KR20020040924A - A device of extension bts antenna for wll - Google Patents

Abstract

PURPOSE: An apparatus for establishing an antenna of a BTS(Base Transceiver Station) in a WLL(Wireless Local Loop) network is provided to use only antennas corresponding to the number of FA(Frequency Assignment) in the case of using 2 FAs or more and simultaneously establish an antenna with a new FA without stopping a transmission and receipt service by the FA during operation. CONSTITUTION: Transmission and receipt antennas(100,102,104) output transmission signals of specific FAs among a plurality of FAs assigned in a WLL and used as a communication channel and receive receipt signals with all FAs of a BTS. Duplexers(110,112,114) connect to the transmission and receipt antennas(100,102,104), divide the transmission signals and the receipt signals, and output the transmission signals and the receipt signals to corresponding paths. HPAs(High Power Amplifiers)(140,142,144) amplify transmission signals provided from corresponding RF units of the BTS. Channel filters(130,132,134) do not pass signals except for the assigned FAs of the RF signals outputted from the HPAs(140,142,144), and output passed corresponding RF signals to the corresponding duplexers(110,112,114). LNAs(Low Noise Amplifiers)(120,122,124) amplifies the receipt signals provided by the duplexers(110,112,114) and output the amplified receipt signals to two paths at a same level. A plurality of filters(150-160) receive the receipt signals outputted by the LNAs(120,122,124) and pass only receipt signals with the assigned FAs.

Description

Base station antenna expansion device of wireless subscriber network {A DEVICE OF EXTENSION BTS ANTENNA FOR WLL}

The present invention relates to an apparatus for minimizing the use of a base station (BTS) antenna when expanding a frequency band (FA) in a wideband CDMA (W-CDMA) wireless local loop (WLL). In the case of adding a frequency band without a guard band, the present invention relates to a device that allows an existing antenna to be shared while expanding the existing service without interrupting an existing service.

A wireless subscriber network (WLL) uses a W-CDMA mobile communication system and enables wireless voice communication and high-speed data communication in a terminal. The W-CDMA mobile communication system transmits and receives between a base station and a mobile station. Since the frequency of the channel is operated differently, the transmit antenna and the receive antenna are used respectively.

When data communication is performed in the wireless subscriber network, a fading phenomenon occurs due to various wireless transmission paths in a base station (BTS) that receives a signal output from a terminal.

The fading phenomenon causes an error in the digital data signal wirelessly received from the base station. In order to minimize the fading phenomenon, two reception antennas are used in a space diversity scheme.

Hereinafter, an antenna extension apparatus for a wireless subscriber network according to the prior art will be described with reference to the accompanying drawings.

1 is a wireless subscriber network antenna expansion device according to an example of the prior art, Figure 2 is a wireless subscriber network antenna expansion apparatus according to another example of the prior art.

Referring to FIG. 1, in the antenna extension apparatus of a wireless subscriber station base station (BTS) according to an example of the prior art, an antenna facility method in the case of using one frequency band is a transmission (TX). A main antenna or antenna 1 (10) for use as a first receiving antenna of space diversity (SD),

A diversity antenna or antenna 2 (12) used as a second reception antenna of a wireless subscriber network base station space diversity (SD),

The base station is connected to the antenna 1 (10), applies a transmission signal TX1 applied from the wireless subscriber network base station (BTS) to the antenna 1 (10), and separates the signal received from the antenna 1 (10). And a duplexer 20 applied to the BTS.

In case of using one frequency band (1 FA) as described above, antenna 1 (10) is used as a transmission antenna, and antenna 1 (10) is used as a spatial diversity first reception antenna, and space is used. Antenna 2 (12) is used as the diversity second reception antenna.

Accordingly, since the antenna 1 10 is used as a first reception antenna for transmission and spatial diversity, it is necessary to separate the transmission (TX) signal and the reception (RX) signal and output the signals through different paths.

Since the mobile communication system uses the transmission (TX) frequency and the reception (RX) frequency at regular intervals so that transmission and reception by communication are performed at the same time, a filter function of the duplexer 20 is used. The transmission (TX) signal input from the base station is applied to the antenna 1 (10) and transmitted, the signal received from the antenna (1 10) (RX) is separated from the transmission signal by the duplexer 20, 1 is a spatial diversity reception signal, and is output to a corresponding reception section of a base station (BTS).

The signal received from the antenna 2 12 is a second received signal of spatial diversity and is output to a corresponding receiver of a base station (BTS), which is not shown in detail in the drawing.

Therefore, two antennas may be used when one frequency band FA is used.

In addition, according to the prior art with reference to Figure 1, when using three frequency bands (FA), the configuration of the antenna 1 (10) is the same as described above,

An antenna 2 (12) for the transmission signal TX2 and the reception signal RX2 of the second frequency band FA2 and the second reception signal RX1 'of the first FA,

A second duplexer 22 connected to the antenna 2 (12) for separating the transmission signal TX2 and the reception signal RX1 ', RX2 and outputting the respective paths;

A first low noise amplifier (LNA) 40 for receiving, amplifying and outputting weak reception signals RX1 'and RX2 connected to the second duplexer 22 and outputting the amplified signals;

A first filter 30 which receives the received signals RX1 'and RX2 that are amplified and output from the first low noise amplifier 40, filters and outputs only the RX1' signal, and

A second filter 32 which receives the received signals RX1 'and RX2 that are amplified and output from the first low noise amplifier 40, filters and outputs only the RX2 signal, and

An antenna 3 (14) for transmitting and receiving the transmission signal TX3 and the reception signal RX3 of the third frequency band FA3 and the second reception signal RX2 'of the second FA;

A third duplexer 24 connected to the antenna 3 (14) for separating the transmission signal TX3 and the reception signal RX2 ', RX3 and outputting the respective paths;

A second low noise amplifier 42 which receives the received signals RX2 'and RX3 output from the third duplexer 24 and low noise amplifies it;

A third filter 34 connected to the second low noise amplifier 42 to filter and pass only the RX2 'received signal, and a fourth filter 36 to filter and pass only the RX3 received signal;

An antenna 4 (16) for receiving the second received signal (RX3 ') of the third frequency band FA3.

In the prior art as described above, when the frequency band FA increases, an antenna is required to add one to the number of increasing frequency bands.

As an example, three antennas are required when using two frequency bands (FA), four antennas are required when using three FAs, and so on. n) + 1 = n + 1 ",

Therefore, one more number of antennas is required than the frequency band FA used in the base station.

With reference to the accompanying Figure 2, by another example of the prior art, a device for further minimizing the use of the antenna will be described.

FIG. 2 shows the use of two frequency bands FA, the transmission signal TX1 of the first frequency band FA1, the first reception signal RX1, and the second frequency band FA2. 2 antenna 1 (10) for transmitting and receiving the received signal (RX2 '),

A first coupler 50 connected to the antenna 1 10 to monitor signals transmitted and received;

A first duplexer 20 connected to the first coupler 50 to separate the transmission signals TX1 and the reception signals RX1 and RX2 'and output them to respective paths;

A first low noise amplifier (LNA) 40 connected to the first duplexer 20 to amplify and output the weak signals RX1 and RX2 'received with low noise;

A second filter for filtering and passing only the first filter 30 and the RX2 'signal that pass through by filtering only the RX1 signal among the received signals RX1 and RX2' that are connected to the low noise amplifier 40. A filter 32,

An antenna 2 (12) for transmitting and receiving the transmission signal TX2 of the second frequency band FA2, the first reception signal RX2, and the second reception signal RX1 'of the first frequency band FA1;

A second coupler 52 connected to the antenna 2 12 for monitoring signals transmitted and received;

A second duplexer 22 connected to the second coupler 52 for separating the transmission signal TX2 and the reception signal RX2, RX1 'and outputting the respective paths;

A second low noise amplifier (LNA) 42 connected to the second duplexer 22 for amplifying and outputting the weak signals RX2 and RX1 'received at low noise;

A third filter 34 for filtering and passing only the RX2 signal among the received signals RX2 and RX1 'connected to the low noise amplifier 42 and a fourth filter for filtering and passing only the RX1' signal. It consists of a filter 36.

In the antenna extension apparatus according to another example of the prior art, the antenna 1 (10) transmits and receives a transmission signal of the first FA, a first reception signal, and a second reception signal of the second FA, and in the antenna 2 (12) Transmits and receives a first FA and a second received signal of the second FA, and the first coupler 50 and the second coupler 52 are the antenna 1 (10) and the antenna 2 (12). It is used to monitor the signal transmitted / received through).

The first duplexer 20 and the second duplexer 22 respectively connected to the first coupler 50 and the second coupler 52 separate the transmitted and received signals into respective paths. The first LNA 40 and the second LNA 42, which are connected to the first duplexer 20 and the second duplexer 22, respectively, amplify and output the received signal to an appropriate level.

The first to fourth filters are respectively connected to the corresponding LNAs 40 and 42, and filter only the received signals of RX1, RX2 ', RX2, and RX1', respectively.

In the prior art as described above, two frequency bands (FA) are used, and two antennas may be used even in a state where spatial diversity technology is applied.

However, in the prior art according to another example as described above, since antennas can be added in units of two frequency bands (FA), there is a problem that four antennas are required when three frequency bands are required.

In addition, in the prior art, when the frequency band FA is added, the first frequency band should be installed first, and when the frequency band FA is added or added to add or expand the antenna, the adjacent frequency band FA ), There was a problem that the transmission and reception services using the () should be suspended.

The technique of the present invention. In case of using two or more frequency bands, the antenna of the wireless subscriber network that can use only the antenna corresponding to the frequency band number and can expand the antenna of the new frequency band without interrupting the transmission / reception service by the operating frequency band. It is an object to provide an expansion device.

In order to achieve the above object, the present invention provides a wireless subscriber network base station using a plurality of frequency bands as a communication channel; A plurality of transmit and receive antennas for outputting a transmission signal of a specific band among a plurality of frequency bands allocated to the wireless subscriber network and receiving a reception signal of all corresponding bands; A plurality of duplexers connected to the transmit / receive antennas and separating and transmitting the transmitted signals and the received signals to respective paths; A plurality of high output amplifiers for amplifying and outputting a transmission signal applied from a base station to a high output; A plurality of channel filters which prevent a signal other than a frequency band of a signal output from the high output amplifier from passing through and output the corresponding signal to a corresponding duplexer; A plurality of low noise amplifiers for amplifying and outputting the received signal applied by the duplexer with low noise; It is characterized by consisting of a plurality of filters that receive the received signal output by the low noise amplifier and passes only the received signal of the frequency band.

1 is a wireless subscriber network antenna expansion apparatus according to an example of the prior art,

Figure 2 is a wireless subscriber network antenna expansion apparatus according to another example of the prior art,

3 is a diagram illustrating a configuration of a base station frequency band device using one frequency band according to the present invention;

4 is a block diagram of a base station frequency band device using multiple frequency bands according to the present invention.

** Explanation of symbols on the main parts of the drawing **

10, 12, 14, 16, 100, 102, 104: antenna 20, 22, 24, 110, 112, 114: duplexer

30,32,34,36,150,152,154,156,158,160

40, 42, 120, 122, 124: low noise amplifier 130, 132, 134: channel filter

140,142,144: High power amplifier 170,172,174: Frequency band device

Hereinafter, according to the present invention, a base station antenna expansion apparatus of a wireless subscriber network will be described with reference to the accompanying drawings.

3 is a schematic diagram of a base station frequency band device using one frequency band according to the present invention, and FIG. 4 is a base station frequency using a plurality of frequency bands according to the present invention. Band device configuration diagram.

3 is a configuration diagram of a base station frequency band device 170 according to the present invention configured to receive one frequency band FA, and transmits a TX signal of a specific frequency band FA. A transmission and reception antenna 100 for receiving a reception (RX) signal of the allocated frequency band FA, and

A duplexer (110) connected to the transmission / reception antenna (100) and separating the transmission (TX) signal and the reception (RX) signal and outputting the respective paths;

A high power amplifier (HPA) 140 for amplifying and transmitting a TX signal applied from a corresponding high frequency (RF) unit of a base station to a high power (HPA);

A channel which is connected to the high output amplifier 140 and prevents a signal other than the allocated frequency band FA of the output high frequency RF signal from passing through and outputs the passed high frequency signal to the duplexer 110. Filter 130,

Amplifies the received RX signal output and applied by the duplexer 110 with low noise, and outputs two paths at the same output level and outputs one path at the same time. LNA 120 to terminate, and

A filter 150 for receiving the received signal output by the low noise amplifier 120 and passing only the first received signal RX1 of the allocated frequency band FA;

An antenna 2 (102) for receiving the second received signal RX1 'according to the allocated frequency band FA by space diversity (SD);

A second low noise amplifier 122 that amplifies the level of the signal received by the antenna 2 102 to a predetermined magnitude;

The second filter 152 receives the second received signal RX1 ′ output by the second low noise amplifier 122 and passes only the second received signal RX1 ′.

Referring to FIG. 4, an antenna by the multiple frequency band devices 170, 172 and 174 of the base station, which is allocated to the first to nth multiple frequency bands FA and used as a communication channel of the wireless subscriber network (WLL). The expansion device outputs a transmission (TX) signal of a specific frequency band (FA), among a plurality of frequency bands (FA) allocated to a wireless local loop (WLL) and used as a communication channel, Transmit and receive antennas 100, 102 and 104 for receiving all frequency band (Rx) received (RX) signals,

A duplexer (110, 112, 114) connected to the transmit / receive antennas (100, 102, 104) and separating the transmit (TX) signal and the receive (RX) signal and output the respective paths;

High power amplifiers (HPAs) 140, 142, and 144 for amplifying and transmitting a TX signal applied from a corresponding high frequency (RF) unit of a base station to a high power;

It is connected to the high power amplifiers 140, 142, and 144, and prevents signals other than the allocated frequency band FA of the output high frequency (RF) signal from passing, and the corresponding high frequency signals are passed to the corresponding duplexers 110, 112, and 114, respectively. Output channel filters (130, 132, 134),

Low noise amplifiers (LNAs) 120, 122, and 124 that amplify received (RX) signals applied by the duplexers 110, 112, and 114 with low noise, and output two paths at the same output level. ,

A plurality of filters 150, 152, 154, 156, 158, and 160 which receive the received signals output by the low noise amplifiers 120, 122, and 124 and pass only the received (RX) signals of the allocated frequency band FA.

In the above configuration, each of the low noise amplifiers 120, 122, and 124 is input to one of the two paths that are output to the assigned filter 150, 154, and 158 of the corresponding frequency band device 170, 172, 174, and the other path ( Path is input to the assigned filters 156, 160 of the adjacent frequency band devices 172, 174, and the remaining paths of the adjacent frequency band devices 174 in the last order are filtered by the frequency band devices 170 in the first order. This is the configuration input to 152.

Hereinafter, a wireless subscriber network base station antenna expansion apparatus according to the present invention having the above configuration will be described in detail with reference to FIGS. 3 to 4.

3 and 4 attached to the accompanying drawings, the description is easy to explain, so that some of the member numbers are used repeatedly.

The wireless subscriber network (WLL) uses a W-CDMA mobile communication system, and is a fixed device to which a terminal cannot move. The wireless subscriber network (WLL) enables digital data communication such as FAX and Internet access using the terminal. In the digital data communication, an error occurs in the received data when the path of the received signal is overlapped.

In more detail, when a data signal having the same content transmitted from the terminal is received at the base station (BTS), the path received by the base station is a direct path, and the first to n th reflection paths are generated. In the case of Urban, the paths vary greatly,

Therefore, the signal received by the base station causes a slight phase difference for each signal by the path, depending on the length of each path.

The phenomenon in which the phase difference overlaps as described above is called a fading phenomenon, and in digital communication, an extremely fatal result such as an error occurs in an editor.

The technique for overcoming the fading phenomenon is a diversity technique, and a technique for receiving a signal received through each path through each antenna and selecting and receiving only a signal having the best signal characteristics. .

Among the diversity technologies described above, Space Diversity (SD) technology separates two or more receiving antennas at regular intervals and receives signals of different paths from each receiving antenna. The problem is that you need a lot of numbers.

In general, a mobile communication system or a PCS system for voice communication is adjacent to a plurality of communication channels used by a base station (BTS) with a certain protection channel interposed therebetween to prevent interference, but in a wireless subscriber network (WLL), allocated frequency resources The frequency band FA, which is a plurality of communication channels, is adjacent to each other because this is not sufficient.

As described above, a general PCS system for voice communication may use a combiner to reduce the number of transmitting and receiving antennas. However, since the FAs are adjacent to each other in the wireless subscriber network (WLL), the combiner cannot be used. There is a different problem of separately using an antenna for transmitting and receiving for each FA.

The present invention intends to use the minimum number of antennas while using spatial diversity (SD) technology in the wireless subscriber network (WLL) as described above.

3 is a diagram illustrating a configuration of a base station frequency band device 170 when a frequency band FA is allocated to a communication channel frequency in a wireless subscriber network (WLL). 1 (100) is a signal transmitted by the allocated frequency band FA and a signal transmitted from a terminal that receives the transmission signal TX, and is a first signal received through a first path due to fading. The receiving signal RX1 is received, and the antenna 2 102 receives the second receiving signal RX1 'received through the second path due to the fading.

The signal transmitted through the antenna 1 (100) is amplified by the high power amplifier (HPA) 140, the signal applied from the high frequency portion of the base station, by removing the unnecessary noise signal by the channel filter 130, the duplexer Is applied to 110.

The duplexer 110 outputs the transmitted signal to the antenna 1 (100), and separates the path so that the received signal is output to the low noise amplifier (LNA) (120).

The first received signal RX1 received through the antenna 1 100 is applied to the low noise amplifier 120 by the duplexer 110, amplified to a predetermined level, and then, two signals of the same level are converted into two signals. At the same time outputting through the two paths, one path is terminated (Termination), the signal output to the other path A is applied to the first filter 150, the signal other than the first received signal (RX1) After removal, output to the receiver of the base station.

In addition, the second received signal RX1 ′ received by the antenna 2 102 is amplified to a certain level by the second low noise amplifier 122 and applied to the second filter 152 through the path B, thereby providing the second signal. 2 Remove the noise signal except the received signal RX1 'and output it to the corresponding receiver of the base station.

Therefore, when only one frequency band FA is used, at least two antennas may be used to remove fading due to spatial diversity.

Referring to FIG. 4, another example is a configuration diagram of a transmission / reception antenna extension apparatus of a base station using n frequency bands FA assigned to a communication channel.

Parts having the same member number and the same operation and effect as already described in the description of FIG. 3 will be described with the same member number, a part having a new function, or a part consisting of a new member number.

Each of the frequency band devices 170, 172, and 174 is configured with n frequency band devices when the base station is allocated n frequency bands FA, and each frequency band device has a similar configuration.

The antennas 100, 102, 104, duplexers 110, 112, 114, high power amplifiers 140, 142, 144, and channel filters 130, 132, 134 function by the functions described above.

The low noise amplifiers 120, 122, and 124 receive the received signals RX1 to RXn of all frequency bands FA used in the wireless subscriber network WLL from the duplexers 110, 112, and 114, respectively, and amplify them to a predetermined level. The output is divided into two paths, each of which is the same size.

As a transmission frequency of the base station (BTS), which is configured first, the low noise amplifier of the first frequency band device 170 using the first frequency band FA1 as the transmission signal TX1 among a plurality of FAs assigned to the base station ( 120 outputs a signal of one end output to the first filter 150, and the output signal of the other end constitutes a second frequency band device 172 using the second frequency band FA2 as a transmission signal. Is input to the fourth filter.

Accordingly, the second frequency band device 172 will be described in detail. Antenna 2 102 transmits the transmission signal TX2 by the second frequency band FA2 and the first reception signal RX2 of the FA2. ) Is used, and antenna 1 (10) constituting the first frequency band device 170 is used as an antenna for receiving the second reception signal (RX2 ').

In more detail, the first received signal RX2 of FA2 is output to the third filter 154 through the second low noise amplifier 122, and the second received signal RX2 ′ of FA2 is the first low noise amplifier ( It is output to the fourth filter 156 through the 120.

The second frequency band device 172 using the FA2 uses the antenna 1 110 and the antenna 2 102 having a spatially constant interval by the spatial diversity SD.

The signal output from the remaining paths of the second low noise amplifier 122 constituting the second frequency band device 172 is repeatedly applied to the third frequency band device using FA3 to use the nth FAn. Continue to frequency band device 174.

Accordingly, the second frequency band device 172 to the n-th frequency band device 174 respectively receive the first and second received signals RX and RX 'corresponding to each other by spatial diversity SD. The first frequency band device 170 receives a signal output from the remaining output paths of the nth low noise amplifier 124 constituting the nth frequency band device 174 from the second filter 152 and receives the second received signal of FA1. It is used as (RX1 ').

The remaining paths output from the low noise amplifiers 120, 122, and 124 may be sequentially input to adjacent frequency band devices, or may be input to any frequency band device.

Since the duplexers (110, 112, 114) and low noise amplifiers (120, 122, 124) transmits the reception frequencies of all FAs allocated and used by the corresponding base station (BTS) of the wireless subscriber network (WLL) to each path, the same internal configuration and function Have.

Accordingly, the present invention having the above-described configuration is particularly useful in wireless subscriber network (WLL) base stations that use spatial diversity (SD) technology to overcome fading. In particular, each FA prevents interference between channels. Applied when adjacent to each other without allocation of a guard channel, antennas can be minimized when two or more FAs are used.

The present invention as described above, when using a plurality of frequency bands (FA) in the wireless subscriber network, while applying the spatial diversity technique, the antenna of the assigned frequency band * 2 of the allocated frequency band + 1 of the antenna It is effective to reduce the number.

In addition, there is an effect that can reduce the area allocated for the antenna of the base station, and can expand the frequency band during operation.

Claims (5)

In the wireless subscriber network base station using a plurality of frequency bands as a communication channel, A plurality of transmit and receive antennas for outputting a transmission signal of a specific frequency band among a plurality of frequency bands allocated to the wireless subscriber network and receiving all band reception signals of the base station; A plurality of duplexers connected to the transmission / reception antennas and separating and transmitting the transmission signal and the reception signal to respective paths; A plurality of high output amplifiers for amplifying and outputting a high frequency output signal from the base station high frequency unit; A plurality of channel filters which prevent a signal other than the allocated frequency band of the high frequency signal output from the high power amplifier from passing through and output the corresponding signal to the duplexer; A plurality of low noise amplifiers for amplifying and outputting a received signal applied by the duplexer with low noise; And a plurality of filters for receiving the received signal output by the low noise amplifier and passing only the received signal of the allocated frequency band. According to claim 1, And an antenna, a duplexer, a channel filter, a high power amplifier, and a low noise amplifier, one by one, and the filter includes a plurality of filter units to configure respective frequency band devices. According to claim 1, And the low noise amplifier amplifies the received signal and outputs the received signal at the same level through two paths, respectively. The method of claim 3, wherein One of the two paths output from the low noise amplifier is input to the corresponding filter constituting the frequency band device, the other path is input to the corresponding filter constituting the adjacent frequency band device of the wireless subscriber network Base station antenna expansion device. The method of claim 4, wherein If the frequency band device constituting the low noise amplifier is in the last order of the frequency band devices constituting the base station, the remaining path is input to the corresponding filter of the frequency band device configured in the first order at the base station. Expansion device of base station antenna in subscriber network.