CN118300621A

CN118300621A - Signal processing method, receiver, equipment and storage medium

Info

Publication number: CN118300621A
Application number: CN202310004795.2A
Authority: CN
Inventors: 雷立辉; 高宁泊
Original assignee: Zeku Technology Beijing Corp Ltd
Current assignee: Zeku Technology Beijing Corp Ltd
Priority date: 2023-01-03
Filing date: 2023-01-03
Publication date: 2024-07-05

Abstract

The application discloses a signal processing method, a receiver, equipment and a storage medium, wherein at least one first signal output by an analog-to-digital converter is input to a first filter; filtering each first signal in the at least one first signal through the first filter to obtain at least one second signal, wherein the second signal is attenuated at a first frequency of the corresponding first signal, and the first frequency is the frequency of a spurious signal in the at least one first signal; determining at least one third signal based on at least the first frequency and the at least one second signal, wherein each third signal in the at least one third signal is a signal obtained by channel estimation and demodulation of a corresponding second signal; the at least one third signal is decoded.

Description

Signal processing method, receiver, equipment and storage medium

Technical Field

The present application relates to wireless communication technologies, and in particular, to a signal processing method, a receiver, a device, and a storage medium.

Background

The receiver's operating modes include Global System for Mobile communications (Global System for Mobile Communications, GSM), wideband code division multiple Access (Wideband Code Division Multiple Access, WCDMA), long term evolution (Long Term Evolution) LTE, new Radio (NR), wireless Fidelity (WIRELESSFIDELITY, WI-FI), etc. In addition to the desired useful signal, unwanted Frequency signals, referred to as spurs (spurious, non-integer multiples of the input Frequency) and harmonics (harmonics, integer multiples of the input Frequency) are also generated in the output signal of a Radio Frequency (RF) transceiver or mixer, where the spurs and harmonics are collectively referred to as spurs. Spurious signals will cause a degradation of the signal-to-noise ratio of the receiver.

Disclosure of Invention

The embodiment of the application provides a signal processing method, a receiver, equipment and a storage medium, which are used for attenuating spurious signals, simultaneously not damaging useful received signals in a passband, processing residual spurious signals in a baseband and improving the signal to noise ratio of the signals.

The technical scheme of the embodiment of the application is realized as follows:

the embodiment of the application provides a signal processing method, which comprises the following steps:

inputting at least one first signal output by the analog-to-digital converter to a first filter;

Filtering each first signal in the at least one first signal through the first filter to obtain at least one second signal, wherein the second signal is attenuated at a first frequency of the corresponding first signal, and the first frequency is the frequency of a spurious signal in the at least one first signal;

Determining at least one third signal based on at least the first frequency and the at least one second signal, wherein each third signal in the at least one third signal is a signal obtained by channel estimation and demodulation of a corresponding second signal;

the at least one third signal is decoded.

An embodiment of the present application provides a receiver, including:

the analog-to-digital conversion module is used for inputting at least one first signal to the first filter;

The first filtering module filters each first signal in the at least one first signal to obtain at least one second signal, wherein the second signal is attenuated at a first frequency of the corresponding first signal, and the first frequency is the frequency of a spurious signal in the at least one first signal;

An estimation demodulation module, configured to determine at least one third signal based on at least the first frequency and the at least one second signal, where each third signal in the at least one third signal is a signal obtained by performing channel estimation and demodulation on a corresponding second signal;

And the decoding module is used for decoding the at least one third signal.

Embodiments of the present application provide an electronic device comprising a receiver as described in one or more of the embodiments above.

An embodiment of the application provides an electronic device comprising a processor configured to:

the at least one third signal is decoded.

The embodiment of the application provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the steps in the signal processing method when executing the computer program.

An embodiment of the present application provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described signal processing method.

The chip provided by the embodiment of the application is used for realizing the signal processing method, and comprises the following steps: and a processor for calling and running the computer program from the memory, so that the device mounted with the chip executes the signal processing method.

The signal processing method, the receiver, the device and the storage medium provided by the embodiment of the application input at least one first signal output by the analog-to-digital converter to the first filter; filtering each first signal in the at least one first signal through the first filter to obtain at least one second signal, wherein the second signal is attenuated at a first frequency of the corresponding first signal, and the first frequency is the frequency of a spurious signal in the at least one first signal; determining at least one third signal based on at least the first frequency and the at least one second signal, wherein each third signal in the at least one third signal is a signal obtained by channel estimation and demodulation of a corresponding second signal; decoding the at least one third signal, so that when filtering, filtering the spurious signals, the useful signals except the frequency of the spurious signals can not be damaged, the spurious signals can be well restrained, the useful signals in the passband are not influenced, meanwhile, the signals are continuously processed through the first frequency of the spurious signals in the channel estimation and demodulation stages, and therefore the residual spurious signals are processed in the baseband, and the signal to noise ratio of the signals is improved.

Drawings

Fig. 1 is a schematic diagram of an alternative architecture of a receiver according to an embodiment of the present application;

fig. 2 is a schematic diagram of an alternative architecture of a receiver according to an embodiment of the present application;

FIG. 3 is a schematic flow chart of an alternative signal processing method according to an embodiment of the present application;

FIG. 4 is an alternative schematic diagram of the amplitude-frequency characteristic of the first filter provided by the embodiment of the present application;

FIG. 5 is a schematic flow chart of an alternative signal processing method according to an embodiment of the present application;

fig. 6 is a schematic diagram of an alternative architecture of a receiver provided by an embodiment of the present application;

fig. 7 is a schematic diagram of an alternative architecture of a receiver provided by an embodiment of the present application;

fig. 8 is a schematic diagram of an alternative architecture of a receiver provided by an embodiment of the present application;

fig. 9 is a schematic diagram of an alternative architecture of a receiver provided by an embodiment of the present application;

Fig. 10 is a schematic diagram of an alternative architecture of a receiver provided by an embodiment of the present application;

fig. 11 is a schematic diagram of an alternative architecture of a receiver provided by an embodiment of the present application;

FIG. 12 is a schematic diagram of comparing signal to noise ratios provided by an embodiment of the present application;

FIG. 13 is a schematic diagram illustrating comparison of signal to noise ratios provided by an embodiment of the present application;

Fig. 14 is a schematic view showing an alternative structure of a signal processing apparatus according to an embodiment of the present application;

FIG. 15 is an alternative schematic block diagram of an electronic device provided by an embodiment of the present application;

FIG. 16 is an alternative schematic block diagram of an electronic device provided by an embodiment of the present application;

fig. 17 is an alternative schematic structural diagram of an electronic device provided in an embodiment of the present application.

Detailed Description

The present application will be further described in detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present application more apparent, and the described embodiments should not be construed as limiting the present application, and all other embodiments obtained by those skilled in the art without making any inventive effort are within the scope of the present application.

The embodiment of the application can be provided as a signal processing method, a device, equipment and a storage medium. In practical applications, the signal processing method may be implemented by a signal processing apparatus, and each functional entity in the signal processing apparatus may be cooperatively implemented by a hardware resource of a computer device (e.g., an electronic device such as a terminal device or a network device), a computing resource such as a processor, and a communication resource (e.g., for supporting communications in various manners such as implementing an optical cable or a cellular).

Of course, the embodiments of the present application are not limited to being provided as methods and hardware, but may be implemented in various ways, such as being provided as a storage medium (storing instructions for performing the signal processing methods provided by the embodiments of the present application).

Fig. 1 is a schematic diagram of a receiver according to an embodiment of the application.

As shown in fig. 1, the receiver 100 may include: an analog-to-digital converter 101, a first filter 102, a channel estimation module 103, a demodulation module 104, and a decoding module 105. The analog-to-digital converter 101 is configured to perform analog-to-digital conversion on a signal received by the antenna to obtain a first signal, the first filter 102 is configured to filter the first signal to obtain a second signal, the channel estimation module 103 is configured to perform channel estimation on the second signal to obtain channel estimation information, the demodulation module 104 is configured to demodulate the second signal based on the channel estimation information to obtain a third signal, and the decoding module 105 is configured to decode the third signal to obtain data information.

In some embodiments, on the basis of the receiver shown in fig. 1, as shown in fig. 2, the method further includes: an antenna 106, a low noise amplifier 107, a mixer 108, a low pass filter 109.

In order to facilitate understanding of the technical solutions of the embodiments of the present application, the following description describes related technologies of the embodiments of the present application, and the following related technologies may be optionally combined with the technical solutions of the embodiments of the present application as alternatives, which all belong to the protection scope of the embodiments of the present application.

Embodiments of a signal processing method, a receiver, a device, and a storage medium according to embodiments of the present application are described below with reference to a schematic diagram of a receiver shown in fig. 1 or fig. 2.

The embodiment of the application provides a signal processing method, which is applied to electronic equipment, as shown in fig. 3, and can include:

S301, the electronic device inputs at least one first signal output by the analog-to-digital converter to the first filter.

The electronic equipment receives signals through at least one antenna, the signals received by the antennas are input to an analog-to-digital converter through a low-noise amplifier, a mixer and a low-pass filter, the analog-to-digital converter carries out analog-to-digital conversion on the signals of the antennas to obtain first signals corresponding to the antennas, and the first signals corresponding to the antennas are input to the first filter.

Here, the at least one first signal received by the first filter includes a spurious signal, where a source of the spurious signal may include: antenna reception, clock signals, etc., the source of the spurious signals is not limited in the embodiment of the present application.

S302, the electronic equipment filters each first signal in the at least one first signal through the first filter to obtain at least one second signal, wherein the second signal is a signal attenuated at a first frequency of the corresponding first signal, and the first frequency is the frequency of a spurious signal in the at least one first signal.

The first filter belongs to a band stop filter, and the stop band is very narrow and is only the center frequency of the first filter. In an example, the amplitude-frequency characteristic of the first filter is as shown in fig. 4, the amplitude |h (e ^iω) | at the center frequency f0 is 0, and the amplitude |h (e ^iω) | at other frequencies than the center frequency f0 is 1, so that the first filter filters only the signal at the center frequency f 0.

After the first filter detects the first frequency of a spurious signal, the center frequency of the first filter is set to be the first frequency, at this time, when the first filter filters each first signal in at least one first signal, the first signal is attenuated rapidly at the center frequency, so that the spurious signal of the first frequency is prevented from passing through the first filter, and signals with bandwidths beyond the center frequency are not affected by the first filter.

Here, the first filter may be a notch filter (notch filter).

S303, the electronic equipment determines at least one third signal at least based on the first frequency and the at least one second signal, wherein each third signal in the at least one third signal is a signal obtained by channel estimation and demodulation of the corresponding second signal.

An estimated demodulation module in the electronic device determines at least one third signal based at least on the first frequency and the at least one second signal. Wherein the estimation demodulation module may include a channel estimation module and a demodulation module.

The first filter sends the filtered at least one second signal out of the channel estimation module, and as shown in fig. 5, the first filter 102 sends the first frequencies to the channel estimation module 103 and the demodulation module 104, respectively. The channel estimation module receives the first frequency and the at least one second signal, performs channel estimation on the received at least one second signal based on the first frequency to obtain channel estimation information, and sends the at least one second signal and the channel estimation information to the demodulation module, and the demodulation module demodulates the at least one second signal based on the first frequency signal and the channel estimation information after receiving the first at least one second signal and the channel estimation information.

In the embodiment of the application, the principle of channel estimation is filtering, and a filtering matrix is multiplied by a pilot signal in a certain time-frequency range to obtain channel estimation information; for example, the channel estimation information Hest can be expressed as formula (1):

hest=sum (W _i*H_i), i=0,..n-1 formula (1);

Wherein N is the number of second signals included in at least one second signal, W _i is the filter matrix of the ith second signal, H _i is the pilot signal of the ith second signal, and the pilot signals corresponding to different second signals may be the same or different.

In the embodiment of the present application, the channel estimation information includes channel state information of a pilot signal and channel state information of a data signal, and the method for obtaining the channel state information of the pilot signal may include: least Square (LS), minimum mean square error (Minimum Mean Square Error, MMSE), and the like. The method of obtaining channel state information of a data signal may include: interpolation, and the like. In the embodiment of the application, the method for carrying out channel estimation on the channel estimation module is not limited.

S304, the electronic equipment decodes the at least one third signal.

After the demodulation module in the electronic equipment obtains at least one third signal, the at least one third signal is sent to the decoding module, and the decoding module decodes the at least one third signal to obtain information carried by the at least one third signal.

According to the signal processing method provided by the embodiment of the application, at least one first signal output by the analog-to-digital converter is input to the first filter; filtering each first signal in the at least one first signal through the first filter to obtain at least one second signal, wherein the second signal is attenuated at a first frequency of the corresponding first signal, and the first frequency is the frequency of a spurious signal in the at least one first signal; determining at least one third signal based on at least the first frequency and the at least one second signal, wherein each third signal in the at least one third signal is a signal obtained by channel estimation and demodulation of a corresponding second signal; decoding the at least one third signal, so that when filtering, filtering the spurious signals, the useful signals except the frequency of the spurious signals can not be damaged, the spurious signals can be well restrained, the useful signals in the passband are not influenced, meanwhile, the signals are continuously processed through the first frequency of the spurious signals in the channel estimation and demodulation stages, and therefore the residual spurious signals are processed in the baseband, and the signal to noise ratio of the signals is improved.

In some embodiments, as shown in fig. 6, prior to S302, the electronic device also performs the following processing:

and S305, the electronic equipment detects the frequency position of the spurious signals in the at least one first signal through the first filter to obtain a first frequency.

The first filter detects the frequency of the spurious signals in the received at least one first signal, and obtains the frequency of the spurious signals, namely the first frequency.

In practical applications, the first filter may detect a plurality of first frequencies from at least one first signal, that is, the at least one first signal includes a plurality of spurious signals, and at this time, the processing manners for different spurious signals may be the same.

S306, the electronic device sets the center frequency of the first filter to be the first frequency.

In some embodiments, the performing of S303 includes the steps of:

Respectively carrying out channel estimation on each second signal in the at least one second signal based on the first frequency to obtain at least one first channel estimation information; demodulating the at least one second signal based on the at least one first channel estimation information to obtain at least one third signal.

And after receiving at least one second signal, the channel estimation module carries out channel estimation on each second signal in the at least one second signal to obtain first channel estimation information corresponding to each second signal, thereby obtaining at least one first channel estimation information.

The channel estimation module sends at least one second signal and the first channel estimation information corresponding to each second signal to the demodulation module after determining at least one first channel estimation information.

After receiving at least one second signal and channel estimation information corresponding to each second signal, the demodulation module demodulates the at least one second signal based on the channel estimation information corresponding to each second channel in the at least one second signal to obtain at least one third signal.

In the embodiment of the present application, the relationship among the at least one second signal, the at least one first channel estimation information, and the at least one third signal may be represented by formula (2):

y=hest X formula (2);

Wherein Y is a matrix of at least one second signal, hest is a matrix of at least one first channel estimation information, and X is a matrix of at least one third signal.

In some embodiments, the channel estimating, based on the first frequency, each second signal in the at least one second signal to obtain at least one first channel estimation information includes: and if the first target signal is included in the at least one second signal, the frequency of a first pilot signal corresponding to the first target signal is the first frequency, determining a second pilot signal based on the first pilot signal corresponding to the second signal for each second signal in the at least one second signal, and performing channel estimation on the second signal based on the second pilot signal to obtain first channel estimation information corresponding to the second target signal.

The channel estimation module determines pilot signals corresponding to each second signal in at least one second signal, wherein the frequencies of the pilot signals of different second signals can be the same or different.

The channel estimation module compares the frequency of the pilot signal of each second signal in the at least one second signal with the first frequency to determine whether the at least one second signal includes a first target signal with the same frequency as the first frequency.

If the at least one second signal includes at least one first target signal, the channel estimation module performs the following processing on each first target signal: and determining a pilot signal of the first target signal, namely a first pilot signal, determining a pilot signal at a nearby position from a frequency direction or a time direction, determining a second pilot signal based on the pilot signal at the nearby position, and performing channel estimation on the first target signal through the second pilot signal to obtain first channel estimation information corresponding to the first target signal.

The manner in which the second pilot signal is determined based on the first pilot signal may include a variety of ways, such as: and taking the pilot signals adjacent to the position as a second pilot signal, and obtaining the second pilot signal through the difference value of the pilot signals adjacent to the position. In one example, the first pilot signal is H _i and the second pilot signal is H _i-1. In one example, the first pilot signal is H _i and the second pilot signal is H _i+1. In one example, the first pilot signal is H _i, then the second pilot signal is (H _i-1+H_i+1)/2, etc.

And if the at least one second signal does not comprise the first target signal, the channel estimation module carries out channel estimation on the corresponding second signal according to the pilot signal corresponding to the second signal for each second signal of the at least one second signal, and obtains channel first channel estimation information corresponding to the second signal.

In some embodiments, S303 determines at least one third signal based at least on the first frequency and the at least one second signal, comprising: if the at least one second signal includes a second target signal, the frequency of the data signal corresponding to the second target signal is the first frequency, and a third signal corresponding to each second signal in the at least one second signal is set as a first set value.

The channel estimation module determines data signals corresponding to each second signal in at least one second signal, wherein the frequencies of the data signals corresponding to different second signals can be the same or different.

The channel estimation module compares the frequency of the data signal corresponding to each second signal in the at least one second signal with the first frequency to determine whether the at least one second signal comprises a second target signal with the same frequency as the first frequency.

And if the at least one second signal comprises at least one second target signal, setting a third signal corresponding to each second signal in the at least one second signal as a first set value.

Here, the first set value may be 0.

In the embodiment of the present application, if at least one second signal includes at least one second target signal, the value of the third signal corresponding to each second signal may be set to the first set value by one of the following manners:

the first mode is to directly set the value of each third signal as a first set value;

In the second mode, the value of each third signal can be set to be the first set value through the channel estimation result of each second signal and the setting of each second signal.

In the first mode, the channel estimation module does not perform channel estimation on at least one second signal, the demodulation module does not demodulate at least one second signal, the demodulation module directly outputs third signals corresponding to the second signals, and the value of each third signal is a first set value.

In a second mode, the channel estimation module performs channel estimation on each second signal in the at least one second signal, the demodulation module demodulates the at least one second signal, and the setting of channel estimation information corresponding to each second signal and the setting of the second signal in the channel estimation result of the channel estimation module make each third signal be the first set value.

Taking the first set value as 0 as an example, in the first mode, the channel estimation module does not perform channel estimation on at least one second signal, and the demodulation module does not demodulate at least one second signal, and directly sets the value of each third signal to 0.

Taking the first set value as 0 as an example, in the second mode, after the channel estimation module performs channel estimation on at least one second signal, the channel estimation module sets the channel estimation information corresponding to each second channel to 0, and the demodulation module sets at least one second signal to 0, where the demodulation module obtains the value of each third signal to be 0.

In the embodiment of the application, when the influence of the spurious signals on the signals of which antenna cannot be confirmed, the third signals corresponding to the second signals are all set to the first set value, so that the residual spurious signals are processed in the baseband.

In some embodiments, prior to S303, further comprising the steps of: acquiring antenna indication information, wherein the antenna indication information is used for indicating at least one first antenna, and the first antenna is an antenna for generating the stray signals; correspondingly, S303 determines at least one third signal based at least on the first frequency and the at least one second signal, comprising: the at least one third signal is determined based on the antenna indication information, the first frequency, and the at least one second signal.

In the case that the electronic device determines the antenna indication information, the at least one third signal is determined based on the antenna indication information, the first frequency and the at least one second signal.

The antenna indication information indicates an antenna generating a spurious signal, and here, the antenna generating a spurious signal may be understood as including a spurious signal in a received signal of the antenna, i.e. the spurious signal is received by the antenna.

When the antenna indication information is received, the electronic device determines a second signal, namely a third target signal, influenced by the spurious signals based on the antenna indication information, and at this time, the electronic device performs channel estimation and demodulation on at least one second signal based on the antenna indication information and the first frequency to obtain at least one third signal.

In some embodiments, determining the at least one third signal based on the antenna indication information, the first frequency, and the at least one second signal comprises: determining a third target signal corresponding to each first antenna in at least one first antenna indicated by the antenna indication information in the at least one second signal; and determining a third signal corresponding to the third target signal according to the first frequency and the third target signal for the third target signal corresponding to each first antenna in at least one first antenna.

The electronic device performs channel estimation and demodulation on a third target signal, which is a second signal corresponding to the first antenna, based on the first frequency, and performs channel estimation and demodulation on a signal other than the third target signal in at least one second signal.

In one example, the receiver includes a receiving antenna: antenna 1, antenna 2, antenna 3, and antenna 4, the antenna indication information indicates that antenna 1 is the antenna that generated the spurious signals. At this time, the second signal corresponding to the antenna 1 is channel-estimated and demodulated based on the first frequency, and the second signals corresponding to the antennas 2, 3, and 4 are channel-estimated and demodulated irrespective of the first frequency.

As shown in fig. 7, the first filter 102 transmits the first frequency and antenna indication information to the channel estimation module 103 such that the channel estimation module 103 performs channel estimation on at least one second signal based on the first frequency and antenna indication information, and the first filter 102 transmits the first frequency and antenna indication information to the demodulation module 104 such that the demodulation module 104 demodulates the at least one second signal based on the first frequency and antenna indication information.

For at least one third target signal, the channel estimation module determines frequencies of pilot signals and data signals corresponding to each third target signal in the at least one third target signal, and for a third target signal, the channel estimation module performs channel estimation on the third target signal based on a relation between the first frequency and frequencies of the pilot signals and the data signals of the third target signal.

In the embodiment of the application, the signal influenced by the spurious signals can be definitely determined based on the antenna indication information, and in the process of performing channel estimation and demodulation, the residual spurious signals are processed only for the signal influenced by the spurious signals, and the residual spurious signals are not processed for the signal not influenced by the spurious signals, so that the residual spurious signals are processed in the baseband, and more useful receiving information is reserved as much as possible.

In some embodiments, the determining, according to the first frequency and the third target signal, a third signal corresponding to the third target signal includes: if the first frequency is the same as the frequency of the first pilot signal corresponding to the third target signal, determining a second pilot signal based on the first pilot signal; performing channel estimation on the third target signal based on the second pilot signal to obtain second channel estimation information; and demodulating the third target signal based on the second channel estimation information to obtain a third signal corresponding to the third target signal.

For a third target signal, if the frequency of the pilot signal corresponding to the third target signal is the same as the first frequency, the channel estimation module determines the pilot signal of the third target signal, namely the first pilot signal, determines the pilot signal of the adjacent position in the frequency direction or the time direction, namely the second pilot signal, and performs channel estimation on the third target signal through the second pilot signal to obtain second channel estimation information corresponding to the third target signal.

In some embodiments, the determining, according to the first frequency and the third target signal, a third signal corresponding to the third target signal includes: if the first frequency is the same as the frequency of the data signal corresponding to the third target signal, setting third channel estimation information corresponding to the third target signal as a second set value, and setting the third target signal as a third set value; and determining a third signal corresponding to the third target signal based on the third channel estimation information set to the second set value and the third target signal set to the third set value.

For a third target signal, if the frequency of the data signal corresponding to the third target signal is the same as the first frequency, the channel estimation module carries out channel estimation on the third target signal to obtain third channel estimation information, the value of the third channel estimation information is set to be a second set value, and a third signal corresponding to the third target signal is determined based on the third channel estimation information with the value of the second set value and the third target signal with the value of the third set value.

In an embodiment of the present application, the setting of the third target signal to the third set value includes at least one of:

The method A is that a channel estimation module sets the value of a third target signal to a third set value before transmitting the third target signal, and at the moment, the channel estimation module transmits the third target signal set to the third set value to a demodulation module; a step of

And in the mode B, after receiving the third target signal sent by the channel estimation module, the demodulation module sets the value of the third target signal to a third set value.

In the embodiment of the present application, the second set value may be 0 or 1, the third set value may be 0 or 1, and the second set value and the third set value may be the same or different.

In an example, the second set value is 0, the third set value is 1, and at this time, the value of the third signal corresponding to the obtained third target signal is 0.

In an example, the second set value is 1, the third set value is 0, and at this time, the value of the third signal corresponding to the obtained third target signal is 0.

In an example, the second set value is 0, the third set value is 0, and at this time, the value of the third signal corresponding to the obtained third target signal is 0.

In the embodiment of the application, under the condition that the frequency of the data signal of the third target signal is the same as the first frequency, the demodulation result of the third target signal is set under the condition that the channel estimation and demodulation of other second signals except the third target signal in at least one second signal are not influenced, so that the influence of residual spurious signals on the third target signal is eliminated.

The signal processing method provided by the embodiment of the application is further described below.

Since the operation system of the receiver includes GSM, WCDMA, LTE, NR, WIFI, and the like, the diversity of the operation frequencies and the connection between the physical components are tight, so that harmonic signals from the clock, i.e., spurious signals of the clock signal, and clock signals may appear as harmful frequency signals within the bandwidth of the received signal. This can have at least two deleterious consequences. The first case is: due to substrate coupling between components, harmonic signals may leak into the phase locked loop and may fall around the transmission frequency, and if spurious signals and resonant signals fall around the transmission frequency, the receiver may demodulate the received spurious signals into the receiver path, resulting in a reduced signal-to-noise ratio of the receiver. The second case is when the spurious signal is directly coupled to the receiver path, resulting in the desired noise signal being thermal plus spurious noise.

In an example, the structure of the receiver is as shown in fig. 8, including: an antenna (Ant) 801, a Low noise amplifier (Low noise amplifier, LNA) 802, a Mixer (Mixer) 803, a Low pass filter (Low-PASS FILTER, LPF) 804, an analog-to-digital converter (ADF) 805, a Digital Front End (DFE) 806, a channel estimation module (EST) 807, a demodulation module (DEM) 808, and a decoding module (DEC) 809. Where the clock signal generated by clock 810 may cause spurious signals.

The receiver may use active techniques to mitigate spurs. The principle of spurious mitigation by active technology is: the spurious levels are reduced from frequency planning to clock spread integration considerations, thereby reducing the resultant contaminating interference.

However, the diversity of standard formats supported has led to an ever-increasing stray source (which is associated with an ever-increasing operating frequency) and passive cancellation has become more difficult. Meanwhile, the radio frequency transceiver comprises more and more digital parts, and the signal processing technology is becoming a concern area of radio frequency damage. In the related art, an active spurious cancellation method based on a band-pass filter (band-PASS FILTER, BPF) technology or a signal processing algorithm is proposed, and the idea of the method is as follows: if the spurious signal falls into the receiving frequency band with a higher amplitude, the interfered receiver system needs to design a band-pass filter, and the band-pass filter is mainly used for limiting a specific frequency to attenuate a certain amount of amplitude, and meanwhile, the out-of-band loss is smaller. As shown in fig. 9, a BPF901 is added between the ADC805 and the DFE 806.

As can be seen from the receiver shown in fig. 9, the higher power spurious signals are filtered out. However, in practical systems, it is difficult to implement a bandpass filter, and at the same time, the effect of very narrow stop band and extremely large filter loss is achieved. Two situations can occur:

In case one, the stop band is very narrow, but the filtering loss is not large enough. Although the useful signal in the passband is not affected, the aim of completely suppressing spurious signals cannot be achieved.

In the second case, the stop band filter loss is particularly large (spurious signals are completely suppressed), but the stop band is relatively wide, so that the pass band loss is relatively large. Thus, the useful signal in the passband is damaged, affects the SNR, and ultimately affects the demodulation performance.

In summary, in the related art, it is difficult to achieve the effect of well suppressing the spurious signals without affecting the useful signal of the passband.

The signal processing method provided by the embodiment of the present application can be implemented to include, but is not limited to, the following first embodiment and the second embodiment.

Example 1

In the embodiment of the present application, as shown in fig. 10, a notch (notch) filter 1001 is added between the analog-to-digital converter 805 and the data front end 806, so that a notch filter with very narrow stop band but insufficient filtering loss is adopted, and meanwhile, the frequency position information of the detected spurious signals is notified to the EST and DEM. The Notch filter is mainly characterized in that the frequency position of spurious signals is detected, then the center frequency point of the BPF is located at the position of the spurious signals, spurious signals with higher power are filtered, and meanwhile signals at the bandwidth positions of other non-spurious signals are not affected.

As shown in fig. 10, the digital front end 806 transmits the position information of the spurious signals detected by the notch filter, that is, the first frequency, to the channel estimation module 807 and the demodulation module 808, respectively.

If the frequency position affected by the spurious signals is a pilot signal, the EST adopts the pilot signal at the adjacent position to replace the pilot signal at the current pilot position in the process of channel estimation filtering and interpolation.

The pilot signal in the vicinity refers to a pilot signal adjacent to the current pilot in the frequency direction or the time direction.

The principle of channel estimation is filtering, and the filtering matrix is multiplied by pilot signals in a certain time-frequency range to obtain channel estimation information.

In one example, the channel estimation process may be expressed as equation (1):

hest=sum (W _i*H_i), i=0,..n-1. Formula (1)

Here, if a pilot signal H _i is interfered with and a nearby pilot signal is needed, it means that H _i no longer participates in filtering, and is replaced by H _i+1、H_i-1、(H_i+1+H_i-1)/2 or other means.

If the frequency location affected by the spurious signals is a data signal, the DEM does not calculate the log likelihood ratio (log likelihood ratio, LLR) at the frequency location affected by the spurious signals, and directly sets the LLR to 0 for processing and outputs to a decoding module (DEC).

Example two

In the embodiment of the present application, as shown in fig. 11, a notch (notch) filter 1001 is added between the analog-to-digital converter 805 and the data front end 806, so that a notch filter with very narrow stop band but insufficient filtering loss is adopted, and meanwhile, the frequency position information of the detected spurious signals and the receiving antenna information for generating the spurious signals are notified to the EST and the DEM. Wherein the receiving antenna information for generating spurious signals includes: information of the receiving antenna subjected to the spurious interference, and carrier frequency position subjected to the spurious interference.

As shown in fig. 11, the digital front end 806 transmits the position information of the spurious signals detected by the notch filter, that is, the first frequency and the antenna indication information, that is, the antenna indication information, to the channel estimation module 807, and transmits the first frequency and the antenna indication information to the demodulation module 808.

If the current receiving antenna is affected by the spurious signals and the frequency position affected by the spurious signals is a pilot signal, the EST adopts the pilot signal at the adjacent position to replace the pilot signal at the current pilot position in the process of channel estimation filtering and interpolation.

If the current receiving antenna is affected by the spurious signals and the frequency position affected by the spurious signals is a data signal, the EST does not perform channel estimation interpolation on the frequency position affected by the spurious signals, the channel estimation information of the position is directly set to 0, the DEM sets the receiving signal to 0, and the receiving signal and the channel estimation set to 0 are used for calculating LLR and outputting the LLR to the DEC.

In the embodiment of the application, scheme 1 has no way to distinguish which antenna is affected by the spurious, so that all antennas do not calculate LLR, and LLR is given to 0. In scheme 2, the antenna affected by the spurious does not calculate the LLR.

Note that the EST and DEM are normally processed on the receive antenna unaffected by spurious signals, and the received signal and channel estimate information are not set to 0.

The signal processing method provided by the embodiment of the application adopts the notch filter with very narrow stop band and insufficient filtering loss, and aims to avoid damaging useful received signals in the pass band. Meanwhile, in the baseband, different processing modes are adopted according to whether the notch filtering can distinguish the receiving antennas.

In the embodiment of the application, two schemes are provided, namely a notch filter with very narrow stop band and insufficient filtering loss is adopted, so that useful received signals in the pass band are not damaged.

If it is impossible to distinguish the receiving antennas for notch filtering, the first embodiment of the present application may be adopted, that is, the frequency location information of the detected spurious signals is notified to the EST and DEM. This allows processing of the residual spurious signals in the baseband. FIG. 12 is a comparison of performance of the first embodiment of the present application and a signal processing method not according to the embodiment of the present application; here, 1201 is a relation between a block error rate (BLER) and a SIGNAL-to-NOISE RATIO (SNR) in the case of no spurious SIGNALs, 1202 is a relation between a BLER and an SNR in the case of adopting the first technical solution, and 1203 is a relation between a BLER and an SNR in the case of not adopting the SIGNAL processing method provided by the embodiment of the present application.

If it is possible to distinguish the receiving antennas for notch filtering, the second embodiment of the present application may be adopted, that is, the frequency location information of the detected spurious signals and the receiving antenna information for generating the spurious signals are notified to the EST and the DEM. This allows processing of the residual spurious signals in the baseband while retaining as much useful received information as possible. FIG. 13 is a comparison of performance of a second embodiment of the present application and a signal processing method not according to the present application; wherein 1301 is the relationship between the BLER and the SNR in the case of no spurious signal, 1302 is the relationship between the BLER and the SNR in the case of adopting the second technical solution, and 1303 is the relationship between the BLER and the SNR in the case of not adopting the signal processing method provided by the embodiment of the present application.

A signal processing apparatus according to an embodiment of the present application, which is applied to an electronic device, may be implemented as a receiver, as shown in fig. 14, and a signal processing apparatus 1400 includes:

An analog-to-digital conversion module 1401 configured to input at least one first signal output by the analog-to-digital converter to the first filter;

A filtering module 1402, configured to filter each first signal in the at least one first signal by using the first filter to obtain at least one second signal, where the second signal is a signal attenuated at a first frequency corresponding to the first signal, and the first frequency is a frequency of a spurious signal in the at least one first signal;

An estimated demodulation module 1403 configured to determine at least one third signal based at least on the first frequency and the at least one second signal, where each third signal in the at least one third signal is a signal obtained by performing channel estimation and demodulation on a corresponding second signal;

a decoding module 1404 configured to decode the at least one third signal.

In some embodiments, the signal processing apparatus 1400 further comprises:

A detection module configured to detect a frequency position of a spurious signal in the at least one first signal by the first filter, resulting in the first frequency;

And a setting module configured to set a center frequency of the first filter to the first frequency.

In some embodiments, the estimation demodulation module 1403 is further configured to:

Respectively carrying out channel estimation on each second signal in the at least one second signal based on the first frequency to obtain at least one first channel estimation information;

Demodulating the at least one second signal based on the at least one first channel estimation information to obtain at least one third signal.

And if the first target signal is included in the at least one second signal, the frequency of a first pilot signal corresponding to the first target signal is the first frequency, determining a second pilot signal based on the first pilot signal corresponding to the second signal for each second signal in the at least one second signal, and performing channel estimation on the second signal based on the second pilot signal to obtain first channel estimation information corresponding to the second target signal.

If the at least one second signal includes a second target signal, the frequency of the data signal corresponding to the second target signal is the first frequency, and a third signal corresponding to each second signal in the at least one second signal is set as a first set value.

In some embodiments, the apparatus 1400 further comprises:

The acquisition module is configured to acquire antenna indication information, wherein the antenna indication information is used for indicating at least one first antenna, and the first antenna is an antenna for generating the stray signals;

Correspondingly, the estimation demodulation module 1403 is further configured to determine the at least one third signal based on the antenna indication information, the first frequency and the at least one second signal.

determining a third target signal corresponding to each first antenna in at least one first antenna indicated by the antenna indication information in the at least one second signal;

And determining a third signal corresponding to the third target signal according to the first frequency and the third target signal for the third target signal corresponding to each first antenna in at least one first antenna.

if the first frequency is the same as the frequency of the first pilot signal corresponding to the third target signal, determining a second pilot signal based on the first pilot signal;

And carrying out channel estimation on the third target signal based on the second pilot signal to obtain second channel estimation information. ;

And demodulating the third target signal based on the second channel estimation information to obtain a third signal corresponding to the third target signal.

If the first frequency is the same as the frequency of the data signal corresponding to the third target signal, setting third channel estimation information corresponding to the third target signal as a second set value, and setting the third target signal as a third set value;

And determining a third signal corresponding to the third target signal based on the third channel estimation information set to the second set value and the third target signal set to the third set value.

In practical applications, the analog-to-digital conversion module 1401, the filtering module 1402, the estimation and demodulation module 1403, the decoding module 1404, the detection module, the setting module, and the acquisition module may be implemented by a processor located on an electronic device, specifically, a central Processing Unit (CPU, centralProcessing Unit), a microprocessor (MPU, microprocessor Unit), a digital signal processor (DSP, digital Signal Processing), or a field programmable gate array (FPGA, field Programmable GATE ARRAY), etc. In practical applications, the processor in the electronic device may be implemented as a receiver.

Wherein the analog-to-digital conversion module 1401 may be implemented by an analog-to-digital converter in the receiver, the filtering module 1402 may be implemented by a first filter in the receiver, the estimation and demodulation 1403 may be implemented by a channel estimation module and a demodulation module in the receiver, the decoding module 1404 may be implemented by a decoder in the receiver, and the detection module and the setting module may be implemented by the first filter in the receiver. In practical applications, the first filter may be embedded in the digital front end.

In practical applications, a receiver may be included in an electronic device, the receiver configured to:

the at least one third signal is decoded.

The analog-to-digital conversion module 1401 may be implemented by an analog-to-digital converter in the receiver, the detection module, the setting module, the filtering module 1402 may be implemented by a first filter in the receiver, the estimation demodulation module 1403 may be implemented by a channel estimation module and a demodulation module in the receiver, and the decoding module 1404 may be implemented by a decoding module in the receiver.

It should be understood by those skilled in the art that the above description of the signal processing apparatus according to the embodiment of the present application may be understood with reference to the description of the signal processing method according to the embodiment of the present application.

Fig. 15 is a schematic structural diagram of an alternative electronic device according to an embodiment of the present application, and as shown in fig. 15, an electronic device 1500 is provided according to an embodiment of the present application, including an electronic chip 1501, which can be implemented as a receiver according to one or more embodiments described above.

The structure of the receiver may be as shown in fig. 14, including:

a decoding module 1404 configured to decode the at least one third signal.

An embodiment of the present application provides an electronic device, and fig. 16 is a schematic structural diagram of another alternative electronic device provided in the embodiment of the present application, as shown in fig. 16, and in this embodiment of the present application, an electronic device 1600 is provided, including:

A processor 161 and a storage medium 162 storing instructions executable by the processor 161, the storage medium 1262 performing operations in dependence on the processor 161 through a communication bus 163, the instructions, when executed by the processor 161, performing the signal processing method performed in one or more embodiments described above.

In practical use, the components in the terminal are coupled together via the communication bus 123. It is understood that the communication bus 163 is used to enable connected communication between these components. The communication bus 163 includes a power bus, a control bus, and a status signal bus in addition to the data bus. But for clarity of illustration the various buses are labeled as communication bus 163 in fig. 16.

Embodiments of the present application provide a computer storage medium for storing a computer program that causes a computer to perform the steps of the signal processing method according to one or more embodiments described above.

An embodiment of the application provides a schematic block diagram of an electronic device 1700. The electronic device may be a receiving device. The electronic device 1700 shown in fig. 17 includes a processor 1710.

In the case where the electronic device is a receiving device, the processor 1710 is configured to:

the at least one third signal is decoded.

In the embodiment of the present application, the processor 1710 may call and run a computer program from the memory to implement the signal processing method in the embodiment of the present application.

Optionally, as shown in fig. 17, the electronic device 1700 may also include a memory 1720. The processor 1710 may call and execute a computer program from the memory 1720 to implement the signal processing method according to the embodiment of the present application.

Wherein the memory 1720 may be a separate device from the processor 1710 or may be integrated in the processor 1710.

Optionally, as shown in fig. 17, the electronic device 1700 may further include a transceiver 1730, and the processor 1710 may control the transceiver 1730 to communicate with other devices, and in particular, may receive signals transmitted by other devices.

Wherein transceiver 1730 may include a receiver. Wherein the number of antennas in the receiver may be one or more.

Optionally, the electronic device 1700 may implement a corresponding flow implemented by the electronic device in each method of the embodiments of the present application, which is not described herein for brevity. Alternatively, the electronic device 1700 may be a terminal device or a network device.

It should be appreciated that the processor of an embodiment of the present application may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be implemented by integrated logic circuits of hardware in a processor or instructions in software form. The Processor may be a general purpose Processor, a digital signal Processor (DIGITAL SIGNAL Processor, DSP), an application specific integrated circuit (ApplicationSpecific Integrated Circuit, ASIC), an off-the-shelf programmable gate array (Field Programmable GATE ARRAY, FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be embodied directly in the execution of a hardware decoding processor, or in the execution of a combination of hardware and software modules in a decoding processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.

It will be appreciated that the memory in embodiments of the application may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM) which acts as external cache memory. By way of example, and not limitation, many forms of RAM are available, such as static random access memory (STATIC RAM, SRAM), dynamic random access memory (DYNAMIC RAM, DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate Synchronous dynamic random access memory (Double DATA RATE SDRAM, DDR SDRAM), enhanced Synchronous dynamic random access memory (ENHANCED SDRAM, ESDRAM), synchronous link dynamic random access memory (SYNCHLINK DRAM, SLDRAM), and Direct memory bus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be appreciated that the above memory is exemplary and not limiting, and for example, the memory in the embodiments of the present application may be static random access memory (STATIC RAM, SRAM), dynamic random access memory (DYNAMIC RAM, DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate synchronous dynamic random access memory (double DATA RATE SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (ENHANCED SDRAM, ESDRAM), synchronous connection dynamic random access memory (SYNCH LINK DRAM, SLDRAM), direct Rambus RAM (DR RAM), and the like. That is, the memory in embodiments of the present application is intended to comprise, without being limited to, these and any other suitable types of memory.

The embodiment of the application also provides a computer readable storage medium for storing a computer program.

Optionally, the computer readable storage medium may be applied to the electronic device in the embodiment of the present application, and the computer program causes a computer to execute a corresponding flow implemented by the electronic device in each method of the embodiment of the present application, which is not described herein for brevity.

The embodiment of the application also provides a computer program product comprising computer program instructions.

Optionally, the computer program product may be applied to an electronic device in the embodiment of the present application, and the computer program instructions cause the computer to execute a corresponding flow implemented by the electronic device in each method in the embodiment of the present application, which is not described herein for brevity.

The embodiment of the application also provides a computer program.

Optionally, the computer program may be applied to the electronic device in the embodiment of the present application, and when the computer program runs on a computer, the computer is caused to execute a corresponding flow implemented by the electronic device in each method in the embodiment of the present application, which is not described herein for brevity.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within 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

1. A method of signal processing, the method comprising:

the at least one third signal is decoded.

2. The method of claim 1, wherein prior to filtering each of the at least one first signal by the first filter to obtain at least one second signal, the method further comprises:

Detecting the frequency position of the spurious signals in the at least one first signal through the first filter to obtain the first frequency;

the center frequency of the first filter is set to the first frequency.

3. The method of claim 1, wherein the determining at least one third signal based at least on the first frequency and the at least one second signal comprises:

4. The method of claim 3, wherein the channel estimating each of the at least one second signal based on the first frequency to obtain at least one first channel estimation information comprises:

If the at least one second signal includes a first target signal, a frequency of a pilot signal corresponding to the first target signal is the first frequency, for each second signal in the at least one second signal, determining a second pilot signal based on the first pilot signal corresponding to the second signal, and performing channel estimation on the second signal based on the second pilot signal to obtain first channel estimation information corresponding to the second target signal.

5. The method of claim 1, wherein the determining at least one third signal based at least on the first frequency and the at least one second signal comprises:

6. The method according to claim 1, wherein the method further comprises:

acquiring antenna indication information, wherein the antenna indication information is used for indicating at least one first antenna, and the first antenna is an antenna for generating the stray signals;

Correspondingly, determining at least one third signal based at least on the first frequency and the at least one second signal, comprising:

The at least one third signal is determined based on the antenna indication information, the first frequency, and the at least one second signal.

7. The method of claim 6, wherein determining the at least one third signal based on the antenna indication information, the first frequency, and the at least one second signal comprises:

8. The method of claim 7, wherein determining a third signal corresponding to the third target signal based on the first frequency and the third target signal comprises:

Performing channel estimation on the third target signal based on the second pilot signal to obtain second channel estimation information;

9. The method of claim 7, wherein determining a third signal corresponding to the third target signal based on the first frequency and the third target signal comprises:

10. A receiver, the receiver comprising:

And the decoding module is used for decoding the at least one third signal.

11. An electronic device comprising a receiver as claimed in claim 10.

12. An electronic device comprising a receiver, wherein the receiver is configured to:

the at least one third signal is decoded.

13. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the signal processing method according to any of claims 1 to 9 when the computer program is executed by the processor.

14. A storage medium storing an executable program, wherein the executable program, when executed by a processor, implements the signal processing method of any one of claims 1 to 9.