WO2009139099A1 - 携帯無線機 - Google Patents
携帯無線機 Download PDFInfo
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- WO2009139099A1 WO2009139099A1 PCT/JP2009/000752 JP2009000752W WO2009139099A1 WO 2009139099 A1 WO2009139099 A1 WO 2009139099A1 JP 2009000752 W JP2009000752 W JP 2009000752W WO 2009139099 A1 WO2009139099 A1 WO 2009139099A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0848—Joint weighting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
- H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
- H04B7/0814—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching based on current reception conditions, e.g. switching to different antenna when signal level is below threshold
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0868—Hybrid systems, i.e. switching and combining
- H04B7/0871—Hybrid systems, i.e. switching and combining using different reception schemes, at least one of them being a diversity reception scheme
Definitions
- the present invention relates to a portable wireless device.
- a portable high-frequency receiving device having a changeover switch for switching is known (see, for example, Patent Document 1).
- This receiving device can supply a high-frequency broadcast signal supplied from a fixed antenna with good reception sensitivity to the high-frequency signal input terminal, so that the signal level is low when receiving with the built-in antenna, etc.
- TV it is possible to satisfactorily receive TV broadcasts.
- the receiving apparatus includes a first amplifier and a second amplifier.
- the signal input from the high-frequency signal input terminal is a signal that causes distortion in the amplifier
- the control unit turns off the second amplifier.
- the amplifier can attenuate the input signal, the distortion characteristics when receiving a signal with a strong input level are improved, and the distortion of the signal is reduced.
- the antenna gain is lower in the case of using two built-in antennas than in the case of using a whip antenna or an external antenna protruding outside. turn into.
- it assumes that only the high frequency signal from one of a built-in antenna and an external antenna is input, and does not assume inputting simultaneously from both antennas.
- the signal intensity of the signal input to the low-noise amplifier is higher than a predetermined value when a strong electric field is input. The desired reception process may not be performed.
- the present invention has been made in view of the above-described conventional circumstances, and an object of the present invention is to provide a portable wireless device that can simultaneously input high-frequency signals from a plurality of built-in antennas and perform optimal reception processing. Yes.
- the portable wireless device of the present invention includes a first built-in antenna that receives a high-frequency signal, a first low-noise amplifier that amplifies a signal from the first built-in antenna, and a signal from the first low-noise amplifier.
- a first receiving unit for performing predetermined reception processing, a second built-in antenna that receives a high-frequency signal and has a gain lower than that of the first built-in antenna, and a signal from the second built-in antenna A second low-noise amplifier to be amplified, a second receiving unit for performing a predetermined receiving process on the signal from the second low-noise amplifier, a receiving process by the first receiving unit, and the second receiving unit
- a reception circuit unit that performs predetermined diversity processing on the signal received and processed by the first receiving unit and the signal received and processed by the second receiving unit when receiving processing is performed by the receiving unit; .
- the first built-in antenna and the second built-in antenna receive television signals.
- This configuration makes it possible to receive television signals from two antennas and perform optimum reception processing, and to watch television with high image quality and high sound quality.
- the portable wireless device of the present invention is calculated by the signal combining unit that combines the signal output from the first receiving unit and the signal output from the second receiving unit, and the signal combining unit.
- BER Bit Error rate
- C / N Carrier to Noise ratio
- the C / N calculated from the signal input to the first receiver, the C / N calculated from the signal input to the second receiver, and these two signals are combined Based on the BER output from the signal synthesizer, it is determined whether or not to perform reception processing (tuning processing and demodulation processing) in each reception system, so that it is possible to perform optimal reception processing. . Thereby, for example, television viewing with high image quality and high sound quality becomes possible.
- the C / N calculated by the first receiving unit when it is smaller than the C / N calculated by the second receiving unit, control is performed so that the receiving process by the first receiving unit is stopped and the receiving process by the second receiving unit is performed.
- the C / N calculated by the second receiving unit when the BER calculated by the signal combining unit is smaller than a predetermined value, the C / N calculated by the second receiving unit When the C / N calculated by one receiving unit is deteriorated, the receiving process by the first receiving unit is performed, and the receiving process by the second receiving unit is controlled to be stopped.
- reception electric field is a medium electric field
- a desired reception process can be performed in a reception system including a high gain antenna and a reception system including a low gain antenna.
- sufficient signal strength as a received signal can be obtained by only receiving processing in any of the receiving systems.
- the reception control unit when the BER calculated by the signal combining unit is larger than a predetermined value, the reception control unit receives the reception process by the first receiving unit and the reception by the second receiving unit. Control to perform processing.
- the signal strength of the signal input to the receiving unit is not sufficient for both the receiving system including the antenna having a high gain and the receiving system including the antenna having a low gain.
- the portable wireless device includes a first circuit board disposed in the first housing and a second circuit board disposed in the second housing.
- the first built-in antenna is a dipole antenna including at least a part of the first circuit board and the second circuit board, and the second built-in antenna is disposed in the first casing or in the first case.
- 2 is an antenna element disposed in the housing 2.
- a high frequency signal is simultaneously input from a plurality of built-in antennas by using the first built-in antenna as a case dipole antenna by the case of the portable radio device and the second built-in antenna as an antenna element built in the case. It is possible to perform an optimal reception process.
- the portable wireless device includes a circuit board disposed in a housing, and the first built-in antenna and the second built-in antenna are opposed to each other through the circuit board. It is the antenna element arrange
- the first built-in antenna is used as an antenna element built in the housing
- the second built-in antenna is used as an antenna element built in the housing. Reception processing can be performed.
- the two internal antennas are arranged at positions facing each other with the circuit board interposed therebetween, electromagnetic coupling between the antennas is reduced, and a good antenna gain can be secured.
- wireless machine in embodiment of this invention The figure which shows an example of the relationship between the received electric field and BER in embodiment of this invention.
- a portable wireless device for example, a mobile phone terminal, a personal digital assistant (PDA), a portable television receiver, and the like are conceivable.
- PDA personal digital assistant
- FIG. 1 is a diagram showing an example of the configuration of the portable wireless device 1 according to the first embodiment of the present invention.
- a portable wireless device 1 shown in FIG. 1 includes two housings, an upper portion and a lower portion, and is formed in two directions (short direction) and vertical direction (longitudinal direction) by two hinge portions 102 and 103 made of conductive members. It can be opened and closed in two directions.
- FIG. 1 is an example of a case in which it is opened in the horizontal direction.
- the lower housing 104 is provided with a circuit board 106
- the upper housing 105 is provided with a circuit board 112.
- a feeding element 110 provided in the lower housing 104 has one end portion electrically connected to the hinge portion 103 and the other end portion electrically connected to the hinge portion 102.
- the antenna element 111 provided in the upper housing 105 is electrically connected to the hinge portion 102.
- the antenna element 111 is a metal frame that forms part of the upper housing 105.
- a dipole antenna is formed in which the feeding element 110, the hinges 102 and 103 are feeding elements to the upper element, 111 is the upper element, and the ground pattern of the circuit board 106 of the lower casing 104 is the lower element.
- the whole body is used as an antenna (casing dipole antenna).
- the case dipole antenna is a built-in antenna 10 ⁇ / b> A including at least a part of the circuit board 112 provided in the upper case 105 and the circuit board 106 provided in the lower case 104.
- a built-in antenna 10B is provided at a position facing the built-in antenna 10A via the circuit board 106.
- the built-in antenna 10 ⁇ / b> B is a built-in antenna element built in the lower housing 104 and is electrically connected to the circuit board 106.
- the built-in antenna 10B has a lower gain than the built-in antenna 10A.
- the built-in antenna 10B may be a dipole antenna or a monopole antenna.
- the built-in antenna 10 is an antenna for receiving a high frequency signal, for example, an antenna for receiving a digital television signal of 470 MHz to 770 MHz.
- the built-in antenna 10 may function as a cellular antenna when using a telephone function.
- the circuit board 106 includes a power feeding unit 121 (first power feeding unit 121A and second power feeding unit 121B), an LNA (Low Noise Amplifier) 122 (first LNA 122A and second LNA 122B), and reception.
- a circuit unit 123 is provided.
- the hinge portion 103 is electrically connected to one end (input end) of the power feeding portion 121A.
- the other end (output end) of the power feeding unit 121A is electrically connected to one end (input end) of the LNA 122A.
- the other end (output end) of the LNA 122A is electrically connected to one end of the receiving circuit unit 123.
- the built-in antenna 10B is electrically connected to one end (input end) of the power feeding unit 121B.
- the other end (output end) of the power feeding unit 121B is electrically connected to one end (input end) of the LNA 122B.
- the other end (output end) of the LNA 122B is connected to the other end of the receiving circuit unit 123.
- the power feeding unit 121 feeds power to the built-in antenna 10, the power feeding unit 121A feeds power to the built-in antenna 10A, and the power feeding unit 121B feeds power to the built-in antenna 10B.
- the power feeding unit 121A also has a function as a matching unit that matches the impedance on the power feeding unit 121A side of the upper element of the built-in antenna 10A with the input impedance of the LNA 122A.
- the power feeding unit 121B also has a function as a matching unit that matches the impedance of the built-in antenna 10B on the power feeding unit 121B side with the input impedance of the LNA 122B.
- the LNA 122 amplifies the high frequency signal from the built-in antenna 10, the LNA 122A amplifies the signal from the built-in antenna 10A, and the LNA 122B amplifies the signal from the built-in antenna 10B.
- the receiving circuit unit 123 includes a first receiving unit 124A, a second receiving unit 124B, a reception control unit 125, and a signal synthesis unit 126, as shown in FIG.
- FIG. 2 is a diagram illustrating an example of a detailed configuration of the reception circuit unit 123.
- One end (input end) of the first receiving unit 124A is electrically connected to the other end of the LNA 122A.
- the other end of the first receiving unit 124A is connected to one end (input end) of the signal combining unit.
- one end (output end) of the second receiving unit 124B is electrically connected to the other end of the LNA 122B.
- the other end of the second receiving unit 124B is connected to one end (another input end) of the signal combining unit.
- one end (output end) of the signal synthesis unit is connected to one end (input end) of the reception control unit 125.
- the reception unit 124 (124A and 124B) operates in response to a circuit control signal described later sent from the reception control unit 125 to the reception unit when a predetermined condition is satisfied, and receives a signal (amplified signal) amplified by the LNA 122. I do. That is, the reception unit 124A performs reception processing on the amplified signal from the LNA 122A, and the reception unit 124B performs reception processing on the amplified signal from the LNA 122B. In the reception process, for example, a tuning process for selecting a frequency band signal used in the DTV from the amplified signal, a demodulation process for demodulating a signal in the frequency band selected by the tuning process, and the like are performed.
- the reception unit 124 calculates C / N (Carrier to Noise ratio) based on the result of the reception process. That is, the receiving unit 124A calculates C / N based on the reception process for the amplified signal input from the LNA 122A. In addition, the reception unit 124B calculates C / N based on the reception process for the amplified signal input from the LNA 122B.
- C / N is the ratio of carrier to noise for the signal input from the LNA, and the larger the value, the better the state.
- the signal synthesis unit 126 synthesizes the signal from the reception unit 124A and the signal from the reception unit 124B, and based on the synthesized signal, shows a bit error rate that is one of the communication signal qualities. (Error rate) is calculated.
- the reception control unit 125 generates a circuit control signal based on the BER calculated by the signal synthesis unit 126 and the C / N calculated by each reception unit 124, and transmits the circuit control signal to the reception unit.
- the circuit control signal is a control signal for instructing the receiving unit whether to stop the operation of the receiving unit.
- reception unit 124 performs reception processing is determined based on the BER calculated based on the signal input to the signal synthesis unit 126 and the amplification input to the first reception unit 124A. It is determined based on the C / N of the signal and the C / N of the amplified signal input to the second receiving unit 124B.
- the reception circuit unit 123 performs diversity processing on the received signal (received signal). Diversity processing combines each received signal with the same phase, combines diversity processing to generate a combined signal, calculates the C / N of each received signal, and selects one of the received signals based on the calculation result A selection diversity process is performed.
- the electrical paths of the internal antenna 10A, the power feeding unit 121A, the LNA 122A, and the first receiving unit 124A that are electrically connected are referred to as a first path
- the internal antenna 10B, the power feeding unit 121B, the LNA 122B, and the second The electrical path of the receiving unit 124B is referred to as a second path.
- FIG. 3 shows the magnitude of the received electric field and the BER of the reception process by the signal combining unit 126.
- the received electric field indicates the electric field strength at the place where the portable wireless device 1 is placed.
- the reception electric field includes a strong electric field, a medium electric field, and a weak electric field.
- the strong electric field is a portion where the BER calculated by the signal combining unit 126 is equal to or greater than a predetermined value and the BER value is deteriorated (that is, becomes larger) as the electric field becomes stronger.
- the weak electric field is a portion where the BER calculated by the signal combining unit 126 is equal to or greater than a predetermined value, and the electric field strength is such that the BER value deteriorates as the electric field becomes weaker.
- the middle electric field refers to the case of the electric field strength between the strong electric field and the weak electric field.
- the operations (such as reception processing) of the first receiving unit 124A and the second receiving unit 124B are different.
- the received electric field is a strong electric field
- the LNA 122A itself is distorted or amplified by the signal amplified by the LNA 122A. Distortion occurs in the first receiving unit.
- the received electric field is f1
- the C / N in the first receiving unit 124A is good, but when the received electric field is f1 or more, the first electric field increases as the received electric field increases. Errors in the receiving process by the receiving unit 124A increase, and the C / N in the first receiving unit 124A deteriorates.
- the gain of the built-in antenna 10B is 10A. Therefore, the amplified signal output from the LNA 122B has been subjected to normal amplification processing based on the high frequency signal. For this reason, when the reception electric field is f1 or more than f1, there is almost no error in reception processing by the second reception unit 124B, and the C / N in the second reception unit 124B is good (large ) Value.
- the received electric field is a strong electric field, for example, even if the C / N in the first path is deteriorated, the C / N in the second path is good.
- the value of BER is small.
- both the first reception component 124A and the second reception unit 124B perform the next reception process.
- the reception circuit unit 123 performs diversity processing to ensure good reception characteristics.
- the reception electric field is a medium electric field
- the received electric field is a medium electric field
- the received electric field is not less than the second predetermined value (f2 in FIG. 3) and less than the first predetermined value (f1 in FIG. 3)
- the amplified signals output from the LNA 122A and the LNA 122B are obtained by performing normal amplification processing based on the high frequency signal. For this reason, the C / N of the reception process by the first reception unit 124A is a good value.
- the received electric field is a medium electric field, that is, when the received electric field is not less than the second predetermined value (f2 in FIG. 3) and less than the first predetermined value (f1 in FIG. 3)
- the amplified signal output from the LNA 122B has almost no error in reception processing by the second receiving unit 124B, and has been subjected to normal amplification processing based on the high-frequency signal. For this reason, the C / N of the reception processing by the second reception unit 124B is a good value.
- the C / N is good in both the first path and the second path, and the BER value calculated by the signal synthesis unit 126 is a good value.
- the processing in the first route or the processing in the second route is sufficient.
- either one of the first reception unit 124A or the second reception unit 124B (for example, the one with better C / N) performs the next reception process, and the other does not perform the next reception process.
- the reception electric field is a medium electric field
- the operation of the receiving unit may be stopped without performing C / N calculation in the receiving unit that does not perform the next reception process. Thereby, the processing load of the portable wireless device 1 is reduced.
- the received electric field is a weak electric field
- the radio wave is normally received by the built-in antenna 10A when the received electric field is near f2.
- the smaller the received electric field is the higher the possibility that radio wave reception will fail.
- the received electric field is f2
- the BER value calculated by the signal combining unit 126 is close to 0, but when the received electric field is less than f2, the magnitude of the received electric field decreases. Errors in reception processing by the first reception unit 124A increase, and the C / N in the first reception unit 124A becomes a degraded value.
- the radio wave is normally transmitted by the built-in antenna 10A when the received electric field is near f2.
- the received electric field becomes smaller than f2
- the received electric field is f2
- the BER value calculated by the signal combining unit 126 is close to 0.
- the received electric field is less than f2
- the BER value is smaller as the received electric field becomes smaller.
- the number of reception processing errors by the second receiving unit 124B increases, and the C / N in the second receiving unit 124B becomes a degraded value.
- the first reception unit 124A and the second reception unit 124B perform the next reception process.
- the reception circuit unit 123 performs diversity processing to ensure good reception characteristics.
- the switching of the operation of the reception process is based on the BER value obtained by the previous reception process calculated by the signal synthesis unit 126.
- the reception control unit 125 operates both the first reception unit and the second reception unit.
- the first receiving unit and the second receiving unit respectively measure C / N, and the reception control unit 125 compares the respective C / N, As a result of the comparison, only the receiving unit whose good C / N is measured is operated from the next time.
- the reception control unit 125 compares the C / N in the first reception unit 124A and the C / N in the second reception unit 124B, and ends the reception process in the reception unit with the worse C / N.
- the reception control unit 125 When the medium electric field changes to a strong electric field, that is, when it is determined that the BER value calculated by the signal combining unit 126 has changed from less than the predetermined BER value to more than the predetermined BER value, the reception control unit 125 The reception processing in the receiving unit 124A and the second receiving unit 124B is started.
- the reception control unit 125 compares the C / N in the first reception unit 124A and the second reception unit 124B, and ends the reception process in the inferior reception unit.
- the reception control unit 125 performs the first control. The reception processing in the receiving unit 124A and the second receiving unit 124B is started.
- Such a portable wireless device 1 can simultaneously input high-frequency signals from a plurality of built-in antennas 10A and 10B and perform optimum reception processing.
- FIG. 4 is a diagram illustrating an example of the configuration of the portable wireless device according to the second embodiment of the present invention.
- the built-in antenna 10A is a built-in antenna element that operates as a monopole antenna or a dipole antenna.
- the built-in antenna element 10B is a built-in antenna element that operates as a monopole antenna or a dipole antenna, as in FIG.
- the built-in antenna 10A and the built-in antenna 10B are disposed at positions facing each other through the circuit board 106 of the lower housing 104.
- the power feeding unit 121 feeds power to the built-in antenna 10, the power feeding unit 121A feeds power to the built-in antenna 10A, and the power feeding unit 121B feeds power to the built-in antenna 10B.
- the power feeding unit 121A also has a function as a matching unit that matches the impedance on the power feeding unit 121A side of the built-in antenna 10A and the input impedance of the LNA 122A.
- the power feeding unit 121B also has a function as a matching unit that matches the impedance of the built-in antenna 10B on the power feeding unit 121B side with the input impedance of the LNA 122B.
- a portable wireless device 1B it is possible to simultaneously input high frequency signals from a plurality of built-in antennas 10A and 10B and perform an optimal reception process.
- the present invention is useful for a portable wireless device or the like that can simultaneously input high-frequency signals from a plurality of built-in antennas and perform optimum reception processing.
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Abstract
Description
10A、10B 内蔵アンテナ
102、103 ヒンジ部
104 下部筐体
105 上部筐体
106、112 回路基板
110、111 給電素子
121A 第1の給電部
121B 第2の給電部
122A 第1の低雑音増幅器(LNA)
122B 第2の低雑音増幅器(LNA)
123 受信回路部
124A 第1の受信部
124B 第2の受信部
125 受信制御部
126 信号合成部
図1は本発明の第1の実施形態の携帯無線機1の構成の一例を示す図である。図1に示す携帯無線機1は、上部と下部の2つの筐体を備え、導電性部材からなる2つのヒンジ部102、103により、横方向(短手方向)と縦方向(長手方向)の2方向に開閉自在となっている。図1は横方向に開いた場合の一例である。下部筐体104には回路基板106が設けられており、上部筐体105には回路基板112が設けられている。下部筐体104に設けられる給電素子(例えばアンテナ素子)110は、一方の端部がヒンジ部103に電気的に接続され、他方の端部がヒンジ部102に電気的に接続されている。上部筐体105に設けられるアンテナ素子111は、ヒンジ部102に電気的に接続されている。アンテナ素子111は、上部筐体105の一部を構成する金属フレームである。給電素子110、ヒンジ部102、103が上側素子への給電素子で、111が上側素子、また下部筐体104の回路基板106のグラウンドパターンが下側素子となるダイポールアンテナを形成しており、筐体全体をアンテナ(筐体ダイポールアンテナ)として利用する。このように、上記筐体ダイポールアンテナは、上部筐体105に配設された回路基板112および下部筐体104に配設された回路基板106の少なくとも一部を含む内蔵アンテナ10Aである。
また、信号合成部126は、受信部124Aからの信号と受信部124Bからの信号とを合成し、その合成された信号に基づいて通信信号品質の1つであるビット誤り率を示すBER(Bit Errorrate)を算出する。
また、受信制御部125は、信号合成部126によって算出されたBERおよび各受信部124によって算出されたC/Nに基づいて、回路制御信号を生成し、受信部へ回路制御信号を送信する。なお、回路制御信号は、受信部に対し、受信部の動作を停止するか否かを指示するための制御信号である。
図3は、受信電界の大きさと信号合成部126による受信処理のBERを示している。ここでは、受信電界とは、この携帯無線機1が置かれている場所における電界強度を指すものである。受信電界としては、強電界、中電界、弱電界がある。強電界とは、信号合成部126によって算出されたBERが所定値以上になる部分であり、かつ電界が強くなるに従ってBERの値が劣化する(つまり大きくなる)電界強度の場合を指す。また、弱電界とは、信号合成部126によって算出されたBERが所定値以上になる部分であり、かつ電界が弱くなるに従ってBERの値が劣化する電界強度の場合を指す。中電界とは、上記強電界と弱電界の間の電界強度の場合を指す。受信電界の大きさに応じて、第1の受信部124Aおよび第2の受信部124Bの動作(受信処理など)が異なる。
第1経路においては、受信電界が強電界の場合、つまり、受信電界が第1の所定値(図3におけるf1)以上である場合には、LNA122A自体が歪む、もしくはLNA122Aで増幅された信号により第1の受信部に歪みが生じてしまう。このため、受信電界がf1である場合には第1の受信部124AにおけるC/Nは良好であるが、受信電界がf1以上である場合には、受信電界の大きさが大きくなるにつれて第1の受信部124Aによる受信処理の誤りが増加し、第1の受信部124AにおけるC/Nが劣化する。
第1経路においては、受信電界が中電界の場合、つまり、受信電界が第2の所定値(図3におけるf2)以上かつ第1の所定値(図3におけるf1)未満である場合には、LNA122AおよびLNA122Bから出力される増幅信号は、高周波信号に基づいて正常な増幅処理が行われたものとなる。このため、第1の受信部124Aによる受信処理のC/Nは良好な値となる。
第1経路においては、受信電界が弱電界の場合、つまり、受信電界が第2の所定値(図3におけるf2)未満である場合、受信電界がf2付近では内蔵アンテナ10Aにより電波を正常に受電するが、受信電界がf2よりも小さくなるほど、電波の受信に失敗する可能性が高くなる。このため、受信電界がf2である場合には、信号合成部126によって算出されるBER値は0付近であるが、受信電界がf2未満である場合には、受信電界の大きさが小さくなるにつれて第1の受信部124Aによる受信処理の誤りが増加し、第1の受信部124AにおけるC/Nは劣化した値となる。
図4は、本発明の第2の実施形態の携帯無線機の構成の一例を示す図である。図4に示す携帯無線機1Bでは、内蔵アンテナ10Aは、モノポールアンテナもしくはダイポールアンテナとして動作する内蔵アンテナ素子である。内蔵アンテナ素子10Bは、図1と同様に、モノポールアンテナもしくはダイポールアンテナとして動作する内蔵アンテナ素子である。内蔵アンテナ10Aと内蔵アンテナ10Bとは、下部筐体104の回路基板106を介して対向する位置に配設されている。内蔵アンテナ10A、給電部121A、LNA122A、受信回路部123に含まれる図示しない第1の受信部124Aで構成される第1経路、および、内蔵アンテナ10B、給電部121B、LNA122B、受信回路部123に含まれる図示しない第2の受信部124Bで構成される第2経路については、電気的な接続関係は図1と同じである。
本出願は、2008年5月12日出願の日本特許出願No.2008-124332に基づくものであり、その内容はここに参照として取り込まれる。
Claims (8)
- 高周波信号を受信する第1の内蔵アンテナと、
前記第1の内蔵アンテナからの信号を増幅する第1の低雑音増幅器と、
前記第1の低雑音増幅器からの信号について所定の受信処理を行うための第1の受信部と、
高周波信号を受信し、前記第1の内蔵アンテナよりも利得が低い第2の内蔵アンテナと、
前記第2の内蔵アンテナからの信号を増幅する第2の低雑音増幅器と、
前記第2の低雑音増幅器からの信号について所定の受信処理を行うための第2の受信部と、
前記第1の受信部による受信処理および前記第2の受信部による受信処理が行われた場合、前記第1の受信部によって受信処理された信号および前記第2の受信部によって受信処理された信号について所定のダイバーシチ処理を行う受信回路部と、
を備える携帯無線機。 - 請求項1に記載の携帯無線機であって、
前記第1の内蔵アンテナおよび前記第2の内蔵アンテナは、テレビ信号を受信する
携帯無線機。 - 請求項1または2のいずれか1項に記載の携帯無線機であって、更に、
前記第1の受信部から出力された信号と、前記第2の受信部から出力された信号とを合成する信号合成部と、
前記信号合成部によって算出される前記合成された信号のBER(Bit Error rate)と、前記第1の受信部によって算出される前記受信処理のC/N(Carrier to Noise ratio)と、前記第2の受信部によって算出される前記受信処理のC/Nとに基づいて、前記第1の受信部による受信処理および前記第2の受信部による受信処理を行うか否かを決定する受信制御部と、
を備える携帯無線機。 - 請求項3に記載の携帯無線機であって、
前記受信制御部は、信号合成部によって算出されるBERが所定値よりも小さい場合、かつ、前記第1の受信部によって算出されるC/Nが前記第2の受信部によって算出されるC/Nよりも小さい場合、前記第1の受信部による受信処理を停止し、かつ、前記第2の受信部による受信処理を行うよう制御する
携帯無線機。 - 請求項3に記載の携帯無線機であって、
前記受信制御部は、信号合成部によって算出されるBERが所定値よりも小さい場合、かつ、前記第2の受信部によって算出されるC/Nが前記第1の受信部によって算出されるC/Nに対して劣化している場合、前記第1の受信部による受信処理を行い、かつ、前記第2の受信部による受信処理を停止するよう制御する
携帯無線機。 - 請求項3に記載の携帯無線機であって、
前記受信制御部は、信号合成部によって算出されるBERが所定値よりも大きい場合、前記第1の受信部による受信処理および前記第2の受信部による受信処理を行うよう制御する
携帯無線機。 - 請求項1ないし6のいずれか1項に記載の携帯無線機であって、
当該携帯無線機は、第1の筐体内に配設された第1の回路基板と、第2の筐体内に配設された第2の回路基板とを備え、
前記第1の内蔵アンテナは、前記第1の回路基板および前記第2の回路基板の少なくとも一部を含むダイポールアンテナであり、
前記第2の内蔵アンテナは、前記第1の筐体内または第2の筐体内に配設されたアンテナ素子である
携帯無線機。 - 請求項1ないし6のいずれか1項に記載の携帯無線機であって、
当該携帯無線機は、筐体内に配設された回路基板を備え、
前記第1の内蔵アンテナおよび前記第2の内蔵アンテナは、前記回路基板を介して対向する位置に配設されたアンテナ素子である
携帯無線機。
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US12/992,234 US20110065404A1 (en) | 2008-05-12 | 2009-02-20 | Portable radio |
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JP2008124332A JP2009273085A (ja) | 2008-05-12 | 2008-05-12 | 携帯無線機 |
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