JPH02186729A - Extending method for no-hit radio channel - Google Patents

Abstract

PURPOSE:To reduce a cost at the time of new installation, to considerably reduce deviations between the transmission loss of respective channel branching filters at the time of extension and to extend no-hit radio channels by providing LPF on a transmission side branching filter and a reception side branching filter. CONSTITUTION:LPF 41 and LPF 42 are provided on the transmission side branching filter 100T and the reception side branching filter 100R at the time of new installation. In such a case, LPF 41 and LPF 42 allow the radio channels CH1-CHm which are used at the time of new installation, to pass through, but they interrupt future extension channels CHm+1 and CHn. At the time of extending the remaining channels CHm+1 and CHn, circulators 2(m+1) and 2n having the filters 1(m+1) and 1n of the branching filters of the extension channels are connected in an opposite order irrespective of the circulators 21, 22 and 2m of the branching filters of the channels of the time of new installation, and a terminal resistor R is connected so as to attain termination. Thus, cost at the time of new installation can be reduced, the deviations between the transmission loss of respective channel branching filters can be reduced at the time of extension to extend the no-hit radio channels.

Description

[Detailed Description of the Invention] [Summary] Regarding an uninterrupted wireless channel expansion method for expanding wireless channels of a multiplex wireless relay device without interrupting signal transmission and reception, The purpose of this technology is to minimize the deviation between transmission losses and enable the expansion of wireless channels without any interruptions. In a wireless channel demultiplexer consisting of a circulator and a channel common circulator, when the wireless channel demultiplexer is newly installed, the signals for the used channels are passed between the common circulator and the circulators of the last and first channels of the used channels. However, a low-pass filter is installed to cut off the signals for the remaining expansion channels, and when adding the remaining channels, the terminating resistor of the common circulator is temporarily removed and a circulator with filters for each channel of the duplexer of the expansion channels is installed instead. The configuration is such that the sending and receiving sides are connected in the opposite order and then terminated.

[Industrial application field]

The present invention relates to a multiplex radio relay device, and more particularly to a method for adding wireless channels in a multiplex radio relay device without interrupting signal transmission and reception.

[Prior Art] As shown in FIG. 3, the conventional wireless channel expansion method without momentary interruption uses a channel-specific filter BPF that multiplexes or separates a plurality of wireless channels on the transmitting side and the receiving side of a multiplex wireless relay device.
+-IIPh and circulator CIR.

~C[R:I and the channel common circulator CIRo with improved impedance characteristics are used for both the transmitting side duplexer 100T and the receiving side duplexer 100m. The last channel C113 of the wireless channels C111 to C113 in use
Remove the terminating resistor R of circulator CIR:+ and connect the remaining expansion channel C! 14 and 0115 filter old) F4
, circulator CIR, and filter [lf'Fs and circulator ClR5 are connected in the same order as shown in the figure, and circulator ClR5 is terminated. ■ When installing a new multiplex radio device, only the duplexers for channels 0111 to C113 are used. Instead, there are two ways to equip the system with branching filters for future expansion channels CIl 4° and C1!5, which are indicated by dotted lines in Figure 3.

[Problem to be solved by the invention]

However, in method (2), since the channel-specific circulators CIR+""ClR5 are sequentially cascaded in the same order on the transmitting side and the receiving side, the deviation between the transmission loss of each channel demultiplexer increases depending on the number of cascades. There's a problem.

In method (2), not only the branching filters for the used channels but also the branching filters for the channels to be added in the future are installed at the time of new installation, so in addition to the above problem, there are 6 other problems such as high initial cost. . An object of the present invention is to reduce the cost when newly installed, minimize the deviation between the loss of one transmission member of each channel duplexer when expanding, and enable wireless channel expansion without momentary interruption.

[Means to solve the problem]

This problem can be solved by referring to FIG.
1 and the circulator 2m of the last channel C11- of the used channels CIl l to C1l m, on the receiving side, the common circulator 32 and the used channels 0111 to C1
Circulator 2 of first channel C111 of l ta
1, while the signals for the used channels are passed through, but the signals for future expansion channels are passed through CI+1.1. ．． Low-pass filters 41 and 42 are provided to block the signal of Cl1n, and when adding the remaining channels Cl11m+Ctln, the terminating resistor R of the common circulator 31°32 is temporarily removed, and the filter 1m+ of the branching filter of the added channel is used instead. , ln, the circulator 2m+1.20 is connected to the transmitting side 1007 and the receiving side 10.
This problem is solved by the present invention, which is configured to connect 0R in the opposite order and then terminate with a terminating resistor R.

The first diagram showing the configuration of the uninterrupted wireless channel expansion method of the present invention.
In the principle diagram shown in the figure, 11.12,1m is the radio channel Cll1. C1l
2. This is a channel-specific bandpass filter for the C1l m branching filter, and is used when newly installed.

1g+*t+1n is a band-pass filter of a duplexer for the wireless channel Cl1m+++cIln used at the time of expansion.

21.22.2m is the wireless channel Cll used at the time of new installation.1. CII 2. This is the output generator for each channel of the Cll m branching filter.

2+a+ 1 + 20 is the wireless channel Cll a+
++cll This is a circulator for each channel of the n branching filter, and is used when expanding.

Reference numeral 31 denotes a circulator common to channels on the transmitting side, to which a terminating resistor R is connected when newly installed.

Reference numeral 32 denotes a circulator common to channels on the receiving side, to which a terminating resistor R is connected when newly installed.

1m+ is the transmitting side channel common circulator 31
and wireless channels C111 and C11 used at the time of new installation.
2. Wireless channel Cll provided between the last channel of cll cm and circulator 2I11 of Cll m and used when newly installed. clI 2. This is a low-pass filter that passes CHta but blocks future expansion channels C1l□t and Cl1n.

42 is a channel common circulator 32 on the receiving side;
Wireless channels C111, C112° C1l used at the time of new installation Wireless channel Cll provided between the circulator 21 of the first channel C111 of m and used at the time of new installation 1. CIl 2. This is a low-pass filter that passes CHta but blocks future expansion channels C11m+, , CHn.

When expanding, the terminating resistor R of the circulator 31 common to the channels on the transmitting side and the terminating resistor R of the circulator 32 common to the receiving side channels are removed and replaced with filters of the branching filters for the additional channels C11, t, and CHn, respectively. 1 @
Circulator 2 a41+2n with 4111',
The transmitting side 100 t and the receiving side 100 m are connected in the opposite order, and on the transmitting side the duplexer 2, of the first channel Cl11+ of the additional channels C11m+, Cl1n. 1, and on the receiving side, the last channel CII n of fin
A terminating resistor R is connected to the curator 2n of the duplexer for termination.

[Actually, the uninterrupted wireless channel expansion method of the present invention is applicable to the wireless channels C111 and C112 IC used at the time of new installation.
) In addition to the III branching filter, the wireless channel C1l used when newly installed 1. Cll2. Cll m is passed through, but future expansion channels CI+, ya, CI! n is a transmitting low-pass filter 41 and a receiving low-pass filter 42 to be cut off, respectively, 100 on the transmitting side and 100 on the receiving side.
The cost at the time of new installation is low because it is only installed at m.

and the remaining radio channels Cll −*+, elf n
When expanding, the wireless channel C1l at the time of new installation 1. clI
2. C1l m branching filter circulator 21.22
．． 2m and extension channel Cll s++
A circulator 21m+2n with a branching filter 11m+1n of +cll n is connected to the husband h1 transmitting side 100? and the receiving side 100a are connected in the opposite order, and the terminating resistor R is connected and terminated, so all wireless channels Cll 1=CI
The increase in transmission loss deviation caused by cascading the circulators of the demultiplexer in the same order in I n is eliminated and equalized, and the problem is solved.

〔Example〕

FIG. 2 is a block diagram showing the configuration of an uninterrupted wireless channel expansion method according to an embodiment of the present invention, in which the wireless frequency is sequentially increased in a microwave system where the total number of wireless channels n is 5 channels. Microwave channel Cl1l-
Among C15, C111 to C113 are used when newly installed,
C1l left behind 4. This is an example of adding CH5.

In the block diagram of FIG.
t are both set between channel CH3 and channel C114, and when newly installed, transmitting side duplexer 100. and receiving side duplexer 1
00N respectively.

Channels C111 to C113 are low-pass filters 41
Since the passband is 42°, the transmitting side 1007 has CIl
The microwave transmission signal of l-C113 undergoes some passing loss in the low-pass filter 41 and is sent to the transmission antenna A, and on the reception side 100R, the microwave reception signal of C111 to C113 from the reception antenna ^8 is transmitted. The signal is received by the low-pass filter 42 with some passing loss.

On the other hand, since the extension channels C114 and C115 are in the cutoff band of the low-pass filters 41 and 42, the microwave transmission signals of C114 and C115 are almost totally reflected by the low-pass filter 41 on the transmitting side 1001, and the transmission channels are common. The signal is sent out to the transmitting antenna At via the circulator 31. On the receiving side 100, C1 from receiving antenna 80
l 4. The microwave reception signal of CH5 is substantially totally reflected by the low-pass filter 42, and is received for each channel via the channel common circulator 32 for reception.

The wireless channel expansion method without instantaneous interruption in the embodiment shown in FIG.
In addition to the branching filters H2 and C113, the channel used is C111.
, C112, CI+3, but block future expansion channels C114, C115lit, a transmitting low-pass filter 41 and a receiving low-pass filter 42, respectively.
Since it is only provided on the transmitting side 100 and the receiving side too m, the initial cost I when newly installed can be kept low.

Future wireless channel CI+ 4. When adding C115, the wireless channels C111, C112, C113 at the time of new installation
independent of the circulators 21, 22, 23 of the branching filter and the additional channel C1l 4. Since the circulators 24 and 25 of the C1l 5 branching filter are connected in the opposite order on the transmitting side 100T and the receiving side 100m, and the terminating resistor R is connected and terminated, all wireless channels 0111 after expansion are connected.
~C1!5 There is no increase in the deviation of the transmission loss due to the cascade of the circulators of the duplexers on the transmitting side and the receiving side, and the transmission loss is equalized, so there is no problem.

〔Effect of the invention〕

As explained above, according to the present invention, the initial cost for channel expansion at the time of new installation is low, and after the channel expansion, all wireless channels are transmitted by the duplexer on the transmitting side and the receiving side. Since the loss deviation does not increase and is equalized, there is no effect on telephone calls, data, etc. being transmitted by the microwave multiplexing radio equipment, and the expansion of wireless channels without momentary interruption is possible at both the transmitting and receiving sides. This has the effect of equalizing the deviation of transmission loss between radio channels and obtaining uniform transmission quality.

[Brief explanation of the drawing]

FIG. 1 is a principle diagram showing the configuration of the wireless channel expansion method without instantaneous interruption according to the present invention. FIG. 2 is a block diagram showing the configuration of the wireless channel expansion method without instantaneous interruption according to the embodiment of the present invention. FIG. 3 is a block diagram of a conventional wireless channel expansion method without momentary interruption. In the figure, 11' to 1n are band pass filters, 21 to 2n are circulators for each channel, 31.32 are common channel circulators, 41.42 are low pass filters, 100
1 is a transmitting side duplexer, and 100N is a receiving side duplexer. I am sending this to you.The present invention is not based on Japanese characteristics, and the line + = 9 was set up by Shinya.

Claims (1)

[Claims] Channel-specific filters (11-
1n), a channel-specific circulator (21 to 2n) connected to the antenna side of the channel-specific filter, and a channel common circulator (31, 32) provided on the antenna side of the circulator and having a terminating resistor (R). In the duplexer (100_T, 100_K), when installing the wireless channel demultiplexer, the channel to be used (CH
1~CHm) channel-specific circulator (21~2m)
) are connected in a line so that the order from the channel common circulator is reversed on the transmitting and receiving sides, and the used channel (CH
A low-pass filter (41, 42) is provided to pass the signals for the remaining channels (CH_m_+_1 to CHn), but to block the signals for the remaining expansion channels (CH_m_+_1 to CHn). Terminating resistance (of the common circulator (31, 32)
R) is temporarily removed, and instead, circulators (2_m_+_1 to 2n) having channel-specific filters (1_m_+_1 to 1n) of the branching filter for the additional channels are connected in the reverse order on the transmitting side and the receiving side, and then terminated. A method of adding wireless channels without interruption.