CN111181882B - Phase noise compensation method and system for wireless communication system - Google Patents
Phase noise compensation method and system for wireless communication system Download PDFInfo
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- CN111181882B CN111181882B CN202010006670.XA CN202010006670A CN111181882B CN 111181882 B CN111181882 B CN 111181882B CN 202010006670 A CN202010006670 A CN 202010006670A CN 111181882 B CN111181882 B CN 111181882B
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- H04L27/00—Modulated-carrier systems
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- H04L2027/0024—Carrier regulation at the receiver end
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Abstract
The present disclosure relates to a phase noise compensation method of a wireless communication system, which includes: the method comprises the steps that a transmitting end transmits a carrier signal to a wireless channel based on channel coding, baseband modulation and radio frequency modulation and generates a receiving signal to be received by a receiving end, the receiving end obtains the baseband signal from a phase-locked loop circuit based on radio frequency demodulation, and obtains a gain baseband signal based on automatic gain control, further obtains a constellation diagram based on a region center calculation model, and samples, center points and standard constellation points corresponding to all constellation point regions, determines target constellation points corresponding to all the constellation point regions based on a distance calculation model, further replaces coordinates of the samples of all the constellation point regions to coordinates of the target constellation points corresponding to the constellation point regions based on the distance mapping model to realize phase noise compensation, so that a target constellation diagram is obtained, further a target receiving signal is obtained, and the receiving end obtains the target signal based on baseband demodulation, channel decoding and the target receiving signal.
Description
Technical Field
The present disclosure relates to the field of wireless communication technologies, and in particular, to a phase noise compensation method and system for a wireless communication system.
Background
In modern wireless communication, theoretical analysis of wireless communication systems assumes perfect phase reference estimation, but in actual wireless communication, the phase reference estimation is often noisy (i.e., phase noise) due to imperfect phase-locked loop circuit or imperfect channel estimation, and the phase noise can greatly reduce demodulation performance of the system.
Existing methods for suppressing phase noise focus on improving the accuracy of phase reference estimation, however, the accuracy of phase reference estimation is often not high.
Disclosure of Invention
The present disclosure has been made in view of the above circumstances, and an object thereof is to provide a phase noise compensation method and system for a wireless communication system, which can be easily integrated with an existing wireless communication system and can reduce the adverse effect of phase noise.
To this end, a first aspect of the present disclosure provides a phase noise compensation method for a wireless communication system, the phase noise compensation method for a wireless communication system having a transmitting end and a receiving end, the method comprising: the transmitting terminal transmits a carrier signal to a wireless channel based on channel coding, baseband modulation and radio frequency modulation, and the carrier signal obtains a receiving signal through the wireless channel; the receiving end receives the received signal, a baseband signal is obtained from the received signal based on radio frequency demodulation and a phase-locked loop circuit, a gain baseband signal is obtained based on the baseband signal and automatic gain control, the receiving end obtains a constellation diagram corresponding to the gain baseband signal based on a region center calculation model, so that a sample point corresponding to each constellation point region and each standard constellation point in the constellation diagram are obtained, a central point corresponding to each constellation point region is obtained, a norm distance between any one central point and each standard constellation point is obtained based on a distance calculation model, a minimum norm distance of the central point and a standard constellation point corresponding to the minimum norm distance are obtained and marked as target constellation points, coordinates of the sample point of each constellation point region are replaced to coordinates of a target constellation point corresponding to the constellation point region based on a distance mapping model to realize phase noise compensation, so that a target constellation diagram is obtained, and a target received signal is obtained based on baseband demodulation, channel decoding and the target received signal.
The method comprises the steps that a transmitting end transmits a carrier signal to a wireless channel based on channel coding, baseband modulation and radio frequency modulation, the carrier signal obtains a received signal through the wireless channel, a receiving end receives the received signal and obtains a baseband signal from the received signal, a gain baseband signal is obtained based on the baseband signal and automatic gain control, a constellation diagram, a sample point and a standard constellation point corresponding to each constellation point region are obtained based on a region center calculation model, a central point corresponding to each constellation point region is obtained, a norm distance between any one central point and each standard constellation point is obtained based on a distance calculation model, the standard constellation point corresponding to the minimum norm distance of the central point is marked as a target constellation point, coordinates of the sample point of each constellation point region are replaced to coordinates of the target constellation point corresponding to the constellation point region based on a distance mapping model to achieve phase noise compensation, a target constellation diagram is obtained, and then the target received signal is obtained based on the baseband, channel decoding and target received signal. Thereby, the negative effects of phase noise can be reduced and a higher accuracy of the phase reference estimation is obtained.
In the phase noise compensation method according to the first aspect of the present disclosure, optionally, a modulation order of the wireless communication system is known by the receiving end, and the number of the constellation point regions is the same as the modulation order. Thereby, the number of constellation point regions can be determined.
In the phase noise compensation method according to the first aspect of the present disclosure, optionally, the x-axis coordinates and the y-axis coordinates of the sample points corresponding to each of the constellation point regions are respectively averaged to obtain the corresponding central point. Thus, the center point corresponding to each constellation point region can be obtained.
In the phase noise compensation method according to the first aspect of the present disclosure, optionally, the norm distance satisfies: d ij ＝||C i -S j || 2 I = 1.. M, j = 1.. M, where C is C i Is the ith central point, S j Is the jth standard constellation point, and M is the modulation order of the wireless communication system. Thereby, a norm distance between the center point and the standard constellation point can be obtained.
The phase noise compensation method according to the first aspect of the present disclosure is optionally based on
i =1, a.. M, j =1, a.. M, M obtains a standard constellation point with a minimum norm distance from an i-th central point, and marks the standard constellation point with the minimum norm distance as a target constellation point of the i-th central point, where M is a modulation order of the wireless communication system, d is a modulation order of the wireless communication system, and d is a symbol of the i-th central point ij Is the norm distance. Thus, the target constellation point corresponding to each central point can be determined.
A second aspect of the present disclosure provides a phase noise compensation system of a wireless communication system having a transmitting apparatus and a receiving apparatus, the phase noise compensation system comprising: the transmitting device transmits a carrier signal to a wireless channel based on channel coding, baseband modulation and radio frequency modulator modulation, wherein the carrier signal obtains a receiving signal through the wireless channel; the receiving device receives the received signal, obtains a baseband signal from the received signal based on radio frequency demodulation and a phase-locked loop circuit, obtains a gain baseband signal based on the baseband signal and automatic gain control, obtains a constellation diagram corresponding to the gain baseband signal based on a region center calculation model, obtains sample points and standard constellation points corresponding to each constellation point region in the constellation diagram, further obtains central points corresponding to each constellation point region respectively, obtains a norm distance between any one central point and each standard constellation point based on a distance calculation model, further obtains a minimum norm distance of the central point and the standard constellation point corresponding to the minimum norm distance and marks the standard constellation point as a target constellation point, replaces coordinates of the sample points of each constellation point region to coordinates of the target constellation point corresponding to the constellation point region based on a distance mapping model to realize phase noise compensation so as to obtain a target constellation diagram, further obtains a target received signal, and obtains the target signal based on baseband demodulation, channel decoding and the target received signal.
The method comprises the steps that a transmitting device transmits a carrier signal to a wireless channel based on channel coding, baseband modulation and radio frequency modulation, the carrier signal obtains a received signal through the wireless channel, a receiving device receives the received signal and obtains a baseband signal from the received signal, a gain baseband signal is obtained based on the baseband signal and automatic gain control, a constellation diagram, a sample point and a standard constellation point corresponding to each constellation point region are obtained based on a region center calculation model, a central point corresponding to each constellation point region is obtained, a norm distance between any one central point and each standard constellation point is obtained based on a distance calculation model, the standard constellation point corresponding to the minimum norm distance of the central point is marked as a target constellation point, coordinates of the sample point of each constellation point region are replaced to coordinates of the target constellation point corresponding to the constellation point region based on a distance mapping model to achieve phase noise compensation, a target received signal is obtained, and the receiving device obtains the target signal based on the baseband, channel decoding and the target received signal.
In the phase noise compensation system according to the second aspect of the present disclosure, optionally, a modulation order of the wireless communication system is known by the receiving apparatus, and the number of the constellation point regions is the same as the modulation order. Thereby, the number of constellation point regions can be determined.
In the phase noise compensation system according to the second aspect of the present disclosure, optionally, the x-axis coordinates and the y-axis coordinates of the sample points corresponding to each of the constellation point regions are respectively averaged to obtain the corresponding central point. Thus, the center point corresponding to each constellation point region can be obtained.
In the phase noise compensation system according to the second aspect of the present disclosure, optionally, the norm distance satisfies: d ij ＝||C i -S j || 2 I = 1.. M, j = 1.. M, where C is C i Is the ith central point, S j And M is the modulation order of the wireless communication system. Thereby, a norm distance between the center point and the standard constellation point can be obtained.
The phase noise compensation system according to the second aspect of the present disclosure is optionally based on
i =1, a.. M, j =1, a.. M, M obtains a standard constellation point with a minimum norm distance from an i-th central point, and marks the standard constellation point with the minimum norm distance as a target constellation point of the i-th central point, where M is a modulation order of the wireless communication system, d is a modulation order of the wireless communication system, and d is a symbol of the i-th central point ij Is the norm distance. Thus, the target constellation point corresponding to each central point can be determined.
According to the present disclosure, it is possible to provide a phase noise compensation method and system for a wireless communication system that can be easily integrated with an existing wireless communication system and can reduce the negative effects of phase noise.
Drawings
Fig. 1 is a block diagram illustrating a classical wireless communication system to which examples of the present disclosure relate.
Fig. 2 is a block diagram illustrating a phase noise compensation method of a wireless communication system to which an example of the present disclosure relates.
Fig. 3 is a flowchart illustrating a phase noise compensation method of a wireless communication system to which an example of the present disclosure relates.
Fig. 4 is a diagram illustrating a constellation diagram in a multilevel keying system to which an example of the present disclosure relates.
Fig. 5 is a constellation diagram illustrating determining a target constellation point to which examples of the present disclosure relate.
Fig. 6 is a block diagram illustrating a phase noise compensation system of a wireless communication system to which an example of the present disclosure relates.
Detailed Description
Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description, the same components are denoted by the same reference numerals, and redundant description thereof is omitted. The drawings are schematic and the ratio of the dimensions of the components and the shapes of the components may be different from the actual ones.
The present disclosure provides a phase noise compensation method and system (also referred to simply as "phase noise compensation method and phase noise compensation system") for a wireless communication system. In the disclosure, the phase noise compensation method and system of the wireless communication system can be widely applied to the existing wireless communication system, can be more easily integrated with the existing wireless communication system, can more obviously reduce the influence of the phase noise on the phase reference estimation, and can improve the demodulation performance of the wireless communication system so as to improve the communication quality. The present disclosure is described in detail below with reference to the attached drawing figures.
Fig. 1 is a block diagram illustrating a classical wireless communication system to which an example of the present disclosure relates. Fig. 2 is a block diagram illustrating a phase noise compensation method of a wireless communication system to which an example of the present disclosure relates. As shown in fig. 1 and 2, the phase noise compensation method of the present disclosure may be applied to a classical wireless communication system, but examples of the present disclosure are not limited thereto and may also be applied to other wireless communication systems. The phase noise compensation method and system of the present disclosure can be more easily integrated with existing wireless communication systems.
In some examples, the phase noise compensation methods of the present disclosure may operate only on baseband circuitry, thereby enabling cost and complexity reduction. In some examples, the phase noise compensation method of the present disclosure may be to add a pre-processing procedure (described later) before the baseband demodulation 370, and may not change other parts, thereby enabling the phase noise compensation method of the present disclosure to be more easily integrated with the existing wireless communication system.
In the present disclosure, as shown in fig. 1 and 2, the phase noise compensation method has a phase noise compensation method of a wireless communication system of a transmitting end 10 and a receiving end 30, wherein the transmitting end 10 can transmit a signal to the receiving end 30 and be received by the receiving end 30.
In the present disclosure, a transmitting end 10 (e.g., an access point) may refer to a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminals. The transmitting end 10 may be configured to interconvert received air frames and IP frames as a router between the wireless terminal and the rest of the access network, which may include an Internet Protocol (IP) network. The transmitting end 10 may also coordinate the management of attributes for the air interface. For example, the transmitting end 10 may be a Base Transceiver Station (BTS) in GSM or CDMA, a Base Station (NodeB) in WCDMA, and an evolved Node B (NodeB or eNB or e-NodeB) in LTE.
In the present disclosure, the receiving end 30 may be a user. The user may include, but is not limited to, a user device. The user Device may include, but is not limited to, various electronic devices such as a smart Phone, a notebook Computer, a Personal Computer (PC), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a wearable Device (e.g., a smart watch, a smart bracelet, and smart glasses), wherein an operating system of the user Device may include, but is not limited to, an Android operating system, an IOS operating system, a Symbian operating system, a blackberry operating system, a Windows Phone8 operating system, and so on.
Fig. 3 is a flow chart diagram illustrating a phase noise compensation method of a wireless communication system to which an example of the present disclosure relates.
In the present embodiment, as shown in fig. 3, the phase noise compensation method may include the steps of: the transmitting terminal 10 transmits a carrier signal to the wireless channel 20 based on the channel coding 100, the baseband modulation 110 and the radio frequency modulation 120, and the carrier signal passes through the wireless channel 20 to obtain a received signal (step S10); the receiving end 30 receives the received signal, obtains a baseband signal from the received signal based on the rf demodulation 310 and the pll circuit 320, and obtains a gain baseband signal based on the baseband signal and the agc 330 (step S20); the receiving end 30 obtains a constellation diagram corresponding to the gain baseband signal based on the region center calculation model 340, so as to obtain sample points corresponding to each constellation point region and each standard constellation point in the constellation diagram, and further obtain central points corresponding to each constellation point region (step S30); obtaining a norm distance between any one center point and each standard constellation point based on the distance calculation model 350, further obtaining a minimum norm distance of the center point and a standard constellation point corresponding to the minimum norm distance and marking as a target constellation point (step S40); the coordinates of the sample points of each constellation point region are replaced with the coordinates of the target constellation point corresponding to the constellation point region based on the distance mapping model 360 to implement phase noise compensation, so as to obtain a target constellation diagram, and further obtain a target received signal, and obtain the target signal based on the baseband demodulation 370, the channel decoding 380, and the target received signal (step S50).
In the present disclosure, the transmitting terminal 10 may transmit a carrier signal to the wireless channel 20 based on the channel coding 100, the baseband modulation 110 and the radio frequency modulation 120, the carrier signal may obtain a received signal through the wireless channel 20, the receiving terminal 30 may receive the received signal and obtain a baseband signal therefrom, obtain a gain baseband signal based on the baseband signal and the automatic gain control 330, further obtain a constellation diagram, a sample point and a standard constellation point corresponding to each constellation point region based on the region center calculation model 340, and obtain a central point corresponding to each constellation point region, obtain a norm distance between any one central point and each standard constellation point based on the distance calculation model 350, mark the standard constellation point corresponding to the minimum norm distance of the central point as a target constellation point, further replace coordinates of the sample point of each constellation point region to coordinates of the target constellation point corresponding to the constellation point region based on the distance mapping model 360 to implement phase noise compensation, thereby obtaining a target constellation diagram, further obtain a target received signal, and the receiving terminal 30 may obtain a target received signal based on the baseband demodulation 370, the channel decoding 380 and the target received signal.
In step S10, the transmitting end 10 transmits a carrier signal to the wireless channel 20 based on the channel coding 100, the baseband modulation 110 and the radio frequency modulation 120, and the carrier signal passes through the wireless channel 20 to obtain a receiving signal.
In some examples, as shown in fig. 1, a data source may first undergo channel coding 100 and baseband modulation 110 to obtain a baseband modulation signal in a transmitting end 10, where a modulation order of the baseband modulation 110 is M, pilot symbols may then be periodically embedded in the baseband modulation symbols, a carrier signal may then be obtained through radio frequency modulation 120, and the transmitting end 10 may transmit the carrier signal onto a wireless channel 20, where a transmission power of the carrier signal may be represented as P s 。
In some examples, the carrier signal is passed through a wireless channel 20 to obtain a received signal and received by a receiving end 30. In some examples, the receiving end 30 may receive a received signal satisfying:
where h (t) is expressed as the channel response (i.e., the actual channel fading estimate) of the fading amplitude η (t) and the fading phase θ (t) and satisfies: h (t) = η (t) exp (j θ (t)), s (t) is expressed as a baseband modulation signal, ω (t) = η (t) exp (j θ (t)), and s (t) is expressed as a baseband modulation signal 0 Expressed as carrier frequency, [ phi ] (t) expressed as random phase of the received carrier, n (t) expressed as reception noise and complex white gaussian noise and satisfying: />
Wherein it is present>
Is the variance.
In some examples, wireless channel 20 may assume a flat fading channel model, each data frame may experience an independent channel fade, and the channel fade may remain constant for its duration, but may change over different data frames. Wherein, the frame length can be L, the fading amplitude and the fading phase can be respectively [ - π, π]The probability density function of the Nakagami-m distribution can satisfy the following conditions:
eta is greater than or equal to 0, wherein m is equal to [1/2, ∞), and Gamma (·) is a Gamma function. In some examples, the instantaneous channel signal-to-noise ratio may satisfy: />
The average channel signal-to-noise ratio is expressed as->
Where s is expressed as the baseband modulation signal and η is expressed as the fading amplitude.
In step S20, the receiving end 30 receives the received signal, obtains a baseband signal from the received signal based on the rf demodulation 310 and the pll circuit 320, and obtains a gain baseband signal based on the baseband signal and the agc 330.
In some examples, as shown in fig. 1, the receiving end 30 may receive a received signal. The received signal in the receiving end 30 can be processed by rf demodulation 310 and phase-locked loop circuit 320 to obtain a baseband signal. In some examples, the phase-locked loop circuit 320 may be undesirable and may therefore result in a first phase error (i.e., first phase noise) that may satisfy:
wherein +>
Denoted as the first phase, phi (t), obtained by the phase-locked loop circuit 320Indicated as the actual first phase. In some examples, the first phase error may be modeled as Tikhonov, whereby a probability density function of the first phase error may be obtained satisfying: />
Where α is expressed as the normalized circulating signal-to-noise ratio, I, of the phase-locked loop circuit 320 0 Expressed as the zeroth order modified Bessel function. In some examples, the partial transmission power reserved for pilot symbols may satisfy: p is c ＝χP s Wherein χ is P s Is fixed coefficient of (a). The approximation of α satisfies: />
Wherein, B L Expressed as loop bandwidth, T b Represented as a bit interval.
In some examples, rf demodulation 310 may utilize the suppressed intersymbol interference of rf modulation 120 of transmitting end 10, and through the pilot symbols and the pilot observations, may enable receiving end 30 to obtain the channel fading estimation and satisfy:
wherein it is present>
Denoted as the fading amplitude obtained by the receiving end 30 based on the channel estimation. In some examples, there is a second phase error (i.e., second phase noise) that satisfies: />
Wherein it is present>
Denoted as the fading phase obtained by the receiving end 30 based on the channel estimation, and θ (t) is denoted as the actual fading phase. In some examples, the probability density function for the second phase error may satisfy:
wherein ρ is a correlation coefficient and satisfies: />
In some examples, ρ may be set to a constant.
In some examples, as shown in fig. 1, the baseband signal may be subjected to an automatic gain control 330 to obtain a gain baseband signal. Wherein, the gain baseband signal can satisfy:
in some examples, the baseband signal is passed through an automatic gain control 330 to obtain a gain baseband signal, which may be divided by the channel fade estimate ≧ or>
The quotient of (1) compensates channel fading to obtain a gain baseband signal after channel fading compensation, and the following conditions are met:
wherein +>
Expressed as total residual phase noise (i.e., total phase error) and satisfies: />
Denoted as residual received noise, which may be obtained after the received noise is affected by the channel estimation and satisfies: />
In some examples, as shown in fig. 1, in a classical wireless communication system, a gain baseband signal may obtain information (i.e., a data source) transmitted by the transmitting end 10 through baseband demodulation 370, but due to the presence of phase noise, the phase noise may cause constellation points to deviate from an original position, which may greatly reduce demodulation performance of the receiving end 30, and thus the receiving end 30 may not obtain accurate information.
In some examples, the abscissa I of fig. 4 and 5 is the phase amplitude and the ordinate Q is the quadrature amplitude.
Fig. 4 is a diagram illustrating a constellation diagram in a multilevel keying system to which examples of the present disclosure relate. Where (a) in fig. 4 is a constellation diagram in the absence of phase noise, and (b) in fig. 4 is a constellation diagram in the presence of phase noise.
In some examples, as shown in fig. 4 (a) and fig. 4 (b), in a multilevel frequency shift keying system, phase noise may cause constellation points to deviate from original positions. In fig. 4 (a), the positions of the constellation points are not affected by the phase noise, where the distances from the center point corresponding to any constellation point region to the two nearest decision region edges are equal, i.e. d 1 ＝d 2 . In fig. 4 (b), the position of the constellation point is shifted by the phase noise, and the distances from the shifted constellation point region to the two nearest decision region edges are different, i.e. d 3 ≠d 4 . In some examples, the demodulation error probability may be determined by the smaller of the distances from the constellation point to the edges of the two decision regions, i.e., in (b) of fig. 4, the demodulation error probability is determined by d 4 It is decided that in this case, the phase noise may degrade the demodulation performance. The present disclosure provides a phase noise compensation method of a wireless communication system capable of reducing an influence of phase noise on phase reference estimation, which may preprocess a gain baseband signal to obtain a target reception signal.
Fig. 5 is a constellation diagram illustrating determining a target constellation point to which examples of the present disclosure relate.
In step S30, the receiving end 30 obtains a constellation diagram corresponding to the gain baseband signal (here, the gain baseband signal may be a "gain baseband signal after compensating for channel fading") based on the region center calculation model 340, so as to obtain sample points corresponding to each constellation point region and each standard constellation point in the constellation diagram, and further obtain center points corresponding to each constellation point region.
In some examples, as shown in fig. 5, the gain baseband signal may obtain a constellation diagram corresponding to the gain baseband signal through the region center calculation model 340, so that corresponding sample points in each constellation point region in the constellation diagram may be obtained, for example, the constellation point region 400 and corresponding sample point 401, sample point 402, sample point 403, the constellation point region 410 and corresponding sample point, the constellation point region 420 and corresponding sample point, the constellation point region 430 and corresponding sample point. In some examples, the receiving end 30 may obtain each standard constellation point in the constellation diagram, for example, the standard constellation point S 1 Standard star point S 2 Standard star point S 3 And standard constellation point S 4 . The number of standard constellation points may be the same as the number of constellation point regions.
In some examples, the receiving end 30 may obtain the central point corresponding to each constellation point region, for example, the central point C corresponding to the constellation point region 400, based on each sample point 1 The center point C corresponding to the constellation point region 410 2 The center point C corresponding to the constellation point region 420 3 The center point C corresponding to the constellation point region 430 4 . In some examples, the x-axis coordinates and the y-axis coordinates of the sample points corresponding to each constellation point region are respectively averaged to obtain the coordinates of the center point corresponding to the constellation point region. For example, by averaging the x-axis coordinates and the y-axis coordinates corresponding to the sample points 401, 402, and 403, respectively, of the sample points 401, 402, and 403 corresponding to the constellation point region 400, the center point C corresponding to the constellation point region 400 can be obtained 1 The coordinates of (a). Thus, the center point corresponding to each constellation point region can be obtained. The number of center points may be the same as the number of constellation point regions.
In some examples, the modulation order M may be known by the receiving end 30, and the number of constellation point regions may be the same as the modulation order M. Thereby, the number of constellation point regions can be determined.
In step S40, the receiving end 30 may obtain a norm distance between any central point and each standard constellation point based on the distance calculation model 350, further obtain a minimum norm distance of the central point and a standard constellation point corresponding to the minimum norm distance, and mark the minimum norm distance and the standard constellation point as a target constellation point.
In some examples, the receiving end 30 may obtain a norm distance between any one central point and each standard constellation point based on the central points and the standard constellation points obtained by the distance calculation model 350 and the region center calculation model 340. In some examples, the norm distance between any one center point and each standard constellation point may satisfy: d ij ＝||C i -S j || 2 I =1,.. M, j =1,.. M (2), wherein C i Is the ith central point, S j Is the jth standard constellation point, and M is the modulation order. Thereby, a norm distance between the center point and the standard constellation point can be obtained. In some examples, the receiving end 30 is based on
i = 1.. M, j = 1.. M (3) may obtain a standard constellation point having a smallest norm distance from the ith centerpoint, which is labeled as the target constellation point of the ith centerpoint. Therefore, the target constellation point corresponding to each central point can be determined, namely the target constellation point corresponding to each constellation point region is determined. For example, as shown in fig. 5, the constellation diagram region 400 corresponds to a center point C 1 (i.e., the 1 st center point), the center point C can be obtained based on the formula (2) 1 With each standard constellation point (e.g. standard constellation point S) 1 Standard star point S 2 Standard star point S 3 And standard constellation point S 4 ) The norm distance between the central point C and the central point C can be obtained by the formula (3) 1 Standard constellation point (e.g. standard constellation point S) with the smallest norm distance 2 ) Therefore, the standard star point S can be obtained 2 Marked as centre point C 1 Thereby obtaining the target constellation point corresponding to each central point, i.e. the standard constellation point S 2 May be the target constellation point corresponding to the constellation diagram region 400, and in addition, the standard constellation point S in fig. 5 3 Can be marked as a center point C 2 Is the target constellation point, i.e. the standard constellation point S 3 Can be prepared byIs a target constellation point, standard constellation point S, corresponding to the constellation map region 410 4 Can be marked as a center point C 3 Of the target constellation point, i.e. the standard constellation point S 4 May be a target constellation point, a standard constellation point S, corresponding to the constellation map region 420 1 Can be marked as a center point C 4 Is the target constellation point, i.e. the standard constellation point S 1 May be the target constellation point corresponding to the constellation map region 430.
In step S50, the receiving end 30 may replace the coordinates of the sample point of each constellation point region to the coordinates of the target constellation point corresponding to the constellation point region based on the distance mapping model 360 to implement phase noise compensation so as to obtain a target constellation diagram, and then obtain a target received signal, and obtain the target signal based on the baseband demodulation 370 and the target received signal.
In some examples, the receiving end 30 may replace, based on the target constellation points respectively corresponding to the respective constellation point regions obtained by the distance mapping model 360 and the distance calculation model 350, the coordinates of the sample point of each constellation point region to the coordinates of the target constellation point corresponding to the constellation point region, that is, each constellation point region is to be moved so that the coordinates of the corresponding sample point are moved to the coordinates of the target constellation point corresponding to the constellation point region. For example, as shown in fig. 5, the sample points 401, 402, 403 in the constellation point region 400 will all be moved to the standard constellation point S 2 The sample points in the other constellation point regions (e.g., constellation point region 410, constellation point region 420, and constellation point region 430) in fig. 5 will also be shifted accordingly. In this case, the phase noise compensation may be implemented by replacing the coordinates of the sample point of each constellation point region with the coordinates of the target constellation point corresponding to the constellation point region. Therefore, the target constellation diagram can be obtained, and further, the target receiving signal can be obtained.
In some examples, the gain baseband signal may be pre-processed (i.e., the gain baseband signal passes through the region center calculation model 340, the distance calculation model 350, and the distance mapping model 360 in sequence) to obtain the target received signal. In some examples, the target received signal may be subjected to baseband demodulation 370 and channel decoding 380 to obtain the target signal, so that the receiving end 30 can more accurately obtain the information sent by the transmitting end 10.
Fig. 6 is a block diagram illustrating a phase noise compensation system of a wireless communication system to which an example of the present disclosure relates.
The present disclosure relates to a phase noise compensation system 1 of a wireless communication system. The phase noise compensation system 1 includes a transmitting apparatus 50 and a receiving apparatus 60. In the present disclosure, the transmitting apparatus 50 in the phase noise compensation system 1 may be similar to the transmitting end 10 in the phase noise compensation method, and the receiving apparatus 60 may be similar to the receiving end 30 in the phase noise compensation method.
In some examples, as shown in fig. 6, the phase noise compensation system 1 may include a transmitting apparatus 50 and a receiving apparatus 60. In some examples, the transmitting device 50 may transmit a signal to the receiving device 60 and be received by the receiving device 60.
In some examples, transmitting apparatus 50 may transmit a carrier signal to a wireless channel based on channel coding, baseband modulation, and radio frequency modulator modulation, the carrier signal obtaining a received signal over the wireless channel. The transmitting device 50 may send information to the receiving device 60. The specific process can be seen in step S10 of the phase noise compensation method described above.
In some examples, the receiving device 60 may receive a received signal, obtain a baseband signal from the received signal based on rf demodulation and phase-locked loop circuitry, and obtain a gain baseband signal based on the baseband signal and automatic gain control. The receiving device 60 can receive and process the received signal. The specific process can be seen in step S20 of the phase noise compensation method described above.
In some examples, the receiving apparatus 60 may obtain a constellation map corresponding to the gain baseband signal based on the region center calculation model, so as to obtain sample points corresponding to each constellation point region in the constellation map and each standard constellation point, and further obtain central points corresponding to each constellation point region respectively. Therefore, the constellation diagram and the sample point, the central point and each standard constellation point corresponding to each constellation point region in the constellation diagram can be obtained. The specific process can be seen in step S30 of the phase noise compensation method described above.
In some examples, the receiving apparatus 60 may obtain a norm distance between any one central point and each standard constellation point based on the distance calculation model, and further obtain a minimum norm distance of the central point and a standard constellation point corresponding to the minimum norm distance and mark the standard constellation point as the target constellation point. Thus, target constellation points corresponding to the central points can be obtained, and target constellation points corresponding to the constellation point regions can be obtained. The specific process can be seen in step S40 of the phase noise compensation method.
In some examples, the receiving apparatus 60 may replace the coordinates of the sample points of each constellation point region to the coordinates of the target constellation point corresponding to the constellation point region based on the distance mapping model to implement phase noise compensation so as to obtain the target constellation map, and then obtain the target received signal, which is obtained based on baseband demodulation, channel decoding, and the target received signal. The receiving device 60 can thereby obtain the information transmitted by the transmitting device 50 relatively accurately. The specific process can be seen in step S50 of the phase noise compensation method described above.
As described above, in the present disclosure, the transmitting device 50 may transmit a carrier signal to a wireless channel based on channel coding, baseband modulation, and radio frequency modulation, the carrier signal obtains a received signal through the wireless channel, the receiving device 60 may receive the received signal and obtain a baseband signal therefrom, obtain a gain baseband signal based on the baseband signal and automatic gain control, further obtain a constellation diagram, a sample point corresponding to each constellation point region, and a standard constellation point based on a region center calculation model, and obtain a center point corresponding to each constellation point region, obtain a norm distance between any one center point and each standard constellation point based on the distance calculation model, mark the standard constellation point corresponding to the minimum norm distance of the center point as a target constellation point, further replace coordinates of the sample point of each constellation point region with coordinates of the target constellation point corresponding to the constellation point region based on the distance mapping model to implement phase noise compensation, thereby obtaining a target constellation diagram, further obtain a target received signal, and the receiving device 60 obtains the target signal based on baseband demodulation, channel decoding, and the target received signal. Thus, the receiving apparatus 60 can compensate for the generated phase noise, and can obtain the information transmitted by the transmitting apparatus 50 relatively accurately.
While the present disclosure has been described in detail in connection with the drawings and the examples, it should be understood that the above description is not intended to limit the present disclosure in any way. Variations and changes may be made as necessary by those skilled in the art without departing from the true spirit and scope of the disclosure, which fall within the scope of the disclosure.
Claims (6)
1. A phase noise compensation method for a wireless communication system having a transmitting end and a receiving end,
the method comprises the following steps:
the transmitting terminal transmits a carrier signal to a wireless channel based on channel coding, baseband modulation with a modulation order of M and radio frequency modulation, wherein the carrier signal obtains a receiving signal through the wireless channel, the transmitting terminal firstly obtains a baseband modulation signal through the channel coding and the baseband modulation of a data source, then periodically embeds a pilot symbol into the baseband modulation signal and obtains the carrier signal through the radio frequency modulation;
the receiving end receives the receiving signal, obtains a baseband signal from the receiving signal based on radio frequency demodulation and a phase-locked loop circuit, obtains a gain baseband signal based on the baseband signal and automatic gain control,
the receiving end obtains a constellation diagram corresponding to the gain baseband signal based on a region center calculation model so as to obtain sample points corresponding to each constellation point region in the constellation diagram and each standard constellation point, further obtains a central point corresponding to each constellation point region, obtains a norm distance between any one central point and each standard constellation point based on a distance calculation model, further obtains a minimum norm distance of the central point and a standard constellation point corresponding to the minimum norm distance and marks the minimum norm distance as a target constellation point,
replacing the coordinates of the sample points of each constellation point region to the coordinates of the target constellation point corresponding to the constellation point region based on a distance mapping model to realize phase noise compensation so as to obtain a target constellation diagram and further obtain a target receiving signal, wherein the target receiving signal is subjected to baseband demodulation and channel decoding to obtain a target signal,
wherein the norm distance satisfies: d ij ＝||C i -S j || 2 I = 1.. M, j = 1.. M, where C is C i Is the ith central point, S j Is the jth standard constellation point, M is the modulation order of the wireless communication system, and the receiving end is based on
Obtaining a standard constellation point with the minimum norm distance with the ith central point, marking the standard constellation point with the minimum norm distance as a target constellation point of the ith central point,
in the replacement, each constellation point region is moved so that the coordinates of the sample point corresponding to the constellation point region are moved to the coordinates of the target constellation point corresponding to the constellation point region.
2. The phase noise compensation method according to claim 1, characterized in that:
the modulation order of the wireless communication system is known by the receiving end, and the number of the constellation point areas is the same as the modulation order.
3. The phase noise compensation method according to claim 1, characterized in that:
and respectively averaging the x-axis coordinates and the y-axis coordinates of the sample points corresponding to each constellation point region to obtain the corresponding central points.
4. A phase noise compensation system of a wireless communication system having a transmitting device and a receiving device,
the method comprises the following steps:
the transmitting device transmits a carrier signal to a wireless channel based on channel coding, baseband modulation with a modulation order of M and radio frequency modulator modulation, wherein the carrier signal obtains a receiving signal through the wireless channel, the transmitting device firstly obtains a baseband modulation signal through the channel coding and the baseband modulation of a data source, then periodically embeds a pilot symbol into the baseband modulation signal and obtains the carrier signal through the radio frequency modulation;
the receiving means receives the received signal, obtains a baseband signal from the received signal based on radio frequency demodulation and a phase locked loop circuit, obtains a gain baseband signal based on the baseband signal and automatic gain control,
the receiving device obtains a constellation diagram corresponding to the gain baseband signal based on a region center calculation model, so as to obtain sample points and standard constellation points corresponding to each constellation point region in the constellation diagram, further obtain central points corresponding to each constellation point region, obtain norm distances between any one central point and each standard constellation point based on a distance calculation model, further obtain a minimum norm distance of the central point and a standard constellation point corresponding to the minimum norm distance, and mark the minimum norm distance as a target constellation point,
replacing the coordinates of the sample points of each constellation point region to the coordinates of the target constellation point corresponding to the constellation point region based on a distance mapping model to realize phase noise compensation so as to obtain a target constellation diagram and further obtain a target receiving signal, wherein the target receiving signal is subjected to baseband demodulation and channel decoding to obtain a target signal,
wherein the norm distance satisfies: d ij ＝||C i -S j || 2 I = 1.. M, j = 1.. M, where C is C i Is the ith central point, S j Is the j standard constellation point, M is the modulation order of the wireless communication system, and the receiving device is based on
Obtaining a standard constellation point with the minimum norm distance with the ith central point, marking the standard constellation point with the minimum norm distance as a target constellation point of the ith central point,
in the replacement, each constellation point region is moved so that the coordinates of the sample point corresponding to the constellation point region are moved to the coordinates of the target constellation point corresponding to the constellation point region.
5. The phase noise compensation system of claim 4, wherein:
the modulation order of the wireless communication system is known by the receiving device, and the number of the constellation point areas is the same as the modulation order.
6. The phase noise compensation system of claim 4, wherein:
and respectively averaging the x-axis coordinate and the y-axis coordinate of the sample point corresponding to each constellation point region to obtain the corresponding central point.
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