JP2016171362A - Receiving device and receiving method - Google Patents

Receiving device and receiving method Download PDF

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Publication number
JP2016171362A
JP2016171362A JP2015047942A JP2015047942A JP2016171362A JP 2016171362 A JP2016171362 A JP 2016171362A JP 2015047942 A JP2015047942 A JP 2015047942A JP 2015047942 A JP2015047942 A JP 2015047942A JP 2016171362 A JP2016171362 A JP 2016171362A
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antennas
plurality
reception
beam width
control
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JP2015047942A
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Japanese (ja)
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悠希 酒井
Yuki Sakai
悠希 酒井
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日本電気株式会社
Nec Corp
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Abstract

The present invention provides a receiving device and a receiving method that are suitable for communication using tropospheric scatter propagation and non-line-of-sight communication and that can be miniaturized. A receiving apparatus according to the present invention is a receiving apparatus that performs diversity reception using received signals from a plurality of antennas. The receiving apparatus monitors the plurality of antennas and the received signals from the plurality of antennas, and obtains a monitoring result. And a controller for controlling the elevation angle and beam width of the plurality of antennas. [Selection] Figure 1

Description

  The present invention relates to a receiving apparatus and a receiving method, and more particularly, to a receiving apparatus and a receiving method suitable for communication using tropospheric scatter propagation and non-line-of-sight communication.

  In wireless communication having a fading transmission path, a diversity reception method is used. In a multipath fading channel that requires a diversity scheme, interference wave elimination and multipath distortion adaptive equalization are performed. As shown in FIG. 4, the receiving apparatus of Patent Document 1 includes an antenna group 21, bandpass filters 22a and 22b, low noise amplifiers 23a and 23b, down converters 24a and 24b, automatic gain controllers 25a and 25b, and adaptation. Matching filters 26a and 26b, a synthesis circuit 27, and an automatic equalization circuit 28 are included.

  The antenna group 21 includes two horn antennas 21a and 21b. The receiving apparatus in FIG. 4 receives the reception signals from the horn antennas 21a and 21b as two branches (reception systems). 4 receives the received signal from the horn antenna 21a through the band-pass filter 22a, the low noise amplifier 22a, the down converter 24a, the automatic gain controller 25a, and the adaptive matched filter 26a. 4 receives the received signal from the horn antenna 21b through the band-pass filter 22b, the low noise amplifier 22b, the down converter 24b, the automatic gain controller 25b, and the adaptive matched filter 26b.

  The synthesis circuit 27 performs diversity synthesis of the signals input from the adaptive matched filters 26a and 26b. The automatic equalization circuit 28 performs automatic equalization on the diversity combined signal and reproduces the received signal.

International Publication No. 2013/145663

  For communication using tropospheric scatter propagation, it is necessary to design a system that takes into account the antenna level loss due to antenna coupling loss and long-period fading. Since antenna coupling loss and long-period fading occur, a large-diameter antenna, a large power amplifier, a diversity receiver, and the like are required so that communication is not interrupted even when the reception input level is lowered. As a result, the system scale has increased.

  An object of the present invention is to provide a receiving apparatus and a receiving method that are suitable for communication using tropospheric scatter propagation and non-line-of-sight communication and that can be miniaturized.

To achieve the above object, a receiving apparatus according to the present invention is a receiving apparatus that performs diversity reception using a plurality of antenna reception signals,
A plurality of antennas; and a control unit that monitors reception signals from the plurality of antennas and controls elevation angles and beam widths of the plurality of antennas according to a monitoring result.

A reception method according to the present invention is a reception method for performing diversity reception using reception signals of a plurality of antennas,
The reception signals from the plurality of antennas are monitored, and the elevation angle and beam width of the plurality of antennas are controlled according to the monitoring result.

  Since the present invention corrects the antenna coupling loss so that communication is not interrupted even when the reception input level is lowered, the system scale can be reduced.

It is a block diagram for demonstrating the receiver by embodiment of the highest concept of this invention. It is a block diagram for demonstrating the receiver by one Embodiment of this invention. It is a general-view figure for demonstrating transmission / reception by a tropospheric scatter propagation system. 10 is a block diagram of a receiving device of Patent Literature 1. FIG.

  Preferred embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram for explaining a receiving apparatus according to an embodiment of the highest concept of the present invention. The receiving apparatus in FIG. 1 is a dual diversity receiving apparatus provided with antennas 3a and 3b, and performs diversity reception using received signals from the antennas 3a and 3b.

  The receiving apparatus in FIG. 1 includes antennas 3a and 3b, adaptive matched filters 9a and 9b, a synthesis circuit 10, a decision feedback equalizer 11, and a control unit 12. The adaptive matched filters 9a and 9b synthesize multipath energy. The combining circuit 10 performs diversity combining. The decision feedback equalizer 11 removes intersymbol interference.

  The control unit 12 monitors received signals from the antennas 3a and 3b, and controls the driving units 4a and 4b of the antennas 3a and 3b according to the monitoring result. By this driving, the elevation angle and beam width of the antennas 3a and 3b are controlled. For example, when the reception input level of the reception signal from the antennas 3a and 3b is lowered, the control unit 12 controls the drive units 4a and 4b so as to widen the beam width of the antennas 3a and 3b. Further, the control unit 12 controls the driving units 4a and 4b so as to narrow the beam width of the antennas 3a and 3b when the reception input level of the reception signals from the antennas 3a and 3b increases.

  According to the receiving apparatus of FIG. 1, since the antenna coupling loss is corrected so that communication is not interrupted even when the reception input levels of the antennas 3a and 3b are lowered, the system scale can be reduced. Hereinafter, preferred embodiments of the present invention will be described in more detail.

[Preferred embodiment]
A receiving apparatus and a receiving method according to an embodiment of the present invention will be described. FIG. 2 is a block diagram for explaining a receiving apparatus according to an embodiment of the present invention. FIG. 3 is an overview diagram for explaining transmission and reception by the tropospheric scatter propagation method.

(Configuration of the embodiment)
The receiving apparatus in FIG. 2 is a dual diversity receiving apparatus including the antennas 3a and 3b, and performs diversity reception using the reception signals of the antennas 3a and 3b. The receiving apparatus of this embodiment includes BPFs (Band Pass Filters) 5a and 5b, LNAs (Low Noise Amplifiers) 6a and 6b, and D / Cs (Down Converters) 7a. And 7b. Furthermore, the receiving apparatus of this embodiment includes AGC (Automatic Gain Controller) 8a and 8b, AMF (Adaptive Matched Filter) 9a and 9b, a synthesis circuit 10, and DFE (Decision Feedback Equalizer). A feedback equalizer 11.

  Furthermore, the receiving apparatus of the present embodiment includes a CONT (Controller) 12 that controls the driving units 4a and 4b of the antennas 3a and 3b based on the outputs of the AGCs 8a and 8b, that is, the received input level value after AGC.

  The BPFs 5a and 5b limit the band of the signals received by the antennas 3a and 3b. The LNAs 6a and 6b amplify the outputs from the BPFs 5a and 5b. The D / Cs 7a and 7b perform frequency conversion on the outputs of the LNAs 6a and 6b. The AGCs 8a and 8b control the reception input level for the outputs of the D / Cs 7a and 7b. The AMFs 9a and 9b reduce unnecessary signals included in the reception signals of the respective branches. The combining circuit 10 performs diversity combining of the signals input from the AMFs 9a and 9b. The DFE 11 performs automatic equalization on the diversity combined signal and reproduces the received signal while removing intersymbol interference.

  Then, the CONT 12 of this embodiment calculates the RMS (Root mean square) of the received input level, compares it with a threshold value, and performs drive control of the drive units 4a and 4b of the antennas 3a and 3b. For example, the RMS of the received input level is calculated and compared with a threshold value, and drive control of the antennas 3a and 3b is performed based on the comparison result.

  For example, when the RMS of the reception input level decreases, control is performed so that the beam widths of the antennas 3a and 3b are expanded. When the RMS of the reception input level increases, the beam widths of the antennas 3a and 3b are decreased. To control. When the beam width of the antenna is widened, the antenna gain generally decreases. Therefore, a calculation process of tradeoff between coupling loss and gain is also performed and reflected in the drive control.

  When the antennas 3a and 3b are parabolic antennas, the beam width can be controlled by driving the antenna horn back and forth. Here, there is a possibility that the focal length is changed by driving the horn of the antenna and the gain is lowered. Therefore, in the control by the CONT 12, the antenna coupling loss is corrected in consideration of the gain reduction. In the case of a parabolic antenna, the elevation angle drives the parabolic antenna itself vertically.

  When the antennas 3a and 3b are phased array antennas, the elevation angle and the beam width can be controlled.

(Operation of the embodiment)
The operation of the receiving apparatus and the receiving method of this embodiment will be described more specifically. FIG. 3 shows an overview of transmission and reception using tropospheric scatter propagation. The transmitting station 100 performs non-line-of-sight communication with the receiving station 200. The transmission beam transmitted from the transmission station 100 is scattered in the troposphere. The scattering region 300 is called a scattering volume and has a spatial spread, and the receiving station 200 receives a beam refracted in the scattering region.

  Usually, in the line-of-sight communication, the plane of the antenna faces each other, but in the case of non-line-of-sight communication, which is not directly facing, the loss is affected by the size of the scattering region. This is called antenna coupling loss. The antenna coupling loss varies depending on the beam width and elevation angle of the transmitting / receiving antenna and the weather conditions.

Antenna coupling loss L c is expressed by the following equation.

here,
L ch : horizontal coupling loss, L cv : vertical coupling loss θ = α + β, θ: scattering angle θ tm , θ rm : optimal elevation angle φ th , φ rh : transmission / reception antenna horizontal plane beam width (α th , α rh ) x 0.6
φ tv , φ rv : Transmitting / receiving antenna vertical beam width (α tv , α rv ) × 0.6
K1: Weather constant.

When the air in the troposphere convects and the refractive index of the radio wave changes due to changes in temperature, humidity, and pressure, the weather constant K1 and the optimum elevation angle θ tm , θ rm in the above equation for the antenna coupling loss change. In addition, the situation of scatter propagation in the troposphere changes greatly, long-period fading that varies by 10 to 20 dB throughout the year occurs, and the reception level decreases.

  The receiving station 200 performs arithmetic processing from the received input level, and adaptively controls the elevation angle and beam width of the antenna. This corrects the antenna coupling loss and avoids a level drop due to long-period fading.

  The received input level changes every second due to short-period fading. For this reason, RMS and the like are calculated every second, and the calculated value is compared with a threshold value. When the RMS of the received input level is lower than the threshold value, the elevation angles of the antennas 3a and 3b are UP / DOWN controlled from the driving units 4a and 4b, and the calculated values are controlled to be higher than the threshold value. In addition, the beam width is subjected to Wide / Narrow control from the driving units 4a and 4b simultaneously or in parallel so as to increase the calculated value.

  Alternatively, the following control can be considered. In other words, if the calculated value using the received input level increases, the risk of line disconnection is reduced, so control is not performed, or UP / DOWN control of the elevation angle and beam width so that the calculated value increases further. Perform Wide / Narrow control. When the calculated value using the received input level decreases and falls below the threshold, the up / down control of the elevation angle and the wide / narrow control of the beam width are performed so that the calculated value increases because the risk of line disconnection increases.

(Effect of embodiment)
According to the receiving apparatus of the present embodiment, it is possible to avoid a decrease in the received input level due to long-period fading by correcting the antenna coupling loss.

  As a result, the scale of the receiving station to which the receiving apparatus of the present embodiment is applied can be reduced, and the price can be greatly reduced. For example, assume that there is a receiving station that requires an antenna diameter of 19 m in terms of circuit design. If the level reduction can be improved by 6 dB by the loss correction of the receiving apparatus according to the present embodiment, it is possible to construct a line with a 10 m antenna. If the antenna diameter is constant, the amplifier can be reduced from 2kW to 0.5kW. As described above, according to the receiving apparatus of the present embodiment, the size of the receiving station can be reduced and the price can be significantly reduced.

[Extended embodiment]
As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to this. For example, the dual diversity receiving device has been described in the receiving device of the above-described embodiment. However, the present invention is not limited to this, and can also be applied to quadruple, hexafold, and octal diversity receivers. It is also conceivable to configure such that the elevation angle and beam width of the antenna on the transmitting station side are controlled by sending a control signal from the receiving station to the transmitting station. The present invention is not limited to a receiving device in which the antenna is a horn antenna, but can also be realized in a receiving device in which the antenna is a phased array antenna, and a receiving station using this. It goes without saying that various modifications are possible within the scope of the invention described in the claims, and these are also included in the scope of the present invention.

A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.
(Supplementary Note 1) A receiving apparatus that performs diversity reception using a plurality of antenna reception signals,
A receiving apparatus, comprising: the plurality of antennas; and a control unit that monitors reception signals from the plurality of antennas and controls elevation angles and beam widths of the plurality of antennas according to a monitoring result.
(Additional remark 2) The said control part is a receiver of Additional remark 1 which controls so that the beam width of these antennas may be expanded, when the receiving input level of the received signal from these antennas falls.
(Supplementary note 3) The reception according to Supplementary note 1 or Supplementary note 2, wherein the control unit performs control so as to narrow a beam width of the plurality of antennas when a reception input level of a reception signal from the plurality of antennas increases. apparatus.
(Supplementary note 4) The control unit according to Supplementary note 1 or Supplementary note 2, wherein when the reception input level of the reception signals from the plurality of antennas increases, the control unit does not change the beam width of the plurality of antennas. Receiver device.
(Additional remark 5) The said control part calculates RMS (Root mean square) of the reception input level of the received signal from these aerials, and performs control with respect to the said beam width by comparing this calculation result with a threshold value, The receiving device according to any one of appendix 2 to appendix 4.
(Supplementary note 6) The adaptive matching filter that synthesizes multipath energy, a synthesis circuit that performs diversity synthesis, and an equalizer that eliminates intersymbol interference, and further includes an equalizer that eliminates intersymbol interference. Receiver device.
(Supplementary note 7) A reception method for performing diversity reception using a plurality of antenna reception signals,
A reception method of monitoring received signals from the plurality of antennas and controlling elevation angles and beam widths of the plurality of antennas according to a monitoring result.
(Supplementary note 8) The reception method according to supplementary note 7, wherein when a reception input level of a reception signal from the plurality of antennas decreases, control is performed so as to widen a beam width of the plurality of antennas.
(Supplementary note 9) The reception method according to supplementary note 7 or supplementary note 8, wherein when a reception input level of a reception signal from the plurality of antennas increases, control is performed so as to narrow a beam width of the plurality of antennas.
(Supplementary note 10) The reception method according to supplementary note 7 or supplementary note 8, wherein when a reception input level of a reception signal from the plurality of antennas is increased, no beam width of the plurality of antennas is changed.
(Additional remark 11) The RMS (Root mean square) of the reception input level of the received signal from the plurality of antennas is calculated, and the calculation result is compared with a threshold value to control the beam width. Additional remarks 7 to 10 The reception method according to any one of the above.

  As an application example of the present invention, application to communication using the tropospheric scatter propagation method and non-line-of-sight communication can be considered.

3a, 3b Antenna 4a, 4b Drive unit 5a, 5b BPF (band-pass filter)
6a, 6b LNA (low noise amplifier)
7a, 7b D / C (down converter)
8a, 8b AGC (automatic gain controller)
9a, 9b AMF (Adaptive matched filter)
10 Synthesis Circuit 11 DFE (Decision Feedback Type Equalizer)
12 CONT (control unit)
100 transmitting station 200 receiving station 300 scattering region

Claims (10)

  1. A reception device that performs diversity reception using reception signals of a plurality of antennas,
    A receiving apparatus, comprising: the plurality of antennas; and a control unit that monitors reception signals from the plurality of antennas and controls elevation angles and beam widths of the plurality of antennas according to a monitoring result.
  2.   The receiving apparatus according to claim 1, wherein the control unit performs control so as to widen a beam width of the plurality of antennas when a reception input level of a reception signal from the plurality of antennas decreases.
  3.   The receiving device according to claim 1, wherein the control unit controls the beam widths of the plurality of antennas to be narrowed when reception input levels of reception signals from the plurality of antennas are increased.
  4.   3. The receiving device according to claim 1, wherein the control unit performs no control so as not to change a beam width of the plurality of antennas when reception input levels of reception signals from the plurality of antennas increase. .
  5.   The control unit calculates an RMS (Root Mean Square) of a reception input level of reception signals from the plurality of antennas, and controls the beam width by comparing the calculation result with a threshold value. The receiving device according to claim 4.
  6.   The receiving apparatus according to claim 1, further comprising: an adaptive matched filter that combines multipath energy; a combining circuit that performs diversity combining; and an equalizer that removes intersymbol interference. .
  7. A reception method for performing diversity reception using reception signals of a plurality of antennas,
    A reception method of monitoring received signals from the plurality of antennas and controlling elevation angles and beam widths of the plurality of antennas according to a monitoring result.
  8.   The reception method according to claim 7, wherein when a reception input level of a reception signal from the plurality of antennas decreases, control is performed so as to widen a beam width of the plurality of antennas.
  9.   The reception method according to claim 7 or 8, wherein when a reception input level of a reception signal from the plurality of antennas rises, control is performed so as to narrow a beam width of the plurality of antennas.
  10.   The reception method according to claim 7 or 8, wherein when a reception input level of a reception signal from the plurality of antennas rises, no control is performed without changing a beam width of the plurality of antennas.
JP2015047942A 2015-03-11 2015-03-11 Receiving device and receiving method Pending JP2016171362A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018198987A1 (en) * 2017-04-27 2018-11-01 日本電気株式会社 Radio communication device, radio reception device, and radio communication system
WO2019077839A1 (en) * 2017-10-16 2019-04-25 Necネットワーク・センサ株式会社 Wireless communication station, system, method, and non-transitory computer-readable medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018198987A1 (en) * 2017-04-27 2018-11-01 日本電気株式会社 Radio communication device, radio reception device, and radio communication system
WO2019077839A1 (en) * 2017-10-16 2019-04-25 Necネットワーク・センサ株式会社 Wireless communication station, system, method, and non-transitory computer-readable medium

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