JPS6223642A - Frequency synchronizing system - Google Patents

Abstract

PURPOSE:To simplify constitution and to improve the reliability by having only to provide an oscillation circuit respectively to H and V side reference signal generating sections in a radio communication equipment in common use for a polarized wave so as to adopt the standby of 1:1 oscillation circuit. CONSTITUTION:The generation section 1 is used as a master set and the generation section is designated as a slave set in V and H side reference signal generating sections 1, 2. When both crystal oscillators 11, 21 are normal, control circuits 14, 24 throw the connection of switches 13, 23 to the connection shown in solid lines. Then an oscillation signal 201 is terminated by a terminator terminating one terminal of switches 13, 23 via a hybrid 22 and an oscillator 21 is used as a standby set. If abnormal oscillation takes place in the slave side oscillator 21 and an alarm signal 202 is sent, the control circuit 24 informs it to the control circuit 14 via a signal line 100. In this case, the connection of the switches 23, 24 is unchanged. If the oscillator 11 of the master set has abnormal oscillation, the control circuit 14 informs it to the control circuit 24. Thus, the control circuits 14, 24 throw the connection of the switches 13, 23 to the position as shown in dotted lines and an output of the normal oscillator 21 is outputted as reference signals 103, 203.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a frequency synchronization method, and in particular, in a polarization sharing wireless communication device, the transmitting station oscillation frequency or the receiving station oscillation frequency corresponding to each polarization is mutually synchronized. This invention relates to a frequency synchronization method for synchronization.

[Conventional technology]

Due to the degree of separation between two mutually orthogonal polarizations (eg, vertical polarization and horizontal polarization), polarization sharing, which transmits two pieces of information at the same frequency, is a rounding off of the efficient use of frequencies.

In such a polarization-sharing wireless communication device, in order to make the frequencies of the two polarized waves the same, it is necessary to synchronize the transmitting station oscillation frequency or the receiving station oscillating frequency corresponding to each polarized wave.

The conventional frequency synchronization method includes a reference frequency oscillator for each wave, one of which is frequency synchronized with the other, and each reference frequency oscillator 5a? A method was used to control the transmitting station oscillating frequency wave or the receiving station oscillating frequency wave corresponding to each polarized wave using the iI power.

[Problem to be Solved by the Invention 3] As explained above, the conventional frequency synchronization method requires at least two reference frequency oscillators and one frequency synchronization circuit, and in order to improve reliability, these It has the disadvantage of being large in number and expensive, since everything requires separate spares.

An object of the present invention is to provide a frequency synchronization method that is economical and does not impair reliability.

[Means for Solving Problem C] The frequency synchronization method of the present invention is based on the frequency synchronization system of two transmitting stations of a wireless communication device that transmits two signals using two polarized waves that are orthogonal to each other and have the same frequency. Or, in a frequency synchronization method that synchronizes the oscillation frequencies of two receiving stations, one of them becomes the master and the other becomes a slave depending on the master/slave designation signal, and the transmission @ full frequency ripple is not yet the receiving station. Two reference frequency generating sections having the same configuration each outputting a reference signal serving as a reference for the oscillation frequency are provided, and one of the two reference frequency generating sections outputs an oscillation signal having the same frequency as the base signal. an oscillation circuit that outputs an alarm signal when the oscillation signal is abnormal; a branch circuit that branches the oscillation signal into two and outputs one of them to the other of the reference frequency generation section; In front of the two reference frequency generators
a switching circuit that selects one of the outputs of the C branch circuit and outputs it as the reference signal, and generates the control signal and output signal from the master/slave designation signal, the alarm signal, and the input signal. The output signal is configured as the input signal of the control circuit of the other of the two reference frequency generators.

〔Example〕

The present invention will be described in detail below with reference to drawings showing embodiments.

FIG. 1 is a block diagram showing an embodiment of the frequency synchronization method of the present invention.

In the embodiment shown in FIG. 1, the vertical polarization & (abbreviated as V) side reference signal generating section 1 and the horizontal polarization (abbreviating as H) side reference signal generating section 2 have the same configuration. Each component block/signal having the same number in its digits is the same.

The V-side base single signal generator 1 includes a crystal oscillator 11 that outputs an oscillation signal 101 and an alarm signal 102;
a hybrid 12 which branches into two and outputs one of them to the H side group single signal generation section 2, and the other output of the hybrid 12 or the H side group single signal generation section 2 under control of the control signal 105.
Select the output of the hybrid 22 of the reference signal 11.03
a switch 13 that outputs a signal, an alarm signal 102,
The control circuit 14 inputs a designation signal 104 and outputs a control signal 105. The control circuit 14 is H
The side reference signal generating section 20 is connected to the control circuit 24 by a signal line 100.

First of all, both crystal oscillators 11 and 12 successfully oscillate the oscillation signal IQ.
The operation of the embodiment shown in FIG. 1 will be described in the case where the alarm signal 1, 201 is output and the alarm signal 1, 202 is not output.

By designation signals 1.04 and 204 inputted from the outside (for example), the control circuit 14 designates the V-side group single signal generation section 1 as the master, and the control circuit 24 designates the H-side group single signal generation section 2 as the slave. If specified in this way, control circuit 1
4.24 is the switch 13 by the control signal 105°205
．． 23 is connected as shown by the solid line. Therefore, the output of the crystal oscillator 11 is the hybrid 12 switch 1
The signal is outputted as a reference signal 103 via the hybrid 12/switch 23, and is outputted as the reference signal 203 via the hybrid 12/switch 23. The reference signals 103 and 203 serve as a reference for the transmitting station oscillation frequency on the V side and the H side as well as the receiving station oscillation frequency. On the other hand, the oscillation signal 201 is terminated via the hybrid 22 at a terminator that terminates one terminal of the switch 13.23, and the crystal oscillator 21 becomes a standby.

If the master/slave designation is reversed, the output of the crystal oscillator 21 becomes the reference signal 103.203, and the crystal oscillator 11 becomes a standby signal.

Next, the operation of the embodiment shown in FIG. 1 will be described in the case where the crystal oscillator 11 or 21 becomes abnormal in oscillation and outputs the alarm signal 102 or 202. It is assumed that the V-side base single signal generation section 1 is designated as the master, and the H-side reference signal generation section 2 is designated as the slave.

When the crystal oscillator 21 on the slave side becomes abnormal in oscillation,
Control circuit 24 detects this through alarm signal 202 and notifies control circuit 14 of this via signal line 100. At this time, the switch 13 by the control circuit 14.24
．． 23 remains unchanged, and the switch 13.23 continues to output the input from the normal crystal oscillator 11.

When the crystal oscillator 11 on the master side becomes abnormal in oscillation,
Control circuit 14 detects this via alarm signal 102. Furthermore, the control circuit 14 notifies the control circuit 24 of the oscillation abnormality of the crystal oscillator 11 via the signal line 100 after confirming that information from the control circuit 24 that notifies the crystal oscillator 21 of an oscillation abnormality is not input. do. When the above operations are completed, the control circuit 14.24 switches to the switch 13.23.
Make the connections shown in dotted lines. Therefore, the output of the normal crystal oscillator 21 is output as the reference signal 103,203. When the oscillation abnormality of the crystal oscillator 11 is recovered and the alarm signal 102 disappears, the control circuit 14.24 returns the switch 13.23 to the original connection (shown by a solid line), and the output of the crystal oscillator 11 becomes the reference signal 103, 203, and the crystal oscillator 21 returns to the standby mode.

Although one embodiment of the present invention has been described above, the reference signal may be the transmitting station signal itself or the receiving station signal itself.

〔Effect of the invention〕

As explained in detail above, the frequency synchronization method of the present invention is
There is no need for a frequency synchronization circuit, but just by providing two oscillation circuits, there is a one-to-one rooting circuit reserve, so there are fewer components, making it economical and highly reliable. Since the two reference frequency generators have exactly the same configuration, productivity is improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the frequency synchronization method of the present invention. 1...V side reference signal generation section, 2...H
Side reference signal generation section, 11.21...Crystal oscillator, 12.22...Hybrid, 13.23.
...Switch, 14゜24...Control circuit

Claims (1)

[Claims] Frequency synchronization that mutually synchronizes two transmitting station oscillating frequencies or two receiving station oscillating frequencies of a wireless communication device that transmits two pieces of information using two polarized waves that are orthogonal to each other and have the same frequency. In this method, one of the reference frequency generators has the same configuration, in which one becomes the master and the other becomes the slave according to a master/slave designation signal, and each outputs a reference signal that serves as a reference for the transmitting station oscillation frequency or the receiving station oscillation frequency. One of the two reference frequency generating sections includes an oscillation circuit that outputs an oscillation signal of the same frequency as the reference signal and outputs an alarm signal in the event of an oscillation abnormality, and an oscillation circuit that branches the oscillation signal into two and outputs an alarm signal when the oscillation is abnormal. a branch circuit that outputs one of the two reference frequency generators to the other of the two reference frequency generators, and an output of one of the branch circuits of the two reference frequency generators that is controlled by a control signal and is output as the reference signal. a switching circuit;
a control circuit that generates the control signal and the output signal from the master/slave designation signal, the alarm signal, and the input signal; A frequency synchronization method characterized by using an input signal.