CN108289069B

CN108289069B - Transmission method, sending end and receiving end of reference signal

Info

Publication number: CN108289069B
Application number: CN201710013273.3A
Authority: CN
Inventors: 李辉; 高秋彬; 塔玛拉卡·拉盖施; 陈润华; 苏昕; 黄秋萍
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2017-01-09
Filing date: 2017-01-09
Publication date: 2020-10-16
Anticipated expiration: 2037-01-09
Also published as: CN108289069A

Abstract

The invention provides a transmission method, a sending end and a receiving end of a reference signal, and the method can comprise the following steps: a transmitting end transmits a demodulation reference signal to a receiving end on a DFT-S-OFDM symbol; and the transmitting end transmits the phase tracking reference signal and the data signal to the receiving end in a frequency division multiplexing mode on the DFT-S-OFDM symbol. The embodiment of the invention can reduce the phase noise of DFT-S-OFDM signal transmission.

Description

Transmission method, sending end and receiving end of reference signal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a transmission method, a transmitting end, and a receiving end for a reference signal.

Background

Signals of a communication system often have phase noise during transmission, wherein the phase noise comes from local oscillators in a transmitter and a receiver, and the phase noise has influence on the transmission of multi-carrier signals. And the influence of phase noise will be more severe in the high frequency band (e.g., above 6 GHz). However, in future communication systems, more resources of high frequency bands are used for data transmission, such as: in the future, 5G will use resources in high frequency band (e.g. 6GHz to 100GHz) for data communication, and in the future, 6G will also use resources in high frequency band for data communication. In a communication system, a Peak-to-Average-Power Ratio (PAPR) is considered, and a Discrete Fourier Transform Spread Orthogonal frequency division Multiplexing (DFT-S-OFDM) signal is used for transmission. While transmission using DFT-S-OFDM signals also has the effect of phase noise. It can be seen that how to reduce the phase noise of DFT-S-OFDM signal transmission is a technical problem which needs to be solved urgently at present.

Disclosure of Invention

The invention aims to provide a transmission method of a reference signal, a sending end and a receiving end so as to achieve the purpose of reducing phase noise of DFT-S-OFDM signal transmission.

In order to achieve the above object, an embodiment of the present invention provides a method for transmitting a reference signal, including:

a transmitting end transmits a demodulation reference signal to a receiving end on a DFT-S-OFDM symbol;

and the transmitting end transmits the phase tracking reference signal and the data signal to the receiving end in a frequency division multiplexing mode on the DFT-S-OFDM symbol.

Optionally, the DFT-S-OFDM symbol where the phase tracking reference signal and the data signal are located is a different symbol from the DFT-S-OFDM symbol where the demodulation reference signal is located.

Optionally, the transmitting end transmits the demodulation reference signal to the receiving end on the DFT-S-OFDM symbol, including:

the sending end maps demodulation reference signals to N subcarriers of DFT-S-OFDM symbols, converts the demodulation reference signals on the N subcarriers to a time domain and sends the time domain to the receiving end, wherein N is the number of the subcarriers of transmission bandwidth.

Optionally, the transmitting end transmits the phase tracking reference signal and the data signal to the receiving end in a frequency division multiplexing manner on the DFT-S-OFDM symbol, including:

the sending end maps the phase tracking reference signal to M subcarriers in N subcarriers of a DFT-S-OFDM symbol;

mapping T modulation symbols of a data signal onto T subcarriers of the N subcarriers except the M subcarriers;

and converting the phase tracking reference signals on the M subcarriers and the modulation symbols on the T subcarriers into a time domain and sending the time domain to the receiving end, wherein the T plus the M is less than or equal to the N, and the N is the number of subcarriers of the transmission bandwidth.

Optionally, the mapping T modulation symbols of the data signal to T subcarriers of the N subcarriers except for the M subcarriers includes:

performing serial-parallel conversion on T modulation symbols of a data signal to obtain T parallel modulation symbols, performing discrete Fourier transform on the T parallel modulation symbols to obtain T output data, and mapping the T output data to T subcarriers except the M subcarriers in the N subcarriers; or

The method comprises the steps of carrying out serial-to-parallel conversion on N modulation symbols of a data signal to obtain N parallel modulation symbols, carrying out discrete Fourier transform on the N parallel modulation symbols to obtain N output data, selecting T output data from the N output data, and mapping the T output data to T subcarriers except for M subcarriers in the N subcarriers.

The embodiment of the invention also provides a transmission method of the reference signal, which comprises the following steps:

a receiving end receives a demodulation reference signal transmitted by a transmitting end on a DFT-S-OFDM symbol and estimates channel information of the demodulation reference signal;

the receiving end receives a phase tracking reference signal and a data signal which are transmitted by the transmitting end in a frequency division multiplexing mode on a DFT-S-OFDM symbol, and estimates channel information of the phase tracking reference signal;

the receiving end compensates the channel information of the demodulation reference signal based on the channel information of the phase tracking reference signal to obtain compensated channel information;

the receiving end demodulates the data signal using the compensation channel information.

Optionally, the receiving end receives a demodulation reference signal transmitted by a transmitting end on a DFT-S-OFDM symbol, and estimates channel information of the demodulation reference signal, including:

and the receiving end receives the demodulation reference signal transmitted by the transmitting end on the DFT-S-OFDM symbol, carries out frequency domain transformation on the demodulation reference signal and estimates the channel information of the demodulation reference signal after the frequency domain transformation.

Optionally, the receiving end receives a phase tracking reference signal and a data signal frequency division multiplexed on a DFT-S-OFDM symbol by the transmitting end, and estimates channel information of the phase tracking reference signal, including:

and the receiving end receives the phase tracking reference signal and the data signal which are subjected to frequency division multiplexing transmission on the DFT-S-OFDM symbol by the transmitting end, performs frequency domain transformation on the signal received on the DFT-S-OFDM symbol, and estimates channel information of the phase tracking reference signal after the frequency domain transformation.

Optionally, the compensating, by the receiving end, the channel information of the demodulation reference signal based on the channel information of the phase tracking reference signal to obtain compensated channel information, where the compensating includes:

and the receiving end compares the channel information of the phase tracking reference signal with the channel information of the demodulation reference signal to obtain the phase change information of the DFT-S-OFDM symbol where the phase tracking reference signal and the data signal are located relative to the DFT-S-OFDM symbol where the demodulation reference signal is located, and compensates the channel information of the demodulation reference signal by using the phase change information to obtain the compensation channel information.

the receiving end receives phase tracking reference signals and data signals which are subjected to frequency division multiplexing transmission on a plurality of DFT-S-OFDM symbols by the transmitting end, carries out frequency domain transformation on the signals received on each DFT-S-OFDM symbol in the DFT-S-OFDM symbols, and estimates channel information of the phase tracking reference signals in each DFT-S-OFDM symbol after the frequency domain transformation;

the receiving end compensates the channel information of the demodulation reference signal based on the channel information of the phase tracking reference signal to obtain compensated channel information, and the method comprises the following steps:

the receiving end compares the channel information of the phase tracking reference signal in each DFT-S-OFDM symbol with the channel information of the demodulation reference signal to obtain the phase change information of each DFT-S-OFDM symbol relative to the DFT-S-OFDM symbol where the demodulation reference signal is located, and compensates the channel information of the demodulation reference signal by using the phase change information corresponding to each DFT-S-OFDM symbol to obtain the compensation channel information corresponding to each DFT-S-OFDM symbol;

the receiving end demodulates the data signal using the compensation channel information, including:

and demodulating the respective data signals by using the compensation channel information corresponding to each DFT-S-OFDM symbol.

An embodiment of the present invention further provides a sending end, including:

the first transmission module is used for transmitting a demodulation reference signal to a receiving end on a DFT-S-OFDM symbol;

and the second transmission module is used for transmitting the phase tracking reference signal and the data signal to the receiving end in a frequency division multiplexing mode on the DFT-S-OFDM symbol.

Optionally, the first transmission module is configured to map a demodulation reference signal to N subcarriers of a DFT-S-OFDM symbol, transform the demodulation reference signal on the N subcarriers to a time domain, and send the time domain to the receiving end, where N is the number of subcarriers of a transmission bandwidth.

Optionally, the second transmission module includes:

a first mapping unit, configured to map the phase tracking reference signal to M subcarriers of N subcarriers of a DFT-S-OFDM symbol;

a second mapping unit, configured to map T modulation symbols of a data signal onto T subcarriers of the N subcarriers except for the M subcarriers;

and the transformation unit is used for transforming the phase tracking reference signals on the M subcarriers and the modulation symbols on the T subcarriers into a time domain and sending the time domain to the receiving end, wherein the T plus the M is less than or equal to the N, and the N is the number of the subcarriers of the transmission bandwidth.

Optionally, the second mapping unit is configured to perform serial-to-parallel conversion on T modulation symbols of a data signal to obtain T parallel modulation symbols, perform discrete fourier transform on the T parallel modulation symbols to obtain T output data, and map the T output data to T subcarriers, except for the M subcarriers, of the N subcarriers; or

The second mapping unit is configured to perform serial-to-parallel conversion on N modulation symbols of a data signal to obtain N parallel modulation symbols, perform discrete fourier transform on the N parallel modulation symbols to obtain N output data, select T output data from the N output data, and map the T output data to T subcarriers of the N subcarriers except for the M subcarriers.

An embodiment of the present invention further provides a receiving end, including:

the first receiving module is used for receiving a demodulation reference signal transmitted by a transmitting end on a DFT-S-OFDM symbol and estimating channel information of the demodulation reference signal;

a second receiving module, configured to receive a phase tracking reference signal and a data signal frequency-division multiplexed and transmitted on a DFT-S-OFDM symbol by the sending end, and estimate channel information of the phase tracking reference signal;

the compensation module is used for compensating the channel information of the demodulation reference signal based on the channel information of the phase tracking reference signal to obtain compensation channel information;

a demodulation module for demodulating the data signal using the compensation channel information.

Optionally, the first receiving module is configured to receive a demodulation reference signal transmitted by a transmitting end on a DFT-S-OFDM symbol, perform frequency domain transformation on the demodulation reference signal, and estimate channel information of the demodulation reference signal after the frequency domain transformation.

Optionally, the second receiving module is configured to receive a phase tracking reference signal and a data signal frequency-division multiplexed and transmitted on a DFT-S-OFDM symbol by the sending end, perform frequency domain transformation on the signal received on the DFT-S-OFDM symbol, and estimate channel information of the phase tracking reference signal after the frequency domain transformation.

Optionally, the compensation module is configured to compare the channel information of the phase tracking reference signal with the channel information of the demodulation reference signal to obtain phase change information of the DFT-S-OFDM symbol where the phase tracking reference signal and the data signal are located relative to the DFT-S-OFDM symbol where the demodulation reference signal is located, and compensate the channel information of the demodulation reference signal by using the phase change information to obtain compensation channel information.

Optionally, the second receiving module is configured to receive a phase tracking reference signal and a data signal frequency-division multiplexed and transmitted by the transmitting end on a plurality of DFT-S-OFDM symbols, perform frequency domain transformation on a signal received on each DFT-S-OFDM symbol in the plurality of DFT-S-OFDM symbols, and estimate channel information of the phase tracking reference signal in each DFT-S-OFDM symbol after the frequency domain transformation;

the compensation module is used for comparing the channel information of the phase tracking reference signal in each DFT-S-OFDM symbol with the channel information of the demodulation reference signal to obtain the phase change information of each DFT-S-OFDM symbol relative to the DFT-S-OFDM symbol where the demodulation reference signal is located, and respectively compensating the channel information of the demodulation reference signal by using the phase change information corresponding to each DFT-S-OFDM symbol to obtain the compensation channel information corresponding to each DFT-S-OFDM symbol;

the demodulation module is used for demodulating respective data signals by using the compensation channel information corresponding to each DFT-S-OFDM symbol.

The technical scheme of the invention at least has the following beneficial effects:

in the embodiment of the invention, a sending end transmits a demodulation reference signal to a receiving end on a DFT-S-OFDM symbol; and the transmitting end transmits the phase tracking reference signal and the data signal to the receiving end in a frequency division multiplexing mode on the DFT-S-OFDM symbol. Because the phase tracking reference signal and the data signal are frequency division multiplexed on the DFT-S-OFDM symbol, a receiving end can perform channel compensation on channel information of the demodulation reference signal based on the phase tracking reference signal, and the phase noise of DFT-S-OFDM signal transmission can be reduced by using the compensated channel information to mediate the data signal.

Drawings

Fig. 1 is a schematic diagram of a network structure according to an embodiment of the present invention;

fig. 2 is a flowchart of a method for transmitting a reference signal according to an embodiment of the present invention;

fig. 3 is a schematic diagram of transmission of a reference signal according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a transmission structure of a transmitting end according to an embodiment of the present invention;

fig. 5 is a schematic diagram illustrating another transmission of a reference signal according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a transmission structure of another transmitting end according to an embodiment of the present invention;

fig. 7 is a flowchart of another method for transmitting a reference signal according to an embodiment of the present invention;

fig. 8 is a structural diagram of a transmitting end according to an embodiment of the present invention;

fig. 9 is a structural diagram of another transmitting end according to an embodiment of the present invention;

fig. 10 is a structural diagram of a receiving end according to an embodiment of the present invention;

fig. 11 is a structural diagram of another transmitting end according to an embodiment of the present invention;

fig. 12 is a structural diagram of another receiving end according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, fig. 1 is a network structure diagram applicable to an embodiment of the present invention, and as shown in fig. 1, includes a sending end 11 and a receiving end 12, where the sending end 11 may be understood as a device that transmits (or sends) data, and the receiving end 12 may be understood as a device that receives data. In the drawings, a sending end 11 is taken as user equipment, and a receiving end 12 is taken as network side equipment for example, but in the embodiment of the present invention, the sending end 11 may be network side equipment, and when the sending end 11 is network side equipment, the receiving end 12 may be user equipment or network side equipment; or when the sending end 11 is a user equipment, the receiving end 12 may be a network side device or a user equipment. In addition, in the embodiment of the present invention, the user equipment may be a terminal side Device such as a Mobile phone, a tablet personal Computer (tablet personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), or a Wearable Device (Wearable Device), and it should be noted that, in the embodiment of the present invention, the specific type of the sending end 11 is not limited, and the network side Device may be a Transmission Receiving Point (TRP), or may be a base station, and the base station may be a macro station such as an LTE eNB, a 5G NR NB, and the like. Or the network side device may be an Access Point (AP). It should be noted that, in the embodiment of the present invention, the specific type of the network-side device is not limited.

Referring to fig. 2, an embodiment of the present invention provides a method for transmitting a reference signal, as shown in fig. 2, including the following steps:

201. a transmitting end transmits a demodulation reference Signal (De modulation reference Signal, DMRS) to a receiving end on a DFT-S-OFDM symbol;

202. the transmitting end transmits a Phase Tracking Reference Signal (PTRS) and a data Signal to the receiving end in a frequency division multiplexing manner on the DFT-S-OFDM symbol.

In step 201, a demodulation reference signal may be transmitted to a receiving end on one or more DFT-S-OFDM symbols in a certain subframe or a certain slot (slot), where the demodulation reference signal is used by the receiving end to demodulate a data signal.

And step 202 may be transmitting the phase tracking reference signal and the data signal to the receiving end in a frequency division multiplexing manner on one or more DFT-S-OFDM symbols in a certain subframe or a certain time slot. And one or more sub-carriers in the same DFT-S-OFDM symbol transmit phase tracking reference signals, and all the rest of the sub-carriers transmit data signals.

The DFT-S-OFDM symbol for transmitting the demodulation reference signal and the DFT-S-OFDM symbol for transmitting the frequency division multiplexing transmission phase tracking reference signal and the data signal can be DFT-S-OFDM symbols in the same subframe or the same time slot. In addition, in the embodiment of the present invention, the execution order of step 201 and step 202 is not limited, for example: it may be performed simultaneously, or step 202 may be performed before step 201, or vice versa. The step 201 is first executed in the figure for illustration. The data signal may be uplink data, and may also be downlink data in some scenarios, which is not limited to this.

It should be noted that, in the embodiment of the present invention, the phase tracking reference signal is not limited, and the reference signal may be any reference signal capable of tracking a phase change of each DFT-S-OFDM symbol transmitted by a transmitting end, and may be used when transmitting a data signal, similar to a demodulation reference signal, and may be transmitted after being precoded.

In the embodiment of the invention, the demodulation reference signal can be sent to the receiving end, and the phase tracking reference signal and the data signal are transmitted to the receiving end in a frequency division multiplexing mode, so that the receiving end can perform channel compensation on the channel information of the demodulation reference signal based on the phase tracking reference signal, and the phase noise of DFT-S-OFDM signal transmission can be reduced by using the compensated channel information to mediate the data signal. The specific process of the receiving end may be as follows:

After receiving the demodulation reference signal, the receiving end may perform channel estimation on the demodulation reference signal to obtain channel information of the demodulation reference signal, and after obtaining the phase tracking reference signal, may perform channel estimation on the phase tracking reference signal to obtain channel information of the phase tracking reference signal, so that the channel information of the demodulation reference signal may be compensated based on the channel information of the phase tracking reference signal to obtain compensated channel information and demodulate the data signal using the compensated channel information. Thus, since the data signal is demodulated using the compensation channel information, the phase noise can be reduced or even eliminated.

Optionally, in this embodiment of the present invention, the DFT-S-OFDM symbol where the phase tracking reference signal and the data signal are located and the DFT-S-OFDM symbol where the demodulation reference signal is located are different symbols.

In this embodiment, frequency division multiplexing transmission of DFT-S-OFDM symbols for the phase tracking reference signal and the data signal and DFT-S-OFDM symbols for the transmission demodulation reference signal can be implemented, which further reduces phase noise by estimating channel information of the phase tracking reference signal and the demodulation reference signal using the receiving end.

In addition, in the embodiment of the invention, the DFT-S-OFDM symbol is adopted, so that the effect of reducing the peak-to-average power ratio (PAPR) can be achieved.

Optionally, in this embodiment of the present invention, the transmitting end transmits a demodulation reference signal to a receiving end on a DFT-S-OFDM symbol, where the method includes:

The transforming the demodulation reference signals on the N subcarriers to the time domain may be transforming the demodulation reference signals on the N subcarriers to the time domain by using Inverse Fast Fourier Transform (IFFT) at K points, that is, the demodulation reference signals on the N subcarriers are transformed to the time domain by using IFFT at K points, and are sent to a receiving end, where K may be greater than or equal to N, for example: 16, 32, etc., without limitation. It should be noted that, in the embodiment of the present invention, time domain transformation using IFFT is not limited, and other transformation methods can be implemented as well.

In the receiving end, the receiving end may receive the demodulation reference signal transmitted by the transmitting end on the DFT-S-OFDM symbol, perform frequency domain transformation on the demodulation reference signal, and estimate channel information of the demodulation reference signal after the frequency domain transformation. The frequency domain transformation of the demodulation reference signal may be a frequency domain transformation by Fast Fourier Transform (FFT) of K points, that is, the demodulation reference signal is transformed to the frequency domain by the FFT of K points, and channel estimation is performed to obtain channel information of the demodulation reference signal.

Optionally, in this embodiment of the present invention, the transmitting end transmits a phase tracking reference signal and a data signal to the receiving end in a frequency division multiplexing manner on a DFT-S-OFDM symbol, including:

The M subcarriers may be one or more subcarriers, and preferably, the phase tracking reference signal may be mapped to 1 (i.e., M ═ 1) subcarrier of the N subcarriers of the DFT-S-OFDM symbol, so that transmission of a data signal may be increased, so as to improve utilization rate of resources. In addition, when T plus M is smaller than N, signals other than the phase tracking reference signal and the data signal may be multiplexed in the N subcarriers to improve flexibility of the system.

In addition, in the embodiment of the present invention, the M subcarriers may be dispersed in the N subcarriers, that is, one or more subcarriers of the N subcarriers other than the edge transmit the phase tracking reference signal. Or the M subcarriers may be collectively located at the edge of the N subcarriers, that is, one or more edge subcarriers of the N subcarriers transmit the phase tracking reference signal.

In addition, the time domain transformation may also be a transformation using K-point IFFT, which is not described herein again.

In this embodiment, the receiving end may receive the phase tracking reference signal and the data signal frequency-division multiplexed and transmitted on the DFT-S-OFDM symbol by the transmitting end, perform frequency domain transformation on the signal received on the DFT-S-OFDM symbol, and estimate channel information of the phase tracking reference signal after the frequency domain transformation.

Here, the frequency domain transformation may be a transformation by using a K-point FFT, and a channel estimation is performed on the transformed signal to obtain channel information of the phase tracking reference signal after the frequency domain transformation. The receiving end can obtain the channel information of the phase tracking reference signal in each DFT-S-OFDM symbol by adopting the mode aiming at each DFT-S-OFDM symbol multiplexing the phase tracking reference signal and the data signal.

performing serial-to-parallel conversion on the T modulation symbols of the data signal to obtain T parallel modulation symbols, performing Discrete Fourier Transform (DFT) on the T parallel modulation symbols to obtain T output data, and mapping the T output data to T subcarriers except the M subcarriers among the N subcarriers; or

In this embodiment, since the modulation symbols of the data signal are subjected to discrete fourier transform, a lower peak-to-average power ratio (PAPR) of the data signal is achieved to improve the transmission performance of the data signal. The selecting T output data from the N output data may be discarding M output data from the N output data, and selecting T output data.

Optionally, in the embodiment of the present invention, when a receiving end performs compensation on channel information of the demodulation reference signal, the receiving end compares the channel information of the phase tracking reference signal with the channel information of the demodulation reference signal to obtain phase change information of a DFT-S-OFDM symbol where the phase tracking reference signal and the data signal are located relative to the DFT-S-OFDM symbol where the demodulation reference signal is located, and compensates the channel information of the demodulation reference signal by using the phase change information to obtain compensated channel information.

Here, the DFT-S-OFDM symbol for transmitting the phase tracking reference signal and the data signal in frequency division multiplexing is used for explanation, and phase change information of the DFT-S-OFDM symbol where the phase tracking reference signal and the data signal are located relative to the DFT-S-OFDM symbol where the demodulation reference signal is located can be obtained through the above steps, that is, the phase change caused by the phase noise experienced by the DFT-S-OFDM signal can be obtained. Thus, the compensation channel information obtained by compensating the channel information of the demodulation reference signal by using the phase change information is used, and then the compensation channel information is used for demodulating the data signal in the DFT-S-OFDM symbol, thereby reducing or even eliminating the phase noise and improving the system performance. Other DFT-S-OFDM symbols may be demodulated in the same manner, which is not described herein.

Or the receiving end may receive the phase tracking reference signal and the data signal frequency division multiplexed and transmitted by the transmitting end on the plurality of DFT-S-OFDM symbols, perform frequency domain transformation on the signal received on each DFT-S-OFDM symbol in the plurality of DFT-S-OFDM symbols, and estimate channel information of the phase tracking reference signal in each DFT-S-OFDM symbol after the frequency domain transformation; comparing the channel information of the phase tracking reference signal in each DFT-S-OFDM symbol with the channel information of the demodulation reference signal to obtain the phase change information of each DFT-S-OFDM symbol relative to the DFT-S-OFDM symbol where the demodulation reference signal is located, and respectively compensating the channel information of the demodulation reference signal by using the phase change information corresponding to each DFT-S-OFDM symbol to obtain the compensation channel information corresponding to each DFT-S-OFDM symbol; and finally, demodulating respective data signals by using the compensation channel information corresponding to each DFT-S-OFDM symbol.

It should be noted that, a plurality of DFT-S-OFDM symbols are used for description here, but it is needless to say that in the embodiment of the present invention, the plurality of DFT-S-OFDM symbols are not limited to be performed simultaneously, and may be performed sequentially, and the embodiment of the present invention is not limited to this.

It should be noted that, in the embodiment of the present invention, various optional implementations described above may be implemented in combination with each other, or may be implemented separately, and the embodiment of the present invention is not limited thereto. For example: the following are examples:

the first embodiment is as follows:

for this example, it is assumed that the transmission bandwidth of the data signal at the transmitting end is N — 12 subcarriers, and the description is given in terms of one time unit (subframe), and fig. 3 shows the subframe configuration of this example.

In this example, a transmitting end transmits a DMRS on a DFT-S-OFDM symbol 3, as shown in fig. 3, where the DMRS is mapped to N-12 subcarriers, and is subjected to K-16-point IFFT to be transformed into a time domain, and then is transmitted to a receiving end.

And the transmitting end transmits the PTRS of the frequency division multiplexing and the modulation symbol of the data signal on the rest DFT-S-OFDM symbols (

symbols

1,2, 4-14). The PTRS signal is mapped onto M ═ 1 subcarriers, which are located on band edge subcarrier 1 as shown in fig. 3. And mapping 11 data modulation symbols to subcarriers 2-12 after 11-point DFT. And each symbol is subjected to IFFT conversion by K-16 points to a time domain and is sent to a receiving end.

As shown in fig. 4, a transmission structure diagram of the transmitting end may be that modulation symbols of the data signal are subjected to serial-to-parallel conversion, for example: obtaining 11 parallel modulation symbols, carrying out 11-point DFT conversion on the 11 parallel modulation symbols, then carrying out 16-point IFFT conversion on the 11 parallel modulation symbols and phase tracking reference signals to obtain a time domain, then carrying out parallel-serial conversion on the signals after the signals are converted to the time domain, adding cyclic prefix to the signals after the parallel-serial conversion, and then sending the signals to a receiving end through radio frequency.

In this example, each receiving antenna port or antenna unit at the receiving end may receive the PTRS signal on DFT-S-

OFDM symbols

1,2 and 4 to 14, and perform channel estimation. The result of channel estimation (channel information) of PTRS located on DFT-S-OFDM symbol l subcarrier k ═ 1 is denoted as P_1,l。

And each receiving antenna port or antenna unit of the receiving end receives the DMRS signal on the DFT-S-OFDM symbol 3 and carries out channel estimation. The result of channel estimation of DMRS located on DFT-S-OFDM symbol l ═ 3 subcarrier k is denoted as H_k,3。

Thus, the receiving end can estimate the phase change of the DFT-S-OFDM symbol (l is 1,2, 4-14) where the PTRS is located relative to the symbol where the DMRS is located according to the channel estimation result of the PTRS signal and the channel estimation result of the DMRS signal

I.e. P_1,lIs divided by H_k,3。

In addition, the receiver can use the estimated phase on the DFT-S-OFDM symbol lCompensating the channel estimation result of the DMRS symbol by the change to obtain the compensated channel estimation of each subcarrier on the symbol l

The data on the DFT-S-OFDM symbol l is demodulated using this compensated channel estimation result.

Example two:

this example assumes that the transmission bandwidth of data at the transmitting end is N ═ 12 subcarriers, and is explained in a time unit (subframe), and fig. 5 shows the subframe configuration of this embodiment.

In this example, the transmitting end may transmit a DMRS on DFT-S-OFDM symbol 3, as shown in fig. 5, where the DMRS is mapped to N-12 subcarriers, and is subjected to K-16-point IFFT to be transformed into a time domain, and then is transmitted to the receiving end.

The transmitting end transmits the DMRS on DFT-S-OFDM symbol 3, as shown in fig. 5, and maps the DMRS to N-12 subcarriers, and performs IFFT at K-16 points to a time domain, and transmits the DMRS to the receiving end.

And the transmitting end transmits the PTRS and the data modulation symbols of the frequency division multiplexing on the rest DFT-S-OFDM symbols (

symbols

1,2, 4-14). The PTRS signal is mapped onto M ═ 1 subcarriers, which is located on the center subcarrier 6 of the band as shown in fig. 5. 12 data modulation symbols are subjected to 12-point DFT to obtain 12 output data, 1 data is discarded, and the rest 11 data are mapped to subcarriers 1-5 and 7-12 respectively. And each symbol is subjected to IFFT conversion by K-16 points to a time domain and is sent to a receiving end.

As shown in fig. 6, a transmission structure diagram of a transmitting end may be that modulation symbols of a data signal are subjected to serial-to-parallel conversion, for example: obtaining 12 parallel modulation symbols, subjecting the 12 parallel modulation symbols to 12-point DFT (discrete Fourier transform) conversion, discarding 1 modulation symbol, subjecting the remaining 11 parallel modulation symbols and phase tracking reference signals to 16-point IFFT (inverse fast Fourier transform) conversion to a time domain, subjecting signals converted to the time domain to parallel-serial conversion, adding cyclic prefixes to the signals subjected to parallel-serial conversion, and sending the signals to a receiving end through radio frequency.

In this example, each receive antenna port or antenna element at the receive end may be at DFPTRS signals are received on T-S-

OFDM symbols

1,2 and 4-14, and channel estimation is carried out. The result of channel estimation of PTRS located on DFT-S-OFDM symbol l subcarrier k-6 is denoted as P_6,l。

Each receive antenna port or antenna element of the receive end receives the DMRS signal on DFT-S-OFDM symbol 3 and performs channel estimation. The result of channel estimation of DMRS located on DFT-S-OFDM symbol l ═ 3 subcarrier k is denoted as H_k,3。

Therefore, the receiving end can estimate the phase change of the DFT-S-OFDM symbol (l is 1,2, 4-14) where the PTRS is located relative to the symbol where the DMRS is located according to the channel estimation result of the PTRS signal and the channel estimation result of the DMRS signal

Therefore, the receiving end uses the estimated phase change on the DFT-S-OFDM symbol l to compensate the channel estimation result of the DMRS symbol, and the compensation channel estimation of each subcarrier on the symbol l is obtained

Referring to fig. 7, an embodiment of the present invention provides a method for transmitting a reference signal, as shown in fig. 7, including the following steps:

701. a receiving end receives a demodulation reference signal transmitted by a transmitting end on a DFT-S-OFDM symbol and estimates channel information of the demodulation reference signal;

702. the receiving end receives a phase tracking reference signal and a data signal which are transmitted by the transmitting end in a frequency division multiplexing mode on a DFT-S-OFDM symbol, and estimates channel information of the phase tracking reference signal;

703. the receiving end compensates the channel information of the demodulation reference signal based on the channel information of the phase tracking reference signal to obtain compensated channel information;

704. the receiving end demodulates the data signal using the compensation channel information.

It should be noted that, this embodiment is used as an implementation of the receiving end corresponding to the embodiment shown in fig. 2, and for a specific implementation of this embodiment, reference may be made to the relevant description of the embodiment shown in fig. 2, so as to avoid repeated description, and this embodiment is not described again. In this embodiment, the influence of the phase noise can be reduced as well.

Referring to fig. 8, an embodiment of the present invention provides a transmitting end, and as shown in fig. 8, a transmitting end 800 includes:

a first transmission module 801, configured to transmit a demodulation reference signal to a receiving end on a DFT-S-OFDM symbol;

a second transmission module 802, configured to transmit the phase tracking reference signal and the data signal to the receiving end in a frequency division multiplexing manner on the DFT-S-OFDM symbol.

Optionally, the first transmission module 801 is configured to map a demodulation reference signal to N subcarriers of a DFT-S-OFDM symbol, transform the demodulation reference signal on the N subcarriers to a time domain, and send the time domain to the receiving end, where N is the number of subcarriers of a transmission bandwidth.

Optionally, as shown in fig. 9, the second transmission module 802 includes:

a first mapping unit 8021, configured to map the phase tracking reference signal to M subcarriers of N subcarriers of a DFT-S-OFDM symbol;

a second mapping unit 8022, configured to map T modulation symbols of the data signal onto T subcarriers of the N subcarriers except for the M subcarriers;

a transforming unit 8023, configured to transform the phase tracking reference signal on M subcarriers and the modulation symbol on the T subcarriers to a time domain and send the time domain to the receiving end, where T plus M is less than or equal to N, where N is the number of subcarriers of a transmission bandwidth.

Optionally, the second mapping unit 8022 is configured to perform serial-to-parallel conversion on T modulation symbols of a data signal to obtain T parallel modulation symbols, perform discrete fourier transform on the T parallel modulation symbols to obtain T output data, and map the T output data to T subcarriers, except for the M subcarriers, of the N subcarriers; or

The second mapping unit 8022 is configured to perform serial-to-parallel conversion on N modulation symbols of a data signal to obtain N parallel modulation symbols, perform discrete fourier transform on the N parallel modulation symbols to obtain N output data, select T output data from the N output data, and map the T output data to T subcarriers, except the M subcarriers, of the N subcarriers.

It should be noted that, in this embodiment, the sending end 800 may be a sending end of any implementation manner in the method embodiment in the present invention, and any implementation manner of the sending end in the method embodiment in the present invention may be implemented by the sending end 800 in this embodiment, and the same beneficial effects are achieved, and details are not described here.

Referring to fig. 10, an embodiment of the present invention provides a receiving end, as shown in fig. 10, a receiving end 1000 includes:

a first receiving module 1001, configured to receive a demodulation reference signal transmitted by a transmitting end on a DFT-S-OFDM symbol, and estimate channel information of the demodulation reference signal;

a second receiving module 1002, configured to receive a phase tracking reference signal and a data signal frequency-division multiplexed and transmitted on a DFT-S-OFDM symbol by the sending end, and estimate channel information of the phase tracking reference signal;

a compensation module 1003, configured to compensate the channel information of the demodulation reference signal based on the channel information of the phase tracking reference signal, to obtain compensated channel information;

a demodulation module 1004 for demodulating the data signal using the compensated channel information.

Optionally, the first receiving module 1001 is configured to receive a demodulation reference signal transmitted on a DFT-S-OFDM symbol by a transmitting end, perform frequency domain transformation on the demodulation reference signal, and estimate channel information of the demodulation reference signal after the frequency domain transformation.

Optionally, the second receiving module 1002 is configured to receive a phase tracking reference signal and a data signal frequency-division multiplexed and transmitted on a DFT-S-OFDM symbol by the sending end, perform frequency domain transformation on the signal received on the DFT-S-OFDM symbol, and estimate channel information of the phase tracking reference signal after the frequency domain transformation.

Optionally, the compensation module 1003 is configured to compare the channel information of the phase tracking reference signal with the channel information of the demodulation reference signal, to obtain phase change information of the DFT-S-OFDM symbol where the phase tracking reference signal and the data signal are located relative to the DFT-S-OFDM symbol where the demodulation reference signal is located, and compensate the channel information of the demodulation reference signal by using the phase change information, to obtain compensation channel information.

Optionally, the second receiving module 1002 is configured to receive a phase tracking reference signal and a data signal, which are frequency-division multiplexed and transmitted by the sending end on a plurality of DFT-S-OFDM symbols, perform frequency domain transformation on a signal received on each DFT-S-OFDM symbol in the plurality of DFT-S-OFDM symbols, and estimate channel information of the phase tracking reference signal in each DFT-S-OFDM symbol after the frequency domain transformation;

the compensation module 1003 is configured to compare channel information of a phase tracking reference signal in each DFT-S-OFDM symbol with channel information of the demodulation reference signal, to obtain phase change information of each DFT-S-OFDM symbol relative to a DFT-S-OFDM symbol where the demodulation reference signal is located, and compensate the channel information of the demodulation reference signal by using the phase change information corresponding to each DFT-S-OFDM symbol, to obtain compensation channel information corresponding to each DFT-S-OFDM symbol;

the demodulation module 1004 is configured to demodulate the respective data signal using the compensation channel information corresponding to each DFT-S-OFDM symbol.

It should be noted that, in this embodiment, the receiving end 1000 may be a receiving end of any implementation manner in the method embodiment of the present invention, and any implementation manner of the receiving end in the method embodiment of the present invention may be implemented by the receiving end 1000 in this embodiment, so as to achieve the same beneficial effects, and details are not described here.

Referring to fig. 11, an embodiment of the present invention provides another structure of a transmitting end, where the transmitting end includes: a processor 1100, a transceiver 1110, a memory 1120, a user interface 1130, and a bus interface, wherein:

the processor 1100, which reads the program in the memory 1120, performs the following processes:

transmitting a demodulation reference signal to a receiving end on the DFT-S-OFDM symbol through the transceiver 1110;

the phase tracking reference signal and the data signal are transmitted to the receiving end through the transceiver 1110 over the DFT-S-OFDM symbol in a frequency division multiplexing manner.

Among other things, the transceiver 1110 is used for receiving and transmitting data under the control of the processor 1100.

In FIG. 11, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 1100, and various circuits of memory, represented by memory 1120, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1110 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. For different user devices, the user interface 1130 may also be an interface capable of interfacing with a desired device, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 1100 is responsible for managing the bus architecture and general processing, and the memory 1120 may store data used by the processor 1100 in performing operations.

Optionally, the transmitting the demodulation reference signal to the receiving end on the DFT-S-OFDM symbol includes:

mapping a demodulation reference signal to N subcarriers of a DFT-S-OFDM symbol, converting the demodulation reference signal on the N subcarriers to a time domain and sending the time domain to the receiving end, wherein N is the number of subcarriers of a transmission bandwidth.

Optionally, the transmitting the phase tracking reference signal and the data signal to the receiving end in a frequency division multiplexing manner on the DFT-S-OFDM symbol includes:

mapping the phase tracking reference signal to M subcarriers of N subcarriers of a DFT-S-OFDM symbol;

It should be noted that, in this embodiment, the sending end may be a sending end of any implementation manner in the method embodiment of the present invention, and any implementation manner of the sending end in the method embodiment of the present invention may be implemented by the sending end in this embodiment, and the same beneficial effects are achieved, and details are not described here.

Referring to fig. 12, there is shown a structure of a receiving end including: a processor 1200, a transceiver 1210, a memory 1220, a user interface 1230, and a bus interface, wherein:

a processor 1200 for reading the program in the memory 1220 and executing the following processes:

receiving, by a transceiver 1210, a demodulation reference signal transmitted on a DFT-S-OFDM symbol by a transmitting end, and estimating channel information of the demodulation reference signal;

receiving, by a transceiver 1210, a phase tracking reference signal and a data signal frequency-division multiplexed on a DFT-S-OFDM symbol by the transmitting end, and estimating channel information of the phase tracking reference signal;

compensating the channel information of the demodulation reference signal based on the channel information of the phase tracking reference signal to obtain compensated channel information;

demodulating the data signal using the compensated channel information.

The transceiver 1210 is configured to receive and transmit data under the control of the processor 1200, and the transceiver 1210 includes the antenna unit or the antenna port.

In fig. 12, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 1200 and memory represented by memory 1220. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1210 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. For different user devices, the user interface 1230 may also be an interface capable of interfacing with a desired device externally, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 1200 is responsible for managing the bus architecture and general processing, and the memory 1220 may store data used by the processor 1200 in performing operations.

Optionally, the receiving a demodulation reference signal transmitted by a transmitting end on a DFT-S-OFDM symbol, and estimating channel information of the demodulation reference signal includes:

and receiving a demodulation reference signal transmitted on a DFT-S-OFDM symbol by a transmitting end, carrying out frequency domain transformation on the demodulation reference signal, and estimating channel information of the demodulation reference signal after the frequency domain transformation.

Optionally, the receiving a phase tracking reference signal and a data signal frequency-division multiplexed on a DFT-S-OFDM symbol by the sending end, and estimating channel information of the phase tracking reference signal includes:

and receiving the phase tracking reference signal and the data signal which are subjected to frequency division multiplexing transmission on the DFT-S-OFDM symbol by the sending end, carrying out frequency domain transformation on the signal received on the DFT-S-OFDM symbol, and estimating the channel information of the phase tracking reference signal after the frequency domain transformation.

Optionally, the compensating the channel information of the demodulation reference signal based on the channel information of the phase tracking reference signal to obtain compensated channel information includes:

and comparing the channel information of the phase tracking reference signal with the channel information of the demodulation reference signal to obtain the phase change information of the DFT-S-OFDM symbol where the phase tracking reference signal and the data signal are located relative to the DFT-S-OFDM symbol where the demodulation reference signal is located, and compensating the channel information of the demodulation reference signal by using the phase change information to obtain compensation channel information.

receiving a phase tracking reference signal and a data signal which are subjected to frequency division multiplexing transmission on a plurality of DFT-S-OFDM symbols by the sending end, performing frequency domain transformation on the signal received on each DFT-S-OFDM symbol in the plurality of DFT-S-OFDM symbols, and estimating channel information of the phase tracking reference signal in each DFT-S-OFDM symbol after the frequency domain transformation;

the compensating the channel information of the demodulation reference signal based on the channel information of the phase tracking reference signal to obtain compensated channel information includes:

comparing the channel information of the phase tracking reference signal in each DFT-S-OFDM symbol with the channel information of the demodulation reference signal to obtain the phase change information of each DFT-S-OFDM symbol relative to the DFT-S-OFDM symbol where the demodulation reference signal is located, and respectively compensating the channel information of the demodulation reference signal by using the phase change information corresponding to each DFT-S-OFDM symbol to obtain the compensation channel information corresponding to each DFT-S-OFDM symbol;

the demodulating the data signal using the compensation channel information includes:

It should be noted that, in this embodiment, the receiving end may be a receiving end of any implementation manner in the method embodiment of the present invention, and any implementation manner of the receiving end in the method embodiment of the present invention may be implemented by the receiving end in this embodiment, so as to achieve the same beneficial effects, and details are not described here.

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

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute some steps of the transceiving method according to various embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for transmitting a reference signal, comprising:

a transmitting end transmits a demodulation reference signal to a receiving end on an orthogonal frequency division multiplexing access technology DFT-S-OFDM symbol of discrete Fourier transform spread spectrum;

a transmitting end transmits a phase tracking reference signal and a data signal to a receiving end in a frequency division multiplexing mode on a DFT-S-OFDM symbol;

wherein, the transmitting end transmits a phase tracking reference signal and a data signal to the receiving end in a frequency division multiplexing mode on a DFT-S-OFDM symbol, comprising:

2. The method of claim 1, wherein the DFT-S-OFDM symbol where the phase tracking reference signal and the data signal are located is a different symbol from the DFT-S-OFDM symbol where the demodulation reference signal is located.

3. The method of claim 1, wherein the transmitting end transmits a demodulation reference signal to a receiving end on DFT-S-OFDM symbols, comprising:

4. The method of claim 1, wherein said mapping T modulation symbols of a data signal onto T of said N subcarriers except for said M subcarriers comprises:

5. A method for transmitting a reference signal, comprising:

the receiving end demodulates the data signal by using the compensation channel information;

wherein, the receiving end receives the phase tracking reference signal and the data signal which are frequency division multiplexed and transmitted on the DFT-S-OFDM symbol by the transmitting end, and estimates the channel information of the phase tracking reference signal, and the method comprises the following steps:

6. The method of claim 5, wherein the DFT-S-OFDM symbol where the phase tracking reference signal and the data signal are located is a different symbol from the DFT-S-OFDM symbol where the demodulation reference signal is located.

7. The method of claim 5, wherein the receiving end receives a demodulation reference signal transmitted by a transmitting end on DFT-S-OFDM symbols and estimates channel information of the demodulation reference signal, comprising:

8. The method as claimed in any one of claims 5-7, wherein the receiving end compensates the channel information of the demodulation reference signal based on the channel information of the phase tracking reference signal to obtain compensated channel information, and comprises:

9. The method as claimed in any one of claims 5-7, wherein the receiving end receives a phase tracking reference signal and a data signal frequency division multiplexed by the transmitting end on DFT-S-OFDM symbols, and estimates channel information of the phase tracking reference signal, comprising:

10. A transmitting end, comprising:

a second transmission module, configured to transmit a phase tracking reference signal and a data signal to the receiving end in a frequency division multiplexing manner on a DFT-S-OFDM symbol;

wherein the second transmission module comprises:

11. The transmission end of claim 10, wherein the DFT-S-OFDM symbol where the phase tracking reference signal and the data signal are located is a different symbol from the DFT-S-OFDM symbol where the demodulation reference signal is located.

12. The transmitting end of claim 10, wherein the first transmission module is configured to map demodulation reference signals onto N subcarriers of a DFT-S-OFDM symbol, transform the demodulation reference signals on the N subcarriers into a time domain, and transmit the time domain to the receiving end, where N is the number of subcarriers of a transmission bandwidth.

13. The transmitting end according to claim 10, wherein the second mapping unit is configured to perform serial-to-parallel conversion on T modulation symbols of a data signal to obtain T parallel modulation symbols, perform discrete fourier transform on the T parallel modulation symbols to obtain T output data, and map the T output data to T subcarriers, excluding the M subcarriers, of the N subcarriers; or

14. A receiving end, comprising:

a demodulation module for demodulating the data signal using the compensation channel information;

the second receiving module is configured to receive a phase tracking reference signal and a data signal, which are frequency division multiplexed and transmitted on a DFT-S-OFDM symbol by the transmitting end, perform frequency domain transformation on the signal received on the DFT-S-OFDM symbol, and estimate channel information of the phase tracking reference signal after the frequency domain transformation.

15. The receiving end of claim 14, wherein the DFT-S-OFDM symbol where the phase tracking reference signal and the data signal are located is a different symbol from the DFT-S-OFDM symbol where the demodulation reference signal is located.

16. The receiving end of claim 14, wherein the first receiving module is configured to receive a demodulation reference signal transmitted by a transmitting end on a DFT-S-OFDM symbol, perform frequency domain transformation on the demodulation reference signal, and estimate channel information of the frequency domain transformed demodulation reference signal.

17. The receiving end according to any of claims 14-16, wherein the compensation module is configured to compare the channel information of the phase tracking reference signal with the channel information of the demodulation reference signal to obtain phase variation information of the DFT-S-OFDM symbol where the phase tracking reference signal and the data signal are located relative to the DFT-S-OFDM symbol where the demodulation reference signal is located, and compensate the channel information of the demodulation reference signal by using the phase variation information to obtain compensated channel information.

18. The receiving end of any one of claims 14-16, wherein the second receiving module is configured to receive a phase tracking reference signal and a data signal frequency-division multiplexed and transmitted by the transmitting end on a plurality of DFT-S-OFDM symbols, perform frequency domain transformation on the signal received on each DFT-S-OFDM symbol in the plurality of DFT-S-OFDM symbols, and estimate channel information of the phase tracking reference signal in each DFT-S-OFDM symbol after the frequency domain transformation;