WO2012028917A1 - Système de réception à commutation d'antennes et dispositif de communication sans fil comprenant un tel système - Google Patents

Système de réception à commutation d'antennes et dispositif de communication sans fil comprenant un tel système Download PDF

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Publication number
WO2012028917A1
WO2012028917A1 PCT/IB2011/001937 IB2011001937W WO2012028917A1 WO 2012028917 A1 WO2012028917 A1 WO 2012028917A1 IB 2011001937 W IB2011001937 W IB 2011001937W WO 2012028917 A1 WO2012028917 A1 WO 2012028917A1
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WO
WIPO (PCT)
Prior art keywords
antenna
signal
antenna switching
unique word
unit
Prior art date
Application number
PCT/IB2011/001937
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English (en)
Japanese (ja)
Inventor
厳 茂住
秀樹 笠井
隆 藤井
Original Assignee
パナソニック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2010190074A external-priority patent/JP5658946B2/ja
Priority claimed from JP2011150867A external-priority patent/JP5747177B2/ja
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Priority to CN201180041431.7A priority Critical patent/CN103069727B/zh
Publication of WO2012028917A1 publication Critical patent/WO2012028917A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
    • H04B7/0808—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching comparing all antennas before reception
    • H04B7/0811—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching comparing all antennas before reception during preamble or gap period

Definitions

  • the present invention relates to an antenna switching reception system for switching and receiving an antenna in a wireless communication system.
  • level degradation due to multipath fading is one of the problems.
  • Signals received by the receiving antenna include not only signals input directly from the transmitting antenna to the receiving antenna, but also signals input via a plurality of different paths. For this reason, signals (multipaths) having different delay times are also input to the receiving antenna, so that the reception level deteriorates by overlapping and canceling signals at the receiving antenna end. This is a phenomenon called level degradation due to multipath fading.
  • a multicarrier transmission technique such as OFDM.
  • “Selective diversity” is a technology that monitors reception levels at multiple antennas and receives signals with optimal antennas, but requires as many receivers as the number of antennas, which increases the circuit scale. There were drawbacks. “Combining diversity” is a technology that combines the phases of signals received by multiple antennas, but this also requires as many receivers as the number of antennas and a phase shifter that matches the phases of each signal. There was a drawback that the circuit scale was increased. “Switching diversity” is a technique for reducing the influence of multipath fading by switching to the other antenna when there is an influence of multipath fading on one antenna (see, for example, Patent Document 1). In recent years, with the widespread use of portable wireless devices, the antenna switching unit is also required to be downsized and cost-reduced, and can be configured with a single receiver. Diversity "is installed in various wireless devices. Japanese Patent Laid-Open No. 06-303218
  • an object of the present invention is to provide an antenna switching receiving system that can reduce the influence of level fluctuation due to multipath fading by selecting an antenna with high signal quality accurately even in an environment with many multipaths with a simple configuration. To do.
  • an antenna switching receiving system that switches a plurality of antennas and receives a radio signal
  • the antenna that receives the payload by comparing the quality of the received radio signal while switching the antenna at a predetermined period
  • an antenna control unit that controls switching of an antenna
  • a unique word setting unit that presets and stores a bit string of a known unique word
  • an antenna The unique word detection unit that searches the bit string of the received radio signal while switching the signal and detects the same bit string as the unique word stored by the unique word setting unit, and the quality of the received radio signal for each antenna
  • a signal quality comparison unit is provided for comparison.
  • the antenna control unit selects the antenna determined to have the highest signal quality as a result of comparison by the signal quality comparison unit, and receives the subsequent payload. It is preferable to do.
  • a plurality of unique words consisting of different bit strings are transmitted from a corresponding transmission system in a specific order before a payload, and a plurality of unique words transmitted from the transmission system
  • a plurality of the same unique words are preset and stored by the unique word setting unit
  • the unique word detection unit is a plurality of unique word detection units that individually detect the plurality of unique words, and the plurality of unique words
  • the antenna control unit preferably selects an antenna that is determined to have the highest signal quality.
  • the signal quality comparison unit includes a reception level comparison unit that compares levels of radio signals received by the antennas.
  • the signal quality comparison unit compares the number of errors in the bit string of the radio signal received by each antenna with respect to the bit string of the unique word stored in the unique word setting unit. It is preferable to have a number comparison part.
  • a preamble for establishing bit synchronization is transmitted from each corresponding transmission system before each unique word, and the unique word error number comparison unit includes a bit string of the preamble and the unique word.
  • the preamble unique word error number comparison unit compares the number of errors in the bit string of the radio signal received by each antenna.
  • the antenna switching reception system further comprising: a first counter that counts a first predetermined time that is a reception interval of unique words in one packet, wherein the unique word detection unit receives a radio signal received by any antenna When the unique word is detected, the first counter starts counting, and when the unique word reception interval is counted, it is preferable to detect the next unique word from the signal received by another antenna.
  • the antenna switching receiving system according to the first aspect further includes a second counter that counts a second predetermined time after switching the antenna until the second counter counts the second predetermined time after switching the antenna. It is preferable not to detect a unique word.
  • the antenna switching reception system further includes a packet end detection unit that detects the end of the packet, and when the packet end detection unit detects the end of the packet, the antenna control unit performs control to switch the antenna at a predetermined period. It is preferable to return automatically to receive the next packet.
  • the antenna switching receiving system further includes a third counter that counts a third predetermined time after detecting a specific unique word, and the unique word until the third counter counts the third predetermined time. It is preferable not to detect this.
  • the antenna switching reception system further includes a reception level detection unit for detecting a level of a received radio signal, and the unique word after the reception level detection unit detects a signal level equal to or higher than a predetermined first threshold.
  • the detection unit starts searching for a unique word.
  • preambles and unique words that are twice the number of mounted antennas are transmitted, and that each antenna is switched at a cycle that is twice the preamble and unique word transmission cycle. .
  • a reception level notification unit that detects a level of a received radio signal and notifies the user, and a switching function setting unit for the user to set the validity / invalidity of the antenna switching function. It is preferable to further provide.
  • a reception level detection unit that detects a level of a received radio signal, and an antenna switching function is disabled when the reception level detection unit detects a signal level that is equal to or higher than a predetermined second threshold. It is preferable to further include a switching function control unit.
  • the switching function setting unit or the switching function control unit invalidates the antenna switching function, it is preferable to notify the corresponding transmission system to that effect.
  • the switching function setting unit or the switching function control unit enables the antenna switching function. It is preferable to make it.
  • the payload when the payload is successfully received, it is preferable to transmit an ACK to that effect to the corresponding transmission system.
  • the antenna switching reception system according to the first aspect further includes an antenna switching reception system and a transmission unit that transmits a radio signal.
  • the antenna control unit A wireless communicator that uses an antenna selected during reception is preferred.
  • the antenna switching reception system that switches a plurality of antennas and receives a radio signal
  • the test signal is received and the payload signal is received by each antenna.
  • An antenna switching receiving system is provided in which an antenna that selects an antenna and receives the test signal is switched based on an antenna switching timing detection signal detected before the test signal.
  • the antenna switching timing detection signals are configured by a specific sequence of signal sequences and transmitted, and are arranged in the same sequence as the transmitted antenna switching timing detection signals.
  • a correlation value calculation unit that calculates a correlation value of the signal sequence stored in the storage unit and the signal sequence of the received antenna switching timing detection signal, and the antenna It is preferable to detect the switching timing detection signal based on the correlation value calculated by the correlation value calculation unit.
  • the antenna switching timing detection signal can be demodulated even in a saturated state without depending on the reception level.
  • the antenna switching reception system includes a counter unit that counts time from a specific antenna switching reference timing to the next antenna switching reference timing, and detects the antenna switching reference timing based on the count value of the counter unit It is preferable.
  • the antenna switching timing detection signal is transmitted a plurality of times within one frame, and every predetermined period with a period not less than twice the length of the antenna switching timing detection signal.
  • the antenna switching timing detection signal is not detected for a predetermined period after the detection of the antenna switching timing detection signal.
  • the antenna switching timing detection signal is not detected for a predetermined period after the unique word signal is further detected after the antenna switching timing detection signal is detected.
  • the antenna switching reception system according to the second aspect includes a non-detection time counter unit that counts a time during which the antenna switching timing detection signal is not detected, and the non-detection time counter unit receives a predetermined value during reception by any antenna. When the time is counted, it is preferable to switch to another antenna.
  • the test signal is configured to be transmitted in a specific sequence of signal sequences
  • the storage unit is a signal sequence in the same sequence as the test signals to be transmitted.
  • the calculation unit preferably receives the payload signal without performing antenna switching when detecting the test signal based on the calculated correlation value.
  • a plurality of the second correlation value calculation units are provided corresponding to the number of the test signals.
  • the antenna that receives the test signal and receives the payload signal is selected by each antenna, so that the level fluctuation due to multipath fading can be achieved with a simple configuration. Can reduce the effects of As a result, even in a multipath environment, it is easy to avoid the occurrence of errors due to reception level degradation due to multipath fading.
  • the block diagram which shows the structure of the antenna switching receiving system by 1st Embodiment of this invention.
  • the block diagram which shows the structure of the modification of the antenna switching reception system by the said embodiment.
  • the block diagram which shows the structure of another modification of the antenna switching system by the said embodiment.
  • wireless communications system The block diagram which shows schematic structure of the antenna switching receiving system by 2nd Embodiment of this invention. The figure which shows the operation
  • movement of the modification The block diagram which shows schematic structure of another modification of the same antenna switching reception system. The figure which shows the operation
  • the block diagram which shows schematic structure of another modification of the same antenna switching reception system The figure which shows the operation
  • movement of the modification The block diagram which shows schematic structure of another modification of the same antenna switching reception system. The figure which shows the operation
  • the antenna switching reception system is built in, for example, a switchboard having a wireless communication function.
  • This type of switchboard receives instructions wirelessly transmitted from a monitor device operated by an administrator, and wirelessly transmits information such as power consumption.
  • the monitor device that has received the information such as the power consumption transmitted from the switchboard displays the current or accumulated power consumption of the area where the power is distributed by the switchboard.
  • the switchboard and the monitor device are provided with a wireless communication function so that the monitor device can be appropriately installed and moved according to the environment and the like.
  • the monitor device is provided with a single antenna
  • the switchboard is provided with a plurality of antennas.
  • the switchboard performs stable wireless communication with the monitor device while selecting and switching the antenna suitable for the surrounding environment by the antenna switching reception system.
  • FIG. 1 shows a configuration of an antenna switching reception system.
  • the antenna switching reception system includes a receiver 01, a plurality of antennas 02, and the like.
  • the receiver 01 includes an antenna switching unit 03, an RF unit 04, a baseband unit 05, and the like.
  • the antenna switching unit 03 switches the antenna that receives the radio signal among the two antennas A and B configuring the antenna 02.
  • the RF unit 04 down-converts a radio signal received using the antenna A or B and extracts a baseband signal.
  • the baseband unit 05 processes the baseband signal extracted by the RF unit 04.
  • the baseband unit 05 includes a demodulation unit 06, a synchronization establishment unit 07, a unique word setting unit 08, a unique word detection unit 09, an antenna control unit 10, and the like.
  • the demodulator 06 demodulates the baseband signal extracted by the RF unit 04.
  • the synchronization establishment unit 07 establishes bit synchronization of the demodulated baseband signal.
  • the unique word setting unit 08 presets and stores a bit string of a known unique word. A known unique word is shared with a corresponding transmission system, and a packet with this unique word is transmitted from the transmission system.
  • the unique word detection unit 09 searches the demodulated baseband signal and detects a bit string of the unique word.
  • the antenna control unit 10 controls antenna switching. That is, the antenna control unit 10 determines whether or not to switch the antenna based on the detection result of the bit string of the unique word by the unique word detection unit 09, and sends a control signal for switching the antenna to the antenna switching unit 03. Output.
  • two antennas are switched by the antenna switching unit 03 to receive a radio signal, but the number of antennas may be three or more.
  • FIG. 2 shows the operation of the antenna switching reception system.
  • FIG. 3 shows a relationship between a signal transmitted from the corresponding transmission system and an antenna switched by the antenna switching reception system.
  • One packet is composed of a plurality of pairs of preambles and unique words followed by a payload that is transmitted subsequently.
  • the antenna switching reception system receives a radio signal transmitted from the transmission system (# 2) while switching the antennas A and B at a predetermined cycle (# 1).
  • the received signal is down-converted by the RF unit 04 (# 3), demodulated by the demodulation unit 06 of the baseband unit 05 (# 4), bit synchronization is established by the synchronization establishment unit 07 (# 5), and unique word detection is performed.
  • the unique word is detected by the unit 09 (# 6). At this time, the preamble and the unique word are transmitted twice to each antenna so that the preamble and the unique word can be received even if the antennas A and B are switched at any timing.
  • the preamble and the unique word are transmitted four times each as shown in FIG. In this way, a preamble and unique word twice as many as the number of antennas mounted in the antenna switching reception system are transmitted, and each antenna is switched at a cycle twice the preamble and unique word transmission cycle.
  • the preamble transmitted for the first time cannot be received because the antenna was switched during reception, and the preamble or unique word transmitted for the second time was affected by multipath fading for antenna B. The case where it cannot receive by this is shown. In this case, since bit synchronization cannot be established, a unique word cannot be detected (NO loop is repeated in # 6).
  • the preamble transmitted for the third time cannot be received because the antenna is switched during reception, and the preamble transmitted for the fourth time is received by the antenna A, bit synchronization is established, and a unique word is detected. .
  • the antenna is fixed to A (# 7), and the subsequent payload is received (# 8).
  • the quality of the received radio signal is compared while switching the antenna at a predetermined cycle, and the antenna that receives the payload is selected. For this reason, even in an environment where multipath occurs frequently, antenna selection can be completed before receiving the payload of each packet for a signal for receiving new packets one after another asynchronously.
  • FIG. 4 shows a configuration of a modified example of the antenna switching reception system according to the above embodiment.
  • the system of this modified example further includes a threshold setting unit 11 with respect to the system shown in FIG.
  • the threshold setting unit 11 sets a threshold relating to the degree of coincidence between the bit string of the unique word and the bit string of the received radio signal while switching the antennas A and B.
  • the unique word is composed of a 32-bit bit string
  • the bit string of the unique word and the bit string of the received wireless signal do not match by several bits due to an instantaneous change in the communication environment during reception of the unique word. There is.
  • the threshold is set to 30 bits.
  • the threshold value is set according to the allowable limit value of the number of errors in the bit string of the received radio signal with respect to the bit string of the unique word.
  • FIG. 5 shows the operation of the antenna switching reception system according to this modification.
  • the unique word detection unit 09 After bit synchronization is established by the synchronization establishment unit 07 (# 5), the unique word detection unit 09 compares the bit string of the unique word stored by the unique word setting unit 08 with the bit string of the received radio signal. At this time, when the number of bits equal to or greater than the threshold set by the threshold setting unit 11 matches (YES in # 9), the unique word detection unit 09 determines that a unique word has been detected, and proceeds to # 7.
  • FIG. 6 shows a configuration of another modified example of the antenna switching reception system according to the above embodiment.
  • FIG. 7 shows the operation of the antenna switching reception system according to this modification.
  • FIG. 8 shows an example of a relationship between a signal transmitted from a corresponding transmission system and an antenna switched by the antenna switching reception system.
  • FIG. 9 shows another example of the relationship between the signal transmitted from the corresponding transmission system, the antenna switched by the antenna switching reception system, and the signal received by each antenna.
  • a plurality of unique words consisting of different bit strings are transmitted from the corresponding transmission system in a specific order before the payload.
  • a plurality of unique words that are the same as the plurality of unique words transmitted from the corresponding transmission system are preset and stored by the unique word setting unit 08. That is, in FIG. 9, each unique word (UW1 to UW4) is composed of different bit strings. In the case shown in FIG. 8, the unique words UW1 to UW3 may be the same and only the unique word UW4 may be different.
  • the multiple unique word detection unit 12 individually detects the multiple unique words UW1 to UW4. Then, a different antenna selection operation is assigned to each unique word detected by the multiple unique word detection unit 12. In FIG.
  • the process returns to # 2.
  • the unique words UW1 to UW3 may be the same and only the unique word UW4 may be different.
  • # 13 to # 32 the operations of # 13 to # 32 will be described.
  • the multiple unique word detection unit 12 After switching the antenna (# 15), the multiple unique word detection unit 12 searches for the unique word UW2 (# 16), and when the unique word UW2 is detected (YES in # 17), the signal quality comparison unit 13 Detects the quality of the unique word UW2 (# 18). Furthermore, the signal quality comparison unit 13 compares the signal quality of the unique word UW1 and the unique word UW2 and selects the antenna that receives the payload. As an example of this case, FIG. 9 shows an operation in which the unique word UW1 received by the antenna A has better signal quality than the unique word UW2 received by the antenna B, and the antenna is switched again to receive the payload by the antenna A. It is shown.
  • the unique word UW2 After antenna switching, that is, if the signal quality of the unique word UW2 is good (NO in # 19), the unique word UW2 is fixed to the received antenna (# 20), and the process proceeds to # 12.
  • the antenna switching that is, if the signal quality of the unique word UW1 is good (YES in # 19)
  • the antenna is switched to the antenna that received the unique word UW1 (# 21), and the process proceeds to # 12.
  • the reason why the unique word UW4 is received in # 12 is to find the payload.
  • the signal quality comparison unit 13 When the next unique word UW2 is searched and detected by the multiple unique word detection unit 12 (YES in # 22), the quality of the radio signal received by the signal quality comparison unit 13 is detected (# 23). That is, the signal quality of the unique word UW2 is detected.
  • the multiple unique word detection unit 12 After switching the antenna (# 24), the multiple unique word detection unit 12 searches for the unique word UW3 (# 25), and when the unique word UW3 is detected (YES in # 26), the signal quality comparison unit 13 Detects the quality of the unique word UW3 (# 27). Furthermore, the signal quality comparison unit 13 compares the signal qualities of the unique word UW2 and the unique word UW3 and selects the antenna that receives the payload.
  • the unique word UW3 After antenna switching, that is, if the signal quality of the unique word UW3 is good (NO in # 28), the unique word UW3 is fixed to the received antenna (# 29), and the process proceeds to # 12.
  • the antenna switching that is, if the signal quality of the unique word UW2 is good (YES in # 28)
  • the antenna is switched to the antenna that received the unique word UW2 (# 30), and the process proceeds to # 12.
  • the unique word UW2 is not detected by the multiple unique word detection unit 12 (NO in # 22)
  • the unique word UW2 is not detected by the multiple unique word detection unit 12 (NO in # 22)
  • the unique word UW2 is not detected by the multiple unique word detection unit 12 (NO in # 22)
  • the unique word UW3 is searched and detected by the multiple unique word detection unit 12 (YES in # 31)
  • the unique word UW3 is fixed to the antenna that received it (# 32), and the process proceeds to # 12.
  • the process proceeds to # 12 without fixing the antenna (that is, with periodic antenna switching).
  • the signal quality comparison unit 13 compares the signal quality of the unique word UW1 and the unique word UW2, and when the unique word UW2 is detected, the unique word UW2 and the unique word UW3 are detected. Compare signal quality.
  • the unique words UW1 and UW2 cannot be detected by one antenna and the unique word UW3 or UW4 is detected by the other antenna, it is not meaningful to switch the antenna. Do not compare levels.
  • the unique words UW1 and UW2 may not be detected due to the influence of instantaneous noise or the like. Therefore, when the unique word UW3 is detected by the multiple unique word detection unit 12 in # 31, the antenna is switched to detect the unique word UW4, and the signal quality of the unique word UW3 and the unique word UW4 is compared. Also good. In # 17, when the unique word UW2 cannot be detected, the unique word UW3 or UW4 may be detected, and the signal quality of the unique word UW1 and the unique word UW3 or UW4 may be compared.
  • the unique word UW4 may be detected and the signal quality of the unique word UW2 and the unique word UW4 may be compared.
  • a plurality of unique words that are the same as the plurality of unique words stored in the unique word setting unit are transmitted in the same order before the payload, and the plurality of unique word detection units 12 UW1 to UW4 are detected individually. This makes it possible to assign different antenna selection operations for each detected unique word. For example, when the last unique word UW4 immediately before the payload is detected, the subsequent payload can be received without switching the antenna.
  • the signal quality comparison unit 13 compares the quality of signals received by the respective antennas, and the antenna control unit 10 selects an antenna that is determined to have higher signal quality and receives the payload. As a result, it is possible to receive a payload with an antenna that always obtains a higher quality received signal.
  • the signal quality comparison unit 13 compares the quality of the signal received by each antenna, selects the antenna that is determined to have the highest signal quality, and loads the payload.
  • FIG. 10 shows a configuration of still another modified example of the antenna switching reception system according to the above embodiment. The system of this modification applies a reception level comparison unit 14 as one form of the signal quality comparison unit 13 in the system shown in FIG.
  • the reception level comparison unit 14 detects and compares the reception level of each antenna.
  • the reception level of the antenna can be acquired by detecting, for example, RSSI (Received Signal Strength Indication).
  • FIG. 11 shows the operation of the antenna switching reception system according to this modification.
  • the reception level comparison unit 14 detects the reception level of the switched antenna (# 36), and compares the reception level (# 37). As a result, if the reception level before the antenna switching is good (YES in # 37), the antenna is switched to the antenna that received the unique word UW1 or UW2 in # 33 (# 21), and the process proceeds to # 8. On the other hand, if the reception level after antenna switching is good (NO in # 37), the antenna is fixed without switching (# 20), and the process proceeds to # 8. In this modification, since the reception level is compared after detecting the unique word UW1 or UW2, it is possible to eliminate the influence of interference waves transmitted from devices other than the corresponding transmission system.
  • FIG. 12 shows a configuration of still another modified example of the antenna switching reception system according to the above embodiment.
  • the system of this modification uses a unique word error number comparison unit 15 as one form of the signal quality comparison unit 13 in the system shown in FIG.
  • the unique word error number comparison unit 15 compares the number of errors in the bit string of the radio signal received by each antenna with respect to the bit string of the unique word stored in the unique word setting unit. The number of errors is counted when the multiple unique word detection unit 12 detects a unique word.
  • FIG. 13 shows the operation of the antenna switching reception system according to this modification.
  • the unique word error number comparison unit 15 After the bit synchronization is established by the synchronization establishment unit 07 (# 5), when the unique word UW1 or UW2 is detected by the multiple unique word detection unit 12 (YES in # 33), the unique word error number comparison unit 15 The number of unique word errors is detected and the antenna is switched (# 38). If the multiple unique word detection unit 12 cannot detect the unique word UW1 or UW2 (NO in # 33), the process returns to # 2. When the unique word UW1 or UW2 is detected, the unique word error number comparison unit 15 detects the number of errors of the unique word in the switched antenna (# 39). Then, the unique word error number comparison unit 15 compares the number of unique word errors detected before and after the antenna switching (# 40).
  • FIG. 14 shows a configuration of still another modified example of the antenna switching reception system according to the above embodiment.
  • the system of this modification uses a reception level comparison unit 14 and a unique word error number comparison unit 15 as one form of the signal quality comparison unit 13 in the system shown in FIG.
  • the reception level comparison unit 14 detects and compares the reception level of each antenna.
  • the reception level of the antenna can be acquired by detecting, for example, RSSI (Received Signal Strength Indication).
  • the unique word error number comparison unit 15 compares the number of errors in the bit string of the radio signal received by each antenna with respect to the bit string of the unique word stored in the unique word setting unit. The number of errors is counted when the multiple unique word detection unit 12 detects a unique word.
  • FIG. 15 shows the operation of the antenna switching reception system according to this modification.
  • the 16 shows the relationship between the signal transmitted from the corresponding transmission system, the antenna switched by the antenna switching reception system, and the signal received by each antenna.
  • the reception level comparison unit 14 Detects the reception level of the antenna that detected the unique word.
  • the unique word error number comparison unit 15 detects the number of unique word errors and switches the antenna (# 41). The number of errors detected here is equal to or less than the allowable limit value described in paragraph “0043” because the unique word UW1 or UW2 is detected in # 33.
  • the unique word UW1 is received by the antenna A, the number of errors of the unique word UW1 and the reception level of the antenna A are detected, and the antenna B is switched to. If the multiple unique word detection unit 12 cannot detect the unique word UW1 or UW2 (NO in # 33), the process returns to # 2.
  • the unique word error number comparison unit 15 detects the number of unique word errors in the switched antenna, and the reception level comparison unit 14 detects the reception level of the switched antenna ( # 42).
  • the unique word UW2 is received by the antenna B, and the number of errors of the unique word UW2 and the reception level of the antenna B are detected.
  • the reception level comparison unit 14 determines the reception level. Are compared (# 37). In this case, the number of errors detected at # 41 and # 42 is both equal to or less than the allowable limit value.
  • the comparison of the reception levels as shown in FIG. 16, before the antenna switching, that is, if the reception level of the unique word UW1 is good (YES in # 37), the antenna is switched to the antenna that received the unique word UW1 (# 21). ), Move to # 8.
  • the unique word UW2 is fixed to the received antenna B (# 20), and the process proceeds to # 8.
  • the unique word UW2 is first detected in # 33, the number of errors and the reception level of the unique word UW3 are detected after antenna switching (# 41) (# 42). Further, when the unique word UW3 or UW4 is detected first, antenna switching is not performed (not shown in FIG. 15). By comparing the number of errors detected in # 41 and # 42, the probability that an antenna with high signal quality can be determined is not 100%, but it can be expected at a certain level of practically no problem.
  • the same bit string received by antenna B with respect to the number of errors in the bit string of the unique word received by antenna A There is a probability that the number of errors is small. However, if the probability is low enough not to be a problem, if the number of errors is different, select an antenna with a small number of errors and select an antenna by comparing the reception level only when the number of errors is the same. You can also. In this modification, the level of the radio signal received by a plurality of antennas and the number of errors in the bit string of the radio signal received by each antenna are compared, and the payload is received while being fixed to the optimum antenna.
  • the correct antenna can be selected by comparing the reception levels. Even when the number of errors in the bit string of the radio signal received by each antenna is equal, the correct antenna can be selected by comparing the reception levels. In addition to the comparison of the reception level, the number of errors in the bit string of the unique word Since the antenna selection is also performed in combination with the detection result, it is possible to prevent erroneous antenna selection due to the influence of the interference wave from the transmission system other than the communication partner. (Modification) FIG.
  • FIG. 17 shows a configuration of still another modified example of the antenna switching reception system according to the above embodiment.
  • a preamble / unique word error number comparison unit 16 is applied as one form of the signal quality comparison unit 13 in the system shown in FIG.
  • the preamble / unique word error number comparison unit 16 compares the number of errors in the bit string of the radio signal received by each antenna with respect to the bit string of the preamble and the unique word. The number of errors is detected after the multiple unique word detection unit 12 detects a unique word and switches antennas.
  • FIG. 18 shows the operation of the antenna switching reception system according to this modification.
  • the antenna is switched (# 35). Then, the preamble / unique word error number comparison unit 16 detects the number of errors including not only the next unique word but also the preamble immediately before the unique word (# 44). In FIG. 19, after the unique word UW1 is detected by the antenna A, the antenna is switched, and the number of errors in the preamble and the unique word UW2 is detected by the antenna B.
  • the antenna is further switched (# 45), and the preamble / unique word error number comparison unit 16 detects the number of errors of the next preamble and unique word (# 46) as in # 44.
  • the preamble / unique word error number comparison unit 16 compares the number of preamble and unique word errors detected before and after antenna switching (# 47), and selects the antenna that receives the payload (# 20, # 21). .
  • the number of preamble and unique word errors received by the antenna A is small, and the payload is received by being fixed to the antenna A. In the example shown in FIG.
  • the unique word UW2 and the unique word UW3 are compared with each other including a pair of preambles for the following reason. That is, since the preamble that is paired with the unique word UW1 is not established in bit synchronization, it cannot be distinguished from “0” or “1” and cannot be used for comparison of the number of errors.
  • the unique word UW1 cannot be detected and the unique word UW2 is detected, the error numbers of the unique word UW3 and the unique word UW4 are compared with each other including the pair of preambles.
  • antenna switching is not performed. In FIG.
  • the number of errors in the preamble and the unique word UW2 is subsequently detected, and after switching to the antenna B, the number of errors in the preamble and the unique word UW3 is detected. May be.
  • the number of errors in the bit sequence of the radio signal received by each antenna with respect to the known bit sequence of the preamble and unique word is compared, and the payload with the smallest number of errors is selected and fixed. For this reason, the number of bits used for antenna selection increases, and the accuracy of antenna selection determination can be further improved.
  • FIG. 20 shows a configuration of still another modified example of the antenna switching reception system according to the above embodiment.
  • the system of this modification uses a unique word error number comparison unit 15 as one form of the signal quality comparison unit 13 in the system shown in FIG.
  • a first counter 17 is further provided.
  • the first counter 17 has a first predetermined time corresponding to the reception interval of the unique words at both ends of the preamble (after detecting a unique word in one packet, until the beginning of the next unique word is received). Time).
  • FIG. 3 FIG.
  • FIG. 21 shows the operation of the antenna switching reception system according to this modification.
  • the unique word error number comparison unit 15 detects the number of unique word errors and switches the antenna (# 38).
  • the first counter 17 starts and continues counting (NO in # 48, # 49, and # 50), and counts the first predetermined time corresponding to the preamble transmission time (YES in # 50). Is considered to have started receiving unique words. Accordingly, the plural unique word detection unit 12 detects a unique word, and the unique word error number comparison unit 15 detects the number of errors of the unique word (# 51). If the number of errors after antenna switching is small (NO in # 40), the antenna is switched to the antenna after switching (# 20), and the process proceeds to # 8. If the number of errors before antenna switching is small (YES in # 40), the antenna is switched again (# 21), and the process proceeds to # 8.
  • the first counter 17 counts from the timing when the unique word is detected by one antenna to the timing when the unique word for comparison is detected by the other antenna. Then, the unique word error number comparison unit 15 regards the bit string starting from that timing as the bit string of the next unique word and detects the error number of the unique word.
  • the reception level of the other antenna is low, or due to the influence of sudden noise, etc., bit synchronization cannot be established in the next preamble, or the unique word is at the same level as the noise. Even in this case, the unique word is detected from the signal received by the other antenna, and the number of errors can be detected.
  • FIG. 22 shows a configuration of still another modified example of the antenna switching reception system according to the above embodiment.
  • the system of this modification uses a unique word error number comparison unit 15 as one form of the signal quality comparison unit 13 in the system shown in FIG. Further, in this modification, a second counter 18 is further provided.
  • the second counter 18 counts the second predetermined time after switching the antenna.
  • the second predetermined time counted by the second counter 18 is a time required for at least the transmission system corresponding to the transmission of the bit string constituting the unique word.
  • FIG. 23 shows the operation of the antenna switching reception system according to this modification.
  • FIG. 24 shows the relationship between the signal transmitted from the corresponding transmission system, the antenna switched by the antenna switching reception system, and the signal received by each antenna in the configuration without the second counter 18 of the present modification. Indicates.
  • FIG. 23 shows the operation of the antenna switching reception system according to this modification.
  • FIG. 24 shows the relationship between the signal transmitted from the corresponding transmission system, the antenna switched by the antenna switching reception system, and the signal received by each antenna in the configuration without the second counter 18 of the present modification. Indicates.
  • FIG. 25 shows the relationship between the signal transmitted from the corresponding transmission system, the antenna switched by the antenna switching reception system, and the signal received by each antenna in the configuration having the second counter 18 of the present modification. Show.
  • the receiving antenna is switched from the antenna A having good reception state to the antenna B being affected by fading at the timing T1 of the remaining several bits (for example, 1 bit) of the unique word UW1.
  • the reception state of the antenna A is good before the timing T1, and the number of errors of the unique word UW1 is less than the allowable limit value described above.
  • the unique word detection unit 09 determines that the unique word UW1 has been detected from the signal received by the antenna B that has received the “tail” of the unique word UW1. After that, the unique word UW2 is detected after switching to the antenna A at T2, but if an error of several bits or more occurs in this process, the antenna control unit 10 uses the antenna as an antenna for receiving the payload. B will be selected by mistake. However, since the antenna B is affected by fading as described above, an error occurs in receiving the payload.
  • the occurrence of the above problem is also caused by the unique word detection unit 09 determining that the unique word has been received by the antenna that has received the “tail” of a unique word.
  • the unique word detection unit 09 determines that the unique word has been received by the antenna that has received the "head” of a unique word, the same problem occurs depending on the antenna switching timing. Therefore, in this modification, after switching the antenna, until the second counter 18 counts a predetermined time, the unique word is not detected (the unique word detection result is invalidated), thereby Prevent the occurrence of defects. That is, in FIG. 23, when the antenna is switched in # 1, after resetting the second counter (# 52), the process proceeds to # 2 while starting / continuing counting (# 53) and receives a radio signal.
  • the process returns to # 1, switches the antenna, and repeats the loops # 1 to # 53.
  • the unique word UW4 is detected and the payload is received (# 8).
  • the predetermined cycle in # 53-3 is the same as the predetermined cycle in # 1, and is a cycle twice the preamble and unique word transmission cycle.
  • the second counter 18 is set to the second predetermined time. Until the word is counted, the unique word is not detected. Thereby, since the unique word UW1 is not detected by the antenna B, the problem shown in FIG.
  • the unique words UW2 and UW3 are not detected by the antenna B affected by fading. Then, during the reception of the unique word UW3, when a predetermined period of switching antenna # 53 # 3 arrives and the antenna is switched, the unique word UW4 is detected by the antenna A, and the payload can be received. In this modification, after the antenna is switched, the unique word is not detected until the second predetermined time corresponding to the time required for transmitting the bit string constituting the unique word is counted by the second counter 18. It is configured.
  • FIG. 26 shows a configuration of a modified example of the antenna switching reception system according to the embodiment.
  • the system of this modification further includes a packet end detection unit 19 with respect to the system shown in FIG.
  • the packet end detection unit 19 detects the end of the packet.
  • the end of the packet can be known, for example, by detecting a packet end signal attached to the end of the payload.
  • FIG. 27 shows the operation of the antenna switching reception system according to this modification.
  • the reception of the payload is started in # 8
  • the reception of the payload is continued until the packet end is detected (NO in # 54).
  • the process returns to # 1, and the antenna control unit 10 automatically returns to the control for switching the antenna at a predetermined period, and receives the next packet.
  • the process automatically switches to periodic antenna switching and returns to the search for a unique word.
  • FIG. 28 shows a configuration of a modified example of the antenna switching reception system according to the above embodiment.
  • the system of this modification further includes a unique word error number comparison unit 15 and a third counter 20 with respect to the system shown in FIG.
  • the third counter 20 counts the third predetermined time after detecting the last unique word (immediately before the payload) in the packet being received by the multiple unique word detector 12. Since the data included in the payload is arbitrary, it is rare that the bit string of the payload matches the bit string of the unique word.
  • FIG. 29 shows the operation of the antenna switching reception system according to this modification.
  • the multiple unique word detector 12 detects the last unique word (YES in # 55)
  • the third counter 20 starts counting (# 55-2). Then, after passing through # 7 and # 8, no unique word is detected during the counting of the third counter 20 (NO loop in # 55, # 7, # 8, and # 56).
  • the third counter 20 stops counting, resets the count value, and returns to # 1.
  • 30 and 31 show the relationship between the packet received according to this modification and the third predetermined time.
  • 30 shows regular communication
  • FIG. 31 shows non-periodic communication.
  • the third predetermined time is a time from when a unique word of a packet is received to immediately before the next packet is received.
  • the packet reception interval is unknown in the non-periodic communication shown in FIG. 31, after receiving a unique word of a packet, the time during which the payload in the packet is received can be set as the third predetermined time. .
  • the time corresponding to the data length is set as the third predetermined time.
  • the above-described packet end detection unit 19 may detect the packet end signal instead of the third counter 20 counting the third predetermined time.
  • the multiple unique word detection unit 12 detects any specific unique word instead of detecting the last unique word, and counts a third predetermined time including the time from there to the beginning of the payload in the packet. It may be a configuration. In the present modification, since the unique word is not detected for the third predetermined time after the unique word is detected, it is possible to avoid erroneously detecting the bit string in the payload as the unique word. Is possible.
  • FIG. 32 shows a configuration of a modified example of the antenna switching reception system according to the embodiment.
  • the system of this modification further includes a reception level detection unit 21 with respect to the system shown in FIG.
  • the reception level detection unit 21 detects the level of the radio signal received via any one of the antennas.
  • the reception system has two operation modes: a “low consumption mode” and a normal “diversity reception mode”.
  • the antenna switching unit 03, the RF unit 04, the antenna control unit 10, and the reception level detection unit 21 operate in the same manner as in the normal “diversity reception mode”, and other blocks sleep with low power consumption. Wait in state.
  • the reception level detection unit 21 detects a signal level equal to or higher than a predetermined first threshold
  • the reception system shifts to a normal “diversity reception mode”.
  • the reception level detection unit 21 does not detect a signal level equal to or higher than a predetermined threshold for a predetermined period, the mode shifts to the “low consumption mode”.
  • FIG. 33 shows the operation of the antenna switching reception system according to this modification.
  • FIG. 34 shows the relationship between received packets and operation mode switching.
  • a control signal for antenna switching is output from the antenna control unit 10 to the antenna switching unit 03, and the antenna is set to a predetermined level. The cycle is switched (# 1).
  • the antenna is fixed during standby in “low-consumption mode”, if it is affected by fading, the reception level at that antenna may be kept low, and it may not be possible to switch to “diversity reception mode”. There is. Therefore, in the present modification, the antenna is switched at a predetermined cycle even when operating in the low consumption mode so that it is not affected even if fading occurs during standby in the “low consumption mode” (see FIG. 34). ). If the reception level detection unit 21 detects a signal level equal to or higher than the predetermined first threshold shown in FIG. 34 during operation in the “low consumption mode” (YES in # 59), the reception system is in the normal “diversity reception mode”. , And the operations after # 3 are executed.
  • FIG. 35 shows a configuration of a modified example of the antenna switching reception system according to the above embodiment.
  • the system of this modified example further includes a selected antenna storage unit 22 and a notification unit 23 with respect to the system shown in FIG.
  • the selected antenna storage unit 22 stores the antenna selected by the antenna control unit 10 when receiving the payload.
  • the notification unit 23 notifies the user (including the administrator of the reception system) of information related to the antenna using voice or light.
  • FIG. 36 shows the relationship between a packet received according to this modification and the antenna selected when the packet is received.
  • information related to the antenna (antenna A in FIG. 36) selected by the antenna control unit 10 when receiving the payload of the packet is stored in the selected antenna storage unit 22.
  • the notification unit 23 refers to the selected antenna storage unit 22 and notifies the user to that effect when any one of the antennas is selected continuously for a predetermined number of times or more. In the case shown in FIG. 36, notification that the antenna A is continuously selected is made. Further, the notification may be made that only one antenna is continuously selected without specifying the selected antenna.
  • FIG. 37 shows a configuration of a modified example of the antenna switching reception system according to the embodiment.
  • the system of this modification further includes a reception level notification unit 24 and a diversity on / off switching unit (switching function setting unit) 24, compared to the system shown in FIG.
  • the reception level notification unit 24 detects the level of the received radio signal and notifies the user using voice or light.
  • This notification may be performed as necessary, or may be performed in response to a request from the user.
  • Diversity on / off switching unit 24 2 is provided for the user to manually set the antenna switching function on (valid) / off (invalid).
  • the user can manually set the diversity, that is, the validity / invalidity of the antenna switching function by checking the notification output from the reception level notification unit 24 and operating the diversity on / off switching unit 2 2 as necessary.
  • FIG. 38 shows the operation of the antenna switching reception system according to this modification. First, the reception level notifying unit 24 detects the level of the received radio signal and notifies the user using voice or light (# 60).
  • FIG. 39 shows a configuration of a packet transmitted from a corresponding transmission system when the antenna switching function is enabled and disabled. When the antenna switching function is enabled, a unique word twice as many as the number of antennas and a pair of preambles are attached and transmitted.
  • the transmission function is added to the reception system, and the reception function is added to the corresponding transmission system, so that the transmission system can be notified and recognized of the validity / invalidity of the antenna switching function.
  • the reception level notification unit 24 since the reception level notification unit 24 is provided, the user can monitor the reception level from the outside of the reception system and can manually set the validity / invalidity of the antenna switching function. For this reason, for example, in a communication environment where the reception level is sufficiently high, the antenna switching function can be disabled and power consumption can be reduced.
  • the transmission system attaches a single preamble and unique word to each packet as shown in FIG. Just send it. Therefore, the number of buckets that can be transmitted per unit time is increased, and the transmission efficiency can be improved. This also shortens the reception time by the reception system, which can contribute to further lower power consumption of the reception system.
  • the notification that the antenna switching function is invalidated is realized by a configuration corresponding to, for example, a radio device 100 and a radio device 200 described later.
  • FIG. 40 shows a configuration of a modified example of the antenna switching reception system according to the embodiment.
  • the system according to this modification further includes a reception level detection unit 21 and a diversity on / off control unit (switching function control unit) 25 with respect to the system shown in FIG.
  • the reception level detection unit 21 detects the level of the radio signal received via any one of the antennas, similar to that shown in FIG.
  • the diversity on / off control unit 25 automatically disables the antenna switching function based on the reception level detected by the reception level detection unit 21. That is, when the reception level detection unit 21 detects a signal level that is sufficient to receive a radio signal without switching the antenna and is equal to or higher than a predetermined second threshold, the diversity on / off control unit 25 has an antenna switching function. Is automatically disabled.
  • FIG. 41 shows the operation of the antenna switching reception system according to this modification. While switching the antennas A and B at a predetermined period (# 1), a radio signal transmitted from the transmission system is received (# 2), and the reception level detection unit 21 detects the level of the received radio signal.
  • the transmission system When a signal level equal to or higher than the second threshold is detected (YES in # 62), the transmission system is notified that the antenna switching function is invalidated until the next packet is received (# 63). It is automatically disabled (# 64), and the next packet is received with the antenna fixed (# 65). As shown in FIG. 39, the transmission system that has received the notification transmits a single preamble and a unique word UW attached to each packet to increase transmission efficiency. On the other hand, when a signal level equal to or higher than the second threshold is not detected, the process proceeds to # 3 and after while the antenna switching function is maintained effectively. In the above description, only level detection is performed.
  • level detection may be performed after UW is detected or after it is determined that a signal is to be received, thereby improving the reliability during level detection.
  • the reception level detection unit 21 detects a signal level that is sufficient to receive a radio signal without switching the antenna
  • the diversity level on / off control unit 25 Disable the switching function automatically.
  • the corresponding transmission system may transmit a single preamble and a unique word UW attached to each packet. Therefore, transmission efficiency can be improved.
  • the switching function control unit enables the antenna switching function. You may comprise so that it may become. In this case, even when a change occurs in the communication environment due to an obstacle or a change in the layout of the transmission system or the reception system, the antenna switching function automatically returns to an effective state, so that it can be handled. Furthermore, when the payload is successfully received, it can be modified to transmit an ACK to that effect to the corresponding transmission system. In this case, if the transmission system cannot receive the ACK continuously for a predetermined time, it can know that the reception system has failed to receive the payload. At this time, as shown in FIG.
  • the transmission system when the transmission system shortens the data length by using a single preamble and unique word UW, it transmits a preamble and unique word UW twice the number of antennas. Switch.
  • the reception system can automatically and effectively function the antenna switching function, and the occurrence of a reception error due to deterioration of the reception level due to multipath fading can be restored again to an avoidable state. It becomes like this.
  • the transmission of ACK is realized by, for example, a configuration corresponding to a radio device 100 and a radio device 200 described later. (Modification) Further, in the modification example of the antenna switching reception system shown in FIG. 37 or FIG. 40, even when the antenna switching function is disabled, the antenna switching function is periodically switched to be enabled effectively. Also good.
  • the reception system performs reception by periodically enabling the antenna switching function every predetermined period, and otherwise, the receiving system is fixed to the antenna selected by the most recent antenna switching operation.
  • Receive In the figure, after fixing to one of the antennas in the packet 1, the antenna switching function is disabled and the antenna is fixed until the reception of the packet P is completed, and the antenna is received before receiving the preamble of the next packet P + 1. Enable the switching function. By repeating this operation, it is possible to reduce power consumption compared to the case where the antenna switching function is always used, and the antenna is periodically selected by periodic diversity communication. It becomes possible to follow.
  • FIG. 44 shows an outline of a wireless communication system constructed by applying the antenna switching reception system of the present invention.
  • FIG. 45 shows a relationship between an antenna switched by a radio device in which an antenna switching reception system is mounted and a signal received and transmitted by each antenna in a wireless communication system.
  • the wireless communication system includes a wireless device 100, a wireless device (wireless communication device) 200, and the like.
  • the radio device 100 is built in, for example, a monitor device.
  • the radio device 200 is built in, for example, a switchboard.
  • the antenna switching reception system of the present invention is mounted together with two antennas A and B.
  • the corresponding transmission system is wireless with one antenna It is mounted on the container 100. Since the wireless device 100 and the wireless device 200 perform bidirectional communication, a transmission system and a reception system are mounted, respectively.
  • Communication between the two is started by transmitting a wireless signal from the wireless device 100 to the wireless device 200, and the wireless signal is returned from the wireless device 200 to the wireless device 100.
  • the radio device 200 selects an antenna suitable for the communication environment by the switching diversity function using the two antennas A and B, and receives the payload of the radio signal.
  • the antenna selected at the time of reception of the immediately preceding (last) payload is used. For example, in FIG. 45, a radio signal is transmitted from the radio device 200 to the radio device 100 using the antenna A that was selected when the payload was received.
  • the radio device 100 that receives this radio signal is not provided with a diversity function.
  • the radio device 200 by effectively utilizing the diversity function provided in the radio device 200, a communication environment between the radio device 100 and the radio device 200 is obtained. It is possible to receive a high-quality wireless signal that matches the above.
  • an antenna that has received a larger number of packet payloads may be selected statistically during a past specific or unspecified period.
  • the antenna selected at the time of reception is used for the reply after receiving by making use of the diversity function provided in the radio device 200.
  • Diversity effects can be obtained. Further, when transmitting using the diversity function provided in the wireless device 200, it is necessary to transmit the number of times corresponding to the number of antennas. However, according to the construction example of this communication system, since the antenna to be used for transmission has already been determined, it is only necessary to transmit once using that antenna. Therefore, the transmission time can be shortened and the power consumption of the wireless device 200 can be reduced.
  • the present invention is not limited to the configuration of the above embodiment. It is only necessary to compare the quality of the received radio signal while switching the antenna at least at a predetermined cycle and select an antenna that receives the payload. The present invention can be variously modified.
  • the antenna switching reception system is not limited to the switchboard, and can be widely applied to various electrical appliances such as a lighting control switch having a wireless communication function.
  • the antenna switching reception system may be constructed by appropriately combining the configurations of the respective modifications.
  • the reception level comparison unit 14 shown in FIG. 14 is further provided to compare the radio signal level and the number of errors in the bit string, and fix the payload to the optimum antenna. You may comprise so that it may receive.
  • the reception level comparison unit 14 may be provided instead of the unique word error number comparison unit 15 to compare the radio signal levels, and fix the antenna to an optimum antenna to receive the payload.
  • FIG. 46 shows a schematic configuration of the antenna switching reception system.
  • the antenna switching reception system 110 includes an antenna unit 111 having two antennas, an antenna switching unit 112, an antenna switching timing detection unit 113, an antenna switching determination unit 114, and the like.
  • the antenna switching unit 112 switches from two antennas to one of the antennas.
  • the antenna switching timing detection unit 113 detects the timing at which the antenna switching unit 112 switches antennas, for example, by detecting a signal of a predetermined level or higher.
  • the antenna switching determination unit 114 selects the antenna that receives the payload signal based on the RSSI (Received Signal Strength) of the signal received by any one of the antennas via the antenna switching unit 112, and sends a control signal to that effect. Output to the antenna switching unit 112.
  • RSSI Receiveived Signal Strength
  • FIG. 47 shows signals received using two antennas, that is, antenna A and antenna B, in antenna switching reception system 110, and the operation of antenna switching reception system 110 when these signals are received. In particular, an example in which the antenna A is initially selected and the test 1 signal is received by the antenna A is shown.
  • FIG. 48 is a flowchart showing the operation of the antenna switching reception system 110 of FIG.
  • the signal shown in FIG. 47 is transmitted from a transmission system corresponding to the antenna switching reception system 110 of the present embodiment. At least a test 1 signal, a test 2 signal, and a payload signal are transmitted from the transmission system. One frame is composed of the test 1 signal, the test 2 signal, and the payload signal. A unique word signal (not shown) for frame synchronization is transmitted before the payload signal.
  • the test 1 signal and test 2 signal are used to select the antenna that receives the payload signal.
  • the test 1 signal is received by the initially selected antenna, and the test 2 signal is received by the switched antenna. This test signal is added as appropriate according to the number of antennas switched by the antenna switching unit 112.
  • the payload signal includes, for example, various data such as a header, video, audio, air temperature, a known signal sequence for the equalizer to estimate the multipath environment, or various control signals.
  • the operation of the antenna switching reception system 110 according to the second embodiment will be described with reference to FIGS.
  • the antenna switching receiving system 110 is initially waiting (# 101).
  • the antenna unit 111 of the antenna switching reception system 110 receives the signal (# 102) and the antenna switching timing detection unit 113 detects the antenna switching timing (YES in # 103), the antenna switching determination unit 114 detects the antenna A.
  • the reception level is detected (# 104).
  • the detection of the reception level is not limited to that based on RSSI, but may be based on the amplification factor when the received signal is amplified by the automatic gain control circuit.
  • the antenna switching determination unit 114 switches to the antenna B (# 105) and detects the reception level of the antenna B (# 106). The antenna switching is performed based on the antenna switching timing detected by the antenna switching timing detection unit 113. Thereafter, the antenna switching determination unit 114 compares the reception level of the antenna A with the reception level of the antenna B (# 107). When the reception level of antenna A is higher (YES in # 108), antenna switching determination unit 114 selects antenna A as an antenna for receiving the payload signal.
  • the antenna switching determination unit 114 outputs a control signal for switching to the antenna A to the antenna switching unit 112 (# 109), and receives a payload signal by the antenna A (# 110).
  • the example shown in FIG. 47 corresponds to this case.
  • antenna B is selected as the antenna for receiving the payload signal. That is, the antenna switching determination unit 114 receives the payload signal by the antenna B while being fixed to the antenna B (# 111).
  • the reception level of antenna A is the same as the reception level of antenna B, the payload signal is received by antenna B that last received the test signal (# 111).
  • the antenna selection may be made not by comparing the reception level but by indicating signal quality such as the number of bit errors.
  • this antenna switching reception system 110 before receiving the payload signal, the antenna that receives the test signal and receives the payload signal is selected by each antenna, and therefore the influence of level fluctuations due to multipath fading with a simple configuration Can be reduced. Thereby, even in a multipath environment, it is possible to avoid the occurrence of errors due to reception level deterioration due to multipath fading. Further, near real-time transmission can be realized by reducing the number of retransmissions. Further, when retransmission is unnecessary, it is possible to eliminate the retransmission function and contribute to cost reduction and size reduction. (Modification) FIG.
  • the transmission system transmits an antenna switching timing detection signal composed of a specific sequence of signal strings before the test 1 signal.
  • the antenna switching timing detection signal is a signal for detecting a reference timing for switching the antenna to be used to the antenna A or the antenna B when receiving the test 1 signal and the test 2 signal.
  • the antenna switching timing detection signal may be transmitted at a transmission rate lower than the transmission rate of the payload signal, and may include a bit synchronization preamble before that.
  • the correlation value calculation unit (storage unit) 115 stores a signal sequence (reference signal) in the same sequence as the antenna switching timing detection signal transmitted from the transmission system.
  • the signal sequence include a random signal such as 01100101011000101..., A bit sequence far from the sequence of fixed bit sequences in the payload, an M sequence having excellent correlation characteristics, and a similar signal sequence.
  • the correlation value calculation unit 115 calculates a correlation value between the stored signal sequence and the signal sequence of the received antenna switching timing detection signal. In this modification, the antenna switching timing detection signal is detected based on the correlation value calculated by the correlation value calculation unit 115.
  • FIG. 50 shows a signal received using the antenna A and the antenna B in the antenna switching reception system 110 of the present modification, and an operation of the antenna switching reception system 110 when receiving this signal.
  • FIG. 51 is a flowchart showing the operation of the antenna switching reception system 110 of this modification.
  • # 112 is executed instead of the process of # 103 shown in FIG.
  • An antenna switching timing detection signal, a test 1 signal, a test 2 signal, and a payload signal are transmitted from the transmission system.
  • the antenna switching timing detection signal is transmitted at a lower transmission rate than other signals.
  • a signal received via any one of the antennas is compared with a reference signal stored by the correlation value calculation unit 115 while shifting by one sample (1 bit in this modification), and the degree of coincidence is sequentially digitized.
  • a correlation value is calculated. If the degree of coincidence is equal to or greater than a predetermined threshold, it is determined that an antenna switching timing detection signal has been detected (YES in # 112), and antenna switching determination unit 114 detects the reception level of antenna A (# 104).
  • the subsequent processing is the same as that shown in FIG. According to this antenna switching reception system 110, the antenna switching timing is detected by correlation value detection, so that the antenna switching timing detection signal and the noise can be more clearly distinguished, and the resistance to noise is enhanced. Is possible.
  • antenna switching can be determined at any location simply by inserting the signal sequence of the antenna switching timing detection signal at the location where antenna switching is desired, the degree of freedom in frame configuration can be increased.
  • the antenna switching timing detection signal transmitted at a lower transmission rate than the payload signal is received, the influence of intersymbol interference due to multipath is avoided and the signal energy per bit increases. High sensitivity. Therefore, even when an antenna affected by reception level deterioration caused by communication environment deterioration such as multipath fading is selected, the antenna switching timing detection signal can be detected without fail. Therefore, even when an antenna affected by reception level deterioration due to deterioration of the communication environment such as multipath fading is selected, an antenna for receiving a payload signal can be selected accurately. .
  • FIG. 52A shows an example of a signal (modulated signal) transmitted as an antenna switching timing detection signal of still another modified example of the antenna switching reception system 110.
  • FIG. 52B shows an example of a demodulated signal whose level is adjusted, and
  • FIG. 52C shows an example of a demodulated signal in a saturated state where level adjustment is not performed.
  • Signals received and demodulated via the antenna unit 111 and the antenna switching unit 112 are level-adjusted by an automatic gain control unit (not shown) and then input to the correlation value calculation unit 115.
  • an automatic gain control unit (not shown)
  • the demodulated signal level after gain control by the automatic gain control unit may be small as shown in FIG.
  • the present modification is configured such that, for example, the transmission signal is a binary signal such as BPSK, thereby eliminating the need for gain control and allowing demodulation and detection even in a saturated state.
  • the transmission signal is a binary signal such as BPSK
  • FIG. 53 shows a schematic configuration of still another modified example of the antenna switching reception system 110 of the second embodiment.
  • This antenna switching reception system 110 is configured by adding a counter unit 116 to the antenna switching reception system 110 of FIG.
  • the counter unit 116 counts the time from a specific antenna switching reference timing to the next antenna switching reference timing.
  • the next antenna switching timing reference is detected based on the count value of the counter unit 116.
  • 54 and 55 illustrate signals (frames) received using the antenna A and the antenna B and the operation of the counter unit 116 in the antenna switching reception system 110 according to the present modification.
  • FIG. 54 shows a case where a frame is received at a constant cycle without an error
  • FIG. 55 shows a case where a frame is not received at a constant cycle with an error.
  • FIG. 56 is a flowchart showing an operation (particularly, an operation corresponding to FIG. 55) of the antenna switching reception system 110 of the present modification.
  • # 113, # 113-1, # 114, and # 114-1 are executed in place of the process of # 103 shown in FIG.
  • the counter unit 116 starts counting from when the antenna switching timing detection unit 113 first detects an antenna switching timing detection signal. And it counts to the count value N corresponding to the timing used as the reference
  • the start of counting by the counter unit 116 may be a timing determined within each frame, or may be a timing at which synchronization is established by detection of a unique word signal for frame synchronization after the test 2 signal. . In FIG.
  • the timing at which the antenna switching timing detection unit 113 detects the antenna switching timing detection signal in the next frame matches the timing at which the counter unit 116 counts the count value N. Can be made. Therefore, when the counter unit 116 counts the count value N, it can be considered that the antenna switching timing detection signal has been detected. This eliminates the need for the antenna switching timing detection signal from the next frame onward, thereby improving the transmission efficiency of the payload signal.
  • the operation in FIG. 54 corresponds to the operation in which the process of # 114 in FIG. 56 is omitted and the process proceeds to # 104. On the other hand, in FIG.
  • the antenna switching timing detection unit 113 detects an antenna switching timing detection signal in the next frame while the counter unit 116 uses the count value as an auxiliary. . That is, a timing that is an approximate reference for antenna switching is detected based on the count value of the counter unit 116, and the antenna switching timing detection unit 113 is operated for a predetermined time before and after that. 55 and 56, for example, after the counter unit 116 has counted up to N-4 (YES in # 113), the antenna switching timing detection unit 113 is operated for a predetermined time, and the antenna switching timing detection signal is detected. Is detected (# 114).
  • the detection accuracy of the antenna switching timing detection signal can be improved by supplementarily using the count value of the counter unit 116.
  • the antenna switching timing detection signal associated with the calculation of the correlation value is compared with the case where the antenna switching timing detection signal is always detected. The probability of erroneous detection due to noise or the like can be reduced. If the antenna switching timing detection signal can be detected in # 114 (YES in # 114), the count value of the counter unit 116 is reset (# 114-1) and the process proceeds to # 104. If NO (NO in # 114), the process returns to # 101. (Modification) FIG.
  • FIG. 57 shows a schematic configuration of still another modified example of the antenna switching reception system 110 of the second embodiment.
  • This antenna switching reception system 110 is configured by adding an antenna periodic switching control unit 117 to the antenna switching reception system 110 of FIG.
  • the antenna periodic switching control unit 117 switches the antennas every predetermined period having a period equal to or longer than the length of the antenna switching timing detection signal. Accordingly, the antenna switching timing detection signal is transmitted over a plurality of times at least twice the number of antennas in one frame.
  • FIG. 58 shows a signal received using the antenna A and the antenna B in the antenna switching reception system 110 of this modification, and an operation of the antenna switching reception system 110 when receiving this signal. In particular, a case is shown in which the antenna is switched every cycle that is twice the length of the antenna switching timing detection signal.
  • the frame transmitted from the transmission system includes antenna switching timing detection signals 1 to 4.
  • the antenna switching timing detection signals 1 to 4 are configured by different specific signal sequences. Since the antenna switching reception system 110 switches antennas regardless of the timing at which frames are transmitted from the transmission system, various patterns can be considered as to which signal is received by which antenna. For example, the antenna switching timing detection signal is received at the reception timing of the three patterns shown in FIG. In the reception timing example 1, when the antenna switching timing detection signal 1 cannot be detected due to degradation of the reception level or noise, the antenna switching timing detection signal 2 is continuously received.
  • the antenna switching timing detection signal 2 is not detected.
  • the antenna is switched at a cycle that is twice the length of the antenna switching timing detection signal, so that the antenna is not switched during reception of the next antenna switching timing detection signal 3. Therefore, the antenna switching timing detection signal 3 can be detected by the antenna B.
  • the antenna switching timing detection signal 1 is not detected because the antenna A is switched to the antenna B during reception of the antenna switching timing detection signal 1.
  • the antenna switching timing detection signal 2 cannot be detected during reception of the antenna switching timing detection signal 2 due to reception level deterioration or noise, the antenna switching timing detection signal 3 is continuously received.
  • the antenna switching timing detection signal 3 is not detected.
  • the antenna is switched at a cycle that is twice the length of the antenna switching timing detection signal, so that the antenna is not switched during reception of the next antenna switching timing detection signal 4. Therefore, the antenna switching timing detection signal 4 can be detected by the antenna A.
  • Reception timing example 3 shows a case where the timing for starting reception of the antenna switching timing detection signal matches the timing for switching the antenna. In this case, when the antenna switching timing detection signals 1 and 2 cannot be detected by the antenna B due to reception level degradation, noise, or the like, the antenna switching timing detection signal 3 is detected by switching to the antenna A.
  • the antenna periodic switching control unit 117 periodically switches the antenna (# 115), and the antenna switching timing detection unit 113 detects the antenna switching timing detection signal (in # 116). YES). Since the antenna switching timing detection signals are composed of different specific signal sequences, the antenna switching timing detection unit 113 specifies which antenna switching timing detection signal the detected antenna switching timing detection signal is. it can. Then, the periodic antenna switching control unit 117 counts the time until the test 1 signal is received according to the antenna switching timing detection signal detected by the antenna switching timing detection unit 113 (# 117). For example, in the case of the reception timing examples 1 and 3 in FIG. 58, the antenna regular switching control unit 117 counts the time corresponding to the antenna switching timing detection signal 4.
  • the antenna switching timing detection signal 1 If the antenna switching timing detection signal 1 is detected, the time corresponding to the antenna switching timing detection signals 2 to 4 is counted. Since it is sufficient that one of the antenna switching timing detection signals is detected, the antenna switching timing detection function by the antenna switching timing detection unit 113 is stopped during the counting by the antenna periodic switching control unit 117. (# 118). Thereafter, when the count by the antenna periodic switching control unit 117 is completed, the process proceeds to # 104. Since it is the same as that of FIG. 48 after this, description is abbreviate
  • this antenna switching reception system 110 a signal for antenna switching timing detection is received a plurality of times, and the antenna switching timing can be detected by any of the antennas by switching the antennas at predetermined intervals.
  • FIG. 60 shows a schematic configuration of still another modified example of the antenna switching reception system 110 of the second embodiment.
  • This antenna switching reception system 110 is configured by adding an antenna switching timing detection on / off control unit (antenna switching timing detection on / off control unit) 118 to the antenna switching reception system 110 of FIG.
  • the antenna switching timing detection on / off control unit 118 controls the antenna switching timing detection unit 113 not to detect the antenna switching timing detection signal for a predetermined period after detecting the antenna switching timing detection signal.
  • FIG. 61 shows a signal received using the antenna A and the antenna B in the antenna switching reception system 110 of the present modification, and an operation of the antenna switching reception system 110 when receiving this signal.
  • FIG. 62 is a flowchart showing the operation of the antenna switching reception system 110 of this modification.
  • # 119 between the processes of # 102 and # 103 shown in FIG. 48
  • # 120 between the processes of # 103 and # 104
  • # 121 after the processes of # 110 and # 111
  • the process of # 122 is executed.
  • the antenna unit 111 receives a signal (# 102)
  • the signal output from the antenna switching timing detection on / off control unit 118 is on (YES in # 119)
  • the process proceeds to # 103.
  • antenna switching timing detector 113 detects the antenna switching timing (YES in # 103)
  • the signal output from antenna switching timing detection on / off controller 118 is turned off (# 120).
  • the antenna switching timing detection function is turned off.
  • the processes of # 104 to # 110 or # 111 are executed in the same manner as in FIG. 48, and the payload signal is received by one of the antennas (YES in # 121), and then output from the antenna switching timing detection on / off control unit 118.
  • the process returns to # 101. If the signal output from the antenna switching timing detection on / off control unit 118 is not on (NO in # 119), the process returns to # 101.
  • this antenna switching reception system 110 After the antenna switching timing is detected, the antenna switching timing is not detected during a predetermined period including the reception time of the payload signal. As a result, it is possible to suppress erroneous detection of the antenna switching timing with respect to a payload signal or noise that becomes a random signal. Therefore, it is possible to prevent an error associated with switching the antenna during reception of the payload signal (because a physical switching time is required for switching the antenna and the payload cannot be received during that time). In addition, when only one of the antennas can be received, it is possible to prevent occurrence of a reception error due to unnecessary antenna switching.
  • a predetermined period during which the antenna switching timing is not detected a period from when the reception of the payload signal of the current frame is completed to immediately before the reception of the antenna switching timing detection signal of the next frame may be set. In this case, erroneous detection of the antenna switching timing with respect to noise after the completion of reception of the payload signal of the current frame can also be suppressed.
  • the detection function of the antenna switching timing detection signal is stopped for a predetermined period.
  • the antenna switching timing detection signal may not be detected for a predetermined period when a unique word signal transmitted thereafter is detected.
  • the unique word signal is transmitted following the antenna switching timing detection signal, the test 1 signal, and the test 2 signal, for example (see FIG. 46). If a unique word can be detected after detecting the antenna switching timing detection signal, it can be determined that the previously detected antenna switching timing detection signal is correct.
  • FIG. 63 shows a schematic configuration of still another modified example of the antenna switching reception system 110 of the second embodiment.
  • This antenna switching reception system 110 is configured by adding a non-detection time counter unit 120 to the antenna switching reception system 110 of FIG.
  • the non-detection time counter unit 120 counts the time during which no antenna switching timing detection signal is detected.
  • FIG. 64 shows a signal received using the antenna A and the antenna B in the antenna switching reception system 110 of this modification, and an operation of the antenna switching reception system 110 when receiving this signal.
  • FIG. 65 is a flowchart showing the operation of the antenna switching reception system 110 of this modification. In this modified example, when NO in # 112 shown in FIG. 51, the processes of # 125 to # 128 are executed. In this modification, as shown in FIG. 65, when the antenna switching timing detection signal that should be received by the antenna A cannot be received over the frames 1 and 2 (NO in # 112), the following operation is performed. Do.
  • the non-detection time counter unit 120 starts counting (# 126) and returns to # 101. If the non-detection time counter unit 120 is counting (YES in # 125) and the count value of the non-detection time counter unit 120 is not the specified value or more (NO in # 127), the process returns to # 101. If the count value of the non-detection time counter unit 120 is equal to or greater than the specified value (YES in # 127), the count is stopped and switched to another antenna B assuming that a predetermined time has elapsed (# 128).
  • the predetermined time means a time sufficient to detect the antenna switching timing signal at least once if the antenna and the communication environment are normal.
  • the specified value is set so as to be longer than the time required for communication of frame 1 and frame 2.
  • This antenna switching reception system 110 is configured by adding a second correlation value calculation unit 122 and a second correlation value calculation unit 123 to the antenna switching reception system 110 of FIG.
  • a test signal composed of a signal sequence in a specific sequence different from the antenna switching timing detection signal is transmitted from the transmission system.
  • the second correlation value calculation unit (storage unit) 122 stores a signal sequence (reference signal) in the same sequence as the transmitted test 1 signal.
  • the second correlation value calculation unit 122 detects the test 1 signal based on the correlation value by calculating the correlation value between the stored signal sequence and the signal sequence of the received test 1 signal.
  • the second correlation value calculation unit (storage unit) 123 stores a signal sequence (reference signal) in the same sequence as the transmitted test 2 signal.
  • the second correlation value calculation unit 123 detects the test 2 signal based on the correlation value by calculating the correlation value between the stored signal sequence and the signal sequence of the received test 2 signal.
  • the frame can be detected by detecting the test 1 signal or the test 2 signal.
  • the payload signal can be received.
  • FIG. 67 shows a signal received using the antenna A and the antenna B in the antenna switching reception system 110 of this modification, and the operation of the antenna switching reception system 110 when receiving this signal.
  • FIG. 68 is a flowchart showing the operation of the antenna switching reception system 110 of this modification. In the present modification, when NO at # 112 shown in FIG.
  • the processing after # 104 that is, the antenna that receives the payload signal is determined by comparing the reception level detected by each antenna while switching the antenna.
  • the correlation value calculation unit 115 detects the antenna switching timing detection signal
  • the correlation detection by the second correlation value calculation unit 122 using the test 1 signal is not performed or is invalid even if performed.
  • the second correlation value calculation units 122 and 123 are operated again in preparation for reception of the next frame.
  • correlation value calculation unit 115 cannot detect the antenna switching timing (NO in # 112), if test 1 signal is detected by second correlation value calculation unit 122 (YES in # 131), current antenna A A payload signal is received (# 110).
  • the test 1 signal is not detected by the second correlation value calculator 122 (NO in # 131)
  • the test 2 signal is detected by the second correlation value calculator 123 (YES in # 132)
  • the current The payload signal is received by the antenna A (# 110).
  • the second correlation value calculation unit 123 does not detect the test 2 signal within the predetermined time (NO in # 132)
  • the process returns to # 101.
  • the second correlation value calculation unit 122 detects the test 1 signal, the antenna switching operation is not performed, and another process can be performed during the time during which the test 2 signal is transmitted. For example, when the payload signal is not binary and the reception level needs to be adjusted, it can be assigned to the gain adjustment time of automatic gain control.
  • the second correlation value calculation unit 123 detects the test 2 signal, the antenna switching operation is not executed and the payload signal is received with the current automatic gain control value.
  • the second correlation value calculation unit 122 or the second correlation value calculation unit 123 detects the test 1 signal or the test 2 signal. Therefore, it is possible to detect the head of the payload signal in two or three stages. As a result, even when noise or an instantaneous level drop occurs during reception of the antenna switching timing detection signal, the head of the payload signal can be detected by the test 1 signal or the test 2 signal. The probability of losing the payload signal can be reduced.
  • the second correlation value calculation unit for detecting the test signal can be further added according to the number of test signals to be transmitted (that is, the number of antennas).
  • the present invention is not limited to the configuration of the above-described embodiment, and at least before receiving a payload signal, the antenna may be configured to receive a test signal with a plurality of antennas and select an antenna that receives the payload signal. That's fine.
  • the antenna switching reception system which combined the characteristic of each embodiment mentioned above suitably may be sufficient.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)

Abstract

L'invention concerne un système de réception à commutation d'antennes conçu pour commuter une pluralité d'antennes et reçoit un signal sans fil. Dans le système de réception à commutation d'antennes, la qualité du signal sans fil reçu pendant la commutation d'antenne à un cycle prédéterminé est comparée, puis l'antenne qui reçoit les données utiles est sélectionnée.
PCT/IB2011/001937 2010-08-26 2011-08-25 Système de réception à commutation d'antennes et dispositif de communication sans fil comprenant un tel système WO2012028917A1 (fr)

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CN201180041431.7A CN103069727B (zh) 2010-08-26 2011-08-25 天线切换接收系统以及具备该系统的无线通信器

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JP2010190074A JP5658946B2 (ja) 2010-08-26 2010-08-26 アンテナ切替受信システム
JP2010-190074 2010-08-26
JP2011-094476 2011-04-20
JP2011094476 2011-04-20
JP2011150867A JP5747177B2 (ja) 2011-04-20 2011-07-07 アンテナ切り替え受信システム及びそれを備えた無線通信器
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CN103780297A (zh) * 2012-10-19 2014-05-07 松下电器产业株式会社 天线切换通信系统
JP2014086785A (ja) * 2012-10-19 2014-05-12 Panasonic Corp アンテナ切り替え受信システム及びそれに対応する送信システム
JP2014086767A (ja) * 2012-10-19 2014-05-12 Panasonic Corp アンテナ切り替え受信システム及びそれに対応する送信システム
JP2014135635A (ja) * 2013-01-10 2014-07-24 Panasonic Corp アンテナ切り替え受信システム及びそれに対応する送信システム
JP2014135636A (ja) * 2013-01-10 2014-07-24 Panasonic Corp アンテナ切り替え受信システム及びそれに対応する送信システム
CN103780297B (zh) * 2012-10-19 2018-08-31 松下知识产权经营株式会社 天线切换通信系统
CN111711919A (zh) * 2020-05-26 2020-09-25 桃芯科技(苏州)有限公司 用于控制天线定时切换的方法、电子设备和计算机存储介质

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TWI504918B (zh) * 2013-12-31 2015-10-21 Univ Nat Changhua Education 可定位分布式天線系統及運作方法

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JP2007088860A (ja) * 2005-09-22 2007-04-05 Olympus Corp 受信装置
JP2010171846A (ja) * 2009-01-26 2010-08-05 Panasonic Electric Works Co Ltd ダイバーシチ通信システム及びダイバーシチ受信装置

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JP2007088860A (ja) * 2005-09-22 2007-04-05 Olympus Corp 受信装置
JP2010171846A (ja) * 2009-01-26 2010-08-05 Panasonic Electric Works Co Ltd ダイバーシチ通信システム及びダイバーシチ受信装置

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103780297A (zh) * 2012-10-19 2014-05-07 松下电器产业株式会社 天线切换通信系统
JP2014086785A (ja) * 2012-10-19 2014-05-12 Panasonic Corp アンテナ切り替え受信システム及びそれに対応する送信システム
JP2014086766A (ja) * 2012-10-19 2014-05-12 Panasonic Corp アンテナ切り替え通信システム
JP2014086767A (ja) * 2012-10-19 2014-05-12 Panasonic Corp アンテナ切り替え受信システム及びそれに対応する送信システム
CN103780298B (zh) * 2012-10-19 2017-08-08 松下知识产权经营株式会社 天线切换接收系统以及与其对应的发送系统
CN103780297B (zh) * 2012-10-19 2018-08-31 松下知识产权经营株式会社 天线切换通信系统
JP2014135635A (ja) * 2013-01-10 2014-07-24 Panasonic Corp アンテナ切り替え受信システム及びそれに対応する送信システム
JP2014135636A (ja) * 2013-01-10 2014-07-24 Panasonic Corp アンテナ切り替え受信システム及びそれに対応する送信システム
CN111711919A (zh) * 2020-05-26 2020-09-25 桃芯科技(苏州)有限公司 用于控制天线定时切换的方法、电子设备和计算机存储介质

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