CN113067586B

CN113067586B - Method, device and equipment for determining intermediate frequency position

Info

Publication number: CN113067586B
Application number: CN202110296902.4A
Authority: CN
Inventors: 陈剑翔; 王大伟; 李巧雅; 赵强
Original assignee: Spreadtrum Semiconductor Nanjing Co Ltd
Current assignee: Spreadtrum Semiconductor Nanjing Co Ltd
Priority date: 2021-03-19
Filing date: 2021-03-19
Publication date: 2022-09-20
Anticipated expiration: 2041-03-19
Also published as: CN113067586A

Abstract

The application provides a method, a device and equipment for determining an intermediate frequency position, wherein the method comprises the following steps: acquiring a radio frequency signal received by a current subframe, wherein the radio frequency signal has a central frequency, and acquiring first adjacent channel interference energy and second adjacent channel interference energy corresponding to the current subframe according to the radio frequency signal, wherein the first adjacent channel interference energy represents energy of an interference signal of which the frequency is smaller than the central frequency in the radio frequency signal, and the second adjacent channel interference energy represents energy of an interference signal of which the frequency is greater than the central frequency in the radio frequency signal; and determining the intermediate frequency position corresponding to the next subframe according to the first adjacent frequency interference energy and the second adjacent frequency interference energy corresponding to the current subframe. In the process, the intermediate frequency position of the next subframe is dynamically adjusted according to the adjacent frequency interference distribution condition of the current subframe, so that the effect of inhibiting the adjacent frequency interference can be improved, the receiving sensitivity of the terminal equipment is improved, and the receiving error rate is reduced.

Description

Method, device and equipment for determining intermediate frequency position

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method, an apparatus, and a device for determining an intermediate frequency position.

Background

With the development of mobile communication technology, communication networks with various network standards coexist, and wireless channel resources are gradually in short supply, so that adjacent channel interference exists in downlink reception of terminal equipment, which results in low reception sensitivity and high reception error rate of the terminal equipment.

In general, a mixer is provided in a receiver of a terminal device, and a local oscillator and an intermediate frequency filter are provided in the mixer. The local oscillator is used for generating local oscillation signals, the frequency mixer carries out frequency mixing processing on the high-frequency radio-frequency signals received from the antenna and the local oscillation signals to convert the high-frequency radio-frequency signals and the local oscillation signals into intermediate-frequency signals, and the intermediate-frequency signals are filtered by the intermediate-frequency filter. In the prior art, the mixer may be configured with an intermediate frequency location, which is a frequency location where the center frequency of the radio frequency signal is converted into the intermediate frequency signal. Therefore, the intermediate frequency filter can carry out filtering according to the intermediate frequency position, so that the weak edge of the intermediate frequency filter can weaken signals beyond the central frequency, and the purpose of inhibiting adjacent frequency interference is achieved.

However, how to determine the if position of the mixer to suppress the adjacent channel interference is an urgent technical problem to be solved.

Disclosure of Invention

The application provides a method, a device and equipment for determining an intermediate frequency position, which are used for inhibiting adjacent frequency interference and improving the receiving sensitivity of terminal equipment.

In a first aspect, the present application provides a method for determining an intermediate frequency position, including:

acquiring a radio frequency signal received by a current subframe, wherein the radio frequency signal has a central frequency;

acquiring first adjacent channel interference energy and second adjacent channel interference energy corresponding to the current subframe according to the radio frequency signal, wherein the first adjacent channel interference energy represents energy of interference signals of which the frequency is smaller than the central frequency in the radio frequency signal, and the second adjacent channel interference energy represents energy of interference signals of which the frequency is greater than the central frequency in the radio frequency signal;

determining the intermediate frequency position corresponding to the next subframe according to the first adjacent frequency interference energy and the second adjacent frequency interference energy corresponding to the current subframe; the intermediate frequency position corresponding to one subframe indicates the frequency position of the center frequency in the intermediate frequency signal corresponding to the radio frequency signal received by the subframe.

In a possible implementation manner, determining an intermediate frequency position corresponding to a next subframe according to a first adjacent channel interference energy and a second adjacent channel interference energy corresponding to the current subframe includes:

acquiring the error rate of the current subframe according to the radio frequency signal;

and determining the intermediate frequency position corresponding to the next subframe according to the error rate of the current subframe, the intermediate frequency position of the current subframe, and the first adjacent frequency interference energy and the second adjacent frequency interference energy corresponding to the current subframe.

In a possible implementation manner, determining an intermediate frequency position corresponding to the next subframe according to the error rate of the current subframe, the intermediate frequency position of the current subframe, and the first adjacent channel interference energy and the second adjacent channel interference energy corresponding to the current subframe includes:

determining a first intermediate frequency position according to first adjacent frequency interference energy and second adjacent frequency interference energy corresponding to the current subframe;

determining a second intermediate frequency position according to the error rate of the current subframe and the intermediate frequency position of the current subframe;

and determining the intermediate frequency position corresponding to the next subframe according to the first intermediate frequency position and the second intermediate frequency position.

In a possible implementation manner, determining a first intermediate frequency position according to a first adjacent channel interference energy and a second adjacent channel interference energy corresponding to the current subframe includes:

if the first adjacent channel interference energy corresponding to the current subframe is smaller than the second adjacent channel interference energy corresponding to the current subframe, determining that the frequency corresponding to the first intermediate frequency position is smaller than zero; alternatively, the first and second liquid crystal display panels may be,

if the first adjacent channel interference energy corresponding to the current subframe is larger than the second adjacent channel interference energy corresponding to the current subframe, determining that the frequency corresponding to the first intermediate frequency position is larger than zero; alternatively, the first and second electrodes may be,

and if the first adjacent channel interference energy corresponding to the current subframe is equal to the second adjacent channel interference energy corresponding to the current subframe, determining that the first intermediate frequency position is the same as the intermediate frequency position corresponding to the current subframe.

In a possible implementation manner, if the first adjacent channel interference energy corresponding to the current subframe is less than the second adjacent channel interference energy corresponding to the current subframe, determining that the frequency corresponding to the first intermediate frequency position is less than zero includes:

if the first adjacent channel interference energy corresponding to the current subframe is less than the second adjacent channel interference energy corresponding to the current subframe, and the first adjacent channel interference energy corresponding to each subframe in the first subframe set is less than the second adjacent channel interference energy corresponding to the subframe, determining that the frequency corresponding to the first intermediate frequency position is less than zero;

if the first adjacent channel interference energy corresponding to the current subframe is greater than the second adjacent channel interference energy corresponding to the current subframe, determining that the frequency corresponding to the first intermediate frequency position is greater than zero, including:

if the first adjacent channel interference energy corresponding to the current subframe is larger than the second adjacent channel interference energy corresponding to the current subframe, and the first adjacent channel interference energy corresponding to each subframe in the first subframe set is larger than the second adjacent channel interference energy corresponding to the subframe, determining that the frequency corresponding to the first intermediate frequency position is larger than zero;

wherein the first set of subframes includes: a first preset number of subframes before the current subframe.

In one possible implementation manner, determining the second if position according to the error rate of the current subframe and the if position of the current subframe includes:

acquiring an error rate of a first historical subframe according to the intermediate frequency position of the current subframe, wherein the first historical subframe is a historical subframe which is closest to the current subframe in a plurality of historical subframes, and the intermediate frequency positions of the plurality of historical subframes are different from the intermediate frequency position of the current subframe;

if the error rate of the current subframe is greater than the error rate of the first historical subframe, determining the intermediate frequency position of the first historical subframe as the second intermediate frequency position;

and if the error rate of the current subframe is less than or equal to the error rate of the first historical subframe, determining the intermediate frequency position of the current subframe as the second intermediate frequency position.

In one possible implementation manner, if the error rate of the current subframe is greater than the error rate of the first historical subframe, determining the if position of the first historical subframe as the second if position includes:

and if the error rate of the current subframe is greater than the error rate of a first historical subframe, and the absolute value of the difference between the error rate of the current subframe and the error rate of the first historical subframe is greater than a first threshold, determining the intermediate frequency position of the first historical subframe as the second intermediate frequency position.

In a possible implementation manner, determining an intermediate frequency position corresponding to the next subframe according to the first intermediate frequency position and the second intermediate frequency position includes:

if the first intermediate frequency position is the same as the second intermediate frequency position, determining the first intermediate frequency position as an intermediate frequency position corresponding to the next subframe;

if the first intermediate frequency position is different from the second intermediate frequency position, respectively acquiring the reliability of the first intermediate frequency position and the reliability of the second intermediate frequency position;

and determining one of the first intermediate frequency position and the second intermediate frequency position with high reliability as the intermediate frequency position corresponding to the next subframe.

In a possible implementation manner, acquiring first adjacent channel interference energy and second adjacent channel interference energy corresponding to the current subframe according to the radio frequency signal includes:

carrying out Fourier transform processing on the radio frequency signal to obtain frequency domain data corresponding to the radio frequency signal;

acquiring energy of each first frequency and energy of each second frequency according to the frequency domain data, wherein the first frequency is smaller than the central frequency, and the second frequency is larger than the central frequency;

carrying out weighted summation on the energy of each first frequency to obtain the first adjacent channel interference energy;

and carrying out weighted summation on the energy of each second frequency to obtain the second adjacent channel interference energy.

In a possible implementation manner, obtaining the error rate of the current subframe according to the radio frequency signal includes:

demodulating the radio frequency signal to obtain a demodulated signal;

carrying out equalization processing on the demodulated signal to obtain soft bits of error codes;

and obtaining the error rate of the current subframe according to the soft bit of the error code.

In a second aspect, the present application provides an apparatus for determining an intermediate frequency position, including:

the device comprises an acquisition module, a processing module and a processing module, wherein the acquisition module is used for acquiring a radio frequency signal received by a current subframe, and the radio frequency signal has a central frequency;

a processing module, configured to obtain, according to the radio frequency signal, first adjacent channel interference energy and second adjacent channel interference energy corresponding to the current subframe, where the first adjacent channel interference energy represents energy of an interference signal of the radio frequency signal whose frequency is smaller than the center frequency, and the second adjacent channel interference energy represents energy of an interference signal of the radio frequency signal whose frequency is greater than the center frequency;

the processing module is further configured to determine an intermediate frequency position corresponding to a next subframe according to the first adjacent channel interference energy and the second adjacent channel interference energy corresponding to the current subframe; the intermediate frequency position corresponding to one subframe indicates the frequency position of the center frequency in the intermediate frequency signal corresponding to the radio frequency signal received by the subframe.

In a possible implementation manner, the processing module is specifically configured to:

if the first adjacent channel interference energy corresponding to the current subframe is smaller than the second adjacent channel interference energy corresponding to the current subframe, determining that the frequency corresponding to the first intermediate frequency position is smaller than zero; alternatively, the first and second electrodes may be,

and if the error rate of the current subframe is greater than the error rate of a first historical subframe, and the absolute value of the difference between the error rate of the current subframe and the error rate of the first historical subframe is greater than a first threshold value, determining the intermediate frequency position of the first historical subframe as the second intermediate frequency position.

demodulating the radio frequency signal to obtain a demodulated signal;

In a third aspect, the present application provides a terminal device, including: a transceiver, a processor, and a memory;

the memory stores computer-executable instructions;

the processor executes computer-executable instructions stored by the memory, causing the processor to perform the method of any of the first aspects.

In a fourth aspect, the present application provides a computer-readable storage medium having stored thereon computer-executable instructions for implementing the method according to any one of the first aspect when the computer-executable instructions are executed by a processor.

In a fifth aspect, the present application provides a computer program product comprising a computer program which, when executed by a processor, performs the method of any one of the first aspects.

The application provides a method, a device and equipment for determining an intermediate frequency position, wherein the method comprises the following steps: acquiring a radio frequency signal received by a current subframe, wherein the radio frequency signal has a central frequency, and acquiring first adjacent channel interference energy and second adjacent channel interference energy corresponding to the current subframe according to the radio frequency signal, wherein the first adjacent channel interference energy represents energy of an interference signal of which the frequency is less than the central frequency in the radio frequency signal, and the second adjacent channel interference energy represents energy of an interference signal of which the frequency is greater than the central frequency in the radio frequency signal; and determining the intermediate frequency position corresponding to the next subframe according to the first adjacent frequency interference energy and the second adjacent frequency interference energy corresponding to the current subframe. In the process, the intermediate frequency position of the next subframe is dynamically adjusted according to the adjacent frequency interference distribution condition of the current subframe, so that the effect of inhibiting the adjacent frequency interference can be improved, the receiving sensitivity of the terminal equipment is improved, and the receiving error rate is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present application;

fig. 2 is a schematic flowchart of a method for determining an intermediate frequency position according to an embodiment of the present disclosure;

fig. 3 is a schematic flowchart of another intermediate frequency position determining method according to an embodiment of the present disclosure;

fig. 4 is a schematic flowchart of another method for determining an intermediate frequency position according to an embodiment of the present application;

fig. 5 is a schematic diagram of a process for determining an intermediate frequency position according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of an apparatus for determining an intermediate frequency position according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the above-described drawings (if any) are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

For ease of understanding, first, the concepts related to the present application will be explained.

The terminal equipment: the terminal equipment can be deployed on land, including indoors or outdoors, and is handheld, wearable or vehicle-mounted; can also be deployed on the water surface (such as a ship and the like); and may also be deployed in the air (e.g., airplanes, balloons, satellites, etc.). The terminal device may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a vehicle-mounted terminal device, a wireless terminal in self driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety, a wireless terminal in city (smart city), a wireless terminal in smart home (smart home), a wearable terminal device, and the like. The terminal device according to the embodiment of the present application may also be referred to as a terminal, a User Equipment (UE), an access terminal device, a vehicle-mounted terminal, an industrial control terminal, a UE unit, a UE station, a mobile station, a remote terminal device, a mobile device, a UE terminal device, a wireless communication device, a UE agent, or a UE apparatus. The terminal equipment may also be fixed or mobile.

A network device: may be a device for communicating with a mobile device. The network device may be an Access Point (AP) in a WLAN, a base station (BTS) in GSM or CDMA, a base station (nodeB, NB) in WCDMA, an evolved node B (eNB or eNodeB) in LTE, a relay station or an access point, or a network device (gNB) in a vehicle-mounted device, a wearable device, and an NR network, or a network device in a future evolved Public Land Mobile Network (PLMN), or the like.

Baseband signal: the original electrical signal, which is sent from the source (information source, also called transmitter) without modulation (e.g. spectral shifting and conversion), is characterized by a low frequency, and the signal spectrum has a low-pass form starting from near zero frequency.

Radio frequency signal: refers to a modulated electric wave having a certain transmission frequency.

Intermediate frequency signals: which is a signal obtained by frequency-converting a high-frequency signal. In order to make the amplifier operate stably and reduce interference, a general receiver converts a high frequency signal into an intermediate frequency signal. The intermediate frequency signal is a bridge for the transition between baseband and radio frequency.

Intermediate frequency position: the radio frequency signal has a center frequency that is converted to a frequency location in the intermediate frequency signal after the radio frequency signal is converted to the intermediate frequency signal. For example, the intermediate frequency position may be to the left or right of the zero frequency position of the intermediate frequency signal. The "intermediate frequency position is on the left side of the zero frequency position" may also be referred to as "the frequency corresponding to the intermediate frequency position is less than zero"; the "intermediate frequency position to the right of the zero frequency position" may also be referred to as "the intermediate frequency position corresponds to a frequency greater than zero".

A communication system to which the present application is applicable will first be described with reference to fig. 1.

Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present application. Referring to fig. 1, the communication system includes a network device 101 and a terminal device 102, and wireless communication is performed between the network device and the terminal device. The communication system may include: a global system for mobile communications (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a Long Term Evolution (LTE) system, or a 5th-generation (5G) system. Of course, the communication system may be other, and this is not particularly limited in this embodiment of the present application.

With the development of mobile communication technology, communication networks of various network standards coexist, including but not limited to: GSM, WCDMA, LTE, etc., make the radio channel resources increasingly scarce. Therefore, the terminal device inevitably has adjacent channel interference during downlink reception, which results in low reception sensitivity and high reception error rate of the terminal device.

In general, a mixer is provided in a receiver of a terminal device, and a local oscillator and an intermediate frequency filter are provided in the mixer. The local oscillator is used for generating local oscillation signals, the frequency mixer carries out frequency mixing processing on the high-frequency radio-frequency signals received from the antenna and the local oscillation signals to convert the high-frequency radio-frequency signals and the local oscillation signals into intermediate-frequency signals, and the intermediate-frequency signals are filtered by the intermediate-frequency filter. In the prior art, the mixer may be configured with an intermediate frequency location, which is a frequency location where the center frequency of the radio frequency signal is converted into the intermediate frequency signal. Therefore, the intermediate frequency filter can carry out filtering according to the intermediate frequency position, so that the weakening edge of the intermediate frequency filter weakens signals beyond the central frequency, and the aim of inhibiting adjacent frequency interference is fulfilled.

In the related art, the position of the intermediate frequency configured for the mixer is usually fixed, so that the effect of suppressing the adjacent channel interference is not good.

In order to solve the above technical problem, in this embodiment of the present application, a terminal device determines, according to a radio frequency signal received at a current subframe, a distribution condition of adjacent channel interference corresponding to the current subframe and/or an error rate of the current subframe, and further determines, according to an adjacent channel interference distribution request and/or the error rate, a preferred intermediate frequency position, where the intermediate frequency position can be used in an intermediate frequency filtering process of a next subframe. By dynamically adjusting the intermediate frequency position of the next subframe according to the actual receiving condition of the current subframe, the effect of inhibiting adjacent frequency interference can be improved, so that the receiving sensitivity of the terminal equipment is improved, and the receiving error rate is reduced.

The method described in the present application will be described below with reference to specific examples. It should be noted that the following embodiments may exist alone or in combination with each other, and the description of the same or similar contents is not repeated in different embodiments.

Fig. 2 is a schematic flowchart of a method for determining an intermediate frequency position according to an embodiment of the present disclosure. The method of the embodiment may be performed by a terminal device. As shown in fig. 2, the method of the present embodiment includes:

s201: and acquiring a radio frequency signal received by the current subframe, wherein the radio frequency signal has a central frequency.

The terminal device in this embodiment may be a terminal device in a GSM network. In a GSM network, one frame includes 8 slots. The GSM radio interface employs Time Division Multiple Access (TDMA) technology. One frame may also be referred to as a TDMA frame. Each time slot may also be referred to as a TDMA subframe. In the following embodiments, unless otherwise specified, the subframe refers to a TDMA subframe. The current subframe may also be referred to as a current reception time of the terminal device, and the next subframe may also be referred to as a next reception time of the terminal device.

In an application scenario of this embodiment, the terminal device receives the radio frequency signal from the base station according to the center frequency. The center frequency may be issued by the base station to the terminal device. In practical application, adjacent channel interference inevitably exists in a radio frequency signal received by a terminal device.

S202: and acquiring first adjacent channel interference energy and second adjacent channel interference energy corresponding to the current subframe according to the radio frequency signal, wherein the first adjacent channel interference energy represents the energy of the interference signal with the frequency smaller than the central frequency in the radio frequency signal, and the second adjacent channel interference energy represents the energy of the interference signal with the frequency larger than the central frequency in the radio frequency signal.

In other words, according to the radio frequency signal, the adjacent channel interference distribution condition corresponding to the current subframe is obtained. The distribution of adjacent channel interference may indicate whether the energy of the interference signal to the left of the center frequency (i.e., the interference signal with the frequency less than the center frequency) is larger or the energy of the interference signal to the right of the center frequency (i.e., the interference signal with the frequency greater than the center frequency) is larger.

In one possible implementation manner, the distribution of the adjacent channel interference energy may be obtained in the following possible manner (see step 1 to step 4 below).

(1) And carrying out Fourier transform processing on the radio frequency signal to obtain frequency domain data corresponding to the radio frequency signal.

Illustratively, at a predetermined sampling frequency f _s And sampling the received radio frequency signal to obtain a plurality of sampling points. Assuming that the number of the sampling points is m, Fast Fourier Transform (FFT) processing is performed on the m sampling points to obtain frequency domain data corresponding to the radio frequency signal. Each group of the frequency domain data comprises j data, and each group of the frequency domain data corresponds to a frequency spectrum range such as f _d As shown.

(2) And acquiring energy of each first frequency and energy of each second frequency according to the frequency domain data, wherein the first frequency is smaller than the central frequency, and the second frequency is larger than the central frequency.

Assuming that the frequency domain data is denoted as ACS _ data, the energy of each frequency can be calculated according to the frequency spectrum of each frequency in the frequency domain data. Exemplarily, frequency f ₁ Can be expressed as power (ACS _ data) _f1 ). Where power denotes the square calculation, ACS _ data _f1 Representing the frequency f ₁ Of the spectrum of (c).

(3) And carrying out weighted summation on the energy of each first frequency to obtain the first adjacent channel interference energy.

Optionally, attenuation coefficients corresponding to each frequency may be determined according to sideband attenuation characteristics of the radio frequency filter, and are denoted as k _{0，1，2，...，j-1，j} 。

Further, the attenuation system corresponding to each first frequency can be setAnd taking the number as a weight, and carrying out weighted summation on the energy of each first frequency to obtain first adjacent channel interference energy. Since the first frequency is smaller than the center frequency, the first adjacent channel interference energy may also be referred to as interference signal energy to the left of the center frequency. Suppose the first adjacent channel interference energy is denoted as P _L And then:

P _L ＝∑ _l∈left k _l ×power(ACS_data _l ) Equation 1

Where l denotes the respective frequencies to the left of the center frequency, i.e., the first frequency.

(4) And carrying out weighted summation on the energy of each second frequency to obtain second adjacent channel interference energy.

Similarly, the attenuation coefficient corresponding to each second frequency may be used as a weight, and the energy of each second frequency is weighted and summed to obtain the second adjacent channel interference energy. Since the second frequency is greater than the center frequency, the second adjacent channel interference energy may also be referred to as interference signal energy to the right of the center frequency. Suppose the second adjacent channel interference energy is denoted as P _R And then:

P _R ＝∑ _r∈right k _r ×power(ACS_data _r ) Equation 2

Where r represents the respective frequencies to the right of the center frequency, i.e. the second frequency.

S203: determining the intermediate frequency position corresponding to the next subframe according to the first adjacent frequency interference energy and the second adjacent frequency interference energy corresponding to the current subframe; the intermediate frequency position corresponding to one subframe indicates the frequency position of the center frequency in the intermediate frequency signal corresponding to the radio frequency signal received by the subframe.

The intermediate frequency position in the embodiment of the present application includes two cases: one is to the left of the zero frequency position in the intermediate frequency signal, i.e. the intermediate frequency position corresponds to a frequency less than zero, e.g. -400 kHz. The other is located to the right of the zero frequency position of the intermediate frequency signal, i.e. the frequency corresponding to the intermediate frequency position is greater than zero, e.g. the frequency corresponding to the intermediate frequency position is +400 kHz.

Optionally, if the first adjacent channel interference energy corresponding to the current subframe is less than the second adjacent channel interference energy corresponding to the current subframe, it is determined that the intermediate frequency position corresponding to the next subframe is on the left side of the zero frequency position. It should be understood that when the first adjacent channel interference energy is smaller than the second adjacent channel interference energy, indicating that the interference on the right side of the center frequency is larger, the adjacent channel interference on the right side can be avoided by selecting the intermediate frequency position corresponding to the next subframe to the left side of the zero frequency position.

Optionally, if the first adjacent channel interference energy corresponding to the current subframe is greater than the second adjacent channel interference energy corresponding to the current subframe, it is determined that the intermediate frequency position corresponding to the next subframe is on the left side of the zero frequency position. It should be understood that when the first adjacent channel interference energy is greater than the second adjacent channel interference energy, it indicates that the interference on the left side of the center frequency is greater, and by selecting the intermediate frequency position corresponding to the next subframe to the right of the zero frequency position, the adjacent channel interference on the left side can be avoided.

Optionally, if the first adjacent channel interference energy corresponding to the current subframe is equal to the second adjacent channel interference energy corresponding to the current subframe, it is determined that the intermediate frequency position corresponding to the next subframe is the same as the intermediate frequency position corresponding to the current subframe. It should be understood that when the first adjacent channel interference energy is equal to the second adjacent channel interference energy, it indicates that the interference on the left side and the right side of the center frequency is the same, in this case, the intermediate frequency position corresponding to the next subframe may be selected to be on the left side or the right side of the zero frequency position. In order to avoid frequent replacement of the intermediate frequency position, the intermediate frequency position corresponding to the current subframe may be determined as the intermediate frequency position corresponding to the next subframe.

In some scenarios, the distribution of the adjacent channel interference may have a hopping condition, that is, most of the time points, the left adjacent channel interference energy is greater than the right adjacent channel interference energy, but some intermediate time point may briefly hop to the state that the right adjacent channel interference energy is greater than the left adjacent channel interference energy. If the intermediate frequency position of the next subframe is determined only according to the adjacent frequency interference distribution condition of the current subframe, the determined intermediate frequency position may be inaccurate. Therefore, in some possible implementation manners, the intermediate frequency position of the next subframe may be determined according to the adjacent channel interference distribution conditions of the current subframe and the first preset number of historical subframes before the current subframe, so that the accuracy of the intermediate frequency position may be improved.

For example, if the first adjacent channel interference energy corresponding to the current subframe is less than the second adjacent channel interference energy corresponding to the current subframe, and the first adjacent channel interference energy corresponding to each subframe in the first subframe set is less than the second adjacent channel interference energy corresponding to the subframe, it is determined that the intermediate frequency position of the next subframe is on the left side of the zero frequency position of the intermediate frequency signal. The first subframe set comprises a first preset number of subframes before the current subframe. In other words, if the current subframe and the first predetermined number of consecutive subframes before the current subframe satisfy: and if the first adjacent channel interference energy is less than the second adjacent channel interference energy (namely, the left adjacent channel interference energy is less than the right adjacent channel interference energy), determining that the intermediate frequency position of the next subframe is on the left side of the zero frequency position.

For example, if the first adjacent channel interference energy corresponding to the current subframe is greater than the second adjacent channel interference energy corresponding to the current subframe, and the first adjacent channel interference energy corresponding to each subframe in the first subframe set is greater than the second adjacent channel interference energy corresponding to the subframe, it is determined that the intermediate frequency position of the next subframe is on the right side of the zero frequency position of the intermediate frequency signal. The first subframe set comprises a first preset number of subframes before the current subframe. In other words, if the first predetermined number of consecutive subframes all satisfy: and if the first adjacent channel interference energy is greater than the second adjacent channel interference energy (namely, the left adjacent channel interference energy is greater than the right adjacent channel interference energy), determining that the intermediate frequency position of the next subframe is on the right side of the zero frequency position.

In this embodiment, after the intermediate frequency position of the next subframe is determined, the terminal device may perform intermediate frequency filtering on the radio frequency signal received by the next subframe according to the intermediate frequency position, so as to improve the effect of suppressing adjacent frequency interference and improve the receiving sensitivity of the terminal device.

The method for determining the intermediate frequency position provided by the embodiment comprises the following steps: acquiring a radio frequency signal received by a current subframe, wherein the radio frequency signal has a central frequency, and acquiring first adjacent channel interference energy and second adjacent channel interference energy corresponding to the current subframe according to the radio frequency signal, wherein the first adjacent channel interference energy represents energy of an interference signal of which the frequency is less than the central frequency in the radio frequency signal, and the second adjacent channel interference energy represents energy of an interference signal of which the frequency is greater than the central frequency in the radio frequency signal; and determining the intermediate frequency position corresponding to the next subframe according to the first adjacent frequency interference energy and the second adjacent frequency interference energy corresponding to the current subframe. In this embodiment, the intermediate frequency position of the next subframe is dynamically adjusted according to the adjacent frequency interference distribution of the current subframe, so that the effect of suppressing the adjacent frequency interference can be improved, the receiving sensitivity of the terminal device is improved, and the receiving error rate is reduced.

Fig. 3 is a schematic flowchart of another intermediate frequency position determining method according to an embodiment of the present application. The method of the present embodiment may be performed by a terminal device. As shown in fig. 3, the method of the present embodiment includes:

s301: and acquiring a radio frequency signal received by the current subframe, wherein the radio frequency signal has a central frequency.

It should be understood that the implementation of S301 is similar to S201 in fig. 2, and is not described herein.

S302: and acquiring the error rate of the current subframe according to the radio frequency signal.

In one possible implementation, the error rate of the current subframe may be determined in the following feasible manner (see step 1 to step 3 described below).

(1) And demodulating the radio frequency signal to obtain a demodulated signal.

And demodulating the radio-frequency signal received by the current subframe to obtain a demodulated signal. The demodulated signal may also be referred to as in-phase quadrature (IQ) data.

(2) And carrying out equalization processing on the demodulated signal to obtain soft bits of the error code.

(3) And obtaining the error rate of the current subframe according to the soft bit of the error code.

In a possible implementation manner, after the error rate of the current subframe is obtained, the error rate of the current subframe can be smoothed according to the error rates of a plurality of historical subframes, so that the smoothness of the error rate is ensured, and the jump phenomenon is avoided.

For example, the following equations 3 and 4 may be used to smooth the error rate of the current subframe:

R _(n) ＝(1-e)*R _(n-1) +e*x _(n) ，R _(-1) 0 formula 3

Wherein n is a recursion subscript, which represents a current subframe, and each GSM TDMA subframe is updated once; r _(n) Is a reliability parameter; e is a forgetting factor; mBEP _(n) The error rate is calculated according to the current subframe; BEP _(n) The error rate after smoothing; x is the number of _(n) 1 or 0, denotes the mBEP under the current recursion index n _(n) Presence or absence. Under the recursive index n, mBEP when the radio frequency signal fails to decode _(n) Is absent, i.e. x _(n) 0; when the radio frequency signal is decoded successfully, mBEP _(n) Exist, i.e. x _(n) ＝1。

S303: determining an intermediate frequency position corresponding to a next subframe according to the error rate of the current subframe and the intermediate frequency position of the current subframe; the intermediate frequency position corresponding to one subframe indicates the frequency position of the center frequency in the intermediate frequency signal corresponding to the radio frequency signal received by the subframe.

In a possible implementation manner, the error rate of a first historical subframe may be obtained according to an intermediate frequency position of a current subframe, where the first historical subframe is a historical subframe closest to the current subframe among a plurality of historical subframes, and the intermediate frequency positions of the plurality of historical subframes are different from the intermediate frequency position of the current subframe. And if the error rate of the current subframe is greater than the error rate of the first historical subframe, determining the intermediate frequency position of the first historical subframe as the intermediate frequency position of the next subframe. And if the error rate of the current subframe is less than the error rate of the first historical subframe, determining the intermediate frequency position of the current subframe as the intermediate frequency position of the next subframe.

In one example, if the middle frequency position of the current subframe is on the left side of the zero frequency position, the first historical subframe which has selected the middle frequency position to the right side of the zero frequency position for the last time is obtained from the historical subframes. In one implementation, if the error rate of the current subframe is greater than the error rate of the first historical subframe, the intermediate frequency position of the first historical subframe is determined as the intermediate frequency position of the next subframe, that is, the intermediate frequency position of the next subframe is located on the right side of the zero frequency position. And if the error rate of the current subframe is less than the error rate of the first historical subframe, determining the intermediate frequency position of the current subframe as the intermediate frequency position of the next subframe, namely the intermediate frequency position of the next subframe is on the left side of the zero frequency position.

In another implementation manner, if the error rate of the current subframe is greater than the error rate of the first historical subframe, and the absolute value of the difference between the error rate of the current subframe and the error rate of the first historical subframe is greater than a first threshold, the intermediate frequency position of the first historical subframe is determined as the intermediate frequency position of the next subframe, that is, the intermediate frequency position of the next subframe is on the right side of the zero frequency position. Otherwise, the intermediate frequency position of the current subframe is determined as the intermediate frequency position of the next subframe, that is, the intermediate frequency position of the next subframe is on the left side of the zero frequency position. The implementation mode can avoid frequent change of the intermediate frequency position.

In another example, if the middle frequency position of the current subframe is right of the zero frequency position, a first historical subframe which has selected the middle frequency position to the left of the zero frequency position for the last time is obtained from the historical subframes. In one implementation, if the error rate of the current subframe is greater than the error rate of the first historical subframe, the intermediate frequency position of the first historical subframe is determined as the intermediate frequency position of the next subframe, that is, the intermediate frequency position of the next subframe is on the left side of the zero frequency position. And if the error rate of the current subframe is less than that of the first historical subframe, determining the intermediate frequency position of the current subframe as the intermediate frequency position of the next subframe, namely the intermediate frequency position of the next subframe is on the right side of the zero frequency position.

In another implementation manner, if the error rate of the current subframe is greater than the error rate of the first historical subframe, and the absolute value of the difference between the error rate of the current subframe and the error rate of the first historical subframe is greater than a first threshold, the intermediate frequency position of the first historical subframe is determined as the intermediate frequency position of the next subframe, that is, the intermediate frequency position of the next subframe is on the left side of the zero frequency position. Otherwise, the intermediate frequency position of the current subframe is determined as the intermediate frequency position of the next subframe, namely the intermediate frequency position of the next subframe is on the right side of the zero frequency position. This implementation may avoid frequent changes in the intermediate frequency position.

The determining method of the intermediate frequency position provided by this embodiment includes: the method comprises the steps of obtaining a radio frequency signal received by a current subframe, obtaining an error rate of the current subframe according to the radio frequency signal, and determining an intermediate frequency position corresponding to a next subframe according to the error rate of the current subframe and the intermediate frequency position of the current subframe. In the embodiment, the effect of suppressing adjacent channel interference can be improved by dynamically adjusting the intermediate frequency position of the next subframe according to the error rate of the current subframe, so that the receiving sensitivity of the terminal equipment is improved, and the receiving error rate is reduced.

In the embodiment shown in fig. 2, the intermediate frequency position of the next subframe may be dynamically adjusted according to the adjacent channel interference distribution of the current subframe, and in the embodiment shown in fig. 3, the intermediate frequency position of the next subframe may be dynamically adjusted according to the error rate of the current subframe, on the basis of the embodiments shown in fig. 2 and fig. 3, the present application may further combine the embodiments shown in fig. 2 and fig. 3, that is, the intermediate frequency position of the next subframe is dynamically adjusted according to the adjacent channel interference distribution of the current subframe and the error rate, which is described below with reference to fig. 4.

Fig. 4 is a schematic flowchart of another method for determining an intermediate frequency position according to an embodiment of the present disclosure. The method of the present embodiment may be performed by a terminal device. As shown in fig. 4, the method of the present embodiment includes:

s401: and acquiring a radio frequency signal received by the current subframe, wherein the radio frequency signal has a central frequency.

S402: and acquiring first adjacent channel interference energy and second adjacent channel interference energy corresponding to the current subframe according to the radio frequency signal, wherein the first adjacent channel interference energy represents the energy of the interference signal with the frequency smaller than the central frequency in the radio frequency signal, and the second adjacent channel interference energy represents the energy of the interference signal with the frequency larger than the central frequency in the radio frequency signal.

It should be understood that the specific implementation manners of S401 and S402 are similar to those of S201 and S202 in fig. 2, and are not described herein again.

S403: and acquiring the error rate of the current subframe according to the radio frequency signal.

It should be understood that the specific implementation manner of S403 is similar to S302 in fig. 3, and is not described herein again.

S404: and determining a first intermediate frequency position according to the first adjacent frequency interference energy and the second adjacent frequency interference energy corresponding to the current subframe.

It should be understood that the determination manner of the first intermediate frequency position is similar to S203 in fig. 2, and is not described herein.

S405: and determining a second intermediate frequency position according to the error rate of the current subframe and the intermediate frequency position of the current subframe.

It should be understood that the determination manner of the second intermediate frequency position is similar to S303 in fig. 3, and is not described herein.

S406: and determining the intermediate frequency position corresponding to the next subframe according to the first intermediate frequency position and the second intermediate frequency position.

In this embodiment, after a first intermediate frequency position (similar to the embodiment shown in fig. 2) is determined according to the first adjacent channel interference energy and the second adjacent channel interference energy corresponding to the current subframe, and a second intermediate frequency position (similar to the embodiment shown in fig. 3) is determined according to the error rate of the current subframe, an intermediate frequency position corresponding to a next subframe may be determined according to the first intermediate frequency position and the second intermediate frequency position.

Optionally, if the first intermediate frequency position is the same as the second intermediate frequency position, the first intermediate frequency position is determined as the intermediate frequency position corresponding to the next subframe. For example, if the determined first if position is to the left of the zero frequency position and the second if position is also to the left of the zero frequency position, then the if position of the next subframe is to the left of the zero frequency position. If the determined first intermediate frequency position is on the right side of the zero frequency position and the second intermediate frequency position is also on the right side of the zero frequency position, the intermediate frequency position of the next subframe is on the right side of the zero frequency position.

Optionally, if the first intermediate frequency position is different from the second intermediate frequency position, the reliability of the first intermediate frequency position and the reliability of the second intermediate frequency position may be obtained, and one of the first intermediate frequency position and the second intermediate frequency position with high reliability is determined as the intermediate frequency position corresponding to the next subframe. It should be understood that the manner of determining the confidence level may be various, and the present embodiment is not particularly limited. The following description is made in connection with two examples.

In an example, if the error rate of the current subframe is greater than the error rate of the first historical subframe, and the absolute value of the difference between the error rate of the current subframe and the error rate of the first historical subframe is greater than a second threshold, which is greater than the first threshold, the intermediate frequency position determined by using the embodiment shown in fig. 3 is used, that is, the second intermediate frequency position is determined as the intermediate frequency position corresponding to the next subframe.

In another example, if the current subframe and a second preset number of consecutive subframes before the current subframe both satisfy: if the first adjacent channel interference energy is less than the second adjacent channel interference energy (i.e. the left adjacent channel interference energy is less than the right adjacent channel interference energy), and the second predetermined number is greater than the first predetermined number, the intermediate frequency position determined by the embodiment shown in fig. 2 is adopted, i.e. the first intermediate frequency position is determined as the intermediate frequency position corresponding to the next subframe.

In another example, if the current subframe and a second preset number of consecutive subframes before the current subframe satisfy: if the first adjacent channel interference energy is greater than the second adjacent channel interference energy (i.e., the left adjacent channel interference energy is greater than the right adjacent channel interference energy), and the second predetermined number is greater than the first predetermined number, the intermediate frequency position determined by the embodiment shown in fig. 2 is adopted, i.e., the first intermediate frequency position is determined as the intermediate frequency position corresponding to the next subframe.

In the embodiment, the first intermediate frequency position is determined according to the adjacent channel interference distribution request of the current subframe, the second intermediate frequency position is determined according to the error rate of the current subframe, the first intermediate frequency position and the second intermediate frequency position are judged in a combined manner, the intermediate frequency position corresponding to the next subframe is determined, the accuracy of the determined intermediate frequency position is improved, the effect of inhibiting adjacent channel interference is further improved, the receiving sensitivity of terminal equipment is improved, and the receiving error rate is reduced.

On the basis of the above embodiments, the following describes the present application with reference to a specific example.

Fig. 5 is a schematic diagram of a process for determining an intermediate frequency position according to an embodiment of the present disclosure. In this embodiment, taking a terminal device in a GSM network as an example, a frequency band of the GSM network may be 850mHz, 900mHz, 1800mHz, or 1900 mHz. Assuming that the receiving bandwidth of the terminal equipment is 650kHz, the intermediate frequency adjusting range of the terminal equipment is 400kHz, namely the intermediate frequency position of the terminal equipment can be +400kHz or-400 kHz.

In this embodiment, two different manners are respectively adopted to determine the intermediate frequency position for the radio frequency signal received by the current subframe, and then the intermediate frequency positions determined by the two manners are comprehensively considered to obtain the intermediate frequency position of the next subframe. One way is to determine the intermediate frequency position according to the adjacent channel interference distribution (corresponding to the way 1 in fig. 5), and the other way is to determine the intermediate frequency position according to the error rate (corresponding to the way 2 in fig. 5). This is described below in conjunction with fig. 5.

As shown in fig. 5, in the method 1, a radio frequency signal received by a current subframe is sampled, and a sampling rate is assumed to be 2Mhz, so that 64 sampling points are obtained. And performing FFT (fast Fourier transform) on the 64 sampling points to obtain a frequency spectrum within the range of +/-1000 kHz. Each set of 5 data in the spectrum corresponds to a spectral range of approximately 200 kHz. For accurate calculation, the boundary points before and after are discarded. Assuming that the intermediate frequency position of the current subframe is +400kHz, the frequency domain data ACS _ data obtained through FFT is shown in table 1.

TABLE 1

ACS[35～39]

…

ACS[53～57]

ACS[59～63]

ACS[1～5]

…

ACS[19～23]

ACS[24～29]

-600kHz

…

Signal

200kHz

400kHz

…

1000kHz

1200kHz

Further, the first adjacent channel interference energy and the second adjacent channel interference energy can be calculated according to the attenuation characteristic of the radio frequency filtering and the frequency domain data. Let it be assumed that the RF filter is tuned to frequencies [ -600kHz-400kHz-200kHz 200kHz 400kHz 600kHz]The interference attenuation capability of the filter is [ -18 db-8 db-1db 000]Then can be based on the coefficient k _left ＝[-18-8-1]For ACS _ data _left ＝[ACS[35～39] ACS[41～45] ACS[47～51]]Weighted summation is carried out to obtain first adjacent channel interference energy P _L . And according to the coefficient k _right ＝[000]For ACS _ data _right ＝[ACS[59～63] ACS[1～5] ACS[7～11]]Carrying out weighted summation to obtain second adjacent channel interference energy P _R . The process of weighted summation can be referred to formula 1 and formula 2 in the above embodiments.

If the first adjacent channel interference energy is greater than the second adjacent channel interference energy, i.e. P _L ＞P _R For Count _ ACI _L Adding 1, and adding Count _ ACI _R And (6) clearing. If the interference energy of the first adjacent frequency is less than that of the second adjacent frequencyDisturbance energy, i.e. P _L ＜P _R For Count _ ACI _R Adding 1, and adding Count _ ACI _L And (6) clearing. Wherein, Count _ ACI _L Indicating the number of consecutive subframes, including the current subframe, that satisfy the first energy of adjacent channel interference being greater than the second energy of adjacent channel interference. Count _ ACI _R Indicating the number of consecutive subframes, including the current subframe, that satisfy the first adjacent channel interference energy being less than the second adjacent channel interference energy.

Further, according to the accumulated Count _ ACI _L And Count _ ACI _R The first intermediate frequency position can be determined. Specifically, if Count _ ACI _R ＞Count _G1 Determining the first intermediate frequency position IF _AC On the left side of the zero-frequency position, i.e. IF _ACS L. If Count _ ACI _L ＞Count _G1 Determining the first intermediate frequency position IF _ACS To the right of the zero-frequency position, i.e. IF _ACS ＝R。

Wherein, Count _G1 Corresponding to the first predetermined number in the above embodiment. Optionally, Count _G1 May be set to a value of 6.

With continued reference to fig. 5, in mode 2, the radio frequency signal received by the current subframe is demodulated to obtain demodulated data (i.e., IQ data). And then, carrying out equalization processing on the demodulated data to obtain soft bits of the error codes. Alternatively, the demodulated data may be equalized using a viterbi (viterbi) equalization algorithm or a Single Antenna Interference Cancellation (SAIC) algorithm. Furthermore, the error rate mBEP of the current sub-frame can be calculated according to the soft bit of the error code _(n) 。

Further, the bit error rate mBEP of the current subframe may be obtained by using the formula 3 and the formula 4 in the above embodiments _(n) Smoothing to obtain smoothed bit error rate (BEP) _(n) . Optionally, the forgetting factor e may be configured to 1/16 when performing the smoothing process.

If the intermediate frequency position of the current sub-frame is on the left side of the zero frequency position, the BEP is determined _left Updating the bit error rate (BEP) of the current subframe _(n) . If the intermediate frequency position of the current sub-frame is at the right side of the zero frequency positionThen BEP will be _right Updating the bit error rate (BEP) of the current subframe _(n) . Wherein the BEP _left Indicating the bit error rate, BEP, corresponding to the most recent selection of the intermediate frequency position to the left of the zero frequency position _right This represents the corresponding error rate when the intermediate frequency position was last selected to the right of the zero frequency position.

Further, according to BEP _left And BEP _right The second intermediate frequency position IF can be determined _BEP . Specifically, if the BEP is located on the left side of the zero frequency position of the intermediate frequency position of the current subframe _left And BEP _right The following two conditions are satisfied:

BEP _left ＞BEP _right

abs(BEP _left -BEP _right )＞BEP _G1

determining a second intermediate frequency position IF _BEP To the right of the zero-frequency position, i.e. IF _BEP R; otherwise, the second intermediate frequency position IF is determined _BEP On the left side of the zero-frequency position, i.e. IF _BEP ＝L。

In the case where the IF position of the current subframe is to the right of the zero-frequency position, if BEP _left And BEP _right The following two conditions are satisfied:

BEP _left ＜BEP _right

abs(BEP _left -BEP _right )＞BEP _G1

determining a second intermediate frequency position IF _BEP On the left side of the zero-frequency position, i.e. IF _BEP L; otherwise, the second intermediate frequency position IF is determined _BEP To the right of the zero-frequency position, i.e. IF _BEP ＝R。

Wherein the BEP _G1 Corresponding to the first threshold in the above embodiment. Alternatively, BEP _G1 May be set to a value of 100.

With continued reference to FIG. 5, according to the first intermediate frequency position IF _ACS And a second intermediate frequency position IF _BEP And determining the intermediate frequency position IF corresponding to the next subframe. In one possible scenario, IF _ACS ＝IF _BEP Two modes of decision are explainedAs a result, all the intermediate frequency positions are left to the zero frequency position, and therefore, the intermediate frequency position IF corresponding to the next subframe is left to the zero frequency position, that is, IF is equal to L. IF IF _ACS ＝IF _BEP Since the two decision methods are consistent and both are right of the zero frequency position, IF of the intermediate frequency position corresponding to the next subframe is right of the zero frequency position, that is, IF is equal to R.

In another possible scenario, IF _ACS ≠IF _BEP Then, the judgment results of the two modes are inconsistent. The following two possible example ways can be used to determine the intermediate frequency position corresponding to the next sub-frame. In one example, if the condition abs (BEP) is satisfied _left -BEP _right )＞BEP _G2 Then the second intermediate frequency position IF _BEP As a final decision result, i.e. the intermediate frequency position IF for the next sub-frame _BEP . In another example, if the condition Count ACI is satisfied _R ＞Count _G2 Or Count _ ACI _L ＞Count _G2 Then the first intermediate frequency position IF _ACS As a final decision result, i.e. the intermediate frequency position IF for the next sub-frame _ACS 。

Wherein the BEP _G2 Corresponding to the second threshold, BEP, in the above-described embodiment _G2 ＞BEP _G1 。Count _G Corresponding to the second predetermined number, Count in the above embodiment _G2 ＞Count _G1 . Alternatively, BEP _G2 May be set to 3000, Count _G2 May be set to a value of 10.

Fig. 6 is a schematic structural diagram of an apparatus for determining an intermediate frequency position according to an embodiment of the present application. The apparatus of the present embodiment may be in the form of software and/or hardware. The device of the embodiment may be a chip, a module, a processor, or the like, and may also be a receiver, a terminal device, or the like. As shown in fig. 6, the apparatus 600 for determining an intermediate frequency position according to this embodiment includes: an acquisition module 601 and a processing module 602.

The acquiring module 601 is configured to acquire a radio frequency signal received by a current subframe, where the radio frequency signal has a center frequency;

a processing module 602, configured to obtain, according to the radio frequency signal, first adjacent channel interference energy and second adjacent channel interference energy corresponding to the current subframe, where the first adjacent channel interference energy represents energy of an interference signal of the radio frequency signal whose frequency is smaller than the center frequency, and the second adjacent channel interference energy represents energy of an interference signal of the radio frequency signal whose frequency is greater than the center frequency;

the processing module 602 is further configured to determine an intermediate frequency position corresponding to a next subframe according to a first adjacent channel interference energy and a second adjacent channel interference energy corresponding to the current subframe; the intermediate frequency position corresponding to one subframe indicates the frequency position of the center frequency in the intermediate frequency signal corresponding to the radio frequency signal received by the subframe.

In a possible implementation manner, the processing module 602 is specifically configured to:

demodulating the radio frequency signal to obtain a demodulated signal;

The apparatus for determining an intermediate frequency position provided in this embodiment may be configured to implement the technical solution in any of the above method embodiments, and the implementation principle and the technical effect are similar, which are not described herein again.

Fig. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present application. As shown in fig. 7, the terminal device 20 provided in this embodiment may include: a transceiver 21, a memory 32, a processor 32. The transceiver 21 may include: a transmitter and/or a receiver. The transmitter may also be referred to as a sender, a transmitter, a sending port or a sending interface, and the like, and the receiver may also be referred to as a receiver, a receiving port or a receiving interface, and the like. Illustratively, the transceiver 21, the memory 22, and the processor 23 are connected to each other by a bus 24.

Memory 22 is used to store program instructions;

the processor 23 is configured to execute the program instructions stored in the memory, so as to enable the terminal device 20 to perform any one of the above-described methods for determining the intermediate frequency position.

Wherein the receiver in the transceiver 21 is operable to perform the receiving function of the terminal device in the above-mentioned communication method.

The embodiment of the application provides a computer-readable storage medium, in which computer-executable instructions are stored, and when the computer-executable instructions are executed by a processor, the computer-readable storage medium is used for implementing the method for determining the intermediate frequency position.

Embodiments of the present application may also provide a computer program product, which can be executed by a processor, and when the computer program product is executed, the method for determining the intermediate frequency position performed by any of the terminal devices shown above can be implemented.

The terminal device, the computer-readable storage medium, and the computer program product according to the embodiments of the present application may execute the method for determining the intermediate frequency position executed by the terminal device, and specific implementation processes and beneficial effects thereof are described above and will not be described herein again.

All or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The aforementioned program may be stored in a readable memory. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned memory (storage medium) includes: read-only memory (ROM), RAM, flash memory, hard disk, solid state disk, magnetic tape (magnetic tape), floppy disk (floppy disk), optical disk (optical disk), and any combination thereof.

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processing unit of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processing unit of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.

In the present application, the terms "include" and variations thereof may refer to non-limiting inclusions; the term "or" and variations thereof may mean "and/or". The terms "first," "second," and the like in this application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. In the present application, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for determining an intermediate frequency position, comprising:

2. The method of claim 1, wherein determining the if location corresponding to the next subframe according to the first adjacent channel interference energy and the second adjacent channel interference energy corresponding to the current subframe comprises:

3. The method of claim 2, wherein determining the intermediate frequency position corresponding to the next subframe according to the error rate of the current subframe, the intermediate frequency position of the current subframe, and the first adjacent channel interference energy and the second adjacent channel interference energy corresponding to the current subframe comprises:

4. The method of claim 3, wherein determining the first intermediate frequency position according to the first adjacent channel interference energy and the second adjacent channel interference energy corresponding to the current subframe comprises:

5. The method of claim 4, wherein determining that the frequency corresponding to the first intermediate frequency position is less than zero if the first adjacent channel interference energy corresponding to the current subframe is less than the second adjacent channel interference energy corresponding to the current subframe comprises:

6. The method of claim 3, wherein determining a second IF position based on the error rate of the current subframe and the IF position of the current subframe comprises:

acquiring the error rate of a first historical subframe according to the intermediate frequency position of the current subframe, wherein the first historical subframe is the most recent historical subframe from a plurality of historical subframes to the current subframe, and the intermediate frequency positions of the plurality of historical subframes are different from the intermediate frequency position of the current subframe;

if the error rate of the current subframe is greater than that of the first historical subframe, determining the intermediate frequency position of the first historical subframe as the second intermediate frequency position;

7. The method of claim 6, wherein determining the IF position of the first historical subframe as the second IF position if the error rate of the current subframe is greater than the error rate of the first historical subframe comprises:

8. The method according to any one of claims 3 to 7, wherein determining the intermediate frequency position corresponding to the next subframe according to the first intermediate frequency position and the second intermediate frequency position comprises:

9. The method according to any one of claims 1 to 7, wherein obtaining a first adjacent channel interference energy and a second adjacent channel interference energy corresponding to the current subframe according to the radio frequency signal comprises:

and carrying out weighted summation on the energy of each second frequency to obtain second adjacent channel interference energy.

10. The method according to any one of claims 2 to 7, wherein obtaining the error rate of the current subframe according to the radio frequency signal comprises:

demodulating the radio frequency signal to obtain a demodulated signal;

11. An apparatus for determining a position of an intermediate frequency, comprising:

12. The apparatus of claim 11, wherein the processing module is specifically configured to:

13. The apparatus of claim 12, wherein the processing module is specifically configured to:

14. The apparatus of claim 13, wherein the processing module is specifically configured to:

15. The apparatus of claim 14, wherein the processing module is specifically configured to:

wherein the first set of subframes comprises: a first preset number of subframes before the current subframe.

16. The apparatus according to claim 13, wherein the processing module is specifically configured to:

17. The apparatus of claim 16, wherein the processing module is specifically configured to:

18. The apparatus according to any one of claims 13 to 17, wherein the processing module is specifically configured to:

19. The apparatus according to any one of claims 11 to 17, wherein the processing module is specifically configured to:

20. The apparatus according to any one of claims 12 to 17, wherein the processing module is specifically configured to:

demodulating the radio frequency signal to obtain a demodulated signal;

21. A terminal device, comprising: a transceiver, a processor, and a memory;

the memory stores computer-executable instructions;

the processor executes computer-executable instructions stored by the memory, causing the processor to perform the method of any of claims 1 to 10.

22. A computer-readable storage medium having computer-executable instructions stored thereon, which when executed by a processor, perform the method of any one of claims 1 to 10.