CN-224218393-U - Automatic antenna selection circuit based on TDD communication system and TDD communication equipment

CN224218393UCN 224218393 UCN224218393 UCN 224218393UCN-224218393-U

Abstract

The application provides an automatic antenna selection circuit and TDD communication equipment based on a TDD communication system, wherein the automatic antenna selection circuit comprises a radio frequency switch, a plurality of coupling detection circuits and a plurality of comparison circuits, a first port of the first coupling detection circuit is connected with a TDD signal source, a second port of the first coupling detection circuit is connected with an input end of the radio frequency switch, a third port of the second coupling detection circuit is connected with a first output end of the radio frequency switch, a second port of the second coupling detection circuit is connected with the first antenna, a third port of the third coupling detection circuit is connected with a second output end of the radio frequency switch, a second port of the third coupling detection circuit is connected with the second antenna, a third port of the third coupling detection circuit is connected with the second comparison circuit, the first comparison circuit outputs an enabling signal to an enabling end of the second comparison circuit according to a comparison result of a first detection signal and a reference signal, and the second comparison circuit outputs a control signal to the radio frequency switch according to a comparison result of the second detection signal and the third detection signal.

Inventors

LI XIN
DING JIE
TIAN TING
FANG WENQI
GAO HUAI

Assignees

苏州华士无线科技有限公司

Dates

Publication Date: 20260508
Application Date: 20250422

Claims (8)

1. An automatic antenna selection circuit based on a TDD communication system is characterized by comprising a radio frequency switch, a plurality of coupling detection circuits and a plurality of comparison circuits, wherein the plurality of coupling detection circuits at least comprise a first coupling detection circuit, a second coupling detection circuit and a third coupling detection circuit, and the plurality of comparison circuits at least comprise a first comparison circuit and a second comparison circuit; The first port of the first coupling detection circuit is connected with a TDD signal source, the second port of the first coupling detection circuit is connected with the input end of the radio frequency switch, and the third port of the first coupling detection circuit is connected with the first input end of the first comparison circuit; The first port of the second coupling detection circuit is connected with the first output end of the radio frequency switch, the second port of the second coupling detection circuit is connected with the first antenna, and the third port of the second coupling detection circuit is connected with the first input end of the second comparison circuit; The first port of the third coupling detection circuit is connected with the second output end of the radio frequency switch, the second port of the third coupling detection circuit is connected with the second antenna, and the third port of the third coupling detection circuit is connected with the second input end of the second comparison circuit; The first input end of the first comparison circuit receives a first detection signal output by the first coupling detection circuit, the second input end of the first comparison circuit receives a reference signal, and the first comparison circuit outputs an enabling signal to the enabling end of the second comparison circuit according to the comparison result of the first detection signal and the reference signal so as to control the working state of the second comparison circuit; The first input end of the second comparison circuit receives the second detection signal output by the second coupling detection circuit, the second input end of the second comparison circuit receives the third detection signal output by the third coupling detection circuit, and the second comparison circuit outputs a control signal to the radio frequency switch according to the comparison result of the second detection signal and the third detection signal so as to control the switching of the radio frequency switch.
2. The automatic antenna selection circuit of claim 1, wherein the radio frequency switch comprises a single pole, multiple throw switch having a stationary end connected to the second port of the first coupling detector circuit and a first movable end connected to the first port of the second coupling detector circuit and a second movable end connected to the first port of the third coupling detector circuit.
3. The automatic antenna selection circuit of claim 1, wherein the coupled detection circuit comprises a microstrip line coupler, a detector, and a low pass filter; The microstrip line coupler is used for extracting the energy of the received signal and outputting a coupling signal to the detector, and the detector is used for converting the coupling signal into a direct-current level signal, filtering the direct-current level signal by the low-pass filter and outputting the direct-current level signal.
4. An automatic antenna selection circuit according to claim 3, wherein said detector comprises a diode detector or a logarithmic detector.
5. The automatic antenna selection circuit of claim 1, wherein the comparison circuit comprises a high-speed voltage comparator.
6. The automatic antenna selection circuit of claim 1, wherein the first coupling detection circuit is configured to detect a state of the TDD source; When the TDD information source is in a transmitting state, a first detection signal output by the first coupling detection circuit is higher than the reference signal, the first comparison circuit outputs a high-level enabling signal, and the second comparison circuit does not work; When the TDD signal source is in a receiving state, the first detection signal output by the first coupling detection circuit is lower than the reference signal, the first comparison circuit outputs a low-level enabling signal, and the second comparison circuit works.
7. The automatic antenna selection circuit of claim 1, wherein the second coupling detection circuit is configured to extract a signal strength of the first antenna and output a second detection signal, and the third coupling detection circuit is configured to extract a signal strength of the second antenna and output a third detection signal; And when the second comparison circuit works, a control signal is output to the radio frequency switch according to the comparison result of the second detection signal and the third detection signal, and the control signal is used for controlling the radio frequency switch to be switched to an antenna with stronger signal so as to enable the TDD information source to communicate through the antenna with stronger signal.
8. A TDD communications device comprising an automatic antenna selection circuit based on a TDD communications system according to any one of claims 1 to 7.

Description

Automatic antenna selection circuit based on TDD communication system and TDD communication equipment Technical Field The present application relates to the field of wireless communications technologies, and in particular, to an automatic antenna selection circuit based on a TDD communications system and a TDD communications device. Background In a wireless communication system, the performance of an antenna directly affects the reception quality of a signal. The conventional wireless communication device generally adopts a fixed antenna or a manual antenna switching mode, and cannot dynamically select an optimal antenna according to signal strength in real time, so that communication quality is unstable, and particularly in an environment with serious multipath effect and signal interference, the fixed antenna or the manual antenna switching mode is difficult to meet the requirement of high-quality communication. In order to solve the above-mentioned problems, some automatic antenna selection schemes are proposed in the prior art, but these schemes are generally high in complexity and cost, and have problems of switching delay, miscwitch and the like in practical application. Therefore, there is a need for an automatic antenna selection circuit that is simple in structure, low in cost, fast, efficient, and stable in performance. Disclosure of utility model In view of this, the present application provides an automatic antenna selection circuit based on a TDD communication system and a TDD communication device, which aim to realize low-cost, real-time and stable automatic antenna selection through a hardware circuit, thereby improving communication quality. In a first aspect, the present application provides an automatic antenna selection circuit based on a TDD communication system, including a radio frequency switch, a plurality of coupling detection circuits, and a plurality of comparison circuits, where the plurality of coupling detection circuits includes at least a first coupling detection circuit, a second coupling detection circuit, and a third coupling detection circuit, and the plurality of comparison circuits includes at least a first comparison circuit and a second comparison circuit; The first port of the first coupling detection circuit is connected with a TDD signal source, the second port of the first coupling detection circuit is connected with the input end of the radio frequency switch, and the third port of the first coupling detection circuit is connected with the first input end of the first comparison circuit; The first port of the second coupling detection circuit is connected with the first output end of the radio frequency switch, the second port of the second coupling detection circuit is connected with the first antenna, and the third port of the second coupling detection circuit is connected with the first input end of the second comparison circuit; The first port of the third coupling detection circuit is connected with the second output end of the radio frequency switch, the second port of the third coupling detection circuit is connected with the second antenna, and the third port of the third coupling detection circuit is connected with the second input end of the second comparison circuit; The first input end of the first comparison circuit receives a first detection signal output by the first coupling detection circuit, the second input end of the first comparison circuit receives a reference signal, and the first comparison circuit outputs an enabling signal to the enabling end of the second comparison circuit according to the comparison result of the first detection signal and the reference signal so as to control the working state of the second comparison circuit; The first input end of the second comparison circuit receives the second detection signal output by the second coupling detection circuit, the second input end of the second comparison circuit receives the third detection signal output by the third coupling detection circuit, and the second comparison circuit outputs a control signal to the radio frequency switch according to the comparison result of the second detection signal and the third detection signal so as to control the switching of the radio frequency switch. By designing the automatic antenna selection circuit comprising the radio frequency switch, the plurality of coupling detection circuits and the plurality of comparison circuits, the application detects the signal of the TDD (Time Division Duplexing, time division duplex) information source through the first coupling detection circuit to acquire the state of the TDD information source, compares the detected signal with the reference signal through the first comparison circuit to output the enabling signal of the second comparison circuit, then respectively detects the signal energy of the first antenna and the second antenna through the second coupling detection circuit and the third coupling det