CN115208492B - NR uplink control channel signal detection method - Google Patents

NR uplink control channel signal detection method Download PDF

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CN115208492B
CN115208492B CN202210824136.9A CN202210824136A CN115208492B CN 115208492 B CN115208492 B CN 115208492B CN 202210824136 A CN202210824136 A CN 202210824136A CN 115208492 B CN115208492 B CN 115208492B
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signal
data
control channel
uplink control
detection method
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CN115208492A (en
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刘卜瑞
吕磊
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Sichuan Innogence Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • 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]
    • 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
    • H04B17/345—Interference values
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The invention discloses a NR uplink control channel signal detection method, which comprises the following steps: s1, carrying out dephasing operation on received pilot frequency and data signals; s2, OOC is solved for the pilot frequency and the data signal after the dephasing; s3, windowing the pilot frequency and the data signal after OOC solution; s4, after zero padding is carried out on the windowed signal, a filtered pilot frequency time domain signal and a filtered data time domain signal are obtained through IFFT/IDFT operation; s5, extracting the peak value of the pilot signal and the peak value of the data signal of each code channel in the time domain, estimating the SNR, comparing the SNR with a preset value, demodulating the data higher than the preset value, and otherwise judging as DTX. Compared with the prior art, each OCC code group is sequentially transformed into the time domain after windowing, so that side lobes of the time domain waveform are restrained, namely, inter-user interference caused by the fact that orthogonality of frequency domain sequences is destroyed is restrained, and interference on multi-user multiplexing signals is obviously reduced.

Description

NR uplink control channel signal detection method
Technical Field
The invention relates to the technical field of communication, in particular to a NR uplink control channel signal detection method.
Background
The existing PUCCH (Physical Uplink Control CHannel physical uplink control channel) signal detection methods mainly include two methods: the first is to estimate the signal receiving power or signal-to-noise ratio by using the frequency domain signal, and then judge the state information by comparing the estimated value with the preset value. The method has the defect that the accuracy of estimating the signal power and the noise power by using the frequency domain signal is not high due to the inter-user interference in MU-MIMO (Multiple user/Multiple-input/Multiple-output multi-user multi-input multi-output technology), thereby influencing the detection performance. The second is to convert the channel response to the time domain by IFFT (Inverse Fast Fourier Transform inverse fast fourier transform) or IDFT (Inverse Discrete Fourier Transform inverse discrete fourier transform), and then perform state information judgment by calculating the signal-to-noise ratio by selecting a path and comparing with a preset value. The method has the defects that the user signal is leaked in the process of converting the domain, and the signal to noise ratio estimation is biased due to misjudgment of the interference path in the process of selecting the path, so that the detection performance is influenced. In addition to this, there are interference cancellation methods: and converting the channel response into a time domain, selecting a path with an energy value meeting a preset high-energy path selection condition as an enabling path, reconstructing and superposing the enabling path, and removing the enabling path from a received signal. The disadvantage of this method is that the problem of user signal leakage and the setting of high energy path selection conditions during the transform domain is not easy and does not describe how to perform state information detection.
None of the above methods effectively deal with inter-user interference at MU-MIMO.
Disclosure of Invention
In view of the above problems, the present invention provides a method for detecting an NR (New Radio) uplink control channel signal, which can suppress inter-user interference during MU-MIMO so as to accurately determine state information transmitted in a channel.
The invention adopts the following technical scheme: a NR uplink control channel signal detection method comprises the following steps:
s1, dephasing: to receive pilot signal
Figure GDA0004150429920000021
And data signal y k,l Corresponding base sequences r at initial cyclic shift are respectively point multiplied 0,k Is conjugated with:
Figure GDA0004150429920000022
Figure GDA0004150429920000023
wherein, represents conjugation; k represents a subcarrier index; l denotes an OFDM (Orthogonal Frequency Divisition Multiplexing orthogonal frequency division multiplexing) symbol index.
And obtaining a pilot signal and a data signal after conjugation with the base sequence.
S2, despreading: the pilot signal and the data signal conjugated with the base sequence are conjugated with the time domain orthogonal sequence
Figure GDA0004150429920000024
Conjugate complex multiplication:
Figure GDA0004150429920000025
/>
Figure GDA0004150429920000026
a set of user signals using the same OCC (Orthogonal Cover Code, orthogonal sequence code) is obtained, called a code group.
S3, windowing: the code groups are windowed in sequence:
Figure GDA0004150429920000027
Figure GDA0004150429920000028
where c (k) is a window function.
The side lobe suppression effect is achieved.
S4, after zero padding is carried out on the windowed code group, a filtered pilot frequency time domain signal and a filtered data time domain signal are obtained through inverse discrete Fourier transform operation;
Figure GDA0004150429920000031
Figure GDA0004150429920000032
s5, extracting pilot signal peak values and data signal peak values of all code channels in a time domain, and calculating signal-to-noise ratio SNR:
Figure GDA0004150429920000033
where S is the average of the peak power of the pilot signal and the data signal and N is the noise power.
SNR is compared to a preset value:
Figure GDA0004150429920000034
in which DTX is discontinuous transmission, SNR thr Is a preset value.
Preferably, the preset value SNR in the step S5 thr Simulation experience.
Preferably, in the step S5, one or more of a sine wave amplitude demodulation method, a sine wave angle demodulation method, and a resonance demodulation method is used for demodulation.
Preferably, the c (k) includes a window function having a sidelobe suppressing effect, such as hanning window, hamming window, kesain window, blackman window, gaussian window, triangular window, chebyshev window, and the like.
The beneficial effects of the invention are as follows: compared with the prior art, each OCC code group is sequentially transformed into the time domain after windowing, so that side lobes of the time domain waveform are restrained, namely, inter-user interference caused by the fact that orthogonality of frequency domain sequences is destroyed is restrained, and interference on multi-user multiplexing signals is obviously reduced.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following brief description of the drawings of the embodiments will make it apparent that the drawings in the following description relate only to some embodiments of the present invention and are not limiting of the present invention.
FIG. 1 is a schematic diagram of the steps of the present invention;
FIG. 2 is a diagram of a three-purpose windowed multiplexed time domain waveform according to an embodiment of the present invention;
fig. 3 is a diagram of a three-purpose windowed multiplexing time domain waveform according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.
Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of the terms "comprising" or "includes" and the like in this disclosure is intended to cover an element or article listed after that term and equivalents thereof without precluding other elements or articles. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
The invention will be further described with reference to the drawings and examples.
The frequency domain code channels 3,6 and 9 are multiplexed, and the time bias is respectively 0ns, 400ns and 800ns.
When the window is not added, the time domain waveform diagrams of the pilot frequency receiving signal and the data receiving signal are drawn, and as shown in fig. 2, the phases and the amplitudes of the main paths of the multi-user pilot frequency signal and the data signal can be seen to be interfered.
With the present invention, as shown in fig. 1, an NR uplink control channel signal detection method, includes the following steps:
s1, dephasing: to receive pilot signal
Figure GDA0004150429920000041
And data signal y k,l Corresponding base sequence r when initial cyclic shift m_0=0 is respectively point multiplied 0,k Is conjugated with:
Figure GDA0004150429920000051
Figure GDA0004150429920000052
wherein, represents conjugation; k represents a subcarrier index; l denotes the OFDM symbol index.
And obtaining a pilot signal and a data signal after conjugation with the base sequence.
S2, despreading: pilot signal after conjugation with base sequence
Figure GDA0004150429920000053
And data signal and time domain orthogonal sequence->
Figure GDA0004150429920000054
Conjugate complex multiplication:
Figure GDA0004150429920000055
Figure GDA0004150429920000056
a set of user signals using the same OCC is obtained, called a code group.
S3, windowing: the code groups are windowed in sequence:
Figure GDA0004150429920000057
Figure GDA0004150429920000058
where c (k) is a window function.
The side lobe suppression effect is achieved.
S4, after zero padding is carried out on the windowed code group, a filtered pilot frequency time domain signal and a filtered data time domain signal are obtained through inverse fast Fourier transform or inverse discrete Fourier transform operation;
Figure GDA0004150429920000059
Figure GDA00041504299200000510
s5, extracting the peak value of the pilot signal and the peak value of the data signal of each code channel in the time domain, and calculating the SNR:
Figure GDA00041504299200000511
where S is the average of the peak power of the pilot signal and the data signal and N is the noise power.
SNR is compared to a preset value:
Figure GDA0004150429920000061
in which DTX is discontinuous transmission, SNR thr Is a preset value.
The preset value SNR in the step S5 thr Simulation experience.
In the step S5, one or more of a sine wave amplitude demodulation mode, a sine wave angle demodulation mode and a resonance demodulation mode are adopted for demodulation.
And c (k) comprises window functions with side lobe suppression function, such as hanning windows, hamming windows, kesain windows, blackman windows, gaussian windows, triangular windows, chebyshev windows and the like, and the window functions are selected according to practical situations.
The time domain waveform diagrams after steps S1 to S5 of the invention are shown in FIG. 3, so that the time domain waveform side lobes of each user can be effectively restrained, and the interference of the multi-user multiplexing signal is obviously reduced.
The present invention is not limited to the preferred embodiments, but is not limited to the preferred embodiments, and the window function used for filtering is not limited to the window function used by the present invention, as the present invention can be modified or changed in some ways without departing from the scope of the present invention. However, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.

Claims (10)

1. The NR uplink control channel signal detection method is characterized by comprising the following steps:
s1, dephasing: respectively performing point multiplication on the received pilot frequency and data signals by the conjugate of the corresponding base sequence in the initial cyclic shift to obtain a pilot frequency signal and a data signal after the conjugation of the base sequence;
s2, despreading: the pilot signal and the data signal conjugated with the base sequence are conjugated and multiplied with the time domain orthogonal sequence to obtain a set of user signals using the same OCC code, which is called a code group;
s3, windowing: windowing the code groups in sequence;
s4, after zero padding is carried out on the windowed code group, a filtered pilot frequency time domain signal and a filtered data time domain signal are obtained through inverse fast Fourier transform or inverse discrete Fourier transform operation;
s5, extracting pilot signal peak values and data signal peak values of all code channels in a time domain, calculating a signal-to-noise ratio, comparing the signal-to-noise ratio with a preset value, demodulating data higher than the preset value, and otherwise judging that the data is transmitted discontinuously.
2. The NR uplink control channel signal detection method according to claim 1, wherein in the step S1: pilot signal to be received
Figure QLYQS_1
And data signal y k,l Base sequence r with frequency domain code number 0 0,k Conjugate point multiplication performs a dephasing operation:
Figure QLYQS_2
Figure QLYQS_3
wherein, represents conjugation; k represents a subcarrier index; l denotes the OFDM symbol index.
3. The NR uplink control channel signal detection method according to claim 2, wherein in the step S2: the data signal and the pilot signal after the dephasing in the step S1 are combined with an OCC sequence with index j
Figure QLYQS_4
Conjugate multiplication results in a pilot and data signal after OCC solution:
Figure QLYQS_5
Figure QLYQS_6
。
4. the NR uplink control channel signal detection method according to claim 3, wherein the step S3 specifically comprises: windowing the pilot and data signals after OCC solution:
Figure QLYQS_7
Figure QLYQS_8
where c (k) is a window function.
5. The NR uplink control channel signal detection method according to claim 4, wherein the step S4 specifically comprises: zero padding is carried out on the filtered data to M points, M is more than 12, inverse discrete Fourier transform operation is carried out, and time domain signals of pilot frequency and data are obtained:
Figure QLYQS_9
Figure QLYQS_10
。
6. the NR uplink control channel signal detection method according to claim 1, wherein the signal-to-noise ratio calculation formula in step S5:
Figure QLYQS_11
where SNR is the signal-to-noise ratio, S is the average of the peak powers of the pilot and data signals, and N is the noise power.
7. The NR uplink control channel signal detection method according to claim 1, wherein the signal-to-noise ratio in step S5 is compared with a preset value:
Figure QLYQS_12
in the formula, DTX is discontinuous transmission, SNR is signal to noise ratio, SNR thr Is a preset value.
8. The NR uplink control channel signal detection method according to claim 7, wherein the preset value SNR in step S5 thr Through simulation experience.
9. The NR uplink control channel signal detection method according to claim 1, wherein the demodulation in step S5 is one or more of a sine wave amplitude demodulation scheme, a sine wave angle demodulation scheme, and a resonance demodulation scheme.
10. The NR uplink control channel signal detection method of claim 4 wherein the window function c (k) comprises a hanning window, a hamming window, a kesse window, a blackman window, a gaussian window, a triangular window, a chebyshev window.
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