KR100677851B1 - Wireless Transceiver apparatus having Transceiver route by one Mixer and band pass filter, and the ASK modulation for data transmitting and frequency conversion in the receving - Google Patents

Abstract

According to the present invention, a mixer and a band pass filter provided in a transmission / reception path alternately perform an amplitude shift modulation function and a frequency conversion function in a half-duplex bidirectional wireless communication transceiver in which transmission and reception are alternately performed by a time division method. Compared with the independent path, the wireless communication transceiver which sets the transmission / reception path by the mixer and the band pass filter that can simplify the circuit configuration and improve the product competitiveness, and the amplitude shifting and reception frequency conversion of the transmission frequency using the same It is about a method.

To this end, the present invention provides a transmission and reception data separator for separating the transmission data and the received data signal applied from the antenna in the half-duplex two-way wireless communication transceiver, and applied from the transmission data and the high frequency local oscillator separated by the transmission and reception data separator. Amplitude shift modulation of the transmission data is performed by mixing a local oscillation signal, and then transmitted to a transmission path, while converting received data input from the antenna into an intermediate frequency signal together with the local oscillation signal, and converting the received data through the reception path. There is provided a mixer for transmitting an intermediate frequency signal, and a wireless communication transceiver connected to the mixer and provided with a band pass filter for limiting a band of the transmission data or removing unnecessary signals included in the received data in a transmission / reception joint path. ;

In addition, when the transmission data is applied from the state that only the transmission path for transmission is activated, a process of mixing and modulating in the mixer together with the local oscillation signal applied from the high frequency local oscillation unit, the modulated signal is band-limited in the band pass filter And amplified through an active transmission path provided by the antenna and radiating the same through an antenna; And when received data is applied through the antenna from only a reception path for reception, the frequency conversion is performed in the mixer together with a local oscillation signal applied from a high frequency local oscillator and demodulated in a form of received data according to amplitude shift demodulation. There is provided a method for amplitude shift modulation and reception frequency conversion of a transmission frequency.

Time division half duplex bidirectional communication, mixer, transmit amplitude shift modulation, frequency conversion, transmit and receive path.

Description

Wireless communication transceiver having a transmission / reception path set by a mixer and a band pass filter, and a method of converting amplitude and amplitude of a transmission frequency using the same. {Wireless Transceiver apparatus having Transceiver route by one Mixer and band pass filter, and the ASK modulation for data transmitting and frequency conversion in the receving}

1 is a block diagram showing a wireless communication handset device that is generally provided separately transmit and receive paths,

2 is a block diagram showing a wireless communication transceiver in which transmission and reception paths are alternately set by a mixer and a band pass filter according to an embodiment of the present invention;

3 is a detailed circuit diagram of the data transceiver of FIG. 2;

4 is a flowchart illustrating a method for amplitude modulation and transmission frequency conversion of a transmission frequency according to a transmission / reception path according to the present invention.

* Explanation of symbols for main parts of drawings *

200: high frequency local oscillation unit, 211: mixer,

212: band pass filter, 220, 240: first and second switches,

230: high frequency amplifier, 250: antenna,

260: low noise amplifier, 270: transmission and reception data separator,

271: low pass filter, 272: high pass filter.

The present invention relates to a wireless communication transceiver, and more particularly, to a mixer and a band pass filter for transmitting / receiving data by alternately setting a wireless communication transmission / reception path between a base station and a terminal according to a time division scheme by one mixer. The present invention relates to a wireless communication transceiver having a transmission / reception path set therein, and a amplitude shift modulation and a reception frequency conversion method using the same.

As is well known, wireless communication between a base station and an unspecified number of terminals, such as Intelligent Transportation Systems (ITS) short range wireless communication systems (DSRC) operating in the 5.8 GHz band or wireless LAN (WLAN) systems operating in the 2.4 GHz band As a communication method, a half-duplex bidirectional method in which a transmission path and a reception path are alternately established and communicated according to a time division method is applied.

That is, the half-duplex bidirectional communication method is a communication method capable of transmitting data in both directions but not simultaneously in both directions, and at any point in time, may transmit data in only one direction.

In the half-duplex bidirectional communication scheme, a transmission path for modulating the baseband signal in the transmission path and transmitting the amplitude shift signal to the antenna and a reception path for converting the high frequency signal received from the antenna into an intermediate frequency through a mixer are separately provided.

This will be described with reference to FIG. 1.

1 is a block diagram showing a wireless communication transceiver generally provided separately a transmission and reception path.

As shown, a transmission path unit 130 for transmitting the transmission data to the antenna 150 and a reception path unit 110 for processing data received from the antenna 150 is provided, the transmission path unit 130 ) And the high frequency local oscillation signal from the high frequency local oscillator 121 to one of the path units 130 and 110 according to the switching of the high frequency switch 122 so that the amplitude shift modulation and the frequency conversion are respectively performed in the reception path unit 110 and the reception path unit 110. Delivered.

The transmission path unit 130 may include a baseband filter 134 for limiting a predetermined band among the bands of data to be transmitted, and an amplitude shift modulator for performing an amplitude shift modulation process on data transmitted from the baseband filter 134. 133), a bandpass filter 132 for passing only a specific band among the bands of the amplitude shift-modulated data, and power amplified data transmitted from the bandpass filter 132, and the transmission path is secured by the switch 140. It consists of a transmission power amplifier 131 for transmitting to the antenna 150.

In addition, the reception path unit 110 is a low noise amplifier 116 for amplifying the received signal when the signal received from the antenna 150 is secured by the switch 140, to remove unnecessary signals from the amplified signal Band pass filter 115, the intermediate frequency converter 114 for converting the frequency band of the received signal into the intermediate frequency band and the intermediate frequency amplifier 113 for amplifying, the filter 112 for passing only the required band, the filter 112 It consists of an amplitude shift demodulator 111 for demodulating the baseband of the signal transmitted from the.

In the conventional wireless communication device configured as described above, a signal is applied from the high frequency local oscillator 121 to the transmission path 130 or the reception path 110 according to the switching of the high frequency switch 122, and thus the transmission. Since the path unit 130 and the reception path unit 110 are independently activated, stable signal processing can be performed without interference.

However, since the transmission / reception path unit is provided separately, the structure according to the circuit configuration is complicated, and there is a limit in reducing the size of the transmission / reception apparatus, thereby weakening the price competitiveness.

Accordingly, the present invention has been made to solve the above problems, and the mixer and the band to simplify the circuit configuration by alternately setting the transmission and reception path for transmitting and receiving data in a half-duplex two-way wireless communication by time division method It is an object of the present invention to provide a wireless communication transceiver for establishing a transmission / reception path by a pass filter.

In addition, the present invention provides a mixer and a bandpass filter so that when the transmission path is set, the mixer performs the transmission amplitude shift as a modulation function, and when the reception path is set, the intermediate frequency conversion function of the received data is performed. It is another object of the present invention to provide a method for amplitude shift modulation of a transmission frequency and a method for converting a reception frequency.

Wireless communication transceiver for transmitting and receiving path is set by the mixer and the band pass filter of the present invention for achieving the above object; A half-duplex two-way wireless communication transceiver in which transmission and reception are alternately performed by a time division method, comprising: a transmission / reception data separator for separating transmission data and a reception data signal applied from an antenna, transmission data separated by the transmission / reception data separator, and a high frequency wave. After mixing the local oscillation signal applied from the local oscillator, the amplitude shift modulation is performed on the transmission data, and then transmitted to the transmission path, while the received data input from the antenna is converted into an intermediate frequency signal together with the local oscillation signal and received. A mixer for transmitting the converted intermediate frequency signal through a path, a bandpass filter connected to the mixer to limit a band of the transmission data or removing unnecessary signals included in the received data, and alternately activating the transmission / reception path The first and second switches, said A high frequency amplifier which amplifies the transmission data when the transmission and reception paths are respectively activated in parallel between the first and second switches, a low noise amplifier which amplifies the reception data received by the antenna, and an intermediate frequency signal applied from the mixer A high pass filter, an amplifier, an intermediate frequency selective filter, and an amplitude shift demodulator are sequentially provided in the reception path so as to convert the data into the received data.

In addition, the amplitude shifting modulation and reception frequency conversion method of the transmission frequency using a wireless communication transceiver, the transmission and reception path is set by the mixer and the band pass filter of the present invention for achieving the above object; A method of processing transmission data and reception data by a half-duplex two-way radio communication apparatus in which transmission and reception are alternately performed by a time division method, wherein a high frequency signal is generated when only transmission path for transmission is activated. A process of mixing and modulating a mixer together with a local oscillation signal applied from a local oscillator, wherein the modulated signal is provided in a band-limited state in a bandpass filter, amplified through an active transmission path, and then radiated through an antenna. and; And when received data is applied through the antenna from only a reception path for reception, the frequency conversion is performed in the mixer together with a local oscillation signal applied from a high frequency local oscillator and demodulated in a form of received data according to amplitude shift demodulation. The process is done.

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

2 is a block diagram illustrating a wireless communication transceiver in which transmission and reception paths are alternately set by a mixer and a band pass filter according to a preferred embodiment of the present invention. FIG. 3 is a detailed circuit diagram of the transmission and reception data separator of FIG.

As shown in FIG. 2, a low pass filter 271 for passing low frequency components of the transmission data and a local oscillation signal from the high frequency local oscillator 200 are applied to the transmission data transmitted from the low pass filter 271. A mixer 211 for performing amplitude shift modulation for the first and second bands, a band pass filter 212 for limiting the band of the amplitude shift-modulated transmission data, and the band-limited transmission data for switching the first and second switches 220 and 240. When the transmission path is secured according to the transmission path unit consisting of a high-frequency amplifier 230 to amplify the power to radiate to the air via the antenna 250; The high frequency signal received from the antenna 250 is applied to the reception path secured according to the operation of the first and second switches 220 and 240 to be amplified by the low noise amplifier 260 and to remove unnecessary signals from the amplified signal. The mixer 211 receives the local oscillation signal from the high frequency local oscillator 200 to perform an intermediate frequency conversion function for the signal transmitted from the pass filter 212 and the band pass filter 212, and the mixer 211. A high pass filter 272 for passing high frequency components of the signal transmitted from the amplifier, an amplifier 281 for amplifying the signal transmitted from the high pass filter 272, and an intermediate frequency for filtering a desired channel signal among the amplified signals A selection path 282 and a reception path section comprising an amplitude shift demodulator 283 for demodulating the selected signal into a received data format.

The mixer 211 operates as an amplitude shift demodulator at the time of data transmission and as a frequency converter at the time of reception.

In addition, the low pass filter 271 and the high pass filter 272 is a transmission and reception data separator 270 which is installed in the transmission and reception path, respectively to separate the transmission and reception data.

The transmission / reception data separator 270 shows a low pass filter 271 for passing only a low frequency signal for transmission data, and a high pass for passing only a high frequency signal for the received data transmitted from the mixer 211, as shown in FIG. It can be represented by the detailed circuit of the filter 272.

As shown in FIG. 3, the low pass filter 271 and the high pass filter 272 are composed of a combination of L (Inductance) and C (Capacitance) which are typically used when designing the filter. The low pass filter 271 is composed of first and second inductances L1 and L2 and first to third capacitances C1, C2 and C3, and the high pass filter 272 has a fourth capacitance C4. ) And third and fourth inductances L3 and L4.

Next, the operation of the present invention will be described in detail with reference to FIGS.

First, since the wireless communication transceiver according to the present invention uses a half-duplex bidirectional communication method, the transmission time and the reception time are different from each other by the time division method, and the transmission and reception paths are alternated by the first and second switches 220 and 240. To be activated.

In this case, the transmission / reception path may maintain the whole of the other paths when one path is on.

First, when the transmission data is to be transmitted (ST100), the first and second switches 220 and 240 are operated by a controller (not shown) to transmit a transmission path from the band pass filter 212 toward the high frequency amplifier 230. Activate (ST102). At this time, the reception path is closed.

Thereafter, when the transmission data, that is, data consisting of '0' and '1' is transferred to the low pass filter 271, the low pass filter 271 passes only the low frequency component (ST102).

The signal output limited to the low frequency band from the low pass filter 271 is output to the mixer 211, and the mixer 211 receives the local oscillation signal from the high frequency local oscillator 200 and receives the local oscillation signal. The modulation process is performed by mixing them together (ST106).

The modulated transmission signal is output from the band pass filter 212 with a limited band and is passed through the first switch 220 to the high frequency amplifier 230. After being amplified by the high frequency amplifier 230, the power is passed through the second switch 240 to the antenna 250 and radiated to the air (ST108).

On the other hand, the high frequency signal processing received by the antenna is received as the received data through the reception path, it will be described.

First, in order to process the high frequency signal, the first and second switches 220 and 240 are operated by the controller to activate the reception paths from the low noise amplifier 260 toward the band pass filter 212 (ST110 and ST112). At this time, the transmission path transitions to the closed state.

When the reception path is activated, the high frequency signal received by the antenna 250 is amplified by the low noise amplifier 260 (ST114). That is, since the high frequency signal received at the RF receiver, which is an antenna, has a very low power level due to the attenuation and the influence of noise, an amplifier function that minimizes noise is performed.

When the low noise amplified received signal is transmitted to the mixer 211 through the band pass filter 212 through the first switch 220 (ST116), the mixer 211 is from the high frequency local oscillator 200. The local oscillation signal is received and converted into an intermediate frequency signal together with the local oscillation signal (ST118).

The converted intermediate frequency signal is transmitted to the high pass filter 272, and then only a specific band is selected and amplified by the amplifier 281, and a desired channel signal is selected by the intermediate frequency selective filter 283 so that an amplitude shift demodulator 283 is selected. Is delivered to).

Then, the amplitude shift demodulator 283 demodulates the received data format of '0' and '1' and outputs the demodulated data.

As described above, in the present invention, the mixer and the band pass filter connected thereto in the wireless communication device in which transmission and reception are alternately performed in accordance with the time division method are used for amplitude modulation of the transmission data into a high frequency signal and the reception time zone. By alternately performing the frequency conversion function for demodulating the received high frequency signal, it is possible to simplify the system configuration as compared to the circuit configuration in which the conventional transmission / reception path is separate, and the effect of minimizing the product size to which the system is provided. have.

On the other hand, the present invention is not limited to the specific preferred embodiment described above, and can be suitably used for half-duplex bidirectional short-range wireless communication employing a time division method, and thus the present invention can be made without departing from the gist of the present invention as claimed in the claims. Anyone with ordinary knowledge in the field will be able to implement various changes.

Claims (6)

In the half-duplex two-way radio communication transceiver in which transmission and reception are alternately performed by a time division method, Transmitting and receiving data separator for separating the transmission data and the received data signal applied from the antenna, The transmission data separated by the transmission / reception data separator and the local oscillation signal applied from the high frequency local oscillation unit are mixed to perform amplitude shift modulation on the transmission data, and then transfer the received data input from the antenna to the band pass filter. A mixer for converting the intermediate frequency signal with the local oscillation signal, and transferring the converted intermediate frequency signal to the transmission and reception data separator, A band pass filter connected to the mixer and limiting a band of the transmission data or removing unnecessary signals included in the received data; A first operation of alternately activating a reception path for transmitting the received data received from the antenna from the low noise amplifier to the bandpass filter and a transmission path from the bandpass filter to the high frequency amplifier and the antenna according to time division switching control; Second switch, A high frequency amplifier which amplifies the transmission data when the transmission and reception paths are respectively interposed in parallel between the first and second switches and the low noise amplifier which amplifies the reception data received by the antenna; Transmitting and receiving by a mixer and a band pass filter, characterized in that a high pass filter, an amplifier, an intermediate frequency selective filter, an amplitude shift demodulator are sequentially provided in the receiving path so as to convert an intermediate frequency signal applied from the mixer into a received data form. Wireless communication transceiver that route is established. The method of claim 1, The transmission and reception data separator, A low pass filter for passing only low frequency components of the transmission data; And a high pass filter configured to pass only a high frequency component among the received data applied from the antenna and output by the mixer, wherein the transmission and reception path is set by the mixer and the band pass filter. A method for processing transmission data and reception data by a half-duplex bidirectional wireless communication transceiver in which transmission and reception are alternately performed by a time division method, When transmission data is applied to the mixer while the transmission path is activated from the band pass filter to the antenna according to the operation of the first and second switches, the frequency is mixed and modulated in the mixer together with the local oscillation signal applied from the high frequency local oscillator. Modulation process, A transmission process in which the modulated signal is provided in a band limited state in a band pass filter, amplified through an activated transmission path, and then radiated through an antenna; And When receiving data is applied through the antenna in a state in which a reception path is activated in the band pass filter direction from the antenna according to the operation of the first and second switches, an intermediate frequency in the mixer together with a local oscillation signal applied from the high frequency local oscillator Is converted to, The received data converted to the intermediate frequency is amplified for the required frequency band, and the desired channel signal is selected and demodulated in the received data format according to the amplitude shift amplitude demodulation. A amplitude shifting modulation and a receiving frequency converting method using a wireless communication transceiver having a transmission and reception path set by a mixer and a band pass filter, characterized in that it is made. delete delete delete

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