CN114268352B - Detection method of NR uplink control channel format 1 - Google Patents
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Abstract
The invention discloses a detection method of an NR uplink control channel format 1, which comprises the steps of receiving data by a base station, extracting and splitting the data, operating by using a frequency domain and time domain local spread spectrum sequence of an idle code channel and a target signal to obtain an interference noise power measured value, a channel estimation value and a data signal, and respectively splicing according to operation data of different frequency hopping RB positions of different antennas according to a given sequence R to obtain a corresponding data vector, a channel estimation vector and an interference noise matrix; inputting the data vector, the channel estimation vector and the interference noise matrix into a minimum mean square error equalizer to obtain equalized data; and mapping the equalization data to a standard constellation point according to a given decision rule, and demodulating the equalization data into information bits according to a given bit-constellation point mapping rule. The invention splices different frequency hopping RB positions and different antenna signals and sends the signals to the MMSE equalizer at one time, thereby effectively overcoming the performance loss caused by larger difference of signal-to-noise ratio conditions among multiple paths of signals.
Description
Technical Field
The invention relates to the field of mobile communication, in particular to a detection method of an NR uplink control channel format 1.
Background
In an NR (new air interface, i.e., fifth generation mobile communication technology) system, a base station receives a PUCCH (physical uplink control channel) format 1 signal using a plurality of antennas and different RB (frequency domain resource block, 1RB contains 12 OFDM subcarriers) positions. In a complex wireless propagation environment, the difference of the signal-to-noise ratio conditions of the multi-channel signals is large, the prior art directly carries out linear averaging on the multi-channel signals, and obvious performance loss is caused in a scene with large difference of the signal-to-noise ratio conditions of different RB and different antenna signals.
The patent CN105873120A provides a scheme for screening different antenna signals through a signal-to-noise ratio threshold, which can significantly improve the performance of a distributed antenna scene, but in a scene with a small difference between the signal-to-noise ratio conditions of different antennas, too many useful signals are lost, and there is an obvious performance loss. The patent CN107453850A provides an interference scenario enhancement scheme, which includes measuring the signal-to-noise ratios of different antenna signals, calculating a weight coefficient between 0 and 1, and then performing weighting combination on the different antenna signals, so as to improve the system performance of the interference scenario.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a detection method of an NR uplink control channel format 1, which can effectively improve the detection performance of a system.
The purpose of the invention is realized by the following technical scheme:
a detection method of NR uplink control channel format 1 mainly comprises the following steps:
the method comprises the following steps: the base station extracts and splits the received data, extracts corresponding received signals according to the time-frequency resource position of a target user, and splits the received signals into 4 paths of signals according to different antennas and different frequency hopping RB position dimensions;
step two: measuring interference noise power, namely performing conjugate multiplication accumulation operation on a frequency domain and time domain local spread spectrum sequences of idle code channels and a target signal by a base station, and converting an operation result into interference noise power measurement values on single data code channels at different antennae and different frequency hopping RB positions;
step three: channel estimation, wherein a base station performs conjugate multiplication accumulation operation on a frequency domain pilot frequency local spread spectrum sequence and a time domain pilot frequency local spread spectrum sequence of a target user and a target signal to obtain channel estimation values of different antennas and different frequency hopping RB positions;
step four: extracting data signals, wherein a base station performs conjugate multiplication accumulation operation on a frequency domain data local spreading sequence and a time domain data local spreading sequence of a target user and the target signals to obtain data signals of different antennas and different frequency hopping RB positions;
step five: data splicing, namely respectively splicing according to data signals, channel estimation values and interference noise power measurement values of different frequency hopping RB positions of different antennas according to a given sequence R to obtain corresponding data vectors, channel estimation vectors and interference noise matrixes;
step six; signal detection, inputting a data vector, a channel estimation vector and an interference noise matrix into a Minimum Mean Square Error (MMSE) equalizer to obtain equalized data;
step seven: and (3) constellation point judgment and demodulation, namely mapping the equalization data to a standard constellation point according to a given judgment rule, and demodulating the equalization data into information bits according to a given bit-constellation point mapping rule.
Specifically, the step one specifically comprises the following steps:
extracting received data in the current time slot of the base station: the base station extracts corresponding receiving signals according to the time-frequency resource position of the target user, wherein the receiving signals comprise data of 2 antennas, 2 frequency hopping RB positions and 7 time domain symbols of 12 subcarriers in each RB position.
Splitting different antenna data: 2 antenna receiving signals are divided into 2 paths of signals, namely data received by an antenna 0 and signals received by an antenna 1, each path of signals comprises 2 frequency hopping RB positions, and data of 7 time domain symbols of 12 subcarriers are contained in each RB position.
Further splitting the received signal into 4 paths of signals according to different frequency hopping RB positions, namely an antenna 0 frequency hopping RB 0 signal, an antenna 0 frequency hopping RB 1 signal, an antenna 1 frequency hopping RB 0 signal and an antenna 1 frequency hopping RB 1 signal, wherein each path of signals comprises data of 12 subcarriers and 7 time domain symbols; these 4 data paths are respectively expressed as:
wherein
Respectively representing a path of symbols, subcarriers and time domain symbol indexes.
Specifically, the second step specifically includes: the 4 paths of signals are respectively subjected to conjugate multiplication accumulation operation with the local spread spectrum sequences of the corresponding idle code channels, and the noise on the code channels is obtained as follows:
where L is the local spreading sequence length,
representing the jth noiseTime-frequency spread spectrum sequence of the sound code channel; then, the average noise power of each code channel is calculated as:
where Ln represents the total number of noise channels.
Specifically, the third step specifically comprises: extracting the corresponding part of the pilot frequency symbol from the 4 paths of signals, and respectively carrying out conjugate multiplication accumulation operation with the target user pilot frequency local spread spectrum sequence to obtain 4 paths of channel estimation values, wherein the operation process is shown as the following formula:
wherein
Indicating the pilot portion in the ith data,
indicating the pilot spreading sequence length of the ith path of data.
Specifically, the fourth step specifically includes: extracting the corresponding part of the data symbol from the 4 paths of signals, and respectively carrying out conjugate multiplication accumulation operation with the target user data local spread spectrum sequence to obtain 4 paths of despread data signals, wherein the process is shown as the following formula:
wherein
Indicating the data portion in the ith way of data,
and the length of the data spreading sequence of the ith path of data is shown.
Specifically, the step five specifically comprises:
splicing data signals, namely splicing the data signals of different antenna different frequency hopping RB positions into data vectors according to a given sequence RS；
Channel splicing, namely splicing channel estimation values of different frequency hopping RB positions of different antennas into channel estimation vectors according to a given sequence R;
and (3) splicing interference noise, namely splicing the interference noise power measurement values of different antenna frequency hopping RB positions into interference noise vectors according to a given sequence R, and replacing diagonal elements of the all-zero matrix with the interference noise vectors to form an interference noise matrix N.
The invention has the beneficial effects that:
compared with the prior scheme, the invention has obvious gain in the scene with larger difference of signal-to-noise ratio conditions of different frequency hopping RB positions and different antenna signals: the MMSE equalizer adaptively adjusts the corresponding scaling weight according to the signal-to-noise ratio conditions of different paths of signals, so that different frequency hopping RB positions and different antenna signals are spliced and then sent to the MMSE equalizer at one time, and the performance loss caused by large difference of the signal-to-noise ratio conditions among multiple paths of signals can be effectively overcome.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a flow chart of a technical implementation of the present invention;
fig. 3 is a flowchart of a technique according to a first embodiment of the present invention.
Detailed Description
The following detailed description will be selected to more clearly understand the technical features, objects and advantages of the present invention. It should be understood that the embodiments described are illustrative of some, but not all embodiments of the invention, and should not be taken to limit the scope of the invention. All other embodiments that can be obtained by a person skilled in the art based on the embodiments of the present invention without any inventive step are within the scope of the present invention.
In the present invention, as shown in fig. 1 and fig. 2, a method for detecting an NR uplink control channel format 1 mainly includes the following steps:
the method comprises the following steps: the base station extracts and splits received data, extracts corresponding received signals according to the time-frequency resource position of a target user, and splits the received signals into 4 paths of signals according to different antennas and different frequency hopping RB position dimensions;
step two: measuring interference noise power, namely performing conjugate multiplication accumulation operation on a frequency domain and time domain local spread spectrum sequences of idle code channels and a target signal by using a base station, and converting an operation result into interference noise power measurement values on single data code channels of different antennas and different frequency hopping RB positions;
step three: channel estimation, wherein a base station performs conjugate multiplication accumulation operation on a frequency domain pilot frequency local spread spectrum sequence and a time domain pilot frequency local spread spectrum sequence of a target user and a target signal to obtain channel estimation values of different antennas and different frequency hopping RB positions;
step four: extracting data signals, wherein a base station performs conjugate multiplication accumulation operation on a frequency domain data local spreading sequence and a time domain data local spreading sequence of a target user and the target signals to obtain data signals of different antennas and different frequency hopping RB positions;
step five: data splicing, namely respectively splicing according to data signals, channel estimation values and interference noise power measurement values of different frequency hopping RB positions of different antennas according to a given sequence R to obtain corresponding data vectors, channel estimation vectors and interference noise matrixes;
step six; signal detection, inputting a data vector, a channel estimation vector and an interference noise matrix into a Minimum Mean Square Error (MMSE) equalizer to obtain equalized data;
step seven: and (3) constellation point judgment and demodulation, namely mapping the equalization data to a standard constellation point according to a given judgment rule, and demodulating the equalization data into information bits according to a given bit-constellation point mapping rule.
The first embodiment is as follows:
in this embodiment, fig. 3 is a flowchart of an implementation of a first embodiment of the present invention, in which it is assumed that the number of base station receive antennas is 2, and a PUCCH format 1 signal is transmitted by frequency hopping (2 frequency hopping RB positions). The embodiment mainly comprises the following steps:
step 1, extracting received data in the current time slot of the base station: the base station extracts corresponding receiving signals according to the time-frequency resource position of a target user, wherein the receiving signals comprise data of 7 time-domain symbols of 12 subcarriers at 2 antennae and 2 frequency hopping RB positions;
step 2, splitting data of different antennas: splitting 2 antenna receiving signals into 2 paths of signals, namely receiving data by an antenna 0 and receiving signals by an antenna 1, wherein each path of signals comprises 2 frequency hopping RB positions, and each RB position comprises 12 subcarriers of data of 7 time domain symbols;
and step 3, further splitting the received signal into 4 paths of signals according to different frequency hopping RB positions, namely an antenna 0 frequency hopping RB 0 signal, an antenna 0 frequency hopping RB 1 signal, an antenna 1 frequency hopping RB 0 signal and an antenna 1 frequency hopping RB 1 signal, wherein each path of signals comprises data of 12 subcarriers and 7 time domain symbols. These 4 data paths are respectively expressed as:
wherein
Respectively representing a certain path of symbol, a subcarrier and a time domain symbol index;
step 4, the 4 paths of signals are respectively subjected to conjugate multiplication accumulation operation with the local spread spectrum sequences corresponding to the idle code channels to obtain the noise on the code channels:
where L is the local spreading sequence length,
and the time-frequency spreading sequence of the jth noise code channel is represented. The average noise power per code channel is then calculated:
wherein Ln represents the total number of noise code channels;
step 5, the parts corresponding to the extracted pilot symbols in the 4 channels of signals are respectively subjected to conjugate multiplication accumulation operation with a target user pilot local spread spectrum sequence to obtain 4 channels of channel estimation values, and the process is shown as the following formula:
wherein
Indicating the pilot portion in the ith data,
indicating the length of a pilot frequency spreading sequence of ith path data;
step 6, the parts corresponding to the extracted data symbols in the 4 paths of signals are respectively subjected to conjugate multiplication accumulation operation with the target user data local spread spectrum sequence to obtain 4 paths of despread data signals, and the process is shown as the following formula:
wherein
Indicating the data portion in the ith way of data,
the data spreading sequence length of the ith path of data is represented;
step 7, the 4 paths of noise power are spliced to obtain a noise matrixN：
Step 8, the 4 channel estimation values are spliced to obtain a channel estimation vector:
step 9, splicing the 4 paths of despread data signals to obtain despread data vectorsS：
Step 10, obtaining the equalized signal by MMSE equalizer
：
Step 11, mixing
And judging the nearest QPSK constellation point, and demodulating the QPSK constellation point into information bits according to a bit constellation mapping rule.
Compared with the prior scheme, the invention has obvious gain in different frequency hopping RB positions and different antenna signal-to-noise ratio conditions with larger difference: the MMSE equalizer adaptively adjusts the corresponding scaling weight according to the signal-to-noise ratio conditions of different paths of signals, so that different frequency hopping RB positions and different antenna signals are spliced and then sent to the MMSE equalizer at one time, and the performance loss caused by large difference of the signal-to-noise ratio conditions among multiple paths of signals can be effectively overcome.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A method for detecting NR uplink control channel format 1, comprising:
the method comprises the following steps: the base station extracts and splits received data, extracts corresponding received signals according to the time-frequency resource position of a target user, and splits the received signals into 4 paths of signals according to different antennas and different frequency hopping RB position dimensions;
step two: measuring interference noise power, namely performing conjugate multiplication accumulation operation on a frequency domain and time domain local spread spectrum sequences of idle code channels and a target signal by using a base station, and converting an operation result into interference noise power measurement values on single data code channels of different antennas and different frequency hopping RB positions;
the second step specifically comprises: the 4 paths of signals are respectively subjected to conjugate multiplication accumulation operation with the local spread spectrum sequences of the corresponding idle code channels, and the noise on the code channels is obtained as follows:
wherein L is the length of the local spreading sequence,
representing the time-frequency spread spectrum sequence of the jth noise code channel; then, the average noise power of each code channel is calculated as:
wherein Ln represents the total number of noise code channels; i, k and l respectively represent a certain path of symbol, subcarrier and time domain symbol index;
step three: channel estimation, wherein a base station performs conjugate multiplication accumulation operation on a frequency domain pilot frequency local spread spectrum sequence and a time domain pilot frequency local spread spectrum sequence of a target user and a target signal to obtain channel estimation values of different antennas and different frequency hopping RB positions;
step four: extracting data signals, wherein a base station performs conjugate multiplication accumulation operation on a frequency domain data local spreading sequence and a time domain data local spreading sequence of a target user and the target signals to obtain data signals of different antennas and different frequency hopping RB positions;
step five: data splicing, namely respectively splicing according to data signals, channel estimation values and interference noise power measurement values of different frequency hopping RB positions of different antennas according to a given sequence R to obtain corresponding data vectors, channel estimation vectors and interference noise matrixes;
step six; signal detection, inputting a data vector, a channel estimation vector and an interference noise matrix into a minimum mean square error equalizer to obtain equalized data;
step seven: and (3) constellation point judgment and demodulation, namely mapping the equalization data to a standard constellation point according to a given judgment rule, and demodulating the equalization data into information bits according to a given bit-constellation point mapping rule.
2. The method of claim 1, wherein the step one specifically comprises the steps of:
extracting received data in the current time slot of the base station: the base station extracts corresponding receiving signals according to the time-frequency resource position of a target user, wherein the receiving signals comprise data of 7 time-domain symbols of 12 subcarriers at 2 antennae and 2 frequency hopping RB positions;
splitting data of different antennas: splitting 2 antenna receiving signals into 2 paths of signals, namely receiving data by an antenna 0 and receiving signals by an antenna 1, wherein each path of signals comprises 2 frequency hopping RB positions, and each RB position comprises 12 subcarriers of data of 7 time domain symbols;
further splitting the received signal into 4 paths of signals according to different frequency hopping RB positions, namely an antenna 0 frequency hopping RB 0 signal, an antenna 0 frequency hopping RB 1 signal, an antenna 1 frequency hopping RB 0 signal and an antenna 1 frequency hopping RB 1 signal, wherein each path of signals comprises data of 12 subcarriers and 7 time domain symbols; the 4 paths of data are respectively expressed as
Wherein
Respectively representing a path of symbols, subcarriers and time domain symbol indexes.
3. The method for detecting NR uplink control channel format 1 according to claim 1, wherein the third step specifically includes: extracting the corresponding part of the pilot frequency symbol from the 4 paths of signals, and respectively carrying out conjugate multiplication accumulation operation with the target user pilot frequency local spread spectrum sequence to obtain 4 paths of channel estimation values, wherein the operation process is shown as the following formula:
wherein
Indicating the pilot portion in the ith data,
indicating the length of a pilot frequency spreading sequence of ith path data; i, k, l respectively represent a path of symbol, subcarrier and time domain symbol index.
4. The method for detecting format 1 of an NR uplink control channel according to claim 1, wherein the fourth step specifically includes: extracting the corresponding part of the data symbol from the 4 paths of signals, and respectively carrying out conjugate multiplication accumulation operation with the target user data local spread spectrum sequence to obtain 4 paths of despread data signals, wherein the process is shown as the following formula:
wherein
Indicating the data portion in the ith way of data,
the data spreading sequence length of the ith path of data is represented; i, k, l respectively represent a path of symbol, subcarrier and time domain symbol index.
5. The method for detecting format 1 of an NR uplink control channel according to claim 1, wherein the step five specifically includes:
splicing data signals, namely splicing the data signals of different antenna different frequency hopping RB positions into data vectors according to a given sequence RS；
Channel splicing, namely splicing channel estimation values of different frequency hopping RB positions of different antennas into channel estimation vectors according to a given sequence R;
and (3) splicing interference noise, namely splicing the interference noise power measurement values of different antenna frequency hopping RB positions into interference noise vectors according to a given sequence R, and replacing diagonal elements of the all-zero matrix with the interference noise vectors to form an interference noise matrix N.
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