WO2020211578A1

WO2020211578A1 - Reference signal transmission method and apparatus

Info

Publication number: WO2020211578A1
Application number: PCT/CN2020/079220
Authority: WO
Inventors: 胡远洲; 汪凡
Original assignee: 华为技术有限公司
Priority date: 2019-04-16
Filing date: 2020-03-13
Publication date: 2020-10-22
Also published as: CN111835669B; CN111835669A

Abstract

Provided in the present application are a reference signal transmission method and an apparatus, the method comprising determining a time domain continuous signal of a time domain symbol according to a Zadoff-Chu sequence, a length of the Zadoff-Chu sequence being N, and a duration of the time domain continuous signal of the time domain symbol being equal to N⋅T_s; or, if the time domain continuous signal of the time domain symbol comprises a cyclic prefix, the duration of the time domain continuous signal of the time domain symbol being equal to (N+N_cp)⋅T_s, N being a positive integer, N_cp⋅T_s being a duration of the cyclic prefix, N_cp being a positive integer, and T_s being a time unit factor; transmitting the time domain continuous signal of the time domain symbol on the time domain symbol. In the described technical solution, it is possible to generate a reference signal having a relatively low peak-to-average power ratio, thereby lowering an effect of the reference signal on signal output power, improving demodulation performance.

Description

Reference signal transmission method and device

This application claims the priority of the Chinese patent application filed with the State Intellectual Property Office on April 16, 2019, the application number is 201910304029.1, and the application name is "Reference Signal Transmission Method and Device", the entire content of which is incorporated into this application by reference .

Technical field

The embodiments of the present application relate to the field of communications, and more specifically, to a method and device for sending a reference signal.

Background technique

In a communication system, when the transmitting end sends data to the receiving end, the time domain data generated by the transmitting end can be amplified by a power amplifier (PA) and then sent to the receiving end. Among them, the output power of data with low peak to average power ratio (PAPR) after passing through the PA may be greater than the output power of data with high PAPR after passing through the PA, and the receiver performance is also better. Therefore, in order to ensure the amplification efficiency and the performance of the receiver, various low PAPR transmission waveforms are designed for time domain data in the communication system. Among them, the peak-to-average power ratio is also called the peak-to-average ratio.

Generally speaking, a reference signal (RS) is also sent with the data. In order to reduce the limitation of the PAPR of the reference signal on the output power of the PA, it is necessary to consider designing a reference signal with low PAPR.

Summary of the invention

The embodiments of the present application provide a reference signal sending method and device, which can generate a reference signal with a relatively low peak-to-average power, thereby reducing the influence of the reference signal on the signal output power and improving the demodulation performance.

In a first aspect, a reference signal transmission method is provided, including: determining a time domain continuous signal of a time domain symbol according to a ZC sequence, wherein the length of the ZC sequence is N, and the time domain continuous signal of the one time domain symbol The duration of is equal to N·T _s , or, in the case that the time domain continuous signal of the one time domain symbol includes a cyclic prefix, the duration of the time domain continuous signal of the one time domain symbol is equal to (N+N _cp )·T _s , N is a positive integer, N _cp ·T _s is the duration of the cyclic prefix, N _cp is a positive integer, and T _s is a time unit factor; when the one is sent on the one time domain symbol Time domain continuous signal of domain symbols.

The embodiment of the present application obtains a time-domain continuous signal of a time-domain symbol with a duration equal to N·T _s according to a ZC sequence of length N. The ZC sequence is a constant modulus and its peak to average power ratio (PAPR) Is 0 dB, the duration of a time-domain continuous signal of a time-domain symbol is equal to N·T _s , the process of obtaining a time-domain continuous signal of a time-domain symbol from the ZC sequence has little effect on the PAPR of the ZC sequence, so a The PAPR of the time-domain continuous signal of the time-domain symbol is approximately 0 dB or equal to 0 dB. When the continuous signal of the time-domain symbol is used as the reference signal, the PAPR of the reference signal is also approximately 0 dB or equal to 0 dB, and the PAPR of the reference signal It is basically the same as the PAPR of using a single carrier waveform to transmit data, and at the same time, the PAPR of the reference signal of the existing system is greatly reduced (for example, the PAPR of the reference signal generated by the LTE, new radio (NR) system may exceed 5 dB), thus It can increase the output power of the power amplifier and improve the demodulation performance.

It should be understood that the time-domain continuous signal of a time-domain symbol in the embodiment of the present application can be used as a reference signal of a time-domain symbol. In the embodiment of the present application, only the “time-domain continuous signal of a time-domain symbol” is obtained according to the ZC sequence. As an example, the reference signal sending method in the embodiment of the present application is also applicable to the determination of time-domain continuous signals of other time-domain symbols.

It should also be understood that, in some embodiments, the “duration of a time-domain continuous signal of a time-domain symbol” in the embodiments of the present application can also be described as “the duration of a time-domain continuous signal of a symbol” or “a time-domain continuous signal”. "Symbol length", "Symbol length", etc.

The processing operations performed on the ZC sequence in the embodiments of this application include processing the ZC sequence and indirectly processing the ZC sequence. The indirect processing of the ZC sequence can be understood as processing the output signal obtained after one or more steps of the ZC sequence. deal with.

In a possible implementation manner, the determining the time domain continuous signal of a time domain symbol according to the ZC sequence includes: filtering the ZC sequence to obtain the time domain continuous signal of the one time domain symbol, and The duration of a time-domain continuous signal of a time-domain symbol is equal to N·T _s .

In a possible implementation manner, the determining the time domain continuous signal of a time domain symbol according to the ZC sequence includes: shaping the ZC sequence to obtain the time domain continuous signal of the one time domain symbol, and The duration of a time-domain continuous signal of a time-domain symbol is equal to N·T _s .

By filtering or shaping, the ZC sequence of length N can be continuous to obtain a time domain continuous signal of time domain symbols. Filtering or shaping has little effect on the PAPR of the ZC sequence, so a time domain continuous signal of time domain symbols is obtained. The PAPR of the ZC sequence is approximately equal to that of the ZC sequence, that is, approximately 0 dB. When the continuous signal of one time domain symbol is used as a reference signal, the output power of the power amplifier can be increased when passing through the power amplifier, thereby improving the demodulation performance.

In a possible implementation manner, the determining the time domain continuous signal of a time domain symbol according to the ZC sequence includes: adding a cyclic prefix and filtering to the ZC sequence to obtain the time domain continuous signal of the one time domain symbol , The duration of the time domain continuous signal of the one time domain symbol is equal to (N+N _cp )·T _s .

In a possible implementation manner, the determining a time domain continuous signal of a time domain symbol according to the ZC sequence includes: adding a cyclic prefix and shaping to the ZC sequence to obtain the time domain continuous signal of the one time domain symbol , The duration of the time domain continuous signal of the one time domain symbol is equal to (N+N _cp )·T _s .

First add a cyclic prefix to the ZC sequence, and then filter or shape the ZC sequence after adding the cyclic prefix to make it continuous. Among them, the processing of adding the cyclic prefix has little effect on the PAPR of the ZC sequence, so after adding the cyclic prefix to the ZC sequence The PAPR of the signal is approximately equal to the PAPR of the ZC sequence, and the filtering or shaping process has little effect on the PAPR of the signal after the cyclic prefix is added to the ZC sequence. Therefore, the PAPR of the time domain continuous signal of a time domain symbol is approximately equal to the ZC sequence The PAPR is approximately 0 dB. Therefore, the PAPR of the time domain continuous signal obtained by adding a cyclic prefix, filtering processing or sequentially adding a cyclic prefix and shaping processing is very low, and then the continuous signal of a time domain symbol as a reference signal can improve the power amplifier when passing through the power amplifier. The output power can improve the demodulation performance.

It should be understood that the processing of adding a cyclic prefix in the embodiment of the present application includes copying a piece of data at the end of a data symbol to the head of the symbol (i.e., cyclic prefix), or copying a piece of data at the head of a data symbol to the beginning of the symbol. Tail (that is, cyclic suffix), or copy a part of the head and tail of a data symbol, respectively, and place them at the tail and head of the data symbol to form a cyclic structure.

In a possible implementation manner, the determining the time domain continuous signal of a time domain symbol according to the ZC sequence includes: cyclically shifting and filtering the ZC sequence to obtain the time domain continuous signal of the one time domain symbol The duration of the time domain continuous signal of the one time domain symbol is equal to N·T _s .

In a possible implementation manner, the determining the time domain continuous signal of a time domain symbol according to the ZC sequence includes: cyclically shifting and shaping the ZC sequence to obtain the time domain continuous signal of the one time domain symbol The duration of the time domain continuous signal of the one time domain symbol is equal to N·T _s .

The ZC sequence is cyclically shifted first, and then the cyclically shifted ZC sequence is filtered or shaped to make it continuous. Among them, the cyclic shift processing has almost no effect on the PAPR of the ZC sequence, so the ZC sequence is cyclically shifted The PAPR of the resulting signal is equal to the PAPR of the ZC sequence, and filtering or shaping has little effect on the PAPR of the signal after the ZC sequence is cyclically shifted. Therefore, the PAPR of a time-domain continuous signal of a time-domain symbol is approximately equal to that of the ZC sequence. PAPR is approximately 0 dB. Therefore, the PAPR of the time domain continuous signal obtained by cyclic shifting, filtering processing or cyclic shifting and shaping processing in sequence is very low. When the continuous signal of one time domain symbol is used as a reference signal through the power amplifier, the output of the power amplifier can be improved Power to improve demodulation performance.

At the same time, cyclic shift processing is performed on the ZC sequence, and multiple time-domain continuous signals (ie reference signals) of different time-domain symbols can be obtained through the same ZC sequence. For multiple terminal devices, multiple input multiple output MIMO technology is used to send data At this time, different terminals can obtain different reference signals according to the same ZC sequence, so that the channels of different terminal devices can be distinguished during demodulation at the receiving end to ensure demodulation performance.

In a possible implementation manner, the determining the time domain continuous signal of a time domain symbol according to the ZC sequence includes: sequentially performing cyclic shift, adding a cyclic prefix, and filtering on the ZC sequence to obtain the one time domain The time domain continuous signal of the symbol, and the duration of the time domain continuous signal of the one time domain symbol is equal to (N+N _cp )·T _s .

In a possible implementation manner, the determining a time domain continuous signal of a time domain symbol according to the ZC sequence includes: sequentially performing cyclic shift, adding a cyclic prefix, and shaping the ZC sequence to obtain the one time domain The time domain continuous signal of the symbol, and the duration of the time domain continuous signal of the one time domain symbol is equal to (N+N _cp )·T _s .

The ZC sequence is cyclically shifted and added with a cyclic prefix, and then the ZC sequence after the cyclic shift and the cyclic prefix is added to filter or reshape it to make it continuous. Among them, the processing of cyclic shift almost affects the PAPR of the ZC sequence. There is no effect, so the PAPR of the signal after the cyclic shift of the ZC sequence is equal to the PAPR of the ZC sequence, and the addition of cyclic prefix, filtering or shaping processing has little effect on the PAPR of the signal after the cyclic shift of the ZC sequence, so a time domain is obtained The PAPR of the time-domain continuous signal of the symbol is approximately equal to the PAPR of the ZC sequence, that is, approximately 0 dB. Therefore, the PAPR of the time domain continuous signal obtained by cyclic shifting, adding cyclic prefix, filtering processing or sequentially through cyclic shifting, adding cyclic prefix, and shaping processing is very low, and the continuous signal of one time domain symbol is used as the reference signal. The amplifier can increase the output power of the power amplifier, thereby improving the demodulation performance.

The embodiment of the application includes the cyclic shift processing of the ZC sequence, and multiple time-domain continuous signals (ie reference signals) of different time-domain symbols can be obtained through the same ZC sequence, and multiple input and multiple output are used for multiple terminal devices. When MIMO technology sends data, different terminals can obtain different reference signals according to the same ZC sequence, so that the channels of different terminal devices can be distinguished when demodulating at the receiving end to ensure demodulation performance.

In a possible implementation manner, the determining the time domain continuous signal of a time domain symbol according to the ZC sequence includes: performing inverse Fourier transform on the ZC sequence to obtain the time domain continuous signal of the one time domain symbol The duration of the time domain continuous signal of the one time domain symbol is equal to N·T _s .

Through the inverse Fourier transform, the ZC sequence of length N can be continuous to obtain a time-domain continuous signal of time-domain symbols. Since the duration of the time-domain continuous signal is equal to N·T _s , the inverse Fourier transform process has an effect on ZC The PAPR of the sequence has no effect. Therefore, the PAPR of the time-domain continuous signal of a time-domain symbol is equal to the PAPR of the ZC sequence, which is 0 dB. Therefore, the PAPR of the time-domain continuous signal obtained by the inverse Fourier transform is very high. Low, when the continuous signal of one time domain symbol passes through the power amplifier as a reference signal, the output power of the power amplifier can be increased, thereby improving the demodulation performance.

In a possible implementation manner, the determining the time domain continuous signal of a time domain symbol according to the ZC sequence includes: performing inverse Fourier transform and filtering on the ZC sequence to obtain the time domain symbol of the one time domain Domain continuous signal, the duration of the time domain continuous signal of the one time domain symbol is equal to N·T _s .

In a possible implementation manner, the determining a time-domain continuous signal of a time-domain symbol according to the ZC sequence includes: performing inverse Fourier transform and shaping on the ZC sequence to obtain the time-domain symbol of the one time-domain symbol Domain continuous signal, the duration of the time domain continuous signal of the one time domain symbol is equal to N·T _s .

In a possible implementation manner, the determining a time domain continuous signal of a time domain symbol according to the ZC sequence includes: performing inverse Fourier transform on the ZC sequence and adding a cyclic prefix to obtain the one time domain symbol The duration of the time domain continuous signal of the one time domain symbol is equal to (N+N _cp )·T _s .

In a possible implementation manner, the determining a time-domain continuous signal of a time-domain symbol according to the ZC sequence includes: sequentially performing inverse Fourier transform, adding a cyclic prefix, and filtering on the ZC sequence to obtain the one The time domain continuous signal of the time domain symbol, and the duration of the time domain continuous signal of the one time domain symbol is equal to (N+N _cp )·T _s .

In a possible implementation manner, the determining a time-domain continuous signal of a time-domain symbol according to the ZC sequence includes: sequentially performing inverse Fourier transform, adding a cyclic prefix, and shaping the ZC sequence to obtain the one The time domain continuous signal of the time domain symbol, and the duration of the time domain continuous signal of the one time domain symbol is equal to (N+N _cp )·T _s .

In the embodiment of this application, the processing of adding a cyclic prefix, filtering, and shaping has little effect on the PAPR of the output signal in the process of obtaining a time-domain continuous signal of a time-domain symbol from the ZC sequence, so a time-domain obtained through the above-mentioned processing in turn The PAPR of the time-domain continuous signal of the symbol is approximately equal to the PAPR of the ZC sequence, which is approximately 0 dB. When the continuous signal of the time-domain symbol passes through the power amplifier as a reference signal, the output power of the power amplifier can be increased, thereby improving demodulation performance.

In a possible implementation manner, the determining a time-domain continuous signal of a time-domain symbol according to the ZC sequence includes: performing inverse Fourier transform and cyclic shift on the ZC sequence to obtain the one time-domain symbol The duration of the time domain continuous signal of the one time domain symbol is equal to N·T _s .

In the embodiment of this application, the inverse Fourier transform processing and the cyclic shift processing have little or no effect on the PAPR of the output signal in the process of obtaining a time-domain continuous signal of a time-domain symbol from the ZC sequence. The PAPR of the time-domain continuous signal of the domain symbol is equal or similar to the PAPR of the ZC sequence. Therefore, when the continuous signal of the one time-domain symbol passes through the power amplifier as a reference signal, the output power of the power amplifier can be increased, thereby improving the demodulation performance.

At the same time, the embodiments of this application include cyclic shift processing, and multiple time-domain continuous signals (ie reference signals) of different time-domain symbols can be obtained through the same ZC sequence, and multiple-input multiple-output MIMO technology is adopted for multiple terminal devices. When sending data, different terminals can obtain different reference signals according to the same ZC sequence, so that the channels of different terminal devices can be distinguished during demodulation at the receiving end to ensure demodulation performance.

In a possible implementation manner, the determining a time-domain continuous signal of a time-domain symbol according to the ZC sequence includes: sequentially performing inverse Fourier transform, cyclic shift, and filtering on the ZC sequence to obtain the one The time domain continuous signal of the time domain symbol, and the duration of the time domain continuous signal of the one time domain symbol is equal to N·T _s .

In a possible implementation manner, the determining a time-domain continuous signal of a time-domain symbol according to the ZC sequence includes: sequentially performing inverse Fourier transform, cyclic shift, and shaping on the ZC sequence to obtain the one The time domain continuous signal of the time domain symbol, and the duration of the time domain continuous signal of the one time domain symbol is equal to N·T _s .

In a possible implementation manner, the determining a time-domain continuous signal of a time-domain symbol according to the ZC sequence includes: sequentially performing inverse Fourier transform, cyclic shift, and adding a cyclic prefix to the ZC sequence to obtain For the time domain continuous signal of one time domain symbol, the duration of the time domain continuous signal of the one time domain symbol is equal to (N+N _cp )·T _s .

In a possible implementation manner, the determining a time-domain continuous signal of a time-domain symbol according to the ZC sequence includes: sequentially performing inverse Fourier transform, cyclic shift, adding cyclic prefix and filtering on the ZC sequence, Obtain the time domain continuous signal of the one time domain symbol, and the duration of the time domain continuous signal of the one time domain symbol is equal to (N+N _cp )·T _s .

In a possible implementation manner, the determining a time-domain continuous signal of a time-domain symbol according to the ZC sequence includes: sequentially performing inverse Fourier transform, cyclic shift, adding cyclic prefix and shaping on the ZC sequence, Obtain the time domain continuous signal of the one time domain symbol, and the duration of the time domain continuous signal of the one time domain symbol is equal to (N+N _cp )·T _s .

In the embodiment of this application, the processing of inverse Fourier transform, cyclic shift, adding cyclic prefix, filtering, shaping, etc. has little effect on the PAPR of the output signal in the process of obtaining a time-domain continuous signal of a time-domain symbol from the ZC sequence Therefore, the PAPR of the time-domain continuous signal of a time-domain symbol obtained by the above processing is approximately equal to the PAPR of the ZC sequence, that is, approximately 0 dB. The continuous signal of the time-domain symbol can be used as a reference signal when passing through the power amplifier. Increase the output power of the power amplifier, thereby improving the demodulation performance.

In a possible implementation manner, the determining a time-domain continuous signal of a time-domain symbol according to the ZC sequence includes: performing phase rotation and inverse Fourier transform on the ZC sequence to obtain the time-domain symbol For the time domain continuous signal, the duration of the time domain continuous signal of the one time domain symbol is equal to N·T _s .

In the embodiment of this application, the phase rotation and inverse Fourier transform processing has little or no effect on the PAPR of the output signal in the process of obtaining a time domain continuous signal of a time domain symbol from the ZC sequence, so a time domain symbol is obtained The PAPR of the continuous time-domain signal is equal to or similar to the PAPR of the ZC sequence. The continuous signal of one time-domain symbol is used as a reference signal to increase the output power of the power amplifier, thereby improving the demodulation performance.

In a possible implementation manner, the determining a time domain continuous signal of a time domain symbol according to the ZC sequence includes: sequentially performing phase rotation, inverse Fourier transform, and filtering on the ZC sequence to obtain the one time The time domain continuous signal of the time domain symbol, and the duration of the time domain continuous signal of the one time domain symbol is equal to N·T _s .

In a possible implementation manner, the determining a time-domain continuous signal of a time-domain symbol according to the ZC sequence includes: sequentially performing phase rotation, inverse Fourier transform, and shaping on the ZC sequence to obtain the one time The time domain continuous signal of the time domain symbol, and the duration of the time domain continuous signal of the one time domain symbol is equal to N·T _s .

In a possible implementation manner, the determining a time-domain continuous signal of a time-domain symbol according to the ZC sequence includes: sequentially performing phase rotation, inverse Fourier transform, and adding a cyclic prefix on the ZC sequence to obtain the A time-domain continuous signal of one time-domain symbol, and the duration of the time-domain continuous signal of the one time-domain symbol is equal to (N+N _cp )·T _s .

In a possible implementation manner, the determining a time-domain continuous signal of a time-domain symbol according to the ZC sequence includes: sequentially performing phase rotation, inverse Fourier transform, adding cyclic prefix, and filtering on the ZC sequence to obtain For the time domain continuous signal of the one time domain symbol, the duration of the time domain continuous signal of the one time domain symbol is equal to (N+N _cp )·T _s .

In a possible implementation manner, the determining a time-domain continuous signal of a time-domain symbol according to the ZC sequence includes: sequentially performing phase rotation, inverse Fourier transform, adding cyclic prefix, and shaping on the ZC sequence to obtain For the time domain continuous signal of the one time domain symbol, the duration of the time domain continuous signal of the one time domain symbol is equal to (N+N _cp )·T _s .

In the embodiment of this application, the processing of phase rotation, inverse Fourier transform, cyclic prefix addition, filtering, shaping, etc., has little effect on the PAPR of the output signal in the process of obtaining a time domain continuous signal of a time domain symbol from the ZC sequence. Therefore, the PAPR of the time-domain continuous signal of a time-domain symbol obtained by the above processing is approximately equal to the PAPR of the ZC sequence, that is, approximately 0 dB. The continuous signal of the time-domain symbol is used as a reference signal and can be improved when passing through a power amplifier. The output power of the power amplifier, thereby improving the demodulation performance.

In a possible implementation manner, the method further includes: receiving cyclic shift indication information, where the cyclic shift indication information is used to indicate the cyclic shift.

In a possible implementation manner, the cyclic shift indication information is carried in the downlink control information DCI or the radio resource control RRC message.

In a second aspect, a device is provided, which is configured to implement the method described in the first aspect or any one of the possible implementation manners of the first aspect.

Optionally, the device of the second aspect may be a terminal device, or a device in a terminal device, or a device that can be matched and used with a terminal device.

Optionally, the device in the second aspect may be a network device, or a device in a network device, or a device that can be matched and used with a network device.

Optionally, the network device may be a base station.

In a third aspect, a device is provided, and the device includes a module for executing the method/operation/step/action described in the first aspect or any one of the possible implementations of the first aspect in a one-to-one correspondence. The module can be a hardware circuit, software, or hardware circuit combined with software.

Optionally, the apparatus of the third aspect may be a terminal device or a network device.

In a fourth aspect, an apparatus is provided, the apparatus includes a processor, configured to implement the foregoing first aspect or the method described in any one of the possible implementation manners of the first aspect. The apparatus may further include a memory, the memory is coupled with the processor, and the processor is configured to implement the foregoing first aspect or the method described in any one of the possible implementation manners of the first aspect. Exemplarily, the memory is used to store instructions and data, and when the processor executes the instructions stored in the memory, the method described in the first aspect or any one of the possible implementations of the first aspect can be implemented . The device may further include a communication interface for communicating with other devices. Exemplarily, the communication interface may be a transceiver, circuit, bus, module, pin, or other types of communication interfaces. Exemplarily, the device may be a terminal device, and other devices may be network devices; or, the device may be a network device, and other devices may be terminal devices.

In a fifth aspect, a computer-readable storage medium is provided, and instructions are stored in the computer-readable storage medium. When the instructions are run on a computer, the computer can execute the first aspect or any one of the first aspects. The method described in the implementation mode.

In a sixth aspect, a computer program product containing instructions is provided. When the computer program product runs on a computer, the computer executes the method described in the first aspect or any one of the possible implementations of the first aspect.

In a seventh aspect, a chip system is provided. The chip system includes a processor and may also include a memory, configured to implement the method described in the first aspect or any one of the possible implementation manners of the first aspect. The chip system can be composed of chips, or it can include chips and other discrete devices.

In an eighth aspect, an embodiment of the present application provides a communication system including the device described in the second aspect and a receiving device, and the receiving device is configured to receive the time domain sent by the device described in the second aspect Continuous signal; or the communication system includes the device described in the third aspect and a receiving device, and the receiving device is configured to receive the time domain continuous signal sent by the device described in the third aspect; or the communication system includes a fourth The device described in the aspect and the receiving device, the receiving device is configured to receive the time domain continuous signal sent by the device described in the fourth aspect.

Description of the drawings

FIG. 1 is a schematic architecture diagram of an application scenario of an embodiment of the present application;

FIG. 2 is a schematic flowchart of a method for sending a reference signal according to an embodiment of the present application;

FIG. 3 is a schematic flowchart of a reference signal sending method according to another embodiment of the present application;

4 is a schematic flow chart of a method for sending a reference signal according to an embodiment of the present application;

FIG. 5 is a schematic flow chart of a method for sending a reference signal according to another embodiment of the present application;

6 is a schematic flow chart of a method for sending a reference signal according to another embodiment of the present application;

FIG. 7 is a schematic flow chart of a method for sending a reference signal according to another embodiment of the present application;

FIG. 8 is a schematic flow chart of a method for sending a reference signal according to another embodiment of the present application;

FIG. 9 is a schematic diagram of communication resources according to an embodiment of the present application;

FIG. 10 is a schematic structural diagram of a communication device provided by an embodiment of the present application;

FIG. 11 is a schematic structural diagram of a communication device provided by an embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings.

To facilitate understanding, the technical terms involved in the technical solution of the present application will be explained below.

Symbol

A symbol generally includes a cyclic prefix (CP) and a period of time domain data. In the embodiments of this application, CP is understood in a broad sense. CP can be copying a piece of data at the end of a symbol to the head of the symbol (in this case, it can be called a cyclic prefix), or copying a piece of data at the head of a symbol To the end of the symbol (in this case, it can also be called a cyclic suffix), or a copy of the data at the head and tail of a symbol can be placed at the tail and head of the symbol to form a cyclic structure, thereby Avoid interference between signals. For example, the time-continuous signal of a symbol can be expressed as s(t), and the duration can be (N+N _cp )·T _s , t is any time on a symbol, N _cp Is the length of CP when the unit is T _s , and N is the length of the time domain data of the above period when the unit is T _s . Assuming 0≤t<(N+N _cp )·T _s , then the time domain data in s(t) with a time range of 0≤t<N _cp ·T _s can be considered as CP, then the time range in s(t) The time domain data of N _cp ·T _s ≤t<(N _cp +N)·T _s can be considered as the time domain data of the above period of time, and the duration of the time domain data of this period of time is N·T _s . T _s is a time unit factor. For example, T _s may be the time interval between two adjacent discrete data in discrete data obtained by discrete sampling of continuous time-domain output data s(t).

Exemplarily, in a long term evolution (LTE) system, for example, when N=2048, N _cp is 160 or 144, and T _s is 1/(15000×2048) second, then a symbol consists of a cyclic prefix and a duration It consists of time domain data with a time of approximately 66.7 microseconds.

Exemplarily, in a new radio (NR) system, as described in the 3GPP TS 38.211 protocol, the sub-carrier interval can be configured by the parameter μ, and the corresponding sub-carrier interval is Δf = 2 ^μ · 15 kHz, where μ can be It is an integer such as 0, 1, 2, 3, and 4. The parameter corresponding to the time unit in NR is T _c , T _c =1/(Δf _max ·N _f ); where Δf _max =480·10 ³ Hz and N _f =4096. T _s =1/(Δf _ref ·N _f,ref ), where Δf _ref =15·10 ³ Hz and N _f,ref =2048. The relationship between T _c and T _s is κ=T _s /T _c =64. The duration of a symbol is

The duration of the corresponding period of time domain data is

The duration of the cyclic prefix is

p is the index of the symbol.

The length of the cyclic prefix when using the normal cyclic prefix (i.e.

) Is 144κ·2 ^-μ +16κ or 144κ·2 ^-μ .

In some embodiments, one symbol may include time-domain data for a period of time without including a cyclic prefix or cyclic suffix. For example, if the time-domain continuous signal of one symbol can be expressed as s(t), its duration is N·T _s , where N is the length of the time-domain data for the aforementioned period of time.

A symbol can be contained in a time unit, and the time unit can contain several symbols. The time unit may be a mini-slot, a slot, a subframe, or a radio frame, etc., which is not limited in this embodiment of the application. For example, one time slot in the LTE system contains 7 or 6 symbols; one time slot in the new radio (NR) system contains 14 or 12 symbols. In the embodiments of the present application, "a symbol" can also be expressed as "a time domain symbol" or "a data symbol", and "a time domain continuous signal of one symbol" can be expressed as "a time domain continuous signal of a time domain symbol". Signal", for the convenience of description, the following unified expressions are "a time domain symbol" and "a time domain continuous signal of a time domain symbol".

It should be noted that when the inverse Fourier transform is used in the process of generating a time continuous signal of a time domain symbol, the time domain symbol can be called orthogonal frequency division multiplexing (orthogonal frequency division multiplexing). division multiplexing, OFDM) symbols, that is, OFDM symbols. For example, in the NR standard protocol TS 38.211 V15.3.0 or other versions of TS 38.211 (for example, TS 38.211 V15.2.0 or future protocol versions), a time slot contains

Consecutive OFDM symbols. among them,

It is a positive integer, such as 1, 2, 4, 6, 7, 12, or 14, etc.

It should also be noted that, in the embodiment of the present application, a time-domain continuous signal of a time-domain symbol can be understood as a signal sent by a transmitting end on a time-domain symbol.

Resource element (resource element, RE)

The resource unit is the smallest physical resource, and generally the smallest resource that carries data. A resource unit may correspond to a subcarrier in the frequency domain, and correspond to a time domain symbol in the time domain (that is, be located in a time domain symbol). In other words, the location of the resource unit can be determined by the index of the time domain symbol and the index of the subcarrier. An RE can generally carry one complex number of data. For example, for an OFDM waveform, one RE carries one modulation data; for a single-carrier frequency-division multiple access (SC-FDMA) waveform, one RE carries It is one of the output data obtained by Fourier transformation of modulation data.

It should be understood that the technical solutions in the embodiments of the present application can be applied to various communication systems, including but not limited to long term evolution (LTE) systems, advanced long term evolution (LTE-A) systems, Five-generation (5th-generation, 5G) mobile communication system, narrowband internet of things (NB-IoT) system, enhanced machine-type communication (eMTC) system or LTE-machine-to-machine (LTE-machine-to-machine, LTE-M) system, etc. Among them, the 5G mobile communication system can also be referred to as a new radio (NR) system.

It should also be understood that the technical solutions of the embodiments of the present application can be applied to various access technologies when applied in a communication system. For example, it can be applied to orthogonal multiple access (orthogonal multiple access, OMA) technology or non-orthogonal multiple access (non-orthogonal multiple access, NOMA) technology. When applied to orthogonal multiple access technology, it can be applied to orthogonal frequency division multiple access (orthogonal frequency division multiple access, OFDMA) or single carrier frequency division multiple access (single carrier frequency division multiple access, SC-FDMA) and other technologies , The embodiment of this application does not limit it. When applied to non-orthogonal multiple access technology, it can be applied to sparse code multiple access (SCMA), multi-user shared access (MUSA), pattern split multiple access Access (pattern division multiple access, PDMA), interleave-grid multiple access (IGMA), resource spreading multiple access (RSMA), non-orthogonal coded multiple access Technologies such as non-orthogonal coded multiple access (NCMA) or non-orthogonal coded access (NOCA) are not limited in the embodiment of the present application.

It should also be understood that the technical solutions of the embodiments of the present application can be applied to various scheduling types when applied in a communication system. For example, it can be applied to authorization-based scheduling or authorization-free scheduling. When applied to authorization-based scheduling, the network device can send scheduling information to the terminal device through dynamic signaling, the scheduling information carries transmission parameters, and the network device and the terminal device perform data transmission based on the transmission parameters. When applied to authorization-free scheduling, scheduling information can be pre-configured, or network equipment can send scheduling information to terminal equipment through semi-static signaling. The scheduling information carries transmission parameters, and network equipment and terminal equipment perform data transmission based on the transmission parameters . Wherein, authorization-free scheduling may also be referred to as non-dynamic scheduling (without dynamic scheduling), without dynamic grant (without dynamic grant), or other names, which are not specifically limited in the embodiment of this application.

The technical solutions of the embodiments of the present application can be applied to wireless communication between communication devices. Communication devices can use air interface resources for wireless communication. Among them, the communication device may include a network device and a terminal device, and the network device may also be referred to as a network side device. The air interface resources may include at least one of time domain resources, frequency domain resources, code resources, and space resources. In the embodiments of the present application, at least one can also be described as one or more, and the multiple can be two, three, four or more, which is not limited in this application. The wireless communication between communication devices may include: wireless communication between a network device and a terminal device, wireless communication between a network device and a network device, and wireless communication between a terminal device and a terminal device.

It should be noted that in the embodiments of this application, the term "wireless communication" can also be referred to as "communication", and the term "communication" can also be described as "data transmission", "signal transmission", "information transmission" or "transmission". "Wait. In the embodiment of the present application, transmission may include sending or receiving. Exemplarily, the transmission may be uplink transmission, for example, the terminal device may send a signal to the network device; the transmission may also be downlink transmission, for example, the network device may send a signal to the terminal device.

Fig. 1 shows a schematic diagram of an application scenario of an embodiment of the present application. As shown in FIG. 1, the communication device may include a network device 110 and a terminal device 120.

It should be understood that FIG. 1 only takes the wireless communication between the network device 110 and the terminal device 120 as an example for description. In specific implementation, the technical solution of the present application can also be applied to the wireless communication between the network device 110 and other network devices. , Can also be applied to wireless communication between the terminal device 120 and other terminal devices.

The network device 110 involved in the embodiment of the present application includes a base station (BS). The base station may be a device that is deployed in a wireless access network and can communicate with terminal devices wirelessly. Therefore, the base station may sometimes be called an access network. Device or access network node. It is understandable that in systems using different wireless access technologies, the names of devices with base station functions may be different. For ease of description, in this embodiment of the application, devices that provide wireless access functions for terminal devices are collectively referred to as base stations. Base stations may come in many forms, such as macro base stations, micro base stations, relay stations, and access points. Exemplarily, the base station involved in the embodiment of the present application may be the next generation node base station (gNB or gNodeB) in 5G or the evolved node B (evolved node B, eNB or eNodeB) in LTE, where The base station in 5G can also be called a transmission reception point (TRP). In the embodiments of the present application, the device used to implement the function of the network device may be a network device, or a device capable of supporting the network device to implement the function, such as a chip system. In the technical solution of the embodiment of the present application, the device used to implement the function of the network device is the network device, and the network device is the base station as an example to describe the technical solution provided by the embodiment of the present application.

The terminal device 120 involved in the embodiments of the present application may be called a terminal. The terminal may be a device with a wireless transceiver function. The terminal may be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; or on the water. (Such as ships, etc.); can also be deployed in the air (such as aircraft, balloons and satellites, etc.). The terminal device 120 may also be referred to as user equipment (UE), access terminal, terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless network equipment, User agent or user device. Among them, the UE may include handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices, unmanned aerial vehicles or terminal devices in the Internet of Things, Internet of Vehicles, and terminal devices in any form in the future network. Exemplarily, the UE may be a mobile phone, a tablet computer, or a computer with wireless transceiver function. The terminal device 120 may also be a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in telemedicine, Wireless terminals in smart grids, wireless terminals in smart cities, wireless terminals in smart homes, and so on. In the embodiments of the present application, the device for implementing the function of the terminal may be a terminal, or a device capable of supporting the terminal to implement the function, such as a chip system. In the embodiments of the present application, the chip system may be composed of chips, or may include chips and other discrete devices. In the technical solution of the embodiment of the present application, the device used to implement the function of the terminal is the terminal, and the terminal is the UE as an example to describe the technical solution provided by the embodiment of the present application.

Taking Figure 1 as an example, when the network device 110 communicates with the terminal device 120 wirelessly, in order to ensure that the receiving end in a certain area can receive a satisfactory signal level without interfering with the communication of adjacent channels, it is generally required to be at the transmitting end A power amplifier (PA) is provided on one side, and the PA amplifies the power of the signal sent by the transmitting end to meet the requirements of the transmission power (that is, the output power). Here, the sending end may be a network device and the receiving end may be a terminal device; or the sending end may be a terminal device and the receiving end may be a network device.

For PA, the signal before amplification can be called the input signal of the PA, and the signal after amplification is the output signal of the PA. PA's amplification function of input signal includes linear region and non-linear region. In the linear region, the power ratio of the output signal of the PA to the input signal is constant, that is, the amplification gain of the PA is constant, and the phase of the input signal and the output signal are the same or different by a fixed phase value. In the non-linear region, the amplification gain of the PA will decrease with the increase of the input signal power, and the PA amplification function will be distorted, and the phase change between the input signal and the output signal is also nonlinear. In other words, the PA may change the nature of the signal to be sent in the non-linear region, which will affect the demodulation performance of the signal at the receiving end. Therefore, the operating point of the PA needs to be in a more linear region.

Generally, the peak-to-average power ratio (PAPR) of the input signal waveform can affect the output power of the input signal after passing through the PA. After a waveform with a lower PAPR passes through the PA, the output power is larger than a waveform with a higher PAPR passes through the PA, the demodulation performance is improved, and the performance of the receiver is also better.

The single carrier waveform can send modulated data in the time domain and can provide very low PAPR. For example, for the uplink single carrier quadrature amplitude modulation (SC-QAM) waveform, when it is used to send data, the PAPR of the generated time domain data is about 0 dB. If the uplink single-carrier quadrature amplitude modulation waveform is filtered, such as time-domain filtering, the PAPR of the generated time-domain data is improved, but still relatively low, for example, the PAPR is increased to about 1 dB.

However, in a complete data transmission process, in addition to sending data, it may also be necessary to send a reference signal (RS). The reference signal may also be referred to as a pilot (pilot) signal or a demodulation reference signal (DMRS). When the reference signal is used as a DMRS, it is sent together with the data and is a signal known by both the sending end and the receiving end, and is mainly used to assist the receiving end in data demodulation. For example, in the LTE system, in the uplink communication process, the data adopts single carrier frequency division multiple access (SC-FDMA) waveforms, and the reference signal adopts the Zadoff-Chu sequence (also called the ZC sequence).

As mentioned above, the single carrier waveform can provide very low PAPR when it is used for data transmission. At this time, if the pilot sequence of the demodulation reference signal (ie Zadoff-Chu (ZC) sequence) has a higher PAPR, the reference signal and data When sent together, the reference signal will limit the output power of the PA and affect the demodulation performance. Therefore, it is necessary to provide a low PAPR reference signal.

The embodiment of the present application provides a method for sending a reference signal, which can generate a reference signal with a low PAPR, for example, a reference signal with a PAPR of about 0dB. The technical solution of the embodiment of the present application will be described in detail below with reference to FIG. 2.

It should be noted that the reference signal generated according to the reference signal sending method of the embodiment of the present application can be used as a demodulation reference signal of a single carrier waveform, and can also be used as a demodulation reference signal of other waveforms. For the convenience of description, this application The embodiment uses a single carrier waveform to send data, and the reference signal is a demodulation reference signal with a single carrier waveform as an example for description. However, as mentioned above, the reference signal generated according to the method of the present application can also be used for reference signals of other waveforms or sent together with other waveform data. The reference signal sending method provided in the embodiments of this application can also be applied to other types of reference signals besides demodulation reference signals, such as channel state information-reference signal (CSI-RS), channel sounding reference Signal (sounding reference signal, SRS), etc. In the embodiment of the present application, the value of the reference signal is a ZC sequence as an example. The value of the reference signal may also be other sequences, for example, other sequences that are constant modulus in the time domain and/or frequency domain. When the value of the reference signal is another sequence, the ZC sequence in the method provided in the embodiment of the present application is replaced with the other sequence.

FIG. 2 shows a schematic flowchart of a method for sending a reference signal according to an embodiment of the present application. The method in Figure 2 can be executed by the sender. The sending end may be, for example, the network device 110 or the terminal device 120 shown in FIG. 1. The method includes step S210 to step S220.

In step S210, the transmitting end determines a time domain continuous signal of a time domain symbol according to the ZC sequence, where the length of the ZC sequence is N, and the duration of the time domain continuous signal of the one time domain symbol is equal to N·T _s Or, in the case that the time domain continuous signal of the one time domain symbol includes a cyclic prefix, the duration of the time domain continuous signal of the one time domain symbol is equal to (N+N _cp )·T _s . N is a positive integer, N _cp ·T _s is the duration of the cyclic prefix, and N _cp is a positive integer. The cyclic prefix in the embodiments of this application is understood in a broad sense and is understood as a guard interval, that is, not only includes copying the signal from the tail of the time domain symbol to the head, but also includes copying the signal from the head of the time domain symbol to the tail, or includes A copy of the head and tail of the time domain symbol are respectively placed at the tail and head of the time domain symbol. The case where the signal at the head of the time domain symbol is copied to the tail can also be referred to as a cyclic suffix (CS).

T _s is a time unit factor. For example, T _s may be the time interval between two adjacent discrete data in discrete data obtained by discretely sampling a time domain continuous signal of a time domain symbol. In other words, T _s can be the time interval between two discretely sampled time-domain data within one time-domain symbol.

When the cyclic prefix is not included in a time domain symbol, from a discrete point of view, the length of a time domain symbol is N, that is, the number of discrete sampling points in a time domain symbol is N, and N is a positive integer; from a continuous perspective Look, the length of a time domain symbol is N·T _s . In other words, the duration of a time domain symbol is N·T _s , or the duration of a time domain continuous signal of a time domain symbol is N·T _s . When the one time domain symbol includes a cyclic prefix of length N _cp , from a discrete point of view, the length of this time domain symbol is N+N _cp ; from a continuous point of view, the length of this time domain symbol is (N+N _cp )·T _s , or the duration of a time domain symbol is (N+N _cp )·T _s , or the duration of the time domain continuous signal of the time domain symbol is (N+N _cp )·T _s .

In the time unit used to execute step 210 or in the time unit used to execute step 210, the sending end determines a ZC sequence of length N.

In the following, x _q represents the ZC sequence, and the ZC sequence x _q can be determined in the following manner.

When N is an even number, the ZC sequence x _q can be determined by the following formula:

When N is an odd number, the ZC sequence x _q can be determined by the following formula:

Among them, x _q (n) is the nth value of x _q ; N is the length of the ZC sequence, and N is a positive integer; q is the root of the ZC sequence, q is an integer, and q and N are relatively prime; j is an imaginary unit , The square of j is equal to -1; π is the pi.

The ZC sequence x _q includes N elements, such as x _q (0), x _q (1), x _q (2)...x _q (N-1). n is the index of each element of the ZC sequence, for example, n=1 represents x _q (1) in the ZC sequence, and n=N-1 represents x _q (N-1) in the ZC sequence.

The length N of the ZC sequence may be a value predefined in the communication protocol, and the root q may be calculated or selected by N according to a predefined formula. For example, the length N of the ZC sequence is an even number, and the root q can be an odd positive integer not exceeding N.

It should be understood that the root q of the ZC sequence and the length N of the ZC sequence are relatively prime, that is, the greatest common divisor of the root q of the ZC sequence and the length N of the ZC sequence is 1. Exemplarily, when the length N of the ZC sequence is an even number, the value of the root q may be an odd positive integer not exceeding N.

It should be understood that the ZC sequence determined in the foregoing manner is in a discrete form, and the ZC sequence is constant modulus (that is, the modulus or amplitude of each element in the ZC sequence is the same), and the PAPR of the ZC sequence is 0 dB. It should be understood that the deformation formula of the ZC sequence generation formula and other ZC sequence generation methods can also be applied to the method described in the embodiment of this application. In addition, the ZC sequence in the embodiment of this application can also be pre-stored in the sending end, and the sending end sends reference It reads the pre-stored ZC sequence when signal, no need to calculate by formula.

It should be noted that the signal sent by the transmitter on the time domain symbol after the ZC sequence undergoes one or more processing operations in this embodiment of the application can be called a time domain continuous signal. For the convenience of description, the embodiment of this application only uses The determination of a time-domain continuous signal of a time-domain symbol is described as an example. For other time-domain symbols, the method in the embodiment of the present application is also applicable.

There are many ways for the transmitter to determine a time domain continuous signal of a time domain symbol according to the ZC sequence. In the embodiment of this application, x _{time is used to} represent the time domain continuous signal sent by the transmitter on the time domain symbol. When used to determine the time domain continuous signal of a time domain symbol, x _time represents the time domain of a time domain symbol. Continuous signal.

The transmitting end can perform continuous processing on the ZC sequence to obtain a time domain continuous signal of a time domain symbol.

method one

As an example, the continuous processing of the ZC sequence by the transmitter is filtering or shaping. In other words, the transmitter can filter or reshape the ZC sequence in the time domain to obtain a time-domain continuous signal with time-domain symbols. The duration of the time domain continuous signal of this one time domain symbol is equal to N·T _s . Filtering the ZC sequence can be a linear convolution operation between the ZC sequence and the filter coefficients, or other filtering implementations. The filter can be a root raised cosine (RRC) filter, root raised cosine (square root raised cosine, SRRC) filters and other filters.

In this example, what is sent in the time domain is a time domain continuous signal x _time continuous form of a time domain symbol.

As a possible implementation, the ZC sequence can be filtered to obtain a continuous time-domain continuous signal x _time , where filtering can be understood as time-domain filtering, and the time-domain continuous signal x _time can be expressed as:

Among them, x _time (t) represents the data at the t-th time in x _time ; f represents the coefficient of the filter,

Represents the first in f

Filter coefficients at times;

Is the offset factor of the filter. The offset factor may be a predefined fixed value or indicated by signaling; T _s is a time unit factor. The value range of t can be t _start ≤ t<t _end , t _start , t, and t _end are all real numbers, and t _end -t _start =N·T _s , for example, t _start =0, t _end =N·T _s . The duration of the filter coefficient is N _filter ·T _s , where N _filter is a positive integer, N _filter is the number of filter coefficients for discrete sampling, and the value range of t'in the filter coefficient f(t') can be 0≤ t'<N _filter ·T _s . Optionally,

Fixed to 0, that is, the above formula (3) does not include

item.

x _q (i) represents the i-th value in the ZC sequence x _q , i is an integer, and the value range of i is determined by the value range of time t and the filter coefficient f. For example, suppose

N _filter ·T _s ＝4T _s , 0≤t<N·T _s , then when t=0, the value range of i is -4<i≤0;

N _filter ·T _s =4T _s , 0≤t<N·T _s , then when t=(N-1)·T _s , the value range of i is N-1<i≤N+3. The time domain continuous signal x _time is located in a time domain symbol. When p is used to represent the index of the time domain symbol, the corresponding time domain continuous signal x _time can be expressed as

That is, the time domain continuous signal of a time domain symbol is

The ZC sequence x _q corresponding to this time domain symbol can be expressed as

which is

For ease of description, in the embodiments of the present application, x _{time is used to} represent a time-domain continuous signal. When the time-domain continuous signal is located within a time-domain symbol, x _time is also used to represent a time-domain symbol of the time continuous signal. In the embodiments of the present application, the time-domain continuous signal determined by the transmitting end according to the ZC sequence is described by taking a time-domain continuous signal of one time domain symbol as an example.

It should be noted that for the time domain filtering process of the time domain symbol p, when i<0, the time domain filtering input data

The value of is the N+ith data in the input data whose length is N of the previous time domain symbol (for example, the time domain symbol p-1). That is to say, when i<0, assuming that the input data of the previous time domain symbol is expressed as x ^p-1 (i'), i'=0,1,2,...,N-1, then

When i≥N, time domain filter input data

The value of is the iNth data in the input data of length N of the latter time domain symbol (immediate domain symbol p+1). That is to say, when i≥N, assuming that the input data of the next time domain symbol is represented as x ^p+1 (i'), i'=0,1,2,...,N-1, then

As an example and not a limitation, the foregoing processing procedure of filtering the ZC sequence to obtain a continuous time-domain continuous signal x _time is shown in steps S410 and S430 in FIG. 4.

After the ZC sequence x _{q is} generated in step S410, the filtering of step S430 is performed, wherein the input data of the time domain filtering is the ZC sequence x _q , and the output data after the filtering is the continuous time domain signal x _time .

As another possible implementation manner, the ZC sequence can be shaped to obtain a continuous time-domain continuous signal x _time .

Exemplarily, the time domain continuous signal x _time can be expressed as:

x _time (t)=x _q (n)·g(tn×T _s ), n=0,1,2,...,N-1 (4)

Among them, x _time (t) is the data at the t-th time in x _time , and the value range of t can be t ₁ ≤t≤t ₂ , or t ₁ ≤t<t ₂ , or t ₁ <t≤t ₂ . Both t ₁ and t ₂ are real numbers, and t ₂ -t ₁ =T _s . For example, the values of t ₁ and t ₂ can be t ₁ =(n-1)·T _s , t ₂ =n·T _s ; or t ₁ =n·T _s , t ₂ =(n+1)· T _s . T _s is a time unit factor. For example, T _s may be the time interval between two adjacent discrete data in discrete data obtained by discrete sampling of x _time (t). g(t) is a shaping function, g(t) may be predefined, or may be indicated by a network side device such as a base station through signaling. x _q (n) is the nth value of the ZC sequence x _q .

For example, when t ₁ =n·T _s and t ₂ =(n+1)·T _s , g(t) can be expressed as:

Assuming that n·T _s ≤t<(n+1)·T _s , and taking discrete sampling of x _time (t) with t=n·T _s , we can get

x _time (n·T _s )=x _q (n), n=0,1,2,...,N-1 (6)

Therefore, it can be seen from the above formula that the output data x _time (n·T _s ) after discrete sampling of x _time (t) is consistent with the ZC sequence x _q (n).

As an example and not a limitation, the above-mentioned processing of shaping the ZC sequence to obtain a continuous time-domain continuous signal x _time is shown in steps S410 and S430 in FIG. 4, wherein the filtering operation in step S430 is replaced by shaping, and the details will not be described in detail. .

In the two possible implementations listed above, when N _filter =1 in formula (3),

When, the above filtering operation is equivalent to a certain shaping operation, as shown in equation (4).

Filtering or shaping has little effect on PAPR. Therefore, if the ZC sequence is filtered or shaped, the PAPR of the data obtained in the time domain is approximately 0 dB.

As another example, the continuous processing of the ZC sequence by the transmitting end may include adding cyclic prefix and filtering processing, or the continuous processing of the ZC sequence by the transmitting end may include adding cyclic prefix and shaping processing, in other words, the transmitting end The ZC sequence can be processed by adding a cyclic prefix and time-domain filtering in sequence to obtain a continuous time-domain continuous signal, or the transmitting end can sequentially perform a cyclic prefix adding and a shaping process on the ZC sequence to obtain a time-domain continuous signal. The duration of a time-domain continuous signal of a time-domain symbol obtained by adding cyclic prefix processing is equal to (N+N _cp )·T _s .

As a possible implementation, the transmitter can add a cyclic prefix and filter to the ZC sequence to obtain a time domain continuous signal of a time domain symbol, and the duration of a time domain continuous signal of a time domain symbol is equal to (N+N _cp ) · T _s . Here, for the convenience of description, x _cp can be used to represent the data obtained after adding a cyclic prefix to the ZC sequence, and x _time can be used to represent the time-domain continuous signal obtained after filtering x _cp .

For example, in the operation of adding a cyclic prefix, the data x _cp obtained after adding the cyclic prefix to the ZC sequence x _q can be expressed by the following formula:

x _cp (n')=x _q ((n'+offset)mod N), n'=0,1,2,...,N+N _cp -1 (7)

Among them, x _cp (n') is the n'th value of x _cp ; mod represents the modulo operation; _n'is the index of the element in the sequence x _cp ; N is the length of the ZC sequence x _q ; offset is the offset, offset is an integer, offset can be indicated by high-level signaling such as DCI or RRC, or can be a predefined fixed value, for example, offset is -N _cp ; N _cp is the length of the added cyclic prefix, N _cp is an integer, and N _cp The value can be determined by the length of the ZC sequence and the sequence number of the time domain symbol used to transmit the ZC sequence.

In the embodiment of the present application, by way of example, when the length N of the ZC sequence is 2048, and a slot contains 14 time domain symbols, the time domain symbol for sending the ZC sequence is the time domain symbol #0 or the time domain symbol in a time slot. Domain symbol #7, the value of N _cp is 160; if the time domain symbol of the ZC sequence sent is a time domain symbol other than time domain symbol #0 and time domain symbol #7 in a time slot, then N _cp The value is 144. Optionally, for the introduction of the value of N _cp , refer to the introduction of the LTE standard protocol 36.211, or refer to the introduction of the NR standard protocol 38.211.

In the embodiment of the present application, for example, the offset offset can be fixed to -N _cp , then the above formula (7) can be equivalent to adding the last N _cp data of the ZC sequence x _q to the front position of x _q As a cyclic prefix, the output data x _cp after adding the cyclic prefix is obtained. Of course, the offset can also be fixed to other values, and the data of other parts of the ZC sequence x _{q is} copied as the cyclic prefix or cyclic suffix.

In the process of filtering (which can be time domain filtering), the input data of the time domain filtering process is the data x _cp obtained by adding the cyclic prefix operation. In this process, formula (3) can be used to express the time domain continuous signal x _time . It should be noted that when applying formula (3), the value range of t can be t _start ≤t<t _end , t _start , t, and t _end are all real numbers, and t _end -t _start = (N _cp +N) ·T _s , the values of other parameters can refer to the values of similar parameters in formula (3).

As an example and not a limitation, the above-mentioned processing of adding a cyclic prefix and filtering the ZC sequence to obtain a continuous time-domain continuous signal x _time is shown in steps S410, S420, and S430 in FIG. 4.

Step S410 generates a ZC sequence x _q, in step S420 is added to the ZC sequence x _q cyclic prefix to obtain the output data x _cp, filtering x _cp In step S430, where the input data is temporal filtering a ZC sequence by addition cycles The output data obtained after the prefix is x _cp , and the output data after filtering is a continuous signal x _{time in the time} domain.

As another possible implementation, the transmitter can add a cyclic prefix and shaping to the ZC sequence to obtain a time-domain continuous signal of a time-domain symbol. The duration of a time-domain continuous signal of a time-domain symbol is equal to (N+N _cp )·T _s . Here, for the convenience of description, x _cp can be used to represent the data obtained after adding a cyclic prefix to the ZC sequence, and x _time can be used to represent the time-domain continuous signal obtained after shaping x _cp .

Exemplarily, in the process of adding a cyclic prefix to the ZC sequence, the data x _cp obtained after adding the cyclic prefix to the ZC sequence x _q can be expressed by formula (7), and the values of the corresponding parameters are also shown in formula (7) Related description.

In the shaping process, the input data of the shaping process is the data x _cp obtained by adding a cyclic prefix. In this process, the time domain continuous signal x _time can be expressed as:

x _time (t)=x _cp (n')·g(t-n'×T _s ), n'=0,1,2,...,N+N _cp -1 (8)

Among them, x _time (t) is the data at the t-th time in x _time , and the value range of t can be t ₁ ≤t≤t ₂ , or t ₁ ≤t<t ₂ , or t ₁ <t≤t ₂ . Both t ₁ and t ₂ are real numbers, and t ₂ -t ₁ =T _s . For example, the values of t ₁ and t ₂ can be t ₁ =(n'-1)·T _s , t ₂ =n'·T _s ; or t ₁ =n'·T _s , t ₂ =(n' +1)·T _s . T _s is a time unit factor. For example, T _s may be the time interval between two adjacent discrete data in discrete data obtained by discrete sampling of x _time (t). g(t) is a shaping function, g(t) may be predefined, or may be indicated by a network side device such as a base station through signaling. x _cp (n') is the n'th value of data x _cp obtained after the ZC sequence is processed by adding a cyclic prefix.

Similar to the description of formula (8) above, when the value range of t is a certain value, the output data x _time (n'T _s ) after discrete sampling of x _time (t) with t=n'T _s is x _cp (n') is consistent.

As an example and not a limitation, the above-mentioned processing of adding a cyclic prefix and shaping the ZC sequence to obtain a continuous time-domain continuous signal x _time is shown in steps S410, S420, and S430 in FIG. 4, wherein the filtering operation of step S430 Replaced with plastic surgery, the details will not be detailed.

The process of adding a cyclic prefix has little effect on PAPR. Therefore, the PAPR of the data obtained by adding the cyclic prefix to the ZC sequence is approximately 0 dB in the time domain.

In summary, since the PAPR of the ZC sequence is 0 dB, the addition of cyclic prefix operations, filtering operations or shaping operations has little effect on the PAPR of the ZC sequence. Therefore, the time domain of a time domain symbol obtained by the above several possible implementations The PAPR of the continuous signal x _time can also be approximately equal to the PAPR of the ZC sequence, that is, approximately 0 dB. If the continuous signal of a time domain symbol is used as the reference signal, the PAPR of the reference signal is basically the same as the PAPR of the single carrier waveform to send data, and the PAPR of the reference signal of the existing system is greatly reduced (such as LTE, NR system generation The PAPR of the reference signal may exceed 5 dB). Further, when the reference signal with reduced PAPR passes through the power amplifier, the output power of the power amplifier can be increased, thereby improving the demodulation performance.

Way two

As another example, the continuity processing performed on the ZC sequence by the transmitting end may include cyclic shift and filtering processing, or the continuity processing performed on the ZC sequence by the transmitting end may include cyclic shift and shaping processing. In other words, the transmitting end can cyclically shift and filter the ZC sequence to obtain a continuous time-domain continuous signal, or the transmitting end can perform cyclic shift and shaping processing on the ZC sequence to obtain a continuous time-domain continuous signal. The duration of a time-domain continuous signal of a time-domain symbol is equal to N·T _s .

As a possible implementation, the transmitting end may perform cyclic shift and filtering on the ZC sequence to obtain a time domain continuous signal of a time domain symbol, and the duration of the time domain continuous signal of a time domain symbol is equal to N·T _s . Here, for the convenience of description, x _cs can be used to represent the data obtained after the ZC sequence is cyclically shifted, and x _time can be used to represent the time domain continuous signal obtained after filtering the x _cs .

For example, in the cyclic shift operation, the sender can use the ZC sequence x _q

Cyclic shift,

Is an integer,

It can be positive or negative. If

Is a positive number, it can be considered to shift the ZC sequence x _{q to the} left

If

Is a negative number, it can be considered that the ZC sequence x _{q is} cyclically shifted to the right by the absolute value

Exemplarily, in the cyclic shift operation, the output data x _cs obtained by cyclically shifting the ZC sequence x _q can be expressed as:

Among them, x _cs (n) is the nth value of x _cs ,

Is the value of the cyclic shift, N is the length of the ZC sequence, n is the index of the element in the ZC sequence, and mod is the modulo operation.

Cyclic shift value

It can be indicated by dynamic signaling, such as downlink control information (DCI); it can also be indicated by high-layer signaling, such as radio resource control (RRC) information, system messages, broadcast messages, or media access control (media access control, MAC) control element (CE); it can also be determined by a formula, for example:

Among them, N _cs is the variable of the cyclic shift value, which is used to determine the number of possible values of the cyclic shift. N _cs can be indicated by high-level signaling or a predefined fixed value. For example, N _cs can be fixed to 12 or 16. n _cs to any value between 0 and N _cs -1, n _cs assigned to different terminal devices may be different, n _cs may be indicated by higher layer signaling or dynamic signaling.

Indicates rounding down.

In the filtering operation, the input data of the filtering process is the output data x _cs obtained by cyclically shifting the ZC sequence. In this process, the time domain continuous signal x _time can be expressed as:

The continuity processing of the ZC sequence in the second mode is equivalent to the cyclic shift of the ZC sequence, and then the operation in the first mode. In other words, in the second mode, the input data of the filtering operation is the ZC sequence obtained by the cyclic shift data x _cs, so similar, related parameter values of equation (11) can be found in equation (3) corresponding to the parameters described.

As an example and not a limitation, the above-mentioned process of cyclic shifting and filtering the ZC sequence to obtain a continuous time-domain continuous signal x _time is shown in steps S510, S520, and S540 in FIG. 5.

After the ZC sequence x _{q is} generated in step S510, the ZC sequence x _{q is} cyclically shifted in step S520 to obtain the output data x _cs , and x _cs is filtered in step S540, where the input data of the time domain filtering is the ZC sequence cyclically shifted The output data x _cs obtained after bit, and the output data after filtering is a continuous signal x _{time in the time} domain.

As another possible implementation, the transmitter can cyclically shift and reshape the ZC sequence to obtain a time-domain continuous signal of a time-domain symbol, and the duration of the time-domain continuous signal of a time-domain symbol is equal to N·T _s . Here, for the convenience of description, x _cs can be used to represent the data obtained after the ZC sequence is cyclically shifted, and x _time can be used to represent the time domain continuous signal obtained after the x _cs is shaped.

The process of cyclically shifting the ZC sequence by the transmitting end is the same as the process represented by formula (9), and will not be repeated here. In the shaping process, the sending end can reshape the output data x _cs obtained by cyclic shifting the ZC sequence to obtain the time domain continuous signal x _time , x _time can be expressed as:

x _time (t)=x _cs (n)·g(tn×T _s ), n=0,1,2,...,N-1 (12)

The time domain continuous signal x _time can also be expressed as formula (13), which is equivalent to combining formulas (9) and (12):

Among them, x _time (t) is the data at the t-th time in x _time ;

Is the value of the cyclic shift, N is the length of the ZC sequence, n is the index of the element in the ZC sequence, and mod is the modulo operation. Cyclic shift value

The method of determining can refer to the above description, which will not be repeated here. For the values and determination of other parameters in formula (12) and formula (13), please refer to formulas (4), (9) and other formulas for parameter determination methods or value ranges.

As an example and not a limitation, the above-mentioned process of cyclic shifting and shaping the ZC sequence to obtain a continuous time-domain continuous signal x _time is shown in steps S510, S520, and S540 in FIG. 5, wherein the filtering operation of step S540 Replaced with plastic surgery, the details will not be detailed.

As another possible implementation, the transmitter can sequentially cyclically shift the ZC sequence, add a cyclic prefix, and shape it to obtain a time-domain continuous signal of time-domain symbols. It can also perform a cyclic shift and add a cycle to the ZC sequence in sequence. Prefix and filtering obtain a time-domain continuous signal of time-domain symbols, which is equivalent to adding a cyclic prefix operation between cyclic shift and filtering or shaping in the possible implementations listed above, and a time-domain signal is obtained. The duration of the continuous signal in the time domain is equal to (N+N _cp )·T _s . The corresponding operation of adding a cyclic prefix can refer to formula (7). The input data of the cyclic prefix adding process is the data x _cs obtained after the ZC sequence is subjected to cyclic shift processing, and the input data for the filtering or shaping process is the x _cs passing through The data obtained after adding the cyclic prefix.

As an example and not a limitation, the above-mentioned process of cyclically shifting the ZC sequence, adding a cyclic prefix, and filtering to obtain a continuous time-domain continuous signal x _time is shown in steps S510 to S540 in FIG. 5.

Step S510 generates a ZC sequence x _q, in step S520 of the cyclic shift ZC sequence x _q obtain the output data x _cs, cyclic prefix is added to obtain the output data x _cp x _cs In step S530, the step S540 of the x _cp Perform filtering, where the input data of the time domain filtering is the output data x _cp obtained after the ZC sequence is cyclically shifted and the cyclic prefix is added, and the output data after filtering is the time domain continuous continuous signal x _time .

Optionally, the filtering operation in step S540 can be replaced with shaping, which will not be described in detail.

The cyclic shift does not affect the PAPR of the ZC sequence. Therefore, the PAPR of the data obtained after the cyclic shift of the ZC sequence is approximately 0 dB or equal to 0 dB in the time domain.

In summary, since the PAPR of the ZC sequence is 0 dB, cyclic shifting of the ZC sequence in the time domain does not affect the PAPR of the ZC sequence, and operations such as adding cyclic prefix, filtering or shaping have little effect on the PAPR of the ZC sequence. Therefore, the PAPR of the time-domain continuous signal x _time obtained after processing in the second method is approximately equal to the PAPR of the ZC sequence, that is, approximately 0 dB. If the continuous signal of a time domain symbol is used as the reference signal, the PAPR of the reference signal is basically the same as the PAPR of the single carrier waveform to send data, and the PAPR of the reference signal of the existing system is greatly reduced (such as LTE, NR system generation The PAPR of the reference signal may exceed 5 dB). Furthermore, when the reference signal with reduced PAPR passes through the power amplifier, the output power of the power amplifier can be increased, thereby improving the demodulation performance.

At the same time, the ZC sequence is cyclically shifted in the second method. Different terminal devices can be equipped with different n _cs , that is, different terminals can obtain different reference signals based on the same ZC sequence. For example, multiple terminal devices use multiple When the multi-input multi-output (MIMO) technology sends data, multiple terminal devices are configured with different n _cs so that the receiving end can distinguish the channels of different terminal devices during demodulation to ensure demodulation performance.

Way Three

As another example, the continuous processing of the ZC sequence by the transmitting end may include inverse fast Fourier transform (IFFT) processing. In other words, the transmitting end can perform an inverse fast Fourier transform on the ZC sequence to obtain a time domain continuous signal of a time domain symbol, and the duration of the time domain continuous signal of the one symbol is equal to N·T _s .

Optionally, the continuous processing of the ZC sequence by the transmitting end may include IFFT processing and adding a cyclic prefix. In other words, the transmitter can perform inverse fast Fourier transform and add cyclic prefix to the ZC sequence in sequence to obtain a time domain continuous signal of a time domain symbol. The duration of the time domain continuous signal of this symbol is equal to (N+N _cp )·T _s .

Exemplarily, the time domain continuous signal x _time of a time domain symbol obtained after the ZC sequence undergoes inverse fast Fourier transform and the addition of a cyclic prefix can be expressed as:

Among them, x _time (t) is the data at the t-th time in x _time . t _start ≤t<t _end , t _start , t, and t _end are all real numbers, and t _end -t _start = (N+N _cp )·T _s , for example, t _start = 0, t _end = (N+N _cp )·T _s . The length N of the ZC sequence is a positive integer, for example, N=2048, and N·T _s is the time length of time domain data for a period of time. N _cp is the length of the cyclic prefix, and N _cp ·T _s is the time length of the cyclic prefix. Δf is the sub-carrier spacing, for example, Δf=1/(N·T _s ). T _s is a time unit factor. T _s can be pre-configured, or it can be notified to terminal equipment by a network device such as a base station through signaling. For example, T _s can be discrete data obtained by discrete sampling of x _time (t), The time interval between two adjacent discrete data. t _offset is the delay offset, t _offset may be pre-configured, for example, t _offset =-N _cp ·T _s , t _offset may also be notified to the terminal device by a network device such as a base station through signaling. Optionally, t _offset may be fixed to 0, that is, there may be no t _offset term in formula (14).

Adjust the coefficient of output data power for inverse Fourier transform,

It can be 1, k ₁ and k ₂ are integers and satisfy k ₂ -k ₁ =N-1. k _re,offset is the frequency domain offset factor, k _re,offset can be pre-configured, for example, k _re,offset =1/2, k _re,offset can also be notified to terminal equipment by network equipment such as base station through signaling . k ₁ and k ₂ may be pre-configured or notified by higher layer signaling, for example, k ₁ =0, k ₂ =N-1; or

Optionally, k _re,offset may be fixed to 0, that is, there may be no k _re,offset term in formula (14).

Exemplarily, it is assumed in the embodiment of this application that t _start = 0, t _end = (N+N _cp )·T _s , t _offset = -N _cp · T _s , k _{re, offset} =0, and n'T _s ，N'=0,1,2,…,(N+N _cp )-1 When discretely sampling t, the continuous representation of the above inverse Fourier transform x _time (t) can be obtained as follows after discrete sampling Discrete representation:

Exemplarily, when N _cp in the embodiment of the present application is 0, formulas (14) and (15) can be used to describe the process of a continuous signal x _time of a time domain symbol obtained by performing inverse fast Fourier transform of the ZC sequence .

Optionally, the IFFT can also be replaced with an inverse discrete fourier transform (IDFT) or other equivalent implementations. Performing IFFT or other equivalent processing on the ZC sequence in the embodiment of the application can be understood as continuous processing on the ZC sequence.

As an example and not a limitation, the foregoing processing procedure of performing the inverse fast Fourier transform of the ZC sequence to obtain the time-domain continuous signal x _time is shown in the flow (a) in FIG. 6.

After the ZC sequence x _{q is} generated in step S610, IFFT is performed on the ZC sequence x _q in step S620 to obtain the output data as a continuous time domain signal x _time .

Since the PAPR of the ZC sequence is 0 dB, the PAPR of the time domain continuous signal x _time obtained by performing inverse fast Fourier transform of the ZC sequence in the frequency domain is still 0 dB. When the continuous signal of a time domain symbol is used as a reference signal, the PAPR of the reference signal is basically the same as the PAPR of the single-carrier waveform transmission data, and the PAPR of the reference signal of the existing system is greatly reduced (for example, the reference generated by the LTE and NR system) The PAPR of the signal may exceed 5 dB). Furthermore, when the reference signal with reduced PAPR passes through the power amplifier, the output power of the power amplifier can be increased, thereby improving the demodulation performance.

Way four

As another example, the continuous processing of the ZC sequence by the transmitting end may include IFFT and cyclic shift processing. In other words, the transmitting end can perform IFFT and cyclic shift on the ZC sequence to obtain a time domain continuous signal of a time domain symbol, and the duration of the time domain continuous signal of a time domain symbol is equal to N·T _s .

Optionally, the continuous processing of the ZC sequence by the transmitting end may include IFFT processing, cyclic shift processing and adding cyclic prefix. In other words, the sender can perform inverse fast Fourier transform, cyclic shift processing and cyclic prefix on the ZC sequence in sequence to obtain a time domain continuous signal of a time domain symbol, and the duration of the time domain continuous signal of this symbol Equal to (N+N _cp )·T _s .

Exemplarily, the time domain continuous signal of a time domain symbol obtained by the ZC sequence after IFFT, cyclic shift and cyclic prefix addition can be expressed by x _time , and then the time domain continuous signal of one symbol x _time can be determined by the following formula:

Formula (16) is equivalent to combining formula (14) and formula (9), so where

The values of k ₁ , k ₂ , k _{re, offset} , and t _offset are consistent with the previous description, and will not be repeated.

Similarly, the embodiment of the present application assumes that t _offset =0, k _re,offset =0, and discretely sample t with n'T _s , n'=0,1,2,...,(N+N _cp )-1 When the continuous representation x _time (t) of the data output after the above inverse Fourier transform, cyclic shift and cyclic prefix is added, after discrete sampling, the following discrete representation can be obtained:

Exemplarily, when N _cp in the embodiment of the present application is 0, formula (16) can be used to describe the time domain symbol continuous signal x _time obtained by performing inverse fast Fourier transform and cyclic shift of the ZC sequence process.

Cyclic shift value

It can be indicated by dynamic signaling, such as downlink control information (DCI); it can also be indicated by high-layer signaling, such as radio resource control (RRC) information; it can also be determined by a formula, such as formula (10 ), I will not repeat it here.

As an example and not a limitation, the foregoing processing procedure of performing inverse fast Fourier transform and cyclic shift of the ZC sequence to obtain a time-domain continuous signal x _time is shown in the flow (c) in FIG. 7.

After generating the ZC sequence x _{q in} step S710, perform IFFT on the ZC sequence x _q in step S720 to obtain the output data as x _ifft , and perform cyclic shift on x _ifft in step S730 to obtain a continuous time domain signal x _time .

Since a PAPR ZC sequence is 0 dB, the duration of the inverse fast Fourier transform on the obtained ZC sequence in the frequency domain PAPR N · T _s is the output data is 0 dB, for a duration of N · T _s The PAPR of the time domain continuous signal obtained by cyclic shifting the output data does not change and remains at 0 dB. The inverse Fourier transform and cyclic shift have little or no impact on the PAPR of the output signal in the process of obtaining a time domain continuous signal of a time domain symbol from the ZC sequence, so the obtained time domain continuous signal of a time domain symbol PAPR is equal to or similar to the PAPR of the ZC sequence. When the continuous signal of a time domain symbol is used as the reference signal, the PAPR of the reference signal is also approximately 0 dB or equal to 0 dB. The PAPR of the reference signal is the same as that of the single-carrier waveform. The PAPR is basically the same. At the same time, the PAPR of the reference signal of the existing system is greatly reduced (for example, the PAPR of the reference signal generated by the LTE and NR system may exceed 5 dB). The reference signal with reduced PAPR can increase the output of the power amplifier when it passes through the power amplifier. Power to improve demodulation performance.

Way Five

As another example, the continuity processing of the ZC sequence at the transmitting end may include phase rotation and inverse fast Fourier transform processing. In other words, the transmitting end may perform phase rotation and IFFT on the ZC sequence to obtain a time domain symbol of the time domain. Continuous signal, the duration of the time domain continuous signal of the one time domain symbol is equal to N·T _s .

Optionally, the continuous processing of the ZC sequence by the transmitting end may include phase rotation, IFFT, and adding a cyclic prefix. In other words, the transmitter can perform phase rotation, IFFT, and add cyclic prefix to the ZC sequence in sequence to obtain a time domain continuous signal of a time domain symbol. The duration of the time domain continuous signal of this symbol is equal to (N+N _cp ) · T _s .

Exemplarily, the time domain continuous signal of a time domain symbol obtained by the ZC sequence through phase rotation, inverse fast Fourier transform and cyclic prefix can be represented by x _time , and then the time domain continuous signal of a time domain symbol x _time can be passed The following formula is determined.

In the phase rotation process, for the convenience of description, the data obtained after the phase rotation of the ZC sequence is expressed as x _phase . Specifically, x _phase can be determined by the following formula:

x _phase (n)=x _q (n)·e ^j·α·n ，n=0,1,2,…,N-1 (18)

In the IFFT process, the input data of the IFFT is x _phase obtained after the phase rotation of the ZC sequence, and the time domain continuous signal x _time of one symbol obtained after IFFT and adding the cyclic prefix can be expressed as:

Wherein, x _phase for the length of the ZC sequence obtained by rotational phase rotation data is N, x _phase (n) is the n th value of x _phase; x _time of x _phase after the inverse fast Fourier transform to obtain a time-domain The symbol is a continuous signal in the time domain, x _time (t) is the value of x _time at the t time. α is the phase rotation factor, α can be indicated by high-level signaling or dynamic signaling, or α is a predefined fixed value.

among them

Similarly, the embodiment of the present application assumes that t _offset =0, k _re,offset =0, and discretely sample t with n'T _s , n'=0,1,2,...,(N+N _cp )-1 When the continuous representation x _time (t) of the output data after the above phase rotation, inverse Fourier transform and cyclic prefix is added is discretely sampled, the following discrete representation can be obtained:

x _phase (n)=x _q (n)·e ^j·α·n ，n=0,1,2,…,N-1 (20)

Exemplarily, when N _cp in the embodiment of the present application is 0, formulas (18)-(21) can be used to describe a continuous signal of a time domain symbol obtained by phase rotation and inverse fast Fourier transform of the ZC sequence x _time process.

As an example and not a limitation, the above-mentioned process of performing phase rotation and inverse fast Fourier transform of the ZC sequence to obtain a time-domain continuous signal x _time is shown in the flow (e) in FIG. 8.

After the ZC sequence x _{q is} generated in step S810, the ZC sequence x _q is phase-rotated to obtain the output data as x _phase in step S820, and the IFFT is performed on x _phase in step S830 to obtain a continuous time domain signal x _time .

Since the PAPR of the ZC sequence is 0 dB, the phase rotation of the ZC sequence in the frequency domain results in the rotation data x _phase of length N. This phase rotation does not affect the time domain continuous signal after the ZC sequence undergoes inverse Fourier transformation. Therefore, the PAPR of a time domain continuous signal x _time obtained by the inverse fast Fourier transform of x _phase is 0 dB. Phase rotation and inverse Fourier transform have little or no effect on the PAPR of the output signal in the process of obtaining a time domain continuous signal of a time domain symbol from the ZC sequence, so the PAPR of a time domain continuous signal of a time domain symbol is obtained It is equal to or similar to the PAPR of the ZC sequence. When the continuous signal of a time domain symbol is used as the reference signal, the PAPR of the reference signal is also approximately 0 dB or equal to 0 dB. The PAPR of the reference signal is the same as the PAPR of the single carrier waveform sending data It is basically the same. At the same time, the PAPR of the reference signal of the existing system is greatly reduced (for example, the PAPR of the reference signal generated by the LTE and NR system may exceed 5 dB). When the reference signal with reduced PAPR passes through the power amplifier, the output power of the power amplifier can be increased , Thereby improving demodulation performance.

Optionally, the time-domain data obtained after the ZC sequence is processed in the above manners 3, 4, and 5 can be used as a time-domain continuous signal of a time-domain symbol to be sent on a time-domain symbol, of course, it can also be The time-domain data obtained by correspondingly processing the ZC sequence in the above manners 3 to 5 is further processed and then sent as a time-domain continuous signal of a time-domain symbol on a time-domain symbol.

For the convenience of description, the embodiment of the present application uses _{x'time to} represent the time domain data obtained after the ZC sequence is processed accordingly in the above-mentioned modes 3 to 5, that is to say, it corresponds to a time domain symbol in the modes 3 to 5 continuous time domain representation of the _time signal X, application in the present embodiment, correspondingly replaced with x 'representation of _time, and will be x' time domain data obtained after further processing _time is represented by X _time, i.e., after x _'time for further processing to obtain a time domain time domain symbols continuous signal x _time. For the convenience of description, the embodiment of the present application refers to _x'time as an intermediate time domain continuous signal.

It should be understood that when N _{cp is} not 0 in the formulas in the above mode 3 to mode 5, the time domain continuous signal of a time domain symbol processed by adding a cyclic prefix can be obtained through the corresponding formula. Of course, the cyclic prefix can also be added. The prefix step is performed separately. The following formulas (22)-(24) describe when N _cp is 0 in the formulas in the third to the fifth mode, the intermediate time domain continuous signal x'obtained in the third to the fifth mode is _time for further processing.

As one example, the transmit end can obtain a time domain continuous signal x _time domain symbols of intermediate time-domain continuous signal x 'cyclic prefix, _time, which a time duration of the time domain continuous signal domain symbols is equal to (N + N _cp )·T _s , N _cp is the length of the cyclic prefix.

For example, a continuous intermediate time-domain signal x _'time input data using equation (7), in other words, in the embodiment of the present application embodiment Equation (7) is replaced with a continuous intermediate time-domain signal x' _time, the output data is obtained A time-domain continuous signal x _{time of} a time-domain symbol is specifically as follows:

x _time (n')=x' _time ((n'+offset)mod N), n'=0,1,2,...,N+N _cp -1 (22)

The values of the relevant parameters in the formula are as described above, and for details, please refer to the relevant description of formula (7), which will not be repeated here.

By way of example and not limitation, the above steps for successive intermediate domain signal x 'cyclic prefix in _time to give a flow of processing in 6 time-domain-domain symbol _time continuous signal X in FIG. (B) S610 to the step S630, the or Steps S710 to S740 in the process (d) in FIG. 7 or steps S810 to S840 in the process (f) in FIG. 8.

The output data of step S620 of process (b), the output data of step S730 of process (d), and the output data of step S830 of process (f) are the intermediate time domain continuous signal _x'time . In steps S630, S740, and S840, the corresponding x 'add cyclic prefix _time of continuous time-domain signals x _time, i.e. solid line box x _time.

As another example, the transmit end can successive intermediate time-domain signal x _'time shaping or filtering to obtain a continuous time domain signal x _time domain symbols, the duration of a time domain time domain symbols continuous signal equal to N · T _s .

For example, applying formula (3) to the intermediate time domain continuous signal _x'time , in other words, in the embodiment of the present application, the input data of formula (3) is replaced with the intermediate time domain continuous signal _x'time , and the output data obtained is A time-domain continuous signal x _{time of} a time-domain symbol is specifically represented by the following formula:

The values of the relevant parameters in the formula are as described above, and for details, please refer to the relevant description of formula (3), which will not be repeated here.

Again, a continuous domain of the intermediate signal x _'time input data using equation (4), in other words, application of the present embodiment will formula (4) is replaced with a continuous intermediate time-domain signal x' _time, the output data obtained It is a time-domain continuous signal x _time of a time-domain symbol, specifically expressed by the following formula:

x _time (t)=x' _time (n)·g(tn×T _s ), n=0,1,2,...,N-1 (24)

The values of the relevant parameters in the formula are as described above, and for details, please refer to the relevant description of formula (4), which will not be repeated here.

By way of example and not limitation, the foregoing successive intermediate time-domain signal x _'time filtering or shaping step of obtaining a processing procedure when in Scheme 6 domain symbols in time domain x _time continuous signal in FIG. (B), S610, S620, and step S640, or steps S710, S720, S730, and S750 of flow (d) in FIG. 7, and steps S810, S820, S830, and S850 of flow (f) in FIG. 8.

Process step (b) the output data of S620, the process step (d) the output data S730, the process step (f) the output data S830 domain continuous signal x is intermediate _'time, at step S640, S750, S850 respectively corresponding _{x'time is} filtered to obtain the time domain continuous signal x _time .

Optionally, the filtering in steps S640, S750, and S850 can be replaced with shaping.

As yet another example, the transmit end can intermediate time-domain continuous signal x _'time add cyclic prefix and filtered to give a time domain continuous signal x _time domain symbol, which is a duration time-domain continuous signal domain symbols is equal to ( N+N _cp )·T _s , where N _cp is the length of the cyclic prefix.

As yet another example, the transmit end can intermediate time-domain continuous signal x _'time add cyclic prefix and shaping to obtain a time domain continuous signal x _time domain symbol, which is a duration time-domain continuous signal domain symbols is equal to ( N+N _cp )·T _s , where N _cp is the length of the cyclic prefix.

Specifically, the determination formula can refer to formulas (22) to (24), which will not be repeated here.

As an example and not a limitation, the above-mentioned processing process of adding a cyclic prefix and filtering to the intermediate time domain continuous signal _x'time to obtain a time domain symbol of the time domain continuous signal x _time is shown in step S610 to step of flow (b) in FIG. 6 S640, or steps S710 to S750 of the process (d) in FIG. 7, and steps S810 to S850 of the process (f) in FIG. 8.

The output data of step S620 of process (b), the output data of step S730 of process (d), and the output data of step S830 of process (f) are the intermediate time domain continuous signal _x'time . In steps S630, S740, and S840, the corresponding x 'add cyclic prefix _time to obtain output data, each of x in step S640, S750, S850' cyclic prefix _time output data obtained by filtering the time domain to obtain a continuous _time signal x.

Since adding a cyclic prefix and/or filtering operation has little effect on the PAPR of the intermediate time domain continuous signal _x'time , the PAPR of a time domain continuous signal of a time domain symbol obtained by adding a cyclic prefix and/or filtering operation is approximately 0dB.

In step S220, the transmitting end transmits the time domain continuous signal of the one time domain symbol on one time domain symbol.

It should be understood that the embodiment of the present application only takes the transmitter to determine the time domain continuous signal of one time domain symbol as an example for description, and the method for the transmitter to determine the time domain continuous signal on other time domain symbols according to the ZC sequence is the same.

In the reference signal transmission method provided in the embodiment of the application, since the ZC sequence determined by the transmitting end is a constant modulus, its PAPR is 0 dB, and the duration of a time domain continuous signal of a time domain symbol determined according to the length of the ZC sequence is N Time is equal to N·T _s . The process of obtaining a time-domain continuous signal of a time-domain symbol from the ZC sequence has little effect on the PAPR of the ZC sequence, so that the PAPR of a time-domain continuous signal of a time-domain symbol is approximately 0 dB. When the continuous signal of one time domain symbol is used as a reference signal, it is equivalent to generating a reference signal with a lower PAPR. When the reference signal (time-domain continuous signal) is sent together with the single-carrier waveform data, the influence of the reference signal PAPR on the output power of the single-carrier waveform data can be reduced, thereby increasing the output power of the PA and improving the demodulation performance.

In some other embodiments, the duration of a time-domain continuous signal of a time-domain symbol is equal to N·T _s , the length of the ZC sequence determined by the transmitting end may be less than N, for example, the length of the ZC sequence is N-1 or Na, Where a is a positive integer; or the absolute value of the difference between the length of the ZC sequence and N is less than the preset value.

If the length of the ZC sequence is less than N, the sending end determines a time-domain continuous signal of a time-domain symbol according to the ZC sequence. The method is similar to the above example, only the parameter values in the formula are slightly different, and the final result is obtained after processing The PAPR of a time-domain continuous signal of a time-domain symbol can also be small, and the effect of reducing the PAPR of the reference signal can also be achieved.

Optionally, when there are multiple sending ends sending signals to the receiving end, the length of the ZC sequence determined by the multiple sending ends may all be N, or the length of the ZC sequence determined by a part of the sending end may be N, and a part of the sending end may determine The length of the ZC sequence is less than N.

After the time unit used to execute step S220 or in the time unit used to execute step S220, the reference signal sending method provided in the embodiment of the present application may further include step S230, as shown in FIG. 3, this step may be performed by the receiving end To execute, the receiving end may be, for example, the terminal device 120 or the network device 110 shown in FIG. 1. Steps S210 to S220 in the method shown in FIG. 3 are the same as the corresponding steps shown in FIG. 2, and will not be repeated here, and step S230 will be described in detail below.

In step S230, the receiving end performs data demodulation according to the reference signal sent by the sending end and the known reference signal.

When the reference signal and data are sent together, the receiving end can receive the reference signal sent by the sending end and the data sent by the sending end.

It should be understood that the reference signal received by the receiving end is the time domain continuous signal sent by the sending end. If the sending end sends a time domain continuous signal with a time domain symbol, the receiving end receives a reference signal with a time domain symbol. The transmitting end sends a time-domain continuous signal of multiple time-domain symbols, and the receiving end receives a reference signal of multiple time-domain symbols.

It should also be understood that the reference signal known by the receiving end in the embodiment of the present application is a ZC sequence known by both the transmitting end and the receiving end, that is, a ZC sequence of length N determined by the transmitting end.

Data demodulation at the receiving end can be achieved through the following steps.

Step 1: The receiving end performs channel estimation through a known reference signal to obtain the channel response of the symbol where the reference signal is located.

Exemplarily, channel estimation can be performed in the frequency domain. For example, if there is a cyclic prefix, the receiving end removes the CP from the time-domain continuous signal of the symbol of the received reference signal, and performs fast Fourier transform (FFT) to obtain the received frequency-domain reference signal; Reconstruct the ZC sequence with the known reference signal, that is, perform the same processing at the transmitting end to obtain the time domain continuous signal of the known reference signal, and the receiving end removes the CP from the time domain continuous signal of the symbol where the known reference signal is located. Perform fast Fourier transform to obtain an ideal frequency domain transmission reference signal; the receiving end divides the received frequency domain reference signal and the ideal frequency domain transmission reference signal to obtain the frequency domain channel response of the symbol where the reference signal is located.

Optionally, obtaining the channel response at the receiving end may also include operations such as noise removal, and the method is similar to the existing method, which will not be repeated here.

It should be understood that the above ideal frequency-domain transmission reference signal may be understood as a reference signal in which the frequency-domain reference signal received by the receiving end has not been transmitted through the channel.

Step 2: Obtain the channel response of the symbol where the data is located according to the channel response of the symbol where the reference signal is located.

As a possible implementation, the receiving end can obtain the channel response of the symbol where the data is located by means of assignment.

Exemplarily, the receiving end may use the obtained channel response of the symbol where the reference signal is located as the channel response of the symbol where the data is located.

As another possible implementation, the receiving end can obtain the channel response of the symbol where the data is located by interpolation. In other words, the receiving end uses the channel response of the symbol where the data is located at least 2 reference signals through linear interpolation or Gaussian interpolation. The channel response of the symbol where the data is located is obtained by interpolation and other methods.

Exemplarily, the receiving end may interpolate the channel response of the symbol where the first reference signal is located and the channel response of the symbol where the second reference signal is located to obtain the difference between the symbol where the first reference signal is located and the symbol where the second reference signal is located. The channel response of the symbol where the data is located.

It should be noted that the "first" and "second" in the above-mentioned first reference signal and the second reference signal are only exemplary, and are used to illustrate the sequence of the two reference signals in the time domain. , There is no limitation on the embodiments of this application.

If only one symbol in a time slot sends a reference signal, the receiving end can interpolate the channel response of the symbol of the reference signal in the current time slot and the channel response of the symbol of the reference signal in the next time slot to obtain two The channel response of the symbol of the data between the symbols of the reference signal.

Step 3: The receiving end uses the obtained channel response of the symbol where the data is located to perform operations such as equalization and demodulation on the data on these symbols to restore the data sent by the transmitting end.

In this step, the operation performed by the receiving end is the same as the existing method, and will not be repeated here.

The above reference signal transmission method determines the time domain continuous signal of a time domain symbol of the reference signal, but the reference signal is generally sent together with the data. For single carrier waveform data, when the reference signal is sent together with the data, The reference signal used as the demodulation reference signal and the transmitted data are time-division, that is, the reference signal and the data are located in different time domain symbols, and the bandwidth occupied by the frequency domain is the same.

Take Figure 9 as an example below to describe the case where the reference signal and data are sent together.

It should be understood that the reference signal sent with the data in the embodiment of the present application may be a time domain continuous signal sent with the data after the terminal device processes the ZC sequence.

It should also be understood that the positions and numbers of reference signals, the positions and numbers of data symbols, and the number of symbols owned by time slots in the embodiments of the present application are all exemplary, which do not constitute a limitation on the protection scope of the present application.

As shown in Figure 9, for example, a time slot contains 14 symbols, which are respectively symbol 0 to symbol 13. In this embodiment of the present application, symbol 0 can also be called the 0th symbol, and symbol 1 can also be called The first symbol, and so on, the symbol 13 can also be called the 13th symbol, where the reference signal is located in the front symbol 0, that is, in the 0th symbol, and the rear 13 symbols are used to send data. In the embodiment of the present application, the upstream transmission is taken as an example, and the upstream 13 symbols are sent to the upstream data.

Optionally, the symbol where the reference signal is located can also be other symbols, and correspondingly, the symbol where the data is located can also be other symbols; the number of symbols where the reference signal is located can also be other numbers, for example, 2 symbols are used to transmit the reference signal , Correspondingly, the number of symbols where the data is located can also be other numbers.

Optionally, the uplink data may adopt a single carrier waveform, for example, a single carrier quadrature amplitude modulation (single carrier quadrature amplitude modulation, SC-QAM) waveform.

As mentioned above, the duration of the time domain continuous signal x _time of a time domain symbol is equal to N·T _s , and N corresponds to the length of a symbol. In other words, when the cyclic prefix is not considered, the time within a time domain symbol The continuous signal in the domain contains N values after discrete sampling, and the time interval between the two values is T _s , then the duration of the time domain continuous signal of a time domain symbol is N·T _s . The ignorance of the cyclic prefix described here can be understood as in the methods of FIGS. 4 to 8, the processing of the ZC sequence by the sender does not include the operation of adding the cyclic prefix. When considering the cyclic prefix, the time-domain continuous signal in a time-domain symbol contains N+N _cp values after discrete sampling, and the duration of the time-domain continuous signal of a time-domain symbol is (N+N _cp )· T _s .

For data, a single carrier waveform is used for the upstream data as an example. Any data in a signal of time domain symbols used to transmit data is modulated data. Each data can be called a single carrier symbol with a duration of T _s Without considering the cyclic prefix, a signal of time-domain symbols used to transmit data includes N single-carrier symbols. The time domain symbols used to transmit data in the embodiments of the present application may also be referred to as data symbols. In the case of considering the cyclic prefix, the duration of a signal used for transmitting data symbols needs to consider the time occupied by the cyclic prefix.

It should be noted that, under the premise of considering the cyclic prefix, the cyclic prefix added for each symbol (including the symbol for transmitting the reference signal and the symbol for transmitting the data) may be the same or different.

The above-mentioned methods in FIGS. 4 to 8 may also be executed by the receiving end, for example, the above-mentioned method may be executed during the signal demodulation process of the receiving end. In the embodiment of the present application, the receiving end is a network device as an example for description.

step one

The network device receives the reference signal sent by the terminal device (that is, the time domain continuous signal of the symbol where the reference signal is located) and the data sent by the terminal device.

Step two

The network device performs channel estimation through a known reference signal (that is, a ZC sequence of length N known by both the network device and the terminal device), and the channel response of the symbol where the reference signal is located can be obtained. For example, the reference signal is located in the 0th symbol, and the network device can obtain the channel response of the 0th symbol through channel estimation.

As a possible implementation, the network device removes the cyclic prefix CP from the time domain continuous signal of the symbol where the received reference signal is located, and then performs a fast Fourier transform to obtain the received frequency domain reference signal; the network device converts the known reference signal After the cyclic prefix CP is removed from the time-domain continuous signal of the symbol, the fast Fourier transform is performed to obtain the frequency-domain transmission reference signal. This process can be understood as the network device re-transmitting the reference signal of the terminal device according to the method in Figure 4 to Figure 8. The frequency domain channel response can be obtained by dividing the two points.

Step three

The network equipment determines the channel response of the symbol where the data is located.

As a possible implementation, if a time slot has only one symbol to transmit the reference signal, the channel response of the data symbol can be obtained by means of assignment or interpolation.

For example, when the channel changes slowly, you can use the method of assignment. The way of assignment can be understood as taking the channel response of the symbol where the reference signal is obtained in step 2 as the channel response of the data symbol. Exemplarily, a time slot has 14 symbols, of which the 0th symbol is used to transmit reference signals, and the 1st to 13th symbols are used to transmit data. Then the channel of the 0th symbol is determined in step 2. The response can be used as the channel response from the 1st symbol to the 13th symbol.

For another example, the channel response of the data symbol can also be obtained by interpolation. Interpolation can be understood as using the channel response of the symbols where at least two reference signals are located to obtain the channel response of the data symbol through linear interpolation or Gaussian interpolation. Exemplarily, a slot has 14 symbols, of which the 0th symbol is used to send a reference signal, and the 1st to 13th symbols are used to send data. The channel response can be through the 0th symbol of the current slot Interpolate with the channel response of the 0th symbol of the next time slot to obtain the channel response from the 1st symbol to the 13th symbol of the current time slot. In this method, in order to obtain the channel response of the first symbol to the 13th symbol of the current time slot, it is necessary to receive the next time slot data and obtain the channel response of the 0th symbol of the next time slot.

Step Four

The network equipment uses the channel response of the data symbol to perform operations such as equalization and demodulation on the received data on the data symbol to restore the transmitted data. Exemplarily, taking the channel response of the 0th symbol and the channel response of the 1st symbol to the 13th symbol obtained in steps 2 and 3 as an example, the network equipment can use the channel response of the 1st symbol to the 13th symbol The channel response equalizes and demodulates the received data of these symbols.

The method embodiments of the embodiments of the present application are described in detail above with reference to FIGS. 1 to 9, and the device embodiments of the embodiments of the present application are described in detail below with reference to FIGS. 10 to 11. It should be understood that the description of the method embodiment and the description of the device embodiment correspond to each other, and therefore, the parts that are not described in detail can refer to the previous method embodiment.

FIG. 10 is a schematic structural diagram of a communication device provided by an embodiment of the present application. The communication apparatus 1000 in FIG. 10 may be a specific example of the terminal device 120 or the network device 110 in FIG. 1. The communication device shown in FIG. 10 can be used to execute the methods in FIG. 2 to FIG. 8. To avoid redundancy, the description will not be repeated.

The communication device 1000 shown in FIG. 10 may include a determining module 1010 and a sending module 1020.

The determining module 1010 is configured to determine a time-domain continuous signal of a time-domain symbol according to the ZC sequence, where the length of the ZC sequence is N, and the duration of the time-domain continuous signal of the one time-domain symbol is equal to N·T _s , Or, in the case where the time domain continuous signal of the one time domain symbol includes a cyclic prefix, the duration of the time domain continuous signal of the one time domain symbol is equal to (N+N _cp )·T _s , and N is a positive integer , N _cp · T _s is the duration of the cyclic prefix, N _cp is a positive integer, and T _s is a time unit factor.

The sending module 1020 is configured to send a time domain continuous signal of the one time domain symbol on the one time domain symbol.

Optionally, the determining module 1010 is specifically configured to filter the ZC sequence to obtain a time domain continuous signal of the one time domain symbol, and the duration of the time domain continuous signal of the one time domain symbol is equal to N·T _s .

Optionally, the determining module 1010 is specifically configured to add a cyclic prefix and filter to the ZC sequence to obtain the time domain continuous signal of the one time domain symbol, and the duration of the time domain continuous signal of the one time domain symbol is equal to ( N+N _cp )·T _s .

Optionally, the determining module 1010 is specifically configured to cyclically shift and filter the ZC sequence to obtain the time domain continuous signal of the one time domain symbol, and the duration of the time domain continuous signal of the one time domain symbol is equal to N·T _s .

Optionally, the determining module 1010 is specifically configured to sequentially cyclically shift, add a cyclic prefix, and filter the ZC sequence to obtain the time domain continuous signal of the one time domain symbol, and the time domain continuous signal of the one time domain symbol The duration of the signal is equal to (N+N _cp )·T _s .

Optionally, the determining module 1010 is specifically configured to perform inverse Fourier transform and cyclic shift on the ZC sequence to obtain the time domain continuous signal of the one time domain symbol, and the time domain continuous signal of the one time domain symbol The duration of is equal to N·T _s .

Optionally, the determining module 1010 is specifically configured to sequentially perform inverse Fourier transform, cyclic shift, and filtering on the ZC sequence to obtain the time domain continuous signal of the one time domain symbol, and the time domain of the one time domain symbol The duration of the domain continuous signal is equal to N·T _s .

Optionally, the determining module 1010 is specifically configured to sequentially perform inverse Fourier transform, cyclic shift, and add cyclic prefix to the ZC sequence to obtain the time domain continuous signal of the one time domain symbol, and the one time domain symbol The duration of the continuous signal in the time domain is equal to (N+N _cp )·T _s .

Optionally, the determining module 1010 is specifically configured to sequentially perform inverse Fourier transform, cyclic shift, cyclic prefix addition, and filtering on the ZC sequence to obtain the time-domain continuous signal of the one time-domain symbol, and the one time-domain symbol The duration of the time domain continuous signal of the domain symbol is equal to (N+N _cp )·T _s .

Optionally, the determining module 1010 is specifically configured to perform inverse Fourier transform on the ZC sequence to obtain the time domain continuous signal of the one time domain symbol, and the duration of the time domain continuous signal of the one time domain symbol is equal to N·T _s .

Optionally, the determining module 1010 is specifically configured to perform inverse Fourier transform and filtering on the ZC sequence to obtain the time domain continuous signal of the one time domain symbol, and the duration of the time domain continuous signal of the one time domain symbol Time is equal to N·T _s .

Optionally, the determining module 1010 is specifically configured to perform inverse Fourier transform on the ZC sequence and add a cyclic prefix to obtain the time domain continuous signal of the one time domain symbol, and the time domain continuous signal of the one time domain symbol The duration of is equal to (N+N _cp )·T _s .

Optionally, the determining module 1010 is specifically configured to perform inverse Fourier transform, add a cyclic prefix, and filter the ZC sequence to obtain the time domain continuous signal of the one time domain symbol, and the time domain of the one time domain symbol The duration of the continuous signal is equal to (N+N _cp )·T _s .

Optionally, the determining module 1010 is specifically configured to perform phase rotation and inverse Fourier transform on the ZC sequence to obtain the time domain continuous signal of the one time domain symbol, and the time domain continuous signal of the one time domain symbol The duration is equal to N·T _s .

Optionally, the determining module 1010 is specifically configured to sequentially perform phase rotation, inverse Fourier transform, and filtering on the ZC sequence to obtain the time domain continuous signal of the one time domain symbol, and the time domain signal of the one time domain symbol The duration of the continuous signal is equal to N·T _s .

Optionally, the determining module 1010 is specifically configured to sequentially perform phase rotation, inverse Fourier transform, and cyclic prefix addition on the ZC sequence to obtain the time domain continuous signal of the one time domain symbol, and the time domain continuous signal of the one time domain symbol The duration of the continuous signal in the time domain is equal to (N+N _cp )·T _s .

Optionally, the determining module 1010 is specifically configured to sequentially perform phase rotation, inverse Fourier transform, cyclic prefix addition, and filtering on the ZC sequence to obtain the time-domain continuous signal of the one time-domain symbol, and the one time-domain symbol The duration of the time-domain continuous signal of the symbol is equal to (N+N _cp )·T _s .

Optionally, the communication device 1000 further includes a receiving module configured to receive cyclic shift indication information, where the cyclic shift indication information is used to indicate the cyclic shift.

Optionally, the cyclic shift indication information is carried in downlink control information DCI or radio resource control RRC message.

FIG. 11 is a schematic structural diagram of a communication device provided by an embodiment of the present application. The communication device 1100 in FIG. 11 may be a specific example of the terminal device 120 or the network device 110 in FIG. 1. The communication device shown in FIG. 11 can be used to execute the methods in FIGS. 2 to 8. To avoid redundancy, the description will not be repeated.

The communication device may be a terminal device or a network device, or a device in a terminal device or a network device, or a device that can be matched and used with a terminal device or a network device. Wherein, the communication device may be a chip system. In the embodiments of the present application, the chip system may be composed of chips, or may include chips and other discrete devices. The communication device 1100 includes at least one processor 1120, configured to implement the method provided in the embodiment of the present application. Exemplarily, the processor 1120 may be used to determine a ZC sequence, determine a time-domain continuous signal of a time-domain symbol according to the ZC sequence, etc. For details, refer to the detailed description in the method example, which is not repeated here. Optionally, the function of the processor 1120 is the same as that of the determining module 1010.

The communication device 1100 may further include at least one memory 1130 for storing program instructions and/or data. The memory 1130 and the processor 1120 are coupled. The coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units, or modules, and may be in electrical, mechanical or other forms, and is used for information exchange between devices, units or modules. The processor 1120 may cooperate with the memory 1130 to operate. The processor 1120 may execute program instructions stored in the memory 1130. At least one of the at least one memory may be included in the processor.

The communication device 1100 may further include a communication interface 1110 for communicating with other devices through a transmission medium, so that the device used in the communication device 1100 can communicate with other devices. Exemplarily, the communication interface may be a transceiver, circuit, bus, module, pin, or other type of communication interface. Exemplarily, the communication device 1100 is a terminal device, and the other device is a network device. The processor 1120 uses the communication interface 1110 to send and receive data, and is used to implement the method executed by the terminal device described in the embodiment corresponding to FIG. 4 to FIG. 8.

The specific connection medium between the communication interface 1110, the processor 1120, and the memory 1130 is not limited in the embodiment of the present application. In the embodiment of the present application, in FIG. 11, the memory 1130, the processor 1120, and the communication interface 1110 are connected by a bus 1140. The bus is represented by a thick line in FIG. 11, and the connection mode between other components is only for schematic illustration. , Is not limited. The bus may be a peripheral component interconnect standard (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, only one thick line is used to represent in FIG. 11, but it does not mean that there is only one bus or one type of bus.

In the embodiments of the present application, the processor may be a central processing unit, a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware The components or any combination thereof can implement or execute the methods, steps, and logical block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor. The processor may also be a combination that implements computing functions, for example, a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, and so on. The steps of the method disclosed in the embodiments of the present application may be embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor.

In the embodiment of the present application, the memory may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., or a volatile memory (volatile memory), for example Random-access memory (random-access memory, RAM). The memory is any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto. The memory in the embodiments of the present application may also be a circuit or any other device capable of realizing a storage function, for storing program instructions and/or data.

Those skilled in the art may realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed in this document can be implemented by computer software, electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Those skilled in the art can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of the present application.

Those skilled in the art can clearly understand that, for the convenience and conciseness of description, the specific working process of the above-described system, device, and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

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

The methods provided in the embodiments of the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented by software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a dedicated computer, a computer network, network equipment, user equipment, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website, computer, server, or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center integrated with one or more available media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a digital video disc (digital video disc, DVD for short)), or a semiconductor medium (for example, SSD).

In the embodiments of the present application, provided that there is no logical contradiction, the embodiments can be mutually cited. For example, methods and/or terms between method embodiments can be mutually cited, such as functions and/or functions between device embodiments. Or terms may refer to each other, for example, functions and/or terms between the device embodiment and the method embodiment may refer to each other.

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

A method for sending a reference signal, characterized in that it comprises:

Determine a time-domain continuous signal of a time-domain symbol according to the ZC sequence, where the length of the ZC sequence is N, and the duration of the time-domain continuous signal of the one time-domain symbol is equal to N·T s , or, in the In the case that the time domain continuous signal of one time domain symbol includes a cyclic prefix, the duration of the time domain continuous signal of the one time domain symbol is equal to (N+N cp )·T s , N is a positive integer, and N cp ·T s is the duration of the cyclic prefix, N cp is a positive integer, and T s is the time unit factor;

Sending a time domain continuous signal of the one time domain symbol on the one time domain symbol.
The method according to claim 1, wherein the determining a time-domain continuous signal of a time-domain symbol according to the ZC sequence comprises:

The ZC sequence is filtered to obtain the time domain continuous signal of the one time domain symbol, and the duration of the time domain continuous signal of the one time domain symbol is equal to N·T s .
The method according to claim 1, wherein the determining a time-domain continuous signal of a time-domain symbol according to the ZC sequence comprises:

A cyclic prefix and filtering are added to the ZC sequence to obtain a time domain continuous signal of the one time domain symbol, and the duration of the time domain continuous signal of the one time domain symbol is equal to (N+N cp )·T s .
The method according to claim 2 or 3, wherein the determining a time-domain continuous signal of a time-domain symbol according to the ZC sequence further comprises:

Perform a cyclic shift on the ZC sequence.
The method according to claim 1, wherein the determining a time-domain continuous signal of a time-domain symbol according to the ZC sequence comprises:

Perform inverse Fourier transform and cyclic shift on the ZC sequence to obtain the time domain continuous signal of the one time domain symbol, and the duration of the time domain continuous signal of the one time domain symbol is equal to N·T s .
The method according to claim 1, wherein the determining a time-domain continuous signal of a time-domain symbol according to the ZC sequence comprises:

Performing an inverse Fourier transform on the ZC sequence to obtain a time domain continuous signal of the one time domain symbol, and the duration of the time domain continuous signal of the one time domain symbol is equal to N·T s .
The method according to claim 1, wherein the determining a time-domain continuous signal of a time-domain symbol according to the ZC sequence comprises:

Performing phase rotation and inverse Fourier transform on the ZC sequence to obtain the time domain continuous signal of the one time domain symbol, and the duration of the time domain continuous signal of the one time domain symbol is equal to N·T s .
The method according to claim 4 or 5, further comprising:

Receiving cyclic shift indication information, where the cyclic shift indication information is used to indicate the cyclic shift.
The method according to claim 8, wherein the cyclic shift indication information is carried in downlink control information, DCI, or radio resource control, RRC, message.
A device, characterized by being used to implement the method according to any one of claims 1-9.
An apparatus comprising a processor and a memory, the memory and the processor are coupled, and the processor is used to execute the method according to any one of claims 1-9.
A device including a processor and a communication interface,

The processor is configured to determine a time domain continuous signal of a time domain symbol according to a ZC sequence, wherein the length of the ZC sequence is N, and the duration of the time domain continuous signal of the one time domain symbol is equal to N·T s , Or, in the case where the time domain continuous signal of the one time domain symbol includes a cyclic prefix, the duration of the time domain continuous signal of the one time domain symbol is equal to (N+N cp )·T s , and N is a positive integer , N cp · T s is the duration of the cyclic prefix, N cp is a positive integer, and T s is the time unit factor;

The processor uses the communication interface to send a time domain continuous signal of the one time domain symbol on the one time domain symbol.
A computer-readable storage medium, comprising instructions, which when run on a computer, cause the computer to execute the method according to any one of claims 1 to 9.
A computer program product comprising instructions, which when run on a computer, cause the computer to execute the method described in any one of claims 1 to 9.