CN114915532A

CN114915532A - Communication method and related device

Info

Publication number: CN114915532A
Application number: CN202210473501.6A
Authority: CN
Inventors: 黄亚东; 曾焱
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2022-08-16
Also published as: CN112583754B; WO2021063140A1; CN112583754A

Abstract

The embodiment of the application provides a communication method and a related device, wherein the method comprises the following steps: determining that periodic impulse noise is present in a power line between a first communication device and a second communication device; determining a transmission unit according to a repetition period of the periodic impulse noise, wherein the transmission unit comprises an Orthogonal Frequency Division Multiplexing (OFDM) symbol, the OFDM symbol comprises an interval part and a non-interval part, the non-interval part is used for carrying traffic data and/or control data, the length of the interval part is greater than or equal to k, and the length of the repetition period is equal to N times of the length of the transmission unit; and sending a first indication message to the second communication device, wherein the first indication message is used for indicating information of a subcarrier interval and the length of the interval part, and the subcarrier interval is associated with the length of the OFDM symbol. The technical scheme can reduce the interference of the periodic impulse noise in the power line communication to the normal communication.

Description

Communication method and related device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a communication method and a related apparatus.

Background

Power Line Communication (PLC) is a Communication method for transmitting data by using a Power Line. The power line communication technology can transmit data by utilizing the arranged power transmission line to the maximum extent, thereby saving a great deal of wiring cost.

Power lines are the medium through which power is transmitted. Therefore, it is not considered as a communication transmission medium when designing and laying power lines. Therefore, a power line communication device (e.g., a power modem) and a power consuming device (e.g., a household appliance) operate in the same network. Special circuit structures and components (e.g., rectifier circuits, motors, etc.) in the powered device can generate noise signals in the power line network. These noise signals can interfere with the power line communication signals, thereby affecting the rate of power line communication and further affecting the related services carried on the communication channel.

Disclosure of Invention

The embodiment of the application provides a communication method and a related device, which can reduce the interference of periodic impulse noise in power line communication to normal communication.

In a first aspect, an embodiment of the present application provides a communication method, including: determining that periodic impulse noise exists in a power line between a first communication device and a second communication device, wherein the length between a starting impulse point and a last impulse point, the energy of which is greater than or equal to a threshold value, in each impulse noise in the periodic impulse noise is k, and k is a number greater than 0; determining a transmission unit according to a repetition period of the periodic impulse noise, wherein the transmission unit comprises an Orthogonal Frequency Division Multiplexing (OFDM) symbol, the OFDM symbol comprises an interval part and a non-interval part, the non-interval part is used for carrying service data and/or control data, the length of the interval part is greater than or equal to k, the length of the repetition period is equal to N times of the length of the transmission unit, and N is a positive integer greater than or equal to 1; and sending a first indication message to the second communication device, wherein the first indication message is used for indicating information of a subcarrier interval and the length of the interval part, and the subcarrier interval is associated with the length of the OFDM symbol.

By the technical scheme, the main part of the periodic impulse noise can fall in the interval part of the OFDM symbol. The spacing part is mainly used for suppressing the interference between symbols and does not participate in the demodulation of signals. Thus, whether the receiver can successfully receive and demodulate the content carried by the gap portion has no effect on the communication of useful data (e.g., traffic data and/or control data) between the receiver and the transmitter. For convenience of description, the data carried by the interval part may be referred to as useless data. By adjusting the structure of the data unit, it is possible to make all or most of the impulse noise that periodically occurs partially overlap with the interval for transmitting useless data. In other words, traffic data and/or control data between the first communication device and the second communication device are transmitted at a time when impulse noise is absent or small. In this way, the influence of impulse noise on data transmission can be reduced.

In one possible design, the first indication message includes first time information indicating a target time when the second communication device transmits the transmission unit according to the periodic impulse noise.

Based on the technical scheme, the periodic impulse noise is detected and determined by the receiving side equipment of the transmission unit. The periodic impulse noise has the largest influence on the receiving side. It is convenient for the receiving side device (i.e. the first communication device) to perform noise detection and determine the relevant parameters of the transmission unit. In addition, in the above counting scheme, the transmitting side device (i.e., the second communication device) may also detect the periodic impulse noise. Thus, the transmitting-side apparatus can ensure that all or most of the periodically occurring impulse noise partially overlaps the interval for transmitting the useless data by only having to transmit the transmission unit after waiting for the target time after detecting the periodic impulse noise.

In one possible design, the method further includes: and sending a second indication message to the second communication device, wherein the second indication message comprises second time information, and the second time information is used for indicating the starting time of the transmission unit sent by the second communication device.

In some cases, the transmitting-side device may not be able to detect the periodic impulse noise. In this case, the reception-side apparatus may be responsible for determining a start time for starting transmission of the transmission unit and indicating the start time to the transmission-side apparatus. Thus, the transmitting-side apparatus can start transmission of the transmission unit directly based on the start time, which can ensure that all or most of the periodically occurring impulse noise partially overlaps with the interval for transmitting the unnecessary data.

In one possible design, when the length of the repetition period is greater than or equal to the length of one OFDM symbol determined in advance, the length of the OFDM symbol in the transmission unit is the length of the OFDM symbol determined in advance.

In one possible design, the length of the OFDM symbol determined in advance is determined according to the length of the repetition period.

In one possible design, the transmission unit further includes passband symbols for carrying traffic data and/or control data.

Optionally, in some embodiments, in a case where the length of the repetition period of the periodic impulse noise is greater than or equal to 1.5 times and less than or equal to 2 times the length of the payload part of the standard OFDM symbol, the passband symbol is included in the transmission unit. If a transmission unit is also composed of only one OFDM symbol, the length of the non-gap portion in the OFDM symbol is close to or equal to the length of the payload portion of 1 standard OFDM symbol. This results in a waste of transmission resources. Therefore, the transmission unit structure of the above technical solution adds a passband symbol, and the passband symbol may be used for carrying traffic data and/or control data. In this way, data transmission can be performed more efficiently.

In one possible design, before the sending the first indication information to the second communication device, the method further includes: the target time is determined according to the length of the interval part and the width of first impulse noise, wherein the first impulse noise is any one of the periodic impulse noise.

In one possible design, the determining the target time based on the length of the interval portion and the width of the first impulse noise includes: determining the target time as a difference between the length of the transmission unit and a first time length from a peak of the first impulse noise to an upper boundary of a spaced portion corresponding to the first impulse, in case that the length of the spaced portion is smaller than the width of the first impulse noise; and under the condition that the length of the interval part is greater than or equal to the width of the first impulse noise, determining the target time according to the length of the interval part, the length of the transmission unit, a second time length and a third time length, wherein the second time length is the time length from the peak of the first impulse noise to the starting boundary of the first impulse noise, and the third time length is the time length from the peak of the first impulse noise to the ending boundary of the first impulse noise.

In one possible design, where the length of the interval portion is less than the width of the first impulse noise, the energy of the first impulse noise within the interval portion corresponding to the first impulse is greater than the energy outside the interval portion corresponding to the first impulse.

In one possible design, the determining the target time based on the length of the interval portion, the length of the transmission unit, the second time period, and the third time period includes: the target time is determined according to the following formula: t _ d ═ T-w/2+ (B _ up-B _ down)/2, where T _ d represents the target time, T represents the length of the transmission unit, B _ down represents the second time duration, B _ up represents the third time duration, and w represents the length of the interval part.

In a second aspect, embodiments of the present application provide a signal processing apparatus, which may be a communication device or a component (e.g., a chip or a circuit) in the communication device. The signal processing device comprises a processing module and a sending module. When the signal processing apparatus is a communication device, the processing unit may be a processor, and the transmitting unit may be a transmitter; the communication device may further include a storage module, which may be a memory; the storage module is configured to store instructions, and the processing module executes the instructions stored by the storage module to cause the communication device to perform the method in the first aspect. When the signal processing apparatus is a component (e.g., a chip or a circuit, etc.) in a communication device, the processing module may be a processor, and the transmitting module may be an input/output interface, a pin or a circuit, etc.; the processing module may store instructions to cause the communication device to perform the method of the first aspect, and the storage module may be a storage unit (e.g., a register, a cache, etc.) inside the chip or a storage unit (e.g., a read-only memory, a random access memory, etc.) outside the chip inside the communication device.

In a third aspect, a computer program product is provided, the computer program product comprising: computer program code which, when run on a computer, causes the computer to perform the method of the above-mentioned aspects.

It should be noted that, all or part of the computer program code may be stored in the first storage medium, where the first storage medium may be packaged together with the processor or may be packaged separately from the processor, and this is not specifically limited in this embodiment of the present application.

In a fourth aspect, a computer-readable medium is provided, which stores program code, which, when run on a computer, causes the computer to perform the method of the above-mentioned aspects.

Drawings

FIG. 1 is a schematic diagram of a periodic impulse noise.

Fig. 2 shows two standard OFDM symbols.

Fig. 3 is a schematic diagram of a transmission unit for transmission between a receiver and a transmitter.

Fig. 4 is a schematic diagram of a transmission unit for transmission between a receiver and a transmitter.

Fig. 5 is a schematic diagram of a transmission unit for transmission between a receiver and a transmitter.

Fig. 6 is a schematic diagram of a transmission unit for transmission between a receiver and a transmitter.

Fig. 7 is a schematic diagram of a transmission unit for transmission between a receiver and a transmitter.

Fig. 8 is a diagram of the start time and latency for a transmitter to transmit a transmission unit.

Fig. 9 is a schematic diagram of determining the length of a target time.

Fig. 10 is a schematic diagram of another method of determining the length of a target time.

Fig. 11 is a schematic flow chart of detecting whether the noise is periodic impulse noise.

Fig. 12 is a communication method according to an embodiment.

Fig. 13 is a schematic structural diagram of a signal processing apparatus provided according to an embodiment of the present application.

Fig. 14 is a block diagram of a communication device provided according to an embodiment of the present invention.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

This application is intended to present various aspects, embodiments or features around a system that may include a number of devices, components, modules, and the like. It is to be understood and appreciated that the various systems may include additional devices, components, modules, etc. and/or may not include all of the devices, components, modules etc. discussed in connection with the figures. Furthermore, a combination of these schemes may also be used.

In addition, in the embodiments of the present application, words such as "exemplary", "for example", etc. are used to mean serving as examples, illustrations or explanations. Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the term using examples is intended to present concepts in a concrete fashion.

In the embodiments of the present application, information (information), signal (signal), and message (message) may be mixed, and it should be noted that the intended meanings are consistent when the differences are not emphasized. "corresponding" and "corresponding" may sometimes be used in combination, it being noted that the intended meaning is consistent when no distinction is made.

In the examples of the present application, the subscripts are sometimes as W ₁ May be wrongly written or not writtenThe target form, such as W1, is intended to be consistent when its distinctions are not emphasized.

The network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not form a limitation on the technical solution provided in the embodiment of the present application, and as a person of ordinary skill in the art knows that along with the evolution of the network architecture and the appearance of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.

Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless otherwise specifically stated.

In this application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a alone, A and B together, and B alone, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.

The technical scheme of the application can be applied to power line communication systems following G.hn standards, Home Plug Power line Alliance (Homeplug) and the like.

For convenience of description, some concepts involved in the embodiments of the present application will be briefly described first.

(1) Periodic impulse noise

Most of the electrical appliances generate impulse noise which is periodically and repeatedly generated. Such periodically occurring impulse noise may be referred to as periodic impulse noise.

FIG. 1 is a schematic diagram of a periodic impulse noise. The impulse noise shown in fig. 1 occurs periodically and repeatedly. The distance between the peaks (i.e., the positions where the noise amplitude is maximum) of two adjacent impulse noises is equal. The distance between peaks of two adjacent impulse noises may be referred to as the length of a repetition period of the periodic impulse noise. For convenience of description, rep is used in the embodiment of the present application to denote the length of the repetition period of the periodic impulse noise.

(2) An OFDM (Orthogonal Frequency Division Multiplexing) symbol g.hn power line communication system adopts an OFDM modulation mode, and a minimum unit for transmission of a transmitter and a receiver is an OFDM symbol. The length of an OFDM symbol for transmitting traffic data and/or traffic data in a power line communication system is equal to the length of the OFDM symbol if there is no periodic impulse noise in the power line communication system. This OFDM symbol may be referred to as a standard OFDM symbol or a default OFDM symbol.

A standard OFDM symbol may consist of a Cyclic Prefix (CP) part and a payload part. Fig. 2 is a schematic diagram of a standard OFDM symbol. Fig. 2 shows two standard OFDM symbols. As shown in fig. 2, each of two standard OFDM symbols includes one CP portion and one load portion.

The size of a payload part used for Fast Fourier Transform (FFT), subcarrier spacing (SCS), and a sampling rate in a standard OFDM symbol satisfy the following relationship:

fs/Nstd-SCS, equation 1

Where fs represents the sampling rate, Nstd represents the size of the load portion in a standard OFDM symbol for FFT, and SCS represents the subcarrier spacing.

The size and the number of subcarriers used for FFT are related as follows:

nstd is 2 × Tstd, formula 2

Where Tstd denotes the number of subcarrier intervals of the payload part of the standard OFDM symbol and Nstd denotes the size of the payload part in the standard OFDM symbol for FFT.

The number and duration of the sub-carrier intervals have the following relations

Lstd ═ Nstd/fs, equation 3

Where Lstd denotes the length of the payload part of the standard OFDM symbol, Tstd denotes the number of subcarrier intervals of the CP part of the standard OFDM symbol, and fs denotes the sampling rate.

The length of the CP part and the length of the load part of the standard OFDM symbol satisfy the following relation:

lcp is (Lstd/32) × k, formula 4

Lcp denotes the length of the CP portion in the standard OFDM symbol, Lstd denotes the size of the load portion in the standard OFDM symbol for FFT, k is 1,2, …,8, and k is generally 4 or 8.

Taking the g.hn standard as an example, the effective bandwidth is 100MHz, the sampling rate is 200MHz, and the subcarrier spacing is 24.414K. Substituting the above sampling rate and subcarrier spacing into equation 1, the obtained Nstd is the size of the load part of the standard OFDM symbol for performing FFT. The number of sub-carriers of the payload portion of the standard OFDM symbol is equal to 4096. The number of subcarriers of the load part of the standard OFDM symbol is substituted into formula 3 to obtain the length Lstd of the load part of the standard OFDM symbol. The length of the payload portion of the standard OFDM symbol is equal to 40.96 microseconds (μ β). Substituting the size of the load part of the standard OFDM symbol for FFT into formula 4 to obtain the length Lcp of the CP part of the standard OFDM symbol. Assuming that the value of k is 8, the length of the CP portion of the standard OFDM symbol is equal to 10.24 μ s.

In the following embodiments, the length of the payload portion in the standard OFDM symbol is denoted by Lstd, and the length of the CP portion in the OFDM symbol is denoted by Lcp. The term "length" in the embodiments of the present application may be understood as a time length, and may also be referred to as a time duration.

The length of the repetition period of the periodic impulse noise and the length of the loading part of the standard OFDM symbol may have the following relations:

relation 1, 1 × Lstd < rep ≦ 2 × Lstd, that is, the length of the repetition period of the periodic impulse noise is greater than the length of the load part of 1 standard OFDM symbol and less than or equal to the length of the load part of two standard OFDM symbols;

relation 2, rep >2 × Lstd, i.e. the length of the repetition period of the periodic impulse noise is larger than the length of the load part of 2 standard OFDM symbols;

relation 3, rep ≦ 1 × Lstd, i.e., the length of the repetition period of the periodic impulse noise is less than or equal to the length of the payload portion of 1 standard OFDM symbol.

The following describes schematic structural diagrams of a transmission unit for transmitting traffic data and/or control data between a transmitter and a receiver in the above three relations with reference to fig. 3 to 7, respectively. The structural diagrams of the transmission units shown in fig. 3 to 7 are structural diagrams of a transmission unit for transmission between a transmitter and a receiver in the case where periodic impulse noise is detected between the transmitter and the receiver.

Fig. 3 is a schematic diagram of a transmission unit for transmission between a receiver and a transmitter. The schematic configuration shown in fig. 3 is a schematic configuration of the transmission unit in the case of the above-described relation 1.

Fig. 3 shows two transmission units, each of which consists of one OFDM symbol as shown in fig. 3. The length of each transmission unit is the same as the length of the repetition period of the periodic impulse noise.

Each transmission unit is composed of a spaced portion and a non-spaced portion. The non-gap portion is used to carry traffic data and/or control data. The length of the non-spaced portion is equal to the length of the payload portion of a standard OFDM symbol. The length of the interval part is equal to the difference between the length of the repetition period and the length of the payload part of the standard OFDM symbol.

With L _gap3 The length of the spacing part in the transmission unit shown in fig. 3 is represented by L _data3 The length of the non-spaced portion in the transmission unit shown in fig. 3 is shown. Then L _gap3 、L _data3 Lstd and rep satisfy the following relationships: l is _data3 ＝Lstd；L _gap3 ＝rep-L _data3 。

For convenience of description, the OFDM symbol in the transmission unit as shown in fig. 3 will be referred to as a first OFDM symbol hereinafter.

Fig. 4 is a schematic diagram of a transmission unit for transmission between a receiver and a transmitter. The schematic configuration shown in fig. 4 is a schematic configuration of another transmission unit in the case of the above-described relation 1.

Fig. 4 shows two transmission units, each of which is composed of one OFDM symbol and one passband (passband) symbol as shown in fig. 4. The length of each transmission unit is the same as the length of the repetition period of the periodic impulse noise.

Each transmission unit is composed of a spaced portion and a non-spaced portion. The non-gap portion is used to carry traffic data and/or control data. The length of the non-spaced portion is equal to the length of the payload portion of a standard OFDM symbol.

With L _gap4 The length of the spacing section in the transmission unit shown in fig. 4 is represented by L _data4 The length of the non-spaced portion in the transmission unit shown in fig. 4 is represented by L _pass The length of the pass band symbol in the transmission unit shown in fig. 4 is identified. Then L _gap4 、L _data4 、L _pass Nstd and rep satisfy the following relationships: l is _data4 ＝Lstd，L _pass ＝Lstd/m，rep＝L _gap4 +L _data4 +L _pass . m is 2 ^t T is a positive integer greater than or equal to 1, and t can generally have a value of 1 or 2.

In the case of the above relation 1, the length of the repetition period of the periodic impulse noise may be close to or equal to the length of the loading portions of the two standard OFDM symbols. In this case, if one transmission unit is also composed of only one OFDM symbol, the length of the non-spaced portion in the OFDM symbol is close to or equal to the payload portion length of 1 standard OFDM symbol. This results in a waste of transmission resources. Thus, the transmission cell structure shown in fig. 4 adds pass-band symbols that may be used to carry traffic data and/or control data. In this way, data transmission can be performed more efficiently.

Optionally, in some embodiments, in a case that the length of the repetition period of the periodic impulse noise is greater than the length of the load part of 1 standard OFDM symbol and less than 1.5 times the length of the load part of the standard OFDM symbol, the structure of the transmission unit as shown in fig. 3 may be adopted; in the case where the length of the repetition period of the periodic impulse noise is greater than or equal to 1.5 times and less than or equal to 2 times the length of the payload part of the standard OFDM symbol, the structure of the transmission unit as shown in fig. 4 may be employed.

For convenience of description, the OFDM symbol in the transmission unit as shown in fig. 4 will be referred to as a second OFDM symbol hereinafter.

Fig. 5 is a schematic diagram of a transmission unit for transmission between a receiver and a transmitter. The schematic configuration shown in fig. 5 is a schematic configuration of the transmission unit in the case of the above-described relation 2.

Fig. 5 shows four transmission units, each of which consists of one OFDM symbol as shown in fig. 5. The sum of the lengths of the two transmission units is the same as the length of the repetition period of the periodic impulse noise.

With L _gap5 The length of the spacing part in the transmission unit shown in fig. 5 is represented by L _data5 The length of the non-spaced portion in the transmission unit shown in fig. 3 is shown. Then L _gap5 、L _data5 Lstd and rep satisfy the following relationships: l is _data5 ＝Lstd；L _gap5 ＝(rep-L _data5 ×2)/2。

If the length of the repetition period of the periodic impulse noise is the same as the sum of the lengths of n transmission units, the relationship of the spaced portion, the non-spaced portion, rep in each transmission unit satisfies the following formula:

L _gapn ＝(rep-L _datan ×n)/n，

wherein L is _gapn Denotes the length of the spacer portion, L _datan Denotes the length of the non-spaced part, n is a positive integer of 2 or more, L _datan ＝Lstd。

For convenience of description, the OFDM symbol in the transmission unit as shown in fig. 5 will be referred to as a third OFDM symbol hereinafter.

Alternatively, in other embodiments, if the length of the repetition period of the periodic impulse noise and the length of the loading portion of the standard OFDM symbol satisfy the above relationship 2, one transmission unit may include one OFDM symbol and one passband symbol. In this case, the structure of the transmission unit can be referred to as shown in fig. 4 and fig. 5, and for brevity, will not be described again here.

Fig. 6 is a schematic diagram of a transmission unit for transmission between a receiver and a transmitter. The schematic configuration shown in fig. 6 is a schematic configuration of the transmission unit in the case of the above-described relationship 3.

Fig. 6 shows two transmission units, each of which consists of one OFDM symbol as shown in fig. 6. The length of each transmission unit is the same as the length of the repetition period of the periodic impulse noise.

Each transmission unit is composed of a spaced portion and a non-spaced portion. The non-gap portion is used to carry traffic data and/or control data.

With L _gap6 The length of the spacing part in the transmission unit shown in fig. 6 is represented by L _data6 The length of the non-spaced portion in the transmission unit shown in fig. 6 is shown. Then L _gap6 、L _data6 Lstd and rep satisfy the following relationships: l is _data6 ＝Lstd×2 ^k ；L _gap6 ＝rep-L _data6 Wherein k is a negative integer less than or equal to-1.

For convenience of description, an OFDM symbol in the transmission unit as shown in fig. 6 will be referred to as a fourth OFDM symbol hereinafter.

Fig. 7 is a schematic diagram of a transmission unit for transmission between a receiver and a transmitter. The schematic configuration shown in fig. 7 is a schematic configuration of another transmission unit in the case of the above-described relationship 3.

Fig. 7 shows two transmission units, each of which is composed of one OFDM symbol and one passband (passband) symbol as shown in fig. 7. The length of each transmission unit is the same as the length of the repetition period of the periodic impulse noise.

With L _gap7 The length of the spacing part in the transmission unit shown in fig. 7 is represented by L _data7 The length of the non-spaced portion in the transmission unit shown in fig. 7 is represented by L _pass7 The length of the pass band symbol in the transmission unit shown in fig. 7 is identified. Then L _gap7 、L _data7 、L _pass7 Lstd and rep satisfy the following relationships: l is _data7 ＝L _pass7 ＝Lstd×2 ^k /m，rep＝L _gap7 +L _data7 +L _pass7 . m is 2 ^t T is a positive integer greater than or equal to 1, t can generally take the value 1 or 2, and k is a negative integer less than or equal to-1.

For convenience of description, an OFDM symbol in the transmission unit as shown in fig. 7 will be referred to as a fifth OFDM symbol hereinafter.

Alternatively, in some embodiments, if rep-Nstd 2 ^k Greater than Nstd 2 ^k-1 Then can adopt

In the structures of the transmission units shown in fig. 3 to 6, the subcarrier spacing of the OFDM symbol is the subcarrier spacing used when determining the standard OFDM symbol. For convenience of description, the subcarrier spacing may be referred to as a standard subcarrier spacing. The standard subcarrier spacing may use SCS _std And (4) showing.

Subcarrier spacing of passband symbols SCS in the transmission unit shown in FIG. 4 _std M is, whereinThe value of m is the same as the value of m used in determining the length of the passband symbol.

In the structure of the transmission unit shown in fig. 6 or fig. 7, the subcarrier spacing of the OFDM symbol may be SCS _std ×2 ^-k Wherein the value of k is the same as the value of k used in determining the length of the non-spaced portion in the transmission unit

In the structure of the transmission unit shown in fig. 7, the subcarrier spacing of the pass band symbols is SCS _std ×2 ^-k And x m, wherein the value of m is the same as the value of m used in determining the length of the non-interval part of the transmission unit, and the value of k is the same as the value of k used in determining the length of the non-interval part of the transmission unit.

Alternatively, in some embodiments, the gap portion in the structure of the transmission unit may be a CP.

Alternatively, in other embodiments, the interval portion in the structure of the transmission unit may be a cyclic suffix.

Optionally, in other embodiments, the interval part in the structure of the transmission unit may be a silent symbol.

The spacing part is mainly used for suppressing the interference between symbols and does not participate in the demodulation of signals. Thus, whether the receiver can successfully receive and demodulate the content carried by the gap portion has no effect on the communication of useful data (e.g., traffic data and/or control data) between the receiver and the transmitter. For convenience of description, the data carried by the interval part may be referred to as useless data. As can be seen from fig. 3 to 7, the transmitter and the receiver can make all or most of the periodically occurring impulse noise partially overlap the interval for transmitting the useless data by adjusting the structure of the data unit during the communication. In other words, the traffic data and/or control data transmitted by the transmitter to the receiver are transmitted at times when there is no impulse noise or when the impulse noise is small. Thus, the influence of impulse noise on data transmission can be reduced.

The lengths of the first to fifth OFDM symbols are determined according to the length of a repetition period of the periodic impulse noise. For convenience of description, the first to fifth OFDM symbols will be collectively referred to as extraction-determined OFDM symbols hereinafter. As can be seen from fig. 3 to 7, the length of the repetition period is greater than or equal to the length of one OFDM symbol determined in advance.

The length of the OFDM symbol determined in advance may be determined according to the length of the repetition period.

For example, in a case where the length of the repetition period of the periodic impulse noise and the length of the load part of the standard OFDM symbol satisfy the above-described relationship 1, the length of the OFDM symbol determined in advance is the same as the length of the repetition period.

For another example, in a case where the length of the repetition period of the periodic impulse noise and the length of the load portion of the standard OFDM symbol satisfy the above-described relationship 1, the length of the OFDM symbol determined in advance may be equal to the difference between the length of the repetition period of the periodic impulse noise and the length of the passband symbol.

For another example, in a case where the length of the repetition period of the periodic impulse noise and the length of the load portion of the standard OFDM symbol satisfy the above-described relationship 2, the length of the OFDM symbol determined in advance may be 1/n of the length of the repetition period of the periodic impulse noise.

For another example, in a case where the length of the repetition period of the periodic impulse noise and the length of the load part of the standard OFDM symbol satisfy the above-described relationship 3, the length of the OFDM symbol determined in advance may be 2 of the length of the repetition period of the periodic impulse noise ^k Wherein k is a negative integer less than or equal to-1.

After determining the transmission unit, the transmitter may wait for a period of time before beginning to transmit the transmission unit. This can cause impulse noise to partially overlap the gap.

Fig. 8 is a diagram of the start time and latency for a transmitter to transmit a transmission unit. As shown in fig. 8, the transmitter may wait for a period of time from the peak of one impulse noise and then begin transmitting transmission units. For convenience of description, the time the transmitter waits may be made a target time. The target time is T _ d.

The length of the target time may be determined according to the length of the interval part of the transmission unit and the width of the impulse noise. In some embodiments, the length of the spacing portion is greater than or equal to the width of the impulse noise. In other embodiments, the length of the spacing portion is less than the width of the impulse noise.

Fig. 9 is a schematic diagram of determining the length of a target time. As shown in fig. 9, the length of the interval part is larger than the bandwidth of the impulse noise.

B _ down in fig. 9 represents a second time period from the peak of the impulse noise to the start boundary of the impulse noise; b _ up represents a third time period, which is a time period from a peak of the impulse noise to an end boundary of the impulse noise; t _ d represents the target time; w denotes the length of the spacer portion and the corresponding w/2 is half the length of the spacer portion. Alternatively, in some embodiments, T may represent the length of a transmission unit. Alternatively, in other embodiments, T may represent the length of the repetition period.

As shown in fig. 9, the target time may be determined according to equation 5:

t _ d ═ T-w/2+ (B _ up-B _ down)/2, equation 5.

The meaning of each symbol in equation 5 is as described above.

Equation 5 can be applied to calculate a target time when the length of the gap portion is equal to the bandwidth of the impulse noise, in addition to calculating a target time when the length of the gap portion is greater than the bandwidth of the impulse noise.

Fig. 10 is a schematic diagram of another method of determining the length of a target time. As shown in fig. 10, the length of the interval part is smaller than the bandwidth of the impulse noise.

B _ down' in fig. 10 represents a first time period from a peak of impulse noise to an upper boundary of a corresponding interval portion of the impulse noise; t _ d represents the target time; w represents the length of the spacer portion. Alternatively, in some embodiments, T may represent the length of a transmission unit. Alternatively, in other embodiments, T may represent the length of the repetition period.

As shown in fig. 10, the target time may be determined according to equation 6:

t _ d ═ T-B _ down', equation 6.

The meaning of each symbol in equation 6 is as described above.

Optionally, in a case where the length of the interval part is smaller than the width of the impulse noise, the energy of the impulse noise in the interval part is larger than the energy outside the interval part. For example, the impulse noise energy in the interval portion accounts for 85%, 90%, or 95% of the total impulse noise energy, etc.

Optionally, in some embodiments, the periodic impulse noise may be detected by both the transmitter and the receiver. In this case, the above-described work of determining the length of the OFDM symbol determined in advance and the target time may be performed by the receiver. In this case, the receiver may transmit a first indication message including information indicating the subcarrier spacing and the length of the interval part in the transmission unit to the transmitter. The subcarrier spacing is correlated to the length of the OFDM symbol in the transmission unit. The first indication message may further include first time information indicating a target time.

The transmitter may determine the transmission unit based on the subcarrier spacing.

For example, if the subcarrier spacing is the standard subcarrier spacing SCS _std Then the length of the non-spaced portion in the transmission unit may be determined to be Nstd.

As another example, if the subcarrier spacing is the standard subcarrier spacing SCS _std Then the length of the non-spaced portion in the transmission unit may be determined to be Nstd and the transmission unit may further include passband symbols. The passband symbols have a length of Nstd/m, m being 2 ^t T is a positive integer greater than or equal to 1, and t can generally have a value of 1 or 2. The length of the spacer portion is Nstd/2-Nstd/m.

As another example, if the subcarrier spacing is not the marked subcarrier spacing SCS _std Then the standard subcarrier spacing SCS can be used _std And the received subcarrier spacing indicated by the first indication message, and determining the length of the non-spacing part in the transmission unit. For example, assume that the subcarrier spacing indicated by the first indication message isSCS', and SCS ═ SCS _std ×2 ^-k Then it can be determined that the length of the non-space portion is Nstd × 2 ^k 。

The transmitter, upon determining the transmission unit, may wait for the target time after detecting a peak of the periodic impulse noise and then begin transmitting the transmission unit to the receiver.

Optionally, in other embodiments, the receiver may detect the periodic impulse noise and the transmitter may not detect the periodic impulse noise. In this case, the above-described work of determining the length of the OFDM symbol determined in advance and the target time may be performed by the receiver. In this case, the receiver may transmit a first indication message including information indicating the subcarrier spacing and the length of the interval part in the transmission unit to the transmitter. The length of the interval part and the length of the OFDM symbol in the transmission unit are correlated. The receiver may further send a second indication message to the transmitter, where the second indication message may include second time information indicating a starting time for the transmitter to send the transmission unit.

The manner of determining the transmission unit according to the first indication message by the transmitter is the same as that of the above embodiment, and for brevity, will not be described again here.

The time indicated by the second time information may be a waiting time calculated by the receiver according to the current time. For example, the second time information transmitted by the receiver to the transmitter after detecting the peak of the impulse noise may indicate the target time, or the second time information may indicate the target time and an offset value. The offset value may be an average transmission delay of a message sent by the receiver to the transmitter. As another example, the second time information transmitted by the receiver to the transmitter after detecting the start boundary of impulse noise may indicate a time from the start boundary of impulse noise to transmission of a transmission unit.

The transmitter may determine a start time for transmitting the transmission unit according to the second time information after receiving the second indication message. For example, in some embodiments, the transmitter may wait directly for the duration indicated by the second time information. For another example, in other embodiments, the transmitter may determine the start time based on the duration indicated by the second time information and an average transmission delay of the message sent by the receiver to the transmitter.

Optionally, in other embodiments, the transmitter may detect the periodic impulse noise. In this case, the above-described work of determining the structure of the transmission unit, the length of the OFDM symbol determined in advance, and the target time may be performed by the transmitter. The transmitter may begin transmitting the transmission unit after waiting a target time after detecting a peak of the periodic impulse noise. The transmitter may transmit a first indication message including information indicating a subcarrier spacing and a length of a spacing section in a transmission unit to the receiver. The length of the interval part and the length of the OFDM symbol in the transmission unit are correlated.

Alternatively, in the case where the transmitter can detect the periodic impulse noise (hereinafter referred to as first impulse noise), the transmitter may further determine that the impulse noise on the receiver side and the periodic impulse noise detected by the transmitter are the same noise before transmitting the transmission unit to the receiver according to the determined transmission unit. For example, if the impulse noise on the receiver side is also a periodic impulse noise (hereinafter referred to as a second impulse noise), and the length of the repetition period of the second periodic impulse noise is the same as the length of the repetition period of the first impulse noise and/or the width of the impulse noise of the second periodic impulse noise is the same as the width of the impulse noise of the first periodic impulse noise, it is possible to determine that the second periodic impulse noise and the first periodic impulse noise are the same periodic impulse noise.

The receiver may determine the transmission unit based on the first indication message and receive the transmission unit from the transmitter based on the determined transmission unit. The implementation manner of determining the transmission unit by the receiver according to the first indication message is the same as the implementation manner of determining the transmission unit by the receiver according to the first indication message, and for brevity, the description is omitted here.

Fig. 11 is a schematic flow chart of detecting whether the noise is periodic impulse noise. The method shown in fig. 11 may be performed by a transmitter or a receiver.

1101, it is detected whether there is impulse noise.

If it is determined that impulse noise is not present, it may be determined that periodic impulse noise is not present.

If it is determined that impulse noise is present, step 1102 may be performed.

Alternatively, in some embodiments, the determination may be based on an average power of noise for a plurality of OFDM symbols.

Detecting whether impulse noise is present may include: it is determined whether impulse noise is present based on the number of noise points within the first time period.

For example, assume that noise data of Num _ k OFDM symbols is collected within a time length LenT.

First determining the average power P of the noise in LenT _ave . Determining a noise threshold P based on the average power _th ，

Determining that the absolute value of the noise amplitude is greater than a noise threshold P _th The number Num _ p of the samples. Num _ p is the number of noise points.

In some embodiments, if

It may be determined that impulse noise is not present and otherwise, it is determined that impulse noise is present, where Th1 is a first impulse noise decision threshold, which is a preset number and fs represents the sample rate.

In other embodiments, if Num _ p is less than Th2, then it may be determined that impulse noise is not present, otherwise it is determined that impulse noise is present, where Th2 is a second impulse noise decision threshold, which is a preset number.

And 1102, extracting impulse noise.

Detect all of the windowsThe first point is regarded as the start position t1 of impulse noise, if the time difference Δ t1 between two adjacent impulse noise points is greater than ts, the former point is regarded as the end position t2 of the first impulse noise, and then other impulse noise in the window is detected in turn. Wherein

S _IN,i The position of the ith sampling point in the window is the N sampling points containing impulse noise.

1103, it is determined whether the impulse noise occurs periodically, based on the extracted impulse noise.

Optionally, in some embodiments, the determining whether the impulse noise occurs periodically according to the extracted impulse noise may include: and according to the extracted impulse noise, determining Num _ q pulse envelopes in the second time period, wherein the widths of any two pulse envelopes in the Num _ q pulse envelopes are the same. The pulse includes a width corresponding to the width of the impulse noise.

The autocorrelation parameters are determined according to the following formula:

wherein acorr _norm Representing an autocorrelation parameter, IN _i Is the sum of the amplitudes of all noise points IN the ith pulse envelope of the Num _ q pulse envelopes, IN _j Is the sum of the amplitudes of all noise points in the jth pulse envelope of Num _ q pulse envelopes, i is 1, …, Num _ q, j is 1, …, Num _ q, and i is not equal to j. If the autocorrelation parameter is determined to be greater than a preset threshold, determining that the impulse noise is periodic impulse noise, otherwise, determining that the impulse noise is not periodic impulse noise.

Fig. 12 is a communication method according to an embodiment. The method shown in fig. 12 may be implemented by the first communication device, and may also be implemented by a component (e.g., a chip or a circuit) in the first communication device.

And 1201, determining that periodic impulse noise exists in a power line between the first communication device and the second communication device, wherein the length between a starting impulse point and a last impulse point of each impulse noise with energy larger than or equal to a threshold value is k, and k is a number larger than 0.

1202, determining a transmission unit according to a repetition period of the periodic impulse noise, where the transmission unit includes an orthogonal frequency division multiplexing OFDM symbol, the OFDM symbol includes an interval part and a non-interval part, the non-interval part is used to carry traffic data and/or control data, the length of the interval part is greater than or equal to k, the length of the repetition period is equal to N times the length of the transmission unit, and N is a positive integer greater than or equal to 1.

1203, sending a first indication message to the second communication device, the first indication message being used for indicating information of a subcarrier spacing and a length of the spacing part, the subcarrier spacing being associated with the length of the OFDM symbol.

Optionally, in some embodiments, the first indication message includes first time information, where the first time information is used to indicate a target time, and the target time is a time when the second communication device transmits the transmission unit according to periodic impulse noise.

Optionally, in some embodiments, the method shown in fig. 12 further includes: and sending a second indication message to the second communication device, wherein the second indication message comprises second time information, and the second time information is used for indicating the starting time of the second communication device for sending the transmission unit.

Optionally, in some embodiments, when the length of the repetition period is greater than or equal to the length of one OFDM symbol determined in advance, the length of the OFDM symbol in the transmission unit is the length of the OFDM symbol determined in advance.

Optionally, in some embodiments, the length of the OFDM symbol determined in advance is determined according to the length of the repetition period.

Optionally, in some embodiments, the transmission unit further includes a passband symbol, and the passband symbol is used for carrying traffic data and/or control data.

Optionally, in some embodiments, before the sending the first indication information to the second communication device, the method further includes: the target time is determined according to the length of the interval part and the width of first impulse noise, wherein the first impulse noise is any one of the periodic impulse noise.

Optionally, in some embodiments, the determining the target time according to the length of the interval part and the width of the first impulse noise includes: determining the target time as a difference between the length of the transmission unit and a first time length from a peak of the first impulse noise to an upper boundary of a spaced portion corresponding to the first impulse, in case that the length of the spaced portion is smaller than the width of the first impulse noise; and under the condition that the length of the interval part is greater than or equal to the width of the first impulse noise, determining the target time according to the length of the interval part, the length of the transmission unit, a second time length and a third time length, wherein the second time length is the time length from the peak of the first impulse noise to the starting boundary of the first impulse noise, and the third time length is the time length from the peak of the first impulse noise to the ending boundary of the first impulse noise.

Optionally, in some embodiments, in a case that the length of the interval part is smaller than the width of the first impulse noise, the energy of the first impulse noise in the interval part corresponding to the first impulse is larger than the energy outside the interval part corresponding to the first impulse.

Optionally, in some embodiments, the determining the target time according to the length of the interval part, the length of the transmission unit, the second time duration and the third time duration includes: the target time is determined according to the following formula: t _ d ═ T-w/2+ (B _ up-B _ down)/2, where T _ d represents the target time, T represents the length of the transmission unit, B _ down represents the second time duration, B _ up represents the third time duration, and w represents the length of the spacing portion.

Optionally, in some embodiments, the first communication device may be a receiver and the second communication device may be a transmitter.

Optionally, in other embodiments, the first communication device may be a transmitter and the second communication device may be a receiver.

Alternatively, in some embodiments, the first communication device may periodically determine whether there is periodic impulse noise in the power line, and if so, perform the method shown in fig. 12.

Optionally, in other embodiments, the first communication device may trigger, by a preset event, to determine whether there is periodic impulse noise in the power line, and if there is periodic impulse noise, execute the method shown in fig. 12. For example, the first communication device may determine whether or not periodic impulse noise exists in the power line when a Forward Error Correction (FEC) Error rate reaches a preset condition, and execute the method shown in fig. 12 if the periodic impulse noise exists.

Specific implementation manners of the steps in fig. 12 can be referred to in the descriptions of fig. 1 to fig. 11, and for brevity, are not described again here.

Fig. 13 is a schematic structural diagram of a signal processing apparatus provided according to an embodiment of the present application. As shown in fig. 13, the signal processing apparatus 1300 includes: a processing module 1301 and a sending module 1302.

The processing module 1301 is configured to determine that periodic impulse noise exists in a power line between the first communication device and the second communication device, where in each of the periodic impulse noise, a length between a start impulse point and a last impulse point, where energy is greater than or equal to a threshold, is k, and k is a number greater than 0.

The processing module 1301 is further configured to determine a transmission unit according to a repetition period of the periodic impulse noise, where the transmission unit includes an orthogonal frequency division multiplexing OFDM symbol, the OFDM symbol includes an interval portion and a non-interval portion, the non-interval portion is used to carry traffic data and/or control data, a length of the interval portion is greater than or equal to k, a length of the repetition period is equal to N times the length of the transmission unit, and N is a positive integer greater than or equal to 1.

A sending module 1302, configured to send a first indication message to the second communication device, where the first indication message is used to indicate information of a subcarrier spacing and a length of the interval part, and the subcarrier spacing is associated with the length of the OFDM symbol.

Optionally, in some embodiments, the sending module 1302 is further configured to send a second indication message to the second communication device, where the second indication message includes second time information, and the second time information is used to indicate a starting time for the second communication device to send the transmission unit.

Optionally, in some embodiments, the processing module 1301 is further configured to determine the target time according to a length of the interval portion and a width of a first impulse noise before the first indication information is sent to the second communication device, where the first impulse noise is any one of the periodic impulse noises.

Optionally, in some embodiments, the processing module 1301 is specifically configured to determine the target time as a difference between the length of the transmission unit and a first time duration when the length of the interval portion is smaller than the width of the first impulse noise, where the first time duration is a time duration from a peak of the first impulse noise to an upper boundary of the interval portion corresponding to the first impulse; and under the condition that the length of the interval part is greater than or equal to the width of the first impulse noise, determining the target time according to the length of the interval part, the length of the transmission unit, a second time length and a third time length, wherein the second time length is the time length from the peak of the first impulse noise to the starting boundary of the first impulse noise, and the third time length is the time length from the peak of the first impulse noise to the ending boundary of the first impulse noise.

Optionally, in some embodiments, in a case that the length of the interval part is smaller than the width of the first impulse noise, the energy of the first impulse noise in the interval part corresponding to the first pulse is larger than the energy outside the interval part corresponding to the first pulse.

Optionally, in some embodiments, the processing module 1301 is specifically configured to determine the target time according to the following formula: t _ d ═ T-w/2+ (B _ up-B _ down)/2, where T _ d represents the target time, T represents the length of the transmission unit, B _ down represents the second time duration, B _ up represents the third time duration, and w represents the length of the interval part.

Fig. 14 is a block diagram of a communication device provided according to an embodiment of the present invention. As shown in fig. 14, the communication device includes a processor 1401, a memory 1402, and a transceiver 1403. The processor 1401 may be used for processing communication protocols and communication data, controlling the communication apparatus, executing software programs, processing data of the software programs, and the like. The memory 1402 is primarily used to store software programs and data.

For ease of illustration, only one memory and processor are shown in FIG. 14. In an actual communication device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be provided independently of the processor, or may be integrated with the processor, which is not limited in this embodiment.

In the embodiment of the present application, a circuit having a transceiving function may be regarded as the transceiver 1403 of the communication device, and a processor having a processing function may be regarded as the processing unit of the communication device. A transceiver may also be referred to as a transceiver unit, transceiver, transceiving means, etc. A processing unit may also be referred to as a processor, a processing board, a processing module, a processing device, or the like. Alternatively, a device for implementing a receiving function in the transceiver 1403 may be regarded as a receiving unit, and a device for implementing a transmitting function in the transceiver 1403 may be regarded as a transmitting unit, that is, the transceiver 1403 includes a receiving unit and a transmitting unit.

The processor 1401, the memory 1402 and the transceiver 1403 communicate with each other via an internal connection path, passing control and/or data signals

The methods disclosed in the embodiments of the present invention described above may be applied to the processor 1401, or may be implemented by the processor 1401. Processor 1401 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by instructions in the form of hardware integrated logic circuits or software in the processor 1401.

The processor described in the embodiments of the present application may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software modules may be located in a Random Access Memory (RAM), a flash memory, a read-only memory (ROM), a programmable ROM, an electrically erasable programmable memory, a register, or other storage medium known in the art. The storage medium is located in a memory, and a processor reads instructions in the memory and combines hardware thereof to complete the steps of the method.

Optionally, in some embodiments, the memory 1402 may store instructions for performing a method performed by a communication device, such as the method illustrated in fig. 12. The processor 1401 can execute the instructions stored in the memory 1402, and in combination with other hardware (e.g. the transceiver 1403), to complete the steps performed by the first communication device in the method shown in fig. 12, and the specific working process and beneficial effects can be referred to the description in the above embodiments.

The embodiment of the application also provides a chip, which comprises a transceiver unit and a processing unit. The transceiver unit can be an input/output circuit and a communication interface; the processing unit is a processor or a microprocessor or an integrated circuit integrated on the chip. The chip may perform the method on the first communication device side in the above method embodiments.

An embodiment of the present application further provides a computer-readable storage medium, on which instructions are stored, and when executed, the instructions perform the method on the first communication device side in the foregoing method embodiment.

Embodiments of the present application further provide a computer program product containing instructions, where the instructions, when executed, perform the method on the first communication device side in the foregoing method embodiments.

The embodiment of the application also provides a chip system. The chip heart pain comprises: logic circuitry for coupling with an input/output interface through which data is transmitted for performing the method on the first communication device side in the above method embodiments.

According to the method provided by the embodiment of the present application, the present application further provides a system, which includes the aforementioned first communication device and second communication device.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or by instructions in the form of software. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and combines hardware thereof to complete the steps of the method. To avoid repetition, it is not described in detail here.

It should be noted that the processor in the embodiments of the present application may be an integrated circuit chip having signal processing capability. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM, enhanced SDRAM, SLDRAM, Synchronous Link DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of communication, comprising:

determining a length k of each of periodic impulse noises in a power line between a first communication device and a second communication device;

determining a transmission unit according to a repetition period of the periodic impulse noise, wherein the transmission unit comprises an Orthogonal Frequency Division Multiplexing (OFDM) symbol, the OFDM symbol comprises an interval part and a non-interval part, the non-interval part is used for carrying service data and/or control data, the length of the interval part is greater than or equal to k, the length of the repetition period is equal to N times of the length of the transmission unit, and N is a positive integer greater than or equal to 1;

transmitting a first indication message to the second communication device, the first indication message being used for indicating information of the length of the interval part.

2. The method of claim 1, wherein each of the periodic impulse noises has a length k between a starting impulse point and a last impulse point with an energy greater than or equal to a threshold value.

3. The method according to claim 1 or 2, wherein the first indication information is further used for indicating a subcarrier spacing, and the subcarrier spacing is associated with a length of the OFDM symbol.

4. The method according to any of claims 1 to 3, wherein the first indication message comprises first time information, and the first time information is used for indicating a target time, and the target time is a time when the second communication device transmits the transmission unit according to the periodic impulse noise.

5. A method according to any of claims 1 to 3, characterized in that the method further comprises: and sending a second indication message to the second communication device, wherein the second indication message comprises second time information, and the second time information is used for indicating the starting time of the second communication device for sending the transmission unit.

6. The method according to any of claims 1 to 5, wherein the length of the OFDM symbol in the transmission unit is the length of one OFDM symbol determined in advance when the length of the repetition period is greater than or equal to the length of the OFDM symbol determined in advance.

7. The method of claim 6, wherein the length of the OFDM symbol determined in advance is determined according to the length of the repetition period.

8. The method according to any of claims 1 to 7, wherein the transmission unit further comprises passband symbols for carrying traffic data and/or control data.

9. The method of claim 4, wherein prior to said sending the first indication information to the second communication device, the method further comprises:

and determining the target time according to the length of the interval part and the width of first impulse noise, wherein the first impulse noise is any one of the periodic impulse noise.

10. The method of claim 9, wherein said determining the target time based on the length of the interval portion and the width of the first impulse noise comprises:

determining the target time as a difference between the length of the transmission unit and a first time length when the length of the spaced portion is less than the width of the first impulse noise, the first time length being a time length from a peak of the first impulse noise to an upper boundary of the spaced portion corresponding to the first impulse;

and under the condition that the length of the interval part is greater than or equal to the width of the first impulse noise, determining the target time according to the length of the interval part, the length of the transmission unit, a second time length and a third time length, wherein the second time length is the time length from the peak of the first impulse noise to the starting boundary of the first impulse noise, and the third time length is the time length from the peak of the first impulse noise to the ending boundary of the first impulse noise.

11. The method of claim 10, wherein in a case where a length of the interval portion is smaller than a width of the first impulse noise, an energy of the first impulse noise within the interval portion corresponding to the first pulse is larger than an energy outside the interval portion corresponding to the first pulse.

12. The method of claim 10, wherein said determining said target time based on said length of said gap portion, said length of said transmission unit, said second duration, and said third duration comprises: determining the target time according to the following formula:

T_d＝T-w/2+(B_up-B_down)/2，

wherein T _ d represents the target time, T represents the length of the transmission unit, B _ down represents the second time duration, B _ up represents the third time duration, and w represents the length of the interval part.

13. A signal processing apparatus, characterized by comprising:

the processing module is used for determining the length k of each pulse noise in the periodic pulse noise in the power line between the first communication device and the second communication device;

the processing module is further configured to determine a transmission unit according to a repetition period of the periodic impulse noise, where the transmission unit includes an orthogonal frequency division multiplexing OFDM symbol, the OFDM symbol includes an interval part and a non-interval part, the non-interval part is used to carry traffic data and/or control data, a length of the interval part is greater than or equal to k, a length of the repetition period is equal to N times the length of the transmission unit, and N is a positive integer greater than or equal to 1;

a sending module, configured to send a first indication message to the second communication device, where the first indication message is used to indicate information of the length of the interval part.

14. The method of claim 13, wherein each of the periodic impulse noises has a length k between a starting impulse point and a last impulse point with an energy greater than or equal to a threshold value.

15. The method according to claim 13 or 14, wherein the first indication information is further used for indicating a subcarrier spacing, and the subcarrier spacing is associated with a length of the OFDM symbol.

16. The apparatus according to any one of claims 13 to 15, wherein the first indication message includes first time information, the first time information is used to indicate a target time, and the target time is a time when the second communication device transmits the transmission unit according to the periodic impulse noise.

17. The apparatus according to any one of claims 13 to 15, wherein the sending module is further configured to send a second indication message to the second communication device, where the second indication message includes second time information, and the second time information is used to indicate a starting time for the second communication device to send the transmission unit.

18. The signal processing apparatus of any one of claims 13 to 17, wherein when the length of the repetition period is greater than or equal to the length of one OFDM symbol determined in advance, the length of the OFDM symbol in the transmission unit is the length of the OFDM symbol determined in advance.

19. The signal processing apparatus of claim 18, wherein the length of the OFDM symbol determined in advance is determined according to the length of the repetition period.

20. The signal processing apparatus according to any of claims 13 to 19, wherein the transmission unit further comprises passband symbols for carrying traffic data and/or control data.

21. The signal processing apparatus of claim 16, wherein the processing module is further configured to determine the target time according to a length of the interval portion and a width of a first impulse noise before the first indication information is sent to the second communication device, wherein the first impulse noise is any one of the periodic impulse noises.

22. The signal processing apparatus of claim 21, wherein the processing module is specifically configured to determine the target time as a difference between a length of the transmission unit and a first duration when the length of the interval portion is smaller than the width of the first impulse noise, where the first duration is a duration from a peak of the first impulse noise to an upper boundary of the interval portion corresponding to the first impulse;

23. The signal processing apparatus of claim 22, wherein in a case where a length of the interval part is smaller than a width of the first impulse noise, an energy of the first impulse noise within the interval part corresponding to the first pulse is larger than an energy outside the interval part corresponding to the first pulse.

24. The signal processing apparatus of claim 22, wherein the processing module is specifically configured to determine the target time according to the following formula:

T_d＝T-w/2+(B_up-B_down)/2，

25. A communication device, comprising: a processor for coupling with a memory, reading and executing instructions and/or program code in the memory, to perform the method of any of claims 1-12.

26. A chip system, comprising: logic circuitry for coupling with an input/output interface through which data is transferred to perform the method of any one of claims 1-12.

27. A computer-readable medium, characterized in that the computer-readable medium has stored program code which, when run on a computer, causes the computer to perform the method according to any one of claims 1-12.