JPWO2008038380A1 - Wireless communication device - Google Patents

Abstract

A wireless communication device that can simultaneously operate various terminal applications using wireless communication with a simple configuration. The wireless communication device (100) includes a plurality of antennas (101a, 101b, 101c, 101d) and a wireless system A and the wireless system for signals in frequency bands f0 to f3 transmitted / received via the plurality of antennas. A first receiving unit (103) serving as a first radio unit for sharing radio processing of a radio system B having a frequency band higher than A, and signals in frequency bands f2 to f5 transmitted / received via the plurality of antennas And transmitting and receiving via the plurality of antennas with the second receiving unit (104) serving as a second radio unit for sharing radio processing between the radio system B and the radio system C having a higher frequency band than the radio system B. The radio system C and the radio system D having a higher frequency band than the radio system C are assigned to the signals in the frequency bands f4 to f7. The third receiver of the radio section (105) comprises a.

Description

  The present invention relates to a wireless communication apparatus such as a mobile phone that supports multimode / multiband.

  As shown in FIG. 7, this type of wireless communication device 10 includes a transmitter 11, a receiver 12, an antenna sharing unit 13, an antenna 14, and the like.

  In FIG. 7, the transmitter 11 converts an audio signal or a data signal that is transmission information into a transmission signal, and outputs the converted transmission signal to the antenna sharing unit 13.

  The antenna sharing unit 13 transmits the transmission signal input from the transmitter 11 through the antenna 14 as a transmission wave in a predetermined frequency band.

  On the other hand, the receiver 12 converts a reception signal of a predetermined frequency band received via the antenna 14 and the antenna sharing unit 13 into reception information such as an audio signal and a data signal and outputs the reception information.

  By the way, in this kind of wireless communication apparatus, cellular multi-band (Standard) such as 3GPP specifications, 3GPP-LTE specifications, GSM / EDGE is standard.

  Also, this type of wireless communication device needs to be multi-mode, such as compatible with international roaming.

  In addition, this type of wireless communication device (portable terminal) includes various terminals using various wireless resources such as wireless LAN (WLAN), Bluetooth (BT), digital television (DTV), GPS, and RF tag. Applications are starting to be installed.

  Also, in this type of wireless communication apparatus, a technique for improving wireless performance using a plurality of wireless circuits such as diversity and MIMO communication has become common.

  2. Description of the Related Art Conventionally, a wireless communication device having a configuration capable of receiving signals in different frequency bands with one system of diversity reception is known (see Patent Document 1).

In such a wireless communication apparatus compatible with, for example, the WCDMA compressed mode, it is not necessary to mount wireless units for different wireless systems and frequencies, so that the cost can be reduced and the size can be reduced.
JP 2005-229539 A

  However, the conventional wireless communication apparatus has one wireless unit when a response frequency band for simultaneously operating various terminal applications using wireless such as a multiband / multimode cellular system, a wireless LAN, and a digital television is increased. Broadband and wide tunable are required.

  For this reason, in the conventional wireless communication device, it is difficult to ensure stable communication performance due to an increase in current consumption and deterioration in communication performance due to NF / distortion.

  An object of the present invention is to provide a wireless communication apparatus that can simultaneously operate various terminal applications using wireless communication with a simple configuration.

  The wireless communication apparatus of the present invention includes a plurality of antennas and a second wireless system having a frequency band higher than that of the first wireless system and a signal transmitted / received via the plurality of antennas. A first wireless unit that shares wireless processing of the second wireless system and a third wireless that has a higher frequency band than the second wireless system and a signal that is transmitted and received via the plurality of antennas. A second wireless unit that shares wireless processing of the system.

  According to the present invention, since the radio circuit is shared, the size can be reduced. In addition, a plurality of different wireless systems and diversity can be operated simultaneously. Furthermore, since the frequency band that can be handled by one radio unit can be narrowed, the basic characteristics are improved even with a small current.

1 is a block diagram showing a configuration of a receiver of a wireless communication apparatus according to Embodiment 1 of the present invention. The figure which shows the frequency corresponding to each radio | wireless system of the radio | wireless communication apparatus which concerns on Embodiment 1 of this invention. The block diagram which shows the structural example of the receiving part of the receiver of the radio | wireless communication apparatus which concerns on Embodiment 1 of this invention. FIG. 3 is a block diagram showing a configuration of a receiver of a wireless communication apparatus according to Embodiment 2 of the present invention. FIG. 4 is a block diagram showing a configuration of a receiver of a wireless communication apparatus according to Embodiment 3 of the present invention. FIG. 7 is a block diagram showing a configuration of a receiver of a wireless communication apparatus according to Embodiment 4 of the present invention. The block diagram which shows schematic structure of a radio | wireless communication apparatus

  Hereinafter, a wireless communication apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the component and equivalent part which have the same structure or function, and the description is not repeated.

  The present invention is characterized in that the corresponding frequency bands of a plurality of radio units overlap, but have different bands, and the overlapping frequency regions can be utilized for diversity communication and MIMO communication.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of a receiver of the wireless communication apparatus according to Embodiment 1 of the present invention. FIG. 2 is a diagram showing frequencies corresponding to each wireless system of the wireless communication apparatus according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the receiver 100 of this example includes antennas 101a, 101b, 101c, and 101d, an antenna sharing unit 102, a first receiving unit 103, a second receiving unit 104, a third receiving unit 105, and a signal processing unit. 106 and a control unit 107.

  In FIG. 1, antennas 101a, 101b, 101c, and 101d are connected to the antenna sharing unit 102 and receive transmission waves in frequency bands corresponding to the antennas.

  The antenna sharing unit 102 includes a first receiving unit 103, a first receiving unit 103 corresponding to a wireless system that operates the reception signals of the respective bands received by the antennas 101a, 101b, 101c, and 101d based on the control signal of the control unit 107. 2 selectively output to the receiving unit 104 and the third receiving unit 105.

  Here, as shown in FIG. 2, the first receiving unit 103 has a frequency corresponding to the wireless system A and the wireless system B such as digital television broadcasting and cellular communication among the received signals input from the antenna sharing unit 102. A receiving circuit corresponding to f0 to f3 for receiving a reception signal in a band is provided.

  In addition, the second receiving unit 104 receives the received signals in the frequency bands corresponding to the wireless system B and the wireless system C such as cellular communication and Bluetooth among the received signals input from the antenna sharing unit 102, f2 to f5. A corresponding receiving circuit is provided.

  Further, the third reception unit 105 receives, from among the reception signals input from the antenna sharing unit 102, reception signals in a frequency band corresponding to the wireless system C and the wireless system D such as Bluetooth and wireless LAN, f4 to f7. A corresponding receiving circuit is provided.

  FIG. 3 shows a configuration example of the receiving circuits of the first receiving unit 103, the second receiving unit 104, and the third receiving unit 105.

  As shown in FIG. 3, the receiving circuit of each receiving unit 103, 104, 105 includes an RF filter 110, a low noise amplifier (LNA) 111, a local oscillator 112, a quadrature demodulator 113, low pass filters (LPF) 114a, 114b, AD converters (ADC) 115a and 115b are provided.

  In FIG. 3, the RF (band) filter 110 outputs the received signal input from the antenna sharing unit 102 to the low noise amplifier 111 only through the received signal in the frequency band corresponding to the preset wireless system.

  The low noise amplifier 111 amplifies the received signal in the frequency band corresponding to the preset wireless system input from the RF filter 110 and outputs the amplified signal to the quadrature demodulator 113.

  The quadrature demodulator 113 performs quadrature demodulation on the signal output from the low noise amplifier 111 based on a predetermined oscillation frequency signal given from the local oscillator 112 according to the reception frequency, and the quadrature demodulated I component signal and Q component signal Output to the low-pass filters 114a and 114b, respectively.

  The low-pass filters 114a and 114b control the bandwidth of the I component signal and the Q component signal input from the quadrature demodulator 113, and output the I component signal and the Q component signal of a desired bandwidth to the AD converters 115a and 115b, respectively. To do.

  The AD converters 115a and 115b perform A / D conversion on I component signals and Q component signals having desired bandwidths input from the low pass filters 114a and 114b, and convert the I component signals and Q component signals converted into digital signals into signal processing units. It outputs to 106 (refer FIG. 1).

  The signal processing unit 106 receives the I and Q component signals input from the AD converters 115a and 115b of the receiving circuits and the control signal input from the control unit 107, and receives the receiving units 103, 104, Processing for operating the wireless system corresponding to the reception frequency 105 is performed.

  For example, as will be described later, the signal processing unit 106 views DTV at the first receiving unit 103 and performs diversity communication and MIMO operation in the overlapping frequency band between the second receiving unit 104 and the third receiving unit 105. To process.

  The control unit 107 controls the processing operations of the antenna sharing unit 102 and the signal processing unit 106 according to the wireless system operated by the receiver 100 of this example.

  As described above, the receiver 100 of this example is set such that the corresponding frequency bands of the first receiving unit 103, the second receiving unit 104, and the third receiving unit 105 overlap each other.

  As described above, the receiver 100 of the present example includes the plurality of receiving units 103, 104, and 105 having different corresponding frequency bands set so that some frequency bands overlap with each other. A plurality of wireless systems using a band can be received simultaneously.

  For example, in the receiver 100 of this example, the corresponding frequency of the first receiving unit 103 is set to 470 MHz to 2.2 GHz, the corresponding frequency of the second receiving unit 104 is set to 800 MHz to 2.7 GHz, and the third receiving unit The corresponding frequency of 105 is set to 2.6 GHz to 5.4 GHz.

  Thereby, in the receiver 100 of this example, a plurality of modes of DTV (470 to 800 MHz), 3G (800 MHz, 2 GHz), WLAN and BT (2.4 GHz), 3GLTE (2.6 GHz), and WLAN (5 GHz) or Bands can be received simultaneously.

  Therefore, in the receiver 100 of this example, the first receiving unit 103 can watch the DTV and perform diversity communication or MIMO operation in the overlapping frequency band between the second receiving unit 104 and the third receiving unit 105. It becomes possible. Note that the overlapping band between the receiving units 103, 104, and 105 is preferably a frequency band of about one octave.

  Further, in the receiver 100 of this example, the frequency band supported by one of the receiving units 103, 104, and 105 can be narrowed, so that the current of a radio circuit such as LNA and MIX can be reduced, and the basics such as NF and distortion can be reduced. Performance can be optimized, and current consumption, circuit scale, and wireless characteristics can be improved.

(Embodiment 2)
FIG. 4 is a block diagram showing a configuration of a receiver of the wireless communication apparatus according to Embodiment 2 of the present invention.

  In a multiband radio device, for example, if an LPF corresponding to an entire radio system having a variable bandwidth of 10 kHz to 10 MHz is used as the variable bandwidth LPF, the circuit scale and current of the LPF increase.

  Therefore, in the receiver 120 of this example, as shown in FIG. 4, a plurality of band limiting variable filters 122 with different band variable widths are provided between the receiving units 103, 104, 105 and the signal processing unit 106. 123, 124 are provided, and the band limiting variable filters 122, 123, 124 are switched by the switch units 121, 125.

  In FIG. 4, each band limiting variable filter 122, 123, 124 is an LPF having a band variable width of 10 kHz to 1 MHz, for example, as the band limiting variable filter 122 according to the reception mode of each receiving unit 103, 104, 105. In addition, LPFs having a band variable width of 100 kHz to 10 MHz are used as the band limiting variable filters 123 and 124.

  The switch unit 121 switches the connection between the receiving units 103, 104, and 105 and the band limiting variable filters 122, 123, and 124.

  The switch unit 125 switches the connection between the band limiting variable filters 122, 123, and 124 and the signal processing unit (ADC) 106.

  Thereby, in the receiver 120 of this example, the variable width of each band limiting variable filter 122, 123, 124 can be reduced, and the circuit scale and current are reduced.

  Further, in the receiver 120 of this example, since the reception performance deterioration due to the interference wave can be suppressed by the band limitation by the band limiting variable filters 122, 123, and 124, the basic characteristics can be stabilized.

(Embodiment 3)
FIG. 5 is a block diagram showing a configuration of a receiver of the wireless communication apparatus according to Embodiment 3 of the present invention.

  As shown in FIG. 5, the receiver 130 of this example includes antennas 131, 132, and 133 dedicated to the respective receiving units corresponding to the receiving units 103, 104, and 105, respectively.

  In FIG. 5, the antenna 131 is configured to receive only radio waves in the same frequency band as the corresponding frequency band of the first receiving unit 103.

  The antenna 132 is configured to receive only radio waves in the same frequency band as the corresponding frequency band of the second receiving unit 104.

  The antenna 133 is configured to receive only radio waves in the same frequency band as the corresponding frequency band of the third receiving unit 105.

  Thus, since the receiver 130 of this example is configured to match the bands of the antennas 131, 132, and 133 with the bands of the receivers 103, 104, and 105, the number of antennas can be reduced. Further, it is possible to receive radio waves in an optimum band without using a high band antenna.

(Embodiment 4)
FIG. 6 is a block diagram showing a configuration of a receiver of the wireless communication apparatus according to Embodiment 4 of the present invention.

  As shown in FIG. 6, the receiver 140 of this example is provided with a plurality of RF filters 141a, 141b, 141c, 141d having different passbands between the antenna sharing unit 102 and the receiving units 103, 104, 105. The RF filter 141a, 141b, 141c, 141d is switched by the RF switch unit 142.

  In FIG. 6, the RF switch unit 142 selects which one of the RF filters 141a, 141b, 141c, and 141d is used according to the wireless system to be operated, and the antennas 101a, 101b, 101c, and 101d. The connection with each receiving unit 103, 104, 105 is switched.

  As a result, in the receiver 140 of this example, the RF switch unit 142 switches the connection between the antennas 101a, 101b, 101c, and 101d and the receivers 103, 104, and 105, whereby the receivers 103, 104, The received signal input to 105 can have a high signal quality (interference wave ratio) optimum for the receiving system.

  In addition, in the radio | wireless communication apparatus which concerns on each above-mentioned embodiment, although the structure of the receiver was demonstrated, this invention can be comprised similarly to a receiver also in a transmitter.

  As described above, the wireless communication apparatus according to the embodiment of the present invention receives (transmits) different frequency bands according to each wireless system by causing each receiving unit 103, 104, and 105 to have overlapping frequency bands. ) It is configured to be able to.

  In other words, the wireless communication apparatus according to the embodiment of the present invention can simultaneously transmit and receive a plurality of modes or bands, and have a plurality of frequency bands corresponding to a plurality of wireless systems that are different and can be received or transmitted in an overlapping manner. A radio circuit (reception / transmission) is provided.

  Therefore, in the wireless communication apparatus according to the embodiment of the present invention, the frequency that can be handled by one wireless unit can be narrowed, so that the current of the wireless circuit such as LNA and MIX can be reduced, and basic performance such as NF and distortion can be reduced. Can be optimized, current consumption, circuit scale, and wireless characteristics can be improved, and diversity communication and MIMO operation can be performed in overlapping frequency bands.

  The wireless communication device according to the present invention can be miniaturized because it shares a wireless circuit, and can simultaneously operate a plurality of different wireless systems and diversity, and can narrow a frequency band that can be handled by one wireless unit. Since the basic characteristics are good even with a small amount of current, it is useful as a wireless communication device such as a mobile phone that supports multimode and multiband.

  The present invention relates to a wireless communication apparatus such as a mobile phone that supports multimode / multiband.

  As shown in FIG. 7, this type of wireless communication device 10 includes a transmitter 11, a receiver 12, an antenna sharing unit 13, an antenna 14, and the like.

  In FIG. 7, the transmitter 11 converts an audio signal or a data signal that is transmission information into a transmission signal, and outputs the converted transmission signal to the antenna sharing unit 13.

  The antenna sharing unit 13 transmits the transmission signal input from the transmitter 11 through the antenna 14 as a transmission wave in a predetermined frequency band.

  On the other hand, the receiver 12 converts a reception signal of a predetermined frequency band received via the antenna 14 and the antenna sharing unit 13 into reception information such as an audio signal and a data signal and outputs the reception information.

  By the way, in this kind of wireless communication apparatus, cellular multi-band (Standard) such as 3GPP specifications, 3GPP-LTE specifications, GSM / EDGE is standard.

  Also, this type of wireless communication device needs to be multi-mode, such as compatible with international roaming.

  In addition, this type of wireless communication device (portable terminal) includes various terminals using various wireless resources such as wireless LAN (WLAN), Bluetooth (BT), digital television (DTV), GPS, and RF tag. Applications are starting to be installed.

  Also, in this type of wireless communication apparatus, a technique for improving wireless performance using a plurality of wireless circuits such as diversity and MIMO communication has become common.

  2. Description of the Related Art Conventionally, a wireless communication device having a configuration capable of receiving signals in different frequency bands with one system of diversity reception is known (see Patent Document 1).

In such a wireless communication apparatus compatible with, for example, the WCDMA compressed mode, it is not necessary to mount wireless units for different wireless systems and frequencies, so that the cost can be reduced and the size can be reduced.
JP 2005-229539 A

  However, the conventional wireless communication apparatus has one wireless unit when a response frequency band for simultaneously operating various terminal applications using wireless such as a multiband / multimode cellular system, a wireless LAN, and a digital television is increased. Broadband and wide tunable are required.

  For this reason, in the conventional wireless communication device, it is difficult to ensure stable communication performance due to an increase in current consumption and deterioration in communication performance due to NF / distortion.

  An object of the present invention is to provide a wireless communication apparatus that can simultaneously operate various terminal applications using wireless communication with a simple configuration.

  The wireless communication apparatus of the present invention includes a plurality of antennas and a second wireless system having a frequency band higher than that of the first wireless system and a signal transmitted / received via the plurality of antennas. A first wireless unit that shares wireless processing of the second wireless system and a third wireless that has a higher frequency band than the second wireless system and a signal that is transmitted and received via the plurality of antennas. A second wireless unit that shares wireless processing of the system.

  According to the present invention, since the radio circuit is shared, the size can be reduced. In addition, a plurality of different wireless systems and diversity can be operated simultaneously. Furthermore, since the frequency band that can be handled by one radio unit can be narrowed, the basic characteristics are improved even with a small current.

  Hereinafter, a wireless communication apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the component and equivalent part which have the same structure or function, and the description is not repeated.

  The present invention is characterized in that the corresponding frequency bands of a plurality of radio units overlap, but have different bands, and the overlapping frequency regions can be utilized for diversity communication and MIMO communication.

(Embodiment 1)
1 is a block diagram showing a configuration of a receiver of a wireless communication apparatus according to Embodiment 1 of the present invention. FIG. 2 is a diagram showing frequencies corresponding to each wireless system of the wireless communication apparatus according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the receiver 100 of this example includes antennas 101a, 101b, 101c, and 101d, an antenna sharing unit 102, a first receiving unit 103, a second receiving unit 104, a third receiving unit 105, and a signal processing unit. 106 and a control unit 107.

  In FIG. 1, antennas 101a, 101b, 101c, and 101d are connected to the antenna sharing unit 102 and receive transmission waves in frequency bands corresponding to the antennas.

The antenna sharing unit 102 includes a first receiving unit 103, a first receiving unit 103 corresponding to a wireless system that operates the reception signals of the respective bands received by the antennas 101a, 101b, 101c, and 101d based on the control signal of the control unit 107. 2 selectively output to the receiving unit 104 and the third receiving unit 105.

  Here, as shown in FIG. 2, the first receiving unit 103 has a frequency corresponding to the wireless system A and the wireless system B such as digital television broadcasting and cellular communication among the received signals input from the antenna sharing unit 102. A receiving circuit corresponding to f0 to f3 for receiving a reception signal in a band is provided.

  In addition, the second receiving unit 104 receives the received signals in the frequency bands corresponding to the wireless system B and the wireless system C such as cellular communication and Bluetooth among the received signals input from the antenna sharing unit 102, f2 to f5. A corresponding receiving circuit is provided.

  Further, the third reception unit 105 receives, from among the reception signals input from the antenna sharing unit 102, reception signals in a frequency band corresponding to the wireless system C and the wireless system D such as Bluetooth and wireless LAN, f4 to f7. A corresponding receiving circuit is provided.

  FIG. 3 shows a configuration example of the receiving circuits of the first receiving unit 103, the second receiving unit 104, and the third receiving unit 105.

  As shown in FIG. 3, the receiving circuit of each receiving unit 103, 104, 105 includes an RF filter 110, a low noise amplifier (LNA) 111, a local oscillator 112, a quadrature demodulator 113, low pass filters (LPF) 114a, 114b, AD converters (ADC) 115a and 115b are provided.

  In FIG. 3, the RF (band) filter 110 outputs the received signal input from the antenna sharing unit 102 to the low noise amplifier 111 only through the received signal in the frequency band corresponding to the preset wireless system.

  The low noise amplifier 111 amplifies the received signal in the frequency band corresponding to the preset wireless system input from the RF filter 110 and outputs the amplified signal to the quadrature demodulator 113.

  The quadrature demodulator 113 performs quadrature demodulation on the signal output from the low noise amplifier 111 based on a predetermined oscillation frequency signal given from the local oscillator 112 according to the reception frequency, and the quadrature demodulated I component signal and Q component signal Output to the low-pass filters 114a and 114b, respectively.

  The low-pass filters 114a and 114b control the bandwidth of the I component signal and the Q component signal input from the quadrature demodulator 113, and output the I component signal and the Q component signal of a desired bandwidth to the AD converters 115a and 115b, respectively. To do.

  The AD converters 115a and 115b perform A / D conversion on I component signals and Q component signals having desired bandwidths input from the low pass filters 114a and 114b, and convert the I component signals and Q component signals converted into digital signals into signal processing units. It outputs to 106 (refer FIG. 1).

  The signal processing unit 106 receives the I and Q component signals input from the AD converters 115a and 115b of the receiving circuits and the control signal input from the control unit 107, and receives the receiving units 103, 104, Processing for operating the wireless system corresponding to the reception frequency 105 is performed.

For example, as will be described later, the signal processing unit 106 views the DTV with the first receiving unit 103,
In the frequency band where the second receiving unit 104 and the third receiving unit 105 overlap, a process for performing diversity communication and a MIMO operation is performed.

  The control unit 107 controls the processing operations of the antenna sharing unit 102 and the signal processing unit 106 according to the wireless system operated by the receiver 100 of this example.

  As described above, the receiver 100 of this example is set such that the corresponding frequency bands of the first receiving unit 103, the second receiving unit 104, and the third receiving unit 105 overlap each other.

  As described above, the receiver 100 of the present example includes the plurality of receiving units 103, 104, and 105 having different corresponding frequency bands set so that some frequency bands overlap with each other. A plurality of wireless systems using a band can be received simultaneously.

  For example, in the receiver 100 of this example, the corresponding frequency of the first receiving unit 103 is set to 470 MHz to 2.2 GHz, the corresponding frequency of the second receiving unit 104 is set to 800 MHz to 2.7 GHz, and the third receiving unit The corresponding frequency of 105 is set to 2.6 GHz to 5.4 GHz.

  Thereby, in the receiver 100 of this example, a plurality of modes of DTV (470 to 800 MHz), 3G (800 MHz, 2 GHz), WLAN and BT (2.4 GHz), 3GLTE (2.6 GHz), and WLAN (5 GHz) or Bands can be received simultaneously.

  Therefore, in the receiver 100 of this example, the first receiving unit 103 can watch the DTV and perform diversity communication or MIMO operation in the overlapping frequency band between the second receiving unit 104 and the third receiving unit 105. It becomes possible. Note that the overlapping band between the receiving units 103, 104, and 105 is preferably a frequency band of about one octave.

  Further, in the receiver 100 of this example, the frequency band supported by one of the receiving units 103, 104, and 105 can be narrowed, so that the current of a radio circuit such as LNA and MIX can be reduced, and the basics such as NF and distortion can be reduced. Performance can be optimized, and current consumption, circuit scale, and wireless characteristics can be improved.

(Embodiment 2)
FIG. 4 is a block diagram showing a configuration of a receiver of the wireless communication apparatus according to Embodiment 2 of the present invention.

  In a multiband radio device, for example, if an LPF corresponding to an entire radio system having a variable bandwidth of 10 kHz to 10 MHz is used as the variable bandwidth LPF, the circuit scale and current of the LPF increase.

  Therefore, in the receiver 120 of this example, as shown in FIG. 4, a plurality of band limiting variable filters 122 with different band variable widths are provided between the receiving units 103, 104, 105 and the signal processing unit 106. 123, 124 are provided, and the band limiting variable filters 122, 123, 124 are switched by the switch units 121, 125.

  In FIG. 4, each band limiting variable filter 122, 123, 124 is an LPF having a band variable width of 10 kHz to 1 MHz, for example, as the band limiting variable filter 122 according to the reception mode of each receiving unit 103, 104, 105. In addition, LPFs having a band variable width of 100 kHz to 10 MHz are used as the band limiting variable filters 123 and 124.

  The switch unit 121 switches the connection between the receiving units 103, 104, and 105 and the band limiting variable filters 122, 123, and 124.

  The switch unit 125 switches the connection between the band limiting variable filters 122, 123, and 124 and the signal processing unit (ADC) 106.

  Thereby, in the receiver 120 of this example, the variable width of each band limiting variable filter 122, 123, 124 can be reduced, and the circuit scale and current are reduced.

  Further, in the receiver 120 of this example, since the reception performance deterioration due to the interference wave can be suppressed by the band limitation by the band limiting variable filters 122, 123, and 124, the basic characteristics can be stabilized.

(Embodiment 3)
FIG. 5 is a block diagram showing a configuration of a receiver of the wireless communication apparatus according to Embodiment 3 of the present invention.

  As shown in FIG. 5, the receiver 130 of this example includes antennas 131, 132, and 133 dedicated to the respective receiving units corresponding to the receiving units 103, 104, and 105, respectively.

  In FIG. 5, the antenna 131 is configured to receive only radio waves in the same frequency band as the corresponding frequency band of the first receiving unit 103.

  The antenna 132 is configured to receive only radio waves in the same frequency band as the corresponding frequency band of the second receiving unit 104.

  The antenna 133 is configured to receive only radio waves in the same frequency band as the corresponding frequency band of the third receiving unit 105.

  Thus, since the receiver 130 of this example is configured to match the bands of the antennas 131, 132, and 133 with the bands of the receivers 103, 104, and 105, the number of antennas can be reduced. Further, it is possible to receive radio waves in an optimum band without using a high band antenna.

(Embodiment 4)
FIG. 6 is a block diagram showing a configuration of a receiver of the wireless communication apparatus according to Embodiment 4 of the present invention.

  As shown in FIG. 6, the receiver 140 of this example is provided with a plurality of RF filters 141a, 141b, 141c, 141d having different passbands between the antenna sharing unit 102 and the receiving units 103, 104, 105. The RF filter 141a, 141b, 141c, 141d is switched by the RF switch unit 142.

  In FIG. 6, the RF switch unit 142 selects which one of the RF filters 141a, 141b, 141c, and 141d is used according to the wireless system to be operated, and the antennas 101a, 101b, 101c, and 101d. The connection with each receiving unit 103, 104, 105 is switched.

Thus, in the receiver 140 of this example, each antenna 10 is connected by the RF switch unit 142.
By switching the connection between 1a, 101b, 101c, and 101d and each receiving unit 103, 104, and 105, the received signal input to each receiving unit 103, 104, and 105 is converted into an optimum signal quality (interference wave ratio) for the receiving system. ) Can be high.

  In addition, in the radio | wireless communication apparatus which concerns on each above-mentioned embodiment, although the structure of the receiver was demonstrated, this invention can be comprised similarly to a receiver also in a transmitter.

  As described above, the wireless communication apparatus according to the embodiment of the present invention receives (transmits) different frequency bands according to each wireless system by causing each receiving unit 103, 104, and 105 to have overlapping frequency bands. ) It is configured to be able to.

  In other words, the wireless communication apparatus according to the embodiment of the present invention can simultaneously transmit and receive a plurality of modes or bands, and have a plurality of frequency bands corresponding to a plurality of wireless systems that are different and can be received or transmitted in an overlapping manner. A radio circuit (reception / transmission) is provided.

  Therefore, in the wireless communication apparatus according to the embodiment of the present invention, the frequency that can be handled by one wireless unit can be narrowed, so that the current of the wireless circuit such as LNA and MIX can be reduced, and basic performance such as NF and distortion can be reduced. Can be optimized, current consumption, circuit scale, and wireless characteristics can be improved, and diversity communication and MIMO operation can be performed in overlapping frequency bands.

  The wireless communication device according to the present invention can be miniaturized because it shares a wireless circuit, and can simultaneously operate a plurality of different wireless systems and diversity, and can narrow a frequency band that can be handled by one wireless unit. Since the basic characteristics are good even with a small amount of current, it is useful as a wireless communication device such as a mobile phone that supports multimode and multiband.

1 is a block diagram showing a configuration of a receiver of a wireless communication apparatus according to Embodiment 1 of the present invention. The figure which shows the frequency corresponding to each radio | wireless system of the radio | wireless communication apparatus which concerns on Embodiment 1 of this invention. The block diagram which shows the structural example of the receiving part of the receiver of the radio | wireless communication apparatus which concerns on Embodiment 1 of this invention. FIG. 3 is a block diagram showing a configuration of a receiver of a wireless communication apparatus according to Embodiment 2 of the present invention. FIG. 4 is a block diagram showing a configuration of a receiver of a wireless communication apparatus according to Embodiment 3 of the present invention. FIG. 7 is a block diagram showing a configuration of a receiver of a wireless communication apparatus according to Embodiment 4 of the present invention. The block diagram which shows schematic structure of a radio | wireless communication apparatus

Claims (4)

Multiple antennas,
A first wireless unit that shares wireless processing between a first wireless system and a second wireless system having a frequency band higher than that of the first wireless system for signals transmitted and received via the plurality of antennas;
A second radio unit that shares radio processing of the second radio system and a third radio system having a frequency band higher than that of the second radio system for signals transmitted and received via the plurality of antennas; ,
A wireless communication apparatus comprising: A plurality of band limiting variable filters having different band variable widths for limiting the frequency bands output by the first and second radio units;
Switching means for switching connection between the first and second radio units and the plurality of band limiting variable filters;
The wireless communication apparatus according to claim 1, further comprising: The wireless communication apparatus according to claim 1, wherein the plurality of antennas receive radio waves in frequency bands respectively corresponding to the first and second radio units. A plurality of RF filters for limiting frequency bands input to the first and second radio units;
Switching means for switching connection between the first and second radio units and the plurality of RF filters;
The wireless communication apparatus according to claim 1, further comprising:

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