequency interference processing method and a single-frequency interference processing device, wherein the method comprises the following steps: determining the position of single-frequency interference of an Orthogonal Frequency Division Multiplexing (OFDM) symbol subcarrier; the method comprises the steps of expanding a subcarrier or an adjacent subcarrier at the position of single-frequency interference in OFDM symbol subcarriers into a virtual subcarrier according to the position of the single-frequency interference, so that the problems of interference signal suppression through a frequency spectrum zero setting method, complex structure, high realization difficulty and high cost in the related technology can be solved, and the subcarrier at the position of the single-frequency interference or the adjacent position is set as the virtual subcarrier which is not influenced by the single-frequency interference due to the fact that the virtual subcarrier does not bear data, so that the method is low in cost and easy to realize.
Description
Technical Field
The invention relates to the field of image processing, in particular to a single-frequency interference processing method and device.
Background
In an Orthogonal Frequency Division Multiplexing (OFDM) communication system, single Frequency interference is concentrated on one or several continuous subcarriers, and even single Frequency interference with very small energy may have a serious influence on the demodulation performance of OFDM. When the position of the single-frequency interference on the frequency domain is just coincident with a certain subcarrier of the effective signal (called as orthogonal single-frequency interference), the signal-to-noise ratio of the subcarrier at the position of the single-frequency interference frequency is seriously reduced, but the interference of the subcarrier on the adjacent subcarrier is zero; when the interference frequency is not coincident with the subcarrier but still within the frequency range of the effective signal (referred to as non-orthogonal single frequency interference), due to spectrum leakage caused by Fast Fourier Transform (FFT) window effect of the receiving end, the spectrum of the non-orthogonal single frequency interference is spread within the frequency range of the entire effective signal, and affects a plurality of subcarriers within a large bandwidth range, resulting in a serious decrease in the output snr of the plurality of subcarriers near the single frequency interference frequency.
In the related art, a time domain trap method is proposed, in which a trap filter of a corresponding frequency point is performed in a time domain, and the trap filter may be implemented by a Finite Impulse Response (FIR) filter or an Infinite Impulse Response (IIR) filter.
The related technology also provides a time domain wave trap and frequency domain power optimization combination method, for the detected single-frequency interference, a wave trap filter is adopted in the time domain to filter the single-frequency interference, and the signal power is adjusted based on digital automatic gain control, so that the signal input power is stabilized at the optimal input power; and shielding the sub-carriers affected by the single-frequency interference in the frequency domain, so that the sub-carriers affected by the single-frequency interference are not used for data transmission.
The notch filtering method is a method of filtering a signal by a notch filter, and in order to suppress single-frequency interference, the notch filter is required to have a particularly narrow frequency band, and when an interfering signal is in the passband of a useful signal, the frequency spectrum and waveform of the useful signal are distorted while suppressing the interfering signal, regardless of an IIR or FIR notch filter.
In view of the above problems, a single-frequency strong interference suppression system applied to an energy-carrying communication system is also provided in the related art, and includes a directional coupler, an amplitude stabilizing module, a frequency conversion channel, and a power combiner (as shown in fig. 1), and combines the concept of radio frequency cancellation, and uses a phase-locked loop to generate a reference signal having the same amplitude as an interference signal by a spectrum nulling method, and then adjusts a phase shifter to make the phase of the reference signal opposite to that of the interference signal, so that the phases such as amplitude and phase are opposite to each other when the interference signal and the reference signal are superimposed, and thus the interference signal is suppressed more thoroughly. The frequency spectrum zero setting method has the advantages of complex structure, high implementation difficulty and high cost.
Aiming at the problems of complex structure, high realization difficulty and high cost of the interference signal suppression by a frequency spectrum zero setting method in the related technology, no solution is provided.
Disclosure of Invention
The embodiment of the invention provides a single-frequency interference processing method and a single-frequency interference processing device, which are used for at least solving the problems of complex structure, high realization difficulty and high cost of interference signal suppression through a frequency spectrum zero setting method in the related technology.
According to an embodiment of the present invention, a single frequency interference processing method is provided, including:
determining the position of single-frequency interference of an OFDM symbol subcarrier;
and expanding the sub-carrier or the adjacent sub-carrier at the position of the single-frequency interference in the OFDM symbol sub-carriers into the virtual sub-carrier according to the position of the single-frequency interference.
Optionally, the determining the location of the single frequency interference comprises:
acquiring position signals of edge pilots of OFDM symbol subcarriers to obtain a first position sequence number and a second position signal, wherein the first position sequence number is smaller than the second position sequence number, the OFDM symbol subcarriers comprise virtual subcarriers at two sides and effective subcarriers in the middle, a plurality of pilots are inserted into the effective subcarriers, and the plurality of pilots comprise the edge pilots;
acquiring a target position serial number of the position of the single-frequency interference;
if the target position serial number is smaller than the first position serial number or the target position serial number is larger than the second position serial number, determining that the single-frequency interference is on the outer side of the edge pilot frequency;
and if the target position sequence number is greater than or equal to the first position sequence number and the target position sequence number is less than or equal to the second position sequence number, determining that the single-frequency interference is on the inner side of the edge pilot frequency.
Optionally, expanding the subcarrier or the adjacent subcarrier at the position of the single-frequency interference to the virtual subcarrier according to the position of the single-frequency interference includes:
if the single-frequency interference is on the outer side of the edge pilot frequency, expanding the sub-carrier or the adjacent sub-carrier at the position of the single-frequency interference into the virtual sub-carrier in a mode of expanding the outer virtual sub-carrier;
if the single-frequency interference is on the inner side of the edge pilot frequency, judging whether a preset transmission rate is met after a subcarrier or an adjacent subcarrier at the position of the single-frequency interference is expanded into the virtual subcarrier in a mode of expanding an outer virtual subcarrier;
if the judgment result is yes, expanding the sub-carrier or the adjacent sub-carrier at the position of the single-frequency interference into the virtual sub-carrier in a mode of expanding the outer virtual sub-carrier, and if the expanded virtual sub-carrier occupies the pilot frequency, reconfiguring the plurality of pilot frequencies in the expanded effective sub-carrier;
and under the condition that the judgment result is negative, only the sub-carrier or the adjacent sub-carrier at the position of the single-frequency interference is expanded into the virtual sub-carrier.
Optionally, expanding the subcarrier at the position of the single-frequency interference or the adjacent subcarrier to the virtual subcarrier by expanding an outer virtual subcarrier includes:
the sub-carrier at the position of the single-frequency interference and the sub-carriers outside the position of the single-frequency interference are expanded into the virtual sub-carrier, or
And expanding the adjacent subcarriers at the position of the single-frequency interference and the subcarriers outside the position of the single-frequency interference into the virtual subcarriers.
Optionally, the extending only the subcarrier or the adjacent subcarrier where the single frequency interference is located as the virtual subcarrier includes:
if the position of the single-frequency interference is superposed with one of the plurality of pilot frequencies, only the data subcarrier of the position of the single-frequency interference is expanded into the virtual subcarrier, and the adjacent subcarrier of the position of the target pilot frequency is expanded into a new pilot frequency;
and if the position of the single-frequency interference is superposed with the data subcarrier, only expanding the data subcarrier at the position of the single-frequency interference into the virtual subcarrier.
Optionally, the determining whether the subcarrier at the position of the single-frequency interference or the adjacent subcarrier is extended to the virtual subcarrier by extending the outer virtual subcarrier includes:
acquiring the number of expanded virtual subcarriers for expanding the subcarriers or adjacent subcarriers at the positions of the single-frequency interference into the virtual subcarriers by expanding the outer virtual subcarriers;
judging whether the number of the extended virtual subcarriers is less than the number of preset virtual subcarriers;
if so, determining that the preset transmission rate is met after the sub-carrier or the adjacent sub-carrier at the position of the single-frequency interference is expanded into the virtual sub-carrier in a manner of expanding the outer virtual sub-carrier;
and under the condition that the judgment result is negative, determining that the preset transmission rate is not satisfied after the subcarrier at the position of the single-frequency interference or the adjacent subcarrier is expanded into the virtual subcarrier in a mode of expanding the outer virtual subcarrier.
According to another embodiment of the present invention, there is also provided a single frequency interference processing apparatus, including:
the determining module is used for determining the position of single-frequency interference of the OFDM symbol subcarrier;
and the extension module is used for extending the sub-carrier or the adjacent sub-carrier at the position of the single-frequency interference in the OFDM symbol sub-carriers into the virtual sub-carrier according to the position of the single-frequency interference.
Optionally, the determining module includes:
a first obtaining sub-module, configured to obtain a position signal of an edge pilot of an OFDM symbol subcarrier to obtain a first position number and a second position signal, where the first position number is smaller than the second position number, the OFDM symbol subcarrier includes virtual subcarriers at two sides and an effective subcarrier in the middle, a plurality of pilots are inserted into the effective subcarrier, and the plurality of pilots include the edge pilot;
the second obtaining submodule is used for obtaining a target position serial number of the position where the single-frequency interference is located;
a first determining submodule, configured to determine that the single-frequency interference is on an outer side of the edge pilot if the target position sequence number is smaller than the first position sequence number or the target position sequence number is larger than the second position sequence number;
and the second determining submodule is used for determining that the single-frequency interference is positioned on the inner side of the edge pilot frequency if the target position sequence number is greater than or equal to the first position sequence number and the target position sequence number is less than or equal to the second position sequence number.
Optionally, the expansion module includes:
the first expansion sub-module is used for expanding the sub-carrier or the adjacent sub-carrier at the position of the single-frequency interference into the virtual sub-carrier in a mode of expanding the outer virtual sub-carrier if the single-frequency interference is positioned at the outer side of the edge pilot frequency;
the judging submodule is used for judging whether the preset transmission rate is met after the subcarriers or adjacent subcarriers at the positions of the single-frequency interference are expanded into the virtual subcarriers in a mode of expanding outer virtual subcarriers if the single-frequency interference is positioned at the inner side of the edge pilot frequency;
a second extension sub-module, configured to, if the determination result is yes, extend the sub-carrier where the single-frequency interference is located or an adjacent sub-carrier to the virtual sub-carrier in a manner of extending an outer virtual sub-carrier, and if the extended virtual sub-carrier occupies a pilot frequency, reconfigure the plurality of pilot frequencies in the extended effective sub-carrier;
and the third expansion sub-module is used for expanding the sub-carrier or the adjacent sub-carrier at the position of the single-frequency interference into the virtual sub-carrier under the condition that the judgment result is negative.
Optionally, the first extension submodule or the second extension submodule is further used for
The sub-carrier at the position of the single-frequency interference and the sub-carriers outside the position of the single-frequency interference are expanded into the virtual sub-carrier, or
And expanding the adjacent subcarriers at the position of the single-frequency interference and the subcarriers outside the position of the single-frequency interference into the virtual subcarriers.
Optionally, the third expansion submodule includes:
the first extension unit is used for extending the data subcarrier at the position of the single-frequency interference into the virtual subcarrier only and extending the adjacent subcarrier at the position of the target pilot frequency into a new pilot frequency if the position of the single-frequency interference is superposed with one of the plurality of pilot frequencies;
and the second extension unit is used for extending the data subcarrier at the position of the single-frequency interference into the virtual subcarrier only if the position of the single-frequency interference is superposed with the data subcarrier.
Optionally, the determining sub-module includes:
an obtaining unit, configured to obtain an extended virtual subcarrier number obtained by extending a subcarrier at a position where the single-frequency interference is located or an adjacent subcarrier to the virtual subcarrier in a manner of extending an outer virtual subcarrier;
a judging unit, configured to judge whether the number of the extended virtual subcarriers is less than a preset number of virtual subcarriers;
a first determining unit, configured to determine that, when the determination result is yes, the preset transmission rate is satisfied after the subcarrier at the position of the single-frequency interference or the adjacent subcarrier is extended to the virtual subcarrier by extending an outer virtual subcarrier;
and the second determining unit is used for determining that the preset transmission rate is not satisfied after the sub-carrier at the position of the single-frequency interference or the adjacent sub-carrier is expanded into the virtual sub-carrier in a mode of expanding the outer virtual sub-carrier under the condition that the judgment result is negative.
According to a further embodiment of the present invention, there is also provided a storage medium having a computer program stored therein, wherein the computer program is arranged to perform the steps of any of the above method embodiments when executed.
According to yet another embodiment of the present invention, there is also provided an electronic device, including a memory in which a computer program is stored and a processor configured to execute the computer program to perform the steps in any of the above method embodiments.
According to the invention, the position of the single-frequency interference of the OFDM symbol subcarrier is determined; the method comprises the steps of expanding a subcarrier or an adjacent subcarrier at the position of single-frequency interference in OFDM symbol subcarriers into a virtual subcarrier according to the position of the single-frequency interference, so that the problems of interference signal suppression through a frequency spectrum zero setting method, complex structure, high realization difficulty and high cost in the related technology can be solved, and the subcarrier at the position of the single-frequency interference or the adjacent position is set as the virtual subcarrier which is not influenced by the single-frequency interference due to the fact that the virtual subcarrier does not bear data, so that the method is low in cost and easy to realize.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a block diagram of a hardware structure of a mobile terminal of a single frequency interference processing method according to an embodiment of the present invention;
fig. 2 is a flow chart of a single frequency interference processing method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of OFDM subcarriers according to an embodiment of the present invention;
fig. 4 is a first schematic diagram illustrating single frequency interference of OFDM subcarriers according to an embodiment of the present invention;
FIG. 5 is a diagram II of single frequency interference of OFDM subcarriers according to an embodiment of the present invention;
fig. 6 is a diagram three illustrating single frequency interference of OFDM subcarriers according to an embodiment of the present invention;
FIG. 7 is a flow chart of a method for single frequency interference handling within OFDM sub-carriers according to an embodiment of the present invention;
fig. 8 is a block diagram of a single frequency interference processing apparatus according to an embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Example 1
The method provided by the first embodiment of the present application may be executed in a mobile terminal, a computer terminal, or a similar computing device. Taking a mobile terminal as an example, fig. 1 is a hardware structure block diagram of a mobile terminal of a single frequency interference processing method according to an embodiment of the present invention, as shown in fig. 1, the mobile terminal may include one or more processors 102 (only one is shown in fig. 1) (the processor 102 may include, but is not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA), and a memory 104 for storing data, and optionally, the mobile terminal may further include a transmission device 106 for a communication function and an input/output device 108. It will be understood by those skilled in the art that the structure shown in fig. 1 is only an illustration, and does not limit the structure of the mobile terminal. For example, the mobile terminal may also include more or fewer components than shown in FIG. 1, or have a different configuration than shown in FIG. 1.
The memory 104 may be used to store a computer program, for example, a software program and a module of an application software, such as a computer program corresponding to the single frequency interference processing method in the embodiment of the present invention, and the processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, so as to implement the method described above. The memory 104 may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory located remotely from the processor 102, which may be connected to the mobile terminal over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The transmission device 106 is used for receiving or transmitting data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a Network adapter (NIC), which can be connected to other Network devices through a base station so as to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is used for communicating with the internet in a wireless manner.
In this embodiment, a single frequency interference processing method operating in the mobile terminal or the network architecture is provided, and fig. 2 is a flowchart of the single frequency interference processing method according to the embodiment of the present invention, as shown in fig. 2, the flowchart includes the following steps:
step S202, determining the position of single-frequency interference of OFDM symbol subcarriers;
in an embodiment of the present invention, the step S202 may specifically include:
acquiring position signals of edge pilots of OFDM symbol subcarriers to obtain a first position sequence number and a second position signal, wherein the first position sequence number is smaller than the second position sequence number, the OFDM symbol subcarriers comprise virtual subcarriers at two sides and effective subcarriers in the middle, a plurality of pilots are inserted into the effective subcarriers, and the plurality of pilots comprise the edge pilots;
acquiring a target position serial number of the position of the single-frequency interference; if the target position serial number is smaller than the first position serial number or the target position serial number is larger than the second position serial number, determining that the single-frequency interference is on the outer side of the edge pilot frequency; and if the target position sequence number is greater than or equal to the first position sequence number and the target position sequence number is less than or equal to the second position sequence number, determining that the single-frequency interference is on the inner side of the edge pilot frequency.
Step S204, expanding the sub-carrier or the adjacent sub-carrier at the position of the single-frequency interference in the OFDM symbol sub-carriers into the virtual sub-carrier according to the position of the single-frequency interference.
Determining the position of single-frequency interference of the OFDM symbol subcarrier through the steps S202 to S204; the method comprises the steps of expanding a subcarrier or an adjacent subcarrier at the position of single-frequency interference in OFDM symbol subcarriers into a virtual subcarrier according to the position of the single-frequency interference, so that the problems of interference signal suppression through a frequency spectrum zero setting method, complex structure, high realization difficulty and high cost in the related technology can be solved, and the subcarrier at the position of the single-frequency interference or the adjacent position is set as the virtual subcarrier which is not influenced by the single-frequency interference due to the fact that the virtual subcarrier does not bear data, so that the method is low in cost and easy to realize.
In an embodiment of the present invention, the step S204 may specifically include:
if the single-frequency interference is on the outer side of the edge pilot frequency, expanding the sub-carrier or the adjacent sub-carrier at the position of the single-frequency interference into the virtual sub-carrier in a mode of expanding the outer virtual sub-carrier;
if the single-frequency interference is on the inner side of the edge pilot frequency, judging whether a preset transmission rate is met after a subcarrier or an adjacent subcarrier at the position of the single-frequency interference is expanded into the virtual subcarrier in a mode of expanding an outer virtual subcarrier;
if the judgment result is yes, expanding the sub-carrier or the adjacent sub-carrier at the position of the single-frequency interference into the virtual sub-carrier in a mode of expanding the outer virtual sub-carrier, and if the expanded virtual sub-carrier occupies the pilot frequency, reconfiguring the plurality of pilot frequencies in the expanded effective sub-carrier;
under the condition that the judgment result is negative, only the sub-carrier or the adjacent sub-carrier at the position of the single-frequency interference is expanded into the virtual sub-carrier, and further, if the position of the single-frequency interference is superposed with one of the plurality of pilot frequencies, only the data sub-carrier at the position of the single-frequency interference is expanded into the virtual sub-carrier, and the adjacent sub-carrier at the position of the target pilot frequency is expanded into a new pilot frequency; and if the position of the single-frequency interference is superposed with the data subcarrier, only expanding the data subcarrier at the position of the single-frequency interference into the virtual subcarrier.
Further, expanding the subcarrier at the position of the single-frequency interference or the adjacent subcarrier to the virtual subcarrier by expanding the outer virtual subcarrier may specifically include: and expanding the sub-carrier at the position of the single-frequency interference and the sub-carrier outside the position of the single-frequency interference into the virtual sub-carrier, or expanding the adjacent sub-carrier at the position of the single-frequency interference and the sub-carrier outside the position of the single-frequency interference into the virtual sub-carrier.
In the embodiment of the present invention, determining whether the subcarrier at the position of the single-frequency interference or the adjacent subcarrier after being extended to the virtual subcarrier by extending the outer virtual subcarrier meets the preset transmission rate may specifically include: acquiring the number of expanded virtual subcarriers for expanding the subcarriers or adjacent subcarriers at the positions of the single-frequency interference into the virtual subcarriers by expanding the outer virtual subcarriers; judging whether the number of the extended virtual subcarriers is less than the number of preset virtual subcarriers; if so, determining that the preset transmission rate is met after the sub-carrier or the adjacent sub-carrier at the position of the single-frequency interference is expanded into the virtual sub-carrier in a manner of expanding the outer virtual sub-carrier; and under the condition that the judgment result is negative, determining that the preset transmission rate is not satisfied after the subcarrier at the position of the single-frequency interference or the adjacent subcarrier is expanded into the virtual subcarrier in a mode of expanding the outer virtual subcarrier.
In the embodiment of the invention, pilot frequency is inserted into software, the single-frequency interference problem is solved in a mode of slightly sacrificing the transmission rate of a system, and orthogonal single-frequency interference and non-orthogonal single-frequency interference are solved by increasing the number of virtual subcarriers; when single-frequency interference occurs in the number of effective subcarriers, the interference problem is solved by configuring the position of the pilot frequency.
Fig. 3 is a schematic diagram of OFDM subcarriers according to an embodiment of the present invention, and as shown in fig. 3, it is assumed that the number of OFDM subcarriers is N, wherein virtual subcarriers are provided on two sides and effective subcarriers are provided in the middle. A plurality of pilot frequencies are inserted into the effective subcarriers and are randomly distributed among the effective subcarriers. Setting the initial virtual sub-carrier number as V and the two sides of the frequency band as V
Number of
And
the more the number of virtual subcarriers, which do not carry data, the lower the frequency band utilization and transmission rate, but which are not affected by single frequency interference.
Fig. 4 is a schematic diagram of single-frequency interference of OFDM subcarriers according to an embodiment of the present invention, as shown in fig. 4, if the single-frequency interference occurs outside the edge pilot (the outermost pilot), then the subcarriers near the single-frequency interference and the subcarriers outside the single-frequency interference may all be spread into virtual subcarriers to eliminate the influence of the single-frequency interference on the effective subcarriers, provided that after the virtual subcarriers are spread, the transmission rate of the system still meets the requirement.
Fig. 5 is a diagram two illustrating single-frequency interference of OFDM subcarriers according to an embodiment of the present invention, as shown in fig. 5, if the single-frequency interference occurs inside an edge pilot, and at this time, if the transmission rate of the system still meets the requirement after the outer virtual subcarriers are extended, after the outer virtual subcarriers are extended and the existing pilot positions are occupied, the positions of all pilots need to be reconfigured within a new effective subcarrier range.
Fig. 6 is a third schematic diagram of single-frequency interference of OFDM subcarriers according to an embodiment of the present invention, and as shown in fig. 6, if the single-frequency interference occurs in the range of effective subcarriers and cannot meet the requirement of transmission rate by means of extending virtual subcarriers, the position of the current pilot needs to be adjusted for resolution. If the single-frequency interference position coincides with the initial pilot frequency, the sub-carriers adjacent to the initial pilot frequency position are set as a new pilot frequency position, and the initial pilot frequency is not used for auxiliary demodulation of the receiver. If the single-frequency interference position is not coincident with the initial pilot frequency but is coincident with the data subcarrier, the data subcarrier of the single-frequency interference position is set as a virtual subcarrier which does not carry data.
When the transmission rate meets the system requirement, the maximum number of virtual subcarriers which can be newly increased is delta VMax. After feedback of the receiver, when single-frequency interference occurs in the signal frequency range and the signal frequency range is not in the current initial virtual subcarrier range, calculating the position serial number of the signal frequency range to be Fn. Fig. 7 is a flowchart of a single-frequency interference processing method in an OFDM subcarrier according to an embodiment of the present invention, and as shown in fig. 7, the processing for processing a single-frequency interference frequency point includes:
step S701, calculating the number of newly added virtual subcarriers;
step S702, determining whether the number of the newly added virtual sub-carriers is less than a preset threshold value Δ VMaxIf the judgment result is yes, executing step S703, otherwise executing step S706;
step S703, extending the sub-carrier or the adjacent sub-carrier where the single-frequency interference is located and the outer sub-carrier to be virtual sub-carriers, i.e. if the number of the newly added virtual sub-carriers is not greater than Δ VMaxThen single frequency interference position FnAnd all subcarriers outside thereof are set as virtual subcarriers. At this time, the number of newly added virtual subcarriers is:
step S704, judging whether the single-frequency interference is outside the edge pilot frequency, if not, executing step S705, otherwise, ending;
step S705, reconfiguring the pilot frequency;
let the initial edge pilot sequence number on both sides of the band be Pi0And Pi1On the basis of step S703, by formula Fn＜Pi0Or Fn＞Pi1And judging whether the single-frequency interference position is outside the edge pilot frequency. If the single-frequency interference position is outside the edge pilot frequency, the newly added virtual sub-carrier in step S703 occupies the position of the original data sub-carrier, and does not affect the pilot frequency, and no other processing is required. Otherwise, the virtual sub-carriers newly added in step S703 occupy the positions of some pilot carriers in addition to the positions of the original data sub-carriers. The pilot positions need to be adjusted. All pilot positions reconfigured should be inside the virtual sub-carriers.
Step S706, judging whether the single-frequency interference is superposed with the effective subcarrier, if not, executing step S707, otherwise, executing step S708;
step S707, setting a single frequency interference position subcarrier as a single virtual subcarrier;
step S708, setting a single-frequency interference position vector subcarrier to be a single virtual subcarrier;
step S709, judging whether the single frequency is occupied, if so, executing step S710, otherwise, ending;
step S710 sets the adjacent positions as pilots.
If the number of newly added virtual sub-carriers is greater than Δ VMaxThen processing cannot be performed by extending the virtual subcarriers on both sides. At this time, the sub-carrier at the single-frequency interference should be set to be a single virtual sub-carrier, i.e. the sub-carrier at the position no longer carries data or pilot, so as to avoid the receiver receiving the wrong data. If the pilot frequency is originally arranged in the position, after the pilot frequency is arranged into a single virtual sub-carrier, the pilot frequency is arranged into adjacent sub-carriersA pilot is placed at the wave. If the data subcarrier originally exists in the position, the data subcarrier is directly set to be a single virtual subcarrier.
It should be noted that if the single-frequency interference coincides with the effective sub-carrier, only one virtual sub-carrier needs to be set here. If the virtual subcarriers do not coincide with the effective subcarriers, two adjacent effective subcarriers need to be set as virtual subcarriers.
The embodiment of the invention expands the number of the virtual sub-carriers at two sides on the premise of allowing the reduction of the transmission rate, and can solve the problem of single-frequency interference without adjusting the pilot frequency position. The single-frequency interference position is set to be a single virtual subcarrier scheme, and the occupied pilot frequency position is adjusted, so that the problem of single-frequency interference can be solved on the basis of not reducing the transmission rate, and compared with a wave trap or a hardware application system, the single-frequency interference position is low in cost and easy to realize; under the condition of known frequency point interference, a configuration scheme with smaller loss of the frequency band utilization rate performance can be selected, and the simulation effect is good.
Example 2
According to another embodiment of the present invention, there is also provided a single frequency interference processing apparatus, and fig. 8 is a block diagram of the single frequency interference processing apparatus according to the embodiment of the present invention, as shown in fig. 8, including:
a determining module 82, configured to determine a position of a single-frequency interference of an OFDM symbol subcarrier;
an extending module 84, configured to extend the subcarrier or the adjacent subcarrier at the single-frequency interference location in the OFDM symbol subcarriers to the virtual subcarrier according to the single-frequency interference location.
Optionally, the determining module 82 includes:
a first obtaining sub-module, configured to obtain a position signal of an edge pilot of an OFDM symbol subcarrier to obtain a first position number and a second position signal, where the first position number is smaller than the second position number, the OFDM symbol subcarrier includes virtual subcarriers at two sides and an effective subcarrier in the middle, a plurality of pilots are inserted into the effective subcarrier, and the plurality of pilots include the edge pilot;
the second obtaining submodule is used for obtaining a target position serial number of the position where the single-frequency interference is located;
a first determining submodule, configured to determine that the single-frequency interference is on an outer side of the edge pilot if the target position sequence number is smaller than the first position sequence number or the target position sequence number is larger than the second position sequence number;
and the second determining submodule is used for determining that the single-frequency interference is positioned on the inner side of the edge pilot frequency if the target position sequence number is greater than or equal to the first position sequence number and the target position sequence number is less than or equal to the second position sequence number.
Optionally, the expansion module 84 includes:
the first expansion sub-module is used for expanding the sub-carrier or the adjacent sub-carrier at the position of the single-frequency interference into the virtual sub-carrier in a mode of expanding the outer virtual sub-carrier if the single-frequency interference is positioned at the outer side of the edge pilot frequency;
the judging submodule is used for judging whether the preset transmission rate is met after the subcarriers or adjacent subcarriers at the positions of the single-frequency interference are expanded into the virtual subcarriers in a mode of expanding outer virtual subcarriers if the single-frequency interference is positioned at the inner side of the edge pilot frequency;
a second extension sub-module, configured to, if the determination result is yes, extend the sub-carrier where the single-frequency interference is located or an adjacent sub-carrier to the virtual sub-carrier in a manner of extending an outer virtual sub-carrier, and if the extended virtual sub-carrier occupies a pilot frequency, reconfigure the plurality of pilot frequencies in the extended effective sub-carrier;
and the third expansion sub-module is used for expanding the sub-carrier or the adjacent sub-carrier at the position of the single-frequency interference into the virtual sub-carrier under the condition that the judgment result is negative.
Optionally, the first extension submodule or the second extension submodule is further used for
The sub-carrier at the position of the single-frequency interference and the sub-carriers outside the position of the single-frequency interference are expanded into the virtual sub-carrier, or
And expanding the adjacent subcarriers at the position of the single-frequency interference and the subcarriers outside the position of the single-frequency interference into the virtual subcarriers.
Optionally, the third expansion submodule includes:
the first extension unit is used for extending the data subcarrier at the position of the single-frequency interference into the virtual subcarrier only and extending the adjacent subcarrier at the position of the target pilot frequency into a new pilot frequency if the position of the single-frequency interference is superposed with one of the plurality of pilot frequencies;
and the second extension unit is used for extending the data subcarrier at the position of the single-frequency interference into the virtual subcarrier only if the position of the single-frequency interference is superposed with the data subcarrier.
Optionally, the determining sub-module includes:
an obtaining unit, configured to obtain an extended virtual subcarrier number obtained by extending a subcarrier at a position where the single-frequency interference is located or an adjacent subcarrier to the virtual subcarrier in a manner of extending an outer virtual subcarrier;
a judging unit, configured to judge whether the number of the extended virtual subcarriers is less than a preset number of virtual subcarriers;
a first determining unit, configured to determine that, when the determination result is yes, the preset transmission rate is satisfied after the subcarrier at the position of the single-frequency interference or the adjacent subcarrier is extended to the virtual subcarrier by extending an outer virtual subcarrier;
and the second determining unit is used for determining that the preset transmission rate is not satisfied after the sub-carrier at the position of the single-frequency interference or the adjacent sub-carrier is expanded into the virtual sub-carrier in a mode of expanding the outer virtual sub-carrier under the condition that the judgment result is negative.
It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.
Example 3
Embodiments of the present invention also provide a storage medium having a computer program stored therein, wherein the computer program is arranged to perform the steps of any of the above method embodiments when executed.
Alternatively, in the present embodiment, the storage medium may be configured to store a computer program for executing the steps of:
s1, determining the position of single-frequency interference of OFDM symbol sub-carriers;
s2, expanding the sub-carrier or the adjacent sub-carrier at the single-frequency interference position in the OFDM symbol sub-carrier into the virtual sub-carrier according to the single-frequency interference position.
Optionally, in this embodiment, the storage medium may include, but is not limited to: various media capable of storing computer programs, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.
Example 4
Embodiments of the present invention also provide an electronic device comprising a memory having a computer program stored therein and a processor arranged to run the computer program to perform the steps of any of the above method embodiments.
Optionally, the electronic apparatus may further include a transmission device and an input/output device, wherein the transmission device is connected to the processor, and the input/output device is connected to the processor.
Optionally, in this embodiment, the processor may be configured to execute the following steps by a computer program:
s1, determining the position of single-frequency interference of OFDM symbol sub-carriers;
s2, expanding the sub-carrier or the adjacent sub-carrier at the single-frequency interference position in the OFDM symbol sub-carrier into the virtual sub-carrier according to the single-frequency interference position.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A single frequency interference processing method, comprising:
determining the position of single-frequency interference of an Orthogonal Frequency Division Multiplexing (OFDM) symbol subcarrier;
and expanding the sub-carrier or the adjacent sub-carrier at the position of the single-frequency interference in the OFDM symbol sub-carriers into the virtual sub-carrier according to the position of the single-frequency interference.
2. The method of claim 1, wherein determining a single frequency interference location for the OFDM symbol subcarriers comprises:
acquiring position signals of edge pilots of OFDM symbol subcarriers to obtain a first position sequence number and a second position signal, wherein the first position sequence number is smaller than the second position sequence number, the OFDM symbol subcarriers comprise virtual subcarriers at two sides and effective subcarriers in the middle, a plurality of pilots are inserted into the effective subcarriers, and the plurality of pilots comprise the edge pilots;
acquiring a target position serial number of the position of the single-frequency interference;
if the target position serial number is smaller than the first position serial number or the target position serial number is larger than the second position serial number, determining that the single-frequency interference is on the outer side of the edge pilot frequency;
and if the target position sequence number is greater than or equal to the first position sequence number and the target position sequence number is less than or equal to the second position sequence number, determining that the single-frequency interference is on the inner side of the edge pilot frequency.
3. The method of claim 2, wherein extending the subcarriers or adjacent subcarriers at the single-frequency interference location to the virtual subcarriers according to the single-frequency interference location comprises:
if the single-frequency interference is on the outer side of the edge pilot frequency, expanding the sub-carrier or the adjacent sub-carrier at the position of the single-frequency interference into the virtual sub-carrier in a mode of expanding the outer virtual sub-carrier;
if the single-frequency interference is on the inner side of the edge pilot frequency, judging whether a preset transmission rate is met after a subcarrier or an adjacent subcarrier at the position of the single-frequency interference is expanded into the virtual subcarrier in a mode of expanding an outer virtual subcarrier;
if the judgment result is yes, expanding the sub-carrier or the adjacent sub-carrier at the position of the single-frequency interference into the virtual sub-carrier in a mode of expanding the outer virtual sub-carrier, and if the expanded virtual sub-carrier occupies the pilot frequency, reconfiguring the plurality of pilot frequencies in the expanded effective sub-carrier;
and under the condition that the judgment result is negative, only the sub-carrier or the adjacent sub-carrier at the position of the single-frequency interference is expanded into the virtual sub-carrier.
4. The method of claim 3, wherein extending the subcarriers or adjacent subcarriers where the single-frequency interference is located into the virtual subcarriers by extending outer virtual subcarriers comprises:
the sub-carrier at the position of the single-frequency interference and the sub-carriers outside the position of the single-frequency interference are expanded into the virtual sub-carrier, or
And expanding the adjacent subcarriers at the position of the single-frequency interference and the subcarriers outside the position of the single-frequency interference into the virtual subcarriers.
5. The method of claim 3, wherein extending only the sub-carriers or adjacent sub-carriers where the single-frequency interference is located as the virtual sub-carriers comprises:
if the position of the single-frequency interference is superposed with one of the plurality of pilot frequencies, only the data subcarrier of the position of the single-frequency interference is expanded into the virtual subcarrier, and the adjacent subcarrier of the position of the target pilot frequency is expanded into a new pilot frequency;
and if the position of the single-frequency interference is superposed with the data subcarrier, only expanding the data subcarrier at the position of the single-frequency interference into the virtual subcarrier.
6. The method according to any one of claims 3 to 5, wherein the determining whether the preset transmission rate is satisfied after the sub-carrier where the single-frequency interference is located or the adjacent sub-carrier is extended to the virtual sub-carrier by extending an outer virtual sub-carrier comprises:
acquiring the number of expanded virtual subcarriers for expanding the subcarriers or adjacent subcarriers at the positions of the single-frequency interference into the virtual subcarriers by expanding the outer virtual subcarriers;
judging whether the number of the extended virtual subcarriers is less than the number of preset virtual subcarriers;
if so, determining that the preset transmission rate is met after the sub-carrier or the adjacent sub-carrier at the position of the single-frequency interference is expanded into the virtual sub-carrier in a manner of expanding the outer virtual sub-carrier;
and under the condition that the judgment result is negative, determining that the preset transmission rate is not satisfied after the subcarrier at the position of the single-frequency interference or the adjacent subcarrier is expanded into the virtual subcarrier in a mode of expanding the outer virtual subcarrier.
7. A single frequency interference processing apparatus, comprising:
the determining module is used for determining the position of single-frequency interference of the OFDM symbol subcarrier;
and the extension module is used for extending the sub-carrier or the adjacent sub-carrier at the position of the single-frequency interference in the OFDM symbol sub-carriers into the virtual sub-carrier according to the position of the single-frequency interference.
8. The apparatus of claim 7, wherein the determining module comprises:
a first obtaining sub-module, configured to obtain a position signal of an edge pilot of an OFDM symbol subcarrier to obtain a first position number and a second position signal, where the first position number is smaller than the second position number, the OFDM symbol subcarrier includes virtual subcarriers at two sides and an effective subcarrier in the middle, a plurality of pilots are inserted into the effective subcarrier, and the plurality of pilots include the edge pilot;
the second obtaining submodule is used for obtaining a target position serial number of the position where the single-frequency interference is located;
a first determining submodule, configured to determine that the single-frequency interference is on an outer side of the edge pilot if the target position sequence number is smaller than the first position sequence number or the target position sequence number is larger than the second position sequence number;
and the second determining submodule is used for determining that the single-frequency interference is positioned on the inner side of the edge pilot frequency if the target position sequence number is greater than or equal to the first position sequence number and the target position sequence number is less than or equal to the second position sequence number.
9. A computer-readable storage medium, in which a computer program is stored, wherein the computer program is configured to carry out the method of any one of claims 1 to 6 when executed.
10. An electronic device comprising a memory and a processor, wherein the memory has stored therein a computer program, and wherein the processor is arranged to execute the computer program to perform the method of any of claims 1 to 6.
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