CN117279013B - Port identification method and port identification device - Google Patents
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Abstract
The invention discloses a port identification method and device. The port identification method comprises the following steps: obtaining a maximum power value of time domain channel estimation of a CRS of a first port; determining a signal window and a noise window of each port based on the maximum power value, and acquiring a first signal-to-noise ratio of time domain channel estimation of each port; in response to the first signal-to-noise ratio of the first port being smaller than the threshold signal-to-noise ratio, accumulating signal intensities in signal windows of a plurality of CRSs corresponding to the first port and other ports and noise intensities in the noise windows, and obtaining a second signal-to-noise ratio of the first port, wherein the second signal-to-noise ratio is greater than or equal to the threshold signal-to-noise ratio; according to the signal intensity and the noise intensity, obtaining the correlation factors of the first port to other ports; and identifying the number of actually used ports of the signal transmitting end based on the second signal-to-noise ratio and the correlation factor. The invention can reduce the influence of other port interference signals on port identification and improve the port identification performance under the communication environment with low signal-to-noise ratio and multipath scene.
Description
Technical Field
The present invention relates to mobile communication technology, and in particular, to a port identification method, a port identification apparatus, and a computer readable storage medium.
Background
The fourth generation mobile communication system long term evolution (Long Term Evolution, LTE) system adopts advanced multiple input multiple output (Multiple Input Multiple Output, MIMO) multiple antenna technology, so that the LTE system can greatly improve the throughput rate. The LTE system designs different ports to support MIMO technology. Cell-specific reference signals (Cell Reference Signal, CRS) are designed to support up to 4 ports as an infrastructure of the LTE system. In the network access process, the terminal firstly identifies each antenna Port (Port) to analyze the master information block (Master Information Block, MIB) information and accesses the LTE system.
In User Equipment (UE) system design, antenna port information of CRS is typically hidden during cyclic redundancy check (Cycle Redundancy Check, CRC) of MIB information. In particular, see table 1 below.
TABLE 1
As shown in table 1, in the processing of the physical broadcast channel (Physical Broadcast Channel, PBCH), 3 kinds of CRC masks (masks) are respectively corresponding to the antenna port numbers 1, 2, and 4, and the 3 kinds of CRC masks are respectively used for exclusive-or with CRC results for different antenna port numbers. Thus, the UE can also blindly check the physical broadcast channel using 3 different CRC masks, resulting in the number of antenna ports. That is, the number of antenna ports used by the system CRS may be confirmed only during the receiver's CRC decoding process.
In the prior art, one commonly used port detection method is a blind detection method, that is, in the process of channel estimation and equalization of a receiver, the system performs channel estimation and equalization according to 1 port, 2 ports and 4 ports respectively, analyzes MIB information, and confirms the number of ports actually used by a CRS through a CRC decoding process. However, this method requires three attempts for the channel estimation and equalization process, and the calculation process is complicated. Another method for detecting ports is to identify the ports in advance, and then perform channel estimation and equalization according to the port information to confirm the port information, so as to reduce three attempts required by the blind detection method. However, this method requires that system default bandwidth information is known, and is not suitable for a mobile terminal to quickly identify the port number of CRS in a communication environment such as a Signal-to-noise Ratio (SNR) multipath scenario.
In order to solve the above-mentioned problems in the prior art, there is a need in the art for a port identification technology that can reduce the influence of interference signals of other ports on port identification, thereby improving the port identification performance in a communication environment with low signal-to-noise ratio and multipath scene, and ensuring the reliability of port identification in the use scene of a mobile terminal.
Disclosure of Invention
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
In order to overcome the defects in the prior art, the invention provides a port identification method, a port identification device and a computer readable storage medium, which can reduce the influence of interference signals of other ports on port identification, thereby improving the port identification performance under the communication environment of low signal-to-noise ratio and multipath scene, and further ensuring the reliability of port identification under the use scene of a mobile terminal.
Specifically, the above-mentioned port identification method provided according to the first aspect of the present invention includes the following steps: obtaining a maximum power value of time domain channel estimation of a CRS of a first port; determining a signal window and a noise window of each port based on the maximum power value, and acquiring a first signal-to-noise ratio of time domain channel estimation of each port; responsive to the first signal-to-noise ratio of the first port being less than a threshold signal-to-noise ratio, accumulating signal intensities in signal windows of a plurality of CRSs corresponding to the first port and other ports and noise intensities in noise windows, and obtaining a second signal-to-noise ratio of the first port, wherein the second signal-to-noise ratio is greater than or equal to the threshold signal-to-noise ratio; obtaining correlation factors of the first port to other ports according to the signal intensity and the noise intensity; and identifying the number of actually used ports of the signal transmitting end based on the second signal-to-noise ratio and the correlation factor.
Optionally, in some embodiments, the step of obtaining the maximum power value of the time domain channel estimate of the CRS of the first port includes: based on a system frame head, acquiring frequency domain channel estimation values of a received CRS and a local CRS of an OFDM symbol where each port is located; converting the frequency domain channel estimation value into a time domain channel estimation value through discrete Fourier transform, wherein the number of discrete points is N; and calculating the power value of each discrete point in the time domain channel estimation value of the first port to obtain the maximum power value of the time domain channel estimation of the first port.
Optionally, in some embodiments, the step of determining a signal window and a noise window for each port based on the maximum power value, and obtaining a first signal-to-noise ratio of a time domain channel estimate for each port includes: acquiring the position of the maximum power value of the time domain channel estimation of the first port; the position of the signal window and the position of the noise window of each port are determined by taking the position of the maximum power value as the center; acquiring a power average value in the signal window as signal intensity, and acquiring a power average value in the noise window as noise intensity; and acquiring a first signal-to-noise ratio of the time domain channel estimation of each port based on the signal strength and the noise strength.
Optionally, in some embodiments, the step of determining the position of the signal window and the position of the noise window of each port with the position information of the maximum power value as a center includes: taking the position of the maximum power value as the central position of the information window, and taking the first position preset in front of the information window and the region corresponding to the second position preset in back of the information window as the position of the information window; with discrete points in intermediate positionsTaking the position of the front preset third position and the position of the rear preset fourth position as the central position of the noise window, and taking the corresponding region of the front preset third position and the rear preset fourth position as the position of the noise window.
Optionally, in some embodiments, the step of accumulating the signal strength in the signal window and the noise strength in the noise window of the plurality of CRSs corresponding to the first port and the other ports in response to the first signal-to-noise ratio of the first port being less than the threshold signal-to-noise ratio, and obtaining the second signal-to-noise ratio of the first port includes: acquiring a preset threshold signal-to-noise ratio; in response to the first signal-to-noise ratio of the first port being less than the threshold signal-to-noise ratio, accumulating the signal strength in the signal window of the next CRS on the basis of the signal strength in the signal window of the current CRS of the first port to obtain an accumulated signal strength, and accumulating the noise strength in the noise window of the next CRS on the basis of the noise strength in the noise window of the current CRS of the first port to obtain an accumulated noise strength; and obtaining an updated signal-to-noise ratio according to the accumulated signal strength and the accumulated noise strength, and continuously comparing the updated signal-to-noise ratio with the threshold signal-to-noise ratio until a second signal-to-noise ratio of the first port is obtained.
Optionally, in some embodiments, the step of accumulating the signal strength in the signal window and the noise strength in the noise window of the plurality of CRSs corresponding to the first port and the other ports in response to the first signal-to-noise ratio of the first port being less than the threshold signal-to-noise ratio, and obtaining the second signal-to-noise ratio of the first port further includes: based on the number of CRSs of the first and second ports in one frame being twice that of the third and fourth ports, and the third and fourth ports appearing in pairs, the accumulated signal strength of the fourth port is accumulated as the signal strength of the next CRS of the third port.
Optionally, in some embodiments, the step of accumulating the signal strength in the signal window and the noise strength in the noise window of the plurality of CRSs corresponding to the first port and the other ports in response to the first signal-to-noise ratio of the first port being less than the threshold signal-to-noise ratio, and obtaining the second signal-to-noise ratio of the first port further includes: in response to the accumulated signal strength within a signal window of all CRSs via the first port, and the accumulated noise strength within a noise window, the updated signal-to-noise ratio obtained is less than the threshold signal-to-noise ratio, a decision is made that the signal quality of the first port is insufficient for identification.
Optionally, in some embodiments, the step of obtaining the correlation factor of the first port to other ports according to the signal strength and the noise strength includes: acquiring a first correlation factor of the first port to the second port; judging the first correlation factor and the corresponding first threshold factor, wherein the first threshold factor represents the threshold of the second port to the first port; responsive to the first correlation factor being less than the first threshold factor, determining that the second port is not activated; and in response to the first correlation factor being greater than or equal to the first threshold factor, determining that the second port is in an active state.
Optionally, in some embodiments, the step of obtaining the correlation factor of the first port to other ports according to the signal strength and the noise strength further includes: acquiring a second correlation factor of the first port to a third port and a third correlation factor of the second port to the third port; determining that the second port is in an activated state in response to the determination, and respectively determining the magnitudes of the second correlation factor and the third correlation factor and corresponding second threshold factors, wherein the second threshold factors represent thresholds of the third port to the first port and the second port; and responsive to the second correlation factor being greater than the second threshold factor and the third correlation factor being greater than the second threshold factor, determining that the third port is in an active state and that states of a fourth port and the third port are synchronized.
Optionally, in some embodiments, the step of identifying the number of actually used ports of the signal transmitting end based on the second signal-to-noise ratio and the correlation factor includes: determining whether the signal quality of the first port is sufficient for identification according to the second signal-to-noise ratio; and judging whether the other ports are in the activated state ports according to the first correlation factor, the second correlation factor and the third correlation factor, so as to determine the number of actually used ports of the signal transmitting end.
Further, the above-mentioned port identification device provided according to the second aspect of the present invention includes: a memory; and a processor coupled to the memory and configured to implement the port identification method provided in the first aspect of the present invention.
Further, according to a third aspect of the present invention, there is also provided a computer-readable storage medium having stored thereon computer instructions. The computer instructions, when executed by a processor, implement the method for port identification provided in the first aspect of the present invention.
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The above features and advantages of the present invention will be better understood after reading the detailed description of embodiments of the present disclosure in conjunction with the following drawings. In the drawings, the components are not necessarily to scale and components having similar related features or characteristics may have the same or similar reference numerals.
FIG. 1 illustrates a flow chart of a method of port identification provided in accordance with some embodiments of the invention; and
fig. 2 illustrates a block diagram of a port identification device provided in accordance with some embodiments of the invention.
Reference numerals:
S110-S150;
200. a port identification device;
210. a memory; and
220. a processor.
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present specification, by describing the embodiments of the present invention with specific examples. While the description of the invention will be presented in connection with a preferred embodiment, it is not intended to limit the inventive features to that embodiment. Rather, the purpose of the invention described in connection with the embodiments is to cover other alternatives or modifications, which may be extended by the claims based on the invention. The following description contains many specific details for the purpose of providing a thorough understanding of the present invention. The invention may be practiced without these specific details. Furthermore, some specific details are omitted from the description in order to avoid obscuring the invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the terms "upper", "lower", "left", "right", "top", "bottom", "horizontal", "vertical" as used in the following description should be understood as referring to the orientation depicted in this paragraph and the associated drawings. This relative terminology is for convenience only and is not intended to be limiting of the invention as it is described in terms of the apparatus being manufactured or operated in a particular orientation.
It will be understood that, although the terms "first," "second," "third," etc. may be used herein to describe various elements, regions, layers and/or sections, these elements, regions, layers and/or sections should not be limited by these terms and these terms are merely used to distinguish between different elements, regions, layers and/or sections. Accordingly, a first component, region, layer, and/or section discussed below could be termed a second component, region, layer, and/or section without departing from some embodiments of the present invention.
As described above, in the prior art, one common port detection method is a blind detection method, that is, in the process of channel estimation and equalization performed by the receiver, the system performs channel estimation and equalization according to 1 port, 2 ports, and 4 ports, analyzes MIB information, and confirms the number of ports actually used by the CRS through a CRC decoding process. However, this method requires three attempts for the channel estimation and equalization process, and the calculation process is complicated. Another method for detecting ports is to identify the ports in advance, and then perform channel estimation and equalization according to the port information to confirm the port information, so as to reduce three attempts required by the blind detection method. However, this method requires that system default bandwidth information is known, and is not suitable for a mobile terminal to quickly identify the port number of CRS in a communication environment such as a Signal-to-noise Ratio (SNR) multipath scenario.
In order to solve the above problems in the prior art, the present invention provides a port identification method, a port identification device, and a computer readable storage medium, which can reduce the influence of interference signals of other ports on port identification, thereby improving the port identification performance in a communication environment with low signal-to-noise ratio and multipath scene, and ensuring the reliability of port identification in a mobile terminal use scene.
In some non-limiting embodiments, the above-mentioned port identification method provided by the first aspect of the present invention may be implemented by the above-mentioned port identification device provided by the second aspect of the present invention.
The working principle of the above-described port identification apparatus will be described below in connection with some embodiments of the port identification method. It will be appreciated by those skilled in the art that these examples of port identification methods are merely some non-limiting embodiments provided by the present invention, and are intended to clearly illustrate the general concepts of the present invention and to provide some embodiments that are convenient for public implementation, and are not intended to limit the overall manner or function of the port identification apparatus. Similarly, the port identification device is just a non-limiting embodiment provided by the present invention, and does not limit the implementation subject of each step in the port identification methods.
Referring to fig. 1, fig. 1 illustrates a flow chart of a port identification method provided in accordance with some embodiments of the present invention.
As shown in fig. 1, in some embodiments of the present invention, the port identification method may include the following step S110: and obtaining the maximum power value of the time domain channel estimation of the CRS of the first port.
The signal characteristics of multipath and the like usually occur in the mobile terminal during the moving process, and reference may be made to a third generation partnership project (3rd Generation Partnership Project,3GPP) protocol, which can support mobile communication. Before the mobile terminal analyzes the MIB message of the LTE system, the system bandwidth is unknown, and the PBCH channel carrying the MIB is mapped to the middle 6 Resource Block (RB) positions, so that the receiver can receive at 1.92e6 rate.
Under the condition that the system frame header is acquired, for each Port, performing frequency domain channel estimation on a received CRS of an orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) symbol where a first Port0, a second Port1, a third Port2 and a fourth Port3 are located and a local CRS to obtain a frequency domain channel estimation value. The frequency domain channel estimation values of the ports can be recorded as: port0_est_freqz, port1_est_freqz, port2_est_freqz, port3_est_freqz.
The frequency domain channel estimates for each port may then be converted to the time domain using an N-point discrete fourier transform (Discrete Fourier Transform, DFT). The time domain channel estimation values of the ports can be recorded as: port0_est_time, port1_est_time, port2_est_time, port3_est_time.
Because the first Port0 is sent in a certain way on the standard, other ports (such as the second Port 1 to the fourth Port 3) can be selected according to the version of the system, the supporting capability and other conditions. In some preferred embodiments, the first Port0 may be selected, the power value of each discrete point in its Time domain channel estimation value port0_est_time is calculated, and the maximum power value of the Time domain channel estimation of the first Port0 is searched out, which may be recorded as MaxPwrEstTimePort0.
As shown in fig. 1, the port identification method provided by the present invention may further include step S120: and determining a signal window and a noise window of each port based on the maximum power value, and acquiring a first signal-to-noise ratio of time domain channel estimation of each port.
In some alternative embodiments, the area where the multipath delay of the signal will not be delayed in the wireless propagation process can be selected as the signal window and the noise window of each port, so that the multipath information in the wireless signal can be used for carrying out subsequent port judgment according to the design of the signal window and the noise window.
Specifically, the location of the maximum power value MaxPwrEstTimePort0 of the time domain channel estimate of the first Port0 may be obtained and recorded as maxpossesttimeport 0. The position of the signal window and the position of the noise window of other ports can be determined by centering on the position maxpososttimeport 0 of the maximum power value. Alternatively, the position of the maximum power value may be taken as the central position of the information window, and the area corresponding to the first position preset in front of the information window and the second position preset in back of the information window is taken as the position of the information window. Likewise, the position of the discrete point N/2 at the middle position can be taken as the central position of the noise window, and the positions of the noise window are taken as the areas corresponding to the first two preset third positions and the second two preset fourth positions.
Preferably, an area to which the signal multipath delay must not be delayed may be selected, for example, the preset first position may be selected as the position of the first two power values of the maximum power value position maxpossesttimeport 0, and the preset second position may be selected as the position of the second two power values of the maximum power value position maxpossesttimeport 0. The information window is formed by the two first positions in front of the maximum power value position MaxPOSS EstTimePort0, the positions of the maximum power value and the areas corresponding to the two second positions behind the maximum power value position MaxPOSS EstTimePort 0. The expression of the information window may be as follows: [ MaxPOSSTimePort 0-2, maxPOSSTimePort 0-1, maxPOSSTimePort 0, maxPOSSTimePort 0+1, maxPOSSTimePort 0+2], wherein, -2, -1, 0, 1, 2 represent the positional relationship with the position of maximum power value MaxPOSSTimePort 0, respectively.
Preferably, the area selection of the noise window may also select an area where the signal multipath delay is not necessarily delayed, for example, the preset third position may be selected as the position of the first two discrete points of the discrete point N/2 of the intermediate position, and the preset fourth position may be selected as the position of the second two discrete points of the discrete point N/2 of the intermediate position. Taking the position N/2 of the discrete point at the middle position as the center, taking the positions of the front two third positions and the middle discrete point and the areas corresponding to the rear two fourth positions as noise windows. The expression of the noise window may be as follows: [ N/2-2, N/2-1, N/2, N/2+1, N/2+2], wherein N represents the number of discrete points, -2, -1, 0, 1, 2 represent the positional relationship with the position N/2 of the intermediate discrete point, respectively.
It will be appreciated by those skilled in the art that the above-mentioned information window position and noise window position, and the scheme of 5 length thereof, are only one non-limiting embodiment provided by the present invention, and are intended to clearly illustrate the main concept of the present invention and to provide a specific scheme for public implementation, not to limit the scope of the present invention. Alternatively, in other embodiments, those skilled in the art may use other equivalent methods to obtain the positions of the information window and the noise window, and the lengths thereof, based on the concepts of the present invention, to achieve the same technical effects.
Thereafter, the average value of the power within the signal window is calculated as the signal strength, which can be recorded as: meanpwrsignalwin port0. Likewise, calculating the average of the power within the noise window as the noise intensity can be recorded as: meanpwrnoisewort 0.
Since the first Port0 is certain to transmit, the signal window and noise window of other ports can be determined using the first Port0. Specifically, the synchronization window and the noise window calculated by the Port0 of the first Port may be used as information windows of other ports. The synchronization window is composed of the position corresponding to the maximum power value, the front position, the rear position, the first position and the second position, and the multipath signals are distributed in the synchronization window and have no delay in the wireless transmission process of the signals. The signal windows and noise windows of the other ports may coincide with the first Port0.
The signal strength and noise strength within other port windows are counted. The signal strength of the second Port1 may be recorded as meanpwrsignalwin Port1 and the noise strength of the second Port1 may be recorded as meanpwrnoiseewin Port1, the signal strength of the third Port2 may be recorded as meanpwrsignalwin Port2 and the noise strength of the third Port2 may be recorded as meanpwrnoiseewin Port2, the signal strength of the fourth Port3 may be recorded as meanpwrsignalwin Port3 and the noise strength of the fourth Port3 may be recorded as meanpwrnoiseewin Port3.
Based on the signal strength and noise strength of each port, a first signal-to-noise ratio of the time domain channel estimate for each port may be obtained. The first signal-to-noise ratio of the time domain channel estimation of the first Port0 is SNRPOR0=MeanPwrSignalWinPort 0/MeanPwrNoiseWinPort0, the first signal-to-noise ratio of the time domain channel estimation of the second Port1 is SNRPOR1=MeanPwrSignalWinPort 1/MeanPwrNoiseWinPort1, the first signal-to-noise ratio of the time domain channel estimation of the third Port2 is SNRPOR2=MeanPwrSignalWinPort 2/MeanPwrNoiseWinPort2, and the first signal-to-noise ratio of the time domain channel estimation of the fourth Port3 is SNRPOR3=MeanPwrSignalWinPort 3/MeanPwrNoiseWinPort3.
Continuing to refer to fig. 1, the method for identifying a port provided by the present invention may further include step S130: and in response to the first signal-to-noise ratio of the first port being smaller than the threshold signal-to-noise ratio, accumulating the signal intensities in the signal windows of the CRSs corresponding to the first port and the other ports and the noise intensities in the noise windows, and obtaining the second signal-to-noise ratio of the first port.
In some embodiments, a preset threshold signal-to-noise ratio ThreshHoldSNR may be obtained, through which the Port signal quality of the first Port 0 is identified.
Specifically, in response to the first signal-to-noise ratio of the first Port 0 being less than the threshold signal-to-noise ratio ThreshHoldSNR, the signal strength in the signal window of the next CRS may be accumulated based on the signal strength in the signal window of the current CRS of the first Port 0 to obtain the accumulated signal strength, and at the same time, the noise strength in the noise window of the next CRS may also be accumulated based on the noise strength in the noise window of the current CRS of the first Port to obtain the accumulated noise strength. And according to the accumulated signal strength and the accumulated noise strength, acquiring an updated signal-to-noise ratio, and continuously comparing the updated signal-to-noise ratio with a threshold signal-to-noise ratio ThreshHoldSNR until a second signal-to-noise ratio is acquired, wherein the second signal-to-noise ratio is greater than or equal to the threshold signal-to-noise ratio ThreshHoldSNR.
For example, the magnitude of the first snr SNRPort0 and the threshold snr ThreshHoldSNR of the first Port0 may be determined first, and if SNRPort0< ThreshHoldSNR, it indicates that the signal quality of the current first Port0 is insufficient for identification. At this time, in some embodiments, the signal strength meanpwrsignalwin Port0Next in the signal window of the time domain signal of the Next CRS symbol in the first Port0 may be accumulated, and the obtained accumulated signal strength may be recorded as meanpwrsignalwin Port0+meanpwrsignalwin Port0Next. Meanwhile, the noise intensity in the noise window of the time domain signal of the Next CRS symbol in the first Port0 may be accumulated, and the obtained accumulated noise intensity may be recorded as meanpwrnoiseewindow 0+meanpwrnoiseewindow 0Next. And according to the accumulated signal strength and the accumulated noise strength, re-calculating the updated signal-to-noise ratio SNRPort0, re-analyzing the magnitude relation between the updated signal-to-noise ratio SNRPort0 and the threshold signal-to-noise ratio ThreshHoldSNR, if the updated signal-to-noise ratio SNRPort0 is still smaller than the threshold signal-to-noise ratio ThreshHoldSNR, continuously calculating the strength in a signal window and a noise window of the next CRS symbol in the first Port0, and respectively accumulating to re-update the signal-to-noise ratio SNRPort0 for further comparison with the threshold signal-to-noise ratio ThreshHoldSNR until a second signal-to-noise ratio RPort0 exceeding the threshold signal-to-noise ratio ThreshHoldSNR is obtained, and stopping the accumulating operation of the plurality of CRS symbols in the first Port 0.
When the second signal-to-noise ratio meeting the condition appears, that is, the signal-to-noise ratio of the first Port0 reaches a certain value, the Port judgment result reported later can be determined to be reliable, and the Port signal quality of the first Port0 is enough to be identified.
In the process of accumulating the signal intensities and the noise intensities in the signal window and the noise window of the time domain channel estimation of the plurality of CRS symbols in the first Port0, the corresponding accumulating operation is required to be synchronously performed on other 3 ports (the second Port 1 to the fourth Port 3), and the accumulating of different CRS symbols can reduce the influence of the channel variation on statistics. In practical applications, the accumulated results are directly used by default for comparison.
Further, in the LTE system, since the first Port0 and the second Port 1 occupy 4 OFDM symbols in one subframe, while the third Port 2 and the fourth Port 3 occupy 2 OFDM symbols in one subframe, and since the third Port 2 and the fourth Port 3 are typically present in pairs. Thus, in the accumulation process, the accumulation time and accumulation number of the third Port 2 and the fourth Port 3 are less than half of those of the first Port0 and the second Port 1. That is, the first Port0 and the second Port 1 need to be accumulated 4 times in one subframe, and the third Port 2 and the fourth Port 3 each need to be accumulated 2 times only.
Further, in some preferred embodiments, the accumulated signal strength of the fourth Port 3 may be accumulated as the signal strength of the next CRS of the third Port2. That is, the signal strengths of the fourth Port 3 and the third Port2 may be accumulated first and recorded as meanpwrsignalwin Port2 as a whole. For example, the third Port2 and the fourth Port 3 may be accumulated together, whereby the third Port2 and the fourth Port 3 may also be accumulated 4 times in total in one subframe.
After a period of accumulation time, if the first Port 0 is in, the updated signal-to-noise ratio obtained through the accumulated signal strength and the accumulated noise strength still does not meet the condition. When the accumulated signal strength in the signal window of all CRSs in the first Port 0 and the accumulated noise strength in the noise window are still smaller than the threshold signal-to-noise ratio ThreshHoldSNR, it may be determined that the signal quality of the first Port 0 is insufficient for identification, and a decision failure may be reported.
In the prior art, the port identification judgment is carried out only by using the maximum value of the channel estimation result of the time domain port, the maximum value has unobvious characteristics in a mobile scene, and can not effectively judge signals and interferences, and multipath information is discarded from use only by using the maximum value of the channel estimation result of the time domain port, so that the technical scheme can only be used in the scene with a direct path. In the above embodiment of the present invention, the first Port 0 is utilized to fix the signal transmitting process, and the signal strength and the noise strength of the signal window and the noise window of the time domain channel estimation of the plurality of CRS symbols in each Port are accumulated for multiple times, so that the signal window and the noise window are dynamically designed for other ports, and the maximum value outside the signal window is considered as the interference part, thereby improving the signal-to-noise ratio, reducing the influence of the interference signals of other ports on the Port identification decision, and further improving the identification performance in the low signal-to-noise ratio environment. Also, during the intensity accumulation within each window, the intensity (power) of both the signal and noise is increasing, but in contrast the signal intensity is increasing more, so that the signal-to-noise ratio can be improved. Meanwhile, considering the influence of multipath time delay, the multipath signal can be contained in the signal window, and the power value of each multipath is used as the effective signal strength, so that the system identification capability is improved, one CRS symbol represents the multipath distribution at one moment, and the accumulation of a plurality of CRS symbols can obtain the macroscopic multipath distribution condition, so that the signal power can be counted more accurately.
As shown in fig. 1, the method for identifying a port provided by the present invention may further include step S140: and obtaining the correlation factors of the first port to other ports according to the signal intensity and the noise intensity.
Specifically, in some embodiments, a first correlation factor CorrRatePort0Port1 of the first Port0 to the second Port1 is obtained, wherein the first correlation factor CorrRatePort0Port1 = meanpwrsignalwin Port0/meanpwrsignalwin Port1. And acquiring a second correlation factor CorrRatePort0Port2 of the first Port Port0 to the third Port Port2, wherein the second correlation factor CorrRatePort0Port 2=MeanPwrSignalWinPort 0/MeanPwrSignalWinPort 2. And calculating a third correlation factor CorrRatePort1Port2 of the second Port Port1 to the third Port Port2, wherein the third correlation factor CorrRatePort1Port 2=MeanPwrSignalWinPort 1/MeanPwrSignalWinPort 2. Although the power of each Port is theoretically consistent, the correlation factor of the two channels is theoretically 1, in practice, the difference between different ports caused by multipath and other factors needs to be considered, so in the embodiment of the present invention, the correlation factor of the first Port0 to the other ports needs to be calculated.
First, the first correlation factor CorrRatePort0Port1 and the corresponding first threshold factor ThreshHold0 are determined, where the first threshold factor CorrRatePort0Port1 may represent a threshold of the second Port1 to the first Port0, and in response to the first correlation factor CorrRatePort0Port1 being less than the first threshold factor ThreshHold0, the second Port1 is determined to be not activated. Whereas the second Port1 is in the inactive state, the third Port2 and the fourth Port 3 are necessarily also in the inactive state.
In response to the first correlation factor CorrRatePort0Port1 being greater than or equal to the first threshold factor ThreshHold0, a decision is made to determine that the second Port1 is in an active state. In the case that the second Port1 is determined to be in the active state, it may be further determined whether the third Port2 and the fourth Port 3 are in the active state.
Since the states of the third Port2 and the fourth Port 3 are synchronized, optionally, in some embodiments of the present invention, the decision mode of the second Port2 is illustrated as an example. Specifically, the second correlation factor CorrRatePort0Port2 and the third correlation factor CorrRatePort1Port2 are determined to be in the size of the corresponding second threshold factor ThreshHold1, where the second threshold factor ThreshHold1 may represent the threshold of the third Port2 for the first Port0 and the second Port1, and in response to the second correlation factor CorrRatePort0Port2 being greater than the second threshold factor ThreshHold1 and the third correlation factor CorrRatePort1Port2 also being greater than the second threshold factor ThreshHold1, the third Port2 may be determined to be in the active state and the fourth Port 3 synchronized with the state of the third Port2 may also be in the active state. Otherwise, if any one of the second correlation factor corerateport 0Port2 and the third correlation factor corerateport 1Port2 does not reach the second threshold factor ThreshHold1, the third Port2 and the fourth Port 3 are in an inactive state.
In the above-listed embodiments of the present invention, the first threshold factor threshold 0 and the second threshold factor threshold 1 may be the same value theoretically, but in practice, the value of the second threshold factor threshold 1 may be lower than the first threshold factor threshold 0, because the second threshold factor threshold 1 needs to be compared with the first Port 0 and the first Port 2 respectively, and slightly reducing the value of the second threshold factor threshold 1 may improve the reliability of the decision.
Since the first Port 0 is necessarily used for signaling during the signaling process of the LTE system, and other Port systems may not transmit, in the above embodiment of the present invention, since the first Port 0 has been compared with the threshold signal-to-noise ratio ThreshHoldSNR, the other ports (the second Port 1 to the fourth Port 3) can be compared with the first Port 0 through the correlation coefficient, which can be understood as indirectly comparing the other ports with the threshold signal-to-noise ratio ThreshHoldSNR, so as to determine the signal quality of the other ports.
Continuing to refer to fig. 1, the method for identifying a port provided by the present invention may further include step S150: based on the second signal-to-noise ratio and the correlation factor, the number of actually used ports of the signal transmitting end is identified.
Specifically, in some embodiments, according to the second snr of the first Port0, a Port with a signal quality sufficient for identification among the ports (the first Port0 to the fourth Port 3) may be determined. Further, according to the first correlation factor CorrRatePort0Port1, the second correlation factor CorrRatePort0Port2 and the third correlation factor CorrRatePort1Port2, the ports in the active state can be determined and determined by judgment in the ports sufficient for identification, so that the number of actually used ports of the signal transmitting end can be identified. In the above embodiment of the present invention, the LTE system content identifies the number of ports according to the statistical characteristics, so that external input parameters are not required.
While, for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated that the methodologies are not limited by the order of acts, as some acts may, in accordance with one or more embodiments, occur in different orders and/or concurrently with other acts from that shown and described herein or not shown and described herein, as would be understood and appreciated by those skilled in the art.
Thus, the Port identification method provided in the first aspect of the present invention has been described, and the Port identification method uses the certain use feature of the first Port0 in the LTE system, dynamically selects the signal window and the noise window according to the time domain channel estimation power value of the first Port0, and calculates the signal to noise ratio. And dynamically accumulating time domain channel estimation results of the CRS symbols, judging correlation factors of other ports, analyzing whether the other ports are activated or not, obtaining CRS port information of an actual system, and confirming by using CRC. The technical scheme provided by the invention can meet the requirement that the mobile terminal can rapidly identify the number of the actually used ports of the signal transmitting terminal in the mobile environment.
Referring to fig. 2, fig. 2 illustrates a block diagram of a port identification device according to some embodiments of the invention.
As shown in fig. 2, the memory 210 and the processor 120 may be configured in the port identification device 200. Memory 210 includes, but is not limited to, the computer-readable storage media described above provided by the third aspect of the invention, having stored thereon computer instructions. The processor 220 may be coupled to the memory 210 and configured to execute computer instructions stored on the memory 210 to implement the above-described port identification method provided in the first aspect of the present invention.
In summary, the present invention provides a port identification method, a port identification device, and a computer readable storage medium, which can reduce the influence of interference signals of other ports on port identification, thereby improving the port identification performance in a communication environment with low signal-to-noise ratio and multipath scene, and ensuring the reliability of port identification in a mobile terminal usage scene.
The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. A method of port identification comprising the steps of:
obtaining a maximum power value of time domain channel estimation of a CRS of a first port;
determining the positions of a signal window and a noise window of each port and the corresponding signal intensity and noise intensity based on the position of the maximum power value, so as to obtain a first signal-to-noise ratio of time domain channel estimation of each port;
in response to the first signal-to-noise ratio of the first port being smaller than a threshold signal-to-noise ratio, accumulating signal intensities in signal windows of a plurality of CRSs corresponding to the first port and noise intensities in corresponding noise windows, and accumulating signal intensities in signal windows of a plurality of CRSs corresponding to other ports and noise intensities in corresponding noise windows, so as to obtain a second signal-to-noise ratio of the first port, wherein the second signal-to-noise ratio is greater than or equal to the threshold signal-to-noise ratio;
obtaining correlation factors of the first port to other ports according to the ratio of the signal intensities between the first port and the other ports; and
and identifying the number of actually used ports of the signal transmitting end based on the second signal-to-noise ratio and the correlation factor.
2. The port identification method of claim 1, wherein the step of obtaining a maximum power value of a time domain channel estimate of a CRS of a first port comprises:
Based on a system frame head, acquiring frequency domain channel estimation values of a received CRS and a local CRS of an OFDM symbol where each port is located;
converting the frequency domain channel estimation value into a time domain channel estimation value through discrete Fourier transform, wherein the number of discrete points is N; and
and calculating the power value of each discrete point in the time domain channel estimation value of the first port to obtain the maximum power value of the time domain channel estimation of the first port.
3. The port identification method of claim 2 wherein said step of determining signal windows and noise windows for each port based on said maximum power values and obtaining a first signal-to-noise ratio of a time domain channel estimate for each port comprises:
acquiring the position of the maximum power value of the time domain channel estimation of the first port;
the position of the signal window and the position of the noise window of each port are determined by taking the position of the maximum power value as the center;
acquiring a power average value in the signal window as signal intensity, and acquiring a power average value in the noise window as noise intensity; and
and acquiring a first signal-to-noise ratio of the time domain channel estimation of each port based on the signal strength and the noise strength.
4. The port identification method as claimed in claim 3, wherein the step of determining the position of the signal window and the position of the noise window for each port centering on the position information of the maximum power value comprises:
taking the position of the maximum power value as the central position of the information window, taking the area corresponding to the first position preset in front and the second position preset in back as the position of the information window, and
to be at discrete points in intermediate positionsTaking the position of the front preset third position and the position of the rear preset fourth position as the central position of the noise window, and taking the corresponding region of the front preset third position and the rear preset fourth position as the position of the noise window.
5. The method of port identification of claim 1, wherein the step of accumulating signal strengths within signal windows and noise strengths within noise windows of a plurality of CRSs corresponding to the first port and other ports in response to the first signal-to-noise ratio of the first port being less than a threshold signal-to-noise ratio, and obtaining the second signal-to-noise ratio of the first port comprises:
acquiring a preset threshold signal-to-noise ratio;
in response to the first signal-to-noise ratio of the first port being less than the threshold signal-to-noise ratio, accumulating the signal strength in the signal window of the next CRS on the basis of the signal strength in the signal window of the current CRS of the first port to obtain an accumulated signal strength, and accumulating the noise strength in the noise window of the next CRS on the basis of the noise strength in the noise window of the current CRS of the first port to obtain an accumulated noise strength; and
And acquiring an updated signal-to-noise ratio according to the accumulated signal strength and the accumulated noise strength, and continuously comparing the updated signal-to-noise ratio with the threshold signal-to-noise ratio until a second signal-to-noise ratio of the first port is obtained.
6. The method of port identification of claim 5, wherein the step of accumulating signal strengths within signal windows and noise strengths within noise windows of a plurality of CRSs corresponding to the first port and other ports in response to the first signal-to-noise ratio of the first port being less than a threshold signal-to-noise ratio, and obtaining a second signal-to-noise ratio of the first port further comprises:
based on the number of CRSs of the first and second ports in one frame being twice that of the third and fourth ports, and the third and fourth ports appearing in pairs, the accumulated signal strength of the fourth port is accumulated as the signal strength of the next CRS of the third port.
7. The method of port identification of claim 5, wherein the step of accumulating signal strengths within signal windows and noise strengths within noise windows of a plurality of CRSs corresponding to the first port and other ports in response to the first signal-to-noise ratio of the first port being less than a threshold signal-to-noise ratio, and obtaining a second signal-to-noise ratio of the first port further comprises:
In response to the accumulated signal strength within a signal window of all CRSs via the first port, and the accumulated noise strength within a noise window, the updated signal-to-noise ratio obtained is less than the threshold signal-to-noise ratio, a decision is made that the signal quality of the first port is insufficient for identification.
8. The port identification method of claim 1, wherein the step of obtaining correlation factors of the first port for other ports based on the signal strength and the noise strength comprises:
acquiring a first correlation factor of the first port to the second port;
judging the first correlation factor and the corresponding first threshold factor, wherein the first threshold factor represents the threshold of the second port to the first port;
responsive to the first correlation factor being less than the first threshold factor, determining that the second port is not activated; and
and in response to the first correlation factor being greater than or equal to the first threshold factor, determining that the second port is in an active state.
9. The port identification method of claim 8, wherein the step of obtaining correlation factors of the first port for other ports based on the signal strength and the noise strength further comprises:
Acquiring a second correlation factor of the first port to a third port and a third correlation factor of the second port to the third port;
determining that the second port is in an activated state in response to the determination, and respectively determining the magnitudes of the second correlation factor and the third correlation factor and corresponding second threshold factors, wherein the second threshold factors represent thresholds of the third port to the first port and the second port; and
in response to the second correlation factor being greater than the second threshold factor and the third correlation factor being greater than the second threshold factor, a decision determines that the third port is in an active state and that states of a fourth port and the third port are synchronized.
10. The port identification method as claimed in claim 9, wherein the step of identifying the number of actually used ports of the signal transmitting terminal based on the second signal-to-noise ratio and the correlation factor comprises:
determining whether the signal quality of the first port is sufficient for identification according to the second signal-to-noise ratio; and
and judging whether the other ports are in an activated state according to the first correlation factor, the second correlation factor and the third correlation factor, so as to determine the number of actually used ports of the signal transmitting end.
11. A port identification device, comprising:
a memory; and
a processor connected to the memory and configured to implement the port identification method of any one of claims 1-10.
12. A computer readable storage medium having stored thereon computer instructions which, when executed by a processor, implement the port identification method according to any of claims 1 to 10.
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