CN115361034A - Transceiver distance selection system based on carrier frequency communication - Google Patents

Abstract

The invention discloses a transceiver distance selection system based on carrier frequency communication, which includes a key performance index verification module, a data monitoring module, and a distance selection module, and the key performance index verification module is used for key performance data required by the transceiver The reliability of the system is verified, the data monitoring module is used to monitor system data, the distance selection module is used to select the access distance of the transceiver according to the verification result, and the key performance index verification module includes a sensitivity verification module, a noise A coefficient verification module, a linearity verification module, and a dynamic range verification module, the sensitivity verification module is used to verify the ability of the transceiver to receive weak signals, and the noise figure verification module is used to verify the irregularity of charged particles in the internal components of the transceiver The noise generated by motion is used for data verification, and the present invention has the feature of selection function.

Description

A Transceiver Distance Selection System Based on Carrier Frequency Communication

technical field

The invention relates to the technical field of wireless communication, in particular to a transceiver distance selection system based on carrier frequency communication.

Background technique

Wireless communication needs to rely on baseband signals in the process of signal transmission, and baseband signals cannot be actively transmitted in free space, and the signals need to be modulated, demodulated, amplified, and filtered by radio frequency transceivers to achieve communication between the information source and the receiver. Communication over unlimited distances. The key performance indicators of RF transceivers include sensitivity, linearity, harmonic suppression, spurious control, and transmission power. Different structures have a great impact on performance indicators, and will also have great changes in communication quality. The distance selection between the transceivers will also affect the signal quality, and most of the current transceiver equipment is fixed in position, and it is difficult to change its position in the subsequent maintenance process, which makes it difficult to adjust the distance between the transceivers. Therefore, it is necessary to design a selection function A transceiver distance selection system based on carrier frequency communication is necessary.

Contents of the invention

The purpose of the present invention is to provide a transceiver distance selection system based on carrier frequency communication, so as to solve the problems raised in the above-mentioned background technology.

In order to solve the above technical problems, the present invention provides the following technical solutions: a transceiver distance selection system based on carrier frequency communication, including a key performance indicator verification module, a data monitoring module, and a distance selection module, and the key performance indicator verification module is used for The reliability of the system is verified according to the key performance data required by the transceiver, the data monitoring module is used to monitor system data, and provides data support for the key performance indicator verification module, and the distance selection module is used to select the transceiver according to the verification result The access distance of the machine, the key performance indicator verification module includes a sensitivity verification module, a noise figure verification module, a linearity verification module, and a dynamic range verification module, and the sensitivity verification module is used to verify the ability of the transceiver to receive weak signals , the noise figure verification module is used to verify the data of the noise generated by the irregular movement of charged particles in the internal components of the transceiver, and the linearity verification module is used to verify the proportion of the internal circuit system of the transceiver in the linear working area, so The dynamic range verification module is used to calculate the span between the maximum signal and the minimum signal when the transceiver can receive signals normally.

According to the above technical solution, the data monitoring module includes a noise bandwidth equivalent module, a noise figure calculation module, a modulation characteristic function selection module, and a power recording module, and the noise bandwidth equivalent module is used to equivalently In numerical form, the noise figure calculation module is used to calculate the noise figure inside the circuit, the modulation characteristic function selection module is used to select a characteristic function according to the modulation type of the receiver, and the power recording module is used to check the circuit when it is working Record the input signal power, input noise power, output signal power, and output noise power.

According to the above technical solution, the distance selection module includes a multi-stage link gain calculation module, a cluster display module, and a receiving range selection module, and the multi-stage link gain calculation module is used for multi-stage cascaded transceiver link gain performing calculations, the cluster display module is used to display the transceiver devices within the gain range of the receiving end as a cluster, and the receiving range selection module is used to select a receiving cluster that matches the noise figure.

According to the above technical solution, the data monitoring module includes the following data:

Equivalent noise bandwidth B, receiver noise figure N _F , minimum signal-to-noise ratio SNR _min when detecting signals, modulation characteristic function K _m , input signal power S _i at the receiver end, input noise power N _i , output signal power S _o , the output noise power N _o , the noise output power N _A generated inside the circuit.

According to the above technical solution, the calculation formula of the noise figure _NF of the receiver is:

Among them, S _i is the input signal power at the receiver, N _i is the input noise power, S _o is the output signal power, N _o is the output noise power;

Among them, the relationship between the output power of the noise and the input power is as follows:

N _o =GN _i +N _A

In the formula, G is the link gain of the circuit, which is related to the complexity of the circuit, and N _A is the noise output power generated inside the circuit;

For a multi-stage cascaded circuit, the formula for the noise figure _NF of a single circuit can be extended to:

Further, the noise figure formula of a single circuit can be optimized as:

The above formula is optimized from the noise figure formula of individual circuits in multi-stage cascaded circuits.

According to the above technical solution, in the multi-stage cascaded circuit, the calculation formula of the total noise factor F in the link is:

Among them, N _Fn is the noise figure of a single circuit, n is the number of circuit stages, G ₁ , G ₂ ... are the gains of circuits at all levels, N _F1 , N _F2 ... are the noise figures of circuits at all levels.

According to the above technical solution, the working method of the distance selection module includes the following steps:

Step S1: Calculate the required gain B according to the total noise figure of the multi-stage cascaded circuit;

Step S2: Number the receivers within the same gain range and display them in clusters;

Step S3: Define the receiving range and match it with the gain range;

Step S4: Select a receiver with a larger gain for signal transmission and reception.

According to the above technical solution, in the step S1, the formula for calculating the gain B required by the multi-stage cascaded circuit is:

In the formula, k is an inverse proportional control parameter, which is related to the size of F, and when 0<F<1, k<0, ensuring that the required gain of the multi-stage cascaded circuit is always positive.

According to the above technical solution, in the step S4, the method for selecting a receiver with a larger gain is:

When the signal touches the first receiver during transmission, obtain its circuit gain, and use the bubbling method to screen subsequent receivers until all identifiable receivers within the range are selected, and the rest is the one with the largest gain receiver.

Compared with the prior art, the beneficial effects achieved by the present invention are: in the present invention, by providing a noise figure calculation module, for a communication system, in order to improve the sensitivity of the system, it mainly depends on compressing the bandwidth of the system or changing the modulation mode , and for a certain system, only the noise figure is variable, so the noise figure is calculated; by setting a multi-stage link gain calculation module, multiple noise sources are cascaded according to the noise figure value to achieve different frequency Effects that can be eliminated by noise cascading.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:

Fig. 1 is a schematic diagram of the composition of the system modules of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Fig. 1, the present invention provides a technical solution: a transceiver distance selection system based on carrier frequency communication, including a key performance index verification module, a data monitoring module, and a distance selection module, and the key performance index verification module is used to The required key performance data is used to verify the reliability of the system. The data monitoring module is used to monitor system data and provide data support for the key performance index verification module. The distance selection module is used to select the access distance of the transceiver according to the verification results. The key performance The indicator verification module includes a sensitivity verification module, a noise figure verification module, a linearity verification module, and a dynamic range verification module. The sensitivity verification module is used to verify the ability of the transceiver to receive weak signals, and the noise figure verification module is used to verify the internal components of the transceiver The noise generated by the irregular movement of medium-charged particles is used for data verification. The linearity verification module is used to verify the proportion of the internal circuit system of the transceiver in the linear working area. The dynamic range verification module is used to calculate the maximum signal when the transceiver can receive signals normally. span with minimum signal. The noise sources in the receiving circuit can be divided into internal noise and external noise. The external noise is the noise received by the antenna from the outside. This value is generally a fixed value. The internal noise is caused by the irregular movement of charged particles in the electronic devices inside the circuit. , it is difficult to measure, so the noise figure is introduced to monitor; all active circuits may have distortions such as harmonics and intermodulation, because the circuit generates additional signals when operating in the non-linear region, so the linearity is introduced to monitor Indicates the working quality of the transceiver; in the actual application environment, the signal power received by the receiver is not a fixed value, and will fluctuate greatly due to changes in the actual environment. If the input signal of the receiver is a small signal, it will be blocked. The situation of noise signal interference makes it impossible to receive effective signals. If the input signal of the receiver is too large, it will cause the signal distortion of the devices in the circuit. Therefore, the dynamic range of the receiver needs to be adjusted.

The data monitoring module includes a noise bandwidth equivalent module, a noise figure calculation module, a modulation characteristic function selection module, and a power recording module. The noise bandwidth equivalent module is used to equivalent the noise bandwidth in the receiver to a numerical form, and the noise figure calculation module To calculate the noise figure inside the circuit, the modulation characteristic function selection module is used to select the characteristic function according to the modulation type of the receiver, and the power recording module is used to record the input signal power, input noise power, output signal power and output noise power when the circuit is working Make a note. For a communication system, in order to improve the sensitivity of the system, it mainly depends on compressing the bandwidth of the system or changing the modulation method, but for a certain system, only the noise figure is variable, so the noise figure is calculated.

The distance selection module includes a multi-stage link gain calculation module, a cluster display module, and a receiving range selection module. The multi-stage link gain calculation module is used to calculate the multi-stage cascaded transceiver link gain, and the cluster display module is used to Transceiver devices within the gain range of the receiving end are displayed as a cluster, and the receiving range selection module is used to select a receiving cluster that matches the noise figure.

In the data monitoring module, the following data are included:

Equivalent noise bandwidth B, receiver noise figure N _F , minimum signal-to-noise ratio SNR _min when detecting signals, modulation characteristic function K _m , input signal power S _i at the receiver end, input noise power N _i , output signal power S _o , the output noise power N _o , the noise output power N _A generated inside the circuit.

The formula for calculating the receiver noise figure _NF is:

Among them, S _i is the input signal power at the receiver, N _i is the input noise power, S _o is the output signal power, N _o is the output noise power;

Among them, the relationship between the output power of the noise and the input power is as follows:

N _o =GN _i +N _A

In the formula, G is the link gain of the circuit, which is related to the complexity of the circuit, and N _A is the noise output power generated inside the circuit;

For a multi-stage cascaded circuit, the formula for the noise figure _NF of a single circuit can be extended to:

Further, the noise figure formula of a single circuit can be optimized as:

The above formula is optimized from the noise figure formula of individual circuits in multi-stage cascaded circuits. The noise in the receiver circuit has a great influence on the stability of the system. Among them, the noise source can be divided into internal noise and external noise. The external noise is related to the receiving antenna and can be filtered out by filtering equipment, but the source of the internal noise is each in the circuit. The irregular movement of charged particles in the device is difficult to filter out. Therefore, it is necessary to define its size by noise factor, and multiple noise sources are cascaded according to this value to achieve the effect that different frequency noise can be eliminated after cascading.

In a multi-stage cascaded circuit, the formula for calculating the total noise figure F in the link is:

Among them, N _Fn is the noise figure of a single circuit, n is the number of circuit stages, G ₁ , G ₂ ... are the gains of circuits at all levels, N _F1 , N _F2 ... are the noise figures of circuits at all levels. The front-stage circuit has a great influence on the total noise figure. Therefore, in the design of the circuit, the noise figure of the front-stage circuit should be as small as possible. The impact of the post-stage circuit on the total noise figure. At the same time, noise sources with the same coefficient can be connected in parallel in the post-stage circuit to achieve offset between noises and further increase the stability and fluency of the system.

The working method of the distance selection module consists of the following steps:

Step S1: Calculate the required gain B according to the total noise figure of the multi-stage cascaded circuit;

Step S2: Number the receivers within the same gain range and display them in clusters;

Step S3: Define the receiving range and match it with the gain range;

Step S4: Select a receiver with a larger gain for signal transmission and reception.

In step S1, the formula for calculating the gain B required by the multi-stage cascaded circuit is:

In the formula, k is an inverse proportional control parameter, which is related to the size of F, and when 0<F<1, k<0, ensuring that the required gain of the multi-stage cascaded circuit is always positive. The gain required by the multi-stage cascaded circuit is inversely proportional to the noise figure in the receiver circuit, and there is an upper limit. When the required gain of the multi-stage cascaded circuit exceeds the upper limit, the excess will cause the circuit noise to be unbalanced and the system unstable.

In step S4, the method for selecting a receiver with a larger gain is:

When the signal touches the first receiver during transmission, obtain its circuit gain, and use the bubbling method to screen subsequent receivers until all identifiable receivers within the range are selected, and the rest is the one with the largest gain receiver. The advantage of using the bubbling method for comparison is that it can not only screen out the receiver with the largest gain, but also sort the numbered receivers according to the gain, and reduce the system operation in the subsequent signal identification process of the receiver. The efficiency is higher, and at the same time, receivers whose performance does not meet the application can be screened out, reducing extra energy consumption and facilitating maintenance.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device.

Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. A transceiver distance selection system based on carrier frequency communication comprises a key performance index verification module, a data monitoring module and a distance selection module, and is characterized in that: the system comprises a key performance index verification module, a data monitoring module, a noise coefficient verification module, a linearity verification module and a dynamic range verification module, wherein the key performance index verification module is used for verifying the reliability of the system according to key performance data required by a transceiver, the data monitoring module is used for monitoring the system data and providing data support for the key performance index verification module, the distance selection module is used for selecting the access distance of the transceiver according to a verification result, the key performance index verification module comprises a sensitivity verification module, a noise coefficient verification module, a linearity verification module and a dynamic range verification module, the sensitivity verification module is used for verifying the capability of the transceiver for receiving weak signals, the noise coefficient verification module is used for performing data verification on noise generated by irregular movement of charged particles in an internal device of the transceiver, the linearity verification module is used for verifying the proportion of an internal circuit system of the transceiver in a linear working area, and the dynamic range verification module is used for calculating the span of a maximum signal and a minimum signal when the transceiver can normally receive signals.

2. A transceiver distance selection system based on carrier frequency communication according to claim 1, characterized in that: the data monitoring module comprises a noise bandwidth equivalent module, a noise coefficient calculation module, a modulation characteristic function selection module and a power recording module, wherein the noise bandwidth equivalent module is used for enabling the noise bandwidth in the receiver to be equivalent to a numerical value form, the noise coefficient calculation module is used for calculating the noise coefficient in the circuit, the modulation characteristic function selection module is used for selecting a characteristic function according to the modulation type of the receiver, and the power recording module is used for recording the input signal power, the input noise power, the output signal power and the output noise power when the circuit works.

3. A system according to claim 2, wherein the transceiver distance selection system is further configured to: the distance selection module comprises a multi-stage link gain calculation module, a cluster display module and a receiving range selection module, wherein the multi-stage link gain calculation module is used for calculating the multi-stage cascaded transceiver link gain, the cluster display module is used for displaying transceiver equipment in a receiving end gain interval as clusters, and the receiving range selection module is used for selecting a receiving cluster matched with the noise coefficient.

4. A transceiver distance selection system based on carrier frequency communication according to claim 3, characterized in that: the data monitoring module comprises the following data:

equivalent noise bandwidth B, receiver noise figure N _F SNR (signal to noise ratio) minimum when detecting a signal _min Modulation characteristic function K _m Input signal power S at the receiver end _i Input noise power N _i Output signal power S _o Output noise power N _o Noise output power N generated inside the circuit _A 。

5. A system as claimed in claim 4, wherein the transceiver distance selection system comprises: noise figure N of the receiver _F The calculation formula of (2) is as follows:

wherein S is _i For the input signal power at the receiver, N _i For input of noise power, S _o To output signal power, N _o To output noise power;

wherein, the relation between the output power and the input power of the noise is as follows:

N _o ＝GN _i +N _A

where G is the link gain of the circuit and is related to the complexity of the circuit, and N is _A Outputting power for noise generated inside the circuit;

noise figure N of individual circuits for a multistage cascade of circuits _F The formula of (c) can be extended to:

further, the noise figure formula of the individual circuit can be optimized as:

the above equation is optimized from the noise figure equations of the individual circuits in the multi-stage cascaded circuit.

6. A transceiver distance selection system based on carrier frequency communication according to claim 5, characterized in that: in the multistage cascade circuit, the calculation formula of the total noise coefficient F in the link is as follows:

wherein, N _Fn Is the noise figure of an individual circuit, n is the number of circuit stages, G ₁ ，G ₂ 8230denotes the gain of each stage of circuit, N _F1 ，N _F2 8230denotes the noise coefficient of each stage of circuit.

7. A system as claimed in claim 6, wherein the transceiver distance selection system comprises: the working method of the distance selection module comprises the following steps:

step S1: calculating a required gain B according to the total noise coefficient of the multistage cascade circuit;

step S2: numbering and displaying receivers in the same gain range in a cluster manner;

and step S3: defining a receiving range and matching with the gain range;

and step S4: and selecting a receiver with larger gain for signal transmission and transceiving.

8. A transceiver distance selection system based on carrier frequency communication according to claim 7, characterized in that: in step S1, a calculation formula of the gain B required by the multistage cascade circuit is:

in the formula, k is an inverse proportional control parameter, the value is related to the magnitude of F, and when 0 and less F are less than 1, k <0, it is ensured that the gain required by the multistage cascade circuit is always positive.

9. A system as claimed in claim 8, wherein the transceiver distance selection system comprises: in step S4, the method for selecting the receiver with larger gain includes:

when the signal contacts the first receiver in transmission, the circuit gain is obtained, and the subsequent receivers are screened by adopting an bubbling method until all the receivers which can be identified in the range are selected, and the rest receivers are the receivers with the maximum gain.

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