WO2017071264A1 - Receiver and communication terminal - Google Patents

Abstract

The present application provides a receiver and a communication terminal. In the receiver of the present application, a signal reception link comprises, in order, an antenna, a band pass filter, a radio frequency transceiver and a baseband processor. A first low-noise amplifier is arranged between the antenna and the radio frequency transceiver and is configured to perform low-noise amplification processing on a received signal so as to reduce the noise coefficient of the receiver. The baseband processor is configured to emit, when the strength of the received signal is greater than or equal to a predetermined threshold, a first control signal to the first low-noise amplifier, allowing for direct communication with said first low-noise amplifier. A communication terminal using the described receiver is further disclosed in the application. In the communication terminal of the present application, use of the described receiver reduces the noise coefficient in the signal reception link and improves signal reception sensitivity, thereby improving the signal processing efficiency and the communication quality of the communication terminal.

Description

Receiver and communication terminal

cross reference

The present application is hereby incorporated by reference in its entirety in its entirety in its entirety in its entirety in the the the the the the the the the the

Technical field

The present application relates to the field of communications technologies, and in particular, to a receiver and a communication terminal.

Background technique

With the development of communication technology, the use of communication terminals has become more and more popular, and communication between people has become more and more convenient.

In the existing communication technology, the receiver (Transceiver) in the communication terminal is one of the most critical parts of the communication terminal, and the sensitivity of the receiver directly determines the ability of the communication terminal to receive signals, thereby determining the communication quality of the communication terminal. Good or bad. In the prior art, the receiver in the communication terminal receives a signal including an antenna, a band pass filter (BPF), a radio frequency transceiver, and a baseband processor. In the process of receiving signals by the receiver, the signal is first received by the antenna, and the band pass filter filters the received signal to filter out noise outside the signal frequency range; then the RF transceiver performs low noise amplification on the signal and After the mixing process is sent to the baseband processor, the baseband processor decodes the signal, despreads, etc., and provides the final obtained signal to the user.

However, in the existing communication technology, the noise coefficient in the link of the receiver receiving the signal is large, so that the signal receiving sensitivity of the receiver is low.

Summary of the invention

The present application provides a receiver and a communication terminal to overcome the technical problem that the noise coefficient in the link of the receiver receiving signal in the prior art is large, resulting in low receiver sensitivity of the receiver, so as to reduce receiver reception. The noise figure in the signal's link improves the receiver's signal reception sensitivity.

The present application provides a receiver that includes an antenna, a band pass filter, a radio frequency transceiver, and a baseband processor in sequence on a signal receiving link; between the antenna and the radio frequency transceiver A first low noise amplifier is further provided for performing low noise amplification processing on the received signal to reduce a noise figure of the receiver;

And the baseband processor is configured to detect a signal strength of the received signal, and determine whether the signal strength is greater than or equal to the preset threshold; and when the signal strength is greater than or equal to the preset threshold, A first control signal is issued to the first low noise amplifier such that the first low noise amplifier is through.

Further optionally, in the receiver as described above, the baseband processor is further configured to: when detecting that the signal strength of the received signal is less than the preset threshold, to the first low noise The amplifier issues a second control signal to turn off the pass of the first low noise amplifier.

Further optionally, in the receiver as described above, the first low noise amplifier is disposed between the band pass filter and the radio frequency transceiver.

Further optionally, in the receiver as described above, the receiver further includes a first switch, the first switch is disposed between the antenna and the band pass filter; or the switch is disposed at the Between the band pass filter and the first low noise amplifier.

Further optionally, in the receiver as described above, the first low noise amplifier is disposed between the antenna and the band pass filter.

Further optionally, in the receiver as described above, the receiver further includes a second switch, the second switch being disposed between the antenna and the first low noise amplifier; or the switch is disposed at Between the first low noise amplifier and the band pass filter.

Further optionally, in the receiver as described above, the radio frequency transceiver includes a second low A noise amplifier and a mixer, and the mixer is communicatively coupled to the second low noise amplifier and the baseband processor, respectively.

The present application also provides a communication terminal, characterized in that the receiver of the communication terminal employs a receiver as described above.

The receiver and the communication terminal of the present application, wherein the receiver includes an antenna, a band pass filter, a radio frequency transceiver, and a baseband processor in sequence on the signal receiving link; by passing between the antenna of the receiver and the radio frequency transceiver A first low noise amplifier is provided for performing low noise amplification processing on the received signal to reduce a noise figure in the signal receiving link, which can solve the noise figure in the link of the received signal of the receiver in the prior art. Large, resulting in a technical problem of low signal reception sensitivity, thereby reducing the noise figure in the signal receiving link, reducing the sensitivity value of signal reception, thereby improving the sensitivity of signal reception. Meanwhile, the baseband processor in the receiver of the present application is further configured to: when determining that the received signal strength is greater than or equal to a preset threshold, issue a first control signal to the first low noise amplifier, so that the first low noise amplifier is directly connected, thereby The signal blocking can also be prevented while ensuring the sensitivity of signal reception. Therefore, by using the above receiver, the communication terminal of the present application can also reduce the noise figure of the communication terminal, improve the sensitivity of the signal received by the communication terminal, prevent signal jamming, improve the efficiency of signal processing of the communication terminal, and improve the communication terminal. Communication quality.

DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present application, and other drawings can be obtained according to the drawings without any creative labor for those skilled in the art.

FIG. 1 is a schematic structural diagram of an embodiment of a receiver of the present application.

2 is a schematic structural diagram of another embodiment of a receiver of the present application.

FIG. 3 is a schematic structural diagram of still another embodiment of a receiver of the present application.

4 is a schematic structural diagram of still another embodiment of a receiver of the present application.

FIG. 5 is a schematic structural diagram of still another embodiment of a receiver of the present application.

FIG. 6 is a schematic structural diagram of still another embodiment of a receiver of the present application.

detailed description

The technical solutions in the embodiments of the present application are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present application. It is a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without departing from the inventive scope are the scope of the present application.

Embodiment 1

FIG. 1 is a schematic structural diagram of an embodiment of a receiver of the present application. As shown in FIG. 1, the receiver of this embodiment includes an antenna 11, a BPF 12, a radio frequency transceiver 13 and a baseband processor 14 in sequence on the signal receiving link, and the antenna 11 and BPF of the link received by the signal are received. 12. The radio frequency transceiver 13 and the baseband processor 14 are in communication connection. A first low noise amplifier (LNA) 15 is further disposed between the antenna 11 and the radio frequency transceiver 13, and the first LNA 15 is configured to perform low noise amplification processing on the received signal to reduce reception. The noise figure in the signal receiving link of the machine. For example, the receiver shown in FIG. 1 is exemplified by the first LNA 15 being disposed between the BPF 12 and the radio frequency transceiver 13.

In this embodiment, the BPF 11 can be specifically implemented by using a surface acoustic wave (SAW) filter.

In the receiver of this embodiment, on the signal receiving link, the antenna 11 is used to receive signals; the BPF 12 is located behind the antenna 11, and the BPF 12 is used to filter the signal received by the antenna 11 to filter out noise outside the frequency range in which the signal is located. The first LNA 15 is located after the BPF 12, and the first LNA 15 performs low noise amplification processing on the filtered signal; the radio frequency transceiver 13 is located at the first After the LNA 15, the signal after the low noise amplification processing is processed, and finally, the baseband processor 14 performs decoding, despreading, and the like on the signal processed by the radio frequency transceiver 13 to complete the signal reception processing.

The receiver of this embodiment is on the link of the signal reception, and the sensitivity of the received signal can be expressed by the following formula (1):

Sensitivity of received signal = thermal noise power spectral density +10 × lg (subcarrier spacing) + noise figure + demodulation threshold + 10 × lg (requires number of subcarriers) (1)

The thermal noise power spectral density may be -174 dBm/Hz, the subcarrier spacing is 15 KHz, and the demodulation threshold is also constant. The number of required subcarriers is usually allocated by the base station, and in the case where the number of subcarriers is required to be determined, the sensitivity in the signal receiving link of the receiver depends on the noise figure on the entire signal receiving link.

The noise figure cascading formula in the signal receiving link of the receiver of the present embodiment can be expressed as the following formula (2):

NF _sys is the noise figure in the signal receiving link of the receiver; NF _LNA1 is the first LNA15 with a noise figure of about 1 dB, NF _BPF is the insertion loss of BPF12; and the BPF12 insertion loss of each manufacturer is not much different. The value is about 2.5dB. G _LNA1 is the gain of the first LNA 15, and the value is about 12 dB; NF _Transceiver is the noise figure of the radio frequency transceiver 13, and the value is about 2.5 dB.

In FIG. 1, when the first LNA 15 is not provided, the corresponding receiver is a prior art receiver structure, and the noise coefficient cascade formula in the signal receiving link of the receiver can be expressed as the following formula (3). :

NF _sys ≈NF _BPF +NF _Transceiver (3)

The values of the respective parameters are referred to the description of the foregoing embodiments, and details are not described herein again.

The noise coefficient cascading formula (2) in the signal receiving link of the receiver of the present embodiment, The cascading formula (3) of the noise figure in the signal receiving link of the above-mentioned prior art receiver is compared, and the cascading formula of the noise figure in the signal receiving link of the receiver of the present embodiment can be known (2) The resulting noise figure is smaller. Therefore, the noise coefficient obtained by cascading the equation (2) of the noise figure in the signal receiving link of the receiver of the present embodiment is substituted into the formula (1) of the sensitivity of the receiver receiving signal, so that the signal receiving link can be made. The sensitivity is smaller in value, thereby increasing the sensitivity of signal reception. Therefore, in the present embodiment, by increasing the first LNA 15, the noise figure in the signal receiving link of the receiver is reduced, so that the sensitivity value of signal reception can be reduced, thereby improving the sensitivity of signal reception.

In addition, in the receiver of this embodiment, the baseband processor 14 is configured to detect a signal strength of the received signal, and determine whether the signal strength is greater than or equal to a preset threshold; and when the signal strength is greater than or equal to a preset threshold, The first LNA 15 issues a first control signal to pass the first LNA 15 through. In this embodiment, the first LNA 15 is made to pass through, even if the first LNA 15Bypass, that is, the first LNA 15 is directly short-circuited in the signal receiving link, and the received signal is not subjected to low-noise amplification processing. For example, the first control signal sent by the baseband processor 14 to the first LNA 15 in this embodiment may be a general purpose input output (GPIO) control signal, and the first control signal is an enable signal. An LNA 15 is enabled to pass the first LNA 15 through. The preset threshold in this embodiment may be the lowest standard value of the signal that the receiver can receive. When the strength of the signal received by the receiver is lower than the preset threshold, the received signal quality may be problematic, for example, Causes the signal to not decode properly and so on. Therefore, in this embodiment, when the receiver is located at the edge of the cell, the baseband processor 14 detects that the signal strength of the received signal is small, and when the signal strength is less than a preset threshold, the signal receiving link at this time The receiver on the top adopts the structure shown in FIG. 1. Since the signal strength is small at this time, the first LNA 15 performs low-noise amplification processing on the received signal on the signal receiving link, and the signal received by the baseband processor 14 can be enhanced. The strength of the receiver increases the sensitivity of the receiver's received signal.

When the receiver moves from the cell edge to the middle of the cell, the signal strength is gradually increased. If the first LNA 15 continues to perform low-noise amplification on the signal, the signal noise is increased. And increasing the blocking of the signal in the signal receiving link. Therefore, when the baseband processor 14 detects that the signal strength of the received signal is greater than or equal to a preset threshold, the first LNA 15 sends a first control signal to make the first LNA 15 pass through. Even if the first LNA 15Bypass, the first LNA 15 is directly short-circuited in the signal receiving link, and the received signal is not subjected to low-noise amplification processing, and signal blocking in the signal receiving link can be avoided.

The receiver of this embodiment adds a first LNA 15 between the BPF 12 and the radio frequency transceiver 13 as compared with a conventional receiver including only the antenna 11, the BPF 12, the radio frequency transceiver 13 and the baseband processor 14. Since the noise figure is obtained according to the cascade relationship of the components in the entire signal receiving link, by adding the first LNA 15 to the link receiving the signal of the receiver, the noise figure in the signal receiving link can be reduced, The sensitivity value of the small signal reception, thereby improving the sensitivity of signal reception. At the same time, the receiver of the embodiment is further used by the baseband processor 14 to send a first control signal to the first LNA 15 when the received signal strength is greater than or equal to the preset threshold, so that the first LNA 15 is directly connected, thereby ensuring The sensitivity of the signal reception also prevents signal jamming.

Embodiment 2

2 is a schematic structural diagram of another embodiment of a receiver of the present application. As shown in FIG. 2, the receiver of this embodiment further introduces the technical solution of the present application in more detail on the basis of the technical solution of the embodiment shown in FIG.

As shown in FIG. 2, the radio frequency transceiver 13 in this embodiment may include a second LNA 13a and a mixer 13b. The second LNA 13a is located after the first LNA 15 and is communicatively coupled to the first LNA 15; the mixer 13b is respectively associated with The first LNA 15 is in communication with the baseband processor 14. The second LNA 13a is for performing a second low noise amplification process on the signal, the mixer 13b is located after the second LNA 13a, and the mixer 13b is for mixing the signal of the second low noise amplification process according to the baseband frequency. Finally, the baseband processor 14 performs decoding, despreading, and the like on the mixed signal to complete the signal receiving process.

The noise figure in the signal receiving link of the receiver of this embodiment refers to the above-mentioned FIG. Equation (2) of the embodiment; and in FIG. 2, when the first LNA 15 is not provided, the corresponding receiver is the prior art receiver structure, and the noise figure in the signal receiving link of the receiver is referred to the above figure. The formula (3) in the embodiment shown in FIG. 1 is not described in detail in this embodiment. Similarly, the receiver of the present embodiment can make the value of the sensitivity in the signal receiving link smaller as compared with the prior art, thereby improving the sensitivity of signal reception.

In this embodiment, when the receiver returns to the cell edge again from the middle of the cell, when the baseband processor 14 detects that the signal strength of the received signal is less than a preset threshold, the baseband processor 14 issues a second to the first LNA 15. The control signal turns off the direct current of the first LNA 15, and the first LNA 15 acts again in the signal receiving link, and the corresponding signal receiving link is as shown in FIG. 2. The second control signal is also an enable signal that enables the first LNA 15 to turn off the first LNA 15 off.

The receiver in this embodiment detects the signal strength of the received signal by the baseband processor 14 and determines whether the signal strength is greater than or equal to a preset threshold; and when the signal strength is greater than or equal to a preset threshold, the signal strength is better. At this time, the baseband processor 14 sends a first control signal to the first LNA 15 to make the first LNA 15 pass through, and does not perform low noise amplification processing on the signal in the signal receiving link to avoid signal blocking. And when it is detected that the signal strength of the received signal is less than a preset threshold, that is, the signal strength is not good, the baseband processor 14 sends a second control signal to the first LNA 15 to turn off the direct pass of the first LNA 15, and the first LNA 15 is The signal in the signal receiving link performs low noise amplification processing, enhances the strength of the signal received by the baseband processor 14, and improves the sensitivity of the received signal of the receiver.

It should be noted that in the Time Division Duplexing (TDD) communication technology, the receiver can be used not only to receive signals but also as a transmitter to transmit signals. For example, the signal is received in the previous time slot, and the signal is transmitted in the next time slot; or the previous time slot transmits the signal, and the latter time slot receives the signal.

Embodiment 3

FIG. 3 is a schematic structural diagram of still another embodiment of a receiver of the present application. As shown in Figure 3, in order to The first switch 16 can also be provided on the basis of the technical solution of the embodiment shown in FIG. 2, for example, the first switch in this embodiment. The switch 16 can be disposed between the antenna 11 and the BPF 12. For example, in the TDD communication system, switching of the transmission signal and the reception signal can be achieved by setting the first switch 16. In the actual application, the first switch 16 can also be disposed between the BPF 12 and the first LNA 15 , and the implementation principle thereof is similar, and details are not described herein again.

At this time, the noise coefficient cascading formula in the signal receiving link of the receiver of the present embodiment can be expressed as the following formula (4):

The insertion loss of the first switch 16 is represented by the NF _SW , and other parameters are referred to the description of the foregoing embodiment, and details are not described herein again.

In the prior art receiver structure, the first switch 16 is also provided. At this time, the noise coefficient cascade formula in the signal receiving link of the receiver can be expressed as the following formula (5):

NF _sys ≈NF _SW +NF _BPF +NF _Transceiver (5)

The insertion loss of the first switch 16 and the BPF 12 of each manufacturer is not much different. Similarly, with reference to the correlation analysis of the embodiment shown in FIG. 1 above, the noise coefficient cascading formula (4) in the signal receiving link of the receiver of the present embodiment can be known, and the corresponding prior art receiver. The cascading formula (5) of the noise figure in the signal receiving link is compared, and it can be known that the noise figure obtained by the cascading formula (4) of the noise figure in the signal receiving link of the receiver of the present embodiment is smaller. . Therefore, the noise coefficient obtained by cascading the equation (4) of the noise figure in the signal receiving link of the receiver of the present embodiment is substituted into the formula (1) of the sensitivity of the receiver receiving signal, so that the signal receiving link can be made. The sensitivity value is smaller, thereby increasing the sensitivity of signal reception. Moreover, it has been confirmed by experimental data that the receiver of the present embodiment can improve the sensitivity of about 1 dB as compared with the receiver of the prior art.

Embodiment 4

4 is a schematic structural diagram of still another embodiment of a receiver of the present application. As shown in FIG. 4, the difference between the receiver of this embodiment and the receiver of the embodiment shown in FIG. 1 is that the first LNA 15 is disposed between the antenna 11 and the BPF 12 as an example, and correspondingly, the implementation The receiver of the example includes the antenna 11, the first LNA 15, the BPF 12, the radio frequency transceiver 13 and the baseband processor 14 in sequence on the signal receiving link, and the signal received on the link antenna 11, the first LNA 15, BPF 12. The radio frequency transceiver 13 and the baseband processor 14 are in communication connection. The first LNA 15 is used to perform low noise amplification processing on the received signal to reduce the noise figure in the signal receiving link of the receiver. The rest of the structure is the same as the embodiment shown in FIG. 1 . For details, refer to the description of the embodiment shown in FIG. 1 , and details are not described herein again.

In the receiver of this embodiment, on the signal receiving link, the antenna 11 is configured to receive signals; after the first LNA 15 is located behind the antenna 11, the first LNA 15 performs low noise amplification processing on the signal received by the antenna 11; the BPF 12 is located after the first LNA 15 The BPF 12 is used to filter the signal of the first LNA15 low noise amplification processing, and filter out the noise outside the frequency band where the signal is located; the RF transceiver 13 is located after the BPF 12, and processes the filtered signal, and finally the baseband The processor 14 decodes, despreads, and the like the signal processed by the radio frequency transceiver 13 to complete the signal receiving process.

Since the noise figure is obtained according to the cascade relationship of each component in the entire signal receiving link, and the device with the month close to the signal source position has a greater influence on the noise figure, for example, the first-stage device has the greatest influence on the noise figure, and the last one Class devices have the least impact on the noise figure. For example, in the present embodiment, the first LNA 15 plays a dominant role in the noise figure in the signal receiving link of the receiver, and the radio frequency transceiver 13 has the least effect on the noise figure in the signal receiving link of the receiver. Therefore, in the present embodiment, the first LNA 15 is disposed closer to the antenna 11 than the above-described embodiment of FIG. 1, thereby further reducing the noise figure in the signal receiving link, thereby further improving the sensitivity of signal reception.

The noise figure cascading formula in the signal receiving link of the receiver of this embodiment can be expressed as the following formula (6):

Each parameter refers to the description of the above embodiment, and details are not described herein again.

The noise figure (6) in the signal receiving link of the receiver of the present embodiment is smaller than the noise figure (2) in the signal receiving link of the receiver in the embodiment shown in Fig. 1 described above. Therefore, the noise coefficient obtained by the cascaded equation (6) of the noise figure in the signal receiving link of the receiver of the present embodiment is substituted into the sensitivity of the received signal of the receiver as compared with the receiver of the embodiment shown in FIG. In (1), the value of the sensitivity in the signal receiving link can be made smaller, thereby improving the sensitivity of signal reception. Moreover, it has been confirmed by experimental data that the receiver of the present embodiment can improve the sensitivity of about 3 dB as compared with the receiver of the prior art.

The receiver of this embodiment increases the first LNA 15 between the antenna 11 and the BPF 12, since the noise figure is obtained according to the cascade relationship of the components in the entire signal receiving link, in the link receiving the signal at the receiver. By increasing the first LNA 15, the noise figure in the signal receiving link can be reduced, and the sensitivity of signal reception is improved.

Embodiment 5

FIG. 5 is a schematic structural diagram of still another embodiment of a receiver of the present application. As shown in FIG. 5, the receiver of this embodiment further introduces the technical solution of the present application in more detail on the basis of the technical solution of the embodiment shown in FIG.

As shown in FIG. 5, the receiver of the present embodiment adopts the structure of the radio frequency transceiver 13 shown in FIG. 2, that is, the receiver 13 of this embodiment, based on the technical solution of the embodiment shown in FIG. The second LNA 13a and the mixer 13b may be included. For details, refer to the structure of the embodiment shown in FIG. 2, and details are not described herein again.

The noise figure in the signal receiving link of the receiver of this embodiment refers to the formula (6) of the embodiment shown in FIG. 4; and in FIG. 5, the corresponding receiver is the prior art when the first LNA 15 is not provided. The receiver structure, at this time, the noise figure in the signal receiving link of the receiver refers to the formula (3) in the embodiment shown in FIG. 1 , which is not described in this embodiment. Similarly, this embodiment Compared with the prior art, the receiver can make the value of the sensitivity in the signal receiving link smaller, thereby improving the sensitivity of signal reception.

Similarly, as shown in FIG. 5, further optionally, in the receiver of this embodiment, the baseband processor 14 is further configured to detect a signal strength of the received signal, and determine whether the signal strength is greater than or equal to a preset threshold; And when the signal strength is greater than or equal to the preset threshold, the first control signal is sent to the first LNA 15 to make the first LNA 15 pass through. Similarly, in the present embodiment, the first LNA 15 is made to pass through, even if the first LNA 15Bypass, that is, the first LNA 15 is directly short-circuited in the signal receiving link, and the received signal is not subjected to low-noise amplification processing. The first control signal sent by the baseband processor 14 to the first LNA 15 in this embodiment may be a GPIO control signal, and the first control signal is an enable signal capable of enabling the first LNA 15 to make the first LNA 15 pass through. The preset threshold in this embodiment may be the lowest standard value of the signal that the receiver can receive. When the strength of the signal received by the receiver is lower than the preset threshold, the received signal quality may be problematic, for example, Causes the signal to not decode properly and so on. Therefore, in this embodiment, when the receiver is located at the edge of the cell, the baseband processor 14 detects that the signal strength of the received signal is small, and when the signal strength is less than a preset threshold, the signal receiving link at this time The receiver on the top adopts the structure shown in FIG. 2. Since the signal strength is small at this time, the first LNA 15 performs low-noise amplification processing on the received signal on the signal receiving link, and the signal received by the baseband processor 14 can be enhanced. The strength of the receiver increases the sensitivity of the receiver's received signal.

When the receiver moves from the cell edge to the middle of the cell, the signal strength is gradually increased. If the first LNA 15 continues to perform low-noise amplification on the signal, the signal noise is increased, thereby increasing signal blocking in the signal receiving link. Therefore, when the baseband processor 14 detects that the signal strength of the received signal is greater than or equal to the preset threshold, the first LNA 15 is sent a first control signal to make the first LNA 15 pass through, even if the first LNA 15 is bypassed, the first LNA 15 It is directly short-circuited in the signal receiving link, and the received signal is not subjected to low-noise amplification processing, which can avoid signal blocking in the signal receiving link. When the receiver returns to the cell edge again from the middle of the cell, when the baseband processor 14 detects that the signal strength of the received signal is less than a preset threshold The baseband processor 14 sends a second control signal to the first LNA 15 to turn off the direct current of the first LNA 15. At this time, the first LNA 15 functions again in the signal receiving link, and the corresponding signal receiving link is as shown in FIG. 2. The second control signal is also an enable signal that enables the first LNA 15 to turn off the first LNA 15 off.

The receiver in this embodiment detects the signal strength of the received signal by the baseband processor 14 and determines whether the signal strength is greater than or equal to a preset threshold; and when the signal strength is greater than or equal to a preset threshold, the signal strength is better. At this time, the baseband processor 14 sends a first control signal to the first LNA 15 to make the first LNA 15 pass through, and does not perform low noise amplification processing on the signal in the signal receiving link to avoid signal blocking. And when it is detected that the signal strength of the received signal is less than a preset threshold, that is, the signal strength is not good, the baseband processor 14 sends a second control signal to the first LNA 15 to turn off the direct pass of the first LNA 15, and the first LNA 15 is The signal in the signal receiving link performs low noise amplification processing, enhances the strength of the signal received by the baseband processor 14, and improves the sensitivity of the received signal of the receiver.

Embodiment 6

FIG. 6 is a schematic structural diagram of still another embodiment of a receiver of the present application. As shown in FIG. 6, the receiver of this embodiment further introduces the technical solution of the present application in more detail on the basis of the technical solution of the embodiment shown in FIG.

In order to be able to use the receiver of the present embodiment in the communication technology of Time Division Duplexing (TDD), a second switch 17 may be provided between the antenna 11 and the first LNA 15. As shown in FIG. 6, in the present embodiment, the second switch 17 is disposed between the antenna 11 and the first LNA 15.

The noise coefficient cascading formula in the signal receiving link of the receiver of this embodiment can be expressed as the following formula (7):

The second switch 17 of this embodiment can adopt the same switch as the first switch 16 of the embodiment shown in FIG. 3 above, so that the NF _SW can also indicate the insertion loss of the second switch 17, and other parameters refer to the foregoing embodiment. The record is not repeated here.

Similarly, the noise figure (7) in the signal receiving link of the receiver of the present embodiment is compared with the noise figure (5) in the signal receiving link of the receiver in the embodiment shown in FIG. 3, and the noise figure. smaller. Therefore, the noise coefficient obtained by the cascaded equation (7) of the noise figure in the signal receiving link of the receiver of the present embodiment is substituted into the sensitivity of the received signal of the receiver as compared with the receiver of the embodiment shown in FIG. In (1), the value of the sensitivity in the signal receiving link can be made smaller, thereby improving the sensitivity of signal reception. Moreover, it has been confirmed by experimental data that the receiver of the present embodiment can improve the sensitivity of about 3 dB as compared with the receiver of the prior art.

Optionally, in the receiver of this embodiment, the second switch 17 may also be disposed between the first LNA 15 and the BPF 12, and the first LNA 15 is disposed between the antenna 11 and the second switch 17. Moreover, the receivers of any of the above embodiments of FIG. 1 to FIG. 6 can be applied to a receiving link in a TDD communication system.

The present application further provides a communication terminal. The receiver of the communication terminal of the present application adopts the receiver of any of the above embodiments in FIG. 1 to FIG. 6 . For details, reference may be made to the description of the foregoing embodiments, and details are not described herein again.

By using the receiver of the above embodiment, the communication end of the present application can reduce the noise figure of the receiver, improve the sensitivity of signal reception, thereby reducing the noise figure of the communication terminal, improving the sensitivity of the signal received by the communication terminal, and improving communication. The efficiency of terminal signal processing improves the communication quality of the communication terminal.

The device embodiments described above are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, ie may be located in one place. Or it can be distributed to at least two network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without deliberate labor.

Finally, it should be noted that the above embodiments are only for explaining the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present application. range.

Claims (8)

A receiver comprising, in turn, an antenna, a band pass filter, a radio frequency transceiver, and a baseband processor on a signal receiving link; wherein the antenna and the radio frequency transceiver are A first low noise amplifier is further disposed for performing low noise amplification processing on the received signal to reduce a noise figure of the receiver; And the baseband processor is configured to detect a signal strength of the received signal, and determine whether the signal strength is greater than or equal to the preset threshold; and when the signal strength is greater than or equal to the preset threshold, A first control signal is issued to the first low noise amplifier such that the first low noise amplifier is through. The receiver according to claim 1, wherein the baseband processor is further configured to: when it is detected that the signal strength of the received signal is less than the preset threshold, to the first low The noise amplifier issues a second control signal that turns off the pass of the first low noise amplifier. The receiver according to claim 1 or 2, wherein said first low noise amplifier is disposed between said band pass filter and said radio frequency transceiver. The receiver according to claim 3, wherein said receiver further comprises a first switch, said first switch being disposed between said antenna and said band pass filter; or said switch being disposed at The band pass filter is between the first low noise amplifier. The receiver according to claim 1 or 2, wherein said first low noise amplifier is disposed between said antenna and said band pass filter. The receiver according to claim 5, wherein said receiver further comprises a second switch, said second switch being disposed between said antenna and said first low noise amplifier; or said switch setting Between the first low noise amplifier and the band pass filter. A receiver according to claim 1, 2, 4 or 6, wherein said radio frequency transceiver comprises a second low noise amplifier and a mixer, and said mixer is respectively associated with said A second low noise amplifier is communicatively coupled to the baseband processor. A communication terminal, characterized in that the receiver of the communication terminal employs the receiver according to any of claims 1-7.

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