JP2001267955A - Composite wireless terminal and wireless system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite wireless terminal that allows a plurality of its wireless sections to simultaneously conduct transmission reception operations without causing interference disturbance with a small-sized configuration. SOLUTION: The composite terminal is provided with a 1st wireless section 11 that has at least a 1st transmission section 12 and a 1st transmission reception common use section 15, a 2nd wireless section 21 that has at least a 2nd reception section 24 and a 2nd transmission reception common use section 25, an antenna common use section 2 that uses one antenna terminal in common to input and output high frequency signals of the 1st and 2nd wireless sections, a control section 1 that controls transmission reception operations, and a transmission final power amplifier means 16 that is built in the 1st transmission section 12 and selects its operating current under the control of the control section. In the case that interference disturbance takes place in the 2nd wireless section 21 by a transmission wave from the 1st wireless section 11, the operating current of the transmission final power amplifier means 16 is switched to decrease a harmonic level of the transmission wave to prevent the interference disturbance thereby allowing a plurality of the wireless sections to conduct transmission reception operations.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio terminal equipped with a plurality of radio circuits of a communication system, and more particularly to a composite radio terminal capable of simultaneously performing transmission and reception operations by a plurality of radio circuits of a communication system, and using the same. Related to wireless systems.

[0002]

2. Description of the Related Art In recent years, with the rapid spread of the mobile communication field, the development competition between device manufacturers and communication companies has been intensifying. Among them, the development of new communication systems, multi-functionality of wireless terminals, and miniaturization are progressing. Thus, a composite wireless terminal has been receiving particular attention. A composite wireless terminal is a terminal that can support a plurality of communication schemes by mounting a plurality of wireless circuits of different communication schemes such as a PDC scheme and a PHS scheme on one wireless terminal. For example, a PDC system that has a wide communication area and can communicate even when moving at high speed but has a low transmission speed, and a PHS system that has a small communication area and can communicate only when moving at low speed but has a high transmission speed are used as one terminal. This makes it possible to supplement the disadvantages of the mutual communication schemes and improve the convenience of the user.

Conventionally, there has been such a composite wireless terminal as shown in FIG. First, referring to FIG.
A configuration of a conventional composite wireless terminal will be described. A conventional composite wireless terminal shown in FIG. 6 includes a control unit 1 and a first wireless unit 11.
, A second radio unit 21, an antenna sharing unit 2, and an antenna terminal 3, and the first radio unit 11
, A first oscillating unit 13, a first receiving unit 14, and a first transmission / reception sharing unit 15. The second radio unit 21 includes a second transmitting unit 22, a second oscillating unit 23, and a second receiving unit. And a second transmission / reception sharing unit 25. The first transmission / reception sharing unit 15 and the second transmission / reception sharing unit 25 are formed of SPDT high-frequency switches. The antenna sharing unit 2 is configured by an SPDT high-frequency switch or duplexer.

[0004] Next, with reference to FIG. 6, an operation of the conventional composite radio terminal configured as described above will be described. As an example of this description, the first wireless unit 11 will be described as a PDC system, and the second wireless unit 21 will be described as a PHS system. First, the first wireless unit 1
1 will be described. Control unit 1
The transmission data is input to the first transmission unit 12 from. on the other hand,
The first oscillating unit 13 receives the frequency data from the control unit 1 and converts the local signal corresponding to the transmission frequency into the first transmitting unit 1.
Enter 2 The first transmission unit 12 performs a modulation operation and a frequency conversion operation using the transmission data and the local signal, amplifies the signal so as to be output from the antenna terminal 3 with desired transmission power, and inputs the amplified signal to the first transmission / reception sharing unit 15. . In the first transmission / reception sharing unit 15, the first transmission unit 12 and the antenna sharing unit 2 are connected by a high-frequency switch. When a high-frequency switch is used for the antenna sharing unit 2, the first transmission / reception sharing unit 15 and the antenna terminal 3 are connected. When a duplexer is used as the antenna duplexer 2, the first antenna is used.
The transmission wave in the PDC frequency band from the transmission / reception sharing unit 15 is transmitted to the antenna terminal 3. Note that when the first radio unit 11 performs the transmission operation, the second radio unit 21 does not perform the transmission / reception operation. Also, when performing the transmission operation by the second wireless unit 21, the same operation as in the case of the first wireless unit 11 is performed.

Next, a case in which the second radio section 21 performs a receiving operation will be described. The received wave input from the antenna terminal 3 is connected to the second transmission / reception sharing unit 25 through the antenna sharing unit 2. When a high-frequency switch is used for the antenna sharing unit 2, the antenna terminal 3 and the second transmission / reception sharing unit 25 are selected and connected. When a duplexer is used for the antenna sharing unit 2, the reception wave in the PHS frequency band from the antenna terminal 3 is transmitted to the second transmission / reception sharing unit 25. Second
The transmission / reception sharing unit 25 is a high-frequency switch, and
Select 4 and connect.

On the other hand, the second oscillating unit 23 receives frequency data from the control unit 1 and inputs a local signal corresponding to a received wave to the second receiving unit 24. The second receiving unit 24 performs a frequency conversion operation and a demodulation operation using the received wave and the local signal, and inputs the received data to the control unit 1. In addition,
When the antenna sharing unit 2 is a duplexer, the first wireless unit 11 and the second wireless unit 21 can perform only the receiving operation at the same time. When the antenna duplexer 2 is a high-frequency switch, the first
The transmission / reception operation can be performed by either the wireless unit 11 or the second wireless unit 21. The same operation is performed when the first radio unit 11 performs the receiving operation.

As described above, as a conventional composite radio terminal, each radio unit is switched and used one by one using a high-frequency switch for an antenna common unit, or a duplexer is used for a common antenna unit. Each radio unit is used one by one, or only reception is operated at the same time.

Further, in a conventional composite wireless terminal, a part of a wireless circuit is shared as disclosed in JP-A-10-84299, JP-A-9-18397, JP-A-11-112382 and the like. Therefore, the transmission / reception operation cannot be performed by a plurality of wireless units at the same time.

[0009]

Conventionally, there has been a demand that a plurality of radio units simultaneously perform transmission and reception operations, such as performing data communication with one radio unit and performing voice communication with the other radio unit. it was high. However, in the above-described conventional composite wireless terminal, transmission and reception operations cannot be performed simultaneously by a plurality of wireless units. Less than,
The reason will be described.

In the case where a high-frequency switch is used in the common antenna unit, when a transmission / reception operation is performed in one of the radio units, the high-frequency switch connects the terminal of the radio unit to the antenna terminal. Therefore, the terminal of the other wireless unit and the antenna terminal cannot be connected. For this reason, the other radio unit could not perform the transmission / reception operation.

In the case where a duplexer is used for the antenna common unit, when one of the radio units is performing a transmitting operation, the fundamental wave and the distorted wave of the transmitted wave are reflected waves generated by mismatching of the antenna unit. As a result, the signal may be re-input to the antenna terminal and cause interference with the other radio unit.

A description will now be given of the reason why the transmission distortion wave causes interference with the other radio section. As an example, one of the radio units performs a transmission operation by the PDC method, and
It is assumed that the receiving operation is performed by the S method. In the PDC transmission frequency band, 946.75 MHz to 959.
When transmitting at 8 MHz, the second harmonic is P
The HS band is the same as 1893.5 MHz to 1919.6 MHz. In this case, if the second harmonic of the transmission wave of one radio unit matches the frequency of the reception wave of the other radio unit, interference will occur in the other radio unit.

Next, considering the levels of the received wave and the interference wave, one of the radio units transmits the signal at the antenna terminal so that the average transmission slot is 29 dBm. At this time, the second harmonic is about -60 dBm. On the other hand, the reception sensitivity of the PHS is specified to be -97 dBm or less. In the PHS system, when there is an interference wave of the same frequency, the interference wave is 13 dB higher than the reception wave so that the reception sensitivity is not affected.
Must be lower. That is, assuming that the loss of the antenna shared unit and the transmission / reception shared unit is 1 dB each, the second harmonic level input to the other wireless unit is −112 dBm.
It must be: The amount of reflection from the antenna connected to the antenna terminal differs depending on the usage status of the wireless terminal. For example, if you hold it in your hand or put it on a desk,
The reflection amount fluctuates greatly, and is about -2 dB at the maximum.

In the duplexer used for the antenna common unit, the attenuation of the PHS band from one radio unit side to the antenna terminal side is about 20 dB. That is, the level of the second harmonic reflected by the antenna and input to the other radio section is -84 dBm, which is larger than -112 dBm. For this reason, sensitivity degradation occurs in the other wireless unit. In addition, if an attempt is made to increase the attenuation of the duplexer, the size of the duplexer becomes large and expensive, which is a factor refusing to reduce the size and cost of the wireless terminal.
For the reasons described above, it was not possible to perform transmission / reception operations simultaneously by a plurality of radio units.

Next, the reason why the other radio unit causes interference and obstruction by the transmission fundamental wave will be described. One of the radio units transmits signals at an antenna terminal so that the average transmission slot is 29 dBm. At this time, when the receiving operation is performed by the other radio unit, considering the amount of reflection at the antenna -2 dB and the amount of attenuation of the PDC band at the duplexer of the antenna common unit of about 20 dB, the fundamental wave of the PDC transmission wave is equal to that of the other. 7 dB for radio
Enter with m. When the transmission frequency of one radio unit is の of the reception frequency of the other radio unit, if the transmission wave is input to the other radio unit at 0 dBm or more, the second harmonic is generated in the low noise amplifier of the other radio unit. And interference occurs. Due to the above factors, simultaneous transmission / reception operations could not be performed by multiple wireless units.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. A composite wireless terminal capable of simultaneously performing transmission and reception operations by a plurality of wireless units without causing interference due to a small configuration. To provide.

[0017]

A composite radio terminal according to the present invention comprises a first radio section having at least a first transmission section, a first reception section, and a first transmission / reception sharing section, and at least a second transmission section and a second transmission section. A second radio section having a receiving section and a second transmission / reception sharing section, an antenna sharing section for sharing high-frequency input / output of the first and second radio sections with one antenna terminal, and a control section for controlling transmission / reception operations A transmission final power amplifying means which is built in the first transmission unit and switches an operating current under the control of the control unit, wherein interference wave is generated in the second radio unit by a transmission wave from the first radio unit. The control unit controls the operating current of the transmission final power amplifying means to lower the harmonic level of the transmission wave. With this configuration, it is possible to reduce the size of the device without causing interference and to enable simultaneous transmission and reception operations using a plurality of wireless circuits.

The composite radio terminal according to the present invention comprises a first radio section having at least a first transmission section, a first reception section, and a first transmission / reception sharing section, at least a second transmission section, a second reception section, and a second transmission / reception section. A second radio unit having a common unit, an antenna common unit for sharing high-frequency input / output of the first and second radio units with one antenna terminal, a control unit for controlling transmission and reception operations, and control of the control unit A high-frequency filter having a switching function of switching whether or not to be inserted between the first transmission / reception sharing unit and the first transmission unit, and the second radio unit using a transmission wave from the first radio unit. In the case where the interference is generated, the high frequency filter is switched so as to be inserted between the first transmission / reception sharing unit and the first transmission unit under the control of the control unit. With this configuration, it is possible to reduce the size of the device without causing interference and to enable simultaneous transmission and reception operations using a plurality of wireless circuits.

The composite radio terminal according to the present invention comprises a first radio section having at least a first transmission section, a first reception section, and a first transmission / reception shared section, at least a second transmission section, a second reception section, and a second transmission / reception section. A second radio unit having a common unit; an antenna common unit for sharing high-frequency input / output of the first and second radio units with one antenna terminal; a control unit for controlling transmission / reception operation; A low-noise amplifier that is built in and switches an operating current under the control of the control unit. When interference is caused in the second wireless unit by a transmission wave from the first wireless unit, the control unit controls the second wireless unit. The operating current of the low-noise amplifier is switched so as to lower the harmonic level of the transmission wave. With this configuration, it is possible to reduce the size of the device without causing interference and to enable simultaneous transmission and reception operations using a plurality of wireless circuits.

The composite wireless terminal according to the present invention is characterized in that
The transmission unit includes a transmission final power amplification unit, and the second transmission unit includes a low noise amplification unit. With this configuration, a wireless terminal having good reception sensitivity characteristics is provided, and a plurality of wireless circuits can simultaneously perform transmission and reception operations.

A composite wireless terminal according to the present invention comprises a first wireless unit having at least a first transmitting unit, a first receiving unit, and a first transmitting / receiving unit, and at least a second transmitting unit, a second receiving unit, and a second transmitting / receiving unit. A second radio unit having a common unit, an antenna common unit for sharing high-frequency input / output of the first and second radio units with one antenna terminal, a control unit for controlling transmission and reception operations, and control of the control unit A high-frequency filter having a switching function of switching whether or not to be inserted between the second transmission / reception sharing unit and the second reception unit, and the second radio unit using a transmission wave from the first radio unit. In the case where the interference is generated, the high frequency filter is switched so as to be inserted between the second transmission / reception sharing unit and the second transmission unit under the control of the control unit. With this configuration, it is possible to reduce the size of the device without causing interference and to enable simultaneous transmission and reception operations using a plurality of wireless circuits.

The composite radio terminal according to the present invention has a configuration in which the high-frequency filter is built in the first transmission / reception shared unit or the second transmission / reception shared unit. With this configuration, the size of the device can be reduced.

The composite radio terminal according to the present invention has a configuration in which the high-frequency filter is built in the first transmitting section or the second receiving section. With this configuration, the size of the device can be reduced.

The composite radio terminal according to the present invention includes a first radio section for transmitting and receiving a first high-frequency signal, a second radio section for transmitting and receiving a second high-frequency signal, and high-frequency input / output of the first and second radio sections. An antenna sharing unit shared by one antenna terminal, a control unit for controlling transmission / reception operation, and a memory for storing a specific channel relationship in which interference is caused in the second wireless unit by a transmission wave from the first wireless unit And when the occurrence of the specific channel relationship stored in the memory unit under the control of the control unit is detected, the specific channel is not used. With this configuration, it is possible to simultaneously perform transmission and reception operations with a plurality of wireless circuits without changing the design of a conventional wireless unit and without causing interference.

The wireless system according to the present invention is described in claim 1
The composite wireless terminal according to any one of Items 1 to 8, is used. With this configuration, it is possible to realize a wireless system in which a wireless terminal that is reduced in size and capable of simultaneously performing transmission and reception operations by a plurality of wireless circuits is arranged.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, first to fifth embodiments of the present invention will be described in detail with reference to FIGS. (First Embodiment) First, a basic configuration of a composite wireless terminal according to a first embodiment of the present invention will be described with reference to FIG. The composite wireless terminal according to the first embodiment shown in FIG. 1 includes a control unit 1, a first wireless unit 11,
The first radio unit 11 includes a radio unit 21, an antenna sharing unit 2, and an antenna terminal 3.
A first transmitting unit 12 in which the first oscillator 6 is built, and a first oscillating unit 13
, A first receiving unit 14, and a first transmission / reception sharing unit 15. The second radio unit 21 includes a second transmission unit 22, a second oscillation unit 23, a second reception unit 24, and a second transmission / reception unit 24. And a common unit 25. First transmission / reception sharing unit 15 and second transmission / reception sharing unit 2
Reference numeral 5 denotes an SPDT high-frequency switch. The antenna sharing unit 2 is configured by a sharing device. The first transmission final amplifying means 16 can control its operating current by the control unit 1.

Next, the operation of the composite wireless terminal according to the first embodiment of the present invention configured as described above will be described with reference to FIG. As an example, the first wireless unit 11
The case where the C system and the PHS system are adopted for the second radio unit 21, that is, the case where the first radio unit 11 performs the transmission operation by the PDC system and the second radio unit 21 performs the reception operation by the PHS system will be described. .

First, transmission data is input from the control unit 1 to the first transmission unit 12. On the other hand, the first oscillation unit 13 includes the control unit 1
And oscillates a local signal corresponding to the transmission frequency based on the frequency data from the first transmission unit and inputs the local signal to the first transmission unit 12. First
The transmission unit 12 performs modulation and frequency conversion operations using the transmission data and the local signal, and amplifies the first transmission final amplifying unit 16 so that the required output power is output from the antenna terminal 3. Enter 15 The operating current of the first transmission final amplifying unit 16 increases under the control of the control unit 1 when the transmission frequency of the first radio unit 11 and the reception frequency of the second radio unit 21 have a specific relationship. 2 is to prevent interference by the radio unit 21 (details will be described later). The first transmission / reception sharing unit 15 connects the first transmission unit 12 and the antenna sharing unit 2 with a high-frequency switch. In the duplexer of the antenna sharing unit 2, the PDC band is a pass band and the PHS band is a stop band between the first transmission / reception sharing unit 15 side and the terminal of the antenna terminal 3. Therefore, the PDC band is transmitted to the antenna terminal and transmitted through the connected antenna.

On the other hand, the PHS input from the antenna terminal 3
The received wave is transmitted to the second transmission / reception shared unit 25 by the antenna shared unit 2.
Is transmitted to At this time, the PDC transmission wave reflected by the mismatch of the antenna is also input to the antenna terminal 3 at the same time.
The PHS band is a pass band and the PDC band is a stop band between the antenna terminal 3 and the terminal of the second transmission / reception sharing unit 25. Therefore, the PHS band is transmitted to the antenna terminal. The second transmission / reception sharing unit 25 connects the antenna terminal 3 and the second reception unit 24 by a high-frequency switch. On the other hand, the second oscillating unit 23 receives frequency data from the control unit 1 and inputs a local signal corresponding to the reception frequency to the second receiving unit 24. The second receiving unit 24 performs a frequency conversion operation and a demodulation operation using the received wave and the local signal, and outputs received data to the control unit 1.

Next, prevention of interference by the first transmission final amplification means 16 will be described. That is, a specific relationship between the transmission frequency of the first radio unit and the reception frequency of the second radio unit when controlling to increase the operating current of the first transmission final amplification unit 16 to prevent interference will be described. I do. In some cases, the frequency of the distorted wave of the PDC transmission wave transmitted by the first transmission unit 12 and the frequency of the PHS reception wave received by the second reception unit 24 match. That is, for example, the PDC transmission wave from the first transmission unit 12 is 953.275 MHz.
, The second receiving unit 24 transmits
This is a case where the receiving operation is performed at 6.55 MHz (953.275 MHz × 2). In that case, antenna terminal 3
The second harmonic of the PDC transmission wave transmitted from the antenna is input to the antenna terminal 3 again due to the mismatch of the antenna, and the sensitivity is deteriorated due to the interference of the same harmonic frequency as the frequency of the PHS reception wave of the second receiver 24. Would be. Second
In order not to affect the sensitivity of the receiving unit 24, the second harmonic at the antenna terminal 3 must be reduced to -110 dBm or less. The 2nd harmonic output from the first radio section is-
About 60 dBm, and the PH
The attenuation of the S band, that is, the second harmonic of the PDC is about 20 dB. Assuming that the reflection at the antenna is -2 dB, the second harmonic input to the antenna terminal 3 is -82 dB.
m, and the attenuation is short by 28 dB.

On the other hand, when the operating current of the first transmission final amplifying means 16 is increased, the distortion characteristic is improved and the generation level of the second harmonic can be reduced. Generally, in an amplifier, when the efficiency is considered to be constant, if the operating current is increased by n times, and the output power is the same, the m-th harmonic level is 10 l.
og (n × m) dB can be reduced.

As described above, by increasing the operating current, it is possible to reduce the distortion wave generation level. Further, since the distortion wave generation level itself can be suppressed, spatial coupling to other circuits can also be suppressed. The control of the operating current is based on the PDC transmission wave 2.
The control is performed only when the second harmonic coincides with the PHS reception wave, and the operating current is not controlled in other frequencies. If the amount of attenuation is insufficient even after performing the above control, it is necessary to further employ an appropriate amount of attenuation of the duplexer in the antenna common unit, but the above control reduces the distortion wave generation level. Therefore, a smaller duplexer having a small attenuation can be employed.

As described above, in the composite wireless terminal of the first embodiment, the size of the wireless terminal can be reduced by controlling the operating current of the final transmission amplifying means. Operation can be performed. Note that, as described above, the composite wireless terminal according to the first embodiment is not limited to two wireless units, and may be configured from three or more wireless units.

(Second Embodiment) First, a basic configuration of a composite wireless terminal according to a second embodiment of the present invention will be described with reference to FIG. The composite wireless terminal according to the first embodiment shown in FIG. 2 includes a high-frequency filter that uses a band used by the first transmission unit 12 as a pass band, and uses a band used by the second reception unit 24 as a stop band. A first filter 17 as a high-frequency filter including a high-frequency switch for switching whether or not to pass the signal;
And the first transmission / reception sharing unit 15. Other elements having the same reference numerals as those shown in FIG.
This is the same as that in the embodiment. However, the first transmission final amplification means 16 as shown in FIG. 1 is not built in the first transmission unit 12 of the composite wireless terminal according to the second embodiment. Also, the first filter 17 as a high frequency filter having a switching function is replaced with the first transmission / reception duplexer 15,
Alternatively, it may be built in the first transmission unit 12.

Next, the operation of the composite wireless terminal according to the second embodiment of the present invention configured as described above will be described with reference to FIG. Elements having the same reference numerals as those shown in FIG. 1 operate in the same manner as those in the first embodiment. As an example of this operation, the case where the PDC system is adopted for the first radio unit 11 and the PHS system is adopted for the second radio unit 21, that is, the first radio unit 11 performs the transmission operation by the PDC system and the second radio unit 21 Performs a receiving operation by the PHS method.

The transmission signal modulated and amplified by the first transmission section 12 is output to the first filter 17. First filter 1
7 is a PDC frequency band whose pass band is PH
A filter in the S frequency band, which is a second harmonic of a PDC transmission wave transmitted by the first transmission unit 12 and a second reception unit 2
When the frequency of the received PHS wave coincides with the frequency of the PHS 4, the high-frequency switch of the first filter 17 is switched to insert the high-frequency filter. The PHS frequency band is blocked to prevent interference. At this time, since the insertion loss of the first filter 17 increases, it is necessary to increase the output power in the first transmission unit 12 so that the antenna terminal 3 has a predetermined power. When the second harmonic of the PDC transmission wave does not match the PHS reception wave, the high-frequency switch is switched so as not to insert the high-frequency filter, so that it is not necessary to increase the output power. Therefore, by inserting the high-frequency filter only when necessary, it is possible to minimize the increase in the output power of the first transmission unit 12 performed to cover the insertion loss of the filter, that is, the increase in current. Can,
The size of the battery can be reduced, and the size of the wireless terminal can be reduced.

As described above, the composite wireless terminal according to the second embodiment can reduce the size of the device.
The transmission and reception operation can be performed simultaneously by a plurality of wireless circuits. Note that, as described above, the composite wireless terminal according to the second embodiment is not limited to two wireless units, and may be configured from three or more wireless units.

(Third Embodiment) First, a basic configuration of a composite wireless terminal according to a third embodiment of the present invention will be described with reference to FIG. The composite wireless terminal according to the third embodiment shown in FIG. 3 has a low-noise amplifier 26 built in the second receiving unit 25 and whose operating current is controlled by the control unit 1.
It is comprised including. Other elements having the same reference numerals as those shown in FIG. 1 are the same as those in the first embodiment. However, the first transmission final amplification means 16 as shown in FIG. 1 is not built in the first transmission unit 12 of the composite wireless terminal according to the third embodiment.

Next, the operation of the composite wireless terminal according to the third embodiment of the present invention configured as described above will be described with reference to FIG. Elements having the same reference numerals as those shown in FIG. 1 operate in the same manner as those in the first embodiment. As an example of this operation, the case where the PDC system is adopted for the first radio unit 11 and the PHS system is adopted for the second radio unit 21, that is, the first radio unit 11 performs the transmission operation by the PDC system and the second radio unit 21 Performs a receiving operation by the PHS method.

The PDC transmission wave from the first radio unit 11 is connected to the antenna terminal 3 through the antenna sharing unit 2. On the other hand, the PHS reception wave is input to the second wireless unit 21 through the antenna terminal 3. At this time, the PDC transmission wave reflected by the mismatch of the antenna is also input at the same time. When the fundamental frequency of the PDC transmission wave and the half of the frequency of the PHS reception wave are the same and the PDC fundamental wave is inputted to the second reception unit 24 at 0 dBm or higher, the low-noise amplifier 26 of the second reception unit 24 performs harmonic amplification. Waves are generated and the receiving sensitivity is deteriorated. At this time, by increasing the operating current of the low noise amplifier 26, it is possible to reduce the harmonic level and prevent interference.

In general, assuming that the efficiency is constant in an amplifier, when the operating current is increased by n times and the output power is the same, the m-th harmonic level can be reduced by 10 log (n × m) dB. The control of the operating current is performed by the PDC
The control is performed only when the fundamental frequency of the transmission wave and the half of the frequency of the PHS reception wave are the same, and when the frequency is other than that, the operation current is not controlled. If the amount of attenuation is still insufficient even after performing this control, it is necessary to further employ an appropriate amount of attenuation of the duplexer in the antenna common part.
Since the distortion wave generation level is reduced by the above control,
A smaller duplexer with a small amount of attenuation can be employed.

As described above, the composite wireless terminal according to the third embodiment can be downsized by controlling the operating current of the low-noise amplifier, and a plurality of wireless circuits can simultaneously transmit and receive. I can do it. Note that the composite wireless terminal according to the third embodiment is:
As described above, the present invention is not limited to the two wireless units, and may include three or more wireless units.
Further, in the third embodiment, in addition to the low noise amplifying means in the third embodiment, the transmission final power amplifying means as described in the first embodiment is built in the first transmitting unit. It may be.

(Fourth Embodiment) First, a basic configuration of a composite wireless terminal according to a fourth embodiment of the present invention will be described with reference to FIG. The composite wireless terminal according to the fourth embodiment shown in FIG. 4 has a high-frequency filter that uses a band used by the second receiving unit 24 as a pass band and a band used by the first transmitting unit 12 as a stop band, and passes through the filter. A second filter 27 as a high-frequency filter including a high-frequency switch for switching whether or not to perform
It is configured so as to be provided between the transmitting and receiving unit 25. Others
Elements having the same reference numerals as those shown in FIG. 1 are the same as those in the first embodiment. However, the first transmission final amplification means 16 as shown in FIG. 1 is not built in the first transmission unit 12 of the composite wireless terminal according to the fourth embodiment. Further, a second filter 27 as a high-frequency filter having a switching function may be incorporated in the second transmission / reception duplexer 25 or the second reception unit 24.

Next, the operation of the composite wireless terminal according to the fourth embodiment of the present invention configured as described above will be described with reference to FIG. Elements having the same reference numerals as those shown in FIG. 1 operate in the same manner as those in the first embodiment. As an example of this operation, the case where the PDC system is adopted for the first radio unit 11 and the PHS system is adopted for the second radio unit 21, that is, the first radio unit 11 performs the transmission operation by the PDC system and the second radio unit 21 Performs a receiving operation by the PHS method.

The PDC transmission wave from the first radio unit 11 is connected to the antenna terminal 3 through the antenna sharing unit 2.
On the other hand, the PHS reception wave input to the antenna terminal 3 is connected to the second transmission / reception duplexer 25 through the antenna duplexer 2. In the second duplexer 25, the antenna duplexer 2 and the second filter 27 are connected by a high-frequency switch.
The second filter 27 has a pass band of the PHS frequency band and a stop band of the PDC frequency band. When the fundamental frequency of the PDC transmission wave and the half of the PHS reception wave are the same, the second filter 27 is used. The high frequency switch is switched to insert a high frequency filter, which blocks the PDC frequency band to prevent interference. At this time, since the loss of the second filter 27 increases, the reception sensitivity of the second radio unit 21 deteriorates by the insertion loss of the second filter. If the fundamental frequency of the PDC transmission wave does not match the half of the frequency of the PHS reception wave,
Since the high frequency switch is switched so that the high frequency filter is not inserted, the reception sensitivity does not deteriorate. That is, by inserting a high-frequency filter only when necessary,
Deterioration of reception sensitivity due to insertion loss of the filter can be made only at the minimum necessary time, and a wireless terminal with good reception sensitivity characteristics can be provided.

As described above, the composite wireless terminal according to the fourth embodiment provides a composite wireless terminal having good reception sensitivity characteristics, and a plurality of wireless circuits can simultaneously perform transmission and reception operations. Note that the composite wireless terminal according to the fourth embodiment is not limited to two wireless units as described above, and may be configured from three or more wireless units.

(Fifth Embodiment) First, with reference to FIG. 5, a basic configuration of a composite wireless terminal according to a fifth embodiment of the present invention will be described. The composite wireless terminal according to the fifth embodiment shown in FIG. 5 includes a memory unit 4 connected to the control unit 1. Other elements having the same reference numerals as those shown in FIG. 1 are the same as those in the first embodiment. However, the first transmission final amplifying means 16 as shown in FIG. 1 is not incorporated in the first transmission section 12 of the composite wireless terminal according to the fifth embodiment.

Next, the operation of the composite wireless terminal according to the fifth embodiment of the present invention configured as described above will be described with reference to FIG. Elements having the same reference numerals as those shown in FIG. 1 operate in the same manner as those in the first embodiment. As an example of this operation, the case where the PDC system is adopted for the first radio unit 11 and the PHS system is adopted for the second radio unit 21, that is, the first radio unit 11 performs the transmission operation by the PDC system and the second radio unit 21 Performs a receiving operation by the PHS method.

The PDC transmission wave from the first radio unit 11 is connected to the antenna terminal 3 through the antenna sharing unit 2. On the other hand, the PHS reception wave input to the antenna terminal 3 is input to the second radio unit 21 through the antenna sharing unit 2. At this time, if the harmonic of the PDC transmission wave and the fundamental wave of the PHS reception wave have the same frequency, the second reception unit 24 causes interference and disturbance due to the PDC transmission wave. Therefore, the first wireless unit 1
In the first and second radio units 21, the frequency relationship that causes mutual interference is input to the memory unit 4 in advance, and the frequency relationship that causes interference when the two wireless units simultaneously perform transmission and reception operations. The control is performed by the control unit 1 so as not to be caused. In this case, there is no need to change the design of the conventional radio unit.

As described above, in the composite wireless terminal according to the fifth embodiment, transmission and reception operations can be performed simultaneously by a plurality of wireless circuits without changing the design of the conventional wireless unit. Note that the composite wireless terminal according to the fifth embodiment is not limited to two wireless units as described above, and may be configured from three or more wireless units.

[0051]

The composite radio terminal according to the present invention is configured as described above, does not require any design change, has a small configuration, has good reception sensitivity characteristics without causing interference, and has a plurality of radio sections. A composite wireless terminal capable of transmitting and receiving simultaneously can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of a composite wireless terminal according to a first embodiment of the present invention;

FIG. 2 is a block diagram showing a basic configuration of a composite wireless terminal according to a second embodiment of the present invention;

FIG. 3 is a block diagram showing a basic configuration of a composite wireless terminal according to a third embodiment of the present invention;

FIG. 4 is a block diagram showing a basic configuration of a composite wireless terminal according to a fourth embodiment of the present invention;

FIG. 5 is a block diagram showing a basic configuration of a composite wireless terminal according to a fifth embodiment of the present invention;

FIG. 6 is a block diagram showing a basic configuration of a conventional composite wireless terminal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Control part 2 Antenna sharing part 3 Antenna terminal 4 Memory part 11 1st radio | wireless part 12 1st transmission part 13 1st oscillation part 14 1st reception part 15 1st transmission / reception sharing part 16 1st transmission final amplification means 17 1st filter Reference Signs List 21 second radio section 22 second transmission section 23 second oscillation section 24 second reception section 25 second transmission and reception common section 26 low noise amplifier 27 second filter

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Takashi Ui Inventor F-term (reference), Matsushita Communication Industrial Co., Ltd. 4-1, Tsunashimahigashi 4-chome, Kohoku-ku, Yokohama-shi, Kanagawa 5K011 DA12 DA21 EA03 GA05 GA06 JA01 KA05 5K067 AA03 BB02 GG02 KK01 KK17

Claims (9)

[Claims] A first transmitting unit, a first receiving unit, and a first transmitting unit;
A first wireless unit having a transmission / reception sharing unit, and at least a second
A second unit having a transmission unit, a second reception unit, and a second transmission / reception sharing unit;
A radio unit, and high-frequency input / output of the first and second radio units
An antenna sharing unit shared by two antenna terminals, a control unit for controlling a transmission / reception operation, and transmission final power amplifying means built in the first transmission unit and switching an operation current under the control of the control unit; When interference is caused in the second radio unit by a transmission wave from the radio unit, the operating current of the transmission final power amplifying unit is switched to lower the harmonic level of the transmission wave under the control of the control unit. Composite wireless terminal. 2. The method according to claim 1, wherein at least the first transmitting section, the first receiving section, and the first
A first wireless unit having a transmission / reception sharing unit, and at least a second
A second unit having a transmission unit, a second reception unit, and a second transmission / reception sharing unit;
A radio unit, and high-frequency input / output of the first and second radio units
An antenna sharing unit shared by two antenna terminals, a control unit for controlling transmission and reception operations, and switching between insertion and non-insertion between the first transmission and reception sharing unit and the first transmission unit under the control of the control unit. A high-frequency filter having a switching function, and when interference is caused in the second wireless unit by a transmission wave from the first wireless unit, the high-frequency filter is controlled by the control unit to control the high-frequency filter with the first transmission / reception sharing unit. A composite wireless terminal that switches to be inserted between the wireless communication terminal and the first transmission unit. 3. At least a first transmitting unit, a first receiving unit, and a first transmitting unit.
A first wireless unit having a transmission / reception sharing unit, and at least a second
A second unit having a transmission unit, a second reception unit, and a second transmission / reception sharing unit;
A radio unit, and high-frequency input / output of the first and second radio units
An antenna sharing unit shared by two antenna terminals, a control unit for controlling a transmission / reception operation, and a low-noise amplifier built in the second reception unit and switching an operation current under the control of the control unit; From the second
A composite wireless terminal, wherein, when interference is generated in a wireless unit, the operating current of the low-noise amplifier is switched to reduce distortion of the low-noise amplifier under the control of the control unit. 4. The composite wireless terminal according to claim 1, wherein said first transmitting unit includes a transmission final power amplifying unit, and said second receiving unit includes a low noise amplifying unit. 5. At least a first transmitting unit, a first receiving unit and a first transmitting unit.
A first wireless unit having a transmission / reception sharing unit, and at least a second
A second unit having a transmission unit, a second reception unit, and a second transmission / reception sharing unit;
A radio unit, and high-frequency input / output of the first and second radio units
An antenna sharing unit shared by two antenna terminals, a control unit for controlling transmission and reception operations, and switching between insertion and non-insertion between the second transmission and reception sharing unit and the second reception unit under the control of the control unit. A high-frequency filter having a switching function, wherein when the transmission wave from the first wireless unit causes interference in the second wireless unit, the control unit controls the high-frequency filter with the second transmission / reception sharing unit. A composite wireless terminal that switches to be inserted between the wireless communication terminal and the second transmission unit. 6. The composite wireless terminal according to claim 2, wherein said high-frequency filter is built in said first transmission / reception shared unit or said second transmission / reception shared unit. 7. The high frequency filter according to claim 2, wherein said high frequency filter is incorporated in said first transmitting section or said second receiving section.
Or the composite wireless terminal according to 5. 8. A first radio section for transmitting and receiving a first high-frequency signal, a second radio section for transmitting and receiving a second high-frequency signal, and high-frequency input / output of the first and second radio sections are shared by one antenna terminal. An antenna sharing unit, a control unit that controls transmission and reception operations, and a memory unit that stores a specific channel relationship in which interference is caused in the second radio unit by a transmission wave from the first radio unit, When the occurrence of the specific channel relationship stored in the memory unit under the control of a control unit is detected, the specific channel is not used. 9. A wireless system using the composite wireless terminal according to claim 1.