JPH11340860A - Multi-band mobile radio equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a radio equipment to make normal communication in all selectable system communication areas, even when the magnitude correlation between a carrier frequency and a local frequency is changed. SOLUTION: When the frequency of a local signal generated by a local oscillator 31 is lower than a carrier frequency, a control section C1 gives an instruction to changeover switches 1011, 1012 to provide an output of a signal received at a 1st input terminal as a tone signal. On the other hand, when the frequency of the local signal generated by the local oscillator 31 is higher than the carrier frequency, the control section C1 gives an instruction to changeover switches 1051, 1052 to provide the output of a signal received at a 2nd input terminal as a tone signal. Thus, orthogonal data for which the phase of a Q signal always leads that of an I signal by 90 degrees are outputted to a post-stage data recovery section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to two systems, for example, GSM900 (Global System for Mobile
ommunication at 900MHz) and DCS1800 (Digital
The present invention relates to a multi-band mobile radio capable of selectively using one of communication bands used in a cellular system at 1800 MHz).

[0002]

2. Description of the Related Art A single mobile radio can transmit two system communication bands, for example, a GSM900 communication band and a DCS180.
Some communication bands can selectively use one of the 0 communication bands. Such a mobile radio is called a multi-band mobile radio, and when the high-frequency signal processing unit is configured by a superheterodyne system, the radio frequencies fDCS and fGSM of the above two system communication bands and their local oscillation (local) frequencies are used. FIG. 1 shows the magnitude relationship between fLoD and fLoG.
6 (fLoG <fGSM, fLoD <fDCS), FIG.
G> fGSM, fLoD <fDCS), FIG. 18 (fLoG> fGS
M, fLoD> fDCS), FIG. 19 (fLoG <fGSM, fLoS).
D> fDCS).

In these figures, fIF is an intermediate frequency, a frequency difference between a radio frequency fDCS and a local frequency fLoD, and a radio frequency fGSM and a local frequency fLoG.
So that the frequency difference between them is the intermediate frequency fIF,
Set the frequency of local frequency fLoD, fLoG.

According to the setting of the local frequency, the low frequency part after the intermediate frequency conversion has the same frequency when communicating in either system band, so that the same signal processing circuit can be used. Becomes

[0005] When a local signal frequency is set between both system communication bands as shown in FIG. 17 and the frequency of fIF is properly selected, fLoD and fLoG are obtained as shown in FIG.
Becomes very narrow, and these two local signals can be obtained by one synthesizer device.

FIG. 15 shows an example of a typical block configuration of a high-frequency signal processing section of a multi-band mobile radio. First, the transmission system will be described. Baseband I and Q signals are each converted to an intermediate frequency by a quadrature modulator 28 and then combined.

The IF of the intermediate frequency obtained by the above synthesis
The signal is amplified by an IF amplifier 27, limited to a predetermined band by a filter 26, input to a mixer 14, and mixed with a local signal generated by a local oscillator 31.

[0008] The signal obtained by this mixing is:
The band is limited to only the RF signal of a desired band by being input to the filter 24, and the RF signal obtained by this is input to the RF amplifier 23.

The RF signal is high-frequency amplified to a predetermined level by an RF amplifier 23, and unnecessary high-frequency components are cut by a filter 22 and radiated from a transmitting antenna 21 toward a base station.

On the other hand, in the receiving system, the RF signal from the base station received by the receiving antenna 11 is amplified to a predetermined level by the RF amplifier 12 and then filtered by the filter 13.
The band is limited by and the components other than the high frequency component in the desired band are cut.

The RF signal band-limited by the filter 13 is mixed with a local signal generated by a local oscillator 31 by a mixer 14 and then input to a filter 15 to be band-limited to an IF signal of a desired band. Limited.

The IF obtained by this band limitation
The signal is amplified at a predetermined gain by an IF amplifier 16 and then demodulated by a quadrature demodulator 17 into baseband I and Q signals.

Next, a phase-modulated signal is obtained from the received signal in the receiving system of the high-frequency signal processing unit, and the I / Q
The operation of demodulating a signal will be described. FIG. 21 shows a part of the receiving system of the high-frequency signal processing unit.
In this figure, similarly to FIG. 15, 14 is a mixer, 15 is a filter, 16 is an IF amplifier, 17 is a quadrature demodulator, and 31 is a local oscillator.

The quadrature demodulator 17 includes an oscillation circuit 171
, Mixers 172, 174, filters 173, 175
And the oscillation circuit 171 includes an oscillator 171
1 and a phase shifter 1712 (π / 2). The phase-modulated signal s (t) is generally expressed by the following equation.

[0015]

(Equation 1)

Here, A is the amplitude, ωc is the angular frequency of the carrier wave [red / sec], and φi (t) is phase information that changes depending on the transmission data. If the output wave of the local oscillator 31 is Lo (t), Lo (t) is expressed as follows.

[0017]

(Equation 2)

In the above equation, B is the output amplitude of the local oscillator 31, and ωL is the angular frequency of the local oscillator 31. From the equations (1) and (2), the output of the mixer 14 is expressed by the following equation.

[0019]

(Equation 3)

In the above equation, G is the conversion gain of the mixer 14. Here, the first item of Expression (3) represents a signal to be converted to a high frequency side of the two sidebands,
The second item indicates a signal to be converted to a lower frequency side. Since the mixer 14 is a down converter, the high frequency side is removed by the filter 15 and only the low frequency side of the second item is output.
Therefore, the output of the filter 15 is as follows.

[0021]

(Equation 4)

The output of the filter 15 is supplied to the IF amplifier 1
After being amplified by 6, the signals are divided into two and mixed by mixers 172 and 17
4 respectively.

On the other hand, the tone signal generated by the oscillator 1711 is divided into two, and one of them is input to the mixer 172 without phase shift. The remaining one is a phase shifter 171.
2, the phase is shifted by π / 2,
The signal becomes a signal orthogonal to the tone signal input to the mixer 2, and is input to the mixer 174.

Here, of the tone signals generated by the oscillator 1711, the signal input to the mixer 172 is designated as LQ (t), and the phase shifter 1712 advances the phase by 90 degrees.
Assuming that the signal to be input to 4 is LI (t), LQ (t) and LI (t) can be respectively expressed as follows.

[0025]

(Equation 5)

In the above equation, ωIF is the oscillator 1711
Is the angular frequency of the tone signal generated by The amplitude of each signal is set to 1 for simplicity. Mixer 17
2, the IF signal from the IF amplifier 16 and the oscillation circuit 1
The tone signal from the tone generator 71 is mixed. The mixing result is expressed by the following equation based on equations (4) and (5).

[0027]

(Equation 6)

Similarly, mixer 174 includes IF amplifier 1
6 and the tone signal from the phase shifter 1712 are mixed. The result of the mixing is expressed by the following equation from equations (4) and (6).

[0029]

(Equation 7)

In the above equation, to simplify the equation, G
r = G · A · B · 1/2 · 1/2. This relationship will be used in the following equations. To set the difference between the carrier frequency of the desired signal and the local frequency as the intermediate frequency, the oscillator 171 is used.
Let the frequency of the tone signal generated in step 1 be the intermediate frequency. That is, | ωc−ωL | = ωIF.

At this time, the outputs of the mixers 172 and 174 include the signal converted to the baseband and the intermediate frequency 2.
Double frequency components are included. Therefore, only the baseband signals are extracted by the filters 173 and 175.

However, the outputs of the mixers 172 and 174 shown in the equations (7) and (8) indicate whether the first item is a baseband signal or the second item is a baseband signal, depending on the carrier frequency. And the local frequency. That is, when ωc> ωL and when ωc <
It differs from the case of ωL.

First, consider a case where the local frequency ωL is set lower than the carrier frequency ωc (ωc> ωL). In this case, the relationship ωc−ωL = ωIF holds, so the output of the mixer 172 (formula (7)) is as shown in the following formula.

[0034]

(Equation 8)

Then, from this, at the filter 173,
Since only the second term which is a baseband signal is extracted, the output of the filter 173 is shown as follows.

[0036]

(Equation 9)

On the other hand, the output of the mixer 174 (formula (8)) is as follows.

[0038]

(Equation 10)

Then, from this, at the filter 174,
Since only the first term which is a baseband signal is taken out, the output of the filter 174 is shown as follows.

[0040]

[Equation 11]

Next, consider the case where the local frequency ωL is set higher than the carrier frequency ωc (ωc <ωL). In this case, since the relationship of ωc−ωL = −ωIF holds, the output of the mixer 172 (formula (7)) is as shown in the following formula.

[0042]

(Equation 12)

Then, from this, at the filter 173,
Since only the first term which is the baseband signal is extracted, the output of the filter 173 is shown as follows.

[0044]

(Equation 13)

On the other hand, the output of the mixer 174 (formula (8)) is as shown in the following formula.

[0046]

[Equation 14]

Then, from this, at the filter 174,
Since only the second term which is a baseband signal is extracted, the output of the filter 174 is shown as follows.

[0048]

(Equation 15)

In summary, when the local frequency is set lower than the carrier frequency, the filter 17
The outputs of 3,175 are as follows.

[0050]

(Equation 16)

That is, as shown in FIG.
The phase of the output of the filter 173 is advanced by 90 degrees with respect to the phase of the output of 75. In the vector diagram shown in FIG. 24, equation (12) is taken on the x-axis, and equation (10) is taken on the y-axis.

On the other hand, when the local frequency is set higher than the carrier frequency, the outputs of the filters 173 and 175 are as shown in the following equations.

[0053]

[Equation 17]

That is, as shown in FIG.
The phase of the output of the filter 173 is delayed by 90 degrees from the phase of the output of 75. In the vector diagram shown in FIG. 25, equation (16) is taken on the x-axis, and equation (14) is taken on the y-axis.

As described above, if the local frequencies are set for the carrier frequencies of the two system bands as shown in FIG. 17 (or FIG. 20) or FIG. 19, when the system communication band to be used changes, the local frequencies are changed. The magnitude relationship between the frequency and the carrier frequency changes.

When such a frequency setting is performed, if the configuration shown in FIG. 21 is used for the receiving system of the super-heterodyne multi-band mobile radio, demodulation is obtained when the system communication band changes. There has been a problem that the phase relationship between the two baseband signals changes and normal reception cannot be performed.

This problem occurs not only in the configuration shown in FIG. 21 but also in the configuration shown in FIG. FIG.
21 is similar to the configuration shown in FIG. 21, but differs in that the oscillation circuit 171 in FIG. The oscillation circuit 181 includes an oscillator 1711 and a phase shifter (−π /
4) 1713 and a phase shifter (π / 4) 1714.

In this oscillation circuit 181, the oscillator 1711
Is divided into two, and one phase is advanced by 45 ° by the phase shifter 1713 and input to the mixer 172, and the other phase is delayed by 45 ° and input to the mixer 174.

With such a configuration, even if the phase of the local signal input to the mixer 172 is orthogonal to the phase of the local signal input to the mixer 174, the above-described problem is similarly caused. Occur.

In the above description, the receiving system of the high-frequency signal processing unit has been described. However, a similar problem occurs in the transmitting system. Hereinafter, the transmission system of the high-frequency signal processing unit will be described with reference to FIG.

FIG. 23 shows a part of the transmission system of the high-frequency signal processing section. In this figure, 25 is a mixer, 26 is a filter, 27 is an IF amplifier,
28 indicates a quadrature modulator, and 31 indicates a local oscillator.

The quadrature modulator 28 includes an oscillation circuit 281
, Mixers 282 and 283, and an adder 284. The oscillation circuit 281 includes an oscillator 2811 and a phase shifter 2812 (π / 2). An I signal and a Q signal are input as orthogonal data from a data generator (not shown). Of these, mixer 282 provides Q as a modulation signal.
The signal is input to the mixer 283, and the modulated signal
A signal is input. The I signal and the Q signal are generally represented by the following equations.

[0063]

(Equation 18)

Here, A is the amplitude, ωc is the angular frequency of the carrier wave [red / sec], and φi (t) is the transmission data. Further, the tone signal output LQ (t) generated by the oscillator 2811 is divided into two, and the mixer 282 and the phase shifter 28
12 is input. In the phase shifter 2812, the phase of LQ (t) is advanced by π / 2 and input to the mixer 283 as LI (t). Note that LQ (t) and LI (t) are represented as follows.

[0065]

[Equation 19]

In the above equation, ωIF is the oscillator 2811
And the amplitude of both signals is set to 1 for simplicity. From the expressions (17) and (19), the output of the mixer 282 is represented by the following expression (21), and the expressions (18) and (20)
Therefore, the output of the mixer 283 is represented by the following equation (22).

[0067]

(Equation 20)

The outputs of these mixers are added to an adder 28.
After being added at 4 and amplified at a predetermined gain by the IF amplifier 27, the intermediate frequency signal that has been filtered by the filter 26 and phase-modulated is input to the mixer 25.

[0069]

(Equation 21)

The mixer 25 converts the intermediate frequency signal represented by the above equation into a local signal L generated by the local oscillator 31.
Up-convert using (t) = Bcos (ωLt). The output of the mixer 25 is shown below. In the above equation,
In order to simplify the equation, it is assumed that Gt = A · B · 1/2.

[0071]

(Equation 22)

Here, of the two terms in equation (24), one is a desired radio frequency signal and the other is an image signal. This image signal is not actually transmitted after being removed by the filter 24 or the like. However, whether the first term becomes a desired wave or the second item becomes a desired wave depends on the magnitude relationship between the local frequency and the desired wave frequency. Change.

When the local frequency is set lower than the desired wave frequency, the first item of the equation (24) is extracted by the filter 24 or the like, and the second item is attenuated. At this time, the desired wave angular frequency ωc is ωc = ωL + ωIF, and the radio frequency is higher than the local frequency by an intermediate frequency.

When the local frequency is set to be higher than the desired wave frequency, the filter (24) or the like is used to obtain the equation (2).
The second item of 4) is taken out, and the first item is attenuated. The desired wave angular frequency ωc at this time is ωc = ωL−ωIF,
The radio frequency is lower than the local frequency by an intermediate frequency.

As described above, both the sideband generated above the local frequency and the sideband generated below the local frequency can be used as a radio modulation signal by setting the filter 24. Due to the change of the communication band, the sign of the phase data included in the radio modulation signal is reversed (in the first and second items of Expression (24), φi
The sign of (t) is reversed).

Therefore, when the local frequencies are set as shown in FIG. 17 (or FIG. 20) and FIG. 19 with respect to the carrier frequencies of the two system communication bands, the superheterodyne multi-band mobile radio is used. When the system communication band is switched using the configuration as shown in FIG. 23 for the transmission system, the polarity (rotation direction) of the transmitted phase data is reversed, and normal transmission in either band is not possible. There is a problem that this is not done.

[0077]

In the conventional multi-band mobile radio, at least one of the settings is made such that when the system communication band to be used is switched, the magnitude relationship between the carrier frequency and the local frequency is switched. There is a problem that communication in the system communication band cannot be performed.

The present invention has been made in order to solve the above-described problem. When the system communication band to be used is switched,
An object of the present invention is to provide a multi-band mobile radio capable of performing normal communication in all selectable system communication bands even when a setting is made such that the magnitude relationship between a carrier frequency and a local frequency is switched. And

[0079]

In order to achieve the above object, a multi-band mobile radio device according to the present invention employs a superheterodyne system and can selectively receive signals in a plurality of system communication bands. In the case where the system communication band to be received is switched, in a multi-band mobile radio device in which the magnitude relationship between the frequency of the RF signal in the system communication band to be received and the frequency of a local signal used for down-conversion of this signal changes, Quadrature demodulation means for performing quadrature demodulation on the received signal to obtain I data and Q data, according to the magnitude relationship between the RF signal in the system communication band to be received, and the frequency of the local signal used for down-conversion of this signal. The I data and the Q data are interchanged and output, or the I data and the Q data are output as they are. And to constitute by comprising a switching means.

In the multi-band mobile radio having the above configuration,
By interchanging and outputting the I signal and the Q signal obtained by the quadrature demodulation in accordance with the system communication band to be received, the quadrature data in which the Q signal is ahead of the I signal by 90 ° is always output to the subsequent data reproducing unit. Output.

Therefore, according to the multi-band mobile radio having the above configuration, the orthogonal data is demodulated in the original phase relationship regardless of which system communication band is used. Can be.

Further, the multi-band mobile radio device according to the present invention employs a superheterodyne system, is capable of selectively receiving signals in a plurality of system communication bands, and switches the system communication band to be received. In a multi-band mobile radio device in which the magnitude relationship between the frequency of an RF signal in a system communication band to be received and the frequency of a local signal used for down-conversion of this signal changes, quadrature demodulation is performed on the received signal to obtain an I signal. And a quadrature demodulation means for obtaining a Q signal; an RF signal in a system communication band to be received;
Data polarity inversion means for inverting and outputting the polarity of the I signal (or Q signal) or outputting the same as it is in accordance with the magnitude relationship with the frequency of the local signal used for down-conversion of this signal. To be configured.

In the multi-band mobile radio having the above configuration,
By inverting the polarity of the I signal (or Q signal) obtained by the quadrature demodulation according to the system communication band to be received, the quadrature data in which the Q signal is ahead of the I signal by 90 ° always reproduces the quadrature data at the subsequent stage. Output to the section.

Therefore, according to the multi-band mobile radio having the above configuration, the orthogonal data is demodulated in the original phase relationship regardless of which system communication band is used. Can be.

Further, the multi-band mobile radio device according to the present invention employs a superheterodyne system, is capable of selectively receiving signals in a plurality of system communication bands, and is provided when the system communication band to be received is switched. In a multi-band mobile radio device in which the magnitude relationship between the frequency of the RF signal in the system communication band to be received and the frequency of the local signal used for down-conversion of this signal changes, the RF signal in the system communication band to be received is converted into the local signal. Frequency conversion means for down-converting to an IF signal using
A tone signal generating means for generating a first tone signal, a second tone signal having the same frequency as this signal and a phase advance of 90 °, an RF signal of a system communication band to be received, and a local signal; Depending on the magnitude relationship with the frequency,
Tone switching means for switching and outputting the first tone signal and the second tone signal, or outputting the first tone signal and the second tone signal as they are, and a second tone signal output from the tone switching means. The IF signal is quadrature-demodulated using one tone signal to obtain a Q signal, and the second tone signal output from the tone switching means is used to transform the IF signal. A second quadrature demodulation means for quadrature demodulation to obtain an I signal is provided.

In the multi-band mobile radio having the above configuration,
2 used for quadrature demodulation according to the system communication band to be received
By interchanging the two tone signals, quadrature data in which the Q signal is ahead of the I signal by 90 ° is always output to the subsequent data reproducing unit.

Therefore, according to the multi-band mobile radio having the above configuration, the orthogonal data is demodulated in the original phase relationship regardless of which system communication band is used. Can be.

Further, the multi-band mobile radio device according to the present invention employs a superheterodyne system, is capable of selectively receiving signals in a plurality of system communication bands, and switches the system communication band to be received. In a multi-band mobile radio device in which the magnitude relationship between the frequency of the RF signal in the system communication band to be received and the frequency of the local signal used for down-conversion of this signal changes, the RF signal in the system communication band to be received is converted into the local signal. Frequency conversion means for down-converting to an IF signal using
A tone signal generating means for generating a first tone signal, a second tone signal having the same frequency as this signal and a phase advance of 90 °, an RF signal of a system communication band to be received, and a local signal; Depending on the magnitude relationship with the frequency,
Tone polarity inverting means for inverting and outputting the polarity of the second tone signal (or the first tone signal), or outputting the tone signal as it is, and the first tone signal (or output from the tone polarity inverting means) Quadrature demodulation means for orthogonally demodulating the IF signal using a first tone signal to obtain a Q signal, and a second tone signal (or tone signal) output from the tone polarity inversion means. A second tone signal which is generated by the generating means) and quadrature-demodulates the IF signal to obtain an I signal.
And a quadrature demodulation means.

In the multi-band mobile radio having the above configuration,
By inverting the phase of one of the two tone signals used for quadrature demodulation and switching the phase relationship between the two tone signals according to the system communication band used, the Q signal always has a 90 ° phase shift from the I signal. The advanced orthogonal data is output to the subsequent data reproducing unit.

Therefore, according to the multi-band mobile radio having the above configuration, the orthogonal data is demodulated in the original phase relationship regardless of which system communication band is used. Can be.

In order to achieve the above object, a multi-band mobile radio device according to the present invention employs a superheterodyne system, is capable of selectively transmitting signals in a plurality of system communication bands, and transmits system signals. When the band is switched, the system communication band to be transmitted is changed in a multi-band mobile radio device in which the magnitude relationship between the frequency of the RF signal of the system communication band to be transmitted and the frequency of the local signal used for up-conversion of this signal changes. Of the RF signal,
Data switching means for switching and outputting an I signal and a Q signal used for quadrature modulation, or outputting the I signal and the Q signal as they are, according to the magnitude relationship with the frequency of a local signal used for up-conversion of the signal. And quadrature modulation means for performing quadrature modulation using the I signal and the Q signal output from the data switching means.

In the multi-band mobile radio having the above configuration,
The polarity of the phase data included in the radio frequency signal is made constant by exchanging the Q signal and the I signal according to the system communication band to be transmitted.

Therefore, according to the multi-band mobile radio having the above configuration, a radio frequency signal including phase data whose polarity does not change can be transmitted regardless of which system communication band is used.

Further, the multi-band mobile radio device according to the present invention employs a superheterodyne system and can selectively transmit signals in a plurality of system communication bands. In a multi-band mobile radio device in which the magnitude relationship between the frequency of the RF signal in the system communication band to be transmitted and the frequency of the local signal used for up-conversion of this signal changes, the RF signal in the system communication band to be transmitted and this signal Depending on the magnitude relationship with the frequency of the local signal used in the up-conversion of I, the polarity of the I signal (or Q signal) of the I signal and the Q signal used for quadrature modulation is inverted or output, or as it is. A data polarity inverting means for outputting, and an I signal output from the data polarity inverting means (or an I signal which has not been inverted). ) And were as above using a Q signal) Q signals (or data inversion means for outputting, to configured by including a quadrature modulation unit for performing quadrature modulation.

In the multi-band mobile radio having the above configuration,
By inverting the phase of one of the orthogonal data according to the system communication band to be transmitted, the polarity of the phase data included in the radio frequency signal is made constant.

Therefore, according to the multi-band mobile radio having the above configuration, it is possible to transmit a radio frequency signal including phase data whose polarity does not change, regardless of which system communication band is used.

Further, the multi-band mobile radio device according to the present invention employs a superheterodyne system, is capable of selectively transmitting signals in a plurality of system communication bands, and switches the system communication band for transmission. In a multi-band mobile radio device in which the magnitude relationship between the frequency of an RF signal in a system communication band to be transmitted and the frequency of a local signal used for up-conversion of this signal changes, the first tone signal, In the same manner, the first signal is generated according to a magnitude relationship between a tone signal generating means for generating a second tone signal whose phase is advanced by 90 °, an RF signal of a system communication band to be transmitted, and a frequency of the local signal. The tone signal and the second tone signal are interchanged and output,
Alternatively, tone switching means for directly outputting the first tone signal and the second tone signal, and first quadrature modulation for orthogonally modulating the first tone signal output from the tone switching means using a Q signal. Means, second quadrature modulating means for quadrature modulating a second tone signal output from the tone switching means using an I signal, output of the first quadrature modulating means and the second quadrature modulation Add the outputs of the means,
A means for generating the RF signal using the result of the addition and the local signal is provided.

In the multi-band mobile radio having the above configuration,
By exchanging the phase relationship between two tone signals used for quadrature modulation according to the system communication band to be transmitted,
The polarity of the phase data included in the radio frequency signal is made constant.

Therefore, according to the multi-band mobile radio having the above configuration, a radio frequency signal including phase data whose polarity does not change can be transmitted regardless of which system communication band is used.

Further, the multi-band mobile radio according to the present invention employs a superheterodyne system, is capable of selectively transmitting signals in a plurality of system communication bands, and switches the system communication band for transmission. In a multi-band mobile radio device in which the magnitude relationship between the frequency of an RF signal in a system communication band to be transmitted and the frequency of a local signal used for up-conversion of this signal changes, the first tone signal, In the same manner, the second signal is generated according to a magnitude relationship between a tone signal generating means for generating a second tone signal whose phase is advanced by 90 °, an RF signal of a system communication band to be transmitted, and a frequency of the local signal. Tone polarity inverting means for inverting and outputting the polarity of the tone signal (or the first tone signal) of A first quadrature demodulator for quadrature demodulating the tone signal (or the first tone signal output from the tone polarity inverting means) using a Q signal, and a second tone output from the tone polarity inverting means. A second quadrature demodulator for quadrature-modulating a signal (or a second tone signal as generated by the tone signal generator) using the I signal; an output of the first quadrature modulator; 2
And the means for generating the RF signal using the result of the addition and the local signal.

In the multi-band mobile radio having the above configuration,
The phase of one of the two tone signals used for the quadrature modulation is inverted according to the system communication band to be transmitted, so that the polarity of the phase data included in the radio frequency signal is made constant.

Therefore, according to the multi-band mobile radio having the above configuration, a radio frequency signal including phase data whose polarity does not change can be transmitted regardless of which system communication band is used.

The multi-band mobile radio device according to the present invention employs a superheterodyne system, and can selectively transmit signals in a plurality of system communication bands. In a multi-band mobile radio device in which the magnitude relationship between the frequency of the RF signal in the system communication band to be transmitted and the frequency of the local signal used for up-conversion of this signal changes, the RF signal in the system communication band to be transmitted and this signal Depending on the magnitude relationship with the frequency of the local signal used for up-conversion, the polarity of the baseband signal is inverted and output,
Alternatively, a polarity inversion unit that outputs the signal as it is, a quadrature data generation unit that generates an I signal and a Q signal when used for quadrature modulation from the baseband signal output from the polarity inversion unit, and a quadrature data generation unit And quadrature modulation means for performing quadrature modulation using the I signal and the Q signal.

In the multi-band mobile radio having the above configuration,
By inverting the polarity of the baseband signal in accordance with the system communication band to be transmitted, the polarity of the phase data included in the radio frequency signal is made constant.

Therefore, according to the multi-band mobile radio having the above configuration, a radio frequency signal including phase data whose polarity does not change can be transmitted regardless of which system communication band is used.

[0106]

Embodiments of the present invention will be described below with reference to the drawings. First, a case where the present invention is applied to a receiving system of a multi-band mobile wireless device will be described.

FIG. 1 shows a configuration of a receiving system of a multi-band mobile radio apparatus according to a first embodiment of the present invention. In addition to the configuration of the conventional receiving system shown in FIG. 101 is provided.

R received from the base station by the preceding antenna
The F signal is mixed by the mixer 14 with the local signal generated by the local oscillator 31 and then mixed with the filter 1.
5 is input.

The frequency of the local signal of the local oscillator 31 is set between, for example, two system communication bands as shown in FIG. 20. When the system communication band to be used is switched, the carrier frequency and the local signal are changed. The magnitude relationship between the frequencies is switched.

The filter 15 removes the high-frequency component from the output of the mixer 14 and outputs only the IF signal that is the down-converted low-frequency component. This IF signal is amplified by the IF amplifier 16, divided into two, and input to the mixers 172 and 174, respectively.

In the mixer 172, the input IF signal is mixed with the tone signal generated by the oscillation circuit 171 and then input to the filter 173. Filter 173 performs filtering on the output of mixer 172. By this filtering, only the baseband signal, which is a down-converted low-frequency component, is extracted and output to the switching circuit 101.

On the other hand, the mixer 174 has an oscillator 1711
The phase of the tone signal generated by the phase shifter 1712 is advanced by 90 ° and input. And the mixer 174
Mixes the tone signal and the IF signal from the IF amplifier 16 and inputs the signal to the filter 175.

The filter 175 filters the output of the mixer 174. By this filtering, only the baseband signal, which is a down-converted low-frequency component, is extracted and output to the switching circuit 101.

Filter 1 input to switching circuit 101
The baseband signal from the switch 73 is divided into two, and the first input terminal of the switch 1011 and the switch 10
Twelve second input terminals are input.

Similarly, the baseband signal input from the filter 175 to the switching circuit 101 is divided into two, and the signals are respectively supplied to the second input terminal of the changeover switch 1011 and the first input terminal of the changeover switch 1012. Is entered.

The changeover switches 1011 and 1012 are controlled by the control unit C1 to selectively output one of the signals input to the first input terminal and the second input terminal. Then, the quadrature data in which the output of the changeover switch 1011 is used as a Q signal and the output of the changeover switch 1012 is used as an I signal is output to a subsequent data reproducing unit (not shown).

The control unit C1 is an integrated circuit such as a CPU, and controls the frequency of a signal generated by the local oscillator 31 or the oscillation circuit 171 to give an instruction to each unit of the multi-band wireless device to perform normal communication. In addition to the control function related to the above, a new control function is provided for switching the changeover switches 1011 and 1012 in accordance with the system communication band to be used.

Next, the receiving operation of the multi-band radio having the above configuration will be described. The control unit C1 is a DCS 180
0, that is, when the frequency of the local signal generated by the local oscillator 31 is lower than the carrier frequency, the changeover switch 1011 and the changeover switch 1
012 is instructed to output a signal input to the first input terminal as a tone signal.

According to this, as described in the section of the prior art, Grcos (φi (t)) is output from the filter 173, which is a Q signal, and Grsin (φi (t)) is output from the filter 175. Is output, and this is an I signal.

On the other hand, when GSM900 is used, that is, when the frequency of the local signal generated by local oscillator 31 is higher than the carrier frequency, control unit C1
Are the changeover switch 1051 and the changeover switch 1052
Is instructed to output a signal input to the second input terminal as a tone signal.

According to this, as described in the section of the prior art, the filter 173 outputs Grcos (φi (t)), and the filter 175 outputs −Gr sin (φi (t)). However, these baseband signals are
-Gr sin (φi (t)) as the Q signal
Is output, and Gr cos (φi (t)) is output as an I signal, so that quadrature data in which the Q signal is ahead of the I signal by 90 ° can be obtained.

As described above, in the multi-band radio equipped with the receiving system having the above-described configuration, as described in the section of the related art, the carrier frequency and the local oscillator 31 according to the system communication band to be used. , The phase relationship between the two signals obtained by the mixers 173 and 175 is switched, but the outputs of the mixers 173 and 175 are changed according to the system communication band to be used. Switching circuit 10
By switching and outputting at 1, the Q signal is always I
The quadrature data whose phase is advanced by 90 ° with respect to the signal is output to the data reproducing unit at the subsequent stage.

Therefore, according to the multi-band radio equipped with the receiving system having the above configuration, the orthogonal data is demodulated in the original phase relationship regardless of which system communication band is used. Reception can be performed.

Next, a receiving system of a multi-band mobile radio according to a second embodiment of the present invention will be described with reference to FIG. FIG. 2 shows the configuration. The receiving system shown in this figure is different from the configuration of the receiving system shown in FIG. 1 in that a switching circuit 102 is provided instead of the switching circuit 101. Therefore, the switching circuit 102 will be mainly described.

The filter 173 filters the output of the mixer 172, extracts only the baseband signal which is a low-frequency component down-converted by the filtering, and outputs the baseband signal to the switching circuit 102.

On the other hand, the filter 175 filters the output of the mixer 174, extracts only the baseband signal which is a low-frequency component down-converted by this filtering, and outputs it to the switching circuit 102.

The switching circuit 102 includes an inverting amplifier 1021
And a changeover switch 1022. Filter 17
3 is output as it is as a Q signal to a data reproducing unit at the subsequent stage.
75, the baseband signal obtained by the inverting amplifier 10
21 is input to the first input terminal of the changeover switch 1022.

The inverting amplifier 1021 inverts the phase of the input baseband signal and inputs the inverted signal to the second input terminal of the switch 1022. The changeover switch 1022 is
In response to a control signal from the control unit C2, one of a signal input to the first input terminal and a signal input to the second input terminal is selected, and is selected as an I signal for the subsequent data reproduction unit. Output.

The control unit C2, like the control unit C1, has a control function related to normal communication, and also has a function of switching the changeover switch 1022 according to the system communication band to be used.

Next, the receiving operation of the multiband radio having the above configuration will be described. The control unit C2 is a DCS 180
When 0 is used, that is, when the frequency of the local signal generated by the local oscillator 31 is lower than the carrier frequency, a signal input to the first input terminal is output to the changeover switch 1022 as an I signal. Give instructions to let

According to this, as described in the section of prior art, Grcos (φi (t)) from the filter 173 is output as a Q signal, and Gr sin (φi (t)) from the filter 175 is output.
(φi (t)) is output as an I signal.

On the other hand, when GSM900 is used, that is, when the frequency of the local signal generated by local oscillator 31 is higher than the carrier frequency, control unit C2
Instructs the changeover switch 1022 to output a signal input to the second input terminal as an I signal.

According to this, as described in the section of the prior art, the Grcos (φi (t)) from the filter 173 is output as the Q signal, and the -Gr si from the filter 175 is output.
n (φi (t)) is inverted to Gr sin (φi (t)),
Quadrature data is output as an I signal, and the Q signal is 90 ° ahead of the I signal in phase.

As described above, in the multi-band radio equipped with the receiving system having the above configuration, the switching circuit 102 inverts the phase of the base band signal extracted by the filter 175 according to the system communication band to be used. Therefore, quadrature data in which the Q signal is ahead of the I signal by 90 ° always is output to the subsequent data reproducing unit, and normal reception can be performed.

Next, a receiving system of a multi-band mobile radio apparatus according to a third embodiment of the present invention will be described with reference to FIG. FIG. 3 shows the configuration. The receiving system shown in this figure is different from the configuration of the receiving system shown in FIG. 2 in that a switching circuit 103 is provided instead of the switching circuit 102. Therefore, the switching circuit 103 will be mainly described.

Switching circuit 103, like switching circuit 102, inverts the phase of the baseband signal obtained by one of the filters.
In contrast to the above, the switching circuit 103 inverts the phase of the baseband signal obtained by the filter 173 in response to an instruction from the control unit C3.

The switching circuit 103 includes an inverting amplifier 1031
And a changeover switch 1032. Filter 17
5 is output as it is as an I signal to a subsequent data reproducing unit.
73. The baseband signal obtained by
31 and a first input terminal of the changeover switch 1032.

The inverting amplifier 1031 inverts the phase of the input baseband signal and inputs the inverted signal to the second input terminal of the changeover switch 1032. The changeover switch 1032 is
In response to a control signal from the control unit C3, one of a signal input to the first input terminal and a signal input to the second input terminal is selected, and is selected as a Q signal for the subsequent data reproduction unit. Output.

The control section C3, like the control section C1, has a function of controlling the changeover switch 1032 in accordance with a system communication band to be used, in addition to having a control function relating to normal communication.

Next, the receiving operation of the multiband radio having the above configuration will be described. The control unit C2 is a DCS 180
When 0 is used, that is, when the frequency of the local signal generated by the local oscillator 31 is lower than the carrier frequency, a signal input to the first input terminal is output to the changeover switch 1032 as a Q signal. Give instructions to let

According to this, as described in the background section, Grcos (φi (t)) from the filter 173 is output as a Q signal, and Gr sin (φi (t)) from the filter 175 is output.
(φi (t)) is output as an I signal.

On the other hand, when GSM900 is used, that is, when the frequency of the local signal generated by local oscillator 31 is higher than the carrier frequency, control unit C3
Instructs the changeover switch 1032 to output a signal input to the second input terminal as a Q signal.

According to this, as described in the section of the prior art, Grcos (φi (t)) from the filter 173 is inverted to −Gr cos (φi (t)) and output as a Q signal. -Gr sin (φi (t)) from the filter 175
Is output as an I signal, and quadrature data in which the Q signal is ahead of the I signal by 90 ° is obtained.

As described above, since the switching circuit 103 inverts the phase of the baseband signal extracted by the filter 173 in accordance with the system communication band to be used, the Q signal is always higher than the I signal. The quadrature data whose phase is advanced by 90 ° is output to the data reproducing unit at the subsequent stage, so that normal reception can be performed.

Next, a receiving system of a multi-band mobile radio apparatus according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 4 shows the configuration. The receiving system shown in this figure has a tone phase switching circuit 1 in addition to the oscillation circuit 171 in the configuration of the conventional receiving system shown in FIG.
04 is newly provided.

R received from the base station by the previous antenna
The F signal is mixed by the mixer 14 with the local signal generated by the local oscillator 31 and then mixed with the filter 1.
5 is input.

The filter 15 removes the high-frequency component from the output of the mixer 14 and outputs only the IF signal that is the down-converted low-frequency component. This IF signal is amplified by the IF amplifier 16, divided into two, and input to the mixers 172 and 174, respectively.

The tone signal generated by the oscillator 1711 of the oscillation circuit 171 is divided into two, one of which is directly input to the tone phase switching circuit 104, and the other is advanced by 90 ° in the phase shifter 1712. Thereafter, it is input to the tone phase switching circuit 104.

The tone phase switching circuit 104 includes changeover switches 1041 and 1042, and the outputs of both switches are controlled by a control unit C4 described later. A tone signal generated by the oscillator 1711 is directly input to a first input terminal of the changeover switch 1041, and a tone signal advanced by 90 ° in the phase shifter 1712 is input to a second input terminal. Then, the changeover switch 1041 inputs one input signal to the mixer 172 according to a control signal from a control unit C4 described later.

The tone signal whose phase has been advanced by 90 ° by the phase shifter 1712 is input to the first input terminal of the changeover switch 1042, and the oscillator 17 is input to the second input terminal.
The tone signal generated in 11 is directly input, and the changeover switch 1042 inputs one input signal to the mixer 174 according to a control signal from a control unit C4 described later.

Like the control unit C1, the control unit C4 has not only a control function related to normal communication but also changeover switches 1041 and 1042 according to a system communication band to be used.
Is provided with a function of switching control.

Next, the receiving operation of the multiband radio having the above configuration will be described. The control unit C4 is a DCS 180
When 0 is used, that is, when the frequency of the local signal generated by the local oscillator 31 is lower than the carrier frequency, the signals input to the first input terminals to the changeover switches 1041 and 1042 are changed to tone signals. As output.

According to this, as described in the section of the prior art, Grcos (φi (t)) is obtained by the filter 173 and output as a Q signal, and Grsin (φi (t)) is output from the filter 175. Is obtained and output as an I signal.

On the other hand, when GSM900 is used, that is, when the frequency of the local signal generated by local oscillator 31 is higher than the carrier frequency, control unit C4
Instructs the changeover switches 1041 and 1042 to output a signal input to the second input terminal as a tone signal.

According to this, the filter 173 outputs -G
r sin (φi (t)) is obtained and output as a Q signal. From the filter 175, Gr cos (φi (t)) is obtained and output as an I signal. Quadrature data with advanced phase is obtained.

As described above, in the multi-band radio equipped with the receiving system having the above-described configuration, the mixers 173 and 175 use two orthogonal tone signals to separate two orthogonal baseband signals from the IF signal. , And 2 input to the mixers 173 and 175
By switching the two tone signals according to the system communication band used, the Q signal is always 90 times faster than the I signal.
(4) The quadrature data whose phase is advanced is output to the data reproducing unit at the subsequent stage.

Therefore, according to the multi-band radio equipped with the receiving system having the above configuration, the orthogonal data is demodulated in a desired phase relationship regardless of which system communication band is used. Reception can be performed.

Next, with reference to FIG. 5, a receiving system of a multi-band mobile radio according to a fifth embodiment of the present invention will be described. FIG. 5 shows the configuration. The receiving system shown in this figure has a tone phase switching circuit 1 in addition to the oscillation circuit 171 in the configuration of the conventional receiving system shown in FIG.
05 is newly provided.

The R received from the base station by the preceding antenna
The F signal is mixed by the mixer 14 with the local signal generated by the local oscillator 31 and then mixed with the filter 1.
5 is input.

The filter 15 removes the high-frequency component from the output of the mixer 14 and outputs only the IF signal that is the down-converted low-frequency component. This IF signal is amplified by the IF amplifier 16, divided into two, and input to the mixers 172 and 174, respectively.

The tone signal generated by the oscillator 1711 of the oscillation circuit 171 is divided into two, one of which is directly input to the mixer 172, and the other of which is advanced by 90 ° in the phase shifter 1712 and then the tone phase is shifted. Switching circuit 105
Is input to

The tone phase switching circuit 105 includes an inverting amplifier 1051 and a changeover switch 1052. Phase shifter 1
The tone signal advanced by 90 ° in 712 is input to the inverting amplifier 1051 and the first input terminal of the changeover switch 1052. The inverting amplifier 1051 includes a phase shifter 171
2 and inverts the phase of the tone signal input from the second switch 1052 to the second input terminal.

The changeover switch 1052 is connected to a control unit C described later.
The switching control is performed by the control signal from the first input terminal 5 and one of the signals input to the first input terminal and the second input terminal is selectively input to the mixer 174.

The control unit C5, like the control unit C1, has a control function related to normal communication, and also has a function of switching the changeover switch 1052 according to the system communication band to be used.

In mixer 172, the input IF signal is mixed with the tone signal input from oscillation circuit 171, and then input to filter 173. The filter 173 performs filtering on the output of the mixer 172, extracts only the baseband signal that is the down-converted low-frequency component by this filtering, and outputs the baseband signal to the data reproducing unit at the subsequent stage.

On the other hand, mixer 174 has IF amplifier 16
Is mixed with the tone signal input from the tone phase switching circuit 104 and input to the filter 175.

The filter 175 filters the output of the mixer 174, extracts only the baseband signal which is a down-converted low-frequency component by this filtering, and outputs the baseband signal to the data reproducing unit at the subsequent stage.

Next, the receiving operation of the multiband radio having the above configuration will be described. The control unit C5 includes the DCS 180
When 0 is used, that is, when the frequency of the local signal generated by the local oscillator 31 is lower than the carrier frequency, the signal input to the first input terminal is output to the changeover switch 1052 as a tone signal. Give instructions to do so.

According to this, as described in the section of the prior art, the filter 173 outputs Grcos (φi (t)), which becomes a Q signal, and the filter 175 outputs Grsin (φi (t)). Is output, and this is an I signal.

On the other hand, when GSM900 is used, that is, when the frequency of the local signal generated by local oscillator 31 is higher than the carrier frequency, control unit C5
Instructs the changeover switch 1052 to output a signal input to the second input terminal as a tone signal.

According to this, as described in the section of the related art, the filter 173 outputs Grcos (φi (t)). The output of the mixer 174 is as shown in the following equation.

[0172]

(Equation 23)

Further, from ωc−ωL = −ωIF, the output of the filter 175 is as follows.

[0174]

(Equation 24)

Since the second term in the above equation is removed by the filter 175, the output of the filter 175 is Gr sin (φ
i (t)). Therefore, Gr cos (φi
(t)) and Gr sin (φi (t)) is output as the I signal.

As described above, in the multi-band radio equipped with the receiving system having the above-described configuration, mixers 172 and 174 use two orthogonal tone signals to separate two orthogonal baseband signals from the IF signal. Is obtained according to the system communication band to be used.
The phase relationship between the tone signals input to the two mixers 172 and 174 is switched by inverting the phase of the tone signal input to 74.

Therefore, according to the multi-band radio equipped with the receiving system having the above configuration, the orthogonal data is demodulated in a desired phase relationship regardless of which system communication band is used. Reception can be performed.

Next, a receiving system of a multi-band mobile radio according to a sixth embodiment of the present invention will be described with reference to FIG. FIG. 6 shows the configuration. The receiving system shown in this figure has a tone phase switching circuit 1 in addition to the oscillation circuit 171 in the configuration of the conventional receiving system shown in FIG.
06 is newly provided.

The R received from the base station by the preceding antenna
The F signal is mixed by the mixer 14 with the local signal generated by the local oscillator 31 and then mixed with the filter 1.
5 is input.

The filter 15 removes the high-frequency component from the output of the mixer 14 and outputs only the IF signal that is the down-converted low-frequency component. This IF signal is amplified by the IF amplifier 16, divided into two, and input to the mixers 172 and 174, respectively.

The tone signal generated by the oscillator 1711 of the oscillation circuit 171 is divided into two, one of which is input to the tone phase switching circuit 106 and the other is the phase shifter 1712
The phase is advanced by 90 ° and input to the mixer 174.

The tone phase switching circuit 106 includes an inverting amplifier 1061 and a changeover switch 1062. Oscillator 1
The tone signal generated in 711 is output to the inverting amplifier 1061
Is input to the first input terminal of the changeover switch 1062. The inverting amplifier 1061 inverts the phase of the tone signal input from the oscillator 1711 and
2 to the second input terminal.

The changeover switch 1062 is connected to a control unit C described later.
6 is selectively controlled by the control signal from the first input terminal and one of the signals input to the first input terminal and the second input terminal.

The control unit C6, like the control unit C1, has a control function related to normal communication, and also has a function of controlling switching of the changeover switch 1062 according to a system communication band to be used.

In mixer 172, the input IF signal is mixed with the tone signal input from tone phase switching circuit 106, and then input to filter 173. The filter 173 performs filtering on the output of the mixer 172, and by this filtering,
Only the baseband signal, which is a down-converted low-frequency component, is extracted and output to the data reproducing unit at the subsequent stage.

On the other hand, mixer 174 includes IF amplifier 16
Is mixed with the tone signal input from the oscillation circuit 171 and input to the filter 175.
The filter 175 filters the output of the mixer 174, extracts only the baseband signal that is the down-converted low-frequency component by this filtering, and outputs the baseband signal to the subsequent data reproducing unit.

Next, the receiving operation of the multiband radio having the above configuration will be described. The control unit C6 is a DCS 180
When 0 is used, that is, when the frequency of the local signal generated by the local oscillator 31 is lower than the carrier frequency, the signal input to the first input terminal is output to the changeover switch 1052 as a tone signal. Give instructions to do so.

According to this, as described in the section of the prior art, Grcos (φi (t)) is output from the filter 173 and becomes a Q signal, and Grsin (φi (t)) is output from the filter 175. Is output, and this is an I signal.

On the other hand, when GSM900 is used, that is, when the frequency of the local signal generated by local oscillator 31 is higher than the carrier frequency, control unit C4
Instructs the changeover switch 1052 to output a signal input to the second input terminal as a tone signal.

According to this, the output of the mixer 172 is as shown in the following equation.

[0191]

(Equation 25)

Further, from ωc−ωL = −ωIF, the output of the filter 173 is as follows.

[0193]

(Equation 26)

Since the second term in the above equation is removed by the filter 175, the output of the filter 173 is −G r cos
(φi (t)). Then, the filter 175 outputs -Gr sin (φi (t)) as described in the section of the related art.

Therefore, -G cos (φi
(t)) is output, and -Gr sin (φi (t)) is output as an I signal, so that quadrature data in which the Q signal is ahead of the I signal by 90 ° is obtained.

As described above, in the multi-band radio equipped with the receiving system having the above configuration, the mixers 172 and 174 use the two orthogonal baseband signals from the IF signal using the two orthogonal tone signals, respectively. Is obtained according to the system communication band to be used.
The phase relationship between the tone signals input to the two mixers 172 and 174 is switched by inverting the phase of the tone signal input to the 72.

Therefore, according to the multi-band radio equipped with the receiving system having the above configuration, the orthogonal data is demodulated in a desired phase relationship regardless of which system communication band is used. Reception can be performed.

Next, a case where the present invention is applied to a transmission system of a multi-band mobile radio will be described. FIG. 7 shows a configuration of a transmission system of a multi-band mobile radio according to a seventh embodiment of the present invention. In addition to the configuration of the conventional transmission system shown in FIG. It is a thing.

The orthogonal data input from a data generator (not shown) is input to the switching circuit 201. Switching circuit 20
1 is a changeover switch 2011 and a changeover switch 2012
Consists of

[0200] Of the orthogonal data input to the switching circuit 201, the Q signal is divided into two, input to the first input terminal of the changeover switch 2011 and the second input terminal of the changeover switch 2012, and Distributed and changeover switch 2
011 and a second input terminal of the changeover switch 2012.
Input terminal.

The changeover switch 2011 is connected to a control unit C described later.
7 is selectively controlled by one of the signals input to the first input terminal and the second input terminal.
Input to 82.

Similarly, the changeover switch 2012 is switch-controlled by the control section C7, and selectively inputs one of the signals input to the first input terminal and the second input terminal to the mixer 283.

The oscillation circuit 281 includes an oscillator 2811 and a phase shifter 2812 (π / 2). The tone signal generated by the oscillator 2811 is divided into two,
And the phase shifter 2812. Phase shifter 28
The reference numeral 12 advances the phase of the tone signal input from the oscillator 2811 by 90 ° and inputs the signal to the mixer 383. Mixer 28
2 mixes one of the orthogonal data input from the changeover switch 2011 with the tone signal input from the oscillator 2811, and inputs the result to the adder 284.

A mixer 283 mixes one of the orthogonal data input from the changeover switch 2012 with the tone signal input from the phase shifter 2812, and
Enter 4

The adder 284 includes the mixer 282 and the mixer 2
The signals input from 83 are added. The result of this addition is
After being amplified at a predetermined gain by the IF amplifier 27, the intermediate frequency signal filtered by the filter 26 and phase-modulated is input to the mixer 25.

The mixer 25 mixes the IF signal from the filter 26 with the local signal generated by the local oscillator 31. Then, the result of the mixing is input to the filter 24, whereby the image signal is removed, and a desired radio frequency signal is output.

The control section C7 is an integrated circuit such as a CPU, and controls the frequency of a signal generated by the local oscillator 31 or the oscillator 2811 to give an instruction to each section of the multi-band radio to perform normal communication. In addition to having a related control function, a new control function is provided for switching the changeover switches 2011 and 2012 according to the system communication band to be used.

Next, the transmission operation of the multiband radio having the above configuration will be described. The control unit C7 includes the DCS 180
0, that is, when the frequency of the local signal generated by the local oscillator 31 is lower than the carrier frequency, the changeover switch 2011 and the changeover switch 2
012 is instructed to output the orthogonal data input to the first input terminal.

According to this, as described in the section of the prior art, the output of the mixer 25 is represented by the equation (24). Then, the second item of Expression (24) is attenuated by the filter 24, and a radio frequency signal represented by the following expression is obtained. At this time, the angular frequency ωc = ωL + ωIF, and the sign of the phase data is positive.

[0210]

[Equation 27]

On the other hand, when GSM900 is used, that is, when the frequency of the local signal generated by local oscillator 31 is higher than the carrier frequency, control unit C7
Are changeover switches 2011 and 2012
Is instructed to output orthogonal data input to the second input terminal.

According to this, the outputs of the mixers 282 and 283 become intermediate frequency signals represented by the following equations.

[0213]

[Equation 28]

The output of the adder 284 obtained by adding them is expressed by the following equation.

[0215]

(Equation 29)

Therefore, the output of the mixer 25 is as follows.

[0219]

[Equation 30]

The second item in the above equation is attenuated by the filter 24, and the first item is obtained as a radio frequency signal. At this time, the angular frequency is ωc = ωL−ωIF,
The sign of the phase data is positive.

As described above, in the multiband radio having the transmission system of the above configuration, a switching circuit 201 is newly provided, and the Q signal and the I signal are switched according to the system communication band to be used. The polarity of the phase data included in the radio frequency signal is made constant.

Therefore, according to the multi-band radio having the transmission system of the above configuration, a radio frequency signal including phase data whose polarity does not change can be transmitted regardless of which system communication band is used. .

FIG. 8 shows the configuration of the transmission system of a multi-band mobile radio apparatus according to the eighth embodiment of the present invention. The transmission system shown in this figure includes a switching circuit 202 instead of the switching circuit 201 of the transmission system shown in FIG. 7, and the following description will focus on different parts.

The orthogonal data input from a data generator (not shown) is input to the switching circuit 202. Switching circuit 20
2 comprises an inverting amplifier 2021 and a changeover switch 2022.

Of the orthogonal data input to the switching circuit 201, the Q signal is input to the mixer 282 as it is. On the other hand, the I signal is split into two and input to the inverting amplifier 2021 and the first input terminal of the changeover switch 2022.

The inverting amplifier 2021 inverts the phase of the input I signal and inputs it to the second input terminal of the changeover switch 2022. The changeover switch 2022 is switch-controlled by a control unit C8 described later, and selectively inputs one of the signals input to the first input terminal and the second input terminal to the mixer 283.

The control unit C8, like the control unit C7, has a control function related to normal communication and, as a new control function, a function of switching the changeover switch 2022 according to the system communication band to be used. It has.

Next, the transmission operation of the multiband radio having the above configuration will be described. The control unit C8 is a DCS180
When 0 is used, that is, when the frequency of the local signal generated by the local oscillator 31 is lower than the carrier frequency, the changeover switch 2022 outputs quadrature data input to the first input terminal. Give instructions.

According to this, as described in the section of the prior art, the output of the mixer 25 is expressed by the equation (24). Then, the second item of Expression (24) is attenuated by the filter 24, and a radio frequency signal represented by the following expression is obtained. At this time, the angular frequency ωc = ωL + ωIF, and the sign of the phase data is positive.

[0228]

(Equation 31)

On the other hand, when GSM900 is used, that is, when the frequency of the local signal generated by local oscillator 31 is higher than the carrier frequency, control unit C8
Gives an instruction to the changeover switch 2022 to output quadrature data whose phase is inverted, which is input to the second input terminal.

According to this, the output of the mixer 283 becomes an intermediate frequency signal represented by the following equation.

[0231]

(Equation 32)

The output of the mixer 282 is an intermediate frequency signal represented by the following equation.

[0233]

[Equation 33]

The output of the adder 284 obtained by adding them is expressed by the following equation.

[0235]

(Equation 34)

Therefore, the output of the mixer 25 is as follows.

[0237]

(Equation 35)

Then, the first item of the above equation is attenuated by the filter 24, and the second item is obtained as a radio frequency signal. At this time, the angular frequency is ωc = ωL−ωIF,
The sign of the phase data is positive.

As described above, in the multi-band radio having the transmission system having the above-described configuration, the switching circuit 202 is newly provided to invert the phase of the I signal according to the system communication band to be used. The polarity of the phase data included in the radio frequency signal is made constant.

Therefore, according to the multi-band radio equipped with the transmission system having the above configuration, it is possible to transmit a radio frequency signal including phase data whose polarity does not change, regardless of which system communication band is used. .

FIG. 9 shows a configuration of a transmission system of a multi-band mobile radio apparatus according to a ninth embodiment of the present invention. The transmission system shown in this figure includes a switching circuit 203 instead of the switching circuit 201 of the transmission system shown in FIG. 7, and the following description will focus on different parts.

The orthogonal data input from a data generator (not shown) is input to the switching circuit 203. Switching circuit 20
3 includes an inverting amplifier 2031 and a changeover switch 2032.

Of the orthogonal data input to the switching circuit 201, the Q signal is split into two and input to the inverting amplifier 2031 and the first input terminal of the switch 2032. On the other hand, the I signal is directly input to the mixer 283.

The inverting amplifier 2031 inverts the phase of the input Q signal and inputs it to the second input terminal of the changeover switch 2032. The changeover switch 2032 is switch-controlled by a control unit C <b> 9 described later, and selectively inputs one of the signals input to the first input terminal and the second input terminal to the mixer 282.

The control unit C9, like the control unit C7, has a control function related to normal communication and, as a new control function, a function of switching the changeover switch 2032 in accordance with the system communication band to be used. It has.

Next, the transmission operation of the multiband radio having the above configuration will be described. The control unit C9 includes the DCS 180
When 0 is used, that is, when the frequency of the local signal generated by the local oscillator 31 is lower than the carrier frequency, the changeover switch 2022 outputs quadrature data input to the first input terminal. Give instructions.

According to this, as described in the section of the prior art, the output of the mixer 25 is represented by the equation (24). Then, the second item of Expression (24) is attenuated by the filter 24, and a radio frequency signal represented by the following expression is obtained. At this time, the angular frequency ωc = ωL + ωIF, and the sign of the phase data is positive.

[0248]

[Equation 36]

On the other hand, when GSM900 is used, that is, when the frequency of the local signal generated by local oscillator 31 is higher than the carrier frequency, control unit C9
Instructs the changeover switch 2032 to output the phase-inverted quadrature data input to the second input terminal.

According to this, the output of the mixer 282 is an intermediate frequency signal represented by the following equation.

[0251]

(37)

The output of the mixer 283 is an intermediate frequency signal represented by the following equation.

[0253]

(38)

The output of the adder 284 obtained by adding them is expressed by the following equation.

[0255]

[Equation 39]

Therefore, the output of the mixer 25 is as follows.

[0257]

(Equation 40)

The filter 24 attenuates the second item in the above equation, and the first item is obtained as a radio frequency signal. At this time, the angular frequency is ωc = ωL−ωIF,
The sign of the phase data is positive.

As described above, in the multi-band radio having the transmission system of the above configuration, a switching circuit 203 is newly provided, and the phase of the Q signal is inverted according to the system communication band to be used. The polarity of the phase data included in the radio frequency signal is made constant.

Therefore, according to the multi-band radio equipped with the transmission system having the above configuration, it is possible to transmit a radio frequency signal including phase data whose polarity does not change, regardless of which system communication band is used. .

FIG. 10 shows the configuration of the transmission system of a multi-band mobile radio apparatus according to the tenth embodiment of the present invention. The transmission system of the multi-band mobile radio shown in this figure includes a new switching circuit 204 in addition to the configuration of the conventional transmission system shown in FIG. 23. In the following description, different parts will be mainly described. I do. Of the quadrature data input from a data generator (not shown), the Q signal is
, While the I signal is input to mixer 283.

The tone signal generated by the oscillator 2811 of the oscillation circuit 281 is divided into two, one of which is directly input to the tone phase switching circuit 204, and the other is advanced by 90 ° in the phase shifter 2812. Thereafter, it is input to the tone phase switching circuit 204.

The tone phase switching circuit 204 includes changeover switches 2041 and 2042, and the outputs of both switches are controlled by a control unit C10 described later. The tone signal generated by the oscillator 2811 is directly input to the first input terminal of the changeover switch 2041, and the tone signal advanced by 90 ° in the phase shifter 2812 is input to the second input terminal. Then, the changeover switch 2041 inputs one input signal to the mixer 282 according to a control signal from a control unit C10 described later.

A tone signal whose phase has been advanced by 90 ° by the phase shifter 2812 is input to a first input terminal of the changeover switch 2042, and an oscillator 28 is input to a second input terminal.
The tone signal generated at 11 is directly input, and the changeover switch 2042 inputs one input signal to the mixer 284 according to a control signal from a control unit C10 described later.

The control unit C10, like the control unit C7, has a control function related to normal communication and, as a new control function, controls the changeover switches 2041 and 2042 according to the system communication band to be used. It has the function to do.

Next, the transmission operation of the multi-band radio having the above configuration will be described. The control unit C10 includes a DCS 18
When 00 is used, that is, when the frequency of the local signal generated by the local oscillator 31 is lower than the carrier frequency, a tone signal input to the first input terminal is output to the changeover switch 2041. To the changeover switch 2042 so as to output a tone signal whose phase is advanced by 90 °, which is input to the first input terminal.

According to this, as described in the section of the prior art, the output of the mixer 25 is expressed by the equation (24). Then, the second item of Expression (24) is attenuated by the filter 24, and a radio frequency signal represented by the following expression is obtained. At this time, the angular frequency ωc = ωL + ωIF, and the sign of the phase data is positive.

[0268]

[Equation 41]

On the other hand, when GSM900 is used, that is, when the frequency of the local signal generated by local oscillator 31 is higher than the carrier frequency, control unit C10
Gives an instruction to the changeover switch 2041 to output a tone signal whose phase is advanced by 90 °, which is input to the second input terminal.
An instruction is issued to output a tone signal input to the second input terminal.

According to this, the outputs of the mixers 282 and 283 are intermediate frequency signals represented by the following equations.

[0271]

(Equation 42)

The output of the adder 284 obtained by adding them is expressed by the following equation.

[0273]

[Equation 43]

Therefore, the output of the mixer 25 is as follows.

[0275]

[Equation 44]

The filter 24 attenuates the second item in the above equation, and the first item is obtained as a radio frequency signal.
At this time, the angular frequency is ωc = ωL−ωIF, and the sign of the phase data is positive.

As described above, in the multi-band radio having the transmission system having the above-described configuration, the tone phase switching circuit 204 is newly provided, and the tone phase switching circuit 204 is provided according to the system communication band to be used.
By exchanging the phase relationship between the tone signals input to the two mixers 282 and 283, the polarity of the phase data included in the radio frequency signal is made constant.

Therefore, according to the multi-band radio equipped with the transmission system having the above configuration, a radio frequency signal including phase data whose polarity does not change can be transmitted regardless of which system communication band is used. .

FIG. 11 shows a configuration of a transmission system of a multi-band mobile radio apparatus according to an eleventh embodiment of the present invention. The transmission system of the multi-band mobile radio shown in this figure includes a new switching circuit 205 in addition to the configuration of the conventional transmission system shown in FIG. 23. In the following description, different parts will be mainly described. I do. Of the quadrature data input from a data generator (not shown), the Q signal is
, While the I signal is input to mixer 283.

The tone signal generated by the oscillator 2811 of the oscillation circuit 281 is divided into two, one of which is directly input to the mixer 282, and the other of which is advanced by 90 ° in the phase shifter 2812 and then the tone phase is shifted. Switching circuit 205
Is input to

The tone phase switching circuit 205 comprises an inverting amplifier 2051 and a changeover switch 2052. The tone signal advanced in phase by 90 ° by the phase shifter 2812 is input to the inverting amplifier 2051 and the first input terminal of the changeover switch 2052. The inverting amplifier 2051 is connected to the phase shifter 28.
Invert the phase of the tone signal input from the switch 12 and input it to the second input terminal of the changeover switch 2052.

The changeover switch 2052 is connected to a control unit C described later.
The switching is controlled by the control signal from the controller 11, and one of the signals input to the first input terminal and the second input terminal is selectively input to the mixer 283.

[0283] The control unit C11 has a control function related to normal communication, similar to the control unit C7, and has a new control function of switching and controlling the changeover switch 2052 according to the system communication band to be used. It has.

Next, the transmission operation of the multiband radio having the above configuration will be described. The control unit C11 includes a DCS 18
When 00 is used, that is, when the frequency of the local signal generated by the local oscillator 31 is lower than the carrier frequency, a tone signal input to the first input terminal is output to the changeover switch 2052. Give instructions.

According to this, as described in the section of the prior art, the output of the mixer 25 is represented by the equation (24). Then, the second item of Expression (24) is attenuated by the filter 24, and a radio frequency signal represented by the following expression is obtained. At this time, the angular frequency ωc = ωL + ωIF, and the sign of the phase data is positive.

[0286]

[Equation 45]

On the other hand, when GSM900 is used, that is, when the frequency of the local signal generated by local oscillator 31 is higher than the carrier frequency, control unit C11
Gives an instruction to the changeover switch 2052 to output a tone signal whose phase is inverted and which is input to the second input terminal.

According to this, the output of the mixer 283 becomes an intermediate frequency signal represented by the following equation.

[Equation 46]

The output of the mixer 282 is an intermediate frequency signal represented by the following equation.

[0290]

[Equation 47]

The output of the adder 284 obtained by adding them is expressed by the following equation.

[0292]

[Equation 48]

Therefore, the output of the mixer 25 is as follows.

[0294]

[Equation 49]

The first item of the above equation is attenuated by the filter 24, and the second item is obtained as a radio frequency signal.
At this time, the angular frequency is ωc = ωL−ωIF, and the sign of the phase data is positive.

As described above, in the multi-band radio having the transmission system having the above-described configuration, the tone phase switching circuit 205 is newly provided, and the tone signal input to the mixer 283 is set according to the system communication band to be used. Is inverted, and the phase relationship between the tone signals input to the two mixers 282 and 283 is switched, so that the polarity of the phase data included in the radio frequency signal is made constant.

Therefore, according to the multi-band radio equipped with the transmission system having the above configuration, it is possible to transmit a radio frequency signal including phase data whose polarity does not change, regardless of which system communication band is used. .

FIG. 12 shows a configuration of a transmission system of a multi-band mobile radio apparatus according to a twelfth embodiment of the present invention. The transmission system of the multi-band mobile radio shown in this figure includes a new switching circuit 206 in addition to the configuration of the conventional transmission system shown in FIG. 23. In the following description, different parts will be mainly described. I do. Of the quadrature data input from a data generator (not shown), the Q signal is
, While the I signal is input to mixer 283.

The tone signal generated by the oscillator 2811 of the oscillation circuit 281 is divided into two, one of which is advanced by 90 ° in phase by the phase shifter 2812 and then the mixer 283
, And the other is input to the tone phase switching circuit 206.

The tone phase switching circuit 206 comprises an inverting amplifier 2061 and a switch 2062. The tone signal generated by the oscillator 2811 is output to the inverting amplifier 206
1 is input to the first input terminal of the changeover switch 2062. The inverting amplifier 2061 inverts the phase of the tone signal input from the oscillator 2811 and
2 to the second input terminal.

The changeover switch 2062 is connected to a control unit C described later.
Switching control is performed by a control signal from the control unit 12, and one of signals input to the first input terminal and the second input terminal is selectively input to the mixer 282.

The control unit C12, like the control unit C7, has a control function related to normal communication and, as a new control function, a function of switching the changeover switch 2062 according to the system communication band to be used. It has.

Next, the transmission operation of the multiband radio having the above configuration will be described. The control unit C12 includes a DCS 18
When 00 is used, that is, when the frequency of the local signal generated by the local oscillator 31 is lower than the carrier frequency, a tone signal input to the first input terminal is output to the changeover switch 2062. Give instructions.

According to this, as described in the section of the prior art, the output of the mixer 25 is represented by the equation (24). Then, the second item of Expression (24) is attenuated by the filter 24, and a radio frequency signal represented by the following expression is obtained. At this time, the angular frequency ωc = ωL + ωIF, and the sign of the phase data is positive.

[0305]

[Equation 50]

On the other hand, when GSM900 is used, that is, when the frequency of the local signal generated by local oscillator 31 is higher than the carrier frequency, control unit C12
Gives an instruction to the changeover switch 2062 to output a tone signal whose phase is inverted, which is input to the second input terminal.

According to this, the output of the mixer 282 is an intermediate frequency signal represented by the following equation.

[0308]

(Equation 51)

The output of the mixer 283 is an intermediate frequency signal represented by the following equation.

[0310]

(Equation 52)

Then, the output of the adder 284 obtained by adding them is expressed by the following equation.

[0312]

(Equation 53)

Therefore, the output of the mixer 25 is as follows.

[0314]

(Equation 54)

The filter 24 attenuates the second term in the above equation, and the first term is obtained as a radio frequency signal.
At this time, the angular frequency is ωc = ωL−ωIF, and the sign of the phase data is positive.

As described above, in the multi-band radio having the transmission system having the above-described configuration, the tone phase switching circuit 206 is newly provided, and the tone signal input to the mixer 282 is input in accordance with the system communication band to be used. Is inverted, and the phase relationship between the tone signals input to the two mixers 282 and 283 is switched, so that the polarity of the phase data included in the radio frequency signal is made constant.

Therefore, according to the multi-band radio equipped with the transmission system having the above configuration, it is possible to transmit a radio frequency signal including phase data whose polarity does not change, regardless of which system communication band is used. .

Next, a description will be given of a modulator of a transmission system of a multi-band mobile radio apparatus according to a thirteenth embodiment of the present invention. FIG. 13 shows the configuration. The modulation section shown in FIG. 13 is provided in a stage preceding the conventional transmission system shown in FIG.
The orthogonal data is generated by performing MSK modulation.

The digital data D represented by '1' and '0' is divided into two parts, one of which is directly input to the first input terminal of the changeover switch 3052, and the other is input to the inverter 3051 and The data is inverted,
The signal is input to the second input terminal of the changeover switch 3052.

The changeover switch 3052 is operated by the control signal from the control unit C13 to control the first input terminal or the second input terminal.
Is input to the data converter 301.

The data converter 301 converts the digital data D represented by '1' and '0' into 'π' and '-
is converted into numerical data α of π ′. This conversion result is input to the pulse generator 302.

The pulse generator 302 calculates the numerical data α
At a predetermined timing to generate a pulse signal P of a predetermined period. This pulse signal P is input to the Gaussian filter 303.

The Gaussian filter 303 performs a weighting process on the pulse signal using a Gaussian filter. This processing result is converted to the orthogonal data converter 3 as phase data φi (t).
04 is input. The orthogonal data converter 304 generates mutually orthogonal phase data (I signal and Q signal) from the phase data φi (t) of the Gaussian filter 302.

The control unit C13, like the control unit C7, has a control function related to normal communication and, as a new control function, a function of controlling the changeover switch 3052 in accordance with the system communication band to be used. It has.

Next, the transmission operation of the multiband radio having the above configuration will be described. When the control unit C13 determines that the frequency of the local signal is lower than the carrier frequency,
When the changeover switch 3052 is controlled to switch to output the digital data D input to the first input terminal, the output of each circuit is as shown in FIG.

On the other hand, when the frequency of the local signal is higher than the carrier frequency, the control section C13 controls the changeover switch 3052 to switch the digital data D input to the second input terminal. Is output as shown in FIG. 14 (b).

That is, by switching the changeover switch 3052, the polarity of the phase data φi (t) is inverted. Here, attention is paid to the following equation.

[0328]

[Equation 55]

As described above, even if the polarity of the phase data φi (t) is inverted, only the polarity of sin changes, that is, only the polarity of the I signal changes. The same effect as when the inverting amplifier 202 is used can be obtained.

It goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0331]

As described above, according to the present invention, the phase relationship between two orthogonal data is always maintained in a predetermined state by, for example, replacing the demodulated orthogonal data according to the system communication band to be received. The polarity of the phase data included in the radio frequency signal is kept constant by, for example, changing the two orthogonal data used for modulation in accordance with the system communication band to be transmitted.

Therefore, according to the present invention, selectable system communication can be performed even when the magnitude relationship between the carrier frequency and the local frequency is switched when the system communication band to be used is switched. A multi-band mobile radio capable of performing normal communication in all bands can be provided.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing a configuration of a receiving system according to a first embodiment of a multiband mobile radio apparatus according to the present invention.

FIG. 2 is a circuit block diagram showing a configuration of a receiving system according to a second embodiment of the multiband mobile radio apparatus according to the present invention.

FIG. 3 is a circuit block diagram showing a configuration of a receiving system according to a third embodiment of the multiband mobile radio apparatus according to the present invention.

FIG. 4 is a circuit block diagram showing a configuration of a receiving system according to a fourth embodiment of the multi-band mobile radio device according to the present invention.

FIG. 5 is a circuit block diagram showing a configuration of a receiving system according to a fifth embodiment of the multi-band mobile radio device according to the present invention.

FIG. 6 is a circuit block diagram showing a configuration of a receiving system of a sixth embodiment of the multi-band mobile radio device according to the present invention.

FIG. 7 is a circuit block diagram showing a configuration of a transmission system according to a seventh embodiment of the multiband mobile radio apparatus according to the present invention.

FIG. 8 is a circuit block diagram showing a configuration of a transmission system of an eighth embodiment of the multi-band mobile radio device according to the present invention.

FIG. 9 is a circuit block diagram showing a configuration of a transmission system of a ninth embodiment of the multi-band mobile radio device according to the present invention.

FIG. 10 is a circuit block diagram showing a configuration of a transmission system according to a tenth embodiment of the multiband mobile radio apparatus according to the present invention.

FIG. 11 is a circuit block diagram showing a configuration of a transmission system of an eleventh embodiment of the multi-band mobile radio device according to the present invention.

FIG. 12 is a circuit block diagram showing a configuration of a transmission system of a twelfth embodiment of the multi-band mobile radio device according to the present invention.

FIG. 13 is a circuit block diagram showing a configuration of a transmission system according to a thirteenth embodiment of the multiband mobile radio apparatus according to the present invention.

FIG. 14 is a signal waveform diagram for explaining the operation of the multi-band mobile wireless device shown in FIG.

FIG. 15 is a diagram showing a typical circuit block configuration of a high-frequency signal processing unit of a conventional multiband mobile radio.

FIG. 16 is a spectrum diagram showing a relationship between frequencies of two system communication bands and frequencies of local signals.

FIG. 17 is a spectrum diagram showing a relationship between frequencies of two system communication bands and frequencies of local signals.

FIG. 18 is a spectrum diagram showing a relationship between frequencies of two system communication bands and frequencies of local signals.

FIG. 19 is a spectrum diagram showing a relationship between frequencies of two system communication bands and frequencies of local signals.

FIG. 20 is a spectrum diagram showing a relationship between frequencies of two system communication bands and frequencies of local signals.

FIG. 21 is a circuit block diagram showing a configuration of a receiving system of a conventional multiband mobile radio.

FIG. 22 is a circuit block diagram showing a configuration of a receiving system of a conventional multiband mobile radio.

FIG. 23 is a circuit block diagram showing a configuration of a transmission system of a conventional multiband mobile radio.

FIG. 24 is a diagram showing a phase relationship between an I signal and a Q signal obtained by a receiving system of the conventional multi-band mobile radio shown in FIG.

FIG. 25 is a diagram showing a phase relationship between an I signal and a Q signal obtained by a receiving system of the conventional multiband mobile radio shown in FIG.

[Description of Signs] 14 mixer 15 filter 16 IF amplifier 171 oscillator circuit 1711 oscillator 1712 phase shifter 172, 174 mixer 173, 175 filter 101, 102, 103 switching circuit 104, 105 tone Phase switching circuit 1011, 1012, 1022, 1032 ... Switches 1021, 1031, 1051, 1061 ... Inverting amplifiers 1041, 1042, 1052, 1062 ... Switches 24 ... Filter 25 ... Mixer 26 ... Filter 27 ... IF amplifier 28 ... Device 281 oscillation circuit 282 283 mixer 2811 oscillator 2812 phase shifter 284 adder 201, 202, 203, 204, 205, 206 switching circuit 2011, 1021, 2022, 2032 switching switch 2021, 20 1,2051,2061,3051 ...
Inverting amplifiers 2041, 2042, 2052, 2062, 3052 ...
Changeover switch 31 Local oscillator

Claims (13)

[Claims] The present invention employs a superheterodyne system, and is capable of selectively receiving signals in a plurality of system communication bands. When the system communication band to be received is switched, the frequency of the RF signal in the system communication band to be received is changed. A quadrature demodulation means for performing quadrature demodulation on a received signal to obtain I data and Q data in a multi-band mobile radio device in which the magnitude relationship with the frequency of a local signal used for down-conversion of this signal is changed; Depending on the magnitude relationship between the RF signal of the system communication band to be performed and the frequency of the local signal used for down-conversion of this signal, the I data and Q data are interchanged and output, or the I data and Q data are left as they are. A multi-band mobile radio, comprising: data switching means for outputting. 2. The method according to claim 1, wherein a signal in a plurality of system communication bands is selectively received by adopting a super heterodyne system. A quadrature demodulation means for performing quadrature demodulation on a received signal to obtain an I signal and a Q signal in a multi-band mobile radio device in which the magnitude relationship with the frequency of a local signal used for down-conversion of this signal is changed; Data polarity inverting means for inverting and outputting the polarity of the I signal, or outputting as it is, according to the magnitude relationship between the RF signal of the system communication band to be performed and the frequency of the local signal used for down-conversion of this signal. A multi-band mobile radio device comprising: 3. A system which employs a super heterodyne system and is capable of selectively receiving signals in a plurality of system communication bands. When the system communication band to be received is switched, the frequency of the RF signal in the system communication band to be received is changed. A quadrature demodulation means for performing quadrature demodulation on a received signal to obtain an I signal and a Q signal in a multi-band mobile radio device in which the magnitude relationship with the frequency of a local signal used for down-conversion of this signal is changed; Data polarity inverting means for inverting and outputting the polarity of the Q signal or outputting it as it is in accordance with the magnitude relationship between the RF signal of the system communication band to be performed and the frequency of the local signal used for down-conversion of this signal. A multi-band mobile radio device comprising: 4. A super heterodyne system is adopted, and signals in a plurality of system communication bands can be selectively received. When the system communication band to be received is switched, the frequency of the RF signal in the system communication band to be received is changed. In a multi-band mobile radio device in which the magnitude relationship with the frequency of a local signal used for down-conversion of this signal changes, frequency conversion for down-converting an RF signal in a system communication band to be received into an IF signal using the local signal Means for generating a first tone signal; a second tone signal having the same frequency as the signal and a phase advance of 90 °; an RF signal of a system communication band to be received; The first tone signal and the second tone signal are interchanged and output according to the magnitude relationship with the frequency of the local signal, or Or a tone switching means for outputting the first tone signal and the second tone signal as they are, and a quadrature demodulation of the IF signal using the first tone signal output from the tone switching means. A first quadrature demodulation unit for obtaining a signal; and a second quadrature demodulation unit for quadrature demodulating the IF signal using a second tone signal output from the tone switching unit to obtain an I signal. A multi-band mobile radio device, comprising: 5. A system which employs a super heterodyne system and is capable of selectively receiving signals in a plurality of system communication bands. When the system communication band to be received is switched, the frequency of the RF signal in the system communication band to be received is determined. In a multi-band mobile radio device in which the magnitude relationship with the frequency of a local signal used for down-conversion of this signal changes, frequency conversion for down-converting an RF signal in a system communication band to be received into an IF signal using the local signal Means for generating a first tone signal; a second tone signal having the same frequency as the signal and a phase advance of 90 °; an RF signal of a system communication band to be received; Depending on the magnitude relationship with the frequency of the local signal, the polarity of the second tone signal is inverted and output, or Tone polarity inverting means for outputting; first quadrature demodulating means for quadrature demodulating the IF signal using the first tone signal to obtain a Q signal; and second quadrature outputting from the tone polarity inverting means. And a second quadrature demodulation means for quadrature demodulating the IF signal using the tone signal to obtain an I signal. 6. A system employing a super heterodyne system, capable of selectively receiving signals in a plurality of system communication bands, and, when the system communication band to be received is switched, the frequency of the RF signal in the system communication band to be received and In a multi-band mobile radio device in which the magnitude relationship with the frequency of a local signal used for down-conversion of this signal changes, frequency conversion for down-converting an RF signal in a system communication band to be received into an IF signal using the local signal Means for generating a first tone signal; a second tone signal having the same frequency as the signal and a phase advance of 90 °; an RF signal of a system communication band to be received; Depending on the magnitude relationship with the frequency of the local signal, the polarity of the first tone signal is inverted and output, or as it is. Tone polarity inverting means for outputting; first quadrature demodulating means for quadrature demodulating the IF signal using the first tone signal output from the tone polarity inverting means to obtain a Q signal; A second quadrature demodulating means for quadrature demodulating the IF signal using a tone signal to obtain an I signal. 7. A system which employs a super heterodyne system, is capable of selectively transmitting signals in a plurality of system communication bands, and, when the system communication band to be transmitted is switched, the frequency of the RF signal in the system communication band to be transmitted and In a multi-band mobile radio whose magnitude relationship with the frequency of a local signal used for up-conversion of this signal changes, the RF signal of the system communication band to be transmitted and the frequency of the local signal used for up-conversion of this signal In accordance with the magnitude relation of the above, the I signal and the Q signal used for quadrature modulation are exchanged and output, or the data switching means for outputting the I signal and the Q signal as they are, and the I signal and the Q output by the data switching means. A multi-band mobile radio, comprising: quadrature modulation means for performing quadrature modulation using a signal. 8. A system employing a super heterodyne system, wherein signals in a plurality of system communication bands can be selectively transmitted, and when the system communication band to be transmitted is switched, the frequency of the RF signal in the system communication band to be transmitted is changed. In a multi-band mobile radio whose magnitude relationship with the frequency of a local signal used for up-conversion of this signal changes, the RF signal of the system communication band to be transmitted and the frequency of the local signal used for up-conversion of this signal Data polarity inverting means for inverting the polarity of the I signal out of the I signal and the Q signal used for quadrature modulation or outputting the signal as it is, and outputting the data polarity inverting means in accordance with the magnitude relation of And a quadrature modulation means for performing quadrature modulation using the I signal and the Q signal. Machine. 9. A super heterodyne system is adopted, and signals of a plurality of system communication bands can be selectively transmitted. When the system communication band to be transmitted is switched, the frequency of the RF signal of the system communication band to be transmitted is changed. In a multi-band mobile radio whose magnitude relationship with the frequency of a local signal used for up-conversion of this signal changes, the RF signal of the system communication band to be transmitted and the frequency of the local signal used for up-conversion of this signal Data polarity inverting means for inverting the polarity of the Q signal out of the I signal and the Q signal used for quadrature modulation or outputting the Q signal as it is, and outputting the data polarity inverting means in accordance with the magnitude relationship of And a quadrature modulation means for performing quadrature modulation using the Q signal and the I signal. Machine. 10. A super heterodyne system is adopted,
It is possible to selectively transmit signals of multiple system communication bands,
In the case of switching the system communication band to be transmitted, in a multi-band mobile radio device in which the magnitude relationship between the frequency of the RF signal in the system communication band to be transmitted and the frequency of the local signal used for up-conversion of the signal changes, A tone signal generating means for generating a first tone signal, a second tone signal having the same frequency as this signal and a phase advance of 90 °, an RF signal in a system communication band to be transmitted, and a frequency of the local signal. And a tone switching unit that interchanges and outputs the first tone signal and the second tone signal or outputs the first tone signal and the second tone signal as they are in accordance with the magnitude relationship between First quadrature modulation means for quadrature-modulating a first tone signal output from the tone switching means using a Q signal; output from the tone switching means A second quadrature modulating means for quadrature modulating the second tone signal by using an I signal; an output of the first quadrature modulating means and an output of the second quadrature modulating means; A multi-band mobile radio, comprising: a means for generating the RF signal using a result and the local signal. 11. A super heterodyne system is adopted,
It is possible to selectively transmit signals of multiple system communication bands,
In the case of switching the system communication band to be transmitted, in a multi-band mobile radio device in which the magnitude relationship between the frequency of the RF signal in the system communication band to be transmitted and the frequency of the local signal used for up-conversion of the signal changes, A tone signal generating means for generating a first tone signal, a second tone signal having the same frequency as this signal and a phase advance of 90 °, an RF signal in a system communication band to be transmitted, and a frequency of the local signal. Tone polarity inverting means for inverting and outputting the polarity of the second tone signal or outputting the tone signal as it is, according to the magnitude relation between the first and second tone signals, and quadrature demodulating the first tone signal using a Q signal. First quadrature demodulation means; second quadrature demodulation means for quadrature modulating a second tone signal output from the tone polarity inversion means using an I signal; A multi-function device comprising: a unit for adding an output of the first quadrature modulation unit and an output of the second quadrature modulation unit, and generating the RF signal using a result of the addition and the local signal. Band mobile radio. 12. A super-heterodyne system is adopted,
It is possible to selectively transmit signals of multiple system communication bands,
In the case of switching the system communication band to be transmitted, in a multi-band mobile radio device in which the magnitude relationship between the frequency of the RF signal in the system communication band to be transmitted and the frequency of the local signal used for up-conversion of the signal changes, A tone signal generating means for generating a first tone signal, a second tone signal having the same frequency as this signal and a phase advance of 90 °, an RF signal in a system communication band to be transmitted, and a frequency of the local signal. And a tone polarity inverting means for inverting and outputting the polarity of the first tone signal or outputting the tone signal intact, and a first tone signal output from the tone polarity inverting means. First quadrature demodulation means for performing quadrature demodulation using a Q signal; second quadrature demodulation means for performing quadrature modulation on the second tone signal using an I signal; A multi-function device comprising: a unit for adding an output of the first quadrature modulation unit and an output of the second quadrature modulation unit, and generating the RF signal using a result of the addition and the local signal. Band mobile radio. 13. A super heterodyne system is adopted,
It is possible to selectively transmit signals of multiple system communication bands,
When the system communication band to be transmitted is switched, in a multi-band mobile radio device in which the magnitude relationship between the frequency of the RF signal in the system communication band to be transmitted and the frequency of the local signal used for up-conversion of this signal changes. A polarity inverting means for inverting the polarity of the baseband signal or outputting it as it is, according to the magnitude relationship between the RF signal of the system communication band to be performed and the frequency of the local signal used for up-conversion of the signal. A quadrature data generating means for generating an I signal and a Q signal when used for quadrature modulation from a baseband signal output from the polarity inverting means; and an I signal and a Q signal generated by the quadrature data generating means. And a quadrature modulation means for performing quadrature modulation.