JP2006148829A - Data transmitting apparatus, and data receiving apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress interference between signals even if a plurality of communication services including an on-vehicle service and a portable service are simultaneously transmitted utilizing the same frequency band. <P>SOLUTION: A data processing apparatus 1 outputs each of a plurality of pieces of binary data of a data row 21 repeatedly twice at a double data sending speed of an ordinary speed and produces a data row 23 where continuous two piece of binary data are arrayed in the same order as in the data row 21. A data processing apparatus 3 outputs non-inverted data at the first time and outputs inverted data at the second time, for each of a plurality of pieces of binary data of a data row 25, at a double data sending speed of the ordinary speed and produces a data row 27 where two pieces of data continuing the non-inverted data and the inverted data for each piece of binary data are arrayed in the same order as in the data row 25. An addition and synthesis processing apparatus 5 adds the data row 23 and the data row 27 in the same or different addition ratios and produces a signal row 29. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides, for example, a data transmission device that transmits data to a plurality of reception terminals through a communication facility having a relay device such as a communication satellite, and a signal that is transmitted from the data transmission device through a communication satellite. The present invention relates to a data receiving apparatus that acquires

  Conventionally, implementation of broadcasting services and communication services using a quasi-zenith satellite system has been studied. This is because the broadcasting services and communication services that use the stationary satellites stopped above the equator are susceptible to obstacles such as buildings. Because the quasi-zenith satellites are moved almost to the zenith, broadcasting services and communication services that use the quasi-zenith satellite system are more effective than obstacles such as buildings as compared to broadcasting services and communication services that use geostationary satellites. It is thought that it is hard to be influenced. Details of the technical contents related to the quasi-zenith satellite system are described in, for example, an article “What is the quasi-zenith satellite system?” On pages 800 to 801 of the July 2003 issue of the Institute of Image Information Media.

  In the above technical documents, technologies related to providing various types of information to in-vehicle terminals mounted on automobiles, trains, etc. are listed, but it is necessary to consider services for providing information to mobile terminals owned by people. is there. Hereinafter, a service to a terminal mounted on an automobile or the like is referred to as an in-vehicle service, and a service to a mobile terminal possessed by a person is referred to as a mobile service.

  The communication satellite is located in a space far away from the ground about 40,000 kilometers, and the radio wave transmitted from the communication satellite is weak. For general reception, an antenna such as a parabolic antenna is used. The above weak radio waves are collected and received. However, in a portable terminal, antennas that can be used are restricted due to their size, usage, and the like, and only a small antenna such as a whip antenna can be used. Therefore, the antenna gain has to be reduced.

  Therefore, it is possible to consider increasing the radio wave output from the communication satellite, but it is avoided because there is a limit on the radio field intensity on the earth (area on the earth and radio field intensity per frequency bandwidth). As a method for doing this, a code spreading technique (spread spectrum technique) may be used. Since the code spreading technique can provide a communication service to a plurality of terminals by using the technique, it is also referred to as a code division multiple access (CDMA) technique.

  If an in-vehicle service and a mobile service are to be performed using a communication satellite, a large antenna can be used for the in-vehicle terminal, so that the antenna gain can be increased. As described above, since it is difficult to use a large antenna, the antenna gain cannot be increased. For this reason, measures are taken such as whether code spreading technology is used or spreading technology having different spreading ratios (spreading gains) is used for the in-vehicle service and the mobile service when only the mobile service is performed.

  Generally, in order to vary the spreading ratio, a technique of varying the spreading code length is adopted. However, in the special table 2002-534837 “Channel Spreading Apparatus and Method for Mobile Communication System”, the base station apparatus has different spreading codes. A terminal having a ratio and a CDMA communication system capable of spreading and despreading a channel signal using a spreading code having the same length have been proposed.

In this way, even if the spreading ratios are different or the spreading ratios are the same, orthogonal codes (orthogonal codes) composed of different code strings are used in code division multiple access. In CDMA communication using orthogonal codes, interference from other signals was only improved by the spreading ratio.
Special table 2002-534837 gazette The Journal of the Institute of Image Information and Television Engineers July 2003

  Therefore, an object of the present invention is to simultaneously transmit a plurality of communication services including a communication service to an in-vehicle terminal and a communication service to a mobile terminal using the same frequency band in a data transmission / reception system. It is to be able to suppress interference between signals.

  The data transmitting apparatus according to the first aspect of the present invention includes a first data processing unit that repeatedly outputs the input data of the first data series twice within the time required for transmission of the data, and the input first data processing unit. A process of outputting the data of the second data series as it is within the time required for transmission of the data and a process of generating and outputting the inverted data of the data of the second data series are executed. Data processing unit, the first data series data output from the first data processing unit, and the second data series data output from the second data processing unit, A modulated wave is generated by a data string synthesizing unit that synthesizes at a data output timing and at a predetermined synthesis ratio, and a data string synthesized by the data string synthesizing unit, and the modulated wave is transmitted to the outside. Comprising a data transmission unit that, the.

  In a preferred embodiment according to the first aspect of the present invention, at least one of the data series of the first and second data series is code division multiplexed data.

  In an embodiment different from the above, one of the data series of the first and second data series is time-division multiplexed data.

  In an embodiment different from the above, the data string synthesis by the data string synthesizing unit is performed by adding the data of the first data series and the data of the second data series.

  In another embodiment different from the above, the time required for outputting the first and second data series data from the first and second data processing units is the first and second data. It is set to a time required to transmit data that is an integral multiple of one data interval of each data constituting the column.

  Further, in an embodiment different from the above, the data of the first and second data series are respectively input to the first and second data processing units after a predetermined error correction code is added thereto. .

  The data receiving apparatus according to the second aspect of the present invention receives a modulated wave by a data string generated by combining the data of two transmitted data series, and the data string generated by the above combining from the modulated wave The data reception demodulator for demodulating the data and the data sequence generated by the synthesis output from the data reception demodulator, and after a predetermined time has elapsed, the data that is generated by the synthesis is output A sequence delay output unit; a data sequence generated by the synthesis output after a predetermined time has elapsed from the data sequence delay output unit; and a data sequence generated by the synthesis directly output from the data reception demodulation unit; And a data processing unit for performing data processing necessary to extract one of the data strings from the data string generated by the synthesis, and the data Comprising a data reproduction unit for reproducing and outputting a data of the data sequence output from the processing unit.

  In a preferred embodiment according to the second aspect of the present invention, the data processing required by the data processing unit to extract one of the data strings has elapsed for a certain period of time from the data string delay output unit. This is a process of adding the data sequence generated by the synthesis output later and the data sequence generated by the synthesis output directly from the data reception demodulator.

  In an embodiment different from the above, a data sequence that is output after a predetermined time elapses from the data sequence delay output unit by the data processing required by the data processing unit to extract any one of the data sequences. From this, the data string generated by the synthesis output directly from the data reception demodulation unit is subtracted.

  In another embodiment, the time from when the data string delay output unit inputs the data string generated by the synthesis until the data string is output constitutes the data string. The time required to transmit data that is an integral multiple of one data interval of each data to be transmitted is set.

  In another embodiment, the data of at least one of the two data series is code division multiplexed data.

  In another embodiment, the data of one data series of the two data series is time-division multiplexed data.

  In another embodiment, a predetermined error correction code is added to each of the data of the two data series.

  Furthermore, in an embodiment different from the above, an error correction code decoding unit for correcting an error in a data string to which the error correction code is added based on the predetermined error correction code is further provided, and the error correction code decoding is performed. When the data sequence to which the error correction code is added is output from the data processing unit, the unit corrects the error of the data sequence by the error correction code and then outputs the data sequence to the data reproduction unit .

  According to the present invention, in a data transmission / reception system, even if a plurality of communication services including a communication service for an in-vehicle terminal and a communication service for a mobile terminal are transmitted simultaneously using the same frequency band, Interference between signals can be suppressed.

  In each embodiment according to the present invention described below, a plurality of communication services such as an in-vehicle service and a mobile service can be transmitted simultaneously using the same frequency band. The data sequence is set to twice the normal transmission rate, and one of the two data sequences is transmitted with the same data and the other is inverted with the same frequency band and transmitted twice within the same time. This is achieved by adding a signal sent twice with the same data and reproducing one data series, or subtracting a signal sent twice with inverted data and reproducing the other data series. .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing an overall configuration of a data transmission facility provided in the data transmission / reception system according to the first embodiment of the present invention.

  As shown in FIG. 1, the data transmission facility includes a double identical data processing device 1, a double inverted data processing device 3, an addition / synthesis processing device 5, a modulation transmission device 7, and a satellite having a satellite communication function. (Communication satellite) 9. The double identical data processing device 1 includes a data input terminal 11, the double inverted data processing device 3 includes a data input terminal 13, and the modulation transmission device 7 includes an antenna 15. The modulation transmission device 7 includes a modulation unit 17 and a transmission unit 19.

  The twice identical data processing device 1 inputs a data string 21 through a data input terminal 11. Then, by repeating each of the plurality of binary data constituting the data string 21 at twice the normal data transmission speed and outputting twice, the two continuous binary data can be obtained. A data string 23 arranged in the same order as in the data string 21 is generated. The data string 23 is sent from the double identical data processing device 1 to the addition synthesis processing device 5.

  The double inverted data processing device 3 inputs the data string 25 through the data input terminal 13. For each of a plurality of binary data constituting the data string 25, non-inverted data is output at the first time, and data inverted at the second time is output at twice the normal data transmission speed, respectively. For each binary data, a data string 27 in which two data in which non-inverted data and inverted data are continuous is arranged in the same order as in the data string 25 is generated. The data string 27 is sent from the double inversion data processing device 3 to the addition synthesis processing device 5.

  The addition synthesis processing device 5 inputs the data string 23 sent from the twice identical data processing device 1 and the data string 27 sent from the double inversion data processing device 3, and the data string 23, the data string 27, Are added at the same or different addition ratios to generate a signal sequence 29. The signal sequence 29 is sent from the addition / synthesis processing device 5 to the modulation sending device 7.

  When the signal sequence 29 is transmitted from the addition / synthesis processing device 5 to the modulation transmission device 7, the modulation unit 17 inputs the signal sequence 29, modulates a carrier wave by the signal sequence 29, and modulates the modulated carrier wave. (Modulated wave) is sent to the transmitter 19. When the modulated wave is transmitted from the modulator 17, the transmitter 19 transmits the modulated wave to the communication satellite 9 through the antenna 15.

  The communication satellite 9 is equipped with a relay amplifier (not shown), receives a signal transmitted through the antenna 15, and receives the signal from a data receiving facility (shown in FIG. 3) described later by the relay amplifier (not shown). The signal processing for transmitting to is performed. This signal processing will be described with reference to FIG.

  In satellite communications, a PSK (Phase Shift Keying) system with little amplitude fluctuation after modulation such as BPSK (Binary Phase Shift Keying) or QPSK (Quadrature Phase Shift Keying) is generally used as a modulation method.

  FIG. 2 is a data sequence diagram illustrating an example of data employed in the data transmission facility included in the data transmission / reception system according to the first embodiment of the present invention.

  In the example illustrated in FIG. 2, four data columns are set as a first data column 31, a second data column 33, a third data column 35, and a fourth data column 37. In addition, one signal string 39 is set for the signal string.

  The first data string 31 corresponds to, for example, the data string 21 that is input from the data input terminal 11 to the double identical data processing device 1 shown in FIG. The first data string 31 is binary data “1” or “−1” <plural binary data> A, B, C, D, E are A, B, C , D, E.

  The second data string 33 corresponds to, for example, the data string 23 output from the twice identical data processing device 1 shown in FIG. 1, and the length of the second data string 33 is the first data string. It is the same as the length of 31. The second data string 33 is a double data transmission speed of the binary data A, B, C, D, and E constituting the first data string 31 in the twice identical data processing device 1, respectively. 2 repeatedly, each binary data A, B, C, D, E is converted into A, A, B, B, C, C, D, D, E, as shown in FIG. They are arranged in the order of E.

  The third data string 35 corresponds to, for example, the data string 25 input from the data input terminal 13 to the double inversion data processing device 3 shown in FIG. Similarly to the first data string 31, the third data string 35 is a binary data of “1” or “−1”, and O, P, Q, R, S are O, P, Q , R, S in this order.

  The fourth data string 37 corresponds to, for example, the data string 27 output from the double inversion data processing device 3 shown in FIG. The fourth data string 37 is non-inverted data of binary data O, P, Q, R, and S constituting the third data string 35 and their inverted data in the double inverted data processing device 3. -O, -P, -R, -S are in the order of O, -O, P, -P, Q, -Q, R, -R, S, -S, and twice the normal data. By outputting at the sending speed, as shown in FIG. 2, they are arranged in the order of O, -O, P, -P, Q, -Q, R, -R, S, -S.

  The signal sequence 39 corresponds to, for example, the signal sequence 29 output from the addition / synthesis processing device 5 shown in FIG. 1, and the length of the signal sequence 39 is the first to fourth data sequences (31, 33). , 35, 37). In the addition synthesis processing device 5, the signal sequence 39 includes a second data sequence 33 that is the data sequence 23 output from the double identical data processing device 1 and a data sequence 27 output from the double inverted data processing device 3. The fourth data string 37 is generated by adding the former with 4 and the latter with an addition ratio of 1 (addition ratio 4: 1). As shown in FIG. 2, the signal sequence 39 is binary data 4A + O, 4A−O, 4B + P, 4B−P, 4C + Q, 4C−Q, 4D + R, which is binary data subjected to addition synthesis processing in the addition synthesis processing device 5. 4D-R, 4E + S, and 4E-S.

  Note that the signal sequence 39 is 4A, 4A, which is four times the binary data A, A, B, B, C, C, D, D, E, E constituting the second data sequence 33. 4B, 4B, 4C, 4C, 4D, 4D, 4E, and 4E, and the binary data O, -O, P, -P, Q, -Q, R, -R, S and −S are analogly added in the addition / synthesis processing device 5. Therefore, the signal sequence 39 is replaced with 4A + O, 4A-O, 4B + P, 4B-P, 4C + Q, 4C-Q, 4D + R, 4D-R, 4E + S, and 4E-S, which are the added and combined values of the above binary data. 4 + 1, 4-1, -4 + 1, -4-1, that is, four values of 5, 3, -3, and -5.

  FIG. 3 is a block diagram showing an overall configuration of a data reception facility provided in the data transmission / reception system according to the first embodiment of the present invention.

  As shown in FIG. 3, the data reception facility includes the communication satellite 9 shown in FIG. 1, a reception demodulation device 41, and a data delay addition processing device 43. The reception demodulation device 41 includes an antenna 45 and includes a reception unit 47 and a demodulation unit 49. The data delay addition processing device 43 includes a data output terminal 57 and includes a data delay unit 51, an addition processing unit 53, and a data capture identification unit 55.

  As described in FIG. 1, the communication satellite 9 is equipped with a relay amplifier (not shown). The communication satellite 9 receives the signal transmitted from the modulation transmission device 7 shown in FIG. 1, and prevents interference between the received signal and the signal transmitted from the modulation transmission device 7. In the signal processing, the received signal is frequency-converted by the relay amplifier (not shown). And the signal after performing this frequency conversion is transmitted to the data reception equipment shown in FIG. 3 as a weak signal of predetermined intensity.

  In the reception demodulator 41, the antenna 45 collects and receives weak signals transmitted from the communication satellite 9 and sends them to the receiving unit 47. The receiving unit 47 has a tuning function so that a signal from the communication satellite 9 received by the antenna 45 can be input, and converts the received signal into an intermediate frequency corresponding to the frequency and easy to perform signal processing. And sent to the demodulator 49. The demodulator 49 receives the signal converted to the intermediate frequency from the receiver 47 and demodulates the signal, whereby the demodulated signal (the signal train 29 shown in FIG. 1, ie, FIG. 2) is demodulated from the signal. (Hereinafter referred to as “demodulated signal sequence”) 59 is taken out. The demodulated signal sequence 59 is output to the data delay unit 51 and the addition processing unit 53 of the data delay addition processing device 43, respectively.

  The data delay unit 51 receives the demodulated signal sequence 59 and generates a data delay signal sequence 61 that is a signal sequence delayed by one data period. The data delay signal sequence 61 is sent from the data delay unit 51 to the addition processing unit 53. The addition processing unit 53 inputs the demodulated signal sequence 59 sent from the demodulating unit 49 and the data delayed signal sequence 61 sent from the data delay unit 51, and adds the data delayed signal sequence 61 to the demodulated signal sequence 59. As a result, an addition signal sequence 63 is generated. Then, the addition signal sequence 63 is sent to the data capture identifying unit 55.

  The data capture identifying unit 55 performs a binarization process on the addition signal sequence 63 sent from the addition processing unit 53 to generate a data sequence 65 and outputs the data sequence 65 through the data output terminal 57. . Note that the above-described data string 65 corresponds to the data string 21 input to the double identical data processing device 1 from the data input terminal 11 shown in FIG. 1, that is, the first data string 31 shown in FIG. ing.

  FIG. 4 is a data sequence diagram illustrating an example of data employed in the data reception facility provided in the data transmission / reception system according to the first embodiment of the present invention.

  In the example shown in FIG. 4, three signal strings, that is, a first signal string 67, a second signal string 69, and a third signal string 71 are set. Further, one data column 73 is set for the data column.

  In FIG. 4, the first signal sequence 67 is, for example, the demodulated signal sequence 59 sent from the demodulation unit 49 shown in FIG. 3 to the data delay unit 51 and the addition processing unit 53, that is, shown in FIG. It corresponds to the signal sequence 39, and includes binary data 4A + O, 4A-O, 4B + P, 4B-P, 4C + Q, 4C-Q, 4D + R, 4D-R, 4E + S, 4E-S. From the first signal string 67, either the first data string 31 shown in FIG. 2 or the third data string 35 shown in FIG. 2 can be demodulated.

  The second signal sequence 69 corresponds to, for example, the data delay signal sequence 61 sent from the data delay unit 51 to the addition processing unit 53 shown in FIG. 4A + O, 4A-O, 4B + P, 4B-P, 4C + Q, 4C-Q, 4D + R, 4D-R, 4E + S, 4E-S are included.

  The third signal sequence 71 corresponds to, for example, the addition signal sequence 63 sent from the addition processing unit 53 to the data capture identifying unit 55 shown in FIG. That is, the addition processing unit 53 adds the second signal sequence 69 (the data delay signal sequence 61 shown in FIG. 3) to the first signal sequence 67 (the demodulated signal sequence 59 shown in FIG. 3). A third signal sequence 71 (addition signal sequence 63 shown in FIG. 3) is generated. In the third signal sequence 71, * indicates a location where the value at the timing of addition is unknown.

  The data string 73 corresponds to, for example, the data string 65 output from the data capture identifying unit 55 shown in FIG. This data sequence 65 is obtained by the data acquisition identifying unit 55 that alternately acquires the first data from the addition signal sequence 63 sent from the addition processing unit 53 and binarizes it. The data string 73 is the first data string 31 shown in FIG. 2, that is, the data string 21 that is input twice from the data input terminal 11 to the same data processing device 1 in the data transmission facility shown in FIG. 1. It corresponds to.

  FIG. 5 is a block diagram showing an overall configuration of a first modification of the data reception facility provided in the data transmission / reception system according to the first embodiment of the present invention.

  The data receiving facility according to this modification is provided with a data delay subtracting device 75 in place of the data delay adding processing device 43 shown in FIG. 3, and the data receiving device according to the first embodiment shown in FIG. Equipment and configuration are different. Since other configurations are the same as those of the data receiving facility shown in FIG. 3, the same components as those shown in FIG. 3 are denoted by the same reference numerals in FIG.

  Further, the data delay subtraction device 75 is different from the data delay addition processing device 43 shown in FIG. 3 in that a subtraction processing unit 77 is provided instead of the addition processing unit 53 shown in FIG. In the data delay subtracting device 75, the configuration other than the above is the same as that of the data delay adding processing device 43 shown in FIG. 3. Therefore, the data delay subtracting device 75 in the data delay adding processing device 43 shown in FIG. The same reference numerals are assigned to the same components and their detailed description is omitted.

In the data delay subtracting device 75, the subtraction processing unit 77 inputs the demodulated signal sequence 59 sent from the demodulating unit 49 of the reception demodulating device 41 and the data delayed signal sequence 61 sent from the data delay unit 51, and receives data By subtracting the demodulated signal sequence 59 from the delayed signal sequence 61, a subtracted signal sequence 79 is generated. Then, the subtraction signal string 79 is sent to the data capture identifying unit 55.
The above-described data string 81 corresponds to the data string 25 that is input from the data input terminal 13 shown in FIG. 1 to the double inversion data processing device 3, that is, the third data string 35 shown in FIG. .

  FIG. 6 is a data sequence diagram showing an example of data employed in the data reception facility provided in the data transmission / reception system shown in FIG.

  In the example shown in FIG. 6, three signal sequences are set, that is, a first signal sequence 83, a second signal sequence 85, and a third signal sequence 87. Also, one data column 89 is set for the data column.

  The first signal sequence 83 is the same as the first signal sequence 67 shown in FIG. That is, the first signal sequence 83 corresponds to the demodulated signal sequence 59 sent from the demodulation unit 49 shown in FIG. 5 to the data delay unit 51 and the subtraction processing unit 77, respectively, and the signal sequence 39 shown in FIG. 4A + O, 4A-O, 4B + P, 4B-P, 4C + Q, 4C-Q, 4D + R, 4D-R, 4E + S, 4E-S, which are binary data. As described above, from the first signal sequence 83, either the first data sequence 31 shown in FIG. 2 or the third data sequence 35 shown in FIG. 2 can be demodulated.

  The second signal string 85 is the same as the second signal string 69 shown in FIG. That is, the second signal sequence 85 corresponds to the data delay signal sequence 61 sent from the data delay unit 51 to the subtraction processing unit 77 shown in FIG. 4A + O, 4A-O, 4B + P, 4B-P, 4C + Q, 4C-Q, 4D + R, 4D-R, 4E + S, 4E-S are included.

  The third signal sequence 87 corresponds to, for example, the subtraction signal sequence 79 sent from the subtraction processing unit 77 shown in FIG. That is, the subtraction processing unit 77 subtracts the first signal sequence 83 (the demodulated signal sequence 59 shown in FIG. 3) from the second signal sequence 85 (data delay signal sequence 61 shown in FIG. 3). A third signal sequence 87 (subtraction signal sequence 79 shown in FIG. 5) is generated. In the third signal sequence 87, * indicates a location where the value at the timing of subtraction is unknown.

  The data string 89 corresponds to the data string 81 output through the data output terminal 57 from the data capture identifying unit 55 shown in FIG. This data sequence 81 is obtained by the data capture identifying unit 55 by alternately capturing and binarizing the first data from the subtraction signal sequence 79 sent from the subtraction processing unit 77.

  FIG. 7 is a block diagram showing an overall configuration of a second modification of the data reception facility provided in the data transmission / reception system according to the first embodiment of the present invention.

  The data receiving facility according to this modification is provided with a data delay addition / subtraction device 91 in place of the data delay addition processing device 43 shown in FIG. 3 or the data delay subtraction processing device 77 shown in FIG. 3 is different from the data receiving facility shown in FIG. 3 and the data receiving facility shown in FIG. Since other configurations are the same as those of the data receiving equipment shown in FIGS. 3 and 5, the same components as those shown in FIGS. 3 and 5 are denoted by the same reference numerals in FIG. The detailed description of is omitted.

  In addition, the data delay addition / subtraction device 91 includes an addition processing unit 93, a subtraction processing unit 95, a first data capture identifying unit 97, a second data capture identifying unit 99, and a first data output. It differs from the data delay addition processing device 43 shown in FIG. 3 and the data delay subtraction processing device 75 shown in FIG. 5 in that a terminal 101 and a second data output terminal 103 are provided. Since the data delay unit is the same as that shown in FIGS. 3 and 5, the same reference numeral 51 is assigned thereto.

  In the data delay addition / subtraction device 91, the addition processing unit 93 receives the demodulated signal sequence 59 sent from the demodulator 49 and the data delay signal sequence 61 sent from the data delay unit 51, and receives the demodulated signal sequence 59. In addition, an addition signal sequence 63 is generated by adding the data delay signal sequence 61. Then, the addition signal sequence 63 is sent to the first data capture identifying unit 97.

  The first data capture identifying unit 97 performs a binarization process on the addition signal sequence 63 transmitted from the addition processing unit 93 to generate a data sequence 65, and the data sequence 65 is converted into the first data Output through the output terminal 101.

  On the other hand, the subtraction processing unit 96 inputs the demodulated signal sequence 59 sent from the demodulating unit 49 and the data delay signal sequence 61 sent from the data delay unit 51, and receives the demodulated signal sequence 59 from the data delayed signal sequence 61. By subtracting, a subtraction signal string 79 is generated. Then, the subtraction signal string 79 is sent to the second data capture identifying unit 99.

  The second data capture identifying unit 99 performs a binarization process on the subtraction signal sequence 79 sent from the subtraction processing unit 95 to generate a data sequence 81, and the data sequence 81 is converted into the second data Output through the output terminal 103.

  The above-described data string 65 corresponds to the data string 21 input to the double identical data processing device 1 from the data input terminal 11 shown in FIG. 1, that is, the first data string 31 shown in FIG. . On the other hand, the above-described data string 81 corresponds to the data string 25 input to the double inversion data processing device 3 from the data input terminal 13 shown in FIG. 1, that is, the third data string 35 shown in FIG. ing.

  As described above, according to the first embodiment of the present invention, the data receiving facility shown in FIG. 3 transmits the data shown in FIG. 1 when reproducing one of the two data series. When the signal sent twice from the equipment through the communication satellite 9 with the same data is subjected to addition processing by the addition processing unit 53, the other data series sent from the data transmission equipment through the communication satellite 9 as inverted data. The input can theoretically be ignored.

  In the data reception facility shown in FIG. 5, when the other data series is reproduced, the subtraction processing unit 77 subtracts the signal transmitted twice from the data transmission facility through the communication satellite 9 as inverted data. In addition, the input of the one data series transmitted in the same data from the data transmission facility through the communication satellite 9 can theoretically be ignored.

  Therefore, according to the above-described first embodiment of the present invention, in two data sequences transmitted from the data transmission facility to the data reception facility in the same band and within the same time, between the two data sequences. By eliminating the interference that may occur in the above, it is possible to expect the effect that both data series can be received.

  Further, both the signal and the noise are added by the addition process at the data receiving facility shown in FIG. 3 and the subtraction process at the data receiving facility shown in FIG. However, while the signals are voltage-added with the same signal, the noise is random and power is added. Therefore, a 3 dB noise suppression effect can also be achieved.

  In order to transmit two data series, there are transmission systems such as frequency multiplexing and time division multiplexing. In the first embodiment of the present invention described above, each of the two data series is frequency-division multiplexed using the frequency band divided in half in order to send data twice at a transmission rate twice the normal rate. Transmission can be performed in the same manner as in the first embodiment, even with a transmission method or a time division multiplexing transmission method in which each of the two data series is alternately transmitted at a transmission rate twice the normal rate.

  Furthermore, in the first embodiment of the present invention, the modulation scheme (for example, BPSK to QPSK) with good transmission efficiency can be changed by the noise suppression effect. In addition, due to this noise suppression effect, the frequency amount multiplex method using the frequency band divided in half has the same amount of noise, so that a modulation method with the same degree of transmission efficiency is used. In the first embodiment of the present invention, since the bandwidth is spread twice by sending the signal twice, the power required for signal transmission per reference bandwidth (per hertz) is reduced. Since half the electric power required for normal signal transmission is sufficient, an effect of suppressing the intensity of radio waves on the earth can be expected.

  FIG. 8 is a diagram showing a simulated frequency arrangement example related to the operation of the data transmission equipment and the data reception equipment constituting the data transmission / reception system according to the first embodiment of the present invention. In other words, FIG. 8 is a diagram schematically showing a frequency spectrum before demodulation of a received signal in the data reception facility shown in FIG. 3, FIG. 5, or FIG.

  In FIG. 8, frequency is set on the horizontal axis, and signal (and noise) intensity is set on the vertical axis.

  In FIG. 8A, a trapezoidal region 111 that reaches a reference line 109 from a reference line (hereinafter referred to as “reference line”) 105 of signal (and noise) intensity has the same modulation signal spectrum as a reference. A trapezoidal region 113 extending from the line 105 to the reference line 109 indicates a general modulation spectrum of one modulation signal. Here, one modulation signal corresponds to, for example, the data string 21 input from the data input terminal 1 shown in FIG.

  A trapezoidal region 115 reaching the reference line 107 from the reference line 105 is the other modulation signal spectrum, and a trapezoidal region 117 reaching the reference line 107 from the reference line 105 is a general modulation of the other modulation signal. Each spectrum is shown. Further, a rectangular region 119 reaching the reference line 105 from the horizontal axis indicates noise. Here, the other modulation signal corresponds to, for example, the data string 27 input from the data input terminal 13 in the data transmission equipment shown in FIG.

  Next, a trapezoidal region 121 extending from above the reference line 105 to above the reference line 109 represents a simulated spectrum of one modulation signal spectrum 111 based on the demodulation result in the above-described data reception facility (shown in FIG. 3). A trapezoidal region 123 extending from above the reference line 105 to above the reference line 107 represents the simulated spectrum of the other modulation signal spectrum 115 by the demodulation result in the above-described data receiving facility (shown in FIG. 5). Show. In addition, a rectangular region 125 extending from the horizontal axis to above the reference line 105 represents a simulated spectrum of the noise 119 based on the demodulation result in the above-described data reception facility (shown in FIG. 3 or FIG. 5).

  Next, a trapezoidal region 127 reaching the reference line 109 from above the horizontal axis shows a spectrum display by general modulation of the simulated spectrum 121, and a trapezoidal region 129 reaching the reference line 107 from above the horizontal axis is simulated. A spectral display by general modulation of the spectrum 123 is shown respectively. Further, a rectangular area 131 elongated in the horizontal axis direction from the horizontal axis to the lower side of the reference line 105 represents a noise display by general modulation by general modulation of the simulated noise spectrum 125.

  In FIG. 8B, a trapezoidal region 137 reaching the reference line 135 from above the horizontal axis indicates the level change spectrum display of the spectrum display 127 shown in FIG. 8A, and the reference line 133 from above the horizontal axis. A trapezoidal region 139 that reaches 1 indicates the level change spectrum display of the spectrum display 129 shown in FIG. Further, the trapezoidal region 141 reaching the reference line 135 from the reference line 105 is one modulation signal spectrum whose level is changed, and the trapezoidal region 143 reaching the reference line 133 from the reference line 105 is the other modulation whose level is changed. The signal spectrum is shown respectively.

  One modulation signal spectrum 111 described above is a signal spectrum modulated only by the data string 21 input from the data input terminal 11 shown in FIG. 1 to the data transmission facility, and the other modulation signal spectrum 115 is a data input terminal. 13 shows signal spectra modulated only by the data string 25 input from 13 to the data transmission facility. The noise 119 indicates noise that is equivalently increased because the signal transmitted from the data transmission facility has weakened the radio wave intensity by passing through the communication satellite 9.

  In the first embodiment of the present invention, in order to send the same data string as it is or after being inverted and sent twice, a frequency bandwidth twice as large as that of a general modulation signal is required. A frequency spectrum in the case of using a general modulation scheme is indicated by a general modulation spectrum 113 of one modulation signal and a general modulation spectrum 117 of the other modulation signal. In this case, since the bandwidth is half, another band can be used as shown in FIG.

  In the first embodiment of the present invention, in the data receiving facility, the signal is voltage-added in order to return to the data after performing the addition process or the subtraction process on the same data that is the same or reversed and sent twice. The noise is increased by 3 dB by adding power. The situation is illustrated by a simulated spectrum 121 obtained by demodulating one modulated signal spectrum 111 in the data receiving facility and a simulated spectrum 123 obtained by demodulating the other modulated signal spectrum 115 in the data receiving facility. .

  With respect to the reference line 109, the simulated spectrum 121 obtained by demodulating one modulated signal spectrum 111 at the data receiving facility has a value of 6 dB, and with respect to the reference line 107, the data of the other modulated signal spectrum 115 is the above data. The simulated spectrum 123 based on the demodulation result of the receiving facility has a value on 6 dB, and the noise 119 has a value on 3 dB with respect to the reference line 105. From this situation, the relative level is displayed by lowering by 6 dB. The spectrum display 127 by the general modulation of the simulated spectrum 121, the spectrum display 129 by the general modulation of the simulated spectrum 123, and the noise display 131 by the general modulation of the simulated noise spectrum 125 are displayed. It is.

  This display shows that the use of the data receiving facility according to the first embodiment of the present invention has a 3 dB noise suppression effect as compared with the case of the general data receiving facility. Due to this noise suppression effect, a change to a modulation scheme (for example, BPSK to QPSK) having better transmission efficiency than the time division multiplexing transmission scheme can be considered. However, since one modulation signal spectrum 111 and the other modulation signal spectrum 115 are transmitted in the same band, one signal level is lower than the other signal (in the example of FIG. 1, it is 4 to 1). Therefore, in the addition of one modulation signal spectrum 111 and the other modulation signal spectrum 115, the above explanation is satisfied. However, if the level is the same, the signal level Is also increased by 3 dB, so the above advantage is lost. Also, since one modulation signal spectrum 111 and the other modulation signal spectrum 115 are transmitted in the same band, prevention of interference occurring between these signals is an important solution. This problem can be solved theoretically by performing demodulation using the data receiving facility according to the first embodiment of the present invention, but the actual propagation path has other factors such as reflection. Therefore, the data reception facility according to the first embodiment of the present invention is suitable for a data transmission / reception system using a quasi-zenith satellite with few such elements.

  On the other hand, lowering the modulation signal level in consideration of the noise suppression effect 3 dB can be considered. A spectrum whose relative level is lowered by 3 dB is a level change spectrum display 137 of the spectrum display 127 and a level change spectrum display 139 of the spectrum display 129. The reference line 135 is set to the reference line 109, the reference line 133 is set to the reference line 107, and the noise display 131 by the general modulation whose noise level is 3 dB lower than the noise 119 to the reference line 105 is set to 3 dB lower.

  The spectrum of one modulation signal spectrum 141 whose level has been changed by the data receiving facility and the other modulation signal spectrum 143 whose level has been changed is a general modulation spectrum 113 of one modulation signal which is a general modulation spectrum. FIG. 6 shows a comparison with a general modulation spectrum 117 of the other modulation signal.

  There are a level change spectrum display 137 and a level change spectrum display 139 for a noise display 131 by general modulation whose noise level is 3 dB lower than the noise 119. One modulation signal spectrum 141 whose level has been changed by the data receiving facility at that level and the other modulation signal spectrum 143 whose level has been changed are this. That is, the general modulation spectrum 113 of one modulation signal, which is a general modulation spectrum, is compared with the general modulation spectrum 117 of the other modulation signal, and is 3 dB lower. As a result, signal transmission can be performed with half the power per reference bandwidth (per hertz), and the intensity of radio waves on the earth can be suppressed. However, in the example of FIG. 1, since the ratio is 4 to 1, the power increase of 0.2 to 0.3 dB is obtained by adding one level of the modulation signal spectrum 141 and the other level of the modulation signal spectrum 143. Therefore, compared to the general modulation spectrum 113, the power density per band of 2.7 to 2.8 dB is low.

  As described above, when one signal level is lower than the other signal (in the example of FIG. 1, the ratio is 4 to 1, so the addition of one modulation signal spectrum 111 and the other modulation signal spectrum 115 is 0. 1 to 0.3 dB), the above-described effect appears. Therefore, the data string 21 input from the data input terminal 11 to the data transmission equipment in FIG. 1 and the data input terminal 13 to the data transmission equipment. When the input data string 25 is similar data, the transmission error of either one of the data strings becomes large (in general, the signal amplitude at the time of addition is lower, in the example of FIG. Since the data string 25) is input from the data input terminal 13 to the data transmission facility, a signal with a high signal amplitude is a general time division multiplex (TDM) data, and a data with a low signal amplitude is a code division. Multiplex (C ode Division Multiple (CDM) data. Alternatively, both of them may be code division multiplexed data, in which a signal having a high signal amplitude is used as data having a low spreading gain, and data having a low signal amplitude is used as data having a high spreading gain.

  FIG. 9 is a block diagram showing the overall configuration of the data transmission facility provided in the data transmission / reception system according to the second embodiment of the present invention.

  The data transmission facility according to the present embodiment includes a data multiplexer 153 having a multiplexed data input terminal 151 on the data input terminal 11 side, and a data multiplexer 157 having a multiplexed data input terminal 155 on the data input terminal 13 side. It differs from the configuration of the data transmission facility shown in FIG. 1 in that each is connected. Since other configurations are the same as those of the data transmission facility shown in FIG. 1, the same components as those shown in FIG. 1 are denoted by the same reference numerals in FIG. 9, and detailed descriptions thereof are omitted.

  The data transmission facility shown in FIG. 9 performs time division multiplexing (TDM) processing of data suitable for the communication service to the in-vehicle terminal on the data multiplexing device 155 side, for example, while the data multiplexing device 157 side performs the mobile terminal Performs code division multiplexing (CDM) processing with a high spreading ratio suitable for communication services. For mobile terminals with low antenna gain, data that has been subjected to CDM processing (high spreading ratio) is more suitable.

  In FIG. 9, the data input from the multiplexed data input terminal 151 is subjected to time division multiplexing (TDM) processing in the data multiplexer 153, and the data string 21 is sent from the data input terminal 11 to the double identical data processing apparatus 1. Entered. On the other hand, the data input from the multiplexed data input terminal 155 is code division multiplexed (CDM) in the data multiplexer 157 and is input from the data input terminal 13 to the double inverted data processing device 3 as the data string 25. Subsequent processing operations are the same as those described in the data transmission facility shown in FIG.

  In general, when data is transmitted by TDM and CDM using the same bandwidth, data transmitted to the same user (for example, both the data transmission destination in TDM and the data transmission destination in CDM are one user) If the CDM performs 100 times spreading, the data transmission speed of the CDM is slower than that of the TDM (1/100), but the noise strength is 100 times. If the data in TDM and the data in CDM are added and transmitted 10 to 1, the data in CDM is regarded as noise interference under 10 dB in the demodulation of data in TDM, and the data in CDM In the demodulation, the data in the CDM is 1/10 of the data in the TDM, but the data is returned to the demodulated data by the spreading gain of 100 times (demodulated). In the demodulation of data in the CDM, the data in the TDM is regarded as noise interference under 10 dB.

  Therefore, as described above, data in TDM is used for communication services to in-vehicle terminals, and data in CDM having a high spreading ratio is used for communication services to portable terminals having a low antenna gain.

  As described above, in the data receiving facility according to the present invention, when one of the two data sequences is reproduced, the data is transmitted twice from the data transmitting facility shown in FIG. Similarly, when the addition signal is added by the addition processing unit 53, the input of the other data series transmitted as inverted data from the data transmission facility through the communication satellite 9 can be theoretically ignored.

  In the data reception facility shown in FIG. 5, when the other data series is reproduced, the subtraction processing unit 77 subtracts the signal transmitted twice from the data transmission facility through the communication satellite 9 as inverted data. In addition, the input of the one data series transmitted in the same data from the data transmission facility through the communication satellite 9 can theoretically be ignored.

  Therefore, in the two data sequences transmitted from the data transmission facility to the data reception facility within the same time in the same band, both data sequences are eliminated by eliminating interference that may occur between both data sequences. Is not regarded as noise interference, it can be expected that both data series can be received.

  It should be noted that the data input from the multiplexed data input terminal 151 to the data multiplexer (TDM) 153, the data input from the multiplexed data input terminal 155 to the data multiplexer (CDM) 157, and the double identical data processing device 1 The relationship with the double inverted data processing device 3 may be a combination opposite to the configuration shown in FIG. 9, but in the addition processing in the addition processing device 5, the one with the larger amplitude (in this example, the quadruple side) It is also possible to assign the data multiplexed by TDM and the data multiplexed by CDM to the smaller amplitude (in this example, the 1 × side).

  As a multiplexing method for data input from the multiplexed data input terminal 151 to the data multiplexer 153 and data input from the multiplexed data input terminal 155 to the data multiplexer 157, both data are code division multiplexed ( As for the CDM data, a signal having a high signal amplitude may be data having a small spreading gain, and data having a low signal amplitude may be data having a high spreading gain.

  FIG. 10 is a block diagram showing an overall configuration of a data reception facility provided in the data transmission / reception system according to the second embodiment of the present invention.

  The data receiving facility according to the present embodiment includes a data separator 159 having a separated data output terminal 161 on the data output terminal 101 side, and a data separator 163 having a separated data output terminal 165 on the data output terminal 103 side. It is different from the configuration of the data receiving facility shown in FIG. Since other configurations are the same as those of the data receiving facility shown in FIG. 7, the same components as those shown in FIG. 7 are denoted by the same reference numerals in FIG. 10 and their detailed explanations are omitted.

  In FIG. 10, time-division multiplexed (TDM) data output from one data output terminal 101 of the data delay addition / subtraction processing device 91 and the other data output terminal 103 of the data delay addition / subtraction processing device 91 are displayed. Data separation processing is performed on both of the code division multiplexed (CDM) data output from the above.

  In FIG. 10, data output from one data output terminal 101 of the data delay addition / subtraction processing device 91 is sent to the data separation device 159. The data is time-division multiplexed (TDM) data. In the data separation device 159, data required by the user is separated from the data, and the separated data is sent from the separated data output terminal 161. Is output.

  On the other hand, the data output from the other data output terminal 103 of the data delay addition / subtraction processor 91 is sent to the data separator 163. The data is code division multiplexed (CDM) data. In the data separation device 163, the data required by the user is separated from the data, and the separated data is sent from the separated data output terminal 165. Is output.

  FIG. 11 is a block diagram showing an overall configuration of a first modification of the data reception facility provided in the data transmission / reception system according to the second embodiment of the present invention.

  In the data receiving facility according to this modification, the subtraction processing unit 95, the data capture identifying unit 99, and the data output terminal 103 are removed from the data delay addition / subtraction processing device 91 shown in FIG. The configuration differs from the data receiving facility shown in FIG. 10 in that the data separation device 163 having the terminal 165 is removed.

  In FIG. 11, data output from the data output terminal 101 of the data delay addition processing device 43 is sent to the data separation device 159. The data is time-division multiplexed (TDM) data. In the data separation device 159, data required by the user is separated from the data, and the separated data is sent from the separated data output terminal 161. Is output.

  FIG. 12 is a block diagram showing an overall configuration of a second modification of the data reception facility provided in the data transmission / reception system according to the second embodiment of the present invention.

  In the data receiving facility according to this modification, the addition processing unit 93, the data capture identifying unit 97, and the data output terminal 101 are removed from the data delay addition / subtraction processing device 91 shown in FIG. The configuration differs from the data receiving equipment shown in FIG. 10 in that the data separation device 159 having the terminal 161 is removed.

  In FIG. 12, the data output from the data output terminal 103 of the data delay subtraction processing device 75 is sent to the data separation device 163. The data is code division multiplexed (CDM) data. In the data separation device 163, data required by the user is separated from the data, and the separated data is sent from the separated data output terminal 165. Is output.

  As described above, as shown in FIG. 9 to FIG. 12, in the present invention, the TDM data and the CDM data are transmitted with the same bandwidth, the CDM data with a small spreading gain, and the spreading gain. It is also possible to transmit with high CDM data, and it is theoretically possible to eliminate interference between data transmitted with the same bandwidth, so both signals (data) are considered noise interference. Therefore, there is an effect that the relationship between the CDM spreading ratio and the signal level difference can be ignored.

  FIG. 13 is a block diagram showing the overall configuration of the data transmission facility provided in the data transmission / reception system according to the third embodiment of the present invention.

  The data transmission facility according to the present embodiment replaces the double identical data processing device 1 shown in FIG. 9 with an N data delay double identical data processing device 171 as a double inverted data processing device 3 shown in FIG. Instead, the N data delay double identical data processing device 173 is provided, which is different from the data transmission equipment shown in FIG. Since other configurations are the same as those of the data transmission facility shown in FIG. 9, the same components as those shown in FIG. 9 are denoted by the same reference numerals in FIG. 13 and their detailed explanations are omitted.

  The N data delay double identical data processing device 171 is subjected to time division multiplexing (TDM) processing in the data multiplexing device 153, and the data string 21 sent from the data multiplexing device 153 through the data input terminal 11 is converted into N data periods. Data processing is performed after the delay. The N data delay double identical data processing device 173 is subjected to code division multiplexing (CDM) processing in the data multiplexing device 157, and the data string 25 transmitted from the data multiplexing device 157 through the data input terminal 13 is converted into N data periods. Data processing is performed after the delay.

  FIG. 14 is a data sequence diagram illustrating an example of data employed in a data transmission facility provided in a data transmission / reception system according to the third embodiment of the present invention.

  In the data sequence diagram shown in FIG. 14, four data strings and one signal string are set. Of the four data strings, the first data string and the third data string are the same as the first data string 31 and the third data string 35 shown in FIG. Therefore, the first data string and the third data string in FIG. 14 are also denoted by the same reference numerals as those shown in FIG. 2 and their detailed description is omitted.

  In FIG. 14, the second data string 175 corresponds to the data string 181 output from the N data delay double identical data processing device 171 shown in FIG. 13, for example, and the length of the second data string 175 Is the same as the length of the first data string 31. The second data string 175, that is, the data string 181 shows an example where N = 5. In the same data processing device 171 with N data delay twice, each binary data A, B, C, D, and E constituting the first data string 31 is repeated twice at twice the normal data transmission rate. By sending, the binary data A, B, C, D, E are arranged in the order of A, B, C, D, E, A, B, C, D, E as shown in FIG. It has been done.

  Next, the fourth data string 177 corresponds to the data string 183 output from, for example, the N data delay double inversion data processing device 173 shown in FIG. 13, and the length of the fourth data string 177 is The length of the third data string 35 is the same. The fourth data string 177, that is, the data string 183 shows an example where N = 5. In the N data delay double inverted data processing device 173, the non-inverted data of the binary data O, P, Q, R, and S constituting the third data string 35 and the inverted data -O,- P, -R, -S are output in the order of O, P, Q, R, S, -O, -P, -Q, -R, -S, and twice the normal data transmission rate. As a result, as shown in FIG. 2, they are arranged in the order of O, P, Q, R, S, -O, -P, -Q, -R, and -S.

  Next, the signal sequence 179 corresponds to, for example, the signal sequence 185 output from the addition / synthesis processing device 5 shown in FIG. 13, and the length of the signal sequence 179 is the first to fourth data sequences ( 31, 175, 35, 177). In the addition synthesis processing device 5, the signal sequence 179 is transmitted from the second data sequence 175 that is the data sequence 181 output from the N data delay double identical data processing device 171 and from the N data delay double inverted data processing device 173. The fourth data string 177, which is the data string 183 to be output, is generated by adding the former with 4 and the latter with an addition ratio of 1 (addition ratio 4: 1). As shown in FIG. 14, the signal sequence 179 is binary data 4A + O, 4B + P, 4C + Q, 4D + R, 4E + S, 4A−O, 4B−P, 4C−, which is binary data subjected to addition / synthesis processing in the addition / synthesis processing device 5. Q, 4D-R, 4E-S.

  The signal sequence 179 is 4A, 4A, which is four times the binary data A, B, C, D, E, A, B, C, D, E constituting the second data sequence 175. 4B, 4B, 4C, 4C, 4D, 4D, 4E, and 4E, and the binary data O, P, Q, R, S, -O, -P, -Q, and-constituting the fourth data string 177 R and −S are analogly added in the addition / synthesis processing device 5. For this reason, the signal sequence 179 is replaced with 4A + O, 4B + P, 4C + Q, 4D + R, 4E + S, 4A-O, 4B-P, 4C-Q, 4D-R, 4E-S, which are the added and combined values of the above binary data. 4 + 1, 4-1, -4 + 1, -4-1, that is, four values of 5, 3, -3, and -5.

  FIG. 15 is a block diagram showing an overall configuration of a data reception facility provided in a data transmission / reception system according to the third embodiment of the present invention.

  The data reception facility according to this embodiment is different from the data reception facility shown in FIG. 11 in that an N data delay addition processing device 187 is provided instead of the data delay addition processing device 43 shown in FIG. About another structure, it is the same as that of the data reception equipment shown in FIG. The N data delay addition processing device 187 is different from the data delay addition processing device 43 shown in FIG. 11 in that an N data delay unit 189 is provided in place of the data delay unit 51 shown in FIG. Other configurations are the same as those of the delay addition processing device 43 shown in FIG. Therefore, in FIG. 15, the same components as those shown in FIG. 11 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The N data delay unit 189 delays the data transmitted from the demodulator 49 by N data periods, and then transmits the data to the addition processing unit 53. The data capture identifying unit 97 receives the addition signal sequence 201 sent from the addition processing unit 53 and captures the next N data obtained by removing N data from the first data in the addition signal sequence 201. Then, the fetched N data is binarized to generate a data string 203, and the data string 203 is sent to the data separator 159 through the data output terminal 101.

  FIG. 16 is a data sequence diagram illustrating an example of data employed in a data reception facility provided in a data transmission / reception system according to the third embodiment of the present invention.

  In the example illustrated in FIG. 16, three signal sequences are set as a first signal sequence 191, a second signal sequence 193, and a third signal sequence 195. Also, one column indicated by reference numeral 197 is set for the data sequence.

  16, the first signal sequence 191 is, for example, the demodulated signal sequence 59 sent from the demodulator 49 to the N data delay unit 189 and the addition processing unit 53 shown in FIG. 15, that is, the demodulated signal sequence 59 shown in FIG. 4A + O, 4B + P, 4C + Q, 4D + R, 4E + S, 4A-O, 4B-P, 4C-Q, 4D-R, and 4E-S. From the first signal sequence 191, either the first data sequence 31 shown in FIG. 14 or the third data sequence 35 shown in FIG. 14 can be demodulated.

  The second signal sequence 193 corresponds to the N data delay signal sequence 199 sent from the N data delay unit 189 shown in FIG. 15 to the addition processing unit 53, for example, and is binary data 4A + O, 4B + P. 4C + Q, 4D + R, 4E + S, 4A-O. Unlike the first signal sequence 191, the second signal sequence 193 does not include 4B-P, 4C-Q, 4D-R, and 4E-S.

  The third signal sequence 195 corresponds to, for example, the addition signal sequence 201 sent from the addition processing unit 53 shown in FIG. That is, the addition processing unit 53 adds the second signal sequence 193 (N data delay signal sequence 199 shown in FIG. 15) to the first signal sequence 191 (the demodulated signal sequence 59 shown in FIG. 15). Thus, the third signal sequence 195 (addition signal sequence 201 shown in FIG. 15) is generated. The third signal sequence 195, that is, the data sequence 201 shows an example where N = 5. In the third signal sequence 195, * indicates a location where the value at the timing of addition is unknown.

  The data string 197 corresponds to, for example, the data string 203 output from the data capture identifying unit 97 shown in FIG. This data sequence 203 is obtained by the data capture identifying unit 97 by alternately capturing and binarizing from the first data from the addition signal sequence 201 sent from the addition processing unit 53. The data string 197 is input from the data input terminal 151 to the N data delay double identical data processing device 171 in the first data string 31 shown in FIG. 14, that is, the data transmission facility shown in FIG. This corresponds to the data string 21.

  FIG. 17 is a block diagram showing an overall configuration of a first modification of the data reception facility provided in the data transmission / reception system according to the third embodiment of the present invention.

  The data reception facility according to this modification is different from the data reception facility shown in FIG. 12 in that an N data delay subtraction processing device 205 is provided instead of the data delay subtraction processing device 75 shown in FIG. About another structure, it is the same as that of the data reception equipment shown in FIG. The N data delay subtraction processing device 205 is different from the data delay subtraction processing device 75 shown in FIG. 12 in that an N data delay unit 189 is provided in place of the data delay unit 51 shown in FIG. Other configurations are the same as those of the data delay subtraction processing device 75 shown in FIG. Therefore, in FIG. 17, the same components as those shown in FIG. 12 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The N data delay unit 189 delays the data transmitted from the demodulation unit 49 by N data periods, and then transmits the data to the subtraction processing unit 77. The data capture identifying unit 99 receives the subtraction signal sequence 207 sent from the subtraction processing unit 77 and captures the next N data obtained by removing N data from the first data in the subtraction signal sequence 207. Then, the fetched N data is binarized to generate a data string 209, and the data string 209 is sent to the data separator 163 through the data output terminal 103.

  FIG. 18 is a data sequence diagram illustrating an example of data employed in the first modification of the data reception facility provided in the data transmission / reception system according to the third embodiment of the present invention.

  In the data sequence diagram shown in FIG. 18, three signal columns and one data column are set. Of the three signal trains, the first signal train and the second signal train are the same as the first signal train 191 and the second signal train 193 shown in FIG. Therefore, the first signal sequence and the second signal sequence in FIG. 18 are also given the same reference numerals as those shown in FIG. 16, and detailed descriptions thereof are omitted.

  In FIG. 18, the third signal sequence 211 corresponds to, for example, the subtraction signal sequence 207 sent from the subtraction processing unit 77 shown in FIG. That is, the subtraction processing unit 77 subtracts the first signal sequence 191 (the demodulated signal sequence 59 shown in FIG. 17) from the second signal sequence 193 (N data delay signal sequence 199 shown in FIG. 17). The third signal sequence 211 (the subtraction signal sequence 207 shown in FIG. 17) is generated. The third signal sequence 211, that is, the data sequence 207 shows an example where N = 5. In the third signal sequence 211, * indicates a location where the value at the timing of subtraction is unknown.

  The data string 213 corresponds to, for example, the data string 209 output from the data capture identifying unit 99 shown in FIG. The data string 209 is binarized by the data capture identifying unit 99 by capturing the next N data after subtracting N data from the first data from the subtraction signal string 207 sent from the subtraction processing unit 77. Can be obtained. The data string 213 is input from the data input terminal 13 to the N data delay double inverted data processor 173 in the third data string 35 shown in FIG. 14, that is, in the data transmission facility shown in FIG. This corresponds to the data string 25.

  FIG. 19 is a block diagram showing an overall configuration of a second modification of the data reception facility provided in the data transmission / reception system according to the third embodiment of the present invention.

  The data receiving facility according to this modification is configured by replacing the N data delay addition processing device 187 shown in FIG. 15 and the N data delay subtraction processing device 205 shown in FIG. 17 with an N data delay addition / subtraction processing device 215. It differs from the data receiving equipment shown in FIGS. 15 and 17 in that it is provided. About another structure, it is the same as that of the data reception equipment shown in FIG.15 and FIG.17. Further, the N data delay addition / subtraction processing device 215 includes an N data delay unit 189 shown in FIGS. 15 and 17, an addition processing unit 53, a data capture identifying unit 97, and a data output terminal shown in FIG. 101, the subtraction processing unit 77, the data capture identifying unit 99, and the data output terminal 103 shown in FIG. Accordingly, in FIG. 19, the same components as those shown in FIGS. 15 and 17 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 19, the N data delay unit 189 delays the data transmitted from the demodulation unit 49 by N data periods, and then transmits the data to the addition processing unit 63 and the subtraction processing unit 77. The data capture identifying unit 97 receives the addition signal sequence 207 sent from the addition processing unit 53 and captures the next N data obtained by removing N data from the first data in the addition signal sequence 201. Then, the fetched N data is binarized to generate a data string 203, and the data string 203 is sent to the data separator 159 through the data output terminal 101.

  On the other hand, the data capture identifying unit 99 receives the subtraction signal sequence 207 sent from the subtraction processing unit 77 and captures the next N data obtained by removing N data from the first data in the subtraction signal sequence 207. Then, the fetched N data is binarized to generate a data string 209, and the data string 209 is sent to the data separator 163 through the data output terminal 103.

  In the technical contents shown in FIGS. 13 to 19 described above, the same effects as those shown in FIGS. 1 to 12 can be obtained.

  FIG. 20 is a block diagram showing the overall configuration of the data transmission facility provided in the data transmission / reception system according to the fourth embodiment of the present invention.

  The data transmission facility according to the present embodiment includes an error correction code adding device 217, a multiplexed data input terminal 155, a data multiplexing device (CDM) 157, between the data input terminal 11 and the twice identical data processing device 1. 9 is different from the data transmission facility shown in FIG. 9 in that an error correction code adding device 219 is interposed therebetween. Since the other configuration is the same as that of the data transmission facility shown in FIG. 9, the same components as those shown in FIG. 9 are denoted by the same reference numerals in FIG.

  In FIG. 20, an error correction code adding device 217 corrects an error correction such as a Reed-Solomon code or a convolutional code to time division multiplexed (TDM) data output from a data multiplexing device (TDM) 153 through a data input terminal 11. The code is added and output to the twice identical data processing device 1. On the other hand, the error correction code adding device 219 adds an error correction code such as a Reed-Solomon code or a convolutional code to the data input through the multiplexed data input terminal 155 and outputs the added data to the data multiplexing device (CDM) 157.

  FIG. 21 is a block diagram showing an overall configuration of a data reception facility provided in a data transmission / reception system according to the fourth embodiment of the present invention.

  The data receiving facility according to this embodiment includes an error correction code decoding device 221 and an output side of the data separation device 163 between one output side of the data delay addition / subtraction processing device 91 and one data output terminal 101. 10 and the separated data output terminal 165 are different from the data receiving equipment shown in FIG. 10 in that error correction code decoding devices 223 are respectively interposed. Since other configurations are the same as those of the data receiving facility shown in FIG. 10, the same components as those shown in FIG. 10 are denoted by the same reference numerals in FIG. 21 and their detailed explanations are omitted.

  In FIG. 21, the error correction code decoding apparatus 221 performs error correction such as Viterbi decoding or Reed-Solomon decoding on the data output from the data acquisition identifying unit 97 of the data delay addition / subtraction processing apparatus 91, and outputs the data. The data is output to the data separator 159 through the terminal 101. On the other hand, the error correction code decoding device 223 performs error correction such as Viterbi decoding and Reed-Solomon decoding on the data code division multiplexed (CDM) in the data separation device 163 and outputs the result through the separated data output terminal 165.

  FIG. 22 is a block diagram showing an overall configuration of a first modification of the data reception facility provided in the data transmission / reception system according to the fourth embodiment of the present invention.

  In the data receiving facility according to this modification, the subtraction processing unit 95, the data capture identifying unit 99, and the data output terminal 103 are removed from the data delay addition / subtraction processing device 91 shown in FIG. The configuration differs from the data receiving equipment shown in FIG. 21 in that the data separation device 163 having the terminal 165 and the error correction code decoding device 223 are removed.

  In FIG. 22, the data output from the data output terminal 101 of the data delay addition processing device 43 is subjected to error correction such as Viterbi decoding or Reed-Solomon decoding in the error correction code decoding device 221 and then passed through the data output terminal 101. The data is output to the data separator 159.

  FIG. 23 is a block diagram showing an overall configuration of a first modification of the data reception facility provided in the data transmission / reception system according to the fourth embodiment of the present invention.

  In the data receiving facility according to the present modification, the addition processing unit 93 and the data capture identifying unit 97 are removed from the data delay addition / subtraction processing device 91 shown in FIG. 21, and the error correction code decoding device 221 and the data The configuration differs from the data receiving equipment shown in FIG. 21 in that the data separation device 159 having the output terminal 101 and the separated data output terminal 161 is removed.

  In FIG. 23, the data output from the data output terminal 103 of the data delay subtraction processing device 75 is separated from the data required by the user in the data separation device 163, and the data after the separation is an error. It is sent to the correction code decoding device 223. The separated data is output through the separated data output terminal 165 after being subjected to error correction such as Viterbi decoding or Reed-Solomon decoding in the error correction code decoding apparatus 223.

  Also in the technical contents shown in FIGS. 20 to 23 described above, the same effects as those shown in FIGS. 1 to 19 can be obtained. In addition, an error correction code is added to the data string for transmission at the data transmission facility, and the data reception facility can perform error correction decoding, thereby correcting an error caused by transmission. .

  The transmitting antenna 15 and the receiving antenna 45 are described as parabolic antennas, but antennas such as patch antennas and whip antennas may be used instead of parabolic antennas.

  The preferred embodiments of the present invention have been described above, but these are merely examples for explaining the present invention, and the scope of the present invention is not limited to these embodiments. The present invention can be implemented in various other forms.

The block diagram which shows the whole structure of the data transmission equipment with which the data transmission / reception system which concerns on the 1st Embodiment of this invention is provided. The data sequence diagram which shows an example of the data employ | adopted in the data transmission equipment with which the data transmission / reception system which concerns on the 1st Embodiment of this invention is provided. The block diagram which shows the whole structure of the data reception equipment with which the data transmission / reception system which concerns on the 1st Embodiment of this invention is provided. The data sequence diagram which shows an example of the data employ | adopted in the data reception equipment with which the data transmission / reception system which concerns on the 1st Embodiment of this invention is provided. The block diagram which shows the whole structure of the 1st modification of the data reception equipment with which the data transmission / reception system which concerns on the 1st Embodiment of this invention is provided. FIG. 6 is a data sequence diagram illustrating an example of data employed in a data reception facility provided in the data transmission / reception system illustrated in FIG. 5. The block diagram which shows the whole structure of the 2nd modification of the data reception equipment with which the data transmission / reception system which concerns on the 1st Embodiment of this invention is provided. The figure which showed the simulation frequency arrangement | positioning example regarding the operation | movement of the data transmission equipment which comprises the data transmission / reception system which concerns on the 1st Embodiment of this invention, and a data reception equipment. The block diagram which shows the whole structure of the data transmission equipment with which the data transmission / reception system which concerns on the 2nd Embodiment of this invention is provided. The block diagram which shows the whole structure of the data reception equipment with which the data transmission / reception system which concerns on the 2nd Embodiment of this invention is provided. The block diagram which shows the whole structure of the 1st modification of the data reception equipment with which the data transmission / reception system which concerns on the 2nd Embodiment of this invention is provided. The block diagram which shows the whole structure of the 2nd modification of the data reception equipment with which the data transmission / reception system which concerns on the 2nd Embodiment of this invention is provided. The block diagram which shows the whole structure of the data transmission equipment with which the data transmission / reception system which concerns on the 3rd Embodiment of this invention is provided. The data sequence figure which shows an example of the data employ | adopted in the data transmission equipment with which the data transmission / reception system which concerns on the 3rd Embodiment of this invention is provided. The block diagram which shows the whole structure of the data reception equipment with which the data transmission / reception system which concerns on the 3rd Embodiment of this invention is provided. The data sequence figure which shows an example of the data employ | adopted in the data reception equipment with which the data transmission / reception system which concerns on the 3rd Embodiment of this invention is provided. The block diagram which shows the whole structure of the 1st modification of the data reception equipment with which the data transmission / reception system which concerns on the 3rd Embodiment of this invention is provided. The data sequence diagram which shows an example of the data employ | adopted in the 1st modification of the data reception equipment with which the data transmission / reception system which concerns on the 3rd Embodiment of this invention is provided. The block diagram which shows the whole structure of the 2nd modification of the data reception equipment with which the data transmission / reception system which concerns on the 3rd Embodiment of this invention is provided. The block diagram which shows the whole structure of the data transmission equipment with which the data transmission / reception system which concerns on the 4th Embodiment of this invention is provided. The block diagram which shows the whole structure of the data reception equipment with which the data transmission / reception system which concerns on the 4th Embodiment of this invention is provided. The block diagram which shows the whole structure of the 1st modification of the data reception equipment with which the data transmission / reception system which concerns on the 4th Embodiment of this invention is provided. The block diagram which shows the whole structure of the 1st modification of the data reception equipment with which the data transmission / reception system which concerns on the 4th Embodiment of this invention is provided.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Double identical data processing device 3 Double inversion data processing device 5 Addition synthetic processing device 7 Modulation transmission device 9 Communication satellite 11 Data input terminal 13 Data input terminal 15, 45 Antenna 17 Modulation unit 19 Transmission unit 41 Reception demodulation device 43 Data Delay addition processor 47 Receiving unit 49 Demodulating unit 53 Addition processing unit 55 Data acquisition identifying unit 57 Data output terminal

Claims (14)

A first data processing unit that repeatedly outputs the input data of the first data series twice within the time required for transmission of the data;
A process of outputting the input second data series data as it is within the time required for transmission of the data and a process of generating and outputting inverted data of the second data series data are executed. A second data processing unit to
The data of the first data series output from the first data processing unit and the data of the second data series output from the second data processing unit at the output timing of the data, And a data string synthesizing unit for synthesizing at a predetermined synthesis ratio;
A data transmission unit that generates a modulated wave from the data sequence after being synthesized by the data sequence synthesis unit, and transmits the modulated wave to the outside;
A data transmission device comprising: The data transmission device according to claim 1, wherein
A data transmitting apparatus, wherein data of at least one of the first and second data series is code division multiplexed data. The data transmission device according to claim 1, wherein
A data transmission apparatus, wherein one of the data series of the first and second data series is time-division multiplexed data. The data transmission device according to claim 1, wherein
A data transmission apparatus in which the data sequence is synthesized by the data sequence synthesis unit by adding the data of the first data series and the data of the second data series. The data transmission device according to claim 1, wherein
The time required to output the data of the first and second data series from the first and second data processing units is one data interval of each data constituting the first and second data strings. A data transmission device set to a time required to transmit data that is an integral multiple of. The data transmission device according to claim 1, wherein
A data transmitting apparatus for inputting data of the first and second data series to the first and second data processing sections after a predetermined error correction code is added thereto. A data reception demodulator that receives the modulated wave by the data sequence generated by combining the data of the two data series transmitted, and demodulates the data sequence generated by the combination from the modulated wave;
A data sequence output from the data reception demodulation unit, the data sequence generated by the synthesis is input, and after a predetermined time has elapsed, a data sequence delay output unit that outputs the data sequence generated by the synthesis;
A data sequence generated by the synthesis output after a predetermined time from the data sequence delay output unit and a data sequence generated by the synthesis directly output from the data reception demodulation unit are input, and the synthesis A data processing unit that performs data processing necessary to extract one of the data strings from the data string generated by
A data reproduction unit for reproducing and outputting data of the data string output from the data processing unit;
A data receiving apparatus comprising: The data receiving device according to claim 7,
The data processing necessary for extracting any one of the data strings by the data processing unit is a data string generated by the synthesis that is output after a predetermined time has elapsed from the data string delay output unit, and A data receiving apparatus which is a process of adding the data sequence generated by the synthesis directly output from the data receiving demodulation unit. The data receiving device according to claim 7,
The data processing necessary for extracting any one of the data sequences by the data processing unit is directly from the data reception demodulating unit from the data sequence output after a predetermined time has elapsed from the data sequence delay output unit. A data receiving apparatus, which is a process of subtracting the data string generated by the synthesis output to. The data receiving device according to claim 7,
The time from when the data string delay output unit inputs the data string generated by the synthesis until the data string is output is an integral multiple of one data interval of each data constituting the data string A data receiver set to the time required to transmit the data. The data receiving device according to claim 7,
A data receiving apparatus, wherein data of at least one of the two data series data is code division multiplexed data. The data receiving device according to claim 7,
A data receiving apparatus, wherein data of one of the two data series is time-division multiplexed data. The data receiving device according to claim 7,
A data receiving apparatus in which a predetermined error correction code is added to each of the data of the two data series. In the data receiving device according to claim 7 or 13,
An error correction code decoding unit for correcting an error in the data string to which the error correction code is added based on the predetermined error correction code;
When the error correction code decoding unit outputs a data sequence to which the error correction code is added from the data processing unit, the error correction code decoding unit corrects an error in the data sequence with the error correction code and then to the data reproduction unit. A data receiver that outputs data.

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