CN115102820A - Method for processing signal and related device - Google Patents
Method for processing signal and related device Download PDFInfo
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- CN115102820A CN115102820A CN202210648757.6A CN202210648757A CN115102820A CN 115102820 A CN115102820 A CN 115102820A CN 202210648757 A CN202210648757 A CN 202210648757A CN 115102820 A CN115102820 A CN 115102820A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L27/2607—Cyclic extensions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
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Abstract
The application provides a method for processing a signal and a related device. The method comprises the following steps: generating a first symbol and a second symbol, wherein the first symbol is a symbol before the second symbol, and a cyclic prefix is arranged between the two symbols; performing a windowing operation on the first symbol and the second symbol within the cyclic prefix, respectively, to generate a first windowed portion of the first symbol and a second windowed portion of the second symbol; the signal amplitude of the first windowed portion and/or the signal amplitude of the second windowed portion is adjusted based on comparing the transmit power of the first symbol with the transmit power of the second symbol. The signal amplitudes of the first windowing part and/or the second windowing part are adjusted based on the comparison between the transmission power of the first symbol and the transmission power of the second symbol, so that the signal amplitudes of the first windowing part and the second windowing part are close to each other when the first symbol and the second symbol are transmitted after power adjustment, and the situation that the amplitudes of the symbols are not close to each other when the symbols are transmitted to generate out-of-band interference is avoided.
Description
Technical Field
The present application relates to the field of wireless communication technologies, and in particular, to a method for processing a signal and a related apparatus.
Background
In a wireless communication system, a cyclic prefix may be set between symbols to suppress inter-symbol interference caused by multipath effects of a transmission channel, and time-domain windowing may be performed on the symbols to bring the amplitudes of the symbols close when they are transmitted to reduce out-of-band leakage.
In the prior art, when a symbol is subjected to time domain windowing, symbol signals are saturated, so that the signal amplitude is not close when the symbol is transmitted, and out-of-band interference occurs.
Disclosure of Invention
The application provides a method for processing signals and a related device. Various aspects of embodiments of the present application are described below.
In a first aspect, a method for processing a signal is provided, including: generating a first symbol and a second symbol, wherein the first symbol is a symbol before the second symbol, and a cyclic prefix is arranged between the first symbol and the second symbol; performing a windowing operation on the first symbol and the second symbol within the cyclic prefix to generate a first windowed portion of the first symbol and a second windowed portion of the second symbol, respectively; and adjusting a signal amplitude of the first windowed portion and/or a signal amplitude of the second windowed portion based on comparing a transmit power of the first symbol with a transmit power of the second symbol.
In a second aspect, an apparatus for processing a signal is provided, comprising: a generating module configured to generate a first symbol and a second symbol, wherein the first symbol is a symbol previous to the second symbol, and a cyclic prefix is arranged between the first symbol and the second symbol; a windowing module configured to perform a windowing operation on the first symbol and the second symbol, respectively, within the cyclic prefix to generate a first windowed portion of the first symbol and a second windowed portion of the second symbol; an adjustment module configured to adjust a signal amplitude of the first windowed portion and/or a signal amplitude of the second windowed portion based on comparing a transmit power of the first symbol with a transmit power of the second symbol.
In a third aspect, a baseband chip is provided, including: a memory to store instructions; a processor configured to execute the instructions stored in the memory such that the baseband chip implements the method of the first aspect.
In a fourth aspect, a wireless communications apparatus is provided, the apparatus comprising: a baseband chip according to the third aspect, for outputting a baseband signal; and the radio frequency system is used for carrying out frequency conversion on the baseband signals output by the baseband chip so as to obtain radio frequency signals.
In a fifth aspect, there is provided a computer readable storage medium having stored thereon a processor executable program, which when executed by a processor, causes a computer to perform the method of the first aspect.
In a sixth aspect, there is provided a computer program product comprising executable code that, when executed, is capable of implementing the method of the first aspect.
The method for processing the signal and the related device provided by the embodiment of the application can reduce the signal in the windowing part of the symbol with larger transmission power when the transmission power of the adjacent symbols is different, so that the amplitude of the signal in the windowing parts of the two symbols is close to each other when the symbols are transmitted after different amplitude gains are passed. The problems of signal saturation overflow caused by signal amplification and nonadjusted amplitude during symbol transmission are avoided.
Drawings
Fig. 1 is a schematic diagram of an OFDM communication system according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a process of adding CP to an OFDM symbol according to an embodiment of the present disclosure.
Fig. 3 is a schematic diagram of a symbol processing method according to an embodiment of the present disclosure.
Fig. 4 is a schematic diagram of another symbol processing method according to an embodiment of the present application.
Fig. 5 is a schematic diagram of another symbol processing method according to an embodiment of the present application.
Fig. 6 is a flowchart illustrating a method for processing a signal according to an embodiment of the present disclosure.
Fig. 7 is an implementation of the method for processing signals shown in step S630 in fig. 6.
Fig. 8 is a schematic structural diagram of an apparatus for processing a signal according to an embodiment of the present disclosure.
Fig. 9 is a schematic structural diagram of a baseband chip according to an embodiment of the present application.
Fig. 10 is a schematic structural diagram of a wireless communication device including the baseband chip shown in fig. 9 according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments.
The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a fourth generation fifth (5G) system or a New Radio (NR), a Long Term Evolution (LTE) system, a Frequency Division Duplex (FDD) system, a Time Division Duplex (TDD) system, and the like. The technical scheme provided by the application can also be applied to future communication systems, such as a sixth generation mobile communication system, a satellite communication system and the like.
Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation technique that can divide a channel into a number of orthogonal sub-channels, convert a high-speed data signal into parallel low-speed sub-streams, and modulate the sub-streams on each sub-channel for transmission. The OFDM technology is widely used in a communication system because of its high spectrum utilization.
The OFDM communication system may be a wireless communication system that utilizes OFDM techniques for data transmission and is described below in conjunction with fig. 1. The OFDM communication system shown in fig. 1 may comprise a transmitter 11 and a receiver 12, wherein the transmitter 11 may be configured to convert an input signal into a transmission signal and transmit the transmission signal to the receiver 12. The receiver 12 is operable to receive the channel processed transmitted signal and recover the original input signal therefrom.
The transmitter 11 may include an encoding module, a modulation module, a reference signal generation module, a resource mapping module, an OFDM baseband signal generation module, and a transmitter radio frequency module. In particular, the encoding module may encode the signal into a bitstream. The modulation module performs quadrature amplitude modulation or quadrature phase shift keying modulation on the bit stream, and after the bit stream is processed by the reference signal generation module and the resource mapping module, the OFDM baseband signal generation module may perform inverse fast fourier transform on the signal, convert the frequency domain signal into a time domain signal, and generate an OFDM symbol. The transmitter radio frequency module can perform interpolation filtering, up-conversion, pre-distortion, analog-to-digital conversion and other processing on the OFDM symbol generated by the baseband signal generation module so as to convert the OFDM symbol into an analog signal, and finally, after the power is amplified by the power amplifier, the amplified OFDM signal is sent to the antenna so that the antenna converts the signal into electromagnetic waves and sends the electromagnetic waves outwards.
The receiver 12 may include: the device comprises a receiver radio frequency module, a timing and frequency synchronization module, a reference signal production module, a channel estimation module, a channel equalization module, a demodulation module and a decoding module. Specifically, the receiver rf module may receive the OFDM signal transmitted by the transmitter 11, and convert the analog signal into a digital baseband signal through digital-to-analog conversion. The digital baseband signal passes through a timing and frequency synchronization module, a reference signal production module, a channel estimation module and an equalization module to obtain an OFDM signal, the OFDM signal is demodulated through fast Fourier transform, and an original bit stream is obtained through restoration by a decoding module.
In order to suppress the problem of inter-OFDM-symbol signal interference caused by the multipath effect of the transmission channel, when the transmitting-end OFDM baseband signal generation module generates an OFDM symbol, a guard time interval is added to the OFDM symbol, and the guard time interval can suppress the problem of inter-symbol signal interference caused by delay. The guard interval may be, for example, a blank period of time loaded in front of the OFDM symbol, and may also be, for example, a Cyclic Prefix (CP). Existing OFDM communication systems such as 4G LTE and 5G NR both use CP-OFDM modulation.
The CP can copy part of signals behind the OFDM symbol to the front of the symbol to form a guard time interval, thus not only avoiding the problem of signal interference caused by multipath effect, but also ensuring the orthogonality of multiple carriers in the OFDM symbol and reducing the mutual interference among the multiple carriers in the OFDM symbol. However, the introduction of the CP breaks the continuity of amplitude and phase between OFDM symbols, so that the inter-symbol signal amplitude is not close. The signal in the OFDM symbol is leaked in the frequency domain, and out-of-band interference is generated, which causes interference to other signals outside the signal bandwidth.
One possible way to address the above problem is to perform time-domain windowing on the OFDM symbols to avoid out-of-band interference introduced after the symbols are added with the CP. Specifically, time domain windowing can be performed on signals in the CP between the OFDM symbols, so that the amplitudes of the signals in the CP of two adjacent symbols are close to each other and the phases are continuous, thereby avoiding abrupt changes of the amplitudes and the phases of the signals, and reducing out-of-band leakage.
The process of OFDM symbol plus CP and time domain windowing is illustratively described below in conjunction with fig. 2. In some embodiments, the OFDM symbol plus CP and time domain windowing processes shown in fig. 2 may be performed at the time of baseband signal generation.
Part (a) of fig. 2 shows two adjacent OFDM symbols, which may be referred to as a first symbol and a second symbol, wherein the first symbol may be a symbol before the second symbol. Part (b) of fig. 2 shows the first symbol and the second symbol after the CP is added. As mentioned above, the partial signals after the respective OFDM symbols may be copied to the front of the symbols to form CP1 and CP 2. To avoid the first and second symbols after CP addition being non-contiguous in amplitude and phase, a time domain windowing process may be performed at CP2 between the first and second symbols. Part (c) in fig. 2 is the first symbol and the second symbol after the time domain windowing process. In some cases, the starting positions of the first symbol and the second symbol need to be processed, for example, the starting positions of the symbols need to be adjusted in order to obtain a better Error Vector Magnitude (EVM) at the signal receiving end. Part (d) in fig. 2 shows the OFDM symbol after the adjustment. It can be seen that the adjustment shown in part (d) of fig. 2 is performed by moving the boundary position of the first symbol and the second symbol to the middle position of the CP2, and adjusting the start position of the first symbol and the end position of the second symbol. It should be understood that the adjustment manner of the symbol starting position in the present application is only an example, and the present application does not limit the adjustment manner of the symbol starting position, and the adjustment of the symbol may be performed according to different strategies. As shown in part (d) of fig. 2, CP2 includes a first windowed portion and a second windowed portion, wherein the first windowed portion belongs to a first symbol, the second windowed portion belongs to a second symbol, and the signal amplitudes of the first windowed portion and the second windowed portion are nearly continuous in phase.
In some cases, the transmit power of different symbols may be different, e.g., the transmit power of the first symbol and the second symbol in fig. 2 may be different. In order to satisfy different transmission powers, the symbol may be amplified to different degrees, for example, a power amplifier may be used to amplify the symbol as needed, and for example, the symbol may be amplified layer by layer in multiple stages until the power when the symbol is transmitted reaches a preset transmission power. After the symbol is amplified, the amplitude of the symbol is also amplified, and if the transmission power of different symbols is different, the gain of the amplified amplitude of the symbol is also different. Taking the first symbol and the second symbol shown in fig. 2 as an example, the first symbol and the second symbol may be amplified before the symbols are transmitted to achieve the required transmission power. If the transmission power of the first symbol is larger than that of the second symbol, the amplitude gain of the first symbol is larger than that of the second symbol; if the transmit power of the first symbol is less than the transmit power of the second symbol, the amplitude gain of the first symbol will be less than the amplitude gain of the second symbol. The adjacent symbols are amplified to different degrees, so that two adjacent symbols with continuous amplitudes close to the phase after time domain windowing treatment can reappear with non-approximate amplitudes, and out-of-band interference is generated. For example, in fig. 2, the first symbol and the second symbol, which are consecutive in CP2, are amplified to different degrees and disconnected in amplitude, thereby generating out-of-band interference.
In order to solve the above problem, one possible way is to pre-process two adjacent symbols during the time-domain windowing of the baseband signal. For example, the signal may be reduced or amplified in the baseband in advance under the scenario that the powers of two adjacent symbols are different, so as to achieve the effect that the symbol amplitude is close to phase continuity after the post-amplification. Two symbol processing methods provided by the embodiments of the present application are exemplarily described below with reference to fig. 3 and 4.
Referring to fig. 3, the transmission power of the first symbol and the transmission power of the second symbol are different, specifically, the transmission power of the first symbol is greater than that of the second symbol, and after the first symbol is amplified by the subsequent stage, the amplitude gain1 of the first symbol is greater than the amplitude gain2 of the second symbol, that is, gain1/gain2 > 1. The processing method shown in fig. 3 is to pre-scale down the signal in the first windowed portion of the first symbol. As in fig. 3(a), the AO of the first windowed section is compressed to AO' in the first section. Thus, after the first symbol and the second symbol are amplified by different amplitude gains, the amplitude is close to the phase and continuous. As in FIG. 3(b), AO' C in the first windowed portion is contiguous with BOD in the second windowed portion upon magnification.
Fig. 4 shows that the transmission power of the first symbol is smaller than the second transmission power, and after the amplification of the later stage, the amplitude gain1 of the first symbol is smaller than the amplitude gain2 of the second symbol, i.e. gain1/gain2 is smaller than 1. The processing method shown in fig. 4 is to amplify the signal in the first windowed portion of the first symbol in advance, and as in fig. 4(a), amplify AO of the first windowed portion to AO "in the first portion. Thus, after the first symbol and the second symbol are amplified by different amplitude gains, the amplitude is close to the phase and continuous. As in FIG. 4(b), AO "C in the first windowed portion is contiguous with BOD in the second windowed portion upon magnification.
It can be seen that the baseband signal processing method shown in fig. 3 and 4 is to perform pre-reduction or pre-amplification on one symbol of two adjacent symbols as a reference symbol, and perform pre-reduction or pre-amplification on the other symbol during generation of the baseband signal. For example, the signal of the first symbol before is pre-reduced or pre-amplified with the second symbol after as a reference symbol. However, in practical engineering implementations, the baseband conventionally uses fixed-point computations, and the baseband signal has been quantized to the appropriate bit-width precision before CP and time-domain windowing are applied. If the baseband signal is amplified again, especially under the condition that the power difference of adjacent symbols is large, the condition that partial signals are saturated and overflowed occurs with high probability, so that the aim that the amplitude is close to the amplitude after the subsequent amplification can not be achieved, and the interference of the baseband signal is generated. Taking the example of the symbol processing method shown in fig. 5 as an example, the AO in the first windowing portion of the first symbol needs to be amplified to AO 'to achieve that the amplitude of the first windowing portion is close to that of the second windowing portion after the post-amplification, however, amplifying AO to AO' may cause signal saturation overflow, and because the signal is already saturated, AO may only be amplified to AO ″. Resulting in discontinuity of the first windowed portion AO "C with the second windowed portion BO' D after the subsequent amplification, as shown in fig. 5 (b).
In order to solve the above problem, the present application provides a method for processing a signal and a related apparatus. Fig. 6 is a flowchart illustrating a method for processing a signal according to an embodiment of the present disclosure.
In step S610, a first symbol and a second symbol are generated, where the first symbol is a symbol previous to the second symbol, and a cyclic prefix is disposed between the first symbol and the second symbol.
The first symbol may be a first OFDM symbol and the second symbol may be a second OFDM symbol.
The first symbol and the second symbol may be two adjacent symbols, wherein the first symbol may be a symbol previous to the second symbol. A CP is arranged between the first symbol and the second symbol.
In some embodiments, adjacent and consecutive first and second symbols may be generated, in other words, first and second symbols of close amplitude may be generated. In this way, the quantization noise of different symbols can be made the same.
In step S620, a windowing operation is performed on the first symbol and the second symbol within the cyclic prefix, respectively, to generate a first windowed portion of the first symbol and a second windowed portion of the second symbol.
Windowing is performed within the CP on the first symbol and the second symbol, respectively. The CP may include a first windowed portion belonging to the first symbol and a second windowed portion belonging to the second symbol.
In step S630, the signal amplitude of the first windowed portion and/or the signal amplitude of the second windowed portion is adjusted based on comparing the transmit power of the first symbol with the transmit power of the second symbol.
The transmission power of the first symbol may be greater than that of the second symbol, and the transmission power of the first symbol may be less than that of the second symbol. In some embodiments, the transmit power of the first symbol and the second symbol may be determined according to power control information carried in a physical downlink control channel.
And if the transmission power of the first symbol is larger than that of the second symbol, reducing the signal amplitude in the first windowing part, so that the signal amplitudes of the first windowing part and the second windowing part are close to each other when the first symbol and the second symbol are transmitted after the first windowing part and the second windowing part are subjected to power adjustment.
The different transmission power among the symbols causes the amplitude gain of the first symbol and the amplitude gain of the second symbol during transmission to be different, if the transmission power of the first symbol is greater than the transmission power of the second symbol, the amplitude gain of the first symbol during transmission is greater than the amplitude gain of the second symbol during transmission, in other words, after the two symbols are subjected to different degrees of power amplification, the amplitude gain of the first symbol is greater than the amplitude gain of the second symbol during symbol transmission.
In this case, the first symbol with large transmission power may be processed, and specifically, the signal amplitude of the first windowed portion of the first symbol may be reduced. Because the amplitude gain of the first symbol is greater than the second amplitude gain, the signal with the previously reduced amplitude in the first windowing portion can be close to the signal with the smaller amplitude gain in the second windowing portion after being amplified by the larger amplitude gain, so that the signal amplitudes of the first windowing portion and the second windowing portion are close to each other during transmission.
When the signal amplitude in the first windowed portion of the first symbol is reduced, the entire signal amplitude in the first windowed portion may be reduced, or a portion of the signal amplitude in the first windowed portion may be reduced. For example, the signal amplitudes of all the sampling points in the first windowed portion may be reduced, for example, the signal amplitudes of some of the sampling points in the first windowed portion may also be reduced, and as an example, the signal amplitude of only the last sampling point in the first windowed portion may be reduced.
The second symbol may be used as a reference symbol when reducing the signal amplitude in the first windowed portion of the first symbol. The signal amplitude in the second windowed portion of the second symbol may remain unchanged. In some embodiments, while reducing the signal amplitude in the first windowed portion of the first symbol, the signal amplitude in the second windowed portion of the second symbol may also be reduced, as one example, the signal amplitude in the second windowed portion may be reduced based on the transmit power of the second symbol.
If the transmission power of the first symbol is less than the transmission power of the second symbol, the signal amplitude of the second windowing part is reduced, so that the signal amplitudes of the first windowing part and the second windowing part are close to each other when the first symbol and the second symbol are transmitted after the first windowing part and the second windowing part are subjected to power adjustment.
If the transmission power of the first symbol is less than that of the second symbol, the gain of the amplitude of the first symbol when transmitting is less than that of the second symbol when transmitting, in other words, the gain of the amplitude of the first symbol is less than that of the second symbol after the two symbols are subjected to different degrees of power amplification.
In this case, the second symbol with large transmission power may be processed, and specifically, the signal amplitude in the second windowing portion of the second symbol may be reduced, and since the amplitude gain of the second symbol is greater than the first amplitude gain, after the signal with the reduced amplitude in advance in the second windowing portion is amplified by a larger amplitude gain, the signal may be close to the signal amplified by a smaller amplitude gain in the first windowing portion, so that the signal amplitudes of the first windowing portion and the second windowing portion are close to each other during transmission.
Likewise, when the signal amplitude in the second windowed portion of the second symbol is reduced, the entire signal amplitude in the second windowed portion may be reduced, or a portion of the signal amplitude in the second windowed portion may be reduced. For example, the signal amplitudes of all the sampling points in the second windowing portion may be reduced, for example, the signal amplitudes of some of the sampling points in the second windowing portion may also be reduced, and as an example, the signal amplitude of only the last sampling point in the second windowing portion may be reduced.
The first symbol may be taken as a reference symbol when the signal amplitude in the second windowed portion of the second symbol is reduced. The signal amplitude in the first windowed portion of the first symbol may remain unchanged. The signal amplitude in the first windowed portion of the first symbol may also be reduced, as an example, based on the transmit power of the first symbol.
Therefore, the method for processing the signal provided by the embodiment of the application can always reduce the signal amplitude in the windowing part of the symbol with larger transmission power when the transmission power of the adjacent symbols is different, so that after different amplitude gains are used, the signal amplitudes of the first windowing part and the second windowing part in the CP between two symbols are close to each other when the symbols are transmitted. During signal processing, the signal amplitude of the windowing part of the symbol is not required to be amplified, so that the problems of signal saturation overflow caused by signal amplitude amplification and nonadjacent amplitude during symbol transmission are avoided.
In some embodiments, the signal amplitude may be the amplitude of the signal, the signal amplitude of the first windowed portion of the first symbol may be the amplitude of the signal in the first windowed portion, and the signal amplitude of the second windowed portion of the second symbol may be the amplitude of the signal in the second windowed portion.
Reference to "close" in the practice of this application is to be understood as meaning that the amplitude variation between the signal in the first windowed portion of the first symbol and the signal in the second windowed portion of the second symbol is within a small range, i.e. the amplitude is continuous over a small range of amplitude variations. If a jump in amplitude occurs between the signal of the first windowed portion and the signal of the second windowed portion, it is said that the amplitude is not close, i.e. the signal amplitude is not continuous.
In some embodiments, the signal amplitude of the first windowed portion and/or the second windowed portion may be reduced by reducing the windowing coefficients. In some embodiments, the windowing coefficient for the first windowed portion may be reduced if the transmit power of the first symbol is greater than the transmit power of the second symbol; the windowing coefficient for the second windowed portion may be reduced if the transmit power of the first symbol is less than the transmit power of the second symbol. In other embodiments, the windowing coefficients of the first windowed portion may be reduced when the amplitude of the signal in the first windowed portion is reduced, and the amplitude of the signal in the second windowed portion may be directly reduced when the amplitude of the signal in the second windowed portion is reduced. In other embodiments, the windowing coefficients of the second windowed portion may be reduced when the amplitude of the signal in the second windowed portion is reduced, and the amplitude of the signal in the first windowed portion may be directly reduced when the amplitude of the signal in the first windowed portion is reduced.
When the windowing coefficients of the windowing portions are reduced, the windowing coefficients of all signal sampling points in the first and/or second windowing portions can be reduced, and the windowing coefficients of some signal sampling points in the first and/or second windowing portions can also be reduced.
In some embodiments, the proportion of the reduction of the windowing coefficient of the windowed portion may be determined based on the difference between the transmit powers of two adjacent symbols. As one possible implementation, the transmit power of the first symbol may be P1 and the transmit power of the second symbol may be P2. If the transmission power P1 of the first symbol is greater than the transmission power P2 of the second symbol, an exponential power calculation can be performed on the difference P1-P2 between the transmission power P1 of the first symbol and the transmission power P2 of the second symbol, and the ratio of the amplitude gain when the first symbol is transmitted to the amplitude gain when the second symbol is transmitted is calculated. As one example, the ratio of the amplitude gain at transmission of the first symbol to the amplitude gain at transmission of the second symbol
The windowing coefficient of the first windowed portion of the first symbol may be scaled down based on the ratio of the amplitude gain, as an example, the windowing coefficient of the first windowed portion is the original windowing coefficient/amplitude gain ratio of the first windowed portion. If the transmission power P1 of the first symbol is greater than the transmission power P2 of the second symbol, a difference P1-P2 between the transmission power P1 of the first symbol and the transmission power P2 of the second symbol can be madeAnd performing exponential power calculation to calculate the ratio of the amplitude gain when the first symbol is transmitted to the amplitude gain when the second symbol is transmitted. As one example, the ratio of the amplitude gain at transmission of the first symbol to the amplitude gain at transmission of the second symbol
The windowing coefficients of the second windowed portion of the second sign may be scaled down based on the ratio of the amplitude gain, as an example, the windowing coefficients of the second windowed portion is the original windowing coefficients of the second windowed portion.
In some embodiments, the transmit power of a symbol may be represented by an amplitude gain at the time of transmission of the symbol, and in particular, the transmit power of a symbol may be represented by an amplitude gain after the symbol has passed through a power amplifier. The transmission power of the first symbol may be represented by an amplitude gain of the first symbol after passing through the power amplifier, and the transmission power of the second symbol may be represented by an amplitude gain of the second symbol after passing through the power amplifier.
Fig. 7 is a method for processing a signal provided in this application, where fig. 7 may be an implementation manner of step S630 in fig. 6, and the method for processing a signal provided in this application is described below with reference to fig. 7.
Fig. 7 shows that the transmit power of a first symbol is less than the transmit power of a second symbol, which are adjacent symbols that are generated with close, i.e., continuous, amplitudes. The power difference between the symbols is fed back to the amplitude gain in the later stages. The first symbol has an amplitude gain of gain1 when transmitted, and the second symbol has an amplitude gain of gain2 when transmitted, with gain1 being greater than gain 2. The windowing coefficients of the signal in the second windowed portion of the second symbol may be reduced to reduce the signal amplitude in the second windowed portion. As shown in FIG. 7(a), OB and OD in the second symbol can be reduced to O 'B and O' D according to the gain ratio gain1/gain2 of the two symbols. The goal of window coefficient reduction is that two symbol-adjacent samples approach in magnitude after different gains. After the window coefficient of the second windowing part is reduced, the windowed signal is seen to be discontinuous on the baseband side, and finally after the subsequent amplification, when two symbols reach the expected power respectively, the amplitudes of the two symbols are close to continuous phases, so that the time domain signal becomes continuous. As shown in fig. 7(b), after the post-amplification, the first windowed portion AOC of the first symbol is continuous with the second windowed portion BO' D of the second symbol.
In some embodiments, a windowing operation may be performed on the first symbol and the second symbol within the inter-symbol CP, respectively, using a windowing function to form a first windowed portion of the first symbol and a second windowed portion of the second symbol. It should be appreciated that the application is not limited to the type of window function, and the window function may be any design of window function capable of operating, and as an example, the window function may be one of a triangular window, a hamming window, and a hanning window.
It can be seen that, in the method for processing a signal provided in the embodiment of the present application, by selecting a symbol with large transmission power or large amplitude gain at a later stage, when CP windowing is performed on a baseband in advance, amplitude reduction is performed on a signal with large power in advance according to a power difference, so that a problem of saturation of a baseband signal after time domain windowing in a predistortion processing scheme is solved.
Method embodiments of the present application are described in detail above in conjunction with fig. 1-7, and apparatus embodiments of the present application are described in detail below in conjunction with fig. 8 and 10. It is to be understood that the description of the method embodiments corresponds to the description of the apparatus embodiments, and therefore reference may be made to the preceding method embodiments for parts not described in detail.
Fig. 8 is a schematic structural diagram of an apparatus for processing a signal according to an embodiment of the present disclosure, and the apparatus 800 for processing a signal shown in fig. 8 may include a generating module 810, a windowing module 820, and an adjusting module 830.
A generating module 810 configured to generate a first symbol and a second symbol, wherein the first symbol is a symbol previous to the second symbol, and a cyclic prefix is arranged between the first symbol and the second symbol;
a windowing module 820 configured to perform a windowing operation on the first symbol and the second symbol within the cyclic prefix to generate a first windowed portion of the first symbol and a second windowed portion of the second symbol, respectively;
an adjusting module 830 configured to adjust a signal amplitude of the first windowed portion and/or a signal amplitude of the second windowed portion based on comparing a transmit power of the first symbol with a transmit power of the second symbol.
Optionally, the adjusting module 830 is further configured to: reducing the signal amplitude in the first windowed portion; and/or, reducing the signal amplitude in the second windowed portion.
Optionally, the adjusting module 830 is further configured to: adjusting a signal amplitude of the first windowed portion and/or a signal amplitude of the second windowed portion such that the first windowed portion and the second windowed portion are close in signal amplitude after being power adjusted.
Optionally, the adjusting module 830 is further configured to: reducing the windowing coefficient of the first windowed portion; and/or reducing the windowing coefficient of the second windowed portion.
Optionally, the adjusting module 830 is further configured to: determining a reduction ratio of a windowing coefficient of the first windowed portion based on a difference between a transmit power of the first symbol and a transmit power of the second symbol; and/or determining a reduction ratio of a windowing coefficient of the second windowed portion based on a difference between a transmit power of the first symbol and a transmit power of the second symbol.
Fig. 9 is a schematic structural diagram of a baseband chip according to an embodiment of the present disclosure, where the baseband chip 900 shown in fig. 9 may include a memory 910 for storing instructions, and a processor 920 for executing the instructions stored in the memory 910 to perform the steps in the methods described above.
Fig. 10 is a schematic structural diagram of a wireless communication device according to an embodiment of the present disclosure, where the wireless communication device 1000 shown in fig. 10 may include a baseband chip 900 shown in fig. 9, and a radio frequency system 1010 for performing frequency conversion on a baseband signal output by the baseband chip 900 to obtain a radio frequency signal.
It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship.
It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of the processes should be determined by the functions and the inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical functional division, and in actual implementation, there may be other divisions, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
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, that is, may be located in one place, or may also be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions described in accordance with the embodiments of the application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be read by a computer or a data storage device, such as a server, a data center, etc., that is integrated with one or more available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a Digital Versatile Disk (DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), among others.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (15)
1. A method of processing a signal, comprising:
generating a first symbol and a second symbol, wherein the first symbol is a symbol before the second symbol, and a cyclic prefix is arranged between the first symbol and the second symbol;
performing a windowing operation on the first symbol and the second symbol within the cyclic prefix, respectively, to generate a first windowed portion of the first symbol and a second windowed portion of the second symbol; and
adjusting a signal amplitude of the first windowed portion and/or a signal amplitude of the second windowed portion based on comparing a transmit power of the first symbol to a transmit power of the second symbol.
2. A method according to claim 1, wherein said adjusting the signal amplitude of the first windowed portion and/or the signal amplitude of the second windowed portion comprises:
reducing the signal amplitude in the first windowed portion; and/or
Reducing the signal amplitude in the second windowed portion.
3. The method of claim 1, wherein said adjusting the signal amplitude of the first windowed portion and/or the signal amplitude of the second windowed portion comprises:
adjusting a signal amplitude of the first windowed portion and/or a signal amplitude of the second windowed portion such that the first windowed portion and the second windowed portion are close in signal amplitude after being power adjusted.
4. The method of claim 2, wherein said reducing the signal amplitude in the first windowed portion comprises: reducing the windowing coefficient of the first windowed portion; and/or, said reducing the signal amplitude in said second windowed portion comprises: and reducing the windowing coefficient of the second windowing part.
5. The method of claim 4, wherein the scaling down of the windowing coefficients of the first windowed portion is determined based on a difference between the transmit power of the first symbol and the transmit power of the second symbol; and/or the scaling down of the windowing coefficient of the second windowed portion is determined based on the difference between the transmit power of the first symbol and the transmit power of the second symbol.
6. The method of claim 1, wherein the transmit power of the first symbol is represented by an amplitude gain of the first symbol after amplification by a power amplifier; and/or the transmission power of the second symbol is represented by the amplitude gain of the second symbol after being amplified by a power amplifier.
7. The method of claim 1, wherein the first symbol and the second symbol are both OFDM symbols.
8. An apparatus for processing a signal, comprising:
a generating module configured to generate a first symbol and a second symbol, wherein the first symbol is a symbol previous to the second symbol, and a cyclic prefix is arranged between the first symbol and the second symbol;
a windowing module configured to perform a windowing operation on the first symbol and the second symbol, respectively, within the cyclic prefix to generate a first windowed portion of the first symbol and a second windowed portion of the second symbol;
an adjustment module configured to adjust a signal amplitude of the first windowed portion and/or a signal amplitude of the second windowed portion based on comparing a transmit power of the first symbol with a transmit power of the second symbol.
9. The apparatus of claim 8, wherein the adjustment module is further configured to:
reducing the signal amplitude in the first windowed portion; and/or
Reducing the signal amplitude in the second windowed portion.
10. The apparatus of claim 8, wherein the adjustment module is further configured to:
adjusting a signal amplitude of the first windowed portion and/or a signal amplitude of the second windowed portion such that the first windowed portion and the second windowed portion are close in signal amplitude after being power adjusted.
11. The apparatus of claim 9, wherein the adjustment module is further configured to:
reducing the windowing coefficient of the first windowed portion; and/or the presence of a gas in the atmosphere,
and reducing the windowing coefficient of the second windowing part.
12. The apparatus of claim 11, wherein the adjustment module is further configured to:
determining a reduction ratio of a windowing coefficient of the first windowed portion based on a difference between a transmit power of the first symbol and a transmit power of the second symbol; and/or the presence of a gas in the gas,
determining a reduction ratio of a windowing coefficient of the second windowed portion based on a difference between a transmit power of the first symbol and a transmit power of the second symbol.
13. A baseband chip, comprising:
a memory to store instructions;
a processor to execute instructions stored in the memory to cause the baseband chip to implement the method of any of claims 1-7.
14. An apparatus for wireless communication, the apparatus comprising:
the baseband chip of claim 13, for outputting a baseband signal; and
and the radio frequency system is used for carrying out frequency conversion on the baseband signal output by the baseband chip so as to obtain a radio frequency signal.
15. A computer-readable storage medium, having stored thereon a processor-executable program which, when executed by a processor, causes a computer to perform the method of any one of claims 1-7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210648757.6A CN115102820A (en) | 2022-06-09 | 2022-06-09 | Method for processing signal and related device |
| PCT/CN2022/140113 WO2023236495A1 (en) | 2022-06-09 | 2022-12-19 | Signal processing method and related apparatus |
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| CN202210648757.6A CN115102820A (en) | 2022-06-09 | 2022-06-09 | Method for processing signal and related device |
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| WO2023236495A1 (en) * | 2022-06-09 | 2023-12-14 | Oppo广东移动通信有限公司 | Signal processing method and related apparatus |
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| WO2020069646A1 (en) * | 2018-10-03 | 2020-04-09 | Huawei Technologies Co., Ltd. | Computing cyclic prefix length and receiver windowing length using ingress conditions in an ofdm system |
| CN112804177B (en) * | 2019-11-14 | 2024-01-09 | 深圳市中兴微电子技术有限公司 | OFDM time domain windowing method and device |
| WO2022020993A1 (en) * | 2020-07-27 | 2022-02-03 | 哲库科技(北京)有限公司 | Time-domain windowing method and related product |
| CN112565150B (en) * | 2020-12-11 | 2022-04-08 | 中南民族大学 | Orthogonal windowing orthogonal frequency division multiplexing system, active interference cancellation method and application |
| CN115102820A (en) * | 2022-06-09 | 2022-09-23 | Oppo广东移动通信有限公司 | Method for processing signal and related device |
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| WO2023236495A1 (en) * | 2022-06-09 | 2023-12-14 | Oppo广东移动通信有限公司 | Signal processing method and related apparatus |
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