JPH03177123A - Channel selecting system for radio communication equipment - Google Patents

Abstract

PURPOSE:To prevent a noise due to fading, etc., by selecting an optimum channel by comparing mutually the received electric field level of each channel before a circuit is connected. CONSTITUTION:At the time of channel monitoring before the connection of the radio circuit, for instance, at the time of the installation of radio equipment, or at optional time before the start of use, after confirming that no interfering wave is present thereon, the carrier signals of the same level are transmitted from a transmitter A successively while changing the channel. Then, at a receiver B, the noise level of the transmission signal and the carrier receiving level are detected by a received electric field level detecting part 9 at every channel, and those are stored together with a channel number. Next, the received levels are compared respectively by a comparison part 10 by changing the channel successively, and the channel numbers whose noise levels are sufficiently low are stored in a storage part 11 in the decending order of the carrier received level. Then, at the time the communication, after confirming again that no interfering wave is present thereon, the optimum channel of the high received level stored in the storage part 11 is selected. Thus, the noise due to the fading, etc., can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wireless communication device that uses a plurality of channels, and particularly relates to a wireless communication device that selects an optimal channel during communication.
This relates to the channel selection method of the machine.

[Conventional technology]

Conventionally, this type of wireless trace using multiple channels 1;
In the receiver, a level detection circuit for detecting the electric field level of the receiver 3 is provided on the receiver side in order to select the fastest channel. Then, the electric field level of the received signal is compared with a certain threshold value, and if the reception level is higher than a certain threshold value in the absence of interference waves, it is determined that the wireless line of that channel can be used.

(Three problems to be solved by the invention) The conventional channel selection method for wireless communication equipment determines whether or not a channel can be used by simply comparing the electric field level of the received signal with a certain threshold value, as described above. Because I am making a judgment,
There is a problem in that it is not possible to use the best channel among a plurality of channels, and there is a problem in that noise due to fading etc. may occur on lines with channels with poor radio wave conditions.

The present invention has been made in view of these problems.It is an object of the present invention to provide a channel selection method for a wireless communication device that can always use the best channel and can prevent noise due to fading and the like. It is an object.

[T stage for solving problem a]

j of this invention! ! The channel selection method of LaA communication equipment uses a number of channels and is equipped with a level detection circuit on the receiving side to detect the electric field level of the received signal. This system is equipped with a wireless receiver, and compares the reception level of each channel before establishing a wireless line-of-sight connection to select the optimal channel for communication.

[0 River] In the channel selection method of the wireless communication device of this invention,
Before connecting the 11+l line, compare the receiving A and MI electric W levels of each channel with each other, and the results are YES! It selects the optimal channel at the time, so you can always choose the channel you want to sleep on.

〔Example〕

No. 11m has a configuration 1 showing a failed embodiment of the present invention, and It'4.; shows a schematic configuration of a wireless communication device.

1 (a) shows the circuit configuration of the feed delta machine A, and 1 in the figure
2 is a data input section where the data to be transmitted is manually input; 2 is a transmission section that transmits the data as a radio wave (No. 3) from an antenna 3; 4 is a channel control section that controls the connection of the wireless line. Figure 1(b) shows the circuit configuration of the receiver 3 unit B, in which 5 is the receiver 3 part that receives the data sent by the receiver 3 from the antenna 6, and 7 is the receiver 3 part that outputs the data to the outside. 8 is a channel control unit that controls the connection of the wireless line; 9 is a received electric field level detection unit equipped with 10 level detection ports for detecting the electric field level of the received signal; 10 is a received electric field level detector for each detected channel; A comparator section 11 includes a comparator for comparing electric field levels with each other, and a storage section 11 stores the reception level of each channel.

Next, the operation of the wireless communication device having the above configuration will be explained.

First, when installing the channel monitor I1.1F before wireless line-of-sight connection, for example, when installing a wireless communication device or preparing it before starting use, confirm that there are no interference waves, and then transmit a carrier wave signal of the same level from transmitter A. Transmit while changing the ship channel. Then, in the receiver B, the noise level and carrier reception level of the signal transmitted for each channel are detected by the reception electric field level detection section 9, and this is stored together with the channel number.

Next, the channels are switched from one ship to another, and the receiving levels are compared in the comparison section 10, and the channel number is stored in the storage section 11 for the ship where the H sound level is sufficiently low and the carrier wave reception level is high.

At 5:00 p.m., after confirming again that there are no interference waves, the user selects the most optimal channel with the highest reception level stored in the home storage unit 11, and connects that line. At this time,
If interference occurs, the next best stored channel is selected.

In this way, by checking the co-wire status of all channels before making a four-wire connection, the best channel can always be used. Therefore, noise due to fading etc. can be prevented.

FIGS. 2(a) and 2(b) are configuration diagrams showing other embodiments of the present invention. This embodiment shows an example that is applicable to a semi-duplex or duplex radio communication device, and includes two transceivers C,
The internal configuration of D is shown. In the figure, the same reference numerals as in FIG. 1 indicate the same components, and both transceivers C and D have the same configuration.

The operation between the transmitter and receiver configured as described above is similar to that of the embodiment shown in FIG. 1, and the difference is that the optimum channel search operation and data communication are performed bidirectionally. That is, both transceivers C and D are provided with a transmitting section 2, a receiving section 5, and a received electric field level detecting section 9, and a channel with an optimal radio wave condition is selected to perform data communication. Even with such a configuration, the same effects as in the above embodiment can be obtained.

Furthermore, if both radios are used fixedly, the radio wave condition of the line will not change significantly during use.
If the radio wave condition of each channel is monitored when the radio is installed or at any time before use, it is possible to perform data communication while always maintaining the optimum channel.

〔Effect of the invention〕

As described above, according to the present invention, the optimal channel is selected by comparing the receiving 4X Yj and field level of each channel before connecting the line, so that it is possible to always use the channel with good quality. This has the effect of preventing noise due to fading and the like.

[Brief explanation of drawings]

':JXllme 1(a), (b) shows one example of this invention 1-configuration [Nu 1, 2 Z(a), (b) shows another example of this invention It is a diagram. l...Data manual section 2...Transmission section 3...Antenna 4...Channel control section 5...Receiver 5 section 6. ... Antenna 7 ... Data output section 8 ... Channel control section 9 ... Reception 'It rise level detection section 10 ...
...Comparison part 1... Part 4

Claims (1)

[Claims] A wireless communication device that uses multiple channels and is equipped with a level detection circuit on the receiving side that detects the electric field level of the received signal, and is equipped with a comparator that compares the electric field level of each channel. A channel selection method for a wireless communication device, which is characterized in that the optimum channel for communication is selected by comparing the reception levels of the signals.