CN110557347B - Channel estimation method and communication equipment - Google Patents

Abstract

The invention provides a channel estimation method and communication equipment, and relates to the technical field of communication. The channel estimation method is applied to a receiving end and comprises the following steps: acquiring an original channel response estimated by a DMRS (demodulation reference signal) port by using a DMRS (demodulation reference signal); according to a phase tracking reference signal PTRS of a DMRS port configured at a sending end, obtaining the phase noise offset of each OFDM symbol relative to the OFDM symbol at a preset position, and removing the phase noise offset in the original channel response estimated by using the DMRS; carrying out equalization filtering processing on the channel response with the phase noise offset removed to obtain the channel response after the equalization filtering processing; and performing phase noise offset compensation on the channel response subjected to the equalization filtering processing to obtain the channel response subjected to the phase noise offset compensation. According to the scheme, the PTRS configured for the DMRS port is used, the phase noise offset is removed before the equalization filtering, and the phase noise offset compensation is performed after the equalization filtering, so that the performance of the phase noise compensation is guaranteed, and the reliability of communication is guaranteed.

Description

Channel estimation method and communication equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a channel estimation method and a communication device.

Background

The phase noise is from local oscillators in the transmitter and the receiver, which will affect the transmission of the multi-carrier signal, and at high frequency band (above 6 GHz), the effect of the phase noise will be more serious, and the phase noise compensation for the received signal is needed to ensure the system performance.

In a New Radio (NR) system, a Phase-Tracking Reference signal (PT-RS) is used to compensate for Phase noise. However, because of the existence of phase noise, it is necessary to consider the effect of removing the phase noise before performing equalization filtering on a channel estimated by a Demodulation Reference Signals (DMRS), and the existing phase noise compensation scheme does not consider the effect of the phase noise on the equalization filtering. Equalization filtering cannot be performed due to the presence of phase noise.

Disclosure of Invention

The embodiment of the invention provides a channel estimation method and communication equipment, aiming at solving the problem that balanced filtering cannot be realized due to the existence of phase noise.

In order to solve the above technical problem, an embodiment of the present invention provides a channel estimation method, applied to a receiving end, including:

acquiring an original channel response estimated by a DMRS (demodulation reference signal) port by using a DMRS (demodulation reference signal);

according to a phase tracking reference signal PTRS of a DMRS port configured at a sending end, obtaining the phase noise offset of each OFDM symbol relative to the OFDM symbol at a preset position, and removing the phase noise offset in the original channel response estimated by using the DMRS;

carrying out equalization filtering processing on the channel response with the phase noise offset removed to obtain the channel response after the equalization filtering processing;

and performing phase noise offset compensation on the channel response subjected to the equalization filtering processing to obtain the channel response subjected to the phase noise offset compensation.

Further, the step of obtaining a phase noise offset of each OFDM symbol relative to an OFDM symbol at a preset position according to a phase tracking reference signal PTRS of a DMRS port configured at a transmitting end, and removing the phase noise offset in an original channel response estimated by using the DMRS includes:

acquiring a channel response of a preset DMRS port estimated by using a PTRS;

obtaining the phase noise offset of each OFDM symbol relative to the OFDM symbol at the preset position according to the channel response estimated by using the PTRS;

determining the phase noise offset of the OFDM symbol in which each DMRS is located relative to the OFDM symbol in the preset position according to the phase noise offset of each OFDM symbol relative to the OFDM symbol in the preset position;

and removing the phase noise offset in the original channel response to obtain the channel response after the phase noise offset is removed.

Further, the step of obtaining a channel response of the preset DMRS port estimated by using the PTRS includes:

according to the formula:

acquiring a channel response estimated by using the PTRS;

wherein the content of the first and second substances,

xth corresponding to pth DMRS port_aY of one OFDM symbol_bChannel response estimated by PTRS on PTRS resource elements RE of the subcarriers;

receiving the data corresponding to the p-th DMRS port at the x-th port for a receiving end_aY of one OFDM symbol_bFrequency domain signals on PTRS REs of subcarriers;

the x th port corresponding to the p th DMRS port is taken as a transmitting terminal_aY of one OFDM symbol_bPTRS configured by PTRS RE of the subcarriers; x is the number of_aAn index of an OFDM symbol is defined, and a is 0,1, … …, a-1, where a is the number of OFDM symbols occupied by a PTRS configured for the pth DMRS port on each resource block RB; y is_bIs the index of the subcarrier, and B is 0,1, … …, B-1, B is the number of subcarriers occupied within the configured operating bandwidth of the PTRS configured for the pth DMRS port.

Further, the step of obtaining a phase noise offset of each OFDM symbol with respect to an OFDM symbol at a preset position according to a channel response estimated using the PTRS includes:

according to the channel response estimated by using the PTRS, acquiring the phase noise offset of the OFDM symbol of the target position of each PTRS relative to the OFDM symbol of the preset position;

setting the phase noise offset of the OFDM symbol at the preset position to zero relative to the OFDM symbol at the preset position;

and combining the phase noise offset of the OFDM symbol at the target position of each PTRS relative to the OFDM symbol at the preset position with the phase noise offset of the OFDM symbol at the preset position relative to the OFDM symbol at the preset position to obtain combined phase noise offset, and performing linear interpolation on the combined phase noise offset to obtain the phase noise offset of each OFDM symbol relative to the OFDM symbol at the preset position.

Further, the step of obtaining the phase noise offset of the OFDM symbol at the target position of each PTRS with respect to the OFDM symbol at the preset position according to the channel response estimated by using the PTRS includes:

according to the formula:

acquiring the phase noise offset of the OFDM symbol where each PTRS is located relative to the OFDM symbol at the preset position;

wherein, Delta theta_PTRS(x_a) Is the x_aOne PTRS symbol relative to the l-th₀Phase noise offset of individual DMRS symbols;

xth corresponding to pth DMRS port_aY of one OFDM symbol_bChannel response estimated by PTRS on PTRS RE of the subcarrier;

for the ith DMRS port₀Y of one OFDM symbol_bChannel responses estimated using the DMRS on the DMRS REs of the subcarriers; x is the number of_aThe index is an index of an OFDM symbol, and a is 0,1, … …, a-1, where a denotes the number of OFDM symbols occupied by a PTRS signal configured for the pth DMRS port on each resource block RB; y is_bIs an index of a subcarrier, and B is 0,1, … …, B-1, B denotes the number of subcarriers occupied within the configured operating bandwidth of the PTRS configured for the pth DMRS port; l₀Is an index of an OFDM symbol of a predetermined position, and₀∈[0,L-1]l represents the total number of occupied OFDM symbols;arg () is an angle function.

Further, the step of removing the phase noise offset in the original channel response and obtaining the channel response after removing the phase noise offset includes:

according to the formula:

acquiring channel response after removing phase noise offset;

wherein the content of the first and second substances,

for the ith DMRS port_mKth of OFDM symbol_nChannel response after phase noise is removed on the DMRS RE of the subcarrier by utilizing DMRS estimation;

for the ith DMRS port_mKth of OFDM symbol_nOriginal channel response estimated by the DMRS on the DMRS RE of the sub-carrier; j is a preset complex value; delta theta (l)_m) Is the first_mPhase noise offset of the OFDM symbols relative to OFDM symbols at preset positions; exp () is an exponential function with a natural constant e as the base.

Further, the step of performing phase noise offset compensation on the channel response subjected to the equalization filtering processing to obtain a channel response subjected to the phase noise offset compensation includes:

according to the formula:

acquiring channel response after phase noise offset compensation;

wherein H^p(k, l) is the channel response after phase noise offset compensation;

the channel response after the equalization filtering processing is carried out; j is a preset complex value; delta theta (l) is OF OF each OFDM symbol with respect to a preset positionPhase noise offset of the DM symbol;

indicating the number of subcarriers included in each RB; n is a radical of^RBThe number of RBs configured for the receiving end; l is 0,1, … …, L-1, L represents the total number of occupied OFDM symbols; exp () is an exponential function with a natural constant e as the base.

The embodiment of the invention also provides communication equipment, which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the communication equipment is used as a receiving end in the communication process; wherein the processor implements the following steps when executing the computer program:

acquiring an original channel response estimated by a DMRS (demodulation reference signal) port by using a DMRS (demodulation reference signal);

according to a phase tracking reference signal PTRS of a DMRS port configured at a sending end, obtaining the phase noise offset of each OFDM symbol relative to the OFDM symbol at a preset position, and removing the phase noise offset in the original channel response estimated by using the DMRS;

carrying out equalization filtering processing on the channel response with the phase noise offset removed to obtain the channel response after the equalization filtering processing;

and performing phase noise offset compensation on the channel response subjected to the equalization filtering processing to obtain the channel response subjected to the phase noise offset compensation.

Further, the processor, when executing the computer program, implements the steps of:

acquiring a channel response of a preset DMRS port estimated by using a PTRS;

obtaining the phase noise offset of each OFDM symbol relative to the OFDM symbol at the preset position according to the channel response estimated by using the PTRS;

determining the phase noise offset of the OFDM symbol in which each DMRS is located relative to the OFDM symbol in the preset position according to the phase noise offset of each OFDM symbol relative to the OFDM symbol in the preset position;

and removing the phase noise offset in the original channel response to obtain the channel response after the phase noise offset is removed.

Further, the processor, when executing the computer program, implements the steps of:

according to the formula:

acquiring a channel response estimated by using the PTRS;

wherein the content of the first and second substances,

xth corresponding to pth DMRS port_aY of one OFDM symbol_bChannel response estimated by PTRS on PTRS resource elements RE of the subcarriers;

receiving the data corresponding to the p-th DMRS port at the x-th port for a receiving end_aY of one OFDM symbol_bFrequency domain signals on PTRS REs of subcarriers;

the x th port corresponding to the p th DMRS port is taken as a transmitting terminal_aY of one OFDM symbol_bPTRS configured by PTRS RE of the subcarriers; x is the number of_aAn index of an OFDM symbol is defined, and a is 0,1, … …, a-1, where a is the number of OFDM symbols occupied by a PTRS configured for the pth DMRS port on each resource block RB; y is_bIs the index of the subcarrier, and B is 0,1, … …, B-1, B is the number of subcarriers occupied within the configured operating bandwidth of the PTRS configured for the pth DMRS port.

Further, the processor, when executing the computer program, implements the steps of:

according to the channel response estimated by using the PTRS, acquiring the phase noise offset of the OFDM symbol of the target position of each PTRS relative to the OFDM symbol of the preset position;

setting the phase noise offset of the OFDM symbol at the preset position to zero relative to the OFDM symbol at the preset position;

and combining the phase noise offset of the OFDM symbol at the target position of each PTRS relative to the OFDM symbol at the preset position with the phase noise offset of the OFDM symbol at the preset position relative to the OFDM symbol at the preset position to obtain combined phase noise offset, and performing linear interpolation on the combined phase noise offset to obtain the phase noise offset of each OFDM symbol relative to the OFDM symbol at the preset position.

Further, the processor, when executing the computer program, implements the steps of:

according to the formula:

acquiring the phase noise offset of the OFDM symbol where each PTRS is located relative to the OFDM symbol at the preset position;

wherein, Delta theta_PTRS(x_a) Is the x_aOne PTRS symbol relative to the l-th₀Phase noise offset of individual DMRS symbols;

xth corresponding to pth DMRS port_aY of one OFDM symbol_bChannel response estimated by PTRS on PTRS RE of the subcarrier;

for the ith DMRS port₀Y of one OFDM symbol_bChannel responses estimated using the DMRS on the DMRS REs of the subcarriers; x is the number of_aThe index is an index of an OFDM symbol, and a is 0,1, … …, a-1, where a denotes the number of OFDM symbols occupied by a PTRS signal configured for the pth DMRS port on each resource block RB; y is_bIs an index of a subcarrier, and B is 0,1, … …, B-1, B denotes the number of subcarriers occupied within the configured operating bandwidth of the PTRS configured for the pth DMRS port; l₀Is an index of an OFDM symbol of a predetermined position, and₀∈[0,L-1]l represents the total number of occupied OFDM symbols; arg () is an angle function.

Further, the processor, when executing the computer program, implements the steps of:

according to the formula:

acquiring channel response after removing phase noise offset;

wherein the content of the first and second substances,

for the ith DMRS port_mKth of OFDM symbol_nChannel response after phase noise is removed on the DMRS RE of the subcarrier by utilizing DMRS estimation;

for the ith DMRS port_mKth of OFDM symbol_nOriginal channel response estimated by the DMRS on the DMRS RE of the sub-carrier; j is a preset complex value; delta theta (l)_m) Is the first_mPhase noise offset of the OFDM symbols relative to OFDM symbols at preset positions; exp () is an exponential function with a natural constant e as the base.

Further, the processor, when executing the computer program, implements the steps of:

according to the formula:

acquiring channel response after phase noise offset compensation;

wherein H^p(k, l) is the channel response after phase noise offset compensation;

the channel response after the equalization filtering processing is carried out; j is a preset complex value; Δ θ (l) is a phase noise offset of each OFDM symbol with respect to an OFDM symbol of a preset position;

indicating the number of subcarriers included in each RB; n is a radical of^RBThe number of RBs configured for the receiving end; l is 0,1, … …, L-1, L represents the total number of occupied OFDM symbols; exp () is in natureConstant e is an exponential function of the base.

An embodiment of the present invention further provides a communication device, where the communication device serves as a receiving end in a communication process, and the communication device includes:

the device comprises an acquisition module, a demodulation reference signal (DMRS) estimation module and a demodulation reference signal (DMRS) estimation module, wherein the acquisition module is used for acquiring an original channel response estimated by a DMRS port of a preset DMRS;

the processing module is used for tracking a reference signal PTRS according to the phase of a DMRS port configured at the sending end, obtaining the phase noise offset of each OFDM symbol relative to the OFDM symbol at a preset position, and removing the phase noise offset in the original channel response estimated by using the DMRS;

the filtering module is used for carrying out equalization filtering processing on the channel response with the phase noise offset removed to obtain the channel response after the equalization filtering processing;

and the compensation module is used for performing phase noise offset compensation on the channel response subjected to the equalization filtering processing to obtain the channel response subjected to the phase noise offset compensation.

Further, the processing module includes:

the first obtaining submodule is used for obtaining the channel response of a preset DMRS port estimated by using the PTRS;

the second obtaining submodule is used for obtaining the phase noise offset of each OFDM symbol relative to the OFDM symbol at the preset position according to the channel response estimated by using the PTRS;

the determining submodule is used for determining the phase noise offset of the OFDM symbol in which each DMRS is located relative to the OFDM symbol in the preset position according to the phase noise offset of each OFDM symbol relative to the OFDM symbol in the preset position;

and the third obtaining submodule is used for removing the phase noise offset in the original channel response and obtaining the channel response after the phase noise offset is removed.

Further, the first obtaining sub-module is configured to:

according to the formula:

obtaining information estimated using PTRSA track response;

wherein the content of the first and second substances,

xth corresponding to pth DMRS port_aY of one OFDM symbol_bChannel response estimated by PTRS on PTRS resource elements RE of the subcarriers;

receiving the data corresponding to the p-th DMRS port at the x-th port for a receiving end_aY of one OFDM symbol_bFrequency domain signals on PTRS REs of subcarriers;

the x th port corresponding to the p th DMRS port is taken as a transmitting terminal_aY of one OFDM symbol_bPTRS configured by PTRS RE of the subcarriers; x is the number of_aAn index of an OFDM symbol is defined, and a is 0,1, … …, a-1, where a is the number of OFDM symbols occupied by a PTRS configured for the pth DMRS port on each resource block RB; y is_bIs the index of the subcarrier, and B is 0,1, … …, B-1, B is the number of subcarriers occupied within the configured operating bandwidth of the PTRS configured for the pth DMRS port.

Further, the second obtaining sub-module includes:

the first obtaining unit is used for obtaining the phase noise offset of the OFDM symbol of the target position of each PTRS relative to the OFDM symbol of the preset position according to the channel response estimated by using the PTRS;

a setting unit, configured to set a phase noise offset of the OFDM symbol at the preset position to zero with respect to the OFDM symbol at the preset position;

and the second obtaining unit is used for combining the phase noise offset of the OFDM symbol at the target position of each PTRS relative to the OFDM symbol at the preset position with the phase noise offset of the OFDM symbol at the preset position relative to the OFDM symbol at the preset position to obtain combined phase noise offset, and performing linear interpolation on the combined phase noise offset to obtain the phase noise offset of each OFDM symbol relative to the OFDM symbol at the preset position.

Further, the first obtaining unit is configured to:

according to the formula:

acquiring the phase noise offset of the OFDM symbol where each PTRS is located relative to the OFDM symbol at the preset position;

wherein, Delta theta_PTRS(x_a) Is the x_aOne PTRS symbol relative to the l-th₀Phase noise offset of individual DMRS symbols;

xth corresponding to pth DMRS port_aY of one OFDM symbol_bChannel response estimated by PTRS on PTRS RE of the subcarrier;

for the ith DMRS port₀Y of one OFDM symbol_bChannel responses estimated using the DMRS on the DMRS REs of the subcarriers; x is the number of_aThe index is an index of an OFDM symbol, and a is 0,1, … …, a-1, where a denotes the number of OFDM symbols occupied by a PTRS signal configured for the pth DMRS port on each resource block RB; y is_bIs an index of a subcarrier, and B is 0,1, … …, B-1, B denotes the number of subcarriers occupied within the configured operating bandwidth of the PTRS configured for the pth DMRS port; l₀Is an index of an OFDM symbol of a predetermined position, and₀∈[0,L-1]l represents the total number of occupied OFDM symbols; arg () is an angle function.

Further, the third obtaining sub-module is configured to:

according to the formula:

acquiring channel response after removing phase noise offset;

wherein the content of the first and second substances,

for the p < th > DML-th corresponding to RS port_mKth of OFDM symbol_nChannel response after phase noise is removed on the DMRS RE of the subcarrier by utilizing DMRS estimation;

for the ith DMRS port_mKth of OFDM symbol_nOriginal channel response estimated by the DMRS on the DMRS RE of the sub-carrier; j is a preset complex value; delta theta (l)_m) Is the first_mPhase noise offset of the OFDM symbols relative to OFDM symbols at preset positions; exp () is an exponential function with a natural constant e as the base.

Further, the compensation module is configured to:

according to the formula:

acquiring channel response after phase noise offset compensation;

wherein H^p(k, l) is the channel response after phase noise offset compensation;

the channel response after the equalization filtering processing is carried out; j is a preset complex value; Δ θ (l) is a phase noise offset of each OFDM symbol with respect to an OFDM symbol of a preset position;

indicating the number of subcarriers included in each RB; n is a radical of^RBThe number of RBs configured for the receiving end; l is 0,1, … …, L-1, L represents the total number of occupied OFDM symbols; exp () is an exponential function with a natural constant e as the base.

Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the above-mentioned channel estimation method.

The invention has the beneficial effects that:

according to the scheme, the PTRS configured for the DMRS port is used, the phase noise offset is removed before balanced filtering, and finally the phase noise offset is compensated after balanced filtering, so that the performance of phase noise compensation is guaranteed, and the reliability of communication is guaranteed.

Drawings

Fig. 1 is a flow chart illustrating a channel estimation method according to an embodiment of the present invention;

fig. 2 shows DMRS configuration type 1 and low density (L)_PT-RS4) PTRS configuration schematic;

fig. 3 shows DMRS configuration type2 and low density (L)_PT-RS4) PTRS configuration schematic;

fig. 4 shows DMRS configuration type 1 and low density (L)_PT-RS4) a schematic diagram of DMRS RE positions and PTRS RE positions after DMRS OCC despreading when an antenna port p is 0 in PTRS configuration;

fig. 5 shows DMRS configuration type2 and low density (L)_PT-RS4) a schematic diagram of DMRS RE positions and PTRS RE positions after DMRS OCC despreading when an antenna port p is 0 in PTRS configuration;

FIG. 6 shows a block diagram of a communication device of an embodiment of the invention;

fig. 7 is a schematic structural diagram of a communication device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

The invention provides a channel estimation method and communication equipment aiming at the problems that the influence of phase noise on equalization filtering is not considered in the existing phase noise compensation scheme, and equalization filtering cannot be carried out due to the existence of the phase noise.

Specifically, as shown in fig. 1, an embodiment of the present invention provides a channel estimation method, applied to a receiving end, including:

step 11, acquiring an original channel response estimated by a preset demodulation reference signal DMRS port by using a DMRS;

it should be noted that, in the embodiment of the present invention, the receiving end needs to receive the DMRS sent by the sending end to perform channel estimation. Assuming that the transmitting end has a plurality of DMRS ports (i.e., antenna ports), each DMRS port is configured with a corresponding DMRS, and in order to implement subsequent determination of phase noise offset by using a Phase Tracking Reference Signal (PTRS), the transmitting end further configures a corresponding PTRS for each DMRS port, and because the processing manners of each DMRS port are the same, in this embodiment, processing of one port is taken as an example, and the preset DMRS port in step 11 refers to one DMRS port among the plurality of DMRS ports.

Step 12, according to the phase tracking reference signal PTRS of the DMRS port configured at the sending end, obtaining the phase noise offset of each OFDM symbol relative to the OFDM symbol at the preset position, and removing the phase noise offset in the original channel response estimated by using the DMRS;

step 13, performing equalization filtering processing on the channel response with the phase noise offset removed to obtain the channel response after the equalization filtering processing;

and step 14, performing phase noise offset compensation on the channel response subjected to the equalization filtering processing to obtain the channel response subjected to the phase noise offset compensation.

According to the scheme of the embodiment of the invention, the PTRS configured for the DMRS port is utilized, the phase noise offset is removed before the equalization filtering, and finally the compensation of the phase noise offset is carried out after the equalization filtering, so that the performance of the phase noise compensation is ensured.

The DMRS transmission by the transmitting end is explained as follows, the transmitting end configures a DMRS for the pth DMRS port, and configures a PTRS for the pth DMRS port, and for a DMRS configuration type (configuration type)1, the DMRS configuration type is associated with a low density (L)_PT-RS4) PTRS configuration example is shown in fig. 2, where left diagonal line padding boxes corresponding to the 2 nd and 9 th OFDM symbols are represented as DMRS Resource Elements (REs) set for ports 0 and 1, right diagonal line padding boxes corresponding to the 2 nd and 9 th OFDM symbols are represented as DMRS REs set for ports 2 and 3, and horizontal and vertical grid padding boxes, diagonal grid padding boxes, horizontal line padding boxes, and vertical line padding boxes corresponding to the 4 th, 8 th, and 12 th OFDM symbols are respectively port 0, port 3, and port c,PTRS RE set at port 1, port 2 and port 3; for DMRS configuration type2, it is associated with a low density (L)_PT-RS4) PTRS configuration example is shown in fig. 3, where corresponding left diagonal line filling boxes on the 2 nd and 9 th OFDM symbols represent DMRS REs set for ports 0 and 1, corresponding right diagonal line filling boxes on the 2 nd and 9 th OFDM symbols represent DMRS REs set for ports 2 and 3, corresponding thick horizontal line filling boxes on the 2 nd and 9 th OFDM symbols represent DMRS REs set for ports 4 and 5, and corresponding horizontal and vertical grid filling boxes, diagonal grid filling boxes, horizontal line filling boxes, vertical line filling boxes, gray point filling boxes, and black point filling boxes on the 4 th, 8 th, and 12 th OFDM symbols represent PTRS set for ports 0,1, 2, 3, 4, and 5, respectively.

Further, when the receiving end executes step 11, specifically: configuring corresponding DMRS signals for the pth DMRS port according to the sending end to obtain the lth DMRS port corresponding to the pth DMRS port_mKth of OFDM symbol_nChannel response estimated on the sub-carriers' DMRS REs using DMRS as

The

Is the original channel response; l_mThe position of an OFDM symbol corresponding to the pth DMRS port is, where M is 0,1, … …, and M-1, where M is the number of occupied OFDM symbols, and a value of M is related to a standard, and may be 1, 2, 3, or 4; k is a radical of_nSetting N as 0,1, … …, and N-1 for the position of the subcarrier corresponding to the pth DMRS port, where N is the number of occupied subcarriers, its value and DMRS configuration type, and the number N of configured Resource Blocks (RBs)^RBIn connection with this, the present invention is,

N^RBthe number of RBs configured for the receiving end,

DMRS occupancy after Orthogonal Cover Code (OCC) despreading on each RBNumber of subcarriers of (1), wherein

In relation to the DMRS configuration type, when it is configured as type 1,

taking 3, when it is configured as type2,

and taking 2.

Taking the antenna port p as 0 as an example, after the DMRS OCC is despread, the channel response is estimated by the DMRS

The time-frequency location on the 0 th RB is shown in fig. 4 and 5. In case of DMRS configuration type 1,

k_ncomprises the following steps: k is a radical of₀＝0，k₁＝4，k ₂8, and M2, l_mComprises the following steps: l₀＝2，l ₁9. In case of DMRS configuration type2,

wherein k is_nComprises the following steps: k is a radical of₀＝0，k ₁6, and, M is 2, wherein l_mComprises the following steps: l₀＝2，l₁＝9。

Specifically, the implementation manner of step 12 in the embodiment of the present invention includes the following steps:

step 121, acquiring a channel response of a preset DMRS port estimated by using a PTRS;

the specific implementation manner of step 121 is: according to the formula:

acquiring a channel response estimated by using the PTRS;

wherein the content of the first and second substances,

xth corresponding to pth DMRS port_aY of one OFDM symbol_bChannel response estimated by PTRS on PTRS RE of the subcarrier;

receiving the data corresponding to the p-th DMRS port at the x-th port for a receiving end_aY of one OFDM symbol_bFrequency domain signals on PTRS REs of subcarriers;

the x th port corresponding to the p th DMRS port is taken as a transmitting terminal_aY of one OFDM symbol_bPTRS configured by PTRS RE of the subcarriers; x is the number of_aAn index of an OFDM symbol is defined, and a is 0,1, … …, a-1, where a is the number of OFDM symbols occupied by a PTRS configured for the pth DMRS port on each resource block RB; y is_bIs the index of the subcarrier, and B is 0,1, … …, B-1, B is the number of subcarriers occupied within the configured operating bandwidth of the PTRS configured for the pth DMRS port.

Take antenna port p-0 as an example, which obtains the channel response from the PTRS estimation

The time-frequency location on the 0 th RB is shown in fig. 4 and 5. In case of DMRS configuration type 1, y₀＝0，A＝3，x_aIs x₀＝4，x₁＝8，x₂12. In case of DMRS configuration type2, y₀＝0，A＝3，x_aIs x₀＝4，x₁＝8，x₂＝12。

Step 122, obtaining the phase noise offset of each OFDM symbol relative to the OFDM symbol at the preset position according to the channel response estimated by using the PTRS;

specifically, the specific way to acquire the phase noise offset in step 122 is as follows: according to the channel response estimated by using the PTRS, acquiring the phase noise offset of the OFDM symbol of the target position of each PTRS relative to the OFDM symbol of the preset position; setting the phase noise offset of the OFDM symbol at the preset position to zero relative to the OFDM symbol at the preset position; and combining the phase noise offset of the OFDM symbol at the target position of each PTRS relative to the OFDM symbol at the preset position with the phase noise offset of the OFDM symbol at the preset position relative to the OFDM symbol at the preset position to obtain combined phase noise offset, and performing linear interpolation on the combined phase noise offset to obtain the phase noise offset of each OFDM symbol relative to the OFDM symbol at the preset position.

It should be noted that the OFDM symbol of the preset position is referred to as the l-th symbol₀An OFDM symbol, in particular according to the formula:

acquiring the phase noise offset of the OFDM symbol where each PTRS is located relative to the OFDM symbol at the preset position;

wherein, Delta theta_PTRS(x_a) Is the x_aOne PTRS symbol relative to the l-th₀Phase noise offset of individual DMRS symbols;

xth corresponding to pth DMRS port_aY of one OFDM symbol_bChannel response estimated by PTRS on PTRS RE of the subcarrier;

for the ith DMRS port₀Y of one OFDM symbol_bChannel responses estimated using the DMRS on the DMRS REs of the subcarriers; x is the number of_aThe index is an index of an OFDM symbol, and a is 0,1, … …, a-1, where a denotes the number of OFDM symbols occupied by a PTRS signal configured for the pth DMRS port on each resource block RB; y is_bIs an index of a subcarrier, and B is 0,1, … …, B-1, B denotes the number of subcarriers occupied within the configured operating bandwidth of the PTRS configured for the pth DMRS port; l₀Is an index of an OFDM symbol of a predetermined position, and₀∈[0,L-1]l represents the total number of occupied OFDM symbols; arg () is the angle function, y_b∈[k₀,k_N-1]Wherein k is_nIs the sub-carrier position where the DMRS RE is located. The PTRS estimated phase noise offset delta theta is then shifted_PTRS(x_a) (wherein, x_a∈[0,L-1]) And l₀Phase noise offset of DMRS estimation over OFDM symbols Δ θ_DMRS(l₀) (wherein. DELTA. theta.)_DMRS(l₀)＝0，l₀∈[0,L-1]) Are combined together to form

Wherein C is 0,1, … …, C-1, C is A +1, q_c∈[0,L-1](ii) a Last pair of

Linear interpolation is performed to obtain a phase noise offset Δ θ (L) over L OFDM symbols (where L is 0,1, … …, L-1).

Step 123, determining the phase noise offset of the OFDM symbol in which each DMRS is located relative to the OFDM symbol in the preset position according to the phase noise offset of each OFDM symbol relative to the OFDM symbol in the preset position;

it should be noted that after the phase noise offset of each OFDM symbol relative to the OFDM symbol at the preset position is obtained, the phase noise offset of the OFDM symbol at which each DMRS is located relative to the OFDM symbol at the preset position only needs to be found out from the phase noise offsets.

Step 124, removing the phase noise offset in the original channel response, and obtaining the channel response after removing the phase noise offset;

specifically, the specific implementation manner of step 124 is:

according to the formula:

acquiring channel response after removing phase noise offset;

wherein the content of the first and second substances,

for the ith DMRS port_mKth of OFDM symbol_nChannel response after phase noise is removed on the DMRS RE of the subcarrier by utilizing DMRS estimation;

for the ith DMRS port_mKth of OFDM symbol_nOriginal channel response estimated by the DMRS on the DMRS RE of the sub-carrier; j is a preset complex value; delta theta (l)_m) Is the first_mPhase noise offset of the OFDM symbols relative to OFDM symbols at preset positions; exp () is an exponential function with a natural constant e as the base.

It should be noted that, through the above steps, a channel response of a port with phase noise offset removed can be obtained, and then a channel estimated by using the DMRS with phase noise offset removed is used

Carrying out equalization filtering to obtain

Channel of one carrier and L OFDM symbols

Wherein the content of the first and second substances,

l is 0,1, … …, L-1. Wherein L is 14.

Indicates the number of subcarriers included in each RB, and

N^RBnumber of RBs configured for the receiving end, N^RBRelated to the configured channel bandwidth.

It should be noted that the equalization filtering algorithm is not limited to MMSE1D1D filtering, MMSE2D filtering, MMSE1DLS filtering or LS (Least Squre Least squares) filtering, etc.; wherein, the MMSE1D1D filtering is that MMSE (Minimum Mean Square Error) filtering is respectively carried out on frequency domain and time domain; MMSE2D filtering means that MMSE filtering is carried out in a frequency domain and a time domain simultaneously; MMSE1DLS frequency domain is subjected to MMSE filtering, and time domain is subjected to linear interpolation or copying; the LS filtering means linear interpolation or duplication of the frequency domain and the time domain respectively.

After performing the equalization filtering, the phase noise offset compensation is performed, and the specific implementation manner is as follows:

according to the formula:

acquiring channel response after phase noise offset compensation;

wherein H^p(k, l) is the channel response after phase noise offset compensation;

the channel response after the equalization filtering processing is carried out; j is a preset complex value; Δ θ (l) is a phase noise offset of each OFDM symbol with respect to an OFDM symbol of a preset position.

After the channel response after the phase noise offset compensation is obtained, the data transmitted by the p-th port can be demodulated by using the channel response after the phase noise offset compensation.

It should be noted that, the embodiment of the present invention provides a method for compensating phase noise by using DMRS and PT-RS simultaneously, so as to ensure performance of phase noise compensation and reliability of communication.

As shown in fig. 6, an embodiment of the present invention provides a communication device 60, which serves as a receiving end in a communication process, and specifically, the communication device is a network side device or a terminal, and includes:

an obtaining module 61, configured to obtain an original channel response estimated by using a DMRS through a preset demodulation reference signal DMRS port;

the processing module 62 is configured to track the reference signal PTRS according to a phase of the DMRS port configured at the transmitting end, obtain a phase noise offset of each OFDM symbol relative to an OFDM symbol at a preset position, and remove the phase noise offset in the original channel response estimated by using the DMRS;

the filtering module 63 is configured to perform equalization filtering processing on the channel response from which the phase noise offset is removed, so as to obtain a channel response after the equalization filtering processing;

and the compensation module 64 is configured to perform phase noise offset compensation on the channel response after the equalization filtering processing is performed, so as to obtain a channel response after the phase noise offset compensation.

Further, the processing module 62 includes:

the first obtaining submodule is used for obtaining the channel response of a preset DMRS port estimated by using the PTRS;

the second obtaining submodule is used for obtaining the phase noise offset of each OFDM symbol relative to the OFDM symbol at the preset position according to the channel response estimated by using the PTRS;

the determining submodule is used for determining the phase noise offset of the OFDM symbol in which each DMRS is located relative to the OFDM symbol in the preset position according to the phase noise offset of each OFDM symbol relative to the OFDM symbol in the preset position;

and the third obtaining submodule is used for removing the phase noise offset in the original channel response and obtaining the channel response after the phase noise offset is removed.

Specifically, the first obtaining sub-module is configured to:

according to the formula:

acquiring a channel response estimated by using the PTRS;

wherein the content of the first and second substances,

xth corresponding to pth DMRS port_aY of one OFDM symbol_bChannel response estimated by PTRS on PTRS resource elements RE of the subcarriers;

receiving the data corresponding to the p-th DMRS port at the x-th port for a receiving end_aY of one OFDM symbol_bFrequency domain signals on PTRS REs of subcarriers;

the x th port corresponding to the p th DMRS port is taken as a transmitting terminal_aY of one OFDM symbol_bPTRS configured by PTRS RE of the subcarriers; x is the number of_aAn index of an OFDM symbol is defined, and a is 0,1, … …, a-1, where a is the number of OFDM symbols occupied by a PTRS configured for the pth DMRS port on each resource block RB; y is_bIs the index of the subcarrier, and B is 0,1, … …, B-1, B is the number of subcarriers occupied within the configured operating bandwidth of the PTRS configured for the pth DMRS port.

Specifically, the second obtaining sub-module includes:

the first obtaining unit is used for obtaining the phase noise offset of the OFDM symbol of the target position of each PTRS relative to the OFDM symbol of the preset position according to the channel response estimated by using the PTRS;

a setting unit, configured to set a phase noise offset of the OFDM symbol at the preset position to zero with respect to the OFDM symbol at the preset position;

and the second obtaining unit is used for combining the phase noise offset of the OFDM symbol at the target position of each PTRS relative to the OFDM symbol at the preset position with the phase noise offset of the OFDM symbol at the preset position relative to the OFDM symbol at the preset position to obtain combined phase noise offset, and performing linear interpolation on the combined phase noise offset to obtain the phase noise offset of each OFDM symbol relative to the OFDM symbol at the preset position.

Specifically, the first obtaining unit is configured to:

according to the formula:

acquiring the phase noise offset of the OFDM symbol where each PTRS is located relative to the OFDM symbol at the preset position;

wherein, Delta theta_PTRS(x_a) Is the x_aOne PTRS symbol relative to the l-th₀Phase noise offset of individual DMRS symbols;

xth corresponding to pth DMRS port_aY of one OFDM symbol_bChannel response estimated by PTRS on PTRS RE of the subcarrier;

for the ith DMRS port₀Y of one OFDM symbol_bChannel responses estimated using the DMRS on the DMRS REs of the subcarriers; x is the number of_aThe index is an index of an OFDM symbol, and a is 0,1, … …, a-1, where a denotes the number of OFDM symbols occupied by a PTRS signal configured for the pth DMRS port on each resource block RB; y is_bIs an index of a subcarrier, and B is 0,1, … …, B-1, B denotes the number of subcarriers occupied within the configured operating bandwidth of the PTRS configured for the pth DMRS port; l₀Is an index of an OFDM symbol of a predetermined position, and₀∈[0,L-1]l represents the total number of occupied OFDM symbols; arg () is an angle function.

Specifically, the third obtaining sub-module is configured to:

according to the formula:

acquiring channel response after removing phase noise offset;

wherein the content of the first and second substances,

for the ith DMRS port_mKth of OFDM symbol_nChannel response after phase noise is removed on the DMRS RE of the subcarrier by utilizing DMRS estimation;

for the ith DMRS port_mKth of OFDM symbol_nOriginal channel response estimated by the DMRS on the DMRS RE of the sub-carrier; j is a preset complex value; delta theta (l)_m) Is the first_mPhase noise offset of the OFDM symbols relative to OFDM symbols at preset positions; exp () is an exponential function with a natural constant e as the base.

Further, the compensation module is configured to:

according to the formula:

acquiring channel response after phase noise offset compensation;

wherein H^p(k, l) is the channel response after phase noise offset compensation;

the channel response after the equalization filtering processing is carried out; j is a preset complex value; Δ θ (l) is a phase noise offset of each OFDM symbol with respect to an OFDM symbol of a preset position;

indicating the number of subcarriers included in each RB; n is a radical of^RBThe number of RBs configured for the receiving end; l is 0,1, … …, L-1, L represents the total number of occupied OFDM symbols; exp () is an exponential function with a natural constant e as the base.

It should be noted that the embodiment of the communication device is a communication device corresponding to the embodiment of the method one to one, and all implementation manners in the embodiment of the method are applicable to the embodiment of the communication device, and the same technical effect can be achieved.

As shown in fig. 7, the embodiment of the present invention further provides a communication device 70, which includes a processor 71, a transceiver 72, a memory 73, and a computer program stored on the memory 73 and operable on the processor 71; the transceiver 72 is connected to the processor 71 and the memory 73 through a bus interface, wherein the processor 71 is configured to read a program in the memory, and execute the following processes:

acquiring an original channel response estimated by a DMRS (demodulation reference signal) port by using a DMRS (demodulation reference signal);

according to a phase tracking reference signal PTRS of a DMRS port configured at a sending end, obtaining the phase noise offset of each OFDM symbol relative to the OFDM symbol at a preset position, and removing the phase noise offset in the original channel response estimated by using the DMRS;

carrying out equalization filtering processing on the channel response with the phase noise offset removed to obtain the channel response after the equalization filtering processing;

and performing phase noise offset compensation on the channel response subjected to the equalization filtering processing to obtain the channel response subjected to the phase noise offset compensation.

It should be noted that in fig. 7, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 71 and various circuits of memory represented by memory 73 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 72 may be a number of elements including a transmitter and a transceiver providing a means for communicating with various other apparatus over a transmission medium. The processor 71 is responsible for managing the bus architecture and general processing for the different terminals, and the memory 73 may store data used by the processor 71 in performing the operations.

Optionally, the processor, when executing the computer program, implements the following steps:

acquiring a channel response of a preset DMRS port estimated by using a PTRS;

obtaining the phase noise offset of each OFDM symbol relative to the OFDM symbol at the preset position according to the channel response estimated by using the PTRS;

determining the phase noise offset of the OFDM symbol in which each DMRS is located relative to the OFDM symbol in the preset position according to the phase noise offset of each OFDM symbol relative to the OFDM symbol in the preset position;

and removing the phase noise offset in the original channel response to obtain the channel response after the phase noise offset is removed.

The processor, when executing the computer program, implements the steps of:

according to the formula:

acquiring a channel response estimated by using the PTRS;

wherein the content of the first and second substances,

xth corresponding to pth DMRS port_aY of one OFDM symbol_bChannel response estimated by PTRS on PTRS resource elements RE of the subcarriers;

receiving the data corresponding to the p-th DMRS port at the x-th port for a receiving end_aY of one OFDM symbol_bFrequency domain signals on PTRS REs of subcarriers;

the x th port corresponding to the p th DMRS port is taken as a transmitting terminal_aY of one OFDM symbol_bPTRS configured by PTRS RE of the subcarriers; x is the number of_aAn index of an OFDM symbol is defined, and a is 0,1, … …, a-1, where a is the number of OFDM symbols occupied by a PTRS configured for the pth DMRS port on each resource block RB; y is_bIs the index of the subcarrier, and B is 0,1, … …, B-1, B is the number of subcarriers occupied within the configured operating bandwidth of the PTRS configured for the pth DMRS port.

Optionally, the processor, when executing the computer program, implements the following steps:

according to the channel response estimated by using the PTRS, acquiring the phase noise offset of the OFDM symbol of the target position of each PTRS relative to the OFDM symbol of the preset position;

setting the phase noise offset of the OFDM symbol at the preset position to zero relative to the OFDM symbol at the preset position;

and combining the phase noise offset of the OFDM symbol at the target position of each PTRS relative to the OFDM symbol at the preset position with the phase noise offset of the OFDM symbol at the preset position relative to the OFDM symbol at the preset position to obtain combined phase noise offset, and performing linear interpolation on the combined phase noise offset to obtain the phase noise offset of each OFDM symbol relative to the OFDM symbol at the preset position.

Optionally, the processor, when executing the computer program, implements the following steps:

according to the formula:

acquiring the phase noise offset of the OFDM symbol where each PTRS is located relative to the OFDM symbol at the preset position;

wherein, Delta theta_PTRS(x_a) Is the x_aOne PTRS symbol relative to the l-th₀Phase noise offset of individual DMRS symbols;

xth corresponding to pth DMRS port_aY of one OFDM symbol_bChannel response estimated by PTRS on PTRS RE of the subcarrier;

for the ith DMRS port₀Y of one OFDM symbol_bChannel responses estimated using the DMRS on the DMRS REs of the subcarriers; x is the number of_aThe index is an index of an OFDM symbol, and a is 0,1, … …, a-1, where a denotes the number of OFDM symbols occupied by a PTRS signal configured for the pth DMRS port on each resource block RB; y is_bIs an index of a subcarrier, and B is 0,1, … …, B-1, B denotes the number of subcarriers occupied within the configured operating bandwidth of the PTRS configured for the pth DMRS port; l₀Is an index of an OFDM symbol of a predetermined position, and₀∈[0,L-1]l represents the total number of occupied OFDM symbols; arg () is an angle function.

Optionally, the processor, when executing the computer program, implements the following steps:

according to the formula:

acquiring channel response after removing phase noise offset;

wherein the content of the first and second substances,

for the ith DMRS port_mKth of OFDM symbol_nChannel response after phase noise is removed on the DMRS RE of the subcarrier by utilizing DMRS estimation;

for the ith DMRS port_mKth of OFDM symbol_nOriginal channel response estimated by the DMRS on the DMRS RE of the sub-carrier; j is a preset complex value; delta theta (l)_m) Is the first_mPhase noise offset of the OFDM symbols relative to OFDM symbols at preset positions; exp () is an exponential function with a natural constant e as the base.

Optionally, the processor, when executing the computer program, implements the following steps:

according to the formula:

acquiring channel response after phase noise offset compensation;

wherein H^p(k, l) is the channel response after phase noise offset compensation;

the channel response after the equalization filtering processing is carried out; j is a preset complex value; Δ θ (l) is a phase noise offset of each OFDM symbol with respect to an OFDM symbol of a preset position;

indicating the number of subcarriers included in each RB; n is a radical of^RBThe number of RBs configured for the receiving end; l is 0,1, … …, L-1, L represents the total number of occupied OFDM symbols; exp () is an exponential function with a natural constant e as the base.

An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the above-mentioned channel estimation method.

The communication device mentioned above may be a terminal or a network side device. The network side device may be a Base Transceiver Station (BTS) in Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA), a Base Station (NodeB, NB) in Wideband Code Division Multiple Access (WCDMA), an evolved Node B (evolved Node B, eNB or eNodeB) in LTE, a relay Station or Access point, or a Base Station in a future 5G network, and the like, which is not limited herein.

While the preferred embodiments of the present invention have been described, 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 following claims.

Claims (22)

1. A channel estimation method applied to a receiving end is characterized by comprising the following steps:

acquiring an original channel response estimated by a DMRS (demodulation reference signal) port by using a DMRS (demodulation reference signal);

according to a phase tracking reference signal PTRS of a DMRS port configured at a sending end, obtaining the phase noise offset of each OFDM symbol relative to the OFDM symbol at a preset position, and removing the phase noise offset in the original channel response estimated by using the DMRS;

carrying out equalization filtering processing on the channel response with the phase noise offset removed to obtain the channel response after the equalization filtering processing;

and performing phase noise offset compensation on the channel response subjected to the equalization filtering processing to obtain the channel response subjected to the phase noise offset compensation.

2. The channel estimation method according to claim 1, wherein the step of obtaining a phase noise offset of each OFDM symbol relative to an OFDM symbol at a preset position according to the phase tracking reference signal PTRS of the DMRS port configured at the transmitting end, and removing the phase noise offset in the original channel response estimated by using the DMRS comprises:

acquiring a channel response of a preset DMRS port estimated by using a PTRS;

obtaining the phase noise offset of each OFDM symbol relative to the OFDM symbol at the preset position according to the channel response estimated by using the PTRS;

determining the phase noise offset of the OFDM symbol in which each DMRS is located relative to the OFDM symbol in the preset position according to the phase noise offset of each OFDM symbol relative to the OFDM symbol in the preset position;

and removing the phase noise offset in the original channel response to obtain the channel response after the phase noise offset is removed.

3. The channel estimation method according to claim 2, wherein the step of obtaining the channel response estimated by the PTRS of the preset DMRS port comprises:

according to the formula:

acquiring a channel response estimated by using the PTRS;

wherein the content of the first and second substances,

xth corresponding to pth DMRS port_aY of one OFDM symbol_bChannel response estimated by PTRS on PTRS resource elements RE of the subcarriers;

receiving the data corresponding to the p-th DMRS port at the x-th port for a receiving end_aY of one OFDM symbol_bFrequency domain signals on PTRSRE of subcarriers;

the x th port corresponding to the p th DMRS port is taken as a transmitting terminal_aY of one OFDM symbol_bPTRS configured by PTRS RE of the subcarriers; x is the number of_aAn index of an OFDM symbol is defined, and a is 0,1, … …, a-1, where a is the number of OFDM symbols occupied by a PTRS configured for the pth DMRS port on each resource block RB; y is_bIs the index of the subcarrier, and B is 0,1, … …, B-1, B is the number of subcarriers occupied within the configured operating bandwidth of the PTRS configured for the pth DMRS port.

4. The channel estimation method according to claim 2, wherein the step of obtaining the phase noise offset of each OFDM symbol with respect to the OFDM symbol at the preset position according to the channel response estimated by using PTRS comprises:

according to the channel response estimated by using the PTRS, acquiring the phase noise offset of the OFDM symbol of the target position of each PTRS relative to the OFDM symbol of the preset position;

setting the phase noise offset of the OFDM symbol at the preset position relative to the OFDM symbol at the preset position to be zero;

and combining the phase noise offset of the OFDM symbol at the target position of each PTRS relative to the OFDM symbol at the preset position with the phase noise offset of the OFDM symbol at the preset position relative to the OFDM symbol at the preset position to obtain combined phase noise offset, and performing linear interpolation on the combined phase noise offset to obtain the phase noise offset of each OFDM symbol relative to the OFDM symbol at the preset position.

5. The channel estimation method according to claim 4, wherein the step of obtaining the phase noise offset of the OFDM symbol at the target position relative to the OFDM symbol at the preset position according to the channel response estimated by using the PTRS comprises:

according to the formula:

acquiring the phase noise offset of the OFDM symbol where each PTRS is located relative to the OFDM symbol at the preset position;

wherein, Delta theta_PTRS(x_a) Is the x_aOne PTRS symbol relative to the l-th₀DMRSPhase noise offset of the symbol;

xth corresponding to pth DMRS port_aY of one OFDM symbol_bChannel response estimated by PTRS on PTRS RE of the subcarrier;

for the ith DMRS port₀Y of one OFDM symbol_bChannel responses estimated using the DMRS on the DMRS REs of the subcarriers; x is the number of_aThe index is an index of an OFDM symbol, and a is 0,1, … …, a-1, where a denotes the number of OFDM symbols occupied by a PTRS signal configured for the pth DMRS port on each resource block RB; y is_bIs an index of a subcarrier, and B is 0,1, … …, B-1, B denotes the number of subcarriers occupied within the configured operating bandwidth of the PTRS configured for the pth DMRS port; l₀Is an index of an OFDM symbol of a predetermined position, and₀∈[0,L-1]l represents the total number of occupied OFDM symbols; arg () is an angle function.

6. The channel estimation method according to claim 2, wherein the step of removing the phase noise offset from the original channel response and obtaining the channel response after removing the phase noise offset comprises:

according to the formula:

acquiring channel response after removing phase noise offset;

wherein the content of the first and second substances,

for the ith DMRS port_mKth of OFDM symbol_nChannel response after phase noise is removed on the DMRS RE of the subcarrier by utilizing DMRS estimation;

for the ith DMRS port_mKth of OFDM symbol_nOriginal channel response estimated by the DMRS on the DMRS RE of the sub-carrier; j is a preset complex value; delta theta (l)_m) Is the first_mPhase noise offset of the OFDM symbols relative to OFDM symbols at preset positions; exp () is an exponential function with a natural constant e as the base.

7. The channel estimation method according to claim 2, wherein the step of performing phase noise offset compensation on the channel response after the equalization filtering process to obtain the channel response after the phase noise offset compensation comprises:

according to the formula:

acquiring channel response after phase noise offset compensation;

wherein H^p(k, l) is the channel response after phase noise offset compensation;

the channel response after the equalization filtering processing is carried out; j is a preset complex value; Δ θ (l) is a phase noise offset of each OFDM symbol with respect to an OFDM symbol of a preset position;

indicating the number of subcarriers included in each RB; n is a radical of^RBThe number of RBs configured for the receiving end; l is 0,1, … …, L-1, L represents the total number of occupied OFDM symbols; exp () is an exponential function with a natural constant e as the base.

8. A communication device comprising a memory, a processor and a computer program stored on said memory and executable on said processor, said communication device acting as a receiving end during a communication; wherein the processor implements the following steps when executing the computer program:

acquiring an original channel response estimated by a DMRS (demodulation reference signal) port by using a DMRS (demodulation reference signal);

according to a phase tracking reference signal PTRS of a DMRS port configured at a sending end, obtaining the phase noise offset of each OFDM symbol relative to the OFDM symbol at a preset position, and removing the phase noise offset in the original channel response estimated by using the DMRS;

carrying out equalization filtering processing on the channel response with the phase noise offset removed to obtain the channel response after the equalization filtering processing;

and performing phase noise offset compensation on the channel response subjected to the equalization filtering processing to obtain the channel response subjected to the phase noise offset compensation.

9. The communication device according to claim 8, wherein the processor when executing the computer program performs the steps of:

acquiring a channel response of a preset DMRS port estimated by using a PTRS;

obtaining the phase noise offset of each OFDM symbol relative to the OFDM symbol at the preset position according to the channel response estimated by using the PTRS;

determining the phase noise offset of the OFDM symbol in which each DMRS is located relative to the OFDM symbol in the preset position according to the phase noise offset of each OFDM symbol relative to the OFDM symbol in the preset position;

and removing the phase noise offset in the original channel response to obtain the channel response after the phase noise offset is removed.

10. The communication device according to claim 9, wherein the processor when executing the computer program performs the steps of:

according to the formula:

obtaining utilizing PTRS estimatesThe channel response of (a);

wherein the content of the first and second substances,

xth corresponding to pth DMRS port_aY of one OFDM symbol_bChannel response estimated by PTRS on PTRS resource elements RE of the subcarriers;

receiving the data corresponding to the p-th DMRS port at the x-th port for a receiving end_aY of one OFDM symbol_bFrequency domain signals on PTRSRE of subcarriers;

the x th port corresponding to the p th DMRS port is taken as a transmitting terminal_aY of one OFDM symbol_bPTRS configured by PTRS RE of the subcarriers; x is the number of_aAn index of an OFDM symbol is defined, and a is 0,1, … …, a-1, where a is the number of OFDM symbols occupied by a PTRS configured for the pth DMRS port on each resource block RB; y is_bIs the index of the subcarrier, and B is 0,1, … …, B-1, B is the number of subcarriers occupied within the configured operating bandwidth of the PTRS configured for the pth DMRS port.

11. The communication device according to claim 9, wherein the processor when executing the computer program performs the steps of:

according to the channel response estimated by using the PTRS, acquiring the phase noise offset of the OFDM symbol of the target position of each PTRS relative to the OFDM symbol of the preset position;

setting the phase noise offset of the OFDM symbol at the preset position relative to the OFDM symbol at the preset position to be zero;

and combining the phase noise offset of the OFDM symbol at the target position of each PTRS relative to the OFDM symbol at the preset position with the phase noise offset of the OFDM symbol at the preset position relative to the OFDM symbol at the preset position to obtain combined phase noise offset, and performing linear interpolation on the combined phase noise offset to obtain the phase noise offset of each OFDM symbol relative to the OFDM symbol at the preset position.

12. The communication device according to claim 11, wherein the processor when executing the computer program performs the steps of:

according to the formula:

acquiring the phase noise offset of the OFDM symbol where each PTRS is located relative to the OFDM symbol at the preset position;

wherein, Delta theta_PTRS(x_a) Is the x_aOne PTRS symbol relative to the l-th₀Phase noise offset of individual DMRS symbols;

xth corresponding to pth DMRS port_aY of one OFDM symbol_bChannel response estimated by PTRS on PTRS RE of the subcarrier;

for the ith DMRS port₀Y of one OFDM symbol_bChannel responses estimated using the DMRS on the DMRS REs of the subcarriers; x is the number of_aThe index is an index of an OFDM symbol, and a is 0,1, … …, a-1, where a denotes the number of OFDM symbols occupied by a PTRS signal configured for the pth DMRS port on each resource block RB; y is_bIs an index of a subcarrier, and B is 0,1, … …, B-1, B denotes the number of subcarriers occupied within the configured operating bandwidth of the PTRS configured for the pth DMRS port; l₀Is an index of an OFDM symbol of a predetermined position, and₀∈[0,L-1]l represents the total number of occupied OFDM symbols; arg () is an angle function.

13. The communication device according to claim 9, wherein the processor when executing the computer program performs the steps of:

according to the formula:

acquiring channel response after removing phase noise offset;

wherein the content of the first and second substances,

for the ith DMRS port_mKth of OFDM symbol_nChannel response after phase noise is removed on the DMRS RE of the subcarrier by utilizing DMRS estimation;

for the ith DMRS port_mKth of OFDM symbol_nOriginal channel response estimated by the DMRS on the DMRS RE of the sub-carrier; j is a preset complex value; delta theta (l)_m) Is the first_mPhase noise offset of the OFDM symbols relative to OFDM symbols at preset positions; exp () is an exponential function with a natural constant e as the base.

14. The communication device according to claim 9, wherein the processor when executing the computer program performs the steps of:

according to the formula:

acquiring channel response after phase noise offset compensation;

wherein H^p(k, l) is the channel response after phase noise offset compensation;

the channel response after the equalization filtering processing is carried out; j is a preset complex value; Δ θ (l) is a phase noise offset of each OFDM symbol with respect to an OFDM symbol of a preset position;

indicating the number of subcarriers included in each RB; n is a radical of^RBThe number of RBs configured for the receiving end; l is 0,1, … …, L-1, L represents the total number of occupied OFDM symbols; exp () is an exponential function with a natural constant e as the base.

15. A communication device that operates as a receiving end during communication, comprising:

the device comprises an acquisition module, a demodulation reference signal (DMRS) estimation module and a demodulation reference signal (DMRS) estimation module, wherein the acquisition module is used for acquiring an original channel response estimated by a DMRS port of a preset DMRS;

the processing module is used for tracking a reference signal PTRS according to the phase of a DMRS port configured at the sending end, obtaining the phase noise offset of each OFDM symbol relative to the OFDM symbol at a preset position, and removing the phase noise offset in the original channel response estimated by using the DMRS;

the filtering module is used for carrying out equalization filtering processing on the channel response with the phase noise offset removed to obtain the channel response after the equalization filtering processing;

and the compensation module is used for performing phase noise offset compensation on the channel response subjected to the equalization filtering processing to obtain the channel response subjected to the phase noise offset compensation.

16. The communications device of claim 15, wherein the processing module comprises:

the first obtaining submodule is used for obtaining the channel response of a preset DMRS port estimated by using the PTRS;

the second obtaining submodule is used for obtaining the phase noise offset of each OFDM symbol relative to the OFDM symbol at the preset position according to the channel response estimated by using the PTRS;

the determining submodule is used for determining the phase noise offset of the OFDM symbol in which each DMRS is located relative to the OFDM symbol in the preset position according to the phase noise offset of each OFDM symbol relative to the OFDM symbol in the preset position;

and the third obtaining submodule is used for removing the phase noise offset in the original channel response and obtaining the channel response after the phase noise offset is removed.

17. The communications device of claim 16, wherein the first obtaining sub-module is configured to:

according to the formula:

acquiring a channel response estimated by using the PTRS;

wherein the content of the first and second substances,

xth corresponding to pth DMRS port_aY of one OFDM symbol_bChannel response estimated by PTRS on PTRS resource elements RE of the subcarriers;

receiving the data corresponding to the p-th DMRS port at the x-th port for a receiving end_aY of one OFDM symbol_bFrequency domain signals on PTRSRE of subcarriers;

the x th port corresponding to the p th DMRS port is taken as a transmitting terminal_aY of one OFDM symbol_bPTRS configured by PTRS RE of the subcarriers; x is the number of_aAn index of an OFDM symbol is defined, and a is 0,1, … …, a-1, where a is the number of OFDM symbols occupied by a PTRS configured for the pth DMRS port on each resource block RB; y is_bIs the index of the subcarrier, and B is 0,1, … …, B-1, B is the number of subcarriers occupied within the configured operating bandwidth of the PTRS configured for the pth DMRS port.

18. The communications device of claim 16, wherein the second acquisition sub-module comprises:

the first obtaining unit is used for obtaining the phase noise offset of the OFDM symbol of the target position of each PTRS relative to the OFDM symbol of the preset position according to the channel response estimated by using the PTRS;

a setting unit, configured to set a phase noise offset of the OFDM symbol at the preset position to zero with respect to the OFDM symbol at the preset position;

and the second obtaining unit is used for combining the phase noise offset of the OFDM symbol at the target position of each PTRS relative to the OFDM symbol at the preset position with the phase noise offset of the OFDM symbol at the preset position relative to the OFDM symbol at the preset position to obtain a combined phase noise offset, and performing linear interpolation on the combined phase noise offset to obtain the phase noise offset of each OFDM symbol relative to the OFDM symbol at the preset position.

19. The communications device of claim 18, wherein the first obtaining unit is configured to:

according to the formula:

acquiring the phase noise offset of the OFDM symbol where each PTRS is located relative to the OFDM symbol at the preset position;

wherein, Delta theta_PTRS(x_a) Is the x_aOne PTRS symbol relative to the l-th₀Phase noise offset of individual DMRS symbols;

xth corresponding to pth DMRS port_aY of one OFDM symbol_bChannel response estimated by PTRS on PTRS RE of the subcarrier;

for the ith DMRS port₀Y of one OFDM symbol_bChannel responses estimated using the DMRS on the DMRS REs of the subcarriers; x is the number of_aThe index is an index of an OFDM symbol, and a is 0,1, … …, a-1, where a denotes the number of OFDM symbols occupied by a PTRS signal configured for the pth DMRS port on each resource block RB; y is_bIs a sub-carrierThe index of a wave, and B is 0,1, … …, B-1, B denotes the number of subcarriers occupied within the configured operating bandwidth of the PTRS configured for the pth DMRS port; l₀Is an index of an OFDM symbol of a predetermined position, and₀∈[0,L-1]l represents the total number of occupied OFDM symbols; arg () is an angle function.

20. The communications device of claim 16, wherein the third obtaining sub-module is configured to:

according to the formula:

acquiring channel response after removing phase noise offset;

wherein the content of the first and second substances,

for the ith DMRS port_mKth of OFDM symbol_nChannel response after phase noise is removed on the DMRS RE of the subcarrier by utilizing DMRS estimation;

for the ith DMRS port_mKth of OFDM symbol_nOriginal channel response estimated by the DMRS on the DMRS RE of the sub-carrier; j is a preset complex value; delta theta (l)_m) Is the first_mPhase noise offset of the OFDM symbols relative to OFDM symbols at preset positions; exp () is an exponential function with a natural constant e as the base.

21. The communications device of claim 16, wherein the compensation module is configured to:

according to the formula:

acquiring channel response after phase noise offset compensation;

wherein Hp (k, l) is the phase noise offset compensated channelResponding;

the channel response after the equalization filtering processing is carried out; j is a preset complex value; Δ θ (l) is a phase noise offset of each OFDM symbol with respect to an OFDM symbol of a preset position;

indicating the number of subcarriers included in each RB; n is a radical of^RBThe number of RBs configured for the receiving end; l is 0,1, … …, L-1, L represents the total number of occupied OFDM symbols; exp () is an exponential function with a natural constant e as the base.

22. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the channel estimation method according to any one of claims 1 to 7.

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