JPH11355178A - Radio communication equipment using frequency hopping system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide radio communication equipment using frequency hopping system with which disturbance from/to other radio communication equipment can be avoided in advance even when plural pieces of radio communication equipment using the frequency hopping system of the equal frequency hopping pattern are in operation. SOLUTION: A radio terminal 1a that is connected to a personal computer 2a and that is composed of radio equipment using a frequency hopping direction is provided with a timing shift button 12 composed of a push-button 12a and a rotary switch 12b, a means for discriminating the presence/absence of hopping pattern collision based on carrier detection, and a collision alarm display 11 for issuing an alarm when the presence of collision is discriminated. When the alarm is displayed on the collision alarm display 11, an operator presses the push-button 12a and changes an address value for reading frequency data from a hopping table. Besides, change width is varied by the rotary switch 12b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a radio communication apparatus using a frequency hopping system.

[0002]

2. Description of the Related Art In recent years, spread spectrum communication systems have been used for wireless communication devices in mobile communication environments such as mobile phones. The spread spectrum communication system is a system for spreading a spectrum component of a modulated signal over a wide frequency band, and a spread code sequence, which is a key for a kind of encryption, is used. Therefore, if this spreading code sequence is not known, the received signal cannot be demodulated, and high confidentiality can be secured. Also,
Since the spread spectrum communication system has an occupied bandwidth of a modulation signal which is much wider than that of a normal narrow band modulation system, the spread spectrum communication system has an excellent ability to reject an interfering wave (or an interference wave; the same applies hereinafter).

[0003] Particularly, in a wireless communication device in a mobile communication environment such as a cellular phone, an extremely large amount of demand is generated in a limited frequency band, and a further improvement in an ability to eliminate an interference wave is required. ing.

[0004] Therefore, recently, among the spread spectrum communication systems, a radio communication device using a frequency hopping system, which has a particularly high rejection capability of an interfering wave or an interference wave, has become mainstream. In the frequency hopping method, a carrier frequency flies over a wide frequency range (hops) with time. Therefore, when the interference wave or the interference wave is, for example, an unmodulated sine wave,
Unless the carrier frequency happens to be hopping to a frequency position corresponding to a frequency such as its unmodulated sine wave,
Not affected.

[0005]

However, a plurality of wireless communication devices using the frequency hopping method having the same frequency hopping pattern are used in a company or the like, and the plurality of wireless communication devices are respectively different wireless communication devices. In the case where communication is performed between the wireless communication device and the wireless communication device, there is a problem that one wireless communication device emits an interference wave to the other wireless communication device.

That is, the conventional wireless communication apparatus starts communication as long as the own station is not interrupted, without deciding whether or not to interfere with the wireless communication apparatus serving as another station, and continues communication as it is. As a result, a situation has occurred in which the above-mentioned other station is obstructed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and even when a plurality of wireless communication devices using a frequency hopping system having the same frequency hopping pattern are used, communication by another wireless communication device is obstructed. It is an object of the present invention to provide a wireless communication device using a frequency hopping method that can prevent interference from another wireless communication device without any problem.

[0008]

According to a first aspect of the present invention, there is provided a radio communication apparatus using a frequency hopping method, wherein the radio communication apparatus monitors communication between other stations, and monitors a hopping pattern in the communication between the other stations. Hopping pattern collision determining means for determining the presence or absence of collision with the hopping pattern of the own station, warning notifying means for notifying a warning, and a warning instruction for driving the warning notifying means based on the determination result of the collision determining means Means, a switch means for changing an output state in accordance with an operation, a storage means for storing a data group indicating a hopping frequency as a hopping table, and Hopping frequency changing means for changing the reading order of the data indicating the frequency.

According to the first aspect of the present invention, the communication between the other stations is monitored by the hopping pattern collision determination means, and the hopping pattern in the communication between the other stations and the local station are compared. It is determined whether there is a collision with the hopping pattern. If it is determined that there is a collision, the warning instructing means is driven by the warning instruction means, and a warning is issued. The operator can recognize the occurrence of the collision based on the notified warning. When the operator changes the output state by operating the switch means to avoid this collision, the hopping frequency change means responds to the change in the output state by changing the frequency from the hopping table stored in the storage means. Is changed. The hopping pattern of the own station after this change is different from the hopping pattern before the occurrence of the collision, and the collision is avoided.

According to a second aspect of the present invention, there is provided a radio communication apparatus using the frequency hopping scheme, wherein the collision of the hopping patterns is performed in the radio communication apparatus using the frequency hopping scheme according to the first aspect. The determination means determines whether or not there is a collision of the hopping pattern based on a reception state of the transmission signal in the communication between the other stations in a standby state in which substantial data is not transmitted and received between the own station and the other station. Is performed.

According to the radio communication apparatus using the frequency hopping method according to the second aspect of the present invention, in a standby state in which substantial data is not transmitted / received between the own station and the other station, the hopping pattern collision judging means is provided. The reception state of the transmission signal in the communication between other stations at the own station is monitored. If the reception state is worse than the predetermined reference state, it is determined that the hopping pattern has collided, and the warning notification unit is driven by the warning instruction unit as described above, and a warning is notified. If the state is better than a predetermined reference state, it is determined that there is no collision. Therefore, even when the communication is about to be started, it is possible to reliably prevent the inter-station communication that is already in communication from being interrupted, and perform highly reliable communication.

According to a third aspect of the present invention, there is provided a radio communication apparatus using the frequency hopping method, wherein the collision of the hopping pattern is performed in the radio communication apparatus using the frequency hopping method according to the second aspect. The determining means is configured to determine the presence or absence of the hopping pattern collision based on the received signal strength of the transmission signal in the inter-station communication at the own station.

According to the radio communication apparatus using the frequency hopping method according to the third aspect, the collision determining means of the hopping pattern is in a standby state in which substantial data is not transmitted and received between the own station and another station. As a result, the received signal strength at the own station is monitored for the transmitted signal in the inter-station communication. If the received signal strength is equal to or higher than the predetermined reference value, it is determined that the hopping pattern has a collision, and the warning notifying means is driven by the warning instructing means as described above, and a warning is notified. If the received signal strength is less than a predetermined reference value, it is determined that there is no collision. Therefore, even when the communication is about to be started, it is possible to reliably and easily prevent the inter-station communication that is already in communication, and to perform highly reliable communication.

According to a fourth aspect of the present invention, there is provided a radio communication apparatus using the frequency hopping scheme, wherein the radio communication apparatus uses the frequency hopping scheme according to any one of the first to third aspects. In the communication device, the warning instruction unit drives the warning notification unit when the hopping pattern collision determination unit continuously determines the presence of the hopping pattern collision a predetermined number of times. .

According to the radio communication apparatus using the frequency hopping method according to the fourth aspect, when the hopping pattern collision determination means continuously determines the presence of the hopping pattern a predetermined number of times, Since the warning instructing means is driven by the warning instructing means, the number of collision avoiding operations by the operator is reduced, and an easy-to-use wireless communication device is provided. Moreover, due to the characteristics of frequency hopping where the frequency spreads over a wide band,
Other than continuous collisions, there is little interference with other stations,
In addition, a wireless communication device with high reliability is provided because the interference received by the own station is small.

According to a fifth aspect of the present invention, there is provided a radio communication apparatus using the frequency hopping scheme according to any one of the first to fourth aspects. In the communication device, the warning instruction unit drives the warning notification unit when the hopping pattern collision determination unit determines the presence of the hopping pattern collision by a predetermined number of times or more within a predetermined time. And

According to a fifth aspect of the present invention, there is provided the radio communication apparatus using the frequency hopping method, wherein the hopping pattern collision determining means determines that there is a hopping pattern collision a predetermined number of times or more within a predetermined time. To
Since the warning instructing means is driven by the warning instructing means, the number of collision avoiding operations by the operator is reduced, and an easy-to-use wireless communication device is provided. Moreover,
Due to the characteristics of frequency hopping in which the frequency is spread over a wide band, there is little interference with other stations except for collisions that occur continuously, and there is little interference received by its own station. I will provide a.

According to a sixth aspect of the present invention, there is provided a wireless communication apparatus using the frequency hopping scheme, wherein the wireless communication apparatus uses the frequency hopping scheme according to any one of the first to fifth aspects. In the communication device, the hopping frequency changing unit changes a value of a counter indicating a reading position of data indicating the frequency from the hopping table.

According to the radio communication apparatus using the frequency hopping method according to claim 6, the value of the counter is changed by the hopping frequency changing means, and the hopping table is read out from the hopping table based on the changed counter value. A reading position of data indicating the frequency is designated. Therefore, the frequency of the own station is definitely different from that before the collision occurs, and the collision is reliably avoided.

According to a seventh aspect of the present invention, there is provided a wireless communication apparatus using the frequency hopping scheme, wherein the wireless communication apparatus uses the frequency hopping scheme according to any one of the first to sixth aspects. In the communication device, the warning notifying means is either a display means for optically displaying the warning information or a sounding means for notifying the warning information by a sound.

According to the wireless communication apparatus using the frequency hopping method according to the present invention, warning information is displayed optically by the display means as the warning notification means, or sound generation means as the warning notification means. Accordingly, the warning information is notified by sound, so that the operator can easily and surely recognize the occurrence of the collision.

[0022]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

(Configuration of Wireless Communication System) First, an example of a wireless communication system using the frequency hopping type wireless communication apparatus of the present invention will be described. FIG. 1 is an example of a wireless communication system.
As a, it is connected to the personal computer 2a. Note that a telephone may be connected instead of a personal computer. The wireless terminal 1a includes a collision warning display 11 using an LED or a liquid crystal as a warning notification unit,
A timing shift button 12 as a switch means,
An antenna 13 is provided. The collision warning indicator 11
When a radio wave from another system having the same frequency to be used is detected, light emission is displayed. Further, the timing shift button 12 includes a push button 12a and a rotary switch 12b that rotates around the push button 12a, and an operator who sees the light emission display presses the push button 12a. It is configured so that the frequency used can be changed. By turning the rotary switch 12b, the frequency change pattern can be changed. Details of these configurations will be described later.

When a plurality of wireless communication systems are used as shown in FIG. 2, an ID number is set for each system. And each system IDs another system
Communication is possible individually by calling by number.

In the example shown in FIG. 2, each system has radio terminals 1b, 1c, 1 having the same configuration as the radio terminal 1a.
d is connected to personal computers 2b, 2c and 2d having the same configuration as the personal computer 2a. In the following description, a system including the wireless terminal 1d and the personal computer 2d is referred to as “own station”, a system including the wireless terminal 1c and the personal computer 2c is referred to as “other station 1”, and a system including the wireless terminal 1b and the personal computer 2b. "Other station 2", wireless terminal 1a
And the personal computer 2a is referred to as “other station 3”.

(Configuration of Radio Communication Device) Next, the configuration of a radio communication device used for the radio terminals 1a, 1b, 1c and 1d will be described with reference to FIG.

As shown in FIG. 3, the wireless communication device according to the present embodiment includes an interface 48 connectable to a telephone or a personal computer. The interface 48 includes a codec and a compressor, and when a telephone is connected, performs an mutual conversion between an audio signal processed in the telephone and digital data processed in the wireless communication device. The interface 48 includes a buffer and a data converter. When a personal computer or the like is connected, the interface 48 stores digital data output from the personal computer or the like in the buffer and outputs digital data from a modem 47 described later. Error correction processing of digital data is performed by a data converter.

A modem 47 is connected to the interface 48. The modulator / demodulator 47 modulates digital data output from the interface into an intermediate frequency signal and demodulates an intermediate frequency signal output from a down converter 46 described later into digital data.

An up converter 41 and a down converter 46 are connected to the modulator / demodulator 47, a power amplifier 42 is connected to the up converter 41, and a low noise amplifier 45 is connected to the down converter 46, respectively.
Further, the power amplifier 42 and the low noise amplifier 45 include:
A transmission / reception switch 43 having the antenna 13 is connected. The up converter 41 and the down converter 46
Is connected to the PLL local oscillator 40.

The up-converter 41 includes a mixer, and outputs an intermediate frequency signal output from the
By adding the carrier signal from the L local oscillator 40, the intermediate frequency signal is converted into a communication frequency signal. The signal converted by the up converter 41 is amplified by the power amplifier 42 and transmitted by the transmission / reception switch 43 via the antenna 13.

On the other hand, the transmission / reception switching device 4
The signal received by 3 is amplified by the low noise amplifier 45 and input to the down converter 46.
The down converter 46 includes a mixer, and subtracts a carrier signal, which is an output signal of the PLL local oscillator 40, from the received signal amplified by the low noise amplifier 45, and converts the received signal into an intermediate frequency signal.

The PLL local oscillator 40 is an oscillator whose frequency is variable, and the oscillation frequency is controlled based on the frequency data read from the hopping table 36. The frequency conversion using the up-converter 41, the down-converter 46, and the PLL local oscillator 40 does not need to be performed in one stage, and a combination of these may be provided in another stage and performed in a two-stage configuration.

The timing of reading the frequency data from the hopping table 36 and the selection of the frequency data to be read are controlled by the hopping controller 35. In the hopping table 36, for example, as shown in FIG. 4, frequency data f0 to fm are stored at addresses 0 to m, and the hopping controller 35 outputs an address value M to the hopping table 36. The frequency data stored at the address corresponding to the address value M is set in the PLL local oscillator 40.

The hopping controller 35 outputs the address value M at the timing when the counter value of the hopping counter 34 is updated. The hopping counter 34 changes the LOW level of the output of the frame counter 32 to HIGH.
The frame counter 32 is configured to count up at the rise to the level. When the reference clock output from the clock 30 is divided by 1 / N, the frame counter 32 becomes LOW.
It is configured to output a pulse signal rising from the level to the HIGH level. Therefore, by setting the count value N of the frame counter 32 to a value such that Tr × N = Tf with respect to the cycle Tr of the reference clock, the pulse signal from the frame counter 32 is output with a cycle Tf, The counter value of the hopping counter 34 is also counted up in the cycle Tf. As a result, for example, the counter value of the hopping counter 34 becomes m−
Assuming that the count is increased from 1 to m, the counter value of the hopping counter 34 becomes 0 after a period Tf from the timing of the count up, and the hopping controller 35 outputs the counter value 0 to the hopping table 36 as an address value. Hopping table 3
6, the frequency data f0 of the address 0 corresponding to this address value is read out, and the PLL local oscillator 4
Set to 0. Thereafter, the counter value of the hopping counter 34 is counted up at a cycle Tf, and the hopping table 36 performs frequency hopping in the order of f1, f2, f3,. FIG. 5 shows how the frequency is hopped. The values of the frequency data f0 to fm are set to random values.

As described above, in this embodiment, by setting the counter value of the frame counter 32 to a predetermined value, frequency hopping is performed for each period Tf (this period is called a frame period), and the frequency is wide. It can be spread over a band.

Here, the frame period, which is a time unit when performing frequency hopping, will be described in detail. FIG. 6A is an example showing the structure of a frame. First, the controller 35 reads out the next frequency data from the hopping table 36 in the period T1, sets it in the PLL local oscillator 40, and hops. Then, the transmission / reception switch 43 is switched to transmission, and the period T2 is set as a transmission period,
First, a synchronization signal is transmitted, and the timing after hopping with the communication partner is matched. Next, the ID and data are transmitted at the set frequency while the transmission / reception switch 43 remains transmitting. Further, the next period T3 is set as a reception period, and the transmission / reception switch 4
3 is switched to reception, and reception is performed at the set frequency. A period Tf including these periods T1, T2, and T3 is one frame, and frequency hopping is performed for each frame. The structure of the frame is not limited to that shown in FIG.
As shown in FIG. 6B, after performing frequency hopping in the period T1, only transmission may be performed in the period T4. Further, as shown in FIG. 6C, after performing frequency hopping in the period T1, only reception may be performed in the period T4. In the case of FIGS. 6B and 6C, the period Tf including the period T1 and the period T4 is one frame. Such frames are used, for example,
There is a case where a large amount of data is transmitted or received by connecting to a personal computer or the like.

Next, in the present embodiment, the above-described timing shift button 1
2 is connected, and the timing shift button 12
Of the push button 12a of the hopping controller 3
5 is detected, a hopping controller 35 as a hopping frequency changing means is turned on by a hopping counter 34.
The correction value s is added to the counter value n, and n + s is output to the hopping table 36 as the address value M. When the push button 12a is further pressed, the correction value s is further added, and n + 2s becomes the address value M. That is, assuming that the number of times the push button 12a of the timing shift button 12 is pressed is k, n + k × s becomes the address value, and a frequency collision with another station can be prevented. Further, the correction value s is variable within a predetermined range by turning the rotation switch 12b of the timing shift button 12. Furthermore,
The value of k may be cleared to zero, for example, when the value of (k × s) exceeds the total number m of data in the hopping table 36.

The collision of the hopping pattern is performed by a carrier detector 50 connected to the down converter 46 and serving as collision determination means. The carrier detector 50 is
The intermediate frequency signal from the down converter 46 is input and the level of the intermediate frequency signal is monitored. If this level is equal to or more than a certain value, the above-mentioned collision warning indicator 11 is driven to display a warning. The carrier detection is not limited to the case where the carrier detection is performed based on the intermediate frequency signal, and may be configured to directly detect the level of the received signal.

Since the collision warning display 11 is performed based on the detection of the carrier, the display operation is performed even when a call signal to the own station is received. However, in this case, since the ID number for the own station can be recognized by the personal computer 2a or the like, a response process to the calling signal is performed.

Therefore, if a warning is displayed on the collision warning display 11 in a state in which a response process to a call signal from another station is not performed, a collision of a hopping pattern with another station occurs. Can be determined.

(Change processing of reading order of frequency data)
Next, the reading process of the frequency data in the present embodiment will be described with some examples.

[When the same hopping table is used for a plurality of systems] In this example, as shown in FIG. 2, all the systems use the same hopping table, and the other stations 2 and 3 have already communicated. In the middle, the own station is in a state where there is no call signal to the own station from any other station.

In such a state, the wireless terminals 1a, 1a,
1b, 1c, and 1d all have the same hopping table 36.
Since a wireless communication device provided with
As shown in (a) and (b), a hopping pattern may collide with another station. In FIG. 7A, the frequencies f1 and f2 collide. FIG. 7A shows a case where the frame periods overlap each other, and FIG. 7B shows a case where a part of the frame periods overlaps. In the cases shown in these figures, the collision warning indicator 11 continuously displays a warning, so that the operator of the own station can recognize that the collision of the hopping pattern has occurred.

Then, the operator presses the push button 12a of the timing shift button 12, thereby
The frequency reading order in the own station is changed. FIG.
Push button 1 at timing shown in (a), (b)
Assuming that 2a is pressed, at the time of pressing, the counter value n of the hopping counter 34 is 2, and the frequency is f2.
Therefore, when the output of the frame counter 32 rises from the LOW level to the HIGH level, the counter value n of the hopping counter 34 becomes 3, but when the correction value s is set to 2, the address value becomes 3 + 2 = 5. Becomes
The frequency f5 is read from the hopping table 36,
The PLL local oscillator 40 is set.

However, in the other stations, since the address value increases by one, the frequency read out next to the frequency f2 becomes f3, and it is possible to prevent a collision between the frequencies. Hereinafter, in the own station, the hopping counter 34
N + 2 becomes the address value with respect to the counter value n, and the frequencies are f6, f7,..., So that the collision of the frequencies with each other is reliably prevented.

As described above, according to the present embodiment, with a simple configuration, it is possible to reliably prevent interference with other stations and also reliably prevent interference with other stations. Can be provided. Further, the occurrence and degree of the interference can be easily grasped by the operator, and the interference can be avoided with a simple operation, so that the occurrence of the interference in the wireless communication environment can be significantly reduced.

[When there is a hopping table different from the system of the present embodiment and a system that performs hopping at a different timing] Next, not only the wireless communication system of the present embodiment as shown in FIG. When there is a hopping table different from that of the above system and another system that performs hopping at a different timing, consider a case where the other system affects the wireless communication system of the present embodiment.

For example, as shown in FIG. 8, when another system sets a frame period Tf ′ longer than the frame period Tf of the system of the present embodiment and performs hopping as shown in FIG. If the push button 12a is not pressed, six collisions occur during the period in which the frequency hops to f12. In FIG. 8, the arrow indicated by the dotted line indicates the timing at which the collision occurs.

Here, when the first collision occurs, that is, when the first collision warning indicator 11 displays a warning, the push button 1
When 2a is pressed once, the number of collisions decreases, but four collisions occur. This is because, unlike the example described above, the hopping table and the hopping timing are different in the respective systems.

Further, when the push button 12a is pressed twice, that is, when the first collision occurs and when the second collision occurs, no collision occurs after the second depression.

As described above, if there is a hopping table and another system having different hopping timings, a collision cannot be avoided by pressing the push button 12a once, but the number of times of display of the collision warning indicator 11 is reduced. By pressing the push button 12a a plurality of times in a decreasing manner, a collision can be avoided or significantly reduced.

[Case where system combining wireless terminal and telephone according to this embodiment and system combining wireless terminal and personal computer according to this embodiment coexist]
Next, although the system using the wireless terminal of the present embodiment, as a device connected to the wireless terminal, a system using a voice device such as a telephone, and a system using a data device such as a personal computer, Consider a case in which indoors are used together.

In such a situation, the use status of other systems can often be grasped to some extent. Therefore, even when the collision warning indicator 11 displays a warning, the collision warning indicator 11 can freely transmit the warning at the discretion of the operator. it can.

For example, a system in which the own station combines a personal computer and the wireless terminal of the present embodiment,
When trying to transmit data to another system combining the printer and the wireless terminal of the present embodiment, communication is performed between the other system combining the wireless terminal of the present embodiment and the telephone. It is assumed that the collision warning indicator 11 of the own station has performed a warning display due to the influence of.

In such a case, if data is transmitted from the own station, it will interfere with another system having a telephone. However, when voice transmission is performed using a telephone or the like, even if some interference occurs, it does not hinder the transmission of information. Also, the local station will be interrupted by other systems that have a telephone, but if an error occurs during transmission, transmission will only be redone, so if you do not hurry printout, etc. There is no problem even if it is slightly obstructed.

As described above, when the usage status of another device can be grasped to some extent, the transmission can be freely performed by an appropriate judgment of the operator.

(Other Embodiments of Hopping Frequency Changing Means) In the above-described embodiment, an example was described in which the timing shift button 12 was connected to the hopping controller 35 and the hopping controller 35 was used as the hopping frequency changing means. However, the present invention is not limited to such a configuration, and the following embodiments are also possible.

First, as shown in FIG. 9, a hopping gate 60 is provided between the frame counter 32 and the hopping counter 34, and the timing shift button 12 is connected to the hopping gate 60. In this example, the operation of the timing shift button 12 can temporarily prevent the signal from the frame counter 32 from updating the hopping counter 34, so that the reading order of the frequency data from the hopping table 36 is changed. can do.

Next, as shown in FIG. 10, the timing shift button 12 can be connected to the hopping counter 34. In this example, the hopping counter 34 can be directly reset by operating the timing shift button 12, and the reading order of the frequency data from the hopping table 36 can be changed. Further, by operating the timing shift button 12,
The value of the hopping counter 34 may be directly changed. For example, a configuration can be employed in which a random number is set in the hopping counter 34 by operating the timing shift button 12.

(Another Embodiment of Warning Informing Means) In the above-described embodiment, the output signal of the carrier detector 50 is configured to be directly input to the collision warning display 11, but the present invention is applied to this configuration. It is not limited.

For example, as shown in FIG. 11, a timer 70 is provided between the carrier detector 50 and the collision warning indicator 11, and after detecting the carrier, the collision is detected when the timer 70 continuously detects the carrier for a predetermined time or more. A warning display can be provided. Due to the characteristics of frequency hopping in which the frequency is spread over a wide band, it is difficult to interfere with others except for the case where collisions occur continuously, and it is also hard to receive interference from others, so by configuring in this way Thus, the burden on the operator for operation can be reduced.

In order to achieve the same purpose,
As shown in FIG. 12, a counter 71 is provided between the carrier detector 50 and the collision warning indicator 11, and a predetermined time counter 72 measures the number of carrier detections corresponding to the number of disturbances. It can be configured to display a collision warning.

[0063]

As described above, according to the radio communication apparatus using the frequency hopping method according to the first aspect,
If a collision between the hopping pattern in the inter-station communication and the hopping pattern of the own station occurs, a warning is notified, and based on the warning, the operator changes the reading order of the data indicating the frequency from the hopping table. Therefore, the collision can be reliably avoided with a simple configuration, and a highly reliable wireless communication device can be provided.

According to the wireless communication apparatus using the frequency hopping method according to the second aspect, the transmission signal in the inter-station communication is set in a standby state in which substantial data is not transmitted and received between the own station and the other station. Based on the reception status at the own station, it is determined whether there is a collision of the hopping pattern, so even when trying to start the communication from now on, reliably prevent interference with other stations already in communication And highly reliable communication can be performed.

According to the wireless communication apparatus using the frequency hopping method according to the third aspect, it is determined whether or not there is a collision of the hopping pattern based on the received signal strength of the transmission signal in the communication between other stations. Since communication is performed, even when communication is about to be started, it is possible to reliably and easily prevent interference with communication between other stations that is already in communication, and to perform highly reliable communication.

According to the radio communication apparatus using the frequency hopping method according to the fourth aspect, when the determination of the collision is continuously performed a predetermined number of times, the warning is notified. The number of times of the collision avoidance operation by the operator can be reduced, and an easy-to-use wireless communication device can be provided. In addition, due to the characteristics of frequency hopping in which the frequency is spread over a wide band, there is little interference with other stations except for collisions that occur continuously, and there is little interference with the own station. A communication device can be provided.

According to the radio communication apparatus using the frequency hopping method according to the fifth aspect, the warning is issued when the collision is judged a predetermined number of times or more within a predetermined time. Therefore, the number of collision avoidance operations performed by the operator can be reduced, and an easy-to-use wireless communication device can be provided. In addition, due to the characteristics of frequency hopping in which the frequency is spread over a wide band, there is little interference with other stations except for collisions that occur continuously, and there is little interference with the own station. A communication device can be provided.

According to the radio communication apparatus using the frequency hopping method according to the sixth aspect, the position of the data indicating the frequency from the hopping table is indicated by changing the value of the counter. The frequency can be reliably set to a frequency different from that before the occurrence of the collision, and the collision can be reliably avoided by a simple process. . According to the wireless communication apparatus using the frequency hopping method according to the seventh aspect, the warning information is optically displayed or the warning information is notified by sound, so that the operator can easily and reliably generate the collision. Since it can be recognized, appropriate collision avoidance measures can be encouraged, and the wireless communication environment can be optimized.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating an example of a wireless communication system using a wireless communication device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a use mode of the wireless communication system of FIG. 1;

FIG. 3 is a block diagram illustrating a schematic configuration of a wireless communication device using a frequency hopping scheme according to an embodiment of the present invention.

FIG. 4 is a diagram showing the contents of a hopping table provided in the wireless communication device of FIG. 3;

FIG. 5 is a diagram showing the contents of a hopping table provided in the wireless communication device of FIG. 3;

6A and 6B are timing diagrams illustrating a frame period used in the wireless communication apparatus of FIG. 3; FIG. 6A is an example in which transmission and reception are performed in one frame period; FIG. FIG. 9C is a timing chart illustrating an example of performing the operation, and FIG. 9C is a timing chart illustrating an example of performing only reception during one frame period.

FIG. 7 is a timing chart showing collision of hopping patterns and avoidance of collision in the wireless communication apparatus of FIG. 3;
(A) is for a system in which the frame periods match,
(B) is a diagram showing a case of a system in which frame periods overlap.

8 is a timing chart showing collision and avoidance of collision between the wireless communication apparatus of FIG. 3 and systems having different hopping patterns and hopping timings.

FIG. 9 is a block diagram showing another embodiment of the hopping frequency changing means in the wireless communication device of FIG. 3;

FIG. 10 is a block diagram showing another embodiment of the hopping frequency changing means in the wireless communication device of FIG. 3;

FIG. 11 is a block diagram showing another embodiment of the warning instruction means in the wireless communication device of FIG. 3;

FIG. 12 is a block diagram showing another embodiment of the warning instruction means in the wireless communication device of FIG. 3;

[Explanation of symbols]

 1a, 1b, 1c, 1d: Wireless terminal 2a, 2b, 2c, 2d: Personal computer 11: Collision warning display 12: Timing shift button 12a: Push button 12b: Rotary switch 13: Antenna 32: Frame counter 34: Hopping counter 35 hopping controller 36 hopping table 40 PLL local oscillator 41 up converter 42 power amplifier 43 transmission / reception switch 45 low noise amplifier 46 down converter 47 modulator / demodulator 48 interface 50 carrier detector

Claims (7)

[Claims] 1. A hopping pattern collision judging means for monitoring inter-station communication and judging whether or not a hopping pattern in the inter-station communication has collided with a hopping pattern of the own station, and a warning notifying means for notifying a warning A warning instructing means for driving the warning notifying means based on a result of the determination by the collision determining means; a switch means for changing an output state in accordance with an operation; and a data group indicating a hopping frequency is stored as a hopping table. Storage means, and a hopping frequency changing means for changing the reading order of the data indicating the frequency from the hopping table in accordance with a change in the output state of the switch means. Wireless communication device. 2. The hopping pattern collision judging means according to claim 1, wherein in a standby state in which substantial data is not transmitted and received between the own station and another station, a transmission signal in the inter-station communication is received by the own station. 2. The wireless communication apparatus using a frequency hopping method according to claim 1, wherein it is determined whether or not the hopping pattern has a collision. 3. The hopping pattern collision judging means judges the presence or absence of the hopping pattern collision based on the received signal strength of the transmission signal in the inter-station communication at the own station. 3. A wireless communication device using the frequency hopping method according to 2. 4. The warning instructing means activates the warning notifying means when the hopping pattern collision judging means continuously performs the hopping pattern collision judgment a predetermined number of times. Claim 1
A wireless communication device using the frequency hopping method according to claim 3. 5. The warning instructing means, when the collision determination of the hopping pattern is performed by the hopping pattern collision determining means for a predetermined number of times within a predetermined time, activates the warning notifying means. A wireless communication device using the frequency hopping method according to any one of claims 1 to 4. 6. The hopping frequency changing unit according to claim 1, wherein the hopping frequency changing unit changes a value of a counter indicating a reading position of data indicating the frequency from the hopping table. A wireless communication device using the frequency hopping method described in the paragraph. 7. The apparatus according to claim 1, wherein the warning notifying means is one of a display means for optically displaying warning information and a sounding means for notifying warning information by sound.
A wireless communication device using the frequency hopping method according to claim 6.