Wireless communication device for channel estimation and method of operation of wireless communication device

Abstract

A wireless communication device for channel estimation and a method of operation of the wireless communication device are provided. A method of operation of a wireless communication device may include obtaining a first pilot signal and a second pilot signal, estimating an autocorrelation in a frequency domain of the first pilot signal based on a power delay profile of the second pilot signal, generating a channel estimation weight based on the autocorrelation, and estimating a channel of the data signal based on the channel estimation weight and the first pilot signal.

Description

[0001] Cross-reference to related applications

[0002] This application is based on and claims priority to Korean Patent Application No. 10-2024-0064148 and No. 10-2024-0093335, filed with the Korean Intellectual Property Office on May 16, 2024 and July 15, 2024, respectively, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] One or more embodiments of this disclosure relate to a wireless communication device and a method of operating the same, and more specifically, to a wireless communication device and a method of operating the wireless communication device for performing channel estimation by using a power delay distribution. Background Technology

[0004] In many communication systems, including 5G and 6G systems, wireless communication devices such as base stations and terminals can receive signals and demodulate and decode the received signals to detect transmitted data. These devices can receive reference signals and generate power delay distributions from them. For example, a wireless communication device can receive multiple reference signals and generate a power delay distribution for each of these signals. A method for estimating the channel based on the power delay distribution may be needed. Summary of the Invention

[0005] One or more embodiments of this disclosure provide a wireless communication device for estimating a channel based on power delay distribution and a method of operating the wireless communication device.

[0006] According to one aspect of this disclosure, an operation method of a wireless communication device may include: obtaining a first pilot signal including a Physical Downlink Shared Channel (PDSCH) demodulation reference signal (DMRS) and a second pilot signal including at least one of a Tracking Reference Signal (TRS), a Channel State Information-Reference Signal (CSI-RS), and a Synchronization Signal Block (SSB); estimating the autocorrelation in the frequency domain of the first pilot signal based on the power delay distribution of the second pilot signal; generating channel estimation weights based on the autocorrelation; and estimating the channel of a data signal based on the channel estimation weights and the first pilot signal.

[0007] According to another aspect of this disclosure, a wireless communication device may include a radio frequency integrated circuit (RFIC) and a processor configured to receive a first pilot signal and a second pilot signal via the RFIC. The processor is further configured to measure the power delay distribution of the second pilot signal, estimate the autocorrelation of the first pilot signal in the frequency domain based on the power delay distribution of the second pilot signal, generate channel estimation weights based on the autocorrelation, and estimate the channel of a data signal based on the channel estimation weights and the first pilot signal. The first pilot signal includes a Physical Downlink Shared Channel (PDSCH) demodulation reference signal (DMRS), and the second pilot signal includes at least one of a Tracking Reference Signal (TRS), a Channel State Information-Reference Signal (CSI-RS), and a Synchronization Signal Block (SSB).

[0008] According to another aspect of this disclosure, a method of operating a wireless communication device includes: receiving a first pilot signal including at least one of a Physical Downlink Shared Channel (PDSCH) demodulation reference signal (DMRS) and a User Equipment-Specific Reference Signal (UE-RS), and a second pilot signal including at least one of a Cell-Specific Reference Signal (CRS), a Tracking Reference Signal (TRS), a Channel State Information-Reference Signal (CSI-RS), and a Synchronization Signal Block (SSB); determining a reference signal from the CRS, TRS, CSI-RS, and SSB for performing a power delay distribution measurement of the second pilot signal; measuring the power delay distribution of the reference signal of the second pilot signal; generating a channel estimation weight for the first pilot signal based on the power delay distribution of the reference signal; and estimating a channel of a data signal based on the channel estimation weight and the first pilot signal. Attached Figure Description

[0009] The embodiments will be more clearly understood through the following detailed description taken in conjunction with the accompanying drawings, in which:

[0010] Figure 1 A wireless communication system according to one or more embodiments is shown;

[0011] Figure 2 Resource allocation for a first pilot signal and a second pilot signal is illustrated according to one or more embodiments;

[0012] Figure 3 This is a schematic diagram illustrating the power delay distribution (PDP) according to one or more embodiments;

[0013] Figure 4 This is a block diagram illustrating a wireless communication device according to one or more embodiments;

[0014] Figure 5 A wireless communication device according to one or more embodiments is shown;

[0015] Figure 6 A method of operating a wireless communication device according to one or more embodiments is illustrated;

[0016] Figure 7A A method for estimating a channel using a PDP measured by a tracking reference signal (TRS) according to one or more embodiments is illustrated.

[0017] Figure 7B An example of resource mapping for TRS is shown;

[0018] Figure 8 A method of operating a wireless communication device for a novel radio (NR) system according to one or more embodiments is illustrated;

[0019] Figure 9A and Figure 9B This is a diagram illustrating the operation of a wireless communication device according to one or more embodiments, which selects a reference signal for measuring a PDP based on a priority level.

[0020] Figure 10 The operation of a wireless communication device according to one or more embodiments in determining whether to configure reference signals in the order of TRS, Channel State Information-Reference Signal (CSI-RS), and Synchronization Signal Block (SSB) is illustrated.

[0021] Figure 11 This illustrates one or more embodiments. Figure 5 A diagram illustrating the operation of a wireless communication device;

[0022] Figure 12 A method of operation of a wireless communication device operating in a Long Term Evolution (LTE) system and an NR system according to one or more embodiments is illustrated;

[0023] Figure 13 A method of operating a wireless communication device according to one or more embodiments is illustrated;

[0024] Figure 14 This is a block diagram illustrating an electronic device according to one or more embodiments; and

[0025] Figure 15 This is a diagram illustrating an example of a device for wireless communication according to one or more embodiments. Detailed Implementation

[0026] In the following description, embodiments will be described in detail with reference to the accompanying drawings.

[0027] In the following description, the same reference numerals are used for the same elements, even in different figures. Matters defined in the description, such as detailed constructions and elements, are provided to aid in a comprehensive understanding of the exemplary embodiments. However, it will be apparent that the exemplary embodiments can be practiced without those specifically defined matters. Furthermore, well-known functions or structures are not described in detail, as they would be obscured by unnecessary detail.

[0028] Expressions such as “at least one of…” modify the entire list of elements when they precede the list of elements, and do not modify the individual elements in the list. For example, the expression “at least one of A, b, and c” should be understood to include only A, only b, only c, both A and b, both A and c, both b and c, all of A, b, and c, or any variation of the foregoing examples.

[0029] While terms such as "first" and "second" can be used to describe various components, these components must not be limited to these terms. The terms mentioned above may be used only to distinguish one component from another.

[0030] Figure 1 A wireless communication system according to one or more embodiments is shown.

[0031] refer to Figure 1 The wireless communication system 10 may include a wireless communication device 120 and a base station 110. Although for ease of explanation... Figure 10 The wireless communication system 10 shown includes a base station 110 and a wireless communication device 120, but the embodiments are not limited thereto, and the wireless communication system 10 may include a greater number of base stations and a greater number of wireless communication devices.

[0032] Base station 110 communicates with wireless communication device 120 and allocates communication network resources to wireless communication device 120. It can be any of a NodeB (NB), eNodB (eNB), Next Generation Radio Access Network (NG RAN), Radio Access Unit, Base Station Controller, a node on the network, gNodeB (gNB), or a transmitting and receiving point. Base station 110 can provide communication services in a geographical area by interacting with mobile devices within that area, referred to as a cell.

[0033] Wireless communication device 120 communicates with base station 110 or another wireless communication device and may be referred to as a node, user equipment (UE), next-generation UE (NG UE), mobile station (MS), mobile device (ME), device or terminal.

[0034] In addition, the wireless communication device 120 may include at least one of the following: smartphone, tablet PC, mobile phone, video phone, e-book reader, desktop PC, laptop PC, netbook computer, personal digital assistant (PDA), portable multimedia player (PMP), MP3 player, medical device, camera, and wearable device. Furthermore, the wireless communication device 120 may include at least one of the following: television, digital video disc (DVD) player, audio system, refrigerator, air conditioner, vacuum cleaner, oven, microwave oven, washing machine, air purifier, set-top box, home automation control panel, security control panel, media box (e.g., Samsung HomeSync™, Apple TV™, or Google TV™), game console (e.g., Xbox™ or PlayStation™), electronic dictionary, electronic key, camera, and electronic photo frame. Furthermore, the wireless communication device 120 may include various medical devices (e.g., various portable medical measuring instruments such as blood glucose meters, heart rate monitors, blood pressure monitors, or thermometers), magnetic resonance angiography (MRA) machines, magnetic resonance imaging (MRI) machines, computed tomography (CT) scanners, and ultrasound machines), navigation devices, Global Navigation Satellite Systems (GNSS), Event Data Recorders (EDR), Flight Data Recorders (FDR), automotive infotainment systems, marine electronic equipment (e.g., marine navigation equipment or gyrocompasses), vehicle head units, industrial or household robots, drones, automated teller machines (ATMs) for financial institutions, point-of-sale (POS) devices for stores, and Internet of Things (IoT) devices (e.g., light bulbs, various sensors, sprinkler systems, fire alarms, temperature controllers, streetlights, ovens, exercise equipment, hot water tanks, heaters, or boilers). Additionally, the wireless communication device 120 may include various types of multimedia systems capable of performing communication functions.

[0035] Base station 110 can connect to wireless communication device 120 via a wireless channel to provide various communication services. Base station 110 can serve all user traffic through a shared channel and can collect status information of wireless communication device 120 (such as buffer status, available transmission power status, and channel status) and perform scheduling.

[0036] The wireless communication system 10 can support beamforming technology using orthogonal frequency division multiplexing (OFDM) as the wireless access technology. Furthermore, the wireless communication system 10 can support an adaptive modulation and coding (AMC) method, which determines the modulation scheme and channel coding rate based on the channel state of the wireless communication device 120.

[0037] Furthermore, the wireless communication system 10 can transmit and receive signals using a wide bandwidth of 6 GHz or higher. For example, the wireless communication system 10 can increase the data transmission rate by using millimeter-wave bandwidths such as the 28 GHz or 60 GHz bands. In this case, because the millimeter-wave band has relatively large signal attenuation per distance, the wireless communication system 10 can support transmission and reception based on directional beams generated using multiple antennas to ensure coverage. The wireless communication system 10 can be a system that supports multiple-input multiple-output (MIMO), and therefore, the base station 110 and the wireless communication device 120 can support beamforming technology. Beamforming technology can be classified into digital beamforming, analog beamforming, and hybrid beamforming.

[0038] Base station 110 can transmit a first pilot signal PS1 and a second pilot signal PS2 to wireless communication device 120. The first pilot signal PS1 can be a reference signal for decoding data signals and can be specific to a user equipment (UE). For example, the first pilot signal PS1 may include a Physical Downlink Shared Channel (PDSCH) demodulation reference signal (DMRS). The second pilot signal PS2 can be a different reference signal from the first pilot signal PS1. The second pilot signal PS2 can be a cell common signal, which is common to all UEs within a given cell. Unlike UE-specific signals tailored to individual UEs, cell common signals are configured to be used by any UE within the coverage area of ​​a specific cell. The second pilot signal PS2 can provide information to the UE to perform functions such as synchronization, channel estimation, and cell identification. For example, the second pilot signal PS2 may include a tracking reference signal (TRS), a channel state information-reference signal (CSI-RS), and a synchronization signal block (SSB). The second pilot signal PS2 may include various other reference signals and is not limited to the embodiments described above.

[0039] A wireless communication device 120, according to one or more embodiments, measures the power delay profile (PDP) of a second pilot signal PS2. The wireless communication device 120 estimates the frequency domain autocorrelation of a first pilot signal PS1 using the PDP. The wireless communication device 120 generates channel estimation weights using the autocorrelation. The wireless communication device 120 estimates the channel of a data signal based on the channel estimation weights and the first pilot signal PS1.

[0040] A wireless communication device 120 according to one or more embodiments can receive a first pilot signal PS1 including at least one of PDSCH DMRS and User Equipment-Specific Reference Signal (UE-RS), and a second pilot signal PS2 including at least one of Cell-Specific Reference Signal (CRS), TRS, CSI-RS, and SSB. The wireless communication device 120 can determine the second pilot signal PS2 from the CRS, TRS, CSI-RS, and SSB for performing PDP measurements. The wireless communication device 120 can measure the PDP of the second pilot signal PS2. The wireless communication device 120 can generate channel estimation weights for the first pilot signal PS1 based on the PDP. The wireless communication device 120 can estimate the channel of a data signal based on the channel estimation weights and the first pilot signal.

[0041] The wireless communication device 120 according to an embodiment of this application can enhance the channel estimation accuracy by directly calculating the frequency domain autocorrelation from the measured PDP of the second pilot signal PS2, instead of obtaining time-related variables (e.g., maximum delay, average delay, and root mean square (RMS) delay spread) from the PDP and then calculating the frequency domain autocorrelation based on the time-related variables.

[0042] The wireless communication device 120 according to an embodiment of this application can accurately estimate the channel of a data signal in a multipath channel model with long delay spread.

[0043] Figure 2 Resource allocation for a first pilot signal and a second pilot signal is illustrated according to one or more embodiments. In detail, Figure 2 An example of the transmission positions of the data signal, the first pilot signal PS1, and the second pilot signal PS2 along the time and frequency axes is shown. (Refer to...) Figure 1 describe Figure 2 .

[0044] refer to Figure 2The first pilot signal PS1 can be transmitted in the same time slot or transmission time interval (TTI) as the data signal. That is, the first pilot signal PS1 can be transmitted along with the data signal. Therefore, the wireless communication device 120 can estimate the channel for the data signal during the time slot in which the first pilot signal PS1 is transmitted. For example, the wireless communication device 120 can perform minimum mean square error (MMSE) estimation of the data signal channel using the first pilot signal PS1. For the wireless communication device 120 to perform MMSE estimation, autocorrelation of the first pilot signal PS1 along the time and frequency axes may be required. When the base station 110 transmits the first pilot signal PS1, which is narrowband precoded like the data signal, to the wireless communication device 120, the wireless communication device 120 may have difficulty recognizing the autocorrelation of the first pilot signal PS1. Therefore, the base station 110 can transmit a second pilot signal PS2 to the wireless communication device 120. (Reference) Figure 2 The second pilot signal PS2 can be transmitted at longer and more constant intervals than the first pilot signal PS1. The wireless communication device 120 can perform time and frequency synchronization by using the second pilot signal PS2, and can identify the autocorrelation of the first pilot signal PS1 by using the second pilot signal PS2.

[0045] The first pilot signal PS1 and the second pilot signal PS2 can have a quasi-co-located (QCL) relationship. For example, the first pilot signal PS1 and the second pilot signal PS2 can have a QCL-Type A relationship. In detail, the first pilot signal PS1 and the second pilot signal PS2 can have similar channel conditions in terms of Doppler frequency shift, Doppler spread, average delay, and delay spread.

[0046] The first pilot signal PS1 is a narrowband signal and may have a single precoding characteristic for each precoded resource block group (PRG). That is, the first pilot signal PS1 may have a common precoding characteristic for each PRG. The bandwidth of the second pilot signal PS2 may be wider than that of the first pilot signal PS1. For example, the second pilot signal PS2 may be a wideband signal. According to one or more embodiments, the second pilot signal PS2 may be a wideband precoded reference signal. According to another embodiment, the second pilot signal may be an unprecoded reference signal.

[0047] Figure 3 This is a schematic diagram illustrating a PDP according to one or more embodiments.

[0048] PDP is a function of the time delay (τ) of the multipath channel and represents the signal strength. (Reference) Figure 3 The horizontal axis represents time delay [sec], and the vertical axis represents signal strength [dB]. PDP can refer to the average power of the signal relative to the time delay measured from the received signal that has experienced various multipath paths.

[0049] refer to Figure 3 M represents the duration of the time delay range measured in the PDP. l It is the power value measured at the l-th channel tap.

[0050] Figure 4 This is a block diagram illustrating a wireless communication device according to one or more embodiments.

[0051] refer to Figure 4 The wireless communication device 200 may include a processor 201, a radio frequency integrated circuit (RFIC) 202, and a memory 203.

[0052] Processor 201 controls the overall operation of wireless communication device 200. For example, processor 201 can send and receive signals via RFIC 202. Furthermore, processor 201 can write data to and read data from memory 203. Additionally, processor 201 can perform the functions of the protocol stack required by the communication standard. Although each of processor 201, RFIC 202, and memory 203 is shown as a block for ease of explanation, wireless communication device 200 according to one or more embodiments may include multiple processors, multiple RFICs, and multiple memories. Processor 201 can control wireless communication device 200 to perform operations according to various embodiments.

[0053] RFIC 202 can perform functions for transmitting and receiving signals. For example, RFIC 202 can perform conversion functions between baseband signals and bit strings according to the system's physical layer specifications. For instance, during data transmission, RFIC 202 can generate complex symbols by encoding and modulating the transmitted bit string. Furthermore, RFIC 202 can up-convert baseband signals to RF band signals, which can then be transmitted via an antenna, and can down-convert RF band signals received via the antenna back to baseband signals. RFIC 202 may include transmit filters, receive filters, amplifiers, mixers, oscillators, digital-to-analog converters (DACs), and analog-to-digital converters (ADCs).

[0054] The memory 203 may store basic programs, application programs, and data such as setting information for operating the wireless communication device 120. The memory 203 may include volatile memory, non-volatile memory, or a combination of volatile memory and non-volatile memory. The memory 203 may provide the stored data to the processor 201 upon request.

[0055] A wireless communication device 200 according to one or more embodiments includes an RFIC 202 and a processor 201. The processor 201 receives a first pilot signal and a second pilot signal via the RFIC 202. The processor 201 can measure the PDP of the second pilot signal. The processor 201 can estimate the frequency domain autocorrelation of the first pilot signal using the PDP. The processor 201 can generate channel estimation weights using the autocorrelation. The processor 201 can estimate the channel of a data signal based on the channel estimation weights and the first pilot signal. The first pilot signal includes a Physical Downlink Shared Channel (PDSCH) demodulation reference signal (DMRS), and the second pilot signal includes at least one of a Tracking Reference Signal (TRS), a Channel State Information-Reference Signal (CSI-RS), and a Synchronization Signal Block (SSB). The processor 201 can receive configuration information of the second pilot signal from a base station via the RFIC 202. The processor 201 can receive the configuration information via Radio Resource Control (RRC) signaling. The processor 201 can measure the PDP of any one of the TRS, CSI-RS, and SSB based on the configuration information. Processor 201 can determine whether a reference signal for the next time slot is configured using configuration information received from the base station. For example, processor 201 can sequentially determine whether the TRS, CSI-RS, and SSB for the next time slot are configured using the configuration information. Processor 201 can determine that the TRS for the next time slot is configured and can measure the PDP of the TRS in the next time slot, regardless of whether the CSI-RS and SSB are configured. That is, when the TRS is configured, processor 201 can measure the PDP of the TRS. Processor 201 can determine that the TRS is not configured in the next time slot and can determine whether the CSI-RS is configured. When the TRS is not configured and the CSI-RS is configured in the next time slot, processor 201 can measure the PDP of the CSI-RS. Processor 201 can determine that neither the TRS nor the CSI-RS is configured in the next time slot and can determine whether the SSB is configured. When the TRS and CSI-RS are not configured and the SSB is configured in the next time slot, processor 201 can measure the PDP of the SSB. For example, processor 201 can measure the PDP of the Physical Broadcast Channel (PBCH) DMRS included in the SSB.

[0056] Figure 5 A wireless communication device according to one or more embodiments is shown.

[0057] Wireless communication device 300 can be Figure 4 It is part of the wireless communication device 200. (Reference) Figure 5The wireless communication device 300 includes a PDP estimator 302, a measurement-based PDP channel estimation (CE) weight generator 304, a channel estimator 306, and a demodulator / decoder 308. The PDP estimator 302, the measurement-based PDP CE weight generator 304, the channel estimator 306, and the demodulator / decoder 308 may be included in one or more processors. The wireless communication device 300 may also include components for transmitting and receiving data signals.

[0058] PDP estimator 302 can measure the PDP of the second pilot signal PS2. Specifically, PDP estimator 302 can measure the PDP of the second pilot signal PS2 received through multiple paths with delay spread. The measured PDP can be referred to as the estimated PDP. PDP estimator 302 can send the measured PDP to CE weight generator 304 based on the measured PDP. PDP estimator 302 sends the measured PDP itself to CE weight generator 304 based on the measured PDP without extracting statistical channel characteristics, including maximum delay, average delay, and root mean square (RMS) delay spread, from the measured PDP.

[0059] The measurement-based PDP-based CE weight generator 304 estimates the frequency domain autocorrelation of the first pilot signal PS1 by using the measured PDP. The measurement-based PDP-based CE weight generator 304 can obtain the frequency domain autocorrelation of the first pilot signal PS1 by using the measured PDP, as shown in Equation 1.

[0060] [Equation 1]

[0061]

[0062] [Equation 2]

[0063]

[0064] In equation 1, and It is the subcarrier index within the precoded resource block group (PRG). Equation 2 shows... and The range. Indicates the first The subcarrier and the first Frequency domain autocorrelation between subcarriers. This indicates the number of subcarriers within the PRG. The set { } represents the estimated power of the l-th tap within the PDP. M represents the estimated time length of the PDP. N represents the size of the Fast Fourier Transform (FFT) used in the communication system (e.g., a New Radio (NR) receiver system).

[0065] The measurement-based PDP CE weight generator 304 can generate channel estimation weights for the first pilot signal PS1 using the obtained frequency domain autocorrelation. These channel estimation weights can be referred to as channel estimation coefficients. The measurement-based PDP CE weight generator 304 can generate the channel estimation weights based on Equation 3.

[0066] [Equation 3]

[0067]

[0068] In equation 3, This represents the channel estimation weight matrix. The channel estimation weight matrix is ​​of size [value missing]. The matrix. This indicates the number of subcarriers of the first pilot signal PS1 within the PRG. This indicates the number of subcarriers within the PRG. Indicates size is The autocorrelation matrix. Indicates size is The identity matrix. It is the size of The cross-correlation matrix. It is the PRG channel. and the channel of the first pilot signal PS1 The cross-correlation matrix between them. This represents the noise power in the first pilot signal PS1.

[0069] Autocorrelation matrix of Equation 3 elements This can be represented as shown in Equation 4. The cross-correlation matrix of Equation 3. elements It can be represented as shown in Equation 5.

[0070] [Equation 4]

[0071] , ,

[0072] [Equation 5]

[0073] , , ,

[0074]

[0075] In equations 4 and 5, and This indicates the subcarrier index of the first pilot signal PS1 within the PRG. and It satisfies equation 6.

[0076] [Equation 6]

[0077]

[0078] The measurement-based PDP-based CE weight generator 304 can send channel estimation weights to the channel estimator 306. The channel estimator 306 can be based on the first pilot signal PS1. and channel estimation weights The channel is estimated using Equation 7.

[0079] [Equation 7]

[0080]

[0081] The measurement-based PDP-based CE weight generator 304 can send channel estimation weights to the channel estimator 306. . This indicates a channel within the PRG that includes both the data signal and the first pilot signal as subcarriers. The estimated value. Let PS1 represent the first pilot signal, and it can be represented as shown in Equation 8.

[0082] [Equation 8]

[0083]

[0084] In Equation 8, the first pilot signal PS1 It is the size of The column vector, and It is a diagonal matrix with a scrambling sequence of the first pilot signal PS1.

[0085] The measurement-based PDP-based CE weight generator 304 can send the estimated channel matrix to the demodulator / decoder 308. The demodulator / decoder 308 can use the estimated channel matrix. Data signals are demodulated and decoded to obtain information bits.

[0086] Figure 6 A method of operating a wireless communication device according to one or more embodiments is illustrated. (Refer to...) Figure 4 describe Figure 6 .

[0087] refer to Figure 6In operation S101, the wireless communication device 200 can measure the PDP of the second pilot signal. The wireless communication device 200 can receive configuration information of the second pilot signal from the base station. Based on the configuration information, the wireless communication device 200 can measure the PDP of any of the TRS, CSI-RS, and SSB. The wireless communication device 200 can receive the configuration information via Radio Resource Control (RRC) signaling.

[0088] According to one or more embodiments, when the TRS is configured, the wireless communication device 200 can measure the PDP of the TRS. When the TRS is configured and the CSI-RS is configured, the PDP of the CSI-RS can be measured. When the TRS is not configured, the CSI-RS is configured (for CSI-RS feedback), and the SSB is configured, the PDP of the SSB can be measured. When neither the TRS nor the CSI-RS is configured, but the SSB is configured, the wireless communication device 200 can measure the PDP of the SSB. When the SSB is not configured, the wireless communication device 200 can repeat the above process in the next time slot.

[0089] In operation S103, the wireless communication device 200 can measure the frequency domain autocorrelation of the first pilot signal PS1 by using the measured PDP.

[0090] In operation S105, the wireless communication device 200 can generate channel estimation weights for the first pilot signal PS1 based on the measured PDP.

[0091] In operation S107, the wireless communication device 200 can estimate the channel of the data signal by using channel estimation weights.

[0092] The first pilot signal is a narrowband signal and can have common precoding characteristics for each precoded resource block group (PRG). The bandwidth of the second pilot signal can be wider than that of the first pilot signal. The second pilot signal can be precoded.

[0093] Figure 7A A method for estimating a channel using a PDP measured by a TRS is illustrated in one or more embodiments of a wireless communication device. Figure 7B An example of resource mapping for TRS is shown. (Refer to...) Figure 4 describe Figure 7A .

[0094] refer to Figure 7A In operation S201, the wireless communication device 200 can measure the PDP of the TRS.

[0095] In operation S203, the wireless communication device 200 can generate channel estimation weights for PDSCH DMRS based on the measured PDP.

[0096] In operation S205, the wireless communication device 205 can estimate the channel of the PDSCH by using channel estimation weights.

[0097] refer to Figure 7B The TRS can be transmitted in two consecutive time slots. The wireless communication device 200 can measure the PDP by using the TRS transmitted in consecutive time slots.

[0098] The TRS can be wideband precoded. According to one or more embodiments, the wireless communication device 200 can measure the PDP of the wideband precoded TRS and can estimate the channel of the PDSCH based on the measured PDP.

[0099] TRS can be transmitted only within a portion of the bandwidth. For example, 52 resource blocks (RBs) can be used to transmit a TRS. The base station can transmit a TRS to the wireless communication device 200 only within a portion of the bandwidth.

[0100] Furthermore, the TRS can be a one-port signal transmitted based on a single port. The wireless communication device 200 can measure the PDP of the TRS transmitted based on a single port, and can generate channel estimation weights for the PDSCH DMRS by using the measured PDP.

[0101] Figure 8 A method of operating a wireless communication device for a novel radio (NR) system according to one or more embodiments is illustrated. Figure 9A and Figure 9B This is a diagram illustrating the operation of a wireless communication device according to one or more embodiments, whereby it selects a reference signal for measuring a PDP based on a priority level. The reference signal... Figure 4 describe Figure 8 , Figure 9A , Figure 9B .

[0102] refer to Figure 8 In operation S301, the wireless communication device 200 can measure the PDP of any one of TRS, CSI-RS, and SSB as a reference signal. According to one or more embodiments, the reference... Figure 9AIn operation S301a, the wireless communication device 200 can determine whether the TRS, CSI-RS, and SSB are configured. The terms "set" and "configured" are used interchangeably herein. In operation S303a, the wireless communication device 200 can select the reference signal with the highest priority from among multiple reference signals and measure the PDP of the selected reference signal. Information regarding the priority of the reference signals may be predetermined and stored in the wireless communication device 200, and / or may be received from a base station. For example, the wireless communication device 200 can determine the priority order of the TRS, CSI-RS, and SSB among the reference signals. For example, when the TRS is the reference signal with the highest priority, the wireless communication device 200 can first determine whether the TRS is configured, and when the TRS is configured, the wireless communication device 200 can measure the PDP of the TRS. When the TRS is not configured and the CSI-RS has the second highest priority among the reference signals, the wireless communication device 200 can determine whether the CSI-RS is configured. Figure 9B In operation S301b, the wireless communication device 200 can determine whether the CSI-RS is configured and its use. When the CSI-RS is configured, the wireless communication device 200 can measure the PDP of the CSI-RS. In operation S303b, when the CSI-RS is used for CSI-RS reporting, the wireless communication device 200 can perform PDP measurement without using the CSI-RS. That is, when the CSI-RS is sent to the wireless communication device 200 for feedback to the base station, the wireless communication device 200 can perform PDP measurement without using the CSI-RS. In this case, the wireless communication device 200 can determine whether the SSB is configured, and when the SSB is configured, it can measure the PDP of the SSB.

[0103] Return to reference Figure 8 In operation S303, the wireless communication device 200 can generate channel estimation weights for PDSCHDMRS based on the measured PDP.

[0104] In operation S305, the wireless communication device 200 can estimate the channel of the PDSCH by using channel estimation weights.

[0105] The wireless communication device 200 according to the above embodiments can operate not only in NR communication systems, but also in other communication systems.

[0106] Figure 10 The operation of a wireless communication device according to one or more embodiments in determining whether to configure reference signals in the order of TRS, CSI-RS, and SSB is illustrated. Figure 4 describe Figure 10 .

[0107] refer to Figure 10 In operation S401, the wireless communication device 200 can determine whether the TRS is configured. In operation S401a, when the TRS is configured, the wireless communication device 200 can measure the PDP of the TRS. In operation S401b, the wireless communication device 200 can generate channel estimation weights for the PDSCH DMRS based on the measured PDP, and can perform channel estimation on the PDSCH using the channel estimation weights.

[0108] According to one or more embodiments, the wireless communication device 200 can determine whether a TRS is configured in N subsequent time slots. N is a positive integer. When a TRS is configured in N subsequent time slots, the wireless communication device 200 can measure the PDP of the TRS in the N subsequent time slots. The wireless communication device 200 can generate channel estimation weights for the PDSCH DMRS based on the measured PDPs, and can perform channel estimation on the PDSCH using the channel estimation weights.

[0109] In operation S403, when the TRS is not configured, the wireless communication device 200 can determine whether the CSI-RS is configured. According to one or more embodiments, the wireless communication device 200 can determine whether the CSI-RS is configured in N subsequent time slots. In operation S403a, when the CSI-RS is configured, the wireless communication device 200 can measure the PDP of the CSI-RS. According to one or more embodiments, the wireless communication device 200 can measure the PDP of the CSI-RS in N subsequent time slots. In operation S403b, the wireless communication device 200 can generate channel estimation weights for the PDSCH DMRS based on the measured PDP, and can perform channel estimation on the PDSCH using the channel estimation weights.

[0110] In operation S405, when CSI-RS is not configured, the wireless communication device 200 can determine whether an SSB is configured. According to one or more embodiments, the wireless communication device 200 can determine whether an SSB is configured in N subsequent time slots. In operation S405a, when an SSB is configured, the wireless communication device 200 can measure the PDP of the SSB. According to one or more embodiments, the wireless communication device 200 can measure the PDP of the SSB in N subsequent time slots. In operation S405b, the wireless communication device 200 can generate channel estimation weights for the PDSCH DMRS based on the measured PDPs, and can perform channel estimation on the PDSCH using the channel estimation weights.

[0111] although Figure 10 Operations S401, S403, and S405 are shown in sequential order, but they can be performed in parallel or in conjunction with... Figure 10The different orders of execution shown indicate whether TRI, CSI-RS, and SSB are configured.

[0112] Figure 11 This illustrates one or more embodiments. Figure 5 A diagram illustrating the operation of a wireless communication device. (Refer to...) Figure 5 describe Figure 11 .

[0113] refer to Figure 11 The wireless communication device 300 can determine whether the TRS is configured. When the TRS is configured, the PDP estimator 302 can measure the PDP of the TRS. The CE weight generator 304 based on the measured PDP can generate channel estimation weights for the PDSCH DMRS based on the measured PDP, and the channel estimator 306 can perform channel estimation on the PDSCH by using the channel estimation weights.

[0114] According to one or more embodiments, wireless communication device 300 can determine whether a TRS is configured in N subsequent time slots. N is a positive integer. When a TRS is configured in N subsequent time slots, PDP estimator 302 can measure the PDP of the TRS in the N subsequent time slots. CE weight generator 304 based on the measured PDP can generate channel estimation weights for PDSCH DMRS based on the measured PDP, and channel estimator 306 can perform channel estimation on the PDSCH by using the channel estimation weights.

[0115] When the TRS is not configured, the wireless communication device 300 can determine whether the CSI-RS is configured. According to one or more embodiments, the wireless communication device 300 can determine whether the CSI-RS is configured in N subsequent time slots. When the CSI-RS is configured, the wireless communication device 300 can measure the PDP of the CSI-RS. According to one or more embodiments, the PDP estimator 302 can measure the PDP of the CSI-RS in N subsequent time slots. The CE weight generator 304 based on the measured PDP can generate channel estimation weights for the PDSCH DMRS based on the measured PDP, and the channel estimator 306 can perform channel estimation on the PDSCH using the channel estimation weights.

[0116] When CSI-RS is not configured, wireless communication device 300 can determine whether SSB is configured. According to one or more embodiments, wireless communication device 300 can determine whether SSB is configured in N subsequent time slots. When SSB is configured, PDP estimator 302 can measure the PDP of the SSB. According to one or more embodiments, PDP estimator 302 can measure the PDP of the SSB in N subsequent time slots. CE weight generator 304 based on the measured PDP can generate channel estimation weights for PDSCHDMRS based on the measured PDP, and channel estimator 306 can perform channel estimation on PDSCH by using the channel estimation weights.

[0117] Figure 12 Operation methods of wireless communication devices in Long Term Evolution (LTE) and NR systems according to one or more embodiments are illustrated. Reference will be made to... Figure 4 describe Figure 12 .

[0118] refer to Figure 12 In operation S501, the wireless communication device 200 can receive a first pilot signal including at least one of PDSCH DMRS and UE-RS and a second pilot signal including at least one of CRS, TRS, CSI-RS and SSB.

[0119] In operation S503, the wireless communication device 200 can determine the second pilot signal for performing PDP measurements from CRS, TRS, CSI-RS, and SSB. For example, the wireless communication device 200 can receive configuration information of the second pilot signal from the base station. The wireless communication device 200 can determine the second pilot signal for performing PDP measurements based on the configuration information. The wireless communication device 200 can receive the configuration information from the base station via RRC signaling.

[0120] According to one or more embodiments, when the TRS is configured, the wireless communication device 200 can determine the TRS as a second pilot signal for measuring the PDP. When the TRS is not configured and the CSI-RS is configured, the wireless communication device 200 can determine the CSI-RS as a second pilot signal for measuring the PDP. When the TRS is not configured, the CSI-RS is configured, the CSI-RS is used for CSI-RS feedback, and the SSB is configured, the wireless communication device 200 can determine the SSB as a second pilot signal for measuring the PDP.

[0121] According to one or more embodiments, when the CRS is configured, the wireless communication device 200 can determine the CRS as a second pilot signal for measuring the PDP. When the CRS is not configured and the CSI-RS is configured, the wireless communication device 200 can determine the CSI-RS as a second pilot signal for measuring the PDP.

[0122] In operation S505, the wireless communication device 200 can measure the PDP of the second pilot signal.

[0123] In operation S507, the wireless communication device 200 can generate channel estimation weights for the first pilot signal based on the PDP. For example, the wireless communication device 200 can estimate the frequency domain autocorrelation of the first pilot signal using the PDP. Furthermore, the wireless communication device 200 can generate channel estimation weights using the autocorrelation.

[0124] In operation S509, the wireless communication device 200 can estimate the channel of the data signal based on the channel estimation weight and the first pilot signal.

[0125] Figure 13 A method of operating a wireless communication device according to one or more embodiments is illustrated. (Refer to...) Figure 4 describe Figure 13 .

[0126] refer to Figure 13 In operation S601, the wireless communication device 200 can determine whether the CRS is configured. In operation S601a, when the CRS is configured, the wireless communication device 200 can measure the PDP of the CRS. In operation S601b, the wireless communication device 200 can generate channel estimation weights for at least one of the PDSCH DMRS and UE-RS based on the measured PDP, and can perform channel estimation on the PDSCH using the channel estimation weights.

[0127] In operation S603, when CRS is not configured, the wireless communication device 200 can determine whether CSI-RS is configured. In operation S603a, when CSI-RS is configured, the wireless communication device 200 can measure the PDP of CSI-RS. In operation S603b, the wireless communication device 200 can generate channel estimation weights for at least one of PDSCH DMRS and UE-RS based on the measured PDP, and can perform channel estimation on PDSCH using the channel estimation weights. When CSI-RS is used to send CSI-RS feedback signals to the base station, the wireless communication device 200 may not measure the PDP of CSI-RS. The wireless communication device 200 can repeat the above process in the next time slot.

[0128] Figure 14 This is a block diagram illustrating an electronic device according to one or more embodiments.

[0129] refer to Figure 14 Electronic device 1000 may include memory 1010, processor 1022, input / output control interface 1040, display 1050, input device 1060, and communication processor 1090. Electronic device 1000 may include multiple memories 1010. Each component is as follows.

[0130] Memory 1010 may include a program storage unit 1010 for storing programs for controlling the operation of electronic devices and a data storage device 1012 for storing data generated during program execution. Data storage device 1012 may store data required for the operation of application program 1013 and measurement-based PDP channel estimation program 1014. Program storage device 1011 may include application program 1013 and measurement-based PDP channel estimation program 1014. The program included in program storage device 1011 is a set of instructions, which may be represented as an instruction set.

[0131] Application 1013 includes an application running on an electronic device. That is, application 1013 may include instructions for an application driven by processor 1022. According to an embodiment, a measurement-based PDP channel estimation program 1014 can determine the priority level of a reference signal used for PDP measurement. According to an embodiment, the measurement-based PDP channel estimation program 1014 can perform channel estimation using a measured PDP.

[0132] Peripheral interface 1023 can control the connection of processor 1022 and memory interface 1021 to the input / output peripheral devices of the base station. Processor 1022 controls the base station to provide corresponding services by using at least one software program. In this case, processor 1022 can execute at least one program stored in memory 1010 and can provide services corresponding to at least one program.

[0133] The input / output control interface 1040 provides an interface between input / output devices (such as display 1050 and input device 1060) and the peripheral device interface 1023. Display 1050 displays status information, input characters, moving images, still images, etc. For example, display 1050 can display application information driven by processor 1022.

[0134] Input device 1060 can provide input data generated by selecting an electronic device to processor 1022 via input / output control interface 1040. In this case, input device 1060 may include a keypad including at least one hardware button and a touchpad for sensing touch information. For example, input device 1060 can provide touch information sensed by the touchpad, such as touch, touch movement, and touch release, to processor 1022 via input / output control interface 1040. Electronic device 1000 may include a communication processor 1090 that performs communication functions for voice and data communication.

[0135] Those skilled in the art will understand that various changes in form and detail may be made therein without departing from the spirit and scope of the inventive concept. When considering the foregoing description, if modifications and variations of the inventive concept fall within the scope of the claims and their equivalents, it is to be construed that the inventive concept includes such modifications and variations.

[0136] Figure 15 This is a diagram illustrating an example of a device for wireless communication according to one or more embodiments.

[0137] refer to Figure 15 The diagram illustrates an Internet of Things (IoT) network system that includes household gadgets 311, home appliances 312, entertainment devices 313, and access points 315.

[0138] Figure 15 Devices used for wireless communication can determine the priority level of reference signals used for PDP measurements, such as reference... Figures 1 to 13 Described. Furthermore, in Figure 15 In a device for wireless communication, according to an embodiment, a channel estimation procedure 1014 based on a measured PDP can perform channel estimation using the measured PDP.

[0139] Embodiments have been described with reference to the accompanying drawings and specification. While specific terminology has been used to describe the embodiments, these terms are for illustrative purposes only and should not be construed as limiting the scope of the inventive concept as defined by the claims. Therefore, those skilled in the art will understand that various modifications and other equivalent embodiments can be made therein. Accordingly, the technical scope of the inventive concept should be defined by the following claims.

[0140] Although embodiments have been described using specific terminology, these terms are for illustrative purposes only and should not be construed as limiting the scope of the inventive concept as defined by the claims. Therefore, those skilled in the art will understand that various modifications and other equivalent embodiments can be made therein. Accordingly, the technical scope of the inventive concept should be defined by the following claims.

[0141] While the inventive concept has been specifically shown and described with reference to embodiments thereof, it should be understood that various changes in form and detail may be made therein without departing from the spirit and scope of the appended claims.

Claims

1. An operation method of a wireless communication device, the operation method comprising: obtaining a first pilot signal including a physical downlink shared channel (PDSCH) demodulation reference signal (DMRS) and a second pilot signal including at least one of a tracking reference signal (TRS), a channel state information-reference signal (CSI-RS), and a synchronization signal block (SSB); estimating an autocorrelation in a frequency domain of the first pilot signal based on a power delay profile of the second pilot signal; generating a channel estimation weight based on the autocorrelation; and estimating a channel of a data signal based on the channel estimation weight and the first pilot signal. 2.The operation method of claim 1, further comprising receiving configuration information of the second pilot signal from a base station, measuring a power delay profile of at least one of the TRS, the CSI-RS, and the SSB as the power delay profile of the second pilot signal based on the configuration information. The measuring of the power delay profile includes measuring a power delay profile of the TRS when the TRS is configured.

3. The operating method of claim 2, wherein, The measuring of the power delay profile includes measuring a power delay profile of the CSI-RS when the TRS is not configured and the CSI-RS is configured.

4. The operating method of claim 2, wherein, The measuring of the power delay profile includes measuring a power delay profile of the SSB when the TRS is not configured, the CSI-RS is configured for CSI-RS feedback, and the SSB is configured.

5. The operating method of claim 2, wherein, The measuring of the power delay profile includes measuring a power delay profile of the SSB when the TRS and the CSI-RS are not configured and the SSB is configured.

6. The operating method of claim 2, wherein, The configuration information is received through radio resource control (RRC) signaling.

7. The operating method of claim 2, wherein, The first pilot signal has a single precoding property for each precoding resource block group (PRG).

8. The operating method of claim 1, wherein, A frequency band of the second pilot signal is wider than a frequency band of the first pilot signal.

9. The operating method of claim 1, wherein, The second pilot signal is precoded.

10. The operating method of claim 1, wherein, 11.A wireless communication device comprising: a radio frequency integrated circuit (RFIC); and a processor configured to: receive a first pilot signal and a second pilot signal through the RFIC; measure a power delay profile of the second pilot signal; estimate an autocorrelation in a frequency domain of the first pilot signal based on a power delay profile of the second pilot signal; generate a channel estimation weight based on the autocorrelation; and estimate a channel of a data signal based on the channel estimation weight and the first pilot signal, wherein the first pilot signal includes a physical downlink shared channel (PDSCH) demodulation reference signal (DMRS), and the second pilot signal includes at least one of a tracking reference signal (TRS), a channel state information-reference signal (CSI-RS), and a synchronization signal block (SSB). The processor is further configured to: receive configuration information of the second pilot signal from a base station through the RFIC, and measure a power delay profile of any one of the TRS, the CSI-RS, and the SSB as the power delay profile of the second pilot signal based on the configuration information.

12. The wireless communication device of claim 11, wherein, ​ ​ ​ 13. The wireless communication device of claim 12, wherein, The processor is also configured to measure the power delay distribution of the TRS when the TRS is configured.

14. The wireless communication device of claim 12, wherein, The processor is also configured to measure the power delay distribution of the CSI-RS when the TRS is not configured and the CSI-RS is configured.

15. A method of operating a wireless communication device, the method comprising: Receive a first pilot signal including at least one of the Physical Downlink Shared Channel (PDSCH) demodulation reference signal (DMRS) and user equipment-specific reference signal (UE-RS), and a second pilot signal including at least one of the cell-specific reference signal (CRS), tracking reference signal (TRS), channel state information-reference signal (CSI-RS), and synchronization signal block (SSB). A reference signal for performing the power delay distribution measurement is determined from the CRS, the TRS, the CSI-RS, and the SSB; Measure the power delay distribution of the reference signal of the second pilot signal; The channel estimation weights for the first pilot signal are generated based on the power delay distribution of the reference signal. as well as The channel of the data signal is estimated based on the channel estimation weights and the first pilot signal.

16. The method of operation of claim 15, wherein, The channel estimation weights for generating the first pilot signal based on the power delay distribution include: The autocorrelation in the frequency domain of the first pilot signal is estimated based on the power delay distribution; and The channel estimation weights are generated based on the autocorrelation.

17. The operating method according to claim 15, further comprising receiving configuration information from the base station for the second pilot signal, wherein Determining the reference signal for the second pilot signal includes determining the reference signal for the second pilot signal based on the configuration information.

18. The method of operation of claim 17, wherein, The configuration information is received via Radio Resource Control (RRC) signaling.

19. The method of operating according to claim 17, wherein, The reference signal for determining the second pilot signal includes: When the TRS is configured, the TRS is determined as a reference signal for the second pilot signal used to measure the power delay distribution; When the TRS is not configured and the CSI-RS is configured, the CSI-RS is determined as a reference signal for the second pilot signal used to measure the power delay distribution; and When the TRS is not configured, the CSI-RS is configured for CSI-RS feedback, and the SSB is configured, the SSB is determined as a reference signal for the second pilot signal used to measure the power delay distribution.

20. The operating method of claim 17, wherein, The reference signal for determining the second pilot signal includes: When the CRS is configured, the CRS is determined as a reference signal for the second pilot signal used to measure the power delay distribution; and When the CRS is not configured and the CSI-RS is configured, the CSI-RS is determined as a reference signal for the second pilot signal used to measure the power delay distribution.

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