JP2014138330A - Wireless circuit - Google Patents

Wireless circuit Download PDF

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Publication number
JP2014138330A
JP2014138330A JP2013006741A JP2013006741A JP2014138330A JP 2014138330 A JP2014138330 A JP 2014138330A JP 2013006741 A JP2013006741 A JP 2013006741A JP 2013006741 A JP2013006741 A JP 2013006741A JP 2014138330 A JP2014138330 A JP 2014138330A
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Prior art keywords
unnecessary radiation
band
frequency
suppressed
transmission signal
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JP2013006741A
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Japanese (ja)
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Shoichi Shidara
彰一 設楽
Masamori Tokuda
正盛 徳田
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Sharp Corp
シャープ株式会社
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Abstract

Unnecessary radiation generated when a transmission signal is output is suppressed.
A radio circuit (10) includes transmission signal output means (12, 13) for outputting a transmission signal, determination means (11) for determining whether or not unnecessary radiation to be suppressed can occur, and determination means. (11) includes an attenuating means (14) for attenuating a signal in a required suppression band including unnecessary radiation to be suppressed in the output signal when it is determined that unnecessary radiation to be suppressed can occur.
[Selection] Figure 1

Description

  The present invention relates to a radio circuit, and more particularly to a radio circuit that can suppress unnecessary radiation.

  In Japan, LTE (Long Term Evolution) is operated using frequency bands of 1930 to 1980 MHz (upstream) and 2120 to 2170 MHz (downstream). A PHS (Personal Handy-phone System) is operated using a frequency band of 1884.5 to 1915.7 MHz.

  Furthermore, it is considered that LTE is operated in a frequency band including 1920 MHz to 1930 MHz (upstream) and 2110 to 2120 MHz (downstream).

TSG-RAN WG4 meetings # 64bis, R4-125272, "Consideration on PHS protection," October 2012

  However, when LTE is operated in a frequency band to which 1920 MHz to 1930 MHz (uplink) is added, it is close to the frequency band of 1884.5 to 1915.7 MHz used by PHS. Therefore, when transmitting using LTE, there is a possibility that unnecessary radiation (spurious) may occur in the frequency band used by PHS.

  FIG. 7 is a diagram illustrating an example of unnecessary radiation generated when transmission is performed using LTE. In FIG. 7, band A represents a frequency band in which PHS is operated, and band B represents a frequency band in which LTE is operated. When a desired transmission signal CS is output using a part of an arbitrary channel band using LTE, the output signal actually output from the antenna includes a carrier leak CL and an image signal IS. included. The carrier leak CL is obtained by outputting a carrier signal of a local transmitter used in a mixer of a radio circuit from an antenna. The image signal IS is a signal (IM wave) generated by intermodulation distortion of the transmission signal CS and the carrier leak CL.

  The IM wave is generated not only in the band B but also in the band A. Since these IM waves may adversely affect a wireless device (PHS in this case) operated in the band A, it is called unnecessary radiation and needs to be within an allowable level (specification).

  Further, FIG. 2.2-1 of Non-Patent Document 1 shows frequency spectra of a transmission signal (yellow) having a center frequency Fc of 1.9325 GHz and a transmission signal (light blue) of 1.9422 GHz. As is clear from FIG. 2.2-1, the frequency spectrum of the yellow and light blue transmission signals includes a plurality of peaks located at frequencies other than Fc. For example, the yellow carrier wave has unnecessary intense radiation at 1.9055 GHz to which the marker 1 is attached.

  As described above, when a wireless device outputs a transmission signal in a certain frequency band, unnecessary radiation may be generated in a frequency band used by another wireless device. The present invention has been made to solve the above-described problems, and a main object of the present invention is to provide a radio circuit that can suitably suppress unnecessary radiation generated when a transmission signal is output.

  In order to solve the above problem, a radio circuit according to an aspect of the present invention includes a transmission signal output unit that outputs a transmission signal using a part of a band in an arbitrary channel band in a first frequency band. And unnecessary radiation suppression means for suppressing unnecessary radiation in a second frequency band different from the first frequency band included in the output signal from the transmission signal output means, and suppressing the unnecessary radiation A means for determining whether or not unnecessary radiation to be suppressed can be generated; and when the determination means determines that unnecessary radiation to be suppressed can occur, the unnecessary radiation to be suppressed in the output signal is determined. And attenuating means for attenuating a signal in a required suppression band including.

  According to one aspect of the present invention, there is an effect that unwanted radiation generated when a transmission signal is output can be suitably suppressed.

It is a block diagram which shows the principal part structure of the radio | wireless apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the attenuation characteristic of the spurious suppression circuit part in Embodiment 1 of this invention. It is a flowchart explaining an example of the control method of the radio | wireless circuit in Embodiment 1 of this invention. It is a figure which shows an example of the frequency characteristic of the output signal in Embodiment 1 of this invention, (a) is the switch with which a spurious suppression circuit is selecting SW1, (b) is the said switch selecting SW2. (C) shows the frequency characteristics when the switch selects SW3. It is a block diagram which shows the principal part structure of the radio | wireless apparatus which concerns on Embodiment 2 of this invention. It is a figure which shows an example of the attenuation | damping characteristic of the spurious suppression circuit part in Embodiment 2 of this invention. It is a figure which shows an example of the frequency characteristic of the output signal in a prior art.

Embodiment 1
Hereinafter, an embodiment (Embodiment 1) of the present invention will be described in detail with reference to FIGS. FIG. 1 is a block diagram illustrating a main configuration of the wireless device according to the first embodiment, and illustrates an antenna 19 and a wireless circuit 10 connected to the antenna 19. The radio circuit 10 includes a control unit (unwanted radiation suppression unit, determination unit, area detection unit, transmission power detection unit, estimation unit) 11, modulation / demodulation processing unit (transmission signal output unit) 12, and power amplifier (transmission signal output unit) 13. And a spurious suppression circuit section (unnecessary radiation suppression means, attenuation means) 14 and a duplexer 18. The wireless device may further include an input / output unit, a power source, and the like (not shown).

  When the radio circuit 10 outputs the transmission signal CS in the band B (for example, LTE (uplink) 1920 to 1980 MHz) to the antenna 19, the band A different from the band B (for example, 1884.5 to be used by PHS) 1915.7 MHz) to suppress unwanted radiation.

  The transmission signal CS is modulated by the modulation / demodulation processing unit 12, amplified by the power amplifier 13, and output as an output signal to the antenna 19 via the duplexer 18 (18a). At this time, the control unit 11 controls the spurious suppression circuit unit 14 to suitably suppress unnecessary radiation generated in the band A of the output signal.

(Spurious suppression circuit)
The spurious suppression circuit unit 14 includes a switch 15, a first filter 16, and a second filter 17. The switch 15 connects nothing to the point B between the power amplifier 13 and the duplexer 18 (SW1), connects the first filter 16 (SW2), or is controlled by the control unit 11. The second filter 17 is connected (SW3). The first filter 16 is a filter (for example, a band-pass filter) that attenuates a specific frequency band, and is grounded on the side opposite to the side connected to the switch 15. The second filter 17 is a filter (for example, a bandpass filter) that attenuates a frequency band different from that of the first filter 16 and is grounded on the side opposite to the side connected to the switch 15.

  FIG. 2 is a diagram illustrating the attenuation characteristic between A and C when the switch 15 is switched. The broken line 21 indicates when nothing is connected to the point B (SW1), and the broken line 22 indicates when the first filter 16 is connected to the point B (SW2). A broken line 23 indicates when the second filter 17 is connected to the point B (SW3). As shown in FIG. 2, band A (for example, 1884.5 to 1915.7 MHz used by PHS) exists in the vicinity of the low frequency side of band B (for example, 1920 to 1980 MHz for LTE (uplink)). .

  As shown by the broken line 22, when the first filter 16 is connected to the point B, the attenuation specification between A and C is performed in the region r1 (for example, near 1915.7 MHz) on the high frequency side of the band A. ) Is greatly attenuated. Further, as indicated by the broken line 23, when the second filter 17 is connected to the point B, the attenuation specification between A and C is lower than the region that is greatly attenuated in the broken line 22. In the region r2 (for example, around 1910 MHz). On the other hand, as indicated by the broken line 21, when nothing is connected to the point B, the attenuation characteristic between A and C becomes the original characteristic of the duplexer 18, and the power reduction of the transmission signal can be avoided. That is, if the first filter 16 and the second filter 17 are ideal filters, the transmission signal in the band B is not attenuated, but the actual filter has an increased insertion loss even in the surrounding frequencies. Therefore, when the first filter 16 or the second filter 17 is connected to the point B, the power of the transmission signal is reduced.

(Control method)
Then, the control method of the radio | wireless circuit 10 by the control part 11 is demonstrated. FIG. 3 is a flowchart showing an example of the control method. As shown in FIG. 3, in the control method, a transmission signal output step of outputting a transmission signal using a part of a band in an arbitrary channel band in the first frequency band (band B) (step S106). And an unnecessary radiation suppressing step (steps S100 to S104, S108 to S114) for suppressing unnecessary radiation in the second frequency band (band A). The unnecessary radiation suppressing step includes unnecessary radiation to be suppressed. A determination step (steps S100, S102, and S108) for determining whether or not it can occur, and suppression that includes unnecessary radiation to be suppressed in the output signal when it is determined that unnecessary radiation to be suppressed can occur in the determination step. An attenuation step (steps S112 and S114) for attenuating the band signal.

  First, in step S100, the control unit 11 detects an area where the radio circuit 10 exists, and the area is in a specific country where communication using the band A is performed (for example, PHS communication is performed). If it is outside the specific country, it is determined that unnecessary radiation to be suppressed cannot be generated, and the process proceeds to step S104. For example, if the area where the radio circuit 10 exists is outside of Japan, it is not necessary to suppress unnecessary radiation in the band A, and therefore it can be determined that unnecessary radiation to be suppressed cannot occur.

  The method by which the control unit (area detection means) 11 detects the area is not particularly limited. For example, the area may be detected based on a signal received from the base station, or a GPS (Global Positioning System) (not shown). You may detect an area using. Further, the control unit 11 may determine whether or not the detected area is in a specific area instead of a specific country.

  In step S100, when it cannot be determined that unnecessary radiation that should be suppressed cannot be generated, in step S102, the control unit 11 detects the transmission power of the transmission signal CS amplified by the power amplifier 13, and transmits the transmission. It is determined whether or not the power is equal to or less than a predetermined threshold value (for example, 10 dBm per 1 RB (resource block)). The process proceeds to S104. If the transmission power of the transmission signal CS is sufficiently small, it can be determined that unnecessary radiation that should be suppressed cannot be generated because unnecessary radiation is sufficiently small even if it occurs.

  The method by which the control unit (transmission power detection means) 11 detects the transmission power of the transmission signal CS is not particularly limited. For example, the transmission power may be detected according to the control information of the power amplifier 13 or not shown. The transmission power may be detected using a transmission power monitor circuit.

  In Step S102, when it cannot be determined that unnecessary radiation that should be suppressed cannot be generated, in Step S108, the control unit 11 estimates the estimated frequency fs of unnecessary radiation, and the estimated frequency fs is determined in advance. If it is higher than the first threshold frequency fth1 (for example, 1915.7 MHz), and if it is higher than the first threshold frequency fth1, it is determined that unnecessary radiation to be suppressed cannot occur, and the step The process proceeds to S104. If the estimated frequency fs of unnecessary radiation is not applied to the band A, it can be determined that unnecessary radiation to be suppressed cannot occur. Note that the first threshold frequency fth1 may be set, for example, on the high frequency side of the band A or between the band A and the band B.

  The method by which the control unit (estimating means) 11 estimates the estimated frequency fs of unnecessary radiation is not particularly limited, but can be estimated as follows, for example. That is, as described above, since unnecessary radiation is generated by intermodulation distortion between the carrier leak CL and the transmission signal CS, the center frequency (channel frequency) f0 of the channel band of the transmission signal CS and the transmission signal CS From the frequency (particularly, the frequency f1 farthest from the center frequency f0 among the frequencies of the transmission signal CS), an estimated frequency fs at which large unnecessary radiation can occur is obtained by, for example, an expression of f0− | f0−f1 | × 3. be able to.

  In Step S108, when it cannot be determined that unnecessary radiation that should be suppressed cannot be generated, in Step S110, the control unit 11 determines that the estimated frequency fs of unnecessary radiation is the second threshold frequency fth2 (for example, 1910 MHz). Determine if it is higher. And according to the result, a switch is switched so that the signal of the suppression required band containing the estimated frequency fs may be attenuated. That is, when the estimated frequency fs is higher than the second threshold frequency fth2, the control unit 11 switches the switch 15 to SW2 that attenuates the region r1 on the higher frequency side (step S112). When the estimated frequency fs is equal to or lower than the second threshold frequency fth2, the control unit 11 switches the switch 15 to SW3 that attenuates the region r2 on the lower frequency side (step S114). Note that the second threshold frequency fth2 may be set between the region r1 and the region r2, for example.

  If the control unit (determination unit) 11 determines that unnecessary radiation to be suppressed cannot be generated, the control unit 11 sets the switch 15 to SW1 so as not to attenuate the transmission signal CS in step S104. Switch.

  In step S106, communication is performed in a state where the switch 15 is appropriately switched and unnecessary radiation is appropriately attenuated.

  FIG. 4 is a diagram illustrating an example of the frequency characteristic of the output signal in step S106, where (a) executes step S104, (b) executes step S112, and (c) executes step S114. Each example is shown below.

  As shown in FIG. 4A, when the estimated frequency fs of unnecessary radiation is within the band B and is not applied to the band A, unnecessary radiation is not generated in the band A, and the switch 15 is turned on. By switching to SW1, a decrease in transmission power can be prevented.

  Further, as shown in FIG. 4B, when the estimated frequency fs of unnecessary radiation is on the high frequency side of the band A, the signal of the corresponding suppression required band (area 1) is obtained by switching the switch 15 to SW2. Can be attenuated, and unwanted radiation can be suitably suppressed.

  Also, as shown in FIG. 4C, when the estimated frequency fs of unnecessary radiation is on the lower frequency side of the band A, the switch 15 is switched to SW3 to switch the corresponding suppression band (area 2). The signal can be attenuated to suppress unwanted radiation.

  In addition, the conditions for the control unit (determination means) 11 to determine whether or not unnecessary radiation can occur are not limited to those described above, and any of the conditions in steps S100, S102, and S108, or any arbitrary Combinations may be used, and conditions such as channel bandwidth, the number of resource blocks, and resource block arrangement may be used.

[Embodiment 2]
The following will describe another embodiment (Embodiment 2) of the present invention with reference to FIGS. FIG. 5 is a block diagram showing a main configuration of the wireless device according to the second embodiment, and shows an antenna 39 and a wireless circuit 30 connected to the antenna 39. The radio circuit 30 includes a control unit (unnecessary radiation suppression unit, determination unit, area detection unit, transmission power detection unit, estimation unit) 31, modulation / demodulation processing unit (transmission signal output unit) 32, and power amplifier (transmission signal output unit) 33. , A spurious suppression circuit section (unwanted radiation suppression means, attenuation means) 34 and a duplexer 38 are provided.

  The radio circuit 30 according to the second embodiment has the same configuration as that of the radio circuit 10 according to the first embodiment, except that the configuration and arrangement of the spurious suppression circuit unit 34 are changed.

(Spurious suppression circuit)
The spurious suppression circuit unit 34 is inserted between the power amplifier 33 and the duplexer 38, and includes a switch 35 a, a switch 35 b, a first filter 36, and a second filter 37. The switches 35a and 35b are connected directly to the power amplifier 33 and the duplexer 38 (SW1a and SW1b), connected via the first filter 36 (SW2a and SW2b), or controlled by the control unit 31. Are connected via the second filter 37 (SW3a and SW3b). The first filter 36 is a filter (for example, a high-pass filter) that slightly attenuates a specific frequency band. The second filter 37 is a filter (for example, a high-pass filter) that attenuates a specific frequency band to a greater extent than the first filter 36.

  FIG. 6 is a diagram illustrating the attenuation characteristic between C and D when the switch 35 is switched. A broken line 41 indicates when the power amplifier 33 and the duplexer 38 are directly connected (SW1a and SW1b), and a broken line 42 indicates when the power amplifier 33 and the duplexer 38 are connected via the first filter 36 (SW2a and SW1a). SW2b), and a broken line 43 indicates when the power amplifier 33 and the duplexer 38 are connected via the second filter 37 (SW3a and SW3b).

  As indicated by the broken line 42, when the power amplifier 33 and the duplexer 38 are connected via the first filter 36, the attenuation specification between C and D is slightly attenuated in the band A. Further, as indicated by the broken line 43, when the power amplifier 33 and the duplexer 38 are connected via the second filter 37, the attenuation specification between CDs is more attenuated in the band A than in the broken line 42. It is supposed to be. On the other hand, as indicated by the broken line 41, when the power amplifier 33 and the duplexer 38 are directly connected, the attenuation characteristic between A and C becomes the original characteristic of the duplexer 38, and the power reduction of the transmission signal can be avoided.

  The conditions for determining whether the control unit 31 switches the switches 35a and 35b to SW1a and SW1b or to switch to other switches can be the same as those in the first embodiment. In addition, as a condition for determining whether the control unit 31 switches the switches 35a and 35b to SW2a and SW2b or to switch to SW3a and SW3b, the estimated frequency fs of unnecessary radiation may be used. An estimation amount of the size of unnecessary radiation estimated from the above may be used.

  In any case, in the first embodiment, the spurious suppression circuit unit 14 changes the frequency band in which the signal is attenuated in the band A according to the situation, and in the second embodiment, the spurious suppression circuit unit 34 varies depending on the situation. By changing the amount of attenuation of the signal in the band A, unnecessary radiation can be suitably suppressed.

[Summary]
The radio circuit according to the first aspect of the present invention includes a transmission signal output unit (modulation / demodulation processing unit 12) that outputs a transmission signal using a part of a band within an arbitrary channel band within the first frequency band (band B). , 32, power amplifiers 13 and 33) and unnecessary radiation for suppressing unnecessary radiation in a second frequency band (band A) different from the first frequency band, which is included in the output signal from the transmission signal output means. Suppression means (control units 11 and 31, spurious suppression circuit units 14 and 34), and the unnecessary radiation suppression unit determines whether or not unnecessary radiation to be suppressed can occur. 11 and 31), and when the determination means determines that the unnecessary radiation to be suppressed can occur, an attenuation means (attenuating means) for attenuating the signal in the required suppression band including the unnecessary radiation to be suppressed in the output signal. Spria A suppression circuit 14 and 34), and a.

  According to the above configuration, when the determination unit determines that unnecessary radiation to be suppressed can occur, the attenuation unit attenuates the signal in the suppression band that includes the unnecessary radiation to be suppressed in the output signal. Unnecessary radiation generated when a transmission signal is output can be suitably suppressed.

  A radio circuit according to aspect 2 of the present invention includes, in the above aspect 1, an area detection unit (control unit 11) that detects an area where the radio circuit exists, and the determination unit includes the area detection unit. Depending on the detection result, it may be configured to determine whether or not the unwanted radiation to be suppressed can occur.

  According to said structure, since an area detection means detects an area, the determination means can determine whether the frequency band which should be suppressed can arise according to the detection result of an area detection means. This is because the frequency band that can be used by other devices (that is, the frequency band in which unnecessary radiation should be suppressed) is determined depending on the area, and there is no frequency band in which unnecessary radiation should be suppressed in the vicinity of the first frequency band. This is because unnecessary radiation that should be suppressed cannot occur when the transmission signal of the first frequency band is output. Therefore, according to said structure, the determination means can determine successfully whether the unnecessary radiation which should be suppressed can arise.

  A radio circuit according to aspect 3 of the present invention includes the transmission power detection means (control unit 11) for detecting the transmission power of the transmission signal in the aspect 1 or 2, and the determination means includes the transmission power detection. You may comprise so that the said unnecessary radiation which should be suppressed may arise according to the detection result of a means.

  According to the above configuration, since the transmission power detection unit detects the transmission power, the determination unit can determine whether or not unnecessary radiation to be suppressed can occur according to the detection result of the transmission power detection unit. it can. This is because, if the transmission power of the transmission signal is low, the unnecessary radiation that can be generated is also small, and unnecessary radiation that should be suppressed cannot be generated. Therefore, according to said structure, the determination means can determine successfully whether the unnecessary radiation which should be suppressed can arise.

  A wireless circuit according to aspect 4 of the present invention is the wireless communication circuit according to aspects 1 to 3, wherein the estimation means (control unit) 11), and the determination means may be configured to determine whether or not the unnecessary radiation to be suppressed can occur according to the estimation result of the estimation means.

  According to the above configuration, since the estimation means estimates the estimated frequency of unnecessary radiation from the center frequency of the channel band of the transmission signal and the frequency of the transmission signal, the determination means corresponds to the estimation result of the estimation detection means. It can be determined whether a frequency band to be suppressed can occur. Because first, unnecessary radiation is generated by intermodulation distortion between a carrier leak and a transmission signal. Therefore, the center frequency of the channel band of the transmission signal and the frequency of the transmission signal (particularly, among the frequencies of the transmission signal, The estimated frequency of unnecessary radiation can be estimated from the frequency farthest from the center frequency. Then, from the relationship between the estimated frequency and the frequency band (second frequency band) where unnecessary radiation should be suppressed, it can be determined whether or not unnecessary radiation can occur in the frequency band where unnecessary radiation should be suppressed. . Therefore, according to said structure, the determination means can determine successfully whether the unnecessary radiation which should be suppressed can arise.

  The wireless circuit according to aspect 5 of the present invention is the wireless circuit according to aspect 4, in which the second frequency band is on the lower frequency side than the first frequency band, and the estimation means is the center of the channel band of the transmission signal. When the frequency is f0 and the frequency farthest from f0 among the frequencies of the transmission signal is f1, the estimated frequency of the unnecessary radiation is estimated to be f0− | f0−f1 | × 3. Also good.

  According to the above configuration, the estimation means calculates the frequency of the unwanted radiation generated by the intermodulation distortion between the carrier leak and the transmission signal from f0 of the center frequency of the channel band of the transmission signal and the frequency of the transmission signal. It can be estimated successfully based on the farthest frequency.

  In the wireless circuit according to aspect 6 of the present invention, in the aspect 4 or 5, the determination unit may generate the unnecessary radiation to be suppressed when the estimated frequency of the unnecessary radiation is in a predetermined range. You may comprise so that it may determine.

  According to the above configuration, whether the unnecessary radiation to be suppressed can be generated by determining that the unnecessary radiation to be suppressed can be generated when the estimation frequency of the unnecessary radiation is in a predetermined range. Whether or not can be determined successfully.

  In the wireless circuit according to aspect 7 of the present invention, in the above aspects 4 to 6, the determination means further determines the attenuation aspect of the signal in the suppression band required according to the estimation result of the estimation means, and the attenuation The means may be configured to attenuate the signal in the suppression required band in the mode determined by the determination means.

  According to said structure, an unnecessary radiation can be suppressed suitably by attenuating the signal of a suppression zone required in the aspect according to the estimation frequency of the unnecessary radiation which the estimation means estimated.

  In the wireless circuit according to aspect 8 of the present invention, in the above aspects 1 to 7, the first frequency band is a frequency band for LTE, and the second frequency band is a frequency band for PHS. You may comprise.

  According to said structure, the radio | wireless circuit which performs radio | wireless communication by LTE in Japan can be comprised suitably.

  A wireless device according to aspect 9 of the present invention includes the wireless circuit according to any one of aspects 1 to 8.

  A radio circuit control method according to aspect 10 of the present invention includes a transmission signal output step of outputting a transmission signal using a part of a band within an arbitrary channel band within a first frequency band (band B), An unnecessary radiation suppressing step for suppressing unnecessary radiation in a second frequency band (band A) different from the first frequency band included in the output signal output in the transmission signal output step, The unnecessary radiation suppression step determines whether or not unnecessary radiation to be suppressed can occur, and when it is determined in the determination step that unnecessary radiation to be suppressed can occur, the suppression in the output signal An attenuation step of attenuating a signal in a required suppression band including unnecessary radiation to be included.

  According to said structure, there exists an effect equivalent to the radio | wireless circuit which concerns on aspect 1 of this invention.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.

  The present invention can be used in the field of manufacturing wireless devices.

10, 30 Radio circuit 11, 31 Control unit (unwanted radiation suppression means, determination means, area detection means, transmission power detection means, estimation means)
12, 32 Modulation / demodulation processing unit (transmission signal output means)
13, 33 Power amplifier (transmission signal output means)
14, 34 Spurious suppression circuit (unnecessary radiation suppression means, attenuation means)
15, 35a, 35b Switch 16, 36 First filter 17, 37 Second filter 18, 38 Duplexer 19, 39 Antenna

Claims (5)

  1. Transmission signal output means for outputting a transmission signal using a part of a band in an arbitrary channel band in the first frequency band;
    Unnecessary radiation suppression means for suppressing unnecessary radiation in a second frequency band different from the first frequency band included in the output signal from the transmission signal output means,
    The unnecessary radiation suppression means is
    Determination means for determining whether or not unnecessary radiation to be suppressed can occur;
    And attenuating means for attenuating a signal in a required suppression band including the unnecessary radiation to be suppressed in the output signal when the determination means determines that unnecessary radiation to be suppressed can occur. A featured radio circuit.
  2. Comprising an area detecting means for detecting an area where the wireless circuit is present;
    2. The radio circuit according to claim 1, wherein the determination unit determines whether or not the unnecessary radiation to be suppressed can be generated according to a detection result of the area detection unit.
  3. Comprising transmission power detection means for detecting the transmission power of the transmission signal,
    3. The radio circuit according to claim 1, wherein the determination unit determines whether or not the unnecessary radiation to be suppressed can be generated according to a detection result of the transmission power detection unit.
  4. A center frequency of a channel band of the transmission signal, and an estimation means for estimating an estimation frequency of the unnecessary radiation from the frequency of the transmission signal,
    The radio circuit according to any one of claims 1 to 3, wherein the determination unit determines whether or not the unnecessary radiation to be suppressed can be generated according to an estimation result of the estimation unit.
  5. The determination means further determines a mode of attenuation of the signal in the suppression band required according to the estimation result of the estimation means,
    The radio circuit according to claim 4, wherein the attenuation unit attenuates the signal in the suppression required band in a manner determined by the determination unit.
JP2013006741A 2013-01-17 2013-01-17 Wireless circuit Granted JP2014138330A (en)

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JP2014138330A true JP2014138330A (en) 2014-07-28

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1198030A (en) * 1997-09-18 1999-04-09 Hitachi Denshi Ltd Trasmitter
JP2011238994A (en) * 2010-04-30 2011-11-24 Ntt Docomo Inc User device and method in radio communications system
JP2012517200A (en) * 2009-02-04 2012-07-26 クゥアルコム・インコーポレイテッドQualcomm Incorporated Adjustable transmit filter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1198030A (en) * 1997-09-18 1999-04-09 Hitachi Denshi Ltd Trasmitter
JP2012517200A (en) * 2009-02-04 2012-07-26 クゥアルコム・インコーポレイテッドQualcomm Incorporated Adjustable transmit filter
JP2011238994A (en) * 2010-04-30 2011-11-24 Ntt Docomo Inc User device and method in radio communications system

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