WO2016070307A1 - Processing method and apparatus for eliminating interference of adjacent bands in wireless system - Google Patents

Abstract

Provided are a processing method and apparatus for eliminating interference of adjacent bands in a wireless system. The method includes: receiving, by a node, an uplink pilot signal sent to the node by a second node via a second channel, and receiving an interference signal generated over the second channel by a downlink pilot signal sent to a first node by the node via a first channel; calculating to acquire, by the node, a frequency deviation between the uplink pilot signal and the interference signal, compensating a signal to be sent to the first node over the first channel according to the frequency deviation, and acquiring a compensated downlink signal; and sending, by the node, the compensated downlink signal to the first node via the first channel. The signal to be sent over the first channel is compensated via the frequency deviation acquired by the pilot signal, thereby reducing the interference between adjacent channels and improving the capacity of a communication system.

Description

Processing method and device for eliminating adjacent band interference in wireless system Technical field

The embodiments of the present invention relate to communication technologies, and in particular, to a method and apparatus for eliminating neighbor interference in a wireless system.

Background technique

Base station or access point in a wireless communication system such as a mobile cellular communication system, a wireless local area network (WLAN: WLAN), or a fixed wireless access (FWA). Communication nodes such as Access Point (AP), relay station (English: Relay Station, RS), and user equipment (English: User Equipment, UE for short) usually have the ability to transmit signals and receive signals from other communication nodes. The attenuation of the signal in the wireless channel is very large. Compared with the transmitting signal of the local transceiver node, the signal from the opposite communication node reaches the local transceiver node when the signal is very weak, which causes the transmitting and receiving nodes of the local transceiver node to receive the signal. The self-interference of the signal causes the received signal to be greatly disturbed.

In the prior art, in order to avoid self-interference of the transmitted signal of the local transceiver node to the received signal, the transmission and reception of the wireless signal are usually distinguished by different frequency bands or time segments. For example, in the Frequency Division Duplex (FDD) technology, the transmission signal and the reception signal are respectively communicated using different frequency bands separated by a certain guard band, and Time Division Duplex (TDD) technology is used. The transmitting signal and the receiving signal communicate using different time periods separated by a certain guard time interval to ensure sufficient isolation between the received signal and the transmitted signal. For example, in the WLAN system, the WIFI channel is taken as an example, and two independent frequency bands are divided, and each frequency band is divided into several channels. FIG. 1 is a schematic diagram of channel division in the 2.4 GHz frequency band in the WIFI. As shown in Figure 1, each channel occupies a bandwidth of 20 MHz, and there are a total of 14 channels. The directly adjacent two channels have serious interference with each other, and the selected channels are only separated by a sufficiently large distance to ensure that Normal operation, as shown in Figure 1, channels 1, 6, 11 do not interfere with each other. If two adjacent APs respectively allocate channels M and N, such as when M and N are selected to be 1 and 2, then there is serious interference between the two adjacent APs, such as the choice of M and N is 1 and At 6 o'clock, the interference between the two adjacent APs can be neglected, and both APs can work normally.

In summary, the interference between adjacent channels limits the flexibility of channel allocation and the utilization efficiency of the spectrum, and reduces the capacity of the communication system.

Summary of the invention

The method and device for eliminating neighbor interference in the wireless system provided by the embodiment of the present invention are used to solve the interference between adjacent channels in the prior art, which limits the flexibility of channel allocation and the utilization efficiency of the spectrum, and reduces the communication. The problem of the capacity of the system.

A first aspect of the present invention provides a method for eliminating neighbor interference in a wireless system, including:

The node receives the uplink pilot signal sent by the second node to the local node by using the second channel, and receives the interference generated by the downlink pilot signal sent by the local node to the first node by using the first channel on the second channel. signal;

The node calculates a frequency deviation between the uplink pilot signal and the interference signal, and performs compensation processing on a signal to be sent to the first node on the first channel according to the frequency deviation, and obtains compensation. The processed downlink signal;

The local node sends the downlink signal after the compensation processing to the first node by using the first channel.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the local node performs a compensation process on a signal that is to be sent to the first node on the first channel according to the frequency deviation, and acquires a compensation process. After the downlink signal, including:

The node adopts

Performing a compensation process on the signal to be sent to the first node on the first channel, and acquiring a downlink signal after the compensation process;

Where j denotes an imaginary unit, t denotes a transmission time, y(t) denotes a signal to be transmitted to the first node on the first channel, ΔF ₀ denotes the frequency deviation, and y'(t) denotes the compensation The processed downlink signal.

With reference to the first aspect and the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the local node receives an uplink that is sent by the second node to the local node by using the second channel. a frequency signal, and receiving an interference signal generated by the downlink pilot signal sent by the local node to the first node by using the first channel, on the second channel, including:

The local node receives the uplink pilot signal on all subcarriers of the first symbol;

The local node receives the interference signal on all subcarriers of the second symbol;

The local node receives the interference signal on a first subcarrier group of a third symbol, and receives the uplink pilot signal on a second group of subcarriers of the third symbol;

The first symbol, the second symbol, and the third symbol are three symbols in a time domain; the first subcarrier group and the second subcarrier group of the third symbol respectively comprise multiple consecutive Subcarriers.

With reference to the first aspect and the first possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the local node receives an uplink that is sent by the second node to the local node by using the second channel. a frequency signal, and receiving an interference signal generated by the downlink pilot signal sent by the local node to the first node by using the first channel, on the second channel, including:

The local node receives the interference signal on a first subcarrier group of a first symbol, and receives the uplink pilot signal on a second subcarrier group of the second symbol;

The local node receives the uplink pilot signal on a first subcarrier group of a second symbol, and receives the interference signal on a second subcarrier group of the second symbol;

The local node receives the interference signal on a first subcarrier group of a third symbol, and receives the uplink pilot signal on a second subcarrier group of the second symbol;

The first symbol, the second symbol, and the third symbol are three symbols in a time domain; the first subcarrier group and the second subcarrier group of the first symbol respectively comprise multiple consecutive The first subcarrier group and the second subcarrier group of the second symbol respectively comprise a plurality of consecutive subcarriers, and the first subcarrier group and the second subcarrier group of the third symbol respectively include multiple Continuous subcarriers.

With reference to the first aspect and the first possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the local node receives an uplink that is sent by the second node to the local node by using the second channel. a frequency signal, and receiving an interference signal generated by the downlink pilot signal sent by the local node to the first node by using the first channel, on the second channel, including:

The local node receives the uplink pilot signal on a subcarrier of each one or more subcarriers starting from a first subcarrier of the first symbol, and starting from a second subcarrier of the first symbol Receiving the interference signal on each subcarrier separated by one or more subcarriers;

The local node receives the interference signal on subcarriers of each one or more subcarriers starting from a first subcarrier of the second symbol, and each interval starting from a second subcarrier of the second symbol Receiving the uplink pilot signal on subcarriers of one or more subcarriers;

The local node receives the uplink pilot signal on a subcarrier of each one or more subcarriers starting from a first subcarrier of the third symbol, and starts from a second subcarrier of the third symbol Receiving the interference signal on each subcarrier separated by one or more subcarriers;

The first symbol, the second symbol, and the third symbol are three symbols in a time domain; the first subcarrier and the second subcarrier of the first symbol are different sub-carriers in the frequency domain. The first subcarrier and the second subcarrier of the second symbol are different subcarriers in the frequency domain, and the first subcarrier and the second subcarrier of the third symbol are different subcarriers in the frequency domain.

With reference to the first aspect, and any one of the second, third, and fourth possible embodiments of the first aspect, in a fifth possible implementation manner of the first aspect, the Describe the frequency deviation between the uplink pilot signal and the interference signal, including:

The local node calculates and acquires a plurality of first uplink pilot frequencies according to an uplink pilot signal on a subcarrier of the first symbol and an uplink pilot signal on a subcarrier of the third symbol having the same frequency Deviating, and averaging the plurality of first uplink pilot frequency offsets to obtain an uplink pilot frequency offset;

The local node calculates, according to the interference signal on the subcarrier of the second symbol and the interference signal on the subcarrier of the third symbol with the same frequency, the frequency deviation of the plurality of first interference signals, and Determining a plurality of first interference signal frequency deviations to obtain an interference signal frequency deviation;

The local node calculates a difference between the interference signal frequency deviation and the uplink pilot frequency deviation to obtain the frequency deviation.

A second aspect of the present invention provides a processing apparatus for eliminating neighbor interference in a wireless system, including:

a receiving module, configured to receive an uplink pilot signal sent by the second node to the processing device by using the second channel, and receive a downlink pilot signal sent by the local node to the first node by using the first channel in the second Interference signals generated on the channel;

a processing module, configured to calculate a frequency deviation between the uplink pilot signal and the interference signal, and perform compensation processing on the signal to be sent to the first node on the first channel according to the frequency deviation, and obtain Compensating the processed downlink signal;

And a sending module, configured to send the downlink signal that is processed by the compensation to the first node by using the first channel.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the processing module is specifically configured to:

use

Performing a compensation process on the signal to be sent to the first node on the first channel, and acquiring a downlink signal after the compensation process;

Where j denotes an imaginary unit, t denotes a transmission time, y(t) denotes a signal to be transmitted to the first node on the first channel, ΔF ₀ denotes the frequency deviation, and y'(t) denotes the compensation The processed downlink signal.

With reference to the second aspect and the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the receiving module is specifically configured to:

Receiving the uplink pilot signal on all subcarriers of the first symbol;

Receiving the interference signal on all subcarriers of the second symbol;

Receiving the interference signal on a first subcarrier group of a third symbol, and receiving the uplink pilot signal on a second group of subcarriers of the third symbol;

The first symbol, the second symbol, and the third symbol are three symbols in a time domain; the first subcarrier group and the second subcarrier group of the third symbol respectively comprise multiple consecutive Subcarriers.

With reference to the second aspect and the first possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the receiving module is specifically configured to:

Receiving the interference signal on a first subcarrier group of the first symbol, and receiving the uplink pilot signal on a second subcarrier group of the second symbol;

Receiving the uplink pilot signal on a first subcarrier group of a second symbol, and receiving the interference signal on a second subcarrier group of the second symbol;

Receiving the interference signal on a first subcarrier group of a third symbol, and receiving the uplink pilot signal on a second subcarrier group of the second symbol;

The first symbol, the second symbol, and the third symbol are three symbols in a time domain; the first subcarrier group and the second subcarrier group of the first symbol respectively comprise multiple consecutive The first subcarrier group and the second subcarrier group of the second symbol respectively comprise a plurality of consecutive subcarriers, and the first subcarrier group and the second subcarrier group of the third symbol respectively include multiple Continuous subcarriers.

With reference to the second aspect and the first possible implementation manner of the second aspect, in a fourth possible implementation manner of the second aspect, the receiving module is specifically configured to:

Receiving on subcarriers per one carrier separated from the first subcarrier of the first symbol And the uplink pilot signal, and receiving the interference signal on a subcarrier that is separated by one carrier from a second subcarrier of the first symbol;

Receiving the interference signal on subcarriers per one carrier separated from the first subcarrier of the second symbol, and receiving on subcarriers per one carrier separated from the second subcarrier of the second symbol The uplink pilot signal;

Receiving the uplink pilot signal on a subcarrier that is separated by one carrier from the first subcarrier of the third symbol, and subcarriers per one carrier from the second subcarrier of the third symbol Receiving the interference signal thereon;

The first symbol, the second symbol, and the third symbol are three symbols in a time domain; the first subcarrier and the second subcarrier of the first symbol are different sub-carriers in the frequency domain. The first subcarrier and the second subcarrier of the second symbol are different subcarriers in the frequency domain, and the first subcarrier and the second subcarrier of the third symbol are different subcarriers in the frequency domain.

With reference to the second aspect, and any one of the second, third, and fourth possible embodiments of the second aspect, in a fifth possible implementation of the second aspect, the processing module is further configured to: :

Calculating and acquiring a plurality of first uplink pilot frequency offsets according to an uplink pilot signal on a subcarrier of the first symbol and an uplink pilot signal on a subcarrier of the third symbol having the same frequency, and Having averaged the plurality of first uplink pilot frequency offsets to obtain an uplink pilot frequency offset;

Acquiring and acquiring the plurality of first interference signal frequency offsets according to the interference signal on the subcarrier of the second symbol and the interference signal on the subcarrier of the third symbol having the same frequency, and calculating the plurality of first interference signal frequency deviations An interference signal frequency deviation is averaged to obtain an interference signal frequency deviation;

Calculating a difference between the interference signal frequency deviation and the uplink pilot frequency deviation to obtain the frequency deviation.

The method and device for canceling the adjacent band interference provided by the embodiment of the present invention receive the uplink pilot signal sent by the second node on the second channel, and the downlink pilot signal sent by the first node to the first channel. The interference signal on the two channels is calculated, the frequency deviation of the interference signal and the uplink pilot signal sum is calculated, and the signal to be transmitted on the first channel is compensated according to the frequency deviation, and the downlink signal after the compensation processing is obtained and sent The first node is caused to have a small frequency deviation between the downlink signal and the uplink signal on the second channel, which effectively reduces interference between adjacent channels and improves the capacity of the communication system.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

FIG. 1 is a schematic diagram of channel division of a 2.4 GHz frequency band in WIFI;

2 is a flowchart of Embodiment 1 of a method for eliminating neighbor interference;

3a is a schematic diagram of a pilot scheme of Embodiment 2 of a method for eliminating neighbor interference in the present invention;

3b is a flowchart of Embodiment 2 of a method for eliminating neighbor interference in the present invention;

4a is a schematic diagram of a pilot scheme of Embodiment 3 of a method for eliminating neighbor interference in the present invention;

4b is a flowchart of Embodiment 3 of a method for eliminating neighbor interference in the present invention;

FIG. 5 is a schematic diagram of a pilot scheme of Embodiment 4 of a method for eliminating neighbor interference according to the present invention; FIG.

FIG. 5b is a flowchart of Embodiment 4 of a method for eliminating neighbor interference;

Figure 6a is a schematic diagram of a time domain signal x(t) of a signal of a kth subcarrier;

Figure 6b is a schematic diagram of the frequency response y(f) of the signal of the kth subcarrier;

7 is a schematic diagram of interference analysis of a frequency domain response of a subcarrier on adjacent subcarriers;

8 is a schematic diagram of an 802.11b-based spectral response and its analysis of adjacent channel interference;

9 is a schematic diagram of interference of a transmitted signal in a receiving channel;

10a is a schematic diagram of the node side transmitting signal and the receiving signal completely synchronized;

FIG. 10b is a schematic diagram of the node side transmitting signal and the receiving signal not completely synchronized;

FIG. 11 is a schematic diagram showing the relationship between the interference power of the transmitted signal and the frequency deviation of the received signal when the transmitting signal and the received signal of the node are not completely synchronized;

12 is a schematic structural diagram of Embodiment 1 of a processing apparatus for eliminating neighbor interference in a wireless system according to the present invention;

FIG. 13 is a schematic structural diagram of Embodiment 1 of a processing device for eliminating neighbor interference in a wireless system according to the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is apparent that the described embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The method for eliminating neighbor interference provided by the embodiment of the present invention is applicable to all communication systems using Orthogonal Frequency Division Multiplexing (OFDM) for transmission, for example, Long Term Evolution (English: Long Term) Evolution, referred to as LTE) system, wireless LAN system, and Worldwide Interoperability for Microwave Access (WiMAX) system.

2 is a flowchart of Embodiment 1 of a method for eliminating neighbor interference, and as shown in FIG. 2, the specific steps of the method for eliminating neighbor interference in the wireless system are as follows:

S101: The local node receives an uplink pilot signal sent by the second node to the local node by using the second channel, and receives a downlink pilot signal that is sent by the local node to the first node by using the first channel, and generates the downlink pilot signal on the second channel. Interference signal.

In this embodiment, the node can use two channels to communicate with two nodes at the same time. The node receives the uplink pilot channel sent by the second node through the second channel, and sends the downlink guide to the first node by using the first channel. a frequency signal, the first channel and the second channel may be adjacent channels, or may be non-adjacent channels, the first channel and the second channel are channels that interfere with each other, and the downlink pilots on the first channel The signal will generate a certain interference signal on the first channel.

The node needs to receive the interference signal when receiving the uplink pilot signal.

S102: The local node calculates a frequency offset between the uplink pilot signal and the interference signal, and performs compensation processing on a signal to be sent to the first node on the first channel according to the frequency deviation. Obtain the downlink signal after the compensation process.

In this embodiment, if the frequency between the uplink pilot signal and the interference signal is completely synchronized, although there is a certain interference, the interference power on the designated subcarrier is 0, which is substantially not Affecting the uplink signal, it is therefore necessary to compensate for the signal to be transmitted to the first node on the first channel, the compensation process being dependent on the frequency offset between the uplink pilot signal and the interference signal.

After the frequency deviation is acquired, all signals to be transmitted to the first node on the first channel are subjected to compensation processing according to the frequency deviation.

Specifically, the node is adopted by the node.

The signal to be transmitted to the first node on the first channel (the signal to be transmitted after the pilot signal is compensated) is compensated to obtain a downlink signal after the compensation process. Where j denotes an imaginary unit, t denotes a transmission time, y(t) denotes a signal to be transmitted to the first node on the first channel, and ΔF ₀ denotes the frequency deviation, that is, the first channel is upwardly The frequency deviation between the signal transmitted by one node and the signal sent by the second node, y'(t) represents the downlink signal after the compensation process.

S103: The local node sends the downlink signal that is processed by the compensation to the first node by using the first channel.

In this embodiment, the downlink signal obtained after performing compensation processing on all the signals to be sent to the first node on the first channel is sent to the first node, so that the downlink signal is on the second channel. The resulting interfering signal is fully synchronized with the upstream signal received on the second channel.

The processing method for canceling the neighboring band interference provided by the embodiment, by receiving the uplink pilot signal sent by the second node on the second channel, and the downlink pilot signal sent by the first node to the first channel on the second channel Interference signal, calculating a frequency deviation of the interference signal and the uplink pilot signal sum, and compensating for a signal to be transmitted on the first channel according to the frequency deviation, acquiring a downlink signal after the compensation processing, and transmitting the downlink signal to the first The node is such that the frequency deviation between the downlink signal and the uplink signal on the second channel is sufficiently small, effectively reducing interference between adjacent channels, and improving the capacity of the communication system.

FIG. 3 is a schematic diagram of a pilot scheme of a second embodiment of a method for canceling adjacent interference according to the present invention; FIG. 3b is a flowchart of a second embodiment of a method for canceling adjacent interference according to the present invention; The invention discloses a method for eliminating neighbor interference. The specific steps of an implementation manner are as follows:

S201: The local node receives the uplink pilot signal on all subcarriers of the first symbol; the local node receives the interference signal on all subcarriers of the second symbol; the local node is in the third symbol Receiving the interference signal on a first subcarrier group and receiving the uplink pilot signal on a second group of subcarriers of the third symbol.

In this embodiment, as shown in FIG. 3a, the first symbol, the second symbol, and the third symbol are three symbols that are directly adjacent or not directly adjacent in the time domain; The first subcarrier group and the second subcarrier group of the symbol respectively comprise a plurality of consecutive subcarriers. That is, the first symbol, the second symbol and the third symbol may be three consecutive symbols such as 1, 2, 3 or three symbols that are discontinuous, such as 1, 3, 5, and the same function may be implemented.

The pilot scheme for receiving the uplink pilot signal and the interference signal at the local node is designed to receive all uplink pilot signals on all subcarriers of the first symbol, and the number of subcarriers of the first symbol More than or equal to two, all receiving interference signals on all subcarriers of the second symbol, the number of subcarriers of the second symbol is greater than or equal to two, and the first subcarrier of the third subcarrier is the first subcarrier The group receives the interference signal and receives the uplink pilot signal in the second subcarrier of the third subcarrier, that is, the second subcarrier group.

Optionally, the uplink pilot signal may be received in the first subcarrier of the third subcarrier, that is, in the first subcarrier group, and the interference is received in the second subcarrier of the third subcarrier, that is, the second subcarrier group. signal.

Optionally, the node receives the uplink pilot signal on all subcarriers of the second symbol, and the local node receives the interference signal on all subcarriers of the first symbol. That is, the first symbol and the second symbol exchange position effect are also the same.

The specific implementation manner is the same as the above implementation principle.

S202: The local node calculates and acquires multiple first uplinks according to an uplink pilot signal on a subcarrier of the first symbol and an uplink pilot signal on a subcarrier of the third symbol with the same frequency. Frequency frequency deviation, and averaging the plurality of first uplink pilot frequency offsets to obtain an uplink pilot frequency offset.

In this embodiment, the process of obtaining the frequency offset is described in detail according to the pilot scheme shown in FIG. 3b:

Take the scheme shown in Figure 3a as an example to show how to estimate the frequency difference between the uplink and downlink signals:

Suppose y _{1 (1,} k ₁₎ is the signal at the k-th symbol of _a first subcarrier frequency uplink _{pilot; y 2 (2, k 2} ) as the interference signal in the second symbol of subcarrier k ₂ signal; a first uplink pilot signal is assumed that uplink pilot frequency deviation ΔF ₁ ', the third symbol, the first subcarrier k ₁ receiving the uplink pilot signal is:

Then the ΔF ₁ ' can be estimated as follows:

Wherein, ()' represents the conjugate, T' is the duration of the guard interval for each OFDM symbol, and N is the number of OFDM symbols between the third symbol and the first symbol.

After all the uplink pilot signals of the second subcarrier group of the first symbol and the third symbol are obtained according to the above method, the first uplink pilot frequency deviation ΔF ₁ ′ is obtained by the above method, and all the first uplink signals are obtained. The frequency frequency deviation is further averaged to obtain an uplink pilot frequency deviation ΔF ₁ that improves the estimation accuracy.

S203: The local node calculates, according to the interference signal on the subcarrier of the second symbol and the interference signal on the subcarrier of the third symbol with the same frequency, the frequency deviation of the plurality of first interference signals, and A frequency deviation of the plurality of first interference signals is averaged to obtain an interference signal frequency deviation.

In the present embodiment, on the basis of S202, setting a first interfering signal frequency offset signal corresponding to the interference on each subcarrier ΔF ₂ ', then the first k ₂ th subcarrier in the third symbol of the received interference signal:

Then the ΔF ₂ ' can be estimated as follows:

Where ()' represents the conjugate, T' is the duration of the guard interval for each OFDM symbol, and M is the number of OFDM symbols between the third symbol and the first symbol.

After all the interference signals of the first subcarrier group of the first symbol and the third symbol are obtained according to the above method, the plurality of first interference signal frequency deviations ΔF ₂ ′ are obtained by the above method, and all the first interference signal frequency deviations are further The averaging results in an interference signal frequency deviation ΔF ₂ that improves the estimation accuracy.

S204: The local node calculates a difference between the interference signal frequency deviation and the uplink pilot frequency deviation, to obtain the frequency deviation.

In this embodiment, the frequency offset ΔF ₁ of the interference signal obtained by subtracting the uplink frequency offset ΔF _{1 is} obtained, and the frequency deviation ΔF ₀ between the uplink pilot signal and the interference signal is obtained, that is,

ΔF ₀ = ΔF _{2 -} ΔF ₁ .

S205: The node is used by the node

Performing a compensation process on the signal to be transmitted to the first node on the first channel, and acquiring a downlink signal after the compensation process.

In the present embodiment, j represents an imaginary unit, t represents a transmission time, y(t) represents a signal to be transmitted to the first node on the first channel, and ΔF ₀ represents the frequency deviation, y'(t) The downlink signal after the compensation process is indicated.

S206: The local node sends the downlink signal that is processed by the compensation to the first node by using the first channel.

In this embodiment, the slave node after the compensation process is sent to the first node on the first channel. The interference signal of the downlink signal on the second channel is completely synchronized with the uplink signal on the second channel, that is, the interference between them is sufficiently small.

The method for canceling the adjacent band interference provided by the embodiment, by receiving the uplink pilot signal sent by the second node in the first symbol of the second channel, and the downlink pilot signal sent to the first node in the first channel An interference signal on a second symbol of the second channel, and receiving the interference signal on a first half of the third symbol of the second channel, and receiving an uplink pilot signal on the second half of the subcarrier, calculating the first symbol and the first symbol a frequency deviation of the uplink pilot signal on the subcarrier corresponding to the three symbols, and calculating a frequency offset of the interference signal on the subcarrier corresponding to the second symbol and the third symbol, and calculating the obtained uplink pilot signal and the interference signal Frequency deviation, and compensating for the signal to be transmitted on the first channel according to the frequency deviation, acquiring the compensated downlink signal, and transmitting the downlink signal to the first node, so that the downlink signal and the uplink signal on the second channel are between The frequency deviation is small enough to effectively reduce the interference between adjacent channels and improve the capacity of the communication system.

4a is a schematic diagram of a pilot scheme of a third embodiment of a method for canceling adjacent interference according to the present invention; FIG. 4b is a flowchart of a third embodiment of a method for canceling adjacent interference according to the present invention; The specific steps of another implementation manner of the invention for eliminating neighbor interference are:

S301: The local node receives the interference signal on a first subcarrier group of a first symbol, and receives the uplink pilot signal on a second subcarrier group of the second symbol; Receiving, by the first subcarrier group of the second symbol, the uplink pilot signal, and receiving the interference signal on a second subcarrier group of the second symbol; the local node is in a first sub The interference signal is received on a carrier group, and the uplink pilot signal is received on a second subcarrier group of the second symbol.

In this embodiment, the first symbol, the second symbol, and the third symbol are three symbols in a time domain; respectively, the first subcarrier group and the second subcarrier group of the first symbol are respectively The method includes a plurality of consecutive subcarriers, where the first subcarrier group and the second subcarrier group of the second symbol respectively comprise a plurality of consecutive subcarriers, and the first subcarrier group and the second subcarrier of the third symbol The group includes a plurality of consecutive subcarriers, respectively.

The first symbol, the second symbol, and the third symbol may be continuous or discontinuous in the time domain.

As shown in FIG. 4a, the pilot scheme for receiving the uplink pilot signal and the interference signal at the local node is designed to receive all the carriers on all the subcarriers in the first subcarrier group of the first half of the first symbol. a scrambling signal, all receiving uplink pilot signals on all subcarriers in the second subcarrier group of the second half of the first symbol, the number of subcarriers of the first symbol being greater than or equal to two, in the first half of the second symbol All of the subcarriers in the first subcarrier group receive all uplink pilot signals, and all the subcarriers in the second subcarrier group of the second half of the second symbol receive interference signals, and the subcarriers of the second symbol The number of the first subcarrier group and the second subcarrier group of the third symbol may be the same as the first symbol or the second symbol. The specific invention is not limited.

Optionally, all uplink pilot signals are received on all subcarriers in the first subcarrier group of the first half of the first symbol, on all subcarriers in the second subcarrier group of the second half of the first symbol. All of the interference signals are received, and the second symbol and the third symbol are analogized in the above manner, and can be set according to actual conditions, which is not limited in this application.

S302: The local node calculates and obtains multiple first uplinks according to the uplink pilot signal on the subcarrier of the first symbol and the uplink pilot signal on the subcarrier of the third symbol with the same frequency. Frequency frequency deviation, and averaging the plurality of first uplink pilot frequency offsets to obtain an uplink pilot frequency offset.

In this embodiment, in the same manner as S202 in the embodiment shown in FIG. 3b, all uplink pilot signals of the second subcarrier group of the first symbol and the second subcarrier group of the third symbol are in the same manner. After the plurality of first uplink pilot frequency offsets ΔF ₁ ' are obtained, all of the first uplink pilot frequency offsets are further averaged to obtain an uplink pilot frequency offset ΔF ₁ with improved estimation accuracy.

S303: The local node calculates, according to the interference signal on the subcarrier of the second symbol and the interference signal on the subcarrier of the third symbol with the same frequency, the frequency deviation of the multiple first interference signals, and A frequency deviation of the plurality of first interference signals is averaged to obtain an interference signal frequency deviation.

In this embodiment, all the interference signals of the first subcarrier group of the first symbol and the first subcarrier group of the third symbol are obtained by the above method in the same manner as S203 in the embodiment shown in FIG. 3b. After the plurality of first interference signal frequency deviations ΔF ₂ ′, all the first interference signal frequency deviations are further averaged to obtain an interference signal frequency deviation ΔF ₂ with improved estimation accuracy.

S304: The local node calculates a difference between the interference signal frequency deviation and the uplink pilot frequency deviation, to obtain the frequency deviation.

In this embodiment, the frequency offset ΔF ₁ of the interference signal obtained by subtracting the uplink frequency offset ΔF _{1 is} obtained, and the frequency deviation ΔF ₀ between the uplink pilot signal and the interference signal is obtained, that is,

ΔF ₀ = ΔF _{2 -} ΔF ₁ .

S305: The node is used by the node

Performing a compensation process on the signal to be transmitted to the first node on the first channel, and acquiring a downlink signal after the compensation process.

In the present embodiment, j represents an imaginary unit, t represents a transmission time, y(t) represents a signal to be transmitted to the first node on the first channel, and ΔF ₀ represents the frequency deviation, y'(t) The downlink signal after the compensation process is indicated.

S306: The local node sends the downlink signal that is processed by the compensation to the first node by using the first channel.

In this embodiment, the interference signal of the downlink signal transmitted from the local node to the first node on the first channel after the compensation process is completely synchronized with the uplink signal on the second channel, that is, between Small enough to be close to zero.

The method for canceling the adjacent band interference provided in this embodiment receives the first symbol of the second symbol by receiving the interference signal of the first subcarrier group of the first symbol and the uplink pilot signal of the second subcarrier group of the first symbol. An uplink pilot signal on the subcarrier group and an interference signal on the second subcarrier group of the second symbol, and receiving the interference signal on the first subcarrier group of the third symbol, the second subcarrier in the third symbol Receiving, by the group, the uplink pilot signal, calculating a frequency offset of the uplink pilot signal on the subcarrier corresponding to the first symbol and the third symbol, and calculating an interference signal on the subcarrier corresponding to the second symbol and the third symbol Frequency deviation, and calculating a frequency deviation of the uplink pilot signal and the interference signal, and compensating for a signal to be transmitted on the first channel according to the frequency deviation, acquiring a downlink signal after the compensation processing, and transmitting the downlink signal to the first node Therefore, the frequency deviation between the downlink signal and the uplink signal on the second channel is sufficiently small, effectively reducing interference between adjacent channels, and improving the capacity of the communication system. , Greatly improving the utilization of the channel.

FIG. 5 is a schematic diagram of a pilot scheme of a third embodiment of a method for canceling adjacent interference according to the present invention; FIG. 5b is a flowchart of a third embodiment of a method for canceling adjacent interference according to the present invention; The specific steps of another implementation manner of the invention for eliminating neighbor interference are:

S401: The local node receives the uplink pilot signal on a subcarrier that is separated by one or more subcarriers starting from a first subcarrier of the first symbol, and is in a second subcarrier from the first symbol. Receiving the interference signal on each of the first subcarriers separated by one or more subcarriers; the local node receiving the subcarriers of each of the one or more subcarriers starting from the first subcarrier of the second symbol Interfering with the signal and each one or more intervals from the second subcarrier of the second symbol Receiving the uplink pilot signal on subcarriers of subcarriers; the local node receiving the uplink pilot signal on subcarriers per one or more subcarriers starting from a first subcarrier of the third symbol And receiving the interference signal on subcarriers of each of the one or more subcarriers starting from the second subcarrier of the third symbol.

In this embodiment, the first symbol, the second symbol, and the third symbol are three symbols in a time domain; the first subcarrier and the second subcarrier of the first symbol are frequency domains. The first subcarrier and the second subcarrier of the second symbol are different subcarriers in the frequency domain, and the first subcarrier and the second subcarrier of the third symbol are different in the frequency domain. Subcarriers.

Optionally, the first subcarrier and the second subcarrier are not necessarily limited to adjacent subcarriers, and may be one or more subcarriers. The invention is not limited thereto.

That is, there are at least two options: the first subcarrier group is 1, 3, 5, 7, 9, 11, 13 (where 1 represents the first subcarrier, 3 represents the third subcarrier, and so on), The two subcarriers are 2, 4, 6, 8, 10, 12, 14 (where 2 represents the second subcarrier, 4 represents the fourth subcarrier, and so on); the first subcarrier is 1, 5, 9 13, the second sub-group is 2, 6, 10, 14, or other conditions that satisfy the law.

The pilot scheme for receiving the uplink pilot signal and the interference signal at the local node is designed as follows: the node receives the same signal on each subcarrier on the first symbol of the second channel, as shown in FIG. 5a. Indicates that the interference signal is received on the first subcarrier, the uplink pilot signal is received on the second subcarrier, and so on, the signals on the adjacent two subcarriers are different, and one subcarrier is separated on the second subcarrier. The subcarriers receive the same signal, the adjacent subcarriers receive different signals, and the subcarriers corresponding to the first symbol receive different signals, that is, receive the uplink pilot signals on the first subcarrier of the second symbol, The interference signal is received on the second subcarrier of the second symbol, and so on.

Different signals are also received on the adjacent subcarriers of the third symbol, which may be the same as the first symbol or the second symbol, and may be set according to actual conditions, which is not limited in this application.

S402: The local node calculates and obtains multiple first uplinks according to the uplink pilot signal on the subcarrier of the first symbol and the uplink pilot signal on the subcarrier of the third symbol with the same frequency. Frequency frequency deviation, and averaging the plurality of first uplink pilot frequency offsets to obtain an uplink pilot frequency offset.

In this embodiment, in the same manner as S202 in the embodiment shown in FIG. 3b, all uplink pilot signals of the second subcarrier group of the first symbol and the second subcarrier group of the third symbol are in the same manner. After the plurality of first uplink pilot frequency offsets ΔF ₁ ' are obtained, all of the first uplink pilot frequency offsets are further averaged to obtain an uplink pilot frequency offset ΔF ₁ with improved estimation accuracy.

S403: The local node calculates, according to the interference signal on the subcarrier of the second symbol and the interference signal on the subcarrier of the third symbol with the same frequency, the frequency deviation of the multiple first interference signals, and A frequency deviation of the plurality of first interference signals is averaged to obtain an interference signal frequency deviation.

In this embodiment, all the interference signals of the first subcarrier group of the first symbol and the first subcarrier group of the third symbol are obtained by the above method in the same manner as S203 in the embodiment shown in FIG. 3b. After the plurality of first interference signal frequency deviations ΔF ₂ ′, all the first interference signal frequency deviations are further averaged to obtain an interference signal frequency deviation ΔF ₂ with improved estimation accuracy.

S404: The local node calculates a difference between the interference signal frequency deviation and the uplink pilot frequency deviation, to obtain the frequency deviation.

In this embodiment, the frequency offset ΔF ₁ of the interference signal obtained by subtracting the uplink frequency offset ΔF _{1 is} obtained, and the frequency deviation ΔF ₀ between the uplink pilot signal and the interference signal is obtained, that is,

ΔF ₀ = ΔF _{2 -} ΔF ₁ .

S405: The node is used by the node.

Performing a compensation process on the signal to be transmitted to the first node on the first channel, and acquiring a downlink signal after the compensation process.

In the present embodiment, j represents an imaginary unit, t represents a transmission time, y(t) represents a signal to be transmitted to the first node on the first channel, and ΔF ₀ represents the frequency deviation, y'(t) The downlink signal after the compensation process is indicated.

S406: The local node sends the downlink signal that is processed by the compensation to the first node by using the first channel.

In this embodiment, the interference signal of the downlink signal transmitted from the local node to the first node on the first channel after the compensation process is completely synchronized with the uplink signal on the second channel, that is, between Small enough to be close to zero.

The method for canceling the adjacent band interference provided in this embodiment receives the interference signal on the first subcarrier of the first symbol, and receives the uplink pilot signal on the second subcarrier, that is, the signal on the adjacent two subcarriers. Differentiating, receiving different signals on adjacent subcarriers of the second symbol, and receiving different signals on the subcarriers corresponding to the first symbol, that is, connecting on the first subcarrier of the second symbol Receiving an uplink pilot signal, receiving an interference signal on a second subcarrier of the second symbol, and receiving a different signal on an adjacent subcarrier of the third symbol, which may be the same as the first symbol or the second symbol, and is calculated and obtained. Frequency deviation of the uplink pilot signal on the subcarrier corresponding to the third symbol, and calculating a frequency offset of the interference signal on the subcarrier corresponding to the second symbol and the third symbol, and calculating and acquiring the uplink pilot signal Deviating from the frequency of the interference signal, and compensating for the signal to be transmitted on the first channel according to the frequency deviation, acquiring the compensated downlink signal, and transmitting the downlink signal to the first node, so that the downlink signal and the second channel are The frequency deviation between the uplink signals is small enough to effectively reduce the interference between adjacent channels, improve the capacity of the communication system, and greatly improve the channel utilization rate.

In the above embodiments shown in FIG. 2 to FIG. 5b, the principle based on the processing method for eliminating neighbor interference in the present invention is described in detail below:

Today's communication systems, such as WiFi systems or LTE systems, are transmitted using OFDM. According to the basic principle of OFDM, it can be known that for the symbol s _k transmitted on the kth subcarrier, the frequency domain response can be expressed as:

Where: ΔF is the subcarrier spacing;

Is the length of one OFDM symbol; y(f) is the time domain signal; x(t)=exp(j2πkΔFt), and 0≤t≤T is the frequency domain response.

6a is a schematic diagram of a time domain signal x(t) of a signal of a kth subcarrier, and FIG. 6b is a schematic diagram of a frequency response y(f) of a signal of a kth subcarrier, as shown in the figure, wherein the left diagram is x ( t) The real and imaginary signals, the upper part is the response map for the whole frequency, the lower part is the signal that is partially amplified, the right side is the amplitude response of y(f), the same upper part is the response map for the whole frequency, the lower part A graph that is partially magnified for the signal. The signals in Figures 6a and 6b do not take into account the factor of s _k .

7 is a schematic diagram of interference analysis of a frequency domain response of a subcarrier on adjacent subcarriers, as shown in FIG. 7, although the frequency domain response of one subcarrier has interference to other frequency points, if adjacent frequency When the interval between points is an integer multiple of ΔF, the interference is zero.

Figure 8 is a schematic diagram of 802.11b-based spectral response and its analysis of adjacent channel interference, as shown in Figure 8, where the channel bandwidth is 20MHz, using 64-point IFFT/FFT transform, of which 52 subcarriers are used for data transmission, 8 It is a guard subcarrier that does not transmit data. It can be analyzed that if channel n is used for transmission, its interference power to adjacent channels n+1 and n-1 is lower than that of its own transmission signal. -20 ~ -30dB. As previously analyzed, if the channel n+1/n-1 is used for reception, its received power is nearly 30-40 dB lower than the transmission power of channel n.

The two cancel each other out, and the transmitted signal on channel n interferes with the received signal on channel n+1/n-1 by more than 10 dB. If effective interference cancellation is not performed, the receiver is completely inoperable.

9 is a schematic diagram of interference of a transmitted signal in a receiving channel, where a red line is a received signal and a black line is an interference signal, wherein the received signal and the transmitted signal power are assumed to be the same.

However, according to the previous analysis of the OFDM principle, if the frequency between the transmitted signal and the received signal on the AP side is completely synchronized, the transmitted signal has interference to the received signal, but the interference power on the designated receiving subcarrier is zero. If it is not synchronized, the corresponding interference signal exists, and the strength of the interference signal depends on the frequency difference between the two. FIG. 10a is a schematic diagram of the node side transmitting signal and the receiving signal completely synchronized, as shown in FIG. 10a, in the transmission When the downlink signal and the received uplink signal are completely synchronized, the inter-channel interference is 0; FIG. 10b is a schematic diagram of the node side transmitting signal and the receiving signal not completely synchronized, as shown in FIG. 10b, the downlink signal transmitted and When the received uplink signals are not fully synchronized, there is very serious interference between adjacent channels.

FIG. 11 is a schematic diagram showing the relationship between the interference power of the transmitted signal and the frequency deviation of the received signal when the transmitted signal and the received signal are not completely synchronized, and the uplink signal on the side of the node can be statistically obtained according to the results of FIG. 10a and FIG. 10b. The relationship between the interference power and the frequency deviation between the downlink signals, as shown in FIG. 11, assumes that the power of the transmitted signal leakage on the receiving channel is equal to the received signal power, and the abscissa is the frequency deviation normalized with respect to ΔF. It can be seen that when the frequency deviation between the transmitted signal and the received signal on the side of the node is less than 10%, the power of the transmitted signal on the adjacent receiving channel is less than -10 dB, which is basically negligible.

In summary, the method for processing adjacent to neighboring interference provided by the present invention obtains a basis for all the transmissions to be transmitted on the first channel by acquiring the frequency deviation of the uplink pilot signal and the downlink pilot signal on the second channel. The frequency deviation is compensated and retransmitted to ensure that the frequency deviation between the downlink signal sent by the local node and the received uplink signal is sufficiently small. After adopting the scheme used by the present invention, the AP can simultaneously adopt adjacent (or each other) There is interference between the channels for transmission and reception, which greatly increases the frequency of channel usage, from improving system throughput.

FIG. 12 is a schematic structural diagram of Embodiment 1 of a device for eliminating neighbor interference in a wireless system according to the present invention. As shown in FIG. 12, the processing device 10 for eliminating neighbor interference in the wireless system includes:

The receiving module 11 is configured to receive, by the second node, the second node to send to the processing device Generating a pilot signal, and receiving an interference signal generated by the downlink pilot signal sent by the local node to the first node through the first channel on the second channel;

The processing module 12 is configured to calculate a frequency deviation between the uplink pilot signal and the interference signal, and perform compensation processing on a signal to be sent to the first node on the first channel according to the frequency deviation, Obtaining the downlink signal after the compensation process;

The sending module 13 is configured to send the downlink signal that is processed by the compensation to the first node by using the first channel.

The apparatus for canceling the adjacent-band interference provided in this embodiment is used to perform the technical solution of the method embodiment shown in FIG. 1 , and the implementation principle and the technical effect are similar, and the receiving module receives the uplink guide sent by the second node on the second channel. And a frequency signal, and an interference signal of the downlink pilot signal sent by the first node to the first channel on the second channel, the processing module calculates a frequency deviation of the sum of the interference signal and the uplink pilot signal, and according to the frequency The deviation compensates the signal to be transmitted on the first channel, obtains the compensated downlink signal, and sends the downlink signal to the first node through the transmitting module, so that the frequency deviation between the downlink signal and the uplink signal on the second channel is sufficient Small, effectively reducing interference between adjacent channels and increasing the capacity of the communication system.

In the second embodiment of the processing device for eliminating the neighboring interference in the wireless system of the present invention, the processing module 12 is specifically configured to:

use

Performing a compensation process on the signal to be sent to the first node on the first channel, and acquiring a downlink signal after the compensation process;

Where j denotes an imaginary unit, t denotes a transmission time, y(t) denotes a signal to be transmitted to the first node on the first channel, ΔF ₀ denotes the frequency deviation, and y'(t) denotes the compensation The processed downlink signal.

Optionally, the receiving module 11 is specifically configured to:

Receiving the uplink pilot signal on all subcarriers of the first symbol;

Receiving the interference signal on all subcarriers of the second symbol;

Receiving the interference signal on a first subcarrier group of a third symbol, and receiving the uplink pilot signal on a second group of subcarriers of the third symbol;

The first symbol, the second symbol, and the third symbol are three symbols in a time domain; the first subcarrier group and the second subcarrier group of the third symbol respectively comprise multiple consecutive Subcarriers.

Optionally, the receiving module 11 is specifically configured to:

Receiving the interference signal on a first subcarrier group of the first symbol, and receiving the uplink pilot signal on a second subcarrier group of the second symbol;

Receiving the uplink pilot signal on a first subcarrier group of a second symbol, and receiving the interference signal on a second subcarrier group of the second symbol;

Receiving the interference signal on a first subcarrier group of a third symbol, and receiving the uplink pilot signal on a second subcarrier group of the second symbol;

The first symbol, the second symbol, and the third symbol are three symbols in a time domain; the first subcarrier group and the second subcarrier group of the first symbol respectively comprise multiple consecutive The first subcarrier group and the second subcarrier group of the second symbol respectively comprise a plurality of consecutive subcarriers, and the first subcarrier group and the second subcarrier group of the third symbol respectively include multiple Continuous subcarriers.

Optionally, the receiving module 11 is specifically configured to:

Receiving the uplink pilot signal on a subcarrier separated by one carrier from a first subcarrier of the first symbol, and subcarriers per one carrier separated from a second subcarrier of the first symbol Receiving the interference signal thereon;

Receiving the interference signal on subcarriers per one carrier separated from the first subcarrier of the second symbol, and receiving on subcarriers per one carrier separated from the second subcarrier of the second symbol The uplink pilot signal;

Receiving the uplink pilot signal on a subcarrier that is separated by one carrier from the first subcarrier of the third symbol, and subcarriers per one carrier from the second subcarrier of the third symbol Receiving the interference signal thereon;

The first symbol, the second symbol, and the third symbol are three symbols in a time domain; the first subcarrier and the second subcarrier of the first symbol are different sub-carriers in the frequency domain. The first subcarrier and the second subcarrier of the second symbol are different subcarriers in the frequency domain, and the first subcarrier and the second subcarrier of the third symbol are different subcarriers in the frequency domain.

Optionally, the processing module 12 is further configured to:

Calculating and acquiring a plurality of first uplink pilot frequency offsets according to an uplink pilot signal on a subcarrier of the first symbol and an uplink pilot signal on a subcarrier of the third symbol having the same frequency, and Having averaged the plurality of first uplink pilot frequency offsets to obtain an uplink pilot frequency offset;

Acquiring and acquiring the plurality of first interference signal frequency offsets according to the interference signal on the subcarrier of the second symbol and the interference signal on the subcarrier of the third symbol having the same frequency, and calculating the plurality of first interference signal frequency deviations An interference signal frequency deviation is averaged to obtain an interference signal frequency deviation;

Calculating a difference between the interference signal frequency deviation and the uplink pilot frequency deviation to obtain the frequency deviation.

The processing device for canceling the neighboring band interference provided in this embodiment is used to perform the technical solution of the method embodiment shown in FIG. 1 to FIG. 11. The implementation principle and technical effects are similar, and details are not described herein again.

FIG. 13 is a schematic structural diagram of Embodiment 1 of a processing device for eliminating neighbor interference in a wireless system according to the present invention. As shown in FIG. 13, the processing device 20 for eliminating neighbor interference in the wireless system includes:

The receiver 21 is configured to receive an uplink pilot signal that is sent by the second node to the processing device by using the second channel, and receive a downlink pilot signal that is sent by the local node to the first node by using the first channel. Interference signals generated on the two channels;

The processor 22 is configured to calculate a frequency offset between the uplink pilot signal and the interference signal, and perform compensation processing on a signal to be sent to the first node on the first channel according to the frequency deviation, Obtaining the downlink signal after the compensation process;

The transmitter 23 is configured to send the downlink signal that is processed by the compensation to the first node by using the first channel.

The processing device for canceling the neighboring band interference provided in this embodiment is used to perform the technical solution of the method embodiment shown in FIG. 1 , and the implementation principle and the technical effect are similar. The receiver receives the uplink information sent by the second node on the second channel. a frequency signal, and an interference signal of the downlink pilot signal sent by the first node to the first channel on the second channel, the processor calculates a frequency deviation of the sum of the interference signal and the uplink pilot signal, and according to the frequency Deviation compensates for the signal to be transmitted on the first channel, obtains the compensated downlink signal, and transmits it to the first node through the transmitter, so that the frequency deviation between the downlink signal and the uplink signal on the second channel is sufficient Small, effectively reducing interference between adjacent channels and increasing the capacity of the communication system.

In the second embodiment of the processing device for eliminating the neighboring interference in the wireless system of the present invention, the processor 22 is specifically configured to:

use

Performing a compensation process on the signal to be sent to the first node on the first channel, and acquiring a downlink signal after the compensation process;

Where j denotes an imaginary unit, t denotes a transmission time, y(t) denotes a signal to be transmitted to the first node on the first channel, ΔF ₀ denotes the frequency deviation, and y'(t) denotes the compensation The processed downlink signal.

Optionally, the receiver 21 is specifically configured to:

Receiving the uplink pilot signal on all subcarriers of the first symbol;

Receiving the interference signal on all subcarriers of the second symbol;

Receiving the interference signal on a first subcarrier group of a third symbol, and receiving the uplink pilot signal on a second group of subcarriers of the third symbol;

The first symbol, the second symbol, and the third symbol are three symbols in a time domain; the first subcarrier group and the second subcarrier group of the third symbol respectively comprise multiple consecutive Subcarriers.

Optionally, the receiver 21 is specifically configured to:

Receiving the interference signal on a first subcarrier group of the first symbol, and receiving the uplink pilot signal on a second subcarrier group of the second symbol;

Receiving the uplink pilot signal on a first subcarrier group of a second symbol, and receiving the interference signal on a second subcarrier group of the second symbol;

Receiving the interference signal on a first subcarrier group of a third symbol, and receiving the uplink pilot signal on a second subcarrier group of the second symbol;

The first symbol, the second symbol, and the third symbol are three symbols in a time domain; the first subcarrier group and the second subcarrier group of the first symbol respectively comprise multiple consecutive The first subcarrier group and the second subcarrier group of the second symbol respectively comprise a plurality of consecutive subcarriers, and the first subcarrier group and the second subcarrier group of the third symbol respectively include multiple Continuous subcarriers.

Optionally, the receiver 21 is specifically configured to:

Receiving the uplink pilot signal on a subcarrier separated by one carrier from a first subcarrier of the first symbol, and subcarriers per one carrier separated from a second subcarrier of the first symbol Receiving the interference signal thereon;

Receiving the interference signal on subcarriers per one carrier separated from the first subcarrier of the second symbol, and receiving on subcarriers per one carrier separated from the second subcarrier of the second symbol The uplink pilot signal;

Receiving on subcarriers per one carrier separated from the first subcarrier of the third symbol The uplink pilot signal, and receiving the interference signal on a subcarrier that is separated by one carrier from a second subcarrier of the third symbol;

The first symbol, the second symbol, and the third symbol are three symbols in a time domain; the first subcarrier and the second subcarrier of the first symbol are different sub-carriers in the frequency domain. The first subcarrier and the second subcarrier of the second symbol are different subcarriers in the frequency domain, and the first subcarrier and the second subcarrier of the third symbol are different subcarriers in the frequency domain.

Optionally, the processor 22 is further configured to:

Calculating and acquiring a plurality of first uplink pilot frequency offsets according to an uplink pilot signal on a subcarrier of the first symbol and an uplink pilot signal on a subcarrier of the third symbol having the same frequency, and Having averaged the plurality of first uplink pilot frequency offsets to obtain an uplink pilot frequency offset;

Acquiring and acquiring the plurality of first interference signal frequency offsets according to the interference signal on the subcarrier of the second symbol and the interference signal on the subcarrier of the third symbol having the same frequency, and calculating the plurality of first interference signal frequency deviations An interference signal frequency deviation is averaged to obtain an interference signal frequency deviation;

Calculating a difference between the interference signal frequency deviation and the uplink pilot frequency deviation to obtain the frequency deviation.

The processing device for eliminating the neighboring band interference provided in this embodiment is used to perform the technical solution of the method embodiment shown in FIG. 1 to FIG. 11. The implementation principle and technical effects are similar, and details are not described herein again.

Further, in the first embodiment and the second embodiment of the foregoing processing apparatus for eliminating the neighboring interference, it should be understood that the processor 21 may be a central processing unit (English: Central Processing Unit, CPU for short), and may be other General-purpose processor, digital signal processor (English: Digital Signal Processor, DSP for short), application specific integrated circuit (ASIC), ready-made programmable gate array (English: Field-Programmable Gate Array, Abbreviation: FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method.

One of ordinary skill in the art can understand that all or part of the steps of the above method embodiments are implemented. The foregoing program may be stored in a computer readable storage medium, and when executed, the program includes the steps of the foregoing method embodiment; and the foregoing storage medium includes: ROM, RAM A variety of media that can store program code, such as a disk or a disc.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims (12)

1. A processing method for eliminating neighbor interference in a wireless system, comprising:

   The node receives the uplink pilot signal sent by the second node to the local node by using the second channel, and receives the interference generated by the downlink pilot signal sent by the local node to the first node by using the first channel on the second channel. signal;

   The node calculates a frequency deviation between the uplink pilot signal and the interference signal, and performs compensation processing on a signal to be sent to the first node on the first channel according to the frequency deviation, and obtains compensation. The processed downlink signal;

   The local node sends the downlink signal after the compensation processing to the first node by using the first channel.
2. The method according to claim 1, wherein the local node performs a compensation process on a signal to be sent to the first node on the first channel according to the frequency deviation, and obtains a downlink signal after the compensation process, including :

   The node adopts

   

   Performing a compensation process on the signal to be sent to the first node on the first channel, and acquiring a downlink signal after the compensation process;

   Where j denotes an imaginary unit, t denotes a transmission time, y(t) denotes a signal to be transmitted to the first node on the first channel, ΔF ₀ denotes the frequency deviation, and y'(t) denotes the compensation The processed downlink signal.
3. The method according to claim 1 or 2, wherein the local node receives an uplink pilot signal sent by the second node to the local node through the second channel, and receives the first node to pass the first node to the first node. The interference signal generated by the downlink pilot signal transmitted by the channel on the second channel includes:

   The local node receives the uplink pilot signal on all subcarriers of the first symbol;

   The local node receives the interference signal on all subcarriers of the second symbol;

   The local node receives the interference signal on a first subcarrier group of a third symbol, and receives the uplink pilot signal on a second group of subcarriers of the third symbol;

   The first symbol, the second symbol, and the third symbol are three symbols in a time domain; the first subcarrier group and the second subcarrier group of the third symbol respectively comprise multiple consecutive Subcarriers.
4. The method according to claim 1 or 2, wherein the local node receives the second An uplink pilot signal sent by the node to the local node by using the second channel, and receiving an interference signal generated by the downlink pilot signal sent by the local node to the first node by using the first channel on the second channel, including:

   The local node receives the interference signal on a first subcarrier group of a first symbol, and receives the uplink pilot signal on a second subcarrier group of the second symbol;

   The local node receives the uplink pilot signal on a first subcarrier group of a second symbol, and receives the interference signal on a second subcarrier group of the second symbol;

   The local node receives the interference signal on a first subcarrier group of a third symbol, and receives the uplink pilot signal on a second subcarrier group of the second symbol;

   The first symbol, the second symbol, and the third symbol are three symbols in a time domain; the first subcarrier group and the second subcarrier group of the first symbol respectively comprise multiple consecutive The first subcarrier group and the second subcarrier group of the second symbol respectively comprise a plurality of consecutive subcarriers, and the first subcarrier group and the second subcarrier group of the third symbol respectively include multiple Continuous subcarriers.
5. The method according to claim 1 or 2, wherein the local node receives an uplink pilot signal sent by the second node to the local node through the second channel, and receives the first node to pass the first node to the first node. The interference signal generated by the downlink pilot signal transmitted by the channel on the second channel includes:

   The local node receives the uplink pilot signal on a subcarrier of each one or more subcarriers starting from a first subcarrier of the first symbol, and starting from a second subcarrier of the first symbol Receiving the interference signal on each subcarrier separated by one or more subcarriers;

   The local node receives the interference signal on subcarriers of each one or more subcarriers starting from a first subcarrier of the second symbol, and each interval starting from a second subcarrier of the second symbol Receiving the uplink pilot signal on subcarriers of one or more subcarriers;

   The local node receives the uplink pilot signal on a subcarrier of each one or more subcarriers starting from a first subcarrier of the third symbol, and starts from a second subcarrier of the third symbol Receiving the interference signal on each subcarrier separated by one or more subcarriers;

   The first symbol, the second symbol, and the third symbol are three symbols in a time domain; the first subcarrier and the second subcarrier of the first symbol are different sub-carriers in the frequency domain. a carrier, a first subcarrier and a second subcarrier of the second symbol are different subcarriers in a frequency domain, and the third symbol The first subcarrier and the second subcarrier are different subcarriers in the frequency domain.
6. The method according to any one of claims 3 to 5, wherein the local node calculates a frequency deviation between the uplink pilot signal and the interference signal, including:

   The local node calculates and acquires a plurality of first uplink pilot frequencies according to an uplink pilot signal on a subcarrier of the first symbol and an uplink pilot signal on a subcarrier of the third symbol having the same frequency Deviating, and averaging the plurality of first uplink pilot frequency offsets to obtain an uplink pilot frequency offset;

   The local node calculates, according to the interference signal on the subcarrier of the second symbol and the interference signal on the subcarrier of the third symbol with the same frequency, the frequency deviation of the plurality of first interference signals, and Determining a plurality of first interference signal frequency deviations to obtain an interference signal frequency deviation;

   The local node calculates a difference between the interference signal frequency deviation and the uplink pilot frequency deviation to obtain the frequency deviation.
7. A processing device for eliminating neighbor interference in a wireless system, comprising:

   a receiving module, configured to receive an uplink pilot signal sent by the second node to the processing device by using the second channel, and receive a downlink pilot signal sent by the local node to the first node by using the first channel in the second Interference signals generated on the channel;

   a processing module, configured to calculate a frequency deviation between the uplink pilot signal and the interference signal, and perform compensation processing on the signal to be sent to the first node on the first channel according to the frequency deviation, and obtain Compensating the processed downlink signal;

   And a sending module, configured to send the downlink signal that is processed by the compensation to the first node by using the first channel.
8. The device according to claim 7, wherein the processing module is specifically configured to:

   use

   

   Performing a compensation process on the signal to be sent to the first node on the first channel, and acquiring a downlink signal after the compensation process;

   Where j denotes an imaginary unit, t denotes a transmission time, y(t) denotes a signal to be transmitted to the first node on the first channel, ΔF ₀ denotes the frequency deviation, and y'(t) denotes the compensation The processed downlink signal.
9. The device according to claim 7 or 8, wherein the receiving module is specifically configured to:

   Receiving the uplink pilot signal on all subcarriers of the first symbol;

   Receiving the interference signal on all subcarriers of the second symbol;

   Receiving the interference signal on a first subcarrier group of a third symbol, and receiving the uplink pilot signal on a second group of subcarriers of the third symbol;

   The first symbol, the second symbol, and the third symbol are three symbols in a time domain; the first subcarrier group and the second subcarrier group of the third symbol respectively comprise multiple consecutive Subcarriers.
10. The device according to claim 7 or 8, wherein the receiving module is specifically configured to:

    Receiving the interference signal on a first subcarrier group of the first symbol, and receiving the uplink pilot signal on a second subcarrier group of the second symbol;

    Receiving the uplink pilot signal on a first subcarrier group of a second symbol, and receiving the interference signal on a second subcarrier group of the second symbol;

    Receiving the interference signal on a first subcarrier group of a third symbol, and receiving the uplink pilot signal on a second subcarrier group of the second symbol;

    The first symbol, the second symbol, and the third symbol are three symbols in a time domain; the first subcarrier group and the second subcarrier group of the first symbol respectively comprise multiple consecutive The first subcarrier group and the second subcarrier group of the second symbol respectively comprise a plurality of consecutive subcarriers, and the first subcarrier group and the second subcarrier group of the third symbol respectively include multiple Continuous subcarriers.
11. The device according to claim 7 or 8, wherein the receiving module is specifically configured to:

    Receiving the uplink pilot signal on a subcarrier separated by one carrier from a first subcarrier of the first symbol, and subcarriers per one carrier separated from a second subcarrier of the first symbol Receiving the interference signal thereon;

    Receiving the interference signal on subcarriers per one carrier separated from the first subcarrier of the second symbol, and receiving on subcarriers per one carrier separated from the second subcarrier of the second symbol The uplink pilot signal;

    Receiving the uplink pilot signal on a subcarrier that is separated by one carrier from the first subcarrier of the third symbol, and subcarriers per one carrier from the second subcarrier of the third symbol Receiving the interference signal thereon;

    The first symbol, the second symbol, and the third symbol are three symbols in a time domain; the first subcarrier and the second subcarrier of the first symbol are subcarriers with different frequency domains. The first subcarrier and the second subcarrier of the second symbol are subcarriers with different frequency domains, and the first subcarrier and the second subcarrier of the third symbol are subcarriers with different frequency domains.
12. The device according to any one of claims 9 to 11, wherein the processing module is further configured to:

    Calculating and acquiring a plurality of first uplink pilot frequency offsets according to an uplink pilot signal on a subcarrier of the first symbol and an uplink pilot signal on a subcarrier of the third symbol having the same frequency, and Having averaged the plurality of first uplink pilot frequency offsets to obtain an uplink pilot frequency offset;

    Acquiring and acquiring the plurality of first interference signal frequency offsets according to the interference signal on the subcarrier of the second symbol and the interference signal on the subcarrier of the third symbol having the same frequency, and calculating the plurality of first interference signal frequency deviations An interference signal frequency deviation is averaged to obtain an interference signal frequency deviation;

    Calculating a difference between the interference signal frequency deviation and the uplink pilot frequency deviation to obtain the frequency deviation.

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