Signal merging method, device and storage medium

Abstract

The present invention discloses a signal merging method, device and storage medium, including: obtaining a threshold value TH1 and a correlation sequence of a receiving antenna; merging each correlation sequence, and calculating the peak-to-average ratio of the merged correlation sequence; if the peak-to-average ratio of the merged correlation sequence is not within the upper interval of the threshold value TH1, the merged correlation sequence is directly output as the signal merging result, otherwise the detection window under the antenna correlation sequence is searched to obtain a series of peak values ​​and peak indexes, the maximum peak value and the maximum peak index are recorded based on the threshold value TH2, for each detection window that records the maximum peak value and the maximum peak index, the maximum peak index is subtracted from other peak indexes to obtain a difference set; based on the threshold value TH3 and each difference, the correlation sequence corresponding to the difference is updated; the updated correlation sequences of each current receiving antenna are merged and output. The present invention can effectively improve the user detection probability in this scenario, and accurately improve the user detection scenario under low signal-to-noise ratio.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technologies, and in particular to a signal merging method, device and storage medium, which are applied to a scenario in which the probability of signal detection is improved based on signal merging. Background Art

[0002] The main idea of ​​OFDM technology is to divide the original channel into several orthogonal sub-channels, convert the high-speed data signal into parallel low-speed sub-data streams, and modulate them to be transmitted on each sub-channel. The orthogonal signals formed in this way can be separated by using correlation technology at the receiving end, which can reduce the mutual interference between sub-channels. The signal bandwidth on each sub-channel is smaller than its sub-channel bandwidth, so the signal waveform on each sub-channel can be regarded as flat fading, thereby eliminating inter-symbol interference. Moreover, since the signal bandwidth on each sub-channel is only a small part of the original channel bandwidth, channel equalization becomes relatively easy. Therefore, in wireless communication systems, OFDM is one of the key technologies, which can be combined with diversity, space-time coding, interference and inter-channel interference suppression, and smart antenna technology to maximize system performance.

[0003] With the continuous evolution of wireless communication systems, wireless communication systems will provide more and more data and more reliable communication service quality (QoS) guarantees. At the same time, the environment of user terminals (UE) will become more and more complex with the advancement of modern technology. High-speed movement and various multipath reflection conditions determine that wireless communication systems must be able to adapt to these harsh transmission environments.

[0004] Fading and noise in the channel will cause the actual delay of each receiving antenna to be significantly affected by multipath and noise interference. In order to improve the detection probability of the signal, it is necessary to combine the signals according to their quality before combining. In the existing OFDM system, it is not feasible for random access signals to rely on the signal-to-noise ratio to achieve maximum ratio combining (MRC) of multi-antenna data in low signal-to-noise ratio scenarios, because random access signals cannot obtain signal-to-noise ratio information in low signal-to-noise ratio scenarios. In this way, when the channel quality is poor, the detection performance of the signal will be quite poor, which is quite unfavorable for UE access.

[0005] Patent CN101986572B provides a method for combining antennas by calculating the weights of each antenna based on the mean of the correlation sequence of each antenna. This method can effectively improve the signal quality after the antennas are combined in a scenario where the signal quality of each antenna is significantly different, but it has no effect on signal leakage caused by multipath delay of each antenna. Summary of the invention

[0006] The present invention provides a signal merging method, device and storage medium, which can effectively solve the above-mentioned problem.

[0007] In order to alleviate the above-mentioned problems, the technical solution adopted by the present invention is as follows:

[0008] In a first aspect, the present invention provides a signal merging method, comprising the following steps:

[0009] S1, obtaining the upper interval range of the threshold value TH1 and the correlation sequence of each receiving antenna;

[0010] S2. Combining the correlation sequences of the receiving antennas to obtain a combined correlation sequence, and calculating the peak-to-average ratio of the combined correlation sequence;

[0011] S3, if the peak-to-average ratio of the combined correlation sequence is not within the upper interval of the threshold value TH1, the combined correlation sequence is directly output as the signal combination result, otherwise continue to execute step S4;

[0012] S4, searching each detection window under the correlation sequence of each receiving antenna to obtain the peak value and peak index of the detection window;

[0013] S5. For each detection window under the correlation sequence of each receiving antenna, find its maximum peak value. If the maximum peak value is greater than the threshold value TH2, record the maximum peak value and the maximum peak index.

[0014] S6. For each detection window that records the maximum peak value and the maximum peak index under the correlation sequence of each receiving antenna, subtract the other peak indexes of the detection window except the maximum peak index from the maximum peak index to obtain a difference value set idx;

[0015] S7. For each difference in each difference set idx, if its absolute value is not less than the threshold value TH3, the correlation sequence corresponding to the difference is not updated; otherwise, the correlation sequence corresponding to the difference is updated based on the difference;

[0016] S8. Combine the correlation sequences of the current receiving antennas and output them as a signal combination result.

[0017] The technical effect of this technical solution is: by introducing the decision thresholds TH1 and TH2, the user detection scenario under low signal-to-noise ratio is accurately improved to avoid the waste of resources caused by indiscriminate detection; the user missed detection scenario caused by the relative delay between antennas is screened out through the decision threshold TH3, and the antenna related sequence is updated according to the peak index difference of the detection windows corresponding to different antennas, thereby aligning the relative delay of the detection windows between different antennas, and on this basis, combining the energy of each detection window between antennas, which can effectively improve the user detection probability in this scenario.

[0018] In a preferred embodiment of the present invention, the upper interval range of the threshold value TH1 is (a, b), wherein a is the lower limit of the peak-to-average ratio threshold, and b is the upper limit of the peak-to-average ratio threshold, both of which are obtained by simulating the peak-to-average ratio threshold of a low signal-to-noise ratio user missed detection scenario under a multipath channel; the threshold value TH2 is the single antenna user detection threshold, and the threshold value TH3 is obtained based on the maximum delay difference between multipaths.

[0019] The technical effect of this technical solution is: the detection window in which the peak value has a relative shift caused by the different time delays of different antennas is screened out through the decision threshold TH3.

[0020] In a preferred embodiment of the present invention, the correlation sequence of the receiving antenna is calculated according to the following calculation formula:

[0021]

[0022] Where P(τ) represents the correlation sequence of the receiving antenna, y(n) represents the received signal, x(n) represents the local sequence, N is the sequence length of y(n) and x(n), n is the index number of the signal point in y(n) and x(n), τ is the shift value, and * represents conjugation.

[0023] The technical effect of this technical solution is: it is easy to screen out qualified detection windows through the decision threshold TH2.

[0024] In a preferred embodiment of the present invention, in step S5, for each detection window under the correlation sequence of each receiving antenna, all its peak values ​​need to be sorted in descending order.

[0025] The technical effect of this technical solution is: sorting the peak values ​​of the detection window to facilitate direct finding of the maximum peak value and performing difference calculation.

[0026] In a preferred embodiment of the present invention, in step S5, for several detection windows under the correlation sequence of each receiving antenna, if the maximum peak value of one detection window is not greater than the threshold value TH2, continue to traverse the next detection window until all detection windows are traversed.

[0027] The technical effect of this technical solution is: TH2 is used to further determine whether there is a user signal in the detection window with the best signal quality. If so, subsequent steps are performed to avoid an increase in the probability of false detection of users due to noise.

[0028] In a preferred embodiment of the present invention, in step S6, for a difference whose absolute value is less than the threshold value TH3, if it is greater than 0, the corresponding correlation sequence is updated by cyclically shifting the difference to the right; if it is not greater than 0, the corresponding correlation sequence is updated by cyclically shifting the difference to the left.

[0029] The technical effect of this technical solution is: by aligning the peak energies of the corresponding detection windows between antennas according to the difference, the peak energy of the combined detection window can be enhanced, thereby improving the user detection probability.

[0030] In a second aspect, the present invention provides an electronic device, comprising:

[0031] at least one processor, and a memory in communication with the processor;

[0032] The memory stores instructions, and the instructions are executed by the processor so that the processor implements the method described in the first aspect when executing the instructions.

[0033] The technical effect of this technical solution is: through this electronic device, the signal merging method mentioned in the first aspect can be implemented.

[0034] In a third aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to execute the method described in the first aspect.

[0035] The technical effect of this technical solution is: this medium stores program instructions corresponding to the method described in the first aspect, and can be used in conjunction with other communication devices to implement the signal merging method described in the first aspect.

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the embodiments of the present invention are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 1 is a schematic diagram of the overall flow of the signal merging method described in the embodiment;

[0039] Figure 2 is a schematic diagram of a process for obtaining initial data in an embodiment;

[0040] Figure 3 is a schematic diagram of a process of antenna merging pre-determination in an embodiment;

[0041] Figure 4 is a schematic diagram of the antenna merging process in an embodiment;

[0042] Figure 5 is a receiving antenna related sequence diagram in an embodiment;

[0043] Figure 6 is a related sequence diagram after receiving antennas are combined in the embodiment;

[0044] Figure 7 is an example diagram of a detection window of a receiving antenna in an embodiment;

[0045] Figure 8 is a correlation sequence diagram after the detection window 2 of the receiving antenna 1 is updated in the embodiment. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0049] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Example

[0051] Please refer to Figure 1 to Figure 4 , an embodiment of the present invention provides a signal merging method, which is as follows:

[0052] (1) Assuming there are 4 receiving antennas, set the threshold values ​​TH1 = (5.5122, 8.6072), TH2 = 565.29, and TH3 = 15.

[0053] In this embodiment, the threshold value is obtained through a large number of simulations, and the upper interval range of the threshold value TH1 is (a, b). The threshold ensures that both the poorer and better signals that need to be updated do not need to go through this signal merging process. The threshold value TH1 is obtained by simulating the peak-to-average ratio threshold of the low signal-to-noise ratio user missed detection scenario under the multipath channel; the threshold value TH2 is the single antenna user detection threshold, and the threshold value TH3 is obtained according to the maximum delay difference between the multipaths.

[0054] (2) Obtain the correlation sequences corresponding to the four receiving antennas under the current configuration information and record them as P1(k), P2(k), P3(k), and P4(k), see Figure 5 As shown in the figure, the x-axis represents the index of the correlation sequence, and the y-axis represents the correlation value corresponding to the index. The peak value and peak index of the correlation sequence of each receiving antenna are marked in the figure. The correlation sequence corresponding to each receiving antenna is combined, and the combined correlation sequence is recorded as P(k). Figure 6 As shown, the corresponding peak-to-average ratio tempTh1 n It is 5.9291.

[0055] (3) If tempTh1 n In the interval [a, b], the peak value peakPower and the peak index peakPowerIdx corresponding to each detection window under the correlation sequence of each receiving antenna are further searched and recorded.

[0056] The maximum peak value and peak index corresponding to the mth detection window of receiving antenna n are recorded as PeakPower n (m),PeakPowerIdx n (m), where the schematic diagram of the relevant sequence detection window is shown in Figure 7 shown.

[0057] In this embodiment, the present solution is described in detail by taking detection window 2 as an example. The peak index and peak value corresponding to the detection window 2 of each receiving antenna correlation sequence are (335, 623.38), (331, 372.82), (339, 1232.7), (337, 325.32), respectively, which are recorded as (PeakPower1(2), PeakPowerIdx1(2)), (PeakPower2(2), PeakPowerIdx2(2)), (PeakPower3(2), PeakPowerIdx3(2)), (PeakPower4(2), PeakPowerIdx4(2)).

[0058] (4) Perform the following operations on each detection window in turn, taking detection window 2 as an example:

[0059] A. Set the peak power of the second detection window of the four receiving antennas n (2) Sort the peak values ​​from large to small as follows: (PeakPower3(2), PeakPowerIdx3(2)), (PeakPower1(2), PeakPowerIdx1(2)), (PeakPower2(2), PeakPowerIdx2(2)), (PeakPower4(2), PeakPowerIdx4(2)), and record the peak index and peak value (339, 1232.7) corresponding to the detection window 2 of the receiving antenna 3 corresponding to the maximum peak. The maximum peak value 1232.7 among the peak values ​​of each detection window is greater than the threshold value TH2, that is, greater than 565.29. Then, the peak value 1232.7 is marked as maxPeakPower(m) and the peak index 339 is marked as maxPeakPowerIdx(2). Then, continue to execute step B. If the maximum peak value 1232.7 among the peak values ​​of each detection window is less than TH2, continue to traverse the detection window 3 until the maximum peak value judgment of all detection windows is completed.

[0060] B. Get the peak index PeakPowerIdx of the second detection window of receiving antennas 1, 2, and 4 n (2) Subtract the value from maxPeakPowerIdx(2) and record it as the difference set idx={idx 1,3 , idx 2,3 , idx 4,3}={4,8,2}, where idx 1,3 ,idx 2,3 ,idx 4,3 They respectively represent the differences between the peak indexes of detection window 2 of antennas 1, 2, and 4 and the detection window 2 of antenna 3.

[0061] C. Traverse the idx corresponding to the second detection window of receiving antennas 1, 2, and 4 in turn 1,3 ,idx 2,3 ,idx 4,3 Is the absolute value of less than TH3 (TH3 varies depending on the channel type and is related to the maximum delay spread between multipaths under the current channel type), if it is less than, execute step D, if it is greater, continue traversing;

[0062] D. The difference idx between the maximum peak index of detection window 2 of receiving antennas 1, 2, and 4 and the maximum peak index of detection window 2 of receiving antenna 3 1,3 ,idx 2,3 ,idx 4,3 are all less than TH3, and the corresponding correlation sequence of the detection window 2 of the receiving antenna 1 is recorded as P1(k), k∈[200,399], idx 1,3 If it is greater than 0, it is updated to the sequence P1(k), k∈[200,399], which is cyclically shifted right by 4. The updated related sequence is shown in Figure 8 As shown, the corresponding correlation sequence of the detection window 2 of the receiving antenna 2 is recorded as P2(k), k∈[200,399], idx 2,3 If it is greater than 0, it is updated to the sequence P2(k) cyclically shifted right by 8, and the detection window 2 of the receiving antenna 4 is processed in the same way as above.

[0063] (5) After completing the above steps, output the updated P corresponding to each receiving antenna n (k), the correlation sequences corresponding to each receiving antenna are combined to obtain the updated P(k), which is sent to the subsequent process for conventional signal detection.

[0064] For this embodiment, a comparison diagram of the merged results output by using the method of the present invention and not using the method of the present invention is finally obtained. The two result patterns use different colors respectively. Since they are difficult to see after conversion to black and white, they are not provided. Only the state in the figure is described here, specifically: the peak value of the merged sequence corresponding to the detection window 2 after the implementation of this scheme is 159.638, which is significantly improved compared with the peak value of the merged sequence corresponding to the detection window 2 of 119.46 before the implementation of this scheme. The increase in the peak value of the detection window 2 helps to improve the detection probability of the user.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A signal merging method, characterized in that: The following steps are involved: S1, obtaining the upper interval range of the threshold value TH1 and the correlation sequence of each receiving antenna; S2. Combining the correlation sequences of the receiving antennas to obtain a combined correlation sequence, and calculating the peak-to-average ratio of the combined correlation sequence; S3, if the peak-to-average ratio of the combined correlation sequence is not within the upper interval of the threshold value TH1, the combined correlation sequence is directly output as the signal combination result, otherwise continue to execute step S4; S4, searching each detection window under the correlation sequence of each receiving antenna to obtain the peak value and peak index of the detection window; S5. For each detection window under the correlation sequence of each receiving antenna, find its maximum peak value. If the maximum peak value is greater than the threshold value TH2, record the maximum peak value and the maximum peak index. S6. For each detection window that records the maximum peak value and the maximum peak index under the correlation sequence of each receiving antenna, subtract the other peak indexes of the detection window except the maximum peak index from the maximum peak index to obtain a difference value set idx; S7. For each difference in each difference set idx, if its absolute value is not less than the threshold value TH3, the correlation sequence corresponding to the difference is not updated; otherwise, the correlation sequence corresponding to the difference is updated based on the difference; S8, combining the correlation sequences of the current receiving antennas and outputting the result of signal combination; The upper interval range of the threshold value TH1 is (a, b), where a is the lower limit of the peak-to-average ratio threshold, and b is the upper limit of the peak-to-average ratio threshold, both of which are obtained by simulating the peak-to-average ratio threshold of the low signal-to-noise ratio user missed detection scenario under the multipath channel; The threshold value TH2 is a single antenna user detection threshold, and the threshold value TH3 is obtained according to the maximum delay difference between multipaths; In step S6, for a difference whose absolute value is less than the threshold value TH3, if it is greater than 0, the corresponding correlation sequence is updated by cyclically shifting the difference to the right; if it is not greater than 0, the corresponding correlation sequence is updated by cyclically shifting the difference to the left.

2. The signal merging method according to claim 1, characterized in that: The correlation sequence of the receiving antenna is calculated according to the following formula: Where P(τ) represents the correlation sequence of the receiving antenna, y(n) represents the received signal, x(n) represents the local sequence, N is the sequence length of y(n) and x(n), n is the index number of the signal point in y(n) and x(n), τ is the shift value, and * represents conjugation.

3. The signal merging method according to claim 2, characterized in that: In step S2, the peak-to-average ratio of the combined correlation sequence is the ratio of the peak value of the combined correlation sequence to the average value of the combined correlation sequence.

4. The signal merging method according to claim 3, characterized in that: In step S4, the peak value and peak index of the detection window are searched by retrieving the maximum value from the correlation sequence values ​​corresponding to the detection window and recording it as the peak value of the detection window, and recording the index value corresponding to the maximum value as the peak value of the detection window.

5. The signal merging method according to claim 4, characterized in that: In step S5, for each detection window under the correlation sequence of each receiving antenna, all its peak values ​​need to be sorted in descending order.

6. The signal merging method according to claim 5, characterized in that: In step S5, for a number of detection windows under the correlation sequence of each receiving antenna, if the maximum peak value of one detection window is not greater than the threshold value TH2, the next detection window is traversed until all the detection windows are traversed.

7. An electronic device, characterized in that include: at least one processor, and a memory in communication with the processor; The memory stores instructions, and the instructions are executed by the processor, so that the processor implements the method according to any one of claims 1 to 6 when executing the instructions.

8. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to execute the method according to any one of claims 1 to 6.

Images