CN115733507A

CN115733507A - Wireless communication device

Info

Publication number: CN115733507A
Application number: CN202111016092.9A
Authority: CN
Inventors: 廖威
Original assignee: Nanning Fulian Fugui Precision Industrial Co Ltd
Current assignee: Nanning Fulian Fugui Precision Industrial Co Ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2023-03-03

Abstract

A wireless communications apparatus, comprising: an antenna for receiving and transmitting signals; the radio frequency chip is electrically connected with the antenna, is used for identifying the type of the signal received by the antenna and is also used for processing the signal; a coupler electrically connected to the antenna for coupling the signal; the sharing unit is electrically connected between the radio frequency chip and the coupler and used for receiving the signals coupled by the coupler and selecting signal receiving paths with different attenuation amounts according to the types of the signals, so that the problem that the LTE NB-IoT and the EGPRS cannot be compatible is solved.

Description

Wireless communication device

Technical Field

The invention relates to the technical field of communication, in particular to a wireless communication device.

Background

According to the requirements of the 3GPP 36.521 standard, the LTE NB-IoT maximum transmission power needs to meet the following requirements of Class 3 or Class 5.

Class 3(dBm)	Tolerance(dB)	Class 5(dBm)	Tolerance(dB)
				23	±2.7	20	±2.7

However, according to the 3gpp TS 45.005 standard requirement, the 2G (EGPRS) maximum transmission power needs to meet the following requirements of Class 2 or Class 4.

Class 2(dBm)	Tolerance(dB)	Class 4(dBm)	Tolerance(dB)
				8W(39dBm)	±2.5	2W(33dBm)	±2.5

It can be seen that the maximum transmit power requirements for the two wireless technologies are very different, for example compared to LTE NB-IoT Class 5=20dbm, but 2G (EGPRS) Class 2=39dbm,

this gap is 19dBm, but for a typical rf front end core, the accuracy of the input feedback power detector is typically only 6 dBm. This presents challenges to how to design a radio frequency coupler line to be compatible with both LTE NB-IoT and 2G (EGPRS) wireless technologies.

Disclosure of Invention

In view of the above, there is a need for a wireless communication device that solves the problem of incompatibility between LTE NB-IoT and EGPRS.

A wireless communication apparatus according to an embodiment of the present invention includes:

an antenna for receiving and transmitting signals;

the radio frequency chip is electrically connected with the antenna, is used for identifying the type of the signal received by the antenna and is also used for processing the signal;

a coupler electrically connected to the antenna for coupling the signal;

and the sharing unit is electrically connected between the radio frequency chip and the coupler and used for receiving the signals coupled by the coupler and selecting signal receiving paths with different attenuation amounts according to the types of the signals.

Preferably, the common unit includes:

the attenuator is electrically connected with the coupler and is used for attenuating the power value of the signal to a preset value;

the single-pole double-throw switch comprises an input end, a first output end and a second output end, wherein the input end is electrically connected with the attenuator, the first output end is grounded through a first capacitor and a first resistor which are sequentially connected in series, and the second output end is electrically connected with the radio frequency chip.

Preferably, when the radio frequency chip identifies that the signal received by the antenna is an LTE signal, the single-pole double-throw switch is switched to the second output port, and the LTE signal is directly input to the radio frequency chip through the single-pole double-throw switch;

when the radio frequency chip identifies that the signal received by the antenna is EGPRS, the single-pole double-throw switch is switched to the first output port, and the EGPRS signal is coupled from the first output port to the second output port through the single-pole double-throw switch to be input to the radio frequency chip.

Preferably, the single pole double throw switch further comprises:

the first control end is electrically connected with the radio frequency chip;

the second control end is electrically connected with the radio frequency chip through a not gate, and the radio frequency chip outputs control signals to the first control end and the second control end according to the type of the signals so as to control the single-pole double-throw switch to switch signal receiving paths with different attenuation amounts.

Preferably, the single-pole double-throw switch further comprises a control unit, and the single-pole double-throw switch further comprises a first control end and a second control end;

the first control end is electrically connected to the control unit;

the second control end is electrically connected to the control unit through a not gate, and the control unit outputs a control signal to the first control end and the second control end according to the type of the signal so as to control the single-pole double-throw switch to switch signal receiving paths with different attenuation amounts.

Preferably, the coupler is a directional coupler.

Preferably, the attenuator is a PI type attenuator.

Compared with the prior art, the wireless communication device provided by the embodiment of the invention identifies the type of the signal received by the antenna through the radio frequency chip, further couples the signal to the sharing unit through the coupler, and selects the signal receiving paths with different attenuation amounts according to the type of the signal through the sharing unit, so that the power of the signal input into the radio frequency chip 101 can be controlled to be about 20dBm of the difference between LTE NB-IoT and EGPRS, and the purpose of coexistence design is achieved.

Drawings

Fig. 1 is a block diagram of a wireless communication device according to an embodiment of the invention.

Fig. 2 is a block diagram of another embodiment of a wireless communication device according to the present invention.

Description of the main Components

Wireless communication device 10

Antenna 100

Radio frequency chip 101

Coupler 102

Common unit 103

Attenuator 1031

Single-pole double-throw switch 1032

Input terminal in

First output terminal out1

Second output terminal out2

First capacitor C1

A first resistor R1

First control terminal crl1

Second control terminal crl2

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

Referring to fig. 1, fig. 1 is a schematic structural diagram of a wireless communication device 10 according to an embodiment of the present invention. In the present embodiment, the wireless communication device 10 is compatible with both LTE NB-IoT and 2G (EGPRS). The wireless communication device 10 includes an antenna 100, a radio frequency chip 101, a coupler 102, and a common unit 103.

In this embodiment, the antenna 100 is used for receiving and transmitting signals, which include LTE signals and EGPRS signals. The rf chip 101 is electrically connected to the antenna 100, and is configured to identify a type of a signal received by the antenna 100 and process the signal. And a coupler 102 electrically connected to the antenna 100 for coupling the signal. The line of the antenna 100 directly connected to the rf chip 101 is a main line, the line of the antenna 100 connected to the rf chip 101 through the sharing unit 103 is an auxiliary line, and the coupler 102 couples the signal of the main line to the auxiliary line. In one embodiment of the present invention, coupler 102 is a directional coupler. And the sharing unit 103 is electrically connected between the radio frequency chip 101 and the coupler 102, and is used for receiving the signal coupled by the coupler 102 and selecting signal receiving paths with different attenuation amounts according to the type of the signal. The signal receiving path comprises a first receiving path and a second receiving path, the isolation degree of the first receiving path and the second receiving path is 20dB, and the power difference between an LTE signal and an EGPRS signal is met.

Referring to fig. 2, fig. 2 is a schematic structural diagram of another embodiment of the wireless communication device 10 according to the present invention. In the present embodiment, the wireless communication device 10 includes an antenna 100, an rf chip 101, a coupler 102, and a common unit 103. The working principle of the antenna 100, the rf chip 101, the coupler 102 and the sharing unit 103 is similar to that of the above embodiments, and is not described herein again.

In this embodiment, the sharing unit 103 includes an attenuator 1031 and a single-pole double-throw switch 1032. The attenuator 1031 is electrically connected to the coupler 102, and is configured to attenuate the power value of the signal to a preset value, where the preset value may be set according to an actual requirement. Attenuator 1031 may be a PI type attenuator. The single-pole double-throw switch 1032 includes an input end in, a first output end out1, and a second output end out2, the input end in is electrically connected to the attenuator 1031, the first output end out1 is grounded through a first capacitor C1 and a first resistor R1 which are sequentially connected in series, and the second output end out2 is electrically connected to the rf chip 101. Specifically, when the rf chip 101 recognizes that the signal received by the antenna 100 is an LTE signal, the single-pole double-throw switch 1032 is switched to the second output port out2, and the LTE signal is directly input to the rf chip 101 through the single-pole double-throw switch 1032. At this time, the LTE signal input to the spdt switch 1032 has only the insertion loss of the spdt switch, and is generally about 0.4dB. When the radio frequency chip 101 recognizes 100 that the signal received by the antenna is EGPRS, the single-pole double-throw switch 1032 is switched to the first output port out1, and the EGPRS signal is coupled from the first output port out1 to the second output port out2 through the single-pole double-throw switch 1032 to be input to the radio frequency chip 101. The first output end out1 is grounded through a first capacitor C1 and a first resistor R1 which are sequentially connected in series, so that a signal which is equivalent to the input of the first output end out1 is blocked, and at this time, the EGPRS signal is coupled to the second output end out2 through the internal control of the single-pole double-throw switch 1032, and since the isolation of a general single-pole double-throw switch device is 20dB, a signal which is equivalent to the input of the radio frequency chip 101 is attenuated by 20dB, so that the power of the signal which is input to the internal of the radio frequency chip 101 can be controlled to be 20dBm different from LTE NB-IoT and EGPRS, thereby achieving the purpose of coexistence design.

In this embodiment, the single pole, double throw switch 1032 further comprises a first control terminal rl1 and a second control terminal rl2. The first control terminal crl1 is electrically connected to the rf chip 101, and the second control terminal crl2 is electrically connected to the rf chip 101 through the nor. The rf chip 101 further outputs a control signal to the first control terminal crl1 and the second control terminal crl2 according to the type of the signal, so as to control the single-pole double-throw switch 1032 to switch the signal receiving paths with different attenuation amounts.

In another embodiment of the present invention, the wireless communication device 10 may further include a control unit that controls the single-pole double-throw switch 1032 to switch the signal reception paths with different attenuation amounts. Specifically, the first control terminal crl1 is electrically connected to the control unit; the second control terminal crl2 is electrically connected to the control unit through the nor, and the control unit outputs control signals to the first control terminal crl1 and the second control terminal crl2 according to the type of the signal, so as to control the single-pole double-throw switch 1032 to switch signal receiving paths with different attenuation amounts.

It will be appreciated by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that suitable modifications and variations of the above embodiments are within the scope of the present invention as claimed in the appended claims, as long as they fall within the true spirit of the present invention.

Claims

1. A wireless communications apparatus, comprising:

an antenna for receiving and transmitting signals;

a coupler electrically connected to the antenna for coupling the signal;

2. The wireless communication apparatus of claim 1, wherein the common unit comprises:

3. The wireless communications apparatus of claim 2, wherein:

when the radio frequency chip identifies that the signal received by the antenna is an LTE signal, the single-pole double-throw switch is switched to the second output port, and the LTE signal is directly input to the radio frequency chip through the single-pole double-throw switch;

4. The wireless communications apparatus of claim 3, wherein the single pole, double throw switch further comprises:

the first control end is electrically connected with the radio frequency chip;

and the second control end is electrically connected with the radio frequency chip through a NOT gate, and the radio frequency chip outputs control signals to the first control end and the second control end according to the type of the signals so as to control the single-pole double-throw switch to switch signal receiving paths with different attenuation amounts.

5. The wireless communication device of claim 3, further comprising a control unit, wherein the single pole, double throw switch further comprises a first control terminal and a second control terminal;

the first control end is electrically connected to the control unit;

the second control end is electrically connected with the control unit through a not gate, and the control unit outputs control signals to the first control end and the second control end according to the type of the signals so as to control the single-pole double-throw switch to switch signal receiving paths with different attenuation amounts.

6. The wireless communication apparatus of claim 1, wherein the coupler is a directional coupler.

7. The wireless communication device of claim 1, wherein the attenuator is a PI-type attenuator.