CN115987743B - Channel state estimation method, device, communication equipment and storage medium - Google Patents
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Abstract
The application relates to a channel state estimation method, a device, a communication device and a storage medium. The method comprises the following steps: acquiring a first initial estimation sequence according to each first pilot signal in a first OFDM symbol, and acquiring a second initial estimation sequence according to each second pilot signal in a second OFDM symbol, wherein the subcarrier position corresponding to each first pilot signal is different from the subcarrier position corresponding to each second pilot signal; performing fusion processing on the second initial estimation sequence and the first initial estimation sequence to obtain a target estimation sequence corresponding to the first OFDM symbol; the subcarrier interval corresponding to the adjacent target estimated value in the target estimated sequence is smaller than the subcarrier interval corresponding to the adjacent first initial estimated value in the first initial estimated sequence, and the target estimated sequence is used for estimating channel state information corresponding to the first OFDM symbol. The method can improve the accuracy of channel state estimation.
Description
Technical Field
The present disclosure relates to the field of wireless communications technologies, and in particular, to a channel state estimation method, a device, a communication device, and a storage medium.
Background
In a wireless communication system based on OFDM (Orthogonal Frequency Division Multiplexing ) technology, a basic data unit of communication between a receiving end and a transmitting end is an OFDM subframe; an OFDM subframe is divided into a plurality of OFDM symbols according to a time domain and into a plurality of subcarriers according to a frequency domain. In order for the receiving end to accurately acquire the data transmitted by the transmitting end, accurate estimation needs to be performed on channel state information such as channel length, channel envelope and the like between the receiving end and the transmitting end.
The current channel state estimation method is to insert a pilot signal known by a receiving end in the frequency domain of part of OFDM symbols in an OFDM subframe; the receiving end obtains an initial channel estimation value corresponding to a target OFDM symbol where the pilot signal is located according to the received pilot signal; then the receiving end estimates the channel state information corresponding to the target OFDM symbol according to the initial channel estimation value; and estimating the channel state information corresponding to other OFDM symbols according to the channel state information corresponding to the target OFDM symbol.
However, the accuracy of the channel state information obtained by the above method is low.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a channel state estimation method, apparatus, communication device, and storage medium that can improve the accuracy of the obtained channel state information.
In a first aspect, the present application provides a channel state estimation method. The method comprises the following steps:
acquiring a first initial estimation sequence according to each first pilot signal in a first OFDM symbol, and acquiring a second initial estimation sequence according to each second pilot signal in a second OFDM symbol, wherein the subcarrier position corresponding to each first pilot signal is different from the subcarrier position corresponding to each second pilot signal;
performing fusion processing on the second initial estimation sequence and the first initial estimation sequence to obtain a target estimation sequence corresponding to the first OFDM symbol;
the subcarrier interval corresponding to the adjacent target estimated value in the target estimated sequence is smaller than the subcarrier interval corresponding to the adjacent first initial estimated value in the first initial estimated sequence, and the target estimated sequence is used for estimating channel state information corresponding to the first OFDM symbol.
In one embodiment, the fusing processing is performed on the second initial estimation sequence and the first initial estimation sequence to obtain a target estimation sequence corresponding to the first OFDM symbol, including:
and respectively inserting second initial estimated values of all second pilot signals in the second initial estimated sequence between first initial estimated values of all first pilot signals in the first initial estimated sequence to obtain a target estimated sequence.
In one embodiment, the subcarrier spacing corresponding to each adjacent target estimation value in the target estimation sequence is equal.
In one embodiment, the target estimation sequence is further configured to estimate channel state information corresponding to the second OFDM symbol, where a subcarrier interval corresponding to an adjacent target estimation value in the target estimation sequence is smaller than a subcarrier interval corresponding to an adjacent second initial estimation value in the second initial estimation sequence.
In one embodiment, the number of the second OFDM symbols is a plurality, and the fusing processing is performed on the second initial estimation sequence and the first initial estimation sequence to obtain a target estimation sequence corresponding to the first OFDM symbol, including:
and carrying out fusion processing on each second initial estimation sequence and the first initial estimation sequence to obtain a target estimation sequence.
In one embodiment, the first OFDM symbol and the second OFDM symbol are located in the same target region in the target OFDM subframe, and the subcarrier positions corresponding to the pilot signals in the OFDM symbols in the target region are different.
In one embodiment, the method further comprises:
performing inverse Fourier transform on the target estimation sequence to obtain a time domain channel impulse response corresponding to the first OFDM symbol;
Carrying out noise reduction treatment on the impulse response of the time domain channel to obtain a noise-reduced impulse response;
and obtaining channel state information corresponding to the first OFDM symbol according to the impulse response after noise reduction.
In a second aspect, the present application further provides a channel state estimation apparatus. The device comprises:
the acquisition module is used for acquiring a first initial estimation sequence according to each first pilot signal in the first OFDM symbol, and acquiring a second initial estimation sequence according to each second pilot signal in the second OFDM symbol, wherein the subcarrier position corresponding to each first pilot signal is different from the subcarrier position corresponding to each second pilot signal;
the fusion module is used for carrying out fusion processing on the second initial estimation sequence and the first initial estimation sequence to obtain a target estimation sequence corresponding to the first OFDM symbol;
the subcarrier interval corresponding to the adjacent target estimated value in the target estimated sequence is smaller than the subcarrier interval corresponding to the adjacent first initial estimated value in the first initial estimated sequence, and the target estimated sequence is used for estimating channel state information corresponding to the first OFDM symbol.
In a third aspect, the present application also provides a communication device. The communication device comprises a memory storing a computer program and a processor which when executing the computer program performs the steps of:
Acquiring a first initial estimation sequence according to each first pilot signal in a first OFDM symbol, and acquiring a second initial estimation sequence according to each second pilot signal in a second OFDM symbol, wherein the subcarrier position corresponding to each first pilot signal is different from the subcarrier position corresponding to each second pilot signal;
performing fusion processing on the second initial estimation sequence and the first initial estimation sequence to obtain a target estimation sequence corresponding to the first OFDM symbol;
the subcarrier interval corresponding to the adjacent target estimated value in the target estimated sequence is smaller than the subcarrier interval corresponding to the adjacent first initial estimated value in the first initial estimated sequence, and the target estimated sequence is used for estimating channel state information corresponding to the first OFDM symbol.
In a fourth aspect, the present application also provides a computer-readable storage medium. The computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:
acquiring a first initial estimation sequence according to each first pilot signal in a first OFDM symbol, and acquiring a second initial estimation sequence according to each second pilot signal in a second OFDM symbol, wherein the subcarrier position corresponding to each first pilot signal is different from the subcarrier position corresponding to each second pilot signal;
Performing fusion processing on the second initial estimation sequence and the first initial estimation sequence to obtain a target estimation sequence corresponding to the first OFDM symbol;
the subcarrier interval corresponding to the adjacent target estimated value in the target estimated sequence is smaller than the subcarrier interval corresponding to the adjacent first initial estimated value in the first initial estimated sequence, and the target estimated sequence is used for estimating channel state information corresponding to the first OFDM symbol.
The channel state estimation method, the device, the communication equipment and the storage medium are characterized in that a first initial estimation sequence is obtained according to each first pilot signal in a first OFDM symbol, a second initial estimation sequence is obtained according to each second pilot signal in a second OFDM symbol, and the position of a subcarrier corresponding to each first pilot signal is different from the position of a subcarrier corresponding to each second pilot signal; performing fusion processing on the second initial estimation sequence and the first initial estimation sequence to obtain a target estimation sequence corresponding to the first OFDM symbol; the method comprises the steps that subcarrier intervals corresponding to adjacent target estimated values in a target estimated sequence are smaller than subcarrier intervals corresponding to adjacent first initial estimated values in a first initial estimated sequence, and the target estimated sequence is used for estimating channel state information corresponding to a first OFDM symbol; by adopting the method, as the subcarrier interval corresponding to the adjacent target estimated value in the target estimated sequence is smaller than the subcarrier interval corresponding to the adjacent first initial estimated value in the first initial estimated sequence, the target estimated sequence contains more channel estimated values (namely target estimated values) compared with the first initial estimated sequence; in this way, when the target estimation sequence is used for estimating the channel state information corresponding to the first OFDM symbol, the available channel estimation value is increased, which is equivalent to that the number of available pilot signals is increased, and then the resolution of each CIR path in the time domain CIR (Channel Impulse Response ) is higher and the amplitude power is more concentrated according to the target estimation sequence, so that the problem that the accuracy of the channel state information is lower due to the fact that the traditional method of estimating the channel state information corresponding to the first OFDM symbol by using the first initial estimation sequence is avoided because the first initial estimation value in the first initial estimation sequence is sparse, namely, the resolution of each CIR path in the time domain CIR is not high and the amplitude power concentration is insufficient due to the sparse pilot signal in the first OFDM symbol is solved; according to the method and the device for estimating the channel state information, the channel state information corresponding to the first OFDM symbol is estimated by using the target estimation sequence, and the accuracy of channel state estimation is improved.
Drawings
FIG. 1 is a diagram of an application environment for a channel state estimation method in one embodiment;
FIG. 2 is a flow chart of a channel state estimation method according to an embodiment;
FIG. 3 is an exemplary design corresponding to pilot signal insertion OFDM sub-frame frequency domain in a wireless communication system based on OFDM technology in one embodiment;
FIG. 4 is a diagram of an equivalent pilot signal design after fusing a second initial estimation sequence with a first initial estimation sequence in one embodiment;
fig. 5 is an exemplary design corresponding to a pilot signal insertion OFDM subframe frequency in a wireless communication system based on OFDM technology in another embodiment
FIG. 6 is an exemplary allocation diagram of pilot signals and data for a target OFDM subframe in one embodiment;
FIG. 7 is a diagram of yet another exemplary allocation of pilot signals and data for a target OFDM subframe in one embodiment;
FIG. 8 is a flow chart of a channel state estimation method according to another embodiment;
FIG. 9 is a block diagram of a channel state estimation device in one embodiment;
fig. 10 is an internal structural diagram of a communication device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The channel state estimation method provided by the embodiment of the application can be applied to an application environment shown in fig. 1. Wherein the terminal 102 communicates with the network device 104 via a network. The terminal (Terminal Equipment, TE) 102 may also be referred to as a user equipment (UserEquipment, UE), the terminal 102 may be various mobile devices, and the terminal 102 may be, for example, a mobile phone (or "cellular" phone), a computer with a mobile terminal, etc., and the terminal 102 may also be a portable, pocket, hand-held, computer-built-in or vehicle-mounted mobile device. The network device 104 may be a device for communicating with the terminal 102, for example, may be a base station (BaseTransceiver Station, abbreviated as "BTS") in a GSM (Global System for Mobile Communications ) system or a CDMA (Code Division Multiple Access, code division multiple access) system, may be a base station (NodeB, abbreviated as "NB") in a WCDMA (Wideband Code Division Multiple Access ) system, and may be an evolved base station (Evolutional Node B, abbreviated as "eNB" or "eNodeB") in an LTE (Long Term Evolution ) system, which is not limited to the terminal 102 and the network device 104.
In the application environment shown in fig. 1, the terminal 102 or the network device 104 obtains a first initial estimation sequence according to each first pilot signal in a first OFDM symbol, and obtains a second initial estimation sequence according to each second pilot signal in a second OFDM symbol, where the subcarrier position corresponding to each first pilot signal is different from the subcarrier position corresponding to each second pilot signal; performing fusion processing on the second initial estimation sequence and the first initial estimation sequence to obtain a target estimation sequence corresponding to the first OFDM symbol; the subcarrier interval corresponding to the adjacent target estimated value in the target estimated sequence is smaller than the subcarrier interval corresponding to the adjacent first initial estimated value in the first initial estimated sequence, and the target estimated sequence is used for estimating channel state information corresponding to the first OFDM symbol.
Referring to fig. 2, a flowchart of a channel state estimation method according to an embodiment of the present application is shown, where the channel state estimation method may be applied to the terminal 102 described above. As shown in fig. 2, the channel state estimation method may include the steps of:
The first OFDM symbol and the second OFDM symbol are two OFDM symbols containing pilot signals in the same OFDM subframe received by the terminal, and the subcarrier positions corresponding to the first pilot signals in the first OFDM symbol are different from the subcarrier positions corresponding to the second pilot signals in the second OFDM symbol. It should be noted that the "first" and "second" are not limited to symbol positions or OFDM symbol sequences, and are only for convenience of description. In the embodiment of the application, the first OFDM symbol is used to represent any one or more OFDM symbols containing pilot signals; the second OFDM symbol is used for representing any one or a plurality of OFDM symbols with different subcarrier position relations corresponding to the first pilot signals in the first OFDM symbol; it will be appreciated that in other embodiments, the second OFDM symbol may be used to represent any one or more OFDM symbols that include pilot signals, and the first OFDM symbol is used to represent any one or more OFDM symbols that have different subcarrier location relationships corresponding to the second pilot signal in the second OFDM symbol.
Wherein the pilot signal is a known signal provided by the base station to the terminal for channel estimation or channel sounding. In this embodiment of the present application, the first pilot signal is used to represent a pilot signal in a first OFDM symbol, the second pilot signal is used to represent a pilot signal in a second OFDM symbol, and specific data included in each first pilot signal may be different or identical, and corresponding, specific data included in each second pilot signal may be different or identical; the specific data contained in the first pilot signal may be the same as or different from the specific data contained in the second pilot signal.
Referring to fig. 3, an exemplary design pattern corresponding to pilot signal insertion OFDM subframe frequency domain in a wireless communication system based on OFDM technology is shown. As shown in fig. 3, the first pilot signal 0 is inserted at equal intervals on the first OFDM symbol, the second pilot signal 1 is inserted at equal intervals on the second OFDM symbol, and the subcarrier positions corresponding to the first pilot signal 0 and the second pilot signal 1 are also staggered at equal intervals; the subcarrier location corresponding to the first pilot signal 0 may also be referred to as a frequency domain RE (Resource Element) location of the first pilot signal 0, and similarly, the subcarrier location corresponding to the second pilot signal 1 may also be referred to as a frequency domain RE location of the second pilot signal 1.
In the exemplary design corresponding to the frequency domain of the OFDM subframe, the distribution among the first pilot signals on the first OFDM symbol may be non-equally spaced if the number of the first pilot signals is greater than 1; similarly, in the case where the number of second pilot signals is greater than 1, the distribution between the second pilot signals on the second OFDM symbol may also be non-equally spaced; accordingly, the subcarrier positions corresponding to the first pilot signal 0 and the second pilot signal 1 may not be staggered at equal intervals, and only the subcarrier positions corresponding to the first pilot signals and the subcarrier positions corresponding to the second pilot signals need to be different.
In this embodiment of the present application, the first OFDM symbol and the second OFDM symbol refer to two OFDM symbols including pilot signals in an OFDM subframe received by a terminal, and the first pilot signal and the second pilot signal refer to pilot signals received by the terminal. Acquiring a first initial estimation sequence according to each first pilot signal in the first OFDM symbol, wherein the first initial estimation sequence comprises the following steps: the terminal receives the first pilot frequency sequence,
And terminal local known pilot sequences
The first initial estimated sequence corresponding to the first OFDM symbol may be calculated according to equation 1:
Wherein,,
representing the first of the first initial estimation sequenceskFirst initial estimate,/-, for>
Representing the first pilot sequencekFirst pilot signal, ">
Is->
Conjugation of->
Representing the first of the locally known pilot sequenceskLocal pilot signal,/->
，NIs the length of the first pilot sequence,Ntransmission bandwidth of signal->
Related, exemplary, < >>
。
The implementation manner of obtaining the second initial estimation sequence according to each second pilot signal in the second OFDM symbol is similar to the implementation manner of obtaining the first initial estimation sequence, and is not described herein.
The target estimation sequence refers to a sequence obtained after the first initial estimation sequence and the second initial estimation sequence are fused, and a subcarrier interval corresponding to an adjacent target estimation value in the target estimation sequence is smaller than a subcarrier interval corresponding to an adjacent first initial estimation value in the first initial estimation sequence. Since the pilot signal is a signal known to the terminal and does not transmit data, that is, the more the pilot signal duty ratio in one OFDM subframe is, the less useful data is transmitted in the OFDM subframe, and thus the duty ratio of the pilot signal in one OFDM subframe is controlled to be a certain ratio. But the less the pilot signal duty cycle, the more sparsely it is distributed in the OFDM subframe, i.e., the larger the interval between pilot signals, thereby resulting in a low accuracy in channel state information estimation using pilot signals. In the embodiment of the application, the fused target estimation sequence is used for estimating the channel state information corresponding to the first OFDM symbol; in this way, when the channel state information corresponding to the first OFDM symbol is estimated using the target estimation sequence, the subcarrier interval corresponding to the pilot signal that can be used to estimate the channel state information on the first OFDM symbol becomes smaller, and it can be understood that the pilot signal that can be used to estimate the channel state on the first OFDM symbol becomes larger; the more pilot signals, the higher the accuracy of the channel state information obtained.
The process of obtaining the target estimation sequence corresponding to the first OFDM symbol is described in several different embodiments below.
In one possible implementation manner, the second initial estimation values corresponding to the second pilot signals in the second initial estimation sequence may be respectively inserted between the first initial estimation values of the first pilot signals in the first initial estimation sequence; for example, according to the relationship between the subcarrier position corresponding to each second pilot signal and the subcarrier position corresponding to each first pilot signal, each second initial estimated value may be inserted between each first initial estimated value to obtain a target estimated sequence; also for example, each second initial estimated value may be sequentially inserted between each first initial estimated value, to obtain the target estimated sequence.
In another possible implementation manner, first initial estimated values corresponding to the first pilot signals in the first initial estimated sequence may be respectively inserted between second initial estimated values of the second pilot signals in the second initial estimated sequence; for example, according to the relationship between the subcarrier position corresponding to each first pilot signal and the subcarrier position corresponding to each first pilot signal, each first initial estimated value may be inserted between each second initial estimated value to obtain a target estimated sequence; also for example, each first initial estimated value may be sequentially inserted between each second initial estimated value, to obtain the target estimated sequence.
In another possible implementation manner, the first initial estimation sequence and the second initial estimation sequence may be corrected first to obtain a first corrected sequence and a second corrected sequence, and then each second corrected estimation value in the second corrected sequence is inserted between the first corrected estimation values in the first corrected sequence, or each first corrected estimation value in the first corrected sequence is inserted between the second corrected estimation values in the second corrected sequence, so as to obtain the target estimation sequence. The process of correcting the first initial estimation sequence and the second initial estimation sequence may be to perform frequency offset estimation and frequency offset compensation on the first initial estimation sequence and the second initial estimation sequence.
In another possible embodiment, similar to the previous embodiment, the difference is that only one of the first initial estimation sequence and the second initial estimation sequence is modified.
In the above embodiment, the first initial estimation sequence is obtained according to each first pilot signal in the first OFDM symbol, and the second initial estimation sequence is obtained according to each second pilot signal in the second OFDM symbol, where the subcarrier position corresponding to each first pilot signal is different from the subcarrier position corresponding to each second pilot signal; performing fusion processing on the second initial estimation sequence and the first initial estimation sequence to obtain a target estimation sequence corresponding to the first OFDM symbol; the method comprises the steps that subcarrier intervals corresponding to adjacent target estimated values in a target estimated sequence are smaller than subcarrier intervals corresponding to adjacent first initial estimated values in a first initial estimated sequence, and the target estimated sequence is used for estimating channel state information corresponding to a first OFDM symbol; by adopting the method, as the subcarrier interval corresponding to the adjacent target estimated value in the target estimated sequence is smaller than the subcarrier interval corresponding to the adjacent first initial estimated value in the first initial estimated sequence, the target estimated sequence contains more channel estimated values (namely target estimated values) compared with the first initial estimated sequence; in this way, when the target estimation sequence is used for estimating the channel state information corresponding to the first OFDM symbol, the available channel estimation value is increased, which is equivalent to that the number of available pilot signals is increased, so that the resolution of each CIR path in the time domain CIR is higher and the amplitude power is more concentrated according to the target estimation sequence, and the problem that the accuracy of the channel state information is lower due to the fact that the traditional method of estimating the channel state information corresponding to the first OFDM symbol by using the first initial estimation sequence is sparse because the first initial estimation value in the first initial estimation sequence, namely, the resolution of each CIR path in the time domain CIR is not high and the amplitude power concentration is not enough due to the sparse pilot signals in the first OFDM symbol, is avoided; according to the method and the device for estimating the channel state information, the channel state information corresponding to the first OFDM symbol is estimated by using the target estimation sequence, and the accuracy of channel state estimation is improved.
In one embodiment, based on the embodiment described in fig. 2, this embodiment relates to a process of performing fusion processing on the second initial estimation sequence and the first initial estimation sequence to obtain the target estimation sequence corresponding to the first OFDM symbol. This embodiment includes: and respectively inserting second initial estimated values of all second pilot signals in the second initial estimated sequence between first initial estimated values of all first pilot signals in the first initial estimated sequence to obtain a target estimated sequence.
In one possible implementation, please refer to fig. 4, which illustrates an equivalent pilot signal design after the fusion process of the second initial estimation sequence with the first initial estimation sequence. As shown in fig. 4, each second initial estimated value in the second initial sequence is inserted into the corresponding subcarrier position in the first OFDM symbol according to the subcarrier position corresponding to each second pilot signal, which corresponds to the channel initial estimated value twice the number in the first OFDM symbol.
In the embodiment illustrated in fig. 4, the subcarrier spacing corresponding to each adjacent target estimate in the target estimate sequence is equal. That is, the pilot signals corresponding to the obtained target estimation sequence are distributed at equal intervals, so that when the target estimation sequence is used for channel state estimation, the number of calculation points in the process of inverse Fourier transform can be reduced, the calculation complexity of the inverse Fourier transform can be reduced, and the calculation efficiency of the channel state estimation method can be improved when the target estimation sequence is converted into a time domain through inverse Fourier transform.
In another possible implementation manner, the subcarrier intervals corresponding to each adjacent target estimation value in the target estimation sequence may also be unequal.
In an embodiment, based on the embodiment described in fig. 2, the present embodiment relates to a process in which the target estimation sequence is further used to estimate channel state information corresponding to the second OFDM symbol. In this embodiment, the subcarrier spacing corresponding to the adjacent target estimation value in the target estimation sequence is smaller than the subcarrier spacing corresponding to the adjacent second initial estimation value in the second initial estimation sequence; the target estimation sequence is also used for estimating channel state information corresponding to the second OFDM symbol.
As shown in fig. 4, the target estimation sequence corresponding to the second OFDM symbol is identical to the target estimation sequence corresponding to the first OFDM symbol according to the method of obtaining the target estimation sequence provided in the foregoing embodiment; that is, the channel state information corresponding to the second OFDM symbol may be estimated with the target estimation sequence corresponding to the first OFDM symbol. In this embodiment, the number of initial channel estimation values for channel state information estimation corresponding to the second OFDM symbol also becomes large; in this way, when the target estimation sequence is used to estimate the channel state information corresponding to the second OFDM symbol, the number of pilot signals corresponding to the second OFDM symbol becomes larger, the interval between the pilot signals becomes smaller, and then the resolution of each CIR path in the time domain CIR corresponding to the second OFDM symbol is higher and the amplitude power is more concentrated according to the target estimation sequence, so that the obtained channel state information corresponding to the second OFDM symbol is more accurate.
In an embodiment, based on the embodiment described in fig. 2, the present embodiment relates to a process of performing fusion processing on the second initial estimation sequence and the first initial estimation sequence to obtain the target estimation sequence corresponding to the first OFDM symbol when the number of the second OFDM symbols is plural. Referring to fig. 5, an exemplary design for pilot signal insertion into OFDM subframe frequency domain in an OFDM-based wireless communication system is shown. As shown in fig. 5, the fusing processing of the second initial estimation sequence and the first initial estimation sequence to obtain a target estimation sequence corresponding to the first OFDM symbol may include: carrying out fusion processing on each second initial estimation sequence and the first initial estimation sequence to obtain a target estimation sequence corresponding to the first OFDM symbol; wherein, the subcarrier position corresponding to each second pilot signal in each second OFDM symbol is different from the subcarrier position corresponding to each first pilot signal in the first OFDM symbol.
In this embodiment, the target estimated sequence of the first OFDM symbol comprises three times the channel initial estimate compared to the first initial estimated sequence; in this way, when the target estimation sequence is used to estimate the channel state information corresponding to the first OFDM symbol, the accuracy is higher than when the first initial estimation sequence is used to estimate the channel state information corresponding to the first OFDM symbol.
In one embodiment, based on the embodiment described in fig. 2, the first OFDM symbol and the second OFDM symbol in this embodiment are located in the same target area in the target OFDM subframe, and the subcarrier positions corresponding to the pilot signals in the OFDM symbols in the target area are different.
Referring to fig. 6, an exemplary allocation diagram of pilot signals and data for a target OFDM subframe is shown. In fig. 6, the OFDM subframe includes 14 OFDM symbols, i.e., OFDM symbol 0 to OFDM symbol 13;12RbNum subcarriers, rbNum represents the number of effective RBs (Resource blocks) included in a transmission bandwidth, and REs 0 to RE (12 RbNum-1) correspond to indexes of each subcarrier; wherein OFDM symbols 0 to 6 are one target region, and OFDM symbols 7 to 13 are another target region. It can be seen that the distribution pattern of pilot signals between two target areas is the same, and the subcarrier positions corresponding to the pilot signals in each OFDM symbol in one target area are different.
Within the target region corresponding to OFDM symbol 0 through OFDM symbol 6, OFDM symbol 0 may be considered a first OFDM symbol and OFDM symbol 4 may be considered a second OFDM symbol; within the target region corresponding to OFDM symbols 7 to 13, OFDM symbol 7 may be regarded as a first OFDM symbol and OFDM symbol 13 may be regarded as a second OFDM symbol.
Pilot signal 0 on OFDM symbol 0 and pilot signal 2 on OFDM symbol 7 are equally spaced from RE0, with a spacing step of 6, i.e. the corresponding RE indices of pilot signal 0 on OFDM symbol 0 and pilot signal 2 on OFDM symbol 7 are {0,6,12,18, (12×rbnum-6) }; pilot signal 1 on OFDM symbol 4 and pilot signal 3 on OFDM symbol 11 are equally spaced from RE3 by a step size of 6, i.e., the corresponding RE indices of pilot signal 1 on symbol 4 and pilot signal 3 on OFDM symbol 11 are {3,9,15,21,..12×rbnum-3) }.
Received pilot sequences corresponding to OFDM symbol 0, OFDM symbol 4, OFDM symbol 7 and OFDM symbol 11, respectively
Local pilot sequences corresponding to OFDM symbol 0, OFDM symbol 4, OFDM symbol 7 and OFDM symbol 11>
Bringing into formula 1 to obtain initial estimated sequences of OFDM symbol 0, OFDM symbol 4, OFDM symbol 7 and OFDM symbol 11, respectively +.>
、/>
、/>
And->
Wherein->
。
And carrying out fusion processing on the initial estimated sequences of the OFDM symbols in the same target area to obtain target estimated sequences corresponding to the first OFDM symbols in each target area. The method specifically comprises the following steps: initial estimation sequence corresponding to OFDM symbol 4
An initial estimation sequence inserted into OFDM symbol 0>
The sub-carrier position corresponding to pilot signal 1, a target estimation sequence of OFDM symbol 0 is obtained >
Target estimation sequence->
Is 2N in sequence length. Similarly, the initial estimation sequence corresponding to OFDM symbol 11 is +.>
An initial estimation sequence inserted into OFDM symbol 7>
The sub-carrier position corresponding to pilot signal 1, a target estimation sequence of OFDM symbol 7 is obtained>
。
In one possible implementation, estimating channel state information corresponding to the first OFDM symbol using the target estimation sequence includes: performing inverse Fourier transform on the target estimation sequence to obtain a time domain channel impulse response corresponding to the first OFDM symbol; carrying out noise reduction treatment on the impulse response of the time domain channel to obtain a noise-reduced impulse response; and obtaining channel state information corresponding to the first OFDM symbol according to the impulse response after noise reduction.
For example, referring to fig. 6, the target estimation sequence corresponding to the OFDM symbol 0 and the target estimation sequence corresponding to the OFDM symbol 7 are respectively subjected to inverse fourier transform operation to obtain a time-domain non-noise-reduced CIR corresponding to the OFDM symbol 0 and a time-domain non-noise-reduced CIR corresponding to the OFDM symbol 7, which are respectively denoted as
And->
The method comprises the steps of carrying out a first treatment on the surface of the Wherein the number of points of the inverse Fourier transform
And->
And->
2N-related,/-related to the sequence length of (2)>
Equal to the minimum point +.>
To the power of 2, wherein>
。
Time domain non-noise reduced channel impulse responses for OFDM symbol 0 and OFDM symbol 7, respectively 
And
noise reduction processing is carried out to obtain channel impulse response +.>
And->
。
In one possible embodiment, a channel window of a length greater than or equal to the CIR is provided, and the exemplary window length of the channel window
Equal to->
One value between one quarter and one half; the CIR outside the channel window is considered as pure noise and can be set directly to 0;the CIR within the channel window is considered to be an effective multipath CIR and noise. For the noise reduction of the CIR in the channel window, a threshold can be set>
The CIR path larger than the threshold in the window is reserved, and the CIR path smaller than the threshold in the window is set to be 0, wherein the threshold is +.>
Can be obtained through simulation experiments. In other possible embodiments, other noise reduction methods may be used, and the method of how to perform noise reduction on the time domain CIR is not specifically limited in this application.
According to the channel impulse response after noise reduction
Channel state information such as channel length, channel envelope and the like corresponding to the OFDM symbol 0 can be estimated more accurately; correspondingly, according to the channel impulse response after noise reduction +.>
Channel state information such as channel length and channel envelope corresponding to the OFDM symbol 7 can be estimated more accurately.
In one possible implementation, the same channel state information is used for OFDM symbols located in the same target region, i.e. the channel state information corresponding to OFDM symbol 0 is used for all OFDM symbols 1 to 6.
Referring to fig. 7, another exemplary allocation scheme of pilot signals and data for a target OFDM subframe is shown. In fig. 7, the OFDM subframe includes 12 OFDM symbols, i.e., OFDM symbol 0 to OFDM symbol 11, 12RbNum subcarriers; wherein, OFDM symbols 0 to 5 are one target region, and OFDM symbols 6 to 11 are another target region. It can be seen that the distribution pattern of pilot signals between two target areas is the same, and the subcarrier positions corresponding to the pilot signals in each OFDM symbol in one target area are different.
Within the target region corresponding to OFDM symbol 0 through OFDM symbol 5, OFDM symbol 0 may be considered a first OFDM symbol and OFDM symbols 2 and 4 may be considered second OFDM symbols; within the target region corresponding to OFDM symbols 6 to 11, OFDM symbol 6 may be considered as a first OFDM symbol and OFDM symbols 8 and 10 may be considered as second OFDM symbols.
In another possible implementation manner, as shown in fig. 7, the OFDM subframe may also be divided into 3 target regions, where OFDM symbols 0 to 3 are one target region, OFDM symbols 4 to 7 are another target region, and OFDM symbols 8 to 11 are yet another target region; it can be seen that the distribution pattern of pilot signals between the three target areas is different, and the subcarrier positions corresponding to the pilot signals in two OFDM symbols in one target area are also different.
At this time, in the target area corresponding to OFDM symbol 0 to OFDM symbol 3, OFDM symbol 0 may be regarded as a first OFDM symbol and OFDM symbol 2 may be regarded as a second OFDM symbol; the subcarrier intervals corresponding to the target estimated values in the target estimated sequence corresponding to the first OFDM symbol in the target area are not equal. The first OFDM symbol and the second OFDM symbol in the other two target regions are similar to the division in the target region corresponding to OFDM symbol 0 to OFDM symbol 3, and are not described here again.
In one embodiment, please refer to fig. 8, which illustrates a flowchart of an exemplary channel state estimation method provided in an embodiment of the present application, which may be applied in the implementation environment shown in fig. 1. As shown in fig. 8, the method may include the steps of:
Wherein, the subcarrier position corresponding to each first pilot signal is different from the subcarrier position corresponding to each second pilot signal.
Optionally, the first OFDM symbol and the second OFDM symbol are located in the same target area in the target OFDM subframe, and the positions of subcarriers corresponding to pilot signals in each OFDM symbol in the target area are different.
The subcarrier interval corresponding to the adjacent target estimated value in the target estimated sequence is smaller than the subcarrier interval corresponding to the adjacent first initial estimated value in the first initial estimated sequence.
Optionally, the subcarrier intervals corresponding to each adjacent target estimated value in the target estimated sequence are equal.
Optionally, the target estimation sequence is further used for estimating channel state information corresponding to the second OFDM symbol; the subcarrier interval corresponding to the adjacent target estimated value in the target estimated sequence is smaller than the subcarrier interval corresponding to the adjacent second initial estimated value in the second initial estimated sequence.
Optionally, the number of the second OFDM symbols is a plurality, and at this time, the fusing processing is performed on the second initial estimation sequence and the first initial estimation sequence to obtain a target estimation sequence corresponding to the first OFDM symbol, including: and carrying out fusion processing on each second initial estimation sequence and the first initial estimation sequence to obtain a target estimation sequence.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a channel state estimation device for realizing the above related channel state estimation method. The implementation of the solution provided by the apparatus is similar to the implementation described in the above method, so the specific limitation in the embodiments of the channel state estimation apparatus provided below may be referred to the limitation of the channel state estimation method hereinabove, and will not be described herein.
In one embodiment, please refer to fig. 9, which shows a block diagram of a channel state estimation device provided in an embodiment of the present application. As shown in fig. 9, the channel state estimating apparatus includes: an acquisition module 902 and a fusion module 904, wherein:
an obtaining module 902, configured to obtain a first initial estimation sequence according to each first pilot signal in the first OFDM symbol, and obtain a second initial estimation sequence according to each second pilot signal in the second OFDM symbol, where a subcarrier position corresponding to each first pilot signal is different from a subcarrier position corresponding to each second pilot signal;
a fusion module 904, configured to fuse the second initial estimation sequence with the first initial estimation sequence to obtain a target estimation sequence corresponding to the first OFDM symbol;
The subcarrier interval corresponding to the adjacent target estimated value in the target estimated sequence is smaller than the subcarrier interval corresponding to the adjacent first initial estimated value in the first initial estimated sequence, and the target estimated sequence is used for estimating channel state information corresponding to the first OFDM symbol.
Based on the embodiment shown in fig. 9, in one embodiment, the fusion module 904 is specifically configured to insert second initial estimation values of each second pilot signal in the second initial estimation sequence between first initial estimation values of each first pilot signal in the first initial estimation sequence, so as to obtain a target estimation sequence.
Based on the embodiment shown in fig. 9, in one embodiment, the subcarrier intervals corresponding to each adjacent target estimation value in the target estimation sequence are equal.
Based on the embodiment shown in fig. 9, in one embodiment, the target estimation sequence is further used to estimate channel state information corresponding to the second OFDM symbol, where a subcarrier interval corresponding to an adjacent target estimation value in the target estimation sequence is smaller than a subcarrier interval corresponding to an adjacent second initial estimation value in the second initial estimation sequence.
Based on the embodiment shown in fig. 9, in one embodiment, the number of second OFDM symbols is a plurality; the fusion module 904 is specifically configured to fuse each second initial estimation sequence with the first initial estimation sequence to obtain a target estimation sequence.
Based on the embodiment shown in fig. 9, in one embodiment, the first OFDM symbol and the second OFDM symbol are located in the same target area in the target OFDM subframe, and the subcarrier positions corresponding to the pilot signals in the OFDM symbols in the target area are different.
On the basis of the embodiment shown in fig. 9, in one embodiment, the channel state estimation device further includes:
the transformation module is used for carrying out inverse Fourier transformation on the target estimation sequence to obtain a time domain channel impulse response corresponding to the first OFDM symbol;
the noise reduction module is used for carrying out noise reduction processing on the impulse response of the time domain channel to obtain a noise-reduced impulse response;
and the estimation module is used for obtaining channel state information corresponding to the first OFDM symbol according to the impulse response after noise reduction.
The respective modules in the above-described channel state estimation apparatus may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a communication device is provided, which may be a terminal or a base station side device, and the internal structure thereof may be as shown in fig. 10. The communication device includes a processor, a memory, an input/output interface, a communication interface, a display unit, and an input means. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input/output interface. Wherein the processor of the communication device is configured to provide computing and control capabilities. The memory of the communication device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The input/output interface of the communication device is used to exchange information between the processor and the external device. The communication interface of the communication device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a channel state estimation method. The display unit of the communication device is used for forming a visually visible picture and can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the communication equipment can be a touch layer covered on the display screen, can also be a key, a track ball or a touch pad arranged on the shell of the communication equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in fig. 10 is merely a block diagram of a portion of the structure associated with the present application and is not limiting of the communication device to which the present application is applied, and that a particular communication device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
In an embodiment, there is also provided a computer device comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the steps of the method embodiments described above when the computer program is executed.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, carries out the steps of the method embodiments described above.
In an embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the steps of the method embodiments described above.
It should be noted that, the user information (including, but not limited to, user equipment information, user personal information, etc.) and the data (including, but not limited to, data for analysis, stored data, presented data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party, and the collection, use and processing of the related data are required to comply with the related laws and regulations and standards of the related countries and regions.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the various embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (FerroelectricRandom Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the various embodiments provided herein may include at least one of relational databases and non-relational databases. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic units, quantum computing-based data processing logic units, etc., without being limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.
Claims (10)
1. A method of channel state estimation, the method comprising:
acquiring a first initial estimation sequence according to each first pilot signal in a first OFDM symbol, and acquiring a second initial estimation sequence according to each second pilot signal in a second OFDM symbol, wherein the positions of subcarriers corresponding to each first pilot signal are different from the positions of subcarriers corresponding to each second pilot signal, the number of the second OFDM symbols is a plurality, the first OFDM symbol and the second OFDM symbol are positioned in the same target area in a target OFDM subframe, and the positions of subcarriers corresponding to each pilot signal in each OFDM symbol in the target area are different;
Respectively inserting second initial estimated values of the second pilot signals in the second initial estimated sequences between first initial estimated values of the first pilot signals in the first initial estimated sequences to obtain target estimated sequences corresponding to the first OFDM symbols;
performing inverse Fourier transform on the target estimation sequence to obtain a time domain channel impulse response corresponding to the first OFDM symbol;
carrying out noise reduction treatment on the time domain channel impulse response to obtain a noise-reduced impulse response;
obtaining channel state information corresponding to the first OFDM symbol according to the noise-reduced impulse response;
the subcarrier interval corresponding to the adjacent target estimated value in the target estimated sequence is smaller than the subcarrier interval corresponding to the adjacent first initial estimated value in the first initial estimated sequence; the target estimation sequence is further configured to estimate channel state information corresponding to the second OFDM symbol, where a subcarrier interval corresponding to an adjacent target estimation value in the target estimation sequence is smaller than a subcarrier interval corresponding to an adjacent second initial estimation value in the second initial estimation sequence.
2. The method of claim 1, wherein the subcarrier spacing corresponding to each adjacent target estimate in the target estimate sequence is equal.
3. The method of claim 1 wherein each of said OFDM symbols within said target region uses the same said channel state information.
4. The method of claim 1, wherein the number of second OFDM symbols is 2.
5. A channel state estimation apparatus, the apparatus comprising:
the acquisition module is used for acquiring a first initial estimation sequence according to each first pilot signal in a first OFDM symbol, and acquiring a second initial estimation sequence according to each second pilot signal in a second OFDM symbol, wherein the positions of subcarriers corresponding to each first pilot signal are different from the positions of subcarriers corresponding to each second pilot signal, the number of the second OFDM symbols is multiple, the first OFDM symbol and the second OFDM symbol are positioned in the same target area in a target OFDM subframe, and the positions of subcarriers corresponding to each pilot signal in each OFDM symbol in the target area are different;
the fusion module is used for respectively inserting second initial estimated values of the second pilot signals in the second initial estimated sequences between first initial estimated values of the first pilot signals in the first initial estimated sequences to obtain target estimated sequences corresponding to the first OFDM symbols;
The transformation module is used for carrying out inverse Fourier transformation on the target estimation sequence to obtain a time domain channel impulse response corresponding to the first OFDM symbol;
the noise reduction module is used for carrying out noise reduction processing on the impulse response of the time domain channel to obtain a noise-reduced impulse response;
the estimation module is used for obtaining channel state information corresponding to the first OFDM symbol according to the impulse response after noise reduction;
the subcarrier interval corresponding to the adjacent target estimated value in the target estimated sequence is smaller than the subcarrier interval corresponding to the adjacent first initial estimated value in the first initial estimated sequence, the target estimated sequence is also used for estimating the channel state information corresponding to the second OFDM symbol, and the subcarrier interval corresponding to the adjacent target estimated value in the target estimated sequence is smaller than the subcarrier interval corresponding to the adjacent second initial estimated value in the second initial estimated sequence.
6. The apparatus of claim 5, wherein the subcarrier spacing for each adjacent target estimate in the target estimate sequence is equal.
7. The apparatus of claim 5, wherein each of the OFDM symbols within the target region uses the same channel state information.
8. The apparatus of claim 5, wherein the number of second OFDM symbols is 2.
9. A communication device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 4 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 4.
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