KR20010063688A - Apparatus for RF transmitting by power control of oscillating amplifier in RF communication system - Google Patents

Abstract

PURPOSE: A wireless signal transceiving device through a voltage control of a local oscillating amplifier in a wireless communication system is provided to change a bias voltage of the local oscillating amplifier, and to control gains of transceiving mixers according to a local oscillating power size. Therefore, it is possible to substitute a function of an automatic gain control amplifier, and to simply an RF(Radio Frequency) transceiving terminal structure. CONSTITUTION: A main processor(21) controls an RF(Radio Frequency) transceiving function, and controls to perform an automatic gain control by the first and the second local oscillating amplifier(24,25). A local oscillator(22) makes a frequency corresponding to a difference between an IF(Intermediate Frequency) and the RF, and outputs a local oscillating power. A power distributor(23) distributes signals outputted from the local oscillator(22). The first and the second local oscillating amplifier(24,25) respectively receive the distributed signals, and perform a local oscillating amplification and an automatic gain control amplification according to control of the main processor(21). The first mixer(26) receives the amplified signal from the first local oscillating amplifier(24), and receives an IF transmitting signal, then mixes the amplified signal with the IF transmitting signal to output an RF transmitting signal. The second mixer(27) receives the amplified signal from the second local oscillating amplifier(25), and receives an RF receiving signal to output an IF receiving signal.

Description

Apparatus for RF transmitting by power control of oscillating amplifier in RF communication system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless signal transmission and reception apparatus through voltage control of a local oscillation amplifier of a wireless communication system. In particular, the present invention is used to compensate for insufficient local oscillation power in a radio frequency (RF) transmitter / receiver. By varying the bias voltage of the local oscillation amplifier, it adjusts the gain of the transmit / receive mixer that changes according to the local oscillation power size to replace the function of the automatic gain control amplifier and to simplify the configuration of the RF transceiver. The present invention relates to a wireless signal transmission / reception apparatus through voltage control of a local oscillation amplifier of a communication system.

In general, a communication system is a system that performs information processing by combining a terminal with a remote communication line, and there are wired and wireless communication systems.

The present invention is used in a wireless communication system such as a CDMA WLL system.

Such a wireless communication system is a communication system for a mobile body such as a person, a car, a ship, a train, an aircraft, such as a mobile phone (mobile phone, a vehicle phone), a port phone, an aircraft phone, a mobile public phone (train, cruise ship, Installed on express buses, radio calls, radiotelephones, satellite communications, amateur radio, and fishing service ships. These communications include the Advanced Mobile Phone Service (AMPS) system using analog methods, the CDMA and TDMA (Time Division Multiple Access) systems using digital methods, and the Frequency Division Multiple Access (FDMA) systems. , WLL (Wireless Local Loop) system.

In addition, a WLL system using a code division multiple access (CDMA) wireless access standard can be divided into N-CDMA (Narrowband-CDMA) (IS-95) and W-CDMA (Wideband -CDMA). Compared to the CDMA scheme, the W-CDMA scheme has a difference in frequency bandwidth, voice band data rate, and ISDN BRI (2B + D) service.

In addition, the wireless subscriber network system is a system that replaces a predetermined section between each subscriber's home and the public switched telephone by wireless instead of wires in the existing Public Switching Telephone Network (PSTN) system. Responsible for connection and disconnection of a bearer by a mobile terminal (MT) that receives a user's signal from a telephone (TE) in a home and transmits the signal to a base station, and the subscriber wireless access device (RIU) wirelessly. A base station controller (BS), a base station controller (BSC) that performs a function of connecting a call link between the switch and the base station, and an existing public line switching network (PSTN); It consists of a mobile subscriber line network switch (MSC) that is responsible for link establishment of a call.

Therefore, the wireless subscriber network can easily install the telephone network than the existing wired network system, the cost of facility expansion is low, and the flexibility of the network design according to the increase of subscribers has the advantage.

In addition, unlike conventional narrowband CDMA networks, W-CDMA wireless subscriber systems enable the implementation of integrated services digital network (ISDN) services and packet networks as well as call, fax and data transmission. .

1 is a block diagram of a wireless signal transmission and reception apparatus through local oscillation amplifier voltage control in a conventional wireless communication system.

As shown therein, the main processor 11 controls a function for RF transmission and reception; A local oscillation unit 12 for outputting local oscillation power; A power distribution unit 13 for distributing the signal output from the local oscillation unit 12; First and second local oscillation amplifiers 14 and 15 for receiving and amplifying the signals distributed by the power distribution unit 13, respectively; First and second mixers 16, which receive signals amplified by the first and second local oscillation amplifiers 14 and 15, respectively, and combine with an IF (Intermediate Frequency) transmission signal or an RF reception signal, respectively; 17); A first automatic gain control amplifier 18 for outputting an RF transmission signal by performing automatic gain control and amplification on the output of the first mixer 16; An IF SAW filter 19 for performing IF SAW filtering on the output of the second mixer 17; The second automatic gain control amplifier 20 outputs an IF received signal by performing automatic gain control and amplification on the output of the IF SAW filter 19.

The operation of the conventional apparatus configured as described above is as follows.

First, the RF transmitting / receiving stage should use the local oscillator 12 to perform frequency conversion from the intermediate frequency (IF) band to the high frequency (RF) band or from the high frequency band to the intermediate frequency band.

The output from the local oscillator 12 is often insufficient to directly use, so that the first and second local oscillation amplifiers (compensated for insufficient local oscillation power so that a larger power can be input to the transmission / reception mixer (mixer)) 14) (15) were used.

In addition, the intensity of the final transmit power is adjusted as desired and the intensity of the received power input to the host device must be kept constant for accurate operation of the host device for wireless communication. The first and second automatic gain control amplifiers 18 and 20 Has been used for this purpose.

That is, in the conventional structure, the local oscillation amplifier and the automatic gain control amplifier have been used for completely different purposes.

The operation of such a conventional device will be described once again.

The RF transceiver for wireless communication uses the local oscillator 12 for modulation between the intermediate frequency band and the RF frequency band. The local oscillator 12 serves to make a frequency corresponding to the difference between the intermediate frequency and the RF frequency.

Here, since the output signal of the local oscillator 12 itself does not supply enough power to the mixer to modulate the intermediate frequency band and the RF frequency band to each other, the first and second local parts to amplify the output signal of the local oscillator 12. The oscillation amplifier sections 14 and 15 are used.

In the case of transmission, the first automatic gain control amplifier 18 is used to precisely adjust the final transmission output of the modulated RF frequency band using the output signal of the local oscillator 12. The first automatic gain control amplifier 18 refers to an amplifier capable of adjusting the intensity of the output signal within a specific range according to the magnitude of the bias voltage.

In the case of reception, the input signal strength of the main device must be constant for effective and accurate operation of the main device for wireless communication. In order to perform this role, the second automatic gain control amplifier 20 is used at the receiving end.

For this purpose, several automatic gain control amplifiers have been used in the RF transceiver stage.

However, in the wireless communication system according to the prior art, since the local oscillation amplifier and the automatic gain control amplifier are used for completely separate purposes, the entire system becomes complicated and the unit cost increases. As the demand for a system that is simpler and less bulky and weighty increases, the need for simpler and more efficient RF transceivers also increases.

Accordingly, the present invention has been proposed to solve the above-mentioned general problems, and an object of the present invention is to bias bias voltage of a local oscillation amplifier which is used to compensate for the local oscillation power which is insufficient in the RF transmitter / receiver for wireless communication. Local oscillation amplifier voltage control of wireless communication system that can control the gain of transmit / receive mixer which changes according to local oscillation power size to replace the function of automatic gain control amplifier and simplify the configuration of RF transceiver. It is to provide a wireless signal transmission and reception apparatus through.

In order to achieve the above object, a wireless signal transmission and reception apparatus through local oscillation amplifier voltage control of a wireless communication system according to the present invention,

A main processor controlling a function for RF transmission and reception and controlling the first and second local oscillating amplifiers to perform automatic gain control; A local oscillator for generating a frequency corresponding to a difference between an intermediate frequency and an RF frequency and outputting local oscillation power; A power distribution unit for distributing the signal output from the local oscillation unit; First and second local oscillation amplifiers each receiving the signals distributed by the power distribution unit and performing local oscillation amplification and automatic gain control amplification according to the control of the main processor; A first mixer which receives a signal amplified by the first local oscillation amplifier, receives an IF transmission signal, mixes it, and outputs an RF transmission signal; The technical configuration of the second local oscillation amplifier is a second mixer for receiving the signal amplified, receives the RF received signal and outputs the IF received signal.

1 is a block diagram of an apparatus for transmitting and receiving a wireless signal through voltage control of a local oscillation amplifier in a conventional wireless communication system.

2 is a block diagram of an apparatus for transmitting and receiving a wireless signal through local oscillation amplifier voltage control in a wireless communication system according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

21 main processor 22 local oscillator

23: power distribution unit 24, 25: local oscillation amplifier

26, 27: mixer

Hereinafter, an embodiment according to the technical idea of the apparatus for transmitting and receiving a wireless signal through the local oscillator voltage control of the wireless communication system as described above is as follows.

2 is a block diagram of an apparatus for transmitting and receiving a wireless signal through local oscillation amplifier voltage control in a wireless communication system according to an embodiment of the present invention.

As shown therein, the main processor 21 controls a function for RF transmission and reception and controls the first and second local oscillation amplifiers 24 and 25 to perform automatic gain control; A local oscillator 22 for generating a frequency corresponding to a difference between an intermediate frequency and an RF frequency and outputting local oscillation power; A power distribution unit 23 for distributing the signal output from the local oscillation unit 22; First and second local oscillation amplifiers 24 and 25 which receive the signals distributed by the power distribution unit 23 and perform local oscillation amplification and automatic gain control amplification under the control of the main processor 21. )Wow; A first mixer (26) for receiving a signal amplified by the first local oscillating amplifier (24), receiving an IF transmission signal, mixing the mixture, and outputting an RF transmission signal; The second local oscillating amplifier 25 is configured to receive a signal amplified, a second mixer 27 for receiving an RF reception signal and outputting an IF reception signal.

The operation of the apparatus for transmitting and receiving a wireless signal through the local oscillator voltage control of the wireless communication system according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, the present invention consists of applying a voltage controlled by the main processor 21 to a bias stage of a local oscillation amplifier in a conventional wireless communication system RF transceiver structure. In the conventional apparatus, the RF final transmit power and the intensity of the received signal for the main processor are controlled by controlling the bias voltage of the auto gain control amplifier in the main processor. In the present invention, the bias control voltage of the main processor 21 is automatically gained. By walking to the local oscillation amplifiers 24 and 25 instead of the control amplifier, the local oscillation amplifiers 24 and 25 perform two functions simultaneously, including the role of automatic gain control in addition to the original role of amplification of the local oscillation signal. Let's do it.

Local oscillating amplifiers can perform two roles at the same time, thereby reducing the number of auto gain control amplifiers needed, since they can take on the job.

This operation of the present invention will be described in more detail.

When the main processor 21 of the terminal needs to adjust the terminal final transmit power intensity while exchanging signals with the base station, it has been able to play such a role by controlling the bias voltage of the automatic gain control amplifier of the RF transmitter in the main processor.

On the other hand, in the present invention, the local oscillation amplifier plays the role of the automatic gain control in addition to the amplification of the local oscillation signal by applying a control signal from the main processor to the local oscillation amplifier instead of the automatic gain control amplifier to control the bias voltage of the automatic gain control amplifier. To be able to.

Therefore, when transmitting a signal from the terminal to the base station, the final transmission power should be adjusted to an appropriate value to improve the performance of the whole system. For this purpose, if the bias voltage of the transmitter local oscillation amplifier is controlled and changed by the main processor 21, the intensity of the local oscillation signal entering the transmitter mixer (first mixer) is changed, and thus the RF frequency band passed through the mixer. The magnitude of the signal will change.

Therefore, the same result as that of the automatic gain control amplifier can be obtained.

When the terminal receives the signal of the base station, the signal of the RF frequency band is first modulated into an intermediate frequency band, and the modulated intermediate frequency signal is processed by the main processor 21. In this case, the signal input to the main processor 21 The intensity must be constant so that the main processor 21 can operate correctly.

To control the bias voltage of the receiver local oscillation amplifier in the host device to perform this role, the strength of the local oscillation signal entering the receiver mixer (second mixer) is changed, and thus The magnitude is changed and the same result as the operation of the automatic gain control amplifier is obtained.

By arranging these results through various measurements and adjusting the bias control signal from the main processor 21 for each of the transceivers, the RF transceiver can be designed to operate effectively even if the automatic gain control amplifier is removed from the system. It becomes possible.

As such, the present invention changes the bias voltage of the local oscillation amplifier to adjust the gain of the transmit / receive mixer that varies according to the local oscillation power size to replace the function of the automatic gain control amplifier, and to simplify the configuration of the RF transceiver. will be.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, the wireless signal transmission and reception apparatus through the local oscillation amplifier voltage control of the wireless communication system according to the present invention local oscillation in the automatic gain control amplifier to position the voltage control signal of the main processor in the structure of the RF transceiver end of the wireless communication system Local oscillating amplifiers, which must be used essentially, can be replaced by automatic gain control amplifiers by switching to amplifiers and adding minor modifications to the main processor's software, simplifying the structure of the RF transceiver and reducing manufacturing costs. Will be.

Claims (1)

A main processor controlling a function for RF transmission and reception and controlling the first and second local oscillating amplifiers to perform automatic gain control; A local oscillator for generating a frequency corresponding to a difference between an intermediate frequency and an RF frequency and outputting local oscillation power; A power distribution unit for distributing the signal output from the local oscillation unit; First and second local oscillation amplifiers each receiving the signals distributed by the power distribution unit and performing local oscillation amplification and automatic gain control amplification according to the control of the main processor; A first mixer which receives a signal amplified by the first local oscillation amplifier, receives an IF transmission signal, mixes it, and outputs an RF transmission signal; Wireless signal transmission and reception through the local oscillation amplifier voltage control of the wireless communication system, characterized in that the second mixer for receiving the signal amplified by the local oscillation amplifier, receives the RF reception signal and outputs the IF reception signal Device.