JPH027631A - Time division multiple access satellite communication system - Google Patents

Abstract

PURPOSE:To attain the effective utilization of the line by providing a transmission data selection section receiving selectively an ordering line data and a monitor data or the like and outputting the result as a transmission data to the transmission system and outputting the monitor data or the like from a demultiplex section when the data is not the ordering line data regardless of the ordering line burst reception mode. CONSTITUTION:A transmission data selection section 2 receives selectively a monitor data and an ordering line (OW line) data being a bust signal outputted from a composition buffer section 1 and coming continuously, and outputs the result to a multiplex section 3 as a transmission data. A unique word detection section 6 receives a preamble in the OW line burst demultiplexed by a demultiplex section 4, detects whether the received transmission data is the OW line data or the monitor data based on the unique word in the preamble, and when the data is the monitor data, a monitor data detection signal is outputted. When the OW line burst is not used for the transmission/ reception of the OW line data, the monitor data or the like is inserted instead and it is utilized effectively for the purpose of monitoring of the equipment or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a time division multiple access (hereinafter referred to as TDMA) type satellite communication system.

[Conventional technology]

The TDMA satellite communication method is a satellite communication method in which multiple earth stations use all or part of the frequency band of a satellite communication repeater (transponder) in a time-sharing manner.
Although it is necessary to transmit data in the form of an intermittent signal, that is, a burst, at a specific period, that is, a TDMA frame period, it is not only possible to handle a variety of digital signals in an integrated manner; It is known as an efficient communication method because it allows the construction of highly flexible networks.

Conventionally, in a satellite communication system using this method, data for transmission from a meeting line (hereinafter referred to as an OW line) that comes in continuously is input to a compression buffer section 1 in a transmission system, as shown in t% Figure 3. The data is converted into burst signal data, which is then read into the multiplexer 13 at high speed, and a preamble containing a unique word indicating that it is OW line data is added and transmitted as an OWW line burst. On the other hand, in the receiving system, as shown in FIG. 4, the received OWW line burst is separated into OWW line data and a preamble in the separation unit 14,
The W line data is input to the decompression buffer section 5 and read out at low speed. At the same time, the unique word detector 16 detects the unique word in the preamble of the received OW line burst, determines whether the data of the received OWW line burst is OWW line data, and determines whether the data of the received OWW line burst is OWW line data. It is oWW line data! ! An OW line detection signal is output. When the OWW line detection signal is output, the data is sent first, and when the OWW line detection signal is not output, the data is ignored.

[Issues that Hatsuko tries to solve]

In the conventional TDMA satellite communication system described above, the OW line is only used for operation or maintenance meetings, and is rarely used after normal operation. The drawback is that it is not always used effectively.

[Means to solve the problem]

The TDMA satellite communication system of the present invention includes, in a transmission system, a compression buffer unit that inputs meeting line data, converts it into a burst signal, and outputs it; a code for the meeting line data of the burst signal output from the compression buffer unit; a transmission data selection unit that selectively inputs error rate measurement data and other monitoring data using a data switching signal and outputs the data as transmission data; and a transmission data selection unit that inputs the transmission data from the transmission data selection unit and converts the transmission data into meeting line data. a multiplexing section that adds a preamble including a unique word indicating that the data is meeting line data and transmits the transmission data as a meeting line burst when the data is meeting line data; A separation section that separates transmission data and a preamble; and an expansion buffer section that inputs meeting line data from the separation section and outputs it at low speed.

The separation unit inputs the preamble, detects whether or not it is a meeting line burst reception based on the unique word in the preamble, outputs a meeting line burst detection signal when it is a meeting line burst, and outputs a meeting line burst detection signal based on the unique word in the preamble. detects whether or not the received data is meeting line data, and if it is meeting line data, outputs a meeting line data detection signal, and confirms that it is meeting line burst reception and that the received data is not meeting line data. The unique word detection section has a unique word detection section that causes the separation section to directly output the monitoring data etc. when detected.

[Effect]

In the transmission system, meeting line data, code error rate, and other monitoring data are selectively input to the sending data selection section and input to the multiplexing section as sending data, and when the sending data is meeting line data, the meeting line data is selected. The transmission data is sent as a meeting line burst with a preamble including a unique word indicating that
In the reception system, a unique word detection unit inputs the preamble separated from the meeting line burst, detects whether or not it is a meeting line burst reception based on the unique word, and outputs a meeting line burst detection signal when it is a meeting line burst. It detects whether the sent or received data is meeting line data, and if it is meeting line data, it sends out a meeting line data detection signal, and the unique word detection unit detects meeting line burst reception and the received data. When it is detected that the data is not meeting line data, the separating unit directly outputs the monitoring data, etc., so when the system's meeting line burst is not used for sending and receiving meeting line data, it can be used for sending and receiving the monitoring data, etc. can.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a transmitting system of an embodiment of the TDMA satellite communication system of the present invention, and FIG. 2 is a block diagram of a receiving system of the embodiment of FIG. 1.

In the transmission system of this TDMA type satellite communication system, as shown in FIG. 1, a transmission data selection section 2 is added to the system shown in FIG. The configuration is such that you can input and send. The transmission data selection section 2 selectively inputs the OW line data of the burst signal outputted by the compression buffer section 1, the bit error rate measurement data, and other monitoring data using a data switching signal, and outputs the selected data to the multiplexing section 3 as transmission data. If the input transmission data is OW line data, the multiplexer 3 outputs a unique word indicating that it is OW line data, and if the input transmission data is the above-mentioned monitoring data, it outputs a unique word indicating that it is the monitoring data. and a preamble containing each of them is added and transmitted as an OW line burst.

On the other hand, as shown in FIG. 2, the reception system is equipped with a unique word detection section 6 which has increased functionality in addition to the 421 word detection section 1B shown in FIG. Depending on the unique word detection result of the unit 6, monitoring data is directly output. The unique word detection unit 6 inputs the preamble in the OW line burst separated by the separation unit 4, and detects whether or not it is an OW line burst reception based on the unique word in the preamble.

When detecting OW line burst reception, an OW line burst detection signal is output. Further, the unique word detection unit 6 detects whether the received transmission data is OW line data or monitoring data based on the unique word in the preamble, and if the data is OW line data, it is OW line data. When the detection signal is monitoring data, a monitoring data detection signal is output. When the received transmission data is OW line data, the OW line data is input from the separation unit 4 to the decompression buffer unit 5 and read out at low speed.
When the received transmission data is monitoring data, the monitoring data is directly output from the separation unit 4.

With the above configuration, when the OW line burst is not used for transmitting and receiving OW line data, it can be effectively used for purposes such as device monitoring by inserting monitoring data or the like instead.

〔Effect of the invention〕

As described above, the present invention includes a transmission data selection unit that manually selects and outputs meeting line data, code error rate measurement data, and other monitoring data in the transmission system of a TDMA satellite communication system as transmission data. When the transmission data is meeting line data, the multiplexing section adds a preamble including a unique word indicating that it is meeting line data and transmits it as a meeting line burst, and in the receiving system, the unique word detection section detects the unique word. detects whether or not it is a meeting line burst reception and whether the received data is meeting line data, and when it is a meeting line burst reception but the data is not meeting line data, that data, that is, monitoring data, etc. is separated. By configuring the system to directly output data, when the system's meeting line burst is not used for sending and receiving meeting line data, it can be effectively used for sending and receiving the monitoring data, etc., and the system can be monitored. This has the effect of improving reliability.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a transmitting system of an embodiment of the TDMA satellite communication system of the present invention, Fig. 2 is a block diagram of a receiving system of the embodiment of Fig. 1, and Fig. 3 is a block diagram of a TDMA satellite communication system of the embodiment. FIG. 4 is a block diagram of a conventional transmitting system, and FIG. 4 is a block diagram of a conventional receiving system shown in FIG. 1... Compression buffer section, 2... Transmission data selection section, 3... Multiplexing section. 4... Separation section, 5... Decompression buffer section, 6... Unique word detection section.

Claims (1)

[Scope of Claims] 1. A compression buffer section that inputs meeting line data into a transmission system, converts it into a burst signal, and outputs it; and the meeting line data of the burst signal outputted by the compression buffer section, and a code error rate. a transmission data selection section that selectively inputs measurement data and other monitoring data using a data switching signal and outputs the data as transmission data; and a transmission data selection section that inputs the transmission data from the transmission data selection section, and the transmission data is meeting line data. a multiplexing unit that adds a preamble including a unique word indicating that the data is meeting line data and transmits the transmission data as a meeting line burst, and a receiving system that receives the meeting line burst and transmits the transmission data. a decompression buffer section that inputs meeting line data from the separating section and outputs it at low speed; and an expansion buffer section that inputs the preamble from the separating section and receives the meeting line burst using a unique word in the preamble. If it is a meeting line burst, it outputs a meeting line burst detection signal. Also, it detects whether the received data is meeting line data using the unique word, and detects whether the received data is meeting line data. a unique word detection unit that outputs a meeting line data detection signal at some time, and when it detects that meeting line burst reception is occurring and the received data is not meeting line data, causes the separation unit to directly output the monitoring data, etc.; A time division multiple access satellite communication system having.