JP2009089203A - Radio apparatus, and radio communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that, when each of a plurality of radio apparatuses corrects its own frequency for receiving a transmission signal from an opposite side during communication, there is signal attenuation or the like caused by fading of the effect of an ambient environment and frequency detection can not be accurately performed, so that frequency correction can not be performed. <P>SOLUTION: A radio apparatus 100 of a frequency modulation scheme includes: a varying means 105 for varying transmission output, an automatic frequency control means 107 for performing frequency error correction in signal reception, and a control means 106 for controlling transmission/reception data. The varying means 105 is controlled in such a way that transmission output at a time when a receiving side transmits a specific portion to perform frequency correction thereon, becomes larger than transmission output at a time when the receiving side transmits any portion other than the specific portion, and communication quality is improved, thereby enhancing accuracy of frequency correction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wireless device and a wireless communication system that perform stable transmission and reception by correcting a change in frequency when transmitting and receiving in a wireless communication system.

  Conventional wireless devices and wireless communication systems include wireless network systems that can autonomously set the operating frequencies of a plurality of wireless devices to a substantially constant operating frequency.

  For example, the operating frequency in a plurality of wireless devices (or a plurality of electrical devices) is autonomously set to a substantially constant operating frequency, and the plurality of wireless devices (or a plurality of electrical devices) are autonomously and immediately. An object of providing a wireless network system constituting a network is a network system configuration as shown in FIG. 5, and a configuration of a wireless device in the network system is shown in FIG. For example, Patent Document 1).

  5 and 6, the wireless network system 100 includes wireless devices 10, 30, 40, and 50. The radio device 10 includes an antenna 110, a high frequency amplifier 120, a tuning demodulation circuit 130, reference frequency oscillators 140 and 190, a mixer 150, a low-pass filter 160, a frequency counter 170, a controller 180, The frequency corrector 200 and a transmission processing circuit 210 are included.

  The tuning demodulation circuit 130 includes a mixer 131, a low-pass filter 132, a demodulator 133, and a voltage control local oscillation circuit 134.

  The operation will be described below.

  The wireless device 10 transmits / receives data to / from the wireless device 30, corrects its own frequency f01 to an intermediate frequency f1 between its own frequency f01 and the frequency f02 of the wireless device 30, and the wireless device 30 The own frequency f02 is corrected to an intermediate frequency f1 between f02 and the frequency f01 of the wireless device 10. Two wireless devices arbitrarily selected from wireless devices 10, 30, 40, and 50 transmit and receive data to and from the other party of communication, and similarly correct their own frequencies sequentially based on the other party's frequency. To do.

By this method, the operating frequency of the wireless devices 10, 30, 40, 50 in the wireless network system 100 is finally set to a constant operating frequency. Thus, the wireless devices 10, 30, 40, and 50 can transmit and receive data to and from each other at the same operating frequency.
JP 2006-238091 A

  However, in the above-described wireless communication device, when performing wireless communication, the frequency to be transmitted and received is shifted from the original frequency due to the environment in which each wireless device is installed and the parts (crystal) used. The quality of wireless communication can be improved by detecting and correcting the frequency by receiving the transmission data of the other party, but in real environments, the amplitude due to fading phenomenon in the environment There is a problem that erroneous detection of frequency occurs due to a change, phase change, and reception level decrease.

  Also, in a real environment when the received signal is less than the signal level for frequency detection, it is necessary to perform frequency correction multiple times, which increases communication time and consequently power consumption. There are also issues such as an increase.

  The present invention solves the above-described conventional problem, and on the assumption that a frequency shift occurs, each time a transmitting side transmits a data portion in which a receiving side wireless device performs automatic frequency correction from a received signal. An object of the present invention is to perform stable communication by amplifying and varying the transmission power only in the data portion and accurately performing frequency detection with stable transmission power.

  In order to solve the above-mentioned problems, in the present invention, a frequency modulation / demodulation radio apparatus, a variable means for changing a transmission output, a frequency automatic control (AFC) means for performing frequency error correction at the time of signal reception, and a transmission / reception And a control means for controlling data.

  Thus, by controlling the variable means so that the transmission output when transmitting a specific part of transmission data is larger than the transmission output when transmitting a part other than the specific part, the maximum transmission output can be specified. In part, the radio device on the receiving side can reliably detect the frequency.

  As described above, according to the present invention, there is an influence in the real environment by using the variable means for making the transmission output of the wireless device variable and maximizing the transmission output for only a specific part of the transmission data by the control means. Even in such a case, the frequency detection and frequency correction of the automatic frequency control means (AFC) of the receiving-side radio apparatus can be reliably performed with the data of the specific portion transmitted at the maximum output, and the communication performance can be improved. .

  A first aspect of the present invention is a frequency modulation / demodulation radio apparatus, a variable means for changing a transmission output, a frequency automatic control (AFC) means for correcting a frequency error when receiving a signal, and a control means for controlling transmission / reception data. By providing the control means, the control means controls the variable means so that a transmission output when transmitting a specific part of transmission data is larger than a transmission output when transmitting a part other than the specific part. To do.

  As a result, the frequency automatic control means of the radio apparatus that receives the data corrects the frequency with the data of the specific part transmitted with the increased transmission output, and the erroneous detection of the frequency due to the influence of the surrounding environment. Incorrect correction can be prevented, and the power consumption can be minimized by controlling the transmission output of a specific portion of transmission data to be larger than the transmission output of a portion other than the specific portion.

  In a second aspect of the invention, in particular, in the first aspect of the invention, the control means uses the specific portion of the transmission data that makes the transmission output of the variable means larger than the transmission output other than the specific portion as a bit synchronization signal. Of the bit sync signal, frame sync signal, and data signal, the bit sync signal that detects the frequency most stably and evenly for center frequency detection is transmitted with a larger output than the other data parts, and the frame sync signal is transmitted. The data signal is transmitted with low power consumption transmission power.

  Thereby, the center frequency is accurately detected by the bit synchronization signal whose output is larger than that of the other part, and the frequency is corrected by the frequency automatic control means, thereby improving the reception accuracy of the subsequent frame synchronization signal and data signal. It is possible to minimize the power consumption by increasing the transmission output of only the bit synchronization signal.

  A third invention is a frequency modulation / demodulation type synchronous radio communication system that receives a transmission signal on the transmission side and performs frequency automatic control (AFC) correction on the reception side, a synchronization correction unit that corrects communication timing, and a transmission output Variable means, frequency automatic control (AFC) means for performing frequency error correction at the time of signal reception, and control means for controlling transmission / reception data, so that the control means transmits only during synchronization correction communication. The output is performed by the variable means with a stronger output than when the synchronization correction is performed.

  This makes it possible to minimize power consumption due to output transmission with increased transmission output by performing frequency correction only when performing time synchronization among multiple times of communication, and perform frequency correction with high accuracy. be able to.

  A fourth aspect of the invention is a frequency modulation / demodulation type synchronous radio communication system that receives a transmission signal on the transmission side and performs frequency automatic control (AFC) correction on the reception side, and a synchronization correction unit that corrects communication timing, and a transmission output Variable communication means, frequency automatic control (AFC) means for correcting frequency error at the time of signal reception, control means for controlling transmission / reception data, and determination means for determining whether communication is correct or not. When transmission becomes an error due to the influence, transmission with gradually increasing output is performed for each communication.

  As a result, transmission power can be performed at an optimum output according to communication performance, power consumption can be minimized, and frequency correction can be performed according to whether communication is correct or not. And false positives can be minimized. In addition, communication quality as a wireless system can be improved.

  In the fifth invention, in particular, in the third invention, the control means on the receiving side increases the transmission output of the synchronization correction response transmission stepwise by the variable means in the order of initial transmission response, retransmission response, and re-transmission response. Thus, by varying the transmission output on the transmission side and the reception side in stages, the communication quality can be stabilized and the power consumption of transmission can be suppressed.

  In a sixth aspect of the invention, in particular, in the third or fourth aspect of the invention, the reception side is synchronized by setting the transmission output of the variable means to the maximum output only in a specific part of the transmission data of the communication for which the synchronization correction means performs synchronization correction. The frequency is corrected by the frequency automatic control means only during correction communication.

  As a result, the power consumption of transmission with the maximum output can be further reduced to a part of the data only by specific synchronous communication, so that the power consumption can be further minimized and the frequency can be detected and corrected accurately. Can do.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a configuration diagram of a radio apparatus according to Embodiment 1 of the present invention.

  In FIG. 1, this example includes an antenna 101 for transmitting / receiving a signal to / from the radio apparatus 100-1, an antenna control unit 102 for switching between transmission and reception, a transmission unit 103 as a transmission filter circuit, and a reception filter unit. A receiving unit 104; a variable unit 105 that varies a transmission output; a frequency automatic control unit 107 that detects a frequency from a signal received by the receiving unit 104 and automatically corrects the frequency; and a transmission / reception signal output and a frequency control The basic configuration is composed of the control means 106 that performs the above control.

  FIG. 2 shows a format content 202 of data generated at the time of transmission by the control means 106 of the wireless device 100-1. An output waveform 201 indicating a transmission output at the time of transmission is shown, and a maximum output level AA and a low consumption output level BB transmitted to the maximum output by the variable means 105 only for a specific data portion are shown. In this case, an example in which the specific data portion is a bit synchronization signal portion is shown, but the same applies to other portions.

  Next, the operation and action of the wireless device 100-1 having such a configuration will be described.

  First, the wireless device 100-1 receives a signal from another wireless device via the antenna 101. Usually, since there is a frequency error of about ± 4 ppm for each wireless device, a reception signal is input to the control means 106 by switching the antenna control unit 102 to the reception unit 104 at the time of reception, and the frequency is determined from the input signal. The automatic control means 107 detects the frequency, and corrects and adjusts the reception frequency of the wireless device 100-1 itself to that frequency.

  Next, when the wireless device 100-1 transmits, the control means 106 adjusts the output of only the specific data portion (bit synchronization signal) of the transmission signal to the maximum output AA (1.2 mW) by the variable means 105, and other than the specific data portion The data of the (frame synchronization signal and data signal) is adjusted by the variable means 105 to the low power consumption output BB (0.85 mW) used during normal communication, and is transmitted from the antenna 101 via the antenna control unit 102 from the transmission unit 103. Sent. By transmitting only the specific data portion with the maximum output by the variable means 105, the reception frequency can be corrected and adjusted with a high and stable signal level by the automatic frequency control means 107 of the other receiving radio apparatus.

  Here, the maximum output AA is 1.2 mW and the low power consumption BB is 0.85 mW. This is an example of the maximum output according to the technical standard of 1 mW output of the specific low power radio, but the reference value and the maximum As long as the output and the low power consumption are determined within a range that conforms to the technical standards of the radio equipment to be used, the values can be set arbitrarily.

  As described above, in the present embodiment, the control unit includes the variable unit that varies the transmission output, the frequency automatic control unit that performs frequency error correction at the time of signal reception, and the control unit that controls transmission / reception data. When the means 106 performs transmission, only the specific data portion (bit synchronization signal) is changed by the variable means 105, and the transmission output is set to the maximum output AA, so that the automatic frequency control means 107 of the receiving side radio apparatus can stably detect the frequency. And corrections can be made.

  Since the bit sync signal transmits both 1 and 0 of the data uniformly, stable frequency detection can be performed. By transmitting at the maximum output, there is an influence of signal attenuation due to fading due to the environment. However, it is possible to facilitate reception and secure stable communication quality. Furthermore, the current consumption at the time of transmission can be suppressed by setting only the specific data portion to the maximum output.

  Here, all the bit synchronization signals are specified data, but the maximum output time is further suppressed by specifying the number of bits for the signal detection time + the number of bits necessary for frequency detection as the specific data. The same applies to consumption.

(Embodiment 2)
FIG. 3 shows a configuration diagram of a radio communication system according to the second embodiment of the present invention.

  In FIG. 3, there are a plurality of wireless devices 100-2 and 100-3, the wireless device 100-2 transmits a synchronization signal for performing synchronous communication with the wireless device 100-3, and synchronization correction is performed by the wireless device. 100-3 is a configuration of a wireless communication system performed by 100-3.

  In addition, the wireless device 100-2 and the wireless device 100-3 include synchronization correction units 108-2 and 108-3 for performing synchronous communication. Since other configurations are the same as those of radio apparatus 100-1 of the first embodiment, description thereof is omitted.

  Next, FIG. 4A shows the case where the transmission side is the wireless device 100-2 and the reception side is the wireless device 100-3, and there are transmissions 301-1 and 301-2 of synchronization correction communication for matching the communication timing. The interval is 32 s, and after the synchronization correction communication, periodic communication 302-1 to 302-7 is performed at regular intervals according to the synchronization timing.

  Next, in response to the transmission, the receiving side radio apparatus 100-3 has reception waits 303-1 and 303-2 for synchronization correction communication, and response transmissions 305-1 and 305-2 for the synchronization correction communication, Assume that waiting for receiving regular communication at regular intervals is 304-1 to 304-7.

  FIG. 4B shows the details of the synchronous communication portion of FIG. 4A. When the radio apparatuses 100-2 and 100-3 receive a reception failure during synchronous communication, The configuration of synchronous communication 301-1, 2 for performing synchronous transmission, retransmission, and re-transmission, synchronous communication reception waiting 303-1, and response transmission 305-1 and 30-2 is shown.

  Next, the operation and action of the radio transmission apparatus having such a configuration will be described.

  Each of the radio apparatuses 100-2 and 100-3 holds a reference value of a frequency at which it transmits / receives itself, and the reference value has a tolerance within a range of ± 4 ppm with respect to the original frequency.

  Each of the wireless devices 100-2 and 100-3 corrects its reception frequency only when receiving a synchronization correction signal from a communication partner. The synchronization correction is a communication periodically performed by the synchronization correction units 108-2 and 108-3 in order to adjust the respective communication timings. The communication other than the periodic synchronization correction communication is performed by the synchronization correction communication. Continue communication at the timing.

  This synchronization correction is transmitted to the variable unit 105-2 with the maximum output AA (1.2 mW) when the radio apparatus 100-2 transmits a synchronization signal from the synchronization correction unit 108-2 to the control unit 106-2. Control to do. Next, when the radio apparatus 100-3 receives the signal transmitted at the maximum output, the frequency automatic control means 107-3 detects the frequency and corrects the frequency. At the same time, the synchronization correction means 108-3 corrects the communication timing.

  During the synchronization correction communication, the wireless device 100-3 performs response communication. At this time, the control unit 106-3 of the wireless communication device 100-3 outputs the maximum output AA (1.2 mW) to the variable unit 105-3. Control to send. When the radio apparatus 100-2 receives this maximum output transmission, the frequency automatic control means 107-2 detects the frequency and corrects the frequency.

  Next, the wireless device 100-3 performs reception at a frequency corrected by the previous synchronization correction communication for communication during which periodic synchronization correction communication is not performed. Similarly, the wireless device 100-2 receives a communication other than the synchronization correction communication with the frequency correction value when the synchronization correction response is received.

As for the detailed operation of the synchronous communication, as shown in FIG. 4B, the wireless device 100-2 performs the initial transmission transmission of the synchronous communication with the variable means 105-2 at the low power consumption output BB (0.85 mW). The receiving side wireless device 100-3 does not receive and does not respond, the wireless device 100-2 performs retransmission and the variable means 105-2 performs standard transmission CC (1.0 mW), and the receiving side wireless device 10
0-3 is not received and no response is made, and the variable unit 105-2 performs the re-transmission transmission of the radio apparatus 100-2 with the maximum output AA (1.2 mW).

  The receiving-side radio apparatus 100-3 receives the last re-transmission maximum output AA, and transmits a response with the maximum output AA. Here, an example has been shown in which the wireless device 100-3 on the receiving side responds with the output AA at the time of re-transmission, but when it responds at the time of retransmission, it transmits with the same output as the output CC on the transmitting side, Alternatively, transmission may be performed with the same output BB as that on the transmission side. The initial transmission and retransmission may be output BB, and only the re-transmission output may be output AA.

  Since other operations and functions are the same as those in the first embodiment, the description thereof will be omitted.

  As described above, in the present embodiment, the automatic frequency control means 107-2 and 107-3 receive the other party at the time of reception only at the time of communication in which the synchronization correction means 108-2 and 108-3 perform synchronization timing at regular intervals. By correcting the own frequency to the transmission frequency and setting the transmission output at that time to the maximum output AA, the frequency can be detected stably and the accuracy of the frequency correction can be improved. Further, since frequency correction is not performed except for the subsequent periodic synchronization correction communication, it is not necessary to maximize the transmission output, and low power consumption can be achieved.

  Further, only the specific data portion of the synchronization correction communication is set to the maximum output by the variable means 105-2 and 105-3, so that the power consumption can be further reduced.

  In addition, when normal communication is possible at the timing of synchronous communication, the variable means 105-2 and 105-3 are transmitted with low power consumption, and when communication is impossible, retransmission, re-transmission and gradually transmission output are performed. By performing communication by increasing the variable means 105-2 and 105-3, it is possible to further improve communication performance and quality and reduce power consumption.

  Here, the interval at the time of synchronous communication is 32 s. However, if the frequency changes frequently due to the installation environment of the wireless devices 100-2 and 100-3, the same is true even if the interval is shortened.

  Further, in this wireless communication system, two units of communication have been described, but even when two or more wireless devices are used, when the receiving side corrects its own frequency in communication between the transmitting side and the receiving side, the transmitting side specifies specific data. It is the same that the transmission output is varied only during the partial and synchronization correction communication.

  Note that the means described in this embodiment causes hardware resources such as a CPU (or microcomputer), a RAM, a ROM, a storage / recording device, an electrical / information device including an I / O, a computer, a server, and the like to cooperate. You may implement with the form of a program. In the form of a program, new functions can be easily distributed / updated and installed by recording them on a recording medium such as magnetic media or optical media or distributing them via a communication line such as the Internet.

  As described above, according to the present invention, when performing wireless communication, the frequency to be transmitted and received is deviated from the original frequency depending on the environment in which each wireless device is installed or the component (crystal) used. In some cases, it is possible to improve the quality of wireless communication by detecting and correcting the frequency when transmitting and receiving the deviation, but it cannot be corrected because the signal for frequency detection cannot be received accurately due to fading, etc. Even in such a case, the frequency correction can be performed accurately and stably by maximizing the transmission output of only the data of the frequency detection portion by the variable means.

  Also, in communications such as communication devices and mobile phones, it is not always necessary to communicate at the maximum output, it can be reduced power consumption by maximizing only at the time of frequency correction, communication devices using batteries, etc. It can be used not only for easy use, but also for security equipment, buildings, factories, and other industrial applications such as buildings and factories that require small mobile phones.

Configuration diagram of radio apparatus according to Embodiment 1 of the present invention The figure which shows the transmission data format and output of the radio | wireless apparatus of Embodiment 1 of this invention. Configuration diagram of a wireless communication system according to a second embodiment of the present invention (A) Synchronous transmission / reception timing diagram of the wireless communication system according to the second embodiment of the present invention (b) Synchronous transmission / reception timing diagram of the wireless transmission system according to the second embodiment of the present invention Configuration diagram of a conventional wireless communication system Configuration diagram of conventional radio equipment

Explanation of symbols

10, 30, 40, 50 Wireless device 100 Wireless network 100-1, 100-2, 100-3 Wireless device 101 Antenna 102 Antenna control unit 103 Transmitting unit 104 Receiving unit 105, 105-2, 105-3 Variable means 106 Control Means 107 Automatic frequency control means 108-2, 108-3 Synchronization correction means 110 Antenna 120 High frequency amplifier 130 Tuning demodulation circuit 131 Mixer 132, 160 Low pass filter 133 Demodulator 134 Voltage control station oscillation circuit 140, 190 Reference frequency oscillator DESCRIPTION OF SYMBOLS 150 Mixer 170 Frequency counter 180 Controller 200 Frequency corrector 201 Transmission data content 202 Transmission data output waveform 210 Transmission processing circuit 301-1 and 301-2 Transmission side synchronous correction signal 302-1 to 302-7 Transmission side regular communication signal 303-1, 303-2 Reception side synchronization correction reception waiting 304-1 to 304-7 Reception side periodic communication reception waiting 305-1, 305-2 Reception side synchronization correction response AA Maximum output level (1.2 mW)
BB Low power consumption level (normal state: 0.85 mW)
CC normal output level (1.2mW)

Claims (6)

A frequency modulation / demodulation wireless device,
Variable means for changing the transmission output, frequency automatic control (AFC) means for performing frequency error correction at the time of signal reception, and control means for controlling transmission / reception data,
The wireless device that controls the variable means so that a transmission output when transmitting a specific part of transmission data is larger than a transmission output when transmitting a part other than the specific part. The radio apparatus according to claim 1, wherein the specific part of the transmission data is a bit synchronization signal. A frequency modulation / demodulation synchronous radio communication system in which a transmission signal on a transmission side is received and automatic frequency control (AFC) correction is performed on a reception side,
Synchronization correction means for correcting the communication timing, variable means for changing the transmission output, frequency automatic control (AFC) means for performing frequency error correction at the time of signal reception, and control means for controlling transmission / reception data,
The synchronization correction means on the transmission side makes the transmission output of the variable means stronger than when performing synchronization correction only during communication for performing synchronization correction, and the frequency is automatically controlled by the frequency automatic control means only during communication for synchronization correction on the reception side. A wireless communication system to be corrected. A frequency modulation / demodulation synchronous radio communication system in which a transmission signal on a transmission side is received and automatic frequency control (AFC) correction is performed on a reception side,
Synchronization correction means for correcting communication timing, variable means for changing transmission output, frequency automatic control (AFC) means for performing frequency error correction at the time of signal reception, control means for controlling transmission / reception data, and determination of communication correctness Judgment means to perform,
When the determination means on the reception side determines NO and the transmission side performs retransmission and re-transmission, the transmission output is increased stepwise by the variable means in the order of initial transmission, retransmission, and re-transmission, and the reception side performs synchronization correction. A wireless communication system in which the frequency automatic control means corrects the frequency only when the determination means of the initial transmission, retransmission, and re-transmission is positive. 5. The wireless communication system according to claim 4, wherein the control means on the receiving side increases the transmission output of the synchronization correction response transmission stepwise by the variable means in the order of initial transmission response, retransmission response, and re-transmission response. 4. The frequency output is corrected by the automatic frequency control means only at the time of communication for synchronization correction on the receiving side only when the transmission output of the variable means is set to a maximum output only for a specific part of transmission data of communication for which the synchronization correction means performs synchronization correction. Or the radio | wireless communications system in any one of 4.

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