JP5435863B2 - Wireless terminal device - Google Patents

Description

  The present invention relates to a wireless terminal device and a gain adjustment method, and more particularly to a wireless terminal device and a gain adjustment method for adjusting a gain in wireless distance measurement.

  A device that measures the distance to a target by measuring the time from transmission of ultrasonic waves to reception of reflected waves is known as a method for measuring the distance to the target. Yes. In this type of conventional measuring apparatus, a method of measuring both short distance and long distance by adjusting the reception threshold according to the attenuation of the received signal with distance is disclosed. In this method, an adjustment is made to increase the sensitivity of the reception detection level as the time from transmission to reception is longer based on the level attenuation curve based on the distance on the assumption of ultrasonic reflection (for example, patents). Reference 1).

JP 2004-45188 A

  The gain adjustment (threshold adjustment) method in the above-described conventional apparatus performs adjustment to reduce the reception threshold based on a level attenuation curve when ultrasonic waves propagate in the air. This method is premised on the reflection of ultrasonic waves, and it is necessary that the processing time at the reflection point (between forward reception and return transmission) is zero.

  However, considering the case of wireless communication, in the case of wireless communication, a process is performed in which a communication frame on the forward path is received and interpreted by the partner terminal, and a return frame is assembled and transmitted. Since this communication processing time is not zero and varies from communication to communication, it cannot be adjusted using a level attenuation curve when radio waves propagate in the air. Therefore, there is a problem that the conventional gain adjustment method cannot be applied to wireless communication.

  The present invention has been made to solve such a problem, and by adjusting the signal level of the transmission / reception signal to match, it is possible to prevent an error due to a signal level difference and improve the accuracy of distance measurement. An object is to obtain a wireless communication apparatus and a gain adjustment method that are possible.

According to the present invention, a wireless communication unit that transmits and receives a signal in wireless communication, an amplification unit that amplifies a signal level of a transmission / reception signal by the wireless communication unit, and the transmission / reception signal amplified by the amplification unit are input, A detection means for detecting a signal having a signal level larger than a predetermined detection threshold value set in advance as a transmission signal or a reception signal, and a radio wave based on a round-trip time of a wireless communication signal based on a detection result by the detection means. A measurement unit including a distance detection unit that measures a propagation delay time to obtain a distance from the counterpart wireless terminal device, and a gain adjustment unit that performs gain adjustment of the amplification unit; the signal level of the received the received signal is measured, make decisions gain adjustment value in accordance with the radio wave attenuation during communication for each received signal The gain adjustment based on the gain adjustment value, the signal level of the transmission signal transmitted to the destination radio terminal apparatus by the wireless communication means, by the wireless communication means from the destination wireless terminal device corresponding to the transmission signal by combining a signal level of a reception signal received, by preventing the degradation of measurement accuracy due to electrostatic wave attenuation, a wireless terminal device, characterized in that the measurement of the round trip time.

According to the present invention, a wireless communication unit that transmits and receives a signal in wireless communication, an amplification unit that amplifies a signal level of a transmission / reception signal by the wireless communication unit, and the transmission / reception signal amplified by the amplification unit are input, A detection means for detecting a signal having a signal level larger than a predetermined detection threshold value set in advance as a transmission signal or a reception signal, and a radio wave based on a round-trip time of a wireless communication signal based on a detection result by the detection means. A measurement unit including a distance detection unit that measures a propagation delay time to obtain a distance from the counterpart wireless terminal device, and a gain adjustment unit that performs gain adjustment of the amplification unit; the signal level of the received the received signal is measured, make decisions gain adjustment value in accordance with the radio wave attenuation during communication for each received signal The gain adjustment based on the gain adjustment value, the signal level of the transmission signal transmitted to the destination radio terminal apparatus by the wireless communication means, by the wireless communication means from the destination wireless terminal device corresponding to the transmission signal by combining a signal level of a reception signal received, by preventing the degradation of measurement accuracy due to electrostatic wave attenuation, since it is the radio terminal apparatus characterized by the measurement of the round trip time, signal transmission and reception signal By adjusting the level to match, it is possible to prevent the occurrence of errors due to signal level differences and improve the accuracy of distance measurement.

Embodiment 1 FIG.
FIG. 1 is a diagram illustrating a configuration of a wireless communication apparatus according to a first embodiment of the present invention, and illustrates a distance measurement method using wireless communication. As shown in FIG. 1, the wireless communication apparatus according to the present embodiment includes a wireless apparatus 1 (reference numeral 11) and a wireless apparatus 2 (reference numeral 12), which are wireless terminal apparatuses having a wireless communication function. The wireless device 1 has an antenna 2 and transmits a transmission frame 1 (reference numeral 30), which is a transmission signal, to the wireless device 2. The wireless device 2 receives the transmitted transmission frame 1 as a reception frame 1 (reference numeral 31) as a reception signal by the antenna 2. Next, the wireless device 2 transmits a transmission frame 2 (reference numeral 32), which is a transmission signal, to the wireless device 1. The wireless device 1 receives the transmission frame 2 as a reception frame 2 (reference numeral 33) that is a reception signal.

  The wireless communication device according to the present embodiment measures the radio wave propagation delay time Td from the round-trip time of wireless communication between the wireless device 1 and the wireless device 2, converts it to a distance, and converts the wireless devices 1 and 2 into distances. Find the distance between.

  The wireless device 1 measures the time from the end of transmission of the transmission frame 1 to the end of reception of the reception frame 2 and sets it as a delay time A. The wireless device 2 measures the time from the end of reception of the reception frame 1 to the end of transmission of the transmission frame 2 and sets it as a delay time B. The relationship of the following formula (1) is established between the time Td required for radio waves to propagate between the wireless devices 1 and 2 and the delay times A and B.

Delay time A = delay time B + Td × 2 (1)
Td = (delay time A−delay time B) / 2

  The radio wave propagation delay time Td is obtained from the above equation (1), and the radio wave propagation delay time Td is converted into a distance from the radio wave propagation time per unit time (300,000 km / 1 second). The distance can be determined.

  FIG. 2 is a diagram showing the occurrence of errors due to the attenuation of received radio waves in the distance measurement method described above. In FIG. 2, expected values A and B indicate delay time A and delay time B to be measured. Measurement results A and B indicate delay time A and delay time B that are actually measured.

  Detection thresholds (reference numerals 40 and 41) are set in advance in ADCs (A / D converters) (see FIG. 4) provided in the wireless devices 1 and 2 for detecting signals, and the amplitude of the input signal When the level is larger than the detection threshold, the signal change is converted into a digital signal and output. Therefore, detection of the end of communication (that is, detection of the transmission end time of the transmission signal or the reception end time of the reception signal) is determined by setting a point (time point) at which the signal amplitude becomes small and no longer falls within the detection threshold range Detect. The detection threshold 40 or 41 has an upper limit threshold and a lower limit threshold, and indicates a range between them. Here, the detection threshold values 40 and 41 are in the same range.

  In general, when radio waves propagate in the air, the signal intensity is attenuated. Therefore, as shown in FIG. 2, a difference occurs between the amplitude levels of the transmission signal and the reception signal of the wireless device.

  When the frequency band of the transmission / reception circuit is narrow, high-frequency components (steep signal changes) are removed, and the end of the signal has a gentle attenuation characteristic. If there is a difference between the amplitude levels of the transmission signal and the reception signal, the signal end detection position (the point at which the signal amplitude ceases to fall out of the detection threshold range) is shifted between transmission and reception. Appears as an error in the measurement results. In the case of FIG. 2, the measurement result A is shorter than the expected value A by “ΔTa2−ΔTa1”. Further, the measurement result B is longer than the expected value B by “ΔTb1−ΔTb2”. Here, ΔTa1 is a time difference between the end detection point of the transmission signal 1 and the actual transmission end point. ΔTa2 is the time difference between the end detection point of the reception signal 2 and the actual reception end point. Similarly, ΔTb1 is the time difference between the end detection point of the received signal 1 and the actual reception end point, and ΔTa2 is the time difference between the end detection point of the transmission signal 2 and the actual transmission end point. It is. Thus, “expected value A−expected value B” includes “measurement result A−measurement result B”, and the correct radio wave propagation time Td cannot be obtained. Therefore, in the present embodiment, this error is reduced by the following method.

  FIG. 3 is a diagram showing an error reduction method in the present embodiment. In the present embodiment, each of the wireless devices 1 and 2 is provided with a gain adjustment function for amplifying the amplitude level of the received signal, and only the amplitude level of the received signal is amplified to measure the transmission signal during the delay time measurement. The occurrence of an error is prevented by matching the amplitude level of the received signal with the amplitude level of the received signal. Due to the function of the gain adjustment function, the signal level difference between the transmission signal and the reception signal is eliminated in this way, so that the signal end detection position (the point at which the signal amplitude is no longer outside the detection threshold range) can be transmitted and received. They coincide, and ΔTa1 ′ = ΔTa2 ′ and ΔTb1 ′ = ΔTb2 ′. As a result, ΔTa1′−ΔTa2 ′ = 0 and ΔTb1−ΔTb2 = 0, so that an error caused by a signal level difference can be prevented and the measurement accuracy of the radio wave propagation time Td can be improved. Here, ΔTa1 ′ is the time difference between the end detection point of transmission signal 1 and the actual transmission end point. ΔTa 2 ′ is a time difference between the end detection point of the reception signal 2 and the actual reception end point. Similarly, ΔTb1 ′ is a time difference between the end detection point of the received signal 1 and the actual reception end point, and ΔTa2 ′ is the end detection point of the transmission signal 2 and the actual transmission end point. Is the time difference.

  As described above, in the present embodiment, the radio apparatus is composed of a plurality of radio apparatuses for performing transmission and reception, and the radio wave propagation delay time is measured from the round-trip time of radio communication between the transmission side and the reception side. A wireless communication device that detects the distance between signals, has a gain adjustment function that can set the signal level of transmission and reception, and matches the signal level of the transmission signal and the signal level of the reception signal when measuring the round-trip time Therefore, the measurement accuracy is not lowered due to radio wave attenuation, and the radio wave propagation time can be measured with high accuracy.

Embodiment 2. FIG.
FIG. 4 is a block diagram showing a hardware configuration of the wireless devices 1 and 2 according to the present invention. As illustrated in FIG. 4, the wireless devices 1 and 2 each transmit and receive a wireless communication unit 1 that transmits and receives transmission / reception frames (transmission signals and reception signals) in wireless communication, an antenna 2 that transmits and receives wireless signals, and transmission and reception. A signal amplification / filter unit 3 that removes noise from the signal and amplifies the signal to a level that can be detected by the ADC 4. A signal having a signal level larger than the detection threshold among the amplified transmission / reception signals is "1", and the others are " ADC (Analog / Digital Converter) 4 that converts and outputs a digital signal of 0 ″, and measurement control and time for performing transmission / reception frame end detection, time measurement, and gain adjustment control based on the output from the ADC 4 The measuring unit 5 includes a signal distributor 6 that distributes a communication signal (transmission / reception signal) between the wireless communication unit 1 and the antenna 2 to the signal amplification / filter unit 3. The signal amplification / filter unit 3 includes two amplifiers / filters 3a and 3b for removing noise and a variable amplifier provided between the amplifiers / filters 3a and 3b. Note that the number of amplifiers / filters may be increased or decreased according to the specifications (transmission power) of the wireless communication unit.

  Further, the measurement control / time measuring unit 5 has a delay time A from the end of transmission of the transmission signal by the wireless communication unit 1 to the end of reception of the received signal from the counterpart wireless terminal device transmitted to the transmission signal, or Delay time measurement function for measuring a delay time B from the end of reception of a received signal transmitted from the counterpart wireless terminal apparatus by the wireless communication unit 1 to the end of transmission of a transmission signal transmitted to the counterpart radio terminal apparatus with respect to the received signal And a propagation time calculation function for calculating the radio wave propagation delay time Td to the counterpart wireless terminal device based on the measured delay time by the above equation (1), and the radio wave propagation time per unit time (300,000 km / 1 Second), the calculated radio wave propagation delay time Td is converted into a distance, and the distance calculation function for obtaining the distance to the counterpart wireless terminal device and the signal levels of the transmission signal and the reception signal are And a gain adjusting function of outputting the gain adjustment setting value to integer to the signal amplifying filter section 3. Note that these functions provided in the measurement control / time measurement unit 5 are constituted by a single circuit.

  FIG. 5 is a diagram for explaining the gain adjustment processing method of the received signal in the present embodiment. In FIG. 5, the process in the radio | wireless apparatus 1 in FIG. 1 is demonstrated. The transmission frame 1 (reference numeral 30) is composed of a preamble 30a, a start flag 30b, and a payload 30c. Similarly, the received frame 2 (reference numeral 33) is composed of a preamble 33a, a start flag 33b, and a payload 33c.

  The wireless communication unit 1 detects the start flag 30b of the transmission frame 1 (symbol 30) and notifies the measurement control / time measurement unit 5 of it. Upon receiving the notification, the measurement control / time measurement unit 5 detects the end of the transmission signal based on the output from the ADC 4. In the end detection, the set value of gain adjustment is set to 0, and signal amplification by the variable amplifier 3b is not performed. In the end detection, the measurement control / time measurement unit 5 proceeds to the transmission signal end detection phase and monitors the output change of the ADC 4. The measurement control / time measurement unit 5 regards the time when the output of the ADC 4 is no longer changed (the time when the output of the ADC 4 does not change from 0) as the end of the transmission signal.

Next, the wireless communication unit 1 detects the start flag 33b of the received frame 2 (reference numeral 33) and notifies the measurement control / time measurement unit 5 of the start flag 33b. Upon receiving the notification, the measurement control / time measurement unit 5 proceeds to the gain adjustment phase and starts setting the variable amplifier 3b. That is, the gain setting value of the variable amplifier 3b is increased by one step to check whether a change appears in the output of the ADC 4. The gain setting value (+ N) at which the output of the ADC 4 has changed is determined as reception level detection. The offset value α is added to the gain setting value, and the ADC input signal is increased by A _α which is a level difference between the signal level of the ADC detection threshold and the signal level of the transmission signal. As a result, as shown in FIG. 5, the signal level of the reception signal becomes approximately the same as the signal level of the transmission signal.

  After the gain setting of the variable amplifier 3b is completed, the measurement control / time measuring unit 5 proceeds to the reception signal end detection phase, monitors the output change of the ADC 4, and ends the reception signal when the change in the output of the ADC 4 disappears. It is considered.

  FIG. 6 is a diagram showing processing in the wireless device 2 in FIG. As shown in FIG. 6, the received frame 1 (reference numeral 31) includes a preamble 31a, a start flag 31b, and a payload 31c. The transmission frame 2 (reference numeral 32) is composed of a preamble 32a, a start flag 32b, and a payload 32c. The wireless device 1 measures the time from the end of the transmission signal to the end of the reception signal, while the wireless device 2 measures the time from the end of the reception signal to the end of the transmission signal. Therefore, contrary to the case of the wireless device 1, the end of the transmission signal is detected after the gain adjustment of the reception signal and the end of the reception signal are detected. Since other operations are the same as those of the wireless device 1, the description thereof is omitted here.

  As described above, according to the present embodiment, the same effects as those of the above-described first embodiment can be obtained, and further, gain adjustment and transmission / reception frame end detection (time measurement) can be performed on the same hardware configuration. Can be realized. Therefore, there is an advantage that the necessary hardware scale can be reduced.

Embodiment 3 FIG.
In the above-described second embodiment, the example in which the variable amplifier 3b is used as the gain adjuster has been described. However, the present invention is not limited thereto, and for example, a variable attenuator may be used as another example. FIG. 7 is a block diagram showing a hardware configuration in the present embodiment when a variable attenuator is used. 7 is different from FIG. 4 in that the variable amplifier 3b in FIG. 4 is changed to the variable attenuator 3e, and the variable attenuator 3e is set by the measurement control / time measuring unit 5. The amplifier / filters 3d and 3f in FIG. 7 are equivalent to the amplifier / filters 3a and 3c in FIG. Further, in the present embodiment, the code of the signal amplification / filter unit is 3A in order to distinguish it from FIG. The other configurations are the same as those in FIG. 4, and thus the description thereof is omitted here.

  FIG. 8 is a diagram illustrating a received signal gain adjustment processing method in the present embodiment when the variable attenuator 3e is used. In FIG. 8, the process in the radio | wireless apparatus 1 in FIG. 1 is demonstrated.

  The wireless communication unit 1 detects the start flag 30b of the transmission frame 1 (symbol 30) and notifies the measurement control / time measurement unit 5 of it. Upon receiving the notification, the measurement control / time measurement unit 5 detects the end of the transmission signal. In the end detection, the gain adjustment set value is the maximum set value M of the variable attenuator 3e (the maximum attenuation is set), and the signal amplification amount of the signal amplification / filter unit 3A is minimized. In the end detection, the measurement control / time measurement unit 5 proceeds to the transmission signal end detection phase and monitors the output change of the ADC 4. The measurement control / time measurement unit 5 regards the point in time when the output of the ADC 4 no longer changes as the end of the transmission signal.

Next, the wireless communication unit 1 detects the start flag 33b of the reception frame 2 (reference numeral 33) and notifies the measurement control / time measurement unit 5 of the detection. The measurement control / time measurement unit 5 proceeds to the gain adjustment phase and starts setting the variable attenuator 3e. The set value of the variable attenuator 3e is lowered by one step from the maximum set value M (setting with the maximum attenuation) to reduce the attenuation, and it is confirmed whether a change appears in the output of the ADC 4. The set value (MN) in which the output of the ADC 4 has changed is set as reception level detection. The offset value α is subtracted from the gain setting value, and the ADC input signal is increased by A _α which is a level difference between the signal level of the ADC detection threshold and the signal level of the transmission signal. As a result, the signal level of the transmission signal and the signal level of the reception signal become approximately the same.

  After the gain setting is completed, the measurement control / time measurement unit 5 proceeds to a reception signal end detection phase. Thereafter, the output change of the ADC 4 is monitored, and the time when the change in the output of the ADC 4 disappears is regarded as the end of the received signal.

  According to the present embodiment described above, similar to the above-described second embodiment, the same effects as those of the above-described first embodiment can be obtained, and further, gain adjustment and detection of end of transmission / reception frame (time measurement) can be performed. Can be realized on the same hardware configuration. Therefore, there is an advantage that the necessary hardware scale can be reduced.

Embodiment 4 FIG.
In the second and third embodiments described above, an example in which gain adjustment is performed only when the end of a received signal is detected on the assumption that the amplitude level of the transmission signal is constant (no attenuation due to radio wave propagation in the air) has been described. However, there may be a case where the amplitude level of the transmission signal is not constant, for example, the wireless transmission power of the wireless communication unit 1 and the amplification factor of the signal amplification / filter unit 3 or 3A vary depending on the installation temperature condition.

  FIG. 9 illustrates a gain adjustment processing method in which gain adjustment is performed when the end of both the transmission signal and the reception signal is detected and the amplitude levels of the transmission signal and the reception signal are matched when there is a variation in the amplitude level of the transmission signal. FIG. In FIG. 9, processing in the wireless device 1 in FIG. 1 will be described as an example. Note that the hardware configurations of the radio apparatuses 1 and 2 in the present embodiment are the same as those described in FIG. 4, so the description thereof is omitted here and reference is made to FIG. 4.

The wireless communication unit 1 detects the start flag 30b of the transmission frame 1 (symbol 30) and notifies the measurement control / time measurement unit 5 of it. Upon receiving the notification, the measurement control / time measurement unit 5 proceeds to the gain adjustment phase and starts setting the variable amplifier 3b. That is, the gain setting value is increased by one step to check whether a change appears in the output of the ADC 4. The gain setting value (+ Ns) in which the output of the ADC 4 has changed is set as transmission level detection. To increase only the ADC input signal level margin A _beta to the ADC detection threshold to be a value obtained by adding the offset value beta and the gain setting value. After the gain setting is completed, the measurement control / time measurement unit 5 shifts to a transmission signal communication end detection phase and monitors the output change of the ADC 4. The measurement control / time measurement unit 5 regards the point in time when the output of the ADC 4 no longer changes as the end of the transmission signal.

Next, the wireless communication unit 1 detects the start flag 33b of the received frame 2 (reference numeral 33) and notifies the measurement control / time measurement unit 5 of the start flag 33b. The measurement control / time measurement unit 5 enters the gain adjustment phase and starts setting the variable amplifier 3b. That is, the gain setting value is increased by one step to check whether a change appears in the output of the ADC 4. The gain setting value (+ Nr) in which the output of the ADC 4 has changed is used as reception level detection. To increase only the ADC input signal level margin A _beta to the ADC detection threshold to be a value obtained by adding the offset value beta and the gain setting value. After the gain setting is completed, the measurement control / time measurement unit 5 proceeds to a reception signal end detection phase. Thereafter, the measurement control / time measurement unit 5 monitors the change in the output of the ADC 4 and regards the time when the change in the output disappears as the end of the received signal.

  As described above, according to the present embodiment, when the transmission signal level varies by measuring the transmission signal level and the reception signal level during communication and adjusting the appropriate gain adjustment level for each communication frame. However, the transmission signal level and the reception signal level can be matched, and the measurement accuracy is not lowered due to radio wave attenuation, and the radio wave propagation time can be measured with high accuracy.

Embodiment 5 FIG.
In the fourth embodiment, the gain adjuster uses a variable amplifier, but a variable attenuator may be used. FIG. 10 is a diagram illustrating a received signal gain adjustment processing method according to the present invention when a variable attenuator is used. In FIG. 10, processing in the wireless device 1 in FIG. 1 will be described as an example. Note that the hardware configurations of radio apparatuses 1 and 2 in the present embodiment are the same as those described in FIG. 7, and therefore description thereof will be omitted here and FIG. 7 will be referred to.

In the present embodiment, the wireless communication unit 1 detects the start flag 30b of the transmission frame 1 (reference numeral 30) and notifies the measurement control / time measurement unit 5 of it. Upon receiving the notification, the measurement control / time measurement unit 5 proceeds to the gain adjustment phase and starts setting the variable attenuator 3e. That is, the set value of the variable attenuator 3e is decreased step by step from the maximum set value M (setting with the maximum attenuation) to decrease the attenuation, and it is confirmed whether or not a change appears in the output of the ADC 4. A set value (M-Ns) in which the output of the ADC 4 has changed is used as transmission level detection. To increase only the ADC input signal level margin A _beta to the ADC detection threshold to be a value obtained by subtracting the offset value beta and the gain setting value. After the gain setting is completed, the measurement control / time measurement unit 5 proceeds to the transmission signal end detection phase and monitors the output change of the ADC 4. The point in time when the change in the output of the ADC 4 disappears is regarded as the end of the transmission signal.

Next, the wireless communication unit 1 detects the start flag 33b of the received frame 2 (reference numeral 33) and notifies the measurement control / time measurement unit 5 of the start flag 33b. Upon receiving the notification, the measurement control / time measurement unit 5 proceeds to the gain adjustment phase and starts setting the variable attenuator 3e. In other words, the set value of the variable attenuator is decreased by one step from the maximum set value M (setting with the maximum attenuation) to reduce the attenuation, and it is confirmed whether a change appears in the ADC output. The set value (M-Nr) in which the output of the ADC 4 has changed is used as reception level detection. To increase only the ADC input signal level margin A _beta to the ADC detection threshold to be a value obtained by subtracting the offset value beta and the gain setting value. After the gain setting is completed, the measurement control / time measurement unit 5 proceeds to the reception signal end detection phase, monitors the change in the output of the ADC 4, and regards the time when the change in the output of the ADC 4 disappears as the end of the reception signal.

  As described above, according to the present embodiment, similarly to the above-described fourth embodiment, the transmission signal level and the reception signal level are measured during communication, and an appropriate gain adjustment level is adjusted for each communication frame. As a result, even when the transmission signal level varies, the transmission signal level and the reception signal level can be matched, and the radio wave propagation time can be accurately measured without causing a decrease in measurement accuracy due to radio wave attenuation.

It is the block diagram which showed the structure of the radio | wireless communication apparatus which concerns on Embodiment 1 of this invention. It is explanatory drawing which showed the generation | occurrence | production of the error resulting from attenuation of a received radio wave in a general distance measurement system. It is explanatory drawing which showed the error reduction system in the radio | wireless communication apparatus which concerns on Embodiment 1 of this invention. It is the block diagram which showed the hardware constitutions of the radio | wireless apparatus in the radio | wireless communication apparatus which concerns on Embodiment 2 of this invention. It is explanatory drawing which showed the gain adjustment processing system of the received signal of the radio | wireless apparatus by the side of transmission in the radio | wireless communication apparatus which concerns on Embodiment 2 of this invention. It is explanatory drawing which showed the gain adjustment processing system of the received signal of the radio | wireless apparatus of the receiving side in the radio | wireless communication apparatus which concerns on Embodiment 2 of this invention. It is the block diagram which showed the hardware constitutions of the radio | wireless apparatus in the radio | wireless communication apparatus which concerns on Embodiment 3 of this invention. It is explanatory drawing which showed the gain adjustment processing system of the received signal of the radio | wireless apparatus by the side of transmission in the radio | wireless communication apparatus which concerns on Embodiment 3 of this invention. It is explanatory drawing which showed the gain adjustment processing system of the transmission / reception signal of the transmission side radio | wireless apparatus in the radio | wireless communication apparatus which concerns on Embodiment 4 of this invention. It is explanatory drawing which showed the gain adjustment processing system of the transmission / reception signal of the radio | wireless apparatus of the transmission side in the radio | wireless communication apparatus which concerns on Embodiment 5 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Wireless communication part, 2 Antenna, 3, 3A Signal amplification / filter part, 3a, 3c, 3d, 3f Amplifier / filter, 3b Variable amplifier, 3e Variable attenuator, 4 ADC (A / D converter), 5 Measurement control Time measuring unit, 6 signal distributor, 11 wireless device 1, 12 wireless device 2, 30 transmission frame 1, 30a preamble, 30b start flag, 30c payload, 31 reception frame 1, 31a preamble, 31b start flag, 31c payload, 32 transmission frame 2, 32a preamble, 32b start flag, 32c payload, 33 reception frame 2, 33a preamble, 33b start flag, 33c payload, 40, 41 detection threshold.

Claims (3)

Wireless communication means for transmitting and receiving signals in wireless communication;
Amplifying means for amplifying the signal level of the transmitted / received signal by the wireless communication means;
Detection means for receiving the transmission / reception signal amplified by the amplification means and detecting a signal having a signal level larger than a predetermined detection threshold set in advance as the transmission signal or the reception signal, among the transmission / reception signals;
A distance detection unit that measures a radio wave propagation delay time from a round-trip time of a wireless communication signal based on a detection result by the detection unit to obtain a distance from the counterpart wireless terminal device, and performs gain adjustment of the amplification unit Measuring and measuring means including a gain adjusting unit ,
Wherein a signal level measured in the received signal received by the wireless communication means performs the determination of the gain adjustment value in accordance with the radio wave attenuation during communication for each reception signal,
By the gain adjustment based on the gain adjustment value, the wireless communication means transmits the signal level of the transmission signal transmitted to the counterpart wireless terminal apparatus from the counterpart wireless terminal apparatus corresponding to the transmission signal by the radio communication means. by combining a signal level of a reception signal received, a decrease in measurement accuracy due to electrostatic wave attenuation by preventing the radio terminal apparatus characterized by the measurement of the round trip time. Wireless communication means for transmitting and receiving signals in wireless communication;
Amplifying means for amplifying the signal level of the transmitted / received signal by the wireless communication means;
Detection means for receiving the transmission / reception signal amplified by the amplification means and detecting a signal having a signal level larger than a predetermined detection threshold set in advance as the transmission signal or the reception signal, among the transmission / reception signals;
A distance detection unit that measures a radio wave propagation delay time from a round-trip time of a wireless communication signal based on a detection result by the detection unit to obtain a distance from the counterpart wireless terminal device, and performs gain adjustment of the amplification unit Measuring and measuring means including a gain adjusting unit ,
The wireless communication unit a signal level of the received signal received by the signal level and the wireless communication unit of the transmission signal transmitted is measured by the gain corresponding to the variation of the signal level for each transmission signal and per received signal Determine the adjustment value,
By the gain adjustment based on the gain adjustment value, the wireless communication means transmits the signal level of the transmission signal transmitted to the counterpart wireless terminal apparatus from the counterpart wireless terminal apparatus corresponding to the transmission signal by the radio communication means. by combining a signal level of a reception signal received, a decrease in measurement accuracy due to electrostatic wave attenuation by preventing the radio terminal apparatus characterized by the measurement of the round trip time. The wireless terminal of claim 1 or 2, characterized in that it constitutes a distance detector and the gain adjusting unit of the measuring measuring means in a single circuit.

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