CN111416674A - SNR (signal to noise ratio) measuring method and device before and after multi-antenna receiving forming - Google Patents
SNR (signal to noise ratio) measuring method and device before and after multi-antenna receiving forming Download PDFInfo
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- CN111416674A CN111416674A CN202010146447.5A CN202010146447A CN111416674A CN 111416674 A CN111416674 A CN 111416674A CN 202010146447 A CN202010146447 A CN 202010146447A CN 111416674 A CN111416674 A CN 111416674A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
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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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
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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
- H04B7/086—Weighted combining using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming
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Abstract
The invention discloses a method and a device for measuring SNR before and after multi-antenna shaping, which belongs to the technical field of communication, in particular to a method for measuring SNR before and after multi-antenna shaping, and comprises the following steps: carrying out beam forming processing on the array antenna; synchronizing signals after shaping and combining, extracting a preamble synchronization sequence of each antenna, obtaining a signal-to-noise ratio value of each antenna according to the preamble synchronization sequence and a local synchronization sequence, and calculating a total signal-to-noise ratio value before receiving beam shaping according to the obtained signal-to-noise ratio value of each antenna; and extracting the data segment preamble synchronous sequence of each antenna, and calculating the total signal-to-noise ratio value after the received wave beam is shaped according to the data segment preamble synchronous sequence. The technical scheme provided by the invention can effectively calculate the total signal-to-noise ratio value before and after the shaping of the received beam, and has the advantages of high accuracy of the calculation result, simple operation of the method and easy implementation.
Description
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a method and a device for measuring SNR before and after multi-antenna shaping.
Background
With the rapid development of network technology, multimedia is used as a carrier for transmitting information such as numbers, characters, sounds, graphics and the like, and a technology for comprehensively processing sound, text and graphics information by a computer with integration, real-time performance and interactivity has been widely popularized and applied. The transmission of multimedia data signals has become an essential part of wireless communication networks.
At present, the user equipment in the communication system often needs to report the channel state information to the base station equipment. Therefore, the UE needs to estimate the current channel condition and obtain the channel estimation result of the pilot used for calculating the SNR, which generally needs to perform delay spread estimation, velocity estimation and SNR estimation.
The inventor of the present invention has found that the SNR estimated in the prior art is not accurate enough.
Disclosure of Invention
In order to solve at least the above technical problems, the present invention provides a method and an apparatus for SNR measurement before and after multi-antenna receive forming.
According to a first aspect of the present invention, there is provided a method for measuring SNR before and after multi-antenna receive forming, comprising:
carrying out beam forming processing on the array antenna;
synchronizing signals after shaping and combining, extracting a preamble synchronization sequence of each antenna, obtaining a signal-to-noise ratio value of each antenna according to the preamble synchronization sequence and a local synchronization sequence, and calculating a total signal-to-noise ratio value before receiving beam shaping according to the obtained signal-to-noise ratio value of each antenna;
and extracting the data segment preamble synchronous sequence of each antenna, and calculating the total signal-to-noise ratio value after the received wave beam is shaped according to the data segment preamble synchronous sequence.
Further, the method further comprises: and screening out the damaged antenna according to the signal-to-noise ratio value of each antenna.
Further, the screening out the damaged antennas according to the snr values of the antennas includes: and judging the signal-to-noise ratio value of each antenna, and judging that the antenna is damaged under the condition that the signal-to-noise ratio value of the antenna is smaller than the average signal-to-noise ratio value.
Further, the method further comprises: and calculating a beam forming factor according to the data segment preamble synchronous sequence of each antenna, and performing weighting combination on the received signals according to the beam forming factor to obtain a new signal-to-noise ratio value.
Further, the method further comprises: and calculating the forming gain according to the total signal-to-noise ratio value before the receiving wave beam forming and the total signal-to-noise ratio value after the receiving wave beam forming.
Further, the calculating a forming gain according to the total snr value before the receive beamforming and the total snr value after the receive beamforming includes:
and subtracting the total signal-to-noise ratio value after the receiving wave beam shaping and the total signal-to-noise ratio value before the receiving wave beam shaping, and taking the obtained calculation result as shaping gain.
Further, the synchronizing the signals after the forming and combining, extracting the preamble synchronization sequence of each antenna, obtaining the signal-to-noise ratio value of each antenna according to the preamble synchronization sequence and the local synchronization sequence, and calculating the total signal-to-noise ratio value before the receiving beam forming according to the obtained signal-to-noise ratio value of each antenna includes:
synchronizing the signals after shaping and combining, extracting a preamble synchronization sequence of each antenna after synchronization is determined, performing vector subtraction according to the received synchronization sequence and a local synchronization sequence to obtain the signal-to-noise ratio value of each antenna, and calculating the total signal-to-noise ratio value before receiving beam shaping according to the obtained signal-to-noise ratio value of each antenna.
According to a second aspect of the present invention, there is provided a SNR measuring apparatus before and after multi-antenna receive forming, comprising:
the shaping module is used for carrying out beam shaping processing on the array antenna;
the first signal-to-noise ratio value calculation module is used for synchronizing the signals after the forming combination, extracting the preamble synchronization sequence of each antenna, obtaining the signal-to-noise ratio value of each antenna according to the preamble synchronization sequence and the local synchronization sequence, and calculating the total signal-to-noise ratio value before the receiving wave beam forming according to the obtained signal-to-noise ratio value of each antenna;
and the second signal-to-noise ratio value calculation module is used for extracting the data segment preamble synchronous sequence of each antenna and calculating the total signal-to-noise ratio value after the received wave beam is shaped according to the data segment preamble synchronous sequence.
According to a third aspect of the invention, there is provided a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor,
the processor, when executing the program, performs the steps of the method as in any one of the above.
According to a fourth aspect of the present invention, there is provided a computer readable storage medium storing a program which, when executed, is capable of implementing a method as defined in any one of the above.
The invention has the beneficial effects that: the method has the advantages that the beam forming processing is carried out on the array antennas, the useful signal power is improved, signals after forming and combining are synchronized, the preamble synchronous sequences of the antennas are extracted, the signal-to-noise ratio value of each antenna is obtained according to the preamble synchronous sequences and the local synchronous sequences, the total signal-to-noise ratio value before beam forming is received is calculated, and the total signal-to-noise ratio value after beam forming is received is calculated according to the data segment preamble synchronous sequences extracted from the antennas.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which,
fig. 1 is a flowchart of an SNR measurement method before and after multi-antenna receive forming according to the present invention;
fig. 2 is a schematic diagram of an SNR measuring apparatus before and after multi-antenna receive forming according to the present invention;
fig. 3 is a constellation diagram before beam forming corresponding to the receiving antenna 1 provided by the present invention;
fig. 4 is a constellation diagram before beam forming corresponding to the receiving antenna 2 provided by the present invention;
fig. 5 is a constellation diagram before beam forming corresponding to the receiving antenna 3 provided by the present invention;
fig. 6 is a constellation diagram before beam forming corresponding to the receiving antenna 4 provided by the present invention;
fig. 7 is a constellation diagram after beamforming of 4 antennas provided by the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
In a first aspect of the present invention, there is provided a method for measuring SNR before and after multi-antenna receive forming, as shown in fig. 1, including:
step 201: carrying out beam forming processing on the array antenna;
in the embodiment of the present invention, in the case that the array antenna receives the received signal, the received signal is subjected to receive shaping according to the last shaping factor, and further, after the received signal is received, the received signal is subjected to pre-shaping weighting combination through weighting combination, where the pre-stored shaping weighting factors w1, w2, and … wka are used as the shaping weighting factors, so that a main beam is formed on the useful signal.
In the embodiment of the invention, because the data required by the estimation of the optimal solution is noisy, the method of synchronization after weighting and combining is adopted, which is beneficial to improving the power of the useful signal.
Step 202: synchronizing signals after shaping and combining, extracting a preamble synchronization sequence of each antenna, obtaining a signal-to-noise ratio value of each antenna according to the preamble synchronization sequence and a local synchronization sequence, and calculating a total signal-to-noise ratio value before receiving beam shaping according to the obtained signal-to-noise ratio value of each antenna;
in the embodiment of the invention, the received signal is shaped, and a vector subtraction method is adopted to obtain a noise signal according to the shaped received signal and a local reference signal. Furthermore, vector subtraction is carried out on the shaped received signal and a local reference signal, and an obtained calculation result is used as a noise signal.
That is, the received signal is shaped according to the last shaping factor, the signals after shaping and combining are synchronized, after synchronization is determined, preamble synchronization sequences of respective antennas are extracted, and then SNR values SNR1, SNR 2.
In the embodiment of the invention, the method for calculating the signal-to-noise ratio before the received beam forming is as follows:
amp＝mean(rms(xka(k)))./rms(d(k)),,ka＝1,2,...KA
d(k)＝d(k)*amp
Noisema(k)＝xka(k)-d(k)
further obtaining the signal-to-noise ratio before receiving beam forming
In another embodiment of the present invention, the damaged antenna can be selected according to the obtained snr value of each antenna. And further, the signal-to-noise ratio value of each antenna is judged, and under the condition that the signal-to-noise ratio value of the antenna is smaller than the average signal-to-noise ratio value, the antenna is judged to be damaged and is not used any more subsequently. That is, according to the magnitude of the SNR, it is determined whether there is a case where the SNR is significantly lower than the average SNR, and if so, it indicates that the antenna is damaged and is not used any more subsequently.
For example: the SNR measurement results of the 4 antennas are average values of SNR _ meas ═ 3.985313.647613.164212.6080, -3.9853 significantly smaller than-3.985313.647613.164212.6080, respectively, and thus it is judged that the first antenna is damaged.
Step 203: extracting data segment preamble synchronous sequences of respective antennas, and calculating a total signal-to-noise ratio value after receiving beam forming according to the data segment preamble synchronous sequences;
in the embodiment of the invention, the method for calculating the signal-to-noise ratio after the received beam forming comprises the following steps:
Noise_bf(k)＝d(k)-y(k)
signal-to-noise ratio of after received beam forming is
In another embodiment of the present invention, there is provided an SNR measuring method including:
carrying out beam forming processing on the array antenna;
synchronizing signals after shaping and combining, extracting a preamble synchronization sequence of each antenna, obtaining a signal-to-noise ratio value of each antenna according to the preamble synchronization sequence and a local synchronization sequence, and calculating a total signal-to-noise ratio value before receiving beam shaping according to the obtained signal-to-noise ratio value of each antenna;
and extracting the data segment preamble synchronous sequence of each antenna, and calculating the total signal-to-noise ratio value after the received wave beam is shaped according to the data segment preamble synchronous sequence.
Further, the method further comprises: and screening out the damaged antenna according to the signal-to-noise ratio value of each antenna.
Further, the screening out the damaged antennas according to the snr values of the antennas includes: and judging the signal-to-noise ratio value of each antenna, and judging that the antenna is damaged under the condition that the signal-to-noise ratio value of the antenna is smaller than the average signal-to-noise ratio value.
Further, the method further comprises: and calculating a beam forming factor according to the data segment preamble synchronous sequence of each antenna, and performing weighting combination on the received signals according to the beam forming factor to obtain a new signal-to-noise ratio value.
Further, the method further comprises: and calculating the forming gain according to the total signal-to-noise ratio value before the receiving wave beam forming and the total signal-to-noise ratio value after the receiving wave beam forming.
Further, the calculating a forming gain according to the total snr value before the receive beamforming and the total snr value after the receive beamforming includes:
and subtracting the total signal-to-noise ratio value after the receiving wave beam shaping and the total signal-to-noise ratio value before the receiving wave beam shaping, and taking the obtained calculation result as shaping gain.
Further, the synchronizing the signals after the forming and combining, extracting the preamble synchronization sequence of each antenna, obtaining the signal-to-noise ratio value of each antenna according to the preamble synchronization sequence and the local synchronization sequence, and calculating the total signal-to-noise ratio value before the receiving beam forming according to the obtained signal-to-noise ratio value of each antenna includes:
synchronizing the signals after shaping and combining, extracting a preamble synchronization sequence of each antenna after synchronization is determined, performing vector subtraction according to the received synchronization sequence and a local synchronization sequence to obtain the signal-to-noise ratio value of each antenna, and calculating the total signal-to-noise ratio value before receiving beam shaping according to the obtained signal-to-noise ratio value of each antenna.
In another embodiment of the present invention, a method for SNR measurement before and after multi-antenna receive forming is provided, which includes:
step 201': carrying out beam forming processing on the array antenna;
in the embodiment of the present invention, in the case that the array antenna receives the received signal, the received signal is shaped according to the last shaping factor, and further, after receiving the received signal, the weighting and combining are performed in advance through weighting and combining, where the shaping weighting factors adopt pre-stored shaping weighting factors w1, w2, and … wka, so that a main beam is formed on the useful signal.
In the embodiment of the invention, because the data required by the estimation of the optimal solution is noisy, the method of synchronization after weighting and combining is adopted, which is beneficial to improving the power of the useful signal.
Step 202': synchronizing signals after shaping and combining, extracting a preamble synchronization sequence of each antenna, obtaining a signal-to-noise ratio value of each antenna according to the preamble synchronization sequence and a local synchronization sequence, and calculating a total signal-to-noise ratio value before receiving beam shaping according to the obtained signal-to-noise ratio value of each antenna;
and carrying out shaping processing on the received signal, and obtaining a noise signal according to the shaped received signal and the local reference signal by adopting a vector subtraction method. Furthermore, vector subtraction is carried out on the shaped received signal and a local reference signal, and an obtained calculation result is used as a noise signal.
That is, the received signal is shaped according to the last shaping factor, the signals after shaping and combining are synchronized, after synchronization is determined, preamble synchronization sequences of respective antennas are extracted, and then SNR values SNR1, SNR 2.
In the embodiment of the invention, the method for calculating the signal-to-noise ratio before the received beam forming is as follows:
amp＝mean(rms(xka(k)))./rms(d(k)),,ka＝1,2,...KA
d(k)＝d(k)*amp
Noisema(k)＝xka(k)-d(k)
further obtaining the signal-to-noise ratio before receiving beam forming
In another embodiment of the present invention, the damaged antenna can be selected according to the obtained snr value of each antenna. And further, the signal-to-noise ratio value of each antenna is judged, and under the condition that the signal-to-noise ratio value of the antenna is smaller than the average signal-to-noise ratio value, the antenna is judged to be damaged and is not used any more subsequently. That is, according to the magnitude of the SNR, it is determined whether there is a case where the SNR is significantly lower than the average SNR, and if so, it indicates that the antenna is damaged and is not used any more subsequently.
For example: the SNR measurement results of the 4 antennas are average values of SNR _ meas ═ 3.985313.647613.164212.6080, -3.9853 significantly smaller than-3.985313.647613.164212.6080, respectively, and thus it is judged that the first antenna is damaged.
Step 203': extracting data segment preamble synchronous sequences of respective antennas, and calculating a total signal-to-noise ratio value after receiving beam forming according to the data segment preamble synchronous sequences;
in the embodiment of the invention, the method for calculating the signal-to-noise ratio after the received beam forming comprises the following steps:
Noise_bf(k)＝d(k)-y(k)
signal-to-noise ratio of after received beam forming is
Step 204': and calculating the forming gain according to the total signal-to-noise ratio value before the receiving wave beam forming and the total signal-to-noise ratio value after the receiving wave beam forming.
In the embodiment of the invention, the total signal-to-noise ratio value after the receiving wave beam shaping and the total signal-to-noise ratio value before the receiving wave beam shaping are subjected to subtraction operation, and the obtained calculation result is used as the shaping gain.
In this embodiment, the forming gain is snr _ BF-snr _ nobf, so as to improve the signal-to-noise ratio measurement before and after forming.
In another embodiment of the present invention, a method for SNR measurement before and after multi-antenna receive forming is provided, which includes:
step 201': carrying out beam forming processing on the array antenna;
in the embodiment of the present invention, in the case that the array antenna receives the received signal, the received signal is shaped according to the last shaping factor, and further, after receiving the received signal, the weighting and combining are performed in advance through weighting and combining, where the shaping weighting factors adopt pre-stored shaping weighting factors w1, w2, and … wka, so that a main beam is formed on the useful signal.
In the embodiment of the invention, because the data required by the estimation of the optimal solution is noisy, the method of synchronization after weighting and combining is adopted, which is beneficial to improving the power of the useful signal.
Step 202 ": synchronizing signals after shaping and combining, extracting a preamble synchronization sequence of each antenna, obtaining a signal-to-noise ratio value of each antenna according to the preamble synchronization sequence and a local synchronization sequence, and calculating a total signal-to-noise ratio value before receiving beam shaping according to the obtained signal-to-noise ratio value of each antenna;
and carrying out shaping processing on the received signal, and obtaining a noise signal according to the shaped received signal and the local reference signal by adopting a vector subtraction method. Furthermore, vector subtraction is carried out on the shaped received signal and a local reference signal, and an obtained calculation result is used as a noise signal.
That is, the received signal is shaped according to the last shaping factor, the signals after shaping and combining are synchronized, after synchronization is determined, preamble synchronization sequences of respective antennas are extracted, and then SNR values SNR1, SNR 2.
In the embodiment of the invention, the method for calculating the signal-to-noise ratio before the received beam forming is as follows:
amp＝mean(rms(xka(k)))./rms(d(k)),,ka＝1,2,...KA
d(k)＝d(k)*amp
Noisema(k)＝xka(k)-d(k)
and then toObtaining the signal-to-noise ratio before the received wave beam shaping
Step 203': extracting the data segment preamble synchronous sequence of each antenna, calculating the beam forming factor according to the data segment preamble synchronous sequence of each antenna, weighting and combining the received signals according to the beam forming factor to obtain a new signal-to-noise ratio value, and calculating the total signal-to-noise ratio value after the received beam forming according to the data segment preamble synchronous sequence.
In the embodiment of the invention, the method for calculating the signal-to-noise ratio after the received beam forming comprises the following steps:
Noise_bf(k)＝d(k)-y(k)
signal-to-noise ratio of after received beam forming is
According to a second aspect of the present invention, there is provided a SNR measuring apparatus before and after multi-antenna receive forming, comprising:
a forming module 401, configured to perform beam forming processing on the array antenna;
in the embodiment of the present invention, the shaping module 401 is configured to, in a case that a received signal is received by an array antenna, perform receive shaping on the received signal according to a last shaping factor, and further perform pre-shaping weighting and combining after the received signal is received, where the pre-stored shaping weighting factors w1, w2, and … wka are used as the shaping weighting factors, so that a main beam is formed on a useful signal.
In the embodiment of the invention, because the data required by the estimation of the optimal solution is noisy, the method of synchronization after weighting and combining is adopted, which is beneficial to improving the power of the useful signal.
A first signal-to-noise ratio value calculation module 402, configured to synchronize signals after beamforming combining, extract preamble synchronization sequences of respective antennas, obtain signal-to-noise ratio values of the respective antennas according to the preamble synchronization sequences and a local synchronization sequence, and calculate a total signal-to-noise ratio value before beamforming according to the obtained signal-to-noise ratio values of the respective antennas;
in the embodiment of the present invention, the first snr value calculating module 402 performs shaping processing on the received signal, and obtains a noise signal according to the shaped received signal and the local reference signal by using a vector subtraction method. Furthermore, vector subtraction is carried out on the shaped received signal and a local reference signal, and an obtained calculation result is used as a noise signal.
That is, the received signal is shaped according to the last shaping factor, the signals after shaping and combining are synchronized, after synchronization is determined, preamble synchronization sequences of respective antennas are extracted, and then SNR values SNR1, SNR 2.
In the embodiment of the invention, the method for calculating the signal-to-noise ratio before the received beam forming is as follows:
amp＝mean(rms(xka(k)))./rms(d(k)),,ka＝1,2,...KA
d(k)＝d(k)*amp
Noisema(k)＝xka(k)-d(k)
further obtaining the signal-to-noise ratio before receiving beam forming
In another embodiment of the invention, the device can also screen out damaged antennas according to the obtained signal-to-noise ratio value of each antenna. And further, the signal-to-noise ratio value of each antenna is judged, and under the condition that the signal-to-noise ratio value of the antenna is smaller than the average signal-to-noise ratio value, the antenna is judged to be damaged and is not used any more subsequently. That is, according to the magnitude of the SNR, it is determined whether there is a case where the SNR is significantly lower than the average SNR, and if so, it indicates that the antenna is damaged and is not used any more subsequently.
For example: the SNR measurement results of the 4 antennas are average values of SNR _ meas ═ 3.985313.647613.164212.6080, -3.9853 significantly smaller than-3.985313.647613.164212.6080, respectively, and thus it is judged that the first antenna is damaged.
The second snr value calculating module 403 is configured to extract a data segment preamble synchronization sequence of each antenna, and calculate a total snr value after receiving beamforming according to the data segment preamble synchronization sequence.
In the embodiment of the present invention, the method for calculating the snr after the second snr value calculation module 403 receives beamforming is as follows:
Noise_bf(k)＝d(k)-y(k)
signal-to-noise ratio of after received beam forming is
In another embodiment of the present invention, the apparatus further comprises: and calculating a beam forming factor according to the data segment preamble synchronous sequence of each antenna, and performing weighting combination on the received signals according to the beam forming factor to obtain a new signal-to-noise ratio value.
In another embodiment of the present invention, an SNR measuring apparatus before and after multi-antenna receive forming is provided, which includes:
a forming module 401' for performing beam forming processing on the array antenna;
in the embodiment of the present invention, the shaping module 401' is configured to, in a case that a received signal is received by an array antenna, perform receive shaping on the received signal according to a last shaping factor, and further perform pre-shaping weighting combination by weighting combination after the received signal is received, where the pre-stored shaping weighting factors w1, w2, and … wka are used as the shaping weighting factors, so that a main beam is formed on a useful signal.
In the embodiment of the invention, because the data required by the estimation of the optimal solution is noisy, the method of synchronization after weighting and combining is adopted, which is beneficial to improving the power of the useful signal.
A first signal-to-noise ratio value calculating module 402' for synchronizing the signals after forming and combining, extracting the preamble synchronization sequence of each antenna, obtaining the signal-to-noise ratio value of each antenna according to the preamble synchronization sequence and the local synchronization sequence, and calculating the total signal-to-noise ratio value before receiving beam forming according to the obtained signal-to-noise ratio value of each antenna;
in the embodiment of the present invention, the first snr value calculating module 402' performs shaping processing on the received signal, and obtains a noise signal according to the shaped received signal and the local reference signal by using a vector subtraction method. Furthermore, vector subtraction is carried out on the shaped received signal and a local reference signal, and an obtained calculation result is used as a noise signal.
That is, the received signal is shaped according to the last shaping factor, the signals after shaping and combining are synchronized, after synchronization is determined, preamble synchronization sequences of respective antennas are extracted, and then SNR values SNR1, SNR 2.
In the embodiment of the invention, the method for calculating the signal-to-noise ratio before the received beam forming is as follows:
amp＝mean(rms(xka(k)))./rms(d(k)),,ka＝1,2,...KA
d(k)＝d(k)*amp
Noisema(k)＝xka(k)-d(k)
further obtaining the signal-to-noise ratio before receiving beam forming
In another embodiment of the invention, the device can also screen out damaged antennas according to the obtained signal-to-noise ratio value of each antenna. And further, the signal-to-noise ratio value of each antenna is judged, and under the condition that the signal-to-noise ratio value of the antenna is smaller than the average signal-to-noise ratio value, the antenna is judged to be damaged and is not used any more subsequently. That is, according to the magnitude of the SNR, it is determined whether there is a case where the SNR is significantly lower than the average SNR, and if so, it indicates that the antenna is damaged and is not used any more subsequently.
For example: the SNR measurement results of the 4 antennas are average values of SNR _ meas ═ 3.985313.647613.164212.6080, -3.9853 significantly smaller than-3.985313.647613.164212.6080, respectively, and thus it is judged that the first antenna is damaged.
A second snr value calculating module 403' for extracting data segment preamble synchronization sequences of respective antennas, and calculating a total snr value after receiving beamforming according to the data segment preamble synchronization sequences;
in the embodiment of the invention, the method for calculating the signal-to-noise ratio after the received beam forming comprises the following steps:
Noise_bf(k)＝d(k)-y(k)
signal-to-noise ratio of after received beam forming is
In another embodiment of the present invention, the apparatus further includes a beamforming factor calculating unit configured to calculate a beamforming factor according to the preamble synchronization sequence of the data segment of each antenna, and perform weighting and combining on the received signals according to the beamforming factor to obtain a new snr value.
The gain module 204' is configured to calculate a forming gain according to the total snr value before the receive beamforming and the total snr value after the receive beamforming.
In the embodiment of the present invention, the gain module 204' is configured to perform a subtraction operation on the total snr value after the receive beamforming and the total snr value before the receive beamforming, and use an obtained calculation result as the beamforming gain.
In this embodiment, the forming gain is snr _ BF-snr _ nobf, so as to improve the signal-to-noise ratio measurement before and after forming.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be understood that the above detailed description of the technical solution of the present invention with the help of preferred embodiments is illustrative and not restrictive. On the basis of reading the description of the invention, a person skilled in the art can modify the technical solutions described in the embodiments, or make equivalent substitutions for some technical features; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A SNR measurement method before and after multi-antenna receive forming is characterized by comprising the following steps:
carrying out beam forming processing on the array antenna;
synchronizing signals after shaping and combining, extracting a preamble synchronization sequence of each antenna, obtaining a signal-to-noise ratio value of each antenna according to the preamble synchronization sequence and a local synchronization sequence, and calculating a total signal-to-noise ratio value before receiving beam shaping according to the obtained signal-to-noise ratio value of each antenna;
and extracting the data segment preamble synchronous sequence of each antenna, and calculating the total signal-to-noise ratio value after the received wave beam is shaped according to the data segment preamble synchronous sequence.
2. The method of claim 1,
the method further comprises the following steps: and screening out the damaged antenna according to the signal-to-noise ratio value of each antenna.
3. The method of claim 2,
the screening out the damaged antennas according to the signal-to-noise ratio values of the antennas comprises: and judging the signal-to-noise ratio value of each antenna, and judging that the antenna is damaged under the condition that the signal-to-noise ratio value of the antenna is smaller than the average signal-to-noise ratio value.
4. The method of claim 1,
the method further comprises the following steps: and calculating a beam forming factor according to the data segment preamble synchronous sequence of each antenna, and performing weighting combination on the received signals according to the beam forming factor to obtain a new signal-to-noise ratio value.
5. The method of claim 1,
the method further comprises the following steps: and calculating the forming gain according to the total signal-to-noise ratio value before the receiving wave beam forming and the total signal-to-noise ratio value after the receiving wave beam forming.
6. The method of claim 5,
the calculating the forming gain according to the total signal-to-noise ratio value before the receiving wave beam forming and the total signal-to-noise ratio value after the receiving wave beam forming comprises:
and subtracting the total signal-to-noise ratio value after the receiving wave beam shaping and the total signal-to-noise ratio value before the receiving wave beam shaping, and taking the obtained calculation result as shaping gain.
7. The method of claim 1,
the method for synchronizing signals after forming and combining, extracting preamble synchronization sequences of respective antennas, obtaining signal-to-noise ratio values of the respective antennas according to the preamble synchronization sequences and local synchronization sequences, and calculating a total signal-to-noise ratio value before receiving beam forming according to the obtained signal-to-noise ratio values of the respective antennas includes:
synchronizing the signals after shaping and combining, extracting a preamble synchronization sequence of each antenna after synchronization is determined, performing vector subtraction according to the received synchronization sequence and a local synchronization sequence to obtain the signal-to-noise ratio value of each antenna, and calculating the total signal-to-noise ratio value before receiving beam shaping according to the obtained signal-to-noise ratio value of each antenna.
8. An apparatus for measuring SNR before and after multi-antenna receive forming, comprising:
the shaping module is used for carrying out beam shaping processing on the array antenna;
the first signal-to-noise ratio value calculation module is used for synchronizing the signals after the forming combination, extracting the preamble synchronization sequence of each antenna, obtaining the signal-to-noise ratio value of each antenna according to the preamble synchronization sequence and the local synchronization sequence, and calculating the total signal-to-noise ratio value before the receiving wave beam forming according to the obtained signal-to-noise ratio value of each antenna;
and the second signal-to-noise ratio value calculation module is used for extracting the data segment preamble synchronous sequence of each antenna and calculating the total signal-to-noise ratio value after the received wave beam is shaped according to the data segment preamble synchronous sequence.
9. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor,
the processor, when executing the program, performs the steps of the method of any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a program which, when executed, is capable of implementing the method according to any one of claims 1-7.
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