KR100306010B1 - Transmisson power controller wireless mechanism and method - Google Patents

Abstract

According to the present invention, the radio transceiver transmits only the RF power corresponding to the strength of the radio wave corresponding to the received radio wave, thereby preventing the transmission at the maximum power than necessary, so that the battery can be used for a longer time. The present invention relates to a transmission power control apparatus and method.

The invention includes a receiver 100 comprising a band pass filter (1), an RF amplifier (2), a mixer (3), an IF unit (4), an IF amplifier unit (5), a transmission buffer (6), and a preamplifier. (7), a driving amplifier (8), a power amplifier (9), and a wireless device composed of a low pass filter (10), wherein a wireless device is provided between the receiver (100) and the transmitter (200). 11 is connected to an amplifier 12 which amplifies the input signal through a predetermined level, the output terminal of the amplifier 12 is changed to the voltage of the applied voltage and oscillated to the mixer 3 and the transmission buffer 6 The VCO 13, which is a voltage-controlled oscillator applying a frequency, the CPU 14 which exchanges signals with the VOC 13 and performs control, receives RSSI from the IF unit 4 under the control of the CPU 14. It further comprises an RSSI detection and RF power control unit 15 for detecting and controlling the power amplifier 9.

Description

Transmission power control device and method for a wireless device {TRANSMISSON POWER CONTROLLER WIRELESS MECHANISM AND METHOD}

The present invention relates to a FRS and other wireless communication devices using a battery, and in particular, according to the strength of the received radio wave of the radio transceiver to transmit the transmission RF power only by the intensity of the corresponding radio wave to transmit at a maximum power more than necessary The present invention relates to a transmission power control apparatus and method for a wireless device, which prevents the battery from being used for a longer time.

In general, radios communicate mainly under conditions of good transmission and reception.

If the transmission is performed even after reception is in good condition, i.e., close range, it is transmitted with the maximum RF power.

Therefore, the conventional wireless device emits the maximum power regardless of any condition, so there is a problem in that the power consumption is large and the use time of the battery is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and an object of the present invention is to transmit a transmit RF power only as much as the strength of the corresponding radio wave when transmitting according to the strength of the received radio wave of the radio transceiver. To provide a transmission power control apparatus and method of the present invention.

1 is a block diagram of the present invention

2 is an operational flowchart according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1: Band pass filter 2: RF amplifier

3: Mixer 4: IF section

5: IF amplifier 9: power amplifier

13: VCO15: RSSI detection and RF power control

100: receiver 200: transmitter

300: control unit

In order to achieve the above object, the present invention detects a RSSI (Received Siginal Strength Indicator) value in a received signal and controls a transmission power amplifier so that an appropriate power may be provided during transmission. It is characterized by the configuration.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of the present invention, which is largely comprised of a receiver 100, a transmitter 200, and a controller 300. As shown in FIG.

First, the receiver 100 includes a band pass filter 1 for filtering a received signal, an RF amplifier 2 for amplifying an RF signal to a predetermined level from an output signal of the band pass filter 1, and And a mixer 3 for mixing the input signals, an IF unit 4 for extracting and outputting an IF having an intermediate frequency from the signal through the mixer 3, and an output signal of the IF unit 4 at a predetermined level. It consists of an IF amplifier (5) for amplifying and outputting through a speaker.

The transmitting unit 200 includes a transmission buffer 6 for buffering an input signal, a preamplifier 7 for amplifying the output of the transmission buffer 6 to a predetermined level, and an output through the preamplifier 7. A driving amplifier 8 for amplifying the signal back to a predetermined level, a power amplifier 9 connected to an output terminal of the driving amplifier 8 for supplying power during transmission, and a constant output signal from the power amplifier 9; It consists of a low pass filter 10 for passing only the signal of the band and output to the antenna.

In addition, the control unit 300 is connected to the amplifier 12 for amplifying the input signal through the microphone 11 to a predetermined level, and is connected to the output terminal of the amplification unit 12 is changed as the transfer of the applied voltage to the mixer ( 3) and the VCO 13, which is a voltage controlled oscillator for applying an oscillation frequency to the transmission buffer 6, the CPU 14 which communicates with the VC0 13 and performs control, and the CPU 14 RSSI detection and RF power control unit 15 for detecting the RSSI from the IF unit 4 and controlling the power amplifier 9 under control.

Referring to the operation of the present invention configured as described above is as follows.

First, upon reception, a signal is input through the antenna ANT to the speaker through the band pass filter 1, the RF amplifier 2, the mixer 3, the IF unit 4, and the IF amplifier 5 in order. The reception sound is output.

At this time, as shown in Figure 2, the IF unit 4 detects the received signal level and transmits it to the CPU 14 through the RSSI detection and RF power control unit 15 (steps S1-S3).

In addition, the information detected by the RSSI detection and RF power control unit 15 is stored in the RAM (step S4).

On the other hand, if the user transmits a message through the microphone 11 at the time of transmission, it is amplified to a predetermined level through the amplifier 12, and then to the VCO 13, the CPU 14, and the RSSI detection and RF power control unit 15. The transmission signal is input.

In addition, an output signal through the VCO 13 is transmitted to the antenna through the transmission buffer 6, the preamplifier 7, the driving amplifier 8, the power amplifier 9 and the low pass filter 10. The RF terminal of the CPU 14 is controlled based on the information detected in the reception mode (step S5).

Since the RSSI detection and RF power control unit 15 controls the RF transmission bias, the power amplifier 9 transmits the transmission RF power according to the level of the detected information (steps S6 and S7).

When the transmission is made in this manner and the transmission is completed, the CPU 14 again determines the transmission / reception mode in the standby state (steps S8 and S9).

That is, the receiver 100 detects the strength of the received radio wave every time it is received and converts the level of the signal from the CPU 14 by A / D conversion and outputs it by D / A conversion again, or outputs an arbitrary CPU 14. As much as the output corresponding to the level of the received signal at the terminal.

The output power of the transmitter 200 changes the bias of the driving transistor or the final power transistor of the transmitter 200 to emit the corresponding amount of transmission power.

For example, when the degree of reception sensitivity is divided into four stages and applied, the following is shown in [Table 1], except that the RF power is 500 mW and the battery is AA size × 3.

As described above, the reception sensitivity can be divided into four stages, so that only the RF power of the receiver can be sufficiently received.

However, the step of the reception state is not limited to the four steps can be determined by determining the appropriate step, of course.

On the other hand, when comparing the battery usage time of the conventional and the present invention in the above [Table 1], conventionally, when the reception is 10mA, the transmission is 500mA, the standby is 15mA, the battery life time is 30.5 hours.

In contrast, in the present invention, when the reception is 100 mA, the transmission is 250 mA, and the standby time is 15 mA, the battery life time was 46.8 hours.

Therefore, it has been found that when the present invention is applied, the battery can be used for 16.3 hours more than the conventional method.

As described above, according to the present invention, the RSSI is detected from the received signal to control the transmission power, and according to the strength of the received radio wave of the radio transceiver, the transmission RF power is transmitted as much as the intensity of the corresponding radio wave when transmitting. It is effective to use the battery for a longer time by preventing transmission.

Claims (2)

A receiver 100 comprising a band pass filter 1, an RF amplifier 2, a mixer 3, an IF unit 4, an IF amplifier 5, a transmission buffer 6, a preamplifier 7. In a wireless device having a driving amplifier (8), a power amplifier (9), a low pass filter (10) and a transmitter (200), Between the receiver 100 and the transmitter 200, An amplifier 12 for amplifying the input signal through the microphone 11 to a predetermined level; A VCO 13 which is a voltage controlled oscillator oscillating according to the output signal of the amplifier 12 and applying a signal having an oscillation frequency to the mixer 3 and the transmission buffer 6; A CPU 14 for exchanging signals with the VCO 13 to control the operation of the VCO 13 and to control the operation of the wireless device; And Transmitting power of the wireless device, characterized in that it comprises an RSSI detection and RF power control unit 15 for controlling the power amplifier 9 by detecting the RSSI from the IF unit 4 under the control of the CPU 14. Control unit. A first step of determining whether the reception mode or the transmission mode is in the standby state; A second step of transmitting the signal level of the received signal to the CPU and storing the detected information in the RAM when the reception mode is in the first step; A third step of controlling the RF terminal of the CPU and controlling the RF transmission bias based on the information detected in the reception mode in the first mode; A fourth step of transmitting a transmit RF power in accordance with the level of information detected in the reception mode; And And a fifth step of returning to the standby state when the transmission is completed after performing the fourth step.