JPH1098415A - Radio communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend the selection range of carrier frequencies without delaying the decision of a carrier frequency in use for communication. SOLUTION: Whether or not there is a prescribed degree of interference or over imposed on all carrier frequencies (f1, f2,...fL) of a 1st hop table 26 is discriminated by using an error rate table 35a and an error rate calculation section 35c or the like, and a carrier frequency discriminated to receive interference is stored to a 2nd hop table 35b by setting a SW flag of the table 35b. When any of the carrier frequencies (d1, f2,...fL) of the hopping pattern is coincident with the carrier frequency discriminated to receive interference, a 2nd spread signal s2 of a 2nd PLL local oscillator 37 is added to a 1st spread signal s1 of this carrier frequency and then the resulting frequency is changed into other carrier frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication device for performing bidirectional communication while switching a carrier frequency according to a predetermined hopping pattern by a frequency hopping method.

[0002]

2. Description of the Related Art In recent years, a spread spectrum wireless communication system that obtains communication data by despreading and demodulating a received signal while modulating and transmitting communication data after modulation has been developed. Attention has been focused on enabling low power density communications. In particular, when transmitting and receiving by the spread spectrum method, when spreading and despreading are performed by frequency hopping in which the carrier frequency is sequentially switched, the confidentiality of the signal is improved and the communication failure due to interference is reduced, so this frequency hopping is applied. 2. Description of the Related Art Spread spectrum wireless communication systems are being widely adopted in various fields such as telephones and facsimile machines.

Conventionally, a radio communication device employed in a radio communication system of the above-described type has a hop table having a predetermined number of spreading codes indicating carrier frequencies for spreading and despreading, and a hopping pattern based on this hop table. The communication is performed at a carrier frequency that has been frequency hopped according to the following formula. At this time, if interference occurs on the frequency-hopped carrier frequency, a communication failure occurs due to the interference during the period in which communication is being performed at this carrier frequency, and the reliability of communication is reduced.

Therefore, in Japanese Patent Application Laid-Open No. 6-334630, test carrier frequencies are registered in advance, interference wave levels are measured for these carrier frequencies, and carrier frequencies with lower interference wave levels are sequentially selected. To determine a hopping pattern of a predetermined number of hops. Then, a method has been proposed in which a hop table serving as the hopping pattern is provided in all wireless communication devices so that communication is performed only at a carrier frequency having a low interference wave level, thereby improving the reliability of communication data.

[0005]

However, in the method of selecting a carrier frequency to be used for a hopping pattern from a pre-registered carrier frequency for a test as in the prior art, the range of selection is limited to the carrier frequency for a test. It will be limited to. Therefore, in order to expand the range of selection, it is necessary to increase the number of registered carrier frequencies for the test. As a result, the number of times of measuring the interference wave level increases, so that the carrier frequency used for communication is reduced. A problem occurs that it takes a long time to decide.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a radio communication device capable of expanding a range of selection of a carrier frequency without delaying determination of a carrier frequency used for communication.

[0007]

In order to solve the above-mentioned problems, the invention according to claim 1 is a radio communication device for performing bidirectional communication while switching carrier frequencies according to a hopping pattern composed of a plurality of carrier frequencies, Determining means for determining whether or not interference has occurred for all carrier frequencies of the hopping pattern by a predetermined amount or more, frequency storage means for storing a carrier frequency determined to be interfered, and the carrier frequency of the hopping pattern is A frequency changing unit that changes the carrier frequency to another carrier frequency when the carrier frequency matches the carrier frequency of the frequency storage unit. Thus, when changing the carrier frequency of the hopping pattern to another carrier frequency by the frequency changing unit, by adjusting the amount of change, the carrier frequency used in the communication processing can be set to an arbitrary frequency. Therefore, even if the range of selection of the carrier frequency used in the communication processing is expanded to the number of hops of the hopping pattern or more, it is only necessary to adjust the change amount to another carrier frequency in the frequency changing means, so that interference is determined. Since the number of times is limited to the number of hops in the hopping pattern,
A carrier frequency used for communication can be determined in a fixed time.

According to a second aspect of the present invention, in the wireless communication apparatus according to the first aspect, the frequency changing means changes the carrier frequency between carrier frequencies of the hopping pattern. As a result, the carrier frequency can be flexibly changed according to the state of the interference, and the utilization efficiency of the carrier frequency can be improved.

According to a third aspect of the present invention, there is provided the wireless communication device according to the first or second aspect, further comprising a first setting management unit for periodically performing the determination by the determination unit. . Accordingly, it is determined whether or not interference is regularly made for all carrier frequencies, so that good communication can be stably performed.

According to a fourth aspect of the present invention, there is provided the wireless communication device according to the first or second aspect, further comprising a second setting management means for making the determination by the determination means during communication. . Thereby, when a carrier frequency that is being interfered is detected during communication, a simple process of storing the corresponding carrier frequency in the frequency storage means can be performed at a high speed. Good communication can be performed stably.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The wireless communication device according to the present embodiment is used in a wireless communication system that performs two-way communication between communication devices while switching a carrier frequency according to a predetermined hopping pattern by a frequency hopping method. This wireless communication system is, for example, as shown in FIG.
It has a base unit 10 that is one wireless communication device and slave units 11 to 15 that are five wireless communication devices that can communicate with each other and can communicate with each other. Note that a telephone, a facsimile machine, a printer, a computer, and the like can be applied to the master device 10 and the slave devices 11 to 15. Communication between master device 10 and slave devices 11 to 15 and communication between slave devices 11 to 15 are performed as shown in FIG.
uplex) system, and when one is in the transmission state (TX), the other is in the reception state (RX), and communication is performed by alternately replacing the transmission state (TX) and the reception state (RX). It is supposed to do.
Note that this wireless communication system uses TDMA (Time Division M
The communication may be performed by a utiple access) method.

The above-mentioned master unit 10 and slave units 11 to 15
As shown in FIG. 1, a wireless communication unit 1 for transmitting and receiving communication data by a spread spectrum method while frequency hopping is provided. The wireless communication unit 1 has an interface unit 21 that processes and inputs and outputs communication data to and from an external circuit (not shown). Interface unit 2
1 includes a codec and a compressor for mutually converting between voice data and a digital signal when the communication data is voice data, and performs buffering and error correction processing when the communication data is non-voice data. It has a data converter to perform.

The interface unit 21 is connected to a modulator / demodulator 22 having a modulator 22a for modulating communication data and a demodulator 22b for demodulating communication data. The modulator / demodulator 22 switches the operating state of the modulator 22a and the demodulator 22b between transmission and reception of communication data by a transmission command signal p and a reception command signal q from the controller 35. Then, the modulation section 22a operated at the time of transmission is connected to an up-converter 23 having a mixer.

The up converter 23 has a first P
An LL local oscillator 25 is connected, and a first hop table 26 is connected to the first PLL local oscillator 25. As shown in FIG. 4, the first hop table 26 stores first spreading codes (spreading frequency data) f1, f2,... FL corresponding to the respective channels C1, C2,. Then, as shown in FIG. 1, these first hop tables 2
6 and the first PLL local oscillator 25, a hop signal r is input from the controller 35 every predetermined dwell time. The first hop table 26 stores a hop signal every time the hop signal r is input. The first spreading code f corresponding to the channel c of the channel setting value S indicated by the signal r
Is output to the first PLL local oscillator 25, and the first PLL local oscillator 25 outputs to the up-converter 23 a first spread signal (local oscillation signal) s1 having a carrier frequency corresponding to the first spread code f. Hereinafter, when a carrier frequency corresponding to a specific spreading code (for example, f1) is indicated, it is referred to as, for example, a carrier frequency (f1).

The up converter 23 has a second P
The LL local oscillator 37 is also connected. The second PLL local oscillator 37 receives a second spread code g from the controller 35 at every predetermined dwell time, and a PLL control signal h for switching the second PLL local oscillator 37 between an operating state and a stopped state. Is entered. Then, the second PLL local oscillator 37 outputs the PL
Only when activated by the L control signal h, the second
A second spread signal (local oscillation signal) s2 having a carrier frequency corresponding to the spread code g is output to the up-converter 23.

The up-converter 23 adds the first spread signal s1, the second spread signal s2, and the modulated signal t of the communication data from the modulator 22a to add a spread modulated signal u of a spread carrier frequency. Is formed. This spread modulation signal u is supplied to the power amplifier 24
Is output to the power amplifier 24.
The spread modulated signal u is amplified and output to the transmission / reception switch 27. The transmission / reception switch 27 includes a controller 3
5, the transmission command signal p and the reception command signal q are input. When the transmission designation signal p is input, the operation state is set to the transmission enabled state and the power amplifier 24
Is transmitted from the antenna 28. On the other hand, when the reception command signal q is input, the operation state is set to the receivable state, and the spread modulation signal u received via the antenna 28 is transmitted to the low noise amplifier 3.
1 is output.

The low-noise amplifier 31 is connected to a down-converter 32.
Is amplified and output. The down-converter 32 receives the first spread signal s1 and the second spread signal s2 input to the up-converter 23, and the down-converter 32 outputs the first spread signal s1 and the second spread signal s1. Signal s
2, the spread modulation signal u is despread to form a modulation signal t, and the modulation signal t is output to the demodulation unit 22b. The demodulation unit 22b demodulates the input modulated signal t and outputs the demodulated signal t to the interface unit 21.

The wireless communication unit 1 having the above configuration operates by being supplied with power from a power supply unit 36. The power supply unit 36 controls a part or the controller 35 before a communication start process. The power supply destination is set by the controller 35 so as to limit the power supply to all the wireless communication units 1 except for the power supply destination. That is, the controller 35 controls so as to supply power only to the controller 35 in the sleep mode, and controls so as to supply power except for the transmission unit including the up-converter 23 and the power amplifier 24 in the reception standby mode. In the mode, control is performed to supply power to the entire wireless communication unit 1.

The controller 35 for controlling each section as described above has an error rate table 35a and a second hop table 35b. In the error rate table 35a,
As shown in FIG. 5, the error rate eA (1 to L) when test data is transmitted and received at the carrier frequencies (f1, f2,... FL) of the channels C1, C2,. ) ~
eB (1 to L) and the total error rate eT obtained by adding them.
(1 to L) are stored. Also, as shown in FIG. 6, the second hop table 35b includes the second hop table 35b.
The spreading codes g1, g2,... GL and the SW flags set to “ON” or “OFF” based on the total error rate eT (1 to L) correspond to each channel C1, C2,. Let me be stored.

The controller 35 also has an error rate calculator 35c as shown in FIG. When digital value test data is input, the error rate calculation unit 35c determines the error rate eA (1 to L) corresponding to the test data.
To eB (1 to L) are calculated and output. The error rates eA (1 to L) to eB (1 to L) are calculated as follows at the time of error correction by the checksum method. Note that error correction by the checksum method is substantially the same in principle as error correction by a spread RS code or a CRC code, and therefore, the error rates in these error corrections can be obtained by substantially the same calculation method.

That is, as shown in FIG. 7, the value of the test data at the address CA00 (h) is C3 (h) = 11000011.
(b) When the value of the test data at address CA01 (h) is 35 (h)
= 00110101 (b), CA00 (h)-
It is assumed that test data at address CA7F (h) exists. If there are no errors during data transfer, it is sufficient to transmit only these test data serially.However, in order to find errors during transfer, the horizontal and vertical checksum columns are located at the right end and bottom end in the figure, respectively. Add. Note that these checksum fields need only be arranged at an arbitrary position in the table.

The horizontal checksum column stores the lower two digits of the total of the test data in the horizontal direction. In the vertical checksum column, the lower two digits of the test data summed in the vertical direction are stored. The total value of the horizontal checksum column or the lower two digits of the total value of the vertical checksum column is stored in the total checksum column at the lower right end where the horizontal checksum column and the vertical checksum column overlap. It has become.

When the test data and the checksum data in each checksum column are formed as described above, these data are transmitted. Then, the data receiving side calculates the values of each checksum column based on the received test data, and compares these calculated values with the received values of the received checksum column. As a result, if all the values match, it is confirmed that no error has occurred due to the data communication. On the other hand, if a mismatch value exists, it is confirmed that an error has occurred in the test data or the checksum data.

Here, as a first case, when an error occurs in one part of the test data, different values exist in the calculated value and the received value in the vertical checksum column and the horizontal checksum column. Therefore, it can be corrected by back calculation. As a second case, when an error occurs in the received value of the checksum column, only the checksum column is determined from the relationship between the value “1A” of the total checksum column, the horizontal and vertical checksum columns, and the test data. Since the error is known, the error can be corrected.

Further, as a third case, two locations (for example, CA22 (h) and CA24 (h)) of the received test data
), An error has occurred, and if the value in the horizontal checksum column is the same value “C7” between the received value and the calculated value, it is known that an error has occurred in the vertical checksum column.
Correction cannot be performed because it is not possible to specify in which part the error has occurred. Further, as a fourth case, four locations of the received test data (for example, CA22
(h), CA24 (h), CA58 (h), CA5A (h)), an error occurs in the comparison between the calculated value and the received value in the horizontal and vertical checksum fields. Since it cannot be found, the received test data cannot be corrected.

Then, among the various cases,
The error rate is, as in the first, second, and third cases,
Regardless of whether correction is possible or not, the number of found errors is obtained by dividing the number of found errors by the total number of data.

As described above, the error rate eA (1−L) 〜
The controller 35 having the error rate calculator 35c for calculating eB (1 to L) further executes a SW flag setting processing routine in FIG. The SW flag setting processing routine is executed periodically or by operating a frequency setting switch or the like (not shown). The above-described test data and checksum data are stored in the carrier frequency (f1, f2) of the first hop table 26. ,... fL) are sequentially transmitted and received, and the error rate eA (1 to
After calculating L) to eB (1 to L), these are summed to obtain a total error rate eT (1 to L). Channels C1, C2,... Where the total error rate eT (1 to L) is less than the reference value.
For the CL, the SW flag is set to “OFF”, and the channels C1, C2,.
For the CL, "ON" is set in the SW flag. Then, the controller 35 performs communication while operating and stopping the second PLL local oscillator 37 based on the SW flag, for example, when executing the call processing routine of FIG. 9.

In the above configuration, the master unit 10 sets the SW flag based on the error rates eA (1 to L) to eB (1 to L) of the test data, and performs communication with the slave units 11 to 15. The case will be described with reference to the flowcharts of FIGS.

When the controller 35 recognizes that the set time has passed by an internal timer (not shown) or recognizes that the operator has operated a frequency setting switch (not shown), the controller 35, as shown in FIG. Executes the SW flag setting processing routine of FIG. That is, "1" is set for the channel set value S, "1" is set for the channel count value C (S1), and "L" corresponding to the total number of channels in the first hop table 26 is set for the maximum channel count value Cmax. (S2). Thereafter, the transmission command signal p is transmitted to the modem 2
2 and the transmission / reception switch 27, thereby setting the modulation section 22a of the modem 22 to the operating state,
The transmission / reception switch 27 is set to the transmission state. Further, by outputting the hop signal r having the channel set value S of “1” to the first hop table 26 and the first PLL local oscillator 25, the first spreading of the first channel C1 with respect to the first hop table 26 is performed. The code f1 is output to the first PLL local oscillator 25, and the first spread signal s1 of the carrier frequency (f1) corresponding to the first spread code f1 is output to the first PLL local oscillator 2
5 to upconverter 23 and downconverter 3
2 is output. On the other hand, the PLL control signal h of “OFF” is output to the second PLL local oscillator 37 to stop the operation, and the output of the second spread signal s2 is prohibited.

Next, after forming the test data and the checksum data shown in FIG. 7, a test signal including these data is transmitted to the modem 22 via the interface unit 21.
To be captured. After being modulated by the modulator 22 a, the modulated signal t is output to the up-converter 23, and the modulated signal t and the first PLL local oscillator 25
The spread modulation signal u is formed by adding the spread signal s1. Thereafter, the spread modulation signal u is transmitted to the power amplifier 24.
After amplification by the antenna 28 via the transmission / reception switch 27
Is transmitted to all the slaves 11 to 15 (S3).

When the transmission of the test data is completed in S3, the controller 35 outputs the reception command signal q to the modem 22 and the transmission / reception switch 27,
The demodulator 22b of the modem 22 is set to the operating state, and the transmission / reception switch 27 is set to the receiving state. Then, when the test data and the like returned from all the slaves 11 to 15 are received (S4), these data are sent to the error rate calculation unit 35.
c, the error rates eA (1) to eB corresponding to each of the slave units 11 to 15 in the error rate calculation unit 35c.
(1) is calculated. Then, as shown in FIG. 5, the error rate eA output from the error rate calculation unit 35c.
(1) to eB (1) are stored in the error rate table 35a,
By adding these error rates eA (1) to eB (1), the total error rate eT (1) at the pattern candidate frequency (f1) is obtained (S5).

When the total error rate eT (1) is obtained, the total error rate eT (1) is compared with a reference value, and the total error rate eT (1) is calculated.
It is determined whether T (1) is less than the reference value (S
6). If it is less than the reference value (S6, YES), it is determined that good communication with almost no communication failure due to interference is possible, the second PLL local oscillator 37 is stopped, and the carrier frequency (f1) of the first PLL local oscillator 25 is reached. The SW flag of the channel C1 is set to "OFF" so that communication is performed only by using the channel C1 (S7). On the other hand, if not less than the reference value (S6, N
O) It is determined that good communication is difficult due to interference, and the carrier frequency (f1) of the first PLL local oscillator 25 and the second PLL
The carrier frequency obtained by adding the carrier frequency (g1) of the local oscillator 37
The SW flag of the channel C1 is set to "ON" so as to perform communication at (f1 + g1) (S8).

Next, it is determined whether or not the channel count value C is smaller than the maximum channel count value Cmax ("L") (S9).
YES), the channel set value S and the channel count value C are counted up by "1" so as to transmit and receive the test data at the next carrier frequency (f2) (S10). Thereafter, when a predetermined dwell time elapses by an internal timer or the like (not shown), a hop signal r indicating the channel set value S is output to the first hop table 26 and the first PLL local oscillator 25 and frequency hopped ( S1
1) Re-execute from S3, and execute the error rates eA (2) to eB (2) and the total error rate eT at the next carrier frequency (f2).
(2) is obtained, and S of channel C2 is obtained by comparison with a reference value.
Set the W flag.

And, in this way, all carrier frequencies
When the setting of the SW flag corresponding to (f1, f2,... fL) is completed, it is determined that the channel count value C is not smaller than the maximum channel count value Cmax (“L”) (S9, NO). , And transmits the flag data of the SW flags of all the channels C1, C2,... CL to the slave units 11 to 15. Then, the flag data is set to the SW flag of the second hop table 35b of the slave units 11 to 15 by causing the slave units 11 to 15 to receive the flag data (S1).
2). Thereby, master device 10 and slave devices 11 to 15
It has a SW flag set to the same flag data, and thereafter performs communication while checking the SW flag, thereby performing communication at the same carrier frequency.

That is, for example, when the master unit 10 calls a specific slave unit 11 to perform communication, the master unit 10 executes a call processing routine of FIG. When the call processing routine is executed, first, the communication mode is set, the power supply unit 36 shown in FIG. 1 starts power supply to each unit of the wireless communication unit 1, the maximum channel count value Cmax is set to "L", and the channel set value is set. S is “1” and channel count value C
Is set to "1" (S21).

Next, a second PLL control process is executed so as to control the second PLL local oscillator 37 (S22). That is, as shown in FIG. 10, the second spreading code g1 of the channel C1 in FIG. 6 is output from the second hop table 35b to the second PLL local oscillator 37 (S41). Then, it is determined whether or not the SW flag of the channel C1 is set to ON (S42), and if it is set to ON (S42, YE
S), outputs an “ON” PLL control signal h to output the second PL
The L local oscillator 37 is activated, and the second PLL local oscillator 37 outputs the second spread signal s2 of the carrier frequency (g1) to the up-converter 23 (S43). On the other hand, SW
If the flag is set to OFF (S42, NO),
The PLL control signal h of “OFF” is output to stop the second PLL local oscillator 37 (S44).

Thereafter, the process returns to the calling processing routine of FIG. 9 and outputs the transmission command signal p to the modem 22 and the transmission / reception switch 27, thereby allowing the modulation unit 2 of the modem 22 to
2a is set to the operation state, and the transmission / reception switch 27 is set to the transmission state. Also, the channel set value S is "1".
The hop signal r of the first hop table 26 and the first P
By outputting to the LL local oscillator 25, the first channel C1
The spread code f1 is output to the PLL local oscillator 25, and the first spread signal s1 having the carrier frequency (f1) corresponding to the first spread code f1 is output from the first PLL local oscillator 25 to the up converter 23 and the down converter 32.

Next, a calling signal including the ID data of the base unit 10 on the calling side and the ID data of the slave unit 11 on the called side is taken into the modem 22 via the interface unit 21 and is modulated by the modulation unit 22a. , To the up-converter 23 as a modulated signal t. Then, in the up-converter 23, the modulation signal t and the first spread signal s1 from the first PLL local oscillator 25 are added, and
If the second spread signal s2 is input from the second PLL local oscillator 37, the second spread signal s2 is also added to form a spread modulation signal u having a carrier frequency (f1) or a carrier frequency (f1 + g1). Let it. Thereafter, the spread modulation signal u is amplified by the power amplifier 24, and then the transmission / reception switch 27
(S23).

When the paging transmission is completed, a demodulation section 22b of the modem 22 is set to an operation state by outputting a reception command signal q to the modem 22 and a transmission / reception switch 27, and the transmission / reception switch 27 is set to a reception state. (S2
4), it is determined whether a response signal from the slave unit 11 has been received (S25). If there is no response (S25, N
O), it is determined whether or not the channel count value C is smaller than the maximum channel count value Cmax ("L") (S26), and if it is smaller (S26, YE).
S) While the channel set value S and the channel count value C are counted up by "1" (S27), if not small (S26, NO), the channel set value S and the channel count value C are reset to "1". (S28). When a predetermined dwell time elapses by an internal timer or the like (not shown), the channel set value S
Is transmitted to the hop table 26 and the PLL.
After output to the local oscillator 25 and frequency hopping (S29), the process is re-executed from S22 to continue the calling process.

The slave unit 11 on the called side forms a carrier frequency (f1) / (f1 + g1) corresponding to the channel C1, for example, based on the SW flag, and stands by for reception. At this time, the SW flag of the slave unit 11 is set to the same SW flag state as that of the master unit 10 by the SW flag setting process of FIG. Accordingly, the slave unit 11 is configured such that the master unit 10
No matter which carrier frequency (f1) / (f1 + g1) is used to transmit the call signal based on the flag, the same carrier frequency (f1) / (f1 +
Since the reception is waiting at g1), the call signal can be received reliably. Then, based on the ID data included in the calling signal, the slave unit 11 confirms that the slave unit 11 is calling itself, and transmits a response signal to the master unit 10. When the master unit 10 transmits a response signal from the slave unit 11, Is received (S25, YES), the second PLL control process is executed to control the second PLL local oscillator 37 (S30).

Thereafter, it is determined whether or not the channel count value C is smaller than the maximum channel count value Cmax ("L") (S31).
31, YES), while incrementing the channel set value S and the channel count value C by "1" (S3).
2) If it is not a small value (S31, NO), the channel set value S and the channel count value C are reset to "1" (S33). When the dwell time elapses by an internal timer or the like (not shown), the hop signal r indicating the channel set value S is transmitted to the hop table 26 and P
The signal is output to the LL local oscillator 25 and subjected to frequency hopping (S34), thereby transmitting (S35) and receiving (S3) at the carrier frequency (f2) / (f2 + g2) of the next channel C2.
6) Yes.

Thereafter, it is determined whether or not the communication has been completed (S37). If the communication has not been completed (S37, NO), the process proceeds to S37.
By re-executing from step 30, communication data transmission / reception is continued while performing frequency hopping for each residence time,
When the communication is completed (S37, YES), this routine is completed and the mode is shifted to the sleep mode. Thereby, as shown in FIG. 11, for example, S of channels C1, C2, C4, C5
The W flag is set to “OFF” and the SW of channel C3 is
Assuming that the flag is set to "ON", the second PLL local oscillator 37 is used for the channels C1, C2, C4, and C5.
Is stopped, communication is performed at the carrier frequency (f1, f2, f4, f5) of the first hop table 26.
On the other hand, in the channel C3, the second PLL local oscillator 37 is activated to output the second spread signal s2 having the carrier frequency (g3) to the up-converter 23.
90 KHz carrier frequency (g3) to 00 MHz carrier frequency (f3)
Communication is performed at the carrier frequency (f3 + g3) to which is added.

As described above, the wireless communication device according to the present embodiment, as shown in FIG.
Determination means (error rate table 35a, error rate calculation unit 35c) for determining whether or not interference has occurred with respect to all carrier frequencies (f1, f2,... FL) of hop table 26 beyond a predetermined value;
Frequency storage means for storing the carrier frequency determined to be interfered by setting the SW flag in FIG.
When the carrier frequency (f1, f2,... FL) of the hopping pattern coincides with the carrier frequency determined to have been interfered in the frequency storage means by checking the hop table 35b) and the SW flag, A frequency changing means (second PLL local oscillator 37) for adding the second spread signal s2 to the one spread signal s1 and changing to another carrier frequency is provided.

Thus, when the carrier frequency (f1, f2,... FL) of the hopping pattern is changed to another carrier frequency by the frequency changing means, if this change amount is adjusted, the carrier used in the communication processing can be adjusted. The frequency can be set to any frequency. Therefore, even if the range of selection of the carrier frequency used in the communication processing is expanded to the number of hops of the hopping pattern or more, it is only necessary to adjust the change amount to another carrier frequency in the frequency changing means, so that interference is determined. Since the number of times of the hopping pattern is limited to the number of hops, the carrier frequency used for the communication can be determined in a fixed time.

Further, the above-mentioned frequency changing means is provided in FIG.
As shown in the figure, each carrier frequency of the hopping pattern (f1,
The carrier frequency is changed to (f3 + g3) between f2, ... fL). As a result, the carrier frequency can be flexibly changed according to the state of the interference, and the utilization efficiency of the carrier frequency can be improved.

In this embodiment, when the internal timer (not shown) recognizes that the set time has elapsed, the SW flag setting processing routine shown in FIG. 8 is executed to periodically change the carrier frequency with little interference. And good communication can be stably performed.

In the present embodiment, the SW flag setting routine shown in FIG. 8 is executed before the start of communication. However, the present invention is not limited to this, and is executed during communication. It may be. In this case, when the interfering carrier frequency is detected during communication, the carrier frequency can be changed by a simple process of transmitting flag data so as to set the SW flag to “ON”. With high-speed processing, good communication can be stably performed even during a series of communication.

[0048]

According to a first aspect of the present invention, there is provided a radio communication device for performing bidirectional communication while switching a carrier frequency in accordance with a hopping pattern including a plurality of carrier frequencies, wherein interference occurs in all carrier frequencies of the hopping pattern at a predetermined level or more. Judgment means to determine whether or not, frequency storage means to store the carrier frequency determined to be interfered, when the carrier frequency of the hopping pattern matches the carrier frequency of the frequency storage means, Frequency changing means for changing the carrier frequency to another carrier frequency. Thus, when changing the carrier frequency of the hopping pattern to another carrier frequency by the frequency changing unit, by adjusting the amount of change, the carrier frequency used in the communication processing can be set to an arbitrary frequency. Therefore, even if the range of selection of the carrier frequency used in the communication processing is expanded to the number of hops of the hopping pattern or more, it is only necessary to adjust the change amount to another carrier frequency in the frequency changing means, so that interference is determined. Since the number of times is limited to the number of hops in the hopping pattern,
There is an effect that the carrier frequency used for communication can be determined in a fixed time.

According to a second aspect of the present invention, in the wireless communication device according to the first aspect, the frequency changing means changes the carrier frequency between carrier frequencies of the hopping pattern. Accordingly, the carrier frequency can be flexibly changed according to the state of the interference, and the use efficiency of the carrier frequency can be improved.

According to a third aspect of the present invention, there is provided the wireless communication device according to the first or second aspect, further comprising a first setting management unit for periodically performing the determination by the determination unit. This makes it possible to determine whether or not interference is periodically made for all carrier frequencies, so that good communication can be stably performed.

According to a fourth aspect of the present invention, there is provided the wireless communication device according to the first or second aspect, further comprising a second setting management means for making the determination by the determination means during communication. Thereby, when a carrier frequency that is being interfered is detected during communication, a simple process of storing the corresponding carrier frequency in the frequency storage means can be performed at a high speed. There is an effect that good communication can be stably performed.

[Brief description of the drawings]

FIG. 1 is a block diagram of a wireless communication unit.

FIG. 2 is an explanatory diagram showing a relationship between a parent device and a child device.

FIG. 3 is an explanatory diagram showing a communication mode according to the TDD scheme.

FIG. 4 is an explanatory diagram showing the contents of a first hop table.

FIG. 5 is an explanatory diagram showing the contents of an error rate table.

FIG. 6 is an explanatory diagram showing the contents of a second hop table.

FIG. 7 is an explanatory diagram showing the contents of test data and checksum data.

FIG. 8 is a flowchart of a SW flag setting processing routine.

FIG. 9 is a flowchart of a call processing routine.

FIG. 10 is a flowchart of a second PLL control processing routine.

FIG. 11 is an explanatory diagram showing a state of a carrier frequency changed by a SW flag.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 wireless communication unit 10 master unit 11 to 15 slave unit 21 interface unit 22 modem 23 up converter 24 power amplifier 25 first PLL local oscillator 26 first hop table 27 transmission / reception switch 28 antenna 31 low noise amplifier 32 down converter 35 controller 35a error Rate table 35b Second hop table 35c Error rate calculation unit 36 Power supply unit 37 Second PLL local oscillator

Claims (4)

[Claims] 1. A wireless communication device that performs two-way communication while switching a carrier frequency according to a hopping pattern including a plurality of carrier frequencies, and determines whether or not all carrier frequencies of the hopping pattern are interfered by a predetermined amount or more. Determining means for storing, a frequency storing means for storing a carrier frequency determined to be interfered with, and, when the carrier frequency of the hopping pattern matches the carrier frequency of the frequency storing means, the carrier frequency is changed to another carrier. A wireless communication device comprising: frequency changing means for changing to a frequency. 2. The wireless communication device according to claim 1, wherein the frequency changing unit changes the carrier frequency between carrier frequencies of the hopping pattern. 3. The wireless communication device according to claim 1, further comprising: a first setting management unit configured to periodically perform the determination by the determination unit. 4. The wireless communication device according to claim 1, further comprising a second setting management unit for making a determination by said determination unit during communication.