CN114629514A - Direct current correction method based on channel estimation and zero intermediate frequency receiver - Google Patents
Direct current correction method based on channel estimation and zero intermediate frequency receiver Download PDFInfo
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Abstract
The application discloses a direct current correction method based on channel estimation and a zero intermediate frequency receiver. The direct current correction method based on the channel estimation comprises the following steps: receiving a transmission signal transmitted from a transmitter; acquiring a power time delay spectrum based on the channel multipath response of the transmitted signal; acquiring a frequency domain correlation value sequence according to the power time delay spectrum; determining a frequency domain interpolation coefficient according to the frequency domain correlation value sequence; reconstructing a channel estimation value of the zero frequency position according to the frequency domain interpolation coefficient and the channel estimation value of the adjacent zero frequency position; and carrying out channel equalization on the transmitting signal based on the channel estimation value and the direct current value of the zero frequency position so as to demodulate and recover the original information of the zero frequency position. Therefore, when the transmitter is filled with the direct current subcarrier, the baseband direct current offset can still be effectively eliminated, the channel equalization at the zero frequency position is ensured to be normal, and the problem of saturation overflow of the zero frequency position in the channel equalization when the digital de-direct current is adopted to eliminate the baseband direct current offset is solved.
Description
Technical Field
The present application relates to the field of wireless communication technologies, and in particular, to a direct current correction method based on channel estimation and a zero intermediate frequency receiver.
Background
In recent years, the rapid development of wireless communication technologies such as wireless local area networks, 3G technologies, and bluetooth has promoted further research on integrated wireless receivers in the GHz frequency range. The architecture of wireless receivers based on these wireless communication standards is largely divided into superheterodyne and zero-if. A superheterodyne receiver, which converts a signal frequency band (RF) to a relatively low Intermediate Frequency (IF), filters, amplifies, and converts the IF to a baseband, and finally performs quantization and demodulation, requires off-chip passive devices to implement the intermediate frequency filtering function, but such devices have high power and generate image signals, so that removing the image signals becomes a difficult point that must be overcome in developing a superheterodyne receiver. Because of this, the zero intermediate frequency receiver does not need to pass through the intermediate frequency in the frequency conversion process, and the image frequency is the radio frequency signal itself, there is no image frequency interference, so that the zero intermediate frequency receiver gradually becomes the most widely used receiver structure at present.
However, the zero if receiver introduces baseband during the frequency conversion process, which causes dc offset, and thus reduces the overall dynamic range of the system, so it is necessary to eliminate the baseband dc offset as much as possible. When the zero intermediate frequency receiver adopts a simple analog circuit to remove the direct current technology to eliminate the direct current offset of the baseband, the problem that the direct current offset of the baseband signal is difficult to eliminate completely or the direct current offset is not suitable for realizing the chip level due to the complex circuit exists. Therefore, when a related person develops a zero intermediate frequency receiver, a digital de-dc technique is usually used to eliminate baseband dc offset, but when a transmitter fills data at a dc position, a channel estimation value at a dc subcarrier is seriously affected by the digital de-dc technique, which further affects channel equalization, so that equalization at the dc subcarrier is extremely abnormal, and if the transmitter is a fixed-point system, a very large saturation value occurs, which easily affects normal operation of the system.
Disclosure of Invention
The embodiment of the application provides a direct current correction method based on channel estimation and a zero intermediate frequency receiver, and solves the problem that in the prior art, if a transmitter fills data at a direct current position, a channel estimation value at a direct current subcarrier is seriously influenced, so that channel equalization is influenced.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, a channel estimation-based direct current correction method is provided, which is applied to a zero intermediate frequency receiver. The direct current correction method based on the channel estimation comprises the following steps: receiving a transmission signal transmitted from a transmitter; acquiring a power delay spread (PDP) based on a channel multipath response of the transmitted signal; acquiring a frequency domain correlation value sequence according to the power time delay spectrum; determining a frequency domain interpolation coefficient according to the frequency domain correlation value sequence; reconstructing a channel estimation value of the zero frequency position according to the frequency domain interpolation coefficient and the channel estimation value of the adjacent zero frequency position; and carrying out channel equalization on the transmitting signal based on the channel estimation value and the direct current value of the zero frequency position so as to demodulate and recover the original information of the zero frequency position.
In a second aspect, a zero intermediate frequency receiver is provided, including: the device comprises a receiving module, an obtaining module, a correlation operation module, an estimating module and a balancing module, wherein the obtaining module is connected with the receiving module, the correlation operation module is connected with the obtaining module, the estimating module is connected with the correlation operation module, and the balancing module is connected with the estimating module. The receiving module is used for receiving a transmitting signal transmitted by a transmitter; the acquisition module is used for acquiring a power time delay spectrum based on the channel multipath response of the transmitting signal; the correlation operation module is used for acquiring a frequency domain correlation value sequence according to the power time delay spectrum and determining a frequency domain interpolation coefficient according to the frequency domain correlation value sequence; the estimation module is used for reconstructing the channel estimation value of the zero frequency position according to the frequency domain interpolation coefficient and the channel estimation value of the adjacent zero frequency position; the equalization module is used for carrying out channel equalization on the transmitting signal based on the channel estimation value and the direct current value of the zero frequency position so as to demodulate and recover the original information of the zero frequency position.
In the embodiment of the application, the channel estimation value of the zero-frequency position is restored by a frequency domain correlation method of channel multipath, so that the problem of saturation overflow of the zero-frequency position in channel equalization when baseband direct current offset is eliminated by digital direct current removal is solved; and simultaneously, the original information of the zero-frequency position is completely recovered by using the time-frequency relation and the channel balance of the direct current. Therefore, the embodiment of the application can effectively eliminate the baseband direct current offset while the transmitter fills the direct current subcarriers, and ensure that the channel equalization is normal without any abnormality.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a block diagram of a zero intermediate frequency receiver according to an embodiment of the present application; and
fig. 2 is a flowchart of an embodiment of a dc calibration method based on channel estimation according to the present application.
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 some, but not all, of the embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Because the zero intermediate frequency receiver adopts the digital de-direct current technology to eliminate the baseband direct current offset, which may cause the frequency offset estimation to generate deep notch at the zero frequency position, and further cause the subcarrier at the zero frequency position and the nearby subcarriers to generate saturation overflow, the embodiment of the present application provides a frequency domain correlation principle that the zero intermediate frequency receiver 100 uses channel multipath response to generate, and optimizes the estimation error of the zero frequency position by using the subcarriers around the zero frequency position, and further restores the zero frequency component, so as to optimally protect the channel estimation value at the zero frequency position, and solve the problems existing in the prior art. Detailed descriptionreferring to fig. 1, a block diagram of a zero if receiver according to an embodiment of the present application is shown.
As shown in fig. 1, the zero intermediate frequency receiver 100 includes: the device comprises a receiving module 110, an obtaining module 120, a correlation operation module 130, an estimating module 140 and an equalizing module 150, wherein the obtaining module 120 is connected with the receiving module 110, the correlation operation module 130 is connected with the obtaining module 120, the estimating module 140 is connected with the correlation operation module 130, and the equalizing module 150 is connected with the estimating module 140. The receiving module 110 may be, but is not limited to, an antenna; the obtaining module 120, the correlation module 130, the estimation module 140, and the equalization module 150 may be generated by one or more processors executing a specific program loaded into one or more storage modules, or may be included in one or more processors, which may be processing units, microprocessors, or any suitable processing elements; the storage module may include any type of volatile memory (volatile memory) and/or non-volatile memory (non-volatile memory), such as: static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Flash memory (Flash), Read Only Memory (ROM), and the like; a bus may connect the processor and the memory modules, and may comprise one or more types of buses, such as a data bus (data bus), an address bus (address bus), a control bus (control bus), an expansion bus (expansion bus), and/or a local bus (local bus).
The receiving module 110 may be used to receive a transmitted signal transmitted from a transmitter. The transmission signal may be a signal transmitted by a transmitter for measurement or monitoring purposes in the wireless communication system, and may also be referred to as a reference signal. The receiving module 110 may be, but is not limited to, a plurality of antennas.
The acquisition module 120 may be used to acquire a power delay spectrum based on the channel multipath response of the transmitted signal. Due to the multipath of the mobile communication channel, dispersion is caused in time, frequency and angle, and the power delay spectrum is used for describing the dispersion of the channel in time, namely, the variation relation of power with delay. After the receiving module 110 receives the transmission signal, the obtaining module 120 performs channel estimation on the transmission signal to obtain a channel response of the transmission signal in a frequency domain and a channel response of the transmission signal in a time domain, and further obtains a power delay spectrum based on a channel multipath response of the transmission signal.
The correlation operation module 130 may be configured to obtain a frequency domain correlation value sequence according to the power delay profile, and determine a frequency domain interpolation coefficient according to the frequency domain correlation value sequence. Since the frequency domain correlation is obtained by performing Fast Fourier Transform (FFT) operation on a power delay spectrum in channel estimation, in an embodiment, the correlation operation module 130 may determine a position of an energy maximum path of the transmission signal according to the power delay spectrum, and then perform FFT operation on the power delay spectrum by taking K sampling points before and P sampling points after the power delay spectrum and taking the position of the energy maximum path as a center, so as to obtain the frequency domain correlation value sequence, where K and P are positive integers. The sum of K and P can be a preset value and can be adjusted according to actual requirements.
In an embodiment, the correlation operation module 130 further obtains a frequency domain autocorrelation matrix and a frequency domain cross-correlation matrix according to the frequency domain correlation value sequence; and determining the frequency domain interpolation coefficient according to the frequency domain autocorrelation matrix and the frequency domain cross-correlation matrix. The correlation operation module 130 may obtain the frequency-domain cross-correlation matrix according to the frequency-domain correlation value sequence and the fractional time-delayed sequence thereof. In one embodiment, the correlation operation module 130 calculates an inverse matrix of the frequency-domain autocorrelation matrix and multiplies the frequency-domain cross-correlation matrix by the inverse matrix to obtain the frequency-domain interpolation coefficients. For example, the frequency domain autocorrelation matrix ΦFDEach element of (a) can be expressed according to the following formula,
where R is a mathematical autocorrelation function, N0For pilot spacing, phiFDThe method comprises the steps of obtaining a frequency domain autocorrelation matrix, wherein i is the row number of the frequency domain autocorrelation matrix, and j is the column number of the frequency domain autocorrelation matrix; the frequency domain cross-correlation matrix thetaFDEach element of (a) can be expressed according to the following formula,
wherein the content of the first and second substances,
R(r)for the autocorrelation function, N, on each antenna of the zero intermediate frequency receiver 1000Is pilot spacing, θFDIs a frequency domain cross-correlation matrix, i is the number of rows of the frequency domain cross-correlation matrix, j is the number of columns of the frequency domain cross-correlation matrix,
is the number of pilot frequencies; the frequency domain interpolation coefficient
Can be determined in accordance with the following formula,
the estimation module 140 may be configured to reconstruct a channel estimation value of the zero-frequency position according to the frequency domain interpolation coefficient and the channel estimation value of the adjacent zero-frequency position.
In one embodiment, the estimation module 140 further optimizes the estimation error of the zero-frequency position by using a least square method according to the frequency domain interpolation coefficient and the channel estimation value of the adjacent zero-frequency position to reconstruct the channel estimation value of the zero-frequency position (i.e. restore the channel estimation of the zero-frequency position).
The equalization module 150 may be configured to perform channel equalization on the transmission signal based on the channel estimation value and the dc value at the zero frequency position (i.e., the subcarrier value at the zero frequency position), so as to demodulate and recover the original information at the zero frequency position, thereby protecting the problem of saturation overflow of the zero frequency position in the channel equalization.
Please refer to fig. 2, which is a flowchart illustrating an embodiment of a dc calibration method based on channel estimation according to the present application; the direct current correction method based on channel estimation can be applied to a zero intermediate frequency receiver. As shown in the figure, the channel estimation-based dc correction method may include the following steps: receiving a transmission signal transmitted from a transmitter (step S210); acquiring a power delay spectrum based on a channel multipath response of the transmission signal (step S220); acquiring a frequency domain correlation value sequence according to the power delay spectrum (step S230); determining a frequency domain interpolation coefficient according to the frequency domain correlation value sequence (step S240); reconstructing a channel estimation value of the zero frequency position according to the frequency domain interpolation coefficient and the channel estimation value of the adjacent zero frequency position (step S250); and performing channel equalization on the transmission signal based on the channel estimation value and the direct current value of the zero-frequency position to demodulate and recover original information of the zero-frequency position (step S260).
In an embodiment, the step S230 may include: determining the position of the maximum energy path of the transmitted signal according to the power time delay spectrum; and taking K sampling points in front of the power time delay spectrum and P sampling points behind the power time delay spectrum by taking the position of the maximum energy diameter as a center to perform FFT operation so as to obtain the frequency domain correlation value sequence, wherein K and P are positive integers.
In an embodiment, the step S240 may include: acquiring a frequency domain autocorrelation matrix according to the frequency domain correlation value sequence; acquiring a frequency domain cross-correlation matrix according to the frequency domain correlation value sequence; and determining the frequency domain interpolation coefficient according to the frequency domain autocorrelation matrix and the frequency domain cross-correlation matrix. For example, the determining the frequency-domain interpolation coefficients according to the frequency-domain autocorrelation matrix and the frequency-domain cross-correlation matrix may include: calculating an inverse matrix of the frequency domain autocorrelation matrix; and multiplying the frequency domain cross correlation matrix by the inverse matrix to obtain the frequency domain interpolation coefficient.
In an embodiment, the step S250 may include: and optimizing the estimation error of the zero-frequency position by using LS according to the frequency domain interpolation coefficient and the channel estimation value of the adjacent zero-frequency position so as to reconstruct the channel estimation value of the zero-frequency position.
In summary, the present application provides a direct current correction method based on channel estimation and a zero intermediate frequency receiver, which reduce a channel estimation value of a zero frequency position by a frequency domain correlation method of channel multipath, thereby solving the problem of saturation overflow of the zero frequency position in channel equalization when a digital de-dc is used to eliminate baseband direct current offset; and simultaneously, the original information of the zero-frequency position is completely recovered by using the time-frequency relation and the channel balance of the direct current. Therefore, the embodiment of the application can effectively eliminate the baseband direct current offset while the transmitter fills the direct current subcarriers, and ensure that the channel equalization is normal without any abnormality.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The use of words such as "first," "second," "third," etc. herein is used to modify a claimed element and is not intended to imply a priority order, precedence relationship, or order between elements or steps of a method or process.
It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is described as being "directly connected" or "directly coupled" to another element, there are no intervening elements present. In addition, any reference to singular is intended to include the plural unless the specification specifically states otherwise.
All or a portion of the steps of the methods described herein may be implemented in a computer program, such as the operating system of a computer, a driver for specific hardware in a computer, or a software program. In addition, other types of programs, as shown above, may also be implemented. The method of the embodiments of the present application can be written as a computer program by those skilled in the art, and will not be described again for the sake of brevity. The computer program implemented according to the embodiments of the present application may be stored on a suitable computer readable medium, such as a DVD, a CD-ROM, a USB, a hard disk, or may be located on a network server accessible via a network (e.g., the internet, or other suitable carrier).
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A direct current correction method based on channel estimation is applied to a zero intermediate frequency receiver and is characterized by comprising the following steps:
receiving a transmission signal transmitted from a transmitter;
acquiring a power delay spread (PDP) based on a channel multipath response of the transmitted signal;
acquiring a frequency domain correlation value sequence according to the power time delay spectrum;
determining a frequency domain interpolation coefficient according to the frequency domain correlation value sequence;
reconstructing a channel estimation value of the zero frequency position according to the frequency domain interpolation coefficient and the channel estimation value of the adjacent zero frequency position;
and carrying out channel equalization on the transmitting signal based on the channel estimation value and the direct current value of the zero frequency position so as to demodulate and recover the original information of the zero frequency position.
2. The channel estimation-based direct current correction method according to claim 1, wherein the obtaining a sequence of frequency-domain correlation values according to the power-delay profile comprises:
determining the position of the maximum energy path of the transmitted signal according to the power time delay spectrum;
taking K sampling points in front of the power time delay spectrum and P sampling points behind the power time delay spectrum by taking the position of the maximum energy diameter as a center, and performing Fast Fourier Transform (FFT) operation to obtain the frequency domain correlation value sequence, wherein K and P are positive integers.
3. The channel estimation-based direct current correction method as claimed in claim 1, wherein said determining frequency domain interpolation coefficients from said sequence of frequency domain correlation values comprises:
acquiring a frequency domain autocorrelation matrix according to the frequency domain correlation value sequence;
acquiring a frequency domain cross-correlation matrix according to the frequency domain correlation value sequence;
and determining the frequency domain interpolation coefficient according to the frequency domain autocorrelation matrix and the frequency domain cross-correlation matrix.
4. The channel estimation-based direct current correction method as claimed in claim 3, wherein said determining the frequency domain interpolation coefficients according to the frequency domain autocorrelation matrix and the frequency domain cross correlation matrix comprises:
calculating an inverse matrix of the frequency domain autocorrelation matrix;
and multiplying the frequency domain cross correlation matrix by the inverse matrix to obtain the frequency domain interpolation coefficient.
5. The method as claimed in claim 1, wherein said reconstructing the channel estimation value of the zero frequency position according to the frequency domain interpolation coefficient and the channel estimation value of the adjacent zero frequency position comprises:
and optimizing the estimation error of the zero-frequency position by using a least square method (LS) according to the frequency domain interpolation coefficient and the channel estimation value of the adjacent zero-frequency position so as to reconstruct the channel estimation value of the zero-frequency position.
6. A zero intermediate frequency receiver, comprising:
the receiving module is used for receiving a transmitting signal transmitted by the transmitter;
the acquisition module is connected with the receiving module and used for acquiring a power time delay spectrum based on the channel multipath response of the transmitting signal;
the correlation operation module is connected with the acquisition module and used for acquiring a frequency domain correlation value sequence according to the power time delay spectrum and determining a frequency domain interpolation coefficient according to the frequency domain correlation value sequence;
the estimation module is connected with the correlation operation module and used for reconstructing the channel estimation value of the zero frequency position according to the frequency domain interpolation coefficient and the channel estimation value of the adjacent zero frequency position;
and the equalization module is connected with the estimation module and used for carrying out channel equalization on the transmitting signal based on the channel estimation value and the direct current value of the zero-frequency position so as to demodulate and recover the original information of the zero-frequency position.
7. A zero intermediate frequency receiver according to claim 6, characterized in that the correlation operation module further determines the position of the energy maximum path of the transmitted signal according to the power delay spectrum; and taking K sampling points in front of the power time delay spectrum and P sampling points behind the power time delay spectrum by taking the position of the maximum energy diameter as a center to perform FFT operation so as to obtain the frequency domain correlation value sequence, wherein K and P are positive integers.
8. A zero intermediate frequency receiver according to claim 6, characterized in that the correlation operation module further obtains a frequency domain autocorrelation matrix and a frequency domain cross correlation matrix according to the frequency domain correlation value sequence; and determining the frequency domain interpolation coefficient according to the frequency domain autocorrelation matrix and the frequency domain cross-correlation matrix.
9. A zero intermediate frequency receiver according to claim 8, characterized in that the correlation operation module further calculates an inverse matrix of the frequency domain autocorrelation matrix and multiplies the frequency domain cross correlation matrix by the inverse matrix to obtain the frequency domain interpolation coefficients.
10. The zero intermediate frequency receiver of claim 6, wherein the estimation module further optimizes an estimation error of the zero frequency position using a least square method based on the frequency domain interpolation coefficients and the channel estimation values of the adjacent zero frequency positions to reconstruct the channel estimation values of the zero frequency positions.
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