JP3107843B2 - Space diversity in-phase synthesis circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiving system for a digital multiplex radio apparatus, and more particularly to a space diversity in-phase combining system in which a plurality of antennas are spatially separated from each other to combine the phases of radio waves received by the respective antennas. Circuit.

In recent years, while various compensation techniques have been introduced to improve the quality of a wireless channel, space diversity has been shifted to a multi-surface antenna such as a three-surface antenna instead of a two-surface antenna. In this case, the accuracy and high reliability of the signal synthesis technique are required.

[0003] On the other hand, the modulated wave has been multiplied, and the resistance to fading is improved when multiple waves subjected to 1 multi, 3 multi, 6 multi, 12 multi, etc. are transmitted collectively. Is aimed at.

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

[0005]

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

In FIG. 1, reference numerals 1, 2, and 3 denote first to third antennas, respectively, which are spatially separated from each other. Each of the antennas 1 to 3 receives a radio wave (input signal) S transmitted from a transmitting device (not shown) and outputs it to a subsequent stage. Although the same radio wave S is received by each of the antennas 1 to 3, the signals output to the subsequent stages are denoted by symbols S as shown in the drawing so that the antennas 1 to 3 can be distinguished from each other.
a, Sb, Sc are attached.

[0007] Reference numerals 4, 5, 6, and 7 denote splitters, each of which divides the power of one input signal into two and outputs the resulting signal.

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

Reference numerals 12 and 13 denote mixers which are input 2
The phase difference between two pieces of phase information is obtained and output.

Reference numerals 14 and 15 denote infinite phase shifters which change the phase of the input signal in accordance with the sine signal SS and the cos signal CS output from the infinite phase shifter control circuits 16 and 17 and output the signals. It is.

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

Reference numerals 18 and 19 denote combiners for combining and outputting two signals.

The operation of the space diversity in-phase combining circuit having such a configuration when the radio wave S is received by each of the antennas 1, 2, and 3 will be described.

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

When the control signal is input, the automatic gain control amplifier 8 outputs the phase information to the mixer 12. That is, the phase information of the signal Sa from the antenna 1 is
2 will be output.

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

The mixer 12 obtains a phase difference from both pieces of phase information and outputs it to the infinite phase shifter control circuit 16. The control circuit 16 generates a sine signal SS or a cos 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 cos signal CS, and outputs it to the splitter 5.

That is, since the phase of the signal Sb changed by the infinite phase shifter 14 is in accordance with the sin signal SS or the cos signal CS, it is changed to match the phase of the signal Sa. . Therefore, infinite phase shifter 14-branch device 5-automatic gain control amplifier 9-mixer 1
The control of changing the phase of the signal Sb by the loop of the 2-infinite phase shifter control circuit 16-infinite phase shifter 14 is repeated, so that the phase of the signal Sb becomes the same as the phase of the signal Sa.

The signal Sa output from the branching device 4
And the signal Sb output from the splitter 5 in phase with the signal Sa are synthesized by the synthesizer 18 to obtain the synthesized signal S
The signal is output to the branching unit 6 as ab.

The signal Sab is input to the splitter 4 and split into a main signal and a control signal. The main signal is output to the synthesizer 19, and the control signal is output to the automatic gain control amplifier 10. When the control signal is input, the automatic gain control amplifier 10 outputs the phase information to the mixer 13. That is,
The phase information of the composite signal Sab is 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 split. The split main signal is output to the synthesizer 19, and the control signal is output to the automatic gain control amplifier 11. by this,
The phase information of the signal Sab is output from the automatic gain control amplifier 11 to the mixer 13.

The mixer 13 obtains a phase difference from both pieces of phase information and outputs it to the infinite phase shifter control circuit 17. The control circuit 17 generates a sine signal SS or a cos signal CS according to the phase difference, and outputs this to the infinite phase shifter 15. The infinite phase shifter 15 changes the phase of the signal Sc from the antenna 3 according to the sin signal SS or the cos signal CS, and outputs the same to the branching unit 7.

That is, since the phase of the signal Sc changed by the infinite phase shifter 15 is in accordance with the sine signal SS or the cos signal CS, it is changed to match the phase of the signal Sab. . Therefore, the control of changing the phase of the signal Sc by the loop of the infinite phase shifter 15, the branch unit 7, the automatic gain control amplifier 11, the mixer 13, the infinite phase shifter control circuit 17, and the infinite phase shifter 15 is repeated. As a result, the phase of the signal Sc becomes
The phase becomes the same as the phase of b.

The combined signal Sab output from the splitter 6 and the signal Sc output from the splitter 7 having the same phase as the synthesized signal Sab are combined by the combiner 19 and output as the output signal So. You.

[0025]

In the above-described space diversity in-phase combining circuit, after the signal Sa of the first antenna 1 and the signal Sb of the second antenna 2 are combined,
The control is such that the signal Sc of the third antenna 3 is combined. That is, the phase of the signal Sb is adjusted to the phase of the signal Sa,
There is a master-slave relationship in which the phase of the signal Sc is adjusted to the synthesized signal Sab in which the phase has been adjusted, and there is a problem that the entire circuit becomes complicated.

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. It is stated that the circuit is formed on another panel and these two panels are connected by a signal cable (corresponding to the cable connecting the combiner 18 and the splitter 6 in FIG. 4) to form the entire circuit. The method has been taken. For this reason, there arises a problem that adjustment for adjusting the signal transmission time between panels becomes complicated.

The above problem is further increased when the number of antennas is further increased and a multi-plane antenna is used.

The present invention has been made in view of the above points, and can simplify the entire circuit configuration.
It is another object of the present invention to provide a space diversity in-phase combining circuit capable of facilitating adjustment between panels.

[0029]

FIG. 1 shows the principle of the present invention. In the figure, 1, 2, ..., N are antennas, respectively. Each antenna 1, 2, ..., N receives the same wave, which signals S _1, S _2, ..., the phase correction means 30 _1, 30 ₂ as S _N, ..., and outputs it to 30 _N.

Each of the phase correcting means 30 ₁ , 30 ₂ ,..., 30
_N have the same configuration, and all the same reference signals Sd, Sd,... Generated from the reference signal generating means 33 are input, and the signals S ₁ , S ₁ ,. The correction for adjusting the phases of S ₂ ,..., S _N is performed.

Numeral 34 is a signal synthesizing means for synthesizing and outputting the corrected signals output from the phase correcting means 30 ₁ , 30 ₂ ,..., 30 _N.

Each of the phase correction means 30 ₁ , 30 ₂ ,
.., 30 _N are preferably means for detecting phase information of a signal received by the antenna, means for taking the difference between the phase based on the phase information and the phase of the reference signal, and outputting the difference. Means for changing the phase of the signal received by the antenna.

Further, each of the phase correction means 30 ₁ , 30 ₂ ,
, 30 _N may be formed as one panel.

[0034]

According to the present invention described above, the phases of the signals S _{1 to} S _N from the antennas 1 to N are converted by the phase correction means 30 ₁ to 30 _{N of} the same configuration into the reference signal from the reference signal generation means 33. Since the phase can be adjusted to the phase of Sd, the entire circuit can be realized with a simple configuration.

Further, each phase correcting means 30 ₁ to 30 _N,
If each panel is formed as one panel, an arbitrary number of multi-plane antennas can be easily configured because a panel having the number of antennas may be used.

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

The reason why one panel can be provided is that signal correction can be performed for each of the phase correcting means 30 ₁ to 30 _N , and that the same phase is corrected.

[0038]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing a configuration of a space diversity in-phase combining circuit according to one embodiment of the present invention. The circuit shown in this figure shows an in-phase synthesizing circuit in a one-multicarrier system having a three-plane antenna configuration, similarly to the conventional example shown in FIG. And description thereof is omitted.

In FIG. 2, 1, 2 and 3 denote first to third antennas, 30, 31 and 32 denote first to third phase correctors,
3 is a reference signal generator, and 34 is a synthesizer.

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

The reference signal generator 33 includes a phase corrector 30 to
32, a reference signal Sd for correcting the phases of the signals Sa, Sb, Sc is output.
5 and a branching device 36. The oscillator 35
A signal having a phase suitable for correcting the phase of each signal Sa, Sb, Sc is generated. The splitter 33 divides the power of the signal output from the oscillator 35 into three and outputs each as a reference signal Sd.

Further, the synthesizer 34 includes the phase correction units 30 to
The signals output from the 32 branching devices 5 are combined and output as an output signal So.

The operation when the radio wave S is received by the antennas 1, 2, 3 in the space diversity in-phase combining circuit having such a configuration will be described.

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

In the automatic gain control amplifier 9, phase information is detected from the input control signal, and this is output to the mixer 12. That is, the phase information of the signal Sa is
Will be output to

On the other hand, the mixer 12 includes the reference signal generator 3
3 receives the reference signal Sd, the mixer 12 calculates the phase difference between the signal Sa and the reference signal Sd, and outputs the phase difference to the infinite phase shifter control circuit 16.

In the infinite phase shifter control circuit 16, a sine signal SS or a cos signal CS corresponding to the phase difference is generated and output 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 cos signal CS and output to the splitter 5.

That is, 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-branch device 5-automatic gain control amplifier 9-mixer 12-infinite phase shifter control circuit 16-infinite phase shifter 14 repeats the control of changing the phase of signal Sa, thereby repeating the phase of signal Sa. Are in phase with the phase of the reference signal Sd.

Then, the signal Sa output from the splitter 5 in phase with the reference signal Sd is output to the synthesizer 34.

The signal Sb from the second antenna 2 is input to the second phase corrector 31. Then, similarly to the above-described phase correction of the signal Sa by the first phase correction unit 30, the phase of the signal Sb is changed by the second phase correction unit 31 to the reference signal Sd.
And output to the synthesizer 34.

Similarly, in 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 unit 32 and is output to the combiner 34.

The combiner 34 combines the signals Sa, Sb, Sc having the same phase as that of the reference signal Sd, and outputs this as an output signal So.

As described above, according to the space diversity in-phase combining circuit of the present invention, the phases of the signals Sa, Sb, Sc received by the antennas 1 to 3 are adjusted by the phase correction units 30 to 32 of the same configuration. , The reference signal Sd output from the reference signal generator 33 is corrected to have the same phase as the reference signal Sd, and the corrected signals Sa, Sb, Sc are combined by the synthesizer 34.
Thus, the circuit can be composed and output, so that the entire circuit can be easily configured.

Further, each of the phase correction units 30, 31, 32 is set to 1
Since the reference signal Sd may be input to each panel in the same manner, the adjustment between the panels, which is conventionally troublesome, is facilitated.

Further, 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 of the phase correction units 30 to 32. it can.

The above-described space diversity in-phase combining circuit is an in-phase combining circuit in a one-multi-carrier system having a three-surface antenna configuration. A splitter for dividing one signal into three is interposed between the corrector and the phase corrector, and a phase corrector is connected to each of the three output terminals of the splitter, and the reference signal Sd is input to each phase corrector. Finally, the corrected signals may be combined in three ways.

That is, even when a multi-surface antenna is used, the circuit can be easily configured.

[0059]

As described 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 way, there is an effect that the entire circuit configuration can be simplified.

Further, since a circuit for correcting the phase of a signal received by one antenna can be formed by one panel, there is an effect that it is possible to easily cope with a multi-plane antenna configuration.

Furthermore, since it is sufficient to input a reference signal having the same phase as a reference for performing phase correction between the panels, even when an entire circuit is formed using a large number of panels, the delay time between the panels and the like can be reduced. There is an effect that adjustment is easy.

[Brief description of the drawings]

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

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

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

[Explanation of symbols]

1, 2, ..., N antennas _{30 1, 30 2, ...,} 30 N phase correcting means 33 reference signal generating means 34 signal combining means S _1, S _2, ..., signals received by S _N antennas 1~N Sd reference signal

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H04B 7/00 H04B ⁷ /02-7/12 H04L 1/02-1/06

Claims (2)

(57) [Claims] 1. The phase of each signal (S ₁ , S ₂ ,..., S _N ) received by a plurality of antennas (1, 2,..., N) is corrected to the same phase, and In a space diversity in-phase combining circuit for combining and outputting signals, a reference signal generating means (33) for generating a reference signal (Sd) and a phase of each of the signals (S ₁ , S ₂ ,..., S _N ) , The reference signal (S
A plurality of phase correction means (30 ₁ , 3
0 ₂ ,..., 30 _N ) and the corrected signal output from the plurality of phase correction means (30 ₁ , 30 ₂ ,..., 30 _N ).
4) , wherein the plurality of phase correction means (30 ₁ , 30 ₂ ,..., 30 _N )
Means for detecting the phase information of the signal received at
The difference between the information phase and the phase of the reference signal is calculated.
Means for receiving and, according to the difference, received by the antenna
A space diversity in-phase combining circuit , comprising: means for changing a phase of a signal . 2. The signal received by a plurality of antennas (1, 2,..., N).
The phases of the respective signals (S ₁ , S ₂ ,... S _N ) are corrected to the same phase, and
Space diver that combines and outputs each phased signal
In cytidine-phase combining circuit, a reference signal generating means for generating a reference signal (Sd) (33), each of said signals _{(S 1, S 2, ...} , S N) phase of the reference signal (S
A plurality of phase correction means (30 ₁ , 3
0 _2, ..., and 30 _N), is output from the plurality of phase correcting means _{(30 1, 30 2, ...} 30 N)
A signal synthesizing unit (3) that synthesizes and outputs the corrected signal.
4), and each of the plurality of phase correction means (30 ₁ , 30 ₂ ,..., 30 _N )
A space diversity in-phase synthesis circuit characterized by being formed into one panel .