JP2003152594A - Apparatus and method for transmitting, apparatus and method for receiving, system and method for communicating, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and a method for transmission, in which a transfer rate can be accelerated, as compared with the prior art, and to provide an apparatus and a method for receiving, a system and a method for communication as well as a program. SOLUTION: A transmission data train is divided in a data-dividing unit 102, and a plurality of divided data sequences are generated. The data sequences are directly diffused in predetermined diffused code sequences in a direct diffusion processing unit 103a, to direct diffusion processing unit 104a via a transmission buffer, and thereby a plurality of diffused data sequences are generated. For impulse output unit 105a to impulse output unit 105d, modulated impulse sequences, in which the reference impulse sequences of a predetermined period are modulated in responses to the plurality of the diffused data sequences, are deviated at a timing by a predetermined time in the period, and output. The plurality of the output modulated impulse sequences are combined in a composite unit 106 and are transmitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitter and a method therefor, a receiver and a method therefor, a communication system and a method therefor, and a program. And a method thereof, a receiving device and a method thereof,
The present invention relates to a communication system, a method thereof, and a program.

[0002]

2. Description of the Related Art In addition to mobile communication devices such as mobile phones,
In recent years, wireless communication functions are being installed in personal computers, their peripheral devices, and even home electric appliances such as televisions. With the increase in the number of wireless communication devices, interference between wireless communication systems and exhaustion of available frequency resources have become problems.

Under these circumstances, a wireless communication system called UWB (ultra wideband) system, which improves the utilization efficiency of the frequency band and is less susceptible to interference from other communication systems, has recently attracted attention. FIG. 28A is a schematic diagram of a UWB wireless communication system including a transmitting terminal 1 and a receiving terminal 2. Further, FIG. 28B is a diagram for comparing the signal spectrums of the normal communication system using continuous waves and the UWB system, and the symbol C1 is the UWB system,
Reference symbol C2 indicates a signal spectrum of a communication system using continuous waves. As shown in FIG. 28A, in the UWB method, a signal is transmitted using an impulse with a very narrow pulse width (for example, 1 nsec or less). Therefore, as shown in FIG. 28B, the signal spectrum C1 of the UWB system has a wider frequency band than the signal spectrum C2 of the normal communication system (for example, the OFDM system) using continuous waves, and the signal energy is higher than that of the signal spectrum C2. Dispersed in a wide band, the signal energy of each frequency is miniaturized. Therefore, UWB
The wireless communication system of the method can share the frequency band without causing interference with other wireless communication systems,
The utilization efficiency of the frequency band can be improved.

A specific example of the signal waveform in the UWB system is
FIG. 29 shows a comparison with a signal waveform using a continuous wave. Figure 2
9A is a diagram showing a signal waveform in which a continuous wave (sine wave) is modulated by BPSK (binary phase shift keying). As shown in FIG. 29A, in BPSK, the polarity of the signal is inverted between positive and negative depending on the value of the transmission data (value “+1” or value “−1” in the example in the figure). On the other hand, a signal waveform of the UWB system in which the impulse train is modulated by BPSK is shown in FIG.
9B. Similar to the case of the continuous wave, the polarity of the impulse is inverted according to the value of the transmission data, but the signal waveform is a sharp impulse. Also, FIG. 29C
FIG. 4 is a diagram showing a UWB system signal waveform in which an impulse train is modulated by PPM (pulse position modulation). As shown in FIG. 29C, in PPM, the impulse generation position is shifted according to the value of the transmission data.

Here, a transmitter and a receiver in a conventional UWB wireless communication system will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 30 is a block diagram showing a schematic configuration of a conventional UWB transmitter.
Reference numeral 3 indicates a transmission data processing unit, reference numeral 4 indicates a transmission buffer, reference numeral 5 indicates a direct spread processing unit, and reference numeral 6 indicates an impulse generation unit.

The transmission data processing unit 3 performs a predetermined process for channel coding such as a compression process and an error correction code addition process on the input data Din. The transmission buffer 4 temporarily stores the data processed by the transmission data processing unit 3, and outputs the stored data directly to the diffusion processing unit 5 at the transmission timing of the data. The direct spread processing unit 5 multiplies a predetermined spread code sequence, which is a random code sequence such as a PN (pseudo-random noise) sequence, by the transmission data S4 input from the transmission buffer 4, and outputs an impulse as a spread data sequence S5. Output to the generation unit 6. The impulse generation unit 6 has an impulse train of a predetermined cycle modulated according to the spread data train S5 (see, for example, FIG. 29).
B or an impulse train as shown in FIG. 29C) is generated and transmitted from the antenna as a transmission signal ST.

FIG. 31 is a block diagram showing a schematic configuration of a conventional UWB type receiver. Reference numeral 7 is a correlation processing unit, reference numeral 8 is an integration unit, reference numeral 9 is a data determination unit,
Reference numeral 10 indicates a received data processing unit, respectively. The correlation processing unit 7 holds the same spreading code sequence used for direct spreading in the direct spreading processing unit 5 of FIG. 30, and detects and detects the correlation between this spreading code sequence and the received signal SR. The correlation signal S7 according to the result is output. Specifically, an impulse train corresponding to the spread code sequence and having the same cycle as the transmission signal ST is generated, and the impulse train and the reception signal SR are generated.
And are multiplied, and the multiplication result is output as a correlation signal S7.
The integrating unit 8 integrates the input correlation signal S7 for a predetermined period and outputs the integrated value S8 to the data determining unit 9. The integration period is set according to the length of the spreading code sequence. The data determination unit 9 determines the value of the received data (value “+1” or value “−1”) based on the polarity of the integrated value S8 in the integration unit 8.
To judge. The reception data processing unit 11 includes the data determination unit 9
The transmission data processing unit 3 decodes the communication path-coded reception data based on the reception data whose value has been determined in (1) to reproduce the data Dout.

Next, the communication operation by the transmitter of FIG. 30 and the receiver of FIG.
Will be described with reference to. 32 is a diagram showing signal waveforms of respective parts in the transmitter of FIG. 30 and the receiver of FIG.

The transmission data channel-coded in the transmission data processing unit 3 is temporarily stored in the transmission buffer 4 and then output to the direct spreading processing unit 5 at the transmission timing of the data. The transmission data S4 (FIG. 32A) input to the direct spreading processing unit 5 is multiplied by a predetermined spreading code sequence SD (FIG. 32B), and the multiplication result is sent to the impulse generating unit 6 as a spreading data sequence S5 (FIG. 32C). Is output.

For example, in FIGS. 32A to 32C, if the high level signal is a value "+1" and the low level signal is a value "-1", the signal data S4 is a data string of {+ 1, -1, + 1}. Is directly input to the diffusion processing unit 5. 32B
, The spreading code sequence SD is {+ 1, -1, -1, + 1, + 1, -1, + 1, + 1, -1, -1, -1, + 1, -1, + 1, + 1, -1} ... (1) is a data string having a data length of 16 and if the data of value '+ 1' is directly spread by this spreading code sequence SD, {+ 1, -1, -1, + 1, + 1, -1, + 1, + 1, -1, -1, -1, + 1, -1, + 1, + 1, -1} ・ ・ ・ (2) spread A data string is generated. Further, when the data of the value "-1" is directly spread by the same spreading code sequence SD, {-1, + 1, + 1, -1, -1, + 1, -1, -1, + 1, A diffusion data string of + 1, + 1, -1, + 1, -1, -1, + 1} (3) is generated.

An impulse train (FIG. 32D) which is modulated according to each data value of the spread data train S5, for example, the waveform shown in FIG. 29B or 29C, is generated by the impulse generator 6.
And is transmitted from the antenna as a transmission signal ST.

The transmitted transmission signal ST is superposed with various noises and is received by the receiving device (FIG. 32E). In the correlation processing unit 7, the received signal SR (FIG. 32E),
Impulse train SP corresponding to the spreading code sequence SD (see FIG.
2F), a pulse having a peak in one polarity is generated as a correlation signal S7 according to the value of the spread original data, as shown in FIG. 32G.

For example, when the impulse of the same value is multiplied in the impulse shown in FIG. 29B, the negative side portion of the impulse is folded back to the positive side, and a pulse having a peak on the positive side is generated. Also, when the impulses of different values are multiplied, the positive side part of the impulse is folded back to the negative side,
A pulse having a peak on the negative side is generated. Therefore, when the spread code sequence (1) and the impulse train of the spread data train (2) are multiplied, since these data trains have the same data value, a pulse train having a peak on the positive side is generated. On the other hand, when the spread code sequence (1) and the spread data train (3) are multiplied by the impulse train, these data trains have different data values, so that a pulse train having a peak on the negative side is generated.

However, if the phase relationship between the spread code string to be multiplied and the spread data string is deviated by one chip before and after on the transmitting side and the receiving side, the pulse train of the multiplication result has the same polarity as shown in FIG. 32G. The pulse train does not become a pulse train, and the correct correlation between the spread code train and the spread data train cannot be detected. Although not particularly shown in the block diagram of FIG. 31, a synchronization acquisition circuit that acquires a correct phase relationship between the spreading code sequence and the spreading data sequence in the initial state of the reception process, and the impulse sequence SP within one chip period of the spreading code. As a general configuration, the receiving apparatus includes a synchronization holding circuit that controls the phase of the signal and holds the synchronization state.

The correlation signal S7 generated by the correlation processing unit 7 is integrated by the integrator 8 for a period corresponding to the data length of the spreading code sequence. In the example of FIG. 32H, integration is performed only for the period of 16 pulses of the impulse train SP. The integrated value S8 is compared with a predetermined reference in the data determination unit 9, and the value of the received data (value '
+1 'or the value'-1') is determined. The reception data whose value has been determined is decoded by the reception data processing unit 11 and output as data Dout.

[0016]

By the way, the above-mentioned U
In the WB communication system, performing direct spreading by multiplying transmission information by a pseudo-random spreading code sequence is
The reason is as follows. (A) Since communication is performed using weak impulses, if information is transmitted / received with only one impulse with respect to one transmission data, the error rate of the transmission data becomes large. (B) When a perfectly periodic impulse train is transmitted,
Since energy concentrates on a specific frequency, the probability of causing interference with other communication systems increases.

However, when 1-bit transmission data is directly spread to a spread data string of a plurality of bits, the transmission rate of information decreases in proportion to the data length of the spread data string, that is, the spread rate, so that the spread rate is unsatisfactory. Making it larger than necessary is equivalent to worsening the transmission rate. For example, PAN (pe
In many cases, the distance between the transmitting and receiving terminals becomes very short in such cases as rsonal area network), and in this case, the communication state becomes better than communication at normal distance. If the communication condition becomes good, the error rate increase can be suppressed even if the spreading factor is lowered to some extent to increase the transmission rate. However, in the conventional UWB communication device, the direct spreading is performed with the same spreading factor regardless of the communication condition. Therefore, there is a problem that the transmission rate is wasted when the communication state is good.

Further, in impulse communication in which impulses are transmitted intermittently, a signalless period in which impulses are not transmitted occurs, but in a conventional UWB communication device, transmission / reception operation is stopped during this period, and Therefore, there is a problem that the transmission rate is wasted as the interval between impulses becomes wider because the transmission is not performed.

The present invention has been made in view of the above circumstances, and its first object is to provide a transmitter and a method thereof, a receiver and a method thereof, a communication system and a transmitter capable of increasing the transmission rate as compared with the prior art. To provide a method and a program. A second object is to provide a transmitter and a method thereof, a receiver and a method thereof, a communication system and a method thereof, and a program capable of changing a transmission rate according to a communication state.

[0020]

In order to achieve the above object, a transmitting apparatus according to a first aspect of the present invention is a transmitting apparatus which converts a supplied transmission data sequence into an impulse sequence and transmits the impulse sequence. , A data dividing unit that divides the transmission data string to generate a plurality of divided data strings, and a direct spreading unit that directly spreads the plurality of divided data strings with a predetermined spreading code string to generate a plurality of spread data strings. Means, and an impulse output means for outputting a modulated impulse train, in which a reference impulse train of a predetermined cycle is respectively modulated according to the plurality of spread data trains, by shifting the timing by a predetermined time within the cycle, and the output. And a synthesizing means for synthesizing the plurality of modulated impulse trains.

According to the transmitting device of the first aspect of the present invention, the transmission data string is divided by the data dividing means to generate a plurality of divided data strings. The plurality of divided data strings are directly spread by the direct spreading means with a predetermined spreading code string, thereby generating a plurality of spread data strings. In the impulse output means, a reference impulse train of a predetermined cycle is modulated in accordance with each of the plurality of spread data trains, a modulated impulse train is output by shifting the timing by a predetermined time within the cycle, and is output. The plurality of modulated impulse trains are combined by the combining means.

Further, the direct spreading means performs composite spreading based on at least two divided data strings of the plurality of divided data strings and at least two spreading code strings corresponding to each of the divided data strings and orthogonal to each other. A data sequence may be generated, in which case the impulse output means generates a modulated impulse sequence in which the polarity and amplitude of each impulse of the reference impulse sequence is modulated according to the composite spread data sequence within the period. It is also possible to shift the timing by a predetermined time and output.

A transmission method according to a second aspect of the present invention is a transmission method in which a supplied transmission data sequence is converted into an impulse sequence and transmitted, and the transmission data sequence is divided into a plurality of divided data. A sequence is generated, and the plurality of divided data sequences are directly spread by the respective predetermined spread code sequences to generate a plurality of spread data sequences, and a reference impulse sequence of a predetermined cycle is generated according to the plurality of spread data sequences. The modulated modulation impulse trains are synthesized by shifting the timing by a predetermined time within the above-mentioned cycle.

A composite spread data string is generated based on at least two split data strings of the plurality of split data strings and at least two spread code strings orthogonal to each other corresponding to the split data strings. The modulated impulse train in which the polarities and amplitudes of the impulses of the reference impulse train are modulated according to the composite spread data train may be combined by shifting the timing by a predetermined time within the cycle.

A receiving apparatus according to a third aspect of the present invention divides a transmission data string into a plurality of pieces, directly spreads the divided data string with a predetermined spreading code string, and spread data generated by the direct spreading. A modulation impulse train obtained by modulating a reference impulse train of a predetermined cycle according to a train is a receiving device for receiving a transmission signal synthesized by shifting the timing by a predetermined time within the cycle, and a predetermined spread spectrum. Correlation between a plurality of impulse trains modulated the reference impulse train according to the code train and the transmission signal,
Detecting by shifting the timing by a predetermined time in each cycle, a correlation signal generating means for generating a plurality of correlation signals according to the detection result, and an integrating means for integrating the plurality of correlation signals for a predetermined period, respectively, And a synthesizing unit for synthesizing the determined divided data sequences and reproducing the transmission data sequence according to the integrated value of the integrating unit. .

According to the receiving apparatus of the third aspect of the present invention, in the correlation signal generating means, a plurality of impulse trains obtained by modulating the reference impulse train in accordance with a predetermined spreading code train and the transmission signal. Correlation is detected by shifting the timing for each predetermined time within the above period,
A plurality of correlation signals corresponding to the detection result are generated. The plurality of correlation signals are integrated by the integrating means for a predetermined period. The data values of the plurality of divided data strings are determined by the determining means according to the integrated value of the integrating means. The transmission data string is reproduced by combining the determined divided data strings in the combining means.

A receiving apparatus according to a fourth aspect of the present invention divides a transmission data string into a plurality of pieces, directly spreads each of the divided data strings with a predetermined spreading code string, and spread data generated by the direct spreading. A modulation impulse train obtained by modulating a reference impulse train of a predetermined cycle according to the train is a receiving device that receives a transmission signal synthesized by shifting the timing by a predetermined time within the cycle, and a predetermined spread spectrum. Correlation between a plurality of impulse trains modulated the reference impulse train according to the code train and the transmission signal,
Each of the plurality of correlation signals is detected at the same timing on the transmitting side by detecting the timing by shifting the timing by a predetermined time in the cycle, and generating a plurality of correlation signals according to the detection result. Extraction means for extracting a signal corresponding to a specific bit of the spread code string for each combination of data values of divided data to be combined, and integration means for integrating the signals extracted by the extraction means for a predetermined period, respectively. Comparing the integrated values in the integrating means of a plurality of signals extracted for each combination from the same correlation signal in the extracting means,
Comparing means for outputting the integrated value selected according to the comparison result for each of the correlation signals; determining means for determining the data value of the divided data string according to the integrated value output from the comparing means; And a synthesizing unit for synthesizing the determined divided data strings and reproducing the transmission data string.

A receiving apparatus according to a fifth aspect of the present invention divides a transmission data string into a plurality of pairs of data strings, and the plurality of divided data strings pairs are directly formed by orthogonal spreading code strings forming a pair. Spreading, a plurality of modulation impulse train pairs that respectively modulated the reference impulse train of a predetermined cycle according to the plurality of spread data train pairs generated by the direct spreading,
A receiving device for receiving a transmission signal synthesized by shifting the timing by a predetermined time in each of the above periods,
Modulation in which the reference impulse train is modulated according to a first combined data train obtained by combining two data trains obtained when the data of the same value is directly spread by the spreading code train pair for each of the divided data train pairs. A first correlation signal generating means for detecting the correlation between the impulse train and the transmission signal by shifting the timing by a predetermined time within the cycle, and generating a first correlation signal corresponding to the detection result; , The reference impulse train is modulated according to a second combined data train obtained by combining two data trains obtained when data of different values are directly spread by the spreading code train pair for each divided data train pair. Detecting a correlation between the modulated impulse train and the transmission signal by shifting a timing by a predetermined time within the cycle, and generating a second correlation signal according to the detection result. The same divided data sequence as the correlation signal generating means, the first integrating means for integrating the first correlation signal for a predetermined period, and the second integrating means for integrating the second correlation signal for a predetermined period. Based on the result of comparing the integrated values of the first integrating means and the second integrating means corresponding to each other and the polarity of one integrated value selected according to the comparison result, each of the divided data. It has a judgment means for judging the data value of the column pair, and a combining means for reproducing the transmission data string by combining the judged divided data string pairs.

A receiving method according to a sixth aspect of the present invention is to divide a transmission data string into a plurality of pieces, directly spread each of the divided data strings with a predetermined spreading code string, and to spread data generated by the direct spreading. A modulation impulse sequence obtained by modulating a reference impulse sequence of a predetermined cycle according to the sequence is a receiving method for receiving a transmission signal that is synthesized by shifting the timing by a predetermined time within the above period, Correlation between a plurality of impulse trains modulated the reference impulse train according to the code train and the transmission signal,
Detecting by shifting the timing for each predetermined time within the cycle, generating a plurality of correlation signals according to the detection result, integrating the plurality of correlation signals for a predetermined period, respectively.
The data values of the plurality of divided data strings are determined according to the integrated values of the plurality of correlation signals, the determined divided data strings are combined, and the transmission data string is reproduced.

A receiving method according to a seventh aspect of the present invention is that a transmission data string is divided into a plurality of pieces, each divided data string is directly spread with a predetermined spreading code string, and spread data generated by the direct spreading is spread. A receiving method in which a modulated impulse train obtained by modulating a reference impulse train of a predetermined cycle according to a train receives a combined transmission signal with a timing shifted by a predetermined time within the cycle, and a predetermined spreading Correlation between a plurality of impulse trains modulated the reference impulse train according to the code train and the transmission signal,
Detection is performed by shifting the timing by a predetermined time in each of the above cycles, and a plurality of correlation signals are generated according to the detection result, and from each of the plurality of correlation signals, divided data that is combined at the same timing on the transmission side. For each combination of data values of, the signal corresponding to a specific bit of the spread code string is extracted, the extracted signals are respectively integrated for a predetermined period, and the signals extracted for each combination from the same correlation signal The integrated values in the integration step are compared with each other, the integrated value is selected according to the comparison result, the data value of the divided data string is determined according to the selected integrated value, and the determined divided data The columns are combined to reproduce the transmission data column.

In the receiving method according to the eighth aspect of the present invention, the transmission data string is divided into a plurality of pairs of data strings, and the plurality of divided data string pairs are directly formed by orthogonal spreading code strings forming a pair. Spread, a plurality of modulation impulse train pairs that respectively modulated a reference impulse train of a predetermined cycle according to the plurality of spread data train pairs generated by the direct spreading,
A receiving method for receiving a combined transmission signal by shifting the timing by a predetermined time in each of the above periods,
A first combined data string obtained by combining two data strings obtained when the data having the same value is directly spread by the spreading code string pair, and obtained when the data having different values are directly spread by the spreading code string pair. The correlation between the two modulated impulse trains obtained by modulating the reference impulse train according to the second combined data train obtained by combining the two data trains, and the transmission signal, within the period for each divided data train pair. At a predetermined time, the first correlation signal and the second correlation signal corresponding to the detection result are generated, and the first correlation signal and the second correlation signal are respectively generated. The result of comparing the integrated values of the first correlation signal and the second correlation signal corresponding to the same divided data string pair with each other for a predetermined period, and one selected according to the comparison result Based on the polarity of the integration value, determine the data value of each of the divided data string pairs, by combining each of the divided data string pair is the determination, for reproducing the transmission data sequence.

A communication system according to a ninth aspect of the present invention includes a first communication device for converting information into an impulse train and transmitting the information, and a second communication device for receiving the impulse train and reproducing the information. In the communication system having the above, the first communication device divides the transmitted transmission data string and generates a plurality of divided data strings, and a plurality of divided data strings, each of which spreads the divided data string in a predetermined manner. Direct spreading with a code string, a direct spreading means for generating a plurality of spread data strings, and a reference impulse string of a predetermined period is a modulated impulse string modulated according to the plurality of spread data strings,
The second communication includes: an impulse output unit that outputs a timing signal with a predetermined shift in the cycle, and a combining unit that combines the plurality of output modulated impulse sequences to generate a transmission signal. The apparatus detects the correlation between a plurality of impulse trains obtained by modulating the reference impulse train according to a predetermined spread code train and the transmitted transmission signal, by shifting the timing by a predetermined time in each of the cycles. , Correlation signal generating means for generating a plurality of correlation signals according to the detection result, integrating means for integrating the plurality of correlation signals for a predetermined period respectively, and the plurality of divided data according to the integral value of the integrating means. It includes a determination unit that determines the data value of the column, and a synthesis unit that synthesizes the determined divided data sequences and reproduces at least a part of the transmission data sequence.

The correlation between at least one impulse train obtained by modulating the reference impulse train according to a predetermined spreading code train and the transmitted transmission signal is shifted in timing by a predetermined time within the cycle. Correlation signal generation means for detecting and generating at least one correlation signal corresponding to the detection result, integration means for integrating the at least one correlation signal for a predetermined period, and the transmission according to the integrated value of the integration means. You may have a 3rd communication apparatus containing the determination means which determines the data value of at least one part of a data sequence.

Further, the second communication device comprises a measuring means for measuring a predetermined reception characteristic of the transmitted transmission signal,
Transmitting means for transmitting the measurement result of the measuring means, wherein the first communication device has a receiving means for receiving a signal transmitted from the second communication device, The data dividing unit may set the number of divisions of the transmission data string according to the measurement result included in the received signal.

A communication method according to the tenth aspect of the present invention is
A communication method of a first communication device for converting information into an impulse train and transmitting the information, and a second communication device for receiving the impulse train and reproducing the information, the first communication device comprising: The transmitted data sequence is divided, a plurality of divided data sequences are generated, and the plurality of divided data sequences are directly spread by respective predetermined spreading code sequences to generate a plurality of spread data sequences, and a reference impulse of a predetermined cycle. A modulated impulse train, the train of which is modulated in accordance with the plurality of spread data trains, is generated by combining the modulated impulse trains by shifting the timings by a predetermined time within the cycle to generate a transmission signal. Correspondence between a plurality of impulse trains obtained by modulating the reference impulse train according to the spreading code train and the transmitted transmission signal is timed for a predetermined time within the cycle. Shift detection to generate a plurality of correlation signals corresponding to the detection result, each of the plurality of correlation signals is integrated for a predetermined period, the plurality of divided data according to the integrated value of the plurality of correlation signals The data value of the column is determined, the determined divided data sequences are combined, and the transmission data sequence is reproduced.

In the second communication device, a predetermined reception characteristic of the transmitted transmission signal is measured, and the measurement result is transmitted from the second communication device to the first communication device, The number of divisions of the transmission data string may be set according to the measurement result included in the signal transmitted to the first communication device.

A program according to an eleventh aspect of the present invention is that the transmission data supplied to a processing device that processes the supplied transmission data sequence and causes the impulse generation means to generate a transmission impulse sequence according to the processing result. Split the column,
A step of generating a plurality of divided data strings, a step of directly spreading the plurality of divided data strings with a predetermined spreading code string to generate a plurality of spread data strings, and a plurality of reference impulse strings having a predetermined cycle. The modulated impulse sequence modulated according to the spread data sequence is generated by the impulse generation means, and the transmission impulse sequence is synthesized by shifting the timing by a predetermined time within the cycle. Let

In the step of generating the spread data string, at least two split data strings of the plurality of split data strings and at least two spread code strings that are orthogonal to each other and correspond to the respective split data strings. On the basis of this, a composite spread data sequence may be generated. In this case, in the step of generating the transmission impulse sequence, the polarity and amplitude of each impulse of the reference impulse sequence are modulated according to the composite spread data sequence. The impulse trains may generate a combined transmission impulse train by shifting the timing by a predetermined time within the above cycle.

A program according to a twelfth aspect of the present invention is to divide a transmission data string into a plurality of pieces, directly spread each of the divided data strings with a predetermined spreading code string, and to spread data string generated by the direct spreading. A process of reproducing a transmission data sequence by processing a transmission signal in which a modulation impulse sequence obtained by modulating a reference impulse sequence of a predetermined period according to the above is processed by shifting the timing by a predetermined time within the period. The apparatus detects the correlation between a plurality of impulse trains obtained by modulating the reference impulse train according to a predetermined spreading code train and the transmission signal, by detecting the correlation detection means by shifting the timing for each predetermined time within the cycle. Then, a step of generating a plurality of correlation signals according to the detection result, a step of integrating the plurality of correlation signals respectively for a predetermined period, Note that the method further includes the steps of determining the data values of the plurality of divided data strings according to the integrated values of the plurality of correlation signals, and synthesizing the determined divided data strings to reproduce the transmission data string. Let the process run.

A program according to a thirteenth aspect of the present invention is to divide a transmission data string into a plurality of pieces, to directly spread the divided data string with a predetermined spreading code string, and to spread the data string generated by the direct spreading. A process of reproducing a transmission data sequence by processing a transmission signal in which a modulation impulse sequence obtained by modulating a reference impulse sequence of a predetermined period in accordance with In the device, the correlation between a plurality of impulse trains obtained by modulating the reference impulse train according to a predetermined spreading code train and the transmission signal is detected by the correlation detecting means by shifting the timing by a predetermined time within the cycle. Then, the step of generating a plurality of correlation signals according to the detection result and the same timing at the transmitting side from each of the plurality of correlation signals For each combination of the data values of the divided data to be combined by the ringing, the step of extracting a signal corresponding to a specific bit of the spread code string, the step of integrating the extracted signal for a predetermined period respectively, and the same correlation Comparing the integrated values in the integration step of the signals extracted for each combination from the signals with each other, and selecting the integrated value for each of the correlation signals according to the comparison result, and according to the selected integrated value. , A process of determining the data value of the divided data string and a step of reproducing the transmission data string by combining the determined divided data strings.

A program according to a fourteenth aspect of the present invention divides a transmission data string into a plurality of pairs of data strings,
The plurality of divided data string pairs are directly spread with orthogonal spreading code strings forming a pair, and a plurality of reference impulse strings of a predetermined cycle are respectively modulated according to the plurality of spread data string pairs generated by the direct spreading. Modulation impulse train pair, processing the transmission signal synthesized by shifting the timing for each predetermined time within the period, to the processing device for reproducing the transmission data train, the same value in the spreading code train pair. A first combined data string obtained by combining two data strings obtained when the data is directly spread, and a first combined data string obtained by directly spreading the data of different values in the spreading code string pair. The correlation between the two modulated impulse trains obtained by modulating the reference impulse train in accordance with the two combined data trains and the transmission signal is calculated for each pair of the divided data trains. A step of generating a first correlation signal and a second correlation signal corresponding to the detection result by causing the correlation detection means to detect the timing by shifting the timing by a predetermined time, and the first correlation signal and the first correlation signal. The step of integrating the two correlation signals for a predetermined period, the result of comparing the integrated values of the first correlation signal and the second correlation signal corresponding to the same divided data string pair with each other, and the result of the comparison. The step of determining the data value of each of the divided data string pairs based on the polarity of one of the selected integrated values and the step of synthesizing the determined divided data string pairs to reproduce the transmission data string. And a step of performing the processing.

[0042]

DETAILED DESCRIPTION OF THE INVENTION First to seventh embodiments of the present invention will be described below with reference to the drawings. <First Embodiment> First, a transmitting apparatus according to a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic block diagram showing a configuration example of a transmission device according to the first embodiment of the present invention. Reference numeral 101 is a transmission data processing unit, reference numeral 102 is a data dividing unit, reference numeral 1
Reference numerals 03a to 103d denote transmission buffers, and reference numeral 104a.
~ Reference numeral 104d is a direct spread processing unit, reference numerals 105a to 105d are impulse output units, and reference numeral 106 is an impulse synthesis unit.

The transmission data processing unit 101 performs a predetermined process for channel coding such as a compression process and an error correction code addition process on the input data Din.

The data division unit 102 divides the data input from the transmission data processing unit 101 into four, and outputs the divided data to the transmission buffers 103a to 104d at the next stage, respectively. The division of data is performed, for example, by dividing unit data having a predetermined data length into equal parts between the most significant bit and the least significant bit. When the data input from the transmission data processing unit 101 is serial data, it may be converted into parallel data and divided.

Transmission buffer 103a to transmission buffer 10
3d temporarily stores each of the divided data divided into four by the data dividing unit 102, and stores the accumulated divided data in the direct diffusion processing unit 104a to the direct diffusion processing unit 10.
Supply to 4d.

The direct spreading processing units 104a to 104d each hold a predetermined spreading code sequence which is a random code sequence such as a PN sequence, and these spreading code sequences and the transmission buffer 103a in the preceding stage. ~ Division data S103a input from the transmission buffer 103d
-Spread data sequence S104a-Spread data sequence S104d are each generated by multiplying by the divided data 103d.
Further, the direct diffusion processing unit 104a to the direct diffusion processing unit 104.
At least some of the spreading code sequences held by d are orthogonal to each other. As will be described later, even if the modulated impulse train by the spread data train directly spread by this orthogonal spreading code sequence is combined at the same timing,
The transmitted data can be received independently.

In this specification, "spreading code sequences are in orthogonal relation to each other" means not only when spreading code sequences are in perfect orthogonal relation but also when spreading code sequence correlation is appropriately low. Also includes.

The impulse output unit 105a to the impulse output unit 105d have modulated impulse trains S105a to S105a to which the reference impulse train having a predetermined cycle is modulated according to the spread data train S104a to the spread data train S104d, respectively.
The modulated impulse train S105d is output by shifting the timing by a predetermined time within one cycle of the reference impulse train. For example, BPSK or PPM is used as the impulse train modulation method in the impulse output units 105a to 105d.

An example of a more specific configuration of the impulse output section 105a to the impulse output section 105d is shown in FIGS. 2A and 2B. In FIG. 2A, the pulse generator 10
Reference numeral 51 generates an impulse train S1051 which is a reference impulse train modulated according to the spread data train Sds output from the direct spreading processor in the preceding stage, and a delay unit 1052 modulates the impulse train S1051 with a predetermined delay. The impulse train Spulse is output to the impulse combiner 106 at the next stage. The impulse generation timing in the pulse generation unit 1051 is common to all the impulse output units,
This common timing is given a predetermined delay in each of the impulse output sections in the delay section 1052, so that the modulated impulse train S1 whose timing is shifted by a predetermined time is provided.
05a-modulation impulse train S105d is obtained.

On the other hand, in FIG. 2B, the pulse generator 10
Reference numeral 53 denotes a modulated impulse train Spulse obtained by modulating a reference impulse train according to the spread data train Sds, and a trigger signal S10.
The timing control unit 105 is generated in synchronization with the input of 54.
4 generates this trigger signal S1054 at a predetermined timing. By setting the generation timing of the trigger signal in the timing control unit 1054 for each impulse output unit, the modulated impulse train S105a to the modulated impulse train S105d whose timings are deviated by a predetermined time can be obtained.

The impulse synthesizing unit 106 includes the modulated impulse train S105a to the modulated impulse train S1 output from the impulse output unit 105a to the impulse output unit 105d.
05d is combined and transmitted from the antenna as a transmission signal ST.

Here, the operation of the transmitting apparatus of FIG. 1 having the above-mentioned configuration will be described with reference to the waveform diagrams shown in FIGS. FIG. 3 shows the signal waveforms in the direct spread processing unit 104a and the impulse output unit 105a and the direct spread signal 10 in the transmitting apparatus 1001 shown in FIG.
4B is a diagram showing an example of signal waveforms in 4b and impulse output section 105b. FIG.

The transmission data, which has been channel-coded in the transmission data processing unit 101, is divided into four in the data dividing unit 102, and is temporarily stored in the transmission buffers 103a to 103d. Then, in direct synchronization with the data transmission timing, the direct diffusion processing unit 104a-
It is directly output to the diffusion unit 104d. 3A and 3E
Are divided data S103a and divided data S, respectively.
103b is shown.

The divided data output from the transmission buffer is divided into direct spread processing units 104a to 104d.
In the above, each is multiplied by a predetermined spreading code sequence.
3B and 3F show spreading code sequence SDa and spreading code sequence SDb that are multiplied in direct spreading processing section 104a and direct spreading processing section 104b. Further, FIG. 3C and FIG. 3G show a spread data sequence S104a and a spread data sequence S104b generated as a result of the multiplication.

In the impulse output units 105a to 105d, the reference impulse sequence having a predetermined period is the spread data sequence S104a to the spread data sequence S10.
The signals are respectively modulated by 4d and are output with a timing shifted by a predetermined time within one chip period of the spreading code sequence. 3D and 3H show a modulated impulse train S105a and a modulated impulse train S105b output from the impulse output unit 105a and the impulse output unit 105b. In the example of this figure, the modulation impulse train S105a and the modulation impulse train S10
Since 5b is output at the same timing as each other, a pulse having the same polarity and a pulse having a double pulse amplitude is synthesized in the synthesized waveform as shown in FIG. 3I and a pulse having the opposite polarity is synthesized. The timing when the amplitude becomes zero occurs.

FIG. 4 shows a modulation impulse train S105a and a modulation impulse train S1 output at the same timing.
It is a figure which shows 05b and an example of the synthetic waveform. Figure 4A
And as shown in FIG. 4B, when two impulses at the same timing modulated by BPSK are combined, this two
At the timing when the two impulses have the same polarity, an impulse having a positive or negative polarity having twice the amplitude of the original impulse is generated. Further, at the timing when the two impulses have opposite polarities, the impulses of each other cancel each other, so that the amplitude of the combined impulse becomes zero.

FIG. 5 shows the output timings of the modulation impulse train S105a and the modulation impulse train S105b, and the modulation impulse train S105c and the modulation impulse train S1.
It is a figure which shows an example of the waveform of the transmission signal ST in case the output timing of 05d has shifted | deviated. Modulation impulse train S105a (FIG. 5A) and modulation impulse train S1
Since the output timing of 05b (FIG. 5B) coincides with each other, these combined waveforms (FIG. 5E) include impulses having twice the amplitude as shown in FIG. 4C. Further, since the output timings of the modulation impulse train S105c (FIG. 5C) and the modulation impulse train S105d (FIG. 5D) also match each other, their combined waveform (FIG. 5F).
Also includes an impulse having double the amplitude. Figure 5E
Further, as shown in FIG. 5F, since the two combined waveforms have the timings of impulses shifted from each other, the transmission signal ST, which is the result of further combining them, has an impulse having a doubled amplitude as shown in FIG. 5G. The impulses are overlapped with each other, and the impulses do not overlap with each other.

By the way, when the modulated impulse sequences generated by using the spreading code sequences which are orthogonal to each other are combined at the same timing, for example, as in a receiving apparatus described later,
By performing despreading using the orthogonality of spreading code sequences, it is possible to individually reproduce the original divided data string. Further, even when the modulated impulse trains at different timings are combined, it is possible to individually reproduce the original divided data trains by performing the despreading by utilizing the difference in the timings. That is, if individual modulation impulse sequences are generated by spreading code sequences that are orthogonal to each other, or if the timings of the impulses are different even if the spreading code sequences are not orthogonal, these modulation impulses are It is possible to individually reproduce the original divided data from the combined transmission signal.

Therefore, in the example of FIG. 5, the modulation impulse train S105a and the modulation impulse train S105b.
Is generated by spreading code sequences orthogonal to each other, the original two pieces of divided data can be individually reproduced on the receiving side even if the impulse timings are matched and combined as shown in the figure. Similarly, the modulated impulse train S105c
If the modulated impulse train S105d and the modulated impulse train S105d are generated by spreading code sequences orthogonal to each other, the original two divided data can be reproduced individually. Further, by utilizing the difference between the output timing of the modulation impulse train S105a and the modulation impulse train S105b and the output timing of the modulation impulse train S105c and the modulation impulse train S105d, the divided data corresponding to each output timing is individually reproduced. it can. In this way, by utilizing the orthogonality of spreading code sequences and the difference in timing of impulses, four divided data can be transmitted simultaneously, so that one transmission data is directly spread by one spreading code sequence. The data transmission rate can be quadrupled as compared with the conventional transmission device that transmits the data by transmitting.

In the above description, the case where transmission data is divided into four has been described as an example, but the present invention is not limited to this example, and the number of data divisions can be set to an arbitrary number. Is also possible. In addition, the pulse output unit 105
The modulation method of the pulse output section 105d is not limited to BPSK, and the present invention can be applied to PPM, for example. Further, the transmission buffer 103a to the transmission buffer 103
The position of d is not limited to the example of FIG. For example, it may be provided in the subsequent stage of the direct spread processing unit 104a to the direct spread processing unit 104d, or may be configured without using the transmission buffer.

Next, another example of the configuration of transmitting apparatus 1001 shown in FIG. 1 will be described. FIG. 6 is a schematic block diagram showing another configuration example of the transmission device according to the first embodiment of the present invention. The same reference numerals in FIG. 6 and FIG. 1 indicate the same components. As shown in FIG. 6, the transmission data processing unit 101 ′
A part of the transmission data output from the transmission buffer 103
c is directly supplied to the transmission buffer 103d, and the remaining transmission data is divided into two by the data division unit 102 'and is supplied to the transmission buffer 103a and the transmission buffer 103b.

That is, the present invention is not limited to an example in which one transmission data is divided into a plurality of pieces as shown in FIG. 1 and is transmitted. For example, as shown in FIG. May be subjected to data division by a predetermined number of divisions to perform direct spreading processing and modulation impulse output processing, and other portions may be subjected to direct spreading processing and modulation impulse output processing without performing data division. . Since the transmission rate can be increased by increasing the number of data divisions, for example, when transmitting individual data to a plurality of receiving devices, by setting the number of data divisions for each channel, It is also possible to have a required transmission rate.

The transmitting apparatus shown in FIGS. 1 and 6 is
All can be configured with fixed hardware of analog or digital, but at least a part of them is processed according to a program, DSP (digital signal processo)
It is also possible to configure with a processing device such as r). Figure 7
FIG. 7 is a schematic block diagram showing another configuration example of the transmission device shown in FIGS. 1 and 6 including such a processing device. In FIG. 7, the transmission processing unit 110 processes the data Din according to a program written in advance,
The control signal S110 corresponding to the processing result is output, and the impulse generator 111 is caused to generate the transmission signal ST. The impulse generator 111 also outputs an impulse train corresponding to the control signal S110 as the transmission signal ST.

FIG. 8 is a flow chart showing a program example of the transmission processing unit 110 in the transmission device 1003 shown in FIG. Hereinafter, each step of this flowchart will be described. Step ST101: Perform predetermined processing relating to channel coding such as compression processing and error correction code addition processing on the input data Din. Step ST102: Divide the transmission data processed in step ST101 into a plurality of divided data. Note that this step is omitted for transmission data that is not subjected to data division processing as shown in FIG. Step ST103: The divided data sequence generated in step ST102 or the transmission data not subjected to the data division process is directly spread with a predetermined spreading code sequence to generate a plurality of spread data sequences.

Step ST104: A reference impulse train having a predetermined period is modulated according to a plurality of spread data trains, and a modulated impulse train is synthesized by shifting the timing by a predetermined time within one chip period of the spread code sequence. The impulse train is generated by the impulse generator 111 as the transmission signal ST. It is preferable that the modulated impulse sequences corresponding to the spread data sequences directly spread by the spreading code sequences that are not orthogonal to each other are combined at different timings within one chip period. This makes it possible to individually reproduce the original data corresponding to these modulated impulse sequences from the transmission signal ST by utilizing the difference in the timing of impulses.

When the impulse generator 111 has the same structure as the block consisting of the impulse output section and the impulse synthesizer shown in FIGS. 1 and 6, for example, it is included in the control signal 110 of the transmission processing section 110. The transmission signal ST may be generated by combining the modulated impulses modulated according to the spread data sequence in the impulse combining section. Further, in this case, in the case where the pulse output unit controls the generation timing of the impulse as shown in FIG. 2B, the transmission processing unit 110 also generates the control information of the impulse generation timing together with the spread data sequence to generate the modulated impulse. The row timing may be controlled individually.
Further, when the impulse generation unit 111 can control the generation timing and amplitude of each impulse, the transmission processing unit 110 sequentially generates control information on the generation timing and amplitude of each impulse, and the impulse generation unit 11 generates the control information.
Alternatively, the transmission signal ST may be generated by supplying 1 to the transmission signal ST.

<Second Embodiment> Next, a transmitting apparatus according to a second embodiment of the present invention will be described with reference to FIGS. 9 and 10. In the first embodiment, an example in which a plurality of modulated impulse sequences corresponding to individual divided data (or transmission data) are combined to generate a transmission signal has been described. However, in the present embodiment, the same impulse generation timing is used. A plurality of modulated impulse trains output in 1 are generated as one impulse train, and these are combined to generate a transmission signal.

FIG. 9 is a schematic block diagram showing a configuration example of a transmitting apparatus according to the second embodiment of the present invention.
The same reference numerals in FIG. 9 indicate the same components. The direct spreading processing unit 107a, based on the divided data S103a input from the transmission buffer 103a and the divided data S103b input from the transmission buffer 103b, and two spreading code sequences in orthogonal relation to each other corresponding to the respective divided data, The composite diffusion data sequence S107a is generated. That is, the divided data S103a and the divided data S1
03b and a data string uniquely determined from the combination of the respective data values of the two spreading code sequences is generated as a composite spreading data string S107a. Similarly, the direct diffusion processing unit 107b uses the divided data S103c and the divided data S
A composite spread data sequence S107b is generated based on 103d and two spread code sequences that are orthogonal to each other and correspond to the respective divided data.

In the impulse output unit 108a, the reference impulse sequence having a predetermined period is the composite spread data sequence S107a.
Modulated impulse train S108 respectively modulated according to
a is output by shifting the timing by a predetermined time within one cycle of the reference impulse train. For example, BP
When performing modulation by SK, the composite spread data sequence S107
The polarity and amplitude of the generated impulse are changed according to each data value of a. If zero is set as the amplitude of the impulse, the transmission of the impulse may be stopped. Similarly, the impulse output unit 108b determines that the reference impulse sequence having the predetermined period is the composite spread data sequence S107b.
Modulated impulse train S108 respectively modulated according to
b is output by shifting the timing by a predetermined time within one cycle of the reference impulse train.

The impulse synthesizing unit 109 synthesizes the modulated impulse train S108a and the modulated impulse train S108b output from the impulse output unit 108a and the impulse output unit 108b, and sends out as a transmission signal ST from the antenna.

Here, the operation of the transmitting apparatus shown in FIG. 9 will be described. In the waveform example of FIG. 4, each impulse of the combined impulse train generated by combining the modulated impulse train S104a and the modulated impulse train S104b is as shown in FIG.
As shown in, the pulse becomes a positive or negative polarity impulse having twice the amplitude of the original impulse, or the amplitude becomes zero. Which of these impulses will be used is determined by the divided data S103a, the divided data S103b, and the spread code sequence S corresponding to each divided data.
It is uniquely determined from the combination of each data value of D1 and spreading code sequence SD2.

For the sake of explanation, the value "+2" is assigned to the positive impulse having the double amplitude, the value "-2" is assigned to the negative impulse having the double amplitude, and the value "0" is assigned to the impulse having the zero amplitude. Also,
The combination of each data value of the divided data S103a, the divided data S103b, the spreading code series SD1 and the spreading code series SD2 is represented by {S103a, S103b, SD.
1, SD2}. Then, the combination of each data value when the impulse of the value “+2” is generated is {+ 1, + 1, + 1, + 1}, {-1, -1, -1, -1}, { + 1, -1, + 1,-
1} and {-1, + 1, -1, + 1}. Also, the value '
The combination of each data value when the −2 ′ impulse is generated is {+ 1, + 1, -1, -1}, {-1, -1, + 1, +
There are four ways, 1}, {+ 1, -1, -1, + 1} and {-1, + 1, + 1, -1}. The combination of each data value when the impulse of the value '0' is generated is {+ 1, + 1, + 1, -1}, {+ 1, +
1, -1, + 1}, {-1, -1, + 1, -1}, {-1, -1, -1, + 1}, {+1,
-1, + 1, + 1}, {-1, + 1, + 1, + 1}, {+ 1, -1, -1, -1}, {-
There are eight ways: 1, + 1, -1, -1}.

In transmitting apparatus 1004 shown in FIG. 9,
Utilizing the fact that the polarity and amplitude of the transmission impulse are uniquely determined from the combination of the divided data and each data value of the spreading code sequence in this way, a modulated impulse sequence with the same impulse generation timing is shown in FIG. The combined impulse train is directly generated without performing the process of generating and combining the individual modulated impulse trains. For example, the direct diffusion processing unit 107a and the direct diffusion processing unit 10
In 7b, a spread data string corresponding to each combination of data values such as {-2,0,0, + 2, -2,0, -2, ...} is generated, and the data value (value of this spread data string is An impulse having an amplitude and a polarity corresponding to “+2”, value “−2”, or value “0”) is generated in the impulse output unit 108a and the impulse output unit 108b. As a result, the transmission signal ST equivalent to that in FIG. 1 is obtained.

The composite spread data sequence S107a is the spread data S104a and spread data S104 in FIG.
It can be regarded as a combined data string of b and b. Similarly, the composite diffusion data sequence S107b can be regarded as a data sequence in which the diffusion data sequence S104c and the diffusion data sequence S104d are combined.
Therefore, for example, the direct diffusion processing unit 104 in FIG.
a data synthesizing unit for synthesizing two spread data strings is provided in the subsequent stage of a and the direct spread processing unit 104b, and in the subsequent stage of the direct spread processing unit 104c and the direct spread processing unit 104d, and the synthesized data is combined with the composite spread data sequence S10.
7a and the composite spread data sequence S107b are supplied to the impulse output unit 108a and the impulse output unit 108b, respectively, the transmission signal ST equivalent to that in FIG. 1 is obtained.

Next, another configuration example of transmitting apparatus 1004 shown in FIG. 9 will be described. FIG. 10 is a schematic block diagram showing another configuration example of the transmission device according to the second embodiment of the present invention. The same reference numerals in FIGS. 6, 9 and 10 indicate the same components.

In the transmission device 1005 of FIG. 10, part of the transmission data output from the transmission data processing unit 101 'is directly supplied to the transmission buffer 103c and the transmission buffer 103d, and the remaining transmission data is divided into the data division unit. It is divided into two in 102 ′ and supplied to the transmission buffer 103a and the transmission buffer 103b. Also, the transmission buffer 103c and the transmission buffer 103d
From this point, the subsequent block has the same configuration as in Fig. 9,
Three impulse trains (modulation impulse train S108a, modulation impulse train S105c, and modulation impulse train S105d) having different impulse timings are combined in the impulse combiner 109 'to generate the transmission signal ST.

As described above, by combining the configurations of FIG. 6 and FIG. 9, a part of a plurality of transmission data is divided into a predetermined number of divisions to perform direct spreading processing and modulation impulse output processing, and others. For some of the data, direct spreading processing and modulation impulse output processing may be performed without performing data division. For example, when transmitting individual data to a plurality of receiving devices, it is possible to set the required transmission rate for each channel by setting the number of data divisions for each channel as shown in FIG.

The transmitters shown in FIGS. 9 and 10 can all be configured with fixed hardware of analog or digital, but at least a part of them can be formed according to the program as shown in FIG. 7, for example. It is also possible to configure with a processing device such as a DSP for processing. As described above, also in the transmitters shown in FIGS. 9 and 10, the data transmission rate can be four times as high as that of the conventional transmitter that directly spreads one data with one spreading code sequence. Further, in the transmitting apparatus shown in FIGS. 9 and 10, the number of impulse output units can be reduced as compared with the transmitting apparatus shown in FIG. 1, so that the circuit can be simplified and power can be saved. Further, since the transmission from the antenna can be stopped when the amplitude of the impulse becomes zero, it is possible to prevent unnecessary radio wave radiation from the antenna.

In the above description, as in the first embodiment, the case where the transmission data is divided into four has been described as an example, but the present invention is not limited to this example and the data is not limited to this example. It is also possible to set the number of divisions of to any number other than this. Further, the modulation method in the pulse output unit is not limited to BPSK, and for example, PPM
Are also applicable.

<Third Embodiment> Next, a receiving apparatus according to a third embodiment of the present invention will be described with reference to FIGS. 11 to 17. The receiving device described in the third to fifth embodiments receives a signal transmitted by the transmitting device described in the above-described first embodiment or second embodiment, for example. That is, the transmission data is divided into a plurality of pieces, each of the divided data is directly spread by a predetermined spreading code string, and a reference impulse string of a predetermined cycle is modulated according to the spread data string generated by this direct spreading. The impulse train receives a transmission signal that is synthesized by shifting the timing by a predetermined time within one cycle of the reference impulse train.

FIG. 11 is a schematic block diagram showing a configuration example of a receiving apparatus according to the third embodiment of the present invention. In FIG. 11, reference numerals 201a to 201d denote correlation detection units, reference numerals 202a to 202d denote integration units, and reference numeral 2
03a to 203d are data determination units, and 204a
The reference numeral 204d indicates a timing control unit, the reference numeral 207 indicates a data combining unit, and the reference numeral 208 indicates a received data processing unit.

Correlation detector 201a to correlation detector 201d
Holds a predetermined spreading code sequence, and correlates the correlation between an impulse train for correlation detection in which a reference impulse train is modulated in accordance with the spreading code sequence and the received signal SR. Timing control section 204a to timing control Part 20
Detection is performed at a predetermined timing controlled by 4d.
Then, the correlation signals S201a to S201d corresponding to the detection result are output. For example, the result of multiplying the impulse train for correlation detection and the received signal SR by using a multiplier is output as a correlation signal.

The integrators 202a to 202d integrate the input correlation signals S201a to S201d for a predetermined period, and integrate the integrated values S202a to S202d.
Is output to the data determination units 203a to 203d. The integration period is set, for example, according to the length of the spreading code sequence corresponding to 1-bit transmission data.

Data judging section 203a to data judging section 20
3d determines the value (value '+ 1' or value'-1 ') of the divided data according to the integrated value S202a to integrated value S202d in the integrated section 202a to 202d. The determination of the data value may be performed, for example, by converting the input integrated value into a digital value by an A / D conversion circuit and determining whether the digital value is included in a predetermined threshold range. Alternatively, the determination may be made by comparing the input integrated value and a predetermined reference level with a comparator circuit.

The timing control section 204a-timing control section 204d includes the correlation detecting section 201a-correlation detecting section 20.
Control is performed so that the correlation detection timing between the received signal SR and the correlation detection impulse train in 1d is a predetermined timing within one chip period.

The data synthesizing unit 207 is used by the data judging unit 20.
3a to the divided data determined by the data determination unit 203d are combined. For example, the data divided into a plurality of pieces is combined between the most significant bit and the least significant bit.
As a result, the original data before division on the transmitting side is reproduced. The reception data processing unit 208 performs a predetermined decoding process on the data synthesized by the data synthesizing unit according to a process such as channel coding performed on the transmitting side, and reproduces the data Dout.

Now, the operation of the receiving apparatus 2001 of FIG. 11 having the above-mentioned configuration will be described with reference to FIG. 12 showing an example of the signal waveform of each section of the receiving apparatus 2001.
Various noises are superimposed on the reception signal SR as shown in FIG. 12A. In the correlation detection unit 201a, the received signal SR (FIG. 12A) and the correlation detection impulse train SP1 (FIG. 12B) in which the reference impulse train is modulated according to the predetermined spreading code sequence held by the correlation detection unit 201a,
The multiplication is performed at a predetermined timing controlled by the timing control unit 204a. As a result, as shown in FIG. 12C, the correlation signal S201a corresponding to the divided data directly spread by the predetermined spreading code sequence held by the correlation detection unit 201a is obtained from the plurality of divided data combined in the received signal SR. To be detected. In the example of FIG. 12, the correlation signal is a pulse train having a positive or negative polarity. This is because when the impulses of the same polarity are multiplied, the negative side part of the impulse is folded back to the positive side. This is because, when a pulse having a peak on the positive side is generated and multiplied by impulses having different polarities, the positive side portion of the impulse is folded back to the negative side and a pulse having a peak on the negative side is generated.

Similarly, when the received signal SR (FIG. 12A) is multiplied by the correlation detection impulse train SP2 (FIG. 12E) of the correlation detection unit 201b at a predetermined timing controlled by the timing control unit 204b, Received signal SR
From the plurality of divided data combined in the
Correlation signal S201b (FIG. 12F) corresponding to the divided data directly spread by the predetermined spreading code sequence held by 01b.
Is detected. Another correlation signal (S201
The same applies to c, S201d).

By the way, although not shown in the figure, the receiving apparatus described in the embodiment of the present invention captures the correct phase relationship between the spreading code sequence to be multiplied and the spreading data sequence and holds the synchronization state. Processing blocks are included. In the synchronized state held by such processing blocks, the timing control units 204a to 204d further control the correlation detection timings of the correlation detection units 201a to 201d to predetermined timings within one chip period. Thus, the correlation signal as shown in FIG. 12 is detected. Even if the spreading code sequences used for correlation detection are the same, different correlation signals are detected if the correlation detection timing is different. That is, a correlation signal corresponding to a specific combination of the spreading code sequence used for correlation detection and the timing of correlation detection is detected. Therefore, the spreading code sequences of the correlation detection units 201a to 201d and the correlations of the timing control units 204a to 204d are matched so as to match the spreading code sequences of the modulation impulse sequences to be synthesized on the transmission side and the synthesis timing. By appropriately setting the detection timing, the correlation signal S2 corresponding to each divided data combined in the reception signal SR is obtained.
04a-correlation signal S204d can be detected.

Correlation detector 201a to correlation detector 201d
Correlation signal S201a to correlation signal S2 detected in
01d is integrated for a predetermined period in the integration units 202a to 202d. In the example of FIG. 12, the correlation detection impulse train (FIGS. 12B and 12E) is integrated for a period of 16 pulses. This integrated value S202a to integrated value S20
2d is a data determination unit 203a-data determination unit 203d
The value of each divided data (value '+ 1' or value'-1 ') is compared with a predetermined reference in
Is determined.

Data judging section 203a to data judging section 20
The divided data of which the value is determined in 3d is combined by the data combining unit 207 and reproduced as the original data. Then, the received data processing unit 208 decodes and outputs as data Dout.

As described above, the receiving apparatus 200 shown in FIG.
According to 1, the transmission data is divided into a plurality of pieces, the divided data is directly spread by a predetermined spreading code string, and the reference impulse train of a predetermined cycle is respectively generated according to the spread data string generated by the direct spreading. The original data can be reproduced by receiving the transmission signal generated by synthesizing the modulated modulated impulse train by shifting the timing by a predetermined time within one cycle of the reference impulse train. Therefore, the data divided into a plurality of pieces can be received at a time, so that the data transmission rate can be increased as compared with the conventional receiving apparatus which receives a signal in which one data is directly spread by one spreading code sequence. can do.

Although the description has been given with reference to FIG. 11 as an example of a receiving device for data divided into four, the present invention is not limited to this example. That is, it is possible to receive data divided by an arbitrary number of divisions. Also,
The data determined by the data determination unit need not necessarily be combined. For example, when the transmission device shown in FIG. 6 or FIG. 10 receives a signal in which transmission data that is not divided data is combined, the data determined by the data determination unit may be directly processed as reception data.
Further, the impulse modulation method is not limited to BPSK, and may be PPM, for example.

Next, another configuration example of the above-mentioned receiving device 2001 will be described. FIG. 13 is a schematic block diagram showing another configuration example of the receiving device according to the third embodiment of the present invention. In the receiving apparatus 2002 shown in FIG. 13, the correlation detecting unit 201a to the correlation detecting unit 2 in FIG.
Instead of 01d, impulse correlation detector 2011a,
An impulse correlation detecting unit 2011b and spreading code multiplying units 2012a to 2012d are provided.

The impulse correlation detecting section 2011a and the impulse correlation detecting section 2011b detect the correlation between a predetermined reference impulse train and the received signal SR at correlation detection timings corresponding to the timing control section 204a and the timing control section 204c, respectively. , And generates an impulse correlation signal S2011a and an impulse correlation signal S2011b according to the detection result. For example, when the transmission signal is modulated by BPSK, the reference impulse train is an impulse train having a predetermined polarity (positive or negative) and a predetermined period. Further, for example, when the transmission signal is modulated by PPM, the reference impulse train is an impulse train having a predetermined cycle with a certain time difference. By detecting the correlation between the reference impulse train and the received signal SR, the impulse component of a predetermined cycle included in the received signal SR is extracted as the impulse correlation signal S2011a and the impulse correlation signal S2011b.

The spreading code multiplying unit 2012a and the spreading code multiplying unit 2012b each hold a predetermined spreading code sequence, and invert the polarity of the impulse correlation signal S2011a according to each data value of this spreading code sequence, Correlation signal S2012a and correlation signal S2012
produces b. Similarly, the spreading code multiplying unit 2012c and the spreading code multiplying unit 2012d each hold a predetermined spreading code sequence, and the impulse correlation signal S2.
The polarity of 011b is inverted according to each data value of this spreading code sequence to generate a correlation signal S2012c and a correlation signal S2012d.

Now, the operation of receiving apparatus 2002 of FIG. 13 having the above configuration will be described with reference to FIG. 14 showing the signal waveform of each section of receiving apparatus 2002. The received signal SR (FIG. 14A) on which the noise is superimposed is multiplied by the reference impulse sequence in the impulse correlation detection unit 2011a, so that the impulse component included in the received signal SR is extracted as the impulse correlation signal S2011a (FIG. 14B). It The polarity of the impulse correlation signal S2011a has a positive polarity when the impulse component included in the reception signal SR and the reference impulse have the same polarity, and has a negative polarity when the polarities are different.

The polarity of the impulse correlation signal S2011a is inverted according to each data value of the spreading code sequence held in the spreading code multiplication unit 2012a to generate the correlation signal S2012a (FIG. 14C), and the spreading code multiplication is performed. Correlation signal S2012b (FIG. 14E) is generated by being inverted according to each data value of the spreading code sequence held in unit 2012b. The integrated value S202a (FIG. 14D) and the integrated value S2 having positive or negative polarities are obtained by integrating the correlation signal S2012a and the correlation signal S2012b respectively for a predetermined period.
02b (FIG. 14F) is obtained.

By the way, the reference impulse train and the received signal S
Inverting the polarity of the correlation signal according to the spreading code sequence after detecting the correlation with R is to detect the correlation between the reference impulse sequence modulated according to the spreading code sequence and the received signal SR. Is equivalent to Therefore, when the spreading code sequences of the correlation detecting unit 201a and the spreading code multiplying unit 2012a are the same, the correlation signal S2012a and the correlation signal S201a are equivalent signals. Further, when the timing control unit 204a and the timing control unit 204b have the same correlation detection timing and the correlation detection unit 201b and the spreading code multiplication unit 2012b have the same spreading code sequence, the correlation signal S2012b and the correlation signal S201b are equivalent signals.

Similarly, the correlation detection timings of the timing control unit 204c and the timing control unit 204d are equal,
When the spreading code sequences of the correlation detecting unit 201c and the spreading code multiplying unit 2012c and the spreading code sequences of the correlation detecting unit 201d and the spreading code multiplying unit 2012d are equal, respectively, the correlation signal S2012c and the correlation signal S201c, and the correlation signal S2012d and the correlation signal S201d is an equivalent signal.

Therefore, the receiving apparatus 200 shown in FIG.
Also in No. 2, since the original data before division can be reproduced from the reception signal SR as in the reception device 2001 shown in FIG. 11, the same effect as described above can be obtained. Further, the receiving apparatus 2001 shown in FIG. 11 requires a correlation detection unit for each piece of divided data to be reproduced, but the receiving apparatus 2002 shown in FIG. 13 is common when reproducing divided data having the same correlation detection timing. An impulse correlation detector can be used. Therefore, the number of blocks for detecting the correlation between the impulse train and the received signal can be reduced, and the device configuration can be simplified.

The receiving apparatus shown in FIGS. 11 and 13 can be constructed by fixed hardware of analog or digital, but a processing apparatus such as DSP for processing at least a part of the hardware according to a program. It is also possible to configure with. FIG. 15 is a schematic block diagram showing another configuration example of the receiving device shown in FIGS. 11 and 13 including such a processing device. In FIG.
Reference numeral 215 indicates a correlation detection unit, and reference numeral 216 indicates a reception processing unit.

Correlation detecting section 215 is a block for detecting the correlation between the correlation detection impulse train obtained by modulating the reference impulse train with a predetermined spreading code sequence and the received signal SR by shifting the timing by a predetermined time. For example, in FIG.
In, it corresponds to a block composed of the correlation detection unit 201a to the correlation detection unit 201d. Further, in FIG. 13, impulse correlation detection section 2011a, impulse correlation detection section 2011b, and spreading code multiplication section 2012a-
This corresponds to the block configured by the spreading code multiplication unit 2012d.

The reception processing unit 216 controls the correlation detection timing in the correlation detection unit 215 based on the program written in advance, and also the correlation detection unit 21.
The correlation signal detected in 5 is converted into a digital value by an A / D conversion circuit or the like and processed to reproduce the data Dout.

FIG. 17 is a flow chart showing an example of a program in the reception processing section shown in FIG. Hereinafter, each step of this flowchart will be described. Step ST201: The correlation detection unit 215 detects the correlation between the correlation detection impulse train and the received signal SR by shifting the timing by a predetermined time. And
This detection result is converted into a digital value and input as a correlation signal. Step ST202: The inputted correlation signal is integrated for a predetermined period. For example, the correlation signal corresponding to one bit of data is integrated. Step ST203: Determine the data value of the divided data according to the integrated value of the correlation signal in step ST202. For example, the data value is determined according to the result of comparison between a predetermined threshold value and the integrated value.

Step ST204: Step ST203
The original data is reproduced by synthesizing the divided data determined in. Step ST205: The data reproduced in step ST204 is subjected to a predetermined decoding process according to a process such as channel coding performed on the transmitting side, and the data Do
play ut.

Since the frequency of the correlation signal is high, A /
When accurate digital conversion cannot be performed by the D conversion circuit, for example, as shown in FIG.
The correlation signal of No. 5 may be integrated by the integration unit 217 for a predetermined period, and then the integrated value may be converted into a digital value and processed by the reception processing unit 216. In this case, step S
At T202, the detection result of the correlation detection unit 215 is integrated by the integration unit 217 for a predetermined period, and the integrated value is input to the reception processing unit 216 as a digital value.

Further, it is not always necessary to combine all the data determined in step ST203 in step ST204. For example, in the case where the transmitting device shown in FIG. 6 or FIG.
The data determined in step ST204 may be directly decoded in step ST205 without being combined in step ST204.

<Fourth Embodiment> Next, a receiving apparatus according to a fourth embodiment of the present invention will be described with reference to FIGS. In the present embodiment, an example of a receiving apparatus will be described in which a correlation signal for a signal component having an amplitude of zero is removed from the detected correlation signals to reduce a data reception error due to noise.

FIG. 18 is a schematic block diagram showing a configuration example of a receiving apparatus according to the fourth embodiment of the present invention, and the same symbols in FIG. 18 and FIG. 11 indicate the same components. In FIG. 18, reference numerals 209a to 209h denote extraction units, reference numerals 210a to 210h denote integration units, reference numerals 211a to 211d denote comparison units, and reference numerals 212a to 212d denote data determination units.

The received signal SR has four modulation impulses generated corresponding to the data divided into four, which are 2
It is assumed that they are combined at the same timing.
Since this signal is received, the correlation detection timing of the timing control unit 204a and the timing control unit 204b, and the timing control unit 204c and the timing control unit 204.
It is assumed that the correlation detection timings of d are the same and the two correlation detection timings are deviated from each other by a predetermined time.

The extraction section 209a and the extraction section 209b are
Correlation signal S20 detected by the correlation detection unit 201a
From 1a, a signal corresponding to a specific bit of the spread code string is extracted for each combination of data values of two pieces of divided data that are combined at the same timing on the transmission side. For example, the extraction unit 209a corresponds to a combination in which the values of two pieces of divided data are equal to each other, and the extraction unit 209b corresponds to a combination in which the values of two pieces of divided data are different from each other. Then, the extraction unit 209a and the spreading code sequence SDa held in the correlation detection unit 201a and the correlation detection unit 201b.
The extraction unit 209b extracts the correlation signal detected in a specific bit where the code values of the spread code sequence SDb held in the same are mutually different, and the extraction unit 209b has different code values of the spread code sequence SDa and the spread code sequence SDb. Extract the correlation signal detected at a particular bit.

Similarly, the extraction unit 209c and the extraction unit 20
9d extracts from the correlation signal S201b detected by the correlation detection unit 201b, a signal corresponding to a specific bit of the spread code string for each combination of the data values of the two pieces of divided data combined at the same timing on the transmission side. To do. For example, the extraction unit 209c uses the spreading code sequence SDa.
And a specific bit for which the code values of the spread code sequence SDb are equal to each other, the extraction unit 209b determines the spread code sequence S
Correlation signals detected at specific bits where the code values of Da and the spread code sequence SDb are different from each other are extracted.

Further, the extraction unit 209e and the extraction unit 209
The signal f is extracted from the correlation signal S201c detected by the correlation detection unit 201c, for each combination of the data values of the two pieces of divided data combined at the same timing on the transmission side, a signal corresponding to a specific bit of the spread code string. To do. For example, the extraction unit 209e corresponds to a combination in which the values of two pieces of divided data are equal to each other, and the extraction unit 209f corresponds to a combination in which the values of two pieces of divided data are different from each other. Then, the extraction unit 209e includes the correlation detection unit 20.
Spreading code sequence SDc held in 1c and correlation detector 2
The spreading code sequence SDd held in 01d extracts the correlation signal detected at a specific bit where each code value is equal to each other, and the extraction unit 209f determines the spreading code sequence S
A correlation signal detected at a specific bit where the code values of Dc and the spread code sequence SDd are different from each other is extracted.

Similarly, the extraction unit 209g and the extraction unit 20
9h extracts from the correlation signal S201d detected by the correlation detection unit 201d, a signal corresponding to a specific bit of the spread code string for each combination of the data values of the two pieces of divided data combined at the same timing on the transmission side. To do. For example, the extraction unit 209g uses the spreading code sequence SDc.
And a specific bit where the code values of the spread code sequence SDd are equal to each other, the extraction unit 209h determines that the spread code sequence S
Correlation signals detected in specific bits where the code values of Dc and the spread code sequence SDd are different from each other are extracted.

The integrating sections 210a to 210h integrate the signals extracted by the extracting sections 209a to 209h for a predetermined period.

The comparing section 211a compares the integrated values of the integrating section 210a and the integrating section 210b with each other, and outputs the integrated value selected according to the comparison result. For example, the absolute values of the integrated values are compared, and the integrated value with the larger absolute value is output. As a result of comparing the integrated values, if there is almost no difference in the integrated values due to the interference component being superposed, or if a state in which the integrated values have opposite polarities and become equivalent to each other is detected, these values are detected. Instead of selecting either one in the comparison unit, for example, the result of addition of both integrated values may be output to the data determination unit in the subsequent stage.

Similarly, the comparison unit 211b is configured to integrate the integration unit 210
c and the integral values of the integrator 210d are compared with each other, and the integral value selected according to the comparison result is output. Comparison unit 2
11c compares the integrated values of the integrating section 210e and the integrating section 210f with each other, and outputs the integrated value selected according to the comparison result. The comparison unit 211d compares the integration values of the integration unit 210g and the integration unit 210h with each other, and outputs the integration value selected according to the comparison result.

Data judging section 212a to data judging section 21
2d determines the value of the divided data according to the integrated value output from the comparison units 212a to 212d. The determination of the data value may be performed, for example, by converting the input integrated value into a digital value by an A / D conversion circuit and determining whether the digital value is included in a predetermined threshold range. Alternatively, the determination may be made by comparing the input integrated value and a predetermined reference level with a comparator circuit.

Now, the operation of receiving apparatus 2004 of FIG. 18 having the above-mentioned configuration will be described by taking the case where the signal shown in FIG. 3 is received as an example. In FIGS. 3A to 3C and FIGS. 3E to 3G, the high level signal is set to the value “+1”,
Assuming that the low level signal has a value of “−1”, the spreading code sequence SDa in the example of FIG. 3B is {+ 1, -1, -1, + 1, + 1, -1, + 1, + 1,-. 1, -1, -1, + 1, -1, + 1, + 1, -1} ... (1a) is a data string having a data length of 16 and a value of “+1” is obtained by this spreading code sequence SDa. When the data is spread directly, {+ 1, -1, -1, + 1, + 1, -1, + 1, + 1, -1, -1, -1, + 1, -1, + 1 , + 1, -1} ... (2a) is generated. Further, when the data of the value'-1 'is directly spread by the same spreading code sequence SDa, {-1, + 1, + 1, -1, -1, + 1, -1, -1, + 1, A diffusion data string of + 1, + 1, -1, + 1, -1, -1, + 1} (3a) is generated.

In the example of FIG. 3F, the spreading code sequence SDb is {+ 1, -1, -1, + 1, -1, + 1, + 1, + 1, -1, -1, + 1, -1, -1, + 1, + 1, -1} ... (1b) is a data string having a data length of 16 and when the data of value '+ 1' is directly spread by this spreading code sequence SDb, {+ 1, -1, -1, + 1, -1, + 1, + 1, + 1, -1, -1, + 1, -1, -1, + 1, + 1, -1} ・.. (2b) The spread data string is generated. Further, when the data of the value '-1' is directly spread by the same spreading code sequence SDb, {-1, + 1, + 1, -1, + 1, -1, -1, -1, + 1, A diffusion data string of + 1, -1, + 1, + 1, -1, -1, + 1} ... (3b) is generated.

When the data of value "+1" is spread by the spreading code series SDa and the data of value "+1" is directly spread by the spreading code series SDb and synthesized, the data string (2a) and the data string (2b) are combined. From the synthesis result, {+ 2, -2, -2, + 2, 0, 0, + 2, + 2, -2, -2, 0, 0, -2, + 2, + 2, -2} ・.. (4a) It can be seen that the impulse train is generated. Also,
When the data of value "-1" is spread by the spreading code series SDa and the data of value "-1" is directly spread by the spreading code series SDb and synthesized, the data sequence (3a) and the data sequence (3b) are synthesized. Therefore, {-2, + 2, + 2, -2, 0, 0, -2, -2, + 2, + 2, 0, 0, + 2, -2, -2, + 2} ... An impulse train of (4b) is generated. Spreading code series SD
Data having a value of “+1” depending on a is spread code sequence SDb.
When the data of the value “−1” is directly diffused and combined by, the data string (2a) and the data string (3b)
By combining {0, 0, 0, 0, + 2, -2, 0, 0, 0, 0, -2, + 2, 0, 0, 0, 0} (4c) Is generated. Spreading code series SD
The data having the value “−1” according to a is the spreading code sequence SDb.
When the data of the value “+1” is directly diffused and combined by, the data string (3a) and the data string (2b)
By combining {0, 0, 0, 0, -2, + 2, 0, 0, 0, 0, + 2, -2, 0, 0, 0, 0} (4d) impulse train Is generated.

Comparing these impulse trains, it can be seen that the impulse train (4a) and the impulse train (4b) have the same bit at which the amplitude becomes zero. That is,
When the values of the two pieces of divided data combined on the transmission side are equal to each other, the bits at which the amplitude of the transmission impulse train becomes zero are equal. Also, the impulse train (4c) and the impulse train (4d) have the same bit at which the amplitude becomes zero. That is, even when the values of the two pieces of divided data that are combined on the transmission side are different from each other, the bits at which the amplitude of the transmission impulse train becomes zero are the same. Furthermore, the impulse train (4
a) and impulse train (4b) have zero amplitude, the impulse train (4c) and impulse train (4)
In d) the amplitude is non-zero (value '+ 2' or value'-
It can be seen that the bit is equal to 2 ').

Now, in the extraction unit 209a of FIG. 18, for example, the correlation signal at a specific bit whose amplitude is other than zero in the impulse train (4a) and the impulse train (4b) is extracted, and this is integrated by the integrator 210a. To be done. Further, in the extraction unit 209b, for example, the correlation signal at a specific bit whose amplitude is other than zero is extracted in the impulse train (4c) and the impulse train (4d),
This is integrated by the integrator 210b. When the data of the same value is combined on the transmission side, the correlation signal of the impulse code other than zero amplitude and the spread code is extracted and input to the integration unit 210a, so that the integration value S210a becomes a relatively large value. On the other hand, since the correlation signal between the received signal of zero amplitude and the spread code is extracted and input to the integrator 210b, the integrated value S210b becomes a minute value.
Conversely, when data of different values are combined on the transmission side, the integrated value S210a of the integrating section 210a becomes a minute value and the integrated value S210b of the integrating section 210b becomes a relatively large value. In this way, the integrated value S210a and the integrated value S2 are
The magnitude relationship of the absolute values of 10b corresponds to the combination of the data values combined on the transmitting side (whether the values are the same or different).

The two integrated values are compared in the comparison section 211a. Then, the integrated value having the larger absolute value is output to the data determination unit 212a, and the data value of the divided data is determined from the polarity. Therefore,
The integrated value of the correlation signal when the amplitude of the received signal SR becomes zero is excluded from the determination target of the data value in the data determination unit 212a.

The above operation reproduces the other divided data combined at the same timing, and the correlation detecting unit 201
The same applies to a block including b, the timing control unit 204b, the extraction unit 209c, the extraction unit 209d, the integration unit 210c, the integration unit 210d, the comparison unit 211b, and the data determination unit 212b.

Further, the correlation detecting unit 201c and the correlation detecting unit 2
01d, timing control unit 204c, timing control unit 204d, extraction unit 209e to extraction unit 209h, integration unit 2
10e to integrating section 210h, comparing section 211c, comparing section 21
1d, data determination unit 212c and data determination unit 212
In the block consisting of d, the only difference is that two pieces of divided data combined at different timings from the above-mentioned two pieces of divided data are reproduced, and these divided data are also reproduced by the same operation as described above. .

Data judging section 212a to data judging section 21
The divided data of which the value is determined in 2d is combined by the data combining unit 207, decoded by the received data processing unit 209, and output as data Dout.

As described above, also in the receiving apparatus shown in FIG. 18, since the original data before division can be reproduced from the received signal similarly to the receiving apparatus shown in FIG. 11, the same effect as the receiving apparatus shown in FIG. 11 can be obtained. be able to. Further, in the receiving apparatus shown in FIG. 18, since the integrated value of the correlation signal when the amplitude of the received signal becomes zero can be excluded from the determination target of the data value, the determination result is not affected by the unnecessary noise component, The data error rate can be reduced.

In the above embodiment, the receiving device for receiving a signal obtained by combining two pieces of four divided data at two kinds of timings has been described as an example, but the present invention is limited to this example. It is not something that will be done. That is, the total number of divisions of the original data and the number of division data to be combined at the same timing are arbitrary. Further, the impulse modulation method is not limited to BPSK, and for example, P
You can use PM.

Next, another configuration example of the receiving apparatus 2004 shown in FIG. 18 will be described. FIG. 19 is a schematic block diagram showing another configuration example of the receiving device according to the fourth exemplary embodiment of the present invention. In the receiving device 2005 shown in FIG. 19, as in the receiving device 2002 shown in FIG.
8 in place of the correlation detection units 201a to 201d, an impulse correlation detection unit 2011a, an impulse correlation detection unit 2011b, and a spreading code multiplication unit 201.
2a to spreading code multiplication unit 2012d are provided.

Therefore, the correlation signal S2012 of FIG.
a-correlation signal S2012d is the correlation signal S201 of FIG.
It becomes a signal equivalent to each of a to correlation signal 201d. That is, also in the receiving device 2005 shown in FIG. 19, the original data before division can be reproduced from the received signal SR similarly to the receiving device 2004 shown in FIG. 18, so that the same effect as described above can be obtained. Further, the receiving device 2 shown in FIG.
In 004, the correlation detection unit is required for each divided data to be reproduced, while the receiving device 2005 shown in FIG.
Then, a common impulse correlation detection unit can be used when reproducing divided data having the same correlation detection timing. Therefore, the number of blocks for detecting the correlation between the impulse train and the received signal can be reduced, and the device configuration can be simplified.

The receiving apparatus shown in FIGS. 18 and 19 can be constructed by fixed hardware of analog or digital, but a processing apparatus such as DSP for processing at least a part of the hardware according to a program. It is also possible to configure with. FIG. 20 is a schematic block diagram showing another configuration example of the receiving device shown in FIGS. 18 and 19 including such a processing device. 15 and 1
6, the same reference numerals in FIG. 20 indicate the same components, and
In FIG. 20A, reference numeral 218 indicates an extraction unit.

The extraction unit 218 is, for example, shown in FIGS.
As in the block composed of the extraction unit 209a to the extraction unit 209h in FIG. 9, the spread code sequence is set for each combination of the data values of the divided data synthesized at the same timing on the transmission side from the correlation signal detected by the correlation detection unit 215. The signal corresponding to a particular bit of is extracted.

The division of blocks for processing analog signals and blocks for processing digital signals is arbitrary,
For example, as shown in FIG. 15, the configuration may be such that the output signal of the correlation detection unit is digitally converted and processed, or as shown in FIG. 20A, the signal extracted by the extraction unit 218 may be digitally converted and processed. . Alternatively, FIG.
As shown in FIG. 5, the integration result of the integration unit 217 of the signal extracted by the extraction unit 218 may be digitized and processed.

FIG. 21 is a flow chart showing an example of the program in the reception processing unit 216. Hereinafter, each step of this flowchart will be described. Step ST211: In the correlation detection unit 215, the correlation between the impulse train for correlation detection and the received signal SR is detected by shifting the timing by a predetermined time. In the case of the configuration shown in the example of FIG. 15, the correlation detection result is converted into a digital value and input to the reception processing unit 216.

Step ST212: A signal corresponding to a specific bit of the spread code string is extracted from the correlation signal detected by the correlation detection unit 215 for each combination of the data values of the divided data combined at the same timing on the transmission side. To do. In the case of the configuration shown in the example of FIG. 20A, the signal extracted by the extraction unit 218 in this step is converted into a digital value and input to the reception processing unit 216. Step ST213: The signal extracted in step ST212 is integrated for a predetermined period. For example, the correlation signal corresponding to one bit of data is integrated. In the case of the configuration shown in the example of FIG. 20B, the integration value integrated by the integration unit 217 in this step is converted into a digital value, and the reception processing unit 21.
Enter in 6.

Step ST214: The integrated values of the signals extracted from the same correlation signal are compared with each other, and one integrated value is selected for each correlation signal according to the comparison result. Step ST215: The value of the divided data is determined according to the integrated value selected in step ST214. For example, the integrated value is compared with a predetermined threshold value, and the value of the divided data is determined according to the comparison result.

Step ST216: Step ST215
The divided data determined in (3) is combined to reproduce the original data before the division. Step ST217: The data reproduced in step ST216 is subjected to a predetermined decoding process according to the process such as the channel coding performed on the transmission side to obtain the data Do.
play ut.

The data determined in step ST215 do not necessarily have to be combined in step ST216. For example, when the transmission device shown in FIG. 6 or FIG. 10 receives a signal obtained by combining transmission data that is not divided data, step ST215.
The data determined in step ST216 may be directly decoded in step ST217 without being combined in step ST216.

<Fifth Embodiment> Next, a receiving apparatus according to a fifth embodiment of the present invention will be described with reference to FIGS. In the receiving device described in the present embodiment, the configurations of the receiving devices in the above-described third and fourth embodiments are further simplified.

FIG. 22 is a schematic block diagram showing a configuration example of a receiving apparatus according to the fifth embodiment of the present invention, and the same reference numerals in FIG. 11 and FIG. 22 show the same constituent elements. Further, in FIG. 11, reference numerals 213a to 213d denote correlation detection units, reference numerals 214a to 214d denote integration units, and
Reference numerals 215 and 215b denote data determination units, respectively.

In the reception signal SR, as in the description of the fourth embodiment, the data divided into four forms a pair of two pieces of divided data, and the modulation impulse corresponding to this pair of divided data. It is assumed that pairs are combined at a common timing for each pair. Since this signal is received, the correlation detection timing of the timing control unit 204a and the timing control unit 204b and the correlation detection timing of the timing control unit 204c and the timing control unit 204d are equal to each other, and the two correlation detection timings are mutually predetermined times. It is assumed that they are deviated from each other.

The correlation detecting unit 213a has two units which are orthogonal to each other.
The correlation between the modulated impulse train obtained by modulating the reference impulse train according to the combined data train obtained by directly spreading the data of the same value by one spreading code train and the received signal SR is determined by the timing. The detection is performed at a predetermined timing within one chip period controlled by the control unit 204a. For example, on the transmitting side, the spreading code sequence (1
When a) and the spreading code sequence (1b) are used for direct spreading, the correlation between the impulse train (4a) or the impulse train (4b) and the received signal SR is detected at a predetermined timing. In this way, the correlation detection impulse sequence SP3 in the correlation detection unit 213a is generated by combining two modulated impulse sequences generated by directly spreading data of the same value with two spreading code sequences orthogonal to each other. Equal to the impulse train being performed.

The correlation detecting unit 213a may select a correlation signal between the impulse corresponding to the data of the specific bit of the spread code sequence and the received impulse and output it to the integrating unit 214a. For example, the correlation signal at a bit where the amplitude of the impulse train SP3 is other than zero may be selected and output to the integrating unit 214a.

The correlation detecting unit 213c also has a function of detecting the correlation detecting unit 213.
a modulated impulse train which is the same as a and which modulates a reference impulse train according to a combined data train obtained by combining two data trains obtained by directly spreading data of the same value with two spreading code trains orthogonal to each other. The correlation with the reception signal SR is controlled by the timing control unit 204c.
It is detected at a predetermined timing within the chip cycle.

The correlation detecting section 213b has two mutually orthogonal positions.
The correlation between the modulated impulse train obtained by modulating the reference impulse train in accordance with the combined data train obtained by combining two data trains obtained when data of different values are directly spread by one spreading code train and the reception signal SR is determined by the timing. Control unit 204b
It is detected at a predetermined timing within the one-chip period controlled by. For example, when the spreading code sequence (1a) and the spreading code sequence (1b) are used for direct spreading on the transmission side, the impulse train (4c) or the impulse train (4d) is used as the impulse train SP4. In this way, the impulse sequence SP4 for correlation detection in the correlation detection unit 213b is generated by directly spreading data of different values by two spreading code sequences orthogonal to each other 2
It is equal to the impulse train generated by combining two modulated impulse trains.

Further, the correlation detecting section 213b may select a correlation signal between the impulse corresponding to the data of the specific bit of the spread code sequence and the received impulse and output it to the integrating section 214a. For example, the correlation signal at the bit where the amplitude of the impulse train SP3 is other than zero may be selected and output to the integrating unit 214b.

The correlation detecting unit 213d is also the correlation detecting unit 213.
and a modulated impulse train in which the reference impulse train is modulated according to a combined data train obtained by combining two data trains obtained when two data sequences having different values are directly spread by two spreading code trains orthogonal to each other. The correlation with the received signal SR is detected at a predetermined timing within one chip period controlled by the timing control unit 204d.

The integrating units 214a to 214d integrate the correlation signals detected by the correlation detecting units 213a to 213d for a predetermined period, respectively.

The data determination section 215a determines the integrated value S214.
The values of the two pieces of divided data that are combined at the same timing are respectively determined according to the result of comparison between a and the integrated value S214b and the polarity of the integrated value selected according to this comparison result. For example, it is determined which of the integrated value S214a and the integrated value S214b has a larger absolute value, and the received signal is a combination of divided data having the same value or a combination of divided data having different values. Is determined. Further, the polarity of the integrated value having the larger absolute value is determined, and thereby the respective values of the two pieces of combined divided data are determined.

The data value is judged by converting the input integrated value into a digital value by an A / D conversion circuit,
It may be determined depending on whether or not the digital value is included in a predetermined threshold range. Alternatively, the determination may be made by comparing the input integrated value and a predetermined reference level with a comparator circuit.

The operation of receiving apparatus 2007 of FIG. 22 having the above configuration will be described with reference to FIG. FIG. 23 is a diagram showing an example of signal waveforms of respective parts of the receiving device 2007 shown in FIG. As mentioned above, 2
In an impulse train obtained by directly spreading two pieces of divided data and synthesizing the same, when the two data values synthesized on the transmitting side are the same, the bits at which the amplitude of the transmission impulse train becomes zero become equal. Further, there are two combinations in which two data values are the same, each data being a value “+1” or a value “−1”, and the transmission impulse train by these two combinations is the data train (4a). And the data string (4b) are compared, the polarities of the bits are mutually inverted. Further, even when two data values synthesized on the transmission side are different from each other, the bits at which the amplitude of the transmission impulse train becomes zero are equal, and the transmission impulse train by the combination of two types of data values is The polarities are opposite to each other.

This embodiment utilizes such a relationship. First, a combination of two combined data is determined according to the integral value of the transmission impulse train, and then each combination is determined according to the polarity of the transmission impulse train. Determine the value of the data.

Predetermined impulse train SP generated when data of the same value are combined at the same timing on the transmission side
3 (FIG. 23B) and the received signal SR (FIG. 23A) are detected by the correlation processing unit 213a. Further, a predetermined impulse train SP4 (FIG. 23) generated when data of different values are combined at the same timing on the transmission side.
The correlation between E) and the received signal SR (FIG. 23A) is detected by the correlation processing unit 213b. Correlation signals (FIGS. 23C and 23F) corresponding to these correlation results are integrated in the integration unit 214a and the integration unit 214b.

The integrated values in the integrator 214a and the integrator 214b are compared in absolute value by the data determiner 215a, and whether the two data values synthesized at the same timing are the same or different is determined by the result of this comparison. To be judged. Further, the data determination unit 215a detects the polarity of the integrated value determined to have a large absolute value, and thereby the polarity of the transmitted impulse train. As described above, the combination of the data values combined on the transmitting side (whether the combined data values are the same or different) and the polarity of the impulse sequence transmitted in the combination are determined. Each value of is determined. That is, the values of the two pieces of divided data that are combined at the same timing are determined on the transmission side.

Correlation detector 213c and correlation detector 213
d, timing control unit 204c, timing control unit 20
4d, the integrating unit 214c, the integrating unit 214d, and the data determining unit 215b, the correlation detection timing is different from that of the timing control unit 204a and the timing control unit 204b. The value is determined.

As described above, also in the receiving apparatus 2007 shown in FIG. 22, the receiving apparatus 2001 shown in FIG.
Since the original data before division can be reproduced from the received signal in the same manner as, the same effect as the receiving apparatus 2001 shown in FIG. 11 can be obtained. Further, the receiving device 200 shown in FIG.
In FIG. 7, since the data determination unit provided for each divided data in the receiving device 2001 in FIG. 11 can be made common to the divided data combined at the same timing, the device configuration can be simplified.

Further, the correlation detector 213a to the correlation detector 2
In 13d, it is possible to select the correlation signal corresponding to the bit whose amplitude of the transmission impulse train is other than zero and integrate it in the integrating unit in the subsequent stage, and to eliminate the integration of the correlation signal corresponding to the bit whose amplitude is zero. . As a result, unnecessary noise components are not integrated in the integrator, so that the influence of noise on the determination result of the data value is reduced and the error rate of the received data can be reduced.

Next, another configuration example of the receiving apparatus according to the fifth embodiment of the present invention will be described with reference to the block diagram of FIG. In the receiving apparatus shown in FIG. 24, the correlation detecting unit 213a to the correlation detecting unit 213d in FIG.
Instead of the impulse correlation detector 2131a, the impulse correlation detector 2131b, and the spreading code multiplier 2
132a to a spreading code multiplication unit 2132d are provided.

Impulse correlation detecting section 2131a and impulse correlation detecting section 2131b detect the correlation between a predetermined reference impulse sequence and received signal SR at correlation detection timings corresponding to timing control section 204a and timing control section 204c, respectively. , And generates an impulse correlation signal S2131a and an impulse correlation signal S2131b according to the detection result.

The spread code multiplication unit 2132a holds a combined data string obtained by combining two data strings obtained by directly spreading data of the same value with two spreading code strings orthogonal to each other, and the impulse correlation signal S2131a
The polarity of is inverted according to each data value of this combined data sequence to generate a correlation signal S2132a. Similarly, the spreading code multiplication unit 2132c holds a combined data string obtained by combining two data strings obtained when the data of the same value is directly spread by two spreading code strings orthogonal to each other, and the impulse correlation signal The polarity of S2131b is inverted according to each data value of this composite data string, and the correlation signal S
2132c is generated.

The spread code multiplication unit 2132b holds a combined data string obtained by combining two data strings obtained when two data values having different values are directly spread by two spreading code strings orthogonal to each other, and the impulse correlation signal S2131
The polarity of a is inverted according to each data value of this combined data sequence to generate a correlation signal S2132b. Similarly, the spreading code multiplication unit 2132d holds a combined data string obtained by combining two data strings obtained when two data sets having different values are directly spread by two spreading code strings that are orthogonal to each other. The polarity of S2131b is inverted according to each data value of this combined data sequence, and the correlation signal S2132d is generated.

After detecting the correlation between the reference impulse train and the received signal SR, inverting the polarity of the correlation signal in accordance with the composite data train is to receive the reference impulse train modulated in accordance with this composite data train and the reception signal. Since it is equivalent to detecting the correlation with the signal SR, the receiving device 2 shown in FIG.
Also in 008, the original data before division can be reproduced from the received signal SR, as in the receiving device 2007 shown in FIG.
Therefore, the same effect as that described above can be obtained.
Further, in the receiving apparatus 2007 shown in FIG. 22, a correlation detecting unit is required for each divided data to be reproduced,
The receiving apparatus 2008 shown in FIG. 23 can use a common impulse correlation detection unit when reproducing divided data having the same correlation detection timing. Therefore, the number of blocks for detecting the correlation between the impulse train and the received signal can be reduced, and the device configuration can be simplified.

The receiving apparatus shown in FIGS. 22 and 24 can be entirely configured with fixed analog or digital hardware, but a processing apparatus such as a DSP for processing at least a part of the hardware according to a program. It is also possible to configure with.

<Sixth Embodiment> Next, a communication system according to a sixth embodiment of the present invention will be described with reference to FIGS.
Will be described with reference to. FIG. 25 is a schematic block diagram showing a configuration example of a communication system according to the sixth exemplary embodiment of the present invention. In FIG. 25, reference numerals 3001 to 300
Reference numeral 4 denotes a communication device.

The communication device 3001 includes the transmitting device according to the above-described first embodiment or second embodiment. The data to be transmitted to the communication device 3002 is divided into two, and the divided data is directly spread by the spreading code series "A" and the spreading code series "B" to obtain the timing "
The data to be transmitted to the communication device 3003 is combined at the timing “2”, and the data to be transmitted to the communication device 3004 is combined at the timing “3”.

The communication device 3002 includes the receiving device according to the above-described third embodiment, fourth embodiment or fifth embodiment, and among the data combined in the transmission signal of the communication device 3001, At timing "1", the divided data directly spread by the spreading code series "A" and the spreading code series "B" can be received.

The communication device 3003 has the timing "of the data combined in the transmission signal of the communication device 3001".
2 "includes a receiving device capable of receiving the combined data. It is only necessary to be able to receive the data in synchronism with a specific timing, so that the receiving device having a simple configuration shown in FIG. 31, for example, can realize the communication device 3004. , Communication device 300
A receiving device capable of receiving the data combined at the timing “3” of the data combined in one transmission signal is included, and can be realized by a simple receiving device like the communication device 3003.

In the communication system shown in FIG. 25, it is possible to transmit data from the communication device 3001 to the communication devices 3002 to 3004 all at once, and moreover, a plurality of data which are combined into the simultaneously transmitted signal are combined. Can be independently reproduced in the communication devices 3002 to 3004.

The data transmission rate to the communication device 3002 is the same as the communication device 3003 and the communication device 300.
The transmission rate for 4 is doubled. Communication device 3
If you want to further increase the transmission rate of 002,
The number of data to be combined should be increased. As described above, since it is possible to provide each communication device with a receiving device having a structure suitable for a required transmission rate, it is possible to simplify the structure of the communication device. For example, a wireless LA built in the home
In the N system, for a device that handles various types of information sources such as a set top box, by providing a receiving device capable of synthesizing and reproducing a plurality of divided data, such as the communication device 3002, a higher transmission rate can be obtained. Can have Further, for a terminal device that requires only a low transmission rate, the device configuration can be simplified by providing a receiving device with a simple configuration as shown in FIG.

<Seventh Embodiment> Next, a communication system according to a seventh embodiment of the present invention will be described. In this embodiment, the number of data divisions can be changed according to the measurement result of the reception characteristic.

FIG. 26 is a schematic block diagram showing a configuration example of a communication system according to the seventh embodiment of the present invention. FIG. 26A is a schematic block diagram of communication device 3001 that mainly transmits data in the communication system shown in FIG. 25. The same reference numerals used in FIG. 1 and FIG. 26A indicate the same components. The transmission unit 301 is, for example, the data division unit 10 in the transmission device shown in FIG. 1 or 9.
2 has a function equivalent to that of a block having a configuration subsequent to that in FIG. 2, and the modulated impulse train generated by directly spreading the data divided by the data dividing unit 102 with a predetermined spreading code sequence has a predetermined timing. The impulse train combined in (1) is transmitted from an antenna or the like. The receiving unit 302 is a block that receives a signal from the communication device 300B in FIG. 26B described later. Division number determination unit 303
Is based on the measurement data described later included in the signal received from the communication device 3002 of FIG. 26B.
The number of divisions in 2 "is determined. Data division unit 102"
Is the number of divisions determined by the division number determination unit 303,
Split the original data.

FIG. 26B is a communication device 3002 mainly for receiving data in the communication system shown in FIG.
2 is a schematic block diagram of FIG. The receiving unit 304 has a function equivalent to that of the receiving device described in the third to fifth embodiments, for example, receives the impulse train transmitted from the communication device 3001, and receives the source before division. Play the data. The signal-to-noise ratio measuring unit 305 includes the receiving unit 30.
4. Measure the signal-to-noise ratio based on the signal received at 4. The received signal strength measuring unit 306 measures the received signal strength based on the signal received by the receiving unit 304. Error rate measuring section 307 measures the error rate of the received data based on the signal received by receiving section 304.
The transmitting unit 308 transmits the measurement results of the signal-to-noise ratio measuring unit 305, the received signal strength measuring unit 306, and the error rate measuring unit 307 to the communication device 3001 shown in FIG. 26A.

Now, the operation of the communication system of FIG. 26 having the above-mentioned configuration will be described. Communication device 3001
In, for example, the impulse train is transmitted from the transmitting unit 301 after setting a predetermined condition (a value of transmission data, a strength of a transmission signal, etc.). This impulse train is a communication device 3
The signal-to-noise ratio, the received signal strength, and the error rate of the received signal received by the receiving unit 304 of 002 are measured. This measurement data is transmitted from the transmission unit 308 of the communication device 3002 and the reception unit 302 of the communication device 3001.
To be received. Based on the measurement data included in the received data, the number of divisions of the data is determined by the division number determination unit 303, and the number of divisions of the data division unit 102 ″ is set according to this determination result. When it is determined that the state is good, the number of data divisions is increased to control the transmission rate.

As described above, according to the communication system shown in FIG. 26, the number of divisions of the transmission data can be changed based on the measurement result of the reception characteristic of one communication device. That is, since the optimum number of data divisions can be set according to the communication state, for example, when the communication state is better than usual, the number of data divisions can be increased to increase the transmission rate.

The block for measuring the reception characteristic is shown in FIG.
It is not limited to the example of 6B. For example, at least one of the signal-to-noise ratio measuring unit 305, the received signal strength measuring unit 306, or the error rate measuring unit 307 may be used. Alternatively, a block for measuring other reception characteristics may be provided.

In the example of FIG. 26, the communication device 3001
Are set as the transmitting side and the communication device 3002 is set as the receiving side, but a receiving device and a transmitting device which are equivalent to each other may be provided.

Next, another configuration example of the communication system according to the seventh embodiment of the present invention will be described with reference to the block diagram of FIG. FIG. 27A shows a communication device 300 that mainly transmits data in this communication system.
FIG. 26B is a schematic block diagram of a communication device 3002 ′ that mainly receives data. Compared to the communication device 3002 of FIG. 26B, in the communication device 3002 ′, the number of data divisions is determined based on the measurement results of the signal-to-noise ratio measuring unit 305, the received signal strength measuring unit 306 and the error rate measuring unit 307. A division number determination unit 309 is provided, and the determination result is transmitted from the transmission unit 308. Also, FIG.
In the communication device 3001 ′, the division number determination unit 303 is omitted and the reception unit 30 is different from the communication device 3001 of FIG.
The division number in the data division unit 102 ″ is set according to the determination result of the division number received in 2.

Here, the operation of the communication system of FIG. 27 having the above configuration will be described. Communication device 300
In 1 ′, for example, a predetermined condition (a value of transmission data, a strength of a transmission signal, etc.) is set, and then an impulse train is transmitted from the transmission unit 301. The impulse train is received by the receiving unit 304 of the communication device 3002 ′, and the signal-to-noise ratio of the received signal, the received signal strength, and the error rate are measured. Division number determination unit 30 of communication device 3002 ′
In 9, the number of data divisions is determined based on this measurement data, and the determination result is transmitted from the transmission unit 308 of the communication device 3002 ′. Receiver 3 of communication device 3001 '
The number of divisions of the data division unit 102 ″ is set according to the above-described determination result included in the signal received in 02.

As described above, also in the communication system shown in FIG. 27, the optimum number of data divisions according to the communication state can be set by the same operation as in the communication system shown in FIG.

The present invention is not limited to the first to seventh embodiments described above, and various modifications obvious to those skilled in the art can be made. For example, in each of the above-described embodiments, the case where the impulse signal modulation method is BPSK is mainly described, but the present invention is not limited to this and is applicable to other modulation methods such as PPM. Is. Also, the number of divisions of transmission / reception data in the transmission device and the reception device, the type of transmission / reception timing, the type of spreading code sequence used for direct spreading, the number of transmission / reception channels in the communication system, the transmission / reception timing and spreading code sequence used in each transmission / reception channel. The combination with
Both are arbitrary.

[0183]

According to the present invention, firstly, the transmission rate can be increased as compared with the conventional case. Second, the transmission rate can be changed appropriately according to the communication state.

[Brief description of drawings]

FIG. 1 is a schematic block diagram showing a configuration example of a transmission device according to a first embodiment of the present invention.

FIG. 2 is a schematic block diagram showing an example of a specific configuration of an impulse output section.

FIG. 3 is a diagram showing an example of waveforms of respective parts in the transmitting apparatus shown in FIG.

FIG. 4 is a diagram showing an example of two modulated impulse sequences output at the same timing and a composite waveform thereof.

FIG. 5 is a diagram showing an example of four modulated impulse trains generated at two kinds of timings, an impulse train composed of modulated impulse trains at respective timings, and a waveform of a transmission signal.

FIG. 6 is a schematic block diagram showing another configuration example of the transmission device according to the first embodiment of the present invention.

FIG. 7 is a schematic block diagram showing another configuration example of the transmission device shown in FIGS. 1 and 6 including a device that processes a signal according to a program.

8 is a flowchart showing an example of a program of a transmission processing unit in the transmission device shown in FIG.

FIG. 9 is a schematic block diagram showing a configuration example of a transmission device according to a second embodiment of the present invention.

FIG. 10 is a schematic block diagram showing another configuration example of the transmission apparatus according to the second embodiment of the present invention.

FIG. 11 is a schematic block diagram showing a configuration example of a receiving device according to a third embodiment of the present invention.

12 is a diagram showing an example of signal waveforms of respective parts in the receiving device shown in FIG.

FIG. 13 is a schematic block diagram showing another configuration example of the receiving device according to the third embodiment of the present invention.

14 is a diagram showing an example of signal waveforms of respective parts in the receiving apparatus shown in FIG.

FIG. 15 is a schematic block diagram showing another configuration example of the receiving device shown in FIGS. 11 and 13 including a device that processes a signal according to a program.

FIG. 16 is a schematic block diagram showing an example of a configuration in which an integral value of a correlation signal is converted into a digital value and processed by a reception processing unit.

17 is a flowchart showing an example of a program in the reception processing unit of the receiving device shown in FIG.

FIG. 18 is a schematic block diagram showing a configuration example of a receiving device according to a fourth embodiment of the present invention.

FIG. 19 is a schematic block diagram illustrating another configuration example of the receiving device according to the fourth embodiment of the present invention.

FIG. 20 is a schematic block diagram showing another configuration example of the receiving device shown in FIGS. 18 and 19 including a device that processes a signal according to a program.

FIG. 21 is a flowchart showing an example of a program in the reception processing unit of the reception device shown in FIG. 15 or 20.

FIG. 22 is a schematic block diagram showing a configuration example of a reception device according to a fifth embodiment of the present invention.

23 is a diagram showing an example of signal waveforms of respective parts of the receiving apparatus shown in FIG.

FIG. 24 is a schematic block diagram showing another configuration example of the receiving apparatus according to the fifth embodiment example of the present invention.

FIG. 25 is a schematic block diagram showing a configuration example of a communication system according to a sixth embodiment of the present invention.

FIG. 26 is a schematic block diagram showing a configuration example of a communication system according to a seventh embodiment of the present invention.

FIG. 27 is a schematic block diagram showing another configuration example of the communication system according to the seventh embodiment of the present invention.

[Fig. 28] Fig. 28 is a diagram for explaining the outline of a UWB wireless communication system.

FIG. 29 is a diagram showing a specific example of a signal waveform in the UWB method in comparison with a signal waveform in a normal communication method using a continuous wave.

FIG. 30 is a block diagram showing a schematic configuration of a conventional UWB transmission apparatus.

FIG. 31 is a block diagram showing a schematic configuration of a conventional UWB receiver.

32 is a diagram showing signal waveforms of respective parts in the transmitter of FIG. 30 and the receiver of FIG. 31.

[Explanation of symbols]

101, 101 '... Transmission data processing unit, 102, 10
2 ', 102 "... Data division unit, 103a to 103d ...
Transmission buffers 104a to 104d, 107a, 107
b ... Direct diffusion processing unit, 105a to 105d, 108a,
108b ... Impulse output section, 1051, 1053 ... Pulse generation section, 1052 ... Delay section, 1054 ... Timing control section, 106, 109, 109 '... Impulse synthesis section, 110 ... Transmission processing section, 111 ... Impulse generation section,
201a to 201d, 213a to 213d, 215 ... Correlation detection unit, 2011a, 2011b, 2131a, 21
31b ... Impulse correlation detector, 2012a to 2012
d, 2132a to 2132d ... Spreading code multiplying unit, 20
2a to 202d, 210a to 210h, 214a to 21
4d, 217 ... Integrator, 203a to 203d, 212a
-212d, 215a, 215b ... Data determination unit, 20
4a to 204d ... Timing control unit, 207 ... Data combining unit, 208 ... Received data processing unit, 209a to 209
h, 218 ... Extraction unit, 211a to 211d ... Comparison unit, 2
16 ... Reception processing unit, 1001 to 1005 ... Transmission device, 2
001 to 2008 ... Receiving device, 3001 to 3004 ... Communication device.

Claims (35)

[Claims] 1. A transmission device for converting a supplied transmission data sequence into an impulse sequence and transmitting the impulse data sequence, wherein the transmission data sequence is divided into a plurality of divided data sequences, and a plurality of divided data sequences are generated. Direct spreading means for directly spreading a divided data string by a predetermined spreading code string to generate a plurality of spread data strings, and a modulation impulse in which a reference impulse string of a predetermined cycle is modulated according to the plurality of spread data strings. A transmission device comprising: an impulse output means for outputting a sequence by shifting a timing by a predetermined time within the cycle; and a synthesizing means for synthesizing the plurality of output modulated impulse sequences. 2. The impulse output means outputs, at different timings within the period, modulation impulses by a spread data string directly spread by spread code strings having no orthogonal relationship with each other. Transmitter. 3. The direct spreading means performs composite spreading based on at least two divided data strings of the plurality of divided data strings and at least two spreading code strings orthogonal to each other corresponding to the divided data strings. A data train is generated, and the impulse output means is a modulated impulse train in which the polarity and amplitude of each impulse of the reference impulse train is modulated according to the composite spread data train, and the timing is given for a predetermined time within the cycle. The transmission device according to claim 1, wherein the transmission device shifts the output. 4. The direct diffusion means comprises the at least 2
The transmission device according to claim 3, wherein one of the divided data strings is directly spread by a corresponding spreading code string, and a data string obtained by combining the results of the direct spreading is generated as the composite spread data string. . 5. The direct spreading means receives a transmission data string different from a transmission data string divided by the data dividing means, and directly spreads the transmission data with a predetermined spreading code string, thereby making the plurality of the plurality of data spread. The transmission device according to claim 1, which generates at least a part of the spread data string of the spread data string. 6. The transmission device according to claim 1, wherein the impulse output means sequentially outputs a modulation impulse in which the polarity of the reference impulse is modulated according to each data value of the spread data string. 7. The transmitter according to claim 1, wherein the impulse output means sequentially outputs a modulated impulse in which the position of the reference impulse in the cycle is modulated according to each data value of the spread data string. 8. A transmission method for converting a supplied transmission data sequence into an impulse sequence and transmitting the impulse sequence, wherein the transmission data sequence is divided into a plurality of divided data sequences, and the plurality of divided data sequences are generated. Directly spread with a predetermined spreading code string to generate a plurality of spread data strings, and a reference impulse string of a predetermined cycle is modulated in accordance with the plurality of spread data strings. In the transmission method, the timings are shifted by a predetermined time and combined. 9. The transmission method according to claim 8, wherein the modulated impulse trains of the spread data trains directly spread by the spreading code trains that are not orthogonal to each other are combined at different timings within the cycle. 10. A composite spread data string is generated based on at least two split data strings of the plurality of split data strings and at least two spread code strings orthogonal to each other corresponding to the respective split data strings. The modulated impulse train in which the polarity and amplitude of each impulse of the reference impulse train are modulated according to the composite spread data train is synthesized by shifting the timing by a predetermined time within the cycle. How to send. 11. A spread data string which is different from the send data string divided into the divided data strings is directly spread by a predetermined spread code string to thereby spread at least a part of the spread data strings. The transmission method according to claim 8, which is generated. 12. A transmission data string is divided into a plurality of parts, each divided data string is directly spread by a predetermined spreading code string, and a reference impulse string having a predetermined cycle according to the spread data string generated by the direct spreading. Is a receiving device for receiving a transmission signal in which the modulated impulse trains that have respectively modulated are shifted in timing by a predetermined time within the above cycle, and the reference impulse train is modulated according to a predetermined spread code train. Correlation between the plurality of impulse trains and the transmission signal, detected by shifting the timing by a predetermined time respectively in the period, and a correlation signal generation means for generating a plurality of correlation signals according to the detection result, Integrating means for integrating the plurality of correlation signals respectively for a predetermined period, and determining the data values of the plurality of divided data strings according to the integrated value of the integrating means. A receiving device comprising: a determining unit that determines the determined divided data string; 13. Impulse correlation detection means for detecting the correlation between the transmission signal and the reference impulse train by shifting the timing by a predetermined time respectively and generating a plurality of impulse correlation signals according to the detection result. 13. The correlation signal generation means according to claim 12, wherein the correlation signal generation means generates the correlation signal by sequentially inverting the polarities of the plurality of impulse correlation signals according to respective code values of a predetermined spread code sequence. Receiver. 14. A transmission data sequence is divided into a plurality of divisions, each division data sequence is directly spread by a predetermined spreading code sequence, and a reference impulse sequence having a predetermined cycle according to the spread data sequence generated by the direct diffusion. Is a receiving device that receives a transmission signal in which the modulated impulse trains that have respectively modulated are shifted in timing by a predetermined time within the above-described cycle, and the reference impulse train is modulated according to a predetermined spread code train. Correlation between the plurality of impulse trains and the transmission signal, detected by shifting the timing by a predetermined time respectively in the period, and a correlation signal generation means for generating a plurality of correlation signals according to the detection result, From each of the plurality of correlation signals, the spread is performed for each combination of the data values of the divided data that are combined at the same timing on the transmission side. Extracting means for extracting a signal corresponding to a specific bit of the code sequence, integrating means for integrating the signals extracted by the extracting means for a predetermined period, and extracting for each combination from the same correlation signal by the extracting means. Comparing the integrated values of the plurality of signals obtained by the integrating means with each other, and outputting the integrated value selected according to the comparison result for each of the correlation signals; and the integrated value output from the comparing means. Then, the receiving device has a determining means for determining the data value of the divided data sequence and a synthesizing means for synthesizing the determined divided data sequence and reproducing the transmission data sequence. 15. Impulse correlation detection means for detecting the correlation between the transmission signal and the reference impulse train by shifting the timing by a predetermined time, and generating a plurality of impulse correlation signals according to the detection result. 15. The correlation signal generating means according to claim 14, wherein the correlation signal generating means sequentially inverts polarities of the plurality of impulse correlation signals according to respective code values of a predetermined spread code sequence to generate the correlation signal. Receiver. 16. A transmission data string is divided into a plurality of pairs of data strings, the plurality of divided data strings pairs are directly spread by orthogonal spreading code strings forming a pair, and a plurality of pieces generated by the direct spreading. A receiving device for receiving a transmission signal in which a plurality of modulated impulse train pairs each of which is obtained by modulating a reference impulse train of a predetermined cycle in accordance with the spread data train pair are combined with their timings shifted by a predetermined time within the cycle. The reference impulse sequence according to the first combined data sequence obtained by combining two data sequences obtained when the data of the same value is directly spread by the above-mentioned spread code sequence pair for each divided data sequence pair. The correlation between the modulated impulse train that has been modulated and the transmission signal is detected by shifting the timing by a predetermined time within the period, and the first correlation signal corresponding to the detection result is detected. And a second combination that combines two data strings obtained when the data of different values are directly spread in the spreading code string pair for each of the divided data string pairs. The correlation between the modulated impulse train obtained by modulating the reference impulse train according to the data train and the transmission signal is detected by shifting the timing by a predetermined time within the cycle, and the second correlation is detected according to the detection result. Second correlation signal generating means for generating signals, first integrating means for integrating the first correlation signal for a predetermined period, and second integrating means for integrating the second correlation signal for a predetermined period. And a result of comparing the integrated values of the first integrating means and the second integrating means corresponding to the same pair of divided data strings with each other, and one integrated value selected according to the comparison result. Based on the polarity, and determining means for determining data values of each of the divided data string pairs, by combining the divided data array pairs, which are the determination,
A receiving device having a synthesizing unit for reproducing the transmission data string. 17. The first correlation signal generating means is responsive to a correlation detection result between the modulation impulse corresponding to specific combined data in the first combined data string and the transmission signal, to obtain the first correlation signal. And the second correlation signal generation means is responsive to the correlation detection result between the modulation impulse corresponding to specific combined data in the second combined data sequence and the transmission signal. The receiving device according to claim 16, which generates a second correlation signal. 18. The correlation between the transmission signal and the reference impulse train is detected by shifting the timing for each divided data train pair by a predetermined time, and a plurality of impulse correlation signals corresponding to the detection results are generated. And a first correlation signal generating means for sequentially inverting the polarity of the impulse correlation signal according to each code value of the first combined data sequence. A signal is generated, and the second correlation signal generation means generates the second correlation signal by sequentially inverting the polarity of the impulse correlation signal according to each code value of the second combined data string. The receiving device according to claim 16. 19. A transmission data sequence is divided into a plurality of divisions, each division data sequence is directly spread by a predetermined spreading code sequence, and a reference impulse sequence having a predetermined cycle according to the spread data sequence generated by the direct spreading. Is a receiving method of receiving a transmission signal in which the modulated impulse trains that are respectively modulated are shifted in timing by a predetermined time within the above cycle, and the reference impulse train is modulated according to a predetermined spread code train. Correlation between the plurality of impulse trains and the transmission signal is detected by shifting the timing by a predetermined time in the cycle, and a plurality of correlation signals are generated according to the detection result, and the plurality of correlation signals are generated. Are respectively integrated for a predetermined period, and the data values of the plurality of divided data strings are determined according to the integrated values of the plurality of correlation signals. By combining the over data columns receiving method for reproducing the transmission data sequence. 20. A transmission data sequence is divided into a plurality of divisions, each division data sequence is directly spread by a predetermined spreading code sequence, and a reference impulse sequence having a predetermined cycle is generated according to the spread data sequence generated by the direct spreading. Is a receiving method of receiving a transmission signal in which the modulated impulse trains that are respectively modulated are shifted in timing by a predetermined time within the above cycle, and the reference impulse train is modulated according to a predetermined spread code train. Correlation between the plurality of impulse trains and the transmission signal is detected by shifting the timing by a predetermined time in the cycle, and a plurality of correlation signals are generated according to the detection result, and the plurality of correlation signals are generated. From each of the above, for each combination of the data values of the divided data that are combined at the same timing on the transmission side, the specific bit of the spreading code string is The signal corresponding to is extracted, the extracted signals are respectively integrated for a predetermined period, and the integrated values in the integration step of a plurality of signals extracted for each combination from the same correlation signal are compared with each other, and the comparison result According to the above, the integrated value is selected for each of the correlation signals, the data value of the divided data string is determined according to the selected integrated value, the determined divided data string is synthesized, and the transmission data is transmitted. Receiving method to replay columns. 21. A transmission data string is divided into a plurality of pairs of data strings, the plurality of divided data strings pairs are directly spread by orthogonal spreading code strings forming a pair, and a plurality of pieces generated by the direct spreading. A receiving method for receiving a transmission signal in which a plurality of modulated impulse train pairs each modulating a reference impulse train of a predetermined cycle in accordance with the spread data train pair are shifted in timing by a predetermined time The first combined data string obtained by combining two data strings obtained when the data having the same value is directly spread by the spreading code string pair, and the data having different values by the spreading code string pair are directly spread. The two modulated impulse sequences obtained by modulating the reference impulse sequence according to the second synthesized data sequence obtained by synthesizing the two data sequences obtained in the above For each pair of the divided data strings, the timing is shifted by a predetermined time within the cycle, and the first correlation signal and the second correlation signal corresponding to the detection result are generated, respectively. As a result of integrating the first correlation signal and the second correlation signal respectively for a predetermined period, and comparing the integrated values of the first correlation signal and the second correlation signal corresponding to the same pair of divided data strings with each other, And, based on the polarity of one of the integrated values selected according to the comparison result, to determine the data value of each of the divided data string pairs, and to combine each of the determined divided data string pairs,
A receiving method for reproducing the transmission data string. 22. A communication system comprising: a first communication device that converts information into an impulse train and transmits the impulse train; and a second communication device that receives the impulse train and reproduces information. The communication device divides the supplied transmission data string and generates a plurality of divided data strings, and a plurality of divided data strings that are directly spread by a predetermined spreading code string. Impulses for generating a sequence and a modulated impulse sequence in which a reference impulse sequence of a predetermined period is modulated in accordance with the plurality of spread data sequences, respectively, with timings shifted by a predetermined time within the period and output. The second communication device includes an output unit and a combining unit that combines the plurality of output modulated impulse trains to generate a transmission signal. Correlation between the transmitted impulse signal and a plurality of impulse trains that have modulated the reference impulse train according to the pulse train, and detect the timing by shifting the timing for each predetermined time within the cycle, and depending on the detection result. Correlation signal generating means for generating a plurality of correlation signals, integrating means for respectively integrating the plurality of correlation signals for a predetermined period, and data values of the plurality of divided data strings are determined according to the integrated value of the integrating means. A communication system, comprising: a determination unit that performs the above-described determination, and a synthesis unit that synthesizes the determined divided data strings and reproduces at least a part of the transmission data string. 23. The correlation between at least one impulse train obtained by modulating the reference impulse train according to a predetermined spread code train and the transmitted transmission signal is shifted in timing by a predetermined time within the cycle. Correlation signal generation means for detecting and generating at least one correlation signal according to the detection result, integration means for integrating the at least one correlation signal for a predetermined period, and the transmission according to the integrated value of the integration means. The communication system according to claim 22, further comprising a third communication device including a determination unit that determines at least a part of the data value of the data string. 24. The second communication device includes a measuring unit that measures a predetermined reception characteristic of the transmitted transmission signal, and a transmitting unit that transmits a measurement result of the measuring unit. The communication device has a receiving means for receiving a signal transmitted from the second communication device, and the data dividing means of the first communication device, according to the measurement result included in the received signal, The communication system according to claim 22, wherein the number of divisions of the transmission data string is set. 25. The communication system according to claim 24, wherein the measuring means measures at least one of a signal-to-noise ratio, a received signal strength and an error rate as the reception characteristic. 26. A communication method between a first communication device that converts information into an impulse train and transmits the impulse train, and a second communication device that receives the impulse train and reproduces the information, the method comprising: In the communication device, the supplied transmission data string is divided to generate a plurality of divided data strings, and the plurality of divided data strings are directly spread with a predetermined spreading code string to generate a plurality of spread data strings, A reference impulse train of a predetermined cycle is modulated in accordance with the plurality of spread data trains, and a modulated impulse train is generated by combining the modulated impulse trains with respective timings shifted by a predetermined time within the cycle to generate a transmission signal. In the communication device, the correlation between a plurality of impulse trains obtained by modulating the reference impulse train in accordance with a predetermined spread code train and the transmitted transmission signal is respectively determined within the cycle. Detecting by shifting the timing by a fixed time, generating a plurality of correlation signals according to the detection result, integrating the plurality of correlation signals for a predetermined period, respectively, according to the integrated value of the plurality of correlation signals, A communication method for determining data values of a plurality of divided data strings, synthesizing the determined divided data strings, and reproducing the transmission data string. 27. In the second communication device, a predetermined reception characteristic of the transmitted transmission signal is measured, and the measurement result is transmitted from the second communication device to the first communication device, 27. The communication method according to claim 26, wherein the number of divisions of the transmission data string is set according to the measurement result included in the signal transmitted to the first communication device. 28. A processing device for processing a supplied transmission data string and causing a impulse generation means to generate a transmission impulse string according to the processing result is divided into a plurality of divided data by dividing the supplied transmission data string. A step of generating a sequence, a step of directly spreading each of the plurality of divided data strings by a predetermined spreading code string to generate a plurality of spread data strings, and a step of generating a reference impulse string of a predetermined cycle by the plurality of spread data strings. And a step of causing the impulse generating means to generate a transmission impulse train in which the modulated impulse trains respectively modulated in accordance with the above are shifted in timing by a predetermined time and synthesized. 29. In the step of generating the transmission impulse train, the modulation impulse train is generated in the impulse generating means by shifting the timing of each of the modulation impulse trains by a predetermined time in the cycle, and the modulation impulse train is generated in the synthesizing means. The program according to claim 28, wherein the program is combined to generate a transmission impulse. 30. In the step of generating the transmission impulse train, modulation impulse trains corresponding to spread data trains directly spread by spreading code trains that are not orthogonal to each other are generated at different timings within the cycle. The program according to claim 28, which generates a combined transmission impulse train. 31. In the step of generating the spread data string, at least two split data strings of the plurality of split data strings and at least two spread code strings that are orthogonal to each other and correspond to the respective split data strings. Based on the step of generating a composite spread data sequence and generating the transmit impulse sequence,
A modulated impulse train in which the polarity and amplitude of each impulse of the reference impulse train is modulated according to the composite spread data train, generates a combined transmission impulse train by shifting the timing by a predetermined time within the period, The program according to item 28. 32. In the step of generating the spread data string, a transmission data string different from the transmission data string divided into the divided data strings is directly spread by a predetermined spreading code string to thereby obtain the plurality of spread data strings. The program according to claim 28, which generates a diffusion data sequence of at least a part of the sequences. 33. A transmission data sequence is divided into a plurality of divisions, each division data sequence is directly spread by a predetermined spreading code sequence, and a reference impulse sequence having a predetermined cycle is generated according to the spread data sequence generated by the direct diffusion. The modulated impulse trains, which are respectively modulated, process the combined transmission signals by shifting the timings for the respective predetermined times within the above-mentioned cycle, and reproduce the transmission data trains by the processing device according to the predetermined spreading code trains. Correlation between a plurality of impulse trains modulated the reference impulse train and the transmission signal, the timing is shifted by a predetermined time in the cycle, and the correlation detection means detects the correlation, and a plurality of detection signals are detected. A step of generating a correlation signal, a step of integrating each of the plurality of correlation signals for a predetermined period, and depending on an integrated value of the plurality of correlation signals, A program for executing a process including a step of determining data values of the plurality of divided data strings and a step of synthesizing the determined divided data strings and reproducing the transmission data string. 34. A transmission data sequence is divided into a plurality of divisions, each division data sequence is directly spread by a predetermined spreading code sequence, and a reference impulse sequence having a predetermined cycle is generated according to the spread data sequence generated by the direct spreading. The modulated impulse trains, which are respectively modulated, process the combined transmission signals by shifting the timings for the respective predetermined times within the above-mentioned cycle, and reproduce the transmission data trains by the processing device according to the predetermined spreading code trains. Correlation between a plurality of impulse trains modulated the reference impulse train and the transmission signal, the timing is shifted by a predetermined time in the cycle, and the correlation detection means detects the correlation, and a plurality of detection signals are detected. Step of generating a correlation signal, and data of divided data that is synthesized at the same timing on the transmission side from each of the plurality of correlation signals For each combination of the above, a step of extracting a signal corresponding to a specific bit of the spread code string, a step of integrating the extracted signals for a predetermined period, respectively, a plurality of signals extracted for each combination from the same correlation signal. Comparing the integrated values of the signals in the integration step with each other, and selecting an integrated value for each of the correlation signals according to the comparison result; and a data value of the divided data string according to the selected integrated value. And a step of synthesizing the determined divided data strings and reproducing the transmission data string. 35. A transmission data string is divided into a plurality of pairs of data strings, the plurality of divided data string pairs are directly spread by orthogonal spreading code strings forming a pair, and a plurality of pieces generated by the direct spreading. A plurality of modulated impulse train pairs each modulating a reference impulse train of a predetermined cycle according to the spread data train pair, processing the transmission signal synthesized by shifting the timing by a predetermined time in the cycle respectively, A first combined data string obtained by combining two data strings obtained when the data having the same value is directly spread by the spreading code string pair to the processing device for reproducing the transmission data string, and the spreading code string pair. Two modulation impulses obtained by modulating the reference impulse train in accordance with a second combined data train obtained by combining two data trains obtained when data of different values are directly spread The correlation between the transmission signal and the transmission signal is detected by the correlation detecting means for each pair of divided data strings by shifting the timing by a predetermined time within the cycle, and the first correlation signal and the first correlation signal corresponding to the detection result are detected. Generating two correlation signals, integrating the first correlation signal and the second correlation signal for a predetermined period, respectively, the first correlation signal and the first correlation signal corresponding to the same pair of divided data strings, and Determining the data value of each of the divided data string pairs based on the result of comparing the integrated values of the second correlation signals with each other and the polarity of one of the integrated values selected according to the comparison result; Combining each divided data string pair determined,
A program for executing a process including the step of reproducing the transmission data string.