JPH09307477A - Spread spectrum communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the utilizing efficiency of frequencies while suppressing the increase in the hardware and to realize accurate demodulation processing by instructing generation of a spread spectrum code based on correlation detection result. SOLUTION: An instruction means 12 instructs consecutive generation of a current spread spectrum code to a generating means 10 when a detection means 11 detects coincident correlation and instructs generation of a spread spectrum code of other period pattern to the generating means 10 when a detection means 11 detects dissident correlation. An inverse spread means 13 applies inverse spread processing to a received signal by using a spread spectrum code whose timewise direction is inverted to that generated from the generating means 10. Through the adoption of the configuration of searching a spread spectrum code used for generating the received signal to receive the reception signal, the reception signal generated by using the spread spectrum code of a different period pattern is attained and the frequency utilization efficiency is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spread spectrum communication device used in spread spectrum communication, and more particularly, to a spread spectrum communication device that realizes an improvement in frequency utilization efficiency while suppressing an increase in the amount of hardware. The present invention relates to a spread spectrum communication device that realizes demodulation processing.

Recently, spread spectrum communication has come into the spotlight. In this spread spectrum communication, a carrier wave is first-modulated by transmission data and then spread using a spread spectrum code (most commonly, it has a periodicity in which one bit section of the transmission data is one cycle). Therefore, the transmission signal is generated, and high confidentiality can be exhibited because the signal cannot be received unless the spread spectrum code is known, and the influence on other electronic devices is small because the power is spread. There is.

In order to make this spread spectrum communication practical, it is necessary to construct a practical spread spectrum communication device.

[0004]

2. Description of the Related Art In conventional spread spectrum communication used for consumer use, one kind of spread spectrum code (a pseudo noise code having periodicity, usually
(Using an M-sequence cyclic code),
The transmission side uses the spread spectrum code to spread the primary modulation data to generate a transmission signal and transmits it to the reception side. When the reception side receives the signal from the transmission side, the reception side transmits the spread spectrum code. In this case, the transmission data is obtained by despreading the received signal and then demodulating it.

At this time, the receiving side uses a SAW convolver or a matched filter which receives the received signal as one input and uses the spread spectrum code whose time direction is opposite to that of the spread spectrum code on the transmitting side as the other input. Using the configuration prepared, the received signal and the spectrum prepared for despreading are displayed by using the correlation match signal detected by the SAW convolver or matched filter (displays the spread spectrum code match and the match start position). The configuration is such that despreading is executed by synchronizing with the spreading code.

[0006]

However, if the configuration is such that only one type of spread spectrum code is used on the transmitting side and the receiving side as in the prior art, only communication processing using the spread spectrum code is executed. Therefore, there is a problem that the frequency utilization efficiency is poor.

Further, as in the prior art, if the configuration is such that despreading is performed by synchronizing the received signal with the spread spectrum code by using the correlation coincidence signal detected by the SAW convolver, demodulation is performed. There is a problem in that accurate demodulation processing may not be realized due to fluctuations in the pulse width of data.

That is, since the SAW convolver inputs two input signals facing each other, in principle, two correlation coincidence signals are generated during one period of the spread spectrum code, but the timing etc. Because of this, this happens to be one shot. In the prior art, since no measures have been taken against this point, the pulse width of demodulated data may fluctuate.

Further, in order to solve the problem of poor frequency utilization efficiency of the prior art, it is conceivable to adopt a configuration using a plurality of spread spectrum codes. There will be a new problem in that

That is, in the prior art, as shown in FIG. 32, the generated spread spectrum code (PN pattern) is generated.
Since it adopts a configuration that uses a SAW convolver or a matched filter, it adopts a configuration that uses multiple spread spectrum codes in order to improve the frequency utilization efficiency, and accordingly uses a large number of SAW convolvers and a matched filter. It becomes necessary to increase the amount of hardware.

Moreover, in the prior art, the receiving side separates the spread spectrum code for synchronization acquisition whose time direction is opposite to the spread spectrum code on the transmitting side and the spread spectrum code for despreading used for despreading. However, there is a problem in that the amount of hardware increases because of the configuration that occurs in. This problem becomes even greater when a configuration using a plurality of spread spectrum codes is adopted.

Further, in the prior art, if a frequency shift occurs between the spread spectrum code for synchronization acquisition and the spread spectrum code on the transmission side, the PLL circuit is used for synchronization, but it takes a long time. At the time of communication, there is also a problem that accurate demodulation processing may not be realized because the synchronization cannot be maintained.

The present invention has been made in view of the above circumstances, and provides a new spread spectrum communication device which realizes an improvement in frequency utilization efficiency while suppressing an increase in the amount of hardware, and an accurate demodulation process. The purpose is to provide a new spread spectrum communication device to be realized.

[0014]

1 to 7 show the principle configuration of the present invention. In the figure, reference numeral 1 is a spread spectrum communication device equipped with the present invention.

The spread spectrum communication device 1 of FIG. 1 receives and demodulates a spread spectrum received signal,
The transmission signal is generated and output by performing spectrum spreading, and includes a generation unit 10, a detection unit 11, an instruction unit 12, a despreading unit 13, and a spreading unit 14.

The generating means 10 has a function of generating a plurality of spread spectrum codes having different periodic patterns, and generates a designated spread spectrum code. The detection means 11 detects the correlation between the received signal and the spread spectrum code generated by the generation means 10, and outputs a message to that effect when detecting a correlation match.

The instructing means 12, with respect to the generating means 10,
Instruct the continuous generation of the current spread spectrum code,
Instruct generation of a spread spectrum code with another periodic pattern. The despreading means 13 despreads the received signal using a spread spectrum code whose time direction is opposite to that of the spread spectrum code generated by the generating means 10. Diffusion means 14
Generates a transmission signal by spreading the transmission data that is primary-modulated using the spread spectrum code generated by the generation means 10.

In the spread spectrum communication device 1 of the present invention configured as described above, when the detecting means 11 detects the correlation coincidence, the instructing means 12 tells the generating means 10 that
In addition to instructing the continuous generation of the current spread spectrum code, when the detection means 11 detects a mismatch, it instructs the generation means 10 to generate a spread spectrum code of another periodic pattern.

By this instruction processing, the generating means 10 generates a spread spectrum code having the same periodic pattern as that used to generate the received signal (however, the direction of time is opposite), so that the reverse The spreading means 13 despreads the received signal by using a spread spectrum code whose time direction is opposite to that of the spread spectrum code generated by the generating means 10.

As described above, in the spread spectrum communication device 1 of the present invention shown in FIG. 1, since the spread spectrum code used for generating the received signal is searched for and the received signal is received, different periodic patterns are generated. The reception signal generated by using the spread spectrum code can be received, and the frequency utilization efficiency can be improved.

In the spread spectrum communication device 1 of the present invention having the above-described structure, the instructing means 12 sends the current spread spectrum code to the generating means 10 when the detecting means 11 detects a correlation mismatch. When the detection means 11 detects the correlation coincidence, the generation means 10 is instructed to generate another periodic pattern.

By this instruction processing, the generating means 10 generates a spread spectrum code having a periodic pattern different from that used for generating the received signal, so that the spreading means 14 generates the generating means 10. A transmission signal is generated by spreading transmission data using a spread spectrum code.

As described above, the spread spectrum communication apparatus 1 of the present invention shown in FIG. 1 adopts a configuration for generating a transmission signal by using a spread spectrum code having a periodic pattern different from that used for generating a reception signal. Therefore, it becomes possible to improve the frequency utilization efficiency.

The spread spectrum communication device 1 of FIG. 2 receives and demodulates a spread spectrum received signal, and includes a generating means 20, a correlating means 21, and an extinguishing means 2.
2, counter means 23, gate means 24, and selection means 25.

This generating means 20 generates a spread spectrum code. The correlating means 21 is for the received signal and the generating means 2.
When the correlation with the spread spectrum code of 0 is detected and the correlation match is detected, two correlation match signals are generated during one cycle of the spread spectrum code. The extinguishing means 22 extinguishes a prescribed one of the two correlation coincidence signals generated by the correlating means 21.

The counter means 23 counts the clock signals by using the correlation coincidence signal not eliminated by the elimination means 22 as a reset signal. The gate means 24 prohibits the input of the clock signal to the counter means 23 when the count value of the counter means 23 reaches a specified value. Selection means 25
When the correlating means 21 outputs a positive or negative correlation coincidence signal according to the primary modulation of the received signal, it selects either one of the correlation coincidence signals as valid and inputs it to the extinguishing means 22.

In the spread spectrum communication device 1 of the present invention configured as above, when the correlation means 21 detects the correlation agreement between the received signal and the spread spectrum code generated by the generation means 20, the spread spectrum code is detected. Two correlation coincidence signals are generated in one cycle.

When a SAW convolver is used as the correlating means 21, the correlating means 21 generates a correlation coincidence signal when the transmission data value is "0", and when the transmission data is "1", by the primary modulation. It operates so as not to generate a correlation coincidence signal. Depending on the primary modulation, correlation coincidence may be established for both transmission data values (1 or 0). At this time, the correlating means 21 receives the transmission data value One of them will create a state in which correlation agreement is established.

In this way, the correlating means 21 generates two correlation coincidence signals in one cycle of the spread spectrum code according to the transmission data value. Therefore, this correlation coincidence signal is 1
In consideration of the fact that only one shot is generated, one of the prescribed shots is erased, and the count value of the counter means 23 is reset using the correlation coincidence signal which is not erased.

In response to the processing of the extinguishing means 22, the counter means 23, for example, when the transmission data is "1", increments the count value in response to the non-occurrence of the correlation coincidence signal and transmits the count value. When the data is "0", the count value is reset in an accurate cycle in response to the generation of the correlation coincidence signal, and when the count value of the counter means 23 reaches the specified value, the gate means 24 The count value is fixed by prohibiting the input of the clock signal to the counter means 23.

According to this counting process, the counter means 23
From the specific output terminal of, for example, when the transmission data is "1", a high level value is output, and the transmission data is "0".
At the time of, a low level value is output, and demodulation data is generated.

As described above, the spread spectrum communication device 1 of the present invention shown in FIG. 2 can generate accurate demodulated data while following a simple circuit configuration. The spread spectrum communication device 1 in FIG. 3 receives and demodulates a spread spectrum received signal, and includes a plurality of first generation means 30, a selection means 31, a correlation means 32, and a plurality of generation means 33. And a plurality of second generating means 34 and a plurality of despreading means 35.

The first generating means 30 generates spread spectrum codes having different periodic patterns. The selecting means 31 sequentially selects the spread spectrum code generated by the first generating means 30. The correlating means 32 detects the correlation between the received signal and the spread spectrum code selected by the selecting means 31, and generates a correlation coincidence signal when detecting the correlation coincidence.

The generating means 33 is provided so as to be associated with the first generating means 30, and generates a periodic signal in synchronization with the correlation coincidence signal output from the correlating means 32 and having the same period. The second generating means 34 is provided in association with the first generating means 30, and generates a spread spectrum code whose time direction is opposite to that of the spread spectrum code generated by the paired first generating means 30. To do. The despreading means 35 is the second
And a second pair which is provided in association with the generating means 34 of
The received signal is despread using the spread spectrum code generated by the generating means 34.

In the spread spectrum communication device 1 of the present invention configured as described above, the selecting means 31 sequentially selects the spread spectrum codes generated by the first generating means 30 and inputs them to the correlating means 32. In response, the correlation means 32
Detects the correlation between the received signal and the spread spectrum code selected by the selection means 31, generates a correlation coincidence signal when detecting the correlation coincidence, and selects the first coincidence signal selected by the selection means 31. Generating means 33 associated with the means 30
To notify.

Upon receipt of this correlation coincidence signal, the generation means 33 generates a periodic signal which has the same period in synchronization with the correlation coincidence signal and which is selected by the selection means 31 as the first signal.
When the periodic signal is received, the second generating means 34 forming a pair with the second generating means 30 is notified.
Reference numeral 4 generates a spread spectrum code whose time direction is opposite to that of the spread spectrum code generated by the pair of first generating means 30. Upon receiving this spread spectrum code, the despreading means 35 forming a pair despread the received signal using this spread spectrum code.

As described above, in the spread spectrum communication apparatus 1 of the present invention shown in FIG. 3, when the configuration using a plurality of spread spectrum codes is adopted, the despreading processing of the received signal is executed by using one correlating means 32. As a result, it becomes possible to improve the frequency utilization efficiency while suppressing an increase in the amount of hardware.

The spread spectrum communication device 1 of FIG. 4 receives and demodulates a spread spectrum received signal, and has a plurality of generating means 40, a selecting means 41, a correlating means 42, and a plurality of generating means 43. And a plurality of despreading means 44.

The generating means 40 generates cyclic codes of M series having different periodic patterns. The selection means 41 is
The M-sequence cyclic code generated by the generating means 40 is sequentially selected. The correlator 42 detects the correlation between the received signal and the cyclic code of the M sequence selected by the selector 41, and generates a correlation coincidence signal when detecting the correlation coincidence.

The generating means 43 is provided so as to be associated with the generating means 40, generates a periodic signal having the same period in synchronization with the correlation coincidence signal output from the correlating means 42, and generates it as a pair. The generation means 40 for generating an M-sequence cyclic code having a time direction opposite to that of the M-sequence cyclic code generated by the means 40 is notified. The despreading means 44 is the generating means 40.
Are provided in association with each other, and the received signal is despread using the cyclic code of the M sequence generated by the pair generating means 40.

In the spread spectrum communication device 1 of the present invention having such a configuration, the selecting means 41 sequentially selects the cyclic code of the M sequence generated by the generating means 40 and the correlating means 4 is selected.
2 and receives it, the correlating means 42 detects the correlation between the received signal and the cyclic code of the M sequence selected by the selecting means 41, and generates a correlation matching signal when detecting the correlation matching. Then, the generating means 40 selected by the selecting means 41 is selected.
To the generation means 43 associated with.

Upon receipt of this correlation coincidence signal, the generation means 43 generates a periodic signal which is synchronized with the correlation coincidence signal and has the same period, and circulates the M sequence generated by the paired generation means 40. By notifying the generating means 40 that generates the M-sequence cyclic code whose time direction is opposite to that of the code, the generating means 40 of the notification destination generates the M-sequence cyclic code in synchronization with the periodic signal. To control.

The generating means 40 having received the periodic signal generates an M-sequence cyclic code whose time direction is opposite to that of the M-sequence cyclic code selected by the selecting means 41 in a form synchronized with the periodic signal. Then, receiving this M-sequence cyclic code,
The despreading means 44 forming a pair despreads the received signal using the cyclic code of the M sequence.

As described above, in the spread spectrum communication apparatus 1 of the present invention shown in FIG. 4, when the configuration using a plurality of spread spectrum codes is adopted, the despread processing of the received signal is executed by using one correlating means 42. As a result, it becomes possible to improve the frequency utilization efficiency while suppressing an increase in the amount of hardware. Moreover, the correlation means 42
Since it is not necessary to separately generate the spread spectrum code to be input to the above, it is possible to further suppress the increase in the amount of hardware as compared with the spread spectrum communication device 1 of the present invention shown in FIG.

The spread spectrum communication device 1 of FIG. 5 receives and demodulates the spread spectrum received signal, and comprises a plurality of first generating means 50, second generating means 51, and correlating means 52. , Generating means 53 and a plurality of despreading means 54.

The first generating means 50 generates spread spectrum codes having different periodic patterns. The second generating means 51 generates a spread spectrum code whose time direction is opposite to that of one of the spread spectrum codes generated by the first generating means 50.
The correlating means 52 detects the correlation between the received signal and the spread spectrum code generated by the second generating means 51, and outputs the correlation coincidence signal when detecting the correlation coincidence.

The generating means 53 generates a periodic signal having the same period in synchronization with the correlation coincidence signal output from the correlating means 52, and notifies the first generating means 50 of the periodic signal. The despreading means 54 is provided in association with the first generating means 50, and despreads the received signal using the spread spectrum code generated by the pair of first generating means 50.

In the spread spectrum communication device 1 of the present invention having the above-described structure, the second generating means 51 includes one spread spectrum code among the spread spectrum codes generated by the first generating means 50 and the time. A spread spectrum code having the opposite direction is generated and input to the correlating means 52, and in response to this, the correlating means 52 establishes the correlation between the received signal and the spread spectrum code selected by the second generating means 51. When detecting and detecting the correlation coincidence, a correlation coincidence signal is generated and is notified to the generation means 53.

Upon receipt of this correlation coincidence signal, the generation means 53 generates a periodic signal which has the same period in synchronization with the correlation coincidence signal and notifies the first generation means 50 of the periodic signal. The generating means 50 of No. 1 controls so as to generate the spread spectrum code in synchronization with the periodic signal.

Then, the first generating means 40 receiving the periodic signal generates the spread spectrum code at the same timing in a form synchronized with the periodic signal, receives the spread spectrum code, and forms a pair of despreading means. 54 uses this spread spectrum code to despread the received signals that have been multiplexed and spread at the same timing.

As described above, in the spread spectrum communication apparatus 1 of the present invention shown in FIG. 5, when the configuration using a plurality of spread spectrum codes is adopted, the despreading processing of the received signal is executed by using one correlating means 52. As a result, it becomes possible to improve the frequency utilization efficiency while suppressing an increase in the amount of hardware. Moreover, only one second generating means 51 for generating the spread spectrum code to be input to the correlating means 52 is prepared in accordance with the fact that the received signals are multiplexed and spread at the same timing, and the periodic signal is generated. Since it is sufficient to prepare only one generating means 53, the spread spectrum communication device 1 of the present invention shown in FIG.
It becomes possible to further suppress the increase in the amount of hardware.

The spread spectrum communication device 1 of FIG. 6 receives and demodulates the spread spectrum received signal, and includes a plurality of generating means 60, a correlating means 61, a generating means 62, and a plurality of despreading means. And 63.

The generating means 60 generates M-sequence cyclic codes having different periodic patterns including those having opposite time directions. The correlating means 61 is for the received signal and the generating means 6
A correlation match signal is output when the correlation with one of the M-sequence cyclic codes generated by 0 is detected and a correlation match is detected.

The generating means 62 generates a periodic signal having the same period in synchronization with the correlation coincidence signal output from the correlating means 61 and notifies the generating means 60 of it. The despreading means 63 is provided in association with the generating means 60, and despreads the received signal using the cyclic code of the M sequence generated by the generating means 60 forming a pair.

In the spread spectrum communication device 1 of the present invention having such a configuration, the correlating means 61 has 1 of the M-sequence cyclic codes in which the direction of time generated by the generating means 60 is opposite to that of the received signal. The input between the two inputs is used to detect the correlation between the two inputs, and when a correlation match is detected, a correlation match signal is generated and is notified to the generation means 62.

Upon receipt of this correlation coincidence signal, the generating means 62 generates a periodic signal which is in synchronization with the correlation coincidence signal and has the same period, and notifies the generating means 60 of it, whereby the generating means 60 is Control is performed so that an M-sequence cyclic code is generated in synchronization with the periodic signal.

Then, the generating means 60 having received this periodic signal generates M-sequence cyclic codes at the same timing in synchronization with the periodic signal, receives the M-sequence cyclic codes, and despreads into a pair. The means 63 uses the cyclic code of the M sequence to despread the received signals that are multiple spread at the same timing.

As described above, in the spread spectrum communication device 1 of the present invention shown in FIG. 6, when the configuration using a plurality of spread spectrum codes is adopted, the despreading process of the received signal is executed by using one correlating means 61. As a result, it becomes possible to improve the frequency utilization efficiency while suppressing an increase in the amount of hardware. Moreover, the correlation means 61
Since it is not necessary to separately generate the spread spectrum code to be input to the above, it is possible to further suppress the increase in the amount of hardware as compared with the spread spectrum communication device 1 of the present invention shown in FIG.

The spread spectrum communication device 1 of FIG. 7 receives and demodulates a spread spectrum received signal, and includes a first control means 70 and a first despreading means 71.
A second control means 72, a second despreading means 73,
And selecting means 74.

The first control means 70 has a function of generating a spread spectrum code for despreading, and controls the generation timing of the spread spectrum code for despreading.
Further, the frequency of the spread spectrum code for despreading may be controlled according to the PLL system. The first despreading means 71 despreads the received signal using the despreading spread spectrum code generated by the first control means 70.

The second control means 72 is the first control means 7
It has a function of generating a spread spectrum code for despreading independently of 0, and controls the frequency of the spread spectrum code for despreading according to the DLL method. The second despreading means 73 despreads the received signal using the despreading spread spectrum code generated by the second control means 72. The selecting means 74 selects either the output signal of the first despreading means 71 or the output signal of the second despreading means 73.

In the spread spectrum communication device 1 of the present invention configured as described above, the first control means 70 detects the correlation between the received signal and the spread spectrum code for reception to prepare the inverse signal to be prepared. Controls the generation timing of spread spectrum code for spreading, and further, if necessary, PLL
The frequency of the spread spectrum code for despreading is controlled according to the method. Then, in response to this, the first despreading means 71 despreads the received signal using the despreading spread spectrum code generated by the first control means 70.

On the other hand, the second control means 72 controls the generation timing of the spread spectrum code for despreading prepared according to the correlation detection result of the first control means 70,
The frequency of the spread spectrum code for despreading is controlled according to the DLL method. Then, in response to this, the second despreading means 73 despreads the received signal using the despreading spread spectrum code generated by the second control means 72.

Upon receiving these despreading processing, the selection means 7
No. 4 has a characteristic that the first control means 70 can acquire synchronization at a higher speed than the second control means 72 that executes synchronization acquisition by using the DLL method by executing the synchronization acquisition by using the PLL method. On the other hand, the second control means 72 has DL
In consideration of the fact that performing synchronization acquisition using the L method has the characteristic that the acquired synchronization can be held for a longer time than the first control means 70 that executes synchronization acquisition using the PLL method. , The output signal of the first despreading means 71 is selected, and then, when the second control means 72 completes the synchronization acquisition, the output signal of the second despreading means 73 is output.

Then, when the selecting means 74 is selecting the output signal of the second despreading means 73, the first control means 70 performs processing so as to start the next synchronization processing of the spread spectrum code.

As described above, in the spread spectrum communication apparatus 1 of the present invention shown in FIG. 7, the PLL system is used to capture the synchronization with the received signal at high speed, and the DLL system is used to accurately synchronize the received signal for a long time. Because it takes the configuration to hold,
Accurate demodulation processing can be realized.

[0067]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail according to embodiments. First, the present invention whose principle configuration is shown in FIG. 1 (hereinafter sometimes referred to as the first invention) will be described.

FIG. 8 shows an embodiment of the first invention. The spread spectrum communication device 1 according to the first aspect of the invention receives and demodulates a spread spectrum received signal, or performs spread spectrum to generate and output a transmitted signal. As shown in this figure, a spread spectrum communication device 1 according to the first invention is a reception PN generation circuit for generating a reception spread spectrum code (the time direction of which is opposite to that of the transmission side spread spectrum code). 100, a first local oscillator 101 that generates a carrier signal, a first multiplier 102 that multiplies the spread spectrum code generated by the reception PN generation circuit 100 and the carrier signal generated by the first local oscillator 101. , A second local oscillator 103 that generates a carrier signal, a second multiplier 104 that multiplies a received signal by a carrier signal that the second local oscillator 103 generates, and an output signal of the first multiplier 102. And the output signal of the second multiplier 104 are input, and a SAW convolver 10 that outputs a correlation coincidence signal when the correlation between them is coincident with each other. If, SAW convolver 1
The output detection circuit 106 for shaping the waveform of the correlation coincidence signal output from the signal 05, the transmission PN generation circuit 107 for generating the transmission spread spectrum code, and the reception PN generation circuit 10.
A 0 / transmission PN generation circuit 107 is provided with a PN select circuit 108 for instructing generation of a current spread spectrum code or generation of another spread spectrum code.

9 and 10, the receiving PN generating circuit 1 is shown.
00 (transmission PN generation circuit 107) and PN selection circuit 108 are shown as an example of a detailed circuit configuration. In the figure, 110 is a shift register, 111 is an AND circuit, 1
12 is a memory, 113 is an EOR circuit, 114 is a flip-flop, 115 is an EOR circuit, 116 is an AND circuit,
117 is a counter, 118 is a delay circuit, 119 is EO
R circuit, 120 is a delay circuit, 121 is an EOR circuit, 1
22 is an OR circuit.

The shift register 110 has a configuration in which the output value of the EOR circuit 113 is input to the shift terminal,
Clock signal used to generate spread spectrum code
While shifting (CHIP CK) and latching,
Latch data is reset in response to the input of the periodic signal (PN CYC) of the spread spectrum code shown in. AND circuit 1
11 is provided corresponding to the output value of the shift register 110, and inputs the output value of the paired shift register 110 and the control signal of the memory 112 associated therewith, and calculates a logical product value of the two input values. And output.

The memory 112 manages control signals according to the number of AND circuits 111 (having a data length corresponding to the number of AND circuits 111 and having high-level / low-level signal values) and controlling those control signals. From among the above, the one indicated by the count value of the counter 117 is read and output to the AND circuit 111. The EOR circuit 113 receives the output value of the AND circuit 111 as an input, calculates the exclusive OR value of those input values, and outputs the exclusive OR value. The flip-flop 114, when the output detection circuit 106 outputs a correlation coincidence signal (detection output),
Reads and outputs the high level input to the D terminal.

The EOR circuit 115 receives the RX / TX signal indicating the transmission / reception mode (high level in the reception mode and low level in the transmission mode) and the flip-flop 1.
With the output signal of 14 as an input, the exclusive OR value of the two input values is calculated and output. AND circuit 116
Takes the output value of the EOR circuit 115 and the periodic signal (PN CYC) of the spread spectrum code as input, and calculates and outputs a logical product value of the two input values. The counter 117 is
The output value of the AND circuit 116 is counted and EOR
When the circuit 121 outputs the output signal, the count value is reset.

The delay circuit 118 delays the signal value of the least significant bit of the counter 117. EOR circuit 119
Takes as input the signal value of the least significant bit of the counter 117 and the output value of the delay circuit 118, and calculates and outputs the exclusive OR value of the two input values. Delay circuit 12
0 delays the RX / TX signal. EOR circuit 121
Receives the RX / TX signal and the output value of the delay circuit 120 as input and calculates and outputs the exclusive OR value of the two input values. The OR circuit 122 receives the output value of the EOR circuit 119 and the output value of the EOR circuit 121, and
The logical sum value of the two input values is calculated and input to the reset terminal of the flip-flop 114.

In the embodiment of the first aspect of the invention configured as described above, the shift register 110 sets all latch data to "1" by the periodic signal (PN CYC) of the spread spectrum code.
After resetting to, latch the clock signal (CHIP CK) while shifting it.

At this time, the memory 112 reads out what the count value of the counter 117 indicates from the control signals to be managed and outputs it to the AND circuit 111, and the AND circuit 111.
Controls the conduction / non-conduction of the latch data of the shift register 110 according to the control signal, while the EOR circuit 11
3 and receives it, the EOR circuit 113 calculates and outputs the exclusive OR value of the output values of the AND circuits 111.

In this way, the memory 112 realizes the circuit configuration as shown in FIG. 12 according to the count value of the counter 117 to generate the M-sequence cyclic code from the most significant bit of the shift register 100. As the spread spectrum code is generated, the tap position of the shift register 100 is sequentially switched according to the count value of the counter 117, thereby changing the generated spread spectrum code.

The count value of the counter 117 is updated according to the following processing procedure. That is, the EOR circuit 121
Receives the RX / TX signal indicating the transmission / reception mode and the RX / TX signal delayed by the delay circuit 120, and when the transmission / reception mode is switched to a high level, as shown in the time chart of FIG. The pulse of is output. On the other hand, the EOR circuit 119 receives the signal value of the least significant bit of the counter 117 and the signal value of the least significant bit delayed by the delay circuit 118, and then the counter 1
When the count value of 17 changes, a high level pulse is output.

The flip-flop 114 has these EOs.
When the R circuits 119 and 121 output pulses, OR
Receiving it via circuit 122 resets the output value. After that, when the output detection circuit 106 outputs the correlation coincidence signal (detection output), the high level input to the D terminal is read and output.

Receiving the high level output of the flip-flop 114, the EOR circuit 115 indicates that it is in the reception mode when the RX / TX signal shows the high level, as shown in the time chart of FIG. When shown, the AND circuit 11 outputs the low level.
6 is cut off, and the input of the periodic signal (PN CYC) of the spread spectrum code to the counter 117 is cut off. As a result, the counter 117 stops counting.

On the other hand, when the RX / TX signal shows the low level, that is, when it is in the transmission mode, the AND circuit 116 is turned on by outputting the high level, and the spread spectrum code to the counter 117 is outputted. Permits input of the periodic signal (PN CYC) of. Thereby, the counter 117 continues its counting.

Then, the counter 117 has the EOR circuit 1
When 21 outputs a pulse, that is, when the transmission / reception mode is switched, the count value is reset. In this way, the counter 117 counts up the count value when the output detection circuit 106 does not output the correlation coincidence signal when it is in the reception mode, so that the counter 112 is stored in the memory 112. , The output detection circuit 1 while instructing the output of the next spread spectrum code
When 06 outputs a correlation coincidence signal, the count value is fixed to instruct the memory 112 to output the currently spread spectrum code.

The received signal is despread by using the spread spectrum code whose time direction is opposite to that of the spread spectrum code output by this latter instruction. In addition, the counter 117 fixes the count value when the output detection circuit 106 does not output the correlation coincidence signal in the transmission mode, so that the memory 1
When the output detection circuit 106 outputs a correlation coincidence signal while instructing 12 to output the currently spread spectrum code, the count value is incremented to the memory 112. On the other hand, the output of the next spread spectrum code is instructed.

The spread spectrum code output according to this latter instruction is used to spread the primary-modulated transmission data for transmission. According to the processing of the counter 117, the spread spectrum communication device 1 of the first invention is
Then, it becomes possible to receive the reception signals generated by using the spread spectrum codes having different periodic patterns, and it becomes possible to realize the improvement of the frequency utilization efficiency. Since the transmission signal is generated by using the spread spectrum code having the periodic pattern different from that used for the generation of the reception signal, the frequency utilization efficiency can be improved.

The present invention whose principle configuration is shown in FIG. 2 (hereinafter sometimes referred to as the second invention) will be described below. The spread spectrum communication device 1 according to the second invention is
It receives a spectrum-spread reception signal and demodulates it, and has a configuration in which demodulation data is directly generated from the correlation coincidence signal output from the SAW convolver.

In spread spectrum communication, a carrier wave is first-modulated by transmission data and then spread by a spread spectrum code. Frequency modulation (FSK) may be used as the primary modulation. In this case, whether the transmission data is “1” or “0” is determined by SAW.
Center frequency of the convolver (the local oscillator 10 described above
The frequencies of the carrier signals generated by 1 and 103 are different. From this, the SAW convolver outputs the correlation match signal when the transmission data value has the same center frequency (for example, “0”), and outputs the correlation coincidence signal when the transmission data value does not have the same center frequency (for example, “1”). Operates so that it does not output.

Phase modulation (PS
K) is sometimes used. In this case, different spread spectrum codes may be used for the transmission data value “1” and the transmission data value “0”, and the receiving side may perform despreading using either one of them. , SAW
The convolver outputs a correlation match signal when the transmission data value with which the spread spectrum code matches (for example, “0”) and outputs a correlation match signal when the transmission data value with which the spread spectrum code does not match (for example, “1”). Works like not.

As described above, the operation of the SAW convolver can be defined so that the correlation match signal is output when one transmission data value is output and the correlation match signal is not output when the other transmission data value is output.

When the SAW convolver performs such an operation, for example, as shown in FIG. 14, while the correlation matching signal is being output, a pulse indicating a low level is output and while the correlation matching signal is not being output. By outputting a pulse indicating a high level, the received signal can be demodulated.

According to the second aspect of the invention, the SA
In this configuration, demodulation data is directly generated from the correlation coincidence signal output from the W convolver. At this time, the correlation coincidence signal will generate two correlation coincidence signals during one cycle of the spread spectrum code (that is, during one transmission data value). It will happen to be one shot. In consideration of this point, the second invention adopts a configuration in which demodulated data is directly generated from the correlation coincidence signal output from the SAW convolver.

FIG. 15 shows an embodiment of the second invention. As shown in this figure, a spread spectrum communication device 1 according to the second invention uses a clock generation circuit 200 for generating a clock signal for generating a spread spectrum code and a clock signal generated by the clock generation circuit 200 for reception. Signal generation for generating a reference signal by generating a spread spectrum code for transmission (the time direction is opposite to that of the spread spectrum code on the transmission side) and multiplying it with a carrier signal generated by a local oscillator (not shown) Bowl 201
And a down converter 20 for multiplying a received signal by a carrier signal generated by a local oscillator (not shown) and outputting the product.
2, a reference signal generated by the reference signal generator 201, and an output signal of the down converter 202 as input, and a SAW convolver 203 that outputs two correlation matching signals during one cycle of the spread spectrum code. Detection circuit 20 for detecting the correlation coincidence signal output from the convolver 203
4 and a demodulation circuit 205 that generates demodulation data of a reception signal from the clock signal generated by the clock generation circuit 200 and the output signal of the detection circuit 204.

Here, in the detection circuit 204, the SAW convolver 203 may output a correlation coincidence signal for both the transmission data value "1" and the transmission data value "0". At that time, the transmission data value Since a positive / negative correlation match signal is output according to the above, by deleting the correlation match signal with a negative sign among them, processing is performed so that the correlation match signal is output only with one of the transmission data values. It is provided in.

For example, as primary modulation, phase modulation (PS
When K) is used, the same spread spectrum code may be used for the transmission data value “1” and the transmission data value “0”. In that case, the transmission data value “1” and the transmission data value “0” may be used. Since the correlation coincidence signal is output by both of the above, the detection circuit 204 is used to erase the correlation coincidence signal having a negative sign.

The demodulation circuit 205 for generating demodulated data of the received signal includes a counter 206 and an AN as shown in the figure.
D circuit 207, comparator 208, AND circuit 2
And 09.

This counter 206 counts the clock signals generated by the clock generation circuit 200. The AND circuit 207 inputs the clock signal generated by the clock generation circuit 200 and the inverted value of the signal value of the most significant bit of the counter 206, calculates the logical product value of the two input values, and inputs it to the counter 206. Input to the terminal.

The comparator 208 outputs a high level when the count value of the counter 208 indicates a time slightly longer than the half cycle of the spread spectrum code, and outputs a low level when the count value does not reach there. . The AND circuit 209 receives the correlation coincidence signal output from the detection circuit 204 and the output signal of the comparator 208 as input, calculates the logical product value of these two input values, and outputs it to the reset terminal of the counter 206.

In the embodiment of the second invention having such a configuration, the AND circuit 209 receives the high level output of the comparator 208, and when the detection circuit 204 outputs the correlation coincidence signal, it outputs to the counter 206. Issue a reset instruction. As a result, the count value of the counter 206 becomes "0", the comparator 208 outputs a low level, the signal value of the most significant bit of the counter 206 becomes "0", and the AND circuit 207 generates the clock. The counter 206 detects the clock signal generated by the circuit 200.
To enter.

Upon receiving the clock signal from the AND circuit 207, the counter 206 starts counting. At the time of this counting, the detection circuit 204 outputs the second correlation matching signal (the second correlation matching signal generated during one period of the spread spectrum code). At this time, the comparator 208 Since the low level is still output, the AND circuit 209 ignores the second correlation coincidence signal.

When the count of the counter 206 advances, the comparator 208 outputs a high level, and in response to this, A
The ND circuit 209 issues a reset instruction to the counter 206 when the detection circuit 204 outputs the next correlation coincidence signal.

In this way, when the detection circuit 204 is outputting the correlation coincidence signal, before the signal value of the most significant bit of the counter 206 changes to "1", the counter 20
Since the count value of 6 is reset to "0", the signal value of the most significant bit of the counter 206 remains low level.

During this operation, if the detection circuit 204 stops outputting the correlation coincidence signal, the AND circuit 209 stops issuing the reset instruction to the counter 206. From this, the counter 206 counts up the count value, and when the count advances, the signal value of the most significant bit of the counter 206 changes to “1”, whereby the AND circuit 207 causes the clock for the counter 206 to clock. Stop signal input. In response to this, the signal value of the most significant bit of the counter 206 remains at the high level. At this time, the comparator 208 outputs a high level.

Then, during this operation, the detection circuit 2
When 04 starts to output the correlation coincidence signal, the counter 206 is repeatedly reset according to the above-described operation while ignoring one shot of the correlation coincidence signal output from the detection circuit 204, thereby repeatedly resetting the counter 206. A state in which the signal value of the most significant bit of 206 remains low level is created.

As described above, in the spread spectrum communication device 1 of the second invention, for example, from the most significant bit of the counter 206, the SAW convolver 203 indicates a low level while the correlation match signal is output, By outputting demodulated data indicating a high level while the coincidence signal is not output, a transmission data value that outputs a correlation coincidence signal indicates a low level, and a transmission data value that does not output a correlation coincidence signal indicates a high level. It produces demodulated data.

Moreover, at this time, since the demodulated data is generated while ignoring one of the stipulations of the correlation coincidence signals generated twice in one period of the spread spectrum code, FIG. As shown in the time chart of 1, the demodulated data can be accurately generated even if only one correlation coincidence signal is generated due to the timing and the like. Here, in FIG. 16, 'is the output signal of the detection circuit 204, is the output signal of the comparator 208, and is A
The output signal of the ND circuit 209 indicates the signal value of the most significant bit of the counter 206.

The present invention whose principle configuration is shown in FIG. 3 (hereinafter sometimes referred to as the third invention) will be described below. The spread spectrum communication device 1 according to the third invention is
It receives the spread spectrum received signal and performs demodulation processing.

FIG. 17 shows an embodiment of the third invention. As shown in this figure, on the transmission side, a plurality of PN generation circuits 350 that generate spread spectrum codes of different periodic patterns, a modulation circuit 351 that is provided in association with the PN generation circuit 350 and that modulates transmission data, Modulation circuit 3
A multiplier 352 which is provided in association with 51 and which performs spread processing by multiplying the spread spectrum code generated by the PN generation circuit 350 and the output signal of the modulation circuit 351;
By providing a synthesizing circuit 353 that multiplexes the output signal of the multiplier 352 in a time division form, the transmission data is modulated, spread, multiplexed, and transmitted in a plurality of time division form channels. The spread spectrum communication device 1 according to the invention receives the signal sent from the transmitting side and performs demodulation processing.

The spread spectrum communication device 1 according to the third aspect of the present invention includes a plurality of receiving Ps provided corresponding to channels.
N generation circuit 300, selection circuit 301, and correlator 302 including a SAW convolver or matched filter
A plurality of timing generator circuits 303 provided for the channels, a plurality of despreading PN generation circuits 304 provided for the channels, a plurality of multipliers 305 provided for the channels, and a plurality of channels provided for the channels. And a demodulation circuit 306.

The receiving PN generating circuit 300 generates a receiving spread spectrum code (having a time direction opposite to that of the transmitting side spread spectrum code) having a different periodic pattern. The selection circuit 301 sequentially selects the spread spectrum code generated by the reception PN generation circuit 300. The correlator 302 detects the correlation between the received signal and the spread spectrum code selected by the selection circuit 301, and generates a correlation matching signal (PN pattern matching signal) when detecting the correlation matching.

The timing generator circuit 303 is provided so as to correspond to the reception PN generation circuit 300, and, for example, as shown in FIG. 18, a cyclic process for returning the count value to the original at the same cycle as the spread spectrum code. The reception PN generation circuit 3 is composed of a counter, and the correlator 302 outputs a correlation coincidence signal and the selection circuit 301 forms a pair.
When 00 is selected and the reset enable signal is output, the count value is reset to generate a periodic signal that is synchronized with the correlation match signal and has the same period as the correlation match signal.

The despreading PN generator circuit 304 receives P
It is provided in association with the N generation circuit 300 and generates a spread spectrum code whose time direction is opposite to that of the spread spectrum code generated by the paired reception PN generation circuit 300. The multiplier 305 is provided in association with the despreading PN generation circuit 304 and forms a pair with the despreading PN generation circuit 30.
The received signal is despread using the spread spectrum code generated by 4. The demodulation circuit 306 is provided so as to be associated with the multiplier 305, and demodulates the despread reception signal output from the multiplier 305 which forms a pair.

Although not shown in the figure, the correlator 302 is provided with a local oscillator for generating a carrier signal, and inputs a multiplication value with the carrier signal generated by the local oscillator. Sometimes. Although not shown in the figure, there may be a configuration in which a demodulation circuit 306 is provided at a subsequent stage with a selection circuit for selecting those output signals.

In the third embodiment of the present invention constructed as above, the selection circuit 301 sequentially selects the spread spectrum codes generated by the reception PN generation circuit 300 and inputs them to the correlator 302. In response, the correlator 302 detects the correlation between the received signal and the spread spectrum code selected by the selection circuit 301, generates a correlation matching signal when detecting the correlation matching, and outputs it to the selection circuit 301. The signal is output to the timing generator circuit 303 associated with the selected reception PN generation circuit 300.

Upon receiving this correlation coincidence signal, the timing generator circuit 303 follows the above-mentioned configuration.
A despreading PN paired with the reception PN generation circuit 300 selected by the selection circuit 301 is generated by generating a periodic signal in synchronization with the correlation coincidence signal and having the same period as the correlation coincidence signal.
The despreading PN generation circuit 304 outputs the signal to the generation circuit 304, and the despreading PN generation circuit 304 receives the spread spectrum code generated by the reception PN generation circuit 300. Generate sign.

Upon receiving this spread spectrum code, the multiplier 305 forming a pair despreads the received signal using this spread spectrum code, and the demodulating circuit 30 forming a pair.
6 demodulates the despread reception signal.

FIG. 19 shows a time chart of the third invention. In this time chart, the correlator 302 is opened once the synchronous acquisition of n channels is performed, but as shown in the time chart of FIG. It is also possible to adopt a configuration in which the spread spectrum code generated by the receiving PN generation circuit 300 is selected for click and input to the correlator 302. With this configuration, it is possible to reliably prevent the synchronization from being lost.

As described above, in the spread spectrum communication device 1 of the third aspect of the invention, when the configuration using a plurality of spread spectrum codes is adopted, the despreading process of the received signal can be executed by using one correlator 302. Therefore, it becomes possible to improve the frequency utilization efficiency while suppressing an increase in the amount of hardware.

In the third invention, two types of PN generation circuits, that is, a reception PN generation circuit 300 and a despreading PN generation circuit 304 are prepared in order to generate a spread spectrum code whose time directions are opposite. In the present invention whose principle configuration is shown in FIG. 4 (hereinafter sometimes referred to as the fourth invention),
The two types of PN generation circuits are commonly used.

An M-sequence cyclic code is often used as the spread spectrum code. Some of the M-sequence cyclic codes have opposite time directions. For example, in an M-sequence cyclic code generation circuit including six delay elements as shown in FIG. 21 and an adder that performs addition of mod2, x ⁶ + x + 1 = 0 x ⁶ + x ⁵ + 1 = 0 x ⁶ + x ⁵ + x ² + x + 1 = 0 x ⁶ + x ⁵ + x ³ + x ² + 1 = 0 x ⁶ + x ⁴ + x ³ + x + 1 = 0 0 x ⁶ + x ⁵ + x ⁴ + x + 1 = 0 To generate.

22 and 23 show cyclic codes of these six types of M sequences. As shown in this figure, the cyclic codes of these 6 types of M sequences have 63 cycles as one cycle. As can be seen from this figure, the cyclic code identified by (a) and the cyclic code identified by (b) The identified cyclic code has the same periodic pattern whose time direction is opposite, and the cyclic code identified in (c) and the cyclic code identified in (f) have opposite time directions. Has the same periodic pattern as
The cyclic code identified in (d) and the cyclic code identified in (e) have the same periodic pattern with opposite time directions.

The fourth aspect of the invention realizes that the receiving PN generating circuit and the despreading PN generating circuit are made common by using the property of the M-sequence cyclic code. FIG.
4 shows an embodiment of the fourth invention.

As shown in this figure, the spread spectrum communication device 1 according to the fourth aspect of the present invention includes a plurality of PN generation circuits 400 provided for channels, a selection circuit 401, and an S circuit.
A correlator 402 including an AW convolver or a matched filter, a local oscillator 403, and a multiplier 404.
A plurality of timing generator circuits 405 provided corresponding to the channels, a plurality of multipliers 406 provided corresponding to the channels, and a plurality of demodulation circuits 407 provided corresponding to the channels.

For example, six PN generating circuits 400 are prepared in accordance with the M-series cyclic code used on the transmitting side, and generate the six types of M-series cyclic codes shown in FIGS. 22 and 23. To do.

For convenience of explanation, the first PN generation circuit 400 (PN 1) generates the cyclic code identified by (a), and the second PN generation circuit 400 (PN 2)
Generates the cyclic code identified by (b), and the third P
N generation circuit 400 (PN 3) generates the cyclic code identified by (c), and the fourth PN generation circuit 400 (PN
4) generates the cyclic code identified by (d), and the fifth PN generation circuit 400 (PN 5) generates the cyclic code identified by (e), and the sixth PN generating circuit 400
(PN 6) generates the cyclic code identified by (f).

The selection circuit 401 sequentially selects the cyclic code of the M sequence generated by the PN generation circuit 400. Correlator 4
02 detects the correlation between the received signal and the cyclic code of the M sequence selected by the selection circuit 401, and generates a correlation matching signal when detecting the correlation matching. Local oscillator 403
Generate a carrier signal. The multiplier 404 includes a carrier signal generated by the local oscillator 403 and the selection circuit 40.
The multiplication value with the cyclic code of the M sequence selected by 1 is calculated,
Input to the correlator 402.

The timing generator circuit 405 has a P
It is provided so as to correspond to the N generation circuit 400, and for example, as shown in FIG.
8 is composed of a cyclic counter that performs a counting process of returning the count value to the original in the same cycle as the spread spectrum code, and is synchronized with the correlation match signal output from the correlator 402 and Generates a periodic signal having the same period.

Hereinafter, for convenience of explanation, the first timing
Generator circuit 405 (TG 1) is the second P
N generation circuit 400 (PN No. 2 associated with 2)
Eye timing generator circuit 405 (TG 2)
Is the first PN generation circuit 400 (PN Compatible with 1)
And a third timing generator circuit 40 attached
5 (TG 3) is the sixth PN generation circuit 400 (P
N 6) is associated with the fourth timing gene
Circuit 405 (TG 4) is the fifth PN occurrence
Circuit 400 (PN 5), which corresponds to the 5th
Imming generator circuit 405 (TG 5) is the fourth
The PN generator circuit 400 (PN Associated with 4)
The sixth timing generator circuit 405 (T
G 6) is the third PN generation circuit 400 (PN
3).

Multiplier 406 is provided in association with PN generating circuit 400, and despreads the received signal using the M-sequence cyclic code generated by paired PN generating circuits 400.
The demodulation circuit 407 is provided so as to be associated with the multiplier 406 and demodulates the despread reception signal output from the paired multiplier 406.

Although not shown in this figure, there may be a configuration in which a demodulation circuit 407 is provided with a selection circuit which selects the output signals of the demodulation circuit 407. In the embodiment of the fourth invention configured as above, the selection circuit 401 sequentially selects the cyclic code of the M sequence generated by the PN generation circuit 400, inputs it to the correlator 402, and receives it. Correlator 40
2 detects the correlation between the received signal and the cyclic code of the M sequence selected by the selection circuit 401, generates a correlation matching signal when detecting the correlation matching, and outputs it to the PN selected by the selection circuit 401. It outputs to the timing generator circuit 405 associated with the generation circuit 400.

For example, if the selection circuit 401 is the first P
N generation circuit 400 (PN When selecting 1), that is, when selecting the cyclic code of the M sequence identified by (a), when the correlator 402 generates the correlation coincidence signal, it outputs it to the second timing generator circuit 405 (T
G 2), and the selection circuit 401 causes the third PN generation circuit 400 (PN When selecting 3), that is, when selecting the cyclic code of the M sequence identified by (c), when the correlator 402 generates the correlation coincidence signal, it outputs it to the sixth timing generator circuit 40.
5 (TG It is output to 6).

Upon receiving this correlation coincidence signal, the timing generator circuit 405 follows the above-mentioned configuration.
The PN generation circuit 400 generates a periodic signal in synchronization with the correlation coincidence signal and has the same period as the correlation coincidence signal, and outputs the periodic signal to the PN generation circuit 400 to which the same serial number is assigned. Control is performed so as to generate an M-sequence cyclic code in synchronization with

For example, the second timing generator circuit 405 (TG 2) generates a periodic signal,
The second PN generation circuit 400 (PN 2) to output the second PN generation circuit 400 (PN 2) controls so as to generate the cyclic code of the M sequence identified in (b) in synchronization with the periodic signal, and the sixth timing generator circuit 405 (TG 6) generates the periodic signal, the sixth PN generation circuit 400 (PN
6) to output the sixth PN generation circuit 400.
(PN 6) controls so as to generate an M-sequence cyclic code identified by (f) in a form synchronized with the periodic signal.

Then, the PN generating circuit 400 that has received this periodic signal generates an M-series cyclic code in a form synchronized with the periodic signal, receives the M-series cyclic code, and the multiplier 406 that forms a pair , The received signal is despread using this M-sequence cyclic code, and the paired demodulation circuit 407 demodulates the despread received signal.

In this way, for example, the selection circuit 401
Is the first PN generation circuit 400 (PN By selecting 1), when the correlator 402 detects the correlation with the received signal using the M-sequence cyclic code identified in (a), the second timing generator circuit 405 (T
G 2) generates a periodic signal, and in response to this, the second PN generation circuit 400 (PN 2) generates an M-sequence cyclic code identified in (b) in a form synchronized with the periodic signal, and the multiplier 406 forming a pair is the M-sequence cyclic code identified in (a). The received signal is despread using the M-sequence cyclic code identified in (b), which has the opposite time direction.

In addition, for example, the selection circuit 401 is the third PN generation circuit 400 (PN By selecting 3), the correlator 402 detects the correlation with the received signal using the cyclic code of the M sequence identified in (c), and the sixth timing generator circuit 405 (TG 6)
Generates a periodic signal, and receives it, the sixth PN
Generation circuit 400 (PN 6) generates the M-sequence cyclic code identified by (f) in a form synchronized with the periodic signal, and the multiplier 406 forming the pair is the M-sequence cyclic code identified by (c). The received signal is despread using the cyclic code of the M sequence identified by (f), which has the opposite time direction.

FIG. 25 shows a time chart of the fourth invention. Here, in this time chart,
The PN generator circuit 400 (PN 1) generated M-sequence cyclic code and the nth PN generation circuit 400 (PN
It is assumed that the direction of time is opposite to that of the M-sequence cyclic code generated in n).

As described above, in the spread spectrum communication device 1 of the fourth invention, the receiving PN generating circuit 300 required in the third invention is used by using the property of the cyclic code of the M sequence.
/ The despreading PN generator circuit 304 is replaced by the PN generator circuit 400.
Since this is all that is required, it is possible to realize an improvement in frequency utilization efficiency with a smaller amount of hardware than in the third invention.

The selection circuit 401, like the selection circuit 301 of the third invention, cyclically generates the PN generation circuit 4.
A configuration may be adopted in which a spread spectrum code generated by 00 is selected and input to the correlator 402.

In the third and fourth aspects of the invention, the transmitting side employs a method of multiplexing spread transmission signals in a time division form, but a method of multiplexing spread transmission signals in a simultaneous timing form. When the above is adopted, it becomes possible to improve the frequency utilization efficiency with a smaller amount of hardware.

The present invention whose principle structure is shown in FIG.
This is sometimes realized by the fifth invention). FIG. 26 shows an embodiment of the fifth invention.

As shown in this figure, the spread spectrum communication device 1 according to the fifth aspect of the present invention includes a receiving PN generating circuit 500.
, A correlator 501 including a SAW convolver or a matched filter, a local oscillator 502, and a multiplier 5
03, a timing generator circuit 504, and a plurality of despreading PN generation circuits 50 provided corresponding to channels.
5 and a plurality of multipliers 506 provided corresponding to the channels
And a plurality of demodulation circuits 507 provided corresponding to the channels
With.

This reception PN generation circuit 500 generates a reception spread spectrum code (the time direction is opposite to that of one of the transmission side spread spectrum codes). The correlator 501 detects the correlation between the received signal and the spread spectrum code generated by the receiving PN generation circuit 500,
A correlation match signal is generated when a correlation match is detected. The local oscillator 502 generates a carrier signal. The multiplier 503 calculates the multiplication value of the carrier signal generated by the local oscillator 502 and the spread spectrum code generated by the reception PN generation circuit 500, and inputs it to the correlator 501.

The timing generator circuit 504 is constituted by, for example, a cyclic counter for performing a counting process for returning the count value to the original in the same cycle as the spread spectrum code, as shown in FIG. 18, and outputs it from the correlator 501. A periodic signal synchronized with the correlation matching signal and having the same period as the correlation matching signal is generated.

The despreading PN generating circuit 505 generates the spread spectrum code used on the transmitting side. Multiplier 506
Are provided in association with the despreading PN generation circuit 505, and despread the received signal using the spread spectrum code generated by the paired despreading PN generation circuit 505. The demodulation circuit 507 is provided in association with the multiplier 506,
The despread reception signal output from the paired multiplier 506 is demodulated.

In the spread spectrum communication device 1 of the fifth aspect of the invention thus configured, the receiving PN generating circuit 500 is provided.
Generates a spread spectrum code whose time direction is opposite to that of one of the spread spectrum codes on the transmission side and inputs the spread spectrum code to the correlator 501. In response to this, the correlator 501 receives the received signal and the reception PN. The correlation with the spread spectrum code generated by the generation circuit 500 is detected, and when a correlation match is detected, a correlation match signal is generated and output to the timing generator circuit 504.

Upon receiving this correlation coincidence signal, the timing generator circuit 504 follows the above-mentioned configuration.
All the despreading PN generation circuits 505 are generated by generating a periodic signal that is in synchronization with the correlation coincidence signal and has the same period as the correlation coincidence signal, and outputs it to the despreading PN generation circuit 505. Generates a spread spectrum code at the same timing in synchronization with a periodic signal.

Upon receiving this spread spectrum code, the multiplier 506 forming a pair despreads the received signal using this spread spectrum code, and the demodulating circuit 50 forming a pair.
7 demodulates the despread reception signal.

FIG. 27 shows a time chart of the fifth invention. As described above, in the spread spectrum communication device 1 of the fifth invention, the plurality of receiving PN generating circuits 300 required in the third invention are required in accordance with the fact that the received signals are multiplexed in the form of simultaneous timing. Of the plurality of timing generator circuits 303 required in the third invention, so that only one receiving PN generating circuit 500 is required.
Since only one timing generator circuit 504 is required, the frequency utilization efficiency can be improved with a smaller amount of hardware than the third invention.

In the fifth invention, the receiving PN generating circuit 500 is prepared in order to generate the spread spectrum code whose time direction is opposite. In the present invention whose principle configuration is shown in FIG. 6 (which may be hereinafter referred to as the sixth invention), the above-described M-sequence cyclic code has the property (the property that some of the time sequences have opposite directions). Use this for receiving P
This realizes omission of the N generation circuit 500.

FIG. 28 shows an embodiment of the sixth invention. As shown in this figure, the spread spectrum communication device 1 according to the sixth aspect of the present invention includes a plurality of PN generation circuits 600 provided for each channel, a correlator 601 including a SAW convolver or a matched filter, and a local oscillator 602. A multiplier 603, a timing generator circuit 604, a plurality of multipliers 605 provided for each channel, and a plurality of demodulation circuits 606 provided for each channel. For example, six PN generation circuits 600 are prepared in accordance with the M-series cyclic code used on the transmission side, and generate the six types of M-series cyclic codes shown in FIGS. 22 and 23. For example, the sixth PN generation circuit 600 generates an M-sequence cyclic code identified by (f).

Correlator 601 detects the correlation between the received signal and one of the cyclic codes of the M sequence generated by PN generation circuit 600, and generates a correlation match signal when detecting a correlation match. For example, the correlation match signal is generated when the correlation between the received signal and the cyclic code of the M sequence identified by (f) is detected and the correlation match is detected. The local oscillator 602 generates a carrier signal. Multiplier 603
Calculates the multiplication value of the carrier signal generated by the local oscillator 602 and the cyclic code of the M sequence to be input to the correlator 601, and inputs the calculated value to the correlator 601.

The timing generator circuit 604 is composed of, for example, a cyclic counter for performing a counting process for returning the count value to the original in the same cycle as the spread spectrum code as shown in FIG. 18, and outputs it from the correlator 601. A periodic signal synchronized with the correlation matching signal and having the same period as the correlation matching signal is generated.

Multiplier 605 is provided corresponding to PN generation circuit 600, and despreads the received signal using the M-sequence cyclic code generated by paired PN generation circuit 600.
The demodulation circuit 606 is provided so as to be associated with the multiplier 605, and demodulates the despread reception signal output from the paired multiplier 605.

In the spread spectrum communication device 1 of the sixth aspect of the invention configured as above, the correlator 601 correlates the received signal with one of the M-sequence cyclic codes generated by the PN generation circuit 600. Is detected, a correlation matching signal is generated when the correlation matching is detected, and it is output to the timing generator circuit 604. For example, by detecting the correlation between the received signal and the cyclic code of the M sequence identified by (f), the cyclic code of the M sequence identified by (f) included in the received signal and the time code The correlation coincidence signal is output by detecting the cyclic code of the M sequence identified by (e) whose direction is opposite.

Upon receiving this correlation coincidence signal, the timing generator circuit 604 has the following configuration.
A periodic signal that is synchronized with the correlation coincidence signal and has the same period as the correlation coincidence signal is generated, and is generated in all PN generation circuits 6
00, and in response to this, all PN generation circuits 60
0 generates M-sequence cyclic codes at the same timing in synchronization with the periodic signal.

Then, receiving this M-sequence cyclic code,
The paired multiplier 605 despreads the received signal using this M-sequence cyclic code, and the paired demodulation circuit 606 demodulates this despreaded received signal.

FIG. 29 shows a time chart of the sixth invention. Here, in this time chart,
The PN generation circuit 600 (PN 1) generated M-sequence cyclic code and the nth PN generation circuit 600 (PN
It is assumed that the direction of time is opposite to that of the M-sequence cyclic code generated in n).

As described above, in the spread spectrum communication device 1 of the sixth invention, the receiving PN generation circuit 500 required in the fifth invention is used by using the property of the cyclic code of the M sequence.
Since the above can be omitted, the frequency utilization efficiency can be improved with a smaller amount of hardware than that of the fifth invention.

Next, the present invention whose principle configuration is shown in FIG. 7 (hereinafter sometimes referred to as the seventh invention) will be described. The spread spectrum communication device 1 according to the seventh invention is
It receives and demodulates a spread spectrum received signal.

FIG. 30 shows an embodiment of the seventh invention. As shown in this figure, a spread spectrum communication device 1 according to a seventh aspect of the present invention includes a PLL synchronization acquisition mechanism 700 for acquiring synchronization with a received signal and performing despreading processing by using a PLL system, and a DLL system. , A DLL synchronization capturing mechanism 750 that captures synchronization with a received signal and performs despreading processing, a PN controller 800 that controls the PLL synchronization capturing mechanism 700 / DLL synchronization capturing mechanism 750, and a PL
A selection circuit 900 for selectively outputting either the output signal of the L synchronization acquisition mechanism 700 or the output signal of the DLL synchronization acquisition mechanism 750.

This PLL synchronization acquisition mechanism 700 includes a despreading PN generating circuit 701 and a receiving PN generating circuit 702.
A correlator 703, a VCO circuit 704, a PLL circuit 705, and a multiplier 706.

The despreading PN generation circuit 701 generates a despreading spread spectrum code. The reception PN generation circuit 702 receives the spread spectrum code (the time direction is opposite to that of the spread spectrum code for despreading).
Occurs. The correlator 703 is composed of a SAW convolver or a matched filter and detects the correlation between the received signal and the spread spectrum code generated by the receiving PN generating circuit 702.

The VCO circuit 704 is composed of a voltage controlled oscillator and controls the frequency of the spread spectrum code generation clock given to the despreading PN generation circuit 701.
The PLL circuit 705 controls the frequency control voltage given to the VCO circuit 704 by comparing the phase between the output clock of the VCO circuit 704 and the correlation coincidence signal detected by the correlator 703. The multiplier 706 despreads the received signal using the spread spectrum code generated by the despreading PN generation circuit 701.

On the other hand, the DLL synchronization acquisition mechanism 750 includes a despreading PN generation circuit 751, a first synchronization acquisition PN generation circuit 752, a first multiplier 753, and a second synchronization acquisition PN generation circuit. 754, the second multiplier 755, the difference calculator 756, the VCO circuit 757, and the DLL circuit 758.
And a despreading multiplier 759.

The despreading PN generating circuit 751 generates a despreading spread spectrum code. The first synchronization acquisition PN generation circuit 752 is a despreading PN generation circuit 75.
Generates a spread spectrum code that is one cycle ahead of the spread spectrum code generated by 1. The first multiplier 753 calculates a multiplication value of the received signal and the spread spectrum code generated by the first synchronization acquisition PN generation circuit 752.

The second synchronization acquisition PN generation circuit 754 is
It generates a spread spectrum code that is one cycle behind the spread spectrum code generated by the despreading PN generation circuit 751. The second multiplier 755 calculates a multiplication value of the received signal and the spread spectrum code generated by the second synchronization acquisition PN generation circuit 754.

The difference unit 756 calculates the difference value between the output signal of the first multiplier 753 and the output signal of the second multiplier 755. The VCO circuit 757 is composed of a voltage controlled oscillator and controls the frequency of a spread spectrum code generation clock given to the despreading PN generation circuit 751. DL
The L circuit 758 controls the frequency control voltage given to the VCO circuit 757 from the output signal of the difference unit 756. The despreading multiplier 759 despreads the received signal using the spread spectrum code generated by the despreading PN generation circuit 751.

In the spread spectrum communication device 1 of the seventh aspect of the invention configured as described above, the PN controller 800 is
Despreading PN generation circuit 701 / Reception PN generation circuit 70
The control is performed so that the 2 / despreading PN generation circuit 751 generates the spread spectrum code used on the transmitting side. When the despreading PN generation circuit 701 / the receiving PN generation circuit 702 / the despreading PN generation circuit 751 generates the M-sequence cyclic code as the spread spectrum code according to the circuit configuration shown in FIG. 21, the tap position This is done by switching.

In this way, the receiving PN generating circuit 70
When 2 starts to generate the spread spectrum code, the correlator 703 detects the correlation between the received signal and the spread spectrum code generated by the reception PN generation circuit 702,
When detecting a correlation match, a correlation match signal is generated and output to the PLL circuit 705 and the PN controller 800.

Upon receiving this correlation coincidence signal, the PN controller 800 causes the despreading PN generation circuit 701 / despreading PN generation circuit 751 to generate a spread spectrum code in synchronization with the correlation coincidence signal. To control. When the despreading PN generation circuit 701 / the despreading PN generation circuit 751 generates the M-sequence cyclic code as the spread spectrum code according to the circuit configuration shown in FIG. 21, by setting a corresponding initial value. Do this.

The PLL circuit 705 has the correlator 70
3 receives the correlation coincidence signal from No. 3 and compares the phase of the correlation coincidence signal with the output clock of the VCO circuit 704 to determine the voltage value for frequency control to be applied to the VCO circuit 704. VCO circuit 704 receives the de-spreading PN generation circuit 701.
In order to generate a spread spectrum code having the same frequency as the spread spectrum code used on the transmitting side, a clock is generated while controlling the frequency of the clock and given to the despreading PN generation circuit 701.

In this way, the despreading PN generation circuit 7
01 generates a spread spectrum code in a form including the frequency in synchronization with the spread spectrum code used on the transmission side. Therefore, the multiplier 706 causes the despreading PN generation circuit 7 to operate.
The received signal is despread using the spread spectrum code generated by 01.

On the other hand, according to the processing of the PN controller 800, when the despreading PN generation circuit 751 starts to generate the spread spectrum code in synchronization with the correlation coincidence signal detected by the correlator 703, the first synchronization acquisition PN is generated. The generation circuit 752 generates a spread spectrum code that is one cycle ahead of the spread spectrum code generated by the despreading PN generation circuit 751. In response to this, the first multiplier 753 outputs the received signal as a received signal. A multiplication value with the spread spectrum code generated by the first synchronization acquisition PN generating circuit 752 is calculated.

Also, the second synchronization acquisition PN generation circuit 75
4 generates a spread spectrum code which is delayed by one cycle from the spread spectrum code generated by the despreading PN generation circuit 751. In response to this, the second multiplier 7
55 is a received signal and a second synchronization capturing PN generation circuit 75
The multiplication value with the spread spectrum code generated by 4 is calculated.

The first and second multipliers 753 and 755
The subtractor 756 receives the processing of
Of the output signal of the second multiplier 755 and the output signal of the second multiplier 755 are calculated. Upon receiving this difference value, the DLL circuit 758 determines a voltage value for frequency control to be applied to the VCO circuit 757 from this difference value, receives the determined frequency control voltage, and receives the VCO circuit 757. Is to generate a clock while controlling the frequency of the clock so that the despreading PN generation circuit 751 will generate a spread spectrum code of the same frequency as the spread spectrum code used on the transmitting side. To the PN generation circuit 751 for use.

In this way, the despreading PN generation circuit 7
51 includes a frequency, and generates a spread spectrum code in synchronization with the spread spectrum code used on the transmitting side. Therefore, the despreading multiplier 759 causes the spectrum generated by the despreading PN generation circuit 751 to be generated. The spreading code is used to despread the received signal.

As described above, the PLL synchronization acquisition mechanism 700
Uses the PLL method to capture the synchronization with the received signal and perform the despreading process, and the DLL synchronization acquisition mechanism 750
The DLL system is used to capture the synchronization with the received signal and execute the despreading process.

As is well known, the PLL system is
The DLL system has a characteristic that the synchronization can be captured at a higher speed than the DLL system, and the DLL system has a characteristic that the captured synchronization can be held for a longer period than the PLL system.

In consideration of this characteristic, the selection circuit 900 first selects the output signal of the PLL synchronization acquisition mechanism 700, and thereafter, when the synchronization acquisition of the DLL synchronization acquisition mechanism 750 is completed, the DLL synchronization acquisition function is completed. The process of selecting the output signal of the mechanism 750 is performed.

Further, the DLL synchronization acquisition mechanism 750 uses the PN
According to the processing of the controller 800, when the despreading PN generation circuit 751 starts to generate the spread spectrum code in synchronization with the correlation coincidence signal detected by the correlator 703 as an initial state, the correlation coincidence signal is not used thereafter. .

When the selection circuit 900 starts the process of selecting the output signal of the DLL synchronization acquisition mechanism 750, the PN controller 800 starts the process of the next spread spectrum code used on the transmission side so that the PN for despreading. Generation circuit 7
The 01 / reception PN generation circuit 702 controls to generate the spread spectrum code, and in response to this, the PLL synchronization acquisition mechanism 750 can enter the synchronization acquisition of the spread spectrum code. By adopting this configuration, it is possible to perform parallel operations for synchronous acquisition.

As described above, in the spread spectrum communication device 1 of the seventh invention, the synchronization with the received signal is captured at high speed by using the PLL system, and the synchronization is accurately maintained for a long time by using the DLL system. Since the configuration is adopted, accurate demodulation processing can be realized.

At the time of realizing the seventh invention,
In the embodiment shown in FIG. 30, the PLL synchronization acquisition mechanism 700 is used, but the frequency of the spread spectrum code generated by the despreading PN generation circuit 701 / reception PN generation circuit 702 matches the transmission side with high accuracy. In the case of doing so, as shown in FIG.
It is also possible to adopt a configuration in which the circuit 704 / PLL circuit 705 is deleted.

[0182]

As described above, according to the present invention,
It becomes possible to realize a spread spectrum communication device that realizes improvement in frequency utilization efficiency while suppressing an increase in the amount of hardware. Then, it becomes possible to realize a spread spectrum communication device that realizes accurate demodulation processing.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram of the present invention.

FIG. 2 is a principle configuration diagram of the present invention.

FIG. 3 is a principle configuration diagram of the present invention.

FIG. 4 is a principle configuration diagram of the present invention.

FIG. 5 is a diagram illustrating the principle of the present invention;

FIG. 6 is a principle configurational diagram of the present invention.

FIG. 7 is a principle configurational diagram of the present invention.

FIG. 8 is an embodiment of the first invention.

FIG. 9 is an embodiment of the first invention.

FIG. 10 is an embodiment of the first invention.

FIG. 11 is an explanatory diagram of a clock signal / reset signal of a shift register.

FIG. 12 is an explanatory diagram of generating a spread spectrum code.

FIG. 13 is a time chart of the first invention.

FIG. 14 is an explanatory diagram of the second invention.

FIG. 15 shows an embodiment of the second invention.

FIG. 16 is a time chart of the second invention.

FIG. 17 is an example of the third invention.

FIG. 18 is an example of a timing generator circuit.

FIG. 19 is a time chart of the third invention.

FIG. 20 is a time chart of the third invention.

FIG. 21 is an explanatory diagram of generation of an M-sequence cyclic code.

FIG. 22 is an explanatory diagram of an M-sequence cyclic code.

FIG. 23 is an explanatory diagram of an M-sequence cyclic code.

FIG. 24 is an example of the fourth invention.

FIG. 25 is a time chart of the fourth invention.

FIG. 26 is an example of the fifth invention.

FIG. 27 is a time chart of the fifth invention.

FIG. 28 shows an example of the sixth invention.

FIG. 29 is a time chart of the sixth invention.

FIG. 30 is an example of the seventh invention.

FIG. 31 is another embodiment of the seventh invention.

FIG. 32 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 1 spread spectrum communication device 10 generating means 11 detecting means 12 indicating means 13 despreading means 14 spreading means 20 generating means 21 correlating means 22 extinction means 23 counter means 24 gate means 25 selecting means 30 first generating means 31 selecting means 32 correlation means Means 33 generation means 34 second generation means 35 despreading means 40 generation means 41 selection means 42 correlation means 43 generation means 44 despreading means 50 first generation means 51 second generation means 52 correlation means 53 generation means 54 reverse Spreading means 60 Generating means 61 Correlating means 62 Generating means 63 Despreading means 70 First control means 71 First despreading means 72 Second control means 73 Second despreading means 74 Selection means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masaki Arai, Inuki No. 98, Unoke-cho, Hebei-gun, Ishikawa Prefecture 2 PIEFU Co., Ltd. (72) Inventor Makoto Otani 98, Unoke-nu, Unoke-cho, Kawakita-gun, Ishikawa Prefecture Address No. 2 PF Corporation

Claims (16)

[Claims] 1. A spread spectrum communication device for receiving a spread spectrum received signal, having a function capable of generating a plurality of spread spectrum codes having different periodic patterns, and generating a specified spread spectrum code. Means (10), detecting the correlation between the received signal and the spread spectrum code generated by the generating means (10), and a detection means (11) for outputting that when the correlation coincidence is detected, and When the detection means (11) detects a correlation match, the generation means (10) is instructed to continuously generate the current spread spectrum code, and the detection means (11) detects a correlation mismatch. An instruction means (12) for instructing the generation means (10) to generate a spread spectrum code of another periodic pattern, and a spread spectrum code and a time generated by the generation means (10). That the orientation comprises an inverse diffusion means (13) for despreading the received signal using a spread spectrum code to be reversed, spread spectrum communication device according to claim. 2. A spread spectrum communication device which receives a spread spectrum received signal, has a function of generating a plurality of spread spectrum codes having different periodic patterns, and generates a spread spectrum code to be instructed. Means (10), detecting the correlation between the received signal and the spread spectrum code generated by the generating means (10), and a detection means (11) for outputting that when the correlation coincidence is detected, and When the detection means (11) detects a correlation mismatch, the generation means (10) is instructed to continuously generate the current spread spectrum code, and the detection means (11) detects a correlation match. In addition, an instruction means (12) for instructing the generation means (10) to generate a spread spectrum code of another periodic pattern, and a spread spectrum code generated by the generation means (10) are used. Further comprising a diffusion means for generating a transmission signal by spreading transmission data (14), spread spectrum communication device according to claim. 3. The spread spectrum communication device according to claim 1, wherein the instruction means (12) counts the periodic signal of the spread spectrum code, and the counter means according to the output signal of the detection means (11). And a issuing means for issuing a generation instruction of a spread spectrum code having a periodic pattern indicated by the count value of the counter means. Spread spectrum communication device. 4. A generating means (20) for generating a spread spectrum code and a correlation between a received signal and a spread spectrum code generated by the generating means (20) are detected, and when the correlation coincidence is detected, And a correlating means (21) for generating two correlation matching signals in one cycle of the spread spectrum code, and using the correlation matching signal detected by the correlation means (21), the spread spectrum received signal In a spread spectrum communication device for demodulation, an extinguishing means (22) for extinguishing a prescribed one of the two correlation coincidence signals generated by the correlating means (21) and a correlation not extinguished by the extinguishing means (22). When the coincidence signal is used as a reset signal, the counter means (23) for counting the clock signal, and when the count value of the counter means (23) reaches a specified value, the clock signal is input to the counter means (23). Gate means forbidden (2 4), and a spread spectrum communication device characterized by being configured to generate demodulated data from the output terminal of the counter means (23). 5. The spread spectrum communication device according to claim 4, wherein when the correlating means (21) outputs a positive / negative correlation matching signal in accordance with the primary modulation of the received signal, one of the correlation matching signals is output. Selection means to select the signal as valid (25)
A spread spectrum communication device characterized by comprising. 6. The spread spectrum communication device according to claim 4 or 5, wherein the extinguishing means (22) includes a comparing means for detecting whether or not the count value of the counter means (23) has reached a reference value. The detection means of the comparison means and the output signal of the correlation means (21) are input, and when the comparison means detects the unreached state, the gate means is configured to prohibit the passage of the output signal. Spread spectrum communication device. 7. A spread spectrum communication device for receiving a spread spectrum received signal, and a plurality of first generating means (30) for generating spread spectrum codes having different periodic patterns, and the first generating means (30). ) Is selected in order to select the spread spectrum code, and the correlation between the received signal and the spread spectrum code selected by the above selection means (31) is detected. Correlation means (32) for generating a correlation coincidence signal and the first generation means (30) are provided in association with each other, and are synchronized with the correlation coincidence signal output by the correlation means (32) and have the same period. A plurality of generating means for generating a periodic signal (33)
And the first generating means (30) paired with the first generating means (30) in synchronization with the periodic signal generated by the paired generating means (33). ), A plurality of second generating means (34) for generating a spread spectrum code whose time direction is opposite to the time direction of the spread spectrum code, and the second generating means (34) are provided in association with each other. A plurality of despreading means for despreading the received signal using the spread spectrum code generated by the second generating means (34) forming a pair
(35) A spread spectrum communication device comprising: 8. The spread spectrum communication device according to claim 7, wherein the selection means (31) cyclically selects the first generation means (30) and correlates the spread spectrum code generated by the selection means (30). A spread spectrum communication device characterized by inputting to 32). 9. In a spread spectrum communication device for receiving a spread spectrum received signal, a plurality of generating means (40) for generating cyclic codes of M sequences having different periodic patterns, and the generating means (40) are generated. When detecting the correlation between the selecting means (41) for sequentially selecting the M-sequence cyclic code and the received signal and the M-sequence cyclic code selected by the selecting means (41), when detecting the correlation coincidence Correlation means (42) for generating a correlation coincidence signal, and a periodic signal which is provided in association with the generation means (40), is synchronized with the correlation coincidence signal output by the correlation means (42), and has the same period. Generating means for generating the M-sequence cyclic code whose time direction is opposite to that of the M-sequence cyclic code generated by the pair of generating means (40).
By notifying (40), the above-mentioned generation means of the notification destination (40)
Is provided in association with the generating means (40) and the generating means (43) for controlling so as to generate an M-sequence cyclic code in synchronization with the periodic signal, and the generating means (40) forming a pair. And a plurality of despreading means (44) for despreading the received signal by using the M-sequence cyclic code generated by (1). 10. The spread spectrum communication device according to claim 9, wherein the selecting means (41) cyclically selects the generating means (40) and correlates the spread spectrum code generated thereby with the correlating means (4).
A spread spectrum communication device characterized by inputting to 2). 11. A spread spectrum communication device for receiving a spread spectrum received signal, and a plurality of first generating means (50) for generating spread spectrum codes having different periodic patterns, and the first generating means (50). Second generating means for generating a spread spectrum code whose time direction is opposite to that of one of the spread spectrum codes generated by
Correlation means (52) for detecting the correlation between the received signal and the spread spectrum code generated by the second generation means (51) and outputting a correlation coincidence signal when the correlation coincidence is detected. By generating a periodic signal having the same period in synchronization with the correlation coincidence signal output from the correlation means (52) and notifying the first generation means (50) of the periodic signal, A generating means (53) for controlling the first generating means (50) so as to generate a spread spectrum code in a form synchronized with the periodic signal, and the generating means (53) are provided in association with the first generating means (50). , A plurality of despreading means for despreading the received signal using the spread spectrum code generated by the first generating means (50) forming a pair
(54) A spread spectrum communication device comprising: 12. A spread spectrum communication device for receiving a spread spectrum received signal, wherein a plurality of generating means (60) for generating cyclic codes of M sequences having different periodic patterns including those having opposite time directions.
And the correlation signal between the received signal and one of the cyclic codes of the M sequence in which the direction of time generated by the generating means (60) is opposite, and the correlation matching signal is detected when the correlation matching is detected. And a correlating means (61) for outputting a periodic signal synchronized with the correlation coincidence signal output by the correlating means (61) and having the same period, and notifying the generating means (60) of the periodic signal. By so doing, the generating means (60) is provided so as to be associated with the generating means (62) and the generating means (62) for controlling the cyclic code of the M sequence to be generated in synchronization with the periodic signal. And a plurality of despreading means (63) for despreading the received signal using the cyclic code of the M sequence generated by the pair of generating means (60). 13. The method according to claim 7, 8, 9, 10, 11 or 1.
In the spread spectrum communication device according to 2, the generating means (33, 43, 53, 62) generates a periodic signal by using a counter that performs a counting process that restores the count value at the same period as the spread spectrum code. A spread spectrum communication device. 14. A spread spectrum communication device for receiving a spread spectrum received signal, having a function of generating a spread spectrum code for despreading, and correlating the received signal with the spread spectrum code for reception. First control means (70) for controlling the generation timing of the spread spectrum code for despreading by detecting
A first despreading means (71) for despreading a received signal using a despreading spread spectrum code generated by the first control means (70), and the first control means (70) And a function to generate a spread spectrum code for despreading independently of
According to the correlation detection result of the control means (70), while controlling the generation timing of the spread spectrum code for despreading,
Second control means (72) for controlling the frequency of the spread spectrum code for despreading according to the DLL system, and a received signal using the spread spectrum code for despreading generated by the second control means (72). Second despreading means (73) for despreading, and selection for selecting either the output signal of the first despreading means (71) or the output signal of the second despreading means (73) A spread spectrum communication device comprising: means (74). 15. The spread spectrum communication device according to claim 14, wherein the first control means (70) also controls the frequency of the spread spectrum code for despreading in accordance with the PLL system. Communication equipment. 16. The spread spectrum communication device according to claim 14 or 15, wherein the selection means (74) of the first control means (70) selects the output signal of the second despreading means (73). The spread spectrum communication device is characterized by performing processing so as to enter the next spread spectrum code synchronization acquisition processing.