JPH10135892A - Repeater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow the repeater to attain simultaneous communication among a plurality of mobile equipments at a location where a reception radio wave strength from a base station located remotely is weak and not to receive a radio wave of a control channel from other base station using other carrier. SOLUTION: The repeater is provided with a 1st receiver that is connected between terminals R of SW 4a, 10a, eliminates a specific frequency among reception radio waves from a public base station, and amplifies the signal for a broad frequency band, with a transmitter that is connected between terminals T of SW4a, SW10a to amplify a received radio wave from a mobile equipment, with a 2nd receiver that includes a control section 101 receiving only a control channel radio wave from the base station to detect a synchronizing signal, and the 1st receiver and the transmitter are operated in time division by control signals C1, C2, C3 generated by the control section 101 of the 2nd receiver based on a received synchronizing signal (a).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repeater used in a personal handyphone system.

[0002]

2. Description of the Related Art A repeater amplifies and retransmits radio waves from a base station and a mobile station so that the mobile station can use the radio waves in a place far from the base station and where radio waves are weak. FIG.
It is a block diagram of the conventional repeater. In FIG. 8, 1
Is a antenna, 2 is a bandpass filter, 4b is a circulator that separates a transmission signal and a reception signal on the antenna 1 side,
5 is a low noise amplifier (low noise amplifier), 6b is a low pass filter, 7 is a power supply for supplying and operating a voltage to the amplifier 8 and the power amplifier 12, 8 is an amplifier, 9 is a band pass filter 10b is a transmission signal on the antenna 11 side. A circulator for separating the received signal from the received signal; 11, an antenna for a mobile device; and 12, a power amplifier.

Next, the operation will be described. In the conventional invention, a radio wave from a base station is converted into a reception signal by the antenna 1, a weak reception signal is amplified by the low noise amplifier 5, and a harmonic generated by nonlinearity of the low noise amplifier 5 is removed by the low pass filter 6 b. , And is further amplified by the amplifier 8 so as to have a predetermined transmission power. The transmission power of the amplifier 8 is filtered through the bandpass filter 9 to remove the harmonics, and the antenna 1 is transmitted through the circulator 10b so as not to go to the power amplifier 12 for amplifying the weak reception signal from the mobile device.
1 and radiated into the air. On the other hand, the antenna 11
Is amplified to a predetermined power by the power amplifier 12, and is radiated from the antenna 1 to the air through the circulator 4 b to remove harmonics by the band-pass filter 2 so as not to sneak into the low-noise amplifier 5.

[0004]

In a repeater as a bidirectional amplifier according to the above-described method, the gain of each amplifier is limited by the isolation determined by the operating frequency. For example, assuming that the loss of the filter / circulator is zero and the isolation of the circulator is 20 dB, the power amplifier 12 has a condition of 20 dB, and the low noise amplifier 5 + power amplifier 8 has a condition of 20 dB. If a gain higher than this is obtained, the feedback gain becomes 1 or more, becoming unstable, and there is a problem that a sufficient amplification degree cannot be obtained.

[0005] The present invention has been made to solve the above-described problem, and includes a period for amplifying a radio wave from a base station so that a transmission time and a reception time do not exist simultaneously.
An object is to amplify a weak radio wave sufficiently by dividing and amplifying a period in which a radio wave from a mobile device is amplified.

A first aspect of the present invention is a first receiving apparatus for removing a specific frequency from a received radio wave from a public base station and amplifying the received radio wave from a mobile station, and a transmitting apparatus for amplifying a received radio wave from a mobile station. And a second receiving device that receives only the control channel radio wave from the base station and detects a synchronization signal. The first receiving device transmits and receives a control signal generated by the second receiving device based on the received synchronization signal. An apparatus is operated in a time-division manner to remove control channel radio waves from base stations of other carriers and to obtain a repeater capable of sufficiently amplifying weak radio waves from a target base station.

According to a second aspect of the present invention, the first receiving apparatus is constituted by a double heterodyne system in which the same local oscillation frequency is injected, and the pass band of a filter through which only a specific frequency passes is switched, so that communication quality is improved. This is intended to eliminate control channel radio waves from base stations of other carriers without lowering the frequency.

According to a third aspect of the present invention, a control signal from the second receiving device is generated based on a synchronization signal detection time included in a demodulated signal of a radio wave transmitted from a base station, and the first receiving device and the transmitting device are alternately switched. This is intended to obtain a repeater which is operated so that the received signal is not fed back as in the related art, the amplification of the first receiving device can be increased, and the communication distance can be extended.

According to a fourth aspect of the present invention, the control signal is passed through a band-pass filter through which only the control channel frequency passes until a control signal from the second receiving apparatus is generated, and the control signal is generated by detecting the synchronization signal. An object of the present invention is to provide a repeater capable of avoiding unnecessary reception of a control channel radio wave from another carrier base station and maintaining communication quality by passing through a wide band.

According to a fifth aspect of the present invention, a control signal is generated by detecting a synchronization signal by passing through a band elimination filter in which only the other control channel frequencies do not pass until a control signal from the second receiver is generated. From this point, it is intended to obtain a repeater that can avoid unnecessary reception of control channel radio waves from other carrier base stations and maintain communication quality as a broadband pass.

According to a sixth aspect of the present invention, the first receiving device is disabled until a control signal from the second receiving device is generated, and the first receiving device is activated from the time when the control signal is generated by detecting the synchronization signal. It is an object of the present invention to obtain a repeater capable of avoiding unnecessary reception of control channel radio waves from a carrier base station by operating the apparatus.

According to a seventh aspect of the present invention, after the reception / transmission period is determined, the signal reception electric field strength level of each slot in the reception period of the second reception apparatus is measured, and only the slot having the higher reception electric field strength level is received by the first reception apparatus. And then operate only during the reception / transmission period after the reception field strength level in another slot increases, thereby avoiding unnecessary control channel radio wave reception from other carrier base stations,
The purpose is to obtain a repeater that can maintain the communication quality.

According to an eighth aspect of the present invention, a synthesizer of the second receiving apparatus receives the signal by switching between the first frequency and the second frequency, and uses a control signal obtained from a signal received at the first frequency to receive the first signal in the first receiving period. Of the control signal obtained from the signal received at the second frequency, so that the first receiving device is not operated in the slot where the signal obtained at the second frequency is present. An object of the present invention is to obtain a repeater that can avoid receiving control channel radio waves from a carrier base station and maintain communication quality.

According to a ninth aspect of the present invention, the first receiving apparatus is constituted by a double heterodyne system in which the same local oscillation frequency is injected, and an image canceling mixer having a canceling frequency to be removed is used as a mixer. Then, a filter for avoiding unnecessary reception of control channel radio waves from other carrier base stations has the effect of becoming unnecessary, and it is intended to obtain a repeater that can remove any frequency signal by changing the local oscillation frequency. Is what you do.

[0015]

According to a first aspect of the present invention, there is provided a repeater which removes a specific frequency from a radio wave received from a public base and amplifies the signal in a wide band.
A transmitting device that amplifies a radio wave received from the mobile device, and a second receiving device that receives only the control channel radio wave from the base station and detects a synchronization signal, wherein the second receiving device is configured to receive the synchronization signal based on the reception synchronization signal The first receiving device and the transmitting device are operated in a time-sharing manner by a control signal to be produced.

In the second invention repeater, the first receiving device is constituted by a double heterodyne system in which the same local oscillation frequency is injected, and the first receiving device is provided with a filter that allows only a specific frequency to pass. And a switching means capable of switching the filter to be effective.

In the repeater of the third invention, a control signal from the second receiving device is generated based on a synchronization signal detection time included in a demodulated signal of a radio wave transmitted from the base station,
The first receiving device and the transmitting device are operated alternately.

In the repeater according to the fourth aspect of the present invention, the control signal is generated by passing the signal through the band-pass filter through which only the control channel frequency passes until the control signal from the second receiver is generated. From the point in time, it is characterized by broadband pass.

In the repeater according to the fifth aspect of the present invention, the control signal is passed through a band-eliminating filter in which only the other control channel frequencies do not pass until the control signal from the second receiving device is generated, and the control is performed by detecting the synchronization signal. It is characterized in that the signal is broadband-passed from the time when the signal is generated.

In the repeater according to a sixth aspect of the present invention, the first receiving device is disabled until a control signal is generated from the second receiving device. One receiver is operated.

In the repeater of the seventh invention, the transmission /
After the reception period is determined, each signal reception electric field strength level of each slot in the reception period of the second reception apparatus is measured, and the first reception apparatus is operated only in the slot having the higher reception electric field strength level, and reception in another slot is performed. After the electric field strength level is increased, it is operated only during the reception / transmission period.

In a repeater according to an eighth aspect of the present invention, the first frequency and the second frequency are switched and received by the synthesizer of the second receiving device, and received by a control signal obtained from the signal received at the first frequency. The first receiving device is operated during the period, and the first receiving device is not operated in a slot in which a signal obtained at the second frequency is a control signal obtained from a signal received at the second frequency. It is characterized by the following.

In the repeater according to the ninth aspect, the first receiving device removes a specific frequency from the received radio waves from the public base and amplifies the received radio waves from the mobile station. A transmitting device, comprising a second receiving device that receives only the control channel radio wave from the base station and detects a synchronization signal, wherein the first receiving device is configured by a double heterodyne method of injecting the same local oscillation frequency, Further, an image cancellation mixer having a cancellation frequency to be removed is used as the first mixer.

The repeater according to the embodiment of the present invention has the following specific solution. A repeater according to an embodiment of the present invention includes a first receiving device that removes a specific frequency from a received radio wave from a public base station and amplifies the received radio wave from a mobile device, and a transmission device that amplifies a received radio wave from a mobile device. A second receiver for receiving only the control channel radio wave from the base station and detecting the synchronization signal, wherein the second receiver is a control signal based on the reception synchronization signal, and the first receiver and This is to control the transmission device in a time-division manner.

The repeater according to the embodiment of the present invention
It has a double heterodyne receiving device that injects the same local oscillation frequency, a bandpass filter that allows only a specific frequency to pass after the first mixer, and a SW that switches the passband.

Further, in the second receiving device, a synchronization signal [UW (unique word) signal] included in the radio wave transmitted from the base station is provided.
And a power supply for alternately operating the first receiving device and the transmitting device.

The first receiving apparatus has a band-pass filter serving as an intermediate frequency filter, and usually has a bandwidth determined by the presence or absence of detection of a synchronization signal [UW (unique word) signal] obtained by the second receiving apparatus. SW characterized by switching
It has.

Further, the first receiving apparatus has a band emissive filter serving as an intermediate frequency filter and a wide band band-pass filter, and detects a synchronization signal [UW (unique word) signal] obtained by the second receiving apparatus. It has a switch that switches depending on the presence or absence.

Further, each circuit of the first receiving apparatus is
Has a unique word detection unit and a power supply that start operating when a synchronization signal [UW (unique word) signal] obtained by the receiving device is detected.

Further, the second receiving apparatus has a receiving electric field strength (hereinafter referred to as RSSI) detecting circuit and an RSSI level comparing circuit, and based on the comparison result, the first receiving apparatus is used only for the slot having a large RSSI level. It has a unique word detector and a power supply that operate only during the reception / transmission period after the RSSI level in another slot increases.

The repeater according to the embodiment of the present invention
A second receiving device having a frequency synthesizer for switching between the first frequency and the second frequency for receiving, a unique word detecting unit for detecting a control signal from a signal received at the first frequency, Having the frequency synthesizer for detecting the control signal from the signal received at the second frequency, and operating the first receiving device in the slot where the signal obtained at the second frequency exists. It has a power supply so as not to be caused.

The repeater according to the embodiment of the present invention
An oscillator for producing a local oscillation signal in the first receiving device;
A first mixer; a phase shifter for changing the phase of the local oscillation signal to the first mixer by 90 degrees; a second mixer;
It has respective filters for removing higher harmonics of the output signal of the second mixer, and an image cancel mixer composed of an adder for synthesizing the output signal of the filter.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a schematic configuration diagram of a repeater according to an embodiment of the present invention. In FIG. 1, 1 is an antenna for a base station, 2 is a bandpass filter, 3 is a coupler, 4a is a SW having connection terminals R and T and a control terminal C, 5 is a low noise amplifier, 6a is a band for removing a signal component. Eliminate filter, 7 is power supply, 8 is amplifier, 9 is band pass filter, 10a is SW having connection terminals R and T and control terminal C, 11 is antenna for mobile equipment, 12 is power amplifier, 21 is lower frequency A down mixer 31 for converting the frequency to a higher frequency, an up mixer 31 for converting the frequency to a higher frequency, a switch 41 for short-circuiting the band elimination filter 6a or a switch SW for eliminating the short-circuit state and making the filter effective, and a mixer 51 for 51
Oscillator for generating an injection signal to 1 and 31;
And 101, a control unit that generates a timing signal for controlling each circuit in a time-division manner.

Here, the connection terminal R of the SW 4a, the low noise amplifier 5, the down mixer 21, the band elimination filter 6a, the SW 41, the up mixer 31, the amplifier 8,
The band-pass filter 9 and the SW 10a constitute a first receiving device, and the control unit 101 for outputting the control signals C1, C2, and C3 to the input terminal a of the control unit 101 in the coupler 3 is the second receiving unit. Construct a receiving device. The connection terminal T of the SW 10a and the connection terminal T of the power amplifier 12 and the SW 4a constitute a transmission device.

The amplifying operation of the repeater will be described with reference to FIG. In the case where the receiving operation is started first, the radio wave from the base station is converted into a received signal by the antenna 1,
From the received signal, noise other than the communication signal from the base station is removed by the band pass filter 2 and sent to the coupler 3. This received signal is applied to the low noise amplifier 5 via the SW 4a at the input unit. Then, a part is diverted to the control unit 101 by the coupler 3. The received signal is amplified by the low noise amplifier 5, and the amplified received signal is generated by the oscillator 51 and distributed by the hybrid 61 and a local oscillation signal.
The signals are mixed by the down mixer 21 and converted into an intermediate frequency signal.

In the state where the receiving operation is first started, receiving and amplifying a control channel (hereinafter, referred to as a control CH) from another base station causes confusion in communication. The signal is removed by the band elimination filter 6a having a frequency characteristic capable of removing the control CH signal of the base station, mixed again with the local oscillation signal from the hybrid 61 by the up mixer 31, and converted to the original reception frequency.

The received signal from which the other base station control CH signal has been removed is amplified by the amplifier 8 to a burst average power of 80 mW. The amplified signal is subjected to removal of harmonics by the band-pass filter 9, applied to the output antenna 11 via the output SW 10a, and radiated into space.

A radio wave received from the mobile station is converted into a transmission signal by an antenna 11, amplified to a burst average power of 80 mW by a power amplifier 12, passed through a coupler 3 via an input side SW 4, and converted into a harmonic by a bandpass filter 2. Removed
Radiated from the antenna 1 into space.

At this time, the power supply 7 does not supply power to the amplifier 8 and the power amplifier 12 until the control unit 101 detects a synchronization signal obtained from the control CH from the base station. Does not emit amplified radio waves. In addition, both SW4a and SW10a are set on the terminal R side for amplifying the reception signal from the base station, and SW41 is set on the open side.

Next, the operation of the control unit 101 for generating the time division timing signal will be described with reference to the block diagram of FIG. The base station signal extracted from the input-side coupler 3 is applied to a receiving unit 103 via an isolator 102 that prevents the signal in the control unit 101 from being radiated. The received signal is amplified and frequency-selected by the receiving unit 103 according to a local oscillation signal set by the synthesizer unit 105 so as to receive only the control channel of the base station.
Is converted back to a digital signal. At the same time, the signal from the receiving unit 103 generates a signal indicating the electric field strength by the RSSI 107 and is added to the unique word detecting unit 108 together with the demodulated digital signal.

The unique word detector 108 for generating the time-division timing signal generates a demodulated digital signal based on the output signal of the timing generator 108c for dividing the output signal of the reference oscillator 106. This is shown by the slot format of the signal shown in FIG. Further, FIG.
The pattern detection unit 108a compares the 32-word pattern of the unique word part shown as the UW of the demodulated digital signal, creates a coincident timing, and sends it to the I / F unit, that is, the interface unit 108d. On the other hand, a data reference signal is created by the carrier regenerator 108b from the demodulated digital signal, and the timing is adjusted by the pattern detector. The interface unit 108d generates various control signals C1, C2, and C3 from the timing signal from the pattern detection unit 108.

As described above, when the synchronization signal is detected by the control unit 101, the SW4a and SW10a are connected to the R side only during the period in which the base station signal comes (mobile device reception period), and the period in which the mobile device signal comes Only the (base station reception period) is controlled to be connected to the T side. At this time, the SW 41 also switches the open / short in a synchronized manner so that the communication CH can be received without any problem. RSS for each slot based on synchronization signal
Check the signal level from I107 in the control CH slot,
After confirming that the RSSI value is large, the power supply 7 is similarly controlled. The power supply 7 operates the amplifier 8 for base station radio waves and operates the power amplifier 12 for mobile station radio waves.

For example, FIG. 4A is an open search signal diagram in which a mobile station captures a control CH from a base station.
The control CH from each base station is up to 20 stations in 100 ms for each s. In this figure, CCH1 · CCH3
-The situation where the control CH electric wave is transmitting to CCH20 is shown. FIG. 4B shows the RSSI of C1, C3, and C20.
The level diagram shows that the base station to communicate with is C3 with a high level.

FIG. 4C is a diagram for generating a transmission / reception timing pulse P2 from the pulse P1 indicating the unique word detection position, and shows a control signal C1 for switching the reception / transmission slot in FIG. 4D. Until the pulse P2 is emitted, the terminal T is located on the side of the terminal T so that unnecessary radio waves of the base station are not amplified.

Similarly, FIG. 4E shows a control signal C3 for operating the power supply VR for the amplifier 8 in the reception slot period and operating the power amplifier VT for the transmission period in accordance with the reception / transmission slot switching timing.

FIG. 4F shows an amplifier 8 and a power amplifier 1.
2 operates, the mobile station exchanges control CHs,
, There is no RSSI that has received the control CH of the mobile device. FIG. 4 (G) shows a control signal C2 for turning on the SW 41 after the control channel of the mobile device has disappeared.

According to the present embodiment, the control CH is received from the base station, the synchronization signal is detected, and the reception period / transmission is synchronized so that the mobile station amplifies only the radio wave from the base station to be received. Since the amplifier operates only during the period,
It is not necessary to receive a signal from another base station that is not synchronized. Further, since a control channel of another base station is not received until a synchronization signal is detected, the signal is passed through a band elimination filter, so that unnecessary control channels are not amplified and confusion is avoided.

Embodiment 2 A circuit block diagram as the second embodiment is as shown in FIG. The description of the operation is the same as that of the first embodiment except for the parts described below, and therefore, the details are omitted. During the first synchronization signal detection period, the detection of the synchronization signal by the control unit is performed by the control channel of the base station of another carrier.
Is switched to the output signal frequency of the synthesizer so that the control signal of the own station is detected, and at the same time, the control signal of the other base station is detected from the control CH of the base station of another carrier. During the period, the SWs 4a, 10a, the amplifier 8, and the power amplifier 12 are operated, and at the same time, the amplifier 8 is used only in the reception slot where the control CH of another carrier base station comes.
The power supply 7 and the SW 41 are controlled so as to open the inactive SW 41 and similarly provide a period in which the power amplifier 12 is inactive only in the corresponding mobile device transmission slot.

As a result, an effect is obtained that the intermediate frequency converter / band elimination filter 6a can be omitted.

Next, the timing relationship between the control signals will be described with reference to FIG. FIG. 5A shows the control C of the communication base station.
H shows the reception status. FIG.
FIG. 9 is a reception / transmission switching signal diagram obtained from unique word detection time information obtained by receiving the control CH of FIG. FIG. 5C shows a control CH reception situation from the base station of an unnecessary other carrier, which is not synchronized with the control CH of FIG. 5A. FIG. 5D shows a control signal C2 obtained from, for example, the RSSI signal of the control CH in FIG. FIG. 5E shows an output signal slot of the amplifier 8 included in the first receiving apparatus.
This shows a period in which the C2 signal period in FIG. 5D is removed from the period.

Embodiment 3 FIG. A third embodiment will be described with reference to FIG. In FIG. 7, 1 is an antenna for a base station, 2
Is a bandpass filter, 3 is a coupler, 4a is a SW, 5 is a low noise amplifier, 6c is a bandpass filter for removing harmonic components, 7 is a power supply, 8 is an amplifier, 9 is a bandpass filter, 10a is SW, 11 Is an antenna for a mobile device, 12 is a power amplifier, 21 is an image cancel mixer, 22 and 23 are mixer elements constituting the image cancel mixer 21, 24 and 28 are 90-degree phase shifters, 26 and
27 is a low-pass filter and 29 is an adder. 31 is an up-mixer, 51 is an oscillator, 61 is a hybrid, 1
A control unit 01 generates a timing signal for controlling each circuit in a time-division manner.

Next, the amplifying operation of the repeater will be described with reference to FIG. In the case where the receiving operation is started first, the radio wave from the base station is converted into a received signal by the antenna 1, the received signal is filtered by the band-pass filter 2 to remove noise other than the communication signal from the base station, and the Is partially diverted to the antenna control unit 101 by the
The signal is applied to the low noise amplifier 5 via a. The received signal is amplified by the low-noise amplifier 5, formed by the image cancel mixer 21, by the oscillator 51, and
Is mixed with the local oscillating signal distributed in the step (a), and converted into an intermediate frequency signal.

At this time, the reception frequency is fr, the reception signal R is
= Acosω _r t, when the local oscillation frequency fo, and the local oscillation signal L = Bcosω _o t, the output of the mixer 23 S1 = A
_{Bcosω r t · cosω o t =} S _{[cos (ω r + ω o)} t
_{+ Cos (ω r -ω o)} t ] / 2, the output of the mixer 22 S2
_{= ABcosω r t · cos (ω} o t-90 °) = S [co
_{s [(ω r + ω o} ) t-90 °] + cos [(ω r -ω o) t
+ 90 °]] / 2. However, S = AB.

[0054] When the low-pass filter 26, 27 takes out the low frequency _{component, S1 = Scos (ω r -ω} o) t / 2,
S2 = -Ssin ([omega] _{r- [} omega] _o ) t / 2. Output S3 of 90 degree phase shifter 28 = -Ssin [([omega] _r- [omega] _o ) t-9
0 °] / 2 = Scos (ω _r −ω _o ) t / 2. Therefore, the output St = S1 + S3 = Scos of the adder 29
(Ω _r −ω _o ) t. However, when ω than ω _o is large _r is made to _{S3 = Scos (ω r -ω o} ) t, adder 2
9 = S1 + S3 = 0, and no output appears. Therefore, if determined the local oscillation frequency omega _o so that the frequency to be removed 2 [omega _o - [omega] _r, it is possible to unnecessary frequency components removed. Here, the control C of the base station of another carrier
H becomes a target of the removal frequency.

As described above, the image cancel mixer 2
The intermediate frequency component from which unnecessary frequency components have been removed in 1 is mixed again with the local oscillation signal from the hybrid 61 by the up-mixer 31 and converted into the original reception frequency.

The received signal from which the other base station control CH signal has been removed is amplified by the amplifier 8 to a burst average power of 80 mW. The amplified signal is subjected to removal of harmonics by the band-pass filter 6c, applied to the output antenna 11 via the output SW 10a, and radiated into space.

The radio wave received from the mobile device is converted into a transmission signal by the antenna 11, and the power amplifier 12 has a burst average power of 8.
The signal is amplified to 0 mW, passed through the input side SW 4 a, passes through the coupler 3, removes harmonics by the band-pass filter 2, and is radiated from the antenna 1 into space.

At this time, power is not supplied to the power source 7 / amplifier 8 and the power amplifier 8 until the control unit 101 detects a synchronization signal obtained from the control CH from the base station. Does not emit amplified radio waves. In addition, both SW4a and SW10a are set on the terminal R side for amplifying the reception signal from the base station,
SW41 is set to the open side. The subsequent operation of the operation / control unit 101 is the same as that of the first embodiment.

As described above, unnecessary signals can be removed without using a filter, and there is an effect that the removal frequency can be changed within a certain range of the removal frequency only by changing the local oscillation frequency.

[0060]

Since the present invention is configured and operates as described above, the control CH radio wave from the base station of another carrier can be removed, so that the communication is confused due to unnecessary amplification. Without this, communication between a plurality of mobile devices can be performed even in an area where radio waves are weak such as a long distance.

According to the first aspect of the present invention, a first receiving device that removes a specific frequency from a received radio wave from a public base station and amplifies the received radio wave from a mobile station is amplified. A transmitting device, and a second receiving device that receives only the control CH radio wave from the base station and detects a synchronization signal, wherein the second receiving device is a control signal generated based on the received synchronization signal,
Since the first receiving device and the transmitting device are operated in a time-division manner, it is possible to eliminate the control CH radio wave from the base station of another carrier and to sufficiently amplify the weak radio wave from the target base station. is there.

According to the second invention, the first receiving device is
It is configured by a double heterodyne system in which the same local oscillation frequency is injected, and the pass band of a filter through which only a specific frequency passes is switched. It has the effect of removing radio waves.

According to the third invention, the control signal from the second receiving device is generated based on the synchronization signal detection time included in the demodulated signal of the radio wave transmitted from the base station, and the first receiving device and the transmitting device are generated. Since the operation is performed alternately, the received signal is not fed back as in the related art, and the effect of increasing the amplification degree of the first receiving device and the effect of increasing the communication distance can be obtained.

According to the fourth aspect, the control signal is passed through the band-pass filter through which only the control CH frequency passes until the control signal is generated from the second receiving apparatus, and the control signal is generated by detecting the synchronization signal. Therefore, since the signal is passed over a wide band, it is possible to avoid unnecessary reception of the control CH radio wave from another carrier base station and maintain the communication quality.

According to the fifth invention, until the control signal from the second receiving apparatus is generated, the control signal is passed through the band elimination filter, in which only the other control CH frequencies are not passed, and the control signal is detected by detecting the synchronization signal. Is generated from the time of generation of the control channel, so that unnecessary control CH radio wave reception from another carrier base station can be avoided and the communication quality can be maintained.

According to the sixth aspect, the first receiving device is disabled until the control signal from the second receiving device is generated, and the first signal is generated from the time when the control signal is generated by detecting the synchronization signal. Is operated, so that there is an effect that unnecessary reception of the control CH radio wave from the carrier base station can be avoided.

According to the seventh aspect, after the reception / transmission period is determined, each signal RS in the reception period of 4 slots of the second receiver is transmitted.
Measures SI level and RSS even in reception / transmission period
Since the first receiving apparatus is operated only in the slot having a large I level, and then operated only during the reception / transmission period after the RSSI level in another slot is increased, unnecessary transmission from another carrier base station is performed. There is an effect that the reception of the control CH radio wave can be avoided and the communication quality can be maintained.

According to the eighth aspect, the synthesizer of the second receiving apparatus receives the signal by switching between the first frequency and the second frequency, and uses the control signal obtained from the signal received at the first frequency for the receiving period. Since the first receiving apparatus is operated and the control signal obtained from the signal received at the second frequency is not operated in the slot where the signal obtained at the second frequency exists, the first receiving apparatus is not operated. It is possible to avoid unnecessary reception of the control CH radio wave from another carrier base station and maintain the communication quality.

According to the ninth aspect, the first receiving device is
Since the first mixer is configured as an image cancellation mixer having a frequency to be canceled, the control CH radio wave from unnecessary other carrier base stations is avoided because the first mixer is configured by a double heterodyne system in which the same local oscillation frequency is injected. There is an effect that a filter is not required, and an effect that an arbitrary frequency signal can be removed by changing the local oscillation frequency.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a basic configuration of a repeater according to a first embodiment of the present invention.

FIG. 2 is a circuit block diagram of a control unit according to the present invention.

FIG. 3 is a signal format diagram in a PHS system according to the present invention.

FIG. 4 is a timing relation diagram for generating a reception / transmission switching signal in the present invention.

FIG. 5 is a timing chart for generating an unnecessary signal elimination signal according to the present invention.

FIG. 6 is a block diagram showing a basic configuration of a repeater according to Embodiment 2 of the present invention.

FIG. 7 is a block diagram showing a basic configuration of a repeater according to Embodiment 3 of the present invention.

FIG. 8 is a block diagram showing a basic configuration of a repeater according to a conventional technique.

[Explanation of symbols]

1 antenna, 2 filters, 3 couplers, 4a S
W, 5 amplifiers, 6 filters, 7 power supplies, 8 amplifiers, 9 filters, 10a SW, 11 antennas, 1
2 amplifier, 21 first mixer, 31 second mixer, 41 SW, 51 oscillator, 61 hybrid, 1
01 control unit, 103 receiving unit, 105 synthesizer.

Claims (9)

[Claims] 1. A first receiving device that removes a specific frequency from a received radio wave from a public base and amplifies the received radio wave from a mobile station, a transmitting device that amplifies a received radio wave from a mobile station, and a base station. And a second receiving device for receiving only the control channel radio wave and detecting a synchronization signal. The first receiving device and the transmitting device are time-divided by a control signal generated by the second receiving device based on the reception synchronization signal. A repeater characterized in that it is operated with. 2. A first receiving apparatus comprising a double heterodyne system for injecting the same local oscillation frequency, a filter that allows only a specific frequency to pass through the first receiving apparatus, and a filter that enables this filter to be used. 2. The repeater according to claim 1, further comprising: a switching unit that can perform switching. 3. A method for generating a control signal from a second receiving apparatus based on a synchronization signal detection time included in a demodulated signal of a base station transmission radio wave, and alternately operating the first receiving apparatus and the transmitting apparatus. The repeater according to claim 1, wherein: 4. Passing a band-pass filter through which only the control channel frequency passes until a control signal from the second receiving apparatus is generated, and passing a wide band from the time when the control signal is generated by detecting the synchronization signal. The repeater according to claim 2, wherein: 5. Passing through a band elimination filter in which only the other control channel frequency is not passed until a control signal from the second receiving apparatus is generated, and from a point in time when the control signal is generated by detecting a synchronization signal, 3. The repeater according to claim 2, wherein the signal is passed through a wide band. 6. The first receiving device is disabled until a control signal from the second receiving device is generated, and the first receiving device is not operated until a control signal is generated by detecting a synchronization signal.
3. The repeater according to claim 2, wherein said receiver is operated. 7. After the transmission / reception period is determined, the signal reception electric field strength level of each slot in the reception period of the second reception device is measured, and the first reception device is operated only for the slot having the higher reception electric field strength level. 3. The repeater according to claim 2, wherein the repeater is operated only during the reception / transmission period after the reception field strength level in another slot increases. 8. The first receiving device is received by switching between the first frequency and the second frequency by a synthesizer of the second receiving device and receiving a control signal obtained from a signal received at the first frequency. The first receiving apparatus is not operated in a slot in which a control signal obtained from a signal received at the second frequency is operated and a signal obtained at the second frequency is present. 2. The repeater according to 1. 9. A first receiving apparatus for removing a specific frequency from a received radio wave from a public base and amplifying the received radio wave from a mobile station, a transmitting apparatus for amplifying a received radio wave from a mobile station, and a base station. A second receiving device that receives only the control channel radio wave and detects a synchronization signal, wherein the first receiving device is configured by a double heterodyne system in which the same local oscillation frequency is injected, and as a first mixer thereof. 2. The repeater according to claim 1, wherein an image cancel mixer is used in which a cancel frequency is a frequency to be removed.