JP2001244851A - Transmitter/receiver for frequency hopping communication and frequency hopping communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmitter/receiver for a frequency hopping communication system and a frequency hopping communication method which can avoid a decrease in throughput. SOLUTION: The transmitter/receiver for the frequency hopping communication system which generates a hopping pattern specifying frequencies to be used for transmission and reception in order and switches oscillation frequencies according to the control frequency specified by the hopping pattern is equipped with an interference wave frequency storage means which stores the interference frequency of an interference source and a hopping pattern generating means which generates a hopping pattern avoiding the interference frequency by referring to the known interference frequency stored in the interference frequency storage and generates a control frequency based upon it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency hopping (FH) communication system for performing communication while suppressing the influence of frequency interference for switching a transmission frequency based on a hopping pattern in a digital radio communication system. The present invention relates to a transmission / reception apparatus for a frequency hopping communication system and a frequency hopping communication method for performing communication while avoiding the influence of known interference.

[0002]

2. Description of the Related Art The FH communication system is a system for transmitting and receiving information while switching a plurality of transmission frequencies. The transmission frequency is switched according to the same hopping pattern synchronized between the transmitter and the receiver. In the FH communication system, information transmission is performed using a hopped transmission frequency. Therefore, when frequency interference is added, only the interference frequency and the hit transmission frequency are affected. The conventional FH communication system can reduce the transmission time at the transmission frequency that hits the interference in the case of interference whose frequency is unknown. Conventionally, ISM (Industrial, Scientific and Me
dial) is often used in wireless LANs in bands. In a wireless LAN, packet communication is generally used. However, when the FH communication method is applied to packet communication,
Immunity to unknown frequency interference is likewise considered. Packets sent on the frequency that hit the interference frequency
Although affected by interference, packets transmitted after the switching of the transmission frequency can avoid the influence of the interference frequency. As in the above-mentioned ISM band, even when it is unknown at which frequency the interference occurs, the FH communication system that hops the transmission frequency uniformly has excellent interference resistance.

FIG. 14 is a block diagram of a transmission / reception circuit used in a conventional FH communication system. After the synchronization of the hopping pattern assigned to each station is established, the transmission frequency is uniformly switched within the transmission bandwidth according to the hopping pattern, and the signal transmission / reception is performed. Here, a state in which unknown frequency interference (f4) is added to the transmission band of the FH communication system is shown in FIG. FH communication system is uniform within the transmission band,
The transmission frequency is switched in the order of f1, f2, f5, f3, f4, and transmission is performed while avoiding unknown interference. If the interference frequency is unknown, the transmission frequency to be hit is not known, and by hopping uniformly, it is possible to suppress the influence from the interference and avoid the influence of the decrease in the throughput (Reference: Dr.
aft International Standard ISO / IEC 8802-11, IEEE P8
02.11 / D8.0, 1 May 1998).

[0004] There are a number of methods for realizing a conventional transmitting / receiving apparatus for the FH communication system. Here, FIG. 14 shows an example of a configuration for performing frequency conversion after switching a transmission frequency using a synthesizer circuit.

The operation of the conventional transmission circuit in the FH communication system shown in FIG. 14 is described below. The hopping pattern generation circuit 1 sets a hopping pattern for each station, and outputs a control frequency s1 corresponding to the hopping pattern. The control frequency s1 is input to the synthesizer circuit 2, and the synthesizer circuit 2 switches the synthesizer output signal s2 based on the control frequency s1, thereby realizing uniform hopping within the transmission band. On the other hand, the transmission data s3 is input to the modulation circuit 3, and outputs a modulation signal s4 for modulating the transmission data. In the frequency conversion circuit 4,
The modulation signal s4 and the synthesizer output signal s2 are input, the transmission frequency is converted, and the transmission FH signal s5 is output. On the other hand, a receiver can be realized with a similar configuration up to a synthesizer.

As described above, a configuration other than that shown in FIG. 14 can be considered for the transceiver for the FH communication system. For example, when the modulation signal is FSK (Frequency Shift Keying) or the like,
Instead of a circuit configuration for frequency conversion using the frequency conversion circuit 4, a voltage controlled oscillator (VCO) in a synthesizer circuit
It is also possible to realize a configuration in which transmission data is directly added to the control signal input to perform FSK modulation, and a control frequency according to a hopping pattern is input to the synthesizer circuit.

As described above, in the transmitting / receiving apparatus for the FH communication system shown in FIG. 14, a control frequency based on the same hopping pattern synchronized between the transmitter and the receiver is input to the synthesizer, and one of the control frequencies within the transmission bandwidth is transmitted. Signals are transmitted and received while switching the frequency in such a manner. By switching the transmission frequency, when frequency interference due to an unknown frequency such as an ISM band is added, the influence of the interference can be suppressed and the deterioration of the system throughput can be suppressed.

[0008]

With respect to frequency interference of an unknown frequency that frequently occurs in the ISM band, it is effective to perform information transmission in which the transmission frequency is switched by a control frequency that hops uniformly in the transmission band. is there.

However, when the interference frequency is fixed, when the transmission frequency is switched in accordance with a uniform hopping pattern, the interference frequency and the transmission frequency are constantly hit, thereby lowering the system throughput.

If the frequency of the frequency interference is fixed, if the frequency is known, hopping is performed to avoid a frequency at which a steady frequency hit is expected, thereby reducing the system throughput. Deterioration can be expected to be suppressed.

In outdoor use, fixed wireless access (FWA) between a base station and a fixed subscriber station.
Access) is being studied for application of the FH communication method. In the outdoors, the method of using radio waves is often specified, and the frequency of interference is fixed and known in many cases. These interference sources may also have a transmission cycle that varies with time.
One of the interference sources is a weather radar. Since the transmission output of a weather radar is very large, about 250 kW (about 84 dBm), if the transmission frequency of the FH communication system and the radar frequency hit, the FH communication system is significantly affected.

In order to avoid this problem, similarly, the transmission frequency is hopped by avoiding the frequency used by the interference source and the transmission time, and the transmission timing of the FH communication system is set to the transmission period of the interference. By controlling the transmission so that they do not coincide with each other, it is possible to suppress the deterioration of the system throughput.

However, in the conventional FH communication system, hopping is performed uniformly in the transmission band so that the hopping pattern suppresses the influence on unknown frequency interference. Despite the expectation, there is a problem that the system throughput must be degraded because the frequency must be used.

For an interference source having a very large transmission power, such as the above-mentioned weather radar, the side lobe of the spectrum may spread to a frequency band other than the interference frequency. In this state, even when the interference frequency and the transmission frequency of the FH communication method do not hit, there is a problem that the system may be affected by the interference source and the throughput of the system may be reduced.

The present invention has been made in view of the above-described problems. When an interference frequency is known, the use of this frequency is avoided to suppress a decrease in throughput, and a side lobe accompanying transmission of an interference source is suppressed. Provided is a transmission / reception apparatus for a frequency hopping communication method and a frequency hopping communication method capable of avoiding a decrease in throughput by stopping transmission of the FH communication method during a period in which the interference is transmitted even when the influence is large. The purpose is to:

[0016]

According to the conventional configuration, the transmission frequency is switched based on a uniform hopping pattern to avoid unknown frequency interference. However, since the frequency cannot be avoided in advance, there is a problem that the throughput is reduced.

Therefore, in the present invention, when the interference frequency is known, the decrease in throughput is suppressed by avoiding the use of the interference frequency, and the side lobe of the interference transmitted at other frequencies is reduced by the transmission frequency of the FH communication system. Even when the interference has a large effect, the time when this interference transmits a signal is
The H communication system solves the above-described problem by avoiding a decrease in throughput by performing timing control for stopping signal transmission.

In the invention described in claim 1 of the present invention,
A hopping pattern that avoids a known interference frequency is generated by referring to an output signal of an interference wave frequency storage unit, and a control frequency according to the hopping pattern is generated.

According to the first aspect of the present invention, the hopping pattern is generated such that the interference frequency does not coincide with the transmission frequency by referring to the frequency of the circuit storing the known interference frequency. Specifically, it is as follows. FIG. 12 shows a state of transmission of the FH communication system that avoids this frequency when there is known frequency interference. When the known interference is at frequency f4, frequency f4 is avoided, hopping patterns are set to f1, f2, f5, and f3, and the transmission frequency is switched according to this to perform transmission. I have.

In the invention described in claim 2 of the present invention,
The output signal of the interference signal timing receiving means and the output signal of the interference wave frequency storage means, which are known from the interference source,
A known interference frequency at which the interference signal is transmitted and a hopping pattern that avoids the time for the interference source to transmit the signal can be generated, and an arbitrary periodic hopping pattern can be regenerated, and the transmission / reception timing according to this is possible. Is used to generate a control frequency.

According to the second aspect of the present invention, a hit with the interference frequency is avoided by referring to the frequency of the circuit storing the known interference frequency. Further, it is assumed that timing information is known when an interference signal is intermittently transmitted from an interference source, and the timing information is received and the frequency and time at which the interference source transmits a signal are assumed. Two-dimensional mapping becomes possible. The timing information known at this time may be known by wire or wireless. Transmission at the timing when the interference source transmits the signal stops. A hopping pattern based on such mapping is generated and a control frequency is output. This mapping can be regenerated at any period.

FIG. 13 shows a state of transmission based on this mapping. Since it is known that the known interference is f4, f4 is avoided and f1, f2, f5, and f3 are avoided.
The transmission frequency is switched in the order shown in FIG. Also,
When the transmission timing of the interference source is known and the influence of the side lobe is large, signal transmission at the transmission timing of the interference source is avoided as shown in FIG.
The figure shows a case where transmission at f4 is constantly avoided, but only when interference is intermittently transmitted, the FH communication system uses f4 at the timing when the interference source does not transmit at f4. It is also possible to send.

According to the invention described in claim 3 of the present invention,
Refer to the output signal of the interference wave frequency storage means, input the output signal of the interference signal timing detection means for measuring the frequency of the interference source, and the known interference frequency at which the interference signal is being transmitted and the time at which the interference source transmits It is possible to generate a hopping pattern avoiding the above and to regenerate the hopping pattern at an arbitrary cycle, and to generate a control frequency at a transmission / reception timing according to the hopping pattern.

According to the third aspect of the present invention, a hit with the interference frequency is avoided by referring to the frequency of the circuit storing the known interference frequency. Also, it is assumed that the interference signal is intermittently transmitted from the interference source, and the interference frequency is measured based on the information on the interference frequency, and the timing at which the interference source transmits the signal is measured. This enables two-dimensional mapping of frequency and time for transmitting the interference signal. Transmission at the timing when the interference source transmits the signal stops. In this way, a hopping pattern based on the mapping of the interference signal is generated and a control frequency is output.

In the invention described in claim 4 of the present invention,
Reference is made to the output signal of the interference wave frequency storage means, and the output signal of the interference signal timing detection means for observing the transmission band is input, and the known interference frequency at which the interference signal is transmitted and the time at which the interference source transmits It is possible to generate a hopping pattern avoiding the above, and to regenerate the hopping pattern at an arbitrary cycle, and to generate a control frequency at a transmission / reception timing according to the hopping pattern.

According to the fourth aspect of the present invention, a hit with the interference frequency is avoided by referring to the frequency of the circuit storing the known interference frequency. Also, it is assumed that the interference signal is intermittently transmitted from the interference source, and the frequency within the transmission bandwidth is measured to measure the timing at which the interference source transmits the signal. This enables two-dimensional mapping of frequency and time for transmitting the interference signal. If the influence of the side lobe at the desired transmission frequency is large at the timing when the interference source transmits the signal, the transmission at this timing is stopped. In this way, a hopping pattern based on the mapping of the interference signal is generated and a control frequency is output. This mapping can be regenerated at any period.

According to the invention described in claim 5 of the present invention,
With reference to the output signal of the interference wave frequency storage means, the output signal of the interference signal timing detection means at the frequency of the interference source and the output signal of the interference signal timing reception means known from the interference source are input, and the interference signal is transmitted. It is possible to generate a hopping pattern that avoids the known interference frequency and the transmission time of the interference source, and it is possible to regenerate the hopping pattern at an arbitrary cycle, and to generate the control frequency at the transmission / reception timing according to this. It is characterized by doing.

According to the fifth aspect of the present invention, a hit with the interference frequency is avoided by referring to the frequency of the circuit storing the known interference frequency. Also, it is assumed that the interference signal is intermittently transmitted from the interference source, and that the timing information is known, and that the timing information is received and the two-dimensional frequency and time for transmitting the interference signal is assumed. Mapping becomes possible. At this time, the timing signal to be frequency may be known by wire or wireless. Also, separately measure the interference frequency based on the information of the interference frequency, measure the timing at which the interference source transmits a signal,
Improve the accuracy of the time measurement when the interferer transmits the signal.
This enables two-dimensional mapping of frequency and time for transmitting the interference signal. Transmission at the timing when the interference source transmits the signal stops. In this way, a hopping pattern based on the mapping of the interference signal is generated and a control frequency is output. This mapping can be regenerated at any period.

In the invention according to claim 6 of the present invention, the output signal of the interference signal timing detecting means in the transmission band is referred to the interference signal known from the interference source by referring to the output signal of the interference wave frequency storing means. Inputting the output signal of the signal timing receiving means, generating a known interference frequency at which the interference signal is transmitted and a hopping pattern avoiding the time of transmission by the interference source, and regenerating the hopping pattern at an arbitrary cycle It is characterized in that the control frequency is generated at the transmission / reception timing according to this.

According to the sixth aspect of the present invention, a hit with the interference frequency is avoided by referring to the frequency of the circuit storing the known interference frequency. Also, it is assumed that the interference signal is intermittently transmitted from the interference source and that the timing information is known. When the timing information is received, the interference source transmits the interference signal in the frequency and time intervals. Dimension mapping becomes possible. The timing signal known at this time may be wired or wirelessly known. Also, the frequency within the transmission bandwidth is measured, and the timing at which the interference source transmits a signal is measured. Transmission at the timing when the interference source transmits the signal stops. Alternatively, if the influence of the side lobe at the desired transmission frequency is large at the timing when the interference source transmits the signal, the transmission at this timing is stopped. In this way, a hopping pattern based on the mapping of the interference signal is generated and a control frequency is output. This mapping can be regenerated at any period.

According to the invention described in claim 7 of the present invention,
The output signal of the first interference signal timing detecting means for measuring the frequency of the interference source with reference to the output signal of the interference wave frequency storing means, and the output of the second interference signal timing detecting means for measuring the frequency within the transmission band A signal is input, a known interference frequency at which the interference signal is being transmitted, and a hopping pattern that avoids the time of transmission of the interference source is generated, and the hopping pattern can be regenerated at an arbitrary cycle. It is characterized in that a control frequency is generated at the following transmission / reception timing.

According to the seventh aspect of the present invention, a hit with the interference frequency is avoided by referring to the frequency of the circuit storing the known interference frequency. Also, it is assumed that the interference signal is intermittently transmitted from the interference source, and the frequency within the transmission bandwidth is measured to measure the timing at which the interference source transmits the signal. This enables two-dimensional mapping of frequency and time for transmitting the interference signal. Also, the interference frequency is separately measured based on the information on the interference frequency, the timing at which the interference source transmits a signal is measured, and the accuracy of time measurement during which the interference source transmits the signal is improved. Transmission at the timing when the interference source transmits the signal stops. Alternatively, if the influence of the side lobe at the desired transmission frequency is large at the timing when the interference source transmits the signal, the transmission at this timing is stopped. In this way, a hopping pattern based on the mapping of the interference signal is generated and a control frequency is output. This mapping can be regenerated at any period.

In the invention described in claim 8 of the present invention,
The output signal of the first interference signal timing detecting means for measuring the frequency of the interference source with reference to the output signal of the interference wave frequency storing means, and the output of the second interference signal timing detecting means for measuring the frequency within the transmission band A signal and an output signal of an interference signal timing receiving means known from an interference source,
A known interference frequency at which the interference signal is transmitted, and a hopping pattern that avoids the transmission time of the interference source is generated, and the hopping pattern can be regenerated at an arbitrary cycle. It is characterized in that a control frequency is generated.

According to the eighth aspect of the present invention, a hit with the interference frequency is avoided by referring to the frequency of the circuit storing the known interference frequency. Also, it is assumed that the interference signal is intermittently transmitted from the interference source and that the timing information is known. When the timing information is received, the interference source transmits the interference signal in the frequency and time intervals. Dimension mapping becomes possible. The timing signal known at this time may be wired or wirelessly known. Also, the interference frequency and the frequency in the transmission band are separately measured based on the information on the interference frequency, the timing at which the interference source transmits a signal is measured, and the accuracy of the time measurement during which the interference source transmits the signal is improved. Transmission at the timing when the interference source transmits the signal stops. Alternatively, if the influence of the side lobe at the desired transmission frequency is large at the timing when the interference source transmits the signal, the transmission at this timing is stopped. In this way, a hopping pattern based on the mapping of the interference signal is generated and a control frequency is output. This mapping can be regenerated at any period.

According to the ninth aspect of the present invention,
Transmission packet generation means for generating a transmission packet of an arbitrary length composed of modulated transmission data can be generated. An output signal of the hopping pattern generation means is input, and an interference signal transmitted from an interference source is transmitted. The transmission is performed by defining the packet length so that the packets do not collide.

According to the ninth aspect of the present invention, the frequency and the time related to the transmission of the interference signal are based on the timing information from the interference source and the timing information obtained by observing the interference frequency and the frequency within the transmission bandwidth. The two-dimensional mapping is created, and the time of the packet to be transmitted is controlled based on this mapping to perform transmission.

According to the tenth aspect of the present invention, when setting a hopping pattern for controlling a frequency and a time used for data transmission / reception, when a known frequency interference does not exist, a transmission band is set. Set a hopping pattern that hops uniformly within the width, perform data transmission and reception while performing frequency switching according to this hopping pattern, and if there is a known frequency interference and the transmission timing of the interference cannot be determined, A hopping pattern that avoids a known interference frequency is set, and data is transmitted and received while performing frequency switching according to the hopping pattern. If there is known frequency interference and the transmission timing of the interference can be determined, the interference Generates a time table of the frequency and time that avoids the interference frequency and time being transmitted. And sets the hopping pattern based on this, and performs data transmission and reception while switching the frequency in consideration of the signal transmission time in accordance with this hopping pattern.

According to the tenth aspect of the present invention, when there is no known interference frequency, a hopping pattern for uniformly hopping in a transmission band is set in order to improve resistance to unknown interference. And communicate. On the other hand, if there is a frequency whose interference frequency is known and its transmission timing cannot be determined, transmission and reception are performed using a hopping pattern avoiding that frequency. If the interference frequency is known and its transmission timing is received from the interference source, or the timing can be detected and determined, the hopping pattern that avoids the interference frequency and the transmission timing of the interference source is used. The transmission and reception are performed while controlling the transmission timing according to the hopping pattern. That is, at the time of data transmission / reception, transmission / reception is performed while appropriately selecting at least one of these three transmission / reception.

As described above, in all claims, the case where the interference frequency is stored in the interference wave frequency storage circuit and the hopping pattern is generated while referring to the interference frequency is described.
It is, of course, possible to generate a hopping pattern in a stage where the hopping pattern generation circuit is implemented as a circuit, so that designation corresponding to an interference frequency due to hopping is not performed in advance.

Further, in all of the claimed inventions, it is possible to provide these devices in all base stations and subscriber stations, but in the case of a system in which installation at subscriber stations is not permitted due to the circuit scale. A method may be considered in which the base station generates a hopping pattern in consideration of frequency and time only in the base station, and notifies the subscriber station to the subscriber station by a known signal such as a beacon.

In the present invention, by providing the means described in each claim, when the frequency is known, the influence of frequency interference is avoided, and the transmission timing of the interference is received or detected from the interference station. By determining, the interference signal can be avoided, and a two-dimensional mapping in frequency and time for signal transmission can be created. By controlling the transmission timing based on this mapping, the throughput of the system can be reduced. A transmission / reception apparatus for a frequency hopping communication system and a frequency hopping communication method with reduced degradation can be realized.

[0042]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A transmitting and receiving apparatus for a frequency hopping communication system according to an embodiment of the present invention will be described below with reference to the drawings.

First, FIG. 1 shows a transmitting and receiving apparatus for the FH modulation system according to the first embodiment. Interference wave frequency storage circuit 1
At 01, interference frequency is stored and interference frequency information s101 is output. Hopping pattern generation circuit 1
In 02, a hopping pattern is generated with reference to the interference frequency information s101 so as to avoid the interference frequency. In the hopping pattern generation circuit 102, the synthesizer circuit 10
The control frequency s102 input to the control signal No. 3 is output.

As described above, the interference wave frequency storage circuit 101 and the hopping pattern generation circuit 102 are features of the transmission / reception apparatus for the frequency hopping modulation system described in the first embodiment. It corresponds to the pattern generation means.

In the synthesizer circuit 103, the transmission frequency s103 is hopped according to the control frequency s102, and is switched and output. The modulation signal s104 and the transmission frequency s103 are input to the frequency conversion circuit 104,
The modulation scheme signal s105 can be obtained.

Next, FIG. 2 shows a transmission / reception apparatus for the FH modulation system according to the second embodiment. The interference frequency storage circuit 201 stores the interference frequency and outputs interference frequency information s201. Timing information receiving circuit 20
In 5, the timing information s206 transmitted or known by the interference source is received, and the interference timing reception signal s207 indicating the transmission time of the interference signal is detected. The timing information s206 from the interference source may be transmitted in a wired or wireless manner. The hopping pattern generation circuit 202 generates a hopping pattern that avoids the interference frequency and the signal transmission time of the interference signal using the interference frequency information s201 and the interference timing reception signal s207, and is input to the synthesizer circuit 203 based on the hopping pattern. The control frequency s202 is output.

As described above, the interference wave frequency storage circuit 201, the timing information receiving circuit 205, and the hopping pattern generating circuit 202 are features of the transmitting and receiving apparatus for the frequency hopping modulation system described in the second embodiment. It corresponds to an interference wave frequency storage unit, an interference signal timing reception unit, and a hopping pattern generation unit.

The synthesizer circuit 203 hops and switches the transmission frequency s203 according to the control frequency s202 and outputs it. The modulation signal s204 and the transmission frequency s203 are input to the frequency conversion circuit 204,
The modulation scheme signal s205 can be obtained.

FIG. 3 shows an embodiment of the transmitting and receiving apparatus for the FH modulation system according to the third embodiment. The interference frequency storage circuit 301 stores interference frequencies and outputs interference frequency information s301. The interference frequency timing detection circuit 305 refers to the interference frequency information s306, measures the interference frequency s306, and measures the transmission time of the interference source. The transmission time is detected and determined by this measurement, and an interference timing detection signal s307 indicating the transmission time of the interference signal is detected. Hopping pattern generation circuit 30
2 generates a hopping pattern that avoids the interference frequency and the signal transmission time of the interference signal using the interference frequency information s301 and the interference timing detection signal s307, and generates a control frequency s302 input to the synthesizer circuit 303 based on the hopping pattern. Output.

As described above, the interference wave frequency storage circuit 301, the interference frequency timing detection circuit 305, and the hopping pattern generation circuit 302 are features of the transmission / reception apparatus for the frequency hopping modulation system described in the third embodiment. Each corresponds to an interference wave frequency storage unit, an interference signal timing detection unit, and a hopping pattern generation unit.

The synthesizer circuit 303 hops the transmission frequency s303 in accordance with the control frequency s302, switches and outputs the hopped transmission frequency s303. Modulated signal s304 and transmission frequency s303 are input to frequency conversion circuit 304,
A modulation scheme signal s305 can be obtained.

Next, FIG. 4 shows a transmitting / receiving apparatus for an FH modulation system according to a fourth embodiment. The interference frequency storage circuit 401 stores the frequency of the interference and outputs interference frequency information s401. The transmission band frequency timing detection circuit 405 measures the transmission band frequency s406 and measures the transmission timing of the interference source. In this measurement, the influence of the side lobe on the transmission band frequency of the interference frequency can be measured. Based on this, the transmission timing of the interference signal is detected and determined, and an interference timing detection signal s407 indicating the transmission time of the interference signal is output. The hopping pattern generation circuit 402 generates a hopping pattern that avoids the interference frequency and the signal transmission time of the interference signal using the interference frequency information s401 and the interference timing detection signal s407, and is input to the synthesizer circuit 403 based on the hopping pattern. The control frequency s402 is output.

As described above, the interference wave frequency storage circuit 401, the transmission band frequency timing detection circuit 405, and the hopping pattern generation circuit 402 are features of the transmission / reception apparatus for the frequency hopping modulation system described in the fourth embodiment. Respectively correspond to an interference wave frequency storage unit, an interference signal timing detection unit, and a hopping pattern generation unit.

In the synthesizer circuit 403, the transmission frequency s403 is hopped and switched according to the control frequency s402, and is output. The modulation signal s404 and the transmission frequency s403 are input to the frequency conversion circuit 404,
The modulation scheme signal s405 can be obtained.

Next, FIG. 5 shows a transmitting / receiving apparatus for an FH modulation system according to a fifth embodiment. The interference frequency storage circuit 501 stores interference frequencies and outputs interference frequency information s501. Timing information receiving circuit 50
In 5, the timing information s 506 transmitted or known by the interference source is received, and the interference timing reception signal s 507 indicating the transmission time of the interference signal is detected. The timing information s506 from the interference source may be transmitted in a wired or wireless manner. The interference frequency timing detection circuit 508 refers to the information of the interference frequency information s501, measures the interference frequency s508, and measures the transmission time of the interference source. This measurement allows the detection of transmission time,
The determination is performed, and an interference timing detection signal s509 indicating the transmission time of the interference signal is detected. The hopping pattern generation circuit 502 includes an interference frequency information s501, an interference timing reception signal s507, and an interference timing detection signal s5.
09 is used to generate a hopping pattern that avoids the interference frequency and the signal transmission time of the interference signal. Based on this, the control frequency s502 input to the synthesizer circuit 503 is generated.
Is output.

As described above, the interference wave frequency storage circuit 501, the timing information reception circuit 505, the interference frequency timing detection circuit 508, and the hopping pattern generation circuit 502
This is a feature of the transmitting and receiving apparatus for a frequency hopping modulation system according to the fifth embodiment, and corresponds to an interference wave frequency storage unit, an interference signal timing detection unit, an interference signal timing reception unit, and a hopping pattern generation unit, respectively. ing. The synthesizer circuit 503 hops and switches the transmission frequency s503 according to the control frequency s502 and outputs it. The modulation signal s504 and the transmission frequency s503 are input to the frequency conversion circuit 504,
An FH modulation signal s505 can be obtained.

Next, FIG. 6 shows a transmitting / receiving apparatus for an FH modulation system according to a sixth embodiment. The interference frequency storage circuit 601 stores the frequency of the interference and outputs interference frequency information s601. Timing information receiving circuit 60
In 5, the timing information s606 transmitted or known by the interference source is received, and the interference timing reception signal s607 indicating the transmission time of the interference signal is detected. The timing information s606 from the interference source may be transmitted in a wired or wireless manner. The transmission band frequency timing detection circuit 608 measures the transmission timing of the interference source. In this measurement, the influence of the side lobe on the transmission band frequency of the interference frequency can be measured. An interference timing detection signal s indicating the transmission time of the interference signal by detecting and determining the transmission timing of the interference signal based on this.
609 is output. Hopping pattern generation circuit 602
Generates a hopping pattern that avoids the interference frequency and the signal transmission time of the interference signal using the interference frequency information s601, the interference timing reception signal s607, and the interference timing detection signal s609, and is input to the synthesizer circuit 603 based on this. The control frequency s602 is output.

As described above, the interference wave frequency storage circuit 601, the timing information reception circuit 605, the interference source frequency timing detection circuit 608, and the hopping pattern generation circuit 602
Is a feature of the transmitting and receiving apparatus for the frequency hopping modulation system described in the sixth embodiment, and includes an interference wave frequency storage unit, an interference signal timing detection unit, an interference signal timing reception unit, and a hopping pattern generation unit. Yes, it is.

In the synthesizer circuit 603, the transmission frequency s603 is hopped according to the control frequency s602, and is switched and output. The modulation signal s604 and the transmission frequency s603 are input to the frequency conversion circuit 604,
The modulation scheme signal s605 can be obtained.

Next, FIG. 7 shows a transmission / reception apparatus for an FH modulation system according to a seventh embodiment. The interference wave frequency storage circuit 701 stores interference frequencies and outputs interference frequency information s701. The interference frequency timing detection circuit 705 measures the interference frequency s706 with reference to the interference frequency information s701, and measures the transmission time of the interference source. The transmission time is detected and determined by this measurement, and the interference timing detection signal s707 at the interference frequency indicating the transmission time of the interference signal is detected. The transmission band frequency timing detection circuit 708 measures the transmission band frequency s708 and measures the transmission timing of the interference source. In this measurement, the influence of the side lobe on the transmission band frequency of the interference frequency can be measured. Based on this, the transmission timing of the interference signal is detected and determined, and an interference timing detection signal s709 indicating the transmission time of the interference signal is output. The hopping pattern generation circuit 702 generates interference frequency information s701,
Using the interference timing detection signal s707 at the interference frequency and the interference timing detection signal s709 at the transmission band, a hopping pattern that avoids the interference frequency and the signal transmission time of the interference signal is generated, and input to the synthesizer circuit 703 based on this. The control frequency s702 is output.

As described above, the interference wave frequency storage circuit 701, the interference frequency timing circuit 705, the transmission band frequency timing detection circuit 708, and the hopping pattern generation circuit 70
2 is a feature of the transmission / reception apparatus for the frequency hopping modulation system described in the seventh embodiment, and includes an interference wave frequency storage unit, a first interference signal timing detection unit, and a second interference signal timing reception signal. And hopping pattern generation means.

In the synthesizer circuit 703, the transmission frequency s703 is hopped according to the control frequency s702, and is switched and output. The modulation signal s704 and the transmission frequency s703 are input to the frequency conversion circuit 704,
A modulation scheme signal s705 can be obtained.

Next, FIG. 8 shows a transmitting and receiving apparatus for the FH modulation system according to the eighth embodiment. The interference wave frequency storage circuit 801 stores the frequency of the interference and outputs interference frequency information s801. Timing information receiving circuit 80
In 7, the timing information s806 transmitted or known by the interference source is received, and the interference timing reception signal s807 indicating the transmission time of the interference signal is detected. The timing information s806 from the interference source may be transmitted in a wired or wireless manner. The interference frequency timing detection circuit 805 refers to the interference frequency information s801, measures the interference frequency s808, and measures the transmission time of the interference source. The transmission time is detected and determined by this measurement, and the interference timing detection signal s809 at the interference frequency indicating the transmission time of the interference signal is detected. In the transmission band frequency timing detection circuit 808, the transmission band frequency s81
0 is measured and the transmission timing of the interference source is measured. In this measurement, the influence of the side lobe on the transmission band frequency of the interference frequency can be measured. The transmission timing of the interference signal is detected and determined based on this, and the interference timing detection signal s811 in the transmission band indicating the transmission time of the interference signal.
Is output. The hopping pattern generation circuit 802 uses the interference frequency information s801, the interference timing detection signal s809 at the interference frequency, and the interference timing detection signal s811 at the transmission band to generate a hopping pattern that avoids the interference frequency and the signal transmission time of the interference signal. The control frequency s 802 is generated and output to the synthesizer circuit 803 based on this.

As described above, the interference wave frequency storage circuit 801, the timing information receiving circuit 807, the interference frequency timing circuit 805, the transmission band frequency timing detection circuit 808, and the hopping pattern generation circuit 802 correspond to the frequency hopping described in the eighth embodiment. It is a feature of the transmitting and receiving apparatus for the modulation method, and corresponds to the interference wave frequency storing means, the interference signal timing receiving means, the first interference signal timing detecting means, the second interference signal timing receiving means and the hopping pattern generating means, respectively. are doing.

The synthesizer circuit 803 hops the transmission frequency s 803 according to the control frequency s 802, switches the transmission frequency s 803, and outputs it. Modulated signal s804 and transmission frequency s803 are input to frequency conversion circuit 804,
A modulation scheme signal s805 can be obtained.

Next, FIG. 9 shows a transmission circuit for the FH modulation system according to the ninth embodiment. The ninth embodiment is a configuration example in the case where the invention of the ninth embodiment is applied to the second embodiment. In the interference wave frequency storage circuit 901,
The frequency of interference is stored, and interference frequency information s901 is stored.
Is output. The timing information receiving circuit 905 receives the timing information s906 transmitted by the interference source or the known timing information s906, and detects the interference timing reception signal s907 indicating the transmission time of the interference signal. The timing information s906 from the interference source may be transmitted in a wired or wireless manner. The hopping pattern generation circuit 902 generates a hopping pattern avoiding the interference frequency and the signal transmission time of the interference signal using the interference frequency information s901 and the interference timing reception signal s907,
Based on this, the control frequency s902 input to the synthesizer circuit 903 is output. On the other hand, the packet generation circuit 9
In 06, the modulation signal s904 and the mapping signal s908 that avoids the transmission frequency and transmission time of the interference frequency generated by the hopping pattern generation circuit are input. In accordance with the mapping signal s908, a packet signal s909 whose time length is adjusted so that the interference signal and the transmission FH modulation signal do not collide is generated.

As described above, the packet generation circuit 906 is a feature of the transmission / reception apparatus for the frequency hopping modulation system described in the ninth embodiment, and corresponds to transmission packet generation means.

In the synthesizer circuit 903, the transmission frequency s903 is hopped according to the control frequency s902, and is switched and output. The packet signal s909 and the transmission frequency s903 are input to the frequency conversion circuit 904,
The FH modulation scheme signal s905 can be obtained.

In the transmission / reception apparatus for the FH communication system used in the ninth embodiment described above, a specific operation procedure for performing mapping in consideration of the transmission frequency and transmission time of the interference source in the hopping pattern generation circuit. Is shown in FIG.

First, when there is no frequency having a known interference frequency, a hopping pattern for uniformly hopping within a transmission band is set and communication is performed in order to improve resistance to unknown interference. On the other hand, when there is a frequency whose interference frequency is known and the transmission timing of the interference is unknown, transmission and reception are performed using a hopping pattern that avoids the frequency. If the interference frequency is known and its transmission timing is received from the interference source, or the timing can be detected and determined, the hopping pattern that avoids the interference frequency and the transmission timing of the interference source is used. Then, mapping is created so that transmission and reception are performed while controlling transmission timing according to the hopping pattern.

[0071]

As described above, when the interference frequency is known by using the present invention, the use of this frequency is avoided to suppress the decrease in throughput and to reduce the side lobe accompanying the transmission of the interference source. In the case where the influence of the interference is large, the transmission of the FH communication method is stopped during the period in which the interference is transmitted, so that it is possible to avoid a decrease in the throughput.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a first embodiment according to the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a second embodiment according to the present invention.

FIG. 3 is a block diagram showing a schematic configuration of a third embodiment according to the present invention.

FIG. 4 is a block diagram showing a schematic configuration of a fourth embodiment according to the present invention.

FIG. 5 is a block diagram showing a schematic configuration of a fifth embodiment according to the present invention.

FIG. 6 is a block diagram showing a schematic configuration of a sixth embodiment according to the present invention.

FIG. 7 is a block diagram showing a schematic configuration of a seventh embodiment according to the present invention.

FIG. 8 is a block diagram showing a schematic configuration of an eighth embodiment according to the present invention.

FIG. 9 is a block diagram showing a schematic configuration of a ninth embodiment according to the present invention.

FIG. 10 is a block diagram showing a schematic configuration of a tenth embodiment according to the present invention.

FIG. 11 is a diagram illustrating hopping in a conventional frequency hopping communication system.

FIG. 12 is a diagram illustrating a frequency hopping communication system that performs hopping while avoiding an interference frequency.

FIG. 13 is a diagram illustrating a frequency hopping communication system that performs hopping in consideration of transmission timing of interference.

FIG. 14 is a block diagram showing a configuration of a device using a conventional frequency hopping communication method.

[Explanation of symbols]

101, 201, 301, 401, 501, 601, 7
01,801,901 interference wave frequency storage circuit 102,202,302,402,502,602,7
02, 802, 902 hopping pattern generation circuit 103, 203, 303, 403, 503, 603, 7
03,803,903 Synthesizer circuit 104,204,304,404,504,604,7
04, 804, 904 Frequency conversion circuit 205 Timing information receiving circuit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masataka Iizuka 2-3-1 Otemachi, Chiyoda-ku, Tokyo Inside of Nippon Telegraph and Telephone Corporation (72) Inventor Masahiro Morikura 2-3-3, Otemachi, Chiyoda-ku, Tokyo No. 1 Nippon Telegraph and Telephone Corporation F-term (reference) 5K022 EE04 EE31 5K067 AA03 BB21 CC10 EE02 EE10 EE33

Claims (10)

[Claims] 1. A frequency hopping transmission / reception apparatus for generating a hopping pattern for sequentially specifying frequencies used for transmission and reception and for switching an oscillation frequency according to a control frequency value specified by the hopping pattern. Interference wave frequency storage means for storing a frequency value, and referring to a known interference frequency value stored in the interference wave frequency storage means, generate a hopping pattern that avoids the interference frequency, and set a control frequency according to this. And a hopping pattern generating means for generating a hopping pattern. 2. A transmission / reception apparatus for a frequency hopping communication system, which generates a hopping pattern for sequentially specifying frequencies to be used for transmission / reception and switches an oscillation frequency according to a control frequency value specified by the hopping pattern. Signal timing receiving means for receiving timing information to be received and determining a time timing at which the interference source is transmitting a signal; interference wave frequency storage means for storing an interference frequency value of the interference source; and receiving the interference signal timing. Referring to the output signal of the means and the output signal of the interference wave frequency storage means, generating a known interference frequency at which the interference signal is being transmitted, and a hopping pattern that avoids the time during which the interference source transmits the signal, and The hopping pattern can be regenerated with a period, and the control frequency can be And a hopping pattern generating means for generating a hopping pattern. 3. A transmission / reception apparatus for a frequency hopping communication system, which generates a hopping pattern for sequentially specifying frequencies to be used for transmission and reception and switches an oscillation frequency according to a control frequency value specified by the hopping pattern. Interference wave frequency storage means for storing a frequency value, and an interference signal for referring to an output signal of the interference wave frequency storage means, measuring a frequency of the interference source, and detecting a time timing when the interference source is transmitting a signal. A timing detection unit, referring to an output signal of the interference wave frequency storage unit, and inputting an output signal of the interference signal timing detection unit, and transmitting a known interference frequency at which the interference signal is being transmitted and an interference source Generate a hopping pattern that avoids time,
And a hopping pattern generating means for generating a control frequency at a transmission / reception timing according to the hopping pattern which can be regenerated at an arbitrary cycle. 4. A transmission / reception apparatus for a frequency hopping communication system, which generates a hopping pattern for sequentially specifying frequencies to be used for transmission / reception and switches an oscillation frequency according to a control frequency value specified by the hopping pattern. Interference wave frequency storage means for storing a frequency value, and interference signal timing detection means for measuring a frequency in a transmission band and detecting a time timing at which an interference source is transmitting a signal, the interference wave frequency storage means Refer to the output signal of, and input the output signal of the interference signal timing detection means, a known interference frequency at which the interference signal is being transmitted, and generate a hopping pattern that avoids the transmission time of the interference source,
And a hopping pattern generating means for generating a control frequency at a transmission / reception timing according to the hopping pattern which can be regenerated at an arbitrary cycle. 5. A transmission / reception apparatus for a frequency hopping communication system, which generates a hopping pattern for sequentially specifying frequencies to be used for transmission / reception and switches an oscillation frequency according to a control frequency value specified by the hopping pattern. Interference wave frequency storage means for storing a frequency value, interference with reference to the output signal of the interference wave frequency storage means, measuring the frequency of the interference source, and detecting the time timing when the interference source is transmitting the interference signal Signal timing detecting means, interference signal timing receiving means for receiving timing information transmitted from the interference source and determining the time timing at which the interference source is transmitting a signal, and reference to an output signal of the interference wave frequency storage means And inputting the output signal of the interference signal timing detection means and the output signal of the interference signal timing reception means. Generates a hopping pattern that avoids the known interference frequency at which the interference signal is being transmitted and the transmission time of the interference source, and enables the hopping pattern to be regenerated at any period, and controls the transmission and reception timing according to this And a hopping pattern generating means for generating a frequency. 6. A transmission / reception apparatus for a frequency hopping communication system, which generates a hopping pattern for sequentially specifying frequencies to be used for transmission and reception, and switches an oscillation frequency according to a control frequency value specified by the hopping pattern. Interference wave frequency storage means for storing a frequency value; interference signal timing detection means for measuring a frequency within a transmission bandwidth to detect a time timing at which an interference source is transmitting an interference signal; Signal timing receiving means for receiving the timing information, and determining the timing of the time when the interference source is transmitting the signal, referring to the output signal of the interference wave frequency storage means and outputting the output of the interference signal timing detecting means. The signal and the output signal of the interference signal timing receiving means are input, and a known signal from which the interference signal is transmitted is input. Frequency and a hopping pattern generating means for generating a hopping pattern avoiding the time of transmission by the interference source, and enabling re-generation of the hopping pattern at an arbitrary period, and generating a control frequency at transmission / reception timing in accordance with the hopping pattern. A transmission / reception device for a frequency hopping communication system, comprising: 7. A transmission / reception apparatus for a frequency hopping communication system, which generates a hopping pattern for sequentially specifying frequencies to be used for transmission and reception and switches an oscillation frequency according to a control frequency value specified by the hopping pattern. Interference wave frequency storage means for storing a frequency value, referring to the output signal of the interference wave frequency storage means, measure the frequency of the interference source and detect the time timing when the interference source is transmitting the interference signal One interference signal timing detecting means, a second interference signal timing detecting means for measuring a frequency within the communication bandwidth and separately detecting a time timing when the interference source is transmitting the interference signal, and an arbitrary pattern can be generated. With reference to the output signal of the interference wave frequency storage means, the output signal of the first interference signal timing detection means and the second The output signal of the interference signal timing detecting means is input, and a known hopping pattern which avoids a known interference frequency at which the interference signal is transmitted and the time of transmission by the interference source is generated, and the hopping pattern is reproduced at an arbitrary period. And a hopping pattern generation means for generating a control frequency at a transmission / reception timing according to the transmission / reception timing. 8. A transmission / reception apparatus for a frequency hopping communication system, which generates a hopping pattern for sequentially specifying frequencies to be used for transmission / reception and switches an oscillation frequency according to a control frequency value specified by the hopping pattern. An interference wave frequency storage unit storing a frequency value, and referring to an output signal of the interference wave frequency storage unit, measuring a frequency of the interference source and detecting a time timing at which the interference source is transmitting the interference signal. One interference signal timing detection means, a second interference signal timing detection means for measuring a frequency within the transmission bandwidth and separately detecting a time timing during which the interference source is transmitting the interference signal, and An interference signal timing receiving means for receiving timing information and determining a timing of a time when the interference source is transmitting a signal; Can be generated, referring to the output signal of the interference wave frequency storage means, the output signal of the first interference signal timing detection means, the output signal of the second interference signal timing detection means, Input the output signal of the signal timing receiving means, generate a known interference frequency at which the interference signal is being transmitted, and generate a hopping pattern that avoids the transmission time of the interference source, and regenerate the hopping pattern at an arbitrary cycle. And a hopping pattern generation means for generating a control frequency at a transmission / reception timing in accordance with the transmission / reception timing. 9. A transmission packet generating means for generating a transmission packet composed of modulated transmission data,
Inputting the output signal of the hopping pattern generation means,
The transmission is performed by defining a packet length so that an interference signal transmitted from an interference source and a transmission packet do not collide with each other, wherein transmission is performed. The transmission / reception device for a frequency hopping communication system according to any one of claims 6, 7, and 8. 10. A hopping pattern for uniformly hopping within a communication bandwidth if a known frequency interference does not exist when setting a hopping pattern designating a frequency and a time used for data transmission and reception. Set,
If there is known frequency interference and the transmission timing of the interference cannot be determined due to the transmission and reception of data that performs frequency switching according to the hopping pattern, a hopping pattern that avoids the known interference frequency is set. If there is known frequency interference and the transmission timing of the interference can be determined, the frequency and time mapping avoiding the interference frequency and time during which the interference is being transmitted is performed. Generate
A frequency hopping communication method in which a hopping pattern based on the hopping pattern is set, and at least one of transmission and reception of data in which frequency switching is performed under transmission / reception timing based on the hopping pattern is performed.