JP4133491B2 - Frequency converter - Google Patents

Frequency converter Download PDF

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Publication number
JP4133491B2
JP4133491B2 JP2003081857A JP2003081857A JP4133491B2 JP 4133491 B2 JP4133491 B2 JP 4133491B2 JP 2003081857 A JP2003081857 A JP 2003081857A JP 2003081857 A JP2003081857 A JP 2003081857A JP 4133491 B2 JP4133491 B2 JP 4133491B2
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Japan
Prior art keywords
wired
frequency
unit
signal
wireless
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JP2004289713A (en
Inventor
光容 毛笠
知多佳 真鍋
吉人 福本
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株式会社神戸製鋼所
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a frequency converter that performs mutual conversion between a wireless high frequency and a wired intermediate frequency used in wireless communication, and relates to a frequency converter that has a simple configuration while preventing interference between transmission and reception signals.
[0002]
[Prior art]
In recent years, with the rapid spread of the Internet, there is a high need for a wireless communication system that can realize a high-speed communication environment without laying work such as coaxial cables and optical fibers.
As such a wireless communication system, a bidirectional wireless communication system that performs high-speed wireless communication between a base station (master station) and a subscriber station (slave station) using microwaves to millimeter waves of 10 GHz or higher. Has been developed. In this bidirectional wireless communication system, a modem that modulates and demodulates communication signals and a wireless device that includes a frequency converter are used.
The conventional frequency converter transmits a high frequency received from a communication partner to an intermediate frequency (usually about several hundred MHz to 3 GHz) for input to the modem, and is transmitted from the modem to the communication partner. Two frequency converters (frequency conversion devices) including an up-converter that converts the frequency to a high frequency to wirelessly transmit the intermediate frequency are provided. The configuration of such a radio device is shown in Patent Document 1 and Patent Document 2, for example.
Here, the radio apparatus disclosed in Patent Document 1 and Patent Document 2, although those used for wireless communication of a time division duplex (TDD) scheme, the base even frequency division duplex (FDD) The configuration is the same.
[0003]
FIG. 4 is a block diagram showing a schematic configuration of the conventional radio 2.
A transmission signal (hereinafter referred to as a transmission IF signal) that is an intermediate frequency output from a modulator (modulator) of the modem 3 is frequency-converted to a high frequency by an up-converter A1, and then transmitted through a bandpass filter 15 to a transmission antenna 16. Is transmitted (radiated) as a radio wave.
The up-converter A1 includes an oscillator 11 that outputs a reference oscillation signal, a transmission mixer 12 that performs frequency conversion (conversion to high frequency) of the transmission IF signal from the modem 3 using an oscillation signal from the oscillator 11, and a transmission A band-pass filter 13 that inputs an output signal of the mixer 12 and passes only a radio frequency band (that is, blocks other frequency bands), and a transmission amplifier 14 that amplifies the output signal of the band-pass filter 13; It has. A signal (high frequency) amplified by the transmission amplifier 14 is radiated as a radio wave by the transmission antenna 16.
On the other hand, a high frequency (hereinafter referred to as a received RF signal) transmitted from the communication partner and received by the receiving antenna 26 is input to the down converter A2 via the predetermined bandpass filter 25, and is intermediated by the down converter A2. After frequency conversion to frequency, it is input to the demodulator 32 of the modem 3 (output as viewed from the down converter A2).
The down-converter A2 receives a reception amplifier 24 that amplifies a signal received by the reception antenna 26, a reception mixer 22 that inputs an output signal of the reception amplifier 24, and an output signal of the reception mixer 22, And a band-pass filter 23 that passes only the frequency band of the intermediate frequency to be used (that is, blocks other frequency bands). A signal (intermediate frequency) subjected to frequency discrimination by the band pass filter 23 is input to a demodulator 32 (demodulator) of the modem 3.
Here, the two oscillators 11 and 21 may be integrated into one, and the output thereof may be shared by the divider by dividing by the divider, but the oscillators in that case are individually About twice the output power (+ α: divider loss) is required.
Further, the two antennas 16 and 26 are combined into one, and the connection destination is branched by a circulator or a switch as shown in Patent Document 1 and Patent Document 2, and connected to the up-converter A1 and the down-converter A2, respectively. You may comprise as follows.
[0004]
[Patent Document 1]
JP 2002-12889 A [Patent Document 2]
Japanese Patent Laid-Open No. 11-262054
[Problems to be solved by the invention]
However, the conventional frequency converter in a radio device requires a mixer (frequency mixer) for each of two systems, a transmission up-converter and a reception down-converter, which reduces the size of the device (circuit) and saves power. There was a problem that it was against the cost reduction and cost reduction.
Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to use a mixer (frequency mixer) for transmission (up-conversion) in a frequency conversion device that performs frequency conversion in both directions of transmission and reception. It is to provide a frequency conversion device that can be reduced in size, saved in power, and reduced in cost by being shared by the receiver and the receiver (down-convert).
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention frequency-converts a radio-side received wave, which is a high frequency input from a radio-side input unit, to a wired-side received wave, which is an intermediate frequency, and outputs it to a wired-side output unit. In the frequency conversion device that converts the frequency of the wired transmission wave, which is an intermediate frequency input from the side input unit, into a wireless transmission wave, which is a high frequency, and outputs it to the wireless output unit,
One frequency mixing means for performing both frequency conversion from the wireless side received wave to the wired side received wave and from the wired side transmitted wave to the wireless side transmitted wave;
A reference oscillator for outputting a reference oscillation signal to the frequency mixing means;
Provided between the radio side input unit, the radio side output unit, and the frequency mixing unit, and transmits the radio side reception wave only from the radio side input unit to the frequency mixing unit and transmits the radio side transmission wave. A radio side connection circuit for transmitting only from the frequency mixing means to the radio side output unit;
Provided between the wired-side input unit, the wired-side output unit, and the frequency mixing unit, and transmits the wired-side received wave only from the frequency mixing unit to the wired-side output unit and transmits the wired-side transmitted wave. A wired side connection circuit for transmitting only from the wired side input unit to the frequency mixing means;
Signal detection means for detecting the occurrence of the wired transmission wave in the wired input unit,
The communication system using the frequency converter is a time division duplex (TDD) system,
The wireless side connection circuit switches the connection destination with the frequency mixing unit to the wireless side output unit when the signal detection unit detects the occurrence of the wired side transmission wave, and in other cases, the frequency mixing unit A first switch for switching a connection destination with the means to the wireless side input unit;
The wired side connection circuit switches the connection destination with the frequency mixing unit to the wired side input unit when the signal detection unit detects the occurrence of the wired side transmission wave, and in other cases the frequency mixing unit A frequency conversion device comprising a second switch that switches the connection destination to the means to the wired side output unit is provided .
As a result, the wireless reception wave wraps around the wireless side output unit and becomes noise of the wireless transmission wave wirelessly transmitted to the communication partner, and the wired side transmission wave wraps around the wired side output unit. Thus, it is possible to share one frequency mixing means (that is, the mixer and the reference oscillator) in both directions of transmission and reception while preventing noise from the reception wave on the wired side.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments and examples of the present invention will be described with reference to the accompanying drawings so that the present invention can be understood. It should be noted that the following embodiments and examples are examples embodying the present invention, and do not limit the technical scope of the present invention.
FIG. 1 is a block diagram showing a schematic configuration of a radio equipped with a frequency converter X according to an embodiment of the present invention, and FIG. 2 is an SN of a received signal in the frequency converter according to the embodiment of the present invention. FIG. 3 is a block diagram showing a schematic configuration of a radio equipped with a frequency conversion device X1 according to an embodiment of the present invention, and FIG. 4 is a schematic configuration of a radio equipped with a conventional frequency conversion device. It is a block diagram showing.
[0008]
Hereinafter, a frequency converter X (hereinafter referred to as a converter X) according to an embodiment of the present invention will be described with reference to the block diagram of FIG.
The wireless device 1 including the converter X is used for frequency division duplex (FDD) wireless communication, and transmits / receives radio waves to a modem 3 that performs modulation / demodulation of transmission / reception data, the converter X, and a transmission partner ( A transmitting antenna 16 that radiates), a receiving antenna 26 that receives radio waves from a transmission partner, and predetermined bandpass filters 15 and 16.
A transmission signal that is an intermediate frequency output from the modulator (modulator) of the modem 3 (hereinafter referred to as a transmission IF signal, an example of the wired transmission wave) is input from the wired input unit 41 to the converter X. After being converted to a high frequency by X, it is output from the radio side output unit 42 and transmitted (radiated) as a radio wave from the transmitting antenna 16 via the band pass filter 15. Hereinafter, the transmission signal after the frequency conversion (up-conversion) is referred to as a transmission RF signal (an example of the radio side transmission wave).
A high frequency signal transmitted from the communication partner and received by the receiving antenna 26 (hereinafter referred to as a received RF signal, an example of the radio side received wave) is transmitted via the predetermined band pass filter 25 to the radio side input unit 43. Is input to the converter X, converted to an intermediate frequency by the converter X, output from the wired output unit 44, and input to the demodulator 32 of the modem 3. The received signal after the frequency conversion (down-conversion) is hereinafter referred to as a reception IF signal (an example of the wired reception wave).
[0009]
The converter X includes one mixer 52 that performs both frequency conversion from the received RF signal to the received IF signal and from the transmitted IF signal to the transmitted RF signal, and a reference oscillator 51 that outputs a reference oscillation signal to the mixer 52. A diplexer 53 (hereinafter referred to as an RF diplexer, which is an example of the radio side connection circuit) provided between the radio side input unit 43, the radio side output unit 42, and the mixer 52; and the wired side input unit 41, a diplexer 54 provided between the wired side output unit 44 and the mixer 52 (hereinafter referred to as an example of the wired side connection circuit, referred to as an IF diplexer), a transmission amplifier 14 for amplifying the transmission RF signal, And a receiving amplifier 24 for amplifying the received RF signal. Here, the mixer 52 and the reference oscillator 51 are an example of the frequency mixing means.
The RF diplexer 53 (an example of the first diplexer) passes the received RF signal (frequency band thereof) between the radio side input unit 43 and the mixer 52 and transmits the transmission RF signal A first bandpass filter 53b that cuts off the frequency band), a transmission RF signal that passes between the wireless-side output unit 42 and the mixer 52, and a block that intercepts the received RF signal (frequency region). 2 band-pass filter 53a.
Thus, the reception RF signal received by the reception antenna 26 is prevented from wrapping around to the wireless output unit 42 and becoming noise of the transmission RF signal wirelessly transmitted to the communication partner.
Similarly, the IF diplexer 54 (an example of the second diplexer) passes the transmission IF signal (frequency band thereof) between the wired-side input unit 41 and the mixer 52 and the received IF signal ( Frequency band), the received IF signal (frequency band thereof) is passed between the wired side output unit 44 and the circumference of the mixer 52, and the transmission IF signal (frequency thereof) is blocked. And a fourth band-pass filter 54b for cutting off the band.
This prevents the transmission IF signal output from the modulator of the modem 3 from entering the demodulator of the modem 3 and becoming noise of the reception IF signal received by the modem 3.
[0010]
FIG. 2 shows a case (b) in which the IF diplexer 54 is provided (for the present converter X) and a case in which the IF diplexer 54 is directly connected (the wired side input unit 41, the wired side output unit 44, and the mixer 52 are directly connected). (A) schematically shows the signal level (transmission signal and reception signal level) and noise level (noise floor level) of the signal input to the demodulator of the modem 3 in FIG. The horizontal axis represents frequency.
As shown in FIG. 2A, when the IF diplexer 54 is not provided, the transmission signal (the transmission IF signal) is transmitted to the reception signal due to the influence of the transmission signal (the transmission IF signal) wrapping around to the demodulator side (wired side output unit) of the modem 3. The signal is superimposed to increase the noise floor of the received signal (the received IF signal), and the SN ratio (SNR) of the received signal is deteriorated. As a result, communication quality deteriorates.
On the other hand, as shown in FIG. 2B, when the IF diplexer 54 is provided (the present invention), the signal is isolated by the IF diplexer 54, and the S / N ratio inherent in the received signal can be maintained. .
The same applies to the presence or absence of the RF diplexer 53. By providing the RF diplexer 53, the S / N ratio of the reception signal (transmission signal as viewed from the wireless device 1) on the communication partner side is maintained without deteriorating. can do.
In addition, since only one mixer and one reference oscillator occupying most of the space, power consumption, and cost of the apparatus are required (the output power of the reference oscillator is only one mixer), even if the diplexers 53 and 54 are provided. As a result, it is possible to reduce the size, power consumption, and cost of the device.
[0011]
【Example】
Said converter X (frequency converter) is were those used for wireless communication of FDD scheme, a time division duplex (TDD) frequency which is an embodiment used for wireless communication systems converter X1 (hereinafter, converter wireless device 1 comprising X1 as) 'also contemplated et al are.
FIG. 3 is a block diagram illustrating a schematic configuration of the radio 1 ′ including the converter X1.
The radio 1 ′ is obtained by replacing the converter X in the radio 1 with a converter X1.
Further, the converter X1 replaces the RF diplexer 53 and the IF diplexer 54 in the converter X with first and second switches 53 ′ and 54 ′ (hereinafter referred to as RF switch 53 ′ and IF switch 54 ′), respectively. Further, a signal detection means 61 for detecting the generation (power level) of the transmission IF signal is provided between the IF switch 54 ′ and the wired side input unit 41, and the detection result of the signal detection means 61 A switching circuit 62 for switching both the switches 53 ′ and 54 ′ is provided based on this, and the rest of the configuration is the same as that of the converter X.
Here, when the signal detection means 61 detects the generation of the transmission IF signal, the switching circuit 62 connects both switches 53 ′ and 54 ′ to the transmission side (wireless side output unit 42 and wired side input unit 41). Switch to the reception side (on the wireless side input unit 43 and the wired side output unit 44 side) in other cases.
Accordingly, the connection destination (wired side input unit) of the mixer 52 according to the signal transmission direction (transmission from the wireless device 1 ′ to the communication partner / transmission from the communication partner to the wireless device 1 ′) in TDD communication. 41, connection to the wireless side output unit 42, or connection to the wired side output unit 44 and the wireless side input unit 43) is switched, and the reception signal and the transmission signal are isolated. As a result, it is possible to prevent the transmission IF signal from sneaking to the demodulator side (wired side output unit) of the modem 3 and the reception RF signal from sneaking to the wireless side output unit 42. The ratio can be maintained.
Here, if a signal delay circuit for delaying signal transmission for a predetermined time is provided between the signal detection means 61 and the IF switch 54 ', the switching completion of the IF switch 54' is delayed from the arrival of the transmission IF signal. Can be surely prevented.
Further, the connection switching of both the switches 53 ′ and 54 ′ may be configured to be switched by a control signal from an external device, such as being controlled by the modem 3 controlling the transmission timing.
Also, the two antennas 16 and 26 are combined into one, and the connection destination is branched by a circulator or a switch as shown in Patent Document 1 and Patent Document 2, and the wireless side output unit 42 and the wireless side input unit 43 are branched. You may comprise so that it may connect with each.
Even in such an embodiment, only one mixer and one reference oscillator occupying a large amount of device space, power consumption and cost are required (the output power of the reference oscillator is only one mixer), so that the switch 53 ′, Even if 54 'or the like is provided, the apparatus can be reduced in size, power consumption, and cost can be reduced as compared with the conventional apparatus.
[0012]
【The invention's effect】
As described above, according to the present invention, in a frequency conversion device that performs frequency conversion in both directions of transmission and reception, a mixer (frequency mixer) is provided for transmission (up-conversion) by providing a connection circuit such as a diplexer or a switch. By sharing the signal for reception (down-conversion), it is possible to reduce the size of the device, save power, and reduce the cost while maintaining the S / N ratio of the transmission / reception signal.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a schematic configuration of a wireless device including a frequency conversion device X according to an embodiment of the present invention.
FIG. 2 is a schematic diagram for explaining an S / N ratio of a received signal in the frequency conversion device according to the embodiment of the present invention.
FIG. 3 is a block diagram illustrating a schematic configuration of a wireless device including a frequency conversion device X1 according to an embodiment of the present invention.
FIG. 4 is a block diagram illustrating a schematic configuration of a wireless device including a conventional frequency conversion device.
[Explanation of symbols]
1, 1 '... wireless device (present invention)
2 ... conventional radio 3 ... modem 11, 21, 51 ... reference oscillator 12, 22, 51 ... mixer 14 ... transmitting amplifier 16 ... transmitting antenna 24 ... receiving amplifier 26 ... receiving antenna 53 ... RF diplexer (radio side connection circuit, First diplexer)
53 '... RF switch (wireless side connection circuit, first switch)
54 ... IF diplexer (wired side connection circuit, second diplexer)
54 '... IF switch (wired side connection circuit, second switch)

Claims (1)

  1. It is an intermediate frequency that is input from the wired side input unit and is converted to a wired side received wave that is an intermediate frequency and output to the wired side output unit after being converted to a wired side received wave that is a high frequency input from the wireless side input unit In a frequency converter that converts the frequency of a wired transmission wave to a wireless transmission wave, which is a high frequency, and outputs it to a wireless output unit,
    One frequency mixing means for performing both frequency conversion from the wireless side received wave to the wired side received wave and from the wired side transmitted wave to the wireless side transmitted wave;
    A reference oscillator for outputting a reference oscillation signal to the frequency mixing means;
    Provided between the radio side input unit, the radio side output unit, and the frequency mixing unit, and transmits the radio side reception wave only from the radio side input unit to the frequency mixing unit and transmits the radio side transmission wave. A radio side connection circuit for transmitting only from the frequency mixing means to the radio side output unit;
    Provided between the wired-side input unit, the wired-side output unit, and the frequency mixing unit, and transmits the wired-side received wave only from the frequency mixing unit to the wired-side output unit and transmits the wired-side transmitted wave. A wired side connection circuit for transmitting only from the wired side input unit to the frequency mixing means;
    Signal detection means for detecting the occurrence of the wired transmission wave in the wired input unit,
    The communication method using the frequency converter is the time division duplex method.
    The wireless side connection circuit switches the connection destination with the frequency mixing unit to the wireless side output unit when the signal detection unit detects the occurrence of the wired side transmission wave, and in other cases, the frequency mixing unit A first switch for switching a connection destination with the means to the wireless side input unit;
    The wired side connection circuit switches the connection destination with the frequency mixing unit to the wired side input unit when the signal detection unit detects the occurrence of the wired side transmission wave, and in other cases the frequency mixing unit A frequency converter comprising a second switch for switching a connection destination with the means to the wired side output unit .
JP2003081857A 2003-03-25 2003-03-25 Frequency converter Expired - Fee Related JP4133491B2 (en)

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JP4133491B2 true JP4133491B2 (en) 2008-08-13

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US9641020B2 (en) 2015-03-25 2017-05-02 South University Of Science And Technology Of China Receiver
CN204559552U (en) * 2015-03-25 2015-08-12 南方科技大学 A kind of receiver

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