KR100701621B1 - Mobile phone for controlling diversity - Google Patents

Abstract

The present invention provides a mobile communication terminal capable of selectively performing transmission and reception diversity when transmitting and receiving radio frequency, comprising: control means for controlling transmission and reception of radio frequency signals and controlling transmission and reception diversity; Reception adjusting means for controlling reception of radio frequency signals and controlling reception diversity according to the control of the control means; First radio frequency receiving means for converting a radio frequency signal received through the first antenna into a baseband signal according to the reception control of the reception adjusting means and transmitting the result to a control means; Second radio frequency receiving means for converting a radio frequency signal received through the second antenna into a baseband signal according to the reception diversity control of the reception adjusting means and transmitting the result to the control means; Transmission diversity adjusting means for controlling transmission diversity under control of the control means; And converts the baseband signal transmitted from the control means into a radio frequency signal and transmits it through the first antenna, and transmits the radio frequency signal changed according to the transmit diversity control of the transmit diversity adjusting means through the second antenna. Frequency transmission means.

Mobile communication, terminal, diversity, control, transmission and reception

Description

Mobile communication terminal for controlling diversity

1 is a block diagram of a conventional mobile communication terminal.

2 is a block diagram of a mobile communication terminal for controlling diversity according to an embodiment of the present invention;

3 is a circuit diagram of a mobile communication terminal for controlling diversity according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

201: first antenna 202: second antenna

203: first duplexer 204: second duplexer

210: keypad 220: memory

230: microphone 240: speaker

250: LCD screen 260: control unit

270: first radio frequency receiver 280: second radio frequency receiver

290: radio frequency transmitter

The present invention relates to a mobile communication terminal in a wireless communication system, and more particularly, to a mobile communication terminal capable of selectively performing transmission and reception diversity when transmitting and receiving radio frequency.

In the strong electric field with good communication environment, the communication between the mobile communication terminal and the base station works well, but in the weak electric field with poor communication environment, the signal strength is weak, so communication is not performed well and transmission / receiving power is increased. And signal-to-noise ratio increased. In order to improve this problem, a diversity technique for receiving radio frequency signals through various propagation paths has been proposed, and a configuration of a conventional mobile communication terminal to which the technique is applied is shown in FIG. 1.

Referring to FIG. 1, a conventional mobile communication terminal includes an antenna 110 for transmitting and receiving radio frequencies, a duplexer 120 electrically connected to the antenna 110 to transmit and receive radio frequency signals, and a duplexer 120. Low noise amplifier 131 for amplifying the intensity of the radio frequency signal received through the), a filter 132 for removing noise by filtering the radio frequency signal amplified by the low noise amplifier 131, and a filter 132 And a first received signal processor 133 for converting the RF signal filtered through the demodulated and baseband signal and outputting the demodulated and baseband signal to the controller 140, and modulating the baseband signal transmitted from the controller 140. A transmission signal processing unit 151 for changing and outputting a signal, a filter 152 for filtering out radio frequency signals output from the transmission signal processing unit 151, and removing noise from the transmission signal processing unit 151; A power amplifier 153 for amplifying the power of the frequency signal, and a radio frequency signal amplified by the power amplifier 153 by blocking transmission of the received signal received through the antenna 110 to the transmission signal processor 151. It is provided with a transceiver (154) for transmitting to the duplexer (120).

In addition, the conventional mobile communication terminal, the antenna 160 for receiving the radio frequency, and the band pass filter 171 for passing only the frequency signal of the reception band by filtering the radio frequency signal received through the antenna 160 And a low noise amplifier 172 for amplifying the strength of the RF signal filtered through the band pass filter 171, and a filter for filtering out the RF signal amplified through the low noise amplifier 172 to remove noise. 173 and a second received signal processor 174 for converting the RF signal filtered through the filter 173 into a demodulation and baseband signal and outputting the demodulated signal to the controller 140.

Since the conventional mobile communication terminal performs only the reception diversity and does not perform the transmission diversity as described above, when the radio wave is transmitted in a poor communication environment, the base station cannot correctly receive the signal transmitted from the mobile communication terminal. As a result, there is a problem in that the quality of the communication service provided to the receiver is lowered. In particular, since the conventional mobile communication terminal cannot adjust the reception diversity according to the surrounding communication environment, the power of the battery is unnecessarily wasted by performing the reception diversity even in a strong electric field.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a mobile communication terminal capable of selectively performing transmit and receive diversity when transmitting and receiving radio frequency.

Another object of the present invention is to provide a mobile communication terminal capable of preventing transmission quality deterioration due to fading due to buildings or features located on the propagation path by arbitrarily adjusting transmit / receive diversity according to a surrounding communication environment. to provide.

Still another object of the present invention is to provide a mobile communication terminal capable of preventing unnecessary power consumption of a battery due to diversity in a strong electric field by adjusting the communication environment to perform transmit / receive diversity only in a poor area.

In order to achieve the above object, the present invention provides a mobile communication terminal that receives power from a battery in a wireless communication system and transmits and receives radio frequency signals through first and second antennas. Control means for controlling the city; Reception adjusting means for controlling reception of a radio frequency signal and controlling reception diversity according to the control of the control means; First radio frequency receiving means for converting a radio frequency signal received through the first antenna into a baseband signal and transmitting the baseband signal to the control means according to the reception control of the reception adjusting means; Second radio frequency receiving means for converting a radio frequency signal received through the second antenna into a baseband signal according to the reception diversity control of the reception adjusting means and transmitting the baseband signal to the control means; Transmission diversity adjusting means for controlling transmission diversity according to the control of the control means; And converting the baseband signal transmitted from the control means into a radio frequency signal and transmitting the radio frequency signal through the first antenna, and transmitting the changed radio frequency signal according to the transmit diversity control of the transmit diversity adjusting means. It includes a radio frequency transmission means for transmitting through.

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

2 is a block diagram of a mobile communication terminal for controlling diversity according to an embodiment of the present invention.

Referring to FIG. 2, the mobile communication terminal of the present invention includes a keypad 210 for inputting user commands and texts related to a call service and various additional services, and a memory 220 for storing text and video information. A microphone 230 for inputting a user's voice signal and various sound signals, a speaker 240 for outputting a sound signal, a liquid crystal display (LCD) 250 for displaying text and images, a keypad According to the user's instructions input through the 210, the control of the transmission of the sound signal input through the microphone 230, the reading and writing of text and image information to the memory 220, the speaker 240 The controller 260 is configured to control the output of a sound signal, to control the display of text and images on the LCD screen 250, and to control the transmission and reception of radio frequency signals.

In addition, the mobile communication terminal of the present invention receives the high frequency signals received through the first and second antennas 201 and 202 and the first antenna 201 under the control of the controller 260 for transmitting and receiving radio frequency. Converts a high frequency signal received through the second antenna 202 into a baseband signal under the control of the first radio frequency receiver 270 and the control unit 260 and converts it into a baseband signal. A second radio frequency receiver 280 to be transmitted to the control unit 260, and under the control of the control unit 260 converts the baseband signal transmitted from the control unit 260 into a high frequency signal to selectively distribute and distribute the high frequency signal A radio frequency transmitter 290 outputs toward the first and second antennas 201 and 202, and a high frequency signal received through the first antenna 201 to the first radio frequency receiver 270, and a radio frequency transmitter The high frequency signal output from The first duplexer 203 for transmitting through the first antenna 201 and the high frequency signal received through the second antenna 202 are transmitted to the second radio frequency receiver 280 and output from the radio frequency transmitter 290. And a second duplexer 204 for transmitting the high frequency signal through the second antenna 202.

Looking at the circuit configuration for the transmission and reception of the mobile communication terminal of the present invention having such a configuration as shown in FIG.

Referring to FIG. 3, the first RF receiver 270 includes a low noise amplifier 271 having an input terminal connected to the first duplexer 203, a filter 272 having an input terminal connected to an output terminal of the low noise amplifier 271, and An amplifier 273 having an input connected to the output of the filter 272, a local oscillator 205 for oscillating microwave frequencies, and two inputs connected to an output of the amplifier 273 and an output of the local oscillator 205, respectively. A mixer 274, a low pass filter 275 whose input is connected to the output of the mixer 274, and an amplifier whose input is connected to the low pass filter 275 and whose output is connected to the receiving end RX1 of the controller 260. 276, an input terminal is connected to the reception control terminal RX_ON of the controller 260, a power terminal is connected to a power supply VCC of a battery (not shown), and an output terminal is connected to each of the power supplies of the amplifiers 271, 273, and 276. And a first reception regulator 277 connected to the stage.

Here, the first reception controller 277 receives the power supply VCC of the battery to control the driving of the amplifiers 271, 273, and 276. That is, the controller 260 receives the reception through the reception control terminal RX_ON. When outputting a control signal indicating a, the first receiving controller 277 applies the power supply (VCC) supplied from the battery to the power supply terminals of the amplifiers 271, 273, 276 to output the amplifiers 271, 273, 276 Drive (ON). When driven in this way, the amplifier 271 amplifies the radio frequency signal received through the first duplexer 203 to pass to the filter 272, and the amplifier 273 amplifies the output signal of the filter 272 to the mixer In operation 274, the amplifier 276 also amplifies the output signal of the low pass filter 275 and outputs the amplified signal to the receiver RX1 of the controller 260.

In this case, the first reception controller 277 receives 4.2V of the battery power supply (VCC) and outputs a voltage of about 2.9V to the driving power of the amplifiers 271, 273, and 276.

If the controller 260 outputs a control signal for instructing stop of reception through the reception control terminal RX_ON, the first reception controller 277 supplies a voltage of 0V to the power supply terminals of the amplifiers 271, 273, and 276. Output to turn off the amplifiers 271, 273, 276. In this case, since the amplifier 271 does not transmit the radio frequency signal received through the first duplexer 203 to the filter 272, the controller 260 receives the signal through the first antenna 201. Received radio frequency signal is not received.

The second RF receiver 280 includes a low noise amplifier 281 having an input terminal connected to the second duplexer 204, a filter 282 having an input terminal connected to an output terminal of the low noise amplifier 281, and an input terminal having a filter 282. An amplifier 283 connected to the output of the amplifier, a local oscillator 205 for oscillating the microwave frequency, a mixer 284 connected to the output of the amplifier 283 and an output of the local oscillator 205, respectively; A low pass filter 285 having an input connected to the output of the mixer 284, an amplifier 286 having an input connected to the low pass filter 285 and an output connected to the receiving end RX2 of the controller 260, and an input connected to the low pass filter 285. A second reception connected to the transmit diversity control terminal RX_DIV of the control unit 260, a power supply terminal connected to a power supply VCC of the battery, and an output terminal connected to each power supply terminal of the amplifiers 281, 283, and 286. And a regulator 287.

The low noise amplifiers 271 and 281 amplify and output the radio frequency signals received through the first and second duplexers 203 and 204, respectively. The low noise amplifiers 271 and 281 improve the signal-to-noise ratio (SNR). give.

The filters 272 and 282 remove the noise of the signal generated during the amplification of the low noise amplifiers 271 and 281, respectively.

The amplifiers 273 and 283 amplify the radio frequency signals passing through the filters 272 and 282, respectively, to compensate for the weakening of the radio frequency signals in the course of passing through the filters 272 and 282.

The mixers 274 and 284 generate baseband signals by mixing the radio frequency signals amplified by the amplifiers 273 and 283 and the microwave frequencies oscillated from the local oscillator 205, respectively. It converts the signal into a baseband signal suitable for the control unit 260.

The low pass filters 275 and 285 pass only the baseband signal among the output signals of the mixers 274 and 284, respectively. This is to remove any frequency band signal other than the baseband signal among the output signals of the mixers 274 and 284.

The amplifiers 276 and 286 amplify and transmit the baseband signal filtered by the low pass filters 275 and 285 to the control unit 260, which has sufficient strength to be accurately recognized by the control unit 260. The baseband signal is provided to the controller 260.

The second reception controller 287 receives the power supply VCC of the battery and controls the driving of the amplifiers 281, 283, and 286. That is, the controller 260 receives the reception through the reception diversity control terminal RX_DIV. When outputting a control signal indicating diversity, the second reception controller 287 applies a power supply VCC supplied from the battery to a power supply terminal of the amplifiers 281, 283, and 286, thereby supplying the amplifiers 281, 283, and 286. Drives (ON). When driven in this way, the amplifier 281 amplifies the radio frequency signal received through the second duplexer 204 to pass to the filter 282, and the amplifier 283 amplifies the output signal of the filter 282 to the mixer The amplifier 286 also amplifies the output signal of the low pass filter 285 and outputs the received signal to the receiver RX2 of the controller 260. Here, the second receiving controller 287 receives 4.2V of the power supply VCC of the battery and outputs a voltage of about 2.9V to the driving power of the amplifiers 281, 283, and 286.

If the control unit 260 outputs a control signal for instructing to stop reception diversity through the reception diversity control terminal RX_DIV, the second reception controller 287 is connected to a power supply terminal of the amplifiers 281, 283, and 286. A voltage of 0 V is output to turn off the amplifiers 281, 283, and 286. When this is off, since the amplifier 281 does not transmit the radio frequency signal received through the second duplexer 204 to the filter 282, the controller 260 receives the radio frequency received through the second antenna 202. No signal is received.

The radio frequency transmitter 290 includes a local oscillator 205 for oscillating microwave frequencies, a mixer 291 having two input terminals connected to an output terminal of the transmission terminal TX and the local oscillator 205 of the control unit 260, respectively. An amplifier 292 having an input connected to the output of the mixer 291, a filter 293 having an input connected to the output of the amplifier 292, a power divider 294 having an input connected to the output of the filter 293, A first power amplifier 295 having an input terminal connected to one output terminal among the output terminals of the power divider 294 and a power terminal connected to the transmission control terminal PA_ON of the control unit 260, and an input terminal of the power amplifier 295. A first transmit / receive separator 296 connected to the output terminal and the output terminal connected to the first duplexer 203, a second power amplifier 297 connected to the other output terminal among the output terminals of the power divider 294, and an input terminal. Is connected to the output of the second power amplifier 297 The ryeokdan is provided with a second transmission and reception separator 298 is connected to the second duplexer (204).

The RF transmitter 290 further includes a transmit diversity controller 299 for controlling transmit diversity under the control of the controller 260.

The mixer 291 is to generate a high frequency signal by mixing the baseband signal output from the controller 260 and the microwave frequency oscillated from the local oscillator 205, and transmits a signal to be transmitted by the controller 260 to the outside. It converts into a signal of an airwave band suitable for the following.

The amplifier 292 amplifies the radio frequency signal converted by the mixer 291.

The filter 293 removes noise generated in the process of being amplified by the amplifier 292.

The power divider 294 distributes the radio frequency signals passing through the filter 293 to transmit diversity and outputs them to the first and second power amplifiers 295 and 297.

The first and second power amplifiers 295 and 297 amplify the strength of the weakened signal through the filter 293 and the power divider 294, respectively, and have a power suitable for transmission to the outside via airwaves. Amplify the signal. The driving of the first power amplifier 295 is controlled by a transmission control signal output from the transmission control terminal PA_ON of the controller 260.

The first and second transceivers 296 and 298 transmit radio frequency signals amplified by the first and second power amplifiers 295 and 297 to the first and second duplexers 203 and 204, respectively. The radio frequency signals received through the first and second duplexers 203 and 204 are blocked from being received by the radio frequency transmitter 290.

The transmit diversity controller 299 has two input terminals connected to the transmit control stage PA_ON and the transmit diversity control stage TX_DIV of the control unit 260, respectively, and the output stage of the transmit diversity controller 299 is connected to the power stage of the second power amplifier 297. It consists of an AND gate 299-1.

That is, the logical product gate 299-1 outputs the high signal “1” to the power supply terminal of the second power amplifier 297 only when the high signal “1” is input to each of the two input terminals. When the low signal "0" is input to one of the input terminals, that is, when the high signal "1" is input to one input terminal and the low signal "0" is input to the other input terminal, the low signal "0" is input to the second input terminal. It outputs to the power supply terminal of the power amplifier 297. Accordingly, the operation of the second power amplifier 297 is controlled by the output signal of the transmit diversity controller 299. For example, when the high signal “1” is output from the AND gate 299-1, the second power amplifier 297 is driven (ON) to transmit the high frequency signal distributed by the power divider 924 to the second transceiver 298. If the low signal " 0 " is output from the AND gate 299-1, the second power amplifier 297 is turned OFF to generate a high frequency signal distributed by the power divider 924. It blocks the transmission in the direction of the second antenna 202.

Meanwhile, in the above-described present invention, the first and second radio frequency receivers 270 and 280 start to convert the received radio frequency signal directly into a baseband signal without undergoing an intermediate frequency conversion process, and also the radio frequency transmitter 290 ) Similarly disclosed to immediately convert the baseband signal output from the control unit 260 into a radio frequency signal without undergoing the intermediate frequency conversion process, which is described as an embodiment according to the recent technology trends, but is not limited thereto. no.

That is, the present invention may start the first and second radio frequency receivers 270 and 280 convert the received radio frequency signals into intermediate frequency signals and then convert the intermediate frequency signals into baseband signals. The frequency transmitter 290 may also start to convert the baseband signal output from the controller 260 into an intermediate frequency signal and then convert the baseband signal into a high frequency signal. Since the frequency conversion scheme is a commonly used technique, a detailed description thereof will be omitted.

Referring to the operation of the mobile communication terminal of the present invention having the configuration as described above in detail as follows.

First, since the controller 260 always outputs a control signal instructing reception through the reception control terminal RX_ON to the first reception controller 277 in a communication state without receiving a user's instruction, the first reception controller 277. As described above, the power supply (VCC) supplied from the battery is applied to drive the amplifiers 271, 273, and 276. When the amplifiers 271, 273, and 276 are driven as described above, the radio frequency signal received through the first antenna 201 is transmitted to the controller 260 through the first radio frequency receiver 270. Through the above-described process, the baseband signal is converted and input to the receiving end RX1 of the controller 260.

When the user inputs a command for instructing reception diversity using a key on the keypad 210, the controller 260 sets a reception diversity mode and instructs reception diversity through the reception diversity control terminal RX_DIV. Outputs a control signal to the second reception controller 287. In this case, as described above, the second reception controller 287 drives the amplifiers 281, 283, and 286 by applying power VCC supplied from the battery. When the amplifiers 281, 283, and 286 are driven as described above, reception diversity is performed through the second RF receiver 280. In such a reception diversity state, the radio frequency signal received through the second antenna 204 is converted into a baseband signal by the second radio frequency receiver 280 as described above to receive the receiver RX2 of the controller 260. Is entered.

In this case, the controller 260 may select and use a good signal among the signals received through the two propagation paths or use all of the received signals. The signal processing method may be determined according to an execution program set in advance at the time of manufacture. have.

If the received signal is a text and / or video signal, the controller 260 displays the received text and / or video on the LCD screen 250 or memory according to a user's instruction input through the keypad 210. Save to 220. If the received signal is a voice signal, the controller 260 outputs the received voice signal to the outside through the speaker 240.

In addition, when the controller 260 is to transmit a text input through the keypad 210 or a voice signal input through the microphone 230 according to the user's instructions, the controller 260 is based on the text signal or the voice signal The band signal is converted into a band signal and transmitted to the radio frequency transmitter 290.

Here, the radio frequency transmitter 290 converts the baseband signal into a high frequency signal through the mixer 291, and the converted high frequency signal is distributed through the power divider 294 so that the first and second power amplifiers 295 may be used. Is delivered to. At this time, when the second power amplifier 297 is in the OFF state, the baseband signal output from the power divider 294 is amplified by the first power amplifier 295 and transmitted in the direction of the first antenna 201. do.

Even when transmission diversity is cut off in this way, the control unit 260 receives the control signal, i.e., the high signal "1", which instructs transmission through the transmission control terminal PA_ON in the communication state without first receiving the user's instruction. Since the output to the power supply terminal of the amplifier 295 to maintain the driving (ON) state of the first power amplifier 295, the high frequency signal converted by the mixer 291 is transmitted to the outside through the first antenna 201 It can be.

If the user inputs a command for instructing transmit diversity using a key on the keypad 210, the controller 260 sets a transmit diversity mode and instructs transmit diversity through the transmit diversity control terminal TX_DIV. Outputs a control signal, i.e., a high signal "1", to the transmit diversity controller 299, and always transmits a high signal "1" to the transmit diversity controller 299 through the transmit control terminal PA_ON as described above. Output Accordingly, the transmit diversity controller 299 drives the second power amplifier 297 through the above-described process.

As described above, when the second power amplifier 297 is driven (ON), the high frequency signals distributed by the power divider 294 are simultaneously transmitted through the first and second antennas 201 and 202.

However, if the user inputs a stop command of transmit diversity or instructs transmit diversity using a key, the controller 260 transmits a low signal "0" through the transmit diversity control terminal TX_DIV. 299, the transmit diversity regulator 299 turns off or maintains the second power amplifier 297 as described above.

As described above, the present invention enables the user to arbitrarily transmit / receive diversity using a key, so that the mobile communication terminal can achieve diversity only in a weak electric field in which electromagnetic wave transmission is disturbed by surrounding buildings or features. By not performing diversity in a strong electric field state in which the communication state is good, it is possible to prevent unnecessary power consumption of the battery and provide a high quality communication service.

Although the technical spirit of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

As described above, the present invention provides a high quality communication service to both the sender and the receiver by arbitrarily adjusting the transmit / receive diversity according to the surrounding communication environment, thereby increasing the reliability of the user for the mobile communication service. have.

Claims (6)

A mobile communication terminal receiving power from a battery in a wireless communication system and transmitting and receiving radio frequency signals through first and second antennas, Control means for controlling transmission and reception of radio frequency signals and controlling transmission and reception diversity; Reception adjusting means for controlling reception of a radio frequency signal and controlling reception diversity according to the control of the control means; First radio frequency receiving means for converting a radio frequency signal received through the first antenna into a baseband signal and transmitting the baseband signal to the control means according to the reception control of the reception adjusting means; Second radio frequency reception means for converting a radio frequency signal received through the second antenna into a baseband signal according to reception diversity control according to a user command of the reception adjustment means and transmitting the baseband signal to the control means; Transmission diversity adjusting means for controlling transmission diversity according to the control of the control means; And The baseband signal transmitted from the control means is converted into a radio frequency signal and transmitted through the first antenna, and the changed radio frequency signal is converted into the second antenna according to the transmit diversity control of the transmit diversity adjusting means. Radio frequency transmission means for transmitting through Including, The radio frequency transmitting means, A mixer for converting the baseband signal transmitted from the control means into a radio frequency signal; A power divider for distributing the radio frequency signal converted by the mixer; A first power amplifier driven by the control of the control means to amplify the radio frequency signal distributed through the power divider and output the amplified RF signal toward the first antenna; And A second power amplifier driven by a driving power delivered from the transmission diversity adjusting means to amplify the radio frequency signal distributed through the power divider and output the amplified RF signal toward the second antenna; A mobile communication terminal further comprising. The method of claim 1, The reception control means, A first reception controller which receives power supplied from the battery and supplies driving power to the first radio frequency receiver according to the control of the control means; And A second reception controller which receives power supplied from the battery and supplies driving power to the second radio frequency receiver according to the control of the control means; Mobile communication terminal comprising a. The method of claim 2, And a control command for instructing reception diversity from the outside, wherein the control means controls the second reception controller to perform reception diversity through the second radio frequency reception means. delete The method of claim 1, The transmit diversity adjusting means, And two input terminals are logical AND gates respectively connected to a transmission control terminal and a transmission diversity control terminal of the control means, and one output terminal is connected to a power supply terminal of the second power amplifier. The method of claim 5, When a control command for instructing transmit diversity is input from the outside, the control means outputs a high signal through the transmit control stage and the transmit diversity control stage, and the logical product gate is two high signals input from the control means. And multiplying and outputs the high signal multiplied by the logical power to the driving power of the second power amplifier.

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