Radio information communication system using multi-carrier spread spectrum transmission system
First Claim
1. A radio information communication system for transmitting data between a plurality of radio stations via a radio transmission path, characterized in that;
- said radio station comprises;
dividing means for dividing at least part of a transmission data string into a plurality of bit strings and outputting the same;
primary modulation means for performing (primary modulation on) a plurality of first carrier signals of different frequencies based on the plurality of bit strings output from said dividing means;
secondary modulation means having receiving means for receiving a hopping synchronization signal periodically transmitted from another radio station and containing information representing at least the hopping timing, for performing (secondary modulation on) the plurality of first carrier signals modulated by said primary modulation means by a frequency hopping system according to the hopping synchronization signal received by said receiving means and outputting a plurality of second carrier signals performed to the secondary modulation;
transmission means for transmitting the plurality of second carrier signals output from said secondary modulation means to said radio transmission path in parallel; and
hopping window setting means for setting a frequency hopping window in a preset period including a reception period of the hopping synchronization signal and the hopping timing and interrupting transmission of the second carrier signal in a period in which said frequency hopping window is set.
1 Assignment
0 Petitions
Accused Products
Abstract
In a radio information communication system of this invention, at least part of a transmission data string is first divided into a plurality of bit strings when data is transmitted by radio in a radio station on the transmission side and a plurality of carrier waves of different frequencies are subjected to primary modulation by the divided bit strings. Then, the primary-modulated carrier waves are subjected to secondary modulation by the spread spectrum system such as the frequency hopping system or chirp system and modulated waves obtained by the secondary modulation are transmitted.
47 Citations
21 Claims
-
1. A radio information communication system for transmitting data between a plurality of radio stations via a radio transmission path, characterized in that;
-
said radio station comprises; dividing means for dividing at least part of a transmission data string into a plurality of bit strings and outputting the same; primary modulation means for performing (primary modulation on) a plurality of first carrier signals of different frequencies based on the plurality of bit strings output from said dividing means; secondary modulation means having receiving means for receiving a hopping synchronization signal periodically transmitted from another radio station and containing information representing at least the hopping timing, for performing (secondary modulation on) the plurality of first carrier signals modulated by said primary modulation means by a frequency hopping system according to the hopping synchronization signal received by said receiving means and outputting a plurality of second carrier signals performed to the secondary modulation; transmission means for transmitting the plurality of second carrier signals output from said secondary modulation means to said radio transmission path in parallel; and hopping window setting means for setting a frequency hopping window in a preset period including a reception period of the hopping synchronization signal and the hopping timing and interrupting transmission of the second carrier signal in a period in which said frequency hopping window is set.
-
-
2. A radio information communication system for transmitting data between a plurality of radio stations via a radio transmission path, characterized in that;
-
said radio station comprises; dividing means for dividing at least part of a transmission data string into a plurality of bit strings and outputting the same; primary modulation means for performing (primary modulation on) a plurality of first carrier signals of different frequencies based on the plurality of bit strings output from said dividing means; secondary modulation means having receiving means for receiving a sweep synchronization signal periodically transmitted from another radio station and containing information representing at least the sweep switching timing, for performing (secondary modulation on) the plurality of first carrier signals modulated by said primary modulation means by a chirp system according to the sweep synchronization signal received by said receiving means and outputting a plurality of second carrier signals performed to the secondary modulation; and transmission means for transmitting the plurality of second carrier signals output from said secondary modulation means to said radio transmission path in parallel.
-
-
3. A radio information communication system for transmitting data between a plurality of radio stations via a radio transmission path, characterized in that;
said radio station comprises; dividing means for dividing at least part of a transmission data string into a plurality of bit strings and outputting the same; primary modulation means for performing (primary modulation on) a plurality of first carrier signals of different frequencies based on the plurality of bit strings output from said dividing means; secondary modulation means having receiving means for receiving a sweep synchronization signal periodically transmitted from another radio station and containing information representing at least the sweep switching timing, for performing (secondary modulation) on the plurality of first carrier signals modulated by said primary modulation means by a chirp system according to the sweep synchronization signal received by said receiving means and outputting a plurality of second carrier signals performed to the secondary modulation; and transmission means for transmitting the plurality of second carrier signals output from said secondary modulation means to said radio transmission path in parallel; and means for independently and periodically generating and transmitting a sweep synchronization signal when the sweep synchronization signal is not received by said receiving means for a preset consecutive period of time.
-
4. A radio information communication system for transmitting data between a plurality of radio stations via a radio transmission path, characterized in that;
said radio station comprises; dividing means for dividing at least part of a transmission data string into a plurality of bit strings and outputting the same; primary modulation means for performing (primary modulation on) a plurality of first carrier signals of different frequencies based on the plurality of bit strings output from said dividing means; secondary modulation means having receiving means for receiving a sweep synchronization signal periodically transmitted from another radio station and containing information representing at least the sweep switching timing, for performed (secondary modulation on) the plurality of first carrier signals modulated by said primary modulation means by a chirp system according to the sweep synchronization signal received by said receiving means and outputting a plurality of second carrier signals performed to the secondary modulation; and transmission means for transmitting the plurality of second carrier signals output from said secondary modulation means to said radio transmission path in parallel; and chirp window setting means for setting a chirp window in a preset period including a reception period of the sweep synchronization signal and the sweep switching timing and interrupting transmission of the second carrier signal in a period in which said chirp window is set.
-
5. A radio information communication system for transmitting data between a plurality of radio stations via a radio transmission path, characterized in that;
said radio station comprises; dividing means for dividing at least part of a transmission data string into a plurality of bit strings and outputting the same; address inserting means for inserting the entire information of at least address information among the transmission data string into the plurality of bit strings output from said dividing means; primary modulation means for performing (primary modulation on) a plurality of first carrier signals of different frequencies based on the plurality of bit strings into which the entire information of the address information is inserted by said address inserting means; secondary modulation means for performing (secondary modulation on) the plurality of first carrier signals modulated by said primary modulation means by a spread spectrum system and outputting a plurality of second carrier signals; and transmission means for transmitting the plurality of second carrier signals output from said secondary modulation means to said radio transmission path in parallel.
-
6. A radio information communication system for transmitting data between a plurality of radio stations via a radio transmission path, characterized in that;
said radio station comprises; dividing means for dividing at least part of a transmission data string into a plurality of bit strings and outputting the same; address inserting means for inserting at least address information of the transmission data string into a plurality of portions of at least one bit string output from said dividing means; primary modulation means for performing (primary modulation on) a plurality of first carrier signals of different frequencies based on said plurality of bit strings including said bit string into which the address information is inserted by said address inserting means; secondary modulation means for performing (secondary modulation on) the plurality of first carrier signals modulated by said primary modulation means by a spread spectrum system and outputting a plurality of second carrier signals; and transmission means for transmitting the plurality of second carrier signals output from said secondary modulation means to said radio transmission path in parallel.
-
7. A radio information communication system for transmitting data between a plurality of radio stations via a radio transmission path, characterized in that;
said radio station comprises; dividing means for dividing at least part of a transmission data string into a plurality of bit strings and outputting the same; error correction signal creating means for creating and outputting a new bit string containing an error correction signal based on at least one bit string among the plurality of bit strings output from said dividing means; error detection signal adding means for adding error detection signals to the new bit string containing the error correction signal output from said error correction signal creating means and the plurality of bit strings output from said dividing means and outputting them; primary modulation means for performing (primary modulation on) a plurality of first carrier signals of different frequencies based on the plurality of bit strings output from said error detection signal adding means; secondary modulation means for performing (secondary modulation on) the plurality of first carrier signals modulated by said primary modulation means by a spread spectrum system and outputting a plurality of second carrier signals; transmission means for transmitting the plurality of second carrier signals output from said secondary modulation means to said radio transmission path in parallel; receiving means for receiving the plurality of second carrier signals of different frequencies transmitted from another radio station via said radio transmission path; secondary demodulation means for performing (secondary demodulation on) the plurality of second carrier signals received by said receiving means in synchronism with the secondary modulating operation by said secondary modulation means of said another radio station and outputting the plurality of first carrier signals; primary demodulation means for performing (primary demodulation on) the plurality of first carrier signals output from said secondary demodulation means and outputting a plurality of reception bit strings of base band; error detection means for detecting a bit error based on an error detection signal contained in the reception bit string for each of the plurality of reception bit strings output from said primary demodulation means; error correction means for correcting an error of the bit string in which the bit error is detected by said error detection means based on a bit string among said plurality of reception bit strings which contains an error correction signal and then outputting the same; and synthesizing means for combining together the plurality of reception bit strings output from said error correction means to reproduce the received data string.
-
8. A radio information communication system for transmitting data between a plurality of radio stations via a radio transmission path, characterized in that;
-
said radio station comprises; dividing means for dividing at least part of a transmission data string into a plurality of bit strings and outputting the same; first error correction signal creating means for creating and outputting a new bit string containing a first error correction signal based on at least one bit string among the plurality of bit strings output from said dividing means; second error correction signal creating means for adding second error correction signals to the new bit string containing the first error correction signal output from said first error correction signal creating means and the plurality of bit strings output from said dividing means and outputting them; primary modulation means for performing (primary modulation on) a plurality of first carrier signals of different frequencies based on the plurality of bit strings output from said second error detection signal adding means; secondary modulation means for performing (secondary modulation on) the plurality of first carrier signals modulated by said primary modulation means by a spread spectrum system and outputting a plurality of second carrier signals; transmission means for transmitting the plurality of second carrier signals output from said secondary modulation means to said radio transmission path in parallel; receiving means for receiving the plurality of second carrier signals of different frequencies transmitted from another radio station via said radio transmission path; secondary demodulation means for performing (secondary demodulation on) the plurality of second carrier signals received by said receiving means in synchronism with the secondary modulating operation by said secondary modulation means of said another radio station and outputting the plurality of first carrier signals; primary demodulation means for performing (primary demodulation on) the plurality of first carrier signals output from said secondary demodulation means and outputting a plurality of reception bit strings of base band; first error correction means for correcting a bit error based on a second error detection signal contained in the reception bit string for each of the plurality of reception bit strings output from said primary demodulation means; second error correction means for correcting an error of the reception bit string in which an error remains when the error remains in the result of error correction by said first error correction means based on a reception bit string among said plurality of reception bit strings which contains a first error correction signal and then outputting the same; and synthesizing means for combining together the plurality of reception bit strings output from said second error correction means to reproduce the received data string.
-
-
9. An error correction method used in a system for transmitting communication data between a plurality of radio stations by dividing at least part of a transmission data string into a plurality of bit strings and modulating a plurality of carrier frequencies by the bit strings, characterized in that said error correction method comprises:
-
a step of creating and outputting a new bit string containing an error correction signal based on at least one bit string among said plurality of bit strings in the radio station which transmits the communication data; a step of adding error detection signals to the new bit string containing the error correction signal and said plurality of bit strings in the radio station which transmits the communication data; a step of detecting a bit error based on an error detection signal contained in the reception bit string for each of a plurality of modulated reception bit strings in the radio station which has received the transmission data; and a step of correcting an error of the reception bit string in which the bit error is detected based on the error detection signal according to that bit string of said plurality of reception bit strings which contains the error correction signal in the radio station which has received the transmission data.
-
-
10. An error correction method used in a system for transmitting communication data between a plurality of radio stations by dividing at least part of a transmission data string into a plurality of bit strings and modulating a plurality of carrier frequencies by the bit strings, characterized in that said error correction method comprises:
-
a step of creating a new bit string containing a first error correction signal based on at least one bit string among said plurality of bit strings in the radio station which transmits the communication data; a step of adding second error detection signals to the new bit string containing the first error correction signal and said plurality of bit strings in the radio station which transmits the communication data; a step of correcting a bit error based on the second error detection signal contained in the reception bit string for each of a plurality of modulated reception bit strings in the radio station which has received the transmission data; and a step of correcting an error of a reception bit string in which an error remains when the error remains in the result of error correction based on said second error detection signal according to that reception bit string of said plurality of reception bit strings which contains the second error correction signal in the radio station which has received the transmission data.
-
-
11. A radio information communication system for transmitting data between a plurality of radio stations via a radio transmission path, characterized in that;
said radio station comprises; dividing means for dividing at least part of a transmission data string into a plurality of bit strings and outputting the same; collision detection signal adding means for adding a plurality of collision detection pulses at random timings to a first period of the head end of the plurality of bit strings output from said dividing means; primary modulation means for performing (primary modulation on) a plurality of first carrier signals of different frequencies based on the plurality of bit strings output from said collision detection signal adding means; secondary modulation means for performing (secondary modulation on) the plurality of first carrier signals modulated by said primary modulation means by a spread spectrum system and outputting a plurality of second carrier signals; transmission means for transmitting the plurality of second carrier signals output from said secondary modulation means to said radio transmission path in parallel; receiving means for receiving the plurality of second carrier signals of different frequencies transmitted from another radio station via said radio transmission path; secondary demodulation means for performing (secondary demodulation on) the plurality of second carrier signals received by said receiving means in synchronism with the secondary modulating operation by said secondary modulation means of said another radio station and outputting a plurality of first carrier signals; primary demodulation means for performing (primary demodulation on) the plurality of first carrier signals output from said secondary demodulation means and outputting a plurality of reception bit strings of base band; determining means for determining whether a signal other than a collision detection signal transmitted by itself is contained in a second period including the first period of the head end of the plurality of reception bit strings output from said primary demodulation means; and synthesizing means for combining together the plurality of reception bit strings output from said primary demodulating means to reproduce the received data string.
-
12. A signal collision detection method used in a system for transmitting a transmission signal between a plurality of radio stations via a radio transmission path, characterized in that said signal collision detection method comprises:
-
a step of permitting that radio station among said plurality of radio stations which requests transmission of communication data to transmit a plurality of collision detection pulses at random timings in a preset first period prior to transmission of the communication signal; a step of permitting the radio station which requests transmission of the communication signal to determine whether or not reception of a collision detection signal other than the collision detection signal transmitted by itself occurs in a second period including the first period; and a step of detecting collision of a signal in said radio transmission path based on the determination result in said step. - View Dependent Claims (13)
-
-
14. A signal collision detection method used in a system for transmitting a transmission signal between a plurality of radio stations via a radio transmission path, characterized in that said signal collision detection method comprises:
-
a step of permitting that radio station among said plurality of radio stations which requests transmission of communication data to generate and transmit a collision detection signal constructed by a preset number of random pulse trains in a preset first period prior to transmission of the communication signal; a step of permitting the radio station which does not request transmission of the communication signal to determine whether pulses of a number exceeding said preset number have received or not in a second period including the first period; and a step of detecting collision of a signal in said radio transmission path based on the determination result in said step.
-
-
15. A radio information communication system for transmitting data between a plurality of radio stations via a radio transmission path, characterized in that;
said radio station comprises; dividing means for dividing at least part of a transmission data string into a plurality of bit strings and outputting the same; address inserting means for inserting the entire information of at least address information among the transmission data string into the plurality of bit strings output from said dividing means; primary modulation means for performing (primary modulation on) a plurality of first carrier signals of different frequencies based on the plurality of bit strings into which the entire information of the address information is inserted by said address inserting means; and transmission means for transmitting the plurality of first carrier signals output from said primary modulation means to said radio transmission path in parallel.
-
16. A radio information communication system for transmitting data between a plurality of radio stations via a radio transmission path, characterized in that;
said radio station comprises; dividing means for dividing at least part of a transmission data string into a plurality of bit strings and outputting the same; address inserting means for inserting at least address information of the transmission data string into a plurality of portions of at least one bit string output from said dividing means; primary modulation means for performing (primary modulation on) a plurality of first carrier signals of different frequencies based on said plurality of bit strings including the bit string into which the address information is inserted by said address inserting means; and transmission means for transmitting the plurality of first carrier signals output from said primary modulation means to said radio transmission path in parallel.
-
17. A radio information communication system for transmitting data between a plurality of radio stations via a radio transmission path, characterized in that;
said radio station comprises; dividing means for dividing at least part of a transmission data string into a plurality of bit strings and outputting the same; error correction signal creating means for creating and outputting a new bit string containing an error correction signal based on at least one bit string among the plurality of bit strings output from said dividing means; error detection signal adding means for adding error detection signals to the new bit string containing the error correction signal output from said error correction signal creating means and the plurality of bit strings output from said dividing means and then outputting them; primary modulation means for performing (primary modulation on) a plurality of first carrier signals of different frequencies based on the plurality of bit strings output from said error detection signal adding means; and transmission means for transmitting the plurality of first carrier signals modulated by said primary modulation means to said radio transmission path in parallel.
-
18. A radio information communication system for transmitting data between a plurality of radio stations via a radio transmission path, characterized in that;
said radio station comprises; dividing means for dividing at least part of a transmission data string into a plurality of bit strings and outputting the same; first error correction signal creating means for creating and outputting a new bit string containing a first error correction signal based on at least one bit string among the plurality of bit strings output from said dividing means; second error correction signal creating means for adding second error detection signals to the new bit string containing the first error correction signal output from said first error correction signal creating means and the plurality of bit strings output from said dividing means and outputting them; primary modulation means for performing (primary modulation on) a plurality of first carrier signals of different frequencies based on the plurality of bit strings output from said second error detection signal adding means; and transmission means for transmitting the plurality of first carrier signals modulated by said primary modulation means to said radio transmission path in parallel.
-
19. A radio information communication system for transmitting data between a plurality of radio stations via a radio transmission path, characterized in that;
said radio station comprises; dividing means for dividing at least part of a transmission data string into a plurality of bit strings and outputting the same; error correction signal creating means for creating and outputting a new bit string containing an error correction signal based on at least one bit string among the plurality of bit strings output from said dividing means; error detection signal adding means for adding error detection signals to the new bit string containing the error correction signal output from said error correction signal creating means and the plurality of bit strings output from said dividing means and outputting them; primary modulation means for performing (primary modulation on) a plurality of first carrier signals of different frequencies based on the plurality of bit strings output from said error detection signal adding means; transmission means for transmitting the plurality of first carrier signals output from said primary modulation means to said radio transmission path in parallel; receiving means for receiving the plurality of first carrier signals of different frequencies transmitted from another radio station via said radio transmission path; primary demodulation means for performing (primary demodulation on) the plurality of first carrier signals received by said receiving means and outputting a plurality of reception bit strings of base band; error detection means for detecting a bit error based on an error detection signal contained in the reception bit string for each of the plurality of reception bit strings output from said primary demodulation means; error correction means for correcting an error of a bit string in which a bit error is detected by said error detection means based on a bit string among said plurality of reception bit strings which contains an error correction signal and then outputting the same; and synthesizing means for combining together the plurality of reception bit strings output from said error correction means to reproduce the received data string.
-
20. A radio information communication system for transmitting data between a plurality of radio stations via a radio transmission path, characterized in that;
said radio station comprises; dividing means for dividing at least part of a transmission data string into a plurality of bit strings and outputting the same; first error correction signal creating means for creating and outputting a new bit string containing a first error correction signal based on at least one bit string among the plurality of bit strings output from said dividing means; second error correction signal creating means for adding second error detection signals to the new bit string containing the error correction signal output from said first error correction signal creating means and the plurality of bit strings output from said dividing means and outputting them; primary modulation means for performing (primary modulation on) a plurality of first carrier signals of different frequencies based on the plurality of bit strings output from said second error detection signal adding means; transmission means for transmitting the plurality of first carrier signals output from said primary modulation means to said radio transmission path in parallel; receiving means for receiving the plurality of first carrier signals of different frequencies transmitted from another radio station via said radio transmission path; primary demodulation means for performing (primary demodulation on) the plurality of first carrier signals received by said receiving means and outputting a plurality of reception bit strings of base band; first error correction means for correcting a bit error based on a second error correction signal contained in the reception bit string for each of the plurality of reception bit strings output from said primary demodulation means; second error correction means for correcting an error of a bit string in which a bit error remains when the error remains in the result of error correction by said first error correction means based on a reception bit string among said plurality of reception bit strings which contains a first error correction signal and then outputting the same; and synthesizing means for combining together the plurality of reception bit strings output from said second error correction means to reproduce the received data string.
-
21. A radio information communication system for transmitting data between a plurality of radio stations via a radio transmission path, characterized in that;
said radio station comprises; dividing means for dividing at least part of a transmission data string into a plurality of bit strings and outputting the same; collision detection signal adding means for adding a plurality of collision detection pulses at random timings to a first period of the head end of the plurality of bit strings output from said dividing means; primary modulation means for performing (primary modulation on) a plurality of first carrier signals of different frequencies based on the plurality of bit strings output from said collision detection signal adding means; transmission means for transmitting the plurality of first carrier signals modulated by said primary modulation means to said radio transmission path in parallel; receiving means for receiving the plurality of first carrier signals of different frequencies transmitted from another radio station via said radio transmission path; primary demodulation means for performing (primary demodulation on) the plurality of first carrier signals received by said receiving means and outputting a plurality of reception bit strings of base band; determining means for determining whether or not a signal other than the collision detection signal transmitted by itself exists in a second period including the first period of the head end of the plurality of reception bit strings output from said primary demodulation means; and synthesizing means for combining together the plurality of reception bit strings output from said primary demodulation means to reproduce the received data string.
Specification