JPH02119332A - Time divisional multi-way multiplex communication system with automatic bit position alignment function - Google Patents

Abstract

PURPOSE:To automatically perform bit position alignment by setting a communication path by a carrier for maintenance between a master station and a slave station, transmitting bit dislocation information from the master station, and performing the bit position alignment by the adjustment of a delay quantity at the slave station when the slave station is installed newly or the facility of the slave station is added. CONSTITUTION:The maintenance carrier of the master station 1 is supplied to a radio transmission/reception circuit 108, and a radio transmission/reception path is set in parallel with a radio transmission/reception path for communication, and the slave station 2 supplies the maintenance carrier 28 to the radio transmission/reception circuit 208 by switching a switching circuit 207. The master station 1 detects a reference signal 14 from a signal sent from the slave station 2, and detects bit dislocation by comparing the reference signal with a frame signal 11 which becomes the reference of a system at a comparator 104, and performs the time divisional multiplex of the bit dislocation information 16 on a transmission signal 15 to the slave station 2. The slave station 2 detects the bit dislocation information 23 by a detection circuit 202, and sets the delay quantity of a delay circuit 203. An operation to set the delay quantity is repeated, and the switching circuit 207 is switched at a time when no bit dislocation exists.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a time division multiplex communication system.

[Conventional technology]

Conventionally, time division multidirectional multiplex communication systems are as shown in Figs.
As shown in the figure, a frame signal 11 serving as a reference for the system is multiplexed on a signal 10 sent from the master station 6 to each slave station 7.8, and each slave station 7.8 receives this frame signal 11.
It synchronizes with reference to , and sends out burst signals 30 and 40 to the master station 6 in accordance with the channel assigned to its own station. The delay time for this synchronization is set when new slave stations are installed or expanded. Now, if a new slave station 9 is to be installed, the distance between the master station 6 and the slave station 9 must be accurately determined using a map, etc., and the propagation delay of the radio waves must be calculated to avoid affecting the communication of other stations. After calculating the amount and setting the delay ■ of the delay circuit 403 of the slave station 9 shown in FIG.
, 8 and the master station 6, fine adjustments were made manually without affecting communication between them. For this fine adjustment, the slave station 9 first receives the frame signal generation circuit 10 from the master station 6.
Multiplexing circuit 102, wireless transmitting/receiving circuit 308.408. The frame synchronization circuit 201 performs frame synchronization using the frame signal inputted through the delay circuit 203, and the resulting reference signal of the local station is sent to the communication signal 25 via the multiplexing circuit 204.
The signals are time-division multiplexed and transmitted from the wireless transmission/reception circuit 408 using the communication wireless carrier wave 27 supplied from the carrier generation circuit 205. In the master station 6, the reference signal 14 is detected by the detection circuit 103 via the radio transmitting/receiving circuit 308, and the comparison circuit 1
04, the bit position shift information 16 is outputted by comparison with the frame signal 11, and the multiplexing circuit 105 time-division multiplexes the signal 17 onto the communication signal 15, and the signal 17 is sent from the radio transmitting/receiving circuit 308.
Transmission is performed using a radio carrier wave 18 supplied from a carrier wave generation circuit 106. The slave station 9, which receives this information at the wireless transmitting/receiving circuit 408, passes through the delay circuit 203, detects the bit position shift information at the detection circuit 202, and outputs it to the display device.

The adjuster reads this display and manually adjusts the delay circuit 203.
Fine-tune the amount of delay. Subsequent frame synchronization circuit 20
The reference signal of 1 is again outputted via the multiplexing circuit 204, and the same operation is repeated until the bit position shift information disappears.

[Problems to be Solved by the Invention] In the above-mentioned conventional time-division multidirectional multiplex communication system, bit alignment is performed by manually adjusting the delay circuit, which is complicated, and bit alignment is difficult. If this is not done correctly, there is a drawback that the burst signal sent by the slave station may overlap the burst signal sent by another slave station for normal communication.

[Means for Solving the Problems] In the time-division multidirectional multiplex communication system with automatic bit alignment function of the present invention, a master station includes a maintenance carrier generation circuit that generates a maintenance carrier wave and a communication base band signal. The slave station has a wireless transmitting and receiving circuit that performs wireless transmission and reception using maintenance carrier waves, and the slave station receives signals from the master station through a delay circuit that is set with a delay amount that adjusts the radio wave propagation delay time depending on the distance between the slave station and the master station. An adjustment circuit that adjusts and aligns bits based on bit position shift information, a maintenance carrier generation circuit that generates the same maintenance carrier wave as the master station, and wireless transmission and reception of communication baseband signals using the maintenance carrier wave. The apparatus includes a wireless transmitting/receiving circuit that performs communication, and a means for mutually switching between communication using a communication carrier wave and communication using a maintenance carrier wave.

[Function 1: When installing a new slave station or expanding equipment, first set up a communication path using a carrier wave for maintenance between the master station and the slave station, and transmit bit position shift information from the master station via the communication path.
In the slave station, the adjustment circuit performs bit position alignment by adjusting the delay amount of the delay circuit based on the bit position shift information detected by the detection circuit, so that the adjustment circuit automatically performs bit position alignment without affecting other communications and without any human intervention. Bit alignment can be performed automatically.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a multidirectional multiplex communication system with an automatic bit alignment function according to the present invention.

This time-division multidirectional multiplex communication system with automatic bit alignment function uses a conventional frame signal generation circuit 1 in the master station 1.
01, in addition to the multiplexing circuits 102 and 105, the detection circuit 103, the comparison circuit 104, and the carrier wave generation circuit 106, the maintenance carrier generation circuit 107 performs wireless transmission and reception using the maintenance carrier wave in parallel with the wireless transmission and reception using the normal communication carrier wave. Wireless transmitter/receiver circuit 10 that can perform
8, and the slave station 2 includes a conventional delay circuit 203, a frame synchronization circuit 201, a multiplexing circuit 204, a detection circuit 202,
In addition to the carrier wave generation circuit 205, a maintenance carrier wave generation circuit 206, a switching circuit 207, and a wireless transmission/reception circuit 208 are provided.
, and has an adjustment circuit 210. The switching circuit 207 switches either the carrier generation circuit 205 or 206 to the wireless transmission/reception circuit 20.
Switch to connect to 8. The wireless transmission/reception circuit 208 has a function of performing wireless transmission/reception using a maintenance carrier wave in addition to conventional wireless transmission/reception using a carrier wave. Adjustment circuit 210
sets the delay amount of the delay circuit 203 based on the bit position shift information detected by the detection circuit 202.

Next, the operation of this embodiment will be explained.

First, an operator supplies a maintenance carrier wave of the master station I to the wireless transmission/reception circuit 108, and sets a wireless transmission/reception path using the maintenance carrier wave in parallel with a communication wireless transmission/reception path,
In the slave station 2, the switching circuit 207 is switched to supply the maintenance carrier wave 28 to the wireless transmission/reception circuit 208. By setting this state, the slave station 2 receives the output signal from the maintenance carrier wave 19 of the master station 1 with the wireless transmitting/receiving circuit 208, and the frame synchronization circuit 201 synchronizes with the frame signal therein and uses the resulting reference signal. Output 22,
A multiplexing circuit 204 time-division multiplexes the transmitted signal 25 to the master station I. On the other hand, the master station 1 detects the reference signal 14 from the signal sent from the slave station 2 by the detection circuit 103, and compares it with the frame signal 11, which is the reference of the system, by the comparison circuit 104 to detect a bit position shift. The positional deviation information 16 is time-division multiplexed into the transmission signal 15 to the slave station 2 by the multiplexing circuit 105. In the slave station 2, the detection circuit 202 detects bit position shift information 23 from the signal sent from the master station 1, and the adjustment circuit 210 sets the delay amount of the delay circuit 203 based on this bit position shift information 23. and,
By repeating this delay 1 setting, when only one bit position is left in the reference signal sent by the slave station 2, the switching circuit 207 switches to the carrier wave 27 for normal communication, and the master station 1 also stops transmission and reception using the maintenance carrier wave 19. By doing so, normal communication between the master station 1 and the slave station 2 is started.

[Effects of the Invention] As explained above, in the case of installing a new slave station or expanding equipment, the present invention first sets up a communication path using a carrier wave for maintenance between the master station and the slave station, and then connects the master station via the communication path. The adjustment circuit sets the delay amount of the delay circuit based on the bit position deviation information detected by the detection circuit in the slave station, and repeats this to align the bit position. This has the advantage that bit positioning can be automatically performed without affecting other communications and without requiring any human intervention.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a time division multidirectional multiplex communication system with automatic bit alignment function of the present invention, and Fig. 2 is a transmission/reception of the time division multidirectional multiplex communication system between one master station and three slave stations. Diagram showing the state, 3rd Er (a), (b
l, (cl, (d) are the master station 6 and slave station 7 in Fig. 2.
Figure 4 is a block diagram of a conventional example of a positioning circuit for a time division multidirectional multiplex communication system. Station, 2...Slave station, old......Frame signal generation circuit, 02.105.204...Multiplexing circuit , 03, 202...Detection circuit, 04...Comparison circuit, 06, 205... ...Carrier wave generation circuit, 07, 206...Carrier wave generation circuit for maintenance, 108, 208... Radio transmitting and receiving circuit, 201・・・・・・・・・・・・・・・Frame synchronization circuit, 203・・・・・・・・・・・・・・・
・・・Delay circuit, 207・・・・・・・・・・・・・・・
...Switching circuit, 210...
...adjustment circuit. Diagram

Claims (1)

[Claims] 1. Consisting of one master station and a plurality of slave stations that communicate with the master station by radio, the master station multiplexes frame signals that serve as system standards into transmission signals to the slave stations. In a time-division multidirectional multiplex communication system, each slave station performs frame synchronization using the frame signal as a reference, and transmits and receives signals to and from the master station on the assigned channel.The master station generates carrier waves for maintenance. It has a maintenance carrier generation circuit that performs maintenance carrier wave generation, and a wireless transmission/reception circuit that wirelessly transmits and receives communication baseband signals using maintenance carrier waves, and the slave station adjusts the radio wave propagation delay time depending on the distance between the slave station and the master station. An adjustment circuit that adjusts a delay circuit in which a delay amount is set based on bit position shift information received from a master station to align bits; a maintenance carrier generation circuit that generates the same maintenance carrier wave as the master station; a wireless transmitting/receiving circuit that wirelessly transmits and receives communication baseband signals using carrier waves;
A time division multidirectional multiplex communication system with an automatic bit alignment function, characterized by having means for mutually switching between communication using a communication carrier wave and communication using a maintenance carrier wave.