JPH04265023A - Space diversity same phase synthesizing circuit - Google Patents

Abstract

PURPOSE:To simplify the whole circuit configuration by constituting the means for correcting the phase of a signal received by each antenna in the same way. CONSTITUTION:Each antenna 1-N receives the same radio wave, and outputs it as signals S1-SN to phase correcting means 301-30N. The means 301-30N all consist of the same constitution, all the same reference signals Sd generated from a reference signal generating means 33 are inputted thereto, and a correction for aligning the phase of each signal S1-SN with the phase of this inputted reference signal Sd is executed. The corrected signal outputted from each means 301-30N is synthesized by a signal synthesizing means 34 and outputted. In such a way, the whole circuit can be realized by simple constitution.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a receiving system for a digital multiplex radio device, and relates to a space diversity in-phase synthesis method in which a plurality of antennas are installed spatially apart, and the radio waves received by each antenna are combined by matching the phases. Regarding circuits.

[0002] In recent years, various compensation techniques have been introduced to improve the quality of wireless lines, and in space diversity, a shift to multi-sided antennas, such as changing from two-sided antennas to three-sided antennas, is being attempted. In this case, signal synthesis technology is required to have high accuracy and high reliability.

On the other hand, modulated waves are multiplied, and resistance to fading is improved when multiple waves that have been multiplied by 1, 3, 6, 12, etc. are transmitted all at once. is aimed at.

[0004] Since this is implemented by performing individual synthesis corresponding to each multiplied signal wave, the circuit size tends to increase and the control becomes complicated. Therefore, there is a need for a space diversity in-phase synthesis circuit that can reduce the circuit scale and simplify control by simplifying and commonizing the circuit.

[0005]

2. Description of the Related Art FIG. 3 is a block diagram of a conventional space diversity in-phase combining circuit, and shows an in-phase combining circuit in a one-multicarrier system with a three-sided antenna configuration.

[0006] In this figure, numerals 1, 2, and 3 are first to third antennas that are spaced apart from each other. Each of the antennas 1 to 3 receives a radio wave (input signal) S sent from a transmitter (not shown) and outputs it to a subsequent stage. Each of the antennas 1 to 3 receives the same radio wave S, but in order to be able to distinguish each antenna 1 to 3, the signals output to the subsequent stage are designated by the symbols Sa, Sa, and S, respectively, as shown in the figure.
Sb and Sc are attached.

Reference numerals 4, 5, 6, and 7 each represent a branching device, which divides the power of one input signal into two, thereby branching into two and outputting the two.

8, 9, 10, and 11 are automatic gain control amplifiers, respectively. The automatic gain control amplifiers 8 to 11 output phase information of the input signal by extracting power near the center of the frequency band of the input signal.

[0009] 12 and 13 are mixers, and the input 2
It calculates the phase difference between the two phase information and outputs it.

Reference numerals 14 and 15 denote infinite phase shifters, which change the phase of the input signal according to the sine signal SS and cosine signal CS output from the infinite phase shifter control circuits 16 and 17, and output the same. It is.

The infinite phase shifter control circuits 16 and 17 output a sine signal SS and a cosine signal CS for correcting the amplitude and angle of the signal according to the phase difference output from each mixer 12 and 13. The sin signal SS is output as a voltage value corresponding to the phase difference when the phase of the signal Sb lags the phase of the signal Sa. When the phase of the signal Sb leads the phase of the signal Sa, the cos signal CS is output as a voltage value corresponding to the phase difference.

[0012] Numerals 18 and 19 are combiners that combine two signals and output the result.

In the space diversity in-phase combining circuit configured as described above, the radio waves S are transmitted to each antenna 1.
, 2, and 3 will be explained.

The signal Sa from the first antenna 1 is input to the splitter 4 and is split into two signals (one is called the main signal and the other is called the control signal). The main signal is output to the combiner 18, and the control signal is output to the automatic gain control amplifier 8.

When the automatic gain control amplifier 8 receives the control signal, it outputs the phase information to the mixer 12. In other words, the phase information of the signal Sa from antenna 1 is
It will be output to 2.

The signal Sb from the second antenna 2 is input to the splitter 5 via the infinite phase shifter 14 and is split. This branched main signal is output to the combiner 18, and the control signal is output to the automatic gain control amplifier 9. Then, the phase information of the signal Sb is transferred from the automatic gain control amplifier 9 to the mixer 12.
Output to.

The mixer 12 determines a phase difference from both phase information and outputs it to the infinite phase shifter control circuit 16. The control circuit 16 generates a sine signal SS or a cosine signal CS according to the phase difference, and outputs this to the infinite phase shifter 14. The infinite phase shifter 14 changes the phase of the signal Sb from the antenna 2 according to the sine signal SS or the cosine signal CS, and outputs it to the splitter 5.

In other words, since the phase of the signal Sb changed by the infinite phase shifter 14 corresponds to the sine signal SS or the cosine signal CS, it is changed to match the phase of the signal Sa. . Therefore, infinite phase shifter 14 - splitter 5 - automatic gain control amplifier 9 - mixer 1
2-Infinite phase shifter control circuit 16-By repeating the control in which the phase of the signal Sb is changed by the loop of the infinite phase shifter 14, the phase of the signal Sb becomes the same phase as the phase of the signal Sa.

Then, the signal Sa output from the branching device 4
and the signal Sb output from the splitter 5, which is in phase with the signal Sa, are combined by the combiner 18, and a combined signal S
It is output to the branching device 6 as ab.

The signal Sab is input to the splitter 4 and is split into a main signal and a control signal, the main signal is output to the combiner 19, and the control signal is output to the automatic gain control amplifier 10. When the automatic gain control amplifier 10 receives a control signal, it outputs the phase information to the mixer 13. In other words,
Phase information of the composite signal Sab will be input to the mixer 12.

The signal Sc from the antenna 3 is input to the splitter 7 via the infinite phase shifter 15 and is split. This branched main signal is output to the combiner 19, and the control signal is output to the automatic gain control amplifier 11. by this,
Phase information of the signal Sab is output from the automatic gain control amplifier 11 to the mixer 13.

The mixer 13 determines a phase difference from both phase information and outputs it to the infinite phase shifter control circuit 17. The control circuit 17 generates a sine signal SS or a cosine signal CS according to the phase difference, and outputs this to the infinite phase shifter 15. Infinite phase shifter 15 changes the phase of signal Sc from antenna 3 according to sine signal SS or cosine signal CS, and outputs it to splitter 7 .

In other words, since the phase of the signal Sc changed by the infinite phase shifter 15 corresponds to the sine signal SS or the cosine signal CS, it is changed to match the phase of the signal Sab. . Therefore, the control in which the phase of the signal Sc is changed by the loop of infinite phase shifter 15 - splitter 7 - automatic gain control amplifier 11 - mixer 13 - infinite phase shifter control circuit 17 - infinite phase shifter 15 is repeated. Therefore, the phase of the signal Sc becomes the composite signal Sa
It becomes in phase with the phase of b.

[0024] Then, the composite signal Sab output from the splitter 6 and the signal Sc output from the splitter 7, which is in phase with the composite signal Sab, are combined by the combiner 19 and output as an output signal So. Ru.

[0025]

In the space diversity in-phase combining circuit described above, after combining the signal Sa of the first antenna 1 and the signal Sb of the second antenna 2,
The control is such that the signal Sc from the third antenna 3 is combined. In other words, by matching the phase of the signal Sb to the signal Sa,
There is a master-slave relationship in which the phase of the signal Sc is matched to the phase-matched composite signal Sab, which poses a problem in that the entire circuit becomes complicated.

Further, normally, a circuit for combining the signal Sa of the first antenna 1 and the signal Sb of the second antenna 2 is formed in one panel, and the combined signal Sab and the signal Sc of the third antenna 3 are combined. The circuit is formed on one other panel, and these two panels are connected with a signal cable (corresponding to the cable that connects combiner 18 and branch 6 in Fig. 4) to form the entire circuit. A method is being taken. For this reason, a problem arises in that adjustment for matching signal transmission times between panels becomes troublesome.

[0027] The above problems will be exacerbated if the number of antennas is further increased to create a multi-faceted antenna.

The present invention has been made in view of the above points, and can simplify the overall circuit configuration.
Another object of the present invention is to provide a space diversity in-phase combining circuit that can facilitate adjustment between panels.

[0029]

[Means for Solving the Problems] FIG. 1 shows a diagram of the principle of the present invention. In the figure, 1, 2, . . . , N are antennas, respectively. Each antenna 1, 2,...,N receives the same radio wave and outputs it as a signal S1, S2,...,SN to the phase correction means 301, 302,..., 30N.

[0030]Each phase correction means 301, 302,...,
30N all have the same configuration, and all the same reference signals Sd, Sd, Sd, generated from the reference signal generating means 33
... is input, and the phase of this input reference signal Sd is,
This is to perform correction to match the phases of each signal S1, S2,..., SN.

Reference numeral 34 denotes a signal synthesizing means, which synthesizes and outputs the corrected signals outputted from the respective phase correcting means 301, 302, . . . , 30N.

Furthermore, each phase correction means 301 and 302
, . and means for changing the phase of the signal received by the antenna.

Furthermore, each phase correction means 301 and 302
, ..., 30N may be formed into one panel.

[0034]

[Operation] According to the present invention, the phases of the signals S1 to SN from each of the antennas 1 to N are adjusted by the phase correction means 301 to 30N having the same configuration to the reference signal generation means 3.
Since the phase of the reference signal Sd from 3 can be matched, the entire circuit can be realized with a simple configuration.

Furthermore, each phase correction means 301 to 30N
If each of them is formed into one panel, when configuring an arbitrary number of multifaceted antennas, it is sufficient to use the same number of panels as the number of antennas, so it can be easily accommodated.

Moreover, in this case, since the same reference signal Sd only needs to be input to each panel, adjustment between the panels is easy.

The reason why it can be made into one panel is because signal correction can be performed for each phase correction means 301 to 30N, and the corrections are made to the same phase.

[0038]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing the configuration of a space diversity in-phase combining circuit according to an embodiment of the present invention. The circuit shown in this figure shows an in-phase synthesis circuit in a 1-multicarrier system with a three-sided antenna configuration, similar to the conventional example shown in FIG. and the explanation thereof will be omitted.

In FIG. 2, 1, 2, and 3 are first to third antennas; 30, 31, and 32 are first to third phase correction units;
3 is a reference signal generator, and 34 is a synthesizer.

The first to third phase correction sections 30 to 32 are for correcting the phases of the signals Sa, Sb, and Sc from the respective antennas 1 to 3, and all have the same structure. This is configured similarly to the loop circuit for correcting the phase of the signal Sb (or signal Sc) shown in FIG. 3. That is, the loop circuit is composed of the infinite phase shifter 14-brancher 5-automatic gain control amplifier 9-as explained in the conventional example shown in FIG.
This circuit is composed of a mixer 12 and an infinite phase shifter control circuit 16.

[0041] The reference signal generation section 33 includes phase correction sections 30 to 30.
32 outputs a reference signal Sd for correcting the phase of each signal Sa, Sb, Sc, and the oscillator 3
5 and a branch 36. The oscillator 35 is
It generates a signal with a phase suitable for correcting the phase of each signal Sa, Sb, and Sc. The splitter 33 divides the power of the signal output from the oscillator 35 into three parts and outputs each part as a reference signal Sd.

[0042] The synthesizer 34 also includes each phase correction unit 30 to
The signals output from the 32 branchers 5 are combined and outputted as the output signal So.

In the space diversity in-phase combining circuit configured as described above, the radio waves S are transmitted to each antenna 1.
, 2, and 3 will be explained.

Signal Sa from first antenna 1 is input to first phase corrector 30 . That is, the signal Sa is input to the splitter 5 via the infinite phase shifter 14, and is split into a main signal and a control signal by the splitter 5. The main signal is output to the combiner 34, and the control signal is output to the automatic gain control amplifier 9.

The automatic gain control amplifier 9 detects phase information from the input control signal and outputs this to the mixer 12. In other words, the phase information of the signal Sa is
It will be output to.

On the other hand, the mixer 12 includes a reference signal generator 3
Since the reference signal Sd output from the mixer 3 is input, the mixer 12 determines the phase difference between the signal Sa and the reference signal Sd, and outputs this to the infinite phase shifter control circuit 16.

The infinite phase shifter control circuit 16 generates a sine signal SS or a cosine signal CS depending on the phase difference, and outputs this to the infinite phase shifter 14.

In the infinite phase shifter 14, the phase of the signal Sa is changed according to the sine signal SS or the cosine signal CS and is output to the splitter 5.

In other words, the phase of the signal Sa changed by the infinite phase shifter 14 is changed to match the phase of the reference signal Sd. Therefore, infinite phase shifter 1
4-brancher 5-automatic gain control amplifier 9-mixer 12-infinite phase shifter control circuit 16-infinite phase shifter 14 By repeating control in which the phase of the signal Sa is changed by the loop, the phase of the signal Sa is changed. is in phase with the phase of the reference signal Sd.

The signal Sa output from the splitter 5, which is in phase with the reference signal Sd, is output to the combiner 34.

The signal Sb from the second antenna 2 is input to the second phase correction section 31. Then, in the same manner as the phase correction of the signal Sa by the first phase correction section 30 described above, in the second phase correction section 31, the phase of the signal Sb is adjusted to the reference signal Sd.
The signal is corrected by , and then output to the synthesizer 34 .

Similarly, in the case of the signal Sc from the third antenna 3, the phase of the signal Sc is corrected by the reference signal Sd in the third phase correction section 32, and is output to the synthesizer 34.

The synthesizer 34 synthesizes the signals Sa, Sb, and Sc that are in phase with the reference signal Sd, and outputs this as an output signal So.

As explained above, according to the space diversity in-phase combining circuit of the present invention, the phases of the signals Sa, Sb, and Sc received by the antennas 1 to 3 are adjusted by the phase correction units 30 to 32 having the same configuration. , corrected so as to be in phase with the reference signal Sd outputted from the reference signal generator 33, and the corrected signals Sa, Sb, Sc are sent to the synthesizer 34.
Since the signals are synthesized and output, the entire circuit can be easily constructed.

[0055] Also, each phase correction section 30, 31, 32 is
Since it is sufficient to configure the system into two panels and input the reference signal Sd in the same way to each panel, adjustment between the panels, which conventionally took time and effort, becomes easy.

Furthermore, according to such a circuit configuration, the input phase of each signal can be individually monitored by monitoring the phase difference voltage output from the mixer 12 of each phase correction section 30 to 32. can.

By the way, the above-mentioned space diversity in-phase combining circuit shows an in-phase combining circuit in a 1-multicarrier system with a three-sided antenna configuration, but if this is to be a 3-multicarrier system, the antenna and phase A splitter that divides one signal into three is interposed between the correction unit and the phase correction unit is connected to each of the three output ends of the splitter, and the reference signal Sd is input to each phase correction unit. Finally, the corrected signals may be combined in three ways.

In other words, even when a multi-faceted antenna is used, the circuit can be easily constructed.

[0059]

[Effects of the Invention] As explained above, according to the present invention,
Since the means for correcting the phase of the signal received by each antenna can be configured in the same manner, the overall circuit configuration can be simplified.

Furthermore, since the circuit for correcting the phase of a signal received by one antenna can be configured in one panel, it is possible to easily adapt to a multifaceted antenna configuration.

Furthermore, since it is only necessary to input a reference signal of the same phase as a reference for phase correction between each panel, even when the entire circuit is constructed using a large number of panels, delay time etc. between panels can be reduced. This has the effect of facilitating adjustment.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle of the present invention.

FIG. 2 is a diagram showing the configuration of a space diversity in-phase combining circuit according to an embodiment of the present invention.

FIG. 3 is a diagram showing the configuration of a conventional space diversity in-phase combining circuit.

[Explanation of symbols]

1, 2,...,N antennas 301, 302,..., 30N phase correction means 3
3 Reference signal generating means 34 Signal combining means S1, S2,..., SN Signal Sd received by each antenna 1 to N Reference signal

Claims (3)

[Claims] [Claim 1] Multiple antennas (1, 2, ..., N)
Each signal received at (S1, S2, ..., SN
) in a space diversity in-phase combining circuit that corrects the phases of the signals to be in-phase and synthesizes and outputs the in-phase signals, a reference signal generating means (
33) and each of the above signals (S1, S2, ..., SN
) to be in phase with the phase of the reference signal (Sd) (301, 302,..., 3)
0N) and the plurality of phase correction means (301, 30
2,..., 30N) and a signal synthesizing means (34) for synthesizing and outputting the corrected signals output from the space diversity in-phase synthesis circuit. 2. The plurality of phase correction means (301,
302,..., 30N), means for detecting phase information of a signal received by an antenna, means for calculating and outputting a difference between the phase according to the phase information and the phase of the reference signal, and according to the difference. 2. The space diversity in-phase combining circuit according to claim 1, further comprising means for changing the phase of a signal received by said antenna. 3. The plurality of phase correction means (301,
302, . . . , 30N), each of which is formed into one panel.