WO2003084083A1

WO2003084083A1 - Transmitter, receiver, and wireless communication device comprising transmitter and receiver

Info

Publication number: WO2003084083A1
Application number: PCT/JP2003/003882
Authority: WO
Inventors: Shigetaka Noguchi
Original assignee: Sharp Kabushiki Kaisha
Priority date: 2002-03-28
Filing date: 2003-03-27
Publication date: 2003-10-09
Also published as: AU2003236164A1

Abstract

The generation frequency band of a first IF signal generated by a digital signal modulator (11a) frequency band of a transmission signal, is adjusted depending on the so that the generation frequency band is compatible with the upper frequency edge of a first IF band-pass filter (14). In addition, the oscillation frequency of a first local oscillator (24a) is adjusted so that a second IF signal, generated by converting the first IF signal by a first frequency converter (23a), compatible with the lower frequency edge of a second IF band-pass filter (25). This allows the transmission signal, including a plurality of frequency bands, to be transmitted with no additional filter and without providing a switch for the filter.

Description

Specification

Transmitting device, receiving device, and wireless communication device including them

Technical field

The present invention relates to a transmitting device that modulates an input signal into a high-frequency signal and transmits a high-frequency signal in a desired frequency band, receives a high-frequency signal in a plurality of frequency bands, and outputs an intermediate frequency signal in a desired frequency band The present invention relates to a receiving device that demodulates the signal and a wireless communication device including the receiving device.

Background art

In recent years, several unlicensed low-power wireless communication systems using the 5 GHz band have been proposed and standardized, and have actually used the IEEE 802.11a and the ARIB (Radio Industry Association) Hi-SWAN standard. Wireless communication systems have been developed. However, the 5 GHz band has only four channels with a frequency band of 20 MHz (the occupied signal frequency band is 18 MHz), and if many wireless communication terminals or multiple communication systems exist in the same area, However, there is a high possibility that the throughput will decrease due to interference. In addition, basically only one communication channel is used, and it is not assumed that a large number of channels will be bundled at the same time for large-capacity communication. In order to solve these problems, low-power wireless communication systems using the quasi-millimeter wave band of the 25 GHz band and the 27 GHz band have recently been approved under the Radio Law and standardization has been promoted. ing. For example, outdoors in a hot spot such as a train station or a coffee shop—a personal area system designed for Internet access has a frequency of 460 MHz from 24.77 GHz to 25.23 GHz (excluding upper and lower 20 MHz guard bands). 23 radio channels can be allocated at a frequency interval of 20 MHz (the occupied signal frequency band per channel is 18 MHz), and 3 channels can be allocated. Simultaneous transmission below the channel is possible. In addition, it is assumed that wireless LAN and wireless home link are used in a home factory using 27.02 GHz to 27.46 GHz (excluding upper and lower 20 MHz guard bands). In the community area, 22 radio channels can be arranged at a frequency of 20 MHz, and simultaneous transmission of 6 channels or less is possible.

In such a communication system in which simultaneous transmission of a plurality of channels is permitted, the frequency band of the radio signal is not constant. This means that filters used in transmitters, especially filters that require steep attenuation characteristics to prevent the transmission of interfering waves to adjacent channels (such as SAW filters), are used in the frequency band of radio signals. It is necessary to change the characteristics of the filter according to the conditions. For example, if there are three types of radio signal frequency bands, at least three types of filters having different pass frequency bands are required in the IF frequency band and the baseband frequency band.

As an example of such a transmission device provided with a filter corresponding to the frequency band of a radio signal, a transmission device shown in FIG. 7 is considered.

The transmitting device in FIG. 7 includes a signal modulating unit 10 c, a first IF transmitting unit 12 0, a second IF transmitting unit 13 30, an RF transmitting unit 40, a transmitting / receiving antenna 50, and a control unit 17. It consists of 0a.

The digital signal modulator 11c provided with transmission signal generation means generates a first IF signal based on information on the frequency band of the transmission signal transmitted by the control unit 170a. The first IF signal removes unnecessary harmonic components such as a second harmonic and a third harmonic by a digital filter 12c, and is converted from a digital signal to an analog signal by a DZA converter 13c. You.

Here, the digital filter 12 c switches the characteristics of the filter according to the frequency band of the signal, and the increase in the number of components and the development / manufacturing cost as the characteristics of the digital circuit is smaller than that of the analog filter. However, it is impossible to remove all unnecessary high-frequency components due to sampling frequency and other factors. Therefore, at a later stage An analog filter is required.

Next, the signal path of the analogized first IF signal is switched according to the frequency band by the operation of the first IF signal switch 127 a, and the first IF signal path filter (1 2 1 — Pass through one of the filters from 1 to 1 2 2— n). After passing therethrough, the first IF signal, via a first IF signal switch 127b, is a signal suitable for the input of a first frequency converter 123, in a first IF transmitting amplifier 122. It is amplified to power.

In the first frequency converter 123, the first IF signal is up-converted into a second IF signal by a local signal (frequency is fixed) input from the first local oscillator 124. . The signal path of the second IF signal is switched according to the frequency band by the action of the second IF signal switch 128a, and the second IF signal path filter (1 291—1 to 1 2 Pass through one of the 9-n) phil evenings. After that, the second IF signal is passed through a second IF signal switch 128b to a second IF transmission amplifier 132 having a transmission power control function, and a second frequency converter. It is amplified to the signal power suitable for the input of 133.

Next, the second frequency converter 1333 inputs the oral signal generated from the second local oscillator 1334, thereby up-converting the second IF signal into an RF signal. Here, the control unit 170a controls the generation frequency of the roll signal generated by the second local oscillator 1334, and adjusts the frequency band of the RF signal to a desired transmission channel.

Next, the RF signal passes through a wide-band RF bandpass filter 135 that passes a signal frequency band of all channels for the purpose of removing the transmission spurious generated by the second frequency converter 133. Thereafter, the RF signal is amplified to a predetermined transmission power by the RF power amplifier 42, and is radiated into the air from the transmission / reception antenna 50 via the transmission / reception switch 43 and the RF bandpass filter 44.

However, the transmitting device of FIG. 7 described in the section of the prior art does not Filters having different characteristics are required depending on the number of bands. In other words, a communication system with three frequency bands (3 channel specification) requires at least three filters with different characteristics, and a communication system with 6 frequency bands (6 channel specification) requires at least 6 filters. Filters with different characteristics are required.

In addition, in order to perform switching between multiple filters, a switch circuit must be at least 2 in order to perform stable impedance matching between the leakage of the transmission signal to other signal paths and the circuits connected before and after. You need them. In the configuration of Fig. 7, the number of switches and the number of filters are doubled because the transmission signal is up-converted in two stages. With the 6-channel specification, at least 12 filters (two sets of filters with six different characteristics) and four switch circuits are required to transmit signals in multiple frequency bands.

This requires extra filters and switch circuits, which not only increases the manufacturing cost, but also has the disadvantage of increasing the mounting area when the transmitter is mounted on a small portable device. In addition, developing filters with different characteristics not only increases the development cost, but also makes it difficult to provide uniform attenuation characteristics between different types of filters. There is also a problem that it may vary.

Accordingly, an object of the present invention is to increase the number of filters for eliminating unnecessary radiation such as spurious signals in a transmission signal, particularly for the purpose of transmitting signals in a plurality of frequency bands, in view of the above-described problems. It is an object of the present invention to provide a transmitting device capable of transmitting radio signals in a plurality of frequency bands and a radio communication device using the same without providing a switch circuit for switching the filter. is there.

Further, as an example of a receiving device provided with a filter according to the frequency band of a radio signal, a receiving device shown in FIG. 14 is considered.

The receiving device shown in Fig. 14 includes a transmitting / receiving antenna 60, an RF receiving unit 70, a first IF converting unit 150, a second IF converting unit 160, a signal demodulating unit 100c, and a control unit. Part 1 7 0 b It is composed of The RF reception signal input from the transmission / reception antenna 60 is amplified by the RF reception amplifier 74 via the transmission / reception switch 72 after passing through the broadband RF bandpass filter 71 that passes the signal frequency band of all channels. . Next, a local signal generated from the first local oscillator 154 is input to the first frequency converter (mixer) 151, whereby the signal is down-converted into a first IF reception signal. Here, the control unit 17 Ob analyzes the preamble signal or the like received in advance, detects the frequency band of the received signal, and always sets the center frequency of the received signal to the center frequency of the first IF frequency band ( For example, the oscillation frequency of the local oscillator 154 is controlled so as to be fixed at 2400 ± 10 MHz and 2400 ± 20 MHz).

The signal path of the first IF reception signal is switched according to the frequency band by the operation of the first IF signal switch 158, and any one of the first IF bandpass filters 152-1 to 152-n is output. Pass the two first IF bandpass filters. After passing through, the first IF received signal passes through the first IF signal switch 159 and is input to the first IF frequency amplifier 153 having an automatic gain control function, and the signal strength suitable for the input of the subsequent circuit Is amplified. The control unit 17 Ob controls the first IF signal switches 158 and 159 similarly to the local oscillator 154, and also controls the switching of the first IF bandpass filter.

The first IF received signal is down-converted to a second IF received signal in a frequency converter 161 by a local signal (frequency is fixed) input from a second local oscillator 164. The signal path of the second IF reception signal is switched according to the frequency band by the action of the second IF signal switch 168, and the second IF band-pass filter (162-1 to 162-n) Pass one of the Phil evenings. After the passage, the second IF reception signal is input to the second IF frequency amplifier 163 via the second IF signal switch 169 and adjusted to a signal strength suitable for the input of the AZD converter 101c. . Second IF signal switch 168, 169 The signal switching is controlled according to the frequency band of the received signal recognized in advance by the control unit 170b in the manner described above.

The second IF reception signal is converted from an analog signal to a digital signal by the AZD converter 101c, and the digital reception filter 102c further removes noise components and the like to perform IF frequency sampling. The received signal is demodulated by the signal demodulator 103c.

However, as described above, the receiving apparatus of FIG. 14 needs filters having different characteristics according to the number of frequency bands of the received signal. In other words, a communication system with three frequency bands (3 channel specification) requires three filters with different characteristics, and a communication system with 6 frequency bands (6 channel specification) requires at least 6 filters. You need different characteristics of Phil.

In addition, in order to switch between multiple filters, the switch circuit must be at least 2 in order to perform stable impedance matching between the leakage of the received signal to other signal paths and the circuits connected before and after. You need them. In the configuration of Fig. 14, the RF reception signal is down-converted in two stages, so that the number of switches and the number of filters are doubled. With the 6-channel specification, at least 12 filters (two sets of filters with six different characteristics) and four switch circuits are required to demodulate received signals in multiple frequency bands.

This requires extra filters and switch circuits, which not only increases the manufacturing cost, but also has the disadvantage of increasing the mounting area when the receiver is mounted on a small portable device. Furthermore, developing filters with different characteristics increases the development cost, and it is difficult to obtain uniform attenuation characteristics between different types of filters, and there is also a problem that the demodulation performance varies depending on the frequency band of the received signal. I do.

Therefore, in view of the above problems, an object of the present invention is to provide a filter for removing an adjacent wave or noise of a received signal, particularly for receiving a signal in a plurality of frequency bands. To provide a receiving device capable of demodulating wireless signals in a plurality of frequency bands without increasing the number of switches and without providing a switch circuit for switching the filter, and a wireless communication device including the same. It is in.

Disclosure of the invention

In order to solve the above problems, a first invention is directed to a modulation unit that modulates an input signal into a first intermediate frequency signal in a predetermined frequency band, and an IF conversion unit that converts the first intermediate frequency signal into a high frequency signal A transmission device comprising: an RF transmission unit that transmits the high-frequency signal; and a control unit that controls each unit, wherein the modulation unit modulates the first intermediate frequency signal. The first IF filter that allows the first intermediate frequency signal to pass therethrough, wherein the control unit is configured to control a frequency of the first intermediate frequency signal at the edge of a pass frequency band of the first IF filter. The frequency of the modulation section is adjusted and set so that edges are aligned.

A second invention is the transmission device according to the first invention, wherein the IF conversion unit converts the first intermediate frequency signal modulated by the modulation unit into a second intermediate frequency signal. A first IF conversion unit including: a first frequency conversion unit; a second IF filter that passes the second intermediate frequency signal; and a second IF conversion unit that converts the second intermediate frequency signal into a high frequency signal. And a second IF conversion unit including a second IF conversion unit, wherein the control unit includes an edge of a frequency band of the first intermediate frequency signal at an edge of a pass frequency band of the first IF filter. The frequency of the modulation section is adjusted and set so that the first frequency is adjusted so that the edge of the frequency band of the second intermediate frequency signal is aligned with the edge of the pass frequency band of the second filter. The frequency of the conversion means is adjusted and set.

A third invention is the transmission device according to the first or second invention, wherein the modulation unit comprises: a digital filter for removing unnecessary harmonic components of the intermediate frequency signal; DZA conversion means for converting the passing signal to an analog signal The control unit adjusts and sets the frequency of the modulation unit so that the edge of the frequency band of the first intermediate frequency signal is aligned with the edge of the pass frequency band of the digital filter.

A fourth invention is the transmission device according to the first, second, or third invention, wherein the first IF filter is a band-pass filter or a low-pass filter.

A fifth aspect of the present invention is the transmission device according to the third aspect, wherein the digital filter is a digital filter having a band pass filter or a mouth-to-pass filter function.

A sixth invention is the transmission device according to the second or third invention, wherein the second device is referred to as the second device.

A seventh invention is a modulation section for modulating an input signal into a baseband signal in a predetermined frequency band, an IF conversion section for converting the baseband signal via an intermediate frequency or to a high-frequency signal, and the high-frequency signal And a control unit for controlling each unit, the modulation unit comprising: a signal modulation unit configured to modulate the baseband signal; and a signal modulation unit configured to transmit the baseband signal. And a control unit that adjusts and sets the frequency of the modulation unit so that the edge of the frequency band of the baseband signal is aligned with the edge of the passband of the baseband filter. And

An eighth invention is the transmission device according to the seventh invention, wherein the IF conversion unit is a first frequency conversion unit that converts the baseband signal modulated by the modulation unit into an intermediate frequency signal. A first IF converter provided with an IF filter for passing the intermediate frequency signal, and a second IF converter provided with second frequency converting means for converting the intermediate frequency signal into a high frequency signal. The control unit aligns the edge of the frequency band of the baseband signal with the edge of the passband of the baseband filter. The frequency of the first frequency conversion means is adjusted and set so that the edge of the frequency band of the intermediate frequency signal is aligned with the edge of the pass frequency band of the IF filter. It is characterized by doing.

A ninth invention is the transmission device according to the seventh or eighth invention, wherein the modulation unit comprises: a digital filter for removing unnecessary harmonic components of the baseband signal; and the digital filter. DZA conversion means for converting an evening pass signal into an analog signal, wherein the control unit is configured to adjust the edge of the passband of the digital filter to the edge of the frequency band of the baseband signal. It is characterized in that the frequency is adjusted and set.

A tenth invention is the transmission device according to the seventh, eighth, or ninth invention, wherein the baseband filter is a mouth-to-pass filter.

An eleventh invention is the transmission device according to the ninth invention, wherein the digital filter is a digital filter having a low-pass filter function.

A twelfth invention is the transmission device according to the seventh or eighth invention, wherein the IF device.

A thirteenth invention is a wireless communication device comprising the transmission device according to any one of the first to twelve inventions.

In the present invention, the frequency of the local signal of the signal modulation means and the frequency conversion means is adjusted and set so that the edges of the frequency band of the intermediate frequency signal and the baseband signal are aligned with the edges of the pass frequency band of the filter. It is not necessary to prepare filters having different passbands for each channel as in the conventional case. This is because the noise component can be removed by moving the frequency band of the intermediate frequency signal to pass through a filter having a predetermined pass frequency band.

For example, when modulating the input signal with the modulator, the modulation signal of the first intermediate frequency band is The upper limit frequency is aligned with the upper edge of the first IF filter, and the pass frequency band of the digital filter is adjusted according to the frequency band of the modulated signal. The first filter removes a harmonic noise component such as a second harmonic and a third harmonic that cannot be removed by the digital filter generated in a signal modulation process. Further, by adjusting the conversion frequency of the frequency conversion circuit breaker, the lower limit frequency of the transmission signal of the second IF frequency band is aligned with the lower edge of the second filter, and Noise such as image components existing in the frequency band on the side is removed.

Further, when modulating the input signal by the signal modulating means, the upper limit frequency of the modulation signal in a baseband frequency band is set to be equal to the edge of the base spanned filter, and according to the frequency band of the modulation signal. Adjust the passband of the digital filter. In the baseband filter, harmonic noise components such as 2nd and 3rd harmonics that cannot be completely eliminated during the signal modulation process are removed.

Further, by adjusting the conversion frequency of the frequency conversion means, the lower edge of the transmission signal of the second intermediate frequency band is aligned with the lower edge of the IF filter, and the lower side of the transmission signal is adjusted. Eliminates noise such as image components existing in the frequency band. Thereby, the above-mentioned problem is solved.

As described above, as a means for solving the problem of the present invention, a method of cutting a noise component by using each filter has been described. However, even without a digital filter, the problem can be solved. Also, there is no problem even if there are a plurality of first IF conversion units, and it is sufficient that the first IF conversion unit is only necessary for removing noise of the intermediate frequency signal.

Also, a fourteenth aspect of the present invention provides an RF receiving unit that receives a high-frequency signal, an IF conversion unit that converts the high-frequency signal into an intermediate frequency signal, a demodulation unit that demodulates the intermediate frequency signal, and a control unit that controls each unit. A IF conversion unit, the IF conversion unit comprising: a frequency conversion unit configured to convert a high-frequency signal received by the RF reception unit into an intermediate frequency signal; and And a filter that passes a signal in a frequency band. The frequency of the local signal of the frequency conversion means is adjusted and set so that the edges of the frequency band of the intermediate frequency signal are aligned.

A fifteenth invention is the receiving device according to the fifteenth invention, further comprising: a detection unit configured to detect a frequency band of a received signal from a received harmonic signal, wherein the control unit is configured to receive the received signal. The frequency of the local signal of the frequency conversion means is adjusted and set based on the above frequency band.

A sixteenth invention is the receiving device according to the fifteenth invention, wherein the demodulation section demodulates a control signal of a specific frequency band including the information of the frequency band, Detecting a frequency band of the received signal based on the demodulated control signal.

A seventeenth invention is the receiving device according to the fifteenth, fifteenth, or sixteenth invention, wherein the IF conversion unit includes a first frequency conversion unit and a first filter. A first IF converter, a second IF converter having a second frequency converter and a second filter, wherein the frequency setting means includes an upper limit or a lower limit of a pass band of the first filter. Sets the frequency of the local signal of the first frequency conversion means so that the upper or lower edge of the frequency band of the intermediate frequency signal is aligned with the lower edge, and the lower or upper limit of the pass band of the second filter. The frequency of the local signal of the second frequency conversion means is set so that the lower or upper edge of the frequency band of the intermediate frequency signal is aligned with the edge of the second frequency converter.

An eighteenth invention is the receiving device according to the seventeenth invention, wherein the first filter is a band-pass filter or a one-pass filter. A nineteenth invention is a receiving device according to the seventeenth invention, wherein the second filter is a wireless communication device including the receiving device. In the invention, the intermediate frequency signal is provided at an edge of a pass frequency band of the filter. Since the frequency of the oral signal of the frequency conversion means is adjusted and set so that the edges of the frequency band are aligned, it is not necessary to prepare filters having different pass frequency bands for each channel as in the related art. This is because the noise component can be removed by moving the frequency band of the intermediate frequency signal to pass through the filter having a predetermined pass frequency band.

For example, a first IF conversion unit and a second IF conversion unit are provided, and the control unit adjusts the conversion frequency of the first frequency conversion unit of the first IF conversion unit, thereby providing a first filter. The upper edge of the received signal in the first IF frequency band is aligned with the upper limit frequency to remove noise components existing in the upper frequency band of the received signal such as the upper adjacent wave and the spurious. Further, by adjusting the conversion frequency of the second frequency conversion means of the second IF conversion section, the lower edge of the second filter is provided with a second IF frequency band or a single band frequency band. The noise components existing in the lower frequency band of the received signal, such as the lower adjacent wave, are removed by aligning the upper limit frequencies of the received signals of the received signals. Thus, radio signals in a plurality of frequency bands can be demodulated without providing a filter for each channel or providing a switch circuit for switching the filter as in the related art. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a block diagram showing a configuration example of the transmitting apparatus according to the first embodiment of the present invention.

FIG. 2 is a diagram showing an example of a flowchart relating to the transmission method of the transmission device according to the first embodiment and the second embodiment of the present invention.

FIG. 3 is a diagram showing an example of a frequency characteristic of a transmission signal on the frequency axis according to the first embodiment and the second embodiment of the present invention.

FIG. 4 is a diagram showing an example of a correlation between a filter and a transmission signal on the frequency axis according to the first embodiment of the present invention. FIG. 5 is a block diagram illustrating a configuration example of a transmission device according to the second embodiment of the present invention.

FIG. 6 is a diagram showing an example of a correlation between a filter and a transmission signal on the frequency axis according to the second embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration example of a conventional transmission device.

FIG. 8 is a block diagram showing a configuration example of a receiving device according to the third embodiment of the present invention.

FIG. 9 is a diagram showing an example of a flowchart relating to the receiving method of the receiving device according to the third embodiment and the fourth embodiment according to the present invention.

FIG. 10 is a diagram showing an example of a received signal frequency characteristic on the frequency axis according to the embodiment of the present invention.

FIG. 11 is a diagram showing an example of a correlation between a received signal and a received signal on the frequency axis according to the third embodiment of the present invention.

FIG. 12 is a block diagram showing a configuration example of a receiving device according to the fourth embodiment of the present invention.

FIG. 13 is a diagram showing an example of a correlation between a received signal and a received signal on the frequency axis according to the fourth embodiment of the present invention.

FIG. 14 is a block diagram showing a configuration example of a conventional receiving apparatus.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described.

FIG. 1 is a block diagram showing a configuration of the transmitting apparatus according to the first embodiment. The transmitting device according to the first embodiment of the present invention includes a signal modulating unit 10 a, a first IF transmitting unit 20 a, a second IF transmitting unit 30, an RF transmitting unit 40, and a transmitting / receiving antenna 5. 0 and the control unit 70a. Configuration of RF Transmitter 40 and Transmit / Receive Antenna 50 The function and the function are the same as those of the example of the transmitting apparatus shown in FIG. 7, but the signal modulating section 10 a, the first IF transmitting section 20 a, the second IF transmitting section 30, and the control section 70 a Is different from the example of the transmitting apparatus shown in FIG.

The digital signal modulator 11a including the transmission signal modulating means generates the first IF signal based on the information on the frequency band of the transmission signal transmitted from the control unit 70a. The first IF signal removes unnecessary harmonic components such as a second harmonic and a third harmonic by a band-pass filter or a digital filter 12 a having a single-pass filter function, and a DZA converter 13 a It is converted from a digital signal to an analog signal. Next, the analogized first IF signal passes through the first IF bandpass filter 14, and is input to the first frequency converter 23 a by the first IF transmission amplifier 22. It is amplified to a suitable signal power.

In the first frequency converter 23a, the first IF signal is up-converted into a second IF signal by a local signal input from the first local oscillator 24a. The up-converted second IF signal passes through a second IF band-pass filter 25 and a second IF transmission amplifier 32 having a transmission power control function, and a second frequency converter 33 Is amplified to a signal power suitable for the input. The second frequency converter 33 up-converts the second IF signal into an RF signal by inputting a local signal generated by the second local oscillator 34.

Next, the RF signal passes through a wide-band RF bandpass filter 35 that passes the signal frequency band of all the channels, which also has a purpose of removing the transmission spurious generated by the second frequency converter 33. Thereafter, the RF signal is amplified to a predetermined transmission power by the RF power amplifier 42, and is radiated into the air from the transmission / reception antenna 50 via the transmission / reception switch 43 and the RF bandpass filter 44. .

The control unit 70a controls the digital signal modulator 11a based on the frequency band of the transmission signal so that the upper limit of the frequency band of the transmission signal comes to the upper edge of the first IF bandpass filter 14. Adjust the frequency of the generated transmission signal, and The pass frequency band of the filter 12a is adjusted according to the frequency band of the modulation signal. Further, the control unit 70a controls the first local oscillator based on the frequency band of the transmission signal so that the lower limit of the frequency band of the transmission signal comes to the lower edge of the second IF bandpass filter 25. Adjust the oscillation frequency of 24a. The control unit 70a also controls the entire transmission device, such as adjusting the gain of the transmission / reception switch 43 and the second IF transmission amplifier 32.

FIG. 2 is a flowchart illustrating a transmission method of the transmission device according to the first embodiment of the present invention. FIG. 3 is a graph illustrating an example of a transmission signal frequency characteristic on the frequency axis according to the embodiment of the present invention. FIG. 4 is a diagram showing an example of a correlation between a filter and a transmission signal on the frequency axis according to the first embodiment of the present invention.

Hereinafter, the transmission method of the transmission apparatus according to the present invention will be described mainly with reference to FIG. 2 and also to FIGS. 1, 3, and 4 as appropriate.

In the present embodiment, signals in three frequency bands as shown in (a), (b), and (c) of FIG. 3 are used. (A) in Fig. 3 shows a transmission signal when only one channel is used. The center frequency of the transmission signal is fc, and the frequency band is 2 Af (Δf is the half bandwidth of the frequency band of one channel). It is. (B) of FIG. 3 shows a transmission signal when two channels are used simultaneously. The center frequency of the transmission signal is fc and the frequency band is 4Δf. (C) in Fig. 3 shows a transmission signal when three channels are used simultaneously. The center frequency of the transmission signal is fc, and the frequency band is 6 Af.

First, in step S11 of FIG. 2, the control unit 70a of the transmitting apparatus adjusts the transmission signal generated by the digital signal modulator 11a according to the frequency band occupied by the control signal to be transmitted. It adjusts the frequency band of the first IF signal) and the local oscillation frequency of the first local oscillator 24a. In addition, the center frequency of the control signal including control information for notifying the other party of information necessary for wireless communication such as its own transmission time and the frequency band of the transmission signal is set to the center frequency of the frequency band used for transmission. To fit The local oscillation frequency of the second local oscillator 34 is also adjusted. In step S12, the transmitting device generates a control signal and performs actual transmission.

In step S13, the control unit 70a of the transmitting apparatus transmits the transmission signal (first IF signal) generated by the digital signal modulator 11a based on the frequency band of the data signal to be transmitted by itself. Adjust the frequency band so that the upper limit frequency of the first IF signal comes to the upper edge of the first IF bandpass filter 14 (fc + 2Af for 1-channel signal) I do.

In step S14, the oral oscillation frequency of the first local oscillator 24a is adjusted so that the lower limit frequency of the second IF signal is lower than the lower edge of the second IF bandpass filter 25. (In the case of 1-channel signal, adjust so that it comes to fc−2Δf). In addition, the local oscillation frequency of the second local oscillator 34 is adjusted so that the center frequency of the RF signal obtained by up-converting the second IF signal matches the frequency band of the channel used for transmission.

In step S15, the data signal is actually generated and transmitted. If the transmission process is to be continued, the process returns to step S11. Otherwise, the transmission process is terminated (step S16).

Next, the correlation between the transmission signal and the transmission signal will be described with reference to FIG. FIG. 4 shows a case where the transmission signal has three frequency bands. The first IF band pass filter 14 has a characteristic of a center frequency fc 1 and a pass frequency band 6 Δf, and The bandpass filter 25 has a characteristic of a center frequency fc2 and a pass frequency band of 6 Af. The pass frequency bands of the bandpass filters 14 and 25 are set according to the transmission signal having the maximum frequency band. In other words, the pass frequency band of each band-pass filter is (maximum number of simultaneously transmittable channels X 2 Δf).

(Al) in FIG. 4 is a correlation diagram regarding the first IF signal when one channel is used for the transmission signal, and reference numeral 181-1-1 indicates the frequency characteristic of the first IF signal. Reference numeral 191 indicates the frequency characteristic of the first IF bandpass filter 14. (A 2) of FIG. 4 is a correlation diagram regarding the second IF signal when one channel is used for the transmission signal. Reference numeral 181-2 denotes the frequency characteristic of the second IF signal, and reference numeral 192 denotes the second IF signal. Indicates the frequency characteristic of the second IF bandpass filter 25.

(Bl) in FIG. 4 is a correlation diagram relating to the first IF signal when two channels are used for the transmission signal, and reference numeral 182-1 denotes the frequency characteristic of the first IF transmission signal. (B2) of FIG. 4 is a correlation diagram relating to the second IF signal when two channels are simultaneously used for the transmission signal, and reference numeral 182-2 denotes a frequency characteristic of the second IF signal.

(C1) of FIG. 4 is a correlation diagram regarding the first IF signal when three channels are used simultaneously for the transmission signal, and reference numeral 183_1 indicates the frequency characteristic of the first IF signal. (C 2) in FIG. 4 is a correlation diagram regarding the second IF signal when three channels are simultaneously used for the transmission signal, and reference numeral 183-2 indicates a frequency characteristic of the second IF transmission signal. .

The frequency band of one channel is 20 MHz, and the carrier center frequency (R

F) is 25.00 GHz, the carrier center frequency (fc2) of the second IF signal is 2440 MHz, and the carrier center frequency (fc1) of the first IF signal is 40 MHz. The passing frequency bandwidth of the first IF band-pass filter 14 and the second band-pass filter 25 has characteristics that match the signal frequency bandwidth of the maximum channel (in this case, three channels). In the example of the first embodiment, the pass frequency band of the first IF bandpass filter 14 is 10 MHz to 70 MHz, and the pass frequency band of the second IF bandpass filter 25 is 2410 MHz. From 2470 MHz.

When the transmission signal uses only one channel, the center frequency IF1 of the transmission signal in the first IF frequency band may be obtained by adding 2 △ f to fc1.

IF l = fc l + 2A f = 40 + 2X 10 = 60 (MHz) .. (Equation 1—1)

Becomes

In other words, a transmission signal having a center frequency of 6 OMHz and a frequency band of 2 OMHz may be generated by the signal modulation section 11a (see (a1) in FIG. 4).

Next, in order to up-compress the transmission signal of the first IF frequency band to the second IF frequency band, the center frequency IF2 of the transmission signal of the second IF frequency band is 2 Δ from fc 2. Since we only need to reduce f

I F 2 = f c 2-2 A f = 2440-2X 10 = 2420 (MH z)

• · (Equation 1 2)

Becomes

That is, the local frequency L〇 1 emitted from the first local oscillator 24 a is

LOl = I F 2- I F l = 2420-60 = 2360 (MHz)

• · (Equation 1 1 3)

(See (a2) in Fig. 4).

Further, in order to up-convert the second IF signal into an RF signal having a center frequency of 25 GHz, the oral frequency L〇 2 emitted from the second local oscillator 34 is given by: L02 = RF−IF 2 = 25−2 . 42 = 22. 58 GHz

. (Equation 1-1 4)

Becomes

If the transmission signal uses two channels at the same time, the center frequency IF1 of the transmission signal in the first IF frequency band can be obtained by adding Δf to fc1.

I F l = f c 1 + A f = 40+ 10 = 50 (MHz)

• · (Equation 2—1)

Becomes

That is, a transmission signal having a center frequency of 5 OMHz and a frequency band of 4 OMHz may be generated by the signal modulation section 11a (see (b1) in FIG. 4). Next, in order to up-compress the transmission signal of the first IF frequency band to the second IF frequency band, the center frequency IF2 of the transmission signal of the second IF frequency band is expressed by Δf from fc 2. It is enough to reduce

I F2 = f c 2-A f = 2440-10 = 2430 (MHz)

· (Formula 2-2)

Becomes

That is, the local frequency L〇1 generated by the first local oscillator 24 is

L01 = IF2-IF1 = 2430-50 = 2380 (MHz)

• · (Equation 2-3)

(See (b2) in Fig. 4).

Furthermore, in order to up-convert the second IF signal into an RF signal having a center frequency of 25 GHz, the local frequency L〇2 generated by the second local oscillator 34 is given by: L02 = RF-IF 2 = 25−2.43 = 22.57 GHz

... (Equation 2—4)

Becomes

When the transmission signal uses three channels simultaneously, the center frequency IF1 of the transmission signal in the first IF frequency band may be fc1, so that

I F 2 = f c 2 = 40 (MHz)

• · · (Equation 3-1)

Becomes

In other words, a transmission signal having a center frequency of 40 MHz and a frequency band of 60 MHz may be generated by the signal modulator 11a (see (c1) in FIG. 4).

Next, in order to up-convert the transmission signal of the first IF frequency band to the second IF frequency band, the center frequency IF2 of the transmission signal of the second IF frequency band may remain fc2 as it is. So

I F2 = fc 2 = 2440 (MHz) • · (Equation 3-2)

Becomes

That is, the local frequency LO 1 emitted from the first local oscillator 24 a is

LOl = I F2- I F l = 2440-40 = 2400 (MHz)

· · · (Equation 3—3)

(See (c2) in Fig. 4).

Furthermore, in order to up-convert the second IF signal into an RF signal having a center frequency of 25 GHz, the local frequency LO 2 generated by the second local oscillator 34 is L02 = RF-IF 2 = 25−2.44 = 22 . 56GHz

· · · (Equation 3-4)

Becomes

Second embodiment>

Hereinafter, a second embodiment will be described.

FIG. 5 is a block diagram illustrating a configuration of a transmission device according to the second embodiment. The main difference from the first embodiment is that the baseband transmitting section 20 directly up-converts the baseband signal to the second IF transmission signal. The specifications of the modulator 10b and the controller 70b are partially different. Other configurations of the second IF transmission unit 30, the RF transmission unit 40, and the transmission / reception antenna 50 are the same as those in the example of the first embodiment.

The digital signal modulator 11b including the transmission signal generation means generates a baseband signal based on the information on the frequency band of the transmission signal transmitted by the control unit 70b. The baseband signal is filtered by a digital filter 12b having a low-pass filter function to remove unnecessary harmonic components such as a second harmonic and a third harmonic, and is converted from a digital signal to an analog signal by a DZA converter 13b. Is converted.

Next, the analogized baseband signal is passed through the baseband

15 and the input of the first frequency converter 23b at the baseband transmission amplifier 26. It is amplified to a signal power suitable for power. The baseband signal is up-converted in the first frequency converter 23 b into a second IF signal by a local signal input from the first local oscillator 24 b.

The transmission signal processing and control method from the time of up-conversion to the second IF signal to the transmission and reception antenna 50 is as described in the example of the first embodiment. Further, a transmission operation flow of the transmission device of the example of the second embodiment is the same as that of the first embodiment shown in FIG.

FIG. 6 is a diagram showing an example of a correlation between a filter and a transmission signal on the frequency axis according to the second embodiment of the present invention. FIG. 6 shows a case where there are three transmission frequency bands. The baseband low-pass filter 15 has the characteristic of the maximum pass frequency 3Δf, and the second IF band-pass filter 25 has It has the characteristics of center frequency fc2 and maximum pass frequency band 6Δf.

(A 2) of FIG. 6 is a correlation diagram relating to a signal when one channel is used for the transmission signal, and is the same as (a 2) of FIG. (A 3) in FIG. 6 is a correlation diagram for the baseband signal when one channel is used for the transmission signal. Reference numerals 18 1-3 denote the frequency characteristics of the baseband signal, and reference numerals 19 3 Indicates the frequency characteristic of the baseband low pass filter 15 and reference numeral 194 indicates the return frequency characteristic of the baseband low pass filter 15.

(B 2) of FIG. 6 is a correlation diagram relating to a signal when two channels are simultaneously used for a transmission signal, and is the same as (b 2) of FIG. (B 3) of FIG. 6 is a correlation diagram for the baseband signal when two channels are used simultaneously for the transmission signal, and reference numeral 182-2-3 indicates the frequency characteristic of the baseband signal. (C 2) of FIG. 6 is a correlation diagram relating to signals when three channels are simultaneously used for the transmission signal, and is the same as (c 2) of FIG. (C 3) in FIG. 6 is a correlation diagram for the baseband signal when three channels are simultaneously used for the transmission signal, and reference numeral 183-3 denotes the frequency characteristic of the baseband signal. A specific example of the transmitting apparatus according to the second embodiment will be described with reference to FIG. The frequency band of one channel is 20 MHz, the carrier center frequency (RF) of the RF signal is 25.00 GHz, and the carrier center frequency (fc2) of the signal in the second IF frequency band is 2440 MHz. The pass frequency band of the baseband low-pass filter 15 and the second IF band-pass filter 25 has characteristics that match the transmission signal band of the maximum channel (in this case, three channels). In Example 1 of the second embodiment, the pass frequency band of the baseband low-pass filter 15 is 30 MHz or less (from −30 MHz to +30 MHz including the return frequency of the signal), and the second IF band-pass The pass frequency band of the filter 25 is from 2410 MHz to 2470 MHz.

When only one channel is used for the transmission signal, the center frequency B B of the transmission signal in the baseband frequency band may be obtained by adding 2 Δf to 0 Hz.

BB = 0 + 2A f = 0 +2 X 1 0 = 20 (MHz)

• · (Equation 1—5)

Becomes

That is, a transmission signal having a center frequency of 20 MHz and a frequency band of 20 MHz may be generated by the signal generator 1 lb (see (a3) in FIG. 6).

Next, in order to up-compress the transmission signal of the baseband frequency band to the second IF frequency band, the center frequency IF2 of the transmission signal of the second IF frequency band is calculated by calculating 2 △ f from fc2. I just need to reduce it,

I F2 = f c 2-2A f = 2440- 2 X 1 0 = 2420 (MHz)

• · (Equation 1-6)

Becomes

That is, the local frequency L〇 1 generated by the first local oscillator 24 b is

LO 1 = IF 1 -BB = 2420-20 = 2400 (MHz)

• · (Equation 1—7) (See (a2) in Fig. 6).

Further, in order to up-convert the second IF signal into an RF signal having a center frequency of 25 GHz, the local frequency L〇2 generated by the second local oscillator 34 is given by: L02 = RF-IF 2 = 25−2.40 = 22. 60 GHz

· · · (Equation 1—8)

Becomes

If the transmission signal uses two channels simultaneously, the center frequency B B of the transmission signal in the baseband frequency band may be obtained by adding Δf to 0 Hz.

ΒΒ-0 + Δ f = 0 + 10 = 10 (MHz)

· · · (Equation 2—5)

Becomes

That is, a transmission signal having a center frequency of 10 MHz and a frequency band of 4 OMHz may be generated by the signal modulation unit 1 lb (see (b3) in FIG. 6).

Next, in order to up-compress the transmission signal in the baseband frequency band to the second IF frequency band, the center frequency IF2 of the transmission signal in the second IF frequency band is reduced by Δf from fc2. I just need to

I F2- f c 2-A f = 2440-10 = 2430 (MHz)

• · (Equation 2—6)

Becomes

That is, the oral frequency L O 1 emitted from the first local oscillator 24b is

LO 1 = IF 2— BB = 2430-10 = 2420 (MHz)

• · (Equation 2—7)

(See (b2) in Fig. 6).

Furthermore, in order to up-convert the second IF signal into an RF signal having a center frequency of 25 GHz, the local frequency L〇2 generated by the second local oscillator 34 is given by: L02 = RF-IF 2 = 25−2.42 = 22. 58 GHz • · (Equation 2-8)

Becomes

When the transmission signal uses three channels at the same time, the center frequency B B of the transmission signal in the baseband frequency band can be kept at 0 Hz.

BB = 0 (Hz)

• · (Equation 3—5)

Becomes

That is, a transmission signal having a center frequency of 0 Hz and a frequency band of 60 MHz may be generated by signal generation 1 lb (see (c3) in FIG. 6).

Next, the transmission signal of the baseband frequency band is up-compensated to the second IF frequency band.

—In order to achieve this, the center frequency IF 2 of the transmission signal in the second IF frequency band can be left as it is at f c 2,

I F2 = f c 2 = 2440 (MHz)

• · (Equation 3—6)

Becomes

LO 1 = IF 2— BB = 2440 _ 0 = 2440 (MHz)

• · (Equation 3—7)

(See (c2) in Fig. 6).

Further, in order to up-convert the second IF signal into an RF signal having a center frequency of 25 GHz, the local frequency L 02 generated by the first local oscillator 24b is given by: L02 = RF-IF 2 = 25−2.44 = 22 . 56GHz

• · (Equation 3—8)

Becomes

As described above, by providing the transmitting apparatus of the first embodiment or the second embodiment described above in a wireless communication apparatus, wireless signals using a plurality of frequency bands are not used. It becomes possible to transmit a radio signal transmitted from the line communication system. For example, the wireless communication device of the present invention can be used as a wireless communication terminal of a low-power wireless communication system in the 25 GHz band described in the section of the related art.

According to the transmission apparatus of the present invention, the number of filters for removing harmonic components ゃ noise components generated in a transmission signal generation stage is not increased for transmitting signals in different frequency bands, and the filter is not increased. It is possible to transmit radio signals in a plurality of different frequency bands without providing a switch circuit for switching evenings. As a result, the number of components can be reduced, which is effective in reducing manufacturing costs and miniaturizing the transmitting device.

In addition, unnecessary harmonic components such as a second harmonic and a third harmonic can be removed by a digital filter having a bandpass filter or a one-pass filter function. Even when a digital filter is not used, the effect of the invention can be obtained, and in that case, a further merit in cost can be expected.

Furthermore, in a wireless communication system using signals in a plurality of frequency bands, it is possible to transmit signals in all frequency bands used in the wireless communication system by providing the transmitting device of the present invention in the wireless communication device. become.

<Third Embodiment> 'Fig. 8 is a block diagram showing a configuration of a receiving apparatus according to a third embodiment. The receiving device includes a transmitting / receiving antenna 60, an RF receiving unit 80, a first IF converting unit 90, a second IF converting unit 100a, a signal demodulating unit 110a, a control unit 70c. It is composed of The configurations and functions of the transmitting / receiving antenna 60, the RF receiving unit 80, and the digital signal demodulating unit 100a are the same as those of the receiving device in FIG. 14 described above, but the first IF converting unit 90 and the The IF converter 100a of FIG. 14 is different from the receiver of FIG.

The RF receive signal input from the transmit / receive antenna 60 passes through the broadband RF bandpass filter 81, which passes the signal frequency band of all channels, and The signal is amplified by the RF receiving amplifier 84 via the exchanger 82. The signal output from RF receiving amplifier 84 is down-converted by first frequency converter 91 to a first IF received signal. The frequency of the first IF received signal is adjusted by the control unit 70c controlling the frequency of the local signal generated by the first local oscillator 94 according to the frequency band of the received signal.

The control unit 70c analyzes the control signal received in advance, detects the frequency band of the received signal, and sets the upper limit of the frequency band of the received signal to the upper edge of the first IF bandpass filter 92. The oscillation frequency of the first local oscillator 94 is controlled so that The first IF reception signal is mainly subjected to removal of noise components such as upper adjacent waves by passing through the first IF bandpass filter 92. The first IF receiving amplifier 93 having the automatic gain control function amplifies the first IF receiving signal so as to match the input level of the circuit at the subsequent stage. The automatic gain control function is controlled by the controller 70c based on the signal strength detected by the digital signal demodulator 113a.

The first IF reception signal output from first IF reception amplifier 93 is down-converted into a second IF reception signal by second frequency converter 10la. The frequency of the second IF reception signal can be varied by the frequency of the local signal generated by the second local oscillator 104a, and is controlled by the control unit 70c.

The control unit 70 c analyzes the preamble including the control signal received in advance, detects the frequency band of the received signal, and sets the lower limit of the frequency band of the received signal to the second IF bandpass filter 10 2 The oscillation frequency of the local oscillator 104a is controlled so that it is at the lower edge of. The first IF reception signal is mainly subjected to removal of noise components such as lower adjacent waves by passing through the second IF bandpass filter 102. The second IF receiving amplifier 103 amplifies the second IF receiving signal so as to match the input level of the AZD converter 111a at the subsequent stage.

The second IF reception signal is converted from an analog signal to a digital signal by the AZD converter 111a, and the digital reception filter 112a further removes noise components and the like. Then, the received signal is demodulated by the digital signal demodulator 1 13 a that performs IF frequency sampling.

FIG. 9 is a flowchart showing a receiving method of the receiving apparatus according to the third embodiment of the present invention, and FIG. 10 shows an example of a received signal frequency characteristic of the embodiment according to the present invention on a frequency axis. FIG. 11 is a diagram showing an example of a correlation between a received signal and a received signal on a frequency axis according to the third embodiment of the present invention.

Hereinafter, the receiving method of the receiving apparatus according to the present invention will be described mainly with reference to FIG. 9 and also to FIGS. 8, 10 and 11 as appropriate.

In the present embodiment, signals in three frequency bands as shown in (a), (b), and (c) of FIG. 10 are used. (A) in Fig. 10 shows the received signal when only one channel is used. The carrier frequency is fc; the frequency band is 2 Af (Δf is the half bandwidth of the frequency band of one channel). It is. (B) of FIG. 10 shows a received signal when two channels are used simultaneously, where the carrier frequency is fc and the frequency band is 4. (C) of FIG. 10 shows a received signal when three channels are used simultaneously, and the carrier frequency is f c and the frequency band is 6Δί.

First, in step S21 of FIG. 9, the receiving apparatus receives control information issued by its own communication system in order to obtain information necessary for wireless communication such as its own receiving time and frequency band of a received signal. Try. Since the frequency band of the preamble signal containing the control information is usually determined in advance by the communication protocol, the control unit 70c adjusts the first local oscillator according to the frequency band conforming to the communication protocol. The local frequency generated by the local oscillator 104 and the second local oscillator 104a is set. For example, if the frequency band of the control signal is predetermined as one channel (2ΔΠ), the local frequencies generated by the first local oscillator 94 and the second local oscillator 104a are The frequency is adjusted to receive the received signal of channel 1. In the next step S22, control signal reception is tried while scanning each channel. View. If the control signal cannot be received, the reception is tried again after a certain time, and this step is repeated until the control signal can be received.

If the control signal can be received, the demodulation process of the control signal is performed by the digital signal demodulation unit 113a in step S23, and the control unit 70c analyzes the demodulated data of the control signal. In the next step S24, the control unit 70c detects information necessary for reception, such as reception timing, a channel to be used, and a frequency band, from the analyzed control information. In the next step S25, the control unit 70c adjusts the oral frequency of the first local oscillator 94 based on the analyzed information such as the frequency band, and Adjust so that the upper limit frequency is at the upper edge of the first first IF band bus filter 92 (fc + 2 △ f for 1-channel signal). In step S26, the control unit 70c adjusts the local frequency of the first local oscillator 94 so that the lower limit frequency of the second IF reception signal is lower than the lower frequency of the second IF bandpass filter 102. Adjust so that it comes to the edge (fc_2Af for 1-channel signal). In the next step S27, the data signal is received, the radio signal is demodulated, and the received data is delivered to a data processing device such as a computer (PC). In the next step S28, if another reception process is to be performed subsequently, the process returns to step S21, and if another reception process is not to be performed, the reception operation ends.

Next, the correlation between the received signal and the received signal will be described with reference to FIG. FIG. 11 shows a case where there are three reception frequency bands, and the first IF node path filter 92 has a characteristic of a center frequency fc 1 and a pass frequency band of 6 △ f. The bandpass filter 102 of Fig. 2 has the characteristics of center frequency fc2 and pass frequency band 6Af. The pass frequency band of the bandpass filter 92, 102 is set according to the received signal having the maximum frequency band. In other words, the pass frequency band of each band bus filter is (maximum number of simultaneously transmittable channels X 2 Δf).

Figure 11 (al) shows the first IF reception when one channel is used for the reception signal. FIG. 2 is a correlation diagram relating to the received signal, where reference numeral 281-1 indicates the frequency characteristic of the first IF received signal, and reference numeral 291 indicates the frequency characteristic of the first IF bandpass filter 92. (A 2) of FIG. 11 is a correlation diagram regarding the second IF received signal when one channel is used for the received signal, and reference numeral 281-2 denotes the frequency characteristic of the second IF received signal. Reference numeral 292 indicates the frequency characteristics of the second IF bandpass filter 102.

(Bl) in Fig. 11 is a correlation diagram regarding the first IF received signal (SIF 1) when two channels are used for the received signal, and reference numeral 282_1 denotes the frequency of the first IF received signal. The characteristics are shown. (B2) of FIG. 11 is a phase diagram relating to the second IF received signal when two channels are simultaneously used for the received signal, and reference numeral 282-2 denotes a frequency characteristic of the second IF received signal. .

(C 1) in FIG. 11 is a correlation diagram regarding the first IF received signal when three channels are simultaneously used for the received signal, and reference numeral 283-1 indicates the frequency characteristic of the first IF received signal. I have. (C 2) of FIG. 11 is a correlation diagram regarding the second IF received signal when three channels are simultaneously used for the received signal, and reference numeral 283-2 indicates the frequency characteristic of the second IF received signal. .

A specific example of the receiving device according to the first embodiment will be described with reference to FIG. The frequency band of one channel is 20 MHz, the carrier frequency of the RF signal is 25.00 GHz, the carrier signal of the first IF frequency band is 2440 MHz, and the carrier of the second IF frequency band is 2440 MHz. The signal center frequency (fc2) is 40 MHz. The pass frequency bandwidth of the first IF band-pass filter 92 and the second band-pass filter 102 has characteristics that match the signal bandwidth of the maximum channel (in this case, three channels). In the example of the third embodiment, the passing frequency band of the first IF bandpass filter 92 is 2410 MHz to 2470 MHz, and the passing frequency band of the second IF bandpass filter 102 is 10 MHz to 70 MHz. is there. If the received signal uses only one channel, in order to down-convert the RF received signal to the first IF frequency band, the received signal center frequency IF1 of the first IF frequency band is represented by 2 in fc1. What is necessary is just to add Δf.

IF 1

I F l = f c l + 2A f = 2440 + 2X l 0 = 2460 (MHz)

(Equation 1 1— 1)

Becomes

That is, the oral frequency L〇 1 emitted from the first local oscillator 94 is

LO 1 = RF 1-IF 1 = 25-2.46 = 22.54 (GHz)

(Equation 11-2)

(See (a1) in Fig. 11).

Next, in order to down-compare the received signal of the first IF frequency band to the second IF frequency band, the center frequency IF2 of the received signal of the second IF frequency band is 2 △ from fc 2. Since we only need to reduce f

I F 2 = f c 2— 2 Δ f = 40— 2 X 10 = 20 (MHz)

(Equation 11-3)

Becomes

That is, the local frequency L〇 2 generated by the second local oscillator 104 is

LO2 = I F l- I F2 = 2460-20 = 2440 (MHz)

(Equation 11-4)

(See (a2) in Fig. 11).

If the received signal uses two channels at the same time, in order to down-convert the RF received signal to the first IF frequency band, the received signal center frequency IF1 of the first IF frequency band must be fc1 Since we only need to add Δf,

I F l = f c 1 + A f = 2440 + 10 = 2450 (MHz)

(Equation 12— 1) Becomes

That is, the frequency LO1 of the local signal generated by the first local oscillator 94 is L01 = RFl-IFl = 25-2.45 = 22.55 (GHz)

(Equation 12-2)

(See (b1) in Fig. 11).

Next, in order to down-convert the received signal of the first IF frequency band to the second IF frequency band, the received signal center frequency IF2 of the second IF frequency band is obtained by subtracting △ f from fc2. I just need to reduce it,

I F2 = f c 2-A f = 40-10 = 30 (MHz)

(Equation 12-3)

Becomes

That is, the frequency L〇2 of the oral signal generated by the second local oscillator 44 is LO2 = IFl-IF2 = 2450-30 = 2420 (MHz)

(Equation 12—4)

(See (b2) in Fig. 11).

When the received signal uses three channels at the same time, in order to down-convert the RF received signal to the first IF frequency band, the received signal center frequency IF1 of the first IF frequency band is directly fc 1 So,

I F l = f cl = 2440 (MHz)

(Equation 13-1)

Becomes

That is, the frequency L〇 1 of the local signal generated by the first local oscillator 94 is L〇 1 = RF 1—IF 1 = 25-2.44 = 22.56 (GHz)

(Equation 13-2)

(See (c1) in Fig. 11).

Next, the received signal of the first IF frequency band is converted to the second IF frequency band. In order to achieve this, the received signal center frequency IF2 in the second IF frequency band can be left as it is at fc2.

I F2 = f c 2 = 40 = 40 (MHz)

(Equation 13-3)

Becomes

That is, the frequency L〇2 of the local signal generated by the first local oscillator 94 is LO2 = IFl-IF2 = 2440-40 = 2400 (MHz)

(Equation 13-4)

Therefore, the second local oscillator 104 only needs to generate a local signal of 2400 MHz (see (c2) in FIG. 11).

Hereinafter, a fourth embodiment will be described.

FIG. 12 is a block diagram showing a configuration of a receiving apparatus according to the fourth embodiment. The main difference from the third embodiment is that the first IF reception signal is directly down-converted to a baseband signal in the second IF conversion section 10 Ob. The specifications of the signal demodulation unit 110b and the control unit 70d are partially different. The other configuration of the transmitting / receiving antenna 60, the RF receiving unit 80, and the first IF converting unit 90 are the same as those of the third embodiment. The received signal processing and control method from the transmitting / receiving antenna 60 to the output of the first IF receiving amplifier 93 is as described in the example of the third embodiment.

The first IF reception signal output from first IF reception amplifier 93 is down-converted into a baseband reception signal by second frequency converter 10 lb. The frequency of a local signal for down-converting to a baseband received signal differs depending on the frequency band of the signal. In accordance with the frequency band of the signal, the control unit 70d controls the frequency of the local signal generated by the second local oscillator 104b. The control unit 70d resolves the control signal generated by the own system received in advance. In prayer, we detect the frequency band of the received signal, and set the local oscillator 104 b so that the folded frequency at the lower limit of the frequency band of the received signal comes to the edge of the baseband one-pass filter 105. Control the oscillation frequency of The baseband reception signal is mainly subjected to removal of noise components such as lower adjacent waves by passing through the second IF bandpass filter 102. The baseband reception amplifier 106 amplifies the baseband reception signal so as to match the input level of the AZD converter 111 in the subsequent stage.

The baseband received signal is converted from an analog signal to a digital signal by the AZD converter 111b, and the digital signal is further demodulated by the digital receive filter 112b to remove noise components and perform baseband frequency sampling. The received signal is demodulated by the unit 113 b.

The receiving operation flow of the receiving apparatus of the example of the fourth embodiment is the same as that of the third embodiment shown in FIG. 11, and a detailed description is omitted.

FIG. 13 is a diagram showing, on the frequency axis, an example of the correlation between a received signal and a filter according to the fourth embodiment of the present invention. FIG. 13 shows a case where there are three reception frequency bands, and the first IF bandpass filter 92 has characteristics of a center frequency fc 1 and a pass frequency band 6 Δf, The low-pass filter 105 has the characteristic of the maximum pass frequency 3Δf.

(Al) in FIG. 13 is a correlation diagram relating to the first IF received signal when one channel is used for the received signal, and is the same as (a1) in FIG. 11 described above. (A 3) in FIG. 13 is a correlation diagram regarding the baseband received signal when one channel is used for the received signal. Reference numeral 3 denotes a frequency characteristic of the baseband low-pass filter 105, and reference numeral 294 denotes a folded frequency characteristic of the base-span low-pass filter 105.

(B l) in Fig. 13 shows the first case where two channels are used simultaneously for the received signal.

FIG. 11 is a correlation diagram regarding an IF reception signal, which is the same as (a 2) in FIG. (B 3) of FIG. 13 is a correlation diagram regarding the baseband received signal when two channels are simultaneously used for the received signal, and reference numeral 282-3 denotes the frequency characteristic of the baseband received signal.

(C1) in FIG. 13 is a correlation diagram regarding the first IF received signal when three channels are simultaneously used for the received signal, and is the same as (a3) in FIG. 11 described above. (C 3) of FIG. 13 is a correlation diagram relating to the baseband received signal when three channels are simultaneously used for the received signal, and reference numeral 282-3 indicates the frequency characteristic of the baseband received signal.

A specific example of the receiving device according to the fourth embodiment will be described with reference to FIG. The frequency band of one channel is 20 MHz, the carrier center frequency (RF1) of the RF signal is 25.00 GHz, and the carrier center frequency (fc1) of the first IF frequency band is 2440 MHz. The passing frequency band of the first IF band pass filter 92 has characteristics that match the reception signal band of the maximum channel (in this case, three channels). In the example of the fourth embodiment, the pass frequency band of the first IF bandpass filter 22 is from 2410 MHz to 247 OMHz, and the pass frequency band of the baseband lowpass filter 105 is 3 OMHz or less (the signal folding frequency is also lower). (Including — 30 MHz to +30 MHz).

When only one channel is used for the received signal, the method of down-converting the RF received signal to the first IF frequency band is the same as in the above (Equation 11-11) and (Equation 11-12). Then, 101 becomes 22.54 (GHz) (see (a1) in Fig. 13).

Next, in order to down-compress the received signal of the first IF frequency band to the baseband frequency, the carrier center frequency BB of the baseband frequency band is deviated by 2 Δf from the baseband carrier frequency 0 Hz. So it's fine

BB = 0-2 m f = _2X 10 = _20 (MHz)

(Equation 11-5) Becomes

That is, the oral frequency L〇3 emitted from the second local oscillator 44b is

LO3 = I F l-BB = 2440 + 20 = 2460 (MHz)

(Equation 1 1— 6)

(See (a3) in Fig. 13).

If the received signal uses two channels at the same time, the method of down-converting the RF received signal to the first IF frequency band is obtained by the same method as in (Equation 12-1) and (Equation 12-2). Then, 01 becomes 22.55 (GHz) (see (b1) in Fig. 13).

Next, in order to down-compress the received signal of the first IF frequency band to the baseband frequency, the carrier center frequency BB of the baseband frequency band is obtained by subtracting △ f from the baseband carrier frequency 0 Hz. So good

ΒΒ = 0-Δ f =-10 = -10 (MHz)

(Equation 12 _ 5)

Becomes

That is, the local frequency L O 3 generated by the third local oscillator 104b is L03 = IF1−BB = 2440 + 10 = 2450 (MHz)

(Equation 12-6)

(See (b3) in Fig. 13).

If the received signal uses three channels at the same time, the RF

The method of down-conversion to the F frequency band is obtained by the same method as in the above (Equation 13-1) and (Equation 13-2), and 〇1 is 22.56 (GHz) (Fig. 13 (c 1)).

Next, in order to down-convert the received signal of the first IF frequency band to the baseband frequency, the carrier center frequency BB of the baseband frequency band becomes the same as the baseband carrier frequency 0 Hz. BB = 0— △ f = 0 (Hz)

(Equation 13—5)

Becomes

That is, the local frequency L 03 generated by the third local oscillator 104b is LO3 = I F l-BB = 2440-0 = 2440 (MHz)

(Equation 13-6)

(See (c3) in Fig. 13).

The detection of the frequency band of the received signal has been performed by the control unit, but another device may be provided and detected there. Further, although the number of IF conversion units is two, the number is not limited to this, and may be one or three.

As described above, by providing the receiving apparatus of the third embodiment or the fourth embodiment described above in a wireless communication apparatus, it is possible to transmit wireless signals transmitted from a wireless communication system using signals in multiple frequency bands. A signal can be received. For example, the wireless communication device of the present invention can be used as a wireless communication terminal of a low-power wireless communication system in the 25 GHz band described in the section of the related art.

According to the receiving apparatus of the present invention, a switch circuit for switching the filter without increasing the number of filters for removing adjacent waves and noise of the received signal to receive signals in different frequency bands. It is possible to demodulate wireless signals in a plurality of different frequency bands without providing a particular frequency band.

As a result, the number of components can be reduced, which is effective in reducing manufacturing costs and downsizing the receiving device.

Further, in a wireless communication system using signals in a plurality of frequency bands, the reception device of the present invention is provided in the wireless communication device to receive signals in all frequency bands used for transmission in the wireless communication system. It becomes possible.

Industrial applicability The transmitting device, the receiving device, and the wireless communication device provided with the same according to the present invention can be used in a personal area assuming outdoor Internet access at a hot spot such as a station or a coffee shop. This is useful for a wireless communication system used in a community area or the like that assumes a wireless home link.

Claims

The scope of the claims

1. A modulation unit that modulates an input signal into a first intermediate frequency signal in a predetermined frequency band, an IF conversion unit that converts the first intermediate frequency signal into a high-frequency signal, and an RF transmission unit that transmits the high-frequency signal And a control unit for controlling each unit, wherein the modulation unit modulates the first intermediate frequency signal, and the first intermediate frequency signal passes the first intermediate frequency signal. With the first IF Fill

The control unit adjusts and sets the frequency of the modulation unit so that the edge of the frequency band of the first intermediate frequency signal is aligned with the edge of the pass frequency band of the first IF filter. apparatus.

2. The IF conversion unit:

A first frequency conversion means for converting the first intermediate frequency signal modulated by the modulation section into a second intermediate frequency signal, and a second IF filter for passing the second intermediate frequency signal. A first IF converter,

A second IF conversion unit comprising second frequency conversion means for converting the second intermediate frequency signal into a high-frequency signal,

The control unit includes:

The frequency of the modulation section is adjusted and set so that the edge of the frequency band of the first intermediate frequency signal is aligned with the edge of the pass frequency band of the first IF filter, and the pass frequency band of the second filter is set. 2. The transmission device according to claim 1, wherein the frequency of the first frequency conversion means is adjusted and set so that an edge of the frequency band of the second intermediate frequency signal is aligned with an edge of the second intermediate frequency signal.

3. The modulation unit includes a digital filter for removing unnecessary harmonic components of the intermediate frequency signal, and DZA conversion means for converting a signal passed through the digital filter into an analog signal,

The control unit may control the edge of a pass frequency band of the digital filter to the first frequency. 3. The transmission device according to claim 1, wherein a frequency of the modulation unit is adjusted and set so that an edge of a frequency band of the intermediate frequency signal is aligned.

4. The transmission device according to claim 1, wherein the first IF filter is a bandpass filter or a mouth-to-pass filter.

5. The transmitting device according to claim 3, wherein the digital filter is a digital filter having a band-pass filter function or a low-pass filter function.

6. The transmitting apparatus according to claim 2, wherein the second IF filter is a band-pass filter or a high-pass filter.

7. A modulation unit that modulates the input signal into a baseband signal of a predetermined frequency band, an IF conversion unit that converts the baseband signal via an intermediate frequency or into a high-frequency signal, and an RF that transmits the high-frequency signal A transmission device comprising a transmission unit and a control unit for controlling each unit,

The modulation unit includes: signal modulation means for modulating the baseband signal; and the verse band filter for passing the baseband signal.

The transmission device, wherein the control unit adjusts and sets a frequency of the modulation unit so that an edge of a frequency band of the baseband signal is aligned with an edge of a pass frequency band of the baseband filter.

8. The IF conversion unit:

A first frequency conversion unit that converts a baseband signal modulated by the modulation unit into an intermediate frequency signal, and a first IF conversion unit that includes an IF filter that passes the intermediate frequency signal;

A second IF conversion unit including second frequency conversion means for converting the intermediate frequency signal into a high frequency signal,

The control unit includes: The frequency of the modulation unit is adjusted and set so that the edge of the frequency band of the baseband signal is aligned with the edge of the passband of the baseband filter, and the edge of the intermediate frequency signal is set at the edge of the passband of the IF filter. 8. The transmitting apparatus according to claim 7, wherein a frequency of said first frequency conversion means is adjusted and set so as to align edges of a frequency band.

9. The modulation section includes a digital filter for removing unnecessary harmonic components of the baseband signal, and D / A conversion means for converting a signal passed through the digital filter into an analog signal,

8. The control unit according to claim 7, wherein the control unit adjusts and sets a frequency of the modulation unit so that an edge of a frequency band of the baseband signal is aligned with an edge of a pass frequency band of the digital filter. Or the transmission device according to item 8.

10. The transmitting apparatus according to claim 7, wherein the baseband filter is a low-pass filter.

11. The transmitting apparatus according to claim 9, wherein the digital filter is a digital filter having a function of a one-pass filter. 9. The transmission device according to claim 7, wherein:

1 3. A wireless communication device comprising the transmission device according to any one of claims 1 to 12.

1 4. An RF receiver that receives a high-frequency signal, an IF converter that converts the high-frequency signal to an intermediate frequency signal, a demodulator that demodulates the intermediate frequency signal, and a control unit that controls each unit. Device

The IF conversion unit includes: a frequency conversion unit configured to convert a high-frequency signal received by the RF reception unit into an intermediate frequency signal; and a filter configured to pass a signal of a predetermined frequency band of the converted intermediate frequency signal. With

The control unit may include an intermediate frequency signal at an edge of a pass frequency band of the filter. A receiver for adjusting and setting the frequency of the local signal of the frequency conversion means so that the edges of the frequency band are aligned.

1 5. Equipped with detection means for detecting the frequency band of the received signal from the received harmonic signal,

15. The control unit according to claim 14, wherein the control unit adjusts and sets a frequency of an oral signal of the frequency conversion unit based on a frequency band of the received signal.

1 6. The demodulation unit demodulates a control signal of a specific frequency band including the information of the frequency band,

16. The receiving apparatus according to claim 15, wherein said detecting means detects a frequency band of the received signal based on the demodulated control signal.

17. The IF conversion section includes a first IF conversion section having first frequency conversion means and a first filter, and a second IF conversion section having second frequency conversion means and a second filter. Department and

The frequency setting means includes a local signal of the first frequency conversion means such that an upper or lower edge of a frequency band of the intermediate frequency signal is aligned with an upper or lower edge of a pass band of the first filter. The frequency of the local signal of the second frequency conversion means is set such that the lower or upper edge of the frequency band of the intermediate frequency signal is aligned with the lower or upper edge of the pass band of the second filter. Set forth in claims 14, 15 or 16 characterized by the following:

18. The receiving apparatus according to claim 17, wherein the first filter is a band-pass filter or a mouth-to-pass filter.

19. The receiving apparatus according to claim 17, wherein the second filter is a band-pass filter or a high-pass filter.

20. A receiving device according to any one of claims 14 to 19, Wireless communication device.