WO2012029932A1 - Transmission device, transmission method, terminal device, and mounting method - Google Patents

Transmission device, transmission method, terminal device, and mounting method Download PDF

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Publication number
WO2012029932A1
WO2012029932A1 PCT/JP2011/069966 JP2011069966W WO2012029932A1 WO 2012029932 A1 WO2012029932 A1 WO 2012029932A1 JP 2011069966 W JP2011069966 W JP 2011069966W WO 2012029932 A1 WO2012029932 A1 WO 2012029932A1
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signal
frequency
occupied bandwidth
transmission
processing
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PCT/JP2011/069966
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French (fr)
Japanese (ja)
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丸橋　建一
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日本電気株式会社
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Priority to JP2012531971A priority Critical patent/JPWO2012029932A1/en
Publication of WO2012029932A1 publication Critical patent/WO2012029932A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0475—Circuits with means for limiting noise, interference or distortion

Definitions

  • the present invention relates to a transmission device, a transmission method, a terminal device, and a mounting method.
  • millimeter wave band wireless communication As a high-speed wireless communication technology, millimeter wave band wireless communication is known. For example, as described in Non-Patent Document 1, millimeter wave wireless communication achieves a transmission rate of several Gbit / s by using a channel with a width of 2 GHz.
  • the millimeter wave band RF (Radio Frequency) signal is assigned to a frequency band of 57 GHz to 66 GHz, for example.
  • an RF (Radio Frequency) signal is generated using a quadrature modulator, the occupied bandwidth of the baseband signal is about 1 GHz per channel.
  • the occupied bandwidth of the IF signal is substantially the same as the occupied bandwidth of the RF signal, and is about 2 GHz per channel.
  • feeder power feeding
  • measures are taken such as supplying power with a wiring as short as possible (Non-Patent Document 2) or mounting an IC on which a wireless circuit is integrated on the back surface of the antenna substrate (Non-Patent Document 3).
  • the millimeter-wave wireless device is mounted on, for example, a notebook computer including a main body including a keyboard and a display including a display.
  • FIG. 11 shows an example of mounting a superheterodyne wireless device on a notebook computer.
  • the wireless device includes at least a baseband circuit, an RF front end, and an antenna.
  • the baseband circuit is mounted on the main body, while the RF front end and antenna having a function of converting to millimeter waves are mounted on the display.
  • FIG. 9 is a graph showing an example of loss characteristics of a fine coaxial cable with a connector. As can be seen from FIG. 9, the loss of the coaxial cable gradually increases as the frequency increases and rapidly increases when the frequency exceeds a predetermined frequency.
  • FIG. 10 is a graph showing the relationship between coaxial cable loss and signal frequency arrangement.
  • the loss characteristic of the coaxial cable in FIG. 10 is assumed to be equal to the loss characteristic shown in FIG. Basically, the in-band deviation ⁇ f1 of a signal with a wide occupied bandwidth is larger than the in-band deviation of a signal with a narrow occupied bandwidth.
  • a signal with a wide occupied bandwidth is, for example, a millimeter wave IF signal having a maximum occupied bandwidth of 2 GHz and transmitted in the 9-14 GHz band.
  • a signal having a narrow occupied bandwidth is, for example, a microwave RF signal having an occupied bandwidth of 20 MHz or 40 MHz and transmitted in a 2.4 GHz or 5 GHz band.
  • An object of the present invention is to provide a transmission device, a transmission method, a terminal device, and a mounting method for solving the problem of reducing in-band deviation, which is more problematic in broadband transmission.
  • the transmission apparatus of the present invention includes first processing means for performing baseband processing of a first signal having a first occupied bandwidth, second processing means for performing RF (Radio Frequency) processing of the first signal, and first processing. And a cable connecting the second processing means and the first signal and a second signal having a second occupied bandwidth that is narrower than the first occupied bandwidth, for transmission in the cable, The transmission frequency of the first signal is lower than the transmission frequency of the second signal.
  • the transmission method of the present invention includes a first processing unit that performs baseband processing of a first signal having a first occupied bandwidth and a second processing unit that performs RF processing of the first signal, which are connected via a cable.
  • the transmission frequency of the first signal is: The frequency is lower than the transmission frequency of the second signal.
  • the terminal device of the present invention is mounted with a main body portion on which a first processing circuit that performs baseband processing of a first signal having a first occupied bandwidth is mounted, and a second processing circuit that performs RF processing on the first signal. And a cable for connecting the first processing circuit and the second processing circuit, and the first signal and the second signal having a second occupied bandwidth narrower than the first occupied bandwidth in the cable.
  • the transmission frequency of the first signal is set to be lower than the transmission frequency of the second signal.
  • a wireless circuit including a first processing circuit that performs baseband processing of a first signal having a first occupied bandwidth and a second processing circuit that performs RF processing of the first signal is provided as a terminal device.
  • the first processing circuit is mounted on the main body of the terminal device, the second processing circuit is mounted on the display unit of the terminal device, and the first processing circuit and the second processing circuit are mounted.
  • the transmission frequency of the first signal is set to the second signal. The frequency is lower than the transmission frequency.
  • FIG. 1 is a block diagram illustrating a configuration example of a transmission apparatus 20 according to the first embodiment of the present invention.
  • the transmission device 20 includes a first processing unit 22 and a second processing unit 24.
  • the first processing unit 22 and the second processing unit 24 are connected by a cable 26.
  • the first processing unit 22 is mounted on the main body unit 32 of the terminal device 30, and the second processing unit 24 is mounted on the display unit 34.
  • the first processing unit 22 executes at least baseband processing of the first signal having the first occupied bandwidth.
  • the second processing unit 24 executes at least RF (Radio Frequency) processing of the first signal.
  • RF Radio Frequency
  • the first signal may be a signal used for, for example, millimeter-wave wireless communication
  • the second signal may be a wireless LAN (Local Area Network) signal, for example.
  • the cable 26 can be a coaxial cable, for example.
  • the transmission frequency of the first signal is set to the second signal.
  • the frequency is lower than the transmission frequency.
  • the cable 26 is, for example, a fine coaxial cable (for example, a coaxial cable having a low-profile connector), as described with reference to FIG. 9, the increase rate of the loss of the fine coaxial cable is When the frequency exceeds a predetermined frequency, it rapidly increases.
  • FIG. 2 is a block diagram illustrating a configuration example of a radio apparatus (transmission apparatus) according to the second embodiment of the present invention.
  • the main body 1 includes a baseband circuit 4a that handles a signal with a small occupied bandwidth (for example, a wireless LAN signal), a modulator / demodulator 5a, and an RF front end 6a.
  • the main unit 1 further includes a baseband circuit 4b that handles a signal with a wide occupied bandwidth (a signal used for millimeter-wave wireless communication), a modem 5b, and a duplexer 7.
  • the display unit 2 includes a duplexer 8, an RF front end 6b for millimeter waves, an antenna 9a (first antenna), and an antenna 9b (second antenna).
  • the duplexer 7 of the main unit 1 and the duplexer 8 of the display unit 2 are connected via a coaxial cable 10 (cable).
  • the duplexer 7 of the main body 1 superimposes the RF output signal from the RF front end 6a and the IF output signal from the modem 5b on one signal. Then, the duplexer 7 transmits the superimposed signal to the duplexer 8 of the display unit 2 through the coaxial cable 10.
  • the duplexer 8 separates the RF output signal and the IF output signal from the superimposed signal.
  • the RF output signal is transmitted from the antenna 9a.
  • the IF output signal is up-converted to an RF output signal by the millimeter wave RF front end 6b and transmitted from the antenna 9b.
  • the RF output signal from the RF front end 6a is, for example, the 2.4 GHz band or the 5 GHz band.
  • the IF output signal output from the modem 5b is a signal lower than 2.4 GHz, for example, up to 2 GHz.
  • the IF output signal with a wide occupied bandwidth (for example, 2 GHz / 1 channel) has a low frequency
  • the 2.4 GHz band and the 5 GHz band with a small occupied bandwidth have a high frequency (for example, 20 MHz or 40 MHz).
  • the signal is transmitted through the coaxial cable 10.
  • FIG. 7 is a graph showing the relationship between the coaxial cable loss and the signal frequency arrangement in the second embodiment.
  • the loss characteristics of the coaxial cables of FIGS. 7 and 10 are equal.
  • the in-band deviation ⁇ f2 shown in FIG. 7 is significantly smaller than the in-band deviation ⁇ f1 shown in FIG. The reason will be described.
  • the increase rate of the loss of a fine coaxial cable increases rapidly when a predetermined frequency is exceeded. Accordingly, a signal having a wide occupied bandwidth is transmitted at a frequency lower than the in-band deviation ⁇ f1 (see FIG.
  • a signal with a wide occupied bandwidth and “a signal with a narrow occupied bandwidth” mean that the occupied bandwidth of one signal is the other. It means that it is "relatively” wider (or narrower) than the occupied bandwidth of the signal.
  • the occupied bandwidth of the signal satisfies this condition, and the specific occupied bandwidth of each signal is not limited to the above.
  • the frequency of the signal satisfies this condition, and the specific frequency of each signal is not limited to the above.
  • a case where a signal with a large occupied bandwidth is transmitted at a frequency lower than a frequency at which a signal with a small occupied bandwidth is transmitted is described as an example, but the present invention is not limited to this.
  • FIG. 3 is a block diagram illustrating a configuration example of a radio apparatus (transmission apparatus) according to the third embodiment of the present invention.
  • a terminal device for example, a notebook personal computer
  • FIG. 3 shows a case where this wireless device is applied to a terminal device (for example, a notebook personal computer) composed of, for example, a main body 1 and a display 2.
  • the main body 1 includes a baseband circuit 4c and a modem 5c.
  • the display unit 2 includes a duplexer 8, an RF front end 6a, an RF front end 6b for millimeter waves, an antenna 9a, and an antenna 9b.
  • the modem 5 c of the main body 1 and the duplexer 8 of the display unit 2 are connected via a coaxial cable 10.
  • the baseband circuit 4c outputs a baseband signal of a signal with a narrow occupied bandwidth and a signal with a wide occupied bandwidth to the modem 5c.
  • a signal with a small occupied bandwidth is, for example, a wireless LAN signal
  • a signal with a large occupied bandwidth is, for example, a signal used for millimeter-wave wireless communication.
  • the baseband circuit 4c when the interface between the baseband circuit 4c and the modem 5c is one, the baseband circuit 4c outputs both baseband signals in a time division manner.
  • the modem 5c outputs an IF output signal including an IF signal having a narrow occupied bandwidth and an IF signal having a wide occupied bandwidth.
  • the frequency of the IF signal of the signal having a narrow occupied bandwidth is set higher than the frequency of the IF signal of the signal having a wide occupied bandwidth.
  • the IF output signal is transmitted to the duplexer 8 mounted on the display unit 2 via the coaxial cable 10.
  • the IF output signal is separated by the duplexer 8 according to the frequency.
  • the IF output signal having a narrow occupied bandwidth is up-converted to an RF signal by the RF front end 6a and transmitted by the antenna 9a.
  • the IF output signal having a wide occupied bandwidth is up-converted to an RF signal by the millimeter wave RF front end 6b and transmitted by the antenna 9b.
  • the reason why the in-band deviation can be reduced is the same as in the second embodiment, and thus the description thereof is omitted here.
  • the configuration can be simplified.
  • the modem 5c has a function of changing the frequency from the baseband signal to the IF signal as described above with respect to a signal having a small occupied bandwidth.
  • the modem 5c may generate the RF signal directly from the baseband signal without generating the IF signal. That is, the direct conversion method can be supported.
  • FIG. 4 is a block diagram illustrating a configuration example of a radio apparatus (transmission apparatus) according to the fourth embodiment of the present invention.
  • FIG. 4 is a block diagram illustrating a configuration example of a radio apparatus (transmission apparatus) according to the fourth embodiment of the present invention.
  • the main unit 1 is used for a baseband circuit 4a that handles a signal with a small occupied bandwidth (for example, a wireless LAN signal), a modem 5a, an RF front end 6a, and a signal with a large occupied bandwidth (for example, millimeter-wave radio).
  • a baseband circuit 4b for handling signals and a duplexer 7.
  • the display unit 2 includes a duplexer 8, a modem 5b, a millimeter wave RF front end 6b, an antenna 9a, and an antenna 9b.
  • the duplexer 7 of the main body 1 and the duplexer 8 of the display unit 2 are connected via a coaxial cable 10.
  • the duplexer 7 of the main body 1 superimposes the RF output signal from the RF front end 6a and the baseband output signal from the baseband circuit 4b.
  • the duplexer 7 transmits the superimposed signal to the duplexer 8 of the display unit 2 through the coaxial cable 10.
  • the RF output signal separated by the duplexer 8 is transmitted by the antenna 9a.
  • the baseband output signal separated by the duplexer 8 is up-converted by the millimeter wave RF front end 6b via the modulator / demodulator 5b and transmitted by the antenna 9b.
  • the RF output signal from the RF front end 6a is, for example, the 2.4 GHz band or the 5 GHz band.
  • the baseband output signal output from the baseband circuit 4b is a signal lower than 2.4 GHz, for example, up to 2 GHz.
  • baseband output signals with a large occupied bandwidth eg 2 GHz
  • 2.4 GHz and 5 GHz band RF output signals with a narrow occupied bandwidth eg 20 MHz or 40 MHz
  • the RF frequency of the wireless LAN is the upper limit for the frequency that passes through the coaxial cable, there is no need to select a special coaxial cable even if it is shared with the baseband signal of millimeter wave radio. It can also contribute to cost reduction. Therefore, according to the fourth embodiment, as in the second and third embodiments, it is possible to reduce the in-band deviation which is more problematic in wideband transmission. In the fourth embodiment, the reason why the in-band deviation can be reduced is the same as that in the second embodiment, and thus the description thereof is omitted here. Furthermore, according to the fourth embodiment, not only the IF signal but also the baseband signal can be sent by the coaxial cable, so that the selection range can be further expanded.
  • FIG. 5 is a block diagram illustrating a configuration example of a radio apparatus (transmission apparatus) according to the fifth embodiment of the present invention.
  • FIG. 5 shows a case where this wireless device is applied to a terminal device (for example, a notebook computer) composed of, for example, the main body 1 and the display 2.
  • the main body 1 includes a baseband circuit 4a that handles a signal with a small occupied bandwidth (for example, a wireless LAN signal), a modulator / demodulator 5a, and an RF front end 6a.
  • the main body 1 further includes a baseband circuit 4b that handles a signal with a wide occupied bandwidth (for example, a signal used for millimeter wave radio), a duplexer 7-1, and a duplexer 7-2.
  • the display unit 2 includes a duplexer 8-1, a duplexer 8-2, a modem 5b, a millimeter wave RF front end 6b, antennas 9a-1, 9a-2, and an antenna 9b. .
  • the duplexer 7-1 of the main body 1 and the duplexer 8-1 of the display unit 2 are connected via a coaxial cable 10-1.
  • the duplexer 7-2 of the main body 1 and the duplexer 8-2 of the display unit 2 are connected via a coaxial cable 10-2.
  • the wireless LAN corresponds to MIMO (Multiple Input Multiple Output). Therefore, the RF output signal from the RF front end 6a is divided into channel 1 (Ch1) and channel 2 (Ch2).
  • the baseband signal from the baseband circuit 4b is divided into orthogonal signals Ich and Qch. Ch1 and Ich are superimposed by the duplexer 7-1. This superimposed signal is transmitted to the duplexer 8-1 of the display unit 2 through the coaxial cable 10-1.
  • Ch2 and Qch are superimposed by the duplexer 7-2.
  • This superimposed signal is transmitted to the duplexer 8-2 of the display unit 2 through the coaxial cable 10-2.
  • the RF signals (Ch1, Ch2) separated by the duplexers 8-1, 8-2 are transmitted to the antennas 9a-1, 9a-2, respectively.
  • the baseband signals (Ich, Qch) are respectively modulated by the modem 5b, up-converted by the RF front end 6b, and transmitted by the antenna 9b.
  • the RF output signal from the RF front end 6a is, for example, the 2.4 GHz band or the 5 GHz band.
  • the baseband output signal output from the baseband circuit 4b is a signal lower than 2.4 GHz, for example, up to 1 GHz.
  • the occupied bandwidth of the signal used for millimeter-wave radio is about half of the occupied bandwidth of the second to fourth embodiments.
  • FIG. 8 is a graph showing the relationship between the coaxial cable loss and the signal frequency arrangement in the fifth embodiment.
  • FIG. 8 and FIG. 7 are compared. In this case, it is assumed that the loss characteristics of the coaxial cables of FIGS. 8 and 7 are equal.
  • the orthogonal signal has approximately half the occupied bandwidth (for example, 2 GHz ⁇ 1 GHz) compared to the RF signal and IF signal. Therefore, the in-band deviation ⁇ f3 shown in FIG. 8 is also smaller than the in-band deviation ⁇ f2 shown in FIG.
  • the in-band deviation can be further reduced.
  • the operation at the time of transmission is taken as an example, but at the time of reception, the signal is transmitted in the reverse direction.
  • the number of RF signals (number of channels) output from the RF front end 6a (or input to the RF front end 6a) is not fixed but varies depending on the MIMO specification.
  • the number of baseband signals output from the baseband circuit 4b (or input to the baseband circuit 4b) is not fixed, but varies depending on specifications such as when differential wiring is used or when transmission / reception wiring is used. Therefore, the number of the coaxial cables 10 and whether a part or all of the coaxial cables are shared are design matters and can be arbitrarily changed.
  • FIG. 6 is a block diagram illustrating a configuration example of a radio apparatus (transmission apparatus) according to the sixth embodiment of the present invention.
  • FIG. 6 shows a case where this wireless apparatus is applied to, for example, an information terminal (for example, a notebook computer) composed of a main body 1 and a display 2.
  • the sixth embodiment is different from the fifth embodiment (see FIG. 5) in the configuration of the display unit 2.
  • the quadrature signals Ich and Qch output from the duplexers 8-1 and 8-2 are divided into two systems of modulators / demodulators 5b-1 and 5b-2, and the RF front end. Modulated and up-converted by 6b-1 and 6b-2, and output by antennas 9b-1 and 9b-2.
  • the configuration of the main body 1 is the same as that of the fifth embodiment. According to the sixth embodiment, as in the second to fifth embodiments described above, since a signal having a wide occupied bandwidth is transmitted at a low frequency, the in-band deviation more problematic in wideband transmission. Can be reduced.
  • the in-band deviation can be further reduced.
  • the set of the RF front end 6b-1 and the antenna 9b-1 and the set of the RF front end 6b-2 and the antenna 9b-2 are separated in the display unit 2. Can be installed. Accordingly, it is possible to obtain shielding and diversity effect in the communication path. Furthermore, in such a configuration, it is not necessary to draw a signal at a high frequency such as millimeter waves.
  • the operation at the time of transmission is taken as an example, but at the time of reception, the signal is transmitted in the reverse direction.
  • the number of RF signals (number of channels) output from the RF front end 6a (or input to the RF front end 6a) is not fixed but varies depending on the MIMO specification.
  • the number of baseband signals output from the baseband circuit 4b (or input to the baseband circuit 4b) is not fixed, but varies depending on specifications such as when differential wiring is used or when transmission / reception wiring is used. That is, the number of the coaxial cables 10 and whether a part or all of the coaxial cables are shared are design matters and can be arbitrarily changed.
  • the wireless devices according to the second to sixth embodiments described above are not limited to notebook computers, but can be applied to other devices (for example, cellular phones and PDAs (Personal Digital Assistants)). Not too long.
  • the present invention has been described with reference to the embodiments, the present invention is not limited to the above-described embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention. This application claims the priority on the basis of Japanese application Japanese Patent Application No. 2010-195369 for which it applied on September 1, 2010, and takes in those the indications of all here.

Abstract

In order to reduce in-band deviation that is more of a problem in wide-band transmission, this transmission device is provided with: a first processing means that performs baseband processing of a first signal having a first occupied bandwidth; a second processing means that performs radio frequency (RF) processing of the first signal; and a cable that connects the first processing means and the second processing means. When a first signal and a second signal having a second occupied bandwidth that is narrower than the first occupied bandwidth are transmitted in a commonly used cable, the transmission frequency of the first signal is caused to be a lower frequency than the transmission frequency of the second signal.

Description

伝送装置、伝送方法、端末装置、および実装方法Transmission device, transmission method, terminal device, and mounting method
　本発明は、伝送装置、伝送方法、端末装置、および実装方法に関する。 The present invention relates to a transmission device, a transmission method, a terminal device, and a mounting method.
　高速無線通信技術として、ミリ波帯無線通信が知られている。ミリ波帯無線通信は、例えば、非特許文献１に記載されているように、２ＧＨｚ幅のチャネルを使用することにより、数Ｇｂｉｔ／ｓの伝送レートを実現している。
　ミリ波帯のＲＦ（Ｒａｄｉｏ　Ｆｒｅｑｕｅｎｃｙ）信号は、例えば、５７ＧＨｚ~６６ＧＨｚの周波数帯に割り当てられている。なお、直交変調器を用いてＲＦ（Ｒａｄｉｏ　Ｆｒｅｑｕｅｎｃｙ）信号を生成する場合のベースバンド信号の占有帯域幅は、１チャネルあたり約１ＧＨｚである。直交変調器でＩＦ（Ｉｎｔｅｒｍｅｄｉａｔｅ　Ｆｒｅｑｕｅｎｃｙ）信号を生成しＲＦ信号に変換する場合のＩＦ信号の占有帯域幅は、ＲＦ信号の占有帯域幅と概ね同じで、１チャネルあたり２ＧＨｚ程度となる。
　このような高い周波数の信号を、長い距離の配線で引き回すと、フィーダー（給電）損失が大きくなってしまう。従って、なるべく短い距離の配線で給電するか（非特許文献２）、あるいは、無線回路が集積されたＩＣをアンテナ基板の裏面に実装する（非特許文献３）などの対策が施される。
　ここで、ミリ波無線装置を、例えば、キーボードを含む本体部とディスプレイを含む表示部とで構成されるノートパソコンに実装する場合について考察する。本体部側にアンテナを配置すると、キーボードを操作するユーザの手がアンテナ付近に位置するようになるため、通信が遮蔽される可能性が高くなる。従って、アンテナはキーボードから離間した表示部側に配置されるのが望ましい。この場合、表示部の実装エリアが限られていること、また、デジタル部については電源部やデータバスからの距離が長くならないようにすることを考慮する必要がある。図１１は、スーパーヘテロダイン方式の無線装置のノートパソコンへの実装例である。無線装置は、ベースバンド回路、ＲＦフロントエンド、およびアンテナを少なくとも含んでいる。ベースバンド回路は本体部に実装され、一方、ミリ波への周波数変換機能をもったＲＦフロントエンドおよびアンテナは表示部に実装される。すなわち、この場合、アンテナへの給電は、ミリ波より低い周波数で行われる。例えば、非特許文献４の無線チップではＩＦ周波数帯として９−１４ＧＨｚが採用されている。このため、ベースバンド回路の出力を比較的長い距離の配線で引き回しても、フィーダー損失は大きくない。 As a high-speed wireless communication technology, millimeter wave band wireless communication is known. For example, as described in Non-Patent Document 1, millimeter wave wireless communication achieves a transmission rate of several Gbit / s by using a channel with a width of 2 GHz.
The millimeter wave band RF (Radio Frequency) signal is assigned to a frequency band of 57 GHz to 66 GHz, for example. In addition, when an RF (Radio Frequency) signal is generated using a quadrature modulator, the occupied bandwidth of the baseband signal is about 1 GHz per channel. When an IF (Intermediate Frequency) signal is generated by a quadrature modulator and converted into an RF signal, the occupied bandwidth of the IF signal is substantially the same as the occupied bandwidth of the RF signal, and is about 2 GHz per channel.
When such a high-frequency signal is routed over a long distance wiring, feeder (power feeding) loss increases. Therefore, measures are taken such as supplying power with a wiring as short as possible (Non-Patent Document 2) or mounting an IC on which a wireless circuit is integrated on the back surface of the antenna substrate (Non-Patent Document 3).
Here, consider a case where the millimeter-wave wireless device is mounted on, for example, a notebook computer including a main body including a keyboard and a display including a display. When the antenna is disposed on the main body side, the user's hand operating the keyboard is positioned near the antenna, and thus there is a high possibility that communication is blocked. Therefore, it is desirable to arrange the antenna on the display unit side that is separated from the keyboard. In this case, it is necessary to consider that the mounting area of the display unit is limited and that the distance from the power supply unit and the data bus is not increased for the digital unit. FIG. 11 shows an example of mounting a superheterodyne wireless device on a notebook computer. The wireless device includes at least a baseband circuit, an RF front end, and an antenna. The baseband circuit is mounted on the main body, while the RF front end and antenna having a function of converting to millimeter waves are mounted on the display. That is, in this case, power is supplied to the antenna at a frequency lower than that of the millimeter wave. For example, in the wireless chip of Non-Patent Document 4, 9-14 GHz is adopted as the IF frequency band. For this reason, even if the output of the baseband circuit is routed by a relatively long distance wiring, the feeder loss is not large.
　ところで、ノートパソコンにはマイクロ波を用いる無線ＬＡＮ（Ｌｏｃａｌ　Ａｒｅａ　Ｎｅｔｗｏｒｋ）が既に実装されている場合が多い。また、複数のアンテナを持ったＭＩＭＯ（Ｍｕｌｔｉｐｌｅ　Ｉｎｐｕｔ　Ｍｕｌｔｉｐｌｅ　Ｏｕｔｐｕｔ）対応のノートパソコンが知られている。しかし、このようなノートパソコンにおいても無線ＬＡＮモジュールは本体部に実装され、全部若しくは複数のアンテナが表示部に実装される。すなわち、多くのアンテナへの給電が必要となる。しかし、本体部と表示部とを接続するヒンジ部の空間は限られているため、給電のための同軸ケーブルは必然的に径が細く、低背コネクタを使用した微細なものとなる。
　一方、当然のことながらミリ波無線装置に給電を行なう必要がある。しかし、上述したとおりヒンジ部の空間は限られているため、新規の給電線（同軸ケーブル）を設けることは困難である。そこで、ミリ波無線装置への給電に関し、既存の同軸ケーブル（例えば、無線ＬＡＮ用の２．４ＧＨｚ帯および５ＧＨｚ帯を通過させる同軸ケーブル）をミリ波無線装置と共用することが望ましい。
　しかしながら、ミリ波無線装置への給電に共用される同軸ケーブルは、上述したとおり微細なものである。図９は、コネクタ付きの微細な同軸ケーブルの損失特性例を示すグラフである。図９から諒解されるように、同軸ケーブルの損失は、周波数が高くなるにつれて徐々に大きくなり、所定の周波数を越えると急激に増加する。
　図１０は、同軸ケーブル損失と信号の周波数配置の関係を示すグラフである。なお、図１０における同軸ケーブルの損失特性は、図９に示す損失特性と等しいものとする。基本的には、占有帯域幅が広い信号の帯域内偏差Δｆ１は、占有帯域幅が狭い信号の帯域内偏差よりも大きくなる。占有帯域幅が広い信号とは、例えば占有帯域幅が最大２ＧＨｚであり、９−１４ＧＨｚ帯で伝送されるミリ波ＩＦ信号である。占有帯域幅が狭い信号とは、例えば占有帯域幅が２０ＭＨｚまたは４０ＭＨｚであり、２．４ＧＨｚまたは５ＧＨｚ帯で伝送されるマイクロ波ＲＦ信号である。さらに、占有帯域幅が広い信号を伝送する周波数が同軸ケーブルの損失の増加率が急激に増加する周波数以上である場合、帯域内偏差Δｆ１はより一層大きなものとなってしまう。ＯＦＤＭ（Ｏｒｔｈｏｇｏｎａｌ　Ｆｒｅｑｕｅｎｃｙ　Ｄｉｖｉｓｉｏｎ　Ｍｕｌｔｉｐｌｅｘｉｎｇ）変調の場合、搬送波が複数のサブキャリアに分割されているので、帯域内偏差が多少大きくても許容される。しかしながら、広帯域通信で必要とされる高速のＡＤＣ（Ａｎａｌｏｇ　ｔｏ　Ｄｉｇｉｔａｌ　Ｃｏｎｖｅｒｔｅｒ：アナログ−デジタル変換器）ではビット分解能が小さく、ダイナミックレンジがとれないため、帯域内偏差を小さく留めなければならない。
　本発明は、広帯域伝送においてより問題となる帯域内偏差を軽減させるという課題を解決するための伝送装置、伝送方法、端末装置、および実装方法を提供することを目的とする。 By the way, there are many cases where a wireless LAN (Local Area Network) using a microwave is already mounted on a notebook personal computer. In addition, a notebook computer compatible with MIMO (Multiple Input Multiple Output) having a plurality of antennas is known. However, even in such a notebook personal computer, the wireless LAN module is mounted on the main body, and all or a plurality of antennas are mounted on the display. That is, power supply to many antennas is required. However, since the space of the hinge part that connects the main body part and the display part is limited, the coaxial cable for power feeding is inevitably thin in diameter and is fine using a low-profile connector.
On the other hand, as a matter of course, it is necessary to feed power to the millimeter wave radio apparatus. However, since the space of the hinge portion is limited as described above, it is difficult to provide a new feeder line (coaxial cable). Therefore, it is desirable to share an existing coaxial cable (for example, a coaxial cable for passing a 2.4 GHz band and a 5 GHz band for a wireless LAN) with the millimeter wave radio apparatus for power supply to the millimeter wave radio apparatus.
However, the coaxial cable shared for power feeding to the millimeter wave radio apparatus is fine as described above. FIG. 9 is a graph showing an example of loss characteristics of a fine coaxial cable with a connector. As can be seen from FIG. 9, the loss of the coaxial cable gradually increases as the frequency increases and rapidly increases when the frequency exceeds a predetermined frequency.
FIG. 10 is a graph showing the relationship between coaxial cable loss and signal frequency arrangement. The loss characteristic of the coaxial cable in FIG. 10 is assumed to be equal to the loss characteristic shown in FIG. Basically, the in-band deviation Δf1 of a signal with a wide occupied bandwidth is larger than the in-band deviation of a signal with a narrow occupied bandwidth. A signal with a wide occupied bandwidth is, for example, a millimeter wave IF signal having a maximum occupied bandwidth of 2 GHz and transmitted in the 9-14 GHz band. A signal having a narrow occupied bandwidth is, for example, a microwave RF signal having an occupied bandwidth of 20 MHz or 40 MHz and transmitted in a 2.4 GHz or 5 GHz band. Furthermore, when the frequency at which a signal with a wide occupied bandwidth is transmitted is equal to or higher than the frequency at which the loss increase rate of the coaxial cable increases rapidly, the in-band deviation Δf1 becomes even larger. In the case of OFDM (Orthogonal Frequency Division Multiplexing) modulation, since the carrier wave is divided into a plurality of subcarriers, even a slightly large in-band deviation is allowed. However, in a high-speed ADC (Analog to Digital Converter) required for broadband communication, the bit resolution is small and the dynamic range cannot be taken, so the in-band deviation must be kept small.
An object of the present invention is to provide a transmission device, a transmission method, a terminal device, and a mounting method for solving the problem of reducing in-band deviation, which is more problematic in broadband transmission.
　本発明の伝送装置は、第１占有帯域幅をもつ第１信号のベースバンド処理を行う第１処理手段と、第１信号のＲＦ（Ｒａｄｉｏ　Ｆｒｅｑｕｅｎｃｙ）処理を行う第２処理手段と、第１処理手段と第２処理手段とを接続するケーブルと、を備え、第１信号と第１占有帯域幅よりも狭い第２占有帯域幅をもつ第２信号とをケーブル内を共用して伝送する際、第１信号の伝送周波数を、第２信号の伝送周波数よりも低い周波数とする。
　本発明の伝送方法は、ケーブルを介して接続される、第１占有帯域幅をもつ第１信号のベースバンド処理を行う第１処理手段と第１信号のＲＦ処理を行う第２処理手段との間の伝送方法であって、第１信号と第１占有帯域幅よりも狭い第２占有帯域幅をもつ第２信号とをケーブル内を共用して伝送する際、第１信号の伝送周波数を、第２信号の伝送周波数よりも低い周波数とする。
　本発明の端末装置は、第１占有帯域幅をもつ第１信号のベースバンド処理を行う第１処理回路が実装される本体部と、第１信号のＲＦ処理を行う第２処理回路が実装される表示部と、第１処理回路と第２処理回路とを接続するケーブルと、を備え、第１信号と第１占有帯域幅よりも狭い第２占有帯域幅をもつ第２信号とをケーブル内を共用して伝送する際、第１信号の伝送周波数を、第２信号の伝送周波数よりも低い周波数とする。
　本発明の実装方法は、第１占有帯域幅をもつ第１信号のベースバンド処理を行う第１処理回路と、第１信号のＲＦ処理を行う第２処理回路とを含む無線回路を、端末装置へ実装する実装方法であって、第１処理回路を、端末装置の本体部に実装し、第２処理回路を、端末装置の表示部に実装し、第１処理回路と第２処理回路とをケーブルにより接続し、第１信号と第１占有帯域幅よりも狭い第２占有帯域幅をもつ第２信号とをケーブル内を共用して伝送する際、第１信号の伝送周波数を、第２信号の伝送周波数よりも低い周波数とする。 The transmission apparatus of the present invention includes first processing means for performing baseband processing of a first signal having a first occupied bandwidth, second processing means for performing RF (Radio Frequency) processing of the first signal, and first processing. And a cable connecting the second processing means and the first signal and a second signal having a second occupied bandwidth that is narrower than the first occupied bandwidth, for transmission in the cable, The transmission frequency of the first signal is lower than the transmission frequency of the second signal.
The transmission method of the present invention includes a first processing unit that performs baseband processing of a first signal having a first occupied bandwidth and a second processing unit that performs RF processing of the first signal, which are connected via a cable. When transmitting a first signal and a second signal having a second occupied bandwidth that is narrower than the first occupied bandwidth in the cable, the transmission frequency of the first signal is: The frequency is lower than the transmission frequency of the second signal.
The terminal device of the present invention is mounted with a main body portion on which a first processing circuit that performs baseband processing of a first signal having a first occupied bandwidth is mounted, and a second processing circuit that performs RF processing on the first signal. And a cable for connecting the first processing circuit and the second processing circuit, and the first signal and the second signal having a second occupied bandwidth narrower than the first occupied bandwidth in the cable. When transmitting in common, the transmission frequency of the first signal is set to be lower than the transmission frequency of the second signal.
According to an embodiment of the present invention, a wireless circuit including a first processing circuit that performs baseband processing of a first signal having a first occupied bandwidth and a second processing circuit that performs RF processing of the first signal is provided as a terminal device. The first processing circuit is mounted on the main body of the terminal device, the second processing circuit is mounted on the display unit of the terminal device, and the first processing circuit and the second processing circuit are mounted. When the first signal and the second signal having a second occupied bandwidth narrower than the first occupied bandwidth are transmitted by sharing in the cable, the transmission frequency of the first signal is set to the second signal. The frequency is lower than the transmission frequency.
　本発明によれば、広帯域伝送においてより問題となる帯域内偏差を軽減させることができる。 According to the present invention, it is possible to reduce in-band deviation, which is more problematic in broadband transmission.
本発明の第１の実施形態に係る伝送装置の構成例を説明するブロック図である。It is a block diagram explaining the structural example of the transmission apparatus which concerns on the 1st Embodiment of this invention. 本発明の第２の実施形態に係る無線装置の構成例を説明するブロック図である。It is a block diagram explaining the structural example of the radio | wireless apparatus which concerns on the 2nd Embodiment of this invention. 本発明の第３の実施形態に係る無線装置の構成例を説明するブロック図である。It is a block diagram explaining the structural example of the radio | wireless apparatus which concerns on the 3rd Embodiment of this invention. 本発明の第４の実施形態に係る無線装置の構成例を説明するブロック図である。It is a block diagram explaining the structural example of the radio | wireless apparatus which concerns on the 4th Embodiment of this invention. 本発明の第５の実施形態に係る無線装置の構成例を説明するブロック図である。It is a block diagram explaining the structural example of the radio | wireless apparatus which concerns on the 5th Embodiment of this invention. 本発明の第６の実施形態に係る無線装置の構成例を説明するブロック図である。It is a block diagram explaining the structural example of the radio | wireless apparatus which concerns on the 6th Embodiment of this invention. 第２の実施形態における、同軸ケーブル損失と信号の周波数配置の関係を示すグラフである。It is a graph which shows the relationship between the coaxial cable loss and the signal frequency arrangement in the second embodiment. 第５の実施形態における、同軸ケーブル損失と信号の周波数配置の関係を示すグラフである。It is a graph which shows the relationship between the coaxial cable loss and the signal frequency arrangement in the fifth embodiment. 同軸ケーブルの損失特性例を示すグラフである。It is a graph which shows the example of the loss characteristic of a coaxial cable. 同軸ケーブル損失と信号の周波数配置の関係を示すグラフである。It is a graph which shows the relationship between coaxial cable loss and signal frequency arrangement. スーパーヘテロダイン方式の無線装置のノートパソコンへの実装例である。This is an example of mounting a superheterodyne wireless device on a notebook computer.
　［第１の実施形態］
　図１は、本発明の第１の実施形態に係る伝送装置２０の構成例を説明するブロック図である。伝送装置２０は、第１処理部２２と第２処理部２４とを備える。第１処理部２２と第２処理部２４とは、ケーブル２６により接続される。例えば、第１処理部２２は端末装置３０の本体部３２に実装され、第２処理部２４は表示部３４に実装される。
　第１処理部２２は、第１占有帯域幅をもつ第１信号のベースバンド処理を少なくとも実行する。第２処理部２４は、第１信号のＲＦ（Ｒａｄｉｏ　Ｆｒｅｑｕｅｎｃｙ）処理を少なくとも実行する。
　なお、第１信号を例えばミリ波無線通信に用いる信号とし、第２信号を例えば無線ＬＡＮ（Ｌｏｃａｌ　Ａｒｅａ　Ｎｅｔｗｏｒｋ）の信号とすることができる。また、ケーブル２６は、例えば、同軸ケーブルとすることができる。
　上記構成において、第１信号と第１占有帯域幅よりも狭い第２占有帯域幅をもつ第２信号とをケーブル２６内を共用して伝送する際、第１信号の伝送周波数を、第２信号の伝送周波数よりも低い周波数とする。
　ここで、ケーブル２６が、例えば、微細な同軸ケーブル（例えば、低背なコネクタを有する同軸ケーブル）である場合、図９を用いて説明したように、その微細な同軸ケーブルの損失の増加率は、所定の周波数を越えると急激に増大する。従って、占有帯域幅の広い信号を高い周波数（この場合、同軸ケーブルの損失の増加率が増大する周波数以上の周波数）で伝送させる場合の帯域内偏差よりも、低い周波数で伝送させる場合の帯域内偏差の方が小さくなる。
　以上説明した第１の実施形態によれば、広い占有帯域幅を有する信号は低い周波数で伝送されるため、広帯域伝送においてより問題となる帯域内偏差を小さくすることができる。
　［第２の実施の形態］
　図２は、本発明の第２の実施形態に係る無線装置（伝送装置）の構成例を説明するブロック図である。図２は、この無線装置を、例えば、本体部１と表示部２とで構成される端末装置（例えば、ノートパソコン）に適用した場合を示す。
　本体部１は、占有帯域幅が狭い信号（例えば無線ＬＡＮの信号）を扱うベースバンド回路４ａと、変復調器５ａと、ＲＦフロントエンド６ａとを備える。本体部１は、さらに、占有帯域幅が広い信号（ミリ波無線通信に用いる信号）を扱うベースバンド回路４ｂと、変復調器５ｂと、共用器７とを備える。表示部２は、共用器８と、ミリ波用のＲＦフロントエンド６ｂと、アンテナ９ａ（第１アンテナ）と、アンテナ９ｂ（第２アンテナ）とを備える。本体部１の共用器７と表示部２の共用器８は、同軸ケーブル１０（ケーブル）を介して接続される。
　本体部１の共用器７は、ＲＦフロントエンド６ａからのＲＦ出力信号と変復調器５ｂからのＩＦ出力信号とを１本の信号に重畳する。そして、共用器７は、重畳された信号を、同軸ケーブル１０を介して、表示部２の共用器８に伝送する。共用器８は、重畳された信号からＲＦ出力信号とＩＦ出力信号を分離する。ＲＦ出力信号は、アンテナ９ａから送信される。一方、ＩＦ出力信号は、ミリ波用のＲＦフロントエンド６ｂでＲＦ出力信号にアップコンバートされ、アンテナ９ｂから送信される。
　ここで、ＲＦフロントエンド６ａからのＲＦ出力信号は、例えば２．４ＧＨｚ帯または５ＧＨｚ帯である。一方、変復調器５ｂから出力されるＩＦ出力信号は、２．４ＧＨｚよりも低い、例えば２ＧＨｚまでの信号とする。この結果、占有帯域幅の広いＩＦ出力信号（例えば、２ＧＨｚ／１チャネル）は低い周波数で、占有帯域幅の狭い２．４ＧＨｚ帯および５ＧＨｚ帯のＲＦ出力信号（例えば、２０ＭＨｚまたは４０ＭＨｚ）は高い周波数で、各々に同軸ケーブル１０中を伝送する。
　図７は、第２の実施形態における、同軸ケーブル損失と信号の周波数配置の関係を示すグラフである。ここで、この図７と図１０とを比較する。この場合、図７と図１０の同軸ケーブルの損失特性は等しいものとする。図７に示す帯域内偏差Δｆ２は、図１０に示す帯域内偏差Δｆ１よりも大幅に小さい。その理由について説明する。図９を用いて説明したように、微細な同軸ケーブル（例えば、低背なコネクタを有する同軸ケーブル）の損失の増加率は、所定の周波数を越えると急激に増大する。従って、占有帯域幅の広い信号を高い周波数（この場合、同軸ケーブルの損失の増加率が増大する周波数以上の周波数）で伝送させる場合の帯域内偏差Δｆ１（図１０参照）よりも、低い周波数で伝送させる場合の帯域内偏差Δｆ２（図７参照）の方が小さくなる。
　すなわち、以上説明した第２の実施形態によれば、広い占有帯域幅を有する信号は低い周波数で伝送されるため、広帯域伝送においてより問題となる帯域内偏差を小さくすることができる。
　なお、上記の説明および以下で説明する第３~第６の実施形態において、「占有帯域幅が広い信号」および「占有帯域幅が狭い信号」とは、一方の信号の占有帯域幅が他方の信号の占有帯域幅よりも「相対的」に広いこと（あるいは狭いこと）を意味している。信号の占有帯域幅はこの条件さえ満足すれば十分であって、それぞれの信号の具体的な占有帯域幅は上記に限定されない。また、「高い周波数」と「低い周波数」についても上記と同様であり、一方の信号の周波数が他方の信号の周波数よりも「相対的」に高いこと（あるいは低いこと）を意味している。この場合も、信号の周波数はこの条件さえ満足されれば十分であって、それぞれの信号の具体的な周波数は上記に限定されない。
　また、以上の説明では、占有帯域幅が広い信号を、占有帯域幅が狭い信号を伝送する周波数よりも低い周波数で伝送させる場合を例に挙げたが、これに限定されない。例えば、同軸ケーブルの損失の増加率が一定の周波数範囲内であり且つ占有帯域幅の狭い信号を伝送する周波数とコンフリクトしなければ、占有帯域幅が広い信号を、占有帯域幅の狭い信号を伝送する周波数よりも高い周波数で伝送させてもよい。このことは以下に説明する第３~第６の実施形態でも同様である。
　［第３の実施の形態］
　図３は、本発明の第３の実施形態に係る無線装置（伝送装置）の構成例を説明するブロック図である。図３は、この無線装置を、例えば、本体部１と表示部２とで構成される端末装置（例えば、ノートパソコン）に適用した場合を示す。
　本体部１は、ベースバンド回路４ｃと、変復調器５ｃとを備える。表示部２は、共用器８と、ＲＦフロントエンド６ａと、ミリ波用のＲＦフロントエンド６ｂと、アンテナ９ａと、アンテナ９ｂとを備える。本体部１の変復調器５ｃと表示部２の共用器８は、同軸ケーブル１０を介して接続される。
　ベースバンド回路４ｃは、占有帯域幅の狭い信号と占有帯域幅の広い信号とのそれぞれのベースバンド信号を、変復調器５ｃに対して出力する。占有帯域幅の狭い信号は、例えば、無線ＬＡＮの信号であり、占有帯域幅の広い信号は、例えば、ミリ波無線通信に用いる信号である。また、ベースバンド回路４ｃと変復調器５ｃとのインタフェースが１本の場合、ベースバンド回路４ｃは、両ベースバンド信号を時間分割に出力する。
　変復調器５ｃは、占有帯域幅の狭い信号のＩＦ信号と占有帯域幅が広い信号のＩＦ信号とを含むＩＦ出力信号を出力する。ここで、占有帯域幅の狭い信号のＩＦ信号の周波数は、占有帯域幅の広い信号のＩＦ信号の周波数よりも高く設定されている。ＩＦ出力信号は、同軸ケーブル１０を介して、表示部２に搭載された共用器８に伝送される。ＩＦ出力信号は、共用器８で周波数に応じて分離される。占有帯域幅の狭い信号のＩＦ出力信号は、ＲＦフロントエンド６ａでＲＦ信号にアップコンバートされ、アンテナ９ａで送信される。一方、占有帯域幅の広い信号のＩＦ出力信号は、ミリ波用のＲＦフロントエンド６ｂでＲＦ信号にアップコンバートされ、アンテナ９ｂで送信される。
　この結果、第３の実施形態の場合も第２の実施形態と同様に、占有帯域幅が広い信号は低い周波数で、占有帯域幅が狭い信号は高い周波数で、各々に同軸ケーブル１０中を伝送する。
　従って、第３の実施形態によれば、第２の実施形態と同様に、広帯域伝送においてより問題となる帯域内偏差を小さくすることができる。なお、第３の実施形態において、帯域内偏差を小さくすることができる理由については第２の実施形態と同様であるので、ここでの説明は省略する。
　さらに、第３の実施形態によれば、ベースバンド回路や変復調器を共用することができるため、構成を簡易なものとすることができる。
　なお、変復調器５ｃは、占有帯域幅が狭い信号に関して、上述したように、ベースバンド信号からＩＦ信号へ周波数を変更する機能を備える。しかしながら、変復調器５ｃは、ＩＦ信号を生成せずに、ベースバンド信号から直接ＲＦ信号を生成してもよい。すなわち、ダイレクトコンバージョン方式に対応することができる。この場合、表示部２側のＲＦフロントエンド６ａは、ＲＦ信号を直接受信できるので周波数変更機能を搭載する必要がなく、従って、回路構成を簡素なものとすることができる（例えば、増幅器、フィルタおよびスイッチなどのみで構成することができる）。
　また、以上の説明では、送信時の動作を例に挙げたが、受信時においては、信号は上記と逆方向に伝送される。説明が冗長となることを避けるため、受信時の動作説明については省略する。
　［第４の実施の形態］
　図４は、本発明の第４の実施形態に係る無線装置（伝送装置）の構成例を説明するブロック図である。図４は、この無線装置を、例えば、本体部１と表示部２とで構成される端末装置（例えば、ノートパソコン）に適用した場合を示す。
　本体部１は、占有帯域幅が狭い信号（例えば無線ＬＡＮの信号）を扱うベースバンド回路４ａと、変復調器５ａと、ＲＦフロントエンド６ａと、占有帯域幅が広い信号（例えばミリ波無線に用いる信号）を扱うベースバンド回路４ｂと、共用器７とを備える。表示部２は、共用器８と、変復調器５ｂと、ミリ波用のＲＦフロントエンド６ｂと、アンテナ９ａと、アンテナ９ｂとを備える。本体部１の共用器７と表示部２の共用器８は、同軸ケーブル１０を介して接続される。
　本体部１の共用器７は、ＲＦフロントエンド６ａからのＲＦ出力信号とベースバンド回路４ｂからのベースバンド出力信号を重畳する。そして、共用器７は、重畳された信号を、同軸ケーブル１０を介して、表示部２の共用器８に伝送する。共用器８で分離されたＲＦ出力信号は、アンテナ９ａで送信される。一方、共用器８で分離されたベースバンド出力信号は、変復調器５ｂを介してミリ波用のＲＦフロントエンド６ｂでアップコンバートされ、アンテナ９ｂで送信される。
　ここで、ＲＦフロントエンド６ａからのＲＦ出力信号は、例えば２．４ＧＨｚ帯または５ＧＨｚ帯である。一方、ベースバンド回路４ｂから出力されるベースバンド出力信号は、２．４ＧＨｚよりも低い、例えば２ＧＨｚまでの信号とする。この結果、占有帯域幅の広い（例えば、２ＧＨｚ）ベースバンド出力信号は低い周波数で、占有帯域幅の狭い（例えば、２０ＭＨｚまたは４０ＭＨｚ）２．４ＧＨｚ帯および５ＧＨｚ帯のＲＦ出力信号は高い周波数で、各々が同軸ケーブル１０中を伝送される。ここで、本構成において、同軸ケーブルを通過させる周波数は、無線ＬＡＮのＲＦ周波数が上限となるため、ミリ波無線のベースバンド信号と共用化させたとしても特別な同軸ケーブルを選択する必要がなく、低コスト化にも寄与できる。
　従って、第４の実施形態によれば、第２および第３の実施形態と同様に、広帯域伝送においてより問題となる帯域内偏差を小さくすることができる。なお、第４の実施形態において、帯域内偏差を小さくすることができる理由については第２の実施形態と同様であるので、ここでの説明は省略する。
　さらに、第４の実施形態によれば、ＩＦ信号だけではなくベースバンド信号も同軸ケーブルで送ることができるのでより選択の範囲を拡げることが可能となる。
　なお、ダイレクトコンバージョン方式の場合、ＲＦフロントエンド６ｂに周波数変換機能を設ける必要はない。
　なお、以上の説明では、送信時の動作を例に挙げたが、受信時においては、信号は上記と逆方向に伝送される。説明が冗長となることを避けるため、受信時の動作説明については省略する。
　［第５の実施の形態］
　図５は、本発明の第５の実施形態に係る無線装置（伝送装置）の構成例を説明するブロック図である。図５は、この無線装置を、例えば、本体部１と表示部２とで構成される端末装置（例えば、ノートパソコン）に適用した場合を示す。
　本体部１は、占有帯域幅が狭い信号（例えば無線ＬＡＮの信号）を扱うベースバンド回路４ａと、変復調器５ａと、ＲＦフロントエンド６ａとを備える。本体部１は、さらに、占有帯域幅が広い信号（例えばミリ波無線に用いる信号）を扱うベースバンド回路４ｂと、共有器７−１と、共用器７−２とを備える。表示部２は、共用器８−１と、共用器８−２と、変復調器５ｂと、ミリ波用のＲＦフロントエンド６ｂと、アンテナ９ａ−１と、９ａ−２と、アンテナ９ｂとを備える。本体部１の共用器７−１と表示部２の共用器８−１は、同軸ケーブル１０−１を介して接続される。本体部１の共用器７−２と表示部２の共用器８−２は、同軸ケーブル１０−２を介して接続される。
　ここで、無線ＬＡＮは、ＭＩＭＯ（Ｍｕｌｔｉｐｌｅ　Ｉｎｐｕｔ　Ｍｕｌｔｉｐｌｅ　Ｏｕｔｐｕｔ）に対応している。従って、ＲＦフロントエンド６ａからのＲＦ出力信号は、チャンネル１（Ｃｈ１）とチャンネル２（Ｃｈ２）に分けられる。一方、ベースバンド回路４ｂからのベースバンド信号は、直交信号ＩｃｈとＱｃｈに分けられている。Ｃｈ１とＩｃｈは共用器７−１により重畳される。この重畳信号は、同軸ケーブル１０−１を介して、表示部２の共用器８−１に伝送される。一方、Ｃｈ２とＱｃｈは共用器７−２により重畳される。この重畳信号は、同軸ケーブル１０−２を介して、表示部２の共用器８−２に伝送される。
　共用器８−１、８−２で分離されたＲＦ信号（Ｃｈ１、Ｃｈ２）は、各々に、アンテナ９ａ−１、９ａ−２で送信される。一方、ベースバンド信号（Ｉｃｈ、Ｑｃｈ）は、各々に、変復調器５ｂで変調された後にＲＦフロントエンド６ｂでアップコンバートされ、アンテナ９ｂで送出される。
　ここで、ＲＦフロントエンド６ａからのＲＦ出力信号は、例えば２．４ＧＨｚ帯または５ＧＨｚ帯である。一方、ベースバンド回路４ｂから出力されるベースバンド出力信号は、２．４ＧＨｚよりも低い、例えば１ＧＨｚまでの信号とする。ここで、ベースバンド信号として直交信号を用いるので、ミリ波無線に用いる信号の占有帯域幅は、第２~第４の実施形態の占有帯域幅に比べて約半分となる。
　図８は、第５の実施形態における、同軸ケーブル損失と信号の周波数配置の関係を示すグラフである。ここで、この図８と図７（第２~第４の実施形態におけるグラフ）とを比較する。この場合、図８と図７の同軸ケーブルの損失特性は等しいものとする。上述したとおり、直交信号は、ＲＦ信号やＩＦ信号に比べ占有帯域幅はおよそ半分（例えば、２ＧＨｚ→１ＧＨｚ）になる。従って、図８に示す帯域内偏差Δｆ３も図７に示す帯域内偏差Δｆ２に比べより小さくなる。
　以上説明した第５の実施形態によれば、第２の実施形態と同様に、広い占有帯域幅を有する信号は低い周波数で伝送されるため、広帯域伝送においてより問題となる帯域内偏差を小さくすることができる。
　さらに、第５の実施形態によれば、ベースバンド信号として直交信号を用いるので、帯域内偏差をより一層小さくすることが可能となる。
　なお、以上の説明では、送信時の動作を例に挙げたが、受信時においては、信号は上記と逆方向に伝送される。説明が冗長となることを避けるため、受信時の動作説明については省略する。
　また、ＲＦフロントエンド６ａから出力（あるいは、ＲＦフロントエンド６ａへ入力）するＲＦ信号の数（チャンネル数）は、固定ではなく、ＭＩＭＯの仕様によって変わる。また、ベースバンド回路４ｂから出力（あるいは、ベースバンド回路４ｂへ入力）するベースバンド信号の数も、固定ではなく、差動配線を採用する場合や送受別配線にする場合などの仕様によって変わる。したがって、同軸ケーブル１０の数や同軸ケーブルの一部または全部を共用するかどうかは設計事項であり、任意に変更可能である。
　また、第５の実施形態では、２．４ＧＨｚや５ＧＨｚのアンテナ、およびミリ波のアンテナの一部が少なくとも表示部２にあることが要件となるが、全てが表示部２にある必要はなく、残りが本体部１にあってもよい。
　［第６の実施の形態］
　図６は、本発明の第６の実施形態に係る無線装置（伝送装置）の構成例を説明するブロック図である。図６は、この無線装置を、例えば、本体部１と表示部２とで構成される情報端末（例えば、ノートパソコン）に適用した場合を示す。
　第６の実施形態は、第５の実施形態（図５参照）に対して、表示部２の構成が異なる。第５の実施形態の表示部２において、共用器８−１、８−２から出力される直交信号Ｉｃｈ、Ｑｃｈが、変復調器５ｂ−１、５ｂ−２の２系統に分けられ、ＲＦフロントエンド６ｂ−１、６ｂ−２で変調およびアップコンバートされ、アンテナ９ｂ−１、９ｂ−２で出力される。本体部１の構成は、第５の実施形態と同一である。
　第６の実施形態によれば、以上説明した第２~第５の実施形態と同様に、広い占有帯域幅を有する信号は低い周波数で伝送されるため、広帯域伝送でより問題となる帯域内偏差を小さくすることができる。
　さらに、第６の実施形態によれば、第５の実施形態と同様に、ベースバンド信号として直交信号を用いるので、帯域内偏差をより一層小さくすることが可能となる。
　さらに、第６の実施形態の場合、ＲＦフロントエンド６ｂ−１とアンテナ９ｂ−１からなる組と、ＲＦフロントエンド６ｂ−２とアンテナ９ｂ−２からなる組とを、表示部２内で離して設置することができる。従って、通信経路での遮蔽やダイバーシチ効果を得ることも可能である。さらに、このような構成では、ミリ波のような高い周波数で信号を引きまわす必要はない。
　なお、以上の説明では、送信時の動作を例に挙げたが、受信時においては、信号は上記と逆方向に伝送される。説明が冗長となることを避けるため、受信時の動作説明については省略する。
　また、ＲＦフロントエンド６ａから出力（あるいは、ＲＦフロントエンド６ａへ入力）するＲＦ信号の数（チャンネル数）は、固定ではなく、ＭＩＭＯの仕様によって変わる。また、ベースバンド回路４ｂから出力（あるいは、ベースバンド回路４ｂへ入力）するベースバンド信号の数も、固定ではなく、差動配線を採用する場合や送受別配線にする場合などの仕様によって変わる。すなわち、同軸ケーブル１０の数や同軸ケーブルの一部または全部を共用するかどうかは設計事項であり、任意に変更可能である。
　また、第６の実施形態では、２．４ＧＨｚや５ＧＨｚのアンテナ、およびミリ波のアンテナの一部が少なくとも表示部２にあることが要件となるが、全てが表示部２にある必要はなく、残りが本体部１にあってもよい。
　なお、以上説明した第２~第６の実施形態の無線装置は、ノートパソコンに限らず、他の機器（例えば、携帯電話機やＰＤＡ（Ｐｅｒｓｏｎａｌ　Ｄｉｇｉｔａｌ　Ａｓｓｉｓｔａｎｔｓ））にも適用可能であることは説明するまでもない。
　以上、実施形態を参照して本願発明を説明したが、本願発明は上述した実施形態に限定されるものではない。本願発明の構成や詳細には、本願発明のスコープ内で当業者が理解し得る様々な変更をすることができる。
　この出願は、２０１０年９月１日に出願された日本出願特願２０１０−１９５３６９を基礎とする優先権を主張し、その開示の全てをここに取り込む。 [First Embodiment]
FIG. 1 is a block diagram illustrating a configuration example of a transmission apparatus 20 according to the first embodiment of the present invention. The transmission device 20 includes a first processing unit 22 and a second processing unit 24. The first processing unit 22 and the second processing unit 24 are connected by a cable 26. For example, the first processing unit 22 is mounted on the main body unit 32 of the terminal device 30, and the second processing unit 24 is mounted on the display unit 34.
The first processing unit 22 executes at least baseband processing of the first signal having the first occupied bandwidth. The second processing unit 24 executes at least RF (Radio Frequency) processing of the first signal.
The first signal may be a signal used for, for example, millimeter-wave wireless communication, and the second signal may be a wireless LAN (Local Area Network) signal, for example. The cable 26 can be a coaxial cable, for example.
In the above configuration, when the first signal and the second signal having the second occupied bandwidth narrower than the first occupied bandwidth are transmitted through the cable 26, the transmission frequency of the first signal is set to the second signal. The frequency is lower than the transmission frequency.
Here, when the cable 26 is, for example, a fine coaxial cable (for example, a coaxial cable having a low-profile connector), as described with reference to FIG. 9, the increase rate of the loss of the fine coaxial cable is When the frequency exceeds a predetermined frequency, it rapidly increases. Therefore, within a band when transmitting a signal with a wide occupied bandwidth at a frequency lower than the in-band deviation when transmitting at a high frequency (in this case, a frequency higher than the frequency at which the rate of increase in loss of the coaxial cable increases). Deviation is smaller.
According to the first embodiment described above, since a signal having a wide occupied bandwidth is transmitted at a low frequency, an in-band deviation that is more problematic in broadband transmission can be reduced.
[Second Embodiment]
FIG. 2 is a block diagram illustrating a configuration example of a radio apparatus (transmission apparatus) according to the second embodiment of the present invention. FIG. 2 shows a case where this wireless device is applied to a terminal device (for example, a notebook computer) composed of, for example, a main body 1 and a display unit 2.
The main body 1 includes a baseband circuit 4a that handles a signal with a small occupied bandwidth (for example, a wireless LAN signal), a modulator / demodulator 5a, and an RF front end 6a. The main unit 1 further includes a baseband circuit 4b that handles a signal with a wide occupied bandwidth (a signal used for millimeter-wave wireless communication), a modem 5b, and a duplexer 7. The display unit 2 includes a duplexer 8, an RF front end 6b for millimeter waves, an antenna 9a (first antenna), and an antenna 9b (second antenna). The duplexer 7 of the main unit 1 and the duplexer 8 of the display unit 2 are connected via a coaxial cable 10 (cable).
The duplexer 7 of the main body 1 superimposes the RF output signal from the RF front end 6a and the IF output signal from the modem 5b on one signal. Then, the duplexer 7 transmits the superimposed signal to the duplexer 8 of the display unit 2 through the coaxial cable 10. The duplexer 8 separates the RF output signal and the IF output signal from the superimposed signal. The RF output signal is transmitted from the antenna 9a. On the other hand, the IF output signal is up-converted to an RF output signal by the millimeter wave RF front end 6b and transmitted from the antenna 9b.
Here, the RF output signal from the RF front end 6a is, for example, the 2.4 GHz band or the 5 GHz band. On the other hand, the IF output signal output from the modem 5b is a signal lower than 2.4 GHz, for example, up to 2 GHz. As a result, the IF output signal with a wide occupied bandwidth (for example, 2 GHz / 1 channel) has a low frequency, and the 2.4 GHz band and the 5 GHz band with a small occupied bandwidth have a high frequency (for example, 20 MHz or 40 MHz). Then, the signal is transmitted through the coaxial cable 10.
FIG. 7 is a graph showing the relationship between the coaxial cable loss and the signal frequency arrangement in the second embodiment. Here, FIG. 7 and FIG. 10 are compared. In this case, it is assumed that the loss characteristics of the coaxial cables of FIGS. 7 and 10 are equal. The in-band deviation Δf2 shown in FIG. 7 is significantly smaller than the in-band deviation Δf1 shown in FIG. The reason will be described. As described with reference to FIG. 9, the increase rate of the loss of a fine coaxial cable (for example, a coaxial cable having a low-profile connector) increases rapidly when a predetermined frequency is exceeded. Accordingly, a signal having a wide occupied bandwidth is transmitted at a frequency lower than the in-band deviation Δf1 (see FIG. 10) when transmitting a signal at a high frequency (in this case, a frequency equal to or higher than the frequency at which the increase rate of loss of the coaxial cable increases). The in-band deviation Δf2 (see FIG. 7) when transmitting is smaller.
That is, according to the second embodiment described above, since a signal having a wide occupied bandwidth is transmitted at a low frequency, the in-band deviation that is more problematic in wideband transmission can be reduced.
In the above description and the third to sixth embodiments described below, “a signal with a wide occupied bandwidth” and “a signal with a narrow occupied bandwidth” mean that the occupied bandwidth of one signal is the other. It means that it is "relatively" wider (or narrower) than the occupied bandwidth of the signal. It is sufficient that the occupied bandwidth of the signal satisfies this condition, and the specific occupied bandwidth of each signal is not limited to the above. The same applies to “high frequency” and “low frequency”, which means that the frequency of one signal is “relatively” higher (or lower) than the frequency of the other signal. Also in this case, it is sufficient that the frequency of the signal satisfies this condition, and the specific frequency of each signal is not limited to the above.
In the above description, a case where a signal with a large occupied bandwidth is transmitted at a frequency lower than a frequency at which a signal with a small occupied bandwidth is transmitted is described as an example, but the present invention is not limited to this. For example, if the rate of increase in loss of coaxial cable is within a certain frequency range and does not conflict with the frequency of transmitting a signal with a small occupied bandwidth, a signal with a large occupied bandwidth is transmitted and a signal with a small occupied bandwidth is transmitted. It may be transmitted at a frequency higher than the frequency to be transmitted. The same applies to the third to sixth embodiments described below.
[Third Embodiment]
FIG. 3 is a block diagram illustrating a configuration example of a radio apparatus (transmission apparatus) according to the third embodiment of the present invention. FIG. 3 shows a case where this wireless device is applied to a terminal device (for example, a notebook personal computer) composed of, for example, a main body 1 and a display 2.
The main body 1 includes a baseband circuit 4c and a modem 5c. The display unit 2 includes a duplexer 8, an RF front end 6a, an RF front end 6b for millimeter waves, an antenna 9a, and an antenna 9b. The modem 5 c of the main body 1 and the duplexer 8 of the display unit 2 are connected via a coaxial cable 10.
The baseband circuit 4c outputs a baseband signal of a signal with a narrow occupied bandwidth and a signal with a wide occupied bandwidth to the modem 5c. A signal with a small occupied bandwidth is, for example, a wireless LAN signal, and a signal with a large occupied bandwidth is, for example, a signal used for millimeter-wave wireless communication. Further, when the interface between the baseband circuit 4c and the modem 5c is one, the baseband circuit 4c outputs both baseband signals in a time division manner.
The modem 5c outputs an IF output signal including an IF signal having a narrow occupied bandwidth and an IF signal having a wide occupied bandwidth. Here, the frequency of the IF signal of the signal having a narrow occupied bandwidth is set higher than the frequency of the IF signal of the signal having a wide occupied bandwidth. The IF output signal is transmitted to the duplexer 8 mounted on the display unit 2 via the coaxial cable 10. The IF output signal is separated by the duplexer 8 according to the frequency. The IF output signal having a narrow occupied bandwidth is up-converted to an RF signal by the RF front end 6a and transmitted by the antenna 9a. On the other hand, the IF output signal having a wide occupied bandwidth is up-converted to an RF signal by the millimeter wave RF front end 6b and transmitted by the antenna 9b.
As a result, in the case of the third embodiment, similarly to the second embodiment, a signal with a wide occupied bandwidth is transmitted through the coaxial cable 10 at a low frequency, and a signal with a small occupied bandwidth is transmitted at a high frequency. To do.
Therefore, according to the third embodiment, as in the second embodiment, it is possible to reduce the in-band deviation that is more problematic in wideband transmission. In the third embodiment, the reason why the in-band deviation can be reduced is the same as in the second embodiment, and thus the description thereof is omitted here.
Furthermore, according to the third embodiment, since the baseband circuit and the modem can be shared, the configuration can be simplified.
The modem 5c has a function of changing the frequency from the baseband signal to the IF signal as described above with respect to a signal having a small occupied bandwidth. However, the modem 5c may generate the RF signal directly from the baseband signal without generating the IF signal. That is, the direct conversion method can be supported. In this case, since the RF front end 6a on the display unit 2 side can directly receive the RF signal, it is not necessary to mount a frequency changing function, and therefore the circuit configuration can be simplified (for example, an amplifier, a filter, etc.). And can consist of only switches etc.).
In the above description, the operation at the time of transmission is taken as an example, but at the time of reception, the signal is transmitted in the reverse direction. In order to avoid redundant description, description of operation at the time of reception is omitted.
[Fourth Embodiment]
FIG. 4 is a block diagram illustrating a configuration example of a radio apparatus (transmission apparatus) according to the fourth embodiment of the present invention. FIG. 4 shows a case where this wireless device is applied to a terminal device (for example, a notebook personal computer) composed of, for example, the main body 1 and the display 2.
The main unit 1 is used for a baseband circuit 4a that handles a signal with a small occupied bandwidth (for example, a wireless LAN signal), a modem 5a, an RF front end 6a, and a signal with a large occupied bandwidth (for example, millimeter-wave radio). A baseband circuit 4b for handling signals) and a duplexer 7. The display unit 2 includes a duplexer 8, a modem 5b, a millimeter wave RF front end 6b, an antenna 9a, and an antenna 9b. The duplexer 7 of the main body 1 and the duplexer 8 of the display unit 2 are connected via a coaxial cable 10.
The duplexer 7 of the main body 1 superimposes the RF output signal from the RF front end 6a and the baseband output signal from the baseband circuit 4b. Then, the duplexer 7 transmits the superimposed signal to the duplexer 8 of the display unit 2 through the coaxial cable 10. The RF output signal separated by the duplexer 8 is transmitted by the antenna 9a. On the other hand, the baseband output signal separated by the duplexer 8 is up-converted by the millimeter wave RF front end 6b via the modulator / demodulator 5b and transmitted by the antenna 9b.
Here, the RF output signal from the RF front end 6a is, for example, the 2.4 GHz band or the 5 GHz band. On the other hand, the baseband output signal output from the baseband circuit 4b is a signal lower than 2.4 GHz, for example, up to 2 GHz. As a result, baseband output signals with a large occupied bandwidth (eg 2 GHz) are at low frequencies, and 2.4 GHz and 5 GHz band RF output signals with a narrow occupied bandwidth (eg 20 MHz or 40 MHz) are at high frequencies, Each is transmitted through the coaxial cable 10. Here, in this configuration, since the RF frequency of the wireless LAN is the upper limit for the frequency that passes through the coaxial cable, there is no need to select a special coaxial cable even if it is shared with the baseband signal of millimeter wave radio. It can also contribute to cost reduction.
Therefore, according to the fourth embodiment, as in the second and third embodiments, it is possible to reduce the in-band deviation which is more problematic in wideband transmission. In the fourth embodiment, the reason why the in-band deviation can be reduced is the same as that in the second embodiment, and thus the description thereof is omitted here.
Furthermore, according to the fourth embodiment, not only the IF signal but also the baseband signal can be sent by the coaxial cable, so that the selection range can be further expanded.
In the case of the direct conversion method, it is not necessary to provide a frequency conversion function in the RF front end 6b.
In the above description, the operation at the time of transmission is taken as an example, but at the time of reception, the signal is transmitted in the reverse direction. In order to avoid redundant description, description of operation at the time of reception is omitted.
[Fifth Embodiment]
FIG. 5 is a block diagram illustrating a configuration example of a radio apparatus (transmission apparatus) according to the fifth embodiment of the present invention. FIG. 5 shows a case where this wireless device is applied to a terminal device (for example, a notebook computer) composed of, for example, the main body 1 and the display 2.
The main body 1 includes a baseband circuit 4a that handles a signal with a small occupied bandwidth (for example, a wireless LAN signal), a modulator / demodulator 5a, and an RF front end 6a. The main body 1 further includes a baseband circuit 4b that handles a signal with a wide occupied bandwidth (for example, a signal used for millimeter wave radio), a duplexer 7-1, and a duplexer 7-2. The display unit 2 includes a duplexer 8-1, a duplexer 8-2, a modem 5b, a millimeter wave RF front end 6b, antennas 9a-1, 9a-2, and an antenna 9b. . The duplexer 7-1 of the main body 1 and the duplexer 8-1 of the display unit 2 are connected via a coaxial cable 10-1. The duplexer 7-2 of the main body 1 and the duplexer 8-2 of the display unit 2 are connected via a coaxial cable 10-2.
Here, the wireless LAN corresponds to MIMO (Multiple Input Multiple Output). Therefore, the RF output signal from the RF front end 6a is divided into channel 1 (Ch1) and channel 2 (Ch2). On the other hand, the baseband signal from the baseband circuit 4b is divided into orthogonal signals Ich and Qch. Ch1 and Ich are superimposed by the duplexer 7-1. This superimposed signal is transmitted to the duplexer 8-1 of the display unit 2 through the coaxial cable 10-1. On the other hand, Ch2 and Qch are superimposed by the duplexer 7-2. This superimposed signal is transmitted to the duplexer 8-2 of the display unit 2 through the coaxial cable 10-2.
The RF signals (Ch1, Ch2) separated by the duplexers 8-1, 8-2 are transmitted to the antennas 9a-1, 9a-2, respectively. On the other hand, the baseband signals (Ich, Qch) are respectively modulated by the modem 5b, up-converted by the RF front end 6b, and transmitted by the antenna 9b.
Here, the RF output signal from the RF front end 6a is, for example, the 2.4 GHz band or the 5 GHz band. On the other hand, the baseband output signal output from the baseband circuit 4b is a signal lower than 2.4 GHz, for example, up to 1 GHz. Here, since an orthogonal signal is used as the baseband signal, the occupied bandwidth of the signal used for millimeter-wave radio is about half of the occupied bandwidth of the second to fourth embodiments.
FIG. 8 is a graph showing the relationship between the coaxial cable loss and the signal frequency arrangement in the fifth embodiment. Here, FIG. 8 and FIG. 7 (graphs in the second to fourth embodiments) are compared. In this case, it is assumed that the loss characteristics of the coaxial cables of FIGS. 8 and 7 are equal. As described above, the orthogonal signal has approximately half the occupied bandwidth (for example, 2 GHz → 1 GHz) compared to the RF signal and IF signal. Therefore, the in-band deviation Δf3 shown in FIG. 8 is also smaller than the in-band deviation Δf2 shown in FIG.
According to the fifth embodiment described above, as in the second embodiment, since signals having a wide occupied bandwidth are transmitted at a low frequency, the in-band deviation that is more problematic in wideband transmission is reduced. be able to.
Furthermore, according to the fifth embodiment, since the orthogonal signal is used as the baseband signal, the in-band deviation can be further reduced.
In the above description, the operation at the time of transmission is taken as an example, but at the time of reception, the signal is transmitted in the reverse direction. In order to avoid redundant description, description of operation at the time of reception is omitted.
Further, the number of RF signals (number of channels) output from the RF front end 6a (or input to the RF front end 6a) is not fixed but varies depending on the MIMO specification. In addition, the number of baseband signals output from the baseband circuit 4b (or input to the baseband circuit 4b) is not fixed, but varies depending on specifications such as when differential wiring is used or when transmission / reception wiring is used. Therefore, the number of the coaxial cables 10 and whether a part or all of the coaxial cables are shared are design matters and can be arbitrarily changed.
Further, in the fifth embodiment, it is a requirement that a 2.4 GHz or 5 GHz antenna and a part of the millimeter wave antenna are at least in the display unit 2, but it is not necessary that all are in the display unit 2, The rest may be in the main body 1.
[Sixth Embodiment]
FIG. 6 is a block diagram illustrating a configuration example of a radio apparatus (transmission apparatus) according to the sixth embodiment of the present invention. FIG. 6 shows a case where this wireless apparatus is applied to, for example, an information terminal (for example, a notebook computer) composed of a main body 1 and a display 2.
The sixth embodiment is different from the fifth embodiment (see FIG. 5) in the configuration of the display unit 2. In the display unit 2 of the fifth embodiment, the quadrature signals Ich and Qch output from the duplexers 8-1 and 8-2 are divided into two systems of modulators / demodulators 5b-1 and 5b-2, and the RF front end. Modulated and up-converted by 6b-1 and 6b-2, and output by antennas 9b-1 and 9b-2. The configuration of the main body 1 is the same as that of the fifth embodiment.
According to the sixth embodiment, as in the second to fifth embodiments described above, since a signal having a wide occupied bandwidth is transmitted at a low frequency, the in-band deviation more problematic in wideband transmission. Can be reduced.
Furthermore, according to the sixth embodiment, as in the fifth embodiment, since the orthogonal signal is used as the baseband signal, the in-band deviation can be further reduced.
Further, in the case of the sixth embodiment, the set of the RF front end 6b-1 and the antenna 9b-1 and the set of the RF front end 6b-2 and the antenna 9b-2 are separated in the display unit 2. Can be installed. Accordingly, it is possible to obtain shielding and diversity effect in the communication path. Furthermore, in such a configuration, it is not necessary to draw a signal at a high frequency such as millimeter waves.
In the above description, the operation at the time of transmission is taken as an example, but at the time of reception, the signal is transmitted in the reverse direction. In order to avoid redundant description, description of operation at the time of reception is omitted.
Further, the number of RF signals (number of channels) output from the RF front end 6a (or input to the RF front end 6a) is not fixed but varies depending on the MIMO specification. In addition, the number of baseband signals output from the baseband circuit 4b (or input to the baseband circuit 4b) is not fixed, but varies depending on specifications such as when differential wiring is used or when transmission / reception wiring is used. That is, the number of the coaxial cables 10 and whether a part or all of the coaxial cables are shared are design matters and can be arbitrarily changed.
Further, in the sixth embodiment, it is a requirement that a 2.4 GHz or 5 GHz antenna and a part of the millimeter wave antenna are at least in the display unit 2, but it is not necessary that all are in the display unit 2, The rest may be in the main body 1.
Note that the wireless devices according to the second to sixth embodiments described above are not limited to notebook computers, but can be applied to other devices (for example, cellular phones and PDAs (Personal Digital Assistants)). Not too long.
Although the present invention has been described with reference to the embodiments, the present invention is not limited to the above-described embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.
This application claims the priority on the basis of Japanese application Japanese Patent Application No. 2010-195369 for which it applied on September 1, 2010, and takes in those the indications of all here.
　１　本体部
　２　表示部
　４ａ　ベースバンド回路（狭帯域）
　４ｂ　ベースバンド回路（広帯域）
　４ｃ　ベースバンド回路（狭／広帯域）
　５ａ、５ｂ、５ｃ　変復調器
　５ｂ−１、５ｂ−２　変復調器
　６ａ　ＲＦフロントエンド（狭帯域）
　６ｂ　ＲＦフロントエンド（広帯域）
　６ｂ−１、６ｂ−２　ＲＦフロントエンド（広帯域）
　７、７−１、７−２　共用器
　８、８−１、８−２　共用器
　９ａ　アンテナ（狭帯域）
　９ａ—１、９ａ−２　アンテナ（狭帯域）
　９ｂ　アンテナ（広帯域）
　９ｂ—１、９ｂ−２　アンテナ（広帯域）
　１０　同軸ケーブル
　１０—１、１０−２　同軸ケーブル
　２０　伝送装置
　２２　第１処理部
　２４　第２処理部
　２６　ケーブル
　３０　端末装置
　３２　本体部
　３４　表示部 1 Main body 2 Display 4a Baseband circuit (narrowband)
4b Baseband circuit (broadband)
4c Baseband circuit (narrow / broadband)
5a, 5b, 5c modem 5b-1, 5b-2 modem 6a RF front end (narrowband)
6b RF front end (broadband)
6b-1, 6b-2 RF front end (broadband)
7,7-1,7-2 duplexer 8,8-1,8-2 duplexer 9a antenna (narrowband)
9a-1, 9a-2 antenna (narrowband)
9b Antenna (broadband)
9b-1, 9b-2 antenna (broadband)
DESCRIPTION OF SYMBOLS 10 Coaxial cable 10-1, 10-2 Coaxial cable 20 Transmission apparatus 22 1st process part 24 2nd process part 26 Cable 30 Terminal apparatus 32 Main-body part 34 Display part

Claims (10)

  1. 　第１占有帯域幅をもつ第１信号のベースバンド処理を行う第１処理手段と、
    　前記第１信号のＲＦ（Ｒａｄｉｏ　Ｆｒｅｑｕｅｎｃｙ）処理を行う第２処理手段と、
    　前記第１処理手段と前記第２処理手段とを接続するケーブルと、
    　を備え、
    　前記第１信号と前記第１占有帯域幅よりも狭い第２占有帯域幅をもつ第２信号とを前記ケーブル内を共用して伝送する際、前記第１信号の伝送周波数を、前記第２信号の伝送周波数よりも低い周波数とする
    　ことを特徴とする伝送装置。     First processing means for performing baseband processing of a first signal having a first occupied bandwidth;
    Second processing means for performing RF (Radio Frequency) processing of the first signal;
    A cable connecting the first processing means and the second processing means;
    With
    When the first signal and a second signal having a second occupied bandwidth narrower than the first occupied bandwidth are transmitted in the cable, the transmission frequency of the first signal is set to the second signal. A transmission device characterized in that the frequency is lower than the transmission frequency.
  2. 　前記第１信号は、ＩＦ（Ｉｎｔｅｒｍｅｄｉａｔｅ　Ｆｒｅｑｕｅｎｃｙ）信号であることを特徴とする請求項１記載の伝送装置。 The transmission apparatus according to claim 1, wherein the first signal is an IF (Intermediate Frequency) signal.
  3. 　前記第１信号は、ベースバンド信号であることを特徴とする請求項１記載の伝送装置。 The transmission apparatus according to claim 1, wherein the first signal is a baseband signal.
  4. 　前記ベースバンド信号として直交信号を用いることを特徴とする請求項３記載の伝送装置。 4. The transmission apparatus according to claim 3, wherein an orthogonal signal is used as the baseband signal.
  5. 　前記ケーブルを複数備え、
    　前記第１信号および前記第２信号は、各々複数の信号によって構成され、
    　前記第１信号を構成する所定の信号と前記第２信号を構成する所定の信号のペアからなる複数の多重信号を前記ケーブルにて各々伝送することを特徴とする請求項１~４のいずれか１項に記載の伝送装置。     A plurality of the cables,
    Each of the first signal and the second signal includes a plurality of signals,
    5. A plurality of multiplexed signals each consisting of a pair of a predetermined signal that constitutes the first signal and a predetermined signal that constitutes the second signal are each transmitted by the cable. The transmission apparatus according to item 1.
  6. 　前記ケーブルは、同軸ケーブルであることを特徴とする請求項１~５のいずれか１項に記載の伝送装置。 The transmission apparatus according to any one of claims 1 to 5, wherein the cable is a coaxial cable.
  7. 　ケーブルを介して接続される、第１占有帯域幅をもつ第１信号のベースバンド処理を行う第１処理手段と前記第１信号のＲＦ処理を行う第２処理手段との間の伝送方法であって、
    　前記第１信号と前記第１占有帯域幅よりも狭い第２占有帯域幅をもつ第２信号とを前記ケーブル内を共用して伝送する際、前記第１信号の伝送周波数を、前記第２信号の伝送周波数よりも低い周波数とする
    　ことを特徴とする伝送方法。     A transmission method between a first processing means for performing baseband processing of a first signal having a first occupied bandwidth and a second processing means for performing RF processing of the first signal, connected via a cable. And
    When the first signal and a second signal having a second occupied bandwidth narrower than the first occupied bandwidth are transmitted in the cable, the transmission frequency of the first signal is set to the second signal. A transmission method characterized in that the frequency is lower than the transmission frequency.
  8. 　第１占有帯域幅をもつ第１信号のベースバンド処理を行う第１処理回路が実装される本体部と、
    　前記第１信号のＲＦ処理を行う第２処理回路が実装される表示部と、
    　前記第１処理回路と前記第２処理回路とを接続するケーブルと、
    　を備え、
    　前記第１信号と前記第１占有帯域幅よりも狭い第２占有帯域幅をもつ第２信号とを前記ケーブル内を共用して伝送する際、前記第１信号の伝送周波数を、前記第２信号の伝送周波数よりも低い周波数とする
    　ことを特徴とする端末装置。     A main body on which a first processing circuit for performing baseband processing of a first signal having a first occupied bandwidth is mounted;
    A display unit on which a second processing circuit for performing RF processing of the first signal is mounted;
    A cable connecting the first processing circuit and the second processing circuit;
    With
    When the first signal and a second signal having a second occupied bandwidth narrower than the first occupied bandwidth are transmitted in the cable, the transmission frequency of the first signal is set to the second signal. A terminal device characterized by having a frequency lower than the transmission frequency.
  9. 　第１占有帯域幅をもつ第１信号のベースバンド処理を行う第１処理回路と、前記第１信号のＲＦ処理を行う第２処理回路とを含む無線回路を、端末装置へ実装する実装方法であって、
    　前記第１処理回路を、前記端末装置の本体部に実装し、
    　前記第２処理回路を、前記端末装置の表示部に実装し、
    　前記第１処理回路と前記第２処理回路とをケーブルにより接続し、
    　前記第１信号と前記第１占有帯域幅よりも狭い第２占有帯域幅をもつ第２信号とを前記ケーブル内を共用して伝送する際、前記第１信号の伝送周波数を、前記第２信号の伝送周波数よりも低い周波数とする
    　ことを特徴とする実装方法。     A mounting method for mounting a wireless circuit including a first processing circuit that performs baseband processing of a first signal having a first occupied bandwidth and a second processing circuit that performs RF processing of the first signal on a terminal device. There,
    The first processing circuit is mounted on the main body of the terminal device,
    The second processing circuit is mounted on the display unit of the terminal device,
    Connecting the first processing circuit and the second processing circuit by a cable;
    When the first signal and a second signal having a second occupied bandwidth narrower than the first occupied bandwidth are transmitted in the cable, the transmission frequency of the first signal is set to the second signal. A mounting method characterized in that the frequency is lower than the transmission frequency.
  10. 　前記第２処理回路に接続し、第１信号のＲＦ信号を送信または受信する第１アンテナと、
    　前記第２処理回路に接続し、第２信号のＲＦ信号を送信または受信する第２アンテナと、
    　をさらに備え、
    　前記第１アンテナおよび前記第２アンテナを、前記表示部に実装することを特徴とする請求項９記載の実装方法。     A first antenna connected to the second processing circuit for transmitting or receiving an RF signal of the first signal;
    A second antenna connected to the second processing circuit for transmitting or receiving an RF signal of a second signal;
    Further comprising
    The mounting method according to claim 9, wherein the first antenna and the second antenna are mounted on the display unit.
PCT/JP2011/069966 2010-09-01 2011-08-26 Transmission device, transmission method, terminal device, and mounting method WO2012029932A1 (en)

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JP2021523646A (en) * 2018-05-18 2021-09-02 ナンヤン テクノロジカル ユニヴァーシティー Devices and methods for wireless communication
JP7178427B2 (en) 2018-05-18 2022-11-25 ナンヤン テクノロジカル ユニヴァーシティー Apparatus and method for wireless communication

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