JP2016163218A - Radio transmission/reception device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change between transmission and reception if a synchronous signal is not supplied from a base station device.SOLUTION: A radio transmission/reception device includes: an amplifier unit which amplifies an input signal; a control unit which performs operation control; and a first directional coupling unit and an input detector unit, disposed at the pre-stage of the amplifier unit, for detecting an input signal. The control unit determines transmission timing in a section between a rise and a fall defined from the rise of a signal, detected by the input detector unit from the first directional coupling unit, as a base point, to switch the amplifier unit operation to be ON at timing based on the transmission timing, and switch the amplifier unit operation to be OFF at other than the timing based on the transmission timing.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a wireless transmission / reception apparatus.

A configuration of a conventional wireless transmission / reception apparatus will be described with reference to FIGS. 1 and 2.
FIG. 1 is a block diagram schematically showing a TDD (Time Division Duplex) method radio transceiver apparatus.
In FIG. 1, a wireless transmission / reception apparatus 100 includes a transmission amplification unit 113, a reception amplification unit (low noise amplification unit) 117, RF (Radio Frequency) signal switching switches 112 and 114, and a control unit 116. And an antenna 115.
The TDD wireless transmission / reception apparatus uses the same frequency band for the transmission signal Tx and the reception signal Rx in the radio frequency band. For switching between transmission and reception at a constant cycle, for RF (Radio Frequency) signal switching Switches 112 and 114 are provided.
The switches 112 and 114 are controlled to be switched by a TDD switching timing signal Ts ′. In the transmission mode, the transmission RF input signal is amplified by the amplifying unit 113 via the switch 112 and transmitted from the transmission / reception antenna 115 via the switch 114.
In the reception mode, a reception signal received by the transmission / reception antenna 115 is amplified by the amplification unit 117 via the switch 114 and transmitted to the base station side via the switch 112. The amplifiers 112 and 114 may be controlled to turn off amplification at the time of switching in order to protect devices and switches.
For such switches 112 and 114, a semiconductor device composed of an FET (Field Effect Transistor) or the like is often used, and distortion occurs at high output, resulting in quality degradation. Also, when using a mechanical switch for high output, the reliability is inferior due to the contact life. In order to improve such a point, there is an apparatus using a circulator instead of a switch.

FIG. 2 is a block diagram schematically showing a TDD wireless transmission / reception apparatus using a circulator.
In FIG. 2, a wireless transmission / reception device 200 includes a transmission amplification unit 113, a reception amplification unit (low noise amplification unit) 117, circulator units (CIR, Circuits) 220 and 221, a control unit 116, an antenna, and the like. 115.
In the transmission mode, a transmission RF input signal is amplified by the amplification unit 113 via the circulator unit (CIR) 220 and transmitted from the transmission / reception antenna 115 via the circulator unit (CIR) 221.
On the other hand, in the reception mode, the reception signal received by the transmission / reception antenna 115 is amplified by the amplification unit 117 via the circulator unit (CIR) 221 and transmitted to the base station side via the circulator unit (CIR) 220. The
Since the output power in the normal transmission mode is higher than the reception input level, high attenuation power due to the isolation of the circulator unit (CIR) 221 leaks to the reception side. Also, the VSWR (Voltage Standing Wave Ratio) at the antenna end may be poor and the transmission power may return as it is.

  As a prior art document, for example, in Patent Document 1, a wireless communication device is described, and although not described in detail, in a device that relays a signal between a base station device and a terminal station, a synchronization signal in a relay signal Based on this, transmission / reception control of radio signals was performed.

JP 2010-219847 A

A conventional TDD wireless transmitter / receiver device needs to synchronize with a timing signal from the base station device when switching between transmission and reception, and when the synchronization signal from the base station device is not supplied, it becomes impossible to switch between transmission and reception.
An object of the present invention is to enable switching between transmission and reception even when a synchronization signal from a base station apparatus is not supplied.

  A wireless transmission / reception apparatus according to the present invention includes an amplifying unit that amplifies an input signal, a control unit that performs operation control, a first directional coupling unit and an input detection unit that detect an input signal before the amplifying unit. The control unit includes a rising and falling section based on a rising edge of the signal detected by the input detection unit from the first directional coupling unit as a transmission timing, and a timing based on the transmission timing. The operation of the amplifying unit is turned on, and the operation of the amplifying unit is switched off at timings other than the timing based on the transmission timing.

  The wireless transmission / reception apparatus according to the present invention is the above-described wireless transmission / reception apparatus, further including a second directional coupling unit and an output detection unit for detecting an amplified output signal after the amplification unit, and a control unit Is characterized in that the output detection unit uses the rising and falling sections based on the rising edge of the signal detected from the second directional coupling unit as the correction transmission timing, and corrects the transmission timing using the correction transmission timing. And

  Further, the wireless transmission / reception apparatus of the present invention is the above-described wireless transmission / reception apparatus, and further, the input transmission is a signal repeated at a specific cycle, and the control unit cumulatively adds and averages the transmission timing, and averages the transmission timing. The transmission timing is a transmission timing for operation control.

  The wireless transmission / reception apparatus according to the present invention is the above-described wireless transmission / reception apparatus, and the control unit is excluded from cumulative addition for averaging new transmission timings having a difference greater than a specific value with respect to the averaged transmission timings. It is characterized by doing.

  Furthermore, the wireless transmission / reception apparatus according to the present invention is the above-described wireless transmission / reception apparatus, wherein an error is determined in advance by comparing a first transmission timing section detected first and a second transmission timing section detected next. If it is smaller than the determined value, either the first or second transmission timing interval is adopted, and if the error is equal to or greater than a predetermined value, the next detected third transmission timing interval and the second transmission timing interval are used. A transmission timing in which one transmission timing section is selected from among transmission timing sections in which the error is smaller than a predetermined value by comparing the first and second transmission timing sections, and the transmission timing is used for operation control. It is characterized by.

  According to the present invention, transmission / reception can be switched even when a synchronization signal from the base station apparatus is not supplied.

It is a figure for demonstrating the structural example of the conventional TDD system radio | wireless transmitter / receiver. It is a figure for demonstrating the structural example 2 of the conventional TDD system radio | wireless transmitter / receiver. It is a figure for demonstrating the structural example of the TDD system radio | wireless transmitter / receiver which is one Example of this invention. It is a timing chart for demonstrating the operation | movement of initial transmission / reception in the TDD system radio | wireless transmission / reception apparatus which is one Example of this invention. It is a timing chart for demonstrating the operation | movement of transmission / reception in the TDD system radio | wireless transmitter / receiver which is one Example of this invention. It is a timing chart for demonstrating the operation | movement of transmission / reception in the TDD system radio | wireless transmission / reception apparatus which is another one Example of this invention. It is a figure for demonstrating the structural example of the TDD system radio | wireless transmitter / receiver which is another one Example of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 3 is a diagram for explaining a configuration example of a TDD (Time Division Duplex, time division bidirectional transmission) system wireless transmission / reception apparatus according to an embodiment of the present invention.
In FIG. 3, the wireless transmission / reception apparatus 300 includes an input / output terminal unit 111, circulator (CIR) units 220 and 221, directional coupling (CPL) units 322 and 323, a transmission amplification unit 113, and an antenna unit 115. , An input detection unit 324, a control unit 316, an output detection unit 325, a reception amplification unit (low noise amplification unit) 117, an RF (Radio Frequency) signal switching switch 314, and a termination unit 319.

  In the transmission mode of the wireless transceiver 300, a transmission RF input signal input from the input / output terminal 111 is input to the amplifying unit 113 via the circulator (CIR) unit 220 and the directional coupling (CPL) unit 322, and the amplifying unit 113 is amplified to a predetermined level based on the control signal input from the control unit 316 and transmitted from the antenna unit 115 via the directional coupling (CPL) unit 323 and the circulator (CIR) unit 221.

  In the reception mode of wireless transceiver 300, the received RF signal received by antenna unit 115 is input to amplification unit 117 via circulator (CIR) unit 221 and switch 314, and input from control unit 316 by amplification unit 117. The signal is amplified to a predetermined level based on the control signal and output as a reception RF output signal from the input / output terminal 111 via the circulator (CIR) unit 220.

In the transmission mode, the transmission amplification unit 113 is turned on, the reception amplification unit 117 is turned off, and the switch 314 is switched to the termination unit 319 side. This is to protect the receiving amplification unit 117 from being destroyed by the transmission level from the circulator (CIR) unit 221 or the reflected power from the antenna unit 115.
On the other hand, in the reception mode, the transmission amplification unit 113 is turned off, the reception amplification unit 117 is turned on, and the switch 314 is switched to the amplification unit 117 side. Since the reception operation consumes less power than the transmission mode, the switch 314 may be always turned on.

  A directional coupling (CPL) unit 322 is provided between the circulator (CIR) unit 220 and the amplification unit 113, and a part of the transmission RF signal is separated by the directional coupling (CPL) unit 322. The separated signal from the transmission RF signal is supplied to the input detection unit 324, and the time response of the power level of the transmission RF input signal from the base station is detected by the control unit 316 by detecting the level. The detected transmission RF signal level response can be detected at a sampling period sufficiently faster than the TDD transmission / reception switching timing signal period. On the other hand, the output signal separated by the directional coupling (CPL) unit 323 behind the amplifying unit 113 is subjected to power detection by the output detection unit 325, and the time response is similarly detected by the control unit 316.

Example 1
Next, transmission / reception switching timing in the wireless transmission / reception apparatus 300 will be described with reference to FIGS. 4 and 5.
FIG. 4 is a timing chart for explaining the initial transmission / reception operation in the TDD wireless transmission / reception apparatus according to the embodiment of the present invention.
In FIG. 4, the initial switching timing signal Ts in the transmission section is generated based on the power level obtained by detecting the transmission RF input signal from the base station (not shown) by the input detection unit 324. At this time, since there is no signal in the UL section of the input detection power Pin, the control unit 316 can determine the reference timing Tf that is the rise of DL as the reference of the transmission RF output signal. Since the transmission / reception switching cycle is already known, the control unit 316 sends out a DL / UL switching signal based on this reference.

When the reference timing Tf is detected in one cycle of TDD, there is a possibility of erroneous detection due to sudden noise or the like. Therefore, by adding sampling for a plurality of cycles and determining a transmission interval, more reliable It is also possible to generate a certain transmission / reception switching timing.
However, since the reference timing Tf has not received a synchronization signal from the base station apparatus, a shift occurs with time. Therefore, the synchronization can be maintained by calculating the difference ΔTf between the reference timing Tf and the rising time after the predetermined time elapses from the rising edge of the transmission detection signal and performing correction at predetermined intervals.

Next, the transmission / reception switching timing of the present invention will be described with reference to FIGS.
FIG. 5 is a timing chart for explaining the transmission / reception operation in the TDD radio transmission / reception apparatus according to the embodiment of the present invention.
In FIG. 3, Ts ′ for the transmitter / receiver switching timing signal switches the amplifier 113 for transmission, and the transmission / reception switching timing signal XTs ′ switches the amplifier 117 for reception and the switch 314.
The transmission / reception switching timing signal XTs ′ is a signal obtained by inverting the transmission / reception switching timing signal Ts ′.

The transmission amplifying unit 113, the reception amplifying unit 117, the switch 314, and the like may lose data before and after the base station transmission RF input signal due to response characteristics and circuit control delay. I need to add time.
Here, the transmission mode continuation time of the initial switching timing signal Ts is Td, and the rising response delay time by the circuit or element for the Ts ′ signal is Tr.
The rising response delay time Tr is set within the switching time range permitted by the TDD transmission / reception switching control. Considering the difference between the response delay time Tr and the reference timing time ± ΔTf before and after the transmission time Td, and assuming that the transmission ON time of Ts ′ is Td ′ = Td + 2Tr + 2ΔTf, the transmission / reception switching timing signal Ts generated based on this time Td ′ 'Is sent to each element.

Here, it is assumed that a transmission output level transmission continuation time in which the power level detected by the output detection unit 325 in FIG.
The control unit 316 compares the time response of power from the input detection unit 324 and the output detection unit 325.
If the envelopes from the initial rising power to the falling are the same during the input transmission ON time Td, the transmission / reception switching timing signal Ts ′ can be switched at an appropriate timing.
If the envelopes of the two are different and the transmission output level time Tz is shorter than the input transmission ON time, the shift of the transmission reference timing Tf is large and the switching is delayed. Therefore, it is necessary to advance the switching timing.
Further, when both envelopes are the same halfway and the transmission output level time Tz is short, the transmission is switched quickly, so that the transmission is switched to the receiving side before the transmission data is sent.
Therefore, the control unit 316 performs stable switching control by correcting the transmission / reception switching timing reference so that the power level time response detected by the output detection unit 325 is in the middle of Td ′ = Td + Tr + 2ΔTf. It can be carried out.

(Example 2)
Next, Example 2 will be described with reference to FIGS. 3 and 6.
FIG. 6 is a timing chart for explaining the transmission / reception operation in the TDD wireless transmission / reception apparatus according to another embodiment of the present invention.
FIG. 6A shows a case where the transmission timing error of DL1 and DL2 is smaller than a predetermined value.
FIG. 6B shows a case where the transmission timing error between DL1 and DL2 is greater than or equal to a predetermined value.

In the first embodiment, when the transmission / reception switching timing is generated and the reference timing Tf is detected in one cycle of TDD, there is a possibility of erroneous detection due to sudden noise or the like. An embodiment that generates a more reliable transmission / reception switching timing by determining a transmission interval by adding and averaging is also described, and transmission detection is performed to detect a difference between a reference timing and a rise time after a predetermined time has elapsed. The embodiment has been described in which synchronization is calculated by calculating from the rise of the signal and performing correction at a predetermined cycle interval.
However, there may be a need to promptly start up the system, that is, generate transmission / reception switching timing. In such a case, it is necessary to avoid a plurality of samplings for averaging and correction as much as possible, and an example in which transmission / reception switching timing is generated quickly with a small number of samplings will be described below.

In FIG. 6A, first, detection for the first period is set as a reference timing Tf1 for provisional transmission / reception switching timing. Next, detection for one new period after the detection for the first period is performed as the second reference timing Tf2.
The control unit 316 compares the error between the reference timing Tf1 and the reference timing Tf2 for the first period. When the error is smaller than a predetermined value, the control unit 316 determines that both reference timings are almost correct, and therefore employs either one as the reference timing.

In FIG. 6B, detection for the first one cycle is set as a reference timing Tf1 for provisional transmission / reception switching timing. Next, detection for one new period after the detection for the first period is performed as the second reference timing Tf2.
The control unit 316 compares the error between the reference timing Tf1 and the reference timing Tf2 for the first period. When the error is equal to or greater than a predetermined value, the control unit 316 detects erroneous detection due to sudden noise or the like, either the reference timing Tf1 for the first cycle, the reference timing Tf2 for the new cycle, or both. There is a possibility.

In such a case, detection for one new period is further performed as the third reference timing Tf3.
The control unit 316 compares the first to third reference timings Tf1, Tf2, and Tf3, and determines that the reference timings whose errors are smaller than a predetermined value are substantially correct. Adopt as.
In the case of FIG. 6 (B), the control unit 316 determines that the reference timings whose errors between the reference timing Tf2 and the reference timing Tf3 are smaller than a predetermined value are almost correct, and either of them is adopted as the reference timing. To do.

If there is no sample that can be used as the reference timing even if this comparison process is repeated a specific number of times, it may be determined that a system error has occurred and an alarm may be issued.
This makes it possible to quickly generate transmission / reception switching timing with a small amount of sampling.
Note that errors that may occur later can be operated by applying the correction processing of the first embodiment.

  Further, as a point common to the first embodiment and the second embodiment, in the case of further averaging the transmission / reception switching timing that has been averaged in the averaging processing by a plurality of samplings, the transmission / reception that has been averaged is performed. When the error between the switching timing and the new sampling added to the averaging is equal to or greater than a predetermined error, the sampling may be discarded and the next sampling may be performed. Thereby, the error at the time of averaging can be suppressed.

(Example 3)
Next, a TDD wireless transmission / reception apparatus according to still another embodiment of the present invention will be described with reference to FIG.
Although FIG. 3 shows a configuration example for realizing the present invention, the present invention can also be applied to a configuration example using an optical repeater amplification apparatus such as a master unit configuration and a slave unit configuration as shown in FIG.
FIG. 7 is a diagram for explaining a configuration example of a TDD radio transmitting / receiving apparatus according to another embodiment of the present invention.
In FIG. 7, a wireless transmission / reception device 700 is configured by a parent device 701 and a child device 702.

The base unit 701 includes an input / output terminal unit 111, a circulator unit (CIR) 220, a MIX unit 726, 727, an AD (Analog-to-Digital converter) unit 732, a signal processing unit 736, and a DA (Digital-to-Analog converter). Part 734 and a SYN (Synchronize) part 730.
The handset 702 includes a signal processing unit 737, a DA unit 735, MIX units 728 and 729, an amplification unit 113, a directional coupling unit (CPL) 323, a circulator unit (CIR) 221, an output detection unit 325, a control unit 716, and SYN. A unit 731, a switch 314, an amplification unit 117, and an AD unit 733 are included.
The parent device 701 and the child device 702 are connected by an optical fiber 738.

Next, the transmission mode of FIG. 7 will be described.
A transmission RF input signal input from the input / output terminal 111 of the base unit 701 is input to the MIX unit 726 via the circulator (CIR) unit 220, and an RF (Radio Frequency) signal is transmitted using the MIX unit 726 and the SYN unit 730. Is converted to an IF (Intermediate Frequency) signal, converted to a digital signal by the AD unit 732, subjected to transmission power calculation processing and converted to an optical signal by the signal processing unit 736, and data is transmitted to the slave unit 702 by the optical fiber 738. Is transmitted.

The data input to the slave unit 702 is converted into an electric signal and processed by the signal processing unit 737, converted to an analog signal by the DA unit 735, and the IF signal is converted into an RF signal by using the MIX unit 728 and the SYN unit 731. The signal is converted into a signal, amplified to a predetermined level based on the control signal input from the control unit 716 by the amplification unit 113, and transmitted from the antenna unit 115 via the directional coupling (CPL) unit 323 and the circulator (CIR) unit 221. Sent.
The transmission / reception initial operation switching timing signal Ts ′ calculated by the signal processing unit 736 is transmitted to the control unit 716 of the slave unit 702, and the transmission / reception switching timing signal Ts ′ for the amplifying unit 113, the amplifying unit 117, and the switch 314 or Used as XTs'.

Next, the reception mode of FIG. 7 will be described.
The received RF signal received by the antenna unit 115 of the slave unit 702 is input to the amplification unit 117 via the circulator (CIR) unit 221 and the switch 314, and based on the control signal input from the control unit 716 by the amplification unit 117. The RF signal is converted to IF using the MIX unit 729 and the SYN unit 731, converted to a digital signal by the AD unit 733, converted to an optical signal by the signal processing unit 737, and an optical fiber. Data is transmitted to the base unit 701 by 738.

  Data input to the base unit 701 is converted into an electrical signal by the signal processing unit 736, converted into an analog signal by the DA unit 734, and the IF signal is converted into an RF signal using the MIX unit 727 and the SYN unit 730. The received RF output signal is output from the input / output terminal 111 via the circulator (CIR) unit 220.

  The radio transmission / reception apparatus according to the embodiment of the present invention can switch transmission / reception even when a synchronization signal is not supplied from the base station apparatus.

  Although the present invention has been described in detail above, it is needless to say that the present invention is not limited to the wireless transmission / reception apparatus described here, and can be widely applied to other wireless transmission / reception apparatuses.

  By switching between wireless transmission and reception by itself, the present invention can be applied to a case where a synchronization signal from the base station apparatus is not supplied.

  100, 200, 300: wireless transmission / reception device, 111: input / output terminal section, 112, 314: switch, 113: amplification section, 115: antenna section, 117316, 716: control section, 117: amplification section, 118: terminal section, 220, 221: Circulator unit (CIR), 319: Termination unit, 322, 323: Directional coupling unit (CPL), 324: Input detection unit, 325: Output detection unit, 701: Main unit, 702: Sub unit, 726 727, 728, 729: MIX section, 730, 731: SYN section, 732, 733: AD section, 734, 735: DA section, 736, 737: signal processing section, 738: optical fiber.

Claims (5)

A radio receiving apparatus comprising: an amplifying unit that amplifies an input signal; a control unit that performs operation control; a first directional coupling unit that detects an input signal before the amplifying unit; and an input detecting unit. ,
The control unit uses the rising and falling sections based on the rising edge of the signal detected by the input detection unit from the first directional coupling unit as transmission timing, and the amplification is performed at a timing based on the transmission timing. A wireless transmission / reception apparatus characterized in that the operation of the amplifier is turned on and the operation of the amplifying unit is turned off at a timing other than the timing based on the transmission timing. The wireless transmission / reception device according to claim 1,
Furthermore, a second directional coupling unit and an output detection unit for detecting an amplified output signal are provided after the amplification unit,
The control unit uses the rising and falling sections based on the rising edge of the signal detected by the output detection unit from the second directional coupling unit as a transmission timing for correction, and uses the transmission timing as the transmission for correction. A wireless transmission / reception apparatus that corrects using timing. The wireless transmission / reception apparatus according to claim 1, wherein:
Further, the input transmission is a signal repeated at a specific period,
The wireless transmission / reception apparatus, wherein the control unit cumulatively adds and averages the transmission timings, and uses the averaged transmission timings as transmission timings for operation control. The wireless transmission / reception device according to claim 3,
The said control part is excluded from the accumulation addition for averaging the new transmission timing which has a difference more than specific with respect to the said averaged transmission timing, The radio | wireless transmitter / receiver characterized by the above-mentioned. The wireless transmission / reception apparatus according to claim 1, wherein:
When the first detected transmission timing interval is compared with the second detected second transmission timing interval and the error is smaller than a predetermined value, either the first or second transmission timing is set. When the interval is adopted and the error is greater than or equal to a predetermined value, the error is determined by comparing the third transmission timing interval detected next and the first and second transmission timing intervals. A radio transmission / reception apparatus that employs one of transmission timing intervals between transmission timing intervals smaller than a value and uses the transmission timing as a transmission timing for operation control.

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