JP3082472B2 - Wireless data repeater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless data repeater for performing wireless / infrared relay of data transmission between stations.

[0002]

2. Description of the Related Art In recent years, studies on wireless local area networks (LANs) have been actively conducted by the Telecommunications Technology Council of the Ministry of Posts and Telecommunications, and 2.4 for wireless LANs.
The frequency band of the GHz band is about to be opened. on the other hand,
At present, in the 2.4 GHz frequency band, there are strong radio waves leaking from microwave ovens and the like. Therefore, in an environment where wireless data transmission is performed using a frequency of the 2.4 GHz band in the vicinity where a microwave oven or the like is used, interference by unnecessary radiation from a microwave oven or the like becomes a problem. However, no countermeasure has been considered so far.

[0003]

The 2.4 GHz frequency band is about to be opened to wireless LANs, but the 2.4 GHz frequency band currently contains strong radio waves leaking from microwave ovens and the like. I do. Therefore, in an environment where wireless data transmission is performed using a frequency in the 2.4 GHz band in the vicinity where a microwave oven or the like is used, interference from unnecessary radiation such as a microwave oven becomes a problem.

[0004] The present invention has been made in view of the above problems, and has as its object to provide a wireless data repeater for configuring a wireless data transmission system that is resistant to interference from a microwave oven or the like.

[0005]

In order to achieve the above object, a wireless data repeater of the present invention comprises a receiving section, a decoding circuit for decoding a received signal, a memory for holding the decoded data, A modulation circuit that modulates data extracted from the memory, a transmission unit that outputs a modulation data signal, a solar cell that receives room illumination, a timing control circuit that connects to the solar cell, and a power unit, The timing control circuit controls the extraction of data from the memory and the output from the transmission unit.

[0006]

[Function] Unwanted radiation from a microwave oven or the like is output in synchronization with the cycle of an alternating current supplied from a power company.
In addition, there is a period during which no radio wave is output within one cycle. Hereinafter, this period is referred to as a 0 level period. The output of the solar cell that receives the indoor lighting is also synchronized with the cycle of the alternating current supplied from the power company. According to the present invention, with the above-described configuration, by providing the output of the solar cell that receives indoor illumination as an input signal to the timing control circuit, the timing control circuit can easily generate a control signal synchronized with the 0-level period. By using this control signal to control the timing of extracting data from the memory and transmitting data from the transmission unit, the wireless data repeater can transmit the wireless data signal in synchronization with the 0-level period. The transmission signal can be prevented from being disturbed by unnecessary radiation such as a microwave oven. Further, in the above-described configuration, the receiving section is constituted by the light receiving section and the light receiving signal amplifying circuit, and the data is transferred from the station to the wireless data repeater using infrared rays or the like. By using the 2.4 GHz band radio wave, it is possible to prevent both transmission and reception signals from being disturbed by unnecessary radiation such as a microwave oven.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A wireless data repeater according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a first embodiment of the present invention. 1, 7 are antennas, 2 is a high frequency circuit of a receiving unit, 3
Is a decoding circuit, 4 is a memory, 5 is a modulation circuit, 6 is a transmitter high-frequency circuit, 8 is a timing control circuit, 9 is a solar cell, 1
0 is a receiving unit, 11 is a transmitting unit, 12 is a relay unit, and 13 is a power unit. Note that the antenna 1 is connected to the receiving unit high-frequency circuit 2, and these are collectively referred to as a receiving unit 10. Also,
An antenna 7 is connected to the transmitting unit high-frequency circuit 6, and these are collectively referred to as a transmitting unit 11. Further, the reception unit 10, the decoding circuit 3, the memory 4, the modulation circuit 5, the transmission unit 12, and the timing control circuit 8 are collectively referred to as a relay unit 12. FIG.
5 is a configuration example of a timing control circuit 8. FIGS. 5C to 5E show the voltage waveforms in FIGS. 2C to 2E. In FIG. 2, reference numeral 8a denotes a waveform shaping circuit, 8b denotes a flip-flop circuit, and 8c denotes a control circuit. The operation of the first embodiment of the present invention will be described below with reference to FIGS. 1, 2 and 5.

In FIG. 1, a power unit 13 includes a relay unit 12.
Is supplied with power. The data signal from the station received by the antenna 1 passes through the high-frequency circuit 2 in the receiving section, is encoded by the decoding circuit 3, and is held in the memory 4. As shown in FIGS. 5A, 5B, and 5C, the output of the solar cell 9 that receives indoor lighting such as a fluorescent lamp that is not an inverter type is synchronized with unnecessary radiation such as a microwave oven. Therefore, the signal of FIG. 5C, which is the output of the solar cell 9, is input to the timing control circuit 8.

The operation of the timing control circuit 8 will be described below with reference to the block diagram of FIG. The solar cell 9 shown in FIG.
Is input to the waveform shaping circuit 8a, where the waveform-shaped signal is formed as shown in FIG. 5 (d) and sent to the flip-flop circuit 8b. If, for example, a D flip-flop is used as the flip-flop circuit 8b, a control signal (e) is output from the flip-flop circuit 8b. The control signal (e) is as shown in FIG. 5 (e), and FIGS. 5 (a) and 5 (b)
As can be understood by comparing with unnecessary radiation such as a microwave oven, one of the period in which unnecessary radiation is output and the zero-level period correspond to the high level and the low level of the control signal (e). Therefore, the control circuit 8c uses the control signal (e) to transmit the signal from the transmitting unit 1 shown in FIG.
1 controls the transmitting unit high-frequency circuit 6 and the memory 4 so that a data signal is output from the transmission unit 1. However, it is not known which output timing of the unnecessary radiation such as the microwave oven is one of FIGS. 5A and 5B. That is, the control signal (e)
It is not known which of the high and low levels corresponds to the 0 level period. Therefore, the control circuit 8c has a switch circuit therein, and as shown in FIG.
It is possible to switch at any time whether to output the data signal from the transmission unit 11 when the signal is at a high level or to output the data signal when the signal is at a low level as shown in FIG. In this way, the control signal always synchronized with the 0 level period from the timing control circuit 8 shown in FIG. 1 is sent to the memory 4 and the transmitting unit high frequency circuit 6. Upon receiving the control signal, the transmitting unit high-frequency circuit 6 is in a data transmittable state. A first-in first-out memory is used as the memory 4. When the memory 4 receives the control signal, the memory 4 sends the held data to the modulation circuit 5 and the data signal modulated by the modulation circuit 5 is in a transmittable state. The signal is output from the antenna 7 through the transmission unit high-frequency circuit 6. The solar cell 9 of FIG. 1 is used not only for generating a control signal but also for the relay unit 12.
Also used as a power source for

As described above, according to this embodiment, the wireless data repeater has a solar cell 9 for receiving indoor illumination, a data connection from the memory cell 4 to the solar cell 9, and a transmission unit 1.
By providing the timing control circuit 8 for controlling the output from 1, the burst data signal can be transmitted from the wireless data repeater during the 0-level period, and when transmitting from the wireless data repeater, interference due to unnecessary radiation such as a microwave oven occurs. Can be prevented. As an output signal of the control circuit 8c,
It is also possible to use a random access memory as the memory 4 by giving address information to the memory 4 in addition to the signal for capturing the timing of the 0 level.

FIG. 3 is a block diagram of a second embodiment of the present invention. In FIG. 3, the solar cell 9 and the power unit 13 of the wireless data repeater shown in FIG. 1 are constituted by one solar cell 9a. This configuration eliminates the need for a special power supply unit such as a power supply cable, and facilitates installation of the wireless data repeater.

FIG. 4 is a block diagram of a third embodiment of the present invention. In FIG. 4, 1a is a light receiving section, 2a is a light receiving signal amplifying circuit, and they are collectively referred to as a receiving section 10a.
In FIG. 4, the same reference numerals as those in FIG. 1 denote the same elements as those in FIG.

In this embodiment, a receiving section 10 composed of an antenna 1 and a receiving high-frequency circuit 2 in FIG.
And a receiving unit 10a composed of a light receiving signal amplifying circuit 2a. Hereinafter, the operation of the third embodiment of the present invention will be described with reference to FIG.

In FIG. 4, a light receiving section 1 for receiving infrared rays
The data signal from the station received at a is passed through a light-receiving signal amplifying circuit, encoded by a decoding circuit 3, and then stored in a memory 4.
Is held. Otherwise, the operation is the same as in the first embodiment. By doing so, the wireless data repeater of the third embodiment performs continuous data reception using infrared rays from another station on the reception side, and uses the 2.4 GHz band synchronized with the 0 level period on the transmission side. And wireless data transmission resistant to interference by unnecessary radiation such as a microwave oven in transmission and reception.

[0016]

According to the wireless data repeater, by providing a solar cell for receiving indoor illumination and a control circuit connected to the solar cell, unnecessary radiation such as a microwave oven is transmitted in data transmission using a 2.4 GHz band radio wave. It is possible to output a data signal in a burst form from the wireless data repeater during a period in which there is no interference due to. Furthermore, a light receiving unit and a light receiving signal amplifying circuit are provided in the receiving unit of the wireless data repeater, and infrared rays are used for receiving data from other stations, so that reception is not interrupted by a microwave oven or the like. Wireless data transmission can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention.

FIG. 2 is a block diagram of a control circuit in the embodiment.

FIG. 3 is a block diagram of a second embodiment of the present invention.

FIG. 4 is a block diagram of a third embodiment of the present invention.

FIG. 5 (a) is an unnecessary radiation output waveform diagram of a general microwave oven, (b) is an unnecessary radiation output waveform diagram of a general microwave oven, and (c) is an output voltage of a solar cell using indoor lighting as an energy source. Waveform diagram (d) is a voltage waveform diagram at arrow (d) shown in FIG. 2 (e) is a voltage waveform diagram at arrow (e) shown in FIG. 2 (f) is transmission data output timing of the embodiment of the present invention FIG. 7G is a transmission data output timing diagram according to the embodiment of the present invention.

[Explanation of symbols]

 1,7 antenna 1a light receiving unit 2 receiving unit high frequency circuit 2a light receiving signal amplifying circuit 3 decoding circuit 4 memory 5 modulation circuit 6 transmitting unit high frequency circuit 8 timing control circuit 8a waveform shaping circuit 8b flip-flop circuit 8c control circuit 9, 9a solar cell 10, 10a Receiving unit 11 Transmitting unit 12 Relay unit 13 Power unit

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Koji Kai 1006 Kazuma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-63-287121 (JP, A) JP-A-3-3 289223 (JP, A) JP-A-3-206739 (JP, A) JP-A-60-236334 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04B 7/14-7 / 26 102 H04Q 7/00-7/38

Claims (3)

(57) [Claims] An antenna for receiving data in a wireless data repeater interposed between stations of a data transmission system including a plurality of stations, such as a personal computer, a work station, and a repeater, for transmitting and receiving data wirelessly. A decoding circuit for decoding a received signal; a memory for holding the decoded data; a modulation circuit for modulating data extracted from the memory; a transmission high-frequency circuit and an antenna A transmission unit configured to output a data signal after modulation, a solar cell that receives indoor illumination, and a connection to the solar cell, extraction of data from the memory using an output of the solar cell, and transmission from the transmission unit. A timing control circuit that controls the output of the power supply, and a power unit that supplies power to each of the elements. Wireless data repeater characterized in that. 2. The solar cell according to claim 1, wherein said solar cell also serves as a power unit.
A wireless data repeater as described. 3. The wireless data repeater according to claim 1, wherein said receiving section comprises a light receiving section and a light receiving amplifier circuit.