KR20050041366A - Rf receiver for radio communication which receive ones place information and digital multimedia broadcasting signal - Google Patents

Abstract

The present invention relates to an RF receiver for a wireless communication terminal, comprising: a GPS receiver capable of receiving a magnetic position information signal, a digital multimedia broadcasting (DMB) receiver capable of receiving a digital multimedia broadcasting signal, and a phase synchronization circuit. (PLL) and two frequency-controlled oscillators that output different local oscillation signals, and a frequency synthesizer incorporating a frequency doubler, are commonly used in GPS receivers and digital multimedia broadcasting (DMB) receivers. Is implemented.

Description

RF receiver for radio communication which receives ones place information and digital multimedia broadcasting signal}

The present invention relates to an RF receiver for a wireless communication terminal, and more particularly, to an RF receiver for a wireless communication terminal having both a magnetic location information and a digital multimedia broadcasting (DMB) reception function.

In general, radio communication refers to the communication of information such as signal, code, video, and voice through radio waves. Currently, representative radio communication includes satellite communication and mobile telecommunication. Etc. Satellite communication is a radio communication that allows satellites to be launched from outside the air to relay communications. It is used to service broadcasting, communications, flood control and forecasting, river monitoring, weather observation and air quality measurement, and self-location information. . Mobile communication is a radiotelephone communication in which a mobile vehicle such as a car, an aircraft, a train, a ship, or people on a walk can communicate with each other or with a counterpart in a fixed location.

Until recently, mobile communication was only a means of exchanging calls and texts. However, with the recent development of mobile communication technology and the opening of satellite communication services to the private sector, mobile communication providers can provide services provided by satellite communication to mobile communication terminals. Currently, domestic mobile operators are manufacturing and launching terminals equipped with GPS receivers capable of receiving magnetic location information signals. Furthermore, mobile carriers are planning to provide a service that enables them to watch digital multimedia broadcasting using broadcast satellites as the technology of loading memory capable of storing a large amount of digital multimedia such as video and music video is developed. have.

Increasingly, mobile communication providers are increasingly equipped with receivers capable of receiving magnetic location information signals and digital multimedia broadcasting (DMB) signals in portable mobile communication devices. However, if the receivers that can receive the two services in one device are independently implemented, the use of many components is inevitable, which increases the manufacturing cost of the terminal as well as the size of the device, which inevitably reduces portability. In addition, there is a problem that the portable terminal must be implemented to properly receive a broadcast signal even in a complex terrain with a lot of radio interference such as buildings or trees.

The present invention has been made to solve the above problems, and is realized at low cost by reducing the number of parts and the area occupied by the parts, and wireless communication having both a self-location information and a digital multimedia broadcasting (DMB) receiving function enabling the miniaturization of the terminal. It is an object of the present invention to provide an RF receiver for a terminal.

Furthermore, an object of the present invention is to provide an RF receiver for a wireless communication terminal having both a magnetic location information having a high reception rate of a digital multimedia broadcasting signal and a digital multimedia broadcasting (DMB) reception function even in a complicated terrain with many radio interferences.

RF receiver for a wireless communication terminal according to an aspect of the present invention for achieving the above object is a GPS receiver capable of receiving a magnetic location information signal and a digital multimedia broadcasting (DMB) capable of receiving a digital multimedia broadcasting signal GPS receiver and digital multimedia broadcasting receiver It is implemented so that the frequency synthesizer can be used in common.

According to the characteristic aspect of the present invention, the terminal manufacturer can reduce the number of parts and the area occupied by the component, thereby realizing the RF receiver for the wireless communication terminal at low cost, and further miniaturizing the terminal.

 RF receiver for a wireless communication terminal according to another aspect of the present invention is implemented to reduce the interference of the signal by the multi-path, and to increase the reception rate of the receiver by connecting two of the same digital multimedia broadcasting receiver in parallel.

According to the characteristic aspect of the present invention, the user can receive a smooth communication service even when the terminal is located in a complicated terrain with a lot of radio interference.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily understand and reproduce the present invention.

1 schematically illustrates the overall configuration of a digital multimedia broadcasting (DMB) service system according to an embodiment of the present invention.

As shown in the drawing, the digital multimedia broadcasting (DMB) service system receives a broadcasting station 10 that provides various broadcasting programs such as a moving picture, a music video, a drama, and a broadcast signal 14㎓ transmitted from the broadcasting station 10. Digital broadcast satellite 20 for transmitting a broadcast signal of 2.6 GHz band or 14 GHz band, a gap filler 30 for receiving a broadcast signal of 14 GHz band and outputting a broadcast signal of 2.6 GHz band and a digital broadcast satellite ( 20) or a mobile terminal 40 for receiving a broadcast signal of 2.6 GHz band from a repeater (Gap filler) 30. Currently, domestic mobile carriers have signed a contract to jointly use digital broadcasting satellites launched by MBCo in Japan as the digital broadcasting satellites (20). In 2004, TV, radio, etc. can be used anytime, anywhere through a vehicle or mobile phone. It is planning to provide various high quality broadcasting services. In addition, a number of repeaters (Gap filler) are being installed to supplement the shadow area such as the city center, and the development of communication technology for receiving and processing digital multimedia broadcasting signals and displaying them to the user is nearing completion.

Hereinafter, in the description of the present embodiment, the digital multimedia broadcasting receiver is referred to as a DMS receiver, and the GPS receiver is designated as a GPS receiver.

2 is a block diagram schematically showing an internal configuration of an RF receiver for a wireless communication terminal according to an embodiment of the present invention. As shown, an RF receiver for a wireless communication terminal includes a DMS receiver, a GPS receiver, and a frequency synthesizer, each of which uses a frequency synthesizer in common. The DMS receiver includes a DMS antenna 41, a low noise amplifier 42, a band pass filter 43, a frequency converter 44, a channel filter 45, and an orthogonal demodulator 46. The GPS receiver includes a GPS chip antenna 61, a band pass filter 62, a GPS low noise amplifier 63, a frequency converter 64, a band pass filter 65, and an orthogonal demodulator 66. The frequency synthesizer includes a phase synchronizing circuit part 47, a first voltage controlled oscillator 48, a frequency doubler 49, and a second voltage controlled oscillator 50.

The DMS antenna 41 receives a broadcast signal transmitted from the digital broadcast satellite 20 or the repeater 30, wherein the received broadcast signal is a 2.6 GHz band signal of 2630 to 2655 MHz or 2.6 GHz of 2605-2630 MHz. It may be a band signal. The low noise amplifier 42 amplifies the pure broadcast signal among the broadcast signals input from the DMS antenna 41 and suppresses and outputs the noise. A band-pass filter 43 passes only a broadcast signal band, for example, 2630 to 2655 MHz among the signals input from the low noise amplifier 42, and removes all other signals. The frequency converter 44 generates a signal including an intermediate frequency by mixing the broadcast signal input from the band pass filter 43 and the local oscillation signal input from the frequency synthesizer. The channel filter 45 removes various harmonics and interference signals from the signal input from the frequency converter 44 and outputs only an intermediate frequency signal. The quadrature demodulator 46 orthogonally detects the intermediate frequency signal received from the channel filter 45 using the local oscillation signal input from the frequency synthesizer.

The GPS chip antenna 61 is for receiving a GPS signal of 1575.42 MHz transmitted from a GPS satellite. Currently, the GPS chip antenna 61 is commercially available that is manufactured by Qualcomm of USA or various domestic manufacturers. The band pass filter 62 passes only the GPS signal of 1575.42 MHz among the signals input from the GPS chip antenna 61 and removes all other signals. The low noise amplifier 63 amplifies the pure GPS signal among the GPS signals input from the band pass filter 62 and suppresses and outputs the noise. The frequency converter 64 generates a signal including an intermediate frequency by mixing the GPS signal input from the low noise amplifier 63 and the local oscillation signal input from the frequency synthesizer. The band pass filter 65 removes various harmonics and interference signals from the signal input from the frequency converter 64 and outputs only an intermediate frequency signal. The orthogonal demodulator 66 orthogonally detects the intermediate frequency signal received from the band pass filter 65.

 The phase synchronization circuit unit 47 is driven by a control and data signal input from the control unit of the terminal to control the oscillation output of the voltage controlled oscillator, and is preferably implemented as a twin phase synchronization circuit (TWIN PLL). The first voltage controlled oscillator 48 not only local oscillation signal necessary for the frequency converter 44 of the DMB receiver but also local oscillation signal necessary for the frequency converter 64 of the GPS receiver according to the control signal from the phase synchronization circuit part 47. to provide. In one embodiment, the phase synchronization circuit 47 controls the first voltage controlled oscillator 48 to oscillate a 1522.5 MHz local oscillation signal when a control signal for receiving a broadcast signal is input from the controller. In one embodiment, the phase synchronization circuit unit 47 controls the first voltage controlled oscillator 48 to oscillate a local oscillation signal of 1391.82 MHz when a control signal for receiving a GPS signal is input from the controller. The frequency doubler 49 doubles the local oscillation signal input from the first voltage controlled oscillator 48 and outputs a local oscillation signal of 3045 MHz. The second voltage controlled oscillator 50 generates a local oscillation signal of a predetermined frequency, for example, 805 MHz, and outputs it to the quadrature demodulator 46 according to the control signal from the phase synchronization circuit section 47.

3 is a block diagram schematically illustrating an internal configuration of an RF receiver for a wireless communication terminal according to another embodiment of the present invention. Here, the same or corresponding components as in FIG. 2 use the same reference numerals, and descriptions thereof will be omitted.

As shown, the RF receiver for a wireless communication terminal according to the present embodiment further includes a DMB receiver in the RF receiver according to the embodiment of FIG. 2, by connecting two identical DMB receivers in parallel to reduce interference of a signal by multiple paths. The receiver is implemented to increase the reception rate of the receiver. The DMB receiver added in this embodiment is implemented to use a local oscillation signal input from the frequency synthesizer. That is, the frequency converter 54 receives the local oscillation signal of 3045 MHz, which is oscillated in the first voltage controlled oscillator 48 and doubled in the frequency doubler 49. In addition, the quadrature demodulator 56 receives a 805 MHz local oscillation signal output from the second voltage controlled oscillator.

4 is a block diagram schematically showing an internal configuration of an RF receiver for a wireless communication terminal according to another embodiment of the present invention. Here, the same or corresponding components as in FIG. 2 use the same reference numerals, and descriptions thereof will be omitted.

As shown, in the RF receiver for a wireless communication terminal according to the present embodiment, the first voltage controlled oscillator 48 generates a local oscillation signal of 3045 MHz by the control signal from the phase synchronization circuit part 47, and the second The voltage controlled oscillator 49 receives a control signal from the phase synchronization circuit unit 47 and provides a local oscillation signal necessary for the frequency converter 44 of the DMB receiver and a local oscillation signal necessary for the frequency converter 64 of the GPS receiver.

In one embodiment, the phase synchronization circuit part 47 controls the second voltage controlled oscillator 49 to oscillate a local oscillation signal of 805 MHz when a control signal for receiving a broadcast signal is input from the controller of the terminal. In one embodiment, the phase synchronization circuit part 47 controls the second voltage controlled oscillator 49 to oscillate a local oscillation signal of 695.91 MHz when a control signal for receiving a GPS signal is input from the controller. At this time, the frequency converter 64 of the GPS receiver receives a 1391.8 MHz local oscillation signal amplified twice in the frequency doubler 49.

5 is a block diagram schematically showing an internal configuration of an RF receiver for a wireless communication terminal according to another embodiment of the present invention. Here, the same or corresponding components as in FIG. 4 use the same reference numerals, and descriptions thereof will be omitted.

As shown, the RF receiver for a wireless communication terminal according to the present embodiment further includes a DMB receiver in the RF receiver according to the embodiment of FIG. 4, and reduces the interference of signals by multiple paths by connecting two identical DMB receivers in parallel. The receiver is implemented to increase the reception rate of the receiver. The DMB receiver added in this embodiment is implemented to use a local oscillation signal input from the frequency synthesizer. That is, the frequency converter 54 receives the local oscillation signal of 3045 MHz, which is oscillated in the first voltage controlled oscillator 48 and doubled in the frequency doubler 49. In addition, the quadrature demodulator 56 receives a 805 MHz local oscillation signal output from the second voltage controlled oscillator.

As described above, the RF receiver for wireless communication according to the present invention is configured to perform a local oscillation signal required for a frequency converter and an orthogonal demodulator and a local oscillation signal for a GPS receiver and an orthogonal demodulator using a single frequency synthesizer. By reducing the number of parts and the area occupied by the proposal, RF receivers for wireless communication terminals can be implemented at low cost, and further miniaturization of terminals can be achieved.

Furthermore, the RF receiver for wireless communication according to the present invention has a useful effect of reducing interference of a signal caused by multiple paths and increasing a receiver's reception rate by applying diversity by connecting two identical DMB receivers in parallel. Accordingly, the user can receive a smooth communication service even when the terminal is located in a complicated terrain with a lot of radio interference.

Although the present invention has been described with reference to the accompanying drawings, it will be apparent to those skilled in the art that many various obvious modifications are possible without departing from the scope of the invention from this description. Therefore, it should be interpreted by the claims described to include many such variations.

1 schematically illustrates the overall configuration of a digital multimedia broadcasting (DMB) service system according to an embodiment of the present invention.

2 is a block diagram schematically showing an internal configuration of an RF receiver for a wireless communication terminal according to an embodiment of the present invention.

3 is a block diagram schematically illustrating an internal configuration of an RF receiver for a wireless communication terminal according to another embodiment of the present invention.

4 is a block diagram schematically showing an internal configuration of an RF receiver for a wireless communication terminal according to another embodiment of the present invention.

5 is a block diagram schematically showing an internal configuration of an RF receiver for a wireless communication terminal according to another embodiment of the present invention.

Claims (4)

An RF receiver for a wireless communication terminal, the RF receiver comprising: A first low noise amplifier for amplifying the broadcast signal input from the digital broadcast satellite through the first receiving antenna; A first band pass filter for passing only frequencies of a predetermined band among the signals input from the first low noise amplifier; A first frequency converter for mixing a signal input from the first bandpass filter and a local oscillating signal inputted to output a signal including an intermediate frequency; A first channel filter for passing only an intermediate frequency of the signals input from the first frequency converter to the first quadrature demodulator; A first digital multimedia broadcasting receiver comprising a; A GPS chip antenna for transmitting and receiving magnetic location information signals; A second band pass filter for passing only signals of a predetermined band among the signals input from the GPS chip antenna; A second low noise amplifier for amplifying a signal input from the second band pass filter; A second frequency converter for mixing a signal input from the second low noise amplifier and a predetermined local oscillation signal and outputting a signal including an intermediate frequency; A third band pass filter for passing only an intermediate frequency of the signals input from the second frequency converter to a second quadrature demodulator; GPS receiver comprising a; A phase synchronizing circuit part (PLL) for controlling the voltage controlled oscillator according to a driving control signal input from the control unit; A first voltage controlled oscillator for outputting a predetermined local oscillation signal to a first quadrature demodulator in accordance with a control signal from the phase synchronization circuit section PLL; A second voltage controlled oscillator for outputting a predetermined local oscillation signal in accordance with a control signal from the phase synchronization circuit portion PLL; A frequency doubler for amplifying a local oscillating signal input from the second voltage controlled oscillator twice and outputting the same to the first frequency converter, And the second frequency converter receives a predetermined local oscillation signal from the second voltage controlled oscillator. The RF receiver of claim 1, wherein the RF receiver for a wireless communication terminal comprises: A third low noise amplifier for amplifying the broadcast signal input from the digital broadcasting satellite through the second receiving antenna; A fourth band pass filter for passing only frequencies of a predetermined band among the signals input from the third low noise amplifier; A third frequency converter for outputting a signal including an intermediate frequency by mixing a signal input from the fourth bandpass filter and an input local oscillation signal; A second channel filter for passing only an intermediate frequency among the signals input from the third frequency converter to a third quadrature demodulator; Further comprising a second digital multimedia broadcasting receiver comprising: And the third frequency converter receives a local oscillation signal input from the frequency doubler. An RF receiver for a wireless communication terminal, the RF receiver comprising: A first low noise amplifier for amplifying the broadcast signal input from the digital broadcast satellite through the first receiving antenna; A first band pass filter for passing only frequencies of a predetermined band among the signals input from the first low noise amplifier; A first frequency converter for mixing a signal input from the first bandpass filter and a local oscillating signal inputted to output a signal including an intermediate frequency; A first channel filter for passing only an intermediate frequency of the signals input from the first frequency converter to the first quadrature demodulator; A first digital multimedia broadcasting receiver comprising a; A GPS chip antenna for transmitting and receiving magnetic location information signals; A second band pass filter for passing only a GPS signal of a predetermined band among the signals inputted from the GPS chip antenna; A second low noise amplifier for amplifying a signal input from the second band pass filter; A second frequency converter for mixing a signal input from the second low noise amplifier and a predetermined local oscillation signal and outputting a signal including an intermediate frequency; A third band pass filter for passing only an intermediate frequency of the signals input from the second frequency converter to a second quadrature demodulator; GPS receiver comprising a; A phase synchronizing circuit part (PLL) for controlling the voltage controlled oscillator according to a driving control signal input from the control unit; A first voltage controlled oscillator for outputting a predetermined local oscillation signal to the first frequency converter in accordance with a control signal from the phase synchronization circuit section (PLL); A second voltage controlled oscillator for outputting a predetermined local oscillation signal to a first quadrature demodulator in accordance with a control signal from the phase synchronization circuit section PLL; A frequency doubler for amplifying twice the local oscillation signal output from the second voltage controlled oscillator and outputting the amplified signal to the second frequency converter; RF receiver for a wireless communication terminal comprising a. The RF receiver of claim 3, wherein the RF receiver for a wireless communication terminal comprises: A third low noise amplifier for amplifying the broadcast signal input from the digital broadcasting satellite through the second receiving antenna; A fourth band pass filter for passing only frequencies of a predetermined band among the signals input from the third low noise amplifier; A third frequency converter for outputting a signal including an intermediate frequency by mixing a signal input from the fourth bandpass filter and an input local oscillation signal; A second channel filter for passing only an intermediate frequency among the signals input from the third frequency converter to a third quadrature demodulator; Further comprising a second digital multimedia broadcasting receiver comprising: And the third frequency converter receives a local oscillation signal from the first voltage controlled oscillator.