CN112333697A - Decoding method and device for physical downlink shared channel in LTE (Long term evolution) - Google Patents
Decoding method and device for physical downlink shared channel in LTE (Long term evolution) Download PDFInfo
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Abstract
The embodiment of the invention provides a decoding method and a device of a physical downlink shared channel in LTE (Long term evolution), wherein the method comprises the following steps: if the ratio of the energy of each resource particle of the to-be-decoded signal of the physical downlink shared channel to the energy of the resource particle of the standard reference signal is judged to meet the preset error vector amplitude condition, acquiring an estimated value of the power parameter of the physical downlink shared channel according to the average amplitude of the resource particles of the to-be-decoded signal; if the preliminary estimation value meeting the preset condition is obtained in the current period and is judged and obtained, and the preliminary estimation value meeting the preset condition is different from the value of the power parameter obtained from the configuration established by the radio resource control connection, obtaining a corresponding power level parameter; and according to the power level parameter, performing high-order decoding on the signal to be decoded. The decoding method and the device for the physical downlink shared channel in the LTE provided by the embodiment of the invention can improve the decoding rate of PDSCH decoding in a safe mode or an encryption mode.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for decoding a physical downlink shared channel in LTE.
Background
In the radio signal analysis, it is generally necessary to perform Physical Downlink Shared Channel (PDSCH) decoding for carrying end user data in LTE (Long Term Evolution).
However, when the UE (user equipment) and the network use the security mode or the encryption mode, many message signaling of the security mode cannot be analyzed, and the resource information allocated to the UE by the network can only be obtained by RRC Connection Setup (radio resource control Connection Setup) for establishing the initial Connection. In the security mode or the ciphering mode, once the network changes the physical resources allocated to the UE, especially when the parameters related to the high-order parsing are changed, the overall decoding rate of the PDSCH may be significantly reduced, thereby affecting the final wireless signal analysis result.
Disclosure of Invention
The embodiment of the invention provides a decoding method and a decoding device for a physical downlink shared channel in LTE (Long term evolution), which are used for solving the defect of low PDSCH decoding rate in a security mode or an encryption mode in the prior art and realizing the improvement of the PDSCH decoding rate.
The embodiment of the invention provides a decoding method of a physical downlink shared channel in LTE, which comprises the following steps:
if the ratio of the energy of each resource particle of the to-be-decoded signal of the physical downlink shared channel to the energy of the resource particle of the standard reference signal is judged to meet a preset error vector amplitude condition, acquiring an estimated value of a power parameter of the physical downlink shared channel according to the average amplitude of each resource particle of the to-be-decoded signal;
if the preliminary estimation value meeting the preset condition is obtained in the current period and is judged and obtained, and the preliminary estimation value meeting the preset condition is different from the value of the power parameter obtained from the configuration established by the radio resource control connection, obtaining a power level parameter corresponding to the preliminary estimation value meeting the preset condition;
and performing high-order decoding on the signal to be decoded according to the power level parameter.
According to the decoding method of the physical downlink shared channel in the LTE of an embodiment of the present invention, after obtaining the estimated value of the power parameter of the physical downlink shared channel according to the average amplitude of each resource particle of the signal to be decoded, the method further includes:
if the preliminary estimation value meeting the preset condition is judged and obtained in the current period, judging whether the number of continuous periods of the preliminary estimation value meeting the preset condition reaches a preset number threshold value or not;
if not, judging whether a preliminary estimation value meeting the preset condition is obtained in the next period.
According to the decoding method of the physical downlink shared channel in the LTE of an embodiment of the present invention, the specific step of determining whether a preliminary estimation value satisfying a preset condition is obtained in a current period includes:
acquiring a preliminary estimation value obtained when the signal-to-noise ratio is maximum in each preliminary estimation value obtained in the current period;
and if the initial estimation value obtained when the signal-to-noise ratio is maximum is in a preset power parameter range, taking the initial estimation value obtained when the signal-to-noise ratio is maximum as the initial estimation value meeting the preset condition.
According to the decoding method of the physical downlink shared channel in the LTE of an embodiment of the present invention, the specific step of obtaining the power level parameter corresponding to the preliminary estimation value satisfying the preset condition includes:
acquiring a power level parameter corresponding to the preliminary estimation value meeting the preset condition according to the preliminary estimation value meeting the preset condition and a matrix mapping table;
the matrix mapping table is a table established according to a 3GPP protocol and used for describing a corresponding relationship between a power parameter and a power level parameter.
According to the decoding method of the physical downlink shared channel in the LTE of an embodiment of the present invention, the preset error vector magnitude condition is that the ratio is smaller than a preset error vector magnitude threshold.
According to the decoding method of the physical downlink shared channel in the LTE of an embodiment of the present invention, if it is determined that a ratio of energy of each resource particle of a signal to be decoded of the physical downlink shared channel to energy of a resource particle of a standard reference signal satisfies a preset error vector magnitude condition, before obtaining an estimated value of a power parameter of the physical downlink shared channel according to an average amplitude of each resource particle of the signal to be decoded, the method further includes:
after the signal to be decoded is subjected to QPSK demodulation and CRC check, the energy of each resource particle of the signal to be decoded in each quadrant is acquired according to a constellation diagram during demodulation, and the energy of each resource particle of the standard reference signal is acquired.
According to the decoding method of the physical downlink shared channel in the LTE of an embodiment of the present invention, after the QPSK demodulation and the CRC check of the signal to be decoded are passed, the method further includes:
and acquiring and storing the average amplitude of each resource particle of the signal to be decoded.
The embodiment of the present invention further provides a decoding device for a physical downlink shared channel in LTE, including:
the parameter estimation module is used for acquiring an estimated value of a power parameter of the physical downlink shared channel according to the average amplitude of each resource particle of the signal to be decoded if the ratio of the energy of each resource particle of the signal to be decoded of the physical downlink shared channel to the energy of the resource particle of the standard reference signal is judged and obtained to meet a preset error vector amplitude condition;
the dynamic estimation module is used for acquiring a power level parameter corresponding to a preliminary estimation value meeting a preset condition if the preliminary estimation value meeting the preset condition is obtained in a current period and is judged and obtained and is different from the value of the power parameter in the establishment configuration of the radio resource control connection;
and the high-order decoding module is used for performing high-order decoding on the signal to be decoded according to the power level parameter.
The embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the processor implements the steps of the method for decoding the physical downlink shared channel in LTE according to any one of the above descriptions when executing the program.
An embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the method for decoding a physical downlink shared channel in LTE according to any one of the above.
In the decoding method and apparatus for physical downlink shared channel in LTE provided by the embodiments of the present invention, when the ratio of the energy of each resource particle of the signal to be decoded in the physical downlink shared channel to the energy of the resource particle of the standard reference signal meets the preset error vector magnitude condition, obtaining the estimated value of the power parameter of the physical downlink shared channel according to the average amplitude of each resource particle of the signal to be decoded, by acquiring a power level parameter corresponding to a preliminary estimate satisfying a preset condition in the case where the preliminary estimate satisfying the preset condition is acquired in a current period and the preliminary estimate satisfying the preset condition is different from a value of a power parameter acquired from a configuration established for a radio resource control connection, and performing high-order decoding on the signal to be decoded according to the corresponding power level parameter, so that the decoding rate of PDSCH decoding in a safe mode or an encryption mode can be improved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a flowchart illustrating a method for decoding a physical downlink shared channel in LTE according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a method for decoding a physical downlink shared channel in LTE according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a decoding apparatus for a physical downlink shared channel in LTE according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device 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 clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In order to overcome the above problems in the prior art, embodiments of the present invention provide a decoding method and apparatus for a physical downlink shared channel in LTE, and the inventive concept is to estimate an actual power parameter according to a parameter obtained by PDSCHQPSK (quadrature phase shift keying) demodulation to obtain a value of a changed power parameter in a security mode or an encryption mode, so that PDSCH decoding can be performed based on the estimated actual value of the power parameter, and a PDSCH decoding rate, especially a decoding rate for high-order (e.g., 16QAM, 64QAM) can be improved to a large extent.
Fig. 1 is a flowchart illustrating a method for decoding a physical downlink shared channel in LTE according to an embodiment of the present invention. The following describes a decoding method of a physical downlink shared channel in LTE according to an embodiment of the present invention with reference to fig. 1. As shown in fig. 1, the method includes: step S101, if the ratio of the energy of each resource particle of the signal to be decoded of the physical downlink shared channel to the energy of the resource particle of the standard reference signal is judged and known to meet a preset error vector amplitude condition, acquiring an estimated value of the power parameter of the physical downlink shared channel according to the average amplitude of each resource particle of the signal to be decoded.
It should be noted that, in the wireless signal analysis process, when the wireless signal of the air interface is analyzed, the processes of signal acquisition, AD conversion, digital mixing, decimation filtering, physical layer decoding, MAC (Media Access Control), RLC (Radio Link Control), RRC (Radio Resource Control), and higher layer protocol analysis need to be performed.
It should be noted that the decoding method for the physical downlink shared channel in the LTE provided in the embodiment of the present invention is particularly suitable for performing PDSCH decoding when the reconfiguration message sent by the network changes the physical parameter p _ a of the UE dedicated channel in the case of encryption.
Specifically, a Resource Element or Resource Element (RE) is the smallest Resource unit in LTE physical resources; occupying 1 OFDM Symbol (1/14ms) in the time domain and 1 subcarrier (15KHz) in the frequency domain.
The standard reference signal is a downlink reference signal of LTE, and is a Demodulation reference signal (DM-RS) for PDSCH.
The signal to be decoded can be demodulated by a common PDSCH demodulation method, and in the demodulation process, the energy of each resource element of the signal to be decoded and the energy of the resource element of the standard reference signal can be acquired.
After the energy of each resource particle of the signal to be decoded and the energy of the resource particle of the standard reference signal are obtained, the ratio of the energy of each resource particle of the signal to be decoded to the energy of the resource particle of the standard reference signal may be obtained.
After the ratio is obtained, whether the ratio meets a preset Error Vector Magnitude (EVM) condition is judged. This error vector magnitude condition may be referred to as an EVM decision condition.
If not, the condition that the power parameter of the physical downlink shared channel is not dynamically estimated is described, demodulation is continued, and the energy of each resource particle of the signal to be decoded and the energy of the resource particle of the standard reference signal are obtained.
If the estimated value meets the condition, the condition that the power parameter of the physical downlink shared channel is dynamically estimated is described, p _ a estimation can be performed based on a constellation diagram during PDSCH demodulation and the resource particle average energy trend adjusted by network power control, the power parameter of the actual physical downlink shared channel is estimated, and the estimated value of the power parameter of the physical downlink shared channel is obtained.
The specific step of estimating the power parameter of the actual physical downlink shared channel based on the constellation diagram during PDSCH demodulation may include:
estimating the position of each resource particle of the signal to be decoded in a constellation diagram according to the average amplitude of each resource particle of the signal to be decoded;
and acquiring an estimated value of the power parameter of the physical downlink shared channel according to the position of each resource particle of the signal to be decoded in the constellation diagram.
The power parameter p _ a of the physical downlink shared channel is a parameter of PDSCH specified in 3GPP (the 3rd Generation Partnership Project) protocol.
The power parameter, p _ a, is important for PDSCH decoding.
Step S102, if the preliminary estimation value meeting the preset condition is obtained in the current period and is judged and known, and the preliminary estimation value meeting the preset condition is different from the value of the power parameter obtained from the configuration established by the radio resource control connection, the power level parameter corresponding to the preliminary estimation value meeting the preset condition is obtained.
Specifically, according to a preset time period, whether a preliminary estimation value meeting a preset condition is obtained in the current period (i.e., the current time period) is periodically judged.
The duration of the predetermined time period may be set according to the actual situation, for example, 12 s. The embodiment of the present invention is not particularly limited to a specific duration value of the preset time period.
It can be understood that the estimated value of the power parameter p _ a is obtained in evm estimation period in case that the ratio of the energy of each resource element of the signal to be decoded to the energy of the resource element of the standard reference signal satisfies the preset error vector magnitude condition.
The duration of the Evm estimation period can be set according to actual conditions, for example, 4 s. The specific duration value of the evm estimation period is not particularly limited by the embodiments of the present invention.
The preliminary estimation values acquired in the current period can be counted, and whether the preliminary estimation values meeting the preset conditions are acquired in the current period is judged according to the counting result.
The preliminary estimation value satisfying the preset condition means that the preliminary estimation value satisfies constraints such as signal-to-noise ratio and duration.
And obtaining a preliminary estimation value meeting a preset condition in the current period, which is called to finish one-time effective p _ a estimation.
The preset power parameter range can be set according to the 3GPP protocol. The embodiments of the present invention are not particularly limited with respect to specific values of the power parameter ranges.
And if the preliminary estimation value meeting the preset condition is acquired, judging whether the preliminary estimation value meeting the preset condition is consistent with the p _ a value acquired from the RRCConnection Setup.
That is, for each actual CRNTI (Cell Radio Network temporary identity) user, it is determined whether to complete an effective p _ a estimation, and after completing the effective p _ a estimation each time, it is compared with the p _ a value obtained in RRCConnectionSetup, and if not, the corresponding p _ a value is updated.
It can be understood that, when an initial network connection is established between a UE (User Equipment) and an eNodeB (Evolved Node B), a p _ a value in a dedicated PDSCH configuration is acquired from rrcconnectionsetup.
The preliminary estimation value satisfying the preset condition is consistent with the value of p _ a obtained from rrcconnection Setup, which indicates that the value of p _ a obtained from rrcconnection Setup can satisfy the current PDSCH decoding requirement.
If the preliminary estimate value satisfying the predetermined condition is different from the value of p _ a obtained from rrcconnection Setup, which indicates that the value of p _ a obtained from rrcconnection Setup does not satisfy the current PDSCH decoding requirement, the value of p _ a used for PDSCH decoding may be updated to the preliminary estimate value satisfying the predetermined condition.
According to the 3GPP protocol, the power level parameter p _ level corresponding to the preliminary estimation value meeting the preset condition can be obtained.
The power level parameter p _ level is also a parameter of the PDSCH specified in the 3GPP protocol.
And S103, performing high-order decoding on the signal to be decoded according to the power level parameter.
Specifically, according to the power level parameter p _ level, when performing PDSCH high-order decoding on a signal to be decoded, the amplitude of the high-order decoding may be adjusted based on the power level parameter p _ level to improve the resolution rate, that is, the decoding rate.
The PDSCH high-order decoding can adopt demodulation methods such as 16QAM and 64 QAM.
16QAM means 16-Quadrature Amplitude Modulation (16-Quadrature Amplitude Modulation) of 16 symbols.
64QAM means 64-Quadrature Amplitude Modulation (64-Quadrature Amplitude Modulation) of 64 kinds of symbols.
It should be noted that, in the LTE radio signal analysis, after the initial connection is established between the UE and the eNodeB, the security mode command is used for encryption, and the RRC reconfiguration message changes the p _ a parameter allocated to the UE.
According to the embodiment of the invention, under the condition that the ratio of the energy of each resource particle of the signal to be decoded of the physical downlink shared channel to the energy of the resource particle of the standard reference signal meets the preset error vector amplitude condition, the estimated value of the power parameter of the physical downlink shared channel is obtained according to the average amplitude value of each resource particle of the signal to be decoded, the power level parameter corresponding to the initial estimated value meeting the preset condition is obtained under the condition that the initial estimated value meeting the preset condition is obtained in the current period and is different from the value of the power parameter obtained from the configuration established by the wireless resource control connection, and the high-order decoding of the signal to be decoded is carried out according to the corresponding power level parameter, so that the decoding rate of PDSCH decoding in a safety mode or an encryption mode can be improved.
Based on the content of the foregoing embodiments, after obtaining the estimated value of the power parameter of the physical downlink shared channel according to the average amplitude of each resource particle of the signal to be decoded, the method further includes: and if the preliminary estimation value meeting the preset condition is judged and obtained in the current period, judging whether the number of the continuous periods of the preliminary estimation value meeting the preset condition reaches a preset number threshold value or not.
Specifically, if the preliminary estimation value satisfying the preset condition is not obtained in the current period, it is determined whether the number of consecutive periods in which the preliminary estimation value satisfying the preset condition is not obtained reaches a preset number threshold.
The number threshold may be set according to the actual situation, for example 3. The embodiment of the present invention is not particularly limited with respect to the specific value of the number threshold. If the preset time period is 12s, judging whether the initial estimation value meeting the preset condition is not obtained within 36s continuously.
If not, judging whether a preliminary estimation value meeting the preset condition is obtained in the next period.
Specifically, if the number of consecutive cycles in which the preliminary estimation value satisfying the preset condition is not obtained reaches the preset number threshold, the dynamic estimation of the p _ a value may be stopped, and the estimation flag of p _ a may be set to be invalid.
If the number of the continuous periods in which the preliminary estimation value meeting the preset condition is not obtained does not reach the preset number threshold, the next period can be used as a new current period, and whether the preliminary estimation value meeting the preset condition is obtained in the period is judged.
According to the embodiment of the invention, whether the initial estimation value meeting the preset condition is acquired in the next period is continuously judged under the condition that whether the number of the continuous periods of the initial estimation value not meeting the preset condition reaches the preset number threshold value, so that the decoding rate of the PDSCH decoding in the security mode or the encryption mode can be improved.
Based on the content of each embodiment, the specific step of judging whether the preliminary estimation value meeting the preset condition is obtained in the current period includes: and acquiring the initial estimation value obtained when the signal-to-noise ratio in each initial estimation value obtained in the current period is maximum.
Specifically, for each p _ a value obtained by estimation, if the p _ a value is consistent with a conventional empirical value, it indicates that the CRNTI is used for detecting a result, and dynamic p _ a estimation needs to be performed in the current period; otherwise, the estimated p _ a value is counted and used for evaluating the p _ a value dynamically at a later time.
And counting the estimated p _ a values, finding the p _ a value with the most estimation times in a judgment period (namely the current period), and recording the holding time of the p _ a value.
When dynamic estimation is carried out, firstly, the signal-to-noise ratio of each preliminary estimation value is obtained through comparison, and the preliminary estimation value obtained when the signal-to-noise ratio is maximum is determined.
It should be noted that, if all the estimation results are low signal-to-noise ratios, the estimation result is kept for a preset number of threshold cycles, the effective estimation identifier is cleared, the estimation result holding duration is cleared, and the next round of estimation statistics is continued. A low signal-to-noise ratio refers to a signal-to-noise ratio below a preset signal-to-noise ratio threshold. The preliminary estimate obtained when the signal-to-noise ratio is maximum is valid and it needs to be satisfied that the maximum signal-to-noise ratio is greater than a preset signal-to-noise ratio threshold.
And if the initial estimation value obtained when the signal-to-noise ratio is maximum is within a preset power parameter range, taking the initial estimation value obtained when the signal-to-noise ratio is maximum as the initial estimation value meeting a preset condition.
Specifically, after determining the preliminary estimation value obtained when the signal-to-noise ratio is the maximum, it may be determined whether the preliminary estimation value is within a preset power parameter range.
The preset power parameter range can be set according to actual conditions, such as 2-5. The embodiment of the present invention is not particularly limited with respect to the specific value of the power parameter range.
And if the initial estimation value obtained when the signal-to-noise ratio is maximum is in a preset power parameter range, completing one effective estimation of p _ a, and clearing the duration of the estimation result.
The embodiment of the invention can obtain the initial estimation value closer to the actual power parameter by dynamically estimating the initial estimation value of the power parameter in the current period, thereby carrying out PDSCH decoding based on the initial estimation value and improving the decoding rate of PDSCH decoding in a safe mode or an encryption mode.
Based on the content of the foregoing embodiments, the specific step of obtaining the power level parameter corresponding to the preliminary estimation value that satisfies the preset condition includes: and acquiring a power level parameter corresponding to the preliminary estimation value meeting the preset condition according to the preliminary estimation value meeting the preset condition and the matrix mapping table.
The matrix mapping table is a table established according to a 3GPP protocol and used for describing a corresponding relationship between a power parameter and a power level parameter.
It should be noted that, possible p _ a values under conditions of 1, 2, 4, 8 antennas, etc. may be listed in advance according to the principle of enumerated p _ a values and power multiplication in the 3GPP protocol, and a matrix mapping table is made for all values of the power parameter and the power level parameter. The matrix mapping table may be used to describe a corresponding relationship between the power parameter p _ a and the power level parameter p _ level.
Specifically, a pre-established matrix mapping table may be queried according to a preliminary estimation value satisfying a preset condition, and a power level parameter corresponding to the preliminary estimation value may be obtained.
According to the embodiment of the invention, the power level parameter corresponding to the initial estimation value meeting the preset condition is obtained through the initial estimation value meeting the preset condition and the matrix mapping table, and the power level parameter closer to the actual power level can be obtained, so that the PDSCH decoding can be carried out based on the power level parameter, and the decoding rate of the PDSCH decoding in a safe mode or an encryption mode can be improved.
Based on the content of the above embodiments, the predetermined error vector magnitude condition is that the ratio is smaller than the predetermined error vector magnitude threshold.
Specifically, an empirical EVM value (i.e., EVM threshold) at the time of QPSK estimation may be preset as the preset error vector magnitude threshold.
The ratio of the energy of each resource particle of the signal to be decoded of the physical downlink shared channel to the energy of the resource particle of the standard reference signal satisfies a preset error vector amplitude condition, and specifically, the ratio of the energy of each resource particle of the signal to be decoded to the energy of the resource particle of the standard reference signal may be smaller than the error vector amplitude threshold.
The embodiment of the invention starts the estimation of the power parameter of the physical downlink shared channel by judging whether the ratio of the energy of each resource particle of the signal to be decoded of the physical downlink shared channel to the energy of the resource particle of the standard reference signal is smaller than the preset error vector amplitude threshold value, thereby carrying out the PDSCH decoding based on the estimated value of the power parameter and improving the decoding rate of the PDSCH decoding in a safe mode or an encryption mode.
Based on the content of the foregoing embodiments, if it is determined that a ratio of energy of each resource particle of a signal to be decoded of a physical downlink shared channel to energy of a resource particle of a standard reference signal satisfies a preset error vector magnitude condition, before obtaining an estimated value of a power parameter of the physical downlink shared channel according to an average amplitude of each resource particle of the signal to be decoded, the method further includes: after QPSK demodulation is carried out on the signal to be decoded and CRC check is passed, the energy of each resource particle of the signal to be decoded in each quadrant is obtained according to a constellation diagram during demodulation, and the energy of each resource particle of a standard reference signal is obtained.
Specifically, a signal to be decoded acquired from a signal source is first QPSK-demodulated.
QPSK is a quaternary phase modulation, has good noise immunity and high frequency band utilization, and is widely used in communication services such as satellite links and digital trunking.
After QPSK demodulation of a signal to be decoded, CRC Check (Cyclic Redundancy Check) may be performed on the demodulated signal to be decoded.
After the CRC check is passed, the energy of each resource element in each quadrant of the actual signal (i.e., the signal to be decoded) and the energy of each resource element of the standard reference signal can be calculated according to the constellation diagram of the PDSCH channel during QPSK demodulation.
According to the embodiment of the invention, the energy of each resource particle of the signal to be decoded in each quadrant is obtained through the constellation diagram of QPSK demodulation of the signal to be decoded, and the energy of each resource particle of the standard reference signal is obtained, so that the estimation of the power parameter of the physical downlink shared channel can be started by judging whether the ratio of the energy of each resource particle of the signal to be decoded of the physical downlink shared channel to the energy of the resource particle of the standard reference signal is smaller than the preset error vector amplitude threshold value, the PDSCH decoding can be carried out based on the estimated value of the power parameter, and the decoding rate of PDSCH decoding in a safety mode or an encryption mode can be improved.
Based on the content of the foregoing embodiments, after performing QPSK demodulation and passing CRC check on a signal to be decoded, the method further includes: and acquiring and storing the average amplitude of each resource particle of the signal to be decoded.
Specifically, when QPSK demodulation is performed on a specific user, the average amplitude of each QPSK distribution in each quadrant resource particle may be recorded according to the set EVM threshold.
When the preset error vector magnitude condition is met, the average magnitude of each QPSK resource particle distributed in each quadrant can be recorded for later estimation of p _ a when PDSCH decoding is performed.
When the PDSCH is decoded, p _ a estimation can be performed using the saved average amplitude of the QPSK distribution in each quadrant resource element after the CRC check passes.
According to the embodiment of the invention, the average amplitude of each resource particle of the signal to be decoded is obtained and stored, and the power parameter can be estimated according to the average amplitude of each resource particle of the signal to be decoded, so that the PDSCH decoding can be carried out based on the estimated value of the power parameter, and the decoding rate of PDSCH decoding in a safe mode or an encryption mode can be improved.
For the convenience of understanding the above embodiments of the present invention, the following describes a decoding procedure of the physical downlink shared channel in LTE by using an embodiment.
The decoding process of the physical downlink shared channel in the LTE may include the following steps:
firstly, when initial network connection is established between UE and eNodeB, acquiring a p _ a parameter in the configuration of a special PDSCH from RRC Connetion Setup;
judging whether to need to carry out dynamic estimation of p _ a or not for each actual CRNTI user, if so, periodically carrying out dynamic estimation of p _ a, and carrying out demodulation of PDSCH QPSK for a specific user needing dynamic estimation;
thirdly, after the demodulation is carried out at PDSCH QPSK and the CRC passes, the energy of each resource particle in each quadrant of the actual reference signal and the energy of each resource particle of the standard reference signal are calculated;
judging whether a p _ a estimation mark needs to be started or not according to a set EVM judgment condition, and recording the average amplitude of the resource particles of the actual signal in each quadrant if the p _ a estimation mark needs to be started for p _ a estimation in the subsequent PDSCH decoding;
recording relevant parameters after the PDSCH passes through the CRC check by adopting QPSK demodulation, and performing the periodic p _ a dynamic estimation process mentioned in the step II by using the parameters;
the periodic dynamic estimation of p _ a is based on a specific statistical period (36s), in which if the estimated p _ a value meets the pre-estimation range (2-5), it is considered to complete an effective dynamic estimation process of p _ a, and the estimated p _ a value is recorded. Otherwise, the p _ a estimation mark is invalid, and the p _ a estimation process is dynamic;
seventhly, possible p _ a values of 1 antenna, 2 antenna and 4 antenna are listed respectively according to enumerated p _ a values in a 3GPP protocol and a principle that power is multiplied and increased, and a matrix mapping table is synthesized according to all the values;
judging whether the estimated p _ a value is consistent with the value obtained from RRCConnationsetup according to the obtained p _ a value, if not, updating the p _ a value, and obtaining a corresponding p _ level value according to a matrix mapping table in the seventh value according to the p _ a value;
and ninthly, adjusting the amplitude of the high-order decoding to improve the analysis passing rate of the PDSCH when the PDSCH decodes the high order through the p _ level value.
Fig. 2 is a flowchart illustrating a method for decoding a physical downlink shared channel in LTE according to an embodiment of the present invention. As shown in fig. 2, the specific flow of the decoding method includes:
step S200, acquiring a data source (signal to be decoded) through the previous signal acquisition, AD conversion, digital mixing, decimation filtering, and the like.
Step S201, physical layer decoding and PDSCH parsing process are performed.
Step S202, after the PDSCH is successfully analyzed, a protocol analysis process is carried out, and whether the current analysis is the RRC Connetion Setup message is judged; if yes, obtaining the corresponding user identification CRNTI, and jumping to the step S203; if not, it jumps to step S216.
Step S203, aiming at a specific user identification CRNTI, judging whether to start p _ a dynamic estimation; if the starting is finished, executing the step S204; if no dynamic estimation of p _ a is turned on, it jumps directly to step S212.
Step S204, performing QPSK demodulation on the PDSCH, after the CRC check is passed, calculating the energy of each resource element of the actual signal in each quadrant and the energy of each resource element of the standard reference signal, and skipping to step S205.
Step S205, according to the set EVM empirical value, when the resource particle energy of the actual signal and the reference signal meets the set EVM judgment condition, skipping to step S206; if the set EVM condition is not satisfied, the process returns to the step S204 to make a decision again.
Step S206, starting the p _ a estimation identification, recording the average amplitude of the resource particles of the actual signal in each quadrant during QPSK demodulation, using the average amplitude for p _ a estimation during the subsequent PDSCH, and skipping to step S207.
In step S207, after the QPSK decoding CRC check of the PDSCH is passed, the estimated p _ a times and an acceptable p _ a times parameter are recorded, and step S209 is performed.
In step S208, p _ a dynamic estimation is performed periodically. This step is executed in a loop all the time, and step S208 is performed using the acquired parameters.
In step S209, the estimated p _ a value when the snr is maximum is recorded with 12S as a statistical period, and the process proceeds to step S210.
Step S210, judging the estimated p _ a value, referring to the 3GPP protocol standard, wherein the p _ a estimation has a certain value range, when the estimated p _ a result is in a reasonable range (2-5), jumping to step S215, otherwise, jumping to step S211.
Step S211, judging whether the estimated p _ a estimates the duration which does not meet the requirement reaches 3 statistical cycles (about 36S); if not, jumping to step S208, and continuing to periodically perform p _ a dynamic estimation; if the estimation result of p _ a does not satisfy the requirement for 3 statistical cycles, go to step S216.
Step S212, judging whether the estimated p _ a value is consistent with the p _ a value acquired in the RRC Connetion Setup, if not, executing step S213, and if so, directly jumping to step S216.
And S213, updating the value of p _ a, acquiring a corresponding value of p _ level according to the matrix mapping table of p _ a, and jumping to the step S214.
Step S214, performing high-order (16QAM, 64QAM) analysis of the subsequent PDSCH according to the p _ level value obtained in step S213 as a parameter.
In step S215, the estimated p _ a value is recorded, and it is considered that one valid p _ a estimation is completed, and the process jumps to step S212 to be executed in a loop.
And step S216, invalidating the p _ a estimation flag and ending the p _ a dynamic estimation process.
The decoding apparatus for the physical downlink shared channel in LTE provided in the embodiments of the present invention is described below, and the decoding apparatus for the physical downlink shared channel in LTE described below and the decoding method for the physical downlink shared channel in LTE described above may be referred to correspondingly.
Fig. 3 is a schematic structural diagram of a decoding apparatus for a physical downlink shared channel in LTE according to an embodiment of the present invention. Based on the content of the foregoing embodiments, as shown in fig. 3, the apparatus includes a parameter estimation module 301, a dynamic estimation module 302, and a higher-order decoding module 303, where:
the parameter estimation module 301 is configured to, if it is determined that a ratio of the energy of each resource particle of the to-be-decoded signal of the physical downlink shared channel to the energy of the resource particle of the standard reference signal satisfies a preset error vector magnitude condition, obtain an estimated value of a power parameter of the physical downlink shared channel according to an average amplitude of each resource particle of the to-be-decoded signal;
a dynamic estimation module 302, configured to obtain a power level parameter corresponding to a preliminary estimation value meeting a preset condition if it is determined that the preliminary estimation value meeting the preset condition is obtained in a current period and the preliminary estimation value meeting the preset condition is different from a value of a power parameter in a radio resource control connection setup configuration;
and a high-order decoding module 303, configured to perform high-order decoding on the signal to be decoded according to the power level parameter.
Specifically, the parameter estimation module 301, the dynamic estimation module 302 and the higher-order decoding module 303 are connected in sequence.
After the parameter estimation module 301 obtains the energy of each resource particle of the signal to be decoded and the energy of the resource particle of the standard reference signal, a ratio of the energy of each resource particle of the signal to be decoded to the energy of the resource particle of the standard reference signal may be obtained; after the ratio is obtained, judging whether the ratio meets a preset error vector amplitude condition or not; if the estimated value meets the condition, the condition that the power parameter of the physical downlink shared channel is dynamically estimated is described, p _ a estimation can be performed based on a constellation diagram during PDSCH demodulation and the resource particle average energy trend adjusted by network power control, the power parameter of the actual physical downlink shared channel is estimated, and the estimated value of the power parameter of the physical downlink shared channel is obtained.
The dynamic estimation module 302 periodically judges whether a preliminary estimation value meeting a preset condition is obtained in a current period according to a preset time period; if the preliminary estimation value meeting the preset condition is obtained, judging whether the preliminary estimation value meeting the preset condition is consistent with the p _ a value obtained from the RRCConnection Setup; if the values are inconsistent, the value of p _ a acquired from the rrcconnectionsetup does not meet the current PDSCH decoding requirement, the value of p _ a used for PDSCH decoding can be updated to the preliminary estimation value meeting the preset condition; according to the 3GPP protocol, the power level parameter p _ level corresponding to the preliminary estimation value meeting the preset condition can be obtained.
The high-order decoding module 303 may adjust the amplitude of the high-order decoding based on the power level parameter p _ level to increase the analysis passing rate, that is, increase the decoding rate, when performing the PDSCH high-order decoding on the signal to be decoded according to the power level parameter p _ level.
It should be noted that the dynamic estimation module 302 is further configured to, if it is determined that the preliminary estimation value meeting the preset condition is not obtained in the current period, determine whether the number of consecutive periods in which the preliminary estimation value meeting the preset condition is not obtained reaches a preset number threshold; if not, judging whether a preliminary estimation value meeting the preset condition is obtained in the next period.
The dynamic estimation module 302 may include a determining sub-module, configured to determine whether a preliminary estimation value meeting a preset condition is obtained in a current period.
The judgment submodule is specifically used for acquiring a primary estimation value obtained when the signal-to-noise ratio is maximum in each primary estimation value obtained in the current period; and if the initial estimation value obtained when the signal-to-noise ratio is maximum is within a preset power parameter range, taking the initial estimation value obtained when the signal-to-noise ratio is maximum as the initial estimation value meeting a preset condition.
The dynamic estimation module 302 further includes a query module, configured to obtain a power level parameter corresponding to the preliminary estimation value that satisfies a preset condition.
And the query module is specifically used for acquiring the power level parameter corresponding to the preliminary estimation value meeting the preset condition according to the preliminary estimation value meeting the preset condition and the matrix mapping table.
The matrix mapping table is a table established according to a 3GPP protocol and used for describing a corresponding relationship between a power parameter and a power level parameter.
The decoding device for the physical downlink shared channel in the LTE provided by the embodiment of the present invention may further include a demodulation module.
And the demodulation checking module is used for acquiring the energy of each resource particle of the signal to be decoded in each quadrant according to the constellation diagram during demodulation after the signal to be decoded is subjected to QPSK demodulation and CRC check is passed, and acquiring the energy of each resource particle of the standard reference signal.
And the demodulation and verification module is also used for acquiring and storing the average amplitude of each resource particle of the signal to be decoded.
The specific method and flow for implementing the corresponding functions of each module included in the decoding apparatus for the physical downlink shared channel in LTE provided in the embodiments of the present invention are described in detail in the above embodiments of the decoding method for the physical downlink shared channel in LTE, and are not described herein again.
The decoding apparatus for the physical downlink shared channel in LTE is used in the decoding method for the physical downlink shared channel in LTE according to the foregoing embodiments. Therefore, the description and definition in the decoding method of the physical downlink shared channel in LTE in the foregoing embodiments may be used for understanding the execution modules in the embodiments of the present invention.
According to the embodiment of the invention, under the condition that the ratio of the energy of each resource particle of the signal to be decoded of the physical downlink shared channel to the energy of the resource particle of the standard reference signal meets the preset error vector amplitude condition, the estimated value of the power parameter of the physical downlink shared channel is obtained according to the average amplitude value of each resource particle of the signal to be decoded, the power level parameter corresponding to the initial estimated value meeting the preset condition is obtained under the condition that the initial estimated value meeting the preset condition is obtained in the current period and is different from the value of the power parameter obtained from the configuration established by the wireless resource control connection, and the high-order decoding of the signal to be decoded is carried out according to the corresponding power level parameter, so that the decoding rate of PDSCH decoding in a safety mode or an encryption mode can be improved.
Fig. 4 illustrates a physical structure diagram of an electronic device, which may include, as shown in fig. 4: a processor (processor)401, a memory (memory)402, and a bus 403; wherein, the processor 401 and the memory 402 complete the communication with each other through the bus 403; the processor 401 is configured to invoke computer program instructions stored in the memory 402 and executable on the processor 401 to execute the method for decoding a physical downlink shared channel in LTE provided by the above-mentioned embodiments of the methods, where the method includes: if the ratio of the energy of each resource particle of the to-be-decoded signal of the physical downlink shared channel to the energy of the resource particle of the standard reference signal is judged to meet the preset error vector amplitude condition, acquiring an estimated value of the power parameter of the physical downlink shared channel according to the average amplitude of each resource particle of the to-be-decoded signal; if the preliminary estimation value meeting the preset condition is obtained in the current period and is judged and obtained, and the preliminary estimation value meeting the preset condition is different from the value of the power parameter obtained from the configuration established by the radio resource control connection, obtaining a power level parameter corresponding to the preliminary estimation value meeting the preset condition; and according to the power level parameter, performing high-order decoding on the signal to be decoded.
Furthermore, the logic instructions in the memory 402 may be implemented in software functional units and stored in a computer readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, an embodiment of the present invention further provides a computer program product, where the computer program product includes a computer program stored on a non-transitory computer-readable storage medium, where the computer program includes program instructions, and when the program instructions are executed by a computer, the computer is capable of executing the method for decoding a physical downlink shared channel in LTE provided by the above-mentioned method embodiments, where the method includes: if the ratio of the energy of each resource particle of the to-be-decoded signal of the physical downlink shared channel to the energy of the resource particle of the standard reference signal is judged to meet the preset error vector amplitude condition, acquiring an estimated value of the power parameter of the physical downlink shared channel according to the average amplitude of each resource particle of the to-be-decoded signal; if the preliminary estimation value meeting the preset condition is obtained in the current period and is judged and obtained, and the preliminary estimation value meeting the preset condition is different from the value of the power parameter obtained from the configuration established by the radio resource control connection, obtaining a power level parameter corresponding to the preliminary estimation value meeting the preset condition; and according to the power level parameter, performing high-order decoding on the signal to be decoded.
In another aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is implemented by a processor to perform the method for decoding a physical downlink shared channel in LTE provided in the foregoing embodiments, where the method includes: if the ratio of the energy of each resource particle of the to-be-decoded signal of the physical downlink shared channel to the energy of the resource particle of the standard reference signal is judged to meet the preset error vector amplitude condition, acquiring an estimated value of the power parameter of the physical downlink shared channel according to the average amplitude of each resource particle of the to-be-decoded signal; if the preliminary estimation value meeting the preset condition is obtained in the current period and is judged and obtained, and the preliminary estimation value meeting the preset condition is different from the value of the power parameter obtained from the configuration established by the radio resource control connection, obtaining a power level parameter corresponding to the preliminary estimation value meeting the preset condition; and according to the power level parameter, performing high-order decoding on the signal to be decoded.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A decoding method for a physical downlink shared channel in LTE (Long term evolution), comprising the following steps:
if the ratio of the energy of each resource particle of the to-be-decoded signal of the physical downlink shared channel to the energy of the resource particle of the standard reference signal is judged to meet a preset error vector amplitude condition, acquiring an estimated value of a power parameter of the physical downlink shared channel according to the average amplitude of each resource particle of the to-be-decoded signal;
if the preliminary estimation value meeting the preset condition is obtained in the current period and is judged and obtained, and the preliminary estimation value meeting the preset condition is different from the value of the power parameter obtained from the configuration established by the radio resource control connection, obtaining a power level parameter corresponding to the preliminary estimation value meeting the preset condition;
and performing high-order decoding on the signal to be decoded according to the power level parameter.
2. The method for decoding the physical downlink shared channel in the LTE according to claim 1, wherein after obtaining the estimated value of the power parameter of the physical downlink shared channel according to the average amplitude of each resource particle of the signal to be decoded, the method further comprises:
if the preliminary estimation value meeting the preset condition is judged and obtained in the current period, judging whether the number of continuous periods of the preliminary estimation value meeting the preset condition reaches a preset number threshold value or not;
if not, judging whether a preliminary estimation value meeting the preset condition is obtained in the next period.
3. The method for decoding the physical downlink shared channel in the LTE according to claim 1, wherein the specific step of determining whether the preliminary estimation value satisfying the preset condition is obtained in the current period includes:
acquiring a preliminary estimation value obtained when the signal-to-noise ratio is maximum in each preliminary estimation value obtained in the current period;
and if the initial estimation value obtained when the signal-to-noise ratio is maximum is in a preset power parameter range, taking the initial estimation value obtained when the signal-to-noise ratio is maximum as the initial estimation value meeting the preset condition.
4. The method for decoding a physical downlink shared channel in LTE according to claim 1, wherein the step of obtaining the power level parameter corresponding to the preliminary estimation value that satisfies the predetermined condition includes:
acquiring a power level parameter corresponding to the preliminary estimation value meeting the preset condition according to the preliminary estimation value meeting the preset condition and a matrix mapping table;
the matrix mapping table is a table established according to a 3GPP protocol and used for describing a corresponding relationship between a power parameter and a power level parameter.
5. The method of claim 1, wherein the predetermined error vector magnitude condition is that the ratio is smaller than a predetermined error vector magnitude threshold.
6. The method for decoding a physical downlink shared channel in LTE according to any one of claims 1 to 5, wherein if it is determined that a ratio of energy of each resource particle of a signal to be decoded of the physical downlink shared channel to energy of a resource particle of a standard reference signal satisfies a preset error vector magnitude condition, before obtaining an estimated value of a power parameter of the physical downlink shared channel according to an average amplitude of each resource particle of the signal to be decoded, the method further includes:
after the signal to be decoded is subjected to QPSK demodulation and CRC check, the energy of each resource particle of the signal to be decoded in each quadrant is acquired according to a constellation diagram during demodulation, and the energy of each resource particle of the standard reference signal is acquired.
7. The method for decoding physical downlink shared channel in LTE according to claim 6, wherein after the QPSK demodulation and the CRC check on the signal to be decoded pass, the method further comprises:
and acquiring and storing the average amplitude of each resource particle of the signal to be decoded.
8. A decoding apparatus for a physical downlink shared channel in LTE, comprising:
the parameter estimation module is used for acquiring an estimated value of a power parameter of the physical downlink shared channel according to the average amplitude of each resource particle of the signal to be decoded if the ratio of the energy of each resource particle of the signal to be decoded of the physical downlink shared channel to the energy of the resource particle of the standard reference signal is judged and obtained to meet a preset error vector amplitude condition;
the dynamic estimation module is used for acquiring a power level parameter corresponding to a preliminary estimation value meeting a preset condition if the preliminary estimation value meeting the preset condition is obtained in a current period and is judged and obtained and is different from the value of the power parameter in the establishment configuration of the radio resource control connection;
and the high-order decoding module is used for performing high-order decoding on the signal to be decoded according to the power level parameter.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the method for decoding physical downlink shared channel in LTE according to any one of claims 1 to 7 when executing the program.
10. A non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the method for decoding a physical downlink shared channel in LTE according to any one of claims 1 to 7.
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