JPH06338834A - Feeble radio wave communicating method - Google Patents

Abstract

PURPOSE:To obtain a communication method which saves power and is capable of preventing a wiretap without generating a radio wave fault by arranging plural feeble radio wave generation sources at a prescribed space and simultaneously transmitting the reception radio wave signals from other radio wave generation source at each radio wave generation source. CONSTITUTION:A transmission is performed by a feeble radio waves of 50MHz from a transmission main station 1. At a branch station 2, the radio waves of 50MHz of the transmission main station 1 is received, the signal is modulated to 52MHz and it is simultaneously transmitted. At a branch station 3, the radio waves of 52MHz of the branch station 2 is received, the signal is modulated to 54MHz and it is simultaneously transmitted. In the same way, the signal is modulated to 56MHz at a branch station 4, 58MHz at a branch station 5 and 60MHz at a branch station 6, respectively, and the signal is simultaneously transmitted. At a reception station 7, the signal of 60MHz is received. In this way, a communication can be performed. In this case, when the radio intensity at the distance of 3m from the generation source of a power source exceeds 1mV/m, this method is not preferable because the interference with other station and the fault to other communication system become conspicuous.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weak radio wave communication method in which a plurality of radio wave sources that generate weak radio waves form a system for communication, and generate weak radio waves that have not been conventionally used as unnecessary radio waves. The present invention relates to a method of utilizing effectively by communicating from the source at the same time.

[0002]

2. Description of the Related Art A conventional wireless communication method is generally a method of transmitting from one central station which generates a radio wave having a strong radio field intensity in the center. In addition, amplifiers were installed in various places to compensate for the attenuation of radio waves. Further, there are various restrictions in order to prevent interference between communication systems.

[0003]

As described above, it is necessary to generate a strong electric wave in the current communication method,
Therefore, on the other hand, the risk of interference increases between each communication system, and when trying to receive the weak radio wave of another station near a broadcasting station that is transmitting strong radio waves, reception failure may occur. There was a problem. On the other hand, various communication systems have been increasing year by year with the progress of the information age, and channel allocation has become a serious problem.
At present, there is a problem that further increase of broadcasting stations is difficult.

[0004]

The inventor has found that it is possible to provide a means for solving this problem by changing the way of thinking and making good use of weak radio waves which have not been used conventionally. That is, the present invention is 3 m from the radio wave source.
Communication is performed by arranging multiple sources of weak radio waves with a field strength of 1 mV / m or less at a specified distance at predetermined intervals, and transmitting radio signals from other radio sources to each radio source at the same time. Is a weak radio wave communication method. In the present invention, the radio wave generation source refers to something like a broadcasting station, which does not need to generate a strong radio wave as in the past, but transmits a weak radio wave. Then, another second station is arranged within a range where the radio wave transmitted by the first station can be received, and the second station modulates the communication signal of the received radio wave with a predetermined modulation and transmits the same weak radio wave. To do. The similar third, fourth, ... Stations are arranged and predetermined modulation is sequentially applied,
By constructing a system with a plurality of stations, it is possible to transmit a desired signal over a long distance. Here, the predetermined modulation includes frequency modulation, amplitude modulation, pulse width modulation, pulse code modulation, etc., and in order to prevent interference between adjacent stations, for example, the transmission frequency is sequentially changed. Refers to the operation. In the present invention, if the radio wave intensity at a distance of 3 m from the radio wave generation source exceeds 1 mV / m, interference with other stations and interference with other communication systems become significant, which is not preferable. For the plurality of stations in the present invention, it suffices to install a small radio in one corner of a convenience store, a store, a public building, or the like. Each station receives the target radio wave, modulates that signal into another radio wave, and transmits it as a weak radio wave, so it does not emit radio waves to the unnecessary range.
It becomes possible to transmit to the target receiving station. Therefore, according to the communication method of the present invention, a LAN can be installed with simple equipment.
(Local area network) can be built. Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to the examples.

[0005]

Embodiments will be described with reference to FIG. 50 from transmitting head office 1
It transmits with a weak radio wave of MHz. The substation 2 receives the radio wave of the main station 1 of 50 MHz, modulates the signal to 52 MHz, and transmits it at the same time. The branch station 3 receives the radio wave of the branch station 2 of 52 MHz, modulates the signal to 54 MHz, and transmits it simultaneously. Similarly, the branch 4 modulates to 56 MHz, the branch 5 to 58 MHz, and the branch 6 to 60 MHz for simultaneous transmission. The receiving station 7 receives the 60 MHz signal. Communication can be performed in this way. In the above embodiment, the transmitting main station 1 and the receiving station 7 are also fixed stations, but the receiving station 7 receives all the radio waves of 50, 52, 54, 56, 58 and 60 MHz and has the highest reception intensity. By receiving the signal, the receiving station 7 is set as a mobile station.
It is possible to receive within the entire range from 16 to 16. Further, even if the transmission main station 1 is a mobile station, the branch stations 3 to 6 simultaneously receive the respective reception frequencies and the 50 MHz signal of the transmission main station 1 and modulate the signals having high reception signals into the respective reception signals. The main station 1 transmits 50MHz
If branch 2 is 52 MHz, branch 3 is 54 MHz, branch 4 is 56 MHz, branch 5 is 52 MHz, branch 6
If it transmits at 54 MHz, the transmission frequency band will not spread even if a large number of branch offices are arranged and long-distance communication is performed.
Communication is possible at three frequencies of 4,56 MHz.
In the above embodiment, the branch offices 11 and 12 and 1 are used to prevent interference.
Since there is a range in which the receivable range is triple, such as 3, the transmission frequency of the branch station was configured with three or more frequencies, but, for example, the distance between stations was devised so as not to interfere even with a single frequency. Alternatively, there is no need to separate frequencies in applications where there is no practical problem even if there is a primary communication failure during movement. Here, the modulation method of the transmission radio wave can be appropriately selected according to the purpose, such as amplitude modulation, frequency modulation, pulse width modulation, or the like. Although the branch offices are arranged on a straight line in FIG. 1, they can be arranged on a non-straight line according to the terrain, along with the building, or appropriately arranged according to the purpose. Further, the communication method according to the present invention can be combined with wired communication, microwave communication, satellite communication, or the like for communication. Furthermore, even if communication failure occurs due to a failure of a certain branch office, if a large number of branch offices are arranged so that two adjacent radio waves can be received as shown in FIG. 2, even if the branch office 4 fails, the branch offices 3 and Since there is a receivable distance between the mobile terminal 5 and the mobile terminal 5, communication can be prevented. In addition, it is possible to determine a failed branch by transmitting not only the transmission signal but also the branch identification code signal. If each branch office is configured to automatically turn on the radio wave of the receiving section when the target radio wave is received, if the communication from the main station 1 is stopped when communication is unnecessary, To stop the transmission power of the branch office,
This can be done by remote control from the transmitting main station 1. According to the method of the present invention, the signal to be modulated can be modulated not only into an analog signal but also into a digital signal. Also,
By increasing the transmission radio wave band instead of 50 MHz, it is possible to communicate a large amount of data in a short time as in the case of the free visit method. Further, according to the present invention, the branch offices 11 to 1
Since it cannot be received by the receiving station 8 outside the range of 6, no eavesdropping will occur and no radio interference will occur.
In addition, it is possible to save power because it is sufficient to transmit only to the necessary range.

[0006]

According to the present invention, it is possible to provide a power-saving communication method which does not cause radio wave interference by weak radio waves and can prevent eavesdropping.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a difference between an embodiment of a communication method according to the present invention and a conventional method.

FIG. 2 is a diagram illustrating another embodiment of the present invention.

[Explanation of symbols]

1 Sending head office 2, 3, 4, 5, 6 Branch office
7,8 Receiving station 11,12,13,14,15,16 Radio wave receivable range of each of stations 1 to 21 21 Radio wave receivable range of the transmitting main station 1 of the conventional method.

Claims (1)

[Claims] 1. A plurality of weak radio wave sources having a radio field intensity of 1 mV / m or less at a distance of 3 m from the radio wave source are arranged at predetermined intervals, and each radio wave source receives radio waves from other radio wave sources. A weak radio wave communication method characterized in that communication is performed by simultaneously transmitting signals.