WO2015178315A1

WO2015178315A1 - Communication system

Info

Publication number: WO2015178315A1
Application number: PCT/JP2015/064075
Authority: WO
Inventors: 裕太竹本; 小西　良明; 和夫久保; 杉原　隆嗣
Original assignee: 三菱電機株式会社
Priority date: 2014-05-21
Filing date: 2015-05-15
Publication date: 2015-11-26
Also published as: JPWO2015178315A1; JP5933862B2

Abstract

The present invention addresses the problem of obtaining a communication system in which power consumption is suppressed in a relay device. Provided is a communication system comprising: a transmission device (1) that encodes transmission data using error correction code and transmits the encoded data; a relay device (2a) that performs further encoding using error correction code and forwards the data, without decoding the data from the transmission device (1); and a receiving device (4a) that receives the forwarded data and decodes the consecutively encoded data. In a case where there are a plurality of relay devices, even longer-distance transmission becomes possible.

Description

Communications system

The present invention relates to a communication system having a relay device.

Conventionally, when a device that transmits a signal according to a transmission standard such as OTN (Optical Transport Network) performs long-distance transmission, the signal / noise (S / N) ratio deteriorates as the transmission distance increases. Quality deteriorates and a desired error rate cannot be obtained. Therefore, it is necessary to perform regenerative relay by a relay device installed at an appropriate interval. Regenerative relay requires a function called 3R. Here, 3R is Reshaping, Retiming, and Regenerating. The relay apparatus performs error correction decoding of the received signal, corrects an error in the transmission section, performs error correction coding again, and transmits the signal, thereby realizing long-distance transmission of a low error rate signal.

For example, in Patent Document 1, a relay apparatus that performs regenerative relay performs error correction decoding of a received signal, corrects an error in a transmission section, performs error correction coding again, and transmits the signal, thereby reducing a low error rate. A technique for realizing long-distance transmission of a signal is disclosed.

JP 2008-258701 A

However, according to the conventional technology, the power consumption in the relay device is large. Therefore, there is a problem that it is difficult to install a relay device in a place where power to be supplied cannot be secured.

The present invention has been made in view of the above, and an object thereof is to obtain a communication system in which power consumption in a relay device is suppressed.

In order to solve the above-described problems and achieve the object, the present invention provides a transmission apparatus that encodes transmission data with an error correction code and transmits the encoded data, and the data from the transmission apparatus. A relay apparatus that performs encoding by error correction code and performs transfer without decoding, and a reception apparatus that receives the transferred data and decodes the data subjected to concatenated encoding It is characterized by that.

The communication system according to the present invention has an effect of reducing power consumption in the relay device.

FIG. 1 is a diagram illustrating an example of a configuration of a communication system according to the first embodiment. FIG. 2 is a diagram illustrating an example of a structure of a payload portion of data subjected to error correction coding in the configuration of the communication system according to the first embodiment. FIG. 3 is a diagram illustrating an example of a structure of a payload portion of data subjected to error correction coding in the configuration of the communication system according to the first embodiment. FIG. 4 is a diagram of an example of a configuration of the communication system according to the first embodiment. FIG. 5 is a diagram of an example of a configuration of the communication system according to the first embodiment. FIG. 6 is a diagram illustrating an example of a configuration of a communication system according to the second embodiment. FIG. 7 is a diagram of an example of a configuration of the communication system according to the third embodiment. FIG. 8 is a diagram illustrating another example of the configuration of the communication system according to the third embodiment. FIG. 9 is a diagram illustrating another example of the configuration of the communication system according to the third embodiment. FIG. 10 is a diagram illustrating another example of the configuration of the communication system according to the third embodiment. FIG. 11 is a diagram illustrating an example of a configuration of a communication system according to the fourth embodiment. FIG. 12 is a diagram illustrating an example of a hardware configuration that implements a transmission device, a relay device, and a reception device that configure the communication system according to the first to fourth embodiments.

Hereinafter, a communication system according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a diagram illustrating an example of a configuration of a communication system according to a first embodiment of the present invention. The communication system shown in FIG. 1 includes a transmission device 1, relay devices 2 and 3, and a reception device 4. The transmission apparatus 1 performs error correction coding on the data received as transmission data by the encoding unit 11 and transmits the data to the relay apparatus 2. The relay device 2 does not decode the encoded data received from the transmission device 1, further encodes the received data by the encoding unit 21 and transfers the encoded data to the relay device 3. The relay apparatus 3 does not decode the encoded data received from the relay apparatus 2, further encodes the transferred data by the encoding unit 31 and transfers the encoded data to the receiving apparatus 4. The receiving device 4 receives the data subjected to the concatenated encoding as described above, decodes each encoding by the decoding unit 41, restores the data, and sets it as reception data. The concatenated encoded data refers to data that has been encoded two or more times. Here, typically, the data encoded by the encoding unit 11 is further encoded by the encoding unit 21. The data encoded in step (b) is concatenated encoded data. The data encoded in the encoding unit 11 is further encoded in the encoding unit 21, and then further encoded in the encoding unit 31. The converted data is also concatenated encoded data.

Here, two methods can be exemplified as the error correction coding method performed by the transmission apparatus 1. FIGS. 2 and 3 illustrate these two methods. In FIGS. 2 and 3, the data structures in the sections 1, 2 and 3 are shown. In the present invention, any of the systems shown in FIGS. 2 and 3 may be used, as long as they are properly used.

FIG. 2 is a diagram showing an example of a structure of a payload portion of data subjected to error correction coding in the configuration of the first embodiment of the communication system according to the present invention. In FIG. 2, the parity part is accumulated in a free area existing in the payload part every time encoding is performed. In the structure shown in FIG. 2, the encoding rate and the encoding rate are the same between encodings, and the position of the FEC (Forward Error Correction) part can be made the same. However, a free area exists. In FIG. 2, the empty area is expressed as empty, and the parity part is expressed as FEC1, 2, and 3. Moreover, RS (Reed-Solomon) code or LDPC (Low-Density Parity-Check) code can be exemplified as a code used for encoding. FEC1 is an FEC unit or parity unit generated by the encoding unit 11 of the transmission apparatus 1, FEC2 is an FEC unit or parity unit generated by the encoding unit 21 of the relay apparatus 2, and FEC3 is a relay unit This is an FEC unit, that is, a parity unit generated by the encoding unit 31 of the device 3.

FIG. 3 is a diagram showing an example of a structure of a payload portion of data subjected to error correction coding in the configuration of the first embodiment of the communication system according to the present invention. In FIG. 3, the parity part is sequentially stacked every time encoding is performed. In the structure shown in FIG. 3, there is no empty area, the encoding rate and the encoding rate vary, and the positions of the FEC units are different.

Incidentally, the relay apparatuses 2 and 3 shown in FIG. 1 do not include a decoding unit and do not correct errors. Therefore, even if an error occurs, the relay devices 2 and 3 perform error correction coding on the data in which the error has occurred, and transfer the data to the next device. Error correction decoding is performed in the receiving device 4. As described above, even if error correction coding is performed on data in which an error has occurred, if the correction capability of the error correction code satisfies a requirement, finally, the receiving device 4 finally determines each section. Since error correction is performed, received data without error can be obtained.

Here, since the error correction decoding in the receiving device 4 is performed from the side close to the receiving device 4, that is, in the reverse order to the encoding, the error correction encoding performed by the transmission device 1 and the relay devices 2 and 3 is It suffices to have a correction capability that satisfies the required error rate up to the next device to which data arrives. If the required error rate can be satisfied up to the next device, the transmission device 1 to the receiving device 4 It is possible to guarantee the error rate of all sections.

When the relay devices 2 and 3 perform decoding one by one, the user of the reception device 4 can clarify the responsibility of the relay devices 2 and 3 when an error occurs in the reception data of the reception device 4. . Also in the present invention, since the error correction coding performed by the

encoding units

21 and 31 satisfies the error rate up to the next device, the receiving device 4 is similar to the case where the relay devices 2 and 3 perform decoding one by one. Even if an error occurs in the received data, the responsibility of the relay devices 2 and 3 can be clarified.

Also, the power required for encoding is lower than the power required for decoding. Therefore, the relay apparatuses 2 and 3 perform only the encoding as described above, and add parity for error correction to each of the relay apparatuses 2 and 3 to reduce power consumption while maintaining transmission quality. be able to.

Therefore, in the communication system according to the present invention, it becomes possible to install a relay device at a place where power to be supplied could not be secured, and the degree of freedom of the installation location of the relay device can be improved.

In FIG. 1, two relay devices are illustrated as devices that relay data. However, the present invention is not limited to this, and there may be one relay device that relays data. There may be three or more.

FIG. 4 is a diagram showing another example of the configuration of the first embodiment of the communication system according to the present invention. The communication system shown in FIG. 4 includes a transmission device 1, a relay device 2a, and a reception device 4a. The communication system shown in FIG. 4 is an example in which one relay device is used. The transmission device 1 performs error correction coding on the data received as transmission data by the encoding unit 11 and transmits the data to the relay device 2a. The relay device 2a does not decode the encoded data received from the transmission device 1, but further encodes the received data by the encoding unit 21a and transfers the data to the receiving device 4a. The receiving device 4a including the decoding unit 41a receives the data subjected to the concatenated encoding as described above, decodes each encoding, restores the data, and sets the data as received data. As shown in FIG. 4, there may be one relay device for relaying.

FIG. 5 is a diagram showing an example of the configuration of the first embodiment of the communication system according to the present invention. The communication system shown in FIG. 5 includes a transmission device 1,

relay devices

2b, 3a, and 5 and a reception device 4b. Although only one relay device 5 is provided in FIG. 5, a plurality of intermediate relay devices 5 may be provided. The transmission apparatus 1 performs error correction coding on the data received as transmission data by the encoding unit 11 and transmits the data to the relay apparatus 2b. The relay device 2 b does not decode the encoded data received from the transmission device 1, further encodes the received data by the encoding unit 21 b and transfers the data to the relay device 5. The relay device 5 does not decode the encoded data received from the relay device 2b, further encodes the received data by the encoding unit 51, and transfers the encoded data to the relay device 3a. The relay device 3a does not decode the encoded data received from the relay device 5, but further encodes the transferred data by the encoding unit 31a and transfers the encoded data to the reception device 4b. The receiving device 4b including the decoding unit 41b receives the data subjected to the concatenated encoding as described above, decodes each encoding, restores the data, and sets the data as received data. As shown in FIG. 5, there may be three relay devices that relay. Although FIG. 5 shows an embodiment in which there are three relay devices, when there are four or more relay devices, a plurality of relay devices 5 may be provided, and even if there are four or more relay devices. Good.

In the present embodiment, encoding is performed a plurality of times before data is received by the receiving device 4b. However, these encodings may be performed on a multiplexed signal. When multiple multiplexed signals are encoded, the signals with the same transmission destination are collectively compared to the case where low-rate signals are subjected to error correction processing and transmitted separately. Thus, it is possible to reduce processing by performing error correction coding. Note that a plurality of multiplexed signals are signals obtained by performing any one of space division multiplexing, frequency division multiplexing, time division multiplexing, and code division multiplexing a plurality of times.

Also, the encoding performed a plurality of times before the data is received by the receiving device 4b is a different encoding process, and the encoding immediately before being received by the receiving device 4b is an encoding that performs soft decision error correction. It is preferable that Since soft decision error correction shows higher error correction than hard decision error correction, it is preferable to use a soft decision error correction method within the available range. This is because digital processing is performed and soft decision information is lost. Here, the encoding immediately before being received by the receiving device 4b is the encoding performed by the encoding unit 31 of the relay device 3 in FIG. 1, and in the example shown in FIG. 4, the encoding unit of the relay device 2a. This is the encoding performed by 21a, and in the example shown in FIG. 5, is the encoding performed by the encoding unit 31a of the relay device 3a.

In the present embodiment, receiving device 4 includes only decoding unit 41, receiving device 4a includes only decoding unit 41a, receiving device 4b includes only decoding unit 41b, and a plurality of encoding units. Although one decoding unit performs decoding of the encoded data, the present invention is not limited to this, and the receiving apparatus may include a plurality of decoding units.

Embodiment 2. FIG.
FIG. 6 is a diagram showing an example of the configuration of the second embodiment of the communication system according to the present invention. The communication system shown in FIG. 6 is a PON (Passive Optical Network) system, which is a transmission device ONU (Optical Network Unit) 6, 7, 8, a repeater 9 as a relay device, and an OLT (Optical) as a reception device. Line Terminal) 10. Note that sections 1 and 2 shown in FIG. 6 correspond to sections 1 and 2 shown in FIG. Each of the

ONUs

6, 7, and 8 performs error correction coding on the data received as transmission data by the

encoders

61, 71, and 81 included therein, and transmits the data to the repeater 9. The repeater 9 does not decode the encoded data received from the

ONUs

6, 7, and 8, further encodes the received data by the encoding unit 91 and transfers the data to the OLT 10. The OLT 10 receives the data encoded as described above, decodes the data by the decoding unit 101, and restores the data to receive data.

In FIG. 6, one repeater is shown as an example of an apparatus that relays data. However, the present invention is not limited to this, and a plurality of repeaters are provided as in the relay apparatus of the first embodiment. It may be.

In the PON system, a repeater is used as a relay device for extending the transmission distance of the system. However, the repeater may be installed outdoors, and it may be difficult to supply power necessary for the operation of the repeater depending on the installation environment. Therefore, as described in the present embodiment, the repeater can be reduced in power consumption by performing only error correction coding without decoding in the repeater, and the degree of freedom of installation of the repeater can be reduced. Can be improved.

Embodiment 3 FIG.
In the communication system according to the present invention, interleaving and deinterleaving may be performed. FIG. 7 is a diagram showing an example of the configuration of the third embodiment of the communication system according to the present invention. The communication system shown in FIG. 7 is a form in which an interleaver and a deinterleaver are installed in the communication system shown in FIG. 4 of the first embodiment. The communication system shown in FIG. 7 includes a transmission apparatus 1A that encodes transmission data using an error correction code and transmits the encoded data, and further performs error correction code without decoding the data from the transmission apparatus 1A. A relay apparatus 2A that performs encoding and transfer according to the above, and a reception apparatus 4A that receives the transferred data and decodes the data subjected to the concatenated encoding.

The transmission apparatus 1A performs error correction encoding on the data received as transmission data by the encoding unit 11A, performs interleaving on the data subjected to error correction encoding by the interleaver 12A, and converts the data to the data subjected to interleaving. On the other hand, the deinterleaver 13A performs deinterleaving and transmits data to the relay apparatus 2A. The relay apparatus 2A does not decode the encoded data received from the transmission apparatus 1A, further encodes the received data by the encoding unit 21A, and performs the encoding on the encoded data. Interleaving is performed by the interleaver 22A to transfer data to the receiving device 4A. The receiving device 4A performs deinterleaving on the data transferred from the relay device 2A by the deinterleaver 43A, decodes the deinterleaved data by the

decoding units

41A and 42A, and restores the data. Received data. The decoding unit 41A decodes the encoding by the encoding unit 21A, and the decoding unit 42A decodes the encoding by the encoding unit 11A. Note that interleaving is a process of disposing data in a discontinuous manner, which is performed in a transmission-side apparatus during data transmission mainly for the purpose of improving resistance to burst errors. Deinterleaving is a process for releasing the interleaving in the receiving apparatus.

As in the communication system shown in FIG. 7, by performing interleaving between the transmission apparatus 1A and the relay apparatus 2A or between the relay apparatus 2A and the reception apparatus 4A, the FEC configuration is independent on each transmission path. Can be interleaved.

FIG. 8 is a diagram showing another example of the configuration of the communication system according to the third embodiment of the present invention. The communication system shown in FIG. 8 includes a transmission apparatus 1B that encodes transmission data using an error correction code and transmits the encoded data, and further performs error correction code without decoding the data from the transmission apparatus 1B. A relay apparatus 2B that performs encoding and transfer according to the above, and a reception apparatus 4B that receives the transferred data and decodes the data subjected to the concatenated encoding.

The transmission device 1B performs error correction coding on the data received as transmission data by the encoding unit 11B, performs interleaving on the data subjected to error correction coding by the interleaver 12B, and sends the data to the relay device 2B. Send. The relay apparatus 2B does not decode the encoded data received from the transmission apparatus 1B, further encodes the received data by the encoding unit 21B, and performs the encoding on the encoded data. The interleaver 22B further performs interleaving to transfer data to the receiving device 4B. The receiving device 4B performs deinterleaving on the data transferred from the relay device 2B by the deinterleaver 43B, decodes the deinterleaved data by the decoding unit 41B, and converts the data to the decoded data. On the other hand, deinterleaving is further performed by the deinterleaver 44B, and the data that has been deinterleaved twice is further decoded by the decoding unit 42B to restore the data to receive data.

In the communication system shown in FIG. 8, the interleaving executed by the transmission apparatus 1B is not deinterleaved by the relay apparatus 2B, and the data further interleaved by the relay apparatus 2B is received by the receiving apparatus 4B. With the configuration shown in FIG. 8, it is not necessary to secure a memory for performing deinterleaving in the relay device 2B, and power consumption can be suppressed.

FIG. 9 is a diagram showing another example of the configuration of the communication system according to the third embodiment of the present invention. The communication system shown in FIG. 9 includes a transmission apparatus 1C that encodes transmission data using an error correction code and transmits the encoded data, and further performs error correction code without decoding the data from the transmission apparatus 1C. A relay device 2C that performs encoding and transfer according to the above, and a reception device 4C that receives the transferred data and decodes the data subjected to concatenated encoding.

The transmission apparatus 1C performs error correction coding on the data received as transmission data by the encoding unit 11C, performs interleaving on the data subjected to error correction coding by the interleaver 12C, and sends the data to the relay apparatus 2C. Send. The relay apparatus 2C does not decode the encoded data received from the transmission apparatus 1C, further encodes the received data by the encoding unit 21C, and transfers the data to the reception apparatus 4C. The receiving device 4C decodes the data transferred from the relay device 2C by the decoding unit 41C, performs deinterleaving on the decoded data by the deinterleaver 43C, and executes deinterleaving. The data is further decoded by the decoding unit 42C to restore the data to receive data.

In the communication system shown in FIG. 9, the interleaving executed by the transmission device 1C is not deinterleaved by the relay device 2C, and the data to which the FEC is added is transmitted to the receiving device 4C by the relay device 2C. With the configuration shown in FIG. 9, it is not necessary to secure a memory for performing interleaving and deinterleaving in the relay device 2C, and power consumption can be suppressed.

FIG. 10 is a diagram showing another example of the configuration of the communication system according to the third embodiment of the present invention. The communication system shown in FIG. 10 includes a transmission apparatus 1D that encodes transmission data using an error correction code and transmits the encoded data, and further performs error correction code without decoding the data from the transmission apparatus 1D. A relay apparatus 2D that performs encoding and transfer according to the above, and a reception apparatus 4D that receives the transferred data and decodes the data subjected to the concatenated encoding.

The transmission apparatus 1D performs error correction coding on the data received as transmission data by the encoding unit 11D and transmits the data to the relay apparatus 2D. The relay apparatus 2D does not decode the encoded data received from the transmission apparatus 1D, further encodes the received data by the encoding unit 21D, performs interleaving by the interleaver 22D, and receives the reception apparatus 4D. Send data to. The receiving device 4D performs deinterleaving on the data transferred from the relay device 2D by the deinterleaver 43D, and decrypts the data that has been deinterleaved by the

decoding units

41D and 42D to restore the data. To receive data.

In the communication system shown in FIG. 10, data subjected to interleaving by the relay device 2D is received by the receiving device 4D. With the configuration illustrated in FIG. 10, it is not necessary to secure a memory for performing deinterleaving in the relay device 2D, and power consumption can be suppressed.

Generally, a lot of memory is required to execute interleaving and deinterleaving. Therefore, when a relay device is installed in a place where errors are likely to occur in a memory represented by outer space, the reduction in the required memory amount due to the reduction in interleaver and deinterleaver not only reduces power consumption but also reduces cost. Contributes to reduction, improved reliability and longer life.

The communication system shown in FIGS. 8, 9, and 10 has resistance to a burst error, which is the purpose of interleaving, while reducing the functions required for the relay device, and performs deinterleaving by the receiving device. The reliability can be improved while suppressing the power consumption.

In this embodiment, it is desirable that the interleaving is performed except for the frame synchronization pattern. It is desirable that the interleaving is performed except for the frame synchronization pattern, so that the data relay of the data frame can be performed regardless of the presence or absence of the interleaver in the relay device at the subsequent stage.

In the communication systems shown in FIGS. 7, 8, 9, and 10, the same merit can be obtained even when a plurality of relay devices are used or when the relay device does not have an encoding unit. It is not limited to the illustrated example.

When there are a plurality of relay devices, the transmission distance and characteristics differ depending on the selected transmission path. According to the present embodiment, the transmission apparatus and the relay apparatus need only add error correction necessary for transmitting the signal to each subsequent apparatus, and the transmission apparatus considers the error rate in the entire transmission path. There is no need to perform the error correction encoding up to the first relay device.

Also, the relay device used by the transmission device may be replaced by upgrading the transmission device and the relay device or installing a new relay device. When such a relay device is exchanged, it is possible to flexibly cope with a change in the configuration of the communication system by enabling appropriate error correction coding between the devices.

Even if the manufacturer or manager of the transmission device in the communication system is different from the manufacturer or manager of the relay device, error correction up to the next device in the transmission path may be added. Even a communication system constituted by devices with different manufacturers or managers can be appropriately operated.

The communication system described above in the present embodiment is a form in which an interleaver and a deinterleaver are installed in the communication system shown in FIG. 4 of the first embodiment, and at least one of the transmission apparatus and the relay apparatus is an interleaver. The interleaver executes deinterleaving for the interleaver executed by the interleaver. The present invention is not limited to this, and an interleaver and a deinterleaver may be provided for the communication system shown in FIGS. That is, at least one of the transmission device, the transmission-side relay device, the intermediate relay device, and the reception-side relay device includes an interleaver, and the deinterleaving for the interleaving performed by the interleaver is performed in the communication system performed in the receiving device. It is included in the invention.

Embodiment 4 FIG.
FIG. 11: is a figure which shows an example of a structure of Embodiment 4 of the communication system concerning this invention. The communication system shown in FIG. 11 is a data relay satellite system in which a low-orbit satellite 110 typified by a weather satellite communicates with a ground station 140, and extends the communicable time between the low-orbit satellite 110 and the ground station 140. In addition, data relay

satellites

120 and 130 which are geostationary satellites are used. In the communication system shown in FIG. 11, the low orbit satellite 110 corresponds to a transmission device, the data relay

satellites

120 and 130 which are geostationary satellites correspond to relay devices, and the ground station 140 corresponds to a reception device.

The low orbit satellite 110 includes an encoding unit, which performs error correction encoding on transmission data and transmits the transmission data to the data relay satellite 120. The data relay satellite 120 includes an encoding unit, does not decode the encoded data received from the low-orbit satellite 110, and further encodes the received data by the encoding unit to perform the data relay satellite 130. Forward to. The data relay satellite 130 includes an encoding unit, does not decode the encoded data received from the data relay satellite 120, and further encodes the received data by the encoding unit to the ground station 140. Forward. The ground station 140 includes a decoding unit, receives the data encoded as described above, and performs decoding in the same manner as the receiving device 4 of FIG. 1 by the decoding unit to restore the data.

In FIG. 11, two data relay satellites are shown. However, the present invention is not limited to this, and there may be one data relay satellite or three or more data relay satellites.

The data relay satellite system, which is the communication system shown in this embodiment, is a long-distance communication, and an error correction process is desired to reduce the error rate. However, it is desirable to suppress such power consumption in an artificial satellite that consumes power in error correction processing and is difficult to supply or generate a large amount of power. Therefore, as described in the present embodiment, the data relay

apparatuses

120 and 130 can reduce the power consumption of the data relay

apparatuses

120 and 130 by performing only error correction coding without decoding. it can.

Note that the encoder, which is an encoder, the decoder, which is a decoder, an interleaver, and a deinterleaver, can all be realized by dedicated electronic circuits. Alternatively, the encoding unit, the decoding unit, the interleaver, and the deinterleaver may be realized by the processor 201 executing a program stored in the memory 202. In this case, the encoding unit, the decoding unit, the interleaver, and the deinterleaver are configured as shown in FIG. 12. The hardware configuration for realizing the encoding unit, the decoding unit, the interleaver, and the deinterleaver of the communication system according to the first to fourth embodiments. It is a figure which shows an example. Each of these devices transmits and receives signals to and from other devices using the transmitter 203 and the receiver 204. The processor 201, the memory 202, the transmitter 203 and the receiver 204 are connected by a system bus 205. Each of these devices may include a plurality of processors 201 and a plurality of memories 202.

The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

As described above, the communication system according to the present invention is useful for long-distance transmission, and is particularly suitable for a PON system or a data relay satellite system.

1, 1A, 1B, 1C, 1D transmission device, 2, 2A, 2B, 2C, 2D, 2a, 2b, 3, 3a, 5 relay device, 4, 4A, 4B, 4C, 4D, 4a, 4b receiving device, 6, 7, 8 ONU, 9 repeater, 10 OLT, 11, 11A, 11B, 11C, 11D, 21, 21A, 21B, 21C, 21D, 21a, 21b, 31, 31a, 51, 61, 71, 81, 91 Encoder, 12A, 12B, 12C, 22A, 22B, 22D Interleaver, 13A, 43A, 43B, 43C, 43D, 44B Deinterleaver, 41, 41a, 41b, 41A, 41B, 41C, 41D, 42A, 42B, 42C , 42D, 101 decoding unit, 110 low orbit satellite, 120, 130 data relay satellite, 140 ground station, 201 processor, 02 memory, 203 a transmitter, 204 a receiver, 205 a system bus.

Claims

A transmission device for transmitting data encoded by performing error correction encoding on transmission data; and
A relay device that performs encoding and transfer using an error correction code without decoding the data from the transmission device; and
A receiving apparatus that receives the transferred data and decodes the data subjected to the concatenated encoding.
A transmission device for transmitting data encoded by performing error correction encoding on transmission data; and
A transmission-side relay device that receives the data from the transmission device and performs encoding by an error correction code without performing decoding, and transferring the data;
A receiving-side relay device that receives the data that has undergone transfer by the transmission-side relay device and performs encoding using an error correction code without performing decoding, and transfers the data;
A receiving apparatus that receives the transferred data and decodes the data subjected to the concatenated encoding.
A transmission device for transmitting data encoded by performing error correction encoding on transmission data; and
A transmission-side relay device that receives the data from the transmission device and performs encoding by an error correction code without performing decoding, and transferring the data;
One or a plurality of intermediate relay devices that receive the data that has been transferred by the transmission-side relay device and perform encoding and transfer using an error correction code without performing decoding; and
A receiving-side relay device that receives the data that has undergone the transfer by the intermediate relay device and performs encoding by an error correction code without performing decoding, and transfers the data;
A receiving apparatus that receives the transferred data and decodes the data subjected to the concatenated encoding.
The communication system according to any one of claims 1 to 3, wherein the encoding is performed on a plurality of multiplexed signals.
Each of the encodings is a different encoding process;
The communication system according to claim 1, wherein the encoding in the relay device is encoding that performs soft decision error correction.
Each of the encodings is a different encoding process;
The communication system according to claim 2 or 3, wherein the encoding at the receiving side relay device is encoding for performing soft decision error correction.
At least one of the transmission device and the relay device includes an interleaver,
The communication system according to claim 1, wherein deinterleaving for interleaving performed by the interleaver is performed in the receiving device.
At least one of the transmission device, the transmission-side relay device, the intermediate relay device, and the reception-side relay device includes an interleaver,
4. The communication system according to claim 2, wherein execution of deinterleaving for interleaving performed by the interleaver is performed in the receiving apparatus.