KR100419929B1 - A digital to analog optical repeating system for an in-building - Google Patents

Abstract

The present invention relates to an indoor optical relay system configured to perform stable relaying of high-speed, large-capacity data to solve indoor shadow areas, and includes: a main donor for selectively processing one sector signal per branch; And a plurality of sub-donors connected one-to-one to each branch and connected to a plurality of remotes, respectively, for transmitting a digital optical signal between the main donor and the sub-donor, and each of the sub-donors and their respective sub-donors A plurality of remotes connected to are connected to one optical line, and the one optical line is provided with an optical splitter for mixing and distributing analog optical signals having different wavelengths in the downstream and the plurality of upstreams, thereby providing a main donor and a sub Transmitting digital optical signals between donors and analog optical signals within buildings to achieve efficient system configuration and stable relay services, and to transfer high-speed and large-capacity data of 2.5G and 3G services to repeaters in buildings. It will eliminate the shaded area.

Description

A digital to analog optical repeating system for an in-building}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical relay system, and more particularly, to an optical relay system employing a digital optical transmission method between a main donor and a sub donor in an 2.5G and 3G system, and using an indoor optical transmission method for indoor transmission.

In the conventional light distribution system for indoor (In-building), as shown in Fig. 1, the base station 10 and the main donor 12 (Main Donor 12) is primarily connected to 1: 1. Then, the four sub-donors 14 to 17 from the sub donor # 1 to the sub donor # 4 are connected to the main donor 12 using the optical path.

In some cases, a system configuration in which the base station 10 and the sub donor # 1 14 are directly connected without using an optical path is possible. In addition, up to eight remotes from the remote # 1 to the remote # 8 are connected to each of the sub-donors 14 to 17 by the optical path.

In most configurations the sub donors 14-17 and remotes are installed in a building. Here, in the conventional system, the main donors 12 and the sub donors 14 to 17 are interconnected by an analog optical transmission method. In addition, each of the sub-donors 14 to 17 and the remotes also transmit signals in an analog optical transmission scheme. Two beams are used to connect this sub-donor and remote.

The process from the base station 10 until the signal is transmitted to the subscribers in the building will be briefly described. First, the signal applied from the base station 10 to the main donor 12 is received at the main donor 12. Up to four signals are distributed and converted into analog optical signals and applied to the sub-donors 14 to 17 through the optical path.

Accordingly, each sub donor 14 to 17 distributes the RF signal obtained by photoelectric conversion of the received analog optical signal into up to eight RF signals. The divided signals are converted into analog optical signals through an all-optical process and transmitted to the remotes through the optical path. Each remote converts the received analog optical signal into an RF signal and delivers it to the subscriber through an antenna.

As shown in FIG. 2, a conventional main donor performing such processes includes a DIV / COM unit 20 including an RF divider 22 and an RF combiner 24; MROU (Main Donor RF Optic Unit) 30 which is composed of forward signal amplifier 32, all-optical / photoelectric converter 34, wavelength division multiplexer 36 (hereinafter referred to as WDM unit), and reverse signal amplifier 38 Is made of. Since the signal is transmitted from the main donor 12 to up to four sub-donors, the MROU 30 is configured of up to four MROUs.

When the conventional main donor 12 configured as described above describes a down stream process of transmitting a signal received from the base station 10 to the sub donor, as follows. First, the forward signal, which is the RF signal coming from the base station 10, is divided into four RF signals by using the 1: 4 RF divider 22 (or splitter) in the DIV / COM unit 20. These RF signals are signals that are delivered to each sub donor, which passes through each MROU 30, and the processing in each MROU 30 is the same. The following describes the processing in the first MROU 30 that delivers the RF signal to the first sub donor 14.

Since the RF signal is attenuated while passing through the RF divider 22 of the DIV / COM unit 20, the forward signal amplifying unit 32 in the MROU 30 amplifies the RF signal. The attenuator is then adjusted to the appropriate level for the system. The adjusted signal is subjected to all-optical conversion while going through the all-optical conversion section of the all-optical / photoelectric conversion section 34.

The output optical signal is an analog optical signal, and the analog optical signal is transmitted to the WDM unit 36. In this case, since the wavelengths of the forward signal λ1 and the reverse signal λ2 are transmitted and received by one optical path, the WDM unit 36 serves to process two optical signals (the forward signal wavelength λ1 at this time is 1550 nm and Reverse signal wavelength λ 2 is 1310 nm). That is, the analog optical signal is transmitted to the sub donor # 1 14 through the optical path through the WDM unit 36.

On the contrary, an upstream process, which is a process of backward signal coming from sub donor # 1 14, is as follows. The analog optical signal λ2 applied by the sub donor # 1 14 is extracted through the WDM unit 36 of the MROU 30 and the reverse signal component is extracted and transferred to the all-optical / photoelectric conversion unit 34. The reverse signal component is photoelectrically converted through the photoelectric conversion section of the all-optical / photoelectric conversion section 34. Since the converted RF signal has a low signal level, the reverse signal amplification section 38 is amplified to an appropriate level signal. As in the forward signal amplifier 32, an attenuator is adjusted to an appropriate level suitable for the system.

In this process, signals from other sub-donors, namely, sub-donors # 2, # 3, and # 4, are also applied to the DIV / COM unit 20 through the same in each MROU. Accordingly, the four RF signals are combined into one signal and transmitted to the base station 10 by the 4: 1 RF combiner 24 of the DIV / COM unit 20.

3 is a view showing the configuration of a conventional sub-donor, the conventional sub-donor is a WDM unit 40, an all-optical photoelectric conversion unit 42, a forward signal amplifier 44, a reverse signal amplifier 46, RF A DIV / COM unit 48, a sub-donor RF optic unit (SROU) 50, and an all-optical / photoelectric conversion unit 52 including a divider and an RF combiner are provided. Since the signal is transmitted from the one sub-donor to up to eight remotes, the SROU 50 is composed of four SROUs.

A down stream process in a sub donor for transmitting a signal of the main donor 12 to a remote will be described below. First, the WDM unit 40 extracts an analog optical signal having a wavelength of 1 from the main donor 12. The analog optical signal having a wavelength of λ1 is photoelectrically converted into an RF signal in the photoelectric conversion section of the all-optical / photoelectric conversion section 42. Since the converted RF signal is at a low level, the signal of the RF signal is forwarded by the forward signal amplifier 44. After raising the level, use an attenuator to set the proper level for your system.

The RF signal adjusted to the appropriate level is branched into four RF signals by the 1: 4 RF divider of the DIV / COM unit 48. The branched RF signals are applied to four SROUs 50. Each SROU 50 performs the same operation and generates signals to be transmitted to two remotes in one SROU, so that up to eight remotes can be connected.

The RF signal transmitted to the SROU 50 is subjected to the forward signal amplification / DIV unit 51, and the signal amplification and level adjustment are performed and branched into two RF signals using a 1: 2 divider. Each branched RF signal is all-optically converted through the all-optical converters # 1 and # 2 of the all-optical / photoelectric conversion unit 52, and the converted analog optical signals are transmitted to the remotes # 1 and # 2. Here, two optical paths are used to transmit and receive a signal to one remote.

On the contrary, the upstream process in the sub-donor transferring the signal applied from each remote to the main donor 12 is as follows. Analog optical signals from two remotes (eg, remotes # 1 and # 2) are photoelectrically converted through photoelectric converters # 1 and # 2 of the all-optical / photoelectric conversion unit 52, and the converted RF signals are SROU ( 50 are merged through the reverse signal amplification / COM unit 53, and signal amplification and level adjustment are performed. Each SROU 50 processes the signal in the same operation, and the processed maximum of four signals become one RF signal through the 4: 1 RF combiner of the DIV / COM unit 48.

One RF signal output from the RF combiner is signal amplified and level adjusted by the reverse signal amplifier 46 and applied to the all-optical / photoelectric converter 42. The all-optical / photoelectric conversion section 42 converts the input RF signal in the reverse direction into an analog optical signal having a wavelength of? 2 using an all-optical converter. An analog optical signal having a wavelength of λ 2 is transmitted to the main donor 12 through the optical path through the WDM unit 40.

The base station signal may be directly connected to the sub donor without passing through the main donor 12. In FIG. 3, the DIV / COM unit 48 uses the RF switches # 1 and # 2 to the base station 10 without being transmitted and received to the forward signal amplifier 44 and the reverse signal amplifier 46. Transfer the line so that it can send and receive directly. In other words. The RF SW (switch) # 1 of FIG. 3 is transferred to the base station 10 to receive the forward signal, and the RF SW (switch) # 2 is transferred to the base station 10 to transmit the reverse signal.

On the other hand, the conventional remote is connected to the sub-donor, as shown in Figure 4, the remote is an all-optical / photoelectric conversion unit 60, forward amplification / conversion unit 62, reverse amplification / conversion unit 64, HPA (High Power Amplifier) 66, Low Noise Amplifier (LNA) 68, and Duplexer 70. The remote processes two signals using the two optical paths.

In the processing of the signal, first, the forward analog optical signal applied from the sub-donor is photoelectrically converted by the photoelectric conversion unit of the all-optical / photoelectric conversion unit 60, and the converted forward analog RF signal is the forward amplification / conversion unit. Amplified through 62. Then, a signal of a desired band is output through a band pass filter (BPF) which is a forward filter. This signal is amplified again in the HPA 66 to be a signal sufficient for antenna radiation. Then, the antenna is passed through the duplexer 70 having a function of blocking the mutual influence of the forward signal and the reverse signal. Accordingly, the RF signal is wirelessly transmitted to the subscriber terminal via the antenna.

On the contrary, since the RF signal applied through the antenna in the subscriber station includes various noise components, the duplexer 70 filters the reverse signal and amplifies it through the LNA 68 having good noise characteristics. This amplified signal is filtered in the desired band by the reverse amplification / conversion section 64 and amplified again. Finally, the all-optical conversion unit of the all-optical photoelectric conversion unit 60 is all-optically converted and transmitted to the sub-donor.

As described above, the indoor light scattering system of the related art uses an analog light transmission method for all sections, and thus it is difficult to sufficiently secure a dynamic range. In addition, the provision of good transmission quality required for high speed data processing in 2.5G and 3G is a problem. In addition, since the transmission between the sub-donor and the remote is an analog system using an analog optical signal, the signal is deteriorated because it is processed through amplification and distribution. In addition, by using two optical lines for the remote, the network configuration is complicated and the installation cost of the optical lines in the building is high. For this reason, service needs to be improved through improved equipment installation or maintenance.

The present invention has been proposed to solve the above-mentioned problems. In order to solve the shadow area indoors by performing stable relaying of high speed and large data in 2.5G and 3G systems, a digital optical transmission method between the main donor and the sub donor is used. It is an object of the present invention to provide an indoor optical relay system employing an indoor optical transmission system.

1 is a block diagram of a conventional indoor light distribution system,

2 is a configuration diagram of the main donor shown in FIG.

3 is a configuration diagram of the sub-donor shown in FIG. 1,

4 is a configuration diagram of a remote shown in FIG. 1;

5 is a block diagram of an indoor optical relay system according to an embodiment of the present invention,

6 is a configuration diagram of the main donor shown in FIG.

7 is a configuration diagram of the signal processing unit shown in FIG. 6;

8 is a configuration diagram of a sub-donor shown in FIG. 5,

9 is a configuration diagram of a signal processing unit shown in FIG. 8;

10 is a configuration diagram of the frequency combiner / splitter unit shown in FIG. 8;

11 is a configuration diagram of a remote shown in FIG. 5;

12 is a view showing an example in which the indoor optical relay system according to an embodiment of the present invention is applied,

13 is a view showing another example in which the indoor optical relay system according to an embodiment of the present invention is applied.

※ Explanation of code for main part of drawing

10: base station 12: main donor

14-17: Sub donor 20: DIV / COM part

30: MROU (Main Donor RF Optic Unit) 40, 80: Wavelength Division Multiplexing Unit (WDM Unit)

50: Sub-donor RF Optic Unit (SROU) 60: all-optical photoelectric conversion unit

70: duplexer 81: digital optical transponder

90: digital signal unit 100: signal processing unit

110: frequency combiner / splitter unit

120, 140, 160, 180: Analog Optical Transponder

130, 150, 170, 190, 210, 250: WDM coupler

200: optical splitter 220, 260: optical transponder

230, 270: RF unit 240, 280: 2-way combiner / splitter

In order to achieve the above object, an indoor optical relay system according to a preferred embodiment of the present invention, the main donor for selectively processing one sector signal per branch; And a plurality of sub-donors connected one-to-one to each branch and connected to a plurality of remotes, respectively, for transmitting a digital optical signal between the main donor and the sub-donor, and each of the sub-donors and their respective sub-donors A plurality of remotes connected to each other are connected to one optical line, and the one optical line is provided with an optical splitter for mixing and distributing analog optical signals having different wavelengths in the downstream and the plurality of upstreams.

Hereinafter, an indoor optical relay system according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

5 is a block diagram of an indoor optical relay system according to an embodiment of the present invention, comprising: a main donor 12 connected to a base station 10; A plurality of sub-donors 14 to 17 connected to the main donor 12 through one optical line; Each sub-donor is composed of a plurality of remotes connected using one optical line by analog optical transmission.

The main donor 12 converts the RF signal applied from the base station 10 into an electrical digital signal and applies it to the plurality of sub-donors 14 through 17 as an optical optical signal through an optical line. That is, up to four branches may be connected to the main donor 12, and one branch may be selectively processed for each branch, and each branch may receive a signal transmitted as a digital optical signal. Each sub donor is connected.

The number of expandable sub donors is four and is located in the building. The sub donor is connected to the remote in a 1: 2 connection according to the number of shaded areas in the building. At this time, the maximum number of remote is eight, and the corresponding sub-donor is transmitted as an analog optical signal and becomes a WDM system using one optical fiber. The remotes are located on the floor in the building of the shaded area, and each remote is again connected to two antenna units (AU) to cover the shaded areas of each floor.

FIG. 6 is a configuration diagram of the main donor shown in FIG. 5. The main donor selects one sector signal among the?,?,? Sector signals of the RF signal applied from the base station 10 for each branch, and divides each sector signal into signals for each FA (four FA signals). An RF signal distribution / summer 71 for summing the input FA signals for each sector of each branch into one signal and transmitting the sum signal to the base station 10; The RF signal divider / adder 71 converts the FA-specific analog signal at the downstream to a digital signal, and converts the digital signal for the FA at the time of the up-stream input into an analog signal to divide / add the RF signal. A signal processing unit 73 provided for each branch applied to the unit 71; The signal processing unit 73 combines the FA-specific digital signals applied downstream from the signal processing unit 73 and separates the electric digital signals inputted upstream into the FA-specific signals of the corresponding sector. A digital signal unit 75 installed for each branch applied to the network; All-optical conversion of the electrical digital signal of the corresponding sector in the downstream applied from the digital signal unit 75, photoelectric conversion of the digital optical signal of the corresponding sector in the upstream input to the digital signal unit 75 An optical transponder 77 installed for each branch to be applied to the branch; And transmitting the digital optical signal for each sector in the downstream which is output from the optical transponder 77 to the sub donor of the corresponding branch, and transmitting the digital optical signal for each sector in the upstream which is input in the sub donor. A wavelength division multiplexing coupler 79 is provided for each branch transmitted to the optical transponder 77.

The RF signal distributor / adder 71 is an RF signal distributor 71a for distributing RF signals into a plurality of FA signals for each sector, and an RF signal adder 71b for summing FA signals of each sector into one signal. The RF signal distribution unit 71 may select and distribute a plurality of sector signals instead of selecting only one sector signal among the?,?, And? Sector signals.

The digital signal unit 75 includes a digital signal scrambler (DSS) 75a for combining digital signals for each FA in the downstream, and an electrical digital signal for the FA in the corresponding sector. It consists of a Digital Signal Descrambler (DSD) 75b that separates the signals into signals.

The optical transponder 77 is composed of an all-optical converting unit 77a for all-optically converting an electrical digital signal in the downstream, and a photoelectric converting unit 77b for photoelectrically converting the digital optical signal in the upstream. .

Referring to the operation of the main donor configured as described above is as follows.

First, a down stream process applied from a main donor to a sub donor of each branch is described as follows. The operation of processing the signal (that is, the? Sector signal) applied to the sub donor # 1 will mainly be described. When the RF signal distribution unit 71a of the RF signal distribution / summer 71 receives an RF signal applied from the base station 10, selects one sector signal among α, β, and 하고 and selects the selected sector signal. (I.e., alpha sector signal) is divided into signals for each FA (i.e., four FA signals) and applied to the signal processing unit 73. The signal processing unit 73 converts the input FA signal into a digital signal, and in the digital signal scrambler 75a of the digital signal unit 75, analog / digital converted signals for each FA (that is, Digital signals of the same sector) are combined, and the all-optical conversion unit 77a of the optical transponder 77 converts the input electric digital signal for each FA into a digital optical signal having a wavelength of 1310 nm. The digital optical signal for each FA output from the all-optical conversion unit 77a is transmitted to the corresponding sub donor (ie, sub donor # 1) through the wavelength division multiplexing (WDM) coupler 79 and the optical line.

During sector expansion, sector extension # 1 (for β), sector extension # 2 (for expansion), and sector extension # 3 (for expansion) are installed to transmit a predetermined sector signal for each branch.

On the contrary, an upstream process for processing signals coming from the sub-donors will be described below. The digital optical signal applied from the sub donor # 1 is an alpha sector signal. This signal is photoelectrically converted by the photoelectric conversion section 77b of the optical transponder 77 via the WDM coupler 79. The wavelength at this time is 1550 nm. The converted electrical digital signal is separated into FA-specific signals of the corresponding sector (ie, α sector) in the digital signal descrambler 75b of the digital signal unit 75. The separated FA signals are applied to the signal processing unit 73, and the signal processing unit 73 digitally / analog converts the input FA signals. Thereafter, the RF signal adder 71b of the RF signal divider / adder 71b combines the signals for each FA converted into analog signals into one sector signal (i.e.,? Sector signal). Further, the β, 는 signal is obtained through the same process in sector extension # 1 (for), sector extension # 2 (for), and sector extension # 3 (for expansion), and the α, β, Υ signal is the RF signal. It is added by the adder 71b and applied to the base station 10.

FIG. 7 is a configuration diagram of the signal processing unit illustrated in FIG. 6, which includes a Main Up Converter Unit (MUCU), a Main A / D Converter Unit (MADCU), a Digital Filter Unit (DFU), and a Main D / A Converter Unit (MDACU). A main FA processor configured as a main down converter unit (MDCU); And a diversity FA processing unit including a diversity D / A converter unit (DDACU) and a diversity down converter unit (DDCU).

In FIG. 7, each sector consists of a main 4FA in the downstream and a main 4FA and a diversity 4FA in the upstream. Since one board of the signal processing unit processes the downstream main 1FA, the upstream main 1FA, and the diversity 1FA, four boards are configured for each sector.

Referring to one main FA processing operation in the downstream process, first, the signal input from the RF signal distribution unit 71a of the RF signal distribution / summer 71 is a signal that meets the input condition of the MADCU at a later stage in the MUCU. Is changed to This signal is analog-digital converted in the MADCU, and the parallel signal digitally converted in the DFU is made into a serial signal and then applied to the digital signal unit 75.

On the contrary, when the main FA processing operation in the upstream process is described, as the digital signal separated for each FA in the digital signal unit 75 is applied to the DFU, the DFU converts the input FA digital signal into a parallel digital signal. The MDACU converts the input parallel FA-specific digital signal into an analog signal.

The FA-specific analog signal is converted into a signal matching the RF interface condition in the MDCU and applied to the RF signal summing unit 71b of the RF signal distribution / summing unit 71. The diversity FA portion also undergoes the same processing as described above.

In FIG. 7, the frequency synthesizer unit (FSU) generates a frequency, and the DDCU supplies power.

FIG. 8 is a configuration diagram of the sub donor shown in FIG. 5. The sub donor receives and outputs a digital optical signal from the main donor through one optical line, and transmits the digital optical signal at the time of input upstream to the main donor through one optical line. 80; Photoelectric conversion of the digital optical signal from the WDM coupler 80 into an electrical digital signal, and outputting the optical signal from the WDM coupler 80 to the digital optical signal. Digital optical transponder 81; The digital signal from the digital optical transponder 81 is separated and output for each FA, and the electrical digital signal for each FA in the upstream input is combined into the same sector signal and applied to the digital optical transponder 81. Digital signal unit 90; The FA digital electrical signal from the digital signal unit 90 is converted into an analog signal and outputted, and the electric analog signal for each FA in the upstream input is converted into a digital signal to the digital signal unit 90. A signal processing unit 100 to be applied to the; After combining the electrical analog signals for each FA from the signal processing unit 100 into one, splitting them to a plurality of remote sides, and combining the analog electrical signals for each FA during upstream inputted by photoelectric conversion into one and then FA. A frequency combiner / splitter unit (110) which is separated again for each signal and applied to the signal processing unit (100); The FA-specific analog electrical signal split from the frequency combiner / splitter unit 110 is converted into an all-optical output, and the analog combiner outputs the analog optical signals from the plurality of remote sides. A plurality of analog optical transponders 120, 140, 160, 180 for transmitting to 110; And are respectively connected to the respective analog optical transponders 120, 140, 160, 180, and transmit analog optical signals from the respective analog optical transponders 120, 140, 160, 180 to the remote, the remote A plurality of WDM couplers (130, 150, 170, 190) are provided for transmitting analog optical signals from the respective analog optical transponders (120, 140, 160, 180).

The digital optical transponder 81 is a photoelectric conversion unit 82 for photoelectric conversion of the digital optical signal in the downstream input from the WDM coupler 80, and the electro-optical conversion of the electrical digital signal in the upstream input The all-optical conversion part 84 is provided.

The digital signal unit 90 is a digital signal descrambler (DSD) 92 for separating the electrical digital signal in the downstream into signals for each FA of the corresponding sector, and the FA in the upstream. A digital signal scrambler (DSS) 94 for coupling a star digital signal is provided.

The analog optical transponder 120 includes an all-optical conversion unit 122 for converting the analog electrical signal in the downstream into an analog optical signal, and a photoelectric conversion unit for converting the analog optical signal in the upstream into an analog electrical signal. 124 is provided. The other analog optical transponders 140, 160, 180 also have an all-optical and photoelectric converter as in the analog optical transponder 120 described above.

The overall operation of the sub-donor configured as described above is as follows.

First, the operation during the down stream of the sub donor will be described. The WDM coupler 80 receives a digital optical signal from a main donor having a wavelength of 1310 nm and applies it to the digital optical transponder 81, and the photoelectric conversion unit 82 of the digital optical transponder 81 performs photoelectric conversion. To apply the digital electrical signal to the digital signal unit 90. In the digital signal descrambler 92 of the digital signal unit 90, the input digital electrical signal is separated for each FA and applied to the signal processing unit 100, and the signal processing unit 100 receives the input FA digital. The electrical signal is converted into an analog electrical signal for each FA.

Since the digital / analog conversion is performed for each FA, the frequency combiner / splitter unit 110 uses a 4: 1 RF combiner to transmit 4 FAs to each remote. Combine (4 FA) into one, and then pass through 1: 4 RF splitter to transmit in four directions. Each transmitted signal (i.e., analog electric signal) is all-optically converted into an analog optical signal having a wavelength of 1310 nm in an all-optical conversion unit of each analog optical transponder 120, 140, 160, 180, and each WDM coupler ( 130, 150, 170, and 190 are carried on one optical path and transmitted to the corresponding remote. At this time, an optical splitter is used between the sub-donor and the remote, and two remotes are connected to one sub-donor.

On the contrary, when the upstream operation of the sub donor is described, the optical analog signals of the 1540 nm and 1550 nm wavelengths transmitted from the remote # 1 and the remote # 2 are respectively WDM couplers 130, 150, 170, Photovoltaic conversion of the analog optical transponders 120, 140, 160, 180 through photovoltaic is then applied to the frequency combiner / splitter unit 110. The frequency combiner / splitter unit 110 combines them using a 4: 1RF combiner and separates them by FA through a FA-specific separation filter and then applies them to the signal processing unit 100. The signal processing unit 100 performs analog / digital conversion for each FA and applies an electric digital signal to the digital signal unit 90. Accordingly, the digital signal scrambler 94 of the digital signal unit 90 combines the input electrical digital signal into the same sector (α sector, β sector, and Υ sector) signal and applies it to the digital optical transponder 81. . The all-optical conversion unit 84 of the digital optical transponder 81 converts the input electrical digital signal into a digital optical signal (1550 nm) sent to the main donor. Then, the converted digital optical signal is transmitted to the optical line after passing through the WDM coupler 80.

FIG. 9 is a configuration diagram of the signal processing unit illustrated in FIG. 8, wherein the signal processing unit includes a Main Up Converter Unit (MUCU), a Main A / D Converter Unit (MADCU), a Digital Filter Unit (DFU), and a MDACU (Main D). Main FA processing unit consisting of / A Converter Unit), MDCU (Main Down Converter Unit); And a diversity FA processing unit including a diversity D / A converter unit (DADCU) and a diversity down converter unit (DDCU).

In FIG. 9, each sector is composed of a main 4FA when it is downstream, and is composed of a main 4 FA and a diversity 4 FA when it is upstream.

One board of the signal processing unit processes the downstream 1FA, the upstream main 1FA, and the diversity 1 FA. Thus, the signal processing unit is composed of four boards for each sector.

Referring to one main FA process in the downstream process of the signal processing unit, the signal input separately for each FA in the digital signal unit 90 is first converted into a signal matching the input condition of the MDACU in the DFU. This signal is applied to the frequency combiner / splitter unit 110 after D / A conversion in the MADCU.

On the contrary, in the main FA processing process of the upstream process, the signal separated for each FA in the frequency combiner / splitter unit 110 is changed into a signal corresponding to the input condition of the MADCU in the MUCU. This signal is A / D-converted in MADCU, and digitally converted parallel signal is made into serial signal through DFU. This signal is applied to the digital signal unit 90. The diversity FA section will do the same.

In FIG. 9, the frequency synthesizer unit (FSU) generates a frequency, and the DDCU supplies power.

FIG. 10 is a configuration diagram of the frequency combiner / splitter unit shown in FIG. 8, wherein the frequency combiner / splitter unit is an FA-specific analog electric signal inputted from the signal processing unit 100 (ie, 4 FAs). Combiner 112 for combining the analog electrical signal into one signal; A splitter 114 for dividing one signal output from the combiner 112 into a predetermined number (for example, four) of RF signals; A combiner 116 for combining the analog signals input by photoelectric conversion from the plurality of analog optical transponders 120, 140, 160, and 180 into one signal; And a FA-specific separation filter 118 for separating one signal output from the combiner 116 for each FA and applying it to the signal processing unit 100.

Referring to the operation of the down stream process in the frequency combiner / splitter unit having the above-described configuration, the analog signal inputted by D / A conversion for each FA in the signal processing unit 100 of the sub-donor is 4 The signal is combined into one signal at a: 1 combiner 112 and then divided into four RF signals by a 1: 4 splitter 114. The four RF signals are applied to an all-optical converter of each of the analog optical transponders 120, 140, 160, 180 for transmission as an analog optical signal to a remote located in the shaded area. The reason for using the 4: 1 combiner 112 and the 1: 4 splitter 114 is to send all 4FA to the remote.

Referring to the operation of the upstream process in the frequency combiner / splitter unit having the above configuration, the photoelectric conversion unit in the photoelectric conversion units of the four analog optical transponders 120, 140, 160 and 180 is described. The input RF signal is combined into one signal in the 4: 1 combiner 116 and then separated by FA by the FA-specific separation filter 118 and applied to the signal processing unit 100.

FIG. 11 is a diagram illustrating the configuration of the remote illustrated in FIG. 5. Since two remotes (ie, remote # 1 and # 2) are connected to one sub-donor, the configuration of two identical remotes is illustrated in FIG. 11.

An optical splitter 200 is installed between the one sub-donor and the two remotes. The optical splitter 200 sends analog optical signals (wavelength 1310 nm) from the sub donor to the two remote sides when downstream, and analog optical signals (wavelengths 1540 nm and 1550 nm) from the two remotes upstream. Is sent to the one sub donor.

Since the configurations of the two remotes are the same, the configuration of the remote # 1 will be described.

The remote # 1 receives an analog optical signal (wavelength 1310 nm) from the corresponding sub-donor input by the optical splitter 200 and transmits the analog optical signal at the time of input upstream to the sub donor. Coupler 210; An optical transponder 220 that photoelectrically converts an analog optical signal at the downstream from the WDM coupler 210, converts the RF signal at the upstream input to the WDM coupler, and applies it to the WDM coupler 210; RF that amplifies / levels an analog electric signal (ie, an RF signal) input from the optical transponder 220, outputs it as a transmission signal, and amplifies / levels the received signal during upstream input. Part 230; The transmission signal output from the RF unit 230 is divided into two signals and output to a plurality (ie, two) antenna units, and a plurality (ie, two) RF inputs from the plurality of antenna units And a two-way combiner / splitter 240 that combines the signals into one signal and applies them to the RF unit 230.

The optical transponder 220 is composed of a photoelectric conversion unit 222 for photoelectric conversion of the input analog optical signal, and an all-optical conversion unit 224 for all-optical conversion of the input analog electric signal.

The RF unit 230 includes a forward signal amplifier 231 for amplifying a forward analog electric signal input from the photoelectric converter 222; An HPA 232 which amplifies the signal output from the forward signal amplifier 231 again to a level of a signal sufficient for antenna radiation; A duplexer 233 which blocks mutual influence of the forward signal and the reverse signal; An LNA 234 for amplifying a reverse signal input through the duplexer 233; And a reverse signal amplifying unit 235 which amplifies the reverse signal output from the LNA 234 again and applies it to the all-optical converter 224.

On the other hand, the remote # 2 also performs the same function as the components of the remote # 1, that is, WDM coupler 250, optical transponder 260, RF unit 270, two-way combiner / The splitter 280 is provided.

Referring to the downstream process of the remote configured as described above, in the downstream, an analog optical signal having a wavelength of 1310 nm is transmitted to the remote # 1 and the remote # 2 through the optical splitter 200 in one sub-donor. do. The 1310 nm wavelength optical signal (analog optical signal) received by the remote # 1 is photoelectrically converted by the photoelectric conversion unit 222 of the optical transponder 220 through the WDM coupler 210 to forward signal of the RF unit 230. The amplifier is applied to the amplifier 231. The RF signal amplified by the forward signal amplification unit 231 and re-amplified by the HPA 232 through the duplexer 233 which separates the RF transmission / reception signal is passed through the two-way combiner / splitter 240. It is separated into two RF signals and transmitted to two antenna units (AU # 1, # 2), respectively. The 1310 nm wavelength optical signal (analog optical signal) received by the remote # 2 passes through the WDM coupler 250 and is photoelectrically converted by the photoelectric conversion unit 262 of the optical transponder 260 to be RF unit 270. Is applied. The operation in the RF unit 270 is the same as the operation in the RF unit 230 described above, and two RF signals passing through the RF unit 270 and the two-way combiner / splitter 280 are antenna units. Are sent to (AU # 3, # 4) respectively.

On the contrary, when describing the upstream process at the remote, after the two RF signals input from the antenna units (AU # 1, # 2) are combined into one signal in the two-way combiner / splitter 240 The duplexer 233 of the RF unit 230 receives a reverse reception signal. The reverse reception signal is amplified by a predetermined level in the LNA 234, which is an amplifier having a good noise characteristic, and then reversed by the reverse signal amplifier 235. It is adjusted to an appropriate level. The reverse signal (ie, analog electric signal) output from the reverse signal amplifying unit 235 is all-optical converted into an analog optical signal having a wavelength of 1540 nm by the all-optical converting unit 224 of the optical transponder 220, and then It is transmitted to the sub donor through the WDM coupler 210. In addition, the two RF signals input from the antenna units AU # 3 and # 4 also undergo the same process as the above-described RF signal processing of the antenna units AU # 1 and # 2. The all-optical conversion unit 264 of the wavelength is all-optical conversion into an analog optical signal of 1550nm and then transmitted to the sub-donor through the WDM coupler 250.

12 is a view showing an example in which the indoor optical relay system according to an embodiment of the present invention is applied.

The signal of the base station 10 is converted into a digital signal through the main donor 12, and then converted into an all-optical signal, and then transmitted as a digital optical signal to a sub-donor located in a building where a shadow area exists. The sub-donor transmits the digital light signal through photoelectric conversion, analog conversion, and all-optical conversion to a remote located in each layer where a shadow area exists, using a single optical fiber. The remote, which receives the analog optical signal, performs photoelectric conversion and outputs it through the antenna unit (AU) located in the shaded area in the layer. This can provide smooth call quality by eliminating all shadow areas in the building.

13 is a view showing another example in which the indoor optical relay system according to an embodiment of the present invention is applied.

The signal of the base station 10 is converted into a digital signal through the main donor 12, and then converted into an all-optical signal and transmitted as a digital optical signal to a sub-donor located in the center of a tunnel and a road where a shadow area exists. The sub-donor transmits the digital optical signal through photoelectric conversion, analog conversion and all-optical conversion to a remote located in a tunnel and road where a shadow area exists using a single optical fiber. The remote, which receives the analog optical signal, performs photoelectric conversion and outputs it through the antenna unit (AU) located in the shaded area. This can provide smooth call quality in long shadowed areas such as tunnels and roads by eliminating distance loss using the fiber between the sub-donor and the remote.

According to the present invention as described in detail above, by transmitting the digital optical signal between the main donor and the sub-donor and the analog optical signal in the building to implement the efficiency of the system configuration and stable relay service, the 2.5G and 3G service High-speed, large-capacity data is transmitted to repeaters in the building, eliminating shadow areas in the building.

In addition, since the transmission of the sub-donor and the remote is an optical signal, it is not affected by the loss due to the length, and thus it is possible to solve the shadow area of the long shadow area such as tunnel and road as well as the indoor repeater system.

On the other hand, the present invention is not limited only to the above-described embodiment, but can be modified and modified within the scope not departing from the gist of the present invention, the technical idea to which such modifications and variations are also applied to the claims Must see

Claims (4)

Among the sector signals applied from the base station, one sector signal is differently selected for each branch, and each sector signal is divided into FA signals and outputted, and the sector-specific FA signals of each branch to be inputted are combined into one signal to the base station. RF signal distribution / adding unit to be transmitted, and converts the analog signal for each FA in the downstream applied by the RF signal distribution / sum unit into a digital signal, and converts the digital signal for each FA in the upstream input into an analog signal. A signal processing unit installed for each branch applied to the RF signal distribution / summing unit, a digital signal for each FA in the downstream applied from the signal processing unit, and an electrical digital signal for the upstream input Digital scene installed for each branch which is divided into signals for each FA and applied to the signal processing unit An optical unit converts an electric digital signal of a corresponding sector in the downstream applied from the call unit and the digital signal unit, and converts the digital optical signal of the corresponding sector in the upstream input to the digital signal unit An optical transponder installed for each branch, and a digital optical signal for each sector in the downstream output from the optical transponder to a sub donor of a corresponding branch, and for each sector in the upstream input from the sub donor A main donor comprising a wavelength division multiplexing coupler installed for each branch for transmitting a digital optical signal to the optical transponder; And A wavelength division multiplexing coupler for receiving a digital optical signal of the main donor through one optical line and transmitting an input upstream digital optical signal to the main donor through one optical line; A digital optical transponder which photoelectrically converts and outputs a digital optical signal into an electrical digital signal, converts the electrical digital signal at the time of input upstream into a digital optical signal, and applies it to the wavelength division multiplexing coupler. The digital optical transponder A digital signal unit for separating and outputting the digital signal from the FA for each FA and applying the upstream FA digital electrical signal into the same sector signal to the digital optical transponder; A signal processing unit which converts and outputs an electrical digital signal for each FA from the digital signal unit into an analog signal, converts the electrical analog signal for each FA in the upstream input into a digital signal, and applies it to the digital signal unit. ; Combine the electrical analog signals for each FA from the signal processing unit into one and split them to a plurality of remote sides, combine the analog electrical signals for each FA in the upstream inputted by photoelectric conversion into one, and then separate the signals for each FA again. The optical combiner outputs the frequency combiner / splitter unit to be applied to the processing unit and the FA-specific analog electric signal splitted from the frequency combiner / splitter unit by all-optical conversion, and outputs the analog optical signals from the plurality of remote sides. A plurality of analog optical transponders for photoelectric conversion and transmission to the frequency combiner / splitter unit, and analog optical signals from the respective analog optical transponders to a corresponding remote, the analog optical signals from the remote To the corresponding analog optical transponder Is composed of a plurality of wavelength division multiplexed coupler, it is connected one-to-one to each branch, but each having a plurality of sub-donor associated with the plurality of remotes, A digital optical signal is transmitted between the main donor and the sub donor, and a plurality of remotes connected to each of the sub donors and their respective sub donors are connected by one optical line, and the one optical line has a downstream and a plurality of And an optical splitter for mixing and distributing analog optical signals having different wavelengths when upstream. delete delete The method of claim 1, The frequency combiner / splitter unit includes: a combiner for combining the FA-specific analog electrical signals inputted from the signal processing unit into one signal; A splitter for dividing one signal output from the combiner into a predetermined number of RF signals and applying the same to the plurality of analog optical transponders; A combiner for combining the respective analog signals input by photoelectric conversion in the plurality of analog optical transponders into a single signal; And an FA separation filter for separating one signal output from the combiner for each FA and applying the same to the signal processing unit.