JP4841502B2 - Wraparound canceller circuit - Google Patents

Description

  The present invention relates to a sneak canceller circuit for a transmitter / receiver applicable to a wide range of uses such as logistics management, road traffic management, building entrance / exit management, and more particularly to a sneak canceller circuit used for a transmitter / receiver having a transmission / reception integrated antenna. is there.

  The wraparound canceller circuit is built in a transceiver (RW device) having a single antenna that is used for both transmission and reception, and with respect to a sneak signal transmitted from the transmitter via the antenna (including a circulator described later) during power transmission of the transceiver, A signal having the same amplitude and opposite phase is generated and mixed, and a signal obtained by canceling the wraparound signal is used as an output signal. The wraparound canceller circuit is installed for the purpose of protecting the low noise amplifier of the receiving circuit at the subsequent stage.

  Specifically, using a part of the transmission signal (coupler) as a reference signal, the amplitude and phase of the reference signal are compared with the amplitude and phase of the sneak signal, each error is calculated, and each error is gained. The multiplied value is integrated, and the integration result is used as an amplitude adjustment amount and a phase adjustment amount (hereinafter referred to as “amplitude / phase adjustment amount”) to adjust the amplitude and phase of the reference signal. Subsequently, the reference signal whose amplitude and phase are adjusted is compared again with the amplitude and phase of the wraparound signal, and the adjustment operation is repeated. Hereinafter, the wraparound signal is canceled using a signal having an opposite phase to the reference signal having the adjusted amplitude and phase.

  The conventional wraparound canceller circuit holds the integrated value information (amplitude / phase adjustment amount) obtained in the previous cancel operation (cancellation training) when the transmitter / receiver transmits / receives data to / from the other party using multiple channels. The transmission / reception is started by performing the canceling operation again. Also, when switching the frequency used for transmission / reception, the wraparound canceller operation is performed again by operating the wraparound canceller circuit without retaining the previous integral value information (amplitude / phase adjustment amount) (for example, Non-Patent Document 1).

FIG. 11 is a functional block diagram showing the conventional wraparound canceller circuit 5 described in Non-Patent Document 1 together with the transceiver 1.
FIG. 12 is a timing chart showing the operation of the sneak canceller circuit 5 in FIG. 11, and shows each time change of the sneak signal a, the reference signal b, the amplitude / phase errors c and d, and the output signal e. FIG. 13 is a timing chart showing the overall operation of the transceiver 1 including the wraparound canceller circuit 5. The cancel operation 200 using the center frequency f1, the data transmission / reception 201 using the center frequency f1, and the cancel operation 202 using the center frequency f2. The data transmission / reception 203 at the center frequency f2 is shown.

  In FIG. 11, the transceiver 1 is integrated with a transmission circuit 2 that generates a transmission signal based on a command signal from a control unit (not shown) of the transceiver 1, a circulator 3 that switches a transmission / reception function, and the circulator 3. The constructed transmission / reception integrated antenna 4, the circulator 3 and the wraparound canceller circuit 5 for canceling the wraparound signal a (see the gray arrow from the transmission circuit 2) via the antenna 4, and the output signal of the wraparound canceller circuit 5 a receiving circuit 6 for receiving e.

The antenna 4 supplies power with a transmission signal (radio wave) to the tag 7 fixedly installed on the wall or pillar of the place to be communicated, and transmits / receives data to / from the tag 7.
The wraparound canceller circuit 5 is inserted between the antenna 4 and the receiving circuit 6 in the transceiver 1.

  The transmission circuit 2 includes a distributor 21 that inputs a part of the transmission signal as a reference signal b to the wraparound canceller circuit 5, an amplifier 22 that amplifies the transmission signal via the distributor 21 and outputs the amplified signal to the circulator 3 and the antenna 4. It has.

  The sneak canceller circuit 5 distributes the sneak signal a, the amplitude 51 between the sneak signal a and the reference signal b, the amplitude / phase comparison means 52 for outputting the phase error d, and the amplitude error c. A first integration means 53 that integrates and outputs an amplitude adjustment amount, a second integration means 54 that integrates a phase error d and outputs a phase adjustment amount, and a cancel signal having the same amplitude and opposite phase with respect to the wraparound signal a And a mixer 56 that mixes the cancellation signal and the sneak signal via the distributor 51 to generate the output signal e that cancels the sneak signal a.

The wraparound signal a is transmitted from the transmission circuit 2 to the reception circuit 6 via the circulator 3 (or the circulator 3 and the antenna 4) when transmitting power as a transmission signal from the transmission circuit 2 to the tag 7 via the circulator 3. Input.
The amplitude / phase adjustment means 55 adjusts the amplitude and phase of the reference signal b based on the amplitude / phase adjustment amount, and generates a cancel signal for the wraparound signal a.

  The conventional wraparound canceller circuit 5 shown in FIG. 11 takes a part of the transmission signal as the reference signal b, and obtains the amplitude and phase of the reference signal b and the amplitude and phase of the wraparound signal a after passing through the distributor 51. The operation of adjusting the amplitude and phase of the reference signal b is repeatedly performed by comparing the amplitude error c and the phase error d by comparing them with each other and using the integration results as amplitude / phase adjustment amounts.

However, in the conventional wraparound canceller circuit 5, the function or means for holding the integrated value information (amplitude / phase adjustment amount) obtained in the previous cancel operation (cancel training) is not specified.
Therefore, when transmission / reception is started again after transmission / reception ends, the previous center frequency f1 is also used when the center frequency f (channel CH) used in transmission / reception is switched from f1 (CH1) to f2 (CH2). Since the integral value information (amplitude / phase adjustment amount) obtained by the cancel operation is not held, the wraparound canceller circuit 5 is operated again using the new center frequency f2, and the wraparound is performed as shown in FIG. The signal a was cancelled.

  For example, in FIG. 13, the data transmission / reception 201 at the center frequency f1 is performed following the cancel operation (cancel training) 200 at the center frequency f1, and similarly, following the cancel operation (cancel training) 202 at the center frequency f2, Data transmission / reception 203 is performed at the center frequency f2.

  As a result, as shown by the cancel operation 200 using the center frequency f1 or the cancel operation 202 using the center frequency f2, the time required to cancel the wraparound signal a by performing the cancel operation is about several tens of ms. Compared to the time (for example, about 500 us in the “ISO / IEC 18000-6 standard”) defined for each data transmission / reception between 1 and the other party such as the tag 7, it is several tens of times longer.

  Therefore, since the timing for starting the data transmission / reception 201, 203 of the transceiver 1 is remarkably delayed and the cancel operation is repeatedly performed as shown in FIG. 13, the time used for data transmission / reception is also significantly limited. It has an adverse effect on transmission.

"Adaptive wraparound canceller for UHF band RFID reader (B-5-105)" in "2005 Society Conference Proceedings (The Institute of Electronics, Information and Communication Engineers)"

  In the conventional sneak canceller circuit, it takes a long time to completely cancel the sneak signal a, the cancel operation times 200 and 202 cannot be shortened, and the cancel operation is repeatedly executed every time the center frequency used is switched. Therefore, there is a problem that the time for data transmission / reception 201, 203 of the transceiver 1 cannot be provided for a long period from an earlier time point, and high-speed transmission cannot be dealt with.

  The present invention has been made in order to solve the above-described problems. The wraparound canceller that can shorten the canceling operation time and can quickly shift to communication with the other party such as a tag even when the use frequency is switched. The purpose is to obtain a circuit.

A sneak canceller circuit according to the present invention is a sneak canceller circuit provided between a transmitter and a receiver having a transmission / reception integrated antenna, a transmission circuit, and a reception circuit, and inserted between the antenna and the reception circuit. Distributing means for distributing a sneak signal that wraps around from the transmitting circuit to the receiving circuit via the antenna when transmitting power as a signal, the amplitude and phase of the reference signal consisting of a part of the transmission signal, and a sneak signal via the distributing means Amplitude / phase comparison means for comparing the amplitude and phase of each of them, and outputting amplitude / phase error, integrating means for integrating the amplitude / phase error and outputting amplitude / phase adjustment amount, and amplitude / phase adjustment amount Amplitude / phase adjustment means for adjusting the amplitude and phase of the reference signal based on the signal and generating a cancel signal having the same amplitude and opposite phase with respect to the wraparound signal , By mixing the echo signal through the cancellation signal and distributing means, echo and mixing means for generating an output signal that cancels the signals, and a connected storage means to the integrating means, storage means, wraparound signal In the sneak canceller circuit for storing the amplitude / phase adjustment amount at the canceled stage, the transmission / reception frequency includes a frequency of a plurality of channels, and the storage means stores the amplitude / phase adjustment amount at the stage where the sneak signal is canceled, The integration unit stores the amplitude and phase adjustment amount for each frequency of the plurality of channels stored in the storage unit when the transmission / reception is performed by switching the frequency of the plurality of channels. This is used as the initial value of the integral value information at.

  According to the present invention, it is possible to allocate a long time for data transmission / reception of the transceiver by reducing the number of cancel operations and reducing the time occupied by the cancel operation in the transceiver, and has a transmission / reception integrated antenna. A large amount of information can be dealt with at an early timing in the transceiver.

Embodiment 1 FIG.
FIG. 1 is a functional block diagram showing a sneak canceller circuit 5A of a reference example related to the present invention together with a transceiver 1A, and the same components as those described above (see FIG. 11) are denoted by the same reference numerals as described above, or A detailed description will be omitted by adding “A” after the reference numeral.
2 is a timing chart showing the operation of the sneak canceller circuit 5 in FIG. 1, and FIG. 3 is a timing chart showing the overall operation of the transceiver 1A including the sneak canceller circuit 5A. Components similar to 13) are denoted by the same reference numerals as described above.

In FIG. 1, the wraparound canceller circuit 5 </ b> A includes a first memory 57 connected to the first integrating means 53 and a second memory 58 connected to the second integrating means 54 in addition to the above-described components 51 to 56. It has.
The first memory 57 stores amplitude adjustment amount information M calculated by the first integration unit 53, and the second memory 58 stores phase adjustment amount information P calculated by the second integration unit 54.

In FIG. 2, the sneak signal a ′ immediately after approaching the vehicle, the reference signal b ′ immediately after approaching the vehicle, the amplitude / phase errors c ′ and d ′ in the cancel operation immediately after approaching the vehicle, and the cancel operation immediately after approaching the vehicle. The output signal e ′ of the sneak canceller circuit 5 is shown.
In FIG. 3, the cancel operation (cancellation training) 200 with the center frequency f1 as described above (see FIG. 13), the data transmission / reception 201 with the center frequency f1, the cancel operation 200 ′ with the center frequency f1 after the environmental change, The processing procedure of the data transmission / reception 201 by the center frequency f1 at the time of power OFF / ON is shown.

Next, the operation of the reference example will be described with reference to FIG. 4 and the flowchart of FIG. 5 together with FIGS.
FIG. 4 schematically shows the surrounding environment of the transceiver 1A including the wraparound canceller circuit 5A in FIG. 4, the tag 7 transmits and receives data to and from the transceiver 1A. The vehicle 8 travels in the vicinity of the transceiver 1A, and changes the surrounding environment of the transceiver 1A.

In FIG. 5, first, the sneak canceller circuit 5A performs a cancel operation 200 (see FIG. 3) for the sneak signal a at the center frequency f1 (step S101).
That is, at the time of power transmission from the transceiver 1A, a part of the transmission signal amplified by the amplifier 22 through the distributor 21 in the transmission circuit 2 passes through the circulator 3 (or the circulator 3 and the antenna 4). A cancel operation is performed on the sneak signal a transmitted to the receiving circuit 6 side. Here, for the sake of convenience, the circulator 3 will be described as a part of the configuration of the antenna 2.

The cancel operation 200 in step S101 is performed over a long period of time, similar to the waveforms shown in FIGS.
Specifically, first, in the sneak canceller circuit 5A, the amplitude / phase comparison means 52 uses a part of the transmission signal (the output signal of the distributor 21) as a reference signal b and the amplitude and phase between the sneak signal a. Each phase is compared, and a value obtained by multiplying each error by a gain is calculated as amplitude / phase errors c and d.

The first integrating means 53 integrates the amplitude error c, the second integrating means 54 integrates the phase error d, and inputs each integration result to the amplitude / phase adjusting means 55 as an amplitude / phase adjustment amount.
As a result, the amplitude and phase of the output signal of the amplitude / phase adjusting means 55 are adjusted to become a cancel signal for the wraparound signal a and input to the mixer 56.
As a result, the mixer 56 mixes the sneak signal a that has passed through the distributor 51 and the output signal of the amplitude / phase adjusting means 55, and inputs the output signal e that cancels the sneak signal a to the receiving circuit 6. Thereafter, the wraparound canceller circuit 5A repeatedly executes the cancel operation until a predetermined end condition is satisfied.

  Next, it is determined whether or not the power of the output signal e from the sneak canceller circuit 5A is equal to or less than a certain value (dBm) (step S102), and if it is determined that the output signal e> a certain value (that is, NO). Returning to step S101, the cancel operation 200 is repeatedly executed.

  On the other hand, if it is determined in step S102 that the output signal e ≦ a constant value (that is, YES), the cancel operation 200 is terminated and the amplitude adjustment amount information M obtained by the first integration means 53 is stored in the first memory 57. The phase adjustment amount information P obtained by the second integration means 54 is stored in the second memory 58 (step S103).

  Subsequently, the amplitude / phase adjustment means 55 is adjusted while holding the amplitude adjustment amount information M and the phase adjustment amount information P obtained in step S103, and the tag 7 is transmitted from the transceiver 1A via the antenna 4 at the center frequency f1. Data transmission / reception 201 (see FIG. 3) is performed (step S104).

Here, it is assumed that the surrounding environment of the transceiver 1A has changed due to the approach of the vehicle 8 to the transceiver 1A (see the black triangle mark in FIG. 3) (step S105).
At this time, since the reflectance of the antenna 4 in the transceiver 1A changes due to the approach of the vehicle 8, the amplitude and phase of the sneak signal a change, and a sneak signal a ′ (FIG. 2) different from the sneak signal a in step S101. Reference).

Subsequently, the first integration unit 53 extracts the amplitude adjustment amount information M from the first memory 57, and the second integration unit 54 extracts the phase adjustment amount information P from the second memory 58, and the amplitude / phase adjustment unit 55, respectively. Is input as an initial value for adjustment (step S106).
As a result, the amplitude / phase adjustment means 55 performs the cancel operation 200 ′ after the environmental change at the center frequency f1, using the amplitude adjustment amount information M and the phase adjustment amount information P obtained in step S106 as initial values for adjustment. This is performed (step S107).

  Specifically, as in the above-described step S101, first, the amplitude / phase comparison means 52 passes through the distributor 21 in the transmission circuit 2 and is amplified by the amplifier 22 during power transmission of the transceiver 1A, and then the circulator. 3 is compared with the sneak signal a ′ using a part of the transmission signal (the output signal of the distributor 21) as a reference signal b ′, A value obtained by multiplying the error and gain multiplied is output as amplitude / phase errors c ′ and d ′.

The first integrating means 53 integrates the amplitude error c ′, the second integrating means 54 integrates the phase error d ′, and inputs each integration result to the amplitude / phase adjusting means 55 as an amplitude / phase adjustment amount. .
As a result, the amplitude and phase of the output signal of the amplitude / phase adjusting means 55 are adjusted and input to the mixer 56. The mixer 56 mixes the sneak signal a ′ that has passed through the distributor 51 and the output signal of the amplitude / phase adjusting means 55 and inputs the mixed signal to the receiving circuit 6 as the output signal e ′. Thereafter, the wraparound canceller circuit 5A repeatedly executes the cancel operation until a predetermined end condition is satisfied.

  Next, it is determined whether or not the power of the output signal e ′ of the sneak canceller circuit 5A is equal to or less than a constant value (dBm) (step S108), and it is determined that the output signal e ′> a constant value (that is, NO). Then, the process returns to step S107, and the cancel operation 200 ′ after the environmental change is repeatedly executed.

  On the other hand, if it is determined in step S108 that the output signal e ′ ≦ constant value (that is, YES), the cancel operation 200 ′ (see FIGS. 2 and 3) after the environmental change is terminated, and the first integrating means 53 Is stored in the first memory 57, and the phase adjustment amount information P 'obtained by the second integration means 54 is stored in the second memory 58 (step S109).

  Subsequently, the amplitude / phase adjustment means 55 is adjusted while holding the amplitude adjustment amount information M ′ and the phase adjustment amount information P ′ obtained in step S109, and the center frequency f1 is transmitted from the transceiver 1A via the antenna 4. Data transmission / reception 201 is performed with the tag 7 (step S110). Thereafter, the transmitter / receiver 1A performs transmission / reception with the tag 7 as necessary, and ends the processing routine of FIG.

  At this time, the amplitude and phase error between the amplitude and phase of the amplitude / phase adjusting means 55 output signal based on the amplitude adjustment amount information M and the phase adjustment amount information P obtained in step S106 and the amplitude and phase of the wraparound signal a ′. Since c ′ and d ′ are smaller than the errors c and d due to the amplitude adjustment amount information M and the phase adjustment amount information P at the start of step S101, the time required for the cancel operation 200 ′ in step S107 is the same as that in step S101. This is shorter than the time required for the cancel operation 200.

Next, referring to the flowchart of FIG. 6 together with FIG. 3, the operation at the time of power ON / OFF according to the reference example will be described. Steps S201 to S204 in FIG. 6 are the same processes as steps S101 to S104 described above (see FIG. 5), and step S207 in FIG. 6 corresponds to step S106 in FIG.

In FIG. 6, first, the wraparound canceller circuit 5A performs a cancel operation (cancellation training) 200 for the wraparound signal a at the center frequency f1 (step S201).
Subsequently, it is determined whether or not the power of the output signal e of the sneak canceller circuit 5A is equal to or less than a certain value (dBm) (step S202), and if it is determined that the output signal e> a certain value (that is, NO), Returning to step S201, the cancel operation is repeated.

  On the other hand, if it is determined in step S202 that the output signal e ≦ a constant value (that is, YES), the cancel operation 200 is terminated, and the amplitude adjustment amount information M obtained by the first integration means 53 is stored in the first memory 57. And the phase adjustment amount information P obtained by the second integration means 54 is stored in the second memory 58 (step S203).

  Subsequently, the amplitude / phase adjustment means 55 is adjusted while holding the amplitude adjustment amount information M and the phase adjustment amount information P obtained in step S203, and the tag 7 is transmitted from the transceiver 1A via the antenna 4 at the center frequency f1. Data transmission / reception 201 (see FIG. 3) is performed (step S204).

In this case, it is assumed that the vehicle 8 does not exist in the vicinity of the transceiver 1A.
Here, assuming that the power of the transceiver 1A is turned off (step S205) and then the power of the transceiver 1A is turned on (step S206), the first integrator 53 reads the amplitude adjustment amount information M from the first memory 57. The second integrating means 54 extracts the phase adjustment amount information P from the second memory 58 (step S207).

Next, the amplitude / phase adjustment means 55 is adjusted while holding the amplitude adjustment amount information M and the phase adjustment amount information P obtained in step S207, and the tag 7 is transmitted from the transceiver 1A via the antenna 4 at the center frequency f1. The data is transmitted and received (step 208), and the processing routine of FIG. 6 is terminated.
In this case also, it is assumed that the vehicle 8 does not exist in the vicinity of the transceiver 1A.

As described above, the wraparound canceller circuit 5A of the reference example is provided in the transceiver 1A having the transmission / reception integrated antenna 4, the transmission circuit 2, and the reception circuit 6, and is inserted between the antenna 4 and the reception circuit 6. ing.
The wraparound canceller circuit 5A, when transmitting power from the transmission circuit 2 as a transmission signal, distributes the wraparound signal a that wraps around from the transmission circuit 2 to the reception circuit 6 via the antenna 4, and one of the transmission signals. An amplitude / phase comparison means 52 for comparing the amplitude and phase of the reference signal b composed of a part and the amplitude and phase of the sneak signal a via the distributor 51 to output amplitude / phase errors c and d; First and second integrating means 53 and 54 for integrating amplitude / phase errors c and d and outputting amplitude / phase adjustment amounts are provided.

  The wraparound canceller circuit 5A adjusts the amplitude and phase of the reference signal b based on the amplitude / phase adjustment amount, and generates an amplitude / phase adjustment means 55 that generates a cancel signal having the same amplitude and opposite phase with respect to the wraparound signal a. And a mixer 56 that mixes the cancellation signal and the sneak signal a via the distributor 51 to generate an output signal e in which the sneak signal a is canceled.

Further, the sneak canceller circuit 5A includes first and second memories 57 and 58 (storage means) connected to the first and second integration means 53 and 54 for storing the amplitude / phase adjustment amount information M and P. Yes.
The mixer 56 generates an output signal e in which the sneak signal a is canceled using the cancel signal during power transmission by the transmission signal at the transmission / reception frequency of the transceiver 1A, and the first and second memories 57 and 58 The amplitude / phase adjustment amount at the stage where the signal a is canceled is stored as amplitude / phase adjustment amount information M and P.

As a result, the amplitude / phase adjustment amount information M and P in the first and second memories 57 and 58 is adjusted for initial adjustment by the amplitude / phase adjustment means 55 when the environment of the transceiver 1A changes or when the power is turned on / off. Since the value can be a value, the number of cancel operations by the wraparound canceller circuit 5A can be reduced, and the time occupied by the cancel operation in the transceiver 1A can be reduced.
Further, since it is possible to allocate a long time for data transmission / reception by the transceiver 1A, the transceiver 1A having the transmission / reception integrated antenna 4 can deal with a large amount of information at an earlier timing.

In the above reference example , the case where the transmission / reception frequency is a plurality of channels is not considered .
FIG. 7 is a functional block diagram showing a sneak canceller circuit 5B according to the first embodiment of the present invention. Components similar to those described above (see FIG. 1) are denoted by the same reference numerals as those described above or after the reference numerals. Detailed description is omitted with “B”.
In FIG. 7, only the storage contents of the first memory 57B and the second memory 58B are different from the above.

  The first memory 57B includes amplitude adjustment amount information M1 at the center frequency f1 (for example, channel CH1) and center frequency f2 (for example, the channel) as amplitude adjustment amount information after completion of the cancel operation in the n channels (CH1 to CHn). Amplitude adjustment amount information M2 in CH2),..., Amplitude adjustment amount information Mn in center frequency fn (for example, channel CHn) is stored.

  Similarly, the second memory 58B includes phase adjustment amount information P1 at the center frequency f1 (for example, channel CH1) and center frequency f2 (as the phase adjustment amount information after completion of the cancel operation on the n channels (CH1 to CHn)). For example, phase adjustment amount information P2 in channel CH2),..., Phase adjustment amount information Pn in center frequency fn (for example, channel CHn) are stored.

In this case, the mixer 56 generates an output signal e in which the sneak signal a is canceled during power transmission for each frequency of a plurality of channels. Are stored for each frequency of a plurality of channels.
The first and second integrating means 53 and 54 adjust the amplitude and phase for each frequency of the plurality of channels stored in the first and second memories 57B and 58B when transmitting and receiving by switching the frequencies of the plurality of channels. The quantity information M1 to Mn and P1 to Pn are taken out and used as initial values of integral value information (adjustment quantity information) at the frequency after switching.

Next, the operation according to the first embodiment of the present invention will be described with reference to the timing chart of FIG. 8 and the flowcharts of FIGS. 9 and 10 together with FIGS. 2 and 4 described above.
FIG. 8 is a timing chart showing the overall operation of the transceiver 1B including the wraparound canceller circuit 5B according to Embodiment 1 of the present invention.

In FIG. 8, the same operations as those described above (see FIGS. 3 and 13) are denoted by the same reference numerals as described above.
In this case, a cancel operation (cancellation training) 200 using the center frequency f1, a data transmission / reception 201 using the center frequency f1, a cancel operation (cancellation training) 202 using the center frequency f2, a data transmission / reception 203 using the center frequency f2, and the post-environment change In addition to the cancel operation 200 ′ with the center frequency f1, the cancel operation 204 with the center frequency fn, the data transmission / reception 205 with the center frequency fn, the cancel operation 202 ′ with the center frequency f2 after the environmental change, and the post-environment change A cancel operation 204 ′ with a center frequency fn is shown.

9 and 10, the process of step S317 in FIG. 9 is continued to the process of step S318 in FIG.
Steps S301 to S303 in FIG. 9 are the same processes as steps S101 to S103 and S201 to S203 described above (see FIGS. 5 and 6). In FIG. 10, steps S318 to S322 are the same as steps S105 to S109 described above (see FIG. 5).

In FIG. 9, first, the sneak canceller circuit 5B performs a cancel operation 200 on the sneak signal a at the center frequency f1 (CH1) (step S301).
That is, the amplitude / phase comparison means 52 transmits a part of the transmission signal (of the distributor 21) with respect to the sneak signal a transmitted from the transmission circuit 2 to the reception circuit 6 side via the circulator 3 during power transmission of the transceiver 1B. The first and second integrating means 53 are set as amplitude / phase errors c and d by comparing the amplitude and phase with the sneak signal a using the output) as the reference signal b, and taking the respective errors and multiplying the gains. , 54.

  The first integration unit 53 integrates the amplitude error c, the second integration unit 54 integrates the phase error d, and inputs each integration result to the amplitude / phase adjustment unit 55 as an amplitude adjustment amount and a phase adjustment amount. As a result, the amplitude and phase of the output signal of the amplitude / phase adjusting means 55 are adjusted and input to the mixer 56.

The mixer 56 mixes the wraparound signal a that has passed through the distributor 51 and the output signal of the amplitude / phase adjusting means 55 and inputs the mixed signal to the receiving circuit 6 as an output signal e. Thereafter, the wraparound canceller circuit 5B repeatedly executes the cancel operation until a predetermined end condition is satisfied.
Subsequently, it is determined whether or not the power of the output signal e of the sneak canceller circuit 5B is equal to or less than a certain value (dBm) (step S302), and if it is determined that the output signal e> a certain value (that is, NO), Returning to step S301, the cancel operation is repeated.

  On the other hand, if it is determined in step S302 that the output signal e ≦ a constant value (that is, YES), the cancel operation 200 is terminated, and the amplitude adjustment amount information M1 obtained by the first integration means 53 is stored in the first memory 57B. And the phase adjustment amount information P1 obtained by the second integration means 54 is stored in the second memory 58B (step S303).

  Next, at the center frequency f2 (CH2), the cancel operation 202 for the sneak signal a is performed (step S304), and it is determined whether or not the power of the output signal e of the sneak canceller circuit 5B is equal to or less than a certain value (dBm). (Step S305), if it is determined that the output signal e> a constant value (that is, NO), the process returns to Step S304 to repeatedly execute the cancel operation.

  On the other hand, if it is determined in step S305 that the output signal e ≦ a constant value (that is, YES), the cancel operation 202 is ended, and the amplitude adjustment amount information M2 obtained by the first integration means 53 is stored in the first memory 57B. And the phase adjustment amount information P2 obtained by the second integration means 54 is stored in the second memory 58B (step S306).

  Thereafter, similarly, the cancel operation 204 for the sneak signal a is performed at the center frequency fn (CHn) (step S307), and whether or not the power of the output signal e of the sneak canceller circuit 5B is equal to or less than a certain value (dBm). (Step S308), and if it is determined that the output signal e> a constant value (that is, NO), the process returns to step S307 to repeatedly execute the cancel operation.

  On the other hand, if it is determined in step S308 that the output signal e ≦ a constant value (that is, YES), the cancel operation 204 is terminated, and the amplitude adjustment amount information Mn obtained by the first integration means 53 is stored in the first memory 57B. The phase adjustment amount information Pn obtained by the second integration means 54 is stored in the second memory 58B (step S309).

  Next, the first integration unit 53 extracts the amplitude adjustment amount information M1 from the first memory 57B, and the second integration unit 54 extracts the phase adjustment amount information P1 from the second memory 58B (step S310), and the extracted amplitude. The amplitude / phase adjustment means 55 is adjusted while holding the adjustment amount information M1 and the phase adjustment amount information P1, and data transmission / reception 201 is performed from the transceiver 1B via the antenna 4 at the center frequency f1 (step S311). At this time, the cancel operation is not performed.

  Subsequently, the first integration unit 53 extracts the amplitude adjustment amount information M2 from the first memory 57B, and the second integration unit 54 extracts the phase adjustment amount information P2 from the second memory 58B (step S312), and the extracted amplitude. The amplitude / phase adjustment means 55 is adjusted while holding the adjustment amount information M2 and the phase adjustment amount information P2, and the data transmission / reception 203 is performed from the transceiver 1B via the antenna 4 at the center frequency f2 (step S313). At this time, the cancel operation is not performed.

  Thereafter, similarly, the first integration unit 53 extracts the amplitude adjustment amount information Mn from the first memory 57B, and the second integration unit 54 extracts the phase adjustment amount information Pn from the second memory 58B (step S314). The amplitude / phase adjustment means 55 is adjusted while holding the extracted amplitude adjustment amount information Mn and phase adjustment amount information Pn, and data transmission / reception 205 is performed from the transceiver 1B via the antenna 4 at the center frequency fn (step S313). . At this time, the cancel operation is not performed.

  Next, the first integration unit 53 extracts the amplitude adjustment amount information M1 from the first memory 57B, and the second integration unit 54 extracts the phase adjustment amount information P1 from the second memory 58B (step S316), and the extracted amplitude. The amplitude / phase adjustment means 55 is adjusted while holding the adjustment amount information M1 and the phase adjustment amount information P1, and data is transmitted / received from the transceiver 1B via the antenna 4 at the center frequency f1 (step S317).

  Next, in FIG. 10, when the environment of the transceiver 1B changes due to the approach of the vehicle 8 (see FIG. 4) to the transceiver 1B (step S318), the wraparound occurs due to the change in the reflectance of the antenna 4 in the transceiver 1B. The amplitude and phase of the signal a change, resulting in a sneak signal a ′ different from the sneak signal a to be canceled in step S301.

  At this time, the first integration unit 53 extracts the amplitude adjustment amount information M1 from the first memory 57B, and the second integration unit 54 extracts the phase adjustment amount information P1 from the second memory 58B (step S319), and the extracted amplitude. Using the adjustment amount information M1 and the phase adjustment amount information P1 as initial values for adjustment of the amplitude / phase adjustment means 55, a cancel operation 200 ′ for the sneak signal a ′ at the center frequency f1 is performed (step S320).

  Specifically, the amplitude / phase comparison unit 52 performs a part of the transmission signal (with respect to the wraparound signal a ′ transmitted from the transmission circuit 2 to the reception circuit 6 via the circulator 3 during power transmission of the transceiver 1B ( The amplitude and phase are compared with the sneak signal a ′ using the output of the distributor 21) as the reference signal b ′, and amplitude / phase errors c ′ and d ′ are input to the first and second integrating means 53 and 54, respectively. To do.

The first integration unit 53 integrates the amplitude error c ′, the second integration unit 54 integrates the phase error d, and inputs each integration result to the amplitude / phase adjustment unit 55 as an amplitude adjustment amount and a phase adjustment amount, The amplitude and phase of the output signal of the amplitude / phase adjusting means 55 are adjusted.
The mixer 56 mixes the sneak signal a ′ that has passed through the distributor 51 and the output signal of the amplitude / phase adjusting means 55 and inputs the mixed signal to the receiving circuit 6 as the output signal e ′. Thereafter, the cancel operation is repeatedly executed until a predetermined end condition is satisfied.

  Next, it is determined whether or not the power of the output signal e ′ of the sneak canceller circuit is equal to or less than a certain value (dBm) (step S321), and if it is determined that the output signal e ′> a certain value (that is, NO). Returning to step S319, the cancel operation 200 ′ is repeatedly executed.

  On the other hand, if it is determined in step S321 that the output signal e ′ ≦ constant value (that is, YES), the cancel operation 200 ′ is terminated, and the amplitude adjustment amount information M1 obtained by the first integrating means 53 is set to the first. The phase adjustment amount information P1 obtained by the second integration means 54 is saved in the memory 57B, and is saved in the second memory 58B (step S322).

  Next, the first integration unit 53 extracts the amplitude adjustment amount information M2 from the first memory 57B, and the second integration unit 54 extracts the phase adjustment amount information P2 from the second memory 58B (step S323), and the extracted amplitude. Using the adjustment amount information M2 and the phase adjustment amount information P2 as initial values for adjustment of the amplitude / phase adjustment means 55, the cancel operation 202 ′ for the sneak signal a ′ at the center frequency f2 is performed (step S324).

  Subsequently, it is determined whether or not the power of the output signal e of the sneak canceller circuit 5B is equal to or less than a certain value (dBm) (step S325), and if it is determined that the output signal e ′> a certain value (that is, NO). Returning to step S324, the cancel operation 202 ′ is repeatedly executed.

  On the other hand, if it is determined that the output signal e ′ ≦ constant value (that is, YES), the cancel operation 202 ′ is terminated, and the amplitude adjustment amount information M2 obtained by the first integration means 53 in step S325 is stored in the first memory 57B. In addition, the phase adjustment amount information P2 obtained by the second integration means 54 is stored in the second memory 58B (step S326).

  Thereafter, similarly, the first integration unit 53 extracts the amplitude adjustment amount information Mn from the first memory 57B, and the second integration unit 54 extracts the phase adjustment amount information Pn from the second memory 58B (step S327). Using the amplitude adjustment amount information Mn and the phase adjustment amount information Pn obtained in step S327 as initial values for adjustment of the amplitude / phase adjustment means, a cancel operation 204 ′ for the sneak signal a ′ at the center frequency fn is performed (step S328). .

  Subsequently, it is determined whether or not the power of the output signal e ′ of the sneak canceller circuit 5B is equal to or less than a predetermined value (dBm) (step S329), and it is determined that the output signal e ′> a constant value (that is, NO). For example, the process returns to step S328, and the cancel operation 204 ′ is repeatedly executed.

  On the other hand, if it is determined that the output signal e ′ ≦ a constant value (ie, YES), the cancel operation 204 ′ is terminated, and the amplitude adjustment amount information Mn obtained by the first integration means 53 in step S329 is stored in the first memory. The phase adjustment amount information Pn obtained by the second integration means 54 is saved in the second memory 58B (step S330).

  Next, the first integration unit 53 extracts the amplitude adjustment amount information M1 from the first memory 57B, and the second integration unit 54 extracts the phase adjustment amount information P1 from the second memory 58B (step S331). The amplitude / phase adjustment means 55 is adjusted while holding the obtained amplitude adjustment amount information M1 and phase adjustment amount information P1, and data is transmitted / received from the transceiver 1B via the antenna 4 at the center frequency f1 (step 332). ).

As described above, in the sneak canceller circuit 5B according to the first embodiment of the present invention, the transmission / reception frequency of the transceiver 1B includes the frequencies f1 to fn of the plurality of channels, and the mixer 56 performs power for each frequency of the plurality of channels. At the time of transmission, an output signal e is generated by canceling the wraparound signal a.

  The first and second memories 57B and 58B (storage means) store the amplitude / phase adjustment amount information M1 to Mn and P1 to Pn at the stage where the loop signal a is canceled for each of the frequencies f1 to fn of the plurality of channels. In addition, when performing transmission / reception by switching the frequencies f1 to fn of the plurality of channels, the amplitude / phase adjustment amount information for each of the frequencies of the plurality of channels stored in the first and second memories 57B and 58B is extracted, and after switching Used as an initial value of integral value information (adjustment amount information) at a frequency.

As a result, even when the transceiver 1B uses a plurality of frequencies (channels), the canceling operation 200, 202, 204 (see FIG. 8) by the wraparound canceller circuit 5B is performed once for each frequency at all the frequencies used in advance. It is only necessary to execute them one by one, and the number of cancel operations can be reduced.
Therefore, since the time occupied by the cancel operations 200, 202, and 204 in the transceiver 1B can be reduced and the time of the data transmission / reception 201, 203, and 205 of the transceiver 1B can be allocated long, the transmission / reception integrated antenna 4 is provided. The transceiver 1B can deal with a large amount of information at an earlier timing.

It is a functional block diagram which shows the wraparound canceller circuit of the reference example relevant to this invention with a transmitter / receiver. It is a timing chart which shows the operation | movement at the time of the environmental change of a reference example . It is a timing chart which shows operation of a transceiver to which a reference example is applied. It is explanatory drawing which shows the surrounding environment of a reference example roughly. It is a flowchart which shows the operation | movement at the time of the environmental change of the wraparound canceller circuit and transmitter / receiver which concerns on Embodiment 1 of this invention. It is a flowchart which shows the operation | movement at the time of power ON / OFF of the wraparound canceller circuit and transmitter / receiver which concerns on Embodiment 1 of this invention. It is a functional block diagram which shows the wraparound canceller circuit which concerns on Embodiment 1 of this invention with a transmitter / receiver. It is a timing chart which shows operation | movement of the transmitter / receiver to which the wraparound canceller circuit which concerns on Embodiment 1 of this invention is applied. It is a flowchart which shows operation | movement of the wraparound canceller circuit and transmitter / receiver which concern on Embodiment 1 of this invention. FIG. 10 is a flowchart subsequent to FIG. 9 illustrating the operation of the wraparound canceller circuit and the transceiver according to the first embodiment of the present invention. FIG. It is a functional block diagram which shows the conventional wraparound canceller circuit with a transmitter / receiver. It is a timing chart which shows operation | movement of the conventional wraparound canceller circuit. It is a timing chart which shows operation | movement of the transmitter / receiver to which the conventional wraparound canceller circuit is applied.

Explanation of symbols

  1A, 1B transceiver, 2 transmitting circuit, 6 receiving circuit, 4 antenna, 5A, 5B canceller circuit, 51 distributor (distributing means), 52 amplitude / phase comparing means, 53 first integrating means, 54 second integrating means, 55 Amplitude / phase adjustment means, 56 Mixer (mixing means), 57, 57B First memory (storage means), 58, 58B Second memory (storage means), a, a 'sneak signal, b, b' reference signal , C, c ′ amplitude error, d, d ′ phase error, e, e ′ output signal, M, M1 to Mn amplitude adjustment amount information, P, P1 to Pn phase adjustment amount information.

Claims (1)

A wraparound canceller circuit provided in a transceiver having a transmission / reception integrated antenna, a transmission circuit and a reception circuit, and inserted between the antenna and the reception circuit;
Distribution means for distributing a sneak signal that wraps around from the transmission circuit to the reception circuit via the antenna when transmitting power as a transmission signal from the transmission circuit;
Amplitude / phase comparison means for comparing the amplitude and phase of a reference signal comprising a part of the transmission signal with the amplitude and phase of a sneak signal via the distribution means, and outputting an amplitude / phase error;
Integrating means for integrating the amplitude / phase error and outputting an amplitude / phase adjustment amount;
Amplitude / phase adjustment means for adjusting the amplitude and phase of the reference signal based on the amplitude / phase adjustment amount and generating a cancel signal having the same amplitude and opposite phase with respect to the sneak signal;
Mixing means for mixing the cancellation signal and the sneak signal via the distribution means to generate an output signal that cancels the sneak signal;
Storage means connected to the integrating means,
In the sneak canceller circuit for storing the amplitude / phase adjustment amount when the sneak signal is canceled ,
The transmission / reception frequency includes a frequency of a plurality of channels,
The storage means stores, for each frequency of the plurality of channels, amplitude / phase adjustment amounts when the sneak signal is canceled,
The integration means takes out the amplitude / phase adjustment amount for each frequency of the plurality of channels stored in the storage means when switching the frequencies of the plurality of channels and performs transmission / reception, and obtains integrated value information of the frequency after the switching. A wraparound canceller circuit characterized by being used as an initial value .

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