CN109088666A - Suitable for the signal combining method of multiple antennas, device, receiver and storage medium - Google Patents
Suitable for the signal combining method of multiple antennas, device, receiver and storage medium Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0848—Joint weighting
- H04B7/0857—Joint weighting using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
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- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
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Abstract
The embodiment of the invention discloses a kind of suitable for the signal combining method of multiple antennas, device, multiple antenna receiver and storage medium.Wherein, method includes: to obtain the reference signal of each antenna in more antennas received in signal and reception signal；According to the reception signal of reference signal and each antenna, the received noise power of each antenna is obtained；In the received noise power of each antenna, it is retained less than the received noise power equal to targets threshold, constitutes received noise power matrix；Using maximum-ratio combing MRC algorithm and received noise power matrix, the output signal of more antennas is calculated.Method provided in this embodiment can obtain maximum reception diversity gain and output signal-to-noise ratio.
Description
Technical Field
Embodiments of the present invention relate to communications technologies, and in particular, to a signal combining method and apparatus suitable for multiple antennas, a multiple antenna receiver, and a storage medium.
Background
The multi-antenna reception is a technique of receiving signals by using a plurality of antennas at a receiving end and combining the received signals by using a signal reception combining algorithm, and is used for improving the communication quality of a user or improving the communication efficiency. By combining the received signals of the antennas, the Signal to Interference Plus Noise Ratio (SINR) is maximized, and the diversity gain and the array gain can be obtained, thereby improving the coverage rate.
The inventor finds that the existing signal combining method has the defect that the maximum receiving diversity gain and the output signal-to-noise ratio are difficult to obtain in the research process of multi-antenna receiving.
Disclosure of Invention
The embodiment of the invention provides a signal combination method and device suitable for multiple antennas, a multiple-antenna receiver and a storage medium, so as to obtain the maximum receiving diversity gain and the maximum output signal-to-noise ratio.
In a first aspect, an embodiment of the present invention provides a signal combining method suitable for multiple antennas, including:
acquiring a receiving signal of each antenna in a plurality of antennas and a reference signal in the receiving signal;
obtaining the receiving noise power of each antenna according to the reference signal and the receiving signal of each antenna;
reserving the received noise power less than or equal to a target threshold value in the received noise power of each antenna to form a received noise power matrix;
and calculating output signals of the plurality of antennas by adopting a Maximum Ratio Combining (MRC) algorithm and a received noise power matrix.
In a second aspect, an embodiment of the present invention further provides a signal combining apparatus suitable for multiple antennas, including:
the device comprises an acquisition module, a processing module and a processing module, wherein the acquisition module is used for acquiring a receiving signal of each antenna in a plurality of antennas and a reference signal in the receiving signal;
the power calculation module is used for obtaining the received noise power of each antenna according to the reference signal and the received signal of each antenna;
the matrix calculation module is used for reserving the received noise power which is less than or equal to a target threshold value in the received noise power of each antenna to form a received noise power matrix;
and the output signal calculation module is used for calculating the output signals of the plurality of antennas by adopting a Maximum Ratio Combining (MRC) algorithm and a received noise power matrix.
In a third aspect, an embodiment of the present invention further provides a multi-antenna receiver, including:
one or more processors;
a plurality of antennas connected to the processor;
a memory for storing one or more programs;
when the one or more programs are executed by the one or more processors, the one or more processors implement the signal combining method for multiple antennas according to any of the embodiments.
In a fourth aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the signal combining method for multiple antennas according to any embodiment.
In the embodiment, the received noise power of each antenna is obtained by obtaining the received signal of each antenna in the plurality of antennas and the reference signal in the received signal; reserving the received noise power less than or equal to a target threshold value in the received noise power of each antenna to form a received noise power matrix; the maximum ratio combining MRC algorithm and the received noise power matrix are adopted to calculate the output signals of the multiple antennas, so that the antennas with higher noise power are removed, the remaining antennas with lower noise power are adopted to calculate the output signals, and the accuracy of the output signals can be effectively improved; moreover, if the received noise power larger than the target threshold exists, the signal-to-noise ratio among the antennas is unbalanced, and at the moment, the combining item with large noise is removed and the MRC algorithm is adopted, so that the maximum receiving diversity gain and the maximum output signal-to-noise ratio can be obtained.
Drawings
Fig. 1 is a flowchart of a signal combining method suitable for multiple antennas according to an embodiment of the present invention;
fig. 2 is a flowchart of a signal combining method suitable for multiple antennas according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a signal combining apparatus suitable for multiple antennas according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of a multi-antenna receiver according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a signal combining method applicable to multiple antennas according to an embodiment of the present invention, where the embodiment is applicable to a case where signals received by multiple antennas are combined at a receiving end, and the method may be executed by a signal combining apparatus applicable to multiple antennas, where the apparatus may be formed by hardware and/or software and is generally integrated in a multiple-antenna receiver, and specifically includes the following steps:
and S110, acquiring a received signal of each antenna in the plurality of antennas and a reference signal in the received signal.
In the mathematical simulation experiment, if the number of receiving antennas is M, the received signal Y is obtainedMCan be written as:
YM＝[Y0,Y1,…YM-1]T； (1)
receiving signal YMThe modeling formula of (c):
YM＝HMS+NM； (2)
wherein HMIs the frequency domain channel response, NMIs white noise, S (Signal) is a reference Signal (i.e., a transmission Signal)
The reference signal is a transmission signal of the transmitting end, and this embodiment is not limited to the number of antennas of the transmitting end, that is, the transmitting end may be a single antenna or a multiple antenna. The present embodiment may obtain a reference signal from the received signal of each antenna, where the reference signal in the present embodiment is a known signal.
And S120, obtaining the received noise power of each antenna according to the reference signal and the received signal of each antenna.
Here, the received noise power of each antenna is the power of the noise of the received signal of each antenna with respect to the reference signal, and is referred to as the received noise power.
S130, a received noise power matrix is formed by retaining the received noise power equal to or less than the target threshold value among the received noise powers of the antennas.
The larger the received noise power is, the more serious the signal distortion is, which reflects that the signal receiving quality of the antenna is poor. In this embodiment, if the received noise power is greater than the target threshold, the received noise power is deleted, thereby improving the accuracy of the received noise power matrix.
Optionally, the average value of the received noise power of each antenna is usedA sum with a specified decibel value as a target threshold, wherein the specified decibel value can be a multiple of the average value, such as 5 times, 10 times, etc.; deleting the received noise power larger than the target threshold value to obtain the received noise power smaller than or equal to the target threshold value; and sequentially taking the received noise power less than or equal to the target threshold as diagonal elements of the received noise power matrix.
Wherein the specified decibel value can be 10 times, 20 times, etc. the average value. If the received noise power is larger than the target threshold, the received noise power is far larger than the average valueThe received noise power is removed and accordingly the row and column in which the noise power is located.
Suppose that the reception noise power of the ith antenna is deleted and the reception noise power of the remaining M-1 antennas constitutes a reception noise power matrix RuuThe following were used:
wherein,representing the received noise of the ith antenna and, accordingly,representing the mth antenna reception noise.
And S140, calculating output signals of the plurality of antennas by adopting a Maximum Ratio Combining (MRC) algorithm and a received noise power matrix.
The Maximum Ratio Combining (MRC) algorithm is the optimal choice in the diversity Combining technique, and can obtain the best performance compared with the selection Combining and equal Gain Combining, and the performance improvement is determined by the higher signal-to-noise Ratio brought by Array Gain, and further the better error rate characteristic.
Specifically, assume that the output signals of the plurality of antennas areCalculating the output signal using equation (4)
Wherein H is the channel estimation of the reference signals on a plurality of antennas, (-)HFor conjugate transpose, Y is the received signal over multiple antennas.
In the embodiment, the received noise power of each antenna is obtained by obtaining the received signal of each antenna in the plurality of antennas and the reference signal in the received signal; reserving the received noise power less than or equal to a target threshold value in the received noise power of each antenna to form a received noise power matrix; the maximum ratio combining MRC algorithm and the received noise power matrix are adopted to calculate the output signals of the multiple antennas, so that the antennas with higher noise power are removed, the remaining antennas with lower noise power are adopted to calculate the output signals, and the accuracy of the output signals can be effectively improved; moreover, if the received noise power larger than the target threshold exists, the signal-to-noise ratio among the antennas is unbalanced, and at the moment, the combining item with large noise is removed and the MRC algorithm is adopted, so that the maximum receiving diversity gain and the maximum output signal-to-noise ratio can be obtained.
Example two
Fig. 2 is a flowchart of a signal combining method suitable for multiple antennas according to a second embodiment of the present invention, which is further optimized based on the above embodiment, specifically, the step of "obtaining the received noise power of each antenna according to the reference signal and the received signal of each antenna" is optimized, and includes the following steps:
s210, obtaining a receiving signal of each antenna in the plurality of antennas and a reference signal in the receiving signal.
And S220, calculating the received noise power of each antenna on each subcarrier in the plurality of subcarriers according to the reference signal and the received signal of each antenna.
Multicarrier Modulation (Multicarrier Modulation) employs multiple carrier signals. It splits the data stream into several sub-streams, so that the sub-streams have a much lower transmission bit rate, and uses these data to modulate several carriers, respectively. Optionally, the step includes the following three steps:
the first step is as follows: calculating channel estimation H of reference signal on each antenna according to reference signal and received signal of each antennaM，LS。
Optionally, the channel estimation includes a non-blind channel estimation method, a blind channel estimation method, and a semi-blind channel estimation method. The embodiment adopts a non-blind channel estimation method, and recovers a channel matrix H based on information of a received signal and a reference signalM，LS. Alternatively, H is calculated using a Least squares (Least Square) algorithm in the non-blind channel estimation methodM，LS。
Further optionally, H is according to formula (5)M，LSFiltering and denoising to obtain HM，DN。
HM，DN＝W*HM，LS； (5)
Where W is the filter.
The second step is that: and calculating the received noise power of each antenna on each subcarrier in the plurality of subcarriers according to the reference signal, the received signal of each antenna and the channel estimation of the reference signal on each antenna.
Specifically, the reception noise of each antenna on each of the plurality of subcarriers is calculated using equation (6)Power sigma2(p，k)。
σ2(p，k)＝|Ypilot(p,k)-Hpilot(p,k)*S(p,k)|2； (6)
Where, p is 0, 1, …, M-1, M. k is the frequency domain number, i.e. the subcarrier number, and pilot represents the reference signal. Hpilot(p, k) is HM，DNOr HM，LSElement (ii) of (1), Hpilot(p, k) represents the channel estimation of the p-th antenna on the k-th subcarrier in the case that the transmission signal is a reference signal. Y ispilot(p, k) represents a reception signal of the p-th antenna on the k-th subcarrier in the case where the transmission signal is a reference signal. S (p, k) represents a reference signal of the pth antenna on the kth subcarrier.
And S230, obtaining the received noise power of each antenna according to the received noise power of each antenna on each subcarrier in the plurality of subcarriers.
Optionally, the received noise power of each antenna on a plurality of subcarriers is averaged to obtain the received noise power of each antenna. The method specifically comprises the following two optional embodiments:
a first alternative embodiment: grouping a plurality of subcarriers to obtain a plurality of frequency domain resource blocks; and averaging the received noise power on the subcarriers in each frequency domain resource block for each antenna to obtain the received noise power of each antenna on each frequency domain resource block.
Optionally, the multiple subcarriers are windowed in the frequency domain to be uniformly divided into multiple groups, so as to obtain multiple frequency domain resource blocks, where the number of subcarriers included in each frequency domain resource block is the Window Length (WL). For example, 128 subcarriers are shared, and the sequence number k is 0 … … 127. The 128 sub-carriers are equally divided into 8 frequency domain resource blocks, the sequence number j is 0 … … 7, and each frequency domain resource block comprises 16 sub-carriers.
Specifically, the noise power sigma of the p-th antenna on the j-th frequency domain resource block is calculated by adopting the formula (7)2(p,j)。
Wherein,NDFT is the total number of subcarriers.
In general, the electromagnetic environment of communication is very complex, the communication conditions are relatively poor, and interference with various modes and time-varying statistical characteristics exists. Among these interferences, high-power narrowband interference has become one of the most important factors to destroy the survivability of the communication system. When the narrow-band interference is just orthogonal to the sub-carrier, the interference of the narrow-band interference to other sub-carriers is 0, and when the narrow-band interference is not orthogonal to the sub-carrier, the non-orthogonal narrow-band interference can spread in the whole frequency range, and a plurality of sub-carriers are influenced in a large bandwidth range, so that the output signal-to-noise ratio of the sub-carrier close to the narrow-band noise signal is sharply reduced. By carrying out windowing average processing on a plurality of subcarriers, the influence of narrowband interference on the subcarriers can be reduced, and the influence of the narrowband interference on noise of other subcarriers can be isolated, so that the noise estimation of other subcarriers is more accurate when the narrowband interference exists.
Second alternative embodiment: for each antenna, the received noise power over a plurality of subcarriers is averaged to obtain the average received noise power over a plurality of subcarriers for each antenna.
Optionally, in equation (7), the total number of subcarriers is equal to the window length, and the average received noise power σ of each antenna over a plurality of subcarriers is obtained2(p)。
It should be noted that, before grouping the multiple subcarriers to obtain multiple frequency-domain resource blocks, the method further includes: judging whether the noise of the received signal is white noise or colored noise; the first alternative embodiment is implemented if the noise of the received signal is colored noise. The first embodiment or the second embodiment may be performed if the noise of the received signal is white noise (e.g., white gaussian noise), and the window length may be increased appropriately if the first embodiment is performed.
Here, the noise of the reception signal refers to noise generated due to the influence of the communication environment. In practical application, the communication environment needs to be comprehensively analyzed to obtain the noise of the received signal. In the mathematical simulation experiment, white noise or colored noise can be added on the basis of the received signal. Because the power spectral density of the white noise is uniformly distributed in the whole frequency domain, correspondingly, the white noise is uniformly distributed on a plurality of subcarriers, if the noise of the received signal is the white noise, the received noise power on the plurality of subcarriers is directly averaged without grouping the subcarriers; of course, the window length may be increased appropriately to reduce the number of packets. Unlike white noise, the power spectral density distribution of colored noise is not uniform, and accordingly, the distribution of colored noise on a plurality of subcarriers is not uniform, and if the noise of the received signal is colored noise, the first embodiment is adopted to improve the calculation accuracy of the received noise power on each subcarrier.
S240, a received noise power matrix is formed by retaining the received noise power equal to or less than the target threshold value among the received noise powers of the antennas.
Specifically, for the received noise power of each antenna on each frequency domain resource block, if the received noise power on any one frequency domain resource block is greater than the target threshold, the received noise power of the antenna on each frequency domain resource block is deleted.
For the average received noise power of each antenna over a plurality of subcarriers, if the average received noise power is greater than the target threshold, the average received noise power of the antenna over the plurality of subcarriers is cancelled.
And S250, calculating output signals of the multiple antennas by adopting a Maximum Ratio Combining (MRC) algorithm and a received noise power matrix.
The following describes the signal combining method for multiple antennas in this embodiment in detail.
Assuming that the number of antennas is 2, the received signals of the antennas are Y1 and Y2, respectively, and then the channel estimation of the reference signal on the 1 st antenna is as follows:channel estimation of reference signal on 2 nd antenna:
channel estimation after denoising:and
calculating the received noise power of each antenna on each subcarrier in a plurality of subcarriers:
σ2(0,k)＝|Ypilot(0,k)-Hpilot(0,k)*S(0,k)|2； (8)
σ2(1,k)＝|Ypilot(1,k)-Hpilot(1,k)*S(1,k)|2； (9)
calculating the received noise power of two antennas on each frequency domain resource block:
if the received noise power of the two antennas on each frequency domain resource block is less than or equal to the received noise power of the target threshold, the noise power of the two antennas is similar, and the MRC algorithm is adopted to carry out signal combination:
wherein, (.)*Is conjugated.
If the 2 nd antenna has noise sigma on any frequency domain resource block2(1, j) is larger than a target threshold value or is far larger than the noise sigma of the 1 st antenna on the same frequency domain resource block2(0, j), then the 2 nd antenna is deleted, the output signal combining of the multiple antennas degrades to selective receive combining:
similarly, assuming that the number of antennas is 3, the noise σ of the 3 rd antenna on any frequency domain resource block2(2, j) is greater than a target threshold value or is far greater than noise sigma of the first antenna and the second antenna on the same frequency resource block2(1, j) and σ2(0, j), then the 3 rd antenna is deleted, the multi-antenna output signal combining degrades to 2 antenna combining:
EXAMPLE III
Fig. 3 is a schematic structural diagram of a signal combining apparatus suitable for multiple antennas according to a third embodiment of the present invention, including: an acquisition module 31, a power calculation module 32, a matrix calculation module 33 and an output signal calculation module 34.
An obtaining module 31, configured to obtain a received signal of each of the multiple antennas and a reference signal in the received signal;
a power calculation module 32, configured to obtain the received noise power of each antenna according to the reference signal and the received signal of each antenna;
a matrix calculation module 33, configured to reserve, in the received noise power of each antenna, a received noise power smaller than or equal to a target threshold to form a received noise power matrix;
and an output signal calculation module 34, configured to calculate output signals of the multiple antennas by using a maximum ratio combining MRC algorithm and a received noise power matrix.
In the embodiment, the received noise power of each antenna is obtained by obtaining the received signal of each antenna in the plurality of antennas and the reference signal in the received signal; reserving the received noise power less than or equal to a target threshold value in the received noise power of each antenna to form a received noise power matrix; the maximum ratio combining MRC algorithm and the received noise power matrix are adopted to calculate the output signals of the multiple antennas, so that the antennas with higher noise power are removed, the remaining antennas with lower noise power are adopted to calculate the output signals, and the accuracy of the output signals can be effectively improved; moreover, if the received noise power larger than the target threshold exists, the signal-to-noise ratio among the antennas is unbalanced, and at the moment, the combining item with large noise is removed and the MRC algorithm is adopted, so that the maximum receiving diversity gain and the maximum output signal-to-noise ratio can be obtained.
Optionally, the matrix calculation module 33 may reserve the received noise power less than or equal to the target threshold in the received noise power of each antenna, and when the received noise power matrix is formed, specifically configured to: taking the sum of the average value of the received noise power of each antenna and the specified decibel value as a target threshold value; deleting the received noise power larger than the target threshold value to obtain the received noise power smaller than or equal to the target threshold value; and sequentially taking the received noise power less than or equal to the target threshold as diagonal elements of the received noise power matrix.
Optionally, when the power calculation module 32 obtains the received noise power of each antenna according to the reference signal and the received signal of each antenna, it is specifically configured to: calculating the received noise power of each antenna on each subcarrier in a plurality of subcarriers according to the reference signal and the received signal of each antenna; and obtaining the received noise power of each antenna according to the received noise power of each antenna on each subcarrier in the plurality of subcarriers.
Optionally, when the power calculation module 32 obtains the received noise power of each antenna according to the received noise power of each antenna on each subcarrier in the multiple subcarriers, it is specifically configured to: grouping a plurality of subcarriers to obtain a plurality of frequency domain resource blocks; and averaging the received noise power on the subcarriers in each frequency domain resource block for each antenna to obtain the received noise power of each antenna on each frequency domain resource block.
Optionally, the apparatus further comprises: the judging module is used for judging the noise of the received signal to be white noise or colored noise before grouping the plurality of subcarriers to obtain a plurality of frequency domain resource blocks; if the noise of the received signal is colored noise, the grouping of the plurality of subcarriers is performed by the power calculation module 32.
Optionally, when the power calculation module 32 obtains the received noise power of each antenna according to the reference signal and the received signal of each antenna, it is specifically configured to: for each antenna, the received noise power over a plurality of subcarriers is averaged to obtain the average received noise power over a plurality of subcarriers for each antenna.
Optionally, when the power calculating module 32 calculates the received noise power of each antenna on each subcarrier in the multiple subcarriers according to the reference signal and the received signal of each antenna, it is specifically configured to: calculating channel estimation of the reference signal on each antenna according to the reference signal and the receiving signal of each antenna; and calculating the received noise power of each antenna on each subcarrier in the plurality of subcarriers according to the reference signal, the received signal of each antenna and the channel estimation of the reference signal on each antenna.
The signal combining device applicable to multiple antennas provided by the embodiment of the invention can execute the signal combining method applicable to multiple antennas provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
Example four
Fig. 4 is a schematic structural diagram of a multi-antenna receiver according to a fourth embodiment of the present invention, as shown in fig. 4, the multi-antenna receiver includes a processor 40, a memory 41, and a plurality of antennas 42, and fig. 4 shows 3 antennas. The number of processors 40 in the multi-antenna receiver may be one or more, and one processor 40 is taken as an example in fig. 4; the processor 40, the memory 41, and the plurality of antennas 42 in the multi-antenna receiver may be connected by a bus or other means, and fig. 4 illustrates the connection by the bus as an example.
The memory 41 serves as a computer-readable storage medium, and may be used for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the signal combining method applicable to multiple antennas in the embodiment of the present invention (for example, the acquisition module 31, the power calculation module 32, the matrix calculation module 33, and the output signal calculation module 34 in the signal combining apparatus applicable to multiple antennas). The processor 40 executes software programs, instructions and modules stored in the memory 41 to perform various functional applications and data processing of the multi-antenna receiver, namely, to implement the signal combining method suitable for multiple antennas.
The memory 41 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 41 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, memory 41 may further include memory located remotely from processor 40, which may be connected to the multi-antenna receiver over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
EXAMPLE five
An embodiment of the present invention also provides a computer-readable storage medium having stored thereon a computer program, which when executed by a computer processor is configured to perform a signal combining method suitable for multiple antennas, the method including:
acquiring a receiving signal of each antenna in a plurality of antennas and a reference signal in the receiving signal;
obtaining the receiving noise power of each antenna according to the reference signal and the receiving signal of each antenna;
reserving the received noise power less than or equal to a target threshold value in the received noise power of each antenna to form a received noise power matrix;
and calculating output signals of the plurality of antennas by adopting a Maximum Ratio Combining (MRC) algorithm and a received noise power matrix.
Of course, the computer program provided by the embodiments of the present invention is not limited to the above method operations, and may also perform related operations in the signal combining method for multiple antennas provided by any embodiments of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the embodiment of the signal combining apparatus applicable to multiple antennas, the included units and modules are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A signal combining method for multiple antennas, comprising:
acquiring a receiving signal of each antenna in a plurality of antennas and a reference signal in the receiving signal;
obtaining the receiving noise power of each antenna according to the reference signal and the receiving signal of each antenna;
reserving the received noise power less than or equal to a target threshold value in the received noise power of each antenna to form a received noise power matrix;
and calculating output signals of the plurality of antennas by adopting a Maximum Ratio Combining (MRC) algorithm and a received noise power matrix.
2. The method according to claim 1, wherein the retaining the received noise power equal to or less than the target threshold among the received noise powers of the antennas to form a received noise power matrix comprises:
taking the sum of the average value of the received noise power of each antenna and the specified decibel value as a target threshold value;
deleting the received noise power larger than the target threshold value to obtain the received noise power smaller than or equal to the target threshold value;
and sequentially taking the received noise power less than or equal to the target threshold as diagonal elements of the received noise power matrix.
3. The method of claim 1, wherein obtaining the received noise power of each antenna according to the reference signal and the received signal of each antenna comprises:
calculating the received noise power of each antenna on each subcarrier in a plurality of subcarriers according to the reference signal and the received signal of each antenna;
and obtaining the received noise power of each antenna according to the received noise power of each antenna on each subcarrier in the plurality of subcarriers.
4. The method of claim 3, wherein obtaining the received noise power of each antenna according to the received noise power of each antenna on each subcarrier of the plurality of subcarriers comprises:
grouping a plurality of subcarriers to obtain a plurality of frequency domain resource blocks;
and averaging the received noise power on the subcarriers in each frequency domain resource block for each antenna to obtain the received noise power of each antenna on each frequency domain resource block.
5. The method of claim 4, wherein before grouping the plurality of subcarriers into the plurality of frequency domain resource blocks, further comprising:
judging whether the noise of the received signal is white noise or colored noise;
if the noise of the received signal is colored noise, an operation of grouping the plurality of subcarriers is performed.
6. The method of claim 3, wherein obtaining the received noise power of each antenna according to the received noise power of each antenna on each subcarrier of the plurality of subcarriers comprises:
for each antenna, the received noise power over a plurality of subcarriers is averaged to obtain the average received noise power over a plurality of subcarriers for each antenna.
7. The method of claim 3, wherein calculating the received noise power of each antenna on each subcarrier of the plurality of subcarriers based on the reference signal and the received signal of each antenna comprises:
calculating channel estimation of the reference signal on each antenna according to the reference signal and the receiving signal of each antenna;
and calculating the received noise power of each antenna on each subcarrier in the plurality of subcarriers according to the reference signal, the received signal of each antenna and the channel estimation of the reference signal on each antenna.
8. A signal combining apparatus adapted for multiple antennas, comprising:
the device comprises an acquisition module, a processing module and a processing module, wherein the acquisition module is used for acquiring a receiving signal of each antenna in a plurality of antennas and a reference signal in the receiving signal;
the power calculation module is used for obtaining the received noise power of each antenna according to the reference signal and the received signal of each antenna;
the matrix calculation module is used for reserving the received noise power which is less than or equal to a target threshold value in the received noise power of each antenna to form a received noise power matrix;
and the output signal calculation module is used for calculating the output signals of the plurality of antennas by adopting a Maximum Ratio Combining (MRC) algorithm and a received noise power matrix.
9. A multiple antenna receiver, comprising:
one or more processors;
a plurality of antennas connected to the processor;
a memory for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the signal combining method for multiple antennas as recited in any one of claims 1-7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a signal combining method for multiple antennas according to any one of claims 1 to 7.
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