CN101060359B - Antenna selection method and device - Google Patents

Abstract

The invention provides an antenna selection method and device. A priority parameter value is obtained by detecting whether a packet of a signal received by an antenna is locked, the strength of the signal and the noise level. The method of the invention selects the antenna to be used according to the size of the priority parameter value. The device of the invention is provided with a plurality of antenna input ends which are respectively connected with a plurality of antennas so as to receive wireless signals of a plurality of channels. The electronic device comprises a switching module and a tuner, wherein the switching module is controlled by a microprocessor and is used for selecting one of a plurality of antennas to receive wireless signals, and the tuner is used for converting the wireless signals into computer readable signals.

Description

Antenna selection method and device

technical field

The present invention relates to a method and device for antenna selection, in particular, to a method and device for selecting antennas according to packet integrity, signal strength and noise level.

Background technique

At present, many electronic devices have the function of receiving wireless signals, and these devices are generally equipped with antennas to enhance signal receiving performance. However, due to the different directions of the signals transmitted by the base station, or problems such as refraction, diffraction or reflection of the signal, it may cause a problem that one antenna cannot receive all the signals from the base station. Therefore, multiple antennas need to be used to receive wireless signals, but this also creates a problem of choosing which antenna to use.

In US Pat. No. 5,844,632, a diversity receiving device with multiple antennas is disclosed, which selects the antenna with the strongest received signal strength and the lowest analog signal noise for use. However, US5,844,632 only analyzes analog wireless signals, and is not necessarily applicable to digital signals (such as digital TV terrestrial broadcast signals). Furthermore, stronger signal strength does not mean better signal quality, and the strongest signal may not be the best choice due to oversaturation. If the signals overlap due to refraction or diffraction, and the overlapping signal strength is very strong, it may happen that the signal received by the antenna is good, but the data is still not received. In addition, in US5,844,632, one of the antennas is selected to be used after comparing the signals received by all the antennas, and the process is also quite time-consuming.

Therefore, it is necessary to provide an antenna selection method for quickly selecting the most suitable antenna for receiving wireless signals.

Contents of the invention

In view of the problems existing in the prior art, the present invention provides a method and device for antenna selection.

According to one aspect of the present invention, an antenna selection method for an electronic device is provided. The electronic device has a plurality of antenna input terminals for respectively connecting the plurality of antennas to receive wireless signals of a plurality of channels. The method of the present invention includes the following steps: (a) detecting a signal received by one of a plurality of antennas for a channel; (b) judging whether the packet (packet) of the signal received by the antenna is complete, and if so, proceed to step (c), if otherwise return to step (a), continue to detect another antenna; (c) obtain a priority parameter value according to the signal strength and noise size of the received signal; (d) judge whether the priority parameter value falls into A predetermined range, if so, choose to use the antenna and end the detection operation, if otherwise, proceed to step (e); and (e) judge whether all antennas have been detected, if otherwise, return to step (a), and continue to detect another antenna , wherein the noise size represents the error rate of the packet of the received signal, and the priority parameter value is obtained by: pre-dividing the strength value of the signal into a plurality of strength segments; pre-dividing the noise value of the signal into a plurality of noise section; comparing the signal strength and noise of the received signal with the plurality of strength sections and the plurality of noise sections to obtain a strength parameter value and a noise parameter value of the received signal, respectively; and The value of the intensity parameter and the value of the noise parameter are added to obtain the value of the priority parameter.

According to another aspect of the present invention, a circuit for an electronic device is provided. The electronic device has a plurality of antenna input terminals for respectively connecting the plurality of antennas to receive wireless signals of a plurality of channels. The circuit includes: a switch module (switch module), used for coupling to multiple antenna input terminals, wherein the switch module is controlled by a microprocessor to select one of the multiple antennas to receive wireless signals; wherein the microprocessor According to the priority parameter value of each antenna, the switching module is controlled to select one of the antennas to receive wireless signals, and the microprocessor is used to: (a) detect a signal received by one of the plurality of antennas for a channel; b) Judging whether the packet of the signal received by one of the antennas is complete, if so, proceed to step (c), otherwise return to step (a), and continue to detect another antenna; (c) according to the signal of the received signal intensity and noise size to obtain a priority parameter value; (d) judge whether the priority parameter value falls within a predetermined range, if so, choose to use the antenna and end the detection operation, otherwise proceed to step (e); and (e ) to determine whether all antennas have been detected, otherwise return to step (a) and continue to detect another antenna, wherein the noise level represents the error rate of the packet of the received signal, and the priority parameter value is obtained as follows: The strength value of the signal is pre-divided into a plurality of strength segments; the noise value of the signal is pre-divided into a plurality of noise segments; the signal strength and noise of the received signal are compared with the plurality of strength segments and the plurality of noise regions segment comparison to obtain a strength parameter value and a noise parameter value of the received signal respectively; and adding the strength parameter value and the noise parameter value to obtain the priority parameter value.

According to still another aspect of the present invention, an electronic device is provided. The electronic device has a plurality of antenna input ends, which are used to respectively connect the plurality of antennas to receive wireless signals of a plurality of channels. The electronic device includes: a switching module coupled to multiple antenna input terminals; a microprocessor controlling the switching module to select one of the multiple antennas to receive wireless signals; wherein the microprocessor is based on the priority parameters of each antenna value, and control the switching module to select one of the antennas to receive wireless signals, the microprocessor is used for: (a) detecting the signal received by one of the multiple antennas for a channel; (b) judging the one of the antennas Whether the packet of the signal received by an antenna is complete, if so, proceed to step (c), otherwise return to step (a), and continue to detect another antenna; (c) according to the signal strength and noise size of the received signal, and Obtaining a priority parameter value; (d) judging whether the priority parameter value falls within a predetermined range, if so, selecting to use the antenna and ending the detection operation, otherwise proceeding to step (e); and (e) judging whether all antennas are After the detection is completed, if otherwise, return to step (a) and continue to detect another antenna, wherein the noise level represents the error rate of the packet of the received signal, and the priority parameter value is obtained by the following: the strength value of the signal is pre-differentiated It is a plurality of strength sections; the noise value of the signal is pre-divided into a plurality of noise sections; the signal strength and noise of the received signal are compared with the plurality of strength sections and the plurality of noise sections, and respectively obtained a strength parameter value and a noise parameter value of the received signal; and adding the strength parameter value and the noise parameter value to obtain the priority parameter value.

In conjunction with the description of the following preferred embodiments and the accompanying drawings, the purpose, embodiments, features, and advantages of the present invention will become clearer.

Description of drawings

Fig. 1 is a wireless signal receiving system represented according to the present invention;

Fig. 2 is an embodiment of the circuit module shown in Fig. 1;

FIG. 3 is a flowchart of a method for determining a priority parameter value of an antenna according to the present invention;

FIG. 4 shows a flow chart of a method for illustrating a method for selecting an antenna according to the priority parameter values determined in FIG. 3 when an electronic device is turned on; and

FIG. 5 shows a flow chart of a method for illustrating a method for selecting an antenna according to the priority parameter values determined in FIG. 3 when an electronic device switches receiving channels.

Explanation of symbols in drawings

100. Wireless signal receiving system

112, 114, 212, 214, 216, antenna

120, electronic device 122, 124, input terminal

130, 230, circuit module 140, 240, switching module

150, 250, tuner 160, processor

242. Switcher 244. Amplifier

246. Signal transmission line

Detailed ways

The invention discloses an antenna selection method and device. In order to make the description of the present invention more detailed and complete, reference may be made to the following description together with the accompanying drawings of FIG. 1 to FIG. 5 . However, the devices, components and method steps described in the following embodiments are only used to illustrate the present invention, and are not intended to limit the scope of the present invention.

FIG. 1 shows a wireless signal receiving system 100 according to the present invention, including an electronic device 120 and antennas 112 and 114 for receiving wireless signals. The electronic device 120 may be, for example, a digital TV, a set-top box, or a personal computer equipped with a terrestrial TV broadcast tuner card or a satellite TV broadcast receiver card. According to different types of applications, the antennas 112 and 114 can be designed to receive different types of wireless signals, such as digital terrestrial broadcast signals, digital satellite broadcast signals, or other radio frequency signals. In addition, the antennas 112 and 114 can be various known antenna structures, such as patch antennas, helical antennas, etc., and are not limited to single-band, dual-band, or multi-band antennas. The electronic device 120 includes two antenna input terminals 122 and 124 for connecting the antennas 112 and 114 respectively. In another embodiment of the present invention, the wireless signal receiving system 100 may include N (greater than 2) antennas, and the electronic device 120 also has corresponding N antenna input terminals for connecting to the N antennas respectively, and the N The antenna input ports can be dispersed in different parts (eg top or side) of the electronic device 120 to receive wireless signals from different directions.

The electronic device 120 further includes a circuit module 130 and a processor 160 , wherein the circuit module 130 includes a switching module 140 and a tuner 150 . The switching module 140 is connected to the antenna input terminals 122 and 124 to receive signals from the respective antennas. Under the control of the processor 160 , the switching module 140 can switch the antennas, so that the wireless signal from one of the antennas is transmitted to the tuner 150 . In addition to controlling the switching module 140 to switch the antennas, the processor 160 can also determine whether the antennas 112 and 114 are normally connected to the antenna input terminals 122 and 124 according to the signal received by the switching module 140 . If all antennas are not connected to the electronic device 120, the processor 160 may generate a prompt signal to remind the user that no antenna is available. The tuner 150 is used to adjust the frequency of the wireless signal for subsequent signal demodulation and image processing. Depending on its application, the tuner 150 can be, for example, a digital television tuner (DTV tuner) or a satellite radio tuner (satellite radio tuner). Taking digital TV as an example, the electronic device 120 can be used to receive and process radio frequency signals transmitted in various transmission standards, such as DVB (Digital Video Broadcasting) standard, ATSC (Advanced Television Systems Committee )) standard, or Integrated Services Digital Broadcasting (ISDB (Integrated Services Digital Broadcasting)) standard.

FIG. 2 is an embodiment of the circuit module shown in FIG. 1 . In FIG. 2 , the circuit module 230 includes a switching module 240 and a tuner 250 , wherein the switching module 240 further includes a switcher 242 and an amplifier 244 . The switch 242 is connected to the first antenna 212 , the second antenna 214 to the Nth antenna 216 for transmitting the wireless signal received by one of the antennas to the amplifier 244 . These antennas can be used to receive wireless signals on multiple channels. The amplifier 244 is used to selectively amplify the wireless signal from the switcher 242 , wherein the amplifier 244 can be, for example, a well-known low noise amplifier with variable gain. The switcher 242 and the amplifier 244 are connected to a processor (not shown) through the signal transmission line 246, and the processor can be used to determine whether each antenna exists, and can control the switcher 242 to select which antenna according to the signal received by each antenna And control the amplifier 244 whether to amplify the signal strength. For different channels, the processor can control the switcher 242 to select different antennas. It should be noted that the switcher 242 and the amplifier 244 can also communicate with the processor through different signal transmission lines, and the present invention does not limit the communication method.

The present invention determines which antenna to use according to the priority parameter value of each antenna. FIG. 3 is a flowchart of a method for determining a priority parameter value of an antenna according to the present invention. First, in step S310, the strength of a signal received by an antenna is detected. The present invention divides the signal strength into multiple sections in advance, and then assigns different parameters to the multiple sections according to the applicability of the strength. A strength parameter value can be obtained by comparing the strength of the signal received by the antenna with each preset strength range. The division of strength zones will vary according to different application systems. For example, assign parameter value 2 to segments with intensity between 0dBm (decibel milliwatts) and -75dBm, assign parameter value 1 to segments with intensity greater than 0dBm, and assign parameter value 0 to segments with intensity less than -75dBm segment. In this example, if the strength of the signal received by the antenna is -50dBm, its strength parameter value is 2. In another embodiment, the signal strength can be divided into 5 sections in advance, and parameter values 4, 3, 2, 1, and 0 are respectively assigned to each section according to its applicability. The present invention does not limit the number of strength sections and their division methods. Those skilled in the art can divide different sections according to different applications, and then specify different parameter values according to the applicability of each section. The segment with a higher degree of applicability has a higher parameter value. It should be noted that the stronger the strength does not mean the better the signal, if the signal strength is too strong, it may lead to oversaturation.

Next, in step S320, the magnitude of the noise value received by an antenna is detected. The present invention divides the noise value into multiple sections in advance, and then assigns different parameters to the multiple sections according to the magnitude of the noise value. A noise parameter value is obtained by comparing the noise value received by the antenna with each preset noise segment. According to an embodiment of the present invention, the noise represents the size of the packet error rate (packet error rate), that is, the ratio of lost bits during signal transmission and reception. The division of noise zones will vary from system to system. For example, specify a parameter value of 1 for segments with a noise value less than 5×10 ^-3 packet error rate (i.e., 5 out of every 1000 bits not received), and a parameter value of 0 for a noise value greater than 5×10 ^-3 Sections for Packet Error Rate. In this example, if the noise value of the signal received by the antenna is 1×10 ^-3 , then its noise parameter value is 1. In another embodiment, the noise value can be divided into 4 sections in advance, and parameter values 0, 1, 2, and 3 are respectively assigned to each section according to the size of the noise value. The present invention does not limit the number of noise sections and their division methods. Those skilled in the art can divide different sections according to different applications, and then specify different parameter values according to the applicability of each section. The segment with lower noise value has higher parameter value.

Next, in step S330, it is determined whether the signal packet received by the antenna is locked (lock). Whether the packet is locked depends on whether the complete signal can be received. For example, in a series of received bit streams (bit stream), the synchronization byte (sync byte) in the header (header) must be correctly identified, and after the synchronization byte is recognized, it must be readable. The following fixed-length bit data is regarded as a complete packet received and locked. However, the number of bits in which the synchronization byte needs to be correctly confirmed to be considered locked is not limited by the present invention, but is determined by various practical applications. Next, in step S340, the priority parameter value of the antenna is determined. If it is determined in step S330 that the signal packet received by the antenna is locked, then the priority parameter value of the antenna will be set to the value obtained by adding the strength parameter value and the noise parameter value. If it is determined in step S330 that there is no lock, the priority parameter value of the antenna will be set to zero. Among them, the maximum value of the priority parameter is the maximum value of the strength parameter plus the maximum value of the noise parameter. In other words, if the signal received by the antenna has the most appropriate strength and the minimum noise value, then the priority parameter of the antenna The value is equal to a predetermined maximum value.

FIG. 4 shows a flow chart of a method for illustrating a method for selecting an antenna according to the priority parameter value determined in FIG. 3 when an electronic device is turned on. The electronic device of the present invention has a plurality of antenna input terminals for respectively connecting the plurality of antennas to receive wireless signals of a plurality of channels. For a channel, an antenna with better reception effect can be selected for reception. Once the electronic device is turned on, its internal circuit will execute the method steps shown in FIG. 4 . First, in step S400, it is detected whether there is an antenna installed on the electronic device, that is, whether the antenna is normally connected to the antenna input end of the electronic device. If no antenna is installed, the process proceeds to step S405, and the electronic device generates a prompt signal to inform the user that no antenna is available. If it is detected that any antenna has been installed on the electronic device, the procedure proceeds to step S410 to perform an initialization operation, and set the priority parameter value of the installed antenna to zero. Next, in step S415, it is determined whether all the channels have been detected, and if so, the procedure proceeds to step S420, and the method ends. If not, the procedure proceeds to step S425 to select one of the undetected channels for detection. Generally speaking, the channels are arranged according to the serial numbers, and the method of the present invention can select the channels to detect sequentially according to the serial numbers of the channels, but is not limited to the order. Next, in step S430, for the channel selected in step S425, an antenna that has been installed but not yet detected is selected. Generally speaking, all the antennas can be numbered in advance, and the antennas are selected in sequence according to the size of the serial numbers for detection. In step S435, the priority parameter value of the antenna selected in step S430 is calculated, and it is determined whether the priority parameter value is equal to a predetermined maximum value. The calculation method of the priority parameter value has been described in the description related to FIG. 3 , so it will not be repeated. In step S435, if the determination is yes, the procedure proceeds to step S440, setting the antenna as the antenna for receiving the wireless signal of the currently detected channel, and storing the priority parameter value of the antenna. Then, the procedure returns to step S415 to detect other channels. According to the present invention, for any specific channel, as soon as an antenna whose priority parameter value is equal to the predetermined maximum value is found, the detection for the specific channel is stopped, and the priority parameter values of other antennas are no longer judged, so the detection speed can be accelerated. So, at the end, there may still be some antennas that haven't been tested yet. However, in other embodiments, for the specific channel, the antenna to be used may be determined after all antennas are detected.

If the judgment result of step S435 is negative, then the procedure proceeds to step S445 to store the priority parameter value of the detected antenna for use in subsequent steps. Next, in step S450, for the selected channel, it is determined whether all installed antennas have been detected, if not, return to step S430 to select other antennas for detection. If yes, the procedure proceeds to step S455, and the antenna with the relatively largest priority parameter value is selected according to the priority parameter values of each antenna recorded in step S445. If the priority parameter values of more than two antennas are the same and both are relative maximum values, one of them will be selected, and the selection method depends on the application, which is not limited by the present invention. For example, it can be selected according to the antenna serial number, the value of the strength parameter or the value of the noise parameter, or it can be set to be randomly selected. Then, the procedure returns to step S440, and the antenna selected in step 455 is set as the antenna for receiving the wireless signal of the currently detected channel, and the priority parameter value of the antenna is stored.

When the electronic device of the present invention is turned on, the method shown in FIG. 4 can be automatically executed to record the antennas to be used by each channel. The present invention also provides an antenna selection method for the electronic device when switching channels to be received, as shown in FIG. 5 . FIG. 5 shows a flow chart of a method for illustrating a method for selecting an antenna according to the priority parameter values determined in FIG. 3 when an electronic device switches channels to be received. When the electronic device is turned on, the method steps shown in FIG. 4 are executed, and the antennas to be used for each channel and their priority parameter values are recorded. As mentioned above, when the electronic device switches from channel A to channel B, its internal circuit will execute the method steps shown in FIG. 5 . First, in step S500, it is judged whether the priority parameter value of the antenna (method in FIG. 3) set by channel B (method in FIG. 4) for receiving wireless signals is a predetermined maximum value. If yes, the procedure proceeds to step S505, and the electronic device uses the set antenna to receive the channel B signal. If not, the procedure proceeds to step S510 , for the channel B, one of the installed antennas is selected for detection. In step S515, the priority parameter value of the antenna selected in step S510 is calculated, and it is judged whether the priority parameter value is equal to a predetermined maximum value. The calculation method of the priority parameter value is the same as that in Fig. 3, so it will not be repeated. If yes, the procedure proceeds to step S520, using the antenna to receive the channel B signal, and recording the antenna and its priority parameter value. If the judgment result of step S515 is negative, the process proceeds to step S525 to store the priority parameter value of the detected antenna for use in subsequent steps. Next, in step S530, for channel B, it is determined whether all installed antennas have been detected, if not, return to step S510 to select other antennas for detection. If yes, the procedure proceeds to step S535, and the antenna with the relatively largest priority parameter value is selected according to the priority parameter values of each antenna recorded in step S520. If the priority parameter values of more than two antennas are the same and are relatively maximum values, one of the antennas can be selected according to the antenna serial number, strength parameter value or noise parameter value, or can be selected randomly.

To sum up, according to the present invention, when the electronic device is turned on, it automatically scans the antenna for each channel, and sets a different antenna for each channel. When switching channels, the electronic device will first select the antenna set during power-on scanning, and if the priority parameter value of the antenna is less than the predetermined maximum value, then detect other antennas to determine whether to switch antennas. In addition, the present invention detects whether an antenna is installed as soon as it is turned on. If no antenna is detected, the user is notified to install it. There is no need to wait until all channels have been scanned for antennas to find out that no signal can be received. Moreover, when scanning the antennas, the electronic device only detects the installed antennas, so that the detection and switching of the antennas are more efficient. Finally, in terms of hardware, it is only necessary to add a switching module (such as the element 140 in FIG. 1 ) to the existing architecture, and with appropriate software control, the present invention can be realized without adding too much cost.

In another embodiment of the present invention, the predetermined maximum value of the priority parameter value may be replaced by a predetermined range, and as long as the priority parameter value of the antenna falls within the predetermined range, the antenna is selected for use. For example, the predetermined maximum value and the predetermined second maximum value of the priority parameter value can be set to a predetermined range, so in step S435 of FIG. 4 , if the priority parameter value of the detected antenna is equal to the predetermined maximum value or the predetermined second maximum value , then choose to use the antenna.

In another embodiment of the present invention, in addition to the method of selecting the antenna when starting up and switching channels, the electronic device can also use the idle time of the machine to execute the method shown in Figure 4 or Figure 5 at any time to check the Whether the priority parameter value of the antenna is changed.

Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope is as defined by the appended claims.

Claims (17)

1. An antenna selection method for an electronic device, the electronic device has a plurality of antenna input terminals for respectively connecting a plurality of antennas to receive wireless signals of a plurality of channels, the method comprises the following steps: (a) detecting a signal received by one of the plurality of antennas for a frequency channel; (b) judging whether the package of the signal received by one of the antennas is complete, if so, proceed to step (c), otherwise return to step (a), and continue to detect another antenna; (c) obtaining a priority parameter value according to the signal strength and noise level of the received signal; (d) judging whether the priority parameter value falls within a predetermined range, if so, select to use the antenna and end the detection operation, if not, proceed to step (e); and (e) Judging whether all antennas have been detected, if not, return to step (a) and continue to detect another antenna, Wherein the noise size represents the packet error rate size of the received signal, and the priority parameter value is obtained by: Divide the strength value of the signal into a plurality of strength segments in advance; Pre-divide the noise value of the signal into multiple noise segments; comparing the signal strength and noise of the received signal with the plurality of strength bins and the plurality of noise bins to obtain a strength parameter value and a noise parameter value of the received signal, respectively; and The priority parameter value is obtained by adding the intensity parameter value and the noise parameter value. 2. The method as claimed in claim 1, wherein in this step (a) also comprises the following steps: (x1) Detecting whether the plurality of antennas are normally connected to the input terminals of the plurality of antennas, wherein only the antennas that are normally connected will perform the subsequent steps, and the antennas that are not normally connected will not perform the subsequent steps. 3. method as claimed in claim 2, wherein in this step (x1) also comprises the following steps: (x2) If all of the plurality of antennas are not properly connected to the plurality of antenna input terminals, the electronic device generates a prompt signal to indicate that no antenna is installed. 4. method as claimed in claim 3, wherein this step (e) also comprises the following steps: (e1) If all the antennas are detected, one of the antennas is selected for use according to the value of the priority parameter obtained for each antenna. 5. The method of claim 4, further comprising the steps of: (f) record the selected antenna and the priority parameter value of the antenna is smaller than that in the electronic device; and (g) For another channel, repeat step (a) until the antennas used by all channels are recorded. 6. The method as claimed in claim 5, wherein steps (a) to (g) are executed every time the electronic device is turned on. 7. The method of claim 5, further comprising the steps of: (h) When switching to the next channel, judge whether the priority parameter value of the recorded antenna of the next channel falls within the predetermined range, if so, use the recorded antenna to receive wireless signals, otherwise proceed to step ( i); (i) Repeat steps (a) to (f) to select one of the antennas to receive the wireless signal. 8. method as claimed in claim 7, wherein this step (h) also comprises the following steps: (h1) When the channel is not switched, check whether the priority parameter value of the antenna used decreases every predetermined time, and if so, repeat steps (a) to (f) to select another antenna for use. 9. A circuit for an electronic device, the electronic device has a plurality of antenna input terminals for respectively connecting a plurality of antennas to receive wireless signals of a plurality of channels, the circuit comprising: a switching module, used to be coupled to the plurality of antenna input terminals, wherein the switching module is controlled by a microprocessor to select one of the plurality of antennas to receive wireless signals; Wherein the microprocessor controls the switching module to select one of the antennas to receive the wireless signal according to the priority parameter value of each antenna, and the microprocessor is used for: (a) detecting a signal received by one of the plurality of antennas for a frequency channel; (b) judging whether the package of the signal received by one of the antennas is complete, if so, proceed to step (c), otherwise return to step (a), and continue to detect another antenna; (c) obtaining a priority parameter value according to the signal strength and noise level of the received signal; (d) judging whether the priority parameter value falls within a predetermined range, if so, select to use the antenna and end the detection operation, if not, proceed to step (e); and (e) Judging whether all antennas have been detected, if not, return to step (a) and continue to detect another antenna, Wherein the noise size represents the packet error rate size of the received signal, and the priority parameter value is obtained by: Divide the strength value of the signal into a plurality of strength segments in advance; Pre-divide the noise value of the signal into multiple noise segments; comparing the signal strength and noise of the received signal with the plurality of strength bins and the plurality of noise bins to obtain a strength parameter value and a noise parameter value of the received signal, respectively; and The priority parameter value is obtained by adding the intensity parameter value and the noise parameter value. 10. The circuit of claim 9, wherein the switching module comprises: a switcher connected to the plurality of antenna input terminals, wherein the microprocessor is coupled to the switcher to determine whether the plurality of antennas are normally connected to the plurality of antenna input terminals; and An amplifier, connected to the switch, is used to amplify the strength of the received wireless signal, wherein the microprocessor is coupled to the amplifier to control whether to amplify the received wireless signal. 11. The circuit as claimed in claim 9, wherein one of the plurality of antenna input terminals is disposed on the top of the electronic device, and the other of the plurality of antenna input terminals is disposed on two sides of the electronic device. 12. An electronic device having a plurality of antenna input terminals for respectively connecting a plurality of antennas to receive wireless signals of a plurality of channels, the electronic device comprising: a switching module coupled to the plurality of antenna inputs; and a microprocessor, controlling the switching module to select one of the plurality of antennas to receive wireless signals; Wherein the microprocessor controls the switching module to select one of the antennas to receive the wireless signal according to the priority parameter value of each antenna, and the microprocessor is used for: (a) detecting a signal received by one of the plurality of antennas for a frequency channel; (b) judging whether the package of the signal received by one of the antennas is complete, if so, proceed to step (c), otherwise return to step (a), and continue to detect another antenna; (c) obtaining a priority parameter value according to the signal strength and noise level of the received signal; (d) judging whether the priority parameter value falls within a predetermined range, if so, select to use the antenna and end the detection operation, if not, proceed to step (e); and (e) Judging whether all antennas have been detected, if not, return to step (a) and continue to detect another antenna, Wherein the noise size represents the packet error rate size of the received signal, and the priority parameter value is obtained by: Divide the strength value of the signal into a plurality of strength segments in advance; Pre-divide the noise value of the signal into multiple noise segments; comparing the signal strength and noise of the received signal with the plurality of strength bins and the plurality of noise bins to obtain a strength parameter value and a noise parameter value of the received signal, respectively; and The priority parameter value is obtained by adding the intensity parameter value and the noise parameter value. 13. The electronic device as claimed in claim 12, wherein the switching module comprises: a switcher connected to the plurality of antenna input terminals, wherein the microprocessor is coupled to the switcher to determine whether the plurality of antennas are normally connected to the plurality of antenna input terminals; and An amplifier, connected to the switch, is used to amplify the strength of the received wireless signal, wherein the microprocessor is coupled to the amplifier to control whether to amplify the received wireless signal. 14. The electronic device as claimed in claim 12, wherein one of the plurality of antenna input terminals is placed on the top of the electronic device, and the other of the plurality of antenna input terminals is placed on both sides of the electronic device . 15. An antenna selection method for an electronic device, the electronic device has a plurality of antennas to receive a wireless signal of a first channel, the method comprising the following steps: (a) detecting a signal received by a first antenna for the first channel; (b) judging whether the packet of the signal received by the first antenna is complete, if so, proceed to step (c), otherwise return to step (a), and continue to detect a second antenna; (c) obtaining a first priority parameter value according to the signal strength and noise level of the signal received by the first antenna; (d) judging whether the first priority parameter value falls within a preset value range, if so, the electronic device selects to use the first antenna and ends the detection operation, otherwise proceeds to step (e); and (e) judging whether all antennas have been detected, if not, return to step (a) and continue to detect the second antenna, Wherein the noise size represents the packet error rate size of the received signal, and the priority parameter value is obtained by: Divide the strength value of the signal into a plurality of strength segments in advance; Pre-divide the noise value of the signal into multiple noise segments; comparing the signal strength and noise of the received signal with the plurality of strength bins and the plurality of noise bins to obtain a strength parameter value and a noise parameter value of the received signal, respectively; and The priority parameter value is obtained by adding the intensity parameter value and the noise parameter value. 16. The method as claimed in claim 15, wherein in the step (a), further comprising the following steps: (x1) Detecting whether the plurality of antennas are working normally, wherein the antennas that work normally will go to the next step, and the antennas that cannot work normally will not go to the next step. 17. The method as claimed in claim 15, wherein in this step (x1) also comprises the following steps: (x2) If all the multiple antennas fail to work normally, the electronic device generates a prompt signal to indicate that no antenna works normally.

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