KR20070080625A - Apparatus and method for a transmitter - receiver in multi mode - multi band portable terminal - Google Patents

Abstract

A transmitting/receiving apparatus and method of a mobile terminal supporting multi-band are provided to enhance receive sensitivity by preventing a signal loss which is generated when the first communication mode signal is received unnecessarily through a duplexer. The first antenna(100) transmits the first communication mode signal and transmits/receives the second communication mode signal. The second antenna(108) receives the first communication mode signal. A modem unit operates the first and second antennas in the first communication mode and operates only the first antenna in the second communication mode. The first communication mode is a WCDMA(Wideband Code Division Multiple Access) communication mode and the second communication mode is a GSM(Global System for Mobile Telecommunication) mode.

Description

Transmitting and Receiving Device and Method of Portable Terminal Supporting Multi-Band {APPARATUS AND METHOD FOR A TRANSMITTER-RECEIVER IN MULTI MODE-MULTI BAND PORTABLE TERMINAL}

1 is a block diagram showing a transmitting and receiving device of a portable terminal according to the present invention;

2 is a flowchart illustrating a flow of a receiving device of a portable terminal supporting multiple bands according to an embodiment of the present invention.

The present invention relates to a transmission and reception apparatus and a method of a portable terminal, and more particularly to an apparatus and method for improving the performance of a portable terminal by using an antenna for receiving a signal of a specific frequency band in a portable terminal supporting multiple bands.

The mobile communication service starts with the low-quality voice call-oriented first generation mobile communication service provided by analog cellular method, and the second generation mobile communication service uses digital cellular global system for mobile (GSM) and code division multiple access (CDMA). ) And improved voice calls and low-speed (14.4 Kbps) data services provided by TDMA (Time Division Multiple Access). In addition, in the 2.5th generation mobile communication service, the PCS (Personal Communication Service), which can be used around the world in addition to securing frequencies in the GHz band, has been developed to enable improved voice call and data services (144 Kbps).

The third generation mobile communication service is classified into asynchronous wideband code division multiple access (WCDMA) system mainly composed of 3GPP (Generation Partnership Project) and synchronous CDMA-2000 system mainly composed of 3GPP2.

In particular, the WCDMA system is a wireless protocol recommended by IMT-2000, and many telecommunication service providers around the world are providing or preparing to provide services.

WCDMA systems have a high call quality and use a spread spectrum method, which is suitable for transmitting a large amount of data. The WCDMA communication method adopts adaptive multi-rate codec (AMR) having a transmission rate of 12.2 Kbps to 4.75 Kbps for voice coding, and supports high mobility enough to make a call even if the user moves at a speed of about 100 km / h.

In addition, WCDMA communication is adopted by most countries, and 3GPP, which is composed of many organizations such as Korea, Europe, Japan, the United States, and China, is continuously developing technical specifications for WCDMA.

On the other hand, recently, due to the advantages of the WCDMA system described above, Korea, the United States, China, etc., which basically provide the CDMA-2000 service, which is a synchronous mobile communication network, have started to provide a WCDMA service by establishing a WCDMA network, an asynchronous mobile communication network. .

To this end, a multimode-multiband portable terminal supporting both a synchronous mobile network and an asynchronous mobile communication network has emerged. The multi-mode includes a synchronous mode and an asynchronous mode, and the multi-band is a second generation mobile communication service using a frequency band of 800 MHz, a second generation mobile communication service using a frequency band of 800 MHz or 1.8 GHz, approximately 2 GHz And third generation mobile communication services using the frequency band of the fourth generation mobile communication service to be serviced in the future.

However, since the portable terminal of the above-described method supports a plurality of bands using one antenna, a lot of load is generated on the antenna, and a part of the transmission signal is transmitted to the receiving end instead of the antenna, so that it is intermodulated with the actual received signal. intermodulation).

In addition, since the received signal is unnecessarily received through the duplexer, a loss of the received signal occurs, thereby reducing the reception sensitivity.

Accordingly, there is a need for an apparatus and method for reducing the load on the antenna and reducing the loss of the received signal to increase the performance of the portable terminal.

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an apparatus and method for transmitting and receiving a portable terminal supporting multiple bands.

Another object of the present invention is to provide an apparatus and method for transmitting and receiving a portable terminal having an antenna for receiving a frequency signal of a specific band.

It is still another object of the present invention to provide an apparatus and method for increasing reception sensitivity by configuring an antenna for receiving a frequency signal of a specific band independently of a duplexer for distinguishing a transmitting and receiving end of a signal.

According to a first aspect of the present invention for achieving the above object, in a transceiver of a portable terminal supporting multiple bands, a first antenna for transmitting a signal of the first communication mode and transmitting and receiving a signal of the second communication mode And a second antenna for receiving a signal in a first communication mode, a modem unit for operating the first antenna and the second antenna in the first communication mode, and operating only the first antenna in the second communication mode. It is characterized by including.

According to a second aspect of the present invention for achieving the above object, a method of receiving a portable terminal supporting multiple bands having a first antenna and a second antenna, the method comprising: checking a communication mode of the portable terminal; And when the communication mode is the first communication mode, activating the second antenna and deactivating the first antenna.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a block diagram illustrating a transceiver of a portable terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the portable terminal includes a transmitter 110, a receiver 130, a first antenna 100, and a second antenna 108. Here, the first antenna 100 transmits a signal of the first communication mode and transmits and receives a signal of the second communication mode, and the second antenna serves to receive a signal of the first communication mode. The first communication mode is a WCDMA communication mode, and the second communication mode is a GSM communication mode.

The receiver 130 operates as follows.

When the communication mode of the portable terminal is confirmed as the second communication mode, the portable terminal deactivates the second antenna and activates the first antenna to receive a signal of the second communication mode.

Thereafter, the first diplexer 102 performs high pass filtering on the received signal through a high pass filter (HPF) provided therein to separate only the frequency signal required by the portable terminal.

Thereafter, the antenna switch module 104 transmits a signal of the second communication mode received by the first antenna to the duplexer 106.

The duplexer 106 then couples the received second communication mode signal to the low noise amplifier 132.

If the communication mode of the portable terminal is determined as the first communication mode, the portable terminal deactivates the first antenna and activates the second antenna to receive a signal of the first communication mode.

Thereafter, the second diplexer 109 performs high pass filtering on the received first communication mode signal through a high pass filter (HPF) provided therein, thereby separating only the received signal required by the portable terminal to obtain a low noise amplifier. Will output The second antenna 108 is configured independently of the duplexer 106 for distinguishing the transmitting and receiving ends of the received signal and the antenna switch module 104 for distinguishing a plurality of signals having different frequencies, thereby the signal of the first communication mode. The cross modulation phenomenon occurring in the duplexer 106 may be reduced during reception.

Thereafter, when the signal received through the first antenna 100 and the second antenna 108 is connected to the low noise amplifier (LNA) 132, the low noise amplifier is configured to supply the received signal to a predetermined level. Amplified by the first high frequency bandpass filter 134 and output.

The first high frequency bandpass filter 134 outputs a received signal obtained by precisely filtering the selected band of the received signal to the first frequency converter 136.

Thereafter, the first frequency converter 136 converts the received signal into an arbitrary intermediate frequency signal required by the portable terminal, and then outputs the received signal to the first automatic gain control amplifier 138.

Thereafter, the first automatic gain control amplifier 138 amplifies the gain of the intermediate frequency signal received from the first frequency converter 136 and adjusts the gain, and then adjusts the adjusted intermediate frequency signal to the second frequency converter 140. )

Next, the second frequency converter 140 converts the intermediate frequency signal received from the first automatic gain control amplifier 138 into a baseband signal for demodulating the audio signal. Output to the modem unit 150.

The modem unit 150 operates the first antenna and the second antenna in the first communication mode, and the first modem unit 152 for demodulating a signal received by the antenna, and in the second communication mode. The second modem unit 154 operates only the first antenna and demodulates a signal received by the first antenna.

Subsequently, the modem unit 150 demodulates the baseband signal received from the second frequency converter 140, outputs an audio signal to an audio output device, and provides a voice signal to a terminal subscriber through a speaker.

When a voice signal is received from an audio input device (not shown), the modem unit 150 of the transmitter 110 modulates the voice signal and then converts a baseband signal for the modulated voice signal into a third frequency converter ( 124).

Thereafter, the baseband signal is converted into an intermediate frequency signal by the third frequency converter 124, and the gain is obtained by amplifying the intermediate frequency signal by the second automatic gain control amplifier 122 to adjust the gain. Output to the frequency converter 120. Thereafter, the fourth frequency converter 120 converts the intermediate frequency signal into a high frequency signal, and the second high frequency bandpass filter 118 filters the high frequency signal into a desired band to remove unnecessary noise, and then the high frequency amplifier 116. )

Thereafter, the high frequency amplifier 116 amplifies the received high frequency signal by the size of the signal required for operation in the power amplifier 112 of the next stage, and the third high frequency bandpass filter 114 is a signal other than the desired signal. The harmonic component is removed and then output to the power amplifier 112.

Thereafter, the duplexer 105 transmits the high frequency signal to the antenna switch module 104, the antenna switch module 104 transmits the high frequency signal to the diplexer 102, and the diplexer 102 The received high frequency signal radiates into the air through the first antenna 100.

2 is a flowchart illustrating a flow of a reception device of a portable terminal supporting multiple bands according to an embodiment of the present invention.

Referring to FIG. 2, first, in step 201, the portable terminal determines whether the communication mode of the portable terminal is the second communication mode.

If it is determined in the second communication mode, the portable terminal proceeds to step 203 to deactivate the second antenna and activate the first antenna. In step 205, the portable terminal receives a signal of the second communication mode through the first antenna.

In step 209, the portable terminal outputs the received signal to the low noise amplifier using the duplexer 106, and the portable terminal proceeds to step 211 to convert the received signal into an intermediate frequency signal. The intermediate frequency signal is converted by the first frequency converter 136 as described above with reference to FIG. 1.

In step 213, the portable terminal digitally processes the intermediate frequency signal and converts the intermediate frequency signal into a baseband signal for demodulating an audio signal. The baseband signal is converted by the second frequency converter 140 as described above with reference to FIG. 1.

In step 215, the portable terminal demodulates the baseband signal using the modem unit 150 and outputs the baseband signal to the audio output device. Herein, the modem unit 150 operates the first antenna and the second antenna in a first communication mode, demodulates a signal received by the antenna, and a first modem unit 152 in the second communication mode. The second modem unit 154 operates only the first antenna and demodulates a signal received by the first antenna.

If the communication mode of the portable terminal is determined to be the first communication mode in step 201, the portable terminal proceeds to step 217 to deactivate the first antenna and activate the second antenna. The two antennas can be configured independently of the duplexer 106 that distinguishes the transmitting and receiving ends, thereby reducing the cross modulation phenomenon occurring in the duplexer 106.

Thereafter, the portable terminal proceeds to step 219 and receives the signal of the first communication mode through the second antenna, and then the portable terminal performs the procedure from step 211. When the received signal is received through the second antenna 108, the portable terminal proceeds to step 213 to separate the frequency signal necessary for the portable terminal using the second diplexer 109 to the low noise amplifier 132. Output

Thereafter, the portable terminal starts from step 207.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, due to the load generated on the transceiver of the portable terminal using the respective antennas for receiving the signal of the first communication mode and the signal of the second communication mode to the transceiver of the portable terminal supporting the multi-band. The reception sensitivity can be increased by solving the cross modulation problem and preventing signal loss caused by unnecessarily passing through the duplexer when receiving the signal in the first communication mode.

Claims (6)

In the transceiver of a portable terminal supporting multiple bands, A first antenna for transmitting a signal in a first communication mode and transmitting and receiving a signal in a second communication mode; A second antenna for receiving a signal in a first communication mode; Operating the first antenna and the second antenna in the first communication mode, And a modem unit for operating only the first antenna in the second communication mode. The method of claim 1, Wherein the first communication mode is a WCDMA communication mode and the second communication mode is a GSM communication mode. In the receiving method of a portable terminal supporting multiple bands having a first antenna and a second antenna, Checking a communication mode of the portable terminal; Activating the second antenna when the communication mode is the first communication mode, and deactivating the first antenna. The method of claim 3, wherein And activating the first antenna and deactivating the second antenna when the communication mode is the second communication mode. The method of claim 4, wherein The first communication mode is a WCDMA communication mode, and the second communication mode is a GSM communication mode. The method of claim 4, wherein The first antenna transmits a signal in a first communication mode, transmits and receives a signal in a second communication mode, and the second antenna receives a signal in a first communication mode.

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