JP2003338772A - Cdma mobile communication base station apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate transmission of high-level radio frequency band signals to a plurality of individual transmitting/receiving units, to avoid detrimental effects on the operation of each unit, and to decrease introduction level errors, by reducing the attenuation amount of a reference signal level at a reference signal introducing unit. <P>SOLUTION: A reference signal distributing unit 60 is provided for converting a baseband reference signal ref (BB) from a reference signal generator into a radio-frequency band reference signal ref (RF) and for supplying it to each individual transmitting/receiving unit 20. According to this arrangement, a frequency converter can be eliminated from a reference signal introducing unit of each individual transmitting/receiving unit 20, the level of the reference signal for the reference signal introducing unit can be lowered, the attenuation amount of a variable attenuator for level attenuation can be reduced, and errors in the reference signal introduction level for receiving system circuits are made small. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CDMA mobile communication base station apparatus, and more particularly to uniforming the amplitude characteristic and the phase characteristic of a receiving system circuit and a transmitting system circuit corresponding to each of a plurality of antenna elements of an array antenna. The present invention belongs to a CDMA mobile communication base station device that can secure good antenna directivity and enhance the communication interference reduction effect and the transmission power reduction effect.

[0002]

2. Description of the Related Art In a mobile communication such as a CDMA cellular system, when an adaptive array antenna is used for its base station, the adaptive array antenna has a weighting coefficient (weight) of each antenna element system circuit arranged in a plurality of arrays. By adaptively controlling the directional pattern in the uplink, the directional pattern having the directivity in the direction of arrival of the desired wave and the beam null in the direction of arrival of the interference wave is generated. The interference from the user is suppressed, and the signal can be received in a good signal-to-interference ratio (SIR) situation. In the downlink, by reusing the weights obtained in the uplink or estimating the arrival directions of the desired wave and the interference wave, a beam is formed in the desired user direction and a null beam is formed in the interference user direction. The formation has an advantage that a good signal-to-interference ratio can be maintained for each user.

As an example of such a conventional CDMA mobile communication base station apparatus, literature and Technical Report RCS2000-3.
1 (2000-06). 8 is a block diagram showing the overall configuration of a conventional CDMA mobile communication base station apparatus, FIG. 9 is a block diagram showing the configuration of an individual transmission / reception unit connected to each antenna element thereof, and FIG. 10 is the individual configuration shown in FIG. It is the block diagram which extracted the receiving system circuit part of a transmission / reception part. In the overall configuration shown in FIG. 8, the array antenna 10 has a plurality of antenna elements 11
A plurality of individual transmission / reception units 20x corresponding to and connected to the plurality of antenna elements 11 are provided, and directivity control is performed on transmission input signals and reception output signals of the individual transmission / reception units 20x. Weighting is performed by the element 31, and the antenna transmission directivity and the antenna reception directivity are obtained.

In the antenna directivity control section 30, M
It is connected to a weighting control circuit based on the MSE (Minimum Mean Square Error) method, and performs beamforming control on a transmission signal or a reception signal input to and output from each antenna. Here, since the weighting control is performed by the baseband signal processing, even if an attempt is made to send each antenna in the same phase and the same amplitude in the transmission signal due to the radio section between the baseband processing section and the antenna, If there is a variation in the phase and the amplitude in the associated transmission unit, the desired in-phase and same-amplitude signals are not transmitted from each antenna. Further, even at the time of reception, even if the signals are received by the respective antennas with the same phase and the same amplitude, the weighting control in the base band cannot be accurately performed if there is variation in the phase and the amplitude between the receiving units associated with the respective antennas. Therefore, in each individual transmission / reception unit 20x, the phases and amplitudes of the transmission signal and the reception signal associated with each antenna system are adjusted to be equal to each other.

In the block diagram shown in FIG. 9, a reference signal introducing section 25x, an error detector / holder 29r, and a receiver-side amplitude / phase controller 27 are a transmitter / receiver 23 and a variable gain receiver 26. Is a circuit for adjusting (calibrating) the amplitude and phase of the received signal passing through the transmission reference signal deriving unit 24, the reference signal introducing unit 25x, the error detector / holder 29t, and the transmitter side amplitude / phase controller 21.
And the calibrated reception system circuit are calibration circuits of amplitude and phase for a transmission signal passing through the transmitter 22 and the transmission / reception duplexer 23. In these calibrations for the reception signal and the transmission signal, the error detection and the control of the amplitude and the phase are performed by the reference signal ref (BB) in the baseband.
The introduction of the reference signal into the transmission / reception duplexer 23 and the receiver 26 needs to be converted into the frequency band of the reception signal from the antenna element 11, that is, the radio frequency band.

In this conventional CDMA mobile communication base station apparatus, as shown in FIGS. 8 to 10, if the signal of the reception radio frequency band fr from the local oscillator 40 is supplied to each individual transmission / reception section 20x, each of these individual transmission / reception sections 20x is obtained. The transmitter / receiver 20x has an advantage that the receiving system can be calibrated independently. In this case, the baseband reference signal ref
The reference signal introducing unit 25x, which converts (BB) into the reception radio frequency band fr and introduces it into the circuit of the reception system, includes the frequency converter 2
54, a switch S251 and an adder 251, for switching between transmission and reception and for introducing a reference signal of a transmission system, a variable attenuator 252 for controlling the introduction level, and a directional coupler 253. The reference level of the reference signal may be about -20 dB with respect to the received signal from the antenna element 11, and the received radio frequency band fr from the local oscillator 40.
The signal level of the variable attenuator 25 requires a relatively high level depending on the degree of the frequency converter 254.
The attenuation amount of 2 also becomes large.

[0007]

DISCLOSURE OF THE INVENTION The above-mentioned conventional CDM
In the mobile transceiver base station apparatus A, in the individual transmission / reception unit 20x connected to each of the plurality of antenna elements 11 of the array antenna 10, the amplitude and phase characteristics of the reception signal and the transmission signal are different between the plurality of individual transmission / reception units 20x. Adjustment (calibration) is performed so that they are equal. In this calibration operation, error detection and amplitude / phase control are performed in the reference signal ref (B
B), on the other hand, it is necessary to introduce the reference signal into the reception radio frequency band fr.
5x is a frequency converter 254 that converts a baseband reference signal ref (BB) into a reception radio frequency band fr, a switch S251 and an adder 251, for switching between transmission and reception, a variable attenuator 252 for controlling the introduction level, Directional coupler 2
53, and the reference signal introducing unit 25x.
In the above, the level of the reference signal to be introduced may be approximately -20 dB with respect to the received signal from the antenna element 11,
The signal level of the reception radio frequency band fr for frequency conversion from the local oscillator 40 requires a relatively high level depending on the type of the frequency converter 254. There is a risk that the operation of each part will be adversely affected if it is routed, and the variable attenuator 25
Since the attenuation amount of 2 also becomes large, there is a problem that the error of the reference signal introduction level due to the error of the attenuation amount becomes large and the accuracy of the calibration decreases.

In view of the above-mentioned problems of the prior art, the object of the present invention is not to route a high level received radio frequency band signal for reference signal frequency conversion to each individual transmission / reception unit, and To provide a CDMA mobile communication base station apparatus capable of eliminating the adverse effect on the operation of each part, reducing the amount of attenuation of a variable attenuator or the like, reducing the error of the reference signal introduction level, and improving the calibration accuracy. is there.

[0009]

A CDMA mobile communication base station apparatus according to the present invention is an array comprising a plurality of antenna elements.
A CDMA mobile communication base station apparatus capable of multiple access, which forms an antenna directivity for a plurality of mobile stations using an antenna and communicates with the plurality of mobile stations, which is correspondingly connected to the plurality of antenna elements. A plurality of individual transmission / reception units, and a reference signal supply means for supplying a reference signal in a radio frequency band and a reference signal in a baseband to the plurality of individual transmission / reception units, each of the plurality of individual transmission / reception units. (A) A receiver that amplifies a radio frequency band received signal from a corresponding antenna element of the array antenna and converts it into a baseband received information signal and outputs the signal (b) supplied from the reference signal supply means Before the reference signal introducing section (c) for setting and controlling the reference signal in the radio frequency band to a predetermined level and introducing it into the radio frequency band reception signal transmission line from the antenna element. The reference signal of the base band included in the output signal of the receiver, and the reference signal of the base band supplied from the reference signal supply means, detects the difference in amplitude and phase between the receiver A reception side amplitude / phase control section for controlling and outputting an amplitude and a phase with respect to an output signal (d) A reference signal component included in an output signal of the reception side amplitude / phase control section is supplied from the reference signal supply means. A reference signal remover for removing the reference signal in the baseband, wherein the reference signal supplying means generates a reference signal in the baseband based on (e) a clock signal and an initialization signal; One reference signal generator (f) Converts the baseband reference signal from the one reference signal generator into a reference signal in the same frequency band as the radio frequency band received signal from the antenna element. , Wherein the plurality of distribution to the individual receiving unit, and supplies, characterized in that it is configured to include a reference signal distributor.

Further, the reference signal supply wiring of the reference signal supply unit from the reference signal distribution unit to each of the plurality of individual transmission / reception units is arranged so as to have equal length and the same environmental condition. It has a structure, which is a structure.

In addition, the reference signal supply means has a structure in which the reference signal supply wiring of the radio frequency band from the reference signal distribution section to each of the plurality of individual transmission / reception sections is arranged with different lengths and different environmental conditions. In this case, if the amplitude and phase shifts remain even under the same environmental conditions of the same length, the offset amount setting correction unit that corrects the reference signal amplitude and phase shifts due to this difference, The configuration is provided in the reception side amplitude / phase control means.

Further, the reference signal supplying means in the CDMA mobile communication base station is supplied to one of the reference signal generators instead of the baseband reference signals supplied to the plurality of individual transceivers. A clock signal and an initialization signal are supplied to the plurality of individual transceivers,
Each of the plurality of individual transmitter / receivers is provided with an individual reference signal generator that generates a baseband reference signal based on the clock signal and the initialization signal. A baseband reference signal is supplied to the phase control means and the reference signal remover.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The first embodiment of the present invention uses an array antenna composed of a plurality of antenna elements,
A CDMA mobile communication base station apparatus capable of multiple access, which forms an antenna directivity for a plurality of mobile stations and communicates with the plurality of mobile stations, wherein a plurality of individual transmission / reception units correspondingly connected to the plurality of antenna elements are provided. And a reference signal supply means for supplying a reference signal in a radio frequency band and a reference signal in a baseband to the plurality of individual transceivers, each of the plurality of individual transceivers having the array
A receiver for amplifying a radio frequency band received signal from a corresponding antenna element of an antenna and converting it to a base band received information signal for output, and a radio frequency band reference signal supplied from the reference signal supply means. , A reference signal introduction unit for setting and controlling to a predetermined level and introducing it into the radio frequency band reception signal transmission line from the antenna element, and the reference signal of the base band included in the output signal of the receiver. When,
Amplitude and phase control on the receiving side for detecting the difference in amplitude and phase between the reference signal of the baseband supplied from the reference signal supply means and controlling and outputting the amplitude and phase of the output signal of the receiver. And a reference signal remover that removes the reference signal component contained in the output signal of the receiving-side amplitude / phase control unit by the reference signal in the baseband band supplied from the reference signal supply means. The reference signal supply means is configured to generate a reference signal in a baseband based on a clock signal and an initialization signal, and a reference signal generator from the one reference signal generator. The reference signal of the reference signal is converted into a reference signal of the same frequency band as the reception signal of the radio frequency band from the antenna element, and distributed and supplied to the plurality of individual transmission / reception units. Nde constructed.

With such a configuration, it is not necessary to circulate a high-level reception radio frequency band signal for reference signal frequency conversion to a plurality of individual transmission / reception units, and thus the operation of each unit by this signal is performed. It is possible to eliminate the adverse effect on the reference signal, and also to reduce the level of the reference signal in the radio frequency band to the reference signal introducing section and the attenuation amount of the variable attenuator. Error can be reduced and calibration accuracy can be improved.

The second embodiment of the present invention is the above CD.
In the MA mobile communication base station, a reference signal supplying means supplies a clock signal and an initialization signal to one reference signal generating section instead of the reference signal in the baseband band, which is supplied to the plurality of individual transmitting / receiving sections. Are supplied to the plurality of individual transmission / reception units, and the plurality of individual transmission / reception units are provided with individual reference signal generators for generating reference signals in the baseband based on the clock signal and the initialization signal. The individual reference signal generator supplies the reference signal in the baseband to the reception side amplitude / phase control means and the reference signal remover.

As in the first embodiment, when it is attempted to generate a reference signal in the baseband to the reference signal distribution section and the plurality of individual transmission / reception sections with one reference signal generation section, this one reference signal is generated. Since it is necessary to increase the output power of the generation unit, the configuration of this one reference signal generation unit and the control of the output power become somewhat difficult by that amount. By providing the reference signal generator, the output power of one reference signal generator can be reduced, and the configuration and the output power can be easily controlled. Other functions and effects are similar to those of the first embodiment.

[0017]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing the entire CDMA mobile communication base station apparatus of the first embodiment of the present invention, FIG. 2 is a block diagram of its individual transmission / reception unit, and FIG. 3 is a block in which a reception system circuit portion of the individual transmission / reception unit is extracted. It is a figure. The first embodiment is different from the conventional CDMA mobile communication base station apparatus shown in FIGS. 8 to 10, firstly, in this conventional example, reference signals to a plurality of individual transmission / reception units 20x are transmitted. Whereas the supply is only the baseband reference signal ref (BB), in the first embodiment, a plurality of individual transmission / reception units 20 are provided.
Supply of the reference signal to the reference signal ref of the radio frequency band
Both (RF) and the reference signal ref (BB) in the baseband are generated. Secondly, in order to have such a configuration, in the conventional example, a reference signal generator (not shown) is generated. While the baseband reference signal ref (BB) is directly supplied to each individual transmitting / receiving unit 20x, in the first embodiment, the reference of the baseband generated by one reference signal generator 50 is performed. The signal ref (BB) is supplied to each individual transmission / reception unit 20, and at the same time, the reference signal ref (BB) in the baseband is converted into a radio frequency band (by the frequency converter 61) to generate the radio frequency. A reference signal distribution unit 60 that distributes (by a distributor 62) the reference signal ref (RF) of the band to each individual transmission / reception unit 20 is provided. Thirdly, in the conventional individual transmission / reception unit 20x, Reference signal In the input section 25x, the reference signal ref (BB) in the base band is converted into the reference signal in the radio frequency band (fr) by the frequency converter 254, the level is set by the variable attenuator 252x, and the reference signal ref (BB) is introduced into the receiving system circuit. On the other hand, in the individual transmission / reception unit 20 of the first embodiment, the reference signal introduction unit 25 of the individual transmission / reception unit 20 sets the level of the supplied reference signal ref (RF) in the radio frequency band as it is in the variable attenuator 252. , Has been introduced to the receiving circuit,
There is a point. In addition, one reference signal generator 50,
A reference signal supply unit (not shown) is formed by the reference signal distribution unit 60.

With such a configuration, in the conventional example, depending on the type of the frequency converter 254, a signal of a radio frequency band (fr) of a relatively high level is routed to each individual transmitting / receiving section 20x, This may adversely affect the operation of each part, but in the first embodiment, there is no need for frequency conversion, and the reference signal introduction level may be about -20 dB with respect to the received signal level, so that each individual transmitter / receiver part. Reference signal ref of the radio frequency band supplied to 20
The level of (RF) can be significantly reduced as compared with the case of the conventional example, and the adverse effect on the operation of each part can be eliminated.

Further, in the conventional example, the level of the output signal of the frequency converter 254 is also high, and the variable attenuator 25 can be used to attenuate this signal to about -20 dB with respect to the received signal level.
The 2x attenuation amount also increases, and the error in the reference signal introduction level to the receiving system circuit also increases due to the error in the attenuation amount, which lowers the calibration accuracy. However, in the first embodiment, it is variable. Since the input signal level to the attenuator 252 is small, the amount of attenuation of the variable attenuator 252 can be made significantly smaller than that of the conventional example, and the error in the introduction level of the reference signal to the receiving system circuit can be reduced. It is possible to improve the calibration accuracy.

In the first embodiment, the wiring for supplying the reference signal ref (RF) in the radio frequency band from the reference signal distributor 60 to each individual transceiver 20 has the same length and the same environmental condition. Are arranged as described above to reduce the difference in wiring length and the difference in external fluctuation such as thermal expansion and contraction with respect to the wiring, and the reference signal ref (R
It is desirable to make the amplitude and phase of F) uniform.

FIG. 4 shows a second embodiment of the present invention, CDMA.
FIG. 5 is a block diagram of the entire mobile communication base station apparatus, and FIG. 5 is a block diagram in which a reception system circuit portion of the individual transmission / reception unit is extracted. In the above-described first embodiment, the reference signal ref (BB) in the baseband is directly supplied to the individual transmitting / receiving section 20 from one reference signal generator 50, but in the second embodiment, the reference signal ref (BB) is supplied. , The clock signal CLK and the initialization signal INS, which are the bases for generating the reference signal ref (BB) in the baseband in the single reference signal generator 50a, are supplied to the individual transceivers 20a.
0a indicates the clock signal CLK and the initialization signal INS.
The reference signal generator 51 for generating the reference signal ref (BB) in the base band based on the above is provided.

As in the first embodiment, a single reference signal generator 50 is used to transmit a reference signal ref (B) to the reference signal distributor 60 and a plurality of individual transceivers 20 in the base band.
If B) is to be generated, the output power becomes large, and it tends to be difficult to control the configuration of the reference signal generator 50 and the output power. However, as in the second embodiment,
One reference signal generator 50a is configured to generate the reference signal ref (BB) in the base band to only the reference signal distributor 60, and by providing the individual reference signal generator 51 in each individual transmission / reception unit 20a, One reference signal generator 5
It is possible to reduce the output power of 0a, its configuration,
Also, the control of the output power can be facilitated, and the formation of the individual reference signal generator 51 is also simple. Other configurations, operational effects, and the like are similar to those of the first embodiment.

FIG. 6 is a block diagram of a receiving system circuit portion of an individual transmitting / receiving section showing a third embodiment of the present invention. In the above-described first and second embodiments, the wiring of the reference signal ref (RF) in the radio frequency band from the reference signal distribution unit 60 to each individual transmission / reception unit 20, 20a is made to have the same length and the same environmental condition. Although it is desirable to arrange them in such a manner, it may not be possible to arrange in that way due to structural reasons. In such a case, the receiving-side amplitude / phase control means including the error detecting / holding unit 29r and the receiving-side amplitude / phase controller 27 is arranged so as to correct the difference between the amplitude and the phase caused by the arrangement. , The offset amount setting corrector 71 is used as the error detecting / holding device 2.
It is good to provide for 9r. Also, as shown in FIG.
An offset amount setting controller 72 may be provided for the receiving side amplitude / phase controller 27.

[0024]

As described above, according to the present invention, the reference signal in the base band from one reference signal generating section is converted into the reference signal in the radio frequency band and distributed and supplied to the plurality of individual transmitting / receiving sections. Reference signal supply means is provided, and in each individual transmission / reception section, in the reference signal introduction section, the reference signal in the radio frequency band from the reference signal supply means is directly set to the level,
The reference signal in the baseband band, which serves as a reference for amplitude and phase in the receiving-side amplitude / phase control means, is supplied from one reference signal generator or By providing an individual reference signal generator for generating a reference signal in the baseband in the individual transmission / reception unit and supplying from this individual reference signal generator, the reference signal introduction unit of each individual transmission / reception unit , Since there is no frequency converter that requires a high level signal and it is not necessary to circulate a high level reception radio frequency band signal, it is possible to eliminate adverse effects on the operation of each part,
Since the amount of attenuation with respect to the reference signal in the reference signal introduction unit can be small, it is possible to reduce the error in the introduction level of the reference signal due to this amount of attenuation and to improve the calibration accuracy. .

[Brief description of drawings]

FIG. 1 is a block diagram of an entire CDMA mobile communication base station apparatus showing a first embodiment of the present invention.

FIG. 2 is a block diagram of each individual transmission / reception unit in the first embodiment shown in FIG.

FIG. 3 is a block diagram in which a reception system circuit portion of the individual transmission / reception unit shown in FIG. 2 is extracted.

FIG. 4 is a block diagram of an entire CDMA mobile communication base station apparatus showing a second embodiment of the present invention.

FIG. 5 is a block diagram in which a reception system circuit portion of each individual transmission / reception unit in the second embodiment shown in FIG. 4 is extracted.

FIG. 6 is a block diagram in which a reception system circuit portion of each individual transmission / reception unit in the third embodiment of the present invention is extracted.

FIG. 7 is a block diagram showing a modification of the third embodiment shown in FIG.

FIG. 8 is a block diagram of an entire apparatus showing an example of a conventional CDMA mobile communication base station apparatus.

9 is a block diagram of each individual transmission / reception unit of the conventional example shown in FIG.

10 is a block diagram in which a reception system circuit portion of the individual transmission / reception unit shown in FIG. 9 is extracted.

[Explanation of symbols]

10 array antenna 11 Antenna element 20, 20a, 20b, 20c, 20x Individual transmitter / receiver 21 Transmitter side amplitude / phase controller 22 transmitter 23 Transmitter / receiver 24 Transmission Reference Signal Derivation Unit 25,25x reference signal introduction part 26 receiver 27 Receiver side amplitude / phase controller 28 Reference signal remover 29r, 29t Error detector / holder 30 Antenna directivity controller 31 Directional control element 40 local oscillator 50 reference signal generator 50a reference signal generator 51 Reference signal generator 60 reference signal distributor 61 Frequency / Transducer 62 distributor 71 Offset amount setting controller 72 Offset amount setting controller 241 frequency converter 242 Variable attenuator 243 directional coupler 251 adder 252 Variable attenuator 253 directional coupler 254 frequency converter 281 adder

Claims (4)

[Claims] 1. A CDMA mobile communication base station apparatus capable of multiple access, which uses an array antenna comprising a plurality of antenna elements to form antenna directivity for a plurality of mobile stations and communicates with the plurality of mobile stations. A plurality of individual transmission / reception units correspondingly connected to the plurality of antenna elements,
And a reference signal supply means for supplying a reference signal in a radio frequency band and a reference signal in a base band to the plurality of individual transmission / reception units, each of the plurality of individual transmission / reception units (a) the array antenna A receiver for amplifying a received signal in the radio frequency band from the corresponding antenna element and converting it into a received information signal in the base band and outputting it (b) a reference signal in the radio frequency band supplied from the reference signal supply means Is set to a predetermined level and is controlled to be introduced into the radio frequency band reception signal transmission line from the antenna element. (C) Reference of the base band included in the output signal of the receiver. A difference between the signal and the reference signal in the baseband supplied from the reference signal supply means is detected to control the amplitude and phase of the output signal of the receiver. Amplitude receiving side amplitude / phase control section (d) A reference signal component contained in the output signal of the receiving side amplitude / phase control section is removed by the reference signal of the base band supplied from the reference signal supplying means. And a reference signal removing unit, wherein the reference signal supply unit generates (e) a reference signal in a baseband based on a clock signal and an initialization signal. A reference signal in the baseband from one reference signal generation unit is converted into a reference signal in the same frequency band as the received signal in the radio frequency band from the antenna element, and distributed and supplied to the plurality of individual transmission / reception units. And a CDMA mobile communication base station apparatus comprising a reference signal distribution unit. 2. The reference signal supply wiring of the reference signal supply unit from the reference signal distribution unit to each of the plurality of individual transmission / reception units is arranged so as to have equal length and the same environmental condition. The CDMA mobile communication base station apparatus according to claim 1, which is a structure. 3. The structure for arranging the reference signal supply wiring of the reference signal supply unit of the radio frequency band from the reference signal distribution unit to each of the plurality of individual transmission / reception units under different lengths and different environmental conditions. In the case where the amplitude and phase shifts remain even under the same environmental conditions of the same length,
2. The CD according to claim 1, wherein an offset amount setting correction unit for correcting the deviation of the amplitude and phase of the reference signal due to this difference is provided in the reception side amplitude / phase control means.
MA mobile communication base station device. 4. The CDMA according to any one of claims 1 to 3.
In the mobile communication base station, the reference signal supply means supplies the clock signal and the initialization signal supplied to the one reference signal generation unit, instead of the baseband reference signal supplied to the plurality of individual transmission / reception units. It supplies to these plural individual transmitting / receiving sections, and to these plural individual transmitting / receiving sections,
An individual reference signal generator that generates a reference signal in a baseband based on the clock signal and the initialization signal is provided, and the receiving side amplitude / phase control means and the reference signal remover are provided from the individual reference signal generator. A CDMA mobile communication base station device adapted to supply a reference signal of a baseband band to the.