KR200227899Y1 - Apparatus for separating multi frequency allocation using CQPSK/QPSK modulator/demodulator - Google Patents

Abstract

The present invention relates to a multiple frequency allocation (FA) separation device using a complex quadrature phase shift keying (CQPSK) / QPSK modulator, and more specifically, cellular, PCS, IS configured in a mobile communication system such as CDMA and W-CDMA The present invention relates to a multi-FA separation device that can be used without loss of information when only one FA of one of -95C, IMT-2000, WLL, etc. is to be used.

A feature of the present invention is an apparatus for extracting only one FA selected from multiple FAs according to a center frequency, the apparatus comprising: a first mixer for mixing a multiple FA signal and a local signal transmitted through an input terminal; A primary PLL for processing a predetermined signal supplied to the first mixer; A first amplifier for amplifying the predetermined signal output from the primary PLL; A second amplifier for amplifying the IF signal output from the first mixer; A CQPSK / QPSK demodulator for demodulating the signal amplified by the second amplifier; A BRF for separating the base band I. Q channels of the predetermined band signal demodulated by the CQPSK / QPSK demodulator, respectively, and primary separation of adjacent FAs around the selected FA in each channel; A CQPSK / QPSK modulator that receives the I and Q signals output from the BRF and modulates them to an output terminal; A secondary PLL for supplying the predetermined signal of the CQPSK / QPSK demodulator and the CQPSK / QPSK modulator; A third amplifier for amplifying the signal output from the secondary PLL; A power divider for delivering in-phase equal amplitude power to the CQPSK / QPSK demodulator and the CQPSK / QPSK modulator, respectively; A surface acoustic wave filter for receiving a signal output through the CQPSK / QPSK modulator to improve system delay and cutoff performance; A fourth amplifier for amplifying the signal output from the surface acoustic wave filter; A second mixer for outputting the IF signal and the RF signal amplified by the fourth amplifier; A tertiary PLL for processing the predetermined signal supplied to the second mixer; And a fifth amplifier amplifying the signal output from the third PLL and sending the signal to the second mixer.

As such, the present invention can select only the desired FA among the inputted multiple FAs while minimizing the delay of the system, and the separated FA signal has excellent spurious characteristics without loss of information through modulation / demodulation and filtering processes. Therefore, there is an advantage that can maintain the formal spectral characteristics.

Description

Apparatus for separating multi frequency allocation using CQPSK / QPSK modulator / demodulator}

The present invention relates to a multiple frequency allocation (FA) separation device using a complex quadrature phase shift keying (CQPSK) / QPSK modulator, and more specifically, cellular, PCS, IS configured in a mobile communication system such as CDMA and W-CDMA The present invention relates to a multiple FA separation device that can be used without loss of information when only one independent FA of -95C, IMT-2000, WLL, etc. is to be used.

In general, a mobile communication system such as CDMA causes a difference in the number of FAs used between a base station and a suburban area or a suburban area due to an increase in the number of subscribers due to an increase in subscribers. In order to induce a smooth handoff between the FA base station cell and the downtown small FA base station cell, a pilot beacon scheme, which is a frequency scheme providing only a pilot channel without a traffic channel, is used. IS-95C-based hard handoff is a method in which the mobile station transitions and the traffic channel is temporarily disconnected when the frame offset changes in the same active CDMA FA or a disconnected active set. In order to extract only one FA from the IF frequency band processed in the CDMA system thus processed, the surface acoustic wave filter filter having excellent filtering is used. However, surface acoustic wave filter filters have a disadvantage of having a long delay. It is not suitable to apply to the system, and when using a low pass filter (LPF), it is not efficient because the accurate separation between FAs is difficult and the information resilience of the signal and the system delay time are long.

Accordingly, the present invention is to solve such a problem, the present invention is to use a multiple FA separation device using a CQPSK / QPSK modulator that can be extracted and applied only one FA of the desired when using multiple FA in the CDMA system The purpose is to provide.

Another object of the present invention is to provide a multiple FA separation device using a CQPSK / QPSK modulator that minimizes system delay without interfering with adjacent channels and provides a typical FA having a good spurless property among multiple FAs. To provide.

1 is a block diagram of a multiple FA separation apparatus using a CQPSK / QPSK modulator according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100: 1st mixer 110: 1st PLL

120: first amplifier 130: second amplifier

140: CQPSK / QPSK demodulator 150: BRF

160: CQPSK / QPSK Modulator 170: 2nd PLL

180: third amplifier 190: power divider

200: surface acoustic wave filter 210: fourth amplifier

220: 3rd PLL 230: 5th amplifier

240: second mixer

A feature of the present invention for achieving the above object, the apparatus for extracting only one FA selected from the multiple FA in accordance with the center frequency, the apparatus comprising: a first mixer for mixing the multi-FA signal and the local signal transmitted through the input stage; A primary PLL for processing a predetermined signal supplied to the first mixer; A first amplifier for amplifying the predetermined signal output from the primary PLL; A second amplifier for amplifying the IF signal output from the first mixer; A CQPSK / QPSK demodulator for demodulating the signal amplified by the second amplifier; A BRF for separating the base band I. Q channels of the predetermined band signal demodulated by the CQPSK / QPSK demodulator, respectively, and primary separation of adjacent FAs around the selected FA in each channel; A CQPSK / QPSK modulator that receives the I and Q signals output from the BRF and modulates them to an output terminal; A secondary PLL for supplying the predetermined signal of the CQPSK / QPSK demodulator and the CQPSK / QPSK modulator; A third amplifier for amplifying the signal output from the secondary PLL; A power divider for delivering in-phase equal amplitude power to the CQPSK / QPSK demodulator and the CQPSK / QPSK modulator, respectively; A surface acoustic wave filter for receiving a signal output through the CQPSK / QPSK modulator to improve system delay and cutoff performance; A fourth amplifier for amplifying the signal output from the surface acoustic wave filter; A second mixer for outputting the IF signal and the RF signal amplified by the fourth amplifier; A tertiary PLL for processing the predetermined signal supplied to the second mixer; And a fifth amplifier amplifying the signal output from the third PLL and sending the signal to the second mixer.

Preferably, the predetermined signal is characterized in that the L.O signal.

Preferably, the BRF is characterized in that the filter having a base band band.

Preferably, the power splitter is a two-way power splitter.

Preferably, the multi-FA signal input to the first mixer is characterized in that the carrier-specific FA and at least one FA, such as the band used in cellular, PCS, IS-95C, IMT-2000, WLL.

Preferably, the CQPSK / QPSK demodulator for demodulating the signal output through the first mixer is used in the IF band.

Preferably, the I and Q signals separated by the CQPSK / QPSK demodulator are signals having a base band width.

Preferably, the BRF which firstly separates only the FA selected from the multiple FAs applied to each base band I and Q channels separated by the CQPSK / QPSK demodulator is used.

Preferably, the BRF comprises a first BRF and a second BRF for separating the base band I and Q channels, respectively.

Preferably, the CQPSK / QPSK modulator receiving the I and Q signals from the BRF and modulating the I and Q signals to the output terminal is used in an IF frequency band.

Preferably, the CQPSK / QPSK demodulator and the CQPSK / QPSK demodulator are characterized by processing a signal through the power divider for delivering the power of the secondary PLL and in-phase equal amplitude for the supply of the predetermined signal.

Preferably, the signal is processed using the surface acoustic wave filter in the IF band to improve the system delay and cutoff performance of receiving the signal output through the CQPSK / QPSK modulator.

Preferably, the fourth amplifier amplifies the signal output from the surface acoustic wave filter and the predetermined mixer supplied to the second mixer and the second mixer for outputting the IF signal and the RF signal amplified by the fourth amplifier. The third order PLL is used to process a signal.

Preferably, the RF signal is characterized in that the final RF signal desired by the user.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are denoted by the same reference numerals as much as possible even if displayed on the other drawings.

1 is a block diagram of a multiple FA separation apparatus using a CQPSK / QPSK modulator according to the present invention.

In FIG. 1, the present invention includes a first mixer 100, a primary PLL 110, a first amplifier 120, a second amplifier 130, a CQPSK / QPSK demodulator 140, and a first BRF 151. Band Reject Filter (BRF) 150 consisting of second BRF 152, CQPSK / QPSK modulator 160, secondary PLL 170, third amplifier 180, power divider 190, surface acoustic wave filter 200 ), A fourth amplifier 210, a third PLL 220, a fifth amplifier 230, and a second mixer 240.

In order to extract only one FA selected from the multiple FAs according to the center frequency, the first mixer 100 mixes the multiple FA signals and the local signals transmitted through the input terminal IN, and the primary PLL 110 generates the first FA. The LO signal supplied to the mixer 100 is processed. In this case, the multi-FA signal input to the first mixer 100 includes at least one FA, such as the carrier-specific FA, the band used in the cellular, PCS, IS-95C, IMT-2000, WLL. The first amplifier 120 amplifies the L.O signal output from the primary PLL 110 and sends it to the first mixer 100.

The CQPSK / QPSK demodulator 140 used in the IF band demodulates the signal amplified by the second amplifier 130, which amplifies the signal output from the first mixer 100, and separates it into I and Q channels in the base band. The separated I and Q signals are signals having a base band width. The BRF 150 separates the baseband I. Q channel of the LO band signal demodulated by the CQPSK / QPSK demodulator 140 in the first BRF 151 and the second BRF 152, respectively, and separates the respective base bands I, Only the first FA among the multiple FAs applied to the Q channel is firstly separated, and in order to obtain a signal of a frequency band desired by the user, the first PLL 110 of the corresponding frequency band is used, and the first mixer 100 is used. The first amplifier 120 and the second amplifier 130 are used to optimally match the level of.

Meanwhile, the CQPSK / QPSK modulator 160 used in the IF frequency band receives the I and Q signals output from the BRF 150 and modulates them to the output terminal OUT. At this time, the secondary PLL 170 transmits the phase-processed signal to the third amplifier 180 to supply the L.O signals of the CQPSK / QPSK demodulator 140 and the CQPSK / QPSK modulator 160. The third amplifier 180 amplifies the phase-processed signal transmitted from the secondary PLL 170 and sends it to the power distributor 190.

The power divider 190 outputting in two directions delivers power having the same amplitude in phase to the CQPSK / QPSK demodulator 140 and the CQPSK / QPSK modulator 160, respectively. The surface acoustic wave filter 200 processed in the IF band receives the signal output through the CQPSK / QPSK modulator 160 and improves the system delay and cutoff performance and transmits it to the fourth amplifier 210. The fourth amplifier 210 amplifies the signal output from the surface acoustic wave filter 200, obtains one independent FA signal having excellent spurious characteristics, and transmits the independent FA signal to the second mixer 240. The second mixer 240 outputs the IF signal amplified by the fourth amplifier 210 and the final RF signal to be used by the user to the output terminal OUT. At this time, the third PLL 220 receives the RF signal and controls the phase, and the fifth amplifier 230 amplifies the signal output from the third PLL 220.

As described above, 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 embodiments described, but should be defined by the utility model registration claims as described below and equivalents to the utility model registration claims.

As a result, according to the multiple FA separation apparatus using the CQPSK / QPSK modulator according to the present invention the following advantages occur.

That is, it is possible to select only the desired FA among the inputted multiple FAs while minimizing the delay of the system, and the single separated FA signal has excellent spurious characteristics without loss of information through modulation / demodulation and filtering processes. Can maintain the characteristics.

Claims (14)

In a device that extracts only one FA selected from multiple FAs according to the center frequency, A first mixer for mixing multiple FA signals and local signals transmitted through an input terminal; A primary PLL for processing a predetermined signal supplied to the first mixer; A first amplifier for amplifying the predetermined signal output from the primary PLL; A second amplifier for amplifying the IF signal output from the first mixer; A CQPSK / QPSK demodulator for demodulating the signal amplified by the second amplifier; A BRF for separating the base bands I. Q channels of the predetermined band signal demodulated by the QPSK demodulator, respectively, and primarily separating adjacent FAs around the FA selected for each channel; A CQPSK / QPSK modulator that receives the I and Q signals output from the BRF and modulates them to an output terminal; A secondary PLL for supplying the predetermined signal of the CQPSK / QPSK demodulator and the CQPSK / QPSK modulator; A third amplifier for amplifying the signal output from the secondary PLL; A power divider for delivering in-phase equal amplitude power to the CQPSK / QPSK demodulator and the CQPSK / QPSK modulator, respectively; A surface acoustic wave filter for receiving a signal output through the CQPSK / QPSK modulator to improve system delay and cutoff performance; A fourth amplifier for amplifying the signal output from the surface acoustic wave filter; A second mixer for outputting the IF signal and the RF signal amplified by the fourth amplifier; A tertiary PLL for processing the predetermined signal supplied to the second mixer; And And a fifth amplifier configured to amplify the signal output from the third PLL and send the signal to the second mixer. The method of claim 1, wherein the predetermined signal is Multiple FA separation device using CQPSK / QPSK modulator, characterized in that the L.O signal. The method of claim 1 wherein the BRF is Multiple FA separation apparatus using a CQPSK / QPSK modulator, characterized in that the filter having a baseband band. The power splitter of claim 1, wherein the power divider is Multiple FA separator using CQPSK / QPSK modulator, characterized in that the two-way power divider. The method of claim 1, The multi-FA signal input to the first mixer is a CQPSK / QPSK modulator characterized in that the carrier-specific FA and at least one FA, such as bands used in cellular, PCS, IS-95C, IMT-2000, WLL Multiple FA Separators Used. The method of claim 1, And a CQPSK / QPSK demodulator for demodulating the signal output through the first mixer, wherein the CQPSK / QPSK demodulator is used in the IF band. The method of claim 1, The I, Q signal separated from the CQPSK / QPSK demodulator is a multiple FA separation apparatus using a CQPSK / QPSK demodulator, characterized in that the signal having a base band width. The method of claim 1, Multiple BR separation apparatus using a CQPSK / QPSK demodulator characterized in that the BRF is used to first separate only the FA selected from among the multiple FA applied to each base band I, Q channel separated in the CQPSK / QPSK demodulator. The method of claim 1 wherein the BRF is Multiple FA separation apparatus using a CQPSK / QPSK modulator, characterized in that consisting of the first BRF and the second BRF for separating the base band I, Q channels, respectively. The method of claim 1, The CQPSK / QPSK modulator using the CQPSK / QPSK modulator, characterized in that the CQPSK / QPSK modulator receives the I, Q signal from the BRF and modulates it to the output stage. The method of claim 1, CQPSK / QPSK demodulation, characterized in that for processing the signal through the power divider for delivering the power of the second PLL and in-phase equal amplitude for the supply of the predetermined signal of the CQPSK / QPSK demodulator and the CQPSK / QPSK modulator. FA separation device using a machine. The method of claim 1, Multiple FA separation apparatus using a CQPSK / QPSK modulator, characterized in that for processing the signal using the surface acoustic wave filter of the IF band to improve the system delay and cut-off performance that receives the signal output through the CQPSK / QPSK modulator. The method of claim 1, A fourth amplifier for amplifying a signal output from the surface acoustic wave filter and the predetermined signal supplied to the second mixer and the second mixer for outputting the IF signal and the RF signal amplified by the fourth amplifier; Multiple FA separation apparatus using a CQPSK / QPSK modulator, characterized in that to use the third PLL. The method of claim 1, wherein the RF signal is Multiple FA separation device using CQPSK / QPSK modulator, characterized in that the final RF signal desired by the user.