JPH0779284B2 - Dual polarization transmission method and dual polarization transmission device using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses both vertical and horizontal polarized waves, and when there is a failure in any working line, the working line is switched to a protection line to repair the failed line. The present invention relates to a dual polarization transmission system and a dual polarization device using the same.

[0002]

2. Description of the Related Art Generally, this type of dual polarization transmission device uses both vertical and horizontal polarizations, and uses a plurality of working radio lines (hereinafter simply called working lines) corresponding to each polarization. This configuration reduces the influence of polarization fading.

However, in the case of dual polarization transmission, U / C
ASIRAGI et al, 14O MBIT
/ S 32QAM CROSS-POLARIZED
CO-FREQUENCY TRIAL RESULT
SICC92 (350.4-1-4-5 / PP14
93-1497), the probability of fading both polarizations simultaneously becomes very high. Therefore, in such a case, it is effective to provide two backup lines because one backup line cannot be relieved.

As described above, as a configuration provided with one protection line for each polarization, that is, as a dual polarization transmission device using two protection lines, a structure as shown in FIG. 2 is inferred.

This dual polarization transmission device has two systems of digital radio devices corresponding to vertical and horizontal polarizations.
In addition to multiple working lines, the digital radio equipment of each system
Transmission is performed using a single backup radio line (hereinafter, simply called a backup line). Here, the number of working lines is N [however, N
Is a natural number, and here it is assumed that N = 7], a total of 2 × (1 + N) wireless lines are used. In this way, both polarization transmission devices are composed of two digital radio transmission devices that are independent for each polarization and are each equipped with a protection line.

More specifically, the two independent digital radio devices are provided with 2N line switchers 1 to 2N and 2N + 1 to 4N on the transmitting end side and the receiving end side, respectively, while each of them has a single line switching device. It has one spare line. With this configuration,
2N line switchers 1 to 2N are provided on the sending end side of the two systems, and 2N + 1 to 4N are provided on the receiving end side, and these sending end side and receiving end side lines are independently provided. It is considered that a configuration that reduces the influence of fading by switching the line switch will be adopted.

Next, referring to FIGS. 2 and 3 together, the above-mentioned dual polarization transmission will be described more specifically. Incidentally, FIG. 3 shows a radio frequency arrangement used in the dual polarization transmission device shown in FIG. In this radio frequency arrangement, the horizontally polarized pilot signal is represented as PROT and the vertically polarized signal is represented as PROT ', and the working line signals in the horizontally polarized wave are REG1 to 7, and the vertically polarized signal is REG1.
It is shown as'-7 '.

As shown in FIG. 2, both polarization transmission devices are provided with digital radio transmission devices corresponding to the two polarizations, respectively, and the line switch 2N + 1 described above is provided at the receiving end of these two transmission devices. ~ 3N, 3N + 1 ~ 4N, in addition to monitoring the line quality in the line corresponding to these line switch,
As a result of the monitoring, line alarm detectors 1 ′ to 2N ′ that detect a line alarm for a line in a deteriorated state are provided.

Of the line alarm detectors 1'-2N ',
Line alarm detector 1'for one digital wireless device
N'can be transmitted to the line switching information generator 106 and the line alarm detectors N '+ 1 to 2N relating to the other digital radio device.
'Is configured to be transmitted to the line switching information generator 106'.

On the other hand, on the sending end side, the line switches 1 to N, N
Line switching control devices 105 and 105 'for transmitting switching control signals to +1 to 2N are provided.

In addition, the line switches 1 to N, 2N + 1 to 3N in one of the digital radio devices can communicate the pilot signal generated by the pilot signal generator 101, and the communication result is detected by the pilot signal detector 103. To be done. Regarding the other digital radio equipment, the line switches N + 1 to 2N and 3N + 1 to 4N can communicate the pilot signal generated by the pilot signal generator 102,
The communication result is detected by pilot signal detector 104.

Although the two digital wireless devices shown in FIG. 2 have been described as N = 7, for the sake of convenience, each digital wireless device is configured with the same polarization of the horizontal and vertical polarizations. , The line of the same radio frequency is shown by the same line number.

Next, a line switching operation in this digital radio apparatus will be briefly described. However, the description will be given only for one digital wireless device (N = 7, including line switchers 1 to N and 2N + 1 to 3N), and description of the other digital wireless device will be omitted. When all working lines are normal in the initial state, none of the working lines is switched to the protection line on the sending end side, so that the pilot signal generated by the pilot signal generator 101 is switched from the line switches 1 to N. 2N + 1 to 3N. In this case, on the receiving end side, the pilot signal is detected by the pilot signal detector 103 and none of the working lines is switched to the protection line, that is,
Judge that all working lines are normal and standby lines are also normal.
After this, the switching control signals (CONT1 to CONT1) of the horizontally polarized waves REG1 to 7 as shown in FIG.
n) to the line switches 1 to N.

Here, for example, fading as shown in FIG. 4 (abnormality of electric field strength due to time change in medium)
Occurs on the working line (REG2) connected to the line switch 2 and an error occurs on the line. In this case, the line alarm detector 2'on the receiving end detects the error, and when the error detection value exceeds a preset threshold value, the line alarm (ALM2) is transmitted to the switching information generator 106.

The switching information generator 106 has its line alarm (A
The line switching information is generated based on LM2), and the line switching information is transmitted to the line switching control device 105 on the sending end side using the wireless line in the sending end side direction. Line switching control device 10
5 receives the line switching information, the switching control signal (CON
T2), the line switch 2 is operated to switch the working line (REG2) to the protection line, and the working line (REG
2) Transfer the above signal to the protection line.

On the other hand, on the receiving end side, the pilot signal detector 103 detects that the pilot signal has disappeared, that is, that any working line has been switched on the transmitting end side. Upon receiving the detection signal and the response signal from the receiving end, the switching information generator 106 transmits the line switching signal b to the line switching device 2N + 2 of this working line (REG2). Upon receiving this line switching signal b, the line switching device 2N + 2 detects the phase difference between the signals and switches to the protection line side when the signals are in agreement, and rescues. In this way, all operations are completed. Note that, for example, even when fading occurs on the working line 2 '(REG2') side, relief is performed by exactly the same operation.

[0017]

In the case of the above-mentioned dual polarization transmission system, two completely independent digital radio equipments are provided with two protection lines, respectively, so as to individually and independently take countermeasures against a line failure due to fading. ing. In this way, when the line fault countermeasures are individually applied to the independent digital wireless devices, the entire configuration becomes complicated.

Further, when the two digital radio devices are individually controlled to take countermeasures against a line failure, redundant line switching control and line switching information are required respectively, resulting in poor frequency utilization efficiency. There is a problem.

The present invention has been made to solve the above problems, and its technical problem is to provide a dual polarization transmission system and a dual polarization transmission system using the dual polarization transmission system which can easily improve the frequency utilization efficiency of the dual polarization transmission. It is to provide a wave transmission device.

[0020]

According to the present invention, there are provided two line groups each having a transmitting end side and a receiving end side, and each of which has a plurality of working lines and protection lines between the transmitting and receiving end sides. In a dual-polarization transmission method in which signals are transmitted using different polarizations in the system, the transmission end side uses the line switching information for the protection line of either one of the two working lines The corresponding working line of the system is switched to the protection line at the same time, and on the receiving side, the line quality of the two working lines is monitored and detected, so that the line alarm related to the degraded line is one of the working lines. From the above, a dual polarization transmission system can be obtained in which not only one working line of one system but also the corresponding working line of another system is switched to the protection line based on the line alarm.

Further, according to the present invention, a line group of two systems each including a plurality of working lines and protection lines is provided between the transmitting end side and the receiving end side, and different polarizations are used for both systems. In a dual-polarization transmission device that transmits a signal by transmitting a signal, the transmission end side is provided corresponding to two working lines, and a plurality of line switching devices that switch the working lines of the corresponding systems to protection lines and two lines Connected to multiple line switches in
The line switch in the system is equipped with a line switching control device that simultaneously switches the corresponding working line of the other system to the protection line when switching from the working line to the protection line, and the receiving end side has two working lines. It is provided corresponding to
A line alarm means for outputting a line alarm for a line in a deteriorated state obtained by monitoring and detecting the line quality of each of a plurality of line switches, and a line alarm from any one of the working lines when receiving a line alarm And a line switching information generating means for outputting line switching information for instructing to switch the corresponding working line to the protection line.

Further, according to the present invention, in the above-mentioned dual polarization transmission device, the line switching control device on the sending end side and the line switching information generating means on the receiving end side are both polarizations connected to each other through a wireless line. A transmission device is obtained.

[0023]

In the dual polarization transmission device according to the present invention, the two digital radio devices forming the two spare radio paths are not completely independent, and the two digital radio devices are connected to each other at the transmission end side. The line switching control device for switching control to the protection line and the switching information generator for transmitting the line switching information to the transmission side on the receiving side are shared. The line switching control device generates a switching signal relating to either horizontal or vertical in each polarization plane among a plurality of line switching devices on the transmission end side based on one line switching information. Switch to the protection line at the same time. The switching information generator generates one piece of line switching information based on a line alarm regarding a line in a degraded state obtained by monitoring and detecting the line quality of each line corresponding to a plurality of line switches on the receiving end side. The one line switching information is transmitted to the line switching control device on the sending end side through a radio line which is either horizontal or vertical in the plane of polarization.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The dual polarization transmission apparatus of the present invention will be described in detail below with reference to the accompanying drawings.

First, an outline of the dual polarization transmission device of the present invention will be briefly described. This both-polarized wave transmission is provided with 2N [where N is a natural number] switching means on each of the sending end side and the receiving end side, and the 2N switching means can be divided into two systems of N pieces each. it can. Further, each system is provided with N working lines, and each system is provided with one protection line. The switching from the working line to the protection line is performed by switching N switching means of each system.

At the transmitting end, two switching systems are generated by generating switching signals for either the horizontal or the vertical in each polarization plane among the 2N switching means based on one line switching information. Switch the line to the protection line at the same time. Further, on the receiving end side, after detecting the line quality of each of the lines corresponding to the 2N switching means, a line alarm regarding a line in a deteriorated state is obtained, and then one line switching information is sent based on this line alarm. The information is generated, and this one line switching information is transmitted to the transmission end side by the radio line which is either horizontal or vertical in the plane of polarization.

FIG. 1 is a block diagram showing a digital radio apparatus using this dual polarization transmission. The illustrated dual polarization transmission device comprises two digital radio devices,
2N line switches 1 and 2 on the sending end side and the receiving end side respectively
N, 2N + 1 to 4N are provided, and these line switching devices have 2
The working line of the system and the protection line individually provided for each system are accommodated. In addition, switching from the working line to the protection line is performed by each of these 2N line switchers 1 to 2N and 2N.
It is performed by switching two line switching devices from +1 to 4N.

Here, the line switch 2N + 1 is provided on the receiving end side.
.About.3N, 3N + 1 to 4N, and line alarm detectors 1'to 2N 'are provided for detecting a line alarm for a line in a degraded state by monitoring the respective line qualities. Further, these line alarm detectors 1'-2
N ′ sends a line alarm to the line switching information generator 106. The transmission end side is provided with a line switching control device 105 for transmitting a switching control signal to each of the line switching devices 1 to 2N.

In addition, in one digital radio equipment, the line switches 1 to N and 2N + 1 to 3N can communicate the pilot signal generated by the pilot signal generator 101, and the communication result is detected by the pilot signal detector 103. To be done. In the other digital radio equipment, the line switches N + 1 to 2N and 3N + 1 to 4N can communicate the pilot signal generated by the pilot signal generator 102, and the communication result is detected by the pilot signal detector 104.

That is, the two digital radio devices shown in FIG. 1 also correspond to the case of N = 7, as in the case shown in FIG. Also, in FIG. 1, for the sake of convenience, each digital radio apparatus is configured with the same polarization of the horizontal and vertical polarizations, and, as in FIG. 3, lines of the same radio frequency are indicated by the same line number.

Of these, the line switching control device 10 on the sending end side
Reference numeral 5 generates a switching control signal for either the horizontal or the vertical in each polarization plane among the 2N line switching units 1 to 2N based on one line switching information. As a result, the line switching control device 105 controls the corresponding line of the 2N line switching units 1 to 2N to be simultaneously switched to the protection line by the switching control signal.

Further, 2N line alarm detectors 1'on the receiving end side
.About.2N 'detects a degraded line by monitoring the line quality of each of the lines corresponding to the 2N line switchers 2N + 1 to 4N, and sends a line alarm. Furthermore,
The line-switching information generator 106 on the receiving end side generates one line-switching information based on the line alarm, and outputs this one line-switching information to a wireless line (transmission thereof) related to either horizontal or vertical plane of polarization. (Direction side) to the line switching control device 105 on the sending end side.

In these two digital radios,
Line switching control device 105 and line switching information generator 106
Are shared between digital wireless devices.

Next, the line switching operation in this digital radio apparatus will be described. However, the description is directed to both digital wireless devices (N = 7).
The process of detecting the state of the protection line by detecting the pilot signal in the initial state is the same as that of the conventional apparatus described with reference to FIG.

Here, it is assumed that fading as shown in FIG. 4 occurs in the working line (REG2). When fading occurs in the working line (REG2), fading also occurs with a very high probability in the working line (REG2 ') using different polarizations, as described in the above-mentioned reference paper. Therefore, the line alarm detector 2,
Line alarm from either N + 2 '(ALM2 or ALM
2 ') will be transmitted. Line switching information generator 1
When receiving the earlier line alert, 06 transmits one line switching information generated based on this line alert to the line switching control device 105 from the transmission direction side of the wireless line. When the line switching control device 105 receives the one line switching information, the two line switching control signals (CONT2, 2).
′) Is transmitted to the line switch 2 and N + 2, respectively. As a result, the line switches 2, 3N + 2 can be operated to transfer the signals of the working lines (REG2, REG2 ') to the protection line.

After this, as in the case described with reference to FIG.
On the receiving end side, the pilot signal detectors 103 and 104 detect that the pilot signal has disappeared, that is, that both working lines (REG2, REG2 ') have been switched on the transmitting end side. The switching information generator 106, which has received this detection signal and the response signal from the receiving end side, uses the line switching devices 2N + 2, 3N of these working lines (REG2, REG2 ').
The line switching signal b is transmitted to +2 respectively. The line switching devices 2N + 2 and 3N + 2 are connected to the line switching signal b.
When the signal is received, the phase difference between the signals is detected, and when they match, the signal is switched to the protection line side to perform rescue. In this way, all operations are completed.

[0037]

According to the dual polarization transmission system of the present invention and the dual polarization transmission device using the dual polarization transmission system, the transmission is performed between two digital radio devices which form two backup radio paths. One line switching control device and one line switching information generator share the line switching control for the backup line and the line switching information transmitted from the receiving side to the sending side, and the line switching information is used by one wireless line. As a result, frequency utilization efficiency is significantly improved. In addition, the digital radio device for transmitting both polarizations has a simple structure because one line switching control device and one line switching information generator are reduced compared to the conventional one.

[Brief description of drawings]

FIG. 1 is a block diagram showing a dual polarization transmission device according to an embodiment of the present invention.

FIG. 2 is a block diagram for explaining a configuration of a dual polarization transmission device that can be inferred from a conventional technique.

FIG. 3 shows an example of a radio frequency arrangement related to dual polarization transmission.

FIG. 4 shows a state in which fading occurs in the radio frequency arrangement shown in FIG.

[Explanation of symbols]

1-4N (N = 7: 1-28) Line switcher 1'-2N '(N = 7: 1'-14') Line alarm detector 101,102 Pilot signal generator 103,104 Pilot signal detector 105 , 105 'Line switching control device 106, 106' Line switching information generator

Claims (3)

[Claims] 1. A transmission line side and a reception side, and two line groups each consisting of a plurality of working lines and protection lines are provided between the transmission and reception sides, and different polarizations are used for both lines. In the dual polarization transmission method for transmitting a signal by transmitting the signal, the transmission end side determines the corresponding working line of the other system based on the line switching information for the protection line of either one of the two systems of the working line. At the same time, the standby line is switched to, and at the receiving end, a line alarm relating to a line in a degraded state can be obtained from any one of the working lines by monitoring and detecting the line quality in the plurality of working lines of the two systems. A dual polarization transmission method characterized in that not only the working line of the one system, but also the corresponding working line of the other system is switched to the protection line based on the line alarm. 2. A line group of two lines each comprising a plurality of working lines and protection lines is provided between the sending end side and the receiving end side,
In a dual polarization transmission device that transmits signals using polarizations different from each other in the two systems, the transmission end side is provided corresponding to the two system working lines, and the corresponding system working lines are spared. A plurality of line switchers for switching to a line and a plurality of line switchers of the two systems are connected to the line switcher in one system when switching from the working line to the standby line,
And a line switching control device for simultaneously switching and controlling the corresponding working line of the other system to the protection line.
Line alarm means provided corresponding to the working line of the system and outputting a line alarm for the line in a deteriorated state obtained by monitoring and detecting the respective line qualities of the plurality of line switching devices; When a line alarm is received from any of the working lines, a line switching information generating means for outputting line switching information for instructing to switch the corresponding working line of the other system to the protection line is also provided. Dual polarization transmission device. 3. The dual polarization transmission device according to claim 2, wherein the line switching control device on the sending end side and the line switching information generating means on the receiving end side are connected to each other through a wireless line. Characteristic dual polarization transmission device.