JPH11298370A - Spread spectrum communication system and transmitter for spread spectrum communication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accelerate a data transmission speed, to perform miniaturization and to reduce a cost. SOLUTION: In this transmitter 61, spread spectrum signals Sa-Sf are generated by performing a modulation processing by using parallel transmission data TxDa-TxDf for which transmission data TxD are serial/parallel converted, PN codes PNa-PNf and a carrier wave (f) and transmission signals S are generated by performing an addition processing. As the PN codes PNa-PNf, the ones whose array patterns are partially matched with each other are adopted. In a receiver 81, the electrode pattern of the input electrode of the matched filter of a demodulator 82 is matched with the array pattern of the PN code PNa. The array patterns of the spread spectrum signals Sa-Sf included in reception signals S are partially matched with the electrode pattern and correlation peak signals corresponding to the matching degree are outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitting apparatus for spread spectrum communication for generating and transmitting a spread spectrum signal by performing modulation processing using an information signal, a spreading code having a predetermined spreading factor (predetermined code length) and a carrier. A spread-spectrum communication system comprising: a transmission signal transmitted from the spread-spectrum communication transmission device as a reception signal to generate the information signal; Related to a transmission device.

[0002]

2. Description of the Related Art Conventionally, terminals such as a personal computer and a host computer have a communication function, and a wired LAN (Local Area Network) for realizing data transmission between the terminals by connecting the terminals with a dedicated cable.
Network) is widely used. In recent years, the data transmission speed in such a wired LAN is 10M.
About bit / s is becoming mainstream.

On the other hand, with the advancement of telecommunication technology, wireless LANs are also becoming widespread. This wireless LAN is a system that can eliminate the need for wiring equipment such as a dedicated cable for the above-described wired LAN. Has the advantage that it can be easily expanded or the terminal can be easily moved.

[0004] As one of such wireless LANs, there is one using a 2.4 GHz band at present.
In a wireless LAN using the 2.4 GHz band, a spread spectrum communication system is approved. Hereinafter, the spread spectrum communication method will be briefly described.

In a spread spectrum communication system, a transmission device for spread spectrum communication uses, for example, a pseudo-noise code (hereinafter referred to as PN) as a spread code with transmission data (information signal).
(Pseudo Random Noise) code) is subjected to modulation processing (spreading processing) to generate a modulated signal, and the modulated signal is used to modulate a carrier wave by a two-phase modulation scheme to generate a spread spectrum signal. Is generated and transmitted, and the spread spectrum communication receiving apparatus demodulates the spread spectrum signal transmitted from the spread spectrum communication transmitting apparatus with a PN code having the same arrangement pattern as the PN code used on the transmitting apparatus side. The received data (information signal) is generated by performing the (despreading process).

[0006] In this spread spectrum communication system, the spreading factor (code length) of the PN code is generally 10 chips or more so as to conform to the domestic standard, and the data transmission rate is higher. , The signal bandwidth is divided by the spreading factor. Here, the signal bandwidth is a value that is 1/2 of the occupied bandwidth, and since the occupied bandwidth is specified by law to be 26 MHz or less between 2471 MHz and 2497 MHz, it is 13 MHz or less accordingly. It has become. Therefore, the data transmission rate is maximized under the condition that the occupied bandwidth is 26 MHz and the spreading factor is 10 chips,
1.3 Mbit / s.

However, in terms of compatibility with the above-described wired LAN, the data transmission rate in the wired LAN is about 10 Mbit / s, as described above, and at least 5 Mbit, which is a half thereof. / S
Not enough considering the required degree. Under such circumstances, conventionally, the following configuration has been considered for the purpose of improving the data transmission speed.

That is, the data transmission speed is improved by modulating the carrier using the four-phase modulation instead of performing the modulation using the two-phase modulation. According to this method, the four-phase modulation scheme can transmit twice the amount of data as the two-phase modulation scheme, so that the data transmission speed can be doubled with a relatively simple configuration. it can. However, even in this case, the data transmission rate is only 2.6 Mbit / s, which is twice the 1.3 Mbit / s, and the above-described wired LA
It is not enough considering compatibility with N.

Further, by modulating a carrier wave by an eight-phase phase modulation method, it is possible to further improve the data transmission speed. Under a line of poor transmission quality, there are problems such as difficulties in reliable data transmission, which is inferior in feasibility.

Therefore, in order to improve the data transmission speed, a configuration disclosed in Japanese Patent Application Laid-Open No. 7-154365 has been considered instead of increasing the degree of freedom of the phase modulation method as described above. Hereinafter, JP-A-7-154
The configuration disclosed in Japanese Patent Publication No. 365 is described with reference to FIG.

In FIG. 17, a spread spectrum communication system 11 includes a spread spectrum communication transmitting apparatus 21 for transmitting a spread spectrum signal and a spread spectrum communication apparatus for receiving a spread spectrum signal transmitted from the spread spectrum communication transmitting apparatus 21. And a receiving device 41.

The transmitting device 21 for spread spectrum communication includes a serial-parallel converter 22 and six spread spectrum modulators (S
S modulators 23 to 28, a carrier generator 29 and an adder 30. The six spread spectrum modulators 23 to 28 each include a PN code generation circuit 31, a binary sum circuit 32, and a phase modulation circuit (PSK modulation circuit) 33, as shown in FIG. ing.

On the other hand, a receiver 41 for spread spectrum communication
Is 6 in the transmission device 21 for spread spectrum communication.
It comprises six spread spectrum demodulators (SS demodulators) 42 to 47 corresponding to the spread spectrum modulators 23 to 28 and a parallel-serial converter 48. The six spread spectrum demodulators 42 to 47 each include a matched filter 49 and a phase detector 50, as shown in FIG.

According to such a configuration, the transmission data TxD
Is transmitted as serial data as spread-spectrum communication transmitter 21
, The transmission data TxD is subjected to serial-parallel conversion in 6-bit units by the serial-parallel converter 22 to become parallel transmission data TxDa to TxDf, and these parallel transmission data TxDa
To TxDf are output to spread spectrum modulators 23 to 28, respectively. In this case, each parallel transmission data TxDa to TxDf
If the spreading factor of the PN codes PNa to PNf to be described later is 12 chips, the occupied bandwidth is 26 MHz or less specified by law, for example, 24 MHz. Thus, the modulation rate is converted to 1 MBaud, that is, the data transmission rate is converted to 1 Mbit / s.

The parallel transmission data TxDa to TxDf
Is applied to the spread spectrum modulators 23 to 28, for example, in the spread spectrum modulator 23, the binary sum circuit 32 modulates (spreads) the PN code PNa output from the PN code generation circuit 31 with the parallel transmission data TxDa. Processing), a modulated signal Pa is generated and output, and the carrier f output from the carrier generator 29 with the modulated signal Pa is modulated by the two-phase modulation method in the phase modulation circuit 33. Gives the spread spectrum signal Sa
Is generated and output.

Subsequently, the spread spectrum modulators 24 to 28 similarly operate in parallel transmission data TxDa and PN
Instead of the code PNa, the parallel transmission data TxDb to Tx
PN code PN output from each PN code generation circuit 31 with Df
b to PNf are subjected to modulation processing (spreading processing),
Modulated signals Pb to Pf are generated and output, and the modulated signals
The carrier f output from the carrier generator 29 in Pb to Pf is 2
The spread spectrum signals Sb to Sf are generated and output by being subjected to the modulation processing by the phase and phase modulation method. still,
In this case, the PN codes PNa to PNf output from the PN code generation circuits 31 of the spread spectrum modulators 23 to 28 are:
The cross-correlation is small.

The spread spectrum signals Sa to Sf
Is supplied to the adder 30, the signals are added to generate a transmission signal S 1, and the transmission signal S
Is transmitted from the antenna 34. Thus, in the spread spectrum communication transmitting apparatus 21, the spread spectrum signal is transmitted.
Sa to Sf are transmitted as transmission signals S.

In response to this, when the transmission signal S transmitted from the transmitter for spread spectrum communication 21 is received by the receiver for spread spectrum communication 41 as the received signal S by the antenna 51, the received signal S becomes Output to the spread demodulators 42 to 47 at the same time.

Here, for example, a spread spectrum demodulator 42
Since the electrode pattern of the input electrode (not shown) of the matched filter 49 is formed so as to match the one-period array pattern of the PN code PNa, the spread spectrum signal Sa included in the received signal S 1 Is matched with the electrode pattern of the input electrode of the matched filter 49. When the pattern matches, the output electrode (not shown) of the matched filter 49 converts the pattern into the spread spectrum signal Sa included in the received signal S. A corresponding correlation peak signal is output. At this time, no correlation peak signal is output for the spread spectrum signals Sb to Sf included in the received signal S because the PN codes PNa to PNf have a small cross-correlation as described above.

The correlation peak signal output from the matched filter 49 is phase-detected by the phase detector 50 to generate and output a demodulated output having a positive or negative peak. Is determined, parallel reception data RxDa corresponding to the parallel transmission data TxDa is generated and output.

In the same manner, in the spread spectrum demodulators 43 to 47, the electrode pattern of the input electrode of each matched filter 49 is formed so as to match the one-period array pattern of the PN codes PNb to PNf. Therefore, the spread spectrum signal Sb included in the received signal S
To Sf match the electrode pattern of the input electrode of each matched filter 49, and when matched, the received signal is output from the output electrode of each matched filter 49.
Correlation peak signals corresponding to the spread spectrum signals Sb to Sf included in S are output.

The correlation peak signal output from each matched filter 49 is phase-detected by the phase detector 50 to generate and output a demodulated output having a positive or negative peak. Is determined, parallel reception data RxDb to RxDf corresponding to the parallel transmission data TxDb to TxDf are generated and output.

The parallel reception data RxDa to RxDf
Is supplied to the parallel-serial converter 48, and they are parallel-serial converted to generate and output the reception data RxD corresponding to the transmission data TxD. Thus, in the spread spectrum communication receiver 41, the received signal S is demodulated, and the received data RxD is generated and output.

As described above, Japanese Patent Application Laid-Open No. 7-154
In the configuration disclosed in Japanese Patent Publication No. 365, the spread spectrum communication transmitting apparatus 21 uses the spread spectrum signals Sa to Sf.
Is subjected to the addition processing, so that the transmission signal S 1 is generated and transmitted.At this time, the occupied bandwidth of the transmission signal S 1 does not generate any signal of a new frequency in the addition processing. The occupied bandwidth of each of the spread spectrum signals Sa to Sf is 24 MHz, and the data transmission rate of the transmission signal S is 6.0 Mbit which is the sum of the data transmission rates of each of the spread spectrum signals Sa to Sf of 1.0 Mbit / s.
/ S. And the receiver 4 for spread spectrum communication.
In FIG. 1, a transmission signal S 1 transmitted from a transmission apparatus 21 for spread spectrum communication is received as a reception signal S 2, and the reception signal S 2 is demodulated to generate reception data RxD.

As described above, Japanese Patent Application Laid-Open No. 7-154365
In the configuration disclosed in Japanese Patent Publication No.
The data transmission speed can be improved.

[0026]

By the way, in a spread spectrum communication system, generally, a process of adding a plurality of spread spectrum signals is relatively easy, but a process of adding a plurality of spread spectrum signals is performed from one spread spectrum signal. The process of separating a plurality of spread spectrum signals is relatively complicated, and accordingly, the process of demodulating received data from each of the plurality of spread spectrum signals is relatively complicated. Therefore, in the configuration disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 7-154365, the six matched filters 49 corresponding to the spread spectrum signals Sa to Sf are adopted in the spread spectrum communication receiver 41. The spread spectrum signals Sa to Sf are separated from the received signal S, and the parallel received data RxDa to RxDf are generated from the spread spectrum signals Sa to Sf.

However, in this case, since the number of the matched filters 49 increases, not only the spread spectrum communication receiving apparatus 41 but also the spread spectrum communication system 11 has a complicated configuration and a large size. Further, there is a problem that the cost increases.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a structure capable of improving a data transmission speed while satisfying conditions stipulated by laws and regulations. A spread spectrum communication system that can be simplified, can be downsized, and can reduce the cost, and a transmitter for spread spectrum communication used in the spread spectrum communication system. To provide.

[0029]

A spread spectrum communication system according to the present invention comprises an information signal, a predetermined spreading factor (a predetermined code length).
A plurality of spread spectrum modulating means for generating and outputting a spread spectrum signal by performing a modulation process using the spread code and the carrier wave, and adding each spread spectrum signal output from each of the plurality of spread spectrum modulation means And a plurality of spread spectrum modulating means, wherein the plurality of spread spectrum modulating means use the spread code used for any one of the spread spectrum modulating means as the other spread spectrum modulating means excluding it. The spread code used for the spread spectrum modulating means is configured such that the arrangement pattern is different from the spread code used in the other spread spectrum modulation means so that the arrangement pattern of the spread code to be obtained is circulated by a predetermined number of codes from the beginning or end. A transmission device and a transmission signal transmitted from the spread spectrum communication transmission device. Correlation peak signal output means for receiving a reception signal and outputting a correlation peak signal when the reception signal matches a spread code used for any one of the plurality of spread spectrum modulation means, An information signal generating means for generating the information signal based on the correlation peak signal output from the correlation peak signal output means. (Claim 1).

According to the spread spectrum communication system having the above-described configuration, in the transmitter for spread spectrum communication, the information signal,
By performing modulation processing using a spreading code and a carrier having a predetermined spreading factor (predetermined code length), a plurality of spread spectrum signals are generated and output.

At this time, the spreading code used for any one of the plurality of spread spectrum modulating means is different from the spreading code used for the other spread spectrum modulating means. Since the arrangement pattern is circulated by a predetermined number of codes from the beginning or end, a plurality of spread codes used in correspondence with each of the plurality of spread spectrum modulation means have their arrangement patterns partially formed. Accordingly, a plurality of spread spectrum signals generated by using a plurality of spreading codes having such a relationship also have a pattern in which their arrangement patterns partially match each other. Becomes Then, a plurality of spread spectrum signals having such a relationship are added by the adding means, so that a transmission signal is generated and transmitted.

In response to this, in the receiver for spread spectrum communication, when the transmission signal transmitted from the transmitter for spread spectrum communication is received as a reception signal,
By the correlation peak signal output means, when the received signal matches the spread code used for any of the plurality of spread spectrum modulation means,
A correlation peak signal is output.

At this time, since the plurality of spread spectrum signals included in the received signal have their arrangement patterns partially coincident with each other as described above, the plurality of spread spectrum signals It will partially match the spread code used for any of the spread spectrum modulation means of the modulation means, and when matched,
The correlation peak signal output means outputs a correlation peak signal according to the degree of the matching. And
The information signal generation means generates an information signal based on the correlation peak signal.

Thus, in this apparatus, a plurality of spread spectrum signals are added to each other in a spread spectrum communication transmitting apparatus to generate and transmit a transmission signal. In the receiving device, when the transmission signal transmitted from the transmission device for spread spectrum communication is received as a reception signal, when the spread spectrum signal included in the reception signal matches the prepared spreading code, the degree of matching is determined. Is output according to the correlation peak signal, and an information signal is generated. At this time, the occupied bandwidth of the transmission signal is equal to the occupied bandwidth of each spread spectrum signal because no signal of a new frequency is generated in the addition processing, and the data transmission speed of the transmission signal is equal to that of each spread spectrum signal. Since the sum of the data transmission speeds is satisfied, it is possible to improve the data transmission speed while satisfying the conditions specified by law.

In the spread spectrum communication receiver, a spread code equal to the spread code used for generating any one of the plurality of spread spectrum signals is provided as the correlation peak signal output means. You only need to prepare at least one thing,
Unlike the related art, it is not necessary to prepare a plurality of correlation peak signal output means so as to correspond to each of a plurality of spread spectrum signals, and thereby, as a spread spectrum communication receiving device, as well as a spread spectrum communication system. Also, the structure can be simplified, the size can be reduced, and the cost can be reduced.

In this case, in the spread spectrum communication system having the above-described configuration, some of the plurality of spread spectrum modulating means are replaced with other spectrums except for the phase of the carrier used for them. It is also possible to provide a phase shift unit that shifts the phase of the carrier wave used in the spread modulation unit so as to be orthogonal to the phase of the carrier wave, and perform a modulation process using the carrier wave whose phase is shifted by the phase shift unit. Good (Claim 2).

In the spread spectrum communication system having the above-described configuration, some of the plurality of spread spectrum modulating means may include: a determining means for determining a value of the information signal; A first spreading code output means for outputting a code, and a second spreading code in which the polarity of the circulated code in the first spreading code output from the first spreading code output means is inverted by a second spreading code. A second spread code output means for outputting a code, and when the determination means determines that the value of the information signal to be used for the modulation process is equal to the value of the information signal used for the immediately preceding modulation process, As the spreading code used for the modulation process, the one of the first spreading code and the second spreading code that is equal to the spreading code used for the immediately preceding modulation process is selected, When the stage determines that the value of the information signal to be used for the modulation process is different from the value of the information signal used for the immediately preceding modulation process, the first spreading code and the second spreading code are used as the spreading codes to be used for the modulation process. A configuration may be adopted in which one of the spread codes different from the spread code used for the immediately preceding modulation process is selected (claim 3).

Further, in the spread spectrum communication system having the above-described configuration, the correlation peak signal output means and the information signal generation means may be constituted by delay detection means.

A transmitter for spread spectrum communication according to the present invention generates and outputs a spread spectrum signal by performing modulation processing using an information signal, a spreading code having a predetermined spreading factor (predetermined code length) and a carrier. Spread spectrum modulation means, and an addition means for adding each spread spectrum signal output from each of the plurality of spread spectrum modulation means and transmitting as a transmission signal, the plurality of spread spectrum modulation means, Regarding the spreading code used for any of the spread spectrum modulating means, the arrangement pattern of the spreading code used for the other spread spectrum modulating means other than the spread code is circulated by a predetermined number of codes from the beginning or end. The arrangement pattern is different from that of the spread code used for the other spread spectrum modulation means. And where the has a feature (Claim 5).

According to the transmission apparatus for spread spectrum communication having the above-mentioned configuration, the arrangement pattern is similar to the transmission apparatus for spread spectrum communication used in the spread spectrum communication system according to any one of claims 1 to 4. Are generated, and a plurality of spread spectrum signals are added to each other, so that a transmission signal is generated and transmitted.

Therefore, there is already a receiving apparatus having as a correlation peak signal output means a signal provided with a spread code equal to the spread code used for generating any one of the plurality of spread spectrum signals. In some cases, the receiving apparatus is used as a receiving apparatus for spread spectrum communication with respect to the transmitting apparatus for spread spectrum communication.
And a spread spectrum communication system capable of improving the data transmission rate while satisfying the conditions specified by laws and regulations.
In this case, there is no need to change the configuration of the receiving apparatus adopted as the receiving apparatus for spread spectrum communication.

In this case, in the transmission apparatus for spread spectrum communication having the above-mentioned configuration, some of the plurality of spread spectrum modulation means are provided with:
A phase shifter for shifting the phase of the carrier used for them so as to be orthogonal to the phase of the carrier used for the other spread spectrum modulating means other than them is provided, and the phase is shifted by the phase shifter. The modulation processing may be performed using the carrier wave that has been set (claim 6).

Further, in the spread spectrum communication transmitting apparatus having the above-described configuration, some of the plurality of spread spectrum modulating means may be provided with a determining means for determining a value of the information signal, A first spread code output means for outputting a spread code of the second spread code, and a second spread code in which the polarity of the circulated code in the first spread code output from the first spread code output means is inverted to a second spread code. And a second spreading code output means for outputting as a spreading code, when the determining means determines that the value of the information signal to be used for the modulation process is equal to the value of the information signal used for the immediately preceding modulation process. And selecting, as the spreading code to be used for the modulation process, the one of the first spreading code and the second spreading code that is equal to the spreading code used for the immediately preceding modulation process. When the means determines that the value of the information signal to be used for the modulation process is different from the value of the information signal used for the immediately preceding modulation process, the first spreading code and the second spreading code are used as the spreading codes to be used for the modulation process. A configuration may be adopted in which one of the spread codes different from the spread code used for the immediately preceding modulation process is selected (claim 7).

[0044]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, in FIG. 1 showing the overall configuration, a spread spectrum communication system 51 includes a transmission device 61 for spread spectrum communication and a reception device 81 for spread spectrum communication.
The transmitting device 61 for spread spectrum communication includes a serial-parallel converter 62 and a plurality (six) as spread spectrum modulation means.
, Spread spectrum modulators (SS modulators) 63 to 68, a carrier generator 69, and an adder 70 as an adding means.

The serial-parallel converter 62 transmits the transmission data TxD
Are given as serial data. When the transmission data TxD is given, the transmission data TxD is converted from serial to parallel in 6-bit units as described later in detail, and the parallel transmission data TxDa to TxDf ( Information signal in the present invention)
, And outputs the parallel transmission data TxDa to TxDf to the spread spectrum modulators 63 to 68, respectively.

As shown in FIG. 2, each of the spread spectrum modulators 63 to 68 includes a PN code generation circuit 71, a binary sum circuit 72, and a phase modulation circuit (PSK modulation circuit) 73. Has the same configuration as the other components, and therefore, the spread spectrum modulator 63 will be described as a representative.

The PN code generation circuit 71 of the spread spectrum modulator 63 outputs a PN code PNa as a spread code. In this case, the PN code PNa has good autocorrelation characteristics, that is, has a sharp peak at a synchronization point (phase difference 0), and has a sufficient absolute value at other points (points other than the synchronization point). Small, spreading factor (code length) is 1
Two chips, and the arrangement pattern is PNa = (1,1,1,1,1, -1, -1,1,1, -1,1, -1).

The binary sum circuit 7 of the spread spectrum modulator 63
2 is the parallel transmission data Tx from the serial-parallel converter 62.
When Da is given and the PN code PNa is given from the PN code generating circuit 71, P is given by the parallel transmission data TxDa.
By modulating (spreading) the N code PNa,
The modulation signal Pa is generated and output.

The phase modulation circuit 73 of the spread spectrum modulator 63 receives the modulation signal Pa from the binary sum circuit 72 and the carrier wave f from the carrier generator 69.
Is given, the carrier f is modulated by the modulation signal Pa by the two-phase modulation method to generate and output the spread spectrum signal Sa.

Thus, the spread spectrum modulator 63
When the parallel transmission data TxDa is given from the serial-parallel converter 62, the PN code PNa is modulated (spread) by the parallel transmission data TxDa to generate a modulated signal Pa, and the modulated signal Pa is used to generate a carrier wave f. Is subjected to a modulation process by a two-phase modulation method to generate and output a spread spectrum signal Sa.

The spread spectrum modulators 64 to 68 will be described below.
Are similarly connected to the serial-parallel converters 62, respectively.
Are supplied with the parallel transmission data TxDb to TxDf, the parallel transmission data TxDb to TxDf modulates (spreads) the PN codes PNb to PNf to generate modulation signals Pb to Pf, and generates the modulation signals Pb to Pf. By modulating the carrier f with the two-phase modulation method using Pf, the spread spectrum signals Sb to Sf are generated and output.

Here, spread spectrum modulators 64-68
Have the following relationships with the PN codes PNa used in the spread spectrum modulator 63.

That is, the PN code PNb used in the spread spectrum modulator 64 is different from the PN code PNa used in the spread spectrum modulator 63 by the “1” of the eleventh chip and the twelfth chip in the PN code PNa. The array pattern is generated so as to be an array pattern in which two chips of “−1” are circulated at the head, and the array pattern is PNb = (1, -1,1,1,1,1,1, -1, -1) , -1, 1, 1, -1).

The PN code PNc used in the spread spectrum modulator 65 is different from the PN code PNa by its PN code.
The code PNa is generated so as to form an array pattern in which four chips of “1” of the ninth chip to “−1” of the twelfth chip in the code PNa are circulated first, and the array pattern is PNc = (1, -1, 1, -1, 1, 1, 1, 1, 1, -1, -1, 1).

The PN code PNd used in the spread spectrum modulator 66 is different from the PN code PNa by its PN code.
The code PNa is generated so as to form an array pattern in which six chips of “−1” of the seventh chip to “−1” of the twelfth chip in the code PNa are circulated first, and the array pattern is PNd = (−− 1, 1, 1, -1, 1, -1, 1, 1, 1, 1, 1, -1).

The PN code PNe used in the spread spectrum modulator 67 is different from the PN code PNa with respect to the PN code PNa.
The code PNa is generated so as to form an array pattern in which eight chips of “1” of the fifth chip to “−1” of the twelfth chip in the code PNa are circulated first, and the array pattern is PNe = (1, -1, -1, 1, 1, -1, 1, -1, 1, 1, 1, 1).

Further, the PN code PNf used in the spread spectrum modulator 68 is the same as the PN code PNf.
An N-code PNf is generated so as to form an array pattern in which ten chips from “1” of the third chip to “−1” of the twelfth chip are circulated at the top. The array pattern is PNf = (1 , 1, 1, -1, -1, 1, 1, -1, 1, -1, 1, 1).

The adder 70 outputs the spread spectrum signals Sa to Sf from the spread spectrum modulators 63 to 68 described above.
Is given, a transmission signal S 1 is generated by adding the spread spectrum signals Sa to Sf, and the transmission signal S 1 is transmitted by the antenna 74.

The transmitting apparatus 61 for spread spectrum communication converts the transmission data TxD from serial to parallel to generate parallel transmission data TxDa to TxDf, and generates the parallel transmission data TxDa.
TxDf modulates (spreads) the PN codes PNa to PNf to generate modulated signals Pa to Pf, and modulates the carrier f with the modulated signals Pa to Pf by a two-phase modulation method to generate a spread spectrum signal Sa. ~ Sf and generate their spread spectrum signals
It is configured to add and process Sa to Sf to generate and transmit a transmission signal S.

On the other hand, the spread spectrum communication receiving device 81 is composed of one spread spectrum demodulator (SS demodulator) 82 as correlation peak signal output means, information signal generation means, and delay detection means. The spread spectrum demodulator 82 includes a matched filter 83 and a phase detector 84 as shown in FIG. Next, specific configurations of the matched filter 83 and the phase detector 84 will be described in detail with reference to FIG.

The matched filter 83 mainly includes a surface acoustic wave element (hereinafter abbreviated as a SAW element) 85, and an input electrode 86 and an output electrode 87 are formed on the surface of the SAW element 85. It is formed at a predetermined interval.

The input electrode 86 of the matched filter 83
Is composed of twelve pairs of interdigital electrodes, and the electrode patterns of the twelve pairs of interdigital electrodes are arranged in a one-period array of the PN code PNa used in the spread spectrum modulator 63 of the spread spectrum communication transmitter 61. It is formed to match the pattern. Then, in this case, the transmission signal S transmitted from the transmission apparatus 61 for spread spectrum communication is transmitted.
Is received as a reception signal S by an antenna 88 (see FIG. 1), and when the reception signal S is applied to an input electrode 86 via an amplifier (Amp) 89, the arrangement pattern of the reception signal S and the electrode of the input electrode 86 When the pattern matches, a surface acoustic wave propagates from the input electrode 86 to the output electrode 87.

The output electrode 8 of the matched filter 83
Reference numeral 7 denotes a pair of interdigital electrodes,
Thus, when a surface acoustic wave is given as described above, a correlation peak signal is output.

The phase detector 84 is mainly composed of a SAW element 90. On the surface of the SAW element 90, an input electrode 91 and an output electrode 92 are formed at a predetermined interval. .

The input electrode 91 of the phase detector 84 comprises a pair of interdigital electrodes.
Are connected to the output electrode 87 of And in this case,
When the correlation peak signal output from the output electrode 87 of the matched filter 83 is applied to the input electrode 91, a surface acoustic wave propagates from the input electrode 91 to the output electrode 92.

The output electrode 92 of the phase detector 84 is
When a surface acoustic wave is provided from the input electrode 91 as described above, a correlation peak signal is output.

The output electrode 87 of the matched filter 83
And the timing at which the correlation peak signal is output from the output electrode 92 of the phase detector 84 corresponds to one period of the PN code PNa. Matched filter 8
When the correlation peak signal is output from the output electrode 87 of the phase detector 84, a time corresponding to one cycle of the PN code PNa elapses from the output electrode 87 of the phase detector 84 and the output electrode 87 of the matched filter 83. The same correlation peak signal as the one output from is output.

When the correlation peak signal output from the output electrode 87 of the matched filter 83 is provided and the correlation peak signal output from the output electrode 92 is provided, the calculation circuit 93 of the phase detector 84 calculates them. (Multiplication), and the obtained operation result is converted to a low-pass filter (LP
F) 94.

When the operation result is given from the operation circuit 93, the low-pass filter 94 limits the band of the operation result to output a demodulated output having a positive or negative peak. A receiver (not shown) generates and outputs the received data RxD by determining whether the demodulated output is positive or negative.

In this case, the reception data RxD is generated as described above for the following reason. That is, the fact that the PN codes PNa to PNf are modulated by the transmission parallel data TxDa to TxDf in the spread spectrum communication transmitting apparatus 61 means that the values of the transmission parallel data TxDa to TxDf are “0” or “1”. PN code PN
This is equivalent to making the phase of the carrier wave f corresponding to one cycle of a to PNf positive or negative. Therefore, the phase information of the carrier f included in the correlation peak signal output from the output electrode 87 of the matched filter 83 and the correlation peak signal output immediately before that, that is, the output from the output electrode 92 of the phase detector 84 The demodulated output is generated by calculating the phase information of the carrier f included in the obtained correlation peak signal, and the received data RxD is generated by determining whether the demodulated output is positive or negative. . FIG. 5 schematically shows a result obtained by numerical calculation of a state in which the phase information of the carrier f is included in the correlation peak signal.

Thus, the spread spectrum communication receiving apparatus 81 receives the transmission signal S transmitted from the spread spectrum communication transmitting apparatus 61 and demodulates (despreads) the transmission signal S, thereby receiving the signal. It is configured to generate and output data RxD.

Next, the operation of the above configuration will be described with reference to FIGS. Now, the transmission data TxD
However, as shown in FIG. 6A, (A0, A1,..., A5, A6m, A6m + 1, A6m + 2,
.., (M is 1, 2, 3,...), And when this transmission data TxD is given to the transmission apparatus 61 for spread spectrum communication, the serial-parallel converter 62 converts the data into 6-bit units. By performing the serial-parallel conversion, parallel transmission data TxDa to TxDf are generated as shown in FIG. Specifically, the parallel transmission data TxDa is (A0, A6
, A12, A18,...), The parallel transmission data TxDb is generated as (A1, A7, A13, A19,...), And the parallel transmission data TxDc is generated as (A2, A8, A14,.
A20, ...,), and the parallel transmission data TxDd is
(A3, A9, A15, A21,...), And the parallel transmission data TxDe is (A4, A10, A16, A22,
..), And the parallel transmission data TxDf is (A5
, A11, A17, A23,...).

In this case, the parallel transmission data TxDa to Tx
Df is set such that the spreading factor of the PN codes PNa to PNf is 1 as described above.
Since it is 2 chips, the occupied bandwidth is 24 MHz, which is 26 MHz or less specified by law,
The modulation speed is 1 MBaud, that is, the data transmission speed is 1 MBaud.
It is converted to Mbit / s. And the parallel transmission data TxDa to TxDf thus converted
Are output to spread spectrum modulators 63 to 68, respectively.

When the parallel transmission data TxDa to TxDf is given to the spread spectrum modulators 63 to 68, the spread spectrum modulator 63 in the binary sum circuit 72, as shown in FIG. The PN code PNa output from the PN code generation circuit 71 is subjected to modulation processing (spreading processing) to generate and output a modulation signal Pa. In the phase modulation circuit 73, the modulation signal Pa is used to generate a carrier wave 69 Is subjected to modulation processing by the two-phase modulation method, thereby generating and outputting a spread spectrum signal Sa.

Subsequently, the spread spectrum modulators 64 to 68 similarly operate in parallel transmission data TxDa and PN
Instead of the code PNa, the parallel transmission data TxDb to Tx
By performing modulation processing (spreading processing) on the PN codes PNb to PNf by Df, modulated signals Pb to Pf are generated and output,
The carrier f is modulated by the modulated signals Pb to Pf according to a two-phase modulation method, thereby generating a spread spectrum signal.
Sb to Sf are generated and output. Then, when these spread spectrum signals Sa to Sf are provided to adder 70, they are added to generate transmission signal S 1 and transmitted from antenna 74.

In response to this, when transmission signal S transmitted from spread spectrum communication transmitting apparatus 61 is received by spread spectrum communication receiving apparatus 81 as received signal S by antenna 88, the received signal S Output to the spread demodulator 82. Then, the received signal S given to the spread spectrum demodulator 82 is a matched filter 83
, And is amplified by an amplifier 89 and applied to an input electrode 86 of the SAW element 85.

At this time, the received signal S is generated by adding the spread spectrum signals Sa to Sf as described above, and the electrode pattern of the input electrode 86 of the matched filter 83 has the spread spectrum signal. PN code used in spread spectrum modulator 63 of communication transmitter 61
Since it is formed so as to match the one-period array pattern of PNa, the array pattern of the spread spectrum signal Sa included in the received signal S matches the electrode pattern of the input electrode 86.

That is, when the arrangement pattern of the spread spectrum signal Sa included in the received signal S matches the electrode pattern of the input electrode 86, the input electrode 86 changes to the output electrode 87.
The surface acoustic wave propagates toward the output electrode 87 from FIG.
A correlation peak signal as shown in FIG. When the correlation peak signal output from the output electrode 87 of the matched filter 83 is applied to the input electrode 91 of the phase detector 84, the surface acoustic wave propagates from the input electrode 91 to the output electrode 92, and the output electrode 92 7 outputs a correlation peak signal as shown in FIG. At this time, the timing at which the correlation peak signal is output from the output electrode 87 of the matched filter 83 and the output electrode 9 of the phase detector 84
The time difference from the timing at which the correlation peak signal is output from 2 corresponds to one cycle of the PN code PNa, as described above.

Next, when the correlation peak signal output from the output electrode 87 of the matched filter 83 and the correlation peak signal output from the output electrode 92 of the phase detector 84 are given to the arithmetic circuit 93, they are calculated. The obtained operation result is output to the low-pass filter 94, and a demodulated output having a positive or negative peak as shown in FIG. 7C is output from the low-pass filter 94. Then, by determining whether the demodulated output is positive or negative, reception data RxDa corresponding to the parallel transmission data TxDa is generated and output.

When the transmission signal S 1 transmitted from the spread spectrum communication transmitting apparatus 61 is received by the spread spectrum communication receiving apparatus 81 as the received signal S, the spread spectrum signal Sa included in the received signal S 2 is transmitted. The received data RxDa is demodulated and generated and output.

Here, consider other spread spectrum signals Sb to Sf except for spread spectrum signal Sa included in received signal S. The PN codes PNb to PNf used in generating these spread spectrum signals Sb to Sf are:
As described above, for each PN code PNa, the PN code
This is an arrangement pattern in which a predetermined number of chips in the code PNa are circulated at the head. Therefore, the arrangement pattern of the PN codes PNb to PNf is the PN code PNa
That is, the arrangement pattern of the spread spectrum signals Sb to Sf generated by modulating the carrier f with the PN codes PNb to PNf also corresponds to the arrangement pattern of the PN code PNa. Partially matched.

Specifically, the PN code PNb is the PN code PN
a is an array pattern in which two chips of “1” of the eleventh chip and “−1” of the twelfth chip in the PN code PNa are circulated at the head, so that 1 of the PN code PNb is
In the cycle, "1" on the 3rd chip to "-" on the 12th chip
The ten chips of “1” correspond to the ten chips of “1” of the first chip and “−1” of the tenth chip which have not been circulated in one cycle of the PN code PNa. The electrode pattern matches the electrode pattern from the first pair (the left end side in FIG. 4) of the 12 pairs of interdigital electrodes of the input electrode 86 of the filter 83 to the tenth interdigital electrode.

When the received signal S is supplied to the matched filter 83, the third chip of the array pattern corresponding to one period of the PN code PNb in the spread spectrum signal Sb contained in the received signal S The tenth to twelfth chips are the input electrodes 8 of the matched filter 83.
The first and sixth pairs of the electrode patterns are matched with each other. Then, when they match, the input electrode 86
The surface acoustic wave propagates from the output electrode 87 to the output electrode 87, a correlation peak signal as shown in FIG. 8A is output from the output electrode 87 of the matched filter 83, and is output from the output electrode 87 of the matched filter 83. When the correlated peak signal is applied to the input electrode 91 of the phase detector 84, a surface acoustic wave propagates from the input electrode 91 toward the output electrode 92, and the correlation peak signal from the output electrode 92 as shown in FIG. A signal is output.

Next, when the correlation peak signal output from the output electrode 87 of the matched filter 83 and the correlation peak signal output from the output electrode 92 of the phase detector 84 are given to the arithmetic circuit 93, they are calculated. The obtained operation result is output to the low-pass filter 94, and the low-pass filter 94 outputs a demodulated output having a positive or negative peak as shown in FIG. Then, by determining whether the demodulated output is positive or negative, received data RxDb corresponding to the parallel transmission data TxDb is generated and output.

In this case, the PN code PNb is, as described above, 10 chips of the third chip “1” to the twelfth chip “−1” with respect to the 12 chips of the PN code PNa, as described above. Since the electrode pattern partially matches the electrode pattern of the input electrode 86 of the input signal
The correlation peak signal output in response to Sb is output after being delayed by two chips from the correlation peak signal output in response to the spread spectrum signal Sa, and its intensity is equal to the spread spectrum signal Sa. The intensity of the correlation peak signal correspondingly output is about 10/12, and the portion not output as the correlation peak signal is output as noise in terms of energy conservation. In FIG. 8, noise is omitted.

As described above, when the received signal S is given to the matched filter 83, the received signal S contains only two spread spectrum signals, for example, the spread spectrum signal Sa and the spread spectrum signal Sb. As shown in FIG. 9, the output electrode 87 of the matched filter 83
A correlation peak signal as shown in FIG. 9A is output, and a correlation peak signal as shown in FIG. 9B is output from the output electrode 92 of the phase detector 84.
A demodulated output as shown in FIG. 9C is output, and the positive / negative judgment of the demodulated output is made to generate and output the received data RxDa, RxDb corresponding to the parallel transmission data TxDa, TxDb. It is.

Hereinafter, also for the PN codes PNc to PNf, P
Since the relationship is similar to the N code PNa, the PN codes PNc to PNf will be described below.

As described above, the PN code PNc is such that the ninth chip “1” to the twelfth chip “−1” in the PN code PNa are circulated at the head of the PN code PNa. Because of the arrangement pattern, the eight chips “1” of the fifth chip to “1” of the twelfth chip in one cycle of the PN code PNc are not cycled in one cycle of the PN code PNa. "1" on the chip to "
This corresponds to the eight chips of “1”, which are the electrodes from the first pair of interdigital electrodes to the eighth pair of interdigital electrodes among the 12 pairs of interdigital electrodes in the input electrode 86 of the matched filter 83. It matches the pattern.

When the received signal S is supplied to the matched filter 83, the fifth chip of the array pattern corresponding to one period of the PN code PNc in the spread spectrum signal Sc included in the received signal S The eighth to twelfth chips are the input electrodes 86 of the matched filter 83.
, And when they match, a correlation peak signal is output from the output electrode 87 of the matched filter 83 and the correlation peak signal is output from the output electrode 92 of the phase detector 84. A peak signal is output. Then, by calculating the correlation peak signals, a demodulated output is generated and output, and by determining whether the demodulated output is positive or negative, the parallel transmission data is obtained.
Parallel reception data RxDc corresponding to TxDc is generated and output.

In this case, the correlation peak signal output corresponding to the spread spectrum signal Sc is output after being delayed by 4 chips from the correlation peak signal output corresponding to the spread spectrum signal Sa. And its strength is
The intensity of the correlation peak signal output corresponding to the spread spectrum signal Sa is about 8/12, and the portion not output as the correlation peak signal is output as noise from the viewpoint of energy conservation.

The PN code PNd is, as described above,
Since the PN code PNa is an array pattern in which six chips of “−1” of the seventh chip to “−1” of the twelfth chip in the PN code PNa are arranged at the top, the PN code PNa
Six chips of "1" of the seventh chip and "-1" of the twelfth chip in one cycle of PNd are "1" to "6" of first chips which are not circulated in one cycle of PN code PNa. This corresponds to the six chips of “−1” of the chip, which corresponds to the sixth intersecting finger electrode of the 12 pairs of interdigital electrodes in the input electrode 86 of the matched filter 83. This matches the electrode pattern of the finger electrodes.

When the received signal S is supplied to the matched filter 83, the seventh chip of the array pattern corresponding to one cycle of the PN code PNd in the spread spectrum signal Sd included in the received signal S Sixth to twelfth chips are input electrodes 86 of the matched filter 83.
, The correlation peak signal is output from the output electrode 87 of the matched filter 83, and the correlation peak signal is output from the output electrode 92 of the phase detector 84 when they match. A peak signal is output. Then, by calculating the correlation peak signals, a demodulated output is generated and output, and by determining whether the demodulated output is positive or negative, the parallel transmission data is obtained.
Parallel reception data RxDd corresponding to TxDd is generated and output.

In this case, the correlation peak signal output corresponding to the spread spectrum signal Sd is output after being delayed by 6 chips from the correlation peak signal output corresponding to the spread spectrum signal Sa. And its strength is
The intensity of the correlation peak signal output corresponding to the spread spectrum signal Sa is about 6/12, and the portion not output as the correlation peak signal is output as noise from the viewpoint of energy conservation.

Further, the PN code PNe is, as described above,
Since the PN code PNa is an array pattern in which eight chips of “1” of the fifth chip to “−1” of the twelfth chip in the PN code PNa are circulated at the top, the PN code PNa
The four chips of “1” of the ninth chip to “1” of the twelfth chip in one cycle of PNe are the “1” to fourth chips of the first chip that are not circulated in one cycle of the PN code PNa. This corresponds to four chips of “1” of the eye, which are the first to fourth interdigital electrodes of the 12 pairs of interdigital electrodes in the input electrode 86 of the matched filter 83. This corresponds to the electrode pattern up to.

When the received signal S is given to the matched filter 83, the ninth chip of the array pattern corresponding to one period of the PN code PNe in the spread spectrum signal Se included in the received signal S is The fourth to twelfth chips are the input electrodes 86 of the matched filter 83.
, And a correlation peak signal is output from the output electrode 87 of the matched filter 83, and a correlation peak signal is output from the output electrode 92 of the phase detector 84 when they match. A peak signal is output. Then, by calculating the correlation peak signals, a demodulated output is generated and output, and by determining whether the demodulated output is positive or negative, the parallel transmission data is obtained.
Parallel reception data RxDe corresponding to TxDe is generated and output.

In this case, the correlation peak signal output corresponding to the spread spectrum signal Se is output after being delayed by 8 chips from the correlation peak signal output corresponding to the spread spectrum signal Sa. And its strength is
The intensity of the correlation peak signal output corresponding to the spread spectrum signal Sa is about 4/12, and the portion not output as the correlation peak signal is output as noise in terms of energy conservation.

As described above, the PN code PNf is such that, from the PN code PNa, the tenth chip from the third chip “1” to the twelfth chip “−1” in the PN code PNa is circulated first. Since the sequence pattern is
"1", 1 of the eleventh chip in one cycle of N code PNf
The two chips of “1” of the second chip correspond to the two chips of “1” of the first chip and “1” of the second chip which are not circulated in one cycle of the PN code PNa, This corresponds to 12 at the input electrode 86 of the matched filter 83.
This matches the electrode pattern from the first pair of interdigital electrodes to the second pair of interdigital electrodes.

When the received signal S is given to the matched filter 83, the spread signal Sf included in the received signal S contains 11 chips out of an array pattern corresponding to one cycle of the PN code PNf. The two chips of the first and twelfth chips match the first and second pairs of electrode patterns of the input electrode 86 of the matched filter 83, and when they match, the matched filter 83
The correlation peak signal is output from the output electrode 87 of the phase detector 84, and the correlation peak signal is output from the output electrode 92 of the phase detector 84. Then, by calculating the correlation peak signals, a demodulated output is generated and output, and by determining whether the demodulated output is positive or negative, the parallel transmission data is obtained.
Parallel reception data RxDf corresponding to TxDf is generated and output.

In this case, the correlation peak signal output corresponding to the spread spectrum signal Sf is 10 times smaller than the correlation peak signal output corresponding to the spread spectrum signal Sa.
The signal is output after being delayed by the amount of the chip, and its intensity is about 2/12 of the intensity of the correlation peak signal output corresponding to the spread spectrum signal Sa. In terms of preservation,
It is output as noise.

As described above, in the spread spectrum communication system 51, the spread spectrum communication transmitting device 61 adds six spread spectrum signals Sa to Sf to transmit a transmission signal S, and the transmission signal S is transmitted. When the signal S is received by the spread spectrum communication receiving apparatus 81 as a received signal S and applied to the matched filter 83, a correlation peak signal as shown in FIG. 10A is output from the output electrode 87 of the matched filter 83. After a period of time corresponding to one cycle of the PN code PNa has elapsed, the same correlation peak signal as that output from the output electrode 87 of the matched filter 83 is output from the output electrode 92 of the phase detector 84. , As shown in FIG. 10 (b).

Then, by calculating these correlation peak signals, demodulated outputs as shown in FIG. 10 (c) are output. Parallel reception data RxDa to RxDf corresponding to data TxDa to TxDf are generated, and
By outputting the parallel reception data RxDa to RxDf in series, the reception data RxD corresponding to the transmission data TxD is output.
Is generated and output.

As described above, according to the first embodiment, in the transmitter for spread spectrum communication 61, the parallel transmission data TxDa
To TxDf to modulate the PN codes PNa to PNf to produce a modulated signal Pa
To Pf, modulate the carrier f with the modulated signals Pa to Pf to generate spread spectrum signals Sa to Sf, add these spread spectrum signals Sa to Sf to generate the transmission signal S, and transmit In doing so, as the PN codes PNa to PNf, those whose arrangement patterns partially match each other are employed, and the spread spectrum communication receiving device 8 is used.
In FIG. 1, the configuration is such that the electrode pattern of the input electrode 86 of the matched filter 83 in the spread spectrum demodulator 82 matches the array pattern of the PN code PNa among the PN codes PNa to PNf. Is applied to the matched filter 83, the arrangement pattern of the spread spectrum signal Sa included in the received signal S matches the electrode pattern of the input electrode 86 of the matched filter 83, and also the spread spectrum signals Sb to Sf The arrangement pattern partially matches the electrode pattern of the input electrode 86 of the matched filter 83.

The arrangement pattern of the spread spectrum signals Sa to Sf included in the received signal S is
When the input electrode 86 matches the electrode pattern, a correlation peak signal corresponding to the degree of the match is output, and the correlation peak signals are calculated to correspond to the parallel transmission data TxDa to TxDf. The parallel reception data RxDa to RxDf are generated and output.

Therefore, in this embodiment, the carrier f is modulated with the parallel transmission data TxDa to TxDf to generate spread spectrum signals Sa to Sf, and the spread spectrum signals Sa to Sf are generated.
In addition, when generating and transmitting the transmission signal S, the occupied bandwidth of the transmission signal S depends on the occupancy of each of the spread spectrum signals Sa to Sf because no signal of a new frequency is generated in the addition processing. The bandwidth is 24 MHz, which is equal to the bandwidth, and the data transmission rate of the transmission signal S is 6.0 Mbit / s, which is the sum of the data transmission rates 1.0 Mbit / s of the spread spectrum signals Sa to Sf. The data transmission speed can be improved while satisfying the conditions.

Also, the spread spectrum communication receiving device 81
, A plurality of PN codes
Since it is sufficient to prepare an electrode pattern that matches the array pattern of only the PN code PNa of PNa to PNf, an electrode pattern that matches each of the array patterns of the plurality of PN codes PNa to PNf is prepared, unlike the related art. Therefore, not only the spread spectrum communication receiving apparatus 81 but also the spread spectrum communication system can be simplified, the size can be reduced, and the cost can be further reduced. Reduction can be achieved.

Particularly, in this case, the spread spectrum signal Sa
To Sf are output after being delayed by two chips at a time, and the parallel reception data RxDa to RxDf are output in series corresponding to the correlation peak signals. The parallel-to-serial converter, which was required in the configuration described above, can be eliminated, and the configuration can be further simplified not only as the spread spectrum communication receiving apparatus 81 but also as the spread spectrum communication system 51. It is possible to reduce the size, and further, to reduce the cost.

In generating the parallel received data RxDa to RxDf from the spread spectrum signals Sa to Sf, delay detection is employed, and the output electrodes of the matched filter 83 are respectively corresponding to the spread spectrum signals Sa to Sf. 87 and the output electrode 92 of the phase detector 84 output a correlation peak signal, and the parallel reception data RxDa to RxDf are generated based on the two correlation peak signals. That is, each of the spread spectrum signals Sa to Sf is individually demodulated. Processed parallel received data
Since RxDa to RxDf are generated, for example, when the quality of the communication line is poor, the spread spectrum signals Sa to
By transmitting not all of Sf but only some of them, for example, only the spread spectrum signal Sa, the data transmission speed can be reduced and data transmission can be performed.

In such a case, in a normal spread spectrum communication system, it is necessary to prepare delay lines for transmission signals having different data transmission speeds in accordance with the type of data transmission speed. However, in this case, even when all of the spread spectrum signals Sa to Sf are transmitted or when only the spread spectrum signal Sa is transmitted, two correlation peaks corresponding to the spread spectrum signal Sa are obtained. Since the time difference at which the signal is output does not change at all, only one delay line corresponding to the data transmission rate of the spread spectrum signal Sa needs to be prepared, and the configuration can be simplified accordingly. .

In this way, only a delay line corresponding to the data transmission rate of the spread spectrum signal Sa, that is, a delay line having a delay time of 1.0 μs corresponding to the data transmission rate of 1 Mbit / s, may be prepared. Signals Sa to Sf
Since there is no need to prepare a delay line corresponding to the data transmission rate of the transmission signal S to which the addition processing has been performed, that is, a delay line having a delay time of 0.166... Μs corresponding to a data transmission rate of 6 Mbit / s, Electrode 86 and output electrode 87 of the matched filter 83
And the input electrode 91 in the phase detector 84
In consideration of the fact that the distance between the output electrode 92 and the output electrode 92 is proportional to the delay time, and if the delay time is extremely short, it is difficult to realize the delay time. It is.

Further, in such a delay detection, a correlation peak signal output two to six times before is used instead of a correlation peak signal output immediately before as a reference signal, that is, a delay time is increased. By the way, SA
The delay detection can be realized using the W element.

Next, a second embodiment of the present invention will be described with reference to FIG.
1 and FIG. The same portions as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Hereinafter, different portions will be described. In the second embodiment, in the spread spectrum communication system 101, the transmitter 111 for spread spectrum communication is the same as the spread spectrum modulators 64, 66 and 68 of the transmitter 61 for spread spectrum communication described in the first embodiment. Instead, spread spectrum modulators 112 to 114 are employed. As shown in FIG. 12, each of the spread spectrum modulators 112 to 114 includes a PN code generation circuit 71, a binary sum circuit 72, a phase modulation circuit 73, and a 90-degree phase shift circuit 115 as phase shift means.
, And each of them has the same configuration as the other components. Therefore, the spread spectrum modulator 112 will be described as a representative.

When the carrier f is supplied from the carrier generator 69, the 90-degree phase shift circuit 115 of the spread spectrum modulator 112 shifts the phase of the carrier f by 90 degrees, thereby changing the phase with respect to the carrier f. A carrier wave fs shifted by 90 degrees is generated and output to the phase modulation circuit 73.

The spread spectrum modulator 112
Receives the parallel transmission data TxDb from the serial-parallel converter 62, generates a modulation signal Pb by modulating (spreading) the PN code PNb with the parallel transmission data TxDb, and generates the modulation signal Pb. 90 phase with respect to carrier f
The carrier wave fs phase-shifted is modulated by a two-phase modulation method to generate and output a spread spectrum signal Sbs.

Hereinafter, spread spectrum modulators 113 and 11 will be described.
4 is a serial-to-parallel converter 6
2, when the parallel transmission data TxDd and TxDf are given, the PN codes PNd and PNf are subjected to modulation processing (spreading processing) by the parallel transmission data TxDd and TxDf, thereby obtaining modulated signals Pd and Pf.
, And modulates the carrier fs, whose phase is shifted by 90 degrees with respect to the carrier f with the modulated signals Pd and Pf, by a two-phase modulation method, thereby obtaining a spread spectrum signal Sds
, Sfs is generated and output. Accordingly, the spread spectrum signals Sbs, Sds and Sfs output from the spread spectrum modulators 112 to 114 are phase-shifted with respect to the spread spectrum signals Sa, Sc and Se output from the spread spectrum modulators 63, 65 and 67. Is 9
The phase is shifted by 0 degrees.

As described above, according to the second embodiment, the same operation and effect as those of the above-described first embodiment can be obtained, and the spread spectrum communication transmitting apparatus 111 transmits the spread spectrum signals Sa, Sc, and Se to each other. , The spread spectrum signals Sbs, Sds and Sfs are generated such that their phases are shifted by 90 degrees, so that the spread spectrum communication receiving apparatus 81 converts these spread spectrum signals Sa, Sc and Se into The degree of separation between the correlation peak signal output correspondingly and the correlation peak signal output corresponding to the spread spectrum signals Sbs, Sds and Sfs, that is, the degree of separation between adjacently output correlation peak signals. Therefore, the accuracy of the demodulation process can be improved.

Next, a third embodiment of the present invention will be described with reference to FIG.
3 and FIG. The same portions as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Hereinafter, different portions will be described. In the third embodiment, the transmitter 131 for spread spectrum communication in the spread spectrum communication system 121 replaces the spread spectrum modulators 64 to 68 of the transmitter 61 for spread spectrum communication described in the first embodiment. And the spread spectrum modulator 13
2 to 136 are employed. Spread spectrum modulator 1
As shown in FIG. 14, reference numerals 32 to 136 denote PN code generating circuits 137 as first spreading code output means and PN code generating circuits 13 as second spreading code output means.
8. Register 139 as determination means, determination circuit 14
0, a changeover switch 141, a binary sum circuit 72, and a phase modulation circuit 73, all of which have the same configuration as the other components.
Will be described as a representative.

The PN code generation circuit 137 of the spread spectrum modulator 132 corresponds to the PN code generation circuit 71 described in the first embodiment and outputs a PN code PNb. At this time, the arrangement pattern of the PN code PNb is, as described above, PNb = (1, -1,1,1,1,1,1, -1, -1,1,1, -1). I have.

The PN code generation circuit 138 of the spread spectrum modulator 132 responds to the PN code PNb output from the PN code generation circuit 137 with “1” of the first chip from the top of the PN code PNb that is circulated. , PN code PNbr in which the polarity of two chips of “−1” of the second chip is inverted. At this time, the arrangement pattern of the PN code PNbr is PNbr = (-1, 1, 1, 1, 1, 1, 1, -1, -1, 1, 1, -1).

Register 1 of spread spectrum modulator 132
39 is the parallel transmission data TxDb from the serial-parallel converter 62.
Is given, the value of the parallel transmission data TxDb is stored and held, and the value of the parallel transmission data TxDb is compared with the value of the parallel transmission data TxDb given from the serial-parallel converter 62 immediately before. , And outputs the comparison result.

Specifically, the register 139 stores the value of the parallel transmission data TxDb given from the serial-parallel converter 62 and the value of the parallel transmission data TxDb given immediately before the serial-parallel converter 62. Are equal to each other, an equivalent signal is output as the comparison result, and the value of the parallel transmission data TxDb given from the serial-parallel converter 62 and the parallel transmission data given from the serial-parallel converter 62 immediately before are output. When the value of TxDb is a different value, a different value signal is output as a comparison result.

Determination circuit 1 of spread spectrum modulator 132
The reference numeral 40 designates an equivalent signal or a different signal as a comparison result from the register 139. When the same signal is applied, a holding signal is output to the changeover switch 141, and when the different signal is applied, A changeover signal is output to the changeover switch 141.

The changeover switch 141 of the spread spectrum modulator 132 switches between a first connection state and a second connection state. In this case, when the changeover switch 141 is in the first connection state, the PN code PNb output from the PN code generation circuit 137 is supplied to the binary sum circuit 72, and the changeover switch 141 is in the second connection state. In some cases, the PN code generation circuit 1
The PN code PNbr output from 38 is supplied to a binary sum circuit 72.

When a holding signal is provided from determination circuit 140, switch 141 holds the connection state, and when a switching signal is provided from determination circuit 140, switches from the connection state to the other connection state. It is designed to be switched.

The spread spectrum modulator 132
When the changeover switch 141 is initially in the first connection state, for example, and when the same value is continuously given as the parallel transmission data TxDb, the same value signal is output from the register 139 and the holding signal is output from the determination circuit 140. Then, the changeover switch 141 is held in the connection state, that is, the first connection state. At this time, since the PN code PNb is output from the PN code generation circuit 137 to the binary sum circuit 72, the spread spectrum modulator 132 modulates (spreads) the PN code PNb with the parallel transmission data TxDb. To generate a modulated signal Pb,
By modulating the carrier f 2 with the modulated signal Pb by a two-phase modulation method, a spread spectrum signal Sb is generated and output.

On the other hand, the spread spectrum modulator 13
When a different value is continuously given as the parallel transmission data TxDb, a different value signal is output from the register 139, a switching signal is output from the determination circuit 140, and the changeover switch 141 is switched from the first connection state to the second connection state. Is switched to the connection state. At this time, the spread spectrum modulator 132 outputs the PN code PNbr of 2 from the PN code generation circuit 138.
The modulated signal Pbr is output to the sum-and-sum circuit 72, and the PN code PNbr is modulated (spread) with the parallel transmission data TxDb to generate a modulated signal Pbr. By performing modulation processing according to the method, a spread spectrum signal Sbr is generated and output.

Hereinafter, spread spectrum modulators 133 to 13 will be described.
6 are PN code generation circuits 1 in the same manner.
37, 138, a register 139, a determination circuit 140, a changeover switch 141, and the like. Each PN code generation circuit 137 outputs the PN codes PNc to PNf described in the first embodiment, and outputs each PN code. The code generation circuit 138 outputs PN codes PNcr to PNfr.

Here, spread spectrum modulators 133-1
36, the PN codes PNc to PNf output from the PN code generation circuits 137 and the PN codes PNcr to PNfr output from the PN code generation circuits 138 have the following relationships, respectively.

That is, as described in the first embodiment, the arrangement pattern of the PN code PNc output from the PN code generation circuit 137 of the spread spectrum modulator 133 is PNc = (1, -1,1,2). -1, 1, 1, 1, 1, 1, -1, -1, 1), whereas the spread spectrum modulator 1
33 PN code output from the PN code generation circuit 138
PNcr is an array pattern in which the polarity of the four chips of “1” of the first chip to “−1” of the fourth chip from the top in the PN code PNc is inverted, and PNcr = (− 1, 1, -1, 1, 1, 1, 1, 1, 1, -1, -1, 1).

Also, the PN of the spread spectrum modulator 134
As described in the first embodiment, the arrangement pattern of the PN codes PNd output from the code generation circuit 137 is PNd = (-1, 1, 1, -1, 1, -1, 1, 1, 1, 1, 1, -1), whereas the spread spectrum modulator 1
34 PN code output from the PN code generation circuit 138
PNdr is an array pattern in which the polarity of the six chips from “1” of the first chip to “−1” of the sixth chip from the top in the PN code PNd is inverted, and PNdr = (1, − 1, -1, 1, -1, 1, 1, 1, 1, 1, 1, -1).

The PN of the spread spectrum modulator 135 is
The arrangement pattern of the PN codes PNe output from the code generation circuit 137 is, as described in the first embodiment, PNe = (1, -1, -1,1,1, -1,1, -1). , 1, 1, 1, 1), whereas the spread spectrum modulator 1
35 PN code output from the PN code generation circuit 138
PNer is an array pattern in which the polarity of eight chips of “1” of the first chip to “−1” of the eighth chip from the top of the PN code PNe is inverted, and PNer = (− 1, 1, 1, -1, -1, 1, -1, 1, 1, 1, 1, 1).

Further, P of the spread spectrum modulator 136
The arrangement pattern of the PN codes PNf output from the N code generation circuit 137 is PNf = (1,1,1, -1, -1, -1,1,1, -1) as described in the first embodiment. , 1, -1, 1, 1,), whereas the spread spectrum modulator 1
36 PN code output from the PN code generation circuit 138
PNfr is an array pattern in which the polarity of 10 chips of “1” of the first chip to “1” of the 10th chip from the top in the PN code PNf is inverted, and PNfr = (− 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, 1,).

The spread spectrum modulators 133-133
136, when the changeover switch 141 is in an initial state, for example, in the first connection state, the parallel transmission data TxDc to TxDf
When the same value is continuously given, the same value signal is output from the register 139, the holding signal is output from the determination circuit 140, and the changeover switch 141 is held in the first connection state. By modulating (spreading) the PN codes PNc to PNf output from the PN code generation circuits 137 with the parallel transmission data TxDc to TxDf, modulated signals Pc to Pf are generated, and the modulated signals Pc
By performing a modulation process on the carrier f using the two-phase modulation method with .about.Pf, spread spectrum signals Sc to Sf are generated and output.

On the other hand, the spread spectrum modulator 13
When different values are successively given as the parallel transmission data TxDc to TxDf, the registers 3 to 136 output a different value signal from the register 139, output a switching signal from the determination circuit 140, and connect the changeover switch 141 to the first connection. The state is switched from the state to the second connection state, and accordingly, the parallel transmission data TxDc to TxDf modulates (spreads) the PN codes PNcr to PNfr output from the respective PN code generation circuits 138. As a result, the modulated signals Pcr to Pfr are generated, and the carrier f is modulated by the modulated signals Pcr to Pfr in a two-phase modulation scheme, whereby the spread spectrum signal Scr is generated.
~ Sfr is generated and output.

In the above, the case where the changeover switch 141 is in the first connection state as an initial state has been described.
, The switching control is performed in the opposite manner.

As described above, according to the third embodiment, the same operation and effect as those of the first embodiment can be obtained, and the parallel transmission data TxDb to TxDf can be continuously transmitted in the transmission apparatus 131 for spread spectrum communication. When the values are the same, the same spread spectrum signal Sb to Sf or Sbr to Sfr is continuously used by using the same PN code continuously.
Is generated, and when each of the parallel transmission data TxDb to TxDf has a different value continuously, successively different PN codes are used to generate different spread spectrum signals Sb to Sf or Sbr to Sfr continuously. In the spread spectrum communication receiver 81,
The degree of separation between correlation peak signals output corresponding to these spread spectrum signals Sb to Sf or Sbr to Sfr can be increased, thereby improving the accuracy of demodulation processing.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
5 and FIG. The same portions as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Hereinafter, different portions will be described. In the fourth embodiment, in the spread spectrum communication system 141, the transmitter 151 for spread spectrum communication is the same as the spread spectrum modulators 64, 66 and 68 of the transmitter 61 for spread spectrum communication described in the first embodiment. Are replaced with the spread spectrum modulators 152 to 154, and the spread spectrum modulators 65 and 67 are replaced with the third
Spread spectrum modulators 133 and 1 described in the embodiment
35 are adopted.

The spread spectrum modulators 152 to 154
As shown in FIG. 16, in addition to the binary sum circuit 72 and the phase modulation circuit 73, 90
The phase shift circuit 115 and the PN code generating circuits 137 and 138, the register 139, the determination circuit 140, and the changeover switch 141 described in the third embodiment are provided.

The spread spectrum modulators 152 to 152
154, when the changeover switch 141 is in the first connection state as an initial state, for example, the parallel transmission data TxDb, TxDd
When the same value is continuously given as TxDf and TxDf, the register 139 outputs the same value signal, the determination circuit 140 outputs a holding signal, and the changeover switch 141 is held in the first connection state. At this time, since the PN codes PNb, PNd, and PNf are output from the PN code generation circuit 137 to the binary sum circuit 72, the spread spectrum modulators 152 to 154 transmit the parallel transmission data TxD.
b, TxDd and TxDf modulate (spread) the PN code PNb, PNd and PNf to obtain a modulated signal Pb,
Pd and Pf are generated, and the carrier fs whose phase is shifted by 90 degrees with respect to the carrier f with the modulated signals Pb, Pd and Pf is 2
The spread spectrum signals Sbs, Sds and Sfs are generated and output by performing a modulation process according to the phase and phase modulation method.

On the other hand, the spread spectrum modulator 15
When different values are successively given as the parallel transmission data TxDb, TxDd and TxDf, the registers 2 to 154 output a different value signal from the register 139, output a switch signal from the determination circuit 140, and set the switch 141 to the first switch. The connection state is switched from the connection state to the second connection state. At this time, since the PN codes PNbr, PNdr, and PNfr are output from the PN code generation circuit 138 to the binary sum circuit 72, the spread spectrum modulators 152 to 154 generate the parallel transmission data TxDb, TxDd, and TxDf. PN code PNbr, PNdr and PN
By modulating (spreading) fr, the modulated signal
Pbr, Pdr and Pfr are generated, and their modulated signals Pbr, Pbr
The carrier fs whose phase is shifted by 90 degrees with respect to the carrier f by Pdr and Pfr is subjected to a modulation process by a two-phase modulation scheme, thereby obtaining spread spectrum signals Sbrs, Sdrs and Sfrs.
Is generated and output.

In the above, the case where the changeover switch 141 is in the first connection state as an initial state has been described. In this case, as in the third embodiment, the changeover switch 141 is set to the first connection state. When it is in the second connection state as an initial state, the opposite switching control is performed.

As described above, according to the fourth embodiment, the same operation and effect as those of the first embodiment can be obtained, and the spread spectrum communication transmitting apparatus 151 can transmit the spread spectrum signals Sa, Sc, Scr, Se and Ser and spread spectrum signals Sbs, Sbrs, Sds, Sdrs, Sfs and Sf
and rs are generated such that their phases are shifted by 90 degrees, so that the spread spectrum communication receiving device 81
In these, these spread spectrum signals Sa, Sc, Scr, Se
And the correlation peak signal output corresponding to Ser and the spread spectrum signals Sbs, Sbrs, Sds, Sdrs, Sfs and
Degree of separation from the correlation peak signal output corresponding to Sfrs,
That is, the degree of separation between adjacently output correlation peak signals can be increased, and the same operation and effect as in the second embodiment can be obtained.

Further, the transmitting apparatus 15 for spread spectrum communication
1, when the parallel transmission data TxDb to TxDf have the same value continuously, by using the same PN code continuously, the same spread spectrum signals Sbs, Sc,
Sds, Se, Sfs or Sbrs, Scr, Sdrs, Ser, Sfrs
Is generated, and when each of the parallel transmission data TxDb to TxDf has a different value continuously, by using successively different PN codes, successively different spread spectrum signals Sbs, Sc, Sds, Se, Sfs Or Sbrs, Scr, Sdr
Since s, Ser, and Sfrs are configured to be generated, the spread-spectrum communication receiver 81 receives these spread-spectrum signals Sbs, Sc, Sds, Se, Sfs, or Sbrs,
The degree of separation between the correlation peak signals output corresponding to Scr, Sdrs, Ser, and Sfrs can be increased.
The same operation and effect as the embodiment can be obtained.

The present invention is not limited to the above embodiment, but can be modified or expanded as follows. The spread spectrum modulator uses PN for parallel transmission data.
It is not limited to a configuration that modulates a code to generate a modulation signal, modulates a carrier with the modulation signal to generate a spread spectrum signal, but also modulates a carrier with a PN code to generate a modulation signal and performs parallel transmission. A configuration may be employed in which the modulated signal is modulated with data to generate a spread spectrum signal.

The number of spread spectrum modulators is not limited to six, but may be another number such as eight. P
The N code does not have to have a spreading factor of 12 chips, but may have another spreading factor such as 10 chips. In the case of a plurality of PN codes, they have two spreading factors in one cycle. Not only are the chips in a reciprocal relationship,
For example, the relationship may be such that one chip in one cycle is circulated.

[0145]

As apparent from the above description, according to the spread spectrum communication system of the first aspect, in the transmitter for spread spectrum communication, the information signal, the spread code and the carrier are used by the spread spectrum modulation means. A spread spectrum signal is generated by the modulation process, and the spread pattern is added and processed by the adding means to generate and transmit the transmission signal. The one that partially matches the
In the spread spectrum communication receiver, the correlation peak signal output means outputs the correlation peak signal when the received signal matches a spread code used for any one of the plurality of spread spectrum modulation means. When the transmission signal is provided to the correlation peak signal output means as a reception signal, the arrangement pattern of all the spread spectrum signals included in the reception signal is included in the plurality of spread spectrum modulation means. It will partially match the spread code used for any of the spread spectrum modulation means. Then, when they match, a correlation peak signal corresponding to the degree of matching is output, and an information signal is generated by the information signal generation means based on the correlation peak signal.

Accordingly, in this apparatus, when a plurality of spread spectrum signals are added and a transmission signal is generated and transmitted, the occupied bandwidth of the transmission signal is such that no signal of a new frequency is generated by the addition processing. From that
Equal to the occupied bandwidth of each spread spectrum signal, and the data transmission rate of the transmission signal is the sum of the data transmission rates of each spread spectrum signal. Can be planned.

At this time, as the correlation peak signal output means, at least one having a spread code equal to the spread code used for generating any one of the plurality of spread spectrum signals is used.
Since it is sufficient to prepare the same, not only as a receiver for spread spectrum communication, but also as a spread spectrum communication system,
The structure can be simplified, the size can be reduced, and the cost can be reduced.

According to the spread spectrum communication system of the second aspect, in the transmitter for spread spectrum communication,
In generating and transmitting a plurality of spread spectrum signals, the phase shift means shifts the phases of some spread spectrum signals so as to be orthogonal to the phases of the other spread spectrum signals. With this configuration, in the spread spectrum communication receiving apparatus, the correlation peak signal output corresponding to the phase-shifted spread spectrum signal and the correlation peak signal output corresponding to the phase-shifted spread spectrum signal are output. The degree of separation from the correlation peak signal can be increased, and the accuracy of demodulation processing can be improved.

According to the spread spectrum communication system of the third aspect, in the transmitter for spread spectrum communication,
When the information signals are continuously the same value, the same spread spectrum signal is continuously generated by using the same spreading code, and when the information signals are continuously different values, the information signals are continuously generated. Since different spread-spectrum signals are successively generated by using different spread-spectrum signals, the spread-spectrum communication receiver separates correlation peak signals output corresponding to these spread-spectrum signals. And the accuracy of the demodulation process can be improved.

According to the spread spectrum communication system of the present invention, since the correlation peak signal output means and the information signal generation means are constituted by the delay detection means, each spread spectrum signal is individually demodulated to generate an information signal. Become, for example, when the quality of the communication line is inferior, instead of transmitting all of the plurality of spread spectrum signals, by transmitting some of them,
Data transmission can be performed with a reduced data transmission speed.

In such a case, in a normal spread spectrum communication system, it is necessary to prepare delay lines for transmission signals having different data transmission speeds in accordance with the type of data transmission speed. However, in this case, even when a plurality of spread spectrum signals are all transmitted,
Even when some of the signals are transmitted, focusing on one spread spectrum signal, the time difference at which the correlation peak signal corresponding to the spread spectrum signal is output does not change at all. Only the one corresponding to the data transmission rate of the one spread spectrum signal needs to be prepared, and the configuration can be simplified accordingly.

Further, only the delay line corresponding to the data transmission rate of one spread spectrum signal may be prepared, and the delay line corresponding to the data transmission rate of the transmission signal obtained by adding the plurality of spread spectrum signals is processed. It is not necessary to prepare a surface acoustic wave element (SA
In the case of employing a W element, the distance between the input electrode and the output electrode formed on the surface acoustic wave element is proportional to the delay time. Considering that, it can be easily realized.

According to the transmitting apparatus for spread spectrum communication of the fifth aspect, the spread spectrum modulating means generates a spread spectrum signal by performing modulation processing using the information signal, the spreading code and the carrier, and the adding means. In generating and transmitting a transmission signal by adding these spread spectrum signals, a code whose arrangement pattern partially matches each other is used as the spread code. When there is already a receiving device having a spreading code equal to the spreading code used in generating any of the signals as a correlation peak signal output means, the transmitting device for the spread spectrum communication is used. The receiver is used as a receiver for spread spectrum communication. By, as described in any one of claims 1 to 4, while satisfying the specified conditions the law, it is possible to construct a spread spectrum communication system which can improve the data transmission speed. In this case, there is no need to change the configuration of the receiving apparatus adopted as the receiving apparatus for spread spectrum communication.

According to the transmitting apparatus for spread spectrum communication of the sixth aspect, when generating and transmitting a plurality of spread spectrum signals, the phase of some spread spectrum signals is removed by the phase shift means. 3. A spread spectrum communication system according to claim 2, wherein the phase spread signal is shifted so as to be orthogonal to the phase of another spread spectrum signal. The same operation and effect as described above can be obtained.

According to the transmitting apparatus for spread spectrum communication of the present invention, when the information signals are continuously the same, the same spread spectrum signal is continuously generated by using the same spreading code continuously. In addition, when the information signals are successively different values, different spread codes are used successively to generate different spread spectrum signals, so that a spread spectrum communication system is constructed. In this case, the same effect as that of the above-described claim 3 can be obtained in the receiver for spread spectrum communication.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing a spread spectrum modulator for each function.

FIG. 3 is a block diagram showing a spread spectrum demodulator for each function.

FIG. 4 is a configuration diagram of a spread spectrum demodulator;

FIG. 5 is a diagram showing a correlation peak signal.

FIG. 6 is a diagram showing transmission data and parallel transmission data.

FIG. 7 is a diagram showing an output state of a correlation peak signal and a demodulation output corresponding to a spread spectrum signal Sa;

FIG. 8 is a diagram corresponding to FIG. 7 corresponding to the spread spectrum signal Sb.

FIG. 9 is a diagram corresponding to FIG. 7 corresponding to spread spectrum signals Sa and Sb.

FIG. 10 is a diagram corresponding to FIG. 7 corresponding to spread spectrum signals Sa to Sf.

FIG. 11 is a view corresponding to FIG. 1, showing a second embodiment of the present invention.

FIG. 12 is a diagram corresponding to FIG. 2;

FIG. 13 is a view corresponding to FIG. 1, showing a third embodiment of the present invention.

FIG. 14 is a diagram corresponding to FIG. 2;

FIG. 15 is a view corresponding to FIG. 1, showing a fourth embodiment of the present invention.

FIG. 16 is a diagram corresponding to FIG. 2;

FIG. 17 is a diagram corresponding to FIG. 1 showing a conventional example.

FIG. 18 is a diagram corresponding to FIG. 2;

FIG. 19 is a diagram corresponding to FIG. 3;

[Explanation of symbols]

In the drawing, 51 is a spread spectrum communication system, 61 is a transmission device for spread spectrum communication, 63 to 68 are spread spectrum modulators (spread spectrum modulation means), 70 is an adder (addition means), and 81 is reception for spread spectrum communication. apparatus,
82 is a spread spectrum demodulator (correlation peak signal output means, information signal generation means, delay detection means), 101 is a spread spectrum communication system, 111 is a transmitter for spread spectrum communication, and 112 to 114 are spread spectrum modulators (spread spectrum modulators). Modulation means), 115 is a 90-degree phase shift circuit (phase shift means), 121 is a spread spectrum communication system,
131 is a transmitter for spread spectrum communication, 132 to 13
6 is a spread spectrum modulator (spread spectrum modulation means), 137 is a PN code generation circuit (first spread code output means), 138 is a PN code generation circuit (second spread code output means), and 139 is a register (judgment). Means, 140 is a determination circuit (determination means), 141 is a spread spectrum communication system, 151 is a transmitter for spread spectrum communication, 152
154 are spread spectrum modulators (spread spectrum modulation means).

Claims (7)

[Claims] 1. A plurality of spread spectrum modulating means for generating and outputting a spread spectrum signal by performing modulation processing using an information signal, a spread code having a predetermined spread rate (predetermined code length) and a carrier, and a plurality of spread spectrum modulation means. Adding means for adding each of the spread spectrum signals output from each of the spread modulation means and transmitting the resulting signal as a transmission signal, wherein the plurality of spread spectrum modulation means are used for any of the spread spectrum modulation means. Also for the code, the spread pattern used for the other spread spectrum modulating means so that the arrangement pattern of the spread code used for the other spread spectrum modulating means other than the code is circulated by a predetermined number of codes from the beginning or end. A transmitter for spread spectrum communication configured to have a different arrangement pattern from the code; When a transmission signal transmitted from a transmitter for spread spectrum communication is received as a reception signal and the reception signal matches a spread code used for any one of the plurality of spread spectrum modulation means. Correlation peak signal output means for outputting a correlation peak signal,
An information signal generating means for generating the information signal based on the correlation peak signal output from the correlation peak signal output means. Spread spectrum communication system. 2. Some of the plurality of spread-spectrum modulating means are arranged such that a phase of a carrier used for the plurality of spread-spectrum modulating means is different from a phase of a carrier used for other spread-spectrum modulating means. 2. The spectrum according to claim 1, further comprising: a phase shift unit that shifts the signal so as to be orthogonalized by using the carrier, and that performs a modulation process using the carrier wave whose phase is shifted by the phase shift unit. Spreading communication system. 3. Some of the plurality of spread spectrum modulation means include: a determination means for determining a value of the information signal; and a first spread code output for outputting a first spread code. Means, and a second spread code output for outputting, as a second spread code, a spread code obtained by inverting the polarity of the circulated code in the first spread code output from the first spread code output means. Means, when the determination means determines that the value of the information signal to be used for the modulation process is equal to the value of the information signal used for the immediately preceding modulation process, the first code is used as the spread code to be used for the modulation process. Of the second spreading code and the second spreading code, the one which is equal to the spreading code used for the immediately preceding modulation process, and the determination means determines the value of the information signal to be used for the modulation process and the immediately preceding variation. When it is determined that the value of the information signal used for the processing is different, the spreading code used for the immediately preceding modulation processing of the first spreading code and the second spreading code is used as the spreading code used for the modulation processing. 3. The spread spectrum communication system according to claim 1, wherein a different one is selected. 4. The spread spectrum communication system according to claim 1, wherein said correlation peak signal output means and information signal generation means are constituted by delay detection means. 5. A plurality of spread spectrum modulating means for generating and outputting a spread spectrum signal by performing modulation processing using an information signal, a spread code having a predetermined spread rate (predetermined code length) and a carrier, and a plurality of spread spectrum modulation means. Adding means for adding each of the spread spectrum signals output from each of the spread modulation means and transmitting the resultant signal as a transmission signal, wherein the plurality of spread spectrum modulation means are used for any of the spread spectrum modulation means. Also for the code, the spread pattern used for the other spread spectrum modulating means so that the arrangement pattern of the spread code used for the other spread spectrum modulating means other than the code is circulated by a predetermined number of codes from the beginning or end. A transmission pattern for spread spectrum communication, characterized in that the arrangement pattern is different from the code. Apparatus. 6. A spread spectrum modulating means of some of the plurality of spread spectrum modulating means, wherein a phase of a carrier used for the plurality of spread spectrum modulating means is different from a phase of a carrier used for other spread spectrum modulating means. 6. The spectrum according to claim 5, further comprising: a phase shift unit that shifts the signal so as to be orthogonalized, and performing a modulation process using a carrier wave whose phase is shifted by the phase shift unit. Transmitter for spread communication. 7. Some of the plurality of spread spectrum modulating means include: a judging means for judging a value of the information signal; and a first spread code output for outputting a first spread code. Means, and a second spread code output for outputting, as a second spread code, a spread code obtained by inverting the polarity of the circulated code in the first spread code output from the first spread code output means. Means, when the determination means determines that the value of the information signal to be used for the modulation process is equal to the value of the information signal used for the immediately preceding modulation process, the first code is used as the spread code to be used for the modulation process. Of the second spreading code and the second spreading code, the one which is equal to the spreading code used for the immediately preceding modulation process, and the determination means determines the value of the information signal to be used for the modulation process and the immediately preceding variation. When it is determined that the value of the information signal used for the processing is different, the spreading code used for the immediately preceding modulation processing of the first spreading code and the second spreading code is used as the spreading code used for the modulation processing. 7. The transmission apparatus for spread spectrum communication according to claim 5, wherein a different one is selected.