[0011] See figure 1 A preferred embodiment of the present invention provides a wireless communication device 100, which can be an electronic device with WIFI communication function, such as a mobile phone, a personal digital assistant (PDA), and a tablet computer.
[0012] The wireless communication device 100 includes a WIFI antenna 10, a duplexer 20, a power amplifier 30, a WIFI transceiver chip 40 and a central processing unit 50.
[0013] The WIFI antenna 10 is used to receive WIFI signals from a wireless router or other similar devices, and send the WIFI signals to the wireless router or other similar devices.
[0014] The duplexer 20 is used to isolate the signal transmission path and signal reception path of the WIFI signal, and is electrically connected between the WIFI antenna 10 and the WIFI transceiver chip 30, and is used to transmit the WIFI signal received by the WIFI antenna 10 to the WIFI Transceiver chip 30. At the same time, the duplexer 20 is also electrically connected between the WIFI antenna 10 and the power amplifier 40 for transmitting the WIFI signal amplified by the power amplifier 40 to the WIFI antenna 10.
[0015] The power amplifier 30 is electrically connected between the duplexer 20 and the WIFI transceiver chip 40 for amplifying the WIFI signal transmitted by the WIFI transceiver chip 40. In this embodiment, the gain of the power amplifier 30 is about 20 dB.
[0016] The WIFI transceiver chip 40 is electrically connected to the central processing unit 50. The WIFI transceiver chip 40 is used to detect the received signal strength (RSSI) of the current WIFI signal according to the WIFI signal transmitted by the duplexer 20, and connect The received signal strength of the WIFI signal is transmitted to the central processing unit 50.
[0017] The WIFI transceiver chip 40 is also used to modulate/demodulate the WIFI signal, that is, to demodulate the WIFI signal transmitted by the duplexer 20 and to modulate the WIFI signal to be transmitted to the power amplifier 30.
[0018] The central processing unit 50 is configured to control the output power of the WIFI transceiver chip 40 according to the received signal strength of the WIFI signal transmitted by the WIFI transceiver chip 40, and further control the gain of the power amplifier 30 through the WIFI transceiver chip 40. Specifically, the central processing unit 50 presets a received signal strength reference interval, and when the received signal strength of the WIFI signal received by the central processing unit 50 exceeds the upper limit of the received signal strength reference interval, the central processing unit 50 sends the WIFI transceiver chip 40 outputs the first control signal; when the received signal strength of the WIFI signal received by the central processing unit 50 is within the received signal strength reference interval or is lower than the lower limit of the received signal strength reference interval, the central processing unit 50 sends the WIFI transceiver chip 40 outputs the second control signal.
[0019] In addition, the WIFI transceiver chip 40 is also used to output the first output power (such as 0 dBm) when receiving the first control signal output by the central processing unit 50, and send a gain disable signal to the power amplifier 30 to control The gain of the power amplifier 30 is turned off (that is, the gain of the power amplifier 30 is 0 dB at this time). The WIFI transceiver chip 40 is also used to output a second output power (such as -2 dBm) when receiving a second control signal output by the central processing unit 50, and send a gain enable signal to the power amplifier 30 to control the power amplifier 30 Turn on the gain (that is, the gain of the power amplifier 30 at this time is 20 dB).
[0020] The method of using the wireless communication device 100 will be described in two cases below.
[0021] First, when the wireless communication device 100 is in a strong field environment, for example, when the wireless communication device 100 is close to a wireless router, the received signal strength of its WIFI signal is relatively high (for example, higher than the upper limit of the received signal strength reference interval). At this time, the WIFI transceiver chip 40 transmits the received signal strength of the detected WIFI signal to the central processing unit 50. The central processing unit 50 outputs the first control signal to control the WIFI transceiver chip 40 to output the first output power (such as 0 dBm), and sends the gain disable signal to the power amplifier 30 through the WIFI transceiver chip 40 to control the power amplifier 30 to turn off Gain (for example, the gain of the power amplifier 30 is 0 dB at this time). At this time, the WIFI signal modulated by the WIFI transceiver chip 40 is transmitted by the WIFI antenna 10 after passing through the power amplifier 30 and the duplexer 20. In this way, in this embodiment, the total transmission power of the WIFI antenna 10 is 0 dBm (the sum of the first output power and the gain of the power amplifier 30).
[0022] First, when the wireless communication device 100 is in a weak field environment, for example, when the wireless communication device 100 is far away from the wireless router, the received signal strength of its WIFI signal is low (for example, it is located within the received signal strength reference interval). At this time, the WIFI transceiver chip 40 transmits the received signal strength of the detected WIFI signal to the central processing unit 50. The central processing unit 50 outputs the second control signal to control the WIFI transceiver chip 40 to output the second output power (for example, -2dBm), and sends a gain enable signal to the power amplifier 30 through the WIFI transceiver chip 40 to control the power amplifier 30 to turn on the gain (For example, the gain of the power amplifier 30 is 20 dB at this time). At this time, the WIFI signal modulated by the WIFI transceiver chip 40 is transmitted by the WIFI antenna 10 after passing through the power amplifier 30 and the duplexer 20. Thus, in this embodiment, the total transmission power of the WIFI antenna 10 is 18 dBm (the sum of the first output power and the gain of the power amplifier 30).
[0023] It can be seen from the above two situations that when the received signal strength of the WIFI signal is high, the total transmission power of the WIFI antenna 10 is lower, so that a lower total transmission power can be used in a better signal transmission and reception environment; When the received signal strength is low, the total transmission power of the WIFI antenna 10 is higher, so that a higher total transmission power can be used in a poor signal transmission and reception environment.
[0024] The WIFI transceiver chip 40 of the wireless communication device 100 of the present invention detects the current received signal strength, the central processing unit 50 controls the output power of the WIFI transceiver chip 40 according to the received signal strength, and further controls the power amplifier 30 through the WIFI transceiver chip 40 Gain. In this way, the wireless communication device 100 can adjust the total transmission power in different signal transceiving environments, which can avoid the phenomenon that the wireless communication device 100 generates heat and the battery power drops sharply due to long-term use.
