OFDM symbol power control method and device
By generating the target power gain based on the predicted power parameters of adjacent OFDM symbols, the problem of uneven power of sub-carrier in the OFDM system is solved, and the stability and reliability of the system are improved.
Patent Information
- Application Number
- CN202410134336.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-30
- Publication Date
- 2025-07-25
AI Technical Summary
The power difference between subcarriers in OFDM system and the time-varying and frequency selective fading of wireless channels lead to uneven signal power distribution, affecting system performance.
By obtaining the power-related parameters of adjacent OFDM symbols, the power parameters of the current OFDM symbols are predicted, and the target power gain is generated based on the prediction parameters and the initial power gain, and power control is performed.
Reliance on real-time channel state information is reduced, power control algorithms are simplified, computing complexity and processing delays are reduced, and system stability and reliability are improved.
Smart Images
Figure CN120379005A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of terminals, and in particular, to a method and apparatus for power control of OFDM symbols. Background Art
[0002] Orthogonal Frequency Division Multiplexing (OFDM) technology, as an efficient modulation technology, has been widely used in modern wireless communication systems. The OFDM system improves the spectrum utilization rate and the ability to resist multipath interference by allocating data streams to multiple subcarriers for parallel transmission. However, due to the power difference between subcarriers in the OFDM system, as well as the time-varying and frequency-selective fading of the wireless channel, the signal power distribution of each subcarrier is uneven. Therefore, it is particularly important to implement power control for OFDM symbols. Summary of the Invention
[0003] The present disclosure provides a method and apparatus for power control of OFDM symbols to at least solve the problem that the signal power distribution of each subcarrier is uneven due to the power difference between subcarriers in the OFDM system, as well as the time-varying and frequency-selective fading of the wireless channel. The technical solution of the present disclosure is as follows:
[0004] According to a first aspect of an embodiment of the present disclosure, a method for power control of an OFDM symbol is provided, including: obtaining a first initial power gain corresponding to a first orthogonal frequency division multiplexing (OFDM) symbol; obtaining power-related parameters corresponding to a second OFDM symbol, where the second OFDM symbol is the previous OFDM symbol adjacent to the first OFDM symbol; obtaining a predicted power parameter corresponding to the first OFDM symbol based on the power-related parameters corresponding to the second OFDM symbol; generating a target power gain corresponding to the first OFDM symbol based on the predicted power parameter and the first initial power gain, and performing power control on the first OFDM symbol based on the target power gain.
[0005] In some embodiments, the power-related parameters corresponding to the second OFDM symbol include a second initial power gain and a second power variance. Obtaining a predicted power parameter corresponding to the first OFDM symbol based on the power-related parameters corresponding to the second OFDM symbol includes: obtaining a power adjustment coefficient corresponding to the first OFDM symbol; obtaining a predicted power gain corresponding to the first OFDM symbol based on the power adjustment coefficient and the second initial power gain; obtaining a predicted power variance corresponding to the first OFDM symbol based on the power adjustment coefficient and the second power variance; and forming a predicted power parameter based on the predicted power gain and the predicted power variance.
[0006] In some embodiments, generating a target power gain corresponding to a first OFDM symbol based on a predicted power parameter and a first initial power gain includes: obtaining a reference variance corresponding to the first OFDM symbol; obtaining a gain coefficient corresponding to the first OFDM symbol based on the predicted power variance and the reference variance corresponding to the first OFDM symbol; and generating a target power gain corresponding to the first OFDM symbol based on the predicted power gain, the gain coefficient, and the first initial power gain corresponding to the first OFDM symbol.
[0007] In some embodiments, obtaining a first initial power gain corresponding to a first Orthogonal Frequency Division Multiplexing (OFDM) symbol includes: performing point sampling on the cyclic prefix of the first OFDM symbol to obtain a sample point sequence; obtaining the sample point power corresponding to the first OFDM symbol based on each complex sample point in the sample point sequence; obtaining the target power of the first OFDM symbol; obtaining the difference between the target power and the sample point power, and using the difference as the first initial power gain corresponding to the first OFDM symbol.
[0008] In some embodiments, obtaining a reference variance corresponding to the first OFDM symbol includes: obtaining a target symbol period in which the first OFDM symbol is located, where the target symbol period includes a plurality of OFDM symbols; and obtaining the reference variance corresponding to the target symbol period as the reference variance corresponding to the first OFDM symbol.
[0009] In some embodiments, the method for obtaining the reference variance corresponding to the target symbol period includes: obtaining the sample point power of each of the plurality of OFDM symbols included in the previous symbol period adjacent to the target symbol period; generating the reference variance corresponding to the target symbol period based on the sample point power of each of the plurality of OFDM symbols included in the previous symbol period; where the number of OFDM symbols included in each symbol period is the same.
[0010] In some embodiments, after generating a target power gain corresponding to a first OFDM symbol based on a predicted power parameter and a first initial power gain, it further includes: updating a power adjustment coefficient based on the first initial power gain and a second initial power gain; where the updated power adjustment coefficient is used as the power adjustment coefficient corresponding to a third OFDM symbol, where the third OFDM symbol is the next OFDM symbol adjacent to the first OFDM symbol.
[0011] In some embodiments, after generating the target power gain corresponding to the first OFDM symbol based on the predicted power parameter and the first initial power gain, the method further includes: obtaining a first power variance corresponding to the first OFDM symbol based on the gain coefficient corresponding to the first OFDM symbol and the predicted power variance corresponding to the first OFDM symbol; using the first power variance corresponding to the first OFDM symbol and the first initial power gain as the power-related parameters corresponding to the first OFDM symbol; wherein the power-related parameters corresponding to the first OFDM symbol are used to calculate the target power gain corresponding to the third OFDM symbol.
[0012] According to a second aspect of the embodiments of the present disclosure, there is provided a power control device for OFDM symbols, including: a first obtaining module, configured to obtain a first initial power gain corresponding to a first orthogonal frequency division multiplexing (OFDM) symbol; a second obtaining module, configured to obtain power-related parameters corresponding to a second OFDM symbol, where the second OFDM symbol is the previous OFDM symbol adjacent to the first OFDM symbol; a third obtaining module, configured to obtain a predicted power parameter corresponding to the first OFDM symbol based on the power-related parameters corresponding to the second OFDM symbol; and a power control module, configured to generate a target power gain corresponding to the first OFDM symbol based on the predicted power parameter and the first initial power gain, and perform power control on the first OFDM symbol based on the target power gain.
[0013] In some embodiments, the third obtaining module is further configured to: obtain a power adjustment coefficient corresponding to the first OFDM symbol; obtain a predicted power gain corresponding to the first OFDM symbol based on the power adjustment coefficient and a second initial power gain; obtain a predicted power variance corresponding to the first OFDM symbol based on the power adjustment coefficient and a second power variance; and form a predicted power parameter based on the predicted power gain and the predicted power variance.
[0014] In some embodiments, the power control module is further configured to: obtain a reference variance corresponding to the first OFDM symbol; obtain a gain coefficient corresponding to the first OFDM symbol based on the predicted power variance corresponding to the first OFDM symbol and the reference variance; and generate a target power gain corresponding to the first OFDM symbol based on the predicted power gain, the gain coefficient, and the first initial power gain corresponding to the first OFDM symbol.
[0015] In some embodiments, the first obtaining module is further configured to: perform point sampling on the cyclic prefix of the first OFDM symbol to obtain a sample point sequence; obtain the sample point power corresponding to the first OFDM symbol based on each complex sample point in the sample point sequence; obtain the target power of the first OFDM symbol; and obtain the difference between the target power and the sample point power, and use the difference as the first initial power gain corresponding to the first OFDM symbol.
[0016] In some embodiments, the power control module is further configured to: obtain a target symbol period in which the first OFDM symbol is located, where the target symbol period includes a plurality of OFDM symbols; and obtain a reference variance corresponding to the target symbol period as the reference variance corresponding to the first OFDM symbol.
[0017] In some embodiments, the power control module is further configured to: obtain the sample powers of the plurality of OFDM symbols included in the previous symbol period adjacent to the target symbol period; generate a reference variance corresponding to the target symbol period based on the sample powers of the plurality of OFDM symbols included in the previous symbol period; where the number of OFDM symbols included in each symbol period is the same.
[0018] In some embodiments, the power control module is further configured to: update a power adjustment coefficient based on a first initial power gain and a second initial power gain; where the updated power adjustment coefficient is used as the power adjustment coefficient corresponding to a third OFDM symbol, where the third OFDM symbol is the next OFDM symbol adjacent to the first OFDM symbol.
[0019] In some embodiments, the power control module is further configured to: obtain a first power variance corresponding to the first OFDM symbol based on the gain coefficient corresponding to the first OFDM symbol and the predicted power variance corresponding to the first OFDM symbol; use the first power variance corresponding to the first OFDM symbol and the first initial power gain as power-related parameters corresponding to the first OFDM symbol; where the power-related parameters corresponding to the first OFDM symbol are used to calculate the target power gain corresponding to the third OFDM symbol.
[0020] According to a third aspect of the embodiments of the present disclosure, an electronic device is provided, including: at least one processor; and a memory communicatively connected to the at least one processor; where the memory stores instructions executable by the at least one processor, and when the instructions are executed by the at least one processor, the power control method for OFDM symbols as described in the embodiments of the first aspect of the present application is implemented.
[0021] According to a fourth aspect of the embodiments of the present disclosure, a non-transitory computer-readable storage medium storing computer instructions is provided, where the computer instructions are used to implement the power control method for OFDM symbols as described in the embodiments of the first aspect of the present application.
[0022] According to a fifth aspect of the embodiments of the present disclosure, a computer program product is provided, including a computer program, where when the computer program is executed by a processor, the power control method for OFDM symbols as described in the embodiments of the first aspect of the present application is implemented.
[0023] The technical solutions provided by the embodiments of the present disclosure at least bring the following beneficial effects: By predicting based on adjacent OFDM symbols, this application reduces the dependence on real-time channel state information, simplifies the power control algorithm, reduces the computational complexity and processing delay. Through more stable power control, it is possible to reduce the system performance fluctuations caused by power fluctuations, which helps to optimize the transmission quality and improve the stability and reliability of the system.
[0024] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure and do not constitute an undue limitation to the present disclosure.
[0026] Figure 1 It is a schematic diagram of an exemplary embodiment of a power control method for an OFDM symbol.
[0027] Figure 2 It is a schematic diagram showing the relationship between a power control device for an OFDM symbol and an OFDM processing unit according to an exemplary embodiment.
[0028] Figure 3 It is a schematic diagram of a power control process for an OFDM symbol according to an exemplary embodiment.
[0029] Figure 4 It is a schematic diagram of an exemplary embodiment of a power control method for an OFDM symbol.
[0030] Figure 5 It is a schematic diagram showing the relationship between an OFDM symbol and a symbol period according to an exemplary embodiment.
[0031] Figure 6 It is a schematic diagram of a power control device for an OFDM symbol according to an exemplary embodiment.
[0032] Figure 7 It is a block diagram of an electronic device according to an exemplary embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0033] In order to enable those of ordinary skill in the art to better understand the technical solutions of the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings.
[0034] It should be noted that the terms "first", "second", etc. in the description, claims and the above-mentioned drawings of the present disclosure are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described here can be implemented in an order other than those illustrated or described here. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.
[0035] Figure 1 is a schematic diagram of an exemplary embodiment of a power control method for an OFDM symbol shown in this application. As Figure 1 shown, the power control method for the OFDM symbol includes the following steps:
[0036] S101, obtain a first initial power gain corresponding to a first orthogonal frequency division multiplexing (OFDM) symbol.
[0037] Figure 2 is a schematic diagram of the relationship between a power control device for an OFDM symbol and an OFDM processing unit shown in this application. As Figure 2 shown, the OFDM processing unit mainly completes the functions of input power control, matched filtering, removing cyclic prefix (CP), and time-frequency domain conversion. The power control device for the OFDM symbol is used to control the power of the OFDM symbol to ensure that the processing of the OFDM processing unit is within the optimal data power range.
[0038] Optionally, in this application, the cyclic prefix of the first OFDM symbol can be sampled to obtain the sample power of the sampling points, and the difference between the sample power and the target power that the first OFDM symbol is required to reach preset is used as the first initial power gain corresponding to the first OFDM symbol.
[0039] Among them, the first initial power gain will be used as the basis for subsequently obtaining the target power gain corresponding to the first OFDM symbol.
[0040] S102, obtain power-related parameters corresponding to a second OFDM symbol, where the second OFDM symbol is the previous OFDM symbol adjacent to the first OFDM symbol.
[0041] The power-related parameters refer to the parameters related to the transmission power of the second OFDM symbol. The power-related parameters may include a second initial power gain and a second power variance.
[0042] S103. Obtain the predicted power parameter corresponding to the first OFDM symbol based on the power-related parameter corresponding to the second OFDM symbol.
[0043] Predict the channel state of the first OFDM symbol according to the power-related parameter of the second OFDM symbol. This prediction method can reduce the system's dependence on real-time channel state information, thereby simplifying the power control algorithm. The predicted power parameter includes the predicted power gain and the predicted power variance, which will be used to calculate the target power gain of the first OFDM symbol.
[0044] S104. Generate the target power gain corresponding to the first OFDM symbol based on the predicted power parameter and the first initial power gain, and perform power control on the first OFDM symbol based on the target power gain.
[0045] Exemplarily, if it is currently necessary to obtain the target power gain of the 186th OFDM symbol, obtain the predicted power parameter corresponding to the 186th OFDM symbol based on the power-related parameter corresponding to the 185th OFDM symbol, and generate the target power gain corresponding to the 186th OFDM symbol based on the predicted power parameter corresponding to the 186th OFDM symbol and the first initial power gain corresponding to the 186th OFDM symbol.
[0046] Figure 3 It is a schematic diagram of the power control process of an OFDM symbol shown in this application. As Figure 3 shown, in this application, the constraint condition to be satisfied is that the sum of the sampling duration and the duration of calculating the target power gain corresponding to the current first OFDM symbol is less than the duration of the cyclic prefix of the first OFDM symbol.
[0047] Since in some scenarios where precise power control is required, hardware devices usually pre-determine a power adjustment table (lookup table) to correspond the theoretical power values with the actual hardware parameters. The table lists the corresponding relationships between different theoretical power values and the corresponding actual control parameters (such as amplifier gain, voltage, etc.). In this application, after obtaining the target power gain corresponding to the first OFDM symbol, the corresponding actual parameter value can be found in the table according to the target power gain and transmitted to the hardware device to achieve precise power control of the useful part of the first OFDM symbol.
[0048] An embodiment of the present application proposes a power control method for OFDM symbols. The method includes: obtaining a first initial power gain corresponding to a first orthogonal frequency division multiplexing (OFDM) symbol; obtaining power-related parameters corresponding to a second OFDM symbol, where the second OFDM symbol is the previous OFDM symbol adjacent to the first OFDM symbol; obtaining a predicted power parameter corresponding to the first OFDM symbol based on the power-related parameters corresponding to the second OFDM symbol; generating a target power gain corresponding to the first OFDM symbol based on the predicted power parameter and the first initial power gain, and performing power control on the first OFDM symbol based on the target power gain. By predicting based on adjacent OFDM symbols, the present application reduces the dependence on real-time channel state information, simplifies the power control algorithm, reduces the computational complexity and processing delay, and through more stable power control, can reduce the system performance fluctuation caused by power fluctuation, which helps to optimize the transmission quality and improve the stability and reliability of the system.
[0049] Figure 4 is a schematic diagram of an exemplary embodiment of a power control method for OFDM symbols shown in the present application, as Figure 4 shown, the power control method for OFDM symbols includes the following steps:
[0050] S401, obtaining a first initial power gain corresponding to a first orthogonal frequency division multiplexing (OFDM) symbol.
[0051] Performing point sampling on the cyclic prefix of the first OFDM symbol to obtain a sample point sequence, obtaining the sample point power corresponding to the first OFDM symbol based on each complex sample point in the sample point sequence, and denoting the sample point power as P1. The calculation formula of P1 is:
[0052]
[0053] In the above formula, P1 represents the sample point power corresponding to the first OFDM symbol, N1 represents the number of complex sample points, and x(n) represents the complex sample point.
[0054] Obtaining the target power P that the first OFDM symbol is to reach target . Among them, the target power P that the first OFDM symbol is to reach target is set in advance, and the target power values of all OFDM symbols are the same. The typical empirical value of the target power P target is about 12 - 26 dB down from the maximum power.
[0055] After obtaining the sample point power corresponding to the first OFDM symbol and the target power that the first OFDM symbol is to reach, obtaining the difference between the target power and the sample point power, and using the difference as the first initial power gain corresponding to the first OFDM symbol. The calculation formula of the first initial power gain is:
[0056] Gain1 = P target -P1
[0057] In the above formula, Gain1 represents the first initial power gain corresponding to the first OFDM symbol, P target represents the target power of the first OFDM symbol, and P1 represents the sample point power corresponding to the first OFDM symbol.
[0058] S402. Obtain the power-related parameters corresponding to the second OFDM symbol, where the second OFDM symbol is the previous OFDM symbol adjacent to the first OFDM symbol, and the power-related parameters corresponding to the second OFDM symbol include a second initial power gain and a second power variance.
[0059] Denote the second initial power gain corresponding to the second OFDM symbol as Gain0. The calculation method of the second initial power gain corresponding to the second OFDM symbol is the same as that of the first initial power gain corresponding to the first OFDM symbol, and will not be elaborated here.
[0060] Denote the second power variance corresponding to the second OFDM symbol as
[0061] S403. Obtain the power adjustment coefficient corresponding to the first OFDM symbol.
[0062] Denote the power adjustment coefficient corresponding to the first OFDM symbol as A0.
[0063] Among them, the initial value of A0 is 1, that is, the value of the power adjustment coefficient A0 corresponding to the first OFDM symbol received by the receiving end is 1.
[0064] S404. Obtain the predicted power gain corresponding to the first OFDM symbol based on the power adjustment coefficient and the second initial power gain.
[0065] Among them, the calculation formula for the predicted power gain corresponding to the first OFDM symbol is:
[0066] Gain 01 = A0 * Gain0
[0067] In the above formula, Gain 01 represents the predicted power gain corresponding to the first OFDM symbol, A0 represents the power adjustment coefficient corresponding to the first OFDM symbol, and Gain0 represents the second initial power gain corresponding to the second OFDM symbol.
[0068] S405. Obtain the predicted power variance corresponding to the first OFDM symbol based on the power adjustment coefficient and the second power variance.
[0069] Among them, the calculation formula for the predicted power variance corresponding to the first OFDM symbol is:
[0070]
[0071] In the above formula, represents the predicted power variance corresponding to the first OFDM symbol, A0 represents the power adjustment coefficient corresponding to the first OFDM symbol, represents the second power variance corresponding to the second OFDM symbol.
[0072] S406. Compose a predicted power parameter based on the predicted power gain and the predicted power variance.
[0073] S407. Obtain the reference variance corresponding to the first OFDM symbol.
[0074] Figure 5 is a schematic diagram showing the relationship between an OFDM symbol and a symbol period in the present application. As Figure 5 shown, each symbol period includes multiple OFDM symbols. At the same time, the number of OFDM symbols included in each symbol period is the same. Figure 5 It is illustrated by taking 140 OFDM symbols included in each symbol period.
[0075] In the present application, when obtaining the reference variance corresponding to the first OFDM symbol, it is first necessary to obtain the target symbol period in which the first OFDM symbol is located, and obtain the reference variance corresponding to the target symbol period as the reference variance corresponding to the first OFDM symbol. In the present application, the reference variance corresponding to the first OFDM symbol is denoted as
[0076] It is not difficult to understand that the target symbol period includes multiple OFDM symbols, and the reference variances of these multiple OFDM symbols are the same.
[0077] Among them, the method for obtaining the reference variance corresponding to the target symbol period includes: obtaining the sample point powers of the multiple OFDM symbols included in the previous symbol period adjacent to the target symbol period; generating the reference variance corresponding to the target symbol period based on the sample point powers of the multiple OFDM symbols included in the previous symbol period.
[0078] Exemplarily, taking 140 OFDM symbols included in each symbol period as an example, if the first OFDM symbol is located in the 8th symbol period, the reference variance corresponding to the 8th symbol period is generated based on the sample point powers of the 140 OFDM symbols included in the 7th symbol period. Among them, the reference variance corresponding to the 8th symbol period is also used as the reference variance of the 140 OFDM symbols included in the 8th symbol period.
[0079] S408. Obtain the gain coefficient corresponding to the first OFDM symbol based on the predicted power variance and the reference variance corresponding to the first OFDM symbol.
[0080] The calculation formula for the gain coefficient corresponding to the first OFDM symbol is:
[0081]
[0082] In the above formula, K1 represents the gain coefficient corresponding to the first OFDM symbol, represents the predicted power variance corresponding to the first OFDM symbol, represents the reference variance corresponding to the first OFDM symbol.
[0083] S409. Generate the target power gain corresponding to the first OFDM symbol based on the predicted power gain, the gain coefficient, and the first initial power gain corresponding to the first OFDM symbol.
[0084] The calculation formula for the target power gain corresponding to the first OFDM symbol is:
[0085] Gain = Gain 01 + K1(Gain1 - Gain 01 )
[0086] In the above formula, Gain represents the target power gain corresponding to the first OFDM symbol, Gain 01 represents the predicted power gain corresponding to the first OFDM symbol, K1 represents the gain coefficient corresponding to the first OFDM symbol, and Gain1 represents the first initial power gain corresponding to the first OFDM symbol.
[0087] S410. Perform power control on the first OFDM symbol based on the target power gain.
[0088] In some scenarios where precise power control is required, hardware devices usually pre - formulate a power adjustment table (lookup table) to map theoretical power values to actual hardware parameters. The table lists the corresponding relationships between different theoretical power values and the corresponding actual control parameters (such as amplifier gain, voltage, etc.). In this application, after obtaining the target power gain corresponding to the first OFDM symbol, the corresponding actual parameter value can be looked up in the table according to the target power gain and transmitted to the hardware device to achieve precise power control of the useful part of the first OFDM symbol.
[0089] In the embodiments of the present application, by predicting based on adjacent OFDM symbols, the dependence on real-time channel state information is reduced, the power control algorithm is simplified, the computational complexity and processing delay are lowered. Through more stable power control, the system performance fluctuations caused by power fluctuations can be reduced, which helps to optimize the transmission quality and improve the stability and reliability of the system.
[0090] Further, after generating the target power gain corresponding to the first OFDM symbol based on the predicted power parameter and the first initial power gain, it further includes: updating the power adjustment coefficient based on the first initial power gain and the second initial power gain, and the update formula is:
[0091] A0 = Gain1 / Gain0
[0092] In the above formula, Gain1 represents the first initial power gain corresponding to the first OFDM symbol, and Gain0 represents the second initial power gain corresponding to the second OFDM symbol.
[0093] Among them, the updated power adjustment coefficient serves as the power adjustment coefficient corresponding to the third OFDM symbol, where the third OFDM symbol is the next OFDM symbol adjacent to the first OFDM symbol.
[0094] Further, after generating the target power gain corresponding to the first OFDM symbol based on the predicted power parameter and the first initial power gain, it further includes: obtaining the first power variance corresponding to the first OFDM symbol based on the gain coefficient corresponding to the first OFDM symbol and the predicted power variance corresponding to the first OFDM symbol. The calculation formula for the first power variance corresponding to the first OFDM symbol is:
[0095]
[0096] In the above formula, represents the first power variance corresponding to the first OFDM symbol, K1 represents the gain coefficient corresponding to the first OFDM symbol, represents the predicted power variance corresponding to the first OFDM symbol.
[0097] Taking the first power variance corresponding to the first OFDM symbol and the first initial power gain Gain1 as the power-related parameters corresponding to the first OFDM symbol; among them, the power-related parameters corresponding to the first OFDM symbol are used to calculate the target power gain corresponding to the third OFDM symbol.
[0098] In this way, through iterative calculation, the target power gain corresponding to each OFDM symbol can be obtained, thereby realizing the power adjustment of each OFDM symbol.
[0099] Figure 6 This is a schematic diagram of a power control device for an OFDM symbol shown in this application. As Figure 6 shown, the power control device 600 for the OFDM symbol includes a first acquisition module 601, a second acquisition module 602, a third acquisition module 603, and a power control module 604, where:
[0100] The first acquisition module 601 is configured to acquire a first initial power gain corresponding to a first orthogonal frequency division multiplexing (OFDM) symbol.
[0101] The second acquisition module 602 is configured to acquire power-related parameters corresponding to a second OFDM symbol, where the second OFDM symbol is the previous OFDM symbol adjacent to the first OFDM symbol.
[0102] The third acquisition module 603 is configured to acquire a predicted power parameter corresponding to the first OFDM symbol based on the power-related parameters corresponding to the second OFDM symbol.
[0103] The power control module 604 is configured to generate a target power gain corresponding to the first OFDM symbol based on the predicted power parameter and the first initial power gain, and perform power control on the first OFDM symbol based on the target power gain.
[0104] This device reduces the dependence on real-time channel state information through prediction based on adjacent OFDM symbols, simplifies the power control algorithm, reduces the computational complexity and processing delay. Through more stable power control, it can reduce the system performance fluctuations caused by power fluctuations, which helps to optimize the transmission quality and improve the stability and reliability of the system.
[0105] Further, the third acquisition module 603 is further configured to: acquire a power adjustment coefficient corresponding to the first OFDM symbol; acquire a predicted power gain corresponding to the first OFDM symbol based on the power adjustment coefficient and a second initial power gain; acquire a predicted power variance corresponding to the first OFDM symbol based on the power adjustment coefficient and a second power variance; and form a predicted power parameter based on the predicted power gain and the predicted power variance.
[0106] Further, the power control module 604 is further configured to: acquire a reference variance corresponding to the first OFDM symbol; acquire a gain coefficient corresponding to the first OFDM symbol based on the predicted power variance and the reference variance corresponding to the first OFDM symbol; and generate a target power gain corresponding to the first OFDM symbol based on the predicted power gain, the gain coefficient, and the first initial power gain corresponding to the first OFDM symbol.
[0107] Further, the first acquisition module 601 is further configured to: perform point sampling on the cyclic prefix of the first OFDM symbol to obtain a sample point sequence; obtain the sample point power corresponding to the first OFDM symbol based on each complex sample point in the sample point sequence; obtain the target power of the first OFDM symbol; obtain the difference between the target power and the sample point power, and use the difference as the first initial power gain corresponding to the first OFDM symbol.
[0108] Further, the power control module 604 is further configured to: obtain the target symbol period in which the first OFDM symbol is located, where the target symbol period includes multiple OFDM symbols; obtain the reference variance corresponding to the target symbol period as the reference variance corresponding to the first OFDM symbol.
[0109] Further, the power control module 604 is further configured to: obtain the sample point power of each of the multiple OFDM symbols included in the previous symbol period adjacent to the target symbol period; generate the reference variance corresponding to the target symbol period based on the sample point power of each of the multiple OFDM symbols included in the previous symbol period; where the number of OFDM symbols included in each symbol period is the same.
[0110] Further, the power control module 604 is further configured to: update the power adjustment coefficient based on the first initial power gain and the second initial power gain; where the updated power adjustment coefficient is used as the power adjustment coefficient corresponding to the third OFDM symbol, where the third OFDM symbol is the next OFDM symbol adjacent to the first OFDM symbol.
[0111] Further, the power control module 604 is further configured to: obtain the first power variance corresponding to the first OFDM symbol based on the gain coefficient corresponding to the first OFDM symbol and the predicted power variance corresponding to the first OFDM symbol; use the first power variance corresponding to the first OFDM symbol and the first initial power gain as the power-related parameters corresponding to the first OFDM symbol; where the power-related parameters corresponding to the first OFDM symbol are used to calculate the target power gain corresponding to the third OFDM symbol.
[0112] Figure 7 It is a block diagram of an electronic device 700 shown according to an exemplary embodiment.
[0113] As Figure 7 shown, the above-mentioned electronic device 700 includes:
[0114] A memory 701 and a processor 702, a bus 703 connecting different components (including the memory 701 and the processor 702), and the memory 701 stores a computer program, and when the processor 702 executes the program, it implements the power control method of the OFDM symbol in the embodiments of the present disclosure.
[0115] The bus 703 represents one or more of several types of bus architectures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, or a local bus using any of the various bus architectures. By way of example, these architectures include, but are not limited to, Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MAC) bus, Enhanced ISA bus, Video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus.
[0116] The electronic device 700 typically includes a variety of electronic device-readable media. These media can be any available media that can be accessed by the electronic device 700, including volatile and non-volatile media, removable and non-removable media.
[0117] The memory 701 may also include computer system-readable media in the form of volatile memory, such as random access memory (RAM) 704 and / or cache memory 705. The electronic device 700 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, a storage system 706 can be used for reading from and writing to non-removable, non-volatile magnetic media ( Figure 7 not shown, typically called a "hard disk drive"). Although Figure 7 not shown in the figure, a disk drive for reading from and writing to a removable non-volatile disk (such as a "floppy disk") and an optical disk drive for reading from and writing to a removable non-volatile optical disk (such as a CD-ROM, DVD-ROM, or other optical media) can be provided. In these cases, each drive can be connected to the bus 703 via one or more data media interfaces. The memory 701 may include at least one program product having a set (e.g., at least one) of program modules that are configured to perform the functions of the various embodiments of the present disclosure.
[0118] A program / utility 708 having a set (at least one) of program modules 707 can be stored, for example, in the memory 701. Such program modules 707 include, but are not limited to, an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include an implementation of a network environment. The program modules 707 generally perform the functions and / or methods described in the embodiments of the present disclosure.
[0119] The electronic device 700 can also communicate with one or more external devices 709 (such as a keyboard, a pointing device, a display 710, etc.), and can also communicate with one or more devices that enable a user to interact with the electronic device 700, and / or communicate with any device that enables the electronic device 700 to communicate with one or more other computing devices (such as a network card, a modem, etc.). Such communication can be carried out through the input / output (I / O) interface 711. Moreover, the electronic device 700 can also communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) through the network adapter 712. As Figure 7 shown, the network adapter 712 communicates with other modules of the electronic device 700 through the bus 703. It should be understood that although Figure 7 not shown in the figure, other hardware and / or software modules can be used in combination with the electronic device 700, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, etc.
[0120] The processor 702 executes various functional applications and data processing by running programs stored in the memory 701.
[0121] It should be noted that for the implementation process and technical principle of the electronic device in this embodiment, refer to the foregoing explanation of the power control method of the OFDM symbol in the embodiments of the present disclosure, which will not be elaborated here.
[0122] To implement the above embodiments, the embodiments of the present application also propose a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to enable a computer to implement the power control method of the OFDM symbol as shown in the above embodiments. Optionally, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device, etc.
[0123] To implement the above embodiments, the embodiments of the present application also propose a computer program product, including a computer program, and the computer program implements the power control method of the OFDM symbol as shown in the above embodiments when executed by a processor.
[0124] Those skilled in the art will readily think of other implementation manners of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure, which follow the general principles of the present disclosure and include the common general knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and the embodiments are only regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the following claims.
[0125] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.
Claims
1. A power control method for OFDM symbols, characterized in that Including: Obtaining a first initial power gain corresponding to a first orthogonal frequency division multiplexing (OFDM) symbol; Obtaining power-related parameters corresponding to a second OFDM symbol, where the second OFDM symbol is the previous OFDM symbol adjacent to the first OFDM symbol; Obtaining a predicted power parameter corresponding to the first OFDM symbol based on the power-related parameters corresponding to the second OFDM symbol; Generating a target power gain corresponding to the first OFDM symbol based on the predicted power parameter and the first initial power gain, and performing power control on the first OFDM symbol based on the target power gain.
2. The method according to claim 1, wherein The power-related parameters corresponding to the second OFDM symbol include a second initial power gain and a second power variance. Obtaining the predicted power parameter corresponding to the first OFDM symbol based on the power-related parameters corresponding to the second OFDM symbol includes: Obtaining a power adjustment coefficient corresponding to the first OFDM symbol; Obtaining a predicted power gain corresponding to the first OFDM symbol based on the power adjustment coefficient and the second initial power gain; Obtaining a predicted power variance corresponding to the first OFDM symbol based on the power adjustment coefficient and the second power variance; Composing the predicted power parameter based on the predicted power gain and the predicted power variance.
3. The method according to claim 2, wherein Generating the target power gain corresponding to the first OFDM symbol based on the predicted power parameter and the first initial power gain includes: Obtaining a reference variance corresponding to the first OFDM symbol; Obtaining a gain coefficient corresponding to the first OFDM symbol based on the predicted power variance and the reference variance corresponding to the first OFDM symbol; Generating the target power gain corresponding to the first OFDM symbol based on the predicted power gain, the gain coefficient, and the first initial power gain corresponding to the first OFDM symbol.
4. The method according to claim 3, characterized in that Obtaining the first initial power gain corresponding to the first orthogonal frequency division multiplexing (OFDM) symbol includes: Performing point sampling on the cyclic prefix of the first OFDM symbol to obtain a sample point sequence; Obtaining the sample point power corresponding to the first OFDM symbol based on each complex sample point in the sample point sequence; Obtaining the target power of the first OFDM symbol; Obtaining the difference between the target power and the sample point power, and using the difference as the first initial power gain corresponding to the first OFDM symbol.
5. The method according to claim 3 or 4, characterized in that, Obtaining the reference variance corresponding to the first OFDM symbol includes: Obtaining the target symbol period in which the first OFDM symbol is located, where multiple OFDM symbols are included in the target symbol period; Obtaining the reference variance corresponding to the target symbol period as the reference variance corresponding to the first OFDM symbol.
6. The method according to claim 5, characterized in that, The method for obtaining the reference variance corresponding to the target symbol period includes: Obtaining the sample point power of each of the multiple OFDM symbols included in the previous symbol period adjacent to the target symbol period; Generating the reference variance corresponding to the target symbol period based on the sample point power of each of the multiple OFDM symbols included in the previous symbol period. Among them, the number of OFDM symbols included in each symbol period is the same.
7. The method according to claim 6, wherein After generating the target power gain corresponding to the first OFDM symbol based on the predicted power parameter and the first initial power gain, the method further includes: Updating the power adjustment coefficient based on the first initial power gain and the second initial power gain; Wherein, the updated power adjustment coefficient is used as the power adjustment coefficient corresponding to the third OFDM symbol, and the third OFDM symbol is the next OFDM symbol adjacent to the first OFDM symbol.
8. The method according to claim 7, wherein After generating the target power gain corresponding to the first OFDM symbol based on the predicted power parameter and the first initial power gain, the method further includes: Obtaining a first power variance corresponding to the first OFDM symbol based on the gain coefficient corresponding to the first OFDM symbol and the predicted power variance corresponding to the first OFDM symbol; Regarding the first power variance corresponding to the first OFDM symbol and the first initial power gain as the power-related parameters corresponding to the first OFDM symbol; Wherein, the power-related parameters corresponding to the first OFDM symbol are used to calculate the target power gain corresponding to the third OFDM symbol.
9. A power control device for an OFDM symbol, characterized in that, The method includes: A first acquisition module, configured to acquire a first initial power gain corresponding to a first orthogonal frequency division multiplexing (OFDM) symbol; A second acquisition module, configured to acquire power-related parameters corresponding to a second OFDM symbol, where the second OFDM symbol is the previous OFDM symbol adjacent to the first OFDM symbol; A third acquisition module, configured to obtain a predicted power parameter corresponding to the first OFDM symbol based on the power-related parameters corresponding to the second OFDM symbol; A power control module, configured to generate a target power gain corresponding to the first OFDM symbol based on the predicted power parameter and the first initial power gain, and perform power control on the first OFDM symbol based on the target power gain.
10. An electronic device, comprising: At least one processor; And A memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, and when the instructions are executed by the at least one processor, the at least one processor is enabled to execute the method according to any one of claims 1-8.
11. A non-transitory computer-readable storage medium storing computer instructions, wherein, The computer instructions are used to cause the computer to execute the method according to any one of claims 1-8.
12. A computer program product, comprising a computer program, where the computer program, when executed by a processor, implements the steps of the method according to any one of claims 1-8.