CN115942367A - Channel quality evaluation method of narrow-band system and narrow-band receiver - Google Patents
Channel quality evaluation method of narrow-band system and narrow-band receiver Download PDFInfo
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Abstract
The application discloses a channel quality evaluation method of a narrow-band system and a narrow-band receiver, which are used for selecting a frequency point with better channel quality. The working frequency band of the narrow band system is divided into n frequency points, which are respectively called as the 1 st frequency point, the 2 nd frequency point, the 8230frequency point and the n frequency points of the wide band frequency band, and the method comprises the following steps: in the process of frequency hopping among n frequency points of the narrow-band receiver, after the frequency hopping of the narrow-band receiver to the ith frequency point, calculating the power of a useful signal of the ith frequency point received by the narrow-band receiver and the power of interference signals of the 1 st, 2 nd, 8230, n frequency points, i =1, 2 nd, 8230, n; after the calculation to be executed after the narrowband receiver hops to the 1 st, 2 nd, 8230n frequency points is all executed, the smooth operation is carried out on the total power of the interference signal of the ith frequency point; and calculating the ratio of the power of the useful signal of the ith frequency point to the smooth power of the interference signal of the ith frequency point to obtain the signal-to-interference-and-noise ratio of the ith frequency point, and accordingly evaluating the channel quality of the ith frequency point.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a channel quality estimation method for a narrowband system and a narrowband receiver.
Background
The 2.4G frequency band is a global universal ISM (Industrial, scientific and medical) frequency band, and belongs to a free frequency band, and WI-FI (Wireless-Fidelity), microwave oven, bluetooth, etc. all work in the 2.4G frequency band, resulting in very crowded 2.4G frequency band. When a narrowband system and a broadband system (the narrowband system is, for example, bluetooth, and the broadband system is, for example, WI-fi. Narrowband is referred to as broadband, starting from the world telecommunication date of 2010, that is, from 5/17/2010, less than 4M is generally referred to as narrowband, and only 4M or more can be referred to as broadband) coexist, part of frequency points in the 2.4G frequency band are occupied by the broadband system, so that communication of the narrowband system on the frequency points always fails, and therefore, in order to ensure the communication quality of the narrowband system, the narrowband system needs to avoid the frequency points occupied by the broadband system and select the frequency points with better channel quality. And to select a frequency point with better channel quality, accurate channel quality evaluation is required.
Disclosure of Invention
In view of this, the present invention provides a channel quality estimation method for a narrowband system and a narrowband receiver, so as to select a frequency point with better channel quality.
A method for evaluating channel quality of narrow band system includes dividing working frequency band of narrow band system into n frequency points called 1 st, 2 nd, 8230of wide band frequency band, n frequency points, n being greater than or equal to 2, said method includes:
in the process of frequency hopping among the n frequency points of the narrow-band receiver, after the frequency hopping of the narrow-band receiver to the ith frequency point, calculating the power of a useful signal of the ith frequency point received by the narrow-band receiver and the power of interference signals of the 1 st, 2 nd, 8230, n frequency points, i =1, 2 nd, 8230, n;
after the narrow band receiver hops to 1 st, 2 nd, \8230, after the n frequency points, the calculation to be executed is all executed, the smoothing operation is carried out on the total power of the interference signal of the ith frequency point obtained by calculation, and the smoothing power of the interference signal of the ith frequency point is obtained;
and calculating the ratio of the power of the useful signal of the ith frequency point to the smooth power of the interference signal of the ith frequency point to obtain the signal-to-interference-and-noise ratio of the ith frequency point, and accordingly evaluating the channel quality of the ith frequency point.
Optionally, after the narrowband receiver hops to the ith frequency point, the ith frequency point is a working frequency point, and the rest n-1 frequency points are adjacent channel frequency points; correspondingly, after the narrowband receiver hops to the ith frequency point, calculating the power of the useful signal of the ith frequency point and the power of the interference signal of the 1 st, 2 nd, \8230ofthe n frequency points received by the narrowband receiver, including:
after the narrow-band receiver hops to the ith frequency point, sampling a signal transmitted into the narrow-band receiver by using a first analog-to-digital converter, and performing time/frequency domain conversion on the sampled signal to obtain a plurality of frequency point received signals including the n frequency points; calculating the power of the received signals of the multiple frequency points;
calculating the background noise of the narrow-band receiver according to the power of the received signals of the multiple frequency points;
sampling useful signals of the working frequency points by using a second analog-to-digital converter, and calculating the power of the useful signals of the working frequency points according to the sampling;
calculating the power of the interference signal of the working frequency point and the power of the interference signal of each adjacent channel frequency point;
the power of the interference signal of the working frequency point is equal to the difference between the power of the received signal of the working frequency point and a preset power, and the preset power is equal to the sum of the power of the useful signal of the working frequency point and the background noise;
and the power of the interference signal of the adjacent channel frequency point is equal to the difference between the power of the received signal of the adjacent channel frequency point and the background noise.
Optionally, when the upsampling multiple k of the first analog-to-digital converter is greater than or equal to n, the sampling the signal transmitted into the narrowband receiver by using the first analog-to-digital converter, and performing time/frequency domain conversion on the sampled signal to obtain a received signal of multiple frequency points including the n frequency points, includes: sampling the signal transmitted into the narrowband receiver by using a first analog-to-digital converter, wherein the sampling times are one time, and performing time/frequency domain conversion on the sampled signal to obtain received signals of k frequency points including the n frequency points;
correspondingly, the calculating the background noise of the narrowband receiver according to the power of the received signals of the multiple frequency points includes: and averaging m numbers with the minimum value in the power of the received signals of the k frequency points, and taking the average value as the bottom noise of the narrow-band receiver, wherein the number of the narrow-band receivers is made of 0-m-k.
Optionally, the performing time/frequency domain conversion on the sampling signal includes: and performing time/frequency domain conversion on the sampling signal by adopting a Fast Fourier Transform (FFT) method.
Optionally, m = n/2.
Optionally, k is a minimum upsampling multiple in a range of n or more.
Optionally, the sampling the useful signal of the working frequency point by using the second analog-to-digital converter, and calculating the power of the useful signal of the working frequency point according to the sampling, includes:
sampling useful signals of the working frequency point by using a second analog-to-digital converter, and performing correlation operation on local synchronous reference signals and receiving signals of the working frequency point by using a synchronization module to obtain x correlation signals, wherein x is the code length of the synchronous reference signals and x is greater than 0; and when the maximum value in the power of the x relevant signals is larger than the synchronous threshold value, taking the maximum value as the power of the useful signal of the working frequency point.
Optionally, after the narrowband receiver hops to the ith frequency point, the method further includes: counting the block error rate at the ith frequency point;
the channel quality of the ith frequency point is evaluated according to the above, and is replaced by: and integrating the signal-to-interference-and-noise ratio and the block error rate of the ith frequency point to evaluate the channel quality of the ith frequency point.
A narrowband receiver comprising: a processor and a memory; the processor is configured to execute a program stored in the memory, and the program is configured to execute the method for estimating channel quality of a narrowband system as disclosed in any one of the above methods.
Optionally, the narrowband receiver is a bluetooth receiver.
According to the technical scheme, the signal-to-interference-and-noise ratios of the frequency points are calculated on the side of the narrow-band receiver, and the channel quality of the frequency points is evaluated according to the signal-to-interference-and-noise ratios, so that the frequency points with better channel quality are selected.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a channel quality evaluation method for a narrowband system according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for calculating the power of interference signals at 1 st, 2 nd, \ 8230;, n frequency points and the power of useful signals at the ith frequency point received by a narrowband receiver after the narrowband receiver hops to the ith frequency point, according to the embodiment of the present invention;
fig. 3 is a flowchart of a channel quality estimation method for a narrowband system according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a narrowband receiver disclosed in the embodiment of the present invention.
Detailed Description
For reference and clarity, the terms, abbreviations or abbreviations used hereinafter are summarized as follows:
ADC: analog digital converter;
RSSI: receivedsignalstrengthnindication, received signal strength indication;
LNA: lownoise amplifier, low noise amplifier;
TIA: trans-impedance amplifier, transimpedance amplifier;
FFT: fastfourier transform, fast fourier transform;
SINR: signaltonterference noise ratio, signal to interference plus noise ratio for short; SINR refers to the ratio of the received strength of a useful signal to the received strength of an interfering signal (noise and interference), and can be simply understood as "signal-to-noise ratio";
CRC, cyclic redundancy check, is a fast algorithm that generates a short fixed bit check code from data such as network packets or computer files; the device is mainly used for detecting or checking errors which may occur after data transmission or storage; CRC realizes the function of error detection by using the principles of division and remainder, and has the advantages of clear principle, simple realization and the like;
BLER: blockErrorRate, block error rate; BLER refers to the ratio of the number of blocks with errors to the total number of blocks received by the digital circuit, i.e., the block error rate.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
Referring to fig. 1, an embodiment of the present invention discloses a channel quality assessment method for a narrowband system, where a working frequency band of the narrowband system is divided into n frequency points, which are respectively referred to as 1 st, 2 nd, 8230of a wideband frequency band, where n is greater than or equal to 2, and the method includes the following steps S01 to S04:
step S01: in the process of frequency hopping among the n frequency points of the narrow-band receiver, after the frequency hopping of the narrow-band receiver reaches the ith frequency point, calculating the power of interference signals of the n frequency points and the power of useful signals of the ith frequency point, i =1, 2, \ 8230, n, which are received by the narrow-band receiver; thereafter, the process proceeds to step S02.
Specifically, the narrowband system uses a frequency hopping technique to implement spread spectrum communication, and the frequency hopping technique is a communication manner in which the carrier frequency of the wireless transmission signal of the equipment of the transmitting and receiving parties is discretely changed according to a predetermined algorithm or rule, so that it can be seen that the equipment of the transmitting and receiving parties synchronously hops among the n frequency points in the communication process. Take the narrowband system as bluetooth 5.0 classic bluetooth (i.e. bluetooth core specification version 5.0) as an example: the working frequency band used by the Bluetooth 5.0 classic Bluetooth for Bluetooth data transmission is 2402 MHz-2480 MHz in the 2.4G frequency band, the Bluetooth 5.0 classic Bluetooth is one frequency point in each 1MHz bandwidth, which corresponds to 79 frequency points, and in the communication process, the equipment of the two parties of Bluetooth 5.0 classic Bluetooth transceiver synchronously jumps among the 79 frequency points of 2402 MHz-2480 MHz.
When a receiving party in a narrowband system, namely a narrowband receiver, works on the ith frequency point, the narrowband receiver receives a useful signal (a narrowband signal) from the ith frequency point, and simultaneously, interference signals are generated on the 1 st, 2 nd, \8230;, n frequency points of a wideband frequency band, the power of the useful signal from the ith frequency point and the power of the interference signals from the 1 st, 2 nd, \8230, n frequency points of the wideband frequency band are related to the channel quality of the ith frequency point, so that the power of the signals needs to be accurately calculated.
Referring to fig. 2, the specific implementation process of step S01 may be further subdivided into the following steps S011 through S014:
step S011: after the frequency of the narrow-band receiver is hopped to the ith frequency point, sampling the signal injected into the narrow-band receiver by using a first ADC (analog to digital converter), and carrying out time/frequency domain conversion on the sampled signal to obtain a plurality of frequency point received signals including the n frequency points; calculating the power of the received signals of the multiple frequency points; thereafter, the process proceeds to step S012.
Specifically, step S011 is a wideband RSSI calculation process, after a full-band bandwidth signal sent to a narrowband receiver by a narrowband transmitter is processed by an LNA, a TIA, a filter circuit, and the like, the narrowband receiver samples the processed signal by using a first ADC, and then performs time domain to frequency domain conversion on the sampled signal to obtain received signals of multiple frequency points, where the multiple frequency points can fully cover the n frequency points. In the frequency domain, the power of a frequency point signal represents the strength of a frequency point signal.
The time-domain to frequency-domain conversion method is, for example, but not limited to, FFT.
The up-sampling multiple k of the first ADC (if the up-sampling multiple of the first ADC is k, the sampling rate of the first ADC is k × 1 MHz) is appropriately selected according to the number of frequency bins n of the narrowband receiver, and the up-sampling multiple k is preferably greater than or equal to the lowest sampling rate in the range of n because: when the narrow-band receiver works on the ith frequency point, the ith frequency point is a working frequency point, the rest n-1 frequency points are adjacent channel frequency points, and the received signals of the working frequency point and the received signals of the n-1 adjacent channel frequency points of the narrow-band receiver are needed to be used in the subsequent calculation; the first ADC performs sampling by taking a working frequency point of the narrowband receiver as a center, and received signals of k frequency points can be obtained after one-time sampling (namely the sampling frequency is 1 time) and time/frequency domain conversion are performed by the first ADC, when k is more than or equal to n, the k frequency points are enough to fully cover the n frequency points of the narrowband receiver at one time, that is, from the sampling frequency of the first ADC, when k is more than or equal to n, the received signals of the k frequency points obtained by the first ADC only through one-time sampling are enough to include the received signals of the n frequency points of the narrowband receiver; if the ADC with the larger upsampling multiple k is adopted, although the sampling of the received signals of n frequency points can be completed only by one-time sampling, the cost is wasted; if an ADC with the upsampling multiple k smaller than n is adopted, the received signals of the n frequency points can be completely sampled only by multiple times of frequency hopping and multiple sampling, and the efficiency is low.
Taking a narrow-band receiver as a Bluetooth 5.0 classic Bluetooth receiver as an example, the working frequency band of the narrow-band receiver is 2402 MHz-2480 MHz, one frequency point corresponds to 79 frequency points in each 1MHz bandwidth, in the ADCs with sampling rates of 64MHz, 128MHz and 256MHz respectively, the ADC with the sampling rate of 128MHz is preferably used as a first ADC, the ADC with the sampling rate of 128MHz samples by taking the working frequency point of the narrow-band receiver as a center, when the narrow-band receiver works at the 2440MHz frequency point, the received signals of the 128 frequency points obtained by ADC sampling and time/frequency domain conversion are the received signals of 2377 MHz-2504 MHz frequency points, and the received signals of the 2402 MHz-2480 MHz frequency points are extracted for subsequent calculation; when the narrow-band receiver works at a 2441MHz frequency point, receiving signals of 128 frequency points obtained by ADC sampling and time/frequency domain conversion are 2378 MHz-2505 MHz; 823060, 8230; by analogy, when the narrowband receiver works at a 2480MHz frequency point, received signals of 128 frequency points obtained through ADC sampling and time/frequency domain conversion are 2417 MHz-2544 MHz (wherein the received signals of the frequency points beyond the range of 2402 Mhz-2480 MHz do not need to be recorded).
Step S012: calculating the background noise of the narrow-band receiver according to the power of the received signals of the multiple frequency points; thereafter, the process proceeds to step S013.
Specifically, when the up-sampling multiple k of the first ADC is greater than or equal to n, the powers of the received signals of k frequency points obtained are respectively P 1 、P 2 、…、P k Then, calculating the background noise of the narrowband receiver according to the power of the received signals of the multiple frequency points, including: to P 1 、P 2 、…、P k Averaging the m numbers with the minimum mean value, and taking the average value as the bottom noise of the narrow-band receiver, 0<m<k. The embodiment of the invention recommends setting m = k/2, but is not limited.
And if the up-sampling multiple k of the first ADC is less than n, taking m numbers with the minimum value in the power of the received signals of k frequency points obtained after any one time of sampling to calculate an average value, and taking the average value as the bottom noise of the narrow-band receiver.
Step S013: sampling the useful signals of the working frequency points by using a second ADC, and calculating the power of the useful signals of the working frequency points; thereafter, the process proceeds to step S014.
Specifically, sampling useful signals of a working frequency point by using a second ADC, and performing correlation operation on a local synchronous reference signal and receiving signals of the working frequency point by using a synchronization module to obtain x correlation signals, wherein x is the code length of the synchronous reference signal, and x is greater than 0; and when the maximum value in the power of the x relevant signals is greater than the synchronization threshold value (namely, synchronization is met), taking the maximum value as the power of the useful signal of the working frequency point, so that the power of the useful signal of the working frequency point is more accurate.
Step S014: calculating the power of the interference signal of the working frequency point and the power of the interference signal of each adjacent channel frequency point, wherein the calculation formula is as follows:
the power of an interference signal of the working frequency point = the power of a received signal of the working frequency point-the power of a useful signal of the working frequency point-the background noise;
and the power of the interference signal of the adjacent channel frequency point = the power of the received signal of the local adjacent channel frequency point-the background noise.
Step S02: after the narrow-band receiver hops to 1 st, 2 nd, 8230and n frequency points, the calculation to be executed is all executed, and then the smooth operation is carried out on the total power of the interference signal of the ith frequency point obtained by calculation to obtain the smooth power of the interference signal of the ith frequency point; then, the process proceeds to step S03.
Specifically, the basic idea of the smoothing operation, i.e., the exponential smoothing operation, is as follows: the predicted value is a weighted sum of previous observations and different data is given different weight, new data is given greater weight and old data is given lesser weight. The power of the interference signal of the ith frequency point obtained through the smoothing operation is more accurate.
Step S03: calculating the ratio of the power of the useful signal of the ith frequency point to the smooth power of the interference signal of the ith frequency point to obtain the SINR of the ith frequency point; then, the process proceeds to step S04.
Step S04: and evaluating the channel quality of the ith frequency point according to the SINR of the ith frequency point.
As can be seen from the above description, in the embodiments of the present invention, the sirs of multiple frequency points are calculated on the side of the narrowband receiver, and the channel quality of the frequency points is evaluated according to the sirs, so as to select a frequency point with better channel quality.
Optionally, on the basis of any of the embodiments disclosed above, BLER may be introduced in the embodiments of the present invention, and then SINR and BLER are integrated to estimate channel quality, the corresponding channel quality estimation method of the narrowband system is shown in fig. 3, where the working frequency band of the narrowband system is divided into n frequency points, which are respectively referred to as 1 st frequency point, 2 nd frequency point, 8230n frequency points, and n frequency points, where n is greater than or equal to 2 of the wideband frequency band, and the method includes the following steps S21 to S24:
step S21: in the process of frequency hopping among the n frequency points of the narrow-band receiver, after the frequency hopping of the narrow-band receiver is carried out to the ith frequency point, calculating the power of interference signals of the n frequency points and the power of useful signals of the ith frequency point received by the narrow-band receiver, and counting the BLER of the ith frequency point, i =1, 2, \ 8230;, n; the process then proceeds to step S22.
Step S22: after the narrow-band receiver hops to 1 st, 2 nd, 8230and n frequency points, the calculation to be executed is all executed, and then the smooth operation is carried out on the total power of the interference signal of the ith frequency point obtained by calculation to obtain the smooth power of the interference signal of the ith frequency point; then, the process proceeds to step S23.
Step S23: calculating the ratio of the power of the useful signal of the ith frequency point to the smooth power of the interference signal of the ith frequency point to obtain the SINR of the ith frequency point; the process then proceeds to step S24.
Step S24: and integrating the SINR and BLER of the ith frequency point and evaluating the channel quality of the ith frequency point.
Specifically, after the narrowband receiver hops to the ith frequency point, CRC is removed from the data packet received by the narrowband receiver to obtain a CRC value, where CRC =0 is correct reception and CRC =1 is incorrect reception. Block error, i.e. when the packet CRC =1 is received in error. And (3) indirectly obtaining the interference condition of the corresponding frequency point by counting BLER, wherein the larger the BLER is, the larger the interference degree is judged to be. Estimating the channel quality by using BLER alone or SINR alone is prone to erroneous determination. Therefore, the embodiment of the invention combines the two to judge the channel quality of the working frequency point, and if the SINR of the working frequency point is greater than the first preset value and the BLER of the working frequency point is less than the second preset value, the availability of the working frequency point is judged.
In addition, an embodiment of the present invention further discloses a narrowband receiver, as shown in fig. 4, including: a processor and a memory;
wherein the processor is configured to run a program stored in the memory, the program when running executing any one of the methods for channel quality assessment of a narrowband system as disclosed above.
Optionally, the narrowband receiver is a bluetooth receiver, but is not limited to this.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the narrowband receiver disclosed by the embodiment, the description is relatively simple because the narrowband receiver corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the description of the method part.
The terms "first," "second," and the like in the description and in the claims, and in the drawings, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the use of the verb "comprise a" to define an element does not exclude the presence of another, identical element in a process, method, article, or apparatus that comprises the element.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
For the system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment. The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the embodiments. Thus, the present embodiments are not intended to be limited to the embodiments shown herein but are to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for evaluating channel quality of narrow band system includes dividing working frequency band of narrow band system into n frequency points called 1 st, 2 nd, 8230of wide band frequency band, n frequency points, n being greater than or equal to 2, characterizing in including:
in the process of frequency hopping among the n frequency points of the narrow-band receiver, after the frequency hopping of the narrow-band receiver to the ith frequency point, calculating the power of a useful signal of the ith frequency point received by the narrow-band receiver and the power of interference signals of the 1 st, 2 nd, 8230, n frequency points, i =1, 2 nd, 8230, n;
after the narrow band receiver hops to 1 st, 2 nd, \8230, after the n frequency points, the calculation to be executed is all executed, the smoothing operation is carried out on the total power of the interference signal of the ith frequency point obtained by calculation, and the smoothing power of the interference signal of the ith frequency point is obtained;
and calculating the ratio of the power of the useful signal of the ith frequency point to the smooth power of the interference signal of the ith frequency point to obtain the signal-to-interference-and-noise ratio of the ith frequency point, and accordingly evaluating the channel quality of the ith frequency point.
2. The channel quality assessment method of the narrowband system according to claim 1, wherein after the narrowband receiver hops to the ith frequency point, the ith frequency point is a working frequency point, and the remaining n-1 frequency points are all adjacent channel frequency points; correspondingly, after the narrow band receiver hops to the ith frequency point, the power of the useful signal of the ith frequency point received by the narrow band receiver and the power of the interference signal of the 1 st, 2 nd, 8230th frequency points are calculated, and the power of the interference signal of the n frequency points comprises the following steps:
after the narrow-band receiver hops to the ith frequency point, sampling a signal transmitted into the narrow-band receiver by using a first analog-to-digital converter, and performing time/frequency domain conversion on the sampled signal to obtain a plurality of frequency point received signals including the n frequency points; calculating the power of the received signals of the multiple frequency points;
calculating the background noise of the narrow-band receiver according to the power of the received signals of the multiple frequency points;
sampling useful signals of the working frequency points by using a second analog-to-digital converter, and calculating the power of the useful signals of the working frequency points according to the sampling;
calculating the power of the interference signal of the working frequency point and the power of the interference signal of each adjacent channel frequency point;
the power of the interference signal of the working frequency point is equal to the difference between the power of the received signal of the working frequency point and a preset power, and the preset power is equal to the sum of the power of the useful signal of the working frequency point and the background noise;
and the power of the interference signal of the adjacent channel frequency point is equal to the difference between the power of the received signal of the adjacent channel frequency point and the background noise.
3. The method for evaluating channel quality of a narrowband system according to claim 2, wherein when the upsampling multiple k of the first analog-to-digital converter is greater than or equal to n, the sampling the signal transmitted to the narrowband receiver by the first analog-to-digital converter, and performing time/frequency domain conversion on the sampled signal to obtain the received signal of multiple frequency points including the n frequency points, comprises: sampling the signal transmitted into the narrow-band receiver by using a first analog-to-digital converter, wherein the sampling times are once, and performing time/frequency domain conversion on the sampled signal to obtain received signals of k frequency points including the n frequency points;
correspondingly, the calculating the background noise of the narrowband receiver according to the power of the received signals of the multiple frequency points includes: and averaging m numbers with the minimum value in the power of the received signals of the k frequency points, and taking the average value as the bottom noise of the narrow-band receiver, wherein the number of the narrow-band receivers is made of 0-m-k.
4. The channel quality estimation method of the narrowband system according to claim 2 or 3, wherein the time/frequency domain converting the sampled signal comprises: and performing time/frequency domain conversion on the sampling signal by adopting a Fast Fourier Transform (FFT) method.
5. The channel quality estimation method of the narrowband system according to claim 3, wherein m = n/2.
6. The method of claim 3, wherein k is a minimum upsampling multiple in a range of n or more.
7. The method for evaluating channel quality of a narrowband system according to claim 2 or 3, wherein the sampling the useful signal at the working frequency point by the second analog-to-digital converter, and calculating the power of the useful signal at the working frequency point according to the sampling comprises:
sampling useful signals of the working frequency point by using a second analog-to-digital converter, and performing correlation operation on local synchronous reference signals and receiving signals of the working frequency point by using a synchronization module to obtain x correlation signals, wherein x is the code length of the synchronous reference signals and x is greater than 0; and when the maximum value in the power of the x relevant signals is larger than the synchronous threshold value, taking the maximum value as the power of the useful signal of the working frequency point.
8. The channel quality assessment method of the narrowband system according to claim 1, wherein after the narrowband receiver hops to the ith frequency point, the method further comprises: counting the block error rate at the ith frequency point;
the channel quality of the ith frequency point is evaluated according to the above, and is replaced by: and integrating the signal to interference and noise ratio and the block error rate of the ith frequency point to evaluate the channel quality of the ith frequency point.
9. A narrowband receiver, comprising: a processor and a memory; the processor is configured to execute a program stored in the memory, and the program is executed to execute the method for estimating channel quality of a narrowband system according to any one of claims 1 to 8.
10. The narrowband receiver of claim 9, wherein the narrowband receiver is a bluetooth receiver.
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