WO2003067786A1 - Haulingless rf repeater and method thereof - Google Patents
Haulingless rf repeater and method thereof Download PDFInfo
- Publication number
- WO2003067786A1 WO2003067786A1 PCT/KR2002/001911 KR0201911W WO03067786A1 WO 2003067786 A1 WO2003067786 A1 WO 2003067786A1 KR 0201911 W KR0201911 W KR 0201911W WO 03067786 A1 WO03067786 A1 WO 03067786A1
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- WIPO (PCT)
- Prior art keywords
- signal
- unit
- cable unit
- public cable
- receiving
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15564—Relay station antennae loop interference reduction
- H04B7/15578—Relay station antennae loop interference reduction by gain adjustment
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
Definitions
- the present invention relates to a repeater and repeating method of the
- repeater and repeating method of the same which are capable of repeating a
- a repeater is disposed between a bast station and a terminal station and is
- an optical repeater As the types of repeaters, there are provided an optical repeater,
- microwave repeater variable wave repeater
- RF signal repeater etc.
- the RF signal repeater is economical and has a few problems such as an
- phase signal processing method is adapted for a space isolation installation, frequency conversion repeat and a smart antenna
- the repeater is formed of a first receiving public cable unit and a
- the first receiving public cable unit and second receiving public cable unit are identical to the first receiving public cable unit and second receiving public cable unit.
- the local interference signal is removed based on
- the reflection interference signal which is not moved based on the
- transmission signal are second synthesized for thereby removing the
- Each adjusting element is repeatedly adjusted until the quantity of all relativity signals is
- Figure 1 is a view illustrating a concept of a relativity detection according to
- Figure 2 is a graph based on a gain modulation size according to the
- Figure 3 is a view illustrating a haulingless RF signal repeater according to
- Figure 4 is a view illustrating the construction of a simulator according to
- Figure 5 is a view illustrating the construction of a gain modulation unit
- Figures 6A and 6B are graphs illustrating a principle of an interference signal removal according to the present invention.
- Figure 7 is a view illustrating a position of a public cable unit for removing
- Figure 8 is a flow chart of a haulingless RF signal repeating method
- Figure 9 is a flow chart illustrating a perpendicular signal generation step of
- Figure 10 is a flow chart of an interference control signal synthesizing step
- receiving antenna 20 transmission antenna
- balance signal generation unit 130 second receiving public cable unit
- feed back gain detector 150 second simulator
- selection control unit 160 filtering unit
- gain modulation unit 172 gain modulation unit 172:; output protector 174: gain modulator 176: gain detector
- transmission amplifying unit 190 transmission public cable unit
- terminal station fO remote donor base station signal
- n1 local interference signal
- Figure 1 is a view illustrating a relativity detection according to the present
- receiving antenna 10 is modulated and transmitted through a transmission
- the transmission gain is determined based on a feed back gain
- the feed back signal 30 is transmitted through the transmission antenna 20,
- a relativity is measured based on a ratio of the transmission gain and feed
- Figure 2 is a graph based on a gain modulation size according to the
- P represents a power
- T represents time
- Relativity C D2(feed back gain amount)/D1 (transmission gain amount)
- the RF signal repeater repeats a
- Figure 3 is a view illustrating a haulingless RF signal repeater for
- a haulingless RF signal repeater 100 includes a first receiving public cable unit 120 which
- cable unit 130 receives an original signal from a remote donor base station 110
- An original signal transmitted from the remote donor base station 110 is
- public cable unit 190 of a repeater itself receives a signal having a phase
- the balance signal generation unit 125 receives a RF signal received from
- the orthogonal balance signal generation unit 135 delays the phase of the
- the orthogonal balance signal is obtained for the purpose of converting a
- the first simulator 130 and the second simulator 140 synthesize a RF
- orthogonal balance signal generation unit 135 at a certain ratio.
- the selection control unit 155 measures a relativity in a simulator with
- the measured relativity and closes a simulator which has a large relativity.
- the first simulator 140 is opened, the first simulator
- simulator 150 measures a relativity continuously in a closed state.
- the first simulator the first simulator 140 is closed, and the second simulator
- the filter unit 160 is adapted to remove a noise signal which occurs
- the selection control unit 155 is removed through the filter unit 160.
- the gain modulation unit 170 modulates an amplitude of a small feed back
- the transmission amplification unit 180 amplifies a signal for transmitting
- the transmission public signal cable 190 receives a signal amplified by the
- transmission amplification unit 180 and radiates into a free space for
- Figure 4 is a view illustrating the construction of a simulator according to
- the first simulator and the second simulator includes
- the interference control signal synthesizing unit 145 receives a R signal
- an interference signal which is an output signal
- the feed back gain detector 147 detects a feed back gain of a signal which
- Figure 5 is a view illustrating the construction of a gain modulation unit
- the gain modulation unit 170 As shown in Figure 5, the gain modulation unit 170 according to the
- present invention includes an output protector 172, a gain modulator 174 and a gain detector 176.
- the output protector 172 prevents a transmission output and a current gain
- the output protector 172 determines a certain limit of the transmission gain
- the output protector 172 in the case that the gain reaches the limit, the output protector 172
- the gain modulator 174 modulates the amplitude of the RF signal
- the gain detector 176 detects a gain of a signal which is modulated in its
- detector 147 of the simulator are a basis for measuring a relativity.
- Figures 6A and 6B are graphs of an interference signal removing principle
- the RF signal received from the remote donor base station 110 does not a
- the interference signal is formed of a local
- the local interference a 1/2 wavelength of the transmission signal wavelength, the local interference
- the received local interference signal f1 has two times amplitude
- the interference signal received into the first receiving public cable unit 120 is the interference signal received into the first receiving public cable unit 120
- the balance signal generation unit 125 balances a received RF signal
- the interference control signal synthesizing unit 145 synthesizes a RF
- balance signal synthesizing unit 135 at a certain ratio and removes all
- the signals are synthesized at various ratios based on a ratio
- Figure 7 is a view illustrating a position of the public cable unit for removing
- the first receiving public cable unit 120 the second receiving public cable unit 120
- receiving public cable unit and transmission public cable unit 190 are positioned
- the received feed back signal is received into each receiving public cable unit
- public cable unit and transmission public cable unit 190 are connected by a wire
- connection method for thereby receiving a transmission signal based on a wire
- connection method not by the wireless method, so that an accurate orthogonal
- Figure 8 is a flow chart of a haulingless RF signal repeater according to the
- the haulingless RF signal repeating method includes
- a RF signal receiving step S100 an orthogonal signal generating step S200, a
- S500 is fed back for thereby detecting a feed back gain of the RF signal.
- the RF signal In the interference control signal synthesizing step S400, the RF signal
- the signal is amplified in the transmission signal amplifying step S700.
- transmission signal amplifying step S700 is radiated into a free space.
- Figure 9 is a flow chart of an orthogonal signal generating step S200 of a haulingless RF signal repeating step according to the present invention.
- the orthogonal signal generating step S200 includes
- the interference signal extracting step S230 the interference signal
- Figure 10 is a flow chart of the interference control signal synthesizing step
- S400 includes a signal synthesizing step S410 for synthesizing a signal at a
- a relativity measuring step S420 for measuring a relativity of a synthesizing signal for measuring a relativity of a synthesizing signal
- orthogonal balance signal generating step S200 are synthesized.
- relativity measuring step S420 is compared for thereby searching the minimum
- the minimum relativity is selected among the relativity compared in the relativity
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Relay Systems (AREA)
Abstract
A radio relay system using radio frequency, the radio relay system comprising: first receiving anntena part and second receiving anntena part, performs a composition after substract two signals detected by two receiving anntena parts, and after composing three signals having delayed signal of a degree a forth of wavelength from formally composed of two signals and two receiving signals detected by two receiving anntena parts as a rate, and eliminate interference signal of a shot distance of phase and compose secondarily reflection interference signal of delayed, not eliminating by phase method, and transmission signal of inverse phase.
Description
Haulinqless RF Repeater and Method thereof
TECHNICAL FIELD
The present invention relates to a repeater and repeating method of the
same which are adapted in a RF(Radio Frequency) signal, and in particular to a
repeater and repeating method of the same which are capable of repeating a
high level and high purity RF signal by increasing a relativity isolation of a
transmission and receipt of a repeater base station.
BACKGROUND ART
A repeater is disposed between a bast station and a terminal station and is
adapted to amplify a low receiving signal level to a better communication quality
level, so that it is possible to provide a better communication quality for the
interior of a building and an outer area of a city to which a signal does not reach
well, so that in the above area, an intensity of a radio wave is weak.
As the types of repeaters, there are provided an optical repeater,
microwave repeater, variable wave repeater, RF signal repeater, etc.
The RF signal repeater is economical and has a few problems such as an
isolation between transmission and receiving sides and a noise increase in a
base station. There are lots of problems for installing the same.
Therefore, in the conventional art, in order to enhance a relativity isolation
of a repeater base station, a shielding unit of a transmission and receipt public
cable is installed or a phase signal processing method is adapted for a space
isolation installation, frequency conversion repeat and a smart antenna
technology. However, in this case, there is much inconvenience for installing a
shielding unit, and an expensive signal processing apparatus is needed.
DISCLOSURE OF INVENTION
Accordingly, it is an object of the present invention to provide a RF signal
repeater and RF signal repeating method which are capable of effectively
controlling a feed back phenomenon which occurs during a high level
transmission for expanding a service area and improving a quality in a negative
area(to which signals do not well reach) in a RF signal communication.
In order to achieve the above objects, there is provided a repeater using a
RF signal. The repeater is formed of a first receiving public cable unit and a
second receiving public cable unit which receive a RF signal. The signals from
the first receiving public cable unit and second receiving public cable unit are
balanced and synthesized. The orthogonal signal that the balanced signal is
delayed by 1/4 wavelength and the first and second receiving signals are
synthesized at a certain ratio. The local interference signal is removed based on
the phase. The reflection interference signal which is not moved based on the
phase method and is delayed based on time and the transmission signal of the
half phase having a proper time-based delay and size with respect to the
transmission signal are second synthesized for thereby removing the
interference signal relative to the transmission of the repeater. Each adjusting
element is repeatedly adjusted until the quantity of all relativity signals is
minimized with reference to the detection degree of the relativity based on an
output variation and artificial output variation with respect to the ration of signal
synthesizing operation and delay factor. As a result, in the haulingless repeating
method according to the present invention, only the non-relativity signal is
amplified and transmitted.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become better understood with reference to the
accompanying drawings which are given only by way of illustration and thus are
not limitative of the present invention, wherein;
Figure 1 is a view illustrating a concept of a relativity detection according to
the present invention;
Figure 2 is a graph based on a gain modulation size according to the
present invention;
Figure 3 is a view illustrating a haulingless RF signal repeater according to
an embodiment of the present invention;
Figure 4 is a view illustrating the construction of a simulator according to
the present invention;
Figure 5 is a view illustrating the construction of a gain modulation unit
according to the present invention;
Figures 6A and 6B are graphs illustrating a principle of an interference
signal removal according to the present invention;
Figure 7 is a view illustrating a position of a public cable unit for removing
an interference signal according to the present invention;
Figure 8 is a flow chart of a haulingless RF signal repeating method
according to the present invention;
Figure 9 is a flow chart illustrating a perpendicular signal generation step of
a haulingless RF signal repeating method according to the present invention;
and
Figure 10 is a flow chart of an interference control signal synthesizing step
of a haulingless RF signal repeating method according to the present invention.
** Descriptions of reference numerals of major elements of the drawing **
10: receiving antenna 20: transmission antenna
30: feed back RF signal 100: haulingless repeater
110: donor base station 120: first receiving public cable unit
125: balance signal generation unit 130: second receiving public cable unit
135: orthogonal balance signal generation unit
140: first simulator
145: interference control signal synthesizing unit
147: feed back gain detector 150: second simulator
155: selection control unit 160: filtering unit
170: gain modulation unit 172:; output protector
174: gain modulator 176: gain detector
180: transmission amplifying unit 190: transmission public cable unit
200: terminal station fO: remote donor base station signal
f1 : first receiving public cable unit receiving signal
f2: second receiving public cable unit receiving signal
f3: orthogonal balance signal n1 : local interference signal
n2: reflection interference signal
BEST MODE FOR CARRYING OUT THE INVENTION
Figure 1 is a view illustrating a relativity detection according to the present
invention.
As shown therein, in a basic principle for removing a local interference
signal and reflection interference signal of a haulingless repeater according to
the present invention, a RF signal transmission gain received through a
receiving antenna 10 is modulated and transmitted through a transmission
antenna 20, and the transmission gain is determined based on a feed back gain
of a feed back signal 30.
The feed back signal 30 is transmitted through the transmission antenna 20,
and the transmitted signal is received through the receiving antenna 10.
Here, a feed back gain of a RF signal fed back through the feed back gain
detection unit which is adapted to detect a feed back gain of the feed back
signal 30 received through the receiving antenna 10 is detected.
A relativity is measured based on a ratio of the transmission gain and feed
back gain.
It is possible to judged whether a repeat of a RF signal is properly
performed based on a measured relativity.
Figure 2 is a graph based on a gain modulation size according to the
present invention.
As shown in Figure 2, a principle for removing a local interference signal
and reflection interference signal of a haulingless RF signal repeater according
to the present invention will be described using a graph.
Here, P represents a power, and T represents time.
In the case that a gain of D1 is modulated by the transmission gain
modulation unit of Figure 1 and is transmitted, and the gain of D2 is detected by
the feed back detection unit of Figure 1 , the relativity is obtained based on the
following equation.
Relativity C = D2(feed back gain amount)/D1 (transmission gain amount)
Here, it is possible to judge whether a RF signal repeater repeats an
original signal without noise based on a measured relativity C.
Namely, as the relativity C is decreased, the RF signal repeater repeats a
received original signal without distortion due to an interference.
Figure 3 is a view illustrating a haulingless RF signal repeater for
implementing an embodiment of the present invention.
As shown in Figure 3, a haulingless RF signal repeater 100 according to
the present invention includes a first receiving public cable unit 120 which
receives an original signal and interference signal outputted from a donor base
station 110, a balance signal generation unit 125, a second receiving public
cable unit 130, an orthogonal balance signal generation unit 135, a first
simulator 140, a second simulator 150, a selection control unit 155, a filter unit
160, a gain modulation unit 170, a transmission amplification unit 180, and a
transmission public cable unit 190.
The first receiving public cable unit 120 and the second receiving public
cable unit 130 receives an original signal from a remote donor base station 110
and receives a feed back local interference signal n1 of a transmission public
cable unit 190 of a repeater itself and a feed back reflection interference signal
n2 which is reflected by an external object.
An original signal transmitted from the remote donor base station 110 is
received as almost equivalent phase through the first receiving public cable unit
120 and the second receiving public cable unit 130.
Therefore, in the case that the received original signal is synthesized, the
amplitude is increased two times, and in the case that it is balanced, a
characteristic of an offsetting signal is obtained.
In addition, a local interference signal n1 received from the transmission
public cable unit 190 of a repeater itself receives a signal having a phase
difference by a distance that the first receiving public cable unit 120 and the
second receiving public cable unit 130 are distanced.
The balance signal generation unit 125 receives a RF signal received from
the first receiving public cable unit 120 and the second receiving public cable
unit 130 and offsets an original signal of the equivalent phase based on a
balance and synthesizing method and extracts only the inputted interference
signal.
The orthogonal balance signal generation unit 135 delays the phase of the
interference signal extracted by the balance signal generation unit 125 by 1/4
wavelength and generates an orthogonal balance signal.
The orthogonal balance signal is obtained for the purpose of converting a
phase difference generated by a reflection interference between a receiving
signal of the first receiving public cable unit 120 and a receiving signal of the
second receiving cable unit 130 into an inverted phase difference.
The first simulator 130 and the second simulator 140 synthesize a RF
signal received from the first receiving public cable unit 120, the second
receiving public cable unit 130, the balance signal generation unit 125 and the
orthogonal balance signal generation unit 135 at a certain ratio.
The construction of the simulator will be described with reference to Figure
4.
The selection control unit 155 measures a relativity in a simulator with
respect to a gain modulated by the gain modulation unit 170 and performs a
swapping function that opens a simulator which has a small relativity based on
the measured relativity and closes a simulator which has a large relativity.
In the case that the first simulator 140 is opened, the first simulator
synthesizes a received signal at a fixed synthesizing ratio, and the second
simulator 150 measures a relativity continuously in a closed state.
Here, in the case that the relativity of a certain synthesizing ratio of the
second simulator is smaller than the relativity of the fixed synthesizing ratio of
the first simulator, the first simulator 140 is closed, and the second simulator
150 is opened and synthesizes the signal received in such a manner that the
unknown synthesizing ratio is received based on the fixed synthesizing ratio.
The filter unit 160 is adapted to remove a noise signal which occurs
through the simulator and selection control unit 155.
Therefore, the noise signal which is included in the signal outputted from
the selection control unit 155 is removed through the filter unit 160.
The gain modulation unit 170 modulates an amplitude of a small feed back
signal which is not removed through the simulator, using an orthogonal signal
row like a pseudo noise row code which is previously determined and detects a
relativity through from the modulated signal based on an amplitude modulation
ratio with respect to the fed back signal and decreases and increases the
transmission output until the receiving intensity of the orthogonal signal hat
becomes zero.
The construction of Figure 5 will be described.
The transmission amplification unit 180 amplifies a signal for transmitting
an interference signal and a signal from which a noise signal is removed.
The transmission public signal cable 190 receives a signal amplified by the
transmission amplification unit 180 and radiates into a free space for
transmitting to the terminal station 200.
Figure 4 is a view illustrating the construction of a simulator according to
the present invention.
As shown in Figure 4, the first simulator and the second simulator includes
an interference control signal synthesizing unit 145 and a feed back gain
detector 147.
The interference control signal synthesizing unit 145 receives a R signal
received through the first receiving public cable unit 120 and the second
receiving public cable unit 130, an interference signal which is an output signal
of the balance signal generation unit 125 and an orthogonal balance signal
which is an output signal of the orthogonal valance signal generation unit 135
and synthesizes the inputted signals at a certain ratio based on a modulation
degree of the gain modulation unit 170 and a relativity measured based on a
feed back gain measured by the feed back gain detector 147.
The feed back gain detector 147 detects a feed back gain of a signal which
is synthesized trough the simulator.
Figure 5 is a view illustrating the construction of a gain modulation unit
according to the present invention.
As shown in Figure 5, the gain modulation unit 170 according to the
present invention includes an output protector 172, a gain modulator 174 and a
gain detector 176.
The output protector 172 prevents a transmission output and a current gain
based on a RF signal amplification from being increased limitlessly as the
transmission gain is increased limitlessly.
The output protector 172 determines a certain limit of the transmission gain,
and in the case that the gain reaches the limit, the output protector 172
decreases the gain and the transmission output of the RF signal.
The gain modulator 174 modulates the amplitude of the RF signal
transmitted from the repeater by a certain size and modulates the transmission
gain.
The gain detector 176 detects a gain of a signal which is modulated in its
amplitude by a certain size by the gain modulator 174 and is outputted.
The transmission gain and the feed back gain measured by the feed back
detector 147 of the simulator are a basis for measuring a relativity.
Figures 6A and 6B are graphs of an interference signal removing principle
according to the present invention.
The RF signal received from the remote donor base station 110 does not a
certain phase difference with respect to the RF signal received through the first
receiving public cable unit 120 and the second receiving public cable unit 130.
As shown in Figures 6a and 6B, the interference signal is formed of a local
interference signal f1 which is directly received from the transmission public
cable unit of the repeater and an indirect interference signal f2 which is reflected
by an external object and is received.
In the local interference signal f 1 , since a phase difference occurs by the
distance of the public cable unit, if the distance of the public cable unit reaches
a 1/2 wavelength of the transmission signal wavelength, the local interference
signal received from the public cable unit has a difference by the half
wavelength.
Therefore, the received local interference signal f1 has two times amplitude
based on a synthesizing operation, and the amplitude becomes zero in the case
of the balance.
Therefore, the local interference signal f1 received through the first
receiving public cable 120 and the second receiving public cable unit 130
synthesizes a signal and offsets the same.
Since the indirect interference signal is reflected by a neighboring object
and is received, so that it has a certain acute angle.
The interference signal received into the first receiving public cable unit 120
and the second receiving public cable unit 130 has a phase difference(φl ) by an
acute angle of the indirect interference signal.
The balance signal generation unit 125 balances a received RF signal and
extracts an interference signal using the above principle, and the balance signal
generation unit 125 delays the phase of the extracted interference signal by 1/4
wavelength and generates the orthogonal signal f3 and transfers to the
interference synthesizing unit 145.
The interference control signal synthesizing unit 145 synthesizes a RF
signal from the first receiving public cable unit 120, a RF signal received in the
second receiving public cable unit 130, an interference signal of the balance
signal generation unit 125 and an orthogonal balance signal f3 of the orthogonal
balance signal synthesizing unit 135 at a certain ratio and removes all
interference signals which do not have the equivalent phase from the signals
compensated using a phase shift(φ2) based on the orthogonal balance signal
after a synthesizing operation is performed.
At this time, the signals are synthesized at various ratios based on a ratio
for synthesizing the signals inputted into the interference control signal
synthesizing unit 145. The ratio at which the amplitude value is smallest in the
signals which are synthesized at a certain ratio is determined as a synthesizing
ratio.
Therefore, it is possible to continuously trace and remove the interference
signal.
Figure 7 is a view illustrating a position of the public cable unit for removing
the interference signal according to the present invention.
As shown in Figure 7, the first receiving public cable unit 120, the second
receiving public cable unit and transmission public cable unit 190 are positioned
at a distance by 1/2 wavelength of a transmission signal, so that the signal that
the received feed back signal is received into each receiving public cable unit
has an inverted phase.
In addition, the first receiving public cable unit 120, the second receiving
public cable unit and transmission public cable unit 190 are connected by a wire
connection method for thereby receiving a transmission signal based on a wire
connection method, not by the wireless method, so that an accurate orthogonal
balance signal is generated.
The operations of the present invention will be described.
Figure 8 is a flow chart of a haulingless RF signal repeater according to the
present invention.
As shown in Figure 8, the haulingless RF signal repeating method includes
a RF signal receiving step S100, an orthogonal signal generating step S200, a
transmission relativity detection step S300, an interference control signal
generating step S400, a transmission gain modulation step S500, a filtering step
S600, a transmission signal amplification step S700, and a transmission step
S800.
In the RF signal receiving step S100, a RF signal fO which is transmitted
from the donor base station 110, a local interference signal n1 of the
transmission public cable unit 190 of the repeater and the indirect interference
signal n2 which is reflected by an external object are received.
In the orthogonal signal generating step S200, an interference signal is
extracted from the signals received in the RF signal receiving step S100 using a
balance method, and the extracted interference signal is delayed by a 1/4
phase for thereby generating an orthogonal balance signal f3.
The operation will be described in detail with reference to Figure 9.
In the transmission relativity detection step S300, the RF signal which is
modulated to a certain size amplitude in the transmission gain modulation step
S500 is fed back for thereby detecting a feed back gain of the RF signal.
In the interference control signal synthesizing step S400, the RF signal
received in the RF signal receiving step S100 and the orthogonal balance signal
f3
which is generated in the orthogonal signal generating step S200 are received
and synthesized for thereby removing the interference signal.
The operation will be described in detail with reference to Figure 10.
In the transmission gain modulation step S500, the amplitude of a certain
side RF signal is modulated for measuring the relativity.
It is possible to measure the transmission gain of the above step and the
feed back gain of the transmission relativity detection step S300.
In the filtering step, a noise signal is removed through the orthogonal
balance signal generating step and the interference signal synthesizing step for
thereby removing an interference signal.
In the transmission signal amplifying step S700, the signal is amplified in
order to transmit the received signal to the terminal station 200.
In the transmission step S800, the signals amplified through the
transmission signal amplifying step S700 is radiated into a free space.
Figure 9 is a flow chart of an orthogonal signal generating step S200 of a
haulingless RF signal repeating step according to the present invention.
As shown in Figure 9, the orthogonal signal generating step S200 includes
a receiving signal balance step S210, an equivalent phase signal offsetting step
S220, an interference signal extracting step S230, and an interference signal
delay step S240.
In the receiving signal balance step S210, the signal received in the RF
signal receiving step S100 is balanced.
In the equivalent phase signal offsetting step S220, the signal of the
equivalent phase is offset among the signals which pass through the receiving
signal balance step S210.
In the interference signal extracting step S230, the interference signal
which is not offset in the equivalent phase signal offsetting step S220 because
the phase is not equivalent is extracted.
In the interference signal delay step S240, the interference signal extracted
in the interference signal extracting step S230 is delayed by 1/4 wavelength for
thereby generating an orthogonal balance signal f3.
Figure 10 is a flow chart of the interference control signal synthesizing step
of the haulingless RF signal repeating method according to the present
invention.
As shown in Figure 10, the interference control signal synthesizing step
S400 includes a signal synthesizing step S410 for synthesizing a signal at a
certain ratio, a relativity measuring step S420 for measuring a relativity of a
synthesizing signal, a relativity comparison step S430 for comparing the
relativity, a synthesizing ratio selection step S440 for selecting a synthesizing
ratio of the minimum relativity, and a synthesizing ratio maintaining step S450.
In the signal synthesizing step S410, the signal received in the RF signal
receiving step S100 and the orthogonal balance signal generated in the
orthogonal balance signal generating step S200 are synthesized.
In the relativity measuring step S420, a relativity of the signal synthesized
at a certain ratio is measured in the signal synthesizing step S410.
In the relativity comparison step S430, the relativity measured through the
relativity measuring step S420 is compared for thereby searching the minimum
relativity.
In the synthesizing ratio selection step S440, a synthesizing ratio having
the minimum relativity is selected among the relativity compared in the relativity
comparison step S430.
In the synthesizing ratio maintaining step S450, the synthesizing ratio
selected in the synthesizing ratio selection step S440 is continuously
maintained for thereby synthesizing the signal.
As described above, in the present invention, when repeating the signal of
a certain communication band width, it is possible to maintaining a short public
cable distance between the transmission sides by largely decreasing the feed
back gain for thereby constituting a small sized repeater, so that it is possible to
constitute a repeater in a single hardware structure.
Therefore, it is possible to remove lots of interference waves in a city area
in which buildings are intensively provided and a narrow installation area, so
that it is possible to implement a good service in a negative area(to which
signals do not well reach) by simply attaching on a window of a building or a
roof of an apartment building. In particular, it is possible to expand a service
region at a lower cost by attaching to an electric pole or a simple structure with
respect to a service negative area(to which signals do not well reach) such as a
certain road which has a large curve. In addition, an external cable needed for
connecting the public cables between the transmission and receiving sides is
not needed in the present invention, so that it is possible to significantly
decrease the construction cost.
As the present invention may be embodied in several forms without
departing from the spirit or essential characteristics thereof, it should also be
understood that the above-described examples are not limited by any of the
details of the foregoing description, unless otherwise specified, but rather
should be construed broadly within its spirit and scope as defined in the
appended claims, and therefore all changes and modifications that fall within
the meets and bounds of the claims, or equivalences of such meets and bounds
are therefore intended to be embraced by the appended claims.
Claims
1. In a RF(Radio Frequency) signal repeater, a haulingless RF signal
repeater, comprising:
a first receiving public cable unit which receives a RF signal;
a second receiving public cable unit which receives a RF signal like the
first receiving public cable unit;
a first simulator and second simulator which remove an interference
signal included in the signals received through the first receiving public cable
unit and second receiving public receiving unit;
a selection control unit which opens and closes the first simulator and
the second simulator;
a gain modulation unit which modulates a transmission gain of a signal
received from the simulator selected based on the selection control unit;
a transmission amplification unit which amplifies a signal received from
the gain modulation unit; and
a transmission public cable unit which receives and transmits a signal
amplified through the transmission amplification unit.
2. The repeater of claim 1 , wherein said first and second simulators each
include:
an orthogonal balance signal generating unit which balance and
synthesize the signals received trough the first receiving public cable unit and second public cable unit and offset an equivalent phase signal and extract the
interference signals which have different phases and delay the interference
signal by a certain wavelength; and
an interference control signal which receives and synthesizes the
signals from the orthogonal balance signal generating unit and the first receiving
public cable unit and second receiving public cable unit and removes an
interference signal.
3. The repeater of claim 2, wherein said orthogonal balance signal
generating unit is adapted to delay an extracted interference signal by a 1/4
wavelength.
4. The repeater of claim 1 , further comprising:
a filter unit which is adapted to receive a signal from the interference
control signal synthesizing unit and removes a noise signal which occurs when
an interference signal is removed.
5. The repeater of claim 1 , wherein said gain modulation unit includes:
a gain modulator which modulates the amplitude of a received signal to
a certain size; and
a gain detector which detects a feed back gain of a signal that a signal
is modulated through the gain modulator and is received.
6. The repeater of claim 5, further comprising:
an output protector which is adapted to prevent a transmission gain
from being increased limitlessly.
7. The repeater of claim 1 , wherein in said transmission public cable unit,
the first receiving public cable unit and the second receiving public cable unit
are connected at a distance in which the phase is an inverted phase with
respect to a wavelength of the transmission public cable unit.
8. The repeater of claim 1 , wherein said transmission public cable unit is
connected with the first receiving public cable unit and the second receiving
cable unit through a wire for obtaining an accurate orthogonal balance signal.
9. A haulingless repeating method, comprising:
(a) a step in which a signal, reflection interference signal and local
interference signal from a donor base station are received through a first
receiving public cable unit and a second receiving public cable unit;
(b) an orthogonal signal generating step in which a signal received from
the first receiving public cable unit and a signal received through the second
receiving public cable unit are compared for thereby generating an orthogonal
signal; (c) a transmission relativity detection step in which a feed back gain of a
signal received through the first receiving public cable unit and a feed back
signal received through the second receiving public cable unit is detected;
(d) an interference control signal synthesizing step in which an
orthogonal signal is received and is synthesized at a certain ratio;
(e) a transmission gain modulation step in which a signal outputted
through the interference control signal synthesizing step is received and is
modulated to a certain size amplitude;
(f) a transmission amplitude step in which an original signal from which
an interference signal is removed is amplified for transmitting the same; and
(g) a transmission step in which an amplified signal is radiated through
the transmission public cable unit.
10. The method of claim 9, wherein said (b) step includes:
a balance step in which the signals received through the first receiving
public cable unit and second receiving public cable unit are balanced;
an offsetting step in which the signals having an equivalent phase
through the balance step are offset;
an extracting step in which the inference signals which are not offset in
the offsetting step and has different phases are extracted; and
a delay step in which the signal extracted from the extracting step is
delayed by 1/4 wavelength.
11. The method of claim 9, wherein said (d) step includes:
a synthesizing step in which the signal is synthesized at a certain ratio;
a relativity measuring step in which the relativity of the signal
synthesized at a certain ratio is measured;
a relativity comparison step in which the measured relativity are
compared;
a synthesizing ratio selection step in which a synthesizing ratio which
has a minimum relativity is selected through the relativity comparison step; and
a synthesizing ratio maintaining step in which the selected synthesizing
ratio is continuously maintained.
12. The method of claim 9, further comprising:
a filtering step in which a noise signal is removed through the filtering
unit for removing a noise signal generated through the (d) step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2002367606A AU2002367606A1 (en) | 2002-02-04 | 2002-10-11 | Haulingless rf repeater and method thereof |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2002-0006218A KR100462827B1 (en) | 2002-02-04 | 2002-02-04 | Haulingless RF Repeater and Method thereof |
| KR2002/0006218 | 2002-02-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2003067786A1 true WO2003067786A1 (en) | 2003-08-14 |
Family
ID=27725684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2002/001911 Ceased WO2003067786A1 (en) | 2002-02-04 | 2002-10-11 | Haulingless rf repeater and method thereof |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR100462827B1 (en) |
| AU (1) | AU2002367606A1 (en) |
| WO (1) | WO2003067786A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100570180B1 (en) * | 2002-09-14 | 2006-04-13 | 주식회사 컨버시스 | Method and device for preventing re-input signal of wireless repeater using multi-path searcher |
| US8849186B2 (en) | 2009-05-12 | 2014-09-30 | Qualcomm Incorporated | Repeater communication using inserted low power sequences |
| KR101716248B1 (en) | 2015-12-23 | 2017-03-15 | 현대자동차주식회사 | Audio apparatus, vehicle having the same and control method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05241582A (en) * | 1992-02-28 | 1993-09-21 | Nec Corp | Noise canceler |
| WO1997018640A1 (en) * | 1995-11-14 | 1997-05-22 | Paradyne Corporation | Echo cancellation for modems |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6125109A (en) * | 1998-02-24 | 2000-09-26 | Repeater Technologies | Delay combiner system for CDMA repeaters and low noise amplifiers |
| KR100294126B1 (en) * | 1998-11-10 | 2001-07-12 | 이철호 | Apparatus and method for removing polarization interference of orthogonal polarization |
| JP2000324033A (en) * | 1999-05-10 | 2000-11-24 | Mitsubishi Electric Corp | Same frequency relay method and apparatus |
| KR20010001092A (en) * | 1999-06-01 | 2001-01-05 | 구관영 | Interference Cancellation System of Repeater by using Dual Polarization Antenna |
| JP3603714B2 (en) * | 2000-01-06 | 2004-12-22 | Ｋｄｄｉ株式会社 | Repeater device for code division multiple access system |
-
2002
- 2002-02-04 KR KR10-2002-0006218A patent/KR100462827B1/en not_active Expired - Fee Related
- 2002-10-11 WO PCT/KR2002/001911 patent/WO2003067786A1/en not_active Ceased
- 2002-10-11 AU AU2002367606A patent/AU2002367606A1/en not_active Abandoned
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05241582A (en) * | 1992-02-28 | 1993-09-21 | Nec Corp | Noise canceler |
| WO1997018640A1 (en) * | 1995-11-14 | 1997-05-22 | Paradyne Corporation | Echo cancellation for modems |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2002367606A1 (en) | 2003-09-02 |
| KR100462827B1 (en) | 2004-12-17 |
| KR20030066062A (en) | 2003-08-09 |
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