KR20190000994A - Wireless Communication Apparatus for MIMO Service - Google Patents

Abstract

According to an embodiment of the present invention, a wireless communication apparatus for multiple-input multiple-output (MIMO) services in an analog optical frequency division duplexing (FDD) MIMO system is for preventing inter-signal interferences even when supplying single-input single-output (SISO) radio frequency (RF) signals and MIMO RF signals at the same frequency instead of converting the SISO RF and MIMO RF signals to have different frequencies. The wireless communication apparatus includes: a master unit (MU) which converts forward SISO and MIMO signals serviced and received from a base station at the same frequency to first and second optical signals in the forward direction at different optical wavelengths to transmit the converted optical signals to a remote unit (RU) through a single optical path; and the RU which restores the first and second forward optical signals transmitted through the single optical path from the MU to individual forward SISO and MIMO signals to transmit the restored SISO and MIMO signals to an antenna.

Description

Technical Field [0001] The present invention relates to a wireless communication apparatus for a MIMO service,

The present invention relates to a wireless communication apparatus for a MIMO service, and more particularly to a wireless communication apparatus for use in a SISO RF signal and a MIMO RF signal at the same frequency And more particularly, to a wireless communication apparatus for MIMO service in an analog optical FDD MIMO system for preventing interference between signals even when supplied to one optical line.

In general, wireless communication systems are widely deployed to provide various types of communication content such as voice, data, and so on. These systems may be multiple access systems capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power). Such multiple access systems may include, for example, a Code Division Multiple Access (CDMA) system, a Time Division Multiple Access (TDMA) system, a Frequency Division Multiple Access (FDMA) system, a 3GPP Long Term to LTE system, (OFDMA) system, and the like.

Generally, a wireless multiple access communication system can simultaneously support communication for a plurality of wireless terminals. Each terminal communicates with one or more base stations via transmissions on the forward link and the reverse link. The forward link (or downlink or downlink) refers to the communication link from the base stations to the terminals, and the reverse link (also referred to as the uplink or uplink) refers to the communication link from the terminals to the base stations do. Such a communication link may be established through a single input single output (SISO), a multiple input single output (MISO), or a multiple input multiple output (MIMO) .

Meanwhile, when two signals are supplied to one optical line for the FDD MIMO service of the wireless communication device, the SISO signal and the MIMO signal are transmitted using different frequencies, as in the conventional wireless communication / The problem of interference with each other must be solved. In order to convert one signal frequency to another, many circuits such as a PLL and a mixer must be added. In order to compensate for RF signal level loss, circuits such as AMP and filter for solving the local leakage are required. There is a problem in that the equipment size increases and the equipment price increases. Also, when the service frequency band is wide and large, there is a problem of frequency conversion because it is difficult to secure a usable frequency.

2, there is a method of using two optical lines to use SISO signals and MIMO signals at the same frequency. However, since two optical lines must be used, And there is a problem that the facility cost is raised.

Published Japanese Patent Application No. 10-2015-0059979 (Jun.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide an SISO RF signal and a MIMO RF signal, The present invention provides a wireless communication apparatus for a MIMO service in an analog optical FDD MIMO system.

According to an aspect of the present invention, there is provided a wireless communication apparatus for a MIMO service, comprising: a downlink SISO signal and a MIMO signal received from a base station, A master unit (MU) for converting the first and second optical signals into a first optical signal and a second optical signal, and transmitting the first optical signal and the second optical signal to a remote unit (RU) through a single optical line; And a remote unit (RU) for transferring the first optical signal and the second optical signal in the forward direction transferred from the master unit through the single optical line to the forward SISO signal and the MIMO signal, respectively, . ≪ / RTI >

The remote unit converts a reverse SISO signal and a MIMO signal, which are received from the antenna side and are serviced at the same frequency, into a first optical signal and a second optical signal having opposite optical wavelengths, As shown in FIG.

The master unit can restore the first optical signal and the second optical signal in the reverse direction, which are transmitted from the remote unit through the single optical line, to the reverse SISO signal and the MIMO signal, respectively, and transmit the restored SISO signal and MIMO signal to the base station.

The master unit includes a master RF unit (MRU) including an SISO signal processing unit and a MIMO signal processing unit for adjusting and outputting the strengths of forward SISO signals and MIMO signals transmitted from the base station, respectively. And an SISO signal converter for converting the forward SISO signal and the MIMO signal output from the SISO signal processor and the MIMO signal processor into a first optical signal and a second optical signal having different optical wavelengths, And an edge optical filter module for filtering the first optical signal and the second optical signal in the forward direction based on the set optical wavelength and supplying the filtered optical signal to the single optical line.

The remote unit includes an edge filter unit for separating the first optical signal and the second optical signal in the forward direction received through the single optical line from each other based on the set optical wavelength, An analog optical module unit including an SISO signal conversion unit and a MIMO signal conversion unit for converting a second optical signal into a forward MIMO signal and a SISO signal, respectively; And a remote RF unit (RRU) including an SISO signal processing unit and a MIMO signal processing unit for adjusting the strength of the converted forward SISO signal and the MIMO signal to output to the antenna side, respectively.

The SISO signal converting unit and the MIMO signal converting unit of the master unit may include first and second light emitting devices having different wavelengths of light, respectively. To correspond to the SISO signal converting unit and the MIMO signal converting unit, And may include first and second light receiving elements having different light wavelengths, respectively.

The remote unit includes a remote RF unit (RRU) including an SISO signal processing unit and a MIMO signal processing unit for adjusting and outputting the strength of the reverse SISO signal and the MIMO signal transmitted from the antenna side, respectively. And an SISO signal converter for converting the reverse SISO signal and the MIMO signal respectively output from the SISO signal processor and the MIMO signal processor into a first optical signal and a second optical signal having opposite optical wavelengths, And an edge filter unit for filtering the first optical signal and the second optical signal in the reverse direction on the basis of the set optical wavelength and supplying the filtered optical signal to the single optical line.

The master unit includes an edge filter unit for separating the first optical signal and the second optical signal in the reverse direction received through the single optical line from each other based on the set optical wavelength, An analog optical module unit including an SISO signal conversion unit and a MIMO signal conversion unit for converting the second optical signals into reverse MIMO signals and SISO signals, respectively; And a master RF unit (MRU) including an SISO signal processing unit and a MIMO signal processing unit for adjusting the strength of the converted reverse SISO signal and the MIMO signal to output to the base station, respectively.

The SISO signal converting unit and the MIMO signal converting unit of the remote unit may include first and second laser diodes having different wavelengths of light, respectively. To correspond to the SISO signal converting unit and the MIMO signal converting unit, And may include first and second photodiodes having different light wavelengths, respectively.

As described above, according to the present invention, even when the SISO RF signal and the MIMO RF signal are used at the same frequency without being converted into different frequencies, they are not interfered with each other even if they are supplied to one optical line, Since multiple signals of the same frequency can be provided to the line, a MIMO service can be implemented.

In other words, since there is no need for a frequency conversion circuit for converting one signal frequency into another band as compared with the existing technology of FIG. 1, the cost of the product can be reduced and the size of the equipment can be made compact. It is possible to solve the problem of the problem.

In addition, compared to the conventional technique of FIG. 2, since only one optical line is used without frequency conversion, the difficulty of the line installation is solved and the facility cost is reduced.

In addition, it is possible to design the SISO and the MIMO to have the same structure, which facilitates the design of the equipment.

FIG. 1 is a configuration diagram of a wireless communication / relay apparatus for a MIMO service according to a conventional example,
2 is a configuration diagram of a wireless communication / relay apparatus for a MIMO service according to another example of the related art;
3 is a configuration diagram of a wireless communication apparatus for a MIMO service according to an embodiment of the present invention.
Fig. 4 is a detailed configuration diagram of Fig. 3. Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, like reference numerals are used to denote like elements in the drawings, even if they are shown in different drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

FIG. 3 is a configuration diagram of a wireless communication apparatus for a MIMO service according to an embodiment of the present invention, and FIG. 4 is a detailed configuration diagram of FIG.

3, a wireless communication apparatus for a MIMO service according to an embodiment of the present invention includes a master unit (MU) 1, a remote unit (RU) 2, And a single optical line 3 connecting the two optical fibers.

The master unit 1 transmits a forward SISO signal (or a main signal) and a MIMO signal, which are received from the base station side in the forward link and are serviced at the same frequency, to a forward first optical signal having a different optical wavelength, The second optical signal can be converted into a second optical signal and transmitted to the remote unit 2 through the single optical line 3 and transmitted from the remote unit 2 through the single optical line 3 in the reverse link, And the second optical signal into the reverse SISO signal and the MIMO signal, respectively, and transmit the restored SISO signal and the MIMO signal to the base station side.

The remote unit 2 restores the forward first optical signal and the second optical signal transmitted from the master unit 1 through the single optical line 3 to the forward SISO signal and the MIMO signal in the forward link, In the reverse link, the reverse SISO signal and the MIMO signal, which are received from the antenna side and are served at the same frequency as each other, are converted into a first optical signal and a second optical signal having opposite optical wavelengths, (3) to the master unit (1).

The master unit 1 according to the embodiment of the present invention includes a master RF unit (MRU) 100 and an analog optical module 200 as shown in FIG. can do.

The master RF unit (MRU) 100 may include a SISO signal processing unit (SISO RF) 110 and a MIMO signal processing unit 120.

The SISO signal processing unit 110 adjusts the intensity of the forward SISO (RF) signal transmitted from the base station in the forward link and outputs the signal to the analog optical module unit 200. In the reverse link, And adjusts the strength of the reverse SISO (RF) signal input from the base station and outputs the signal to the base station.

The MIMO signal processing unit 120 adjusts the intensity of the forward MIMO (RF) signal transmitted from the base station in the forward link and outputs it to the analog optical module unit 200. In the reverse link, And adjusts the strength of the reverse MIMO (RF) signal input from the base station and outputs the adjusted signal to the base station.

The analog optical module 200 may include an SISO signal conversion unit 210, a MIMO signal conversion unit 220, and an edge filter unit 230, as shown in FIG. 4 .

The SISO signal converting unit 210 may include a forward SISO signal converting unit 211 and a reverse SISO signal converting unit 212 as shown in FIG.

The forward SISO signal converting unit 211 converts the forward SISO (RF) signal inputted from the SISO signal processing unit 110 into a forward first optical signal having a predetermined first wavelength and outputs the converted first optical signal to the edge filter unit 230 And the reverse SISO signal converting unit 212 converts the first optical signal in the reverse direction inputted from the edge filter unit 230 into a reverse SISO (RF) signal and transmits the signal to the SISO signal processing unit 110.

For example, the forward SISO signal converting unit 211 may include a laser diode (LD) as a light emitting device for all-optical conversion, and the reverse SISO signal converting unit 212 may include a photo- And may include a photo diode (PD).

The MIMO signal converting unit 220 may include a forward MIMO signal converting unit 221 and a reverse MIMO signal converting unit 222, as shown in FIG.

The forward MIMO signal converting unit 221 converts the forward MIMO (RF) signal input from the MIMO signal processing unit 120 into a forward second optical signal having a predetermined second optical wavelength and outputs the converted second optical signal to the edge filter unit 230 And the reverse MIMO signal converting unit 222 converts the second optical signal in the reverse direction inputted from the edge filter unit 230 into a reverse MIMO (RF) signal, and transmits the reverse second MIMO signal to the MIMO signal processing unit 120.

For example, the forward MIMO signal converting unit 221 may include a laser diode (LD) as a light emitting device for all-optical conversion, and the reverse MIMO signal converting unit 222 may include a photo- And may include a photo diode (PD).

In the present embodiment, the forward SISO signal converter 211 and the forward MIMO signal converter 221 can set the first optical wavelength of the first optical signal and the second optical wavelength of the second optical signal different from each other have.

The reverse SISO signal converting unit 212 and the reverse MIMO signal converting unit 222 may be configured to have optical wavelengths corresponding to the reverse SISO signal converting unit 312 and the reverse MIMO signal converting unit 322, respectively.

The edge filter unit 230 filters the forward first and second optical signals output from the forward SISO signal converter 211 and the forward MIMO signal converter 221 on the forward link based on the set optical wavelength To the single optical line (3). On the reverse link, the first optical signal and the second optical signal in the reverse direction received through the single optical line (3) are separated from each other based on the set optical wavelength, To the forward MIMO signal converter 212 and the reverse MIMO signal converter 222, respectively.

Referring again to FIG. 4, the remote unit 2 may include an analog optical module 300 and a remote RF unit (RRU) 400.

The analog optical module 300 may include an SISO signal converting unit 310, a MIMO signal converting unit 320, and an edge filter unit 330, as shown in FIG. 4 .

The SISO signal converting unit 310 may include a forward SISO signal converting unit 311 and a reverse SISO signal converting unit 312 as shown in FIG.

The forward SISO signal converting unit 311 converts the forward first optical signal input from the edge filter unit 330 into a forward SISO (RF) signal and transmits the forward SISO signal to the SISO signal processing unit 410, (RF) signal input from the SISO signal processing unit 410 to a forward first optical signal having a predetermined first wavelength and transmit the converted first optical signal to the edge filter unit 330. [

For example, the forward SISO signal converting unit 311 may include a photodiode (PD) as a light receiving element for photoelectric conversion, and the reverse SISO signal converting unit 312 may include a laser as a light emitting element And may include a laser diode (LD).

The MIMO signal converting unit 320 may include a forward MIOM signal converting unit 321 and a reverse MIOM signal converting unit 322 as shown in FIG.

The forward MIMO signal converting unit 321 converts the forward second optical signal input from the edge filter unit 330 into a forward MIMO (RF) signal and transmits the forward optical MIMO signal to the MIMO signal processing unit 420, The MIMO signal processor 222 may convert the reverse MIMO (RF) signal input from the MIMO signal processor 420 into a second optical signal having a predetermined second optical wavelength and transmit the second optical signal to the edge filter unit 330.

For example, the forward MIMO signal converting unit 321 may include a photodiode (PD) as a light receiving element for photoelectric conversion, and the reverse MIMO signal converting unit 222 may include a laser as a light emitting element And may include a laser diode (LD).

In the present embodiment, the reverse SISO signal converter 312 and the reverse MIMO signal converter 322 can set the first optical wavelength of the first optical signal and the second optical wavelength of the second optical signal different from each other have.

The forward SISO signal converting unit 311 and the forward MIMO signal converting unit 321 may be set to have optical wavelengths corresponding to the forward SISO signal converting unit 211 and the forward MIMO signal converting unit 221, respectively.

The edge filter unit 330 filters the first optical signal and the second optical signal in the reverse direction output from the reverse SISO signal converter 312 and the reverse MIMO signal converter 322 on the reverse link based on the set optical wavelength To the single optical line (3). On the forward link, the first optical signal and the second optical signal in the forward direction received through the single optical line (3) are separated from each other based on the set optical wavelength, To the forward MIMO signal converter 311 and the forward MIMO signal converter 321, respectively.

The remote RF unit (RRU) 400 may include an SISO signal processing unit (SISO RF) 410 and a MIMO signal processing unit 420, as shown in FIG.

The SISO signal processing unit 410 adjusts the strength of the reverse SISO (RF) signal transmitted from the antenna ANT0 in the reverse link and transmits it to the analog optical module unit 300. In the forward link, 300 to the service area through the antenna ANT0 by adjusting the strength of the forward SISO (RF) signal inputted thereto.

The MIMO signal processing unit 420 adjusts the strength of the reverse MIMO (RF) signal transmitted from the antenna ANT0 in the reverse link and outputs the adjusted intensity to the analog optical module unit 300. In the forward link, 300 to the service area through the antenna ANT0 by adjusting the intensity of the forward MIMO (RF) signal inputted thereto.

According to the embodiment of the present invention, in the master unit 1, the optical wavelength of the light emitting element (LD) / light receiving element (PD) of the analog optical module unit 200 for converting the MU analog RF signal into the optical signal is SISO And an edge filter 230 are used to supply the two signals to one optical transmission line 3.

The remote unit 2 separates the optical signal inputted from the master unit 1 through the optical line 3 by using the edge filter 330 and then outputs the optical signal to the SISO signal converting unit 310 and the MIMO signal converting unit 320, respectively. The optical signals supplied to the SISO signal converting unit 310 and the MIMO signal converting unit 320 are converted into RF signals and supplied to the SISO RRU 410 and the MIMO RRU 420.

The edge filters 230 and 330 pass the wavelengths used in the SISO / MIMO signal converters 210, 220, 310 and 320 and isolate the other wavelengths so as to avoid interference with the respective wavelengths. That is, the SISO optical signal of the analog optical module unit 200 of the MU 1 is supplied only to the SISO signal conversion unit 310 to the analog optical module unit 300 of the RU 2, The MIMO optical signal of the optical module 200 is supplied only to the MIMO signal conversion unit 320 to the analog optical module unit 300 of the RU 2. [

Therefore, according to the embodiment of the present invention, the SISO signal and the MIMO signal can be transmitted through the same RF signal, and the SISO signal and the MOMO signal can be transmitted through one optical line.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of equivalents should be interpreted as being included in the scope of the present invention.

1: Master Unit (MU)
2: Remote unit (RU)
3: optical line
100: Master RF Unit (MRU)
110: SISO signal processing unit (SISO RF)
120: MIMO signal processing unit (MIMO RF)
200: Analog optical module module
210: SISO signal conversion unit
211: forward SISO signal converter (LD)
212: Reverse SISO signal converter (PD)
220: MIMO signal conversion unit
221: forward MIMO signal converting unit (LD)
222: Reverse MIMO signal converting unit (PD)
230: Edge filter unit
300: Analog Optic Module
310: SISO signal conversion unit
311: forward SISO signal converter (PD)
312: Reverse SISO signal converter (LD)
320: MIMO signal conversion unit
321: forward MIMO signal converting unit (PD)
322: Reverse MIMO signal converting unit (LD)
330: Edge filter section
400: Remote RF Unit (MRU)
410: SISO signal processing unit (SISO RF)
420: MIMO signal processing unit (MIMO RF)

Claims (11)

A master unit for converting the forward SISO signal and the MIMO signal received from the base station side into a first optical signal and a second optical signal having different optical wavelengths and transmitting the same to a remote unit (RU) through a single optical line; (Master Unit: MU); And
A remote unit (RU) for transferring the first optical signal and the second optical signal in the forward direction transferred from the master unit through the single optical line to the forward SISO signal and the MIMO signal, Wherein the MIMO service is a wireless communication device. The method according to claim 1,
Wherein the remote unit converts the reverse SISO signal and the MIMO signal received from the antenna side into a first optical signal and a second optical signal having opposite optical directions with different optical wavelengths and transmits the first optical signal and the second optical signal to the master unit through a single optical line A wireless communication device for a MIMO service. 3. The method of claim 2,
Wherein the master unit restores the first optical signal and the second optical signal in the reverse direction, which are transmitted through the single optical line from the remote unit, to the reverse SISO signal and the MIMO signal, respectively, and transmits the restored SISO signal and the MIMO signal to the base station side. Lt; / RTI > The method according to claim 1,
The master unit includes a master RF unit (MRU) including an SISO signal processing unit and a MIMO signal processing unit for adjusting and outputting the strengths of forward SISO signals and MIMO signals transmitted from the base station, respectively. And an SISO signal converter for converting the forward SISO signal and the MIMO signal output from the SISO signal processor and the MIMO signal processor into a first optical signal and a second optical signal having different optical wavelengths, And an edge optical filter module for filtering the first optical signal and the second optical signal in the forward direction and supplying the first optical signal and the second optical signal to a single optical line. 5. The method of claim 4,
The remote unit includes an edge filter unit for separating the first optical signal and the second optical signal in the forward direction received through the single optical line from each other, and a second optical unit for dividing the separated first optical signal and the second optical signal into An analog optical module unit including an SISO signal conversion unit and a MIMO signal conversion unit for converting the forward MIMO signal and the SISO signal; And a remote RF unit (RRU) including an SISO signal processing unit and a MIMO signal processing unit for adjusting the strength of the converted forward SISO signal and the MIMO signal to output to the antenna side, respectively, Wireless communication device for service. 6. The method of claim 5,
Wherein the SISO signal converting unit and the MIMO signal converting unit of the master unit include first and second light emitting devices, respectively. 6. The method of claim 5,
Wherein the SISO signal converting unit and the MIMO signal converting unit of the remote unit include first and second light receiving elements, respectively. The method according to claim 1,
The remote unit includes a remote RF unit (RRU) including an SISO signal processing unit and a MIMO signal processing unit for adjusting and outputting the strength of the reverse SISO signal and the MIMO signal transmitted from the antenna side, respectively. And an SISO signal converter for converting the reverse SISO signal and the MIMO signal respectively output from the SISO signal processor and the MIMO signal processor into a first optical signal and a second optical signal having opposite optical wavelengths, And an edge filter unit for filtering the first optical signal and the second optical signal in the reverse direction and supplying the first optical signal and the second optical signal to a single optical line. 9. The method of claim 8,
The master unit includes an edge filter unit for separating the first optical signal and the second optical signal in the reverse direction received through the single optical line from each other and a second filter unit for dividing the separated first optical signal and the second optical signal into An analog optical module unit including an SISO signal conversion unit and a MIMO signal conversion unit for converting the backward MIMO signal and the SISO signal; And a master RF unit (MRU) including an SISO signal processing unit and a MIMO signal processing unit for adjusting the strength of the converted reverse SISO signal and the MIMO signal to output to the base station side, respectively. Wireless communication device for service. 10. The method of claim 9,
Wherein the SISO signal converting unit and the MIMO signal converting unit of the remote unit include first and second light emitting devices, respectively. 10. The method of claim 9,
Wherein the SISO signal converting unit and the MIMO signal converting unit of the master unit include first and second light receiving elements, respectively.

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