JP2000151487A - Radio base station system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio base station system adopting a time division duplex method where transmission quality and an interference characteristic for an outgoing channel is improved with prescribed transmission power without increasing the transmission power. SOLUTION: A memory 63 stores a phase difference of an adaptive synthesis weight between branches obtained by a phase difference detector 61 in the case of reception by an adaptive array diversity receiver. Dispersion in phases between branches of a transmission reception circuit is corrected by an adder 66 through an inverted sign in the case of transmission to set a state of a phase shifter 10. Transmission signals whose phase is controlled by the phase shifter 10 so that phases of the signals received by mobile stations are in phase are amplified by power amplifiers 11 whose output is constant and the amplified signals are transmitted. Through the configuration above, reception electric field strength in each mobile station is enhanced in an outgoing channel and interference onto a mobile station connecting to other base station being an interference source at reception can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a radio base station apparatus for communicating with a mobile terminal (mobile station).

[0002]

2. Description of the Related Art In recent years, the spread and digitization of public mobile communications represented by cellular phones and personal handy phones have been rapidly progressing. As a standard of a radio section of a mobile radio communication system that performs communication via a base station, for example, a standard relating to a personal handyphone (PHS) is specified in a standard RCRSTD-28 of the Association of Radio Industries and Businesses. In the personal handyphone (PHS), a radio wave from the base station to the mobile station (hereinafter, referred to as “down”) and a radio wave from the mobile station to the base station (hereinafter, referred to as “up”) are time-divided at the same frequency. Communication is performed by time division duplex (TDD).

[0003] In mobile communication, fading generally occurs, and the transmission quality, that is, the bit error rate characteristic is greatly deteriorated. As a method of compensating for deterioration of transmission quality due to fading, diversity reception is generally used.

[0004] However, diversity receivers that perform diversity reception are often used in base stations because of their complex structure, but are not preferred for use in terminal devices that require small size and low power consumption. As a method for solving this problem, there is transmission selection diversity.

[0005] Transmission selection diversity is transmission in a TDD radio system using a diversity branch (antenna) having the best reception quality at the time of reception immediately before transmission. Therefore, diversity reception is performed at the base station,
In addition, if transmission selection diversity is performed, the effect of fading can be reduced for both the upper and lower lines without performing diversity at the mobile station. In particular, when fading such that the mobile station moves at about the walking speed is slow, the effect of the transmission selection diversity is equivalent to the effect of diversity reception by selective combining.

In the public base station of the PHS system,
As described in detail in Ogawa and Kobayashi, edited by the Telecommunication Association, the third edition of "Easy Personal Handy Phone", a radio circuit is designed on the premise that a base station performs diversity reception and transmission selection diversity.

[0007] As a branch combining method in diversity reception, there are selective combining, equal gain combining, maximum ratio combining, and the like, and the maximum ratio combining is the most effective. Further, adaptive array diversity, which is found in literatures (Tanaka et al., "Characteristics of Decision Feedback Coherent Adaptive Diversity in DS-CDMA", IEICE Technical Report RCS 96-102, November 1996) is also being studied. Adaptive array diversity improves the co-channel interference characteristics of maximum ratio combining, and adaptively controls the combining weights so that the interference wave components included in the received signal cancel each other as much as possible and the desired wave components are strengthened. Is what you do.

The adaptive array diversity and the maximum ratio combining diversity are described, for example, in the literature (Kondo “TDMA
As described in "Transmission Diversity Characteristic in / TDD Communication System", IEICE Autumn Meeting B-355), application to transmission is also possible. That is, the transmission signal of each branch may be weighted and phase-controlled according to the weight and phase difference of each branch set at the time of reception, and then transmitted. Although the above-mentioned literature examines the application effect by computer simulation, it does not show the detailed configuration of the apparatus.

In order to realize such a base station apparatus having the maximum transmission ratio combining diversity, it is necessary to control the phase and amplitude of a transmission signal for each branch. If these phase and amplitude controls are performed between the output of the final-stage power amplifier and the antenna, a single transmission circuit may be used similarly to transmission selection diversity.

However, in order to continuously control such phase and amplitude, a configuration using a variable resistor and a reactance element, for example, a PIN diode or the like is used, and power loss is large. Therefore, in general, at least the last-stage power amplifier in the transmission circuit needs to be provided in plural for each branch. That is, it is necessary to perform the phase / amplitude control in a stage preceding the final stage power amplifier. For this reason, a base station that performs adaptive array diversity and maximum ratio combining diversity in transmission (downstream) is not often used, and in many cases, transmission selection diversity is performed.

As described above, in the conventional radio base station apparatus of the TDD system, by performing diversity reception and transmission diversity, the transmission quality is improved and the communicable area is expanded.

[0012]

However, in the above-described conventional radio base station apparatus, when adaptive array diversity reception is performed in the uplink, if the downlink is transmission selection diversity, there is a difference in the diversity gain. Needs to be large output. Since the operation of suppressing the transmission wave is not performed for the interference wave source, there is a problem that the probability of causing interference to the mobile station connected to another neighboring base station increases, and the frequency use efficiency decreases. .

[0013] Even when adaptive array diversity is performed in downlink transmission, at least the last-stage power amplifier in the transmission circuit must be provided by the number of branches, which complicates the configuration. Further, the final-stage power amplifier requires good linearity over a wide dynamic range so that the phase characteristics do not change even when the output power changes. For this reason, there is a problem that the circuit must be configured with low power efficiency, and the circuit becomes large due to heat radiation or the like.

An object of the present invention is to solve the above problems, to provide a radio base station apparatus capable of reducing downlink interference and improving transmission quality without increasing transmission power.

[0015]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a plurality of antennas and a receiving circuit, a constant output power amplifier for supplying a transmission signal to the plurality of antennas, With a phase shifter for controlling the phase of the transmission signal or an antenna selection switch for selecting an antenna to be used for transmission from among the plurality of antennas, to reduce downlink interference and increase transmission power. Transmission quality can be improved.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 of the present invention provides a plurality of antennas and a plurality of receiving circuits which receive received signals from the plurality of antennas and convert the received signals into intermediate frequency signals or baseband signals. Multiplying means for multiplying the output signals of the plurality of receiving circuits by a composite weight of a complex number for controlling the amplitude and phase respectively; synthesizing means for adding and synthesizing the signals weighted by the multiplying means; Weight calculating means for calculating the composite weight so that the signal-to-interference power ratio and the signal-to-noise power ratio for the desired signal component included in the output are large; and the phase component of the composite weight output from the weight calculation means. Phase difference detecting means for detecting a phase difference, a memory for temporarily storing an output of the phase difference detecting means, a modulator for generating a modulated transmission signal, A phase shifter that controls and outputs the phase of the transmission signal, and a plurality of power amplifiers that amplify the transmission signal and the transmission signal phase-controlled by the phase shifter to required power and supply the transmission signals to the plurality of antennas, respectively. The phase shifter is controlled in accordance with the contents of the memory, and transmits a downlink signal with a phase difference corresponding to a combined weight for each diversity branch obtained at the time of uplink reception, so that the phase of the signal transmitted from each antenna is However, there is an effect that the antennas of the target partner station become almost in phase and reinforce each other.

According to a second aspect of the present invention, there are provided a plurality of antennas, a plurality of receiving circuits each receiving a received signal from each of the plurality of antennas, converting the received signals into a baseband signal, and an output from the plurality of receiving circuits. Multiplying the amplitude component of the baseband signal by the synthesized amplitude weight, adding the synthesized phase weight to the phase component of the baseband signal, and synthesizing, and suppressing the interference signal component included in the output of the synthesizing means. Weighting means for calculating a combined amplitude weight or a combined phase weight such that the signal-to-interference power ratio and the signal-to-noise power ratio for the desired signal component are large, and the phase component of the combined weight for a plurality of receiving circuit outputs A phase difference detecting means for detecting a phase difference between the phase components of the combined weights, a memory for temporarily storing an output of the phase difference detecting means, and a modulated transmission Modulator, a phase shifter that controls and outputs the phase of the transmission signal, and amplifies the transmission signal and the transmission signal that is phase-controlled by the phase shifter to the required power and transmits them to multiple antennas. A plurality of power amplifiers for supplying signals, wherein the phase shifter is controlled according to the contents of the memory, and transmits a downlink signal with a phase difference corresponding to a combined weight for each diversity branch obtained at the time of uplink reception. In the mobile station serving as an interference source, the phases of the signals transmitted from the antennas cancel each other out, and the antennas of the mobile station operate almost in-phase and reinforce each other. It also has the effect that the power amplifier has a constant output.

According to a third aspect of the present invention, there are provided a plurality of antennas, a plurality of receiving circuits each receiving a received signal from each of the plurality of antennas, converting the received signals into an intermediate frequency signal or a baseband signal, and The output of the receiving circuit is multiplied by a composite weight of a complex number for controlling the amplitude and phase, respectively, and added or synthesized, or the amplitude component of the received signal converted to the base band is multiplied by a synthesized amplitude weight to be converted to a base band. A combining means for adding a combined phase weight to the phase component of the received signal, and combining the combined signal and a signal-to-interference power ratio and a signal-to-interference ratio for a desired signal component so as to suppress the interference signal component included in the output of the combining means. Weight calculating means for calculating the combined weight or the combined amplitude weight and the combined phase weight so that the noise power ratio is large; Mino phase component or phase difference detection means for detecting a phase difference between the phase components mutually combining weight, and a memory for temporarily storing the output of said phase difference detecting means,,
A modulator that generates a modulated transmission signal, a power amplifier that amplifies the transmission signal to a required power, and a phase shifter that controls the phase of the power amplifier and outputs the power to a plurality of antennas, A transmission signal is supplied from a phase shifter or a power amplifier, respectively, and the phase shifter is controlled according to the contents of the memory. In addition to the same operation as the invention according to claim 2, one power amplifier is provided. It has the effect of being able to.

According to a fourth aspect of the present invention, the plurality of power amplifiers can be controlled so as to individually stop the outputs, and compare the absolute values of the combined weights with respect to the plurality of receiving circuit outputs. A control unit capable of controlling the operation of the power amplifier, wherein the control unit determines that the relative value to the largest one of the absolute values of the combined weights for the plurality of receiving circuit outputs is lower than a preset threshold value. , Which can be controlled so as to stop the output of the power amplifier that supplies the transmission signal to the antenna corresponding to the weight, has a large propagation loss with the mobile station that is setting the communication, or is a source of interference. Since the output of the power amplifier corresponding to the antenna whose propagation loss with the mobile station is small is stopped, the average power consumption is reduced.

According to a fifth aspect of the present invention, there is provided a radio communication apparatus comprising: a plurality of antennas; a plurality of receiving circuits supplied with reception signals from the plurality of antennas, and converting the reception signals into an intermediate frequency signal or a baseband signal; The output of the receiving circuit is multiplied by a composite weight of a complex number controlling the amplitude and phase, respectively, and added or synthesized, or the amplitude component of the received signal converted to the base band is multiplied by a synthesized amplitude weight, and the base band is multiplied by the base band. After adding the combining phase weight to the phase component of the converted received signal, combining means for combining, and suppressing the interference signal component included in the output of the combining means, or the signal-to-interference power ratio and the desired signal component and Weight calculating means for calculating the combined weight or the combined amplitude weight and the combined phase weight so that the signal-to-noise power ratio becomes large; and the plurality of reception circuit outputs A phase difference detecting means for detecting a phase component of the combined weight or a phase difference between the phase components of the combined weight, and a branch for comparing the combined weight or the absolute value of the combined weight and selecting the largest one. Selecting means, a modulator that generates a modulated transmission signal, a power amplifier that amplifies the transmission signal to a required power, and an antenna selection switch that selects an antenna that supplies an output of the power amplifier, The antenna selection switch is controlled by the branch selection means so as to be connected to the antenna corresponding to the composite weight having the maximum absolute value. It has the effect that it can be systematized.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

(Embodiment 1) FIG. 1 is a block diagram of a radio base station apparatus using TDD communication according to an embodiment of the present invention. Here, the number of branches is represented by K, and a radio base station apparatus that performs diversity of K branches (K is an integer of 2 or less) will be described. In FIG. 1, reference numeral 1 denotes an antenna provided for each branch. Generally, an omnidirectional antenna in a horizontal plane is used. However, for example, in the case of a sectorized cell or the like, a directional antenna may be used. Reference numeral 2 denotes an antenna switch for switching an antenna according to transmission and reception, and is connected to the R side during reception and to the T side during transmission. A receiving circuit 3 converts a received signal obtained by the antenna 1 for each branch into a baseband signal. Each receiving circuit 3 includes a high-frequency circuit 31, a band-pass filter 32, a common AGC 33, and a quasi-synchronous detector 34.

Similar to a general digitally modulated signal receiver, the band-pass filter 32 has a narrow band as far as possible without intersymbol interference, that is, a characteristic as a matched filter corresponding to a transmission waveform or an approximation thereof. A ceramic filter or the like having frequency characteristics is used. The common AGC 33 is an amplifier whose gain is controlled so that the amplitude of the branch having the highest received electric field strength is constant among all the branches, and the gains of the respective branches are set equal to each other. Therefore, the relative magnitude relationship between the amplitudes of the branches is maintained.

The quasi-synchronous detector 34 performs quadrature detection on the intermediate frequency signal output from the common AGC 33 by a local signal equal to the nominal carrier frequency, and converts a baseband signal comprising an in-phase (I) component and a quadrature (Q) component. These are output as baseband signals, ie, complex baseband signals, which are real and imaginary parts, respectively.

Reference numeral 6 denotes a weight calculation unit that receives the baseband signals (x ₁ , x ₂ ... X _K ) output from each reception circuit 3 and performs adaptive synthesis. The weight calculator 6 calculates a combined weight such that the desired signal reinforces and the interference signal cancels each other. Reference numeral 71 denotes a multiplier that weights the complex baseband signal obtained from the receiving circuit 3 by complex composite weights (w _c1 , w _c2 ... W _cK : hereinafter, referred to as weights) obtained by the weight calculator 6.

Reference numeral 72 denotes a combining unit that adds and combines the baseband signals weighted by the multiplier 71. A determination unit 73 compares the combined baseband signal with an appropriate threshold value, performs symbol determination, and outputs demodulated data.

Reference numeral 74 denotes a known signal generator which stores and generates known data called pilot symbols periodically inserted into a part of the transmission data. 75 is the judgment unit 7
3. The reference signal xr, which is an ideal complex baseband signal corresponding to the demodulated data determined in Step 3 or corresponding to the known data obtained from the known signal generating unit 74, and the complex baseband combined by the combining unit 72. This is a complex decision error detection unit that outputs a difference from a signal. The above configuration is the same as that of the conventionally used adaptive array diversity receiver.

Reference numeral 61 denotes a phase difference detection unit which detects a phase difference between the phase component of the weight of each branch and the phase component of the weight of an appropriate branch. Phase difference detector 6
1 to K-1 outputs are obtained. In this embodiment, the phase difference for the first branch is output. Reference numeral 63 denotes a memory in which the output of the phase difference detector 61 obtained during the reception period is written and held until the next transmission period. A sign inverter 64 inverts the input positive / negative signal.

Numeral 65 is a correction value memory which stores K-1 values for correcting irregularities between the antenna switch 2 and the quasi-synchronous detector 34 of the receiving circuit 3 and the phase specific branch in the transmitting circuit. Is stored. Reference numeral 66 denotes an adder, which stores the sign-inverted phase difference between branches at the time of reception in the correction value memory 6.
The output is corrected by the value of 5.

Reference numeral 8 denotes a modulator that modulates a carrier wave according to digital data to be transmitted to generate a transmission signal, and 9 denotes a frequency converter that converts the transmission signal generated by the modulator 8 into a predetermined communication frequency.

Numeral 10 denotes a phase shifter for shifting the phase of the transmission signal obtained from the frequency converter 9 on a branch-by-branch basis based on the phase difference between branches from the adder 66. A power amplifier 11 amplifies transmission signals from the phase shifter 10 and the frequency converter 9 to required power.

The output of the quasi-synchronous detector 34 is analog /
It is also possible to adopt a configuration in which digital conversion is performed, signal processing after the weight calculation unit 6 and the multiplier is performed by digital signal processing, and a part or all of the processing is described by software and processed by a digital signal processor.

The operation of the radio base station apparatus configured as described above will be described below. Now, assuming that the phase (transmission) characteristic of each unit is the characteristic shown in FIG. 2, the correction value memory 65 stores K-1 values shown in (Equation 1). The phase characteristics of the receiving circuit in FIG. 2 are those from the antenna switch 2 to the input of the quasi-synchronous detector 34, and the phase characteristics of the transmitting circuit are those from the output of the frequency converter 9 to the antenna switch 2. .

[0034]

(Equation 1)

These correction values include the phase difference of the input phase of the quasi-synchronous detector 34 with respect to the first branch when a signal having the same phase is input to the antenna side terminal of the antenna switch, and the phase shifter 10 as a whole. This is the difference from the phase difference of the antenna side terminal of the antenna switch 2 with respect to the first branch when set. Since the phase specification of the receiving circuit and the transmitting circuit is invariant with time, the correction value is measured at the time of installation of the apparatus or during an adjustment process in manufacturing, and the correction value memory 65
Can be written to.

In the reception period, the antenna switch 2 is connected to the R side in the figure, and the reception signal received by the antenna 1 is converted by the reception circuit 3 into a baseband signal for each branch. The weighted addition is performed by the combining unit 72 to obtain a demodulated output. At this time, the weight calculator 6
In the above, the weight of each unit launch is adaptively controlled so that the absolute value of the output of the complex decision error detection unit 75 becomes small, so that a good complex baseband signal with reduced noise and interference components appears at the output of the synthesis unit 72. . That is, the operation is exactly the same as that of the conventionally used adaptive array diversity receiver.

At this time, the phase difference of the phase component of the weight of each branch with respect to the first branch is detected by the phase difference detecting section 61 and is taken into the memory 63.

Next, at the time of transmission, the antenna switch 2
The transmission signal is connected to the transmission side and modulated in accordance with the transmission data. The transmission signal is generated by the modulator 8 and is converted to the communication frequency by the frequency converter 9. The frequency-converted transmission signal is amplified by a power amplifier 11 directly or via a phase shifter 10 and transmitted to a mobile station via an antenna switch 2 and an antenna 1. At this time, the value stored in the memory 63 at the time of reception is read out, and K−1 values obtained through the sign inverter 64 and the subtractor 66 are set in the phase shifter 10. Therefore, if the phase characteristic of the propagation path in the reception period is as shown in FIG. 2, the value set in the phase shifter 10 when there is no interference wave is (Equation 2).

[0039]

(Equation 2)

The phase characteristics of the propagation path include the feed line to the antenna 1 and the antenna switch 2. If the moving speed of the mobile station is sufficiently low and the change in the propagation path phase characteristic from the reception period can be ignored, the carrier phase ψ1 of the radio wave transmitted from the first branch in the mobile station is apparent from FIG.

[0041]

(Equation 3)

Is as follows. On the other hand, carrier phases {2, ψ} of the radio waves transmitted from the other branches at the mobile station.
3,. . . ψK also becomes as shown in (Equation 4), and is in phase with each other.

[0043]

(Equation 4)

Therefore, when there is no interference wave, the mobile station adds the transmission signals from each branch in phase, so that the downlink has the same effect as the equal gain combining diversity reception, and the transmission quality is low. improves.

On the other hand, when an interference wave arrives from another mobile station connected to another base station and using the same radio channel, the downlink transmission signal interferes with the other mobile station. Will be given. At the time of reception, a weight is set so as to cancel out the interference wave from the other mobile station as much as possible.At the time of transmission, the same phase difference is applied between the branches and transmitted. The transmission signals arrive so that their phases cancel each other. Therefore, at the time of reception, it operates in the same manner as the conventional adaptive array diversity to suppress interference from other poles, and at the time of transmission, suppresses interference given to other poles.

When used for TDMA communication, the memory 63 may store an address by setting an address for each time slot or for each mobile station to communicate with.

In this embodiment, the outputs of all the branches, that is, the outputs of the power amplifiers 11 are equal to each other and are constant. However, as shown in FIG. 3, the absolute values of the weights of the respective branches are relatively compared. , An absolute value detector 67 for detecting a branch whose absolute value is less than or equal to a specified value (for example, 10 dB) relative to the branch having the maximum value, and the transmission control switch 12, and the transmission power is set to 0 for the branch. The control may be performed. In such a case, the reception power at the mobile station hardly changes even if the transmission of the branch is stopped. Therefore, the power consumption required for transmission can be reduced on average, not only contributing to the miniaturization of the device, but also stopping the transmission of radio waves from useless antennas that do not contribute to transmission, so that neighboring base stations, etc. Interference with other communications using the frequency can also be suppressed. That is, the repeated use distance of the same frequency can be shortened, and the frequency use efficiency is improved.

(Embodiment 2) In Embodiment 1, the phase shifter 10 in the transmission circuit is arranged on the input side of the power amplifier 11, so that transmission is possible even when the insertion loss of the phase shifter 10 is large. The decrease in power efficiency of the circuit is small. But,
If a phase shifter having a small insertion loss is used, the configuration shown in FIG. 3 can be obtained.

FIG. 4 shows T according to a second embodiment of the present invention.
It is a block diagram of the wireless base station apparatus by DD communication. In FIG. 4, 1 is an antenna, 2 is an antenna switch, 3 is a receiving circuit, 6 is a weight calculator, 71 is a multiplier, 72 is a combiner, 73 is a determiner, 74 is a known signal generator, and 75 is a complex. A determination error detection unit, 61 is a phase difference detection unit, 63 is a memory, 64 is a sign inverter, 65 is a correction value memory, 66 is an adder, 8 is a modulator, and 9 is a frequency converter. This is the same as that described in the first embodiment.

Reference numeral 110 denotes a power amplifier having an output power K times that of the power amplifier 11 in the first embodiment. 1
Reference numeral 00 denotes a phase shifter having a relatively low loss configuration.

For example, a configuration is used in which a plurality of fixed phase circuits such as a coaxial line shown in FIG. In FIG. 5, reference numerals 101a, 101b, and 101c denote distributed constant lines as phase shift circuits, and reference numerals 102a and 102b denote changeover switches. With this configuration,
The phase shift circuit can have low loss. The settable phase shift amount is a discrete value, but the resolution, that is, the phase switching step is π /
Must be 3 or less. In the case where interference signals of arbitrary two branches are added by weighting as equal amplitude and phase difference π and cancel each other, if the phase error is π / 3 or less, the amplitude does not increase from the original signal and the amplitude always decreases. Because.

As described above, by disposing the phase shifter 100 on the main side of the power amplifier 11, the number of power amplifiers becomes one,
The configuration is simplified.

(Embodiment 3) FIG. 6 is a block diagram of a radio base station apparatus using TDD communication according to a second embodiment of the present invention. 6, 1 is an antenna, 2 is an antenna switch, 3 is a receiving circuit, 6 is a weight calculator, 71
Is a multiplier, 72 is a synthesis unit, 73 is a determination unit, 74 is a known signal generation unit, 75 is a complex determination error detection unit, 8 is a modulator, 9
Is a frequency converter, and 11 is a power amplifier, and their configurations are the same as those described in the first embodiment.

Reference numeral 68 denotes a transmission branch selector, which determines a branch having the largest absolute value among the weights of the branches obtained by the weight calculator 6. Reference numeral 13 denotes an antenna selection switch, which switches the transmission antenna, that is, the transmission branch, according to the determination result of the transmission branch selection unit 68.

In this case, the configuration is a simple configuration similar to the transmission selection diversity described in the background art, but the selection of the transmission branch is determined by the adaptively controlled weight so as to reduce the interference. In transmission, interference with other communication using the same frequency in a neighboring base station or the like can also be suppressed. That is, the repeated use distance of the same frequency can be shortened, and the frequency use efficiency is improved.

[0056]

According to the present invention, it is possible to improve downlink transmission quality without increasing the total transmission power of each branch from the transmission power of the conventional transmission selection diversity. For this reason, the communicable range is expanded, or transmission power can be suppressed. For example, it is possible to provide a wireless base station apparatus suitable for a case where it is desirable to increase the zone radius per base station as much as possible in a low traffic area such as a suburban area. Further, since the transmission power in the transmission power amplifier is always constant, the dynamic range of the transmission power amplifier may be about the same as that of a conventional base station apparatus using transmission selection diversity. Moreover, since it is not necessary to consider the phase change characteristic due to the level change, a transmission power amplifier that is more efficient and cheaper than the base station apparatus using the maximum transmission ratio combining diversity or the conventional adaptive array diversity transmission can be used. Manufacturing costs can be reduced. Further, for a branch whose reception level is equal to or less than a specified value with respect to the maximum reception level branch, transmission is performed by controlling the transmission power to 0 or by selecting and transmitting an antenna having the lowest interference and a desired reception level. Power consumption required can be reduced on average, and an excellent wireless base station apparatus with improved frequency use efficiency can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a wireless base station device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a phase relationship during operation of the wireless base station device according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing another configuration of the wireless base station device.

FIG. 4 is a block diagram showing a configuration of a wireless base station device according to a second embodiment of the present invention.

FIG. 5 is a configuration diagram of a phase shifter of the wireless base station device.

FIG. 6 is a block diagram illustrating a configuration of a wireless base station device according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna 2 Antenna switch 3 Receiving circuit 6 Weight calculation unit 8 Modulator 9 Frequency converter 10 Phase shifter 11 Power amplifier 33 Common AGC 34 Quasi-synchronous detector 61 Phase difference detector 63 Memory 64 Sign inverter 65 Correction value memory 66 Adder 71 Multiplier 72 Synthesis Unit 73 Judgment Unit 74 Known Signal Generation Unit 75 Complex Judgment Error Detection Unit

Continued on the front page F term (reference) 5K059 CC02 CC03 CC04 DD33 DD37 EE03 5K067 AA02 AA22 BB02 CC24 EE10 EE22 GG01 GG11 KK03

Claims (5)

[Claims] 1. A plurality of antennas, a plurality of receiving circuits supplied with received signals from the plurality of antennas, respectively, and converting the received signals into an intermediate frequency signal or a baseband signal; Multiplying means for multiplying a composite weight for controlling the phase and a complex number; synthesizing means for adding and synthesizing the signals weighted by the multiplying means; and a signal-to-interference power ratio relating to a desired signal component included in an output of the synthesizing means. Weight calculating means for calculating the combined weight so that the signal-to-noise power ratio is large; phase difference detecting means for detecting a phase difference between phase components of the combined weight output from the weight calculating means; A memory for temporarily storing the output of the phase difference detection means, a modulator for generating a modulated transmission signal, and a phase shifter for controlling and outputting the phase of the transmission signal A plurality of power amplifiers for amplifying the transmission signal and the transmission signal phase-controlled by the phase shifter to required power and supplying the transmission signals to the plurality of antennas, respectively, wherein the phase shifter is A radio base station apparatus which is controlled according to contents and transmits a downlink signal with a phase difference according to a combined weight for each diversity branch obtained at the time of uplink reception. 2. A plurality of antennas, and receiving signals supplied from the plurality of antennas, respectively.
A plurality of receiving circuits for converting to a baseband signal, multiplying an amplitude component of a baseband signal output from the plurality of receiving circuits by a composite amplitude weight, and adding a composite phase weight to a phase component of the baseband signal. After that, the combining means for combining and the combined amplitude weight or combined phase so as to suppress the interference signal component included in the output of the combining means or to increase the signal-to-interference power ratio and the signal-to-noise power ratio relating to the desired signal component. Weight calculating means for calculating a weight, phase difference detecting means for detecting a phase component of the combined weight or a phase difference between the phase components of the combined weight with respect to the plurality of receiving circuit outputs, and an output of the phase difference detecting means A memory for temporarily storing, a modulator for generating a modulated transmission signal, and a phase shifter for controlling and outputting the phase of the transmission signal,
A plurality of power amplifiers for amplifying the transmission signal and the transmission signal phase-controlled by the phase shifter to required power and supplying the transmission signals to the plurality of antennas, respectively, wherein the phase shifter is configured to store contents of the memory. And transmitting a downlink signal with a phase difference corresponding to a combined weight for each diversity branch obtained at the time of uplink reception. 3. A plurality of antennas, a plurality of receiving circuits respectively supplied with receiving signals from the plurality of antennas, and converting the signals into an intermediate frequency signal or a baseband signal, and outputs the outputs of the plurality of receiving circuits with amplitude and amplitude, respectively. Multiply and combine the composite weights of the complex numbers for controlling the phases, or multiply the amplitude component of the received signal converted to the base band by the composite amplitude weight, and perform the phase component of the received signal converted to the base band. After adding the combined phase weights, the combining means for combining and the interference signal component included in the output of the combining means are suppressed, or the signal-to-interference power ratio and the signal-to-noise power ratio for the desired signal component are increased. Weight calculating means for calculating the composite weight or the composite amplitude weight and the composite phase weight; and a phase component of the composite weight for the plurality of receiving circuit outputs. A phase difference detecting means for detecting a phase difference between the phase components of the composite weight, a memory for temporarily storing an output of the phase difference detecting means, a modulator for generating a modulated transmission signal, A power amplifier that amplifies a signal to a required power, and a phase shifter that controls the phase of the power amplifier and outputs the signal to the plurality of antennas, wherein the plurality of antennas are respectively provided from the phase shifter or the power amplifier. A radio base station apparatus, supplied with a transmission signal, wherein the phase shifter is controlled according to the contents of the memory. 4. The plurality of power amplifiers can be controlled to individually stop outputs, and control the operation of the power amplifiers by comparing the absolute values of the combined weights with respect to the plurality of receiving circuit outputs. Possible control means, wherein the control means corresponds to a case where a relative value to the largest one of the absolute values of the composite weights for the outputs of the plurality of receiving circuits is less than a preset threshold value. The radio base station apparatus according to claim 1, wherein control is performed so as to stop an output of a power amplifier that supplies a transmission signal to the antenna. 5. A plurality of antennas, a plurality of receiving circuits respectively supplied with received signals from the plurality of antennas, and converting the received signals into an intermediate frequency signal or a baseband signal, and outputs the outputs of the plurality of receiving circuits respectively with amplitude and amplitude. Multiply and combine the composite weights of the complex numbers for controlling the phases, or multiply the amplitude component of the received signal converted to the base band by the composite amplitude weight, and perform the phase component of the received signal converted to the base band. After adding the combined phase weights, the combining means for combining and the interference signal component included in the output of the combining means are suppressed, or the signal-to-interference power ratio and the signal-to-noise power ratio for the desired signal component are increased. Weight calculating means for calculating the combined weight or the combined amplitude weight and the combined phase weight, and a phase component of the combined weight with respect to the plurality of receiving circuit outputs; Or a phase difference detecting means for detecting a phase difference between the phase components of the combined weights, a branch selecting means for comparing the combined weights or the absolute values of the combined weights, and selecting the largest one, A modulator that generates a transmission signal; a power amplifier that amplifies the transmission signal to a required power; and an antenna selection switch that selects an antenna that supplies an output of the power amplifier. A radio base station apparatus controlled by a selection unit to connect to the antenna corresponding to the composite weight having the largest absolute value.