WO2016148538A1

WO2016148538A1 - Apparatus and method for suppressing multi-band pimd in mobile communication

Info

Publication number: WO2016148538A1
Application number: PCT/KR2016/002764
Authority: WO
Inventors: 조형식; 장대엽; 이경수
Original assignee: (주)에이더블유에스아이
Priority date: 2015-03-18
Filing date: 2016-03-18
Publication date: 2016-09-22
Also published as: KR20160112131A

Abstract

The present invention relates to an apparatus and method for suppressing multi-band PIMD in which an antenna, a multi-band input unit and a receiving unit of a base station are connected using a directional coupler. The apparatus and method for suppressing multi-band PIMD according to the present invention reduce the PIM magnitude of a Tx signal using the directivity of the directional coupler to allow the Tx signal to be distinguishable from an Rx signal, and thus enables signals, which have been transmitted and received through multiple conventional transmission lines, to be transmitted through a single transmission line.

Description

Mobile communication multi-band PIMD suppression device and method

The present invention relates to an apparatus and method for suppressing multi-band PIMD using directivity of a directional coupler.

Recently, due to the development of mobile communication technology, individuals are carrying mobile terminals, and various operators are participating in the mobile communication business as the demand of users increases. As the number of mobile operators increases, consumers have the advantage of being able to receive a variety of services at a lower price. However, as the number of transmission lines increases, there is a problem that the appearance has an adverse effect and the installation cost increases.

In order to solve these problems, efforts have been made to unify transmission lines, and there have been attempts to unify transmission lines and receiving lines. However, due to the characteristics of the non-linear system, multi-band Tx signal synthesis results in Passive Inter-Modulation Distortion (PIMD). (See Figure 1). When a PIM signal is generated, the communication system degrades the call quality or the base station usable capacity due to the interference signal.

Korean Patent Publication No. 10-0442537 proposes a method of overcoming the PIMD problem by using a phase remover, but the above problems are still not solved.

Therefore, many investments have been made to solve these problems, and research is being conducted in various directions.

An object of the present invention is to provide a PIMD suppression apparatus and a suppression method capable of transmitting and receiving a Multi-Band Tx signal and an Rx signal through a single line.

An object of the present invention as described above comprises a directional coupler having at least three connections, wherein the directional coupler is electrically connected to a multiband input and receives a first multiband signal received from the multiband input. A first connection unit for transmitting to the directional coupler, a second connection unit electrically connected to the antenna and transmitting a second multi-band signal received through the antenna to the directional coupler, and a directivity and a coupling degree of the directional coupler ( A first multiband signal attenuated by a coupling rate) and a second multiband signal attenuated by a coupling degree of the directional coupler to a base station receiver; and a first attenuated signal connected to the third connector; An uplink (UL) filter that removes a multiband signal, and an amplified second multiband signal connected to a rear end of the UL filter. Can be achieved by providing a multi-band PIMD suppression device comprising an amplifier.

On the other hand, an object of the present invention described above, in the multi-band PIMD suppression method for connecting the antenna, the multi-band input unit and the base station receiver using a directional coupler, (a) the multiple input through the first terminal of the directional coupler A first multi-band signal of the band input unit is attenuated by the coupling rate and the directivity of the directional coupler and output through the third terminal of the directional coupler; and (b) the first multiband signal of the directional coupler; A second multi-band signal input through two terminals is attenuated by the coupling degree of the directional coupler and output through the third terminal of the directional coupler; and (c) an uplink (UL) filter connected to the third terminal. Removing the attenuated first multiband signal, (d) an amplifier connected to a rear end of the UL filter amplifying the attenuated second multiband signal, and (e) the amplifier It can be achieved by providing a multi-band PIMD suppression method comprising the step of passing the second multi-band signal amplified by the base station receiver.

According to the Multi-Band PIMD suppression apparatus according to the present invention, the PIM of the Tx signal can be reduced and distinguished from the Rx signal by using the directivity of the directional coupler. It is possible to transmit via.

1 is a block diagram of a conventional Multi-Band synthesis system.

2 is a block diagram of a multi-band PIMD suppression apparatus according to an embodiment of the present invention.

3 is a conceptual diagram for explaining an operation of the apparatus shown in FIG.

4 is a conceptual diagram showing a change in output value at each terminal of the apparatus shown in FIG. 2;

FIG. 5 is a conceptual diagram illustrating a comprehensive power level of the output values shown in FIG. 4. FIG.

6 is a conceptual diagram of a single-line MIMO providing apparatus using a multi-band PIMD suppression apparatus according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the embodiments described below are merely to describe in detail enough to be able to easily carry out the invention by those skilled in the art to which the present invention pertains, thereby limiting the protection scope of the present invention It does not mean. In describing various embodiments of the present invention, the same reference numerals will be used to refer to elements having the same technical features.

2 is a block diagram of a multi-band PIMD suppression apparatus 100 according to an embodiment of the present invention.

Referring to FIG. 2, the multi-band PIMD suppression apparatus 100 includes a directional coupler 110.

The directional coupler 110 connects the multi-band input unit 200 and the base station receiver 300 with the antenna 400. To this end, the directional coupler 110 according to the present embodiment includes at least three connections.

As shown in FIG. 2, the directional coupler 110 has four terminals. The first terminal 111 is connected to the multi-band input unit 200, the second terminal 112 is connected to the antenna 400, the third terminal 114 is connected to the base station receiving unit 300, the fourth Terminal 113 is terminated.

Herein, the multi-band input unit 200 refers to a transmitter Tx of the operators transmitting signals to the personal terminals, and the base station receiver 300 refers to a receiver of the operators receiving signals transmitted from the personal terminals. Rx). As shown, the signals of the multi-band input unit 200 may be combined by the Tx combiner, and the signals of the base station receiver 300 may be separated by the Rx filter.

In the present embodiment, the multi-band input unit 200 and the base station receiver 300 are connected to the antenna 400 through one line 500. The directional coupler 110 is disposed between the multi-band input unit 200, the base station receiving unit 300, and one line 500.

The directional coupler 110 has a directivity and a coupling rate.

Coupling rate, also called coupling factor, is used as a measure of the power ratio between the primary and secondary paths.

Directivity is a measure of how well the signal propagated in the traveling direction in the main path couples to a certain terminal in the sub-path.

As shown, a signal transmitted from the multi-band input unit 200 (Down Link signal, hereinafter referred to as 'DL signal') is input to the first connection unit of the directional coupler 110 and then the second connection unit and the third connection unit Is output via Similarly, a signal (uplink signal, hereinafter referred to as an 'UL signal') received by the antenna through the personal terminals is input to the second connection part of the directional coupler 110 and then output through the third connection part.

The first connection part includes a first terminal 111 and the second connection part includes a second terminal 112. The third connection part includes a third terminal 114, an UL filter 121, an amplifier 115, and the like.

The DL signal is output to the second terminal 112 via the main path of the directional coupler 110 and transmitted to the antenna 400 through the connection line. The DL signal is transmitted to the

user terminals

401, 402, and 403 for each communication company via the antenna 400.

In addition, the DL signal is attenuated by the coupling rate (coupling rate) and directivity (directivity) through the directional coupler 110 and output to the third terminal 114, the PIM signal of these signals to the base station receiver 300 as noise It will work. How to remove this will be described in detail with reference to FIGS.

The UL signals transmitted from the

user terminals

401, 402 and 403 are input to the second terminal 112 of the directional coupler 110 via the antenna 400 and the connection line 500.

The UL signal input to the second terminal 112 is attenuated by the coupling rate of the directional coupler 110 and output to the third terminal 114.

The UL signal output to the third terminal 114 passes through the UL filter 121, and the DL signal is removed.

The UL signal from which unnecessary signals are filtered through the UL filter 121 is amplified by the amplifier 115 and then transmitted to the base station receiving unit 300 and separated into several signal bands from the base station receiving unit 300 to each operator.

3 is a conceptual diagram for describing an operation of the apparatus illustrated in FIG. 2, FIG. 4 is a conceptual diagram illustrating a change in output value at each terminal of the apparatus illustrated in FIG. 2, and FIG. 5 is a diagram illustrating a DL output value illustrated in FIG. 4. It is a conceptual diagram which shows the comprehensive power level.

3 to 5, when the DL signal is input through the first terminal 111 of the directional coupler 110, the signal size of the DL signal is attenuated by the coupling degree and the directionality to the third terminal 114. It is delivered (S100).

Meanwhile, the UL signal is input through the second terminal 112 of the directional coupler 110 and then transferred to the third terminal 114 (S200). The UL signal passing through the directional coupler 110 is attenuated by the degree of coupling of the directional coupler 110 to have the same size as 113 shown in FIG.

Attempts are made to exclude mutual interference of transmit and receive radio waves by varying the bands of transmit and receive radio waves, but due to the characteristics of nonlinear systems, interference of transmit and receive signals is caused by PIM. That is, when the multi-band input is combined and transmitted as in the present invention, numerous PIMs are generated in the process, and PIMs of bands used for reception radio waves exist. Hereinafter, for convenience of description, a band required by the receiver Rx is referred to as a base station receiver required band b, and a band required by the transmitter Tx is referred to as a base station transmitter required band a (see FIG. 4). .

Both the UL signal and the DL signal are transmitted to the third terminal 114, and there is a PIM generated in the base station receiver required band (b) in the DL signal. In general, the PIM is smaller than the main input signal. In the present invention, this PIM value is minimized by using the directional coupler 110 to lower the negligible level compared to the UL signal.

That is, referring to Figure 5, it can be seen that the PIM signal value in the base station receiver required band (b) is reduced by the degree of coupling + direction compared to the size of the original PIM signal existing in the main path.

The base station transmitter required band (a) signal output through the third terminal 114 is filtered through the UL filter 121, and passes only the signal of the band (b) necessary in the UL signal (S300).

The UL signal from which the unnecessary band a signal is removed is amplified through the amplifier 115 (S400).

The PIM value of the DL signal output through the third terminal 114 of the directional coupler 110 may be negligibly small compared to the UL signal of step S400 to select the UL signal.

The UL signal is transmitted to the base station receiver 300 (S500) and separated from the base station receiver 300 by the Rx Filter and transmitted to each operator.

6 is a conceptual diagram of a single-line MIMO providing apparatus 100 ′ using the multi-band PIMD suppression apparatus 100 according to an embodiment of the present invention.

Referring to FIG. 6, the single-line MIMO providing apparatus 100 ′ according to another embodiment of the present invention may include the multi-band PIMD suppression apparatus 100 and the single-line MIMO apparatus 150 described above.

The single line MIMO device 150 includes a main unit 151, and a first terminal 152 and a second terminal 153 connected to the main unit 151. The main unit is also connected to the base station 400 via a single line 500.

According to this structure, it is possible to effectively relay the MIMO signal applied in the wireless communication system of the multiple access method without distortion, and further extend or transmit the MIMO signal from the base station 400 or the repeater to a plurality of antennas by a certain distance. When a plurality of transmission cables corresponding to the number of MIMO antennas can be shared by one transmission cable, it is possible to significantly reduce the facility cost of the relay device.

The main unit 151 makes the transmission channel matrix between the service antennas and the terminal 2x2, and transmits the signal of the MIMO base station 400 or the repeater to the service antenna using one cable. In order to make two or more paths in one cable, two or more transceivers are provided in the repeater, and the frequency down part and the frequency up part of at least one of the two or more transceivers are separated from each other. By implementing on the donor and the service antenna side connected to the base station 400 or the repeater by wire or wirelessly, it is possible to have two or more independent different paths in one cable.

Multi-Band PIMD suppression apparatus according to at least one embodiment of the present invention configured as described above can be distinguished from the Rx signal by reducing the PIM size of the Tx signal using the directivity of the directional coupler. Through this, it is possible to transmit the signal transmitted and received through the conventional multiple lines through a single line.

Although the embodiments of the present invention have been described above, it will be understood by those skilled in the art that various modifications may be made without departing from the scope of the claims of the present invention.

According to the Multi-Band PIMD suppression apparatus according to the present invention, the PIM of the Tx signal can be reduced and distinguished from the Rx signal by using the directivity of the directional coupler. Can be sent through.

Claims

A directional coupler having at least three connections,

The directional coupler,

A first connection unit electrically connected to the multiband input unit to transfer a first multiband signal received from the multiband input unit to the directional coupler;

A second connection part electrically connected to an antenna and transferring a second multiband signal received through the antenna to the directional coupler;

A third connection unit configured to transmit a first multiband signal attenuated by the degree of directivity and coupling rate of the directional coupler and a second multiband signal attenuated by the degree of coupling of the directional coupler to a base station receiver;

An uplink (UL) filter connected to the third connector to remove the attenuated first multiband signal; And

And an amplifier connected to a rear end of the UL filter to amplify the attenuated second multi-band signal.
In the multi-band PIMD suppression method for connecting the antenna, the multi-band input unit and the base station receiver using a directional coupler,

(a) a first multi-band signal of the multi-band input unit inputted through the first terminal of the directional coupler is attenuated by the coupling rate and the directionality of the directional coupler to form a third terminal of the directional coupler; Output through;

(b) a second multi-band signal input through the second terminal of the directional coupler is attenuated by the coupling degree of the directional coupler and outputted through the third terminal of the directional coupler;

(c) an uplink (UL) filter connected to the third terminal to remove the attenuated first multiband signal;

(d) amplifying the attenuated second multiband signal by an amplifier connected to a rear end of the UL filter; And

(e) transmitting the second multi-band signal amplified by the amplifier to a base station receiver.
In the single-line multiple input and output (MIMO) providing apparatus including a multi-band PIMD suppression device,

Directional couplers; And

Including the main unit,

The directional coupler may include: a first connection unit electrically connected to the multiband input unit to transfer the first multiband signal received from the multiband input unit to the directional coupler; A second connection portion for transmitting a multi-band signal to the directional coupler, a first multi-band signal attenuated by the direction and coupling rate of the directional coupler, and attenuated by the coupling degree of the directional coupler A third connector for transmitting the second multiband signal to a base station receiver, an UL (Up Link) filter connected to the third connector to remove the attenuated first multiband signal, and a rear end of the UL filter; An amplifier for amplifying the attenuated second multiband signal,

And the main unit is configured to create a transmission channel matrix between the antenna and the plurality of terminals and to transmit a signal of a base station or repeater of a MIMO scheme to the antenna using one cable.
In a single line multiple input / output (MIMO) transmission method based on multi-band PIMD suppression,

(a) the first multi-band signal of the multi-band input unit inputted through the first terminal of the directional coupler is attenuated by the coupling rate and the directivity of the directional coupler to replace the third terminal of the directional coupler; Output through;

(b) a second multi-band signal input through the second terminal of the directional coupler is attenuated by the coupling degree of the directional coupler and outputted through the third terminal of the directional coupler;

(c) an uplink (UL) filter connected to the third terminal to remove the attenuated first multi-band signal;

(d) amplifying the attenuated second multi-band signal by an amplifier connected to a rear end of the UL filter; And

(e) passing the second multi-band signal amplified by the amplifier to a base station receiver,

The first and second multi-band signals are transmitted and received based on MIMO between an antenna formed by a main unit and a plurality of terminals, and the first and second multi-band signals are transmitted to the antenna via one cable. And receiving a single line MIMO transmission method.