KR20060072837A - In-building distribution repeating system by using digital signal processing - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal processing apparatus of a wireless communication system, and converts a high frequency signal received from a base station or a communication system into a digital signal by a wired or wireless connection, and then unnecessary interference signals included in the high frequency signal by a digital signal processing unit. The present invention relates to a distributed wireless relay system in the premises by digital signal processing which can improve the communication quality by removing the signal.

In the conventional relay apparatus which receives a high frequency signal from a base station and retransmits it to a shaded area, in addition to a signal of a base station to be retransmitted through a receiving antenna, a plurality of unintended signals from other base stations or terminals are mixed or transmitted to a transmitting antenna. Because of the feedback, the communication quality is very poor due to the multiple interference signals.

The present invention is to solve the problems of the prior art as described above, by converting a high frequency signal received from a base station or a communication system by a wired or wireless connection to a digital signal and unnecessary to include in the high frequency signal by the digital signal processor The present invention provides a distributed wireless local relay system by digital signal processing which eliminates interference signals and connects a plurality of expansion units and remote units by low-cost communication lines to improve communication quality and retransmit high quality signals.

Description

In-building distribution repeating system by using digital signal processing

1 is a diagram illustrating a signal transmission and reception state of a relay device in a base station environment in which a relay device is installed.

Figure 2 is a diagram showing a premises wireless relay system in which the relay device according to the prior art is installed.

FIG. 3 is a diagram illustrating a distributed wireless relay system in a premises using digital signal processing according to the present invention. FIG.

Figure 4 is a connection diagram of the premises wireless distributed relay system by digital signal processing according to the present invention.

5 is a block diagram showing a main unit of the premises wireless distributed relay system by digital signal processing according to the present invention;

Fig. 6 is a block diagram showing an expansion unit of the premises wireless distributed relay system by digital signal processing according to the present invention.

7 is a block diagram showing a remote unit of the premises wireless distributed relay system by digital signal processing according to the present invention;

8 is a block diagram showing an unnecessary signal elimination algorithm of an on-premises wireless distributed relay system by digital signal processing according to the present invention.

* Explanation of symbols for the main parts of the drawings

100. Repeater 101. Receiving Antenna

102. Transmission antennas 200, 300. Large buildings

201.Main repeater 202. First antenna

203, 203-1, 203-2, 203-3. First to nth part repeater

204. Second antenna 205. Terminal

206. Signal distribution means 207. Coaxial track

301. Main Unit 302. Link Antenna

303, 303-1, 303-2, 303-3. 1st to nth expansion unit

304, 304-1, 304-2. 1st to nth remote unit

304. Terminal 306. Transmission line

401, 608. Diplexers 402, 402-1. First and second duplexers

403, 403-1. First and second downconverters 404, 404-1. First and Second A / D Converters

405. Unnecessary signal removing unit 406, 506. Framer

407, 407-1, 407-2. First to nth Serializer / Deserializer

408, 408-1, 408-2, 408-3, 408-4, 408-5. 1st to nth transceiver

409, 409-1, 409-2, 409-3, 409-4, 409-5. 1st to nth output connectors

410, 410-1, 410-2. First to nth deframers

411, 511. Channel controller 412, 612. Control circuit section                 

413, 513. Summer 414. Digital Filter

415, 415-1. First and second D / A converters 416, 416-1. First and second upconverters

501, 501-1. First and second input connector

503, 603. Input Serializer / Deserializer

502, 502-1. First and second input transceiver

507, 507-1, 507-2. First to nth Serializer / Deserializer

508, 508-1, 508-2, 508-3, 508-4, 508-5. 1st to nth transceiver

509, 509-1, 509-2, 509-3, 509-4, 509-5. 1st to nth output connectors

510, 510-1, 510-2. First to nth deframers

601, 601-1, 601-2. 1st to 3rd input connector

602, 602-1. First and Second Input Transceivers 604. Framers / Deframers

605, 605-1. First and second D / A converters 606, 606-1. First and second upconverters

607, 607-1. First and second duplexers 609. Remote antenna

610, 610-1. First and second downconverters 611, 611-1. First and Second A / D Converters

613. Power Supply 614. Clock

700. PN removal circuit section 701, 703. First and second digital mixers

702. First Digital Filters 704 and 710. Third and Fourth Digital Mixers

705, 705-1. Second Digital Filter 706. PN Detector                 

707. PN Tracker 708. PN Generator

709. Baseband Filter. 711. Sum / Subtractor.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal processing apparatus of a wireless communication system, and converts a high frequency signal received from a base station or a communication system into a digital signal by a wired or wireless connection, and then unnecessary interference signals included in the high frequency signal by a digital signal processing unit. The present invention relates to a distributed wireless relay system in the premises by digital signal processing which can improve the communication quality by removing the signal.

In the conventional relay apparatus which receives a high frequency signal from a base station and retransmits it to a shaded area, in addition to a signal of a base station to be retransmitted through a receiving antenna, a plurality of unintended signals from other base stations or terminals are mixed or transmitted to a transmitting antenna. Because of the feedback, the communication quality is very poor due to the multiple interference signals.

1 is a diagram illustrating a signal transmission / reception state of a relay device in a base station environment in which a relay device is installed, and a shaded area is generated in an existing service area (shown by a dotted line) of the base station 1 (BTS1) and is signaled by the relay device 100. It shows the case of retransmitting. In general, a cell-type mobile communication system is operated by a plurality of base stations covering a predetermined area are installed adjacent to each other to reuse the assigned channel frequency. That is, as shown in FIG. 1, base station 2 (BTS2) and base station 3 (BTS3) having respective service areas are adjacent to each other, and although not shown, a plurality of base stations are arranged to establish a communication network. .

In FIG. 1, when the signal of the base station 1 is retransmitted to the shadow area using the relay device 100, a signal f _B1 of the base station 1 to be retransmitted is basically received and transmitted to the reception antenna 101 of the relay device. The signal f _BIR retransmitted by the antenna 102 is output, but in an actual propagation environment, the reception antenna 101 together with the signals f _B2 , f _B3 ,... The signal f _BIR retransmitted to 102 is fed back and received.

Accordingly, as described above, in the relay apparatus according to the related art, in addition to the signal of the base station to be retransmitted through the receiving antenna, a plurality of unintended signals from other base stations or terminals are mixed or the signal transmitted to the transmitting antenna is fed back. There is a problem that the communication quality is very poor due to the interference signal. That is, in addition to the signal to be retransmitted (indicated by a solid line) as shown in FIG. 1, a plurality of unnecessary signals (indicated by a dotted line) are mixed.

The present invention is to solve the problems of the prior art as described above, by converting a high frequency signal received from a base station or a communication system by a wired or wireless connection to a digital signal and then included in the high frequency signal by a digital signal processor It provides a distributed wireless relay system in the premises by digital signal processing which eliminates the interference signal and connects a number of expansion units and remote units by low-cost communication lines to improve communication quality and retransmit high quality signals. There is a purpose.

In order to achieve the above object, the present invention provides a device for processing and retransmitting a signal received from a base station or a communication system by a wired or wireless connection, down converting the high-frequency signal received from the base station or communication system to an intermediate frequency After converting the digital signal converted by the A / D converter into a baseband digital signal, the digital signal processor removes the unnecessary signal included in the high frequency signal and connects an expansion unit or a remote unit to the output terminal. At least one expansion unit (303, 303-1, 303-2, 303-3) connected to the main unit to carry the baseband digital signal, the remote unit being connected to an output terminal thereof; Is connected to the expansion unit and converts the baseband digital signal into a digital signal. At least one remote unit 304, 304-1, 304-2 which up-converts the converted analog signal to an intermediate frequency, and then converts the analog signal into a high frequency signal and retransmits it; And a transmission line 306 connecting the main unit and the expansion unit, the main unit and the remote unit, the expansion unit and the remote units.

The main unit includes: a link antenna 302 for transmitting and receiving high frequency signals with different communication systems or base stations; and a diplexer connected to the link antenna to pass two frequency bands of different communication systems or base stations. And first and second duplexers 402 and 402-1 which pass through two frequency bands output from the diplexer and combine transmission and reception paths, respectively; and reception paths of the first and second duplexers; First and second downconverters 403 and 403-1 respectively connected to the first and second downconverters 403 and 403-1 for downconverting a high frequency signal to an intermediate frequency; and converting an analog intermediate frequency signal output from the first and second downconverters into a digital signal. First and second A / D converters 404 and 404-1; and an unnecessary signal removing unit 405 that receives digital signals from the first and second A / D converters and removes unnecessary signals; and the unnecessary signals A framer 406 for reconstructing the output signal of the remover into a form suitable for transmission; and first to n-th serializer / deserializers 407 and 407-1 for distributing up to eight output signals of the framer to serialize them; And 407-2); and first to nth transceivers 408, 408-1, and 408-2 for transmitting and receiving digital signals of two frequency bands branched from the first to nth serializers / deserializers respectively. 408-3, 408-4, and 408-5; and first to nth output connectors 409, 409-1, 409-2, and 409 respectively connected to the first to nth transceivers and coupled to a transmission line. -3, 409-4, 409-5) and the first to nth deframers 410 for restoring the reverse digital signal output by the first to nth serializer / deserializer by a control signal from the outside. 410-1, 410-2); and the first to nth deframers A channel controller 411 for applying a call; a control circuit unit 412 for applying a control signal to the channel controller; and an adder 413 for combining the output signals of the first to nth deframers in one path. And first and second D / A converters 415 and 415-1 for converting digital signals of two frequency bands branched from the summer and output into analog signals, respectively; And first and second up-converters 416 and 416-1 that receive analog signals from the first and second D / A converters and up-convert them into high-frequency signals, respectively.

The expansion unit may include: first and second input connectors 501 and 501-1 coupled to a pair of first to nth output connectors of the main unit by a transmission line; and the first and second inputs. First and second input transceivers 502 and 502-1 respectively connected to the connector for transmitting and receiving digital signals of two frequency bands, respectively; and an input serial connected to and serialized to the first and second input transceivers. A riser / deserializer 503; and a framer 506 for reconstructing the output signal of the input serializer / deserializer into a form suitable for transmission; and first to eight output signals of the framer to be serialized. Digital of two frequency bands branched from the nth serializer / deserializer 507, 507-1, 507-2 and the first to nth serializer / deserializer; First to nth transceivers 508, 508-1, 508-2, 508-3, 508-4, and 508-5 for transmitting and receiving signals, respectively; and transmission lines connected to the first to nth transceivers, respectively. First through n th output connectors 509, 509-1, 509-2, 509-3, 509-4, and 509-5 that are coupled with the reverse direction output by the first through n th serializers / deserializers. First to nth deframers 510, 510-1 and 510-2 for restoring a digital signal by a control signal from the outside; and a channel controller 511 for applying a control signal to the first to nth deframers. And an adder 513 which combines the output signals of the first to nth deframers into one path and sends them to the input serializer / deserializer.

The remote unit is connected to the outside and the first and second input connectors (601, 601-1) coupled by a transmission line with any one of the first to n-th output connector of the main unit or expansion unit A third input connector 601-2 receiving power; first and second input transceivers 602 and 602 connected to the first and second input connectors, respectively, for transmitting and receiving digital signals in two frequency bands, respectively. -1); and an input serializer / deserializer 603 connected to the first and second input transceivers to serialize the output signal; and reconstructing an output signal of the input serializer / deserializer into a form suitable for transmission or a reverse digital signal. A framer / deframer 604 for restoring the signal by a control signal from the outside; and a control circuit unit 612 for applying a control signal to the premer / deframer; and the framer. First and second D / A converters 605 and 605-1 for converting the digital signals of the two frequency bands output from the / deframer into analog signals, respectively; and the analog from the first and second D / A converters. First and second upconverters 606 and 606-1 that receive signals and upconvert them to high frequency signals, respectively; and a first pass through a high frequency signal output from the first and second upconverters, respectively, and combining transmission and reception paths; And a second duplexer (607, 607-1); and a diplexer (608) for combining the signals of the first and second duplexers to pass two frequency bands of different communication systems or base stations. A remote antenna 609 connected to the flexor for serving two frequencies of different communication systems or base stations in a shaded area; and a different communication system or base passing through the first and second duplexers respectively; First and second downconverters 610 and 610-1 for down converting the high frequency signals of the two frequencies into intermediate frequencies, respectively; and converting the analog intermediate frequency signals of the first and second downconverters into digital signals, respectively. An A / D converter (611, 611-1) to be sent to the framer / deframer, and a clock unit (614) for extracting clock data from the input serializer / deserializer to generate a synchronization clock; And a power supply unit 613 that receives power from the third input connector and converts the power into an appropriate voltage.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a diagram illustrating a premises wireless relay system in which a relay apparatus according to the related art is installed, and FIG. 3 is a diagram showing a premises wireless distributed relay system by digital signal processing according to the present invention. First, in the relay apparatus according to the prior art as shown in FIG. 2, only one relay apparatus is independently used in a shaded region to be serviced, or a plurality of small shaded regions such as a large building 200 adjacent to the shaded region are provided. If present, a plurality of secondary relays 203, 203-1, 203-2, and 203-3 are used in one main relay 201.

However, in the above-described method, the cost is increased because the main relay and the sub relay are connected by using the coaxial line 207 and the signal distribution means 206. In addition, since the signal transmitted from the main repeater to the secondary repeater is a high frequency signal or an analog signal converted to an intermediate frequency, not only the transmission loss increases but also the number of additional repeaters that can be expanded is limited. Since unnecessary signals are not removed, there is a problem that call quality is degraded. Moreover, when the large building is a high floor and has a large floor area, there is another problem that the subsidiary repeater cannot serve the entire floor.

In contrast, the relay apparatus according to the present invention as shown in FIG. 3 removes unnecessary signals included in the high frequency signal received from the base station or the communication system by the link antenna 302 or the wired connection by the digital signal processing unit, One main unit 301 to which an expansion unit or a remote unit is connected, and at least one expansion unit 303, 303-1, 303-2, 303-3 connected to the main unit but to which a remote unit is connected; And at least one remote unit 304, 304-1, 304-2 connected to the expansion unit and retransmitting a high frequency signal to a corresponding shaded area, wherein the main unit and the expansion unit, the main unit and the remote unit, Expansion units and remote units are configured to be connected by a low cost transmission line 306.

4 is a connection diagram of the premises wireless distributed relay system by digital signal processing according to the present invention. As described above, the main unit 301 has up to eight expansion units or remote units by the transmission line 306. Up to eight remote units are connected to the expansion units 303, 303-1, and 303-2 (see symbol B in FIG. 4). The expansion units 303, 303-1, and 303-2 are provided with connectors for relaying two bands (see symbol C in FIG. 4), and the remote units 304 and 304 in the same manner. -1, 304-2 is also provided with connectors to relay the two bands, the remote unit 304, 304-1, 304-2 is the main unit or expansion unit without using a separate power source It is further provided with a power connector so that it can be powered from (see symbol D in FIG. 4).

FIG. 5 is a block diagram illustrating a main unit of a premises wireless distributed relay system using digital signal processing according to an embodiment of the present invention, and includes a link antenna 302 and a link antenna for transmitting and receiving high frequency signals with different communication systems or base stations. A diplexer 401 connected to pass two frequency bands of different communication systems or base stations, and a first and a second pass through the two frequency bands output from the diplexer and combining transmission and reception paths, respectively; First and second downconverters 403 and 403-1 connected to a second duplexer 402 and 402-1 and receiving paths of the first and second duplexers, respectively, to down-convert a high frequency signal to an intermediate frequency; First and second A / D converters 404 and 404-1 for converting analog intermediate frequency signals output from the first and second downconverters into digital signals, and the first and second A / D conversions. A unwanted signal removing unit 405 for receiving a digital signal from the digital signal and removing the unnecessary signal, a framer 406 for reconstructing the output signal of the unnecessary signal removing unit into a form suitable for transmission, and an output signal of the framer First to nth serializers / deserializers 407, 407-1, and 407-2 which are divided into eight and serialized, respectively, are branched from the first to nth serializers and deserializers, and are outputted. First to nth transceivers 408, 408-1, 408-2, 408-3, 408-4, and 408-5 for transmitting and receiving digital signals of two frequency bands, respectively, to the first to nth transceivers. First to nth output connectors 409, 409-1, 409-2, 409-3, 409-4, and 409-5 respectively connected to the transmission line and connected to the first to n-th serializer / deserializer. Control signal from the outside of reverse digital signal output by First to nth deframers 410, 410-1 and 410-2 restored by the channel controller 411 for applying a control signal to the first to nth deframers, and to the channel controller. A control circuit unit 412 for applying a control signal, an adder 413 for combining the output signals of the first to nth deframers into one path, and digital signals of two frequency bands branched from the adder And first and second D / A converters 415 and 415-1 for converting a signal into an analog signal, respectively, and the first and second receivers for receiving an analog signal from the first and second D / A converters and upconverting them into a high frequency signal, respectively. 2 upconverters 416 and 416-1.

The link antenna 302 has a dual band or a broadband function to transmit and receive two frequency bands, and the diplexer 401 is connected to the link antenna to transmit two frequency bands of different communication systems or base stations. Pass it through. In addition, two frequency bands output from the diplexer are respectively passed by the first and second duplexers 402 and 402-1 so that a transmit / receive path is combined. The first and second downconverters 403 and 403-1 and the first and second A / D converters 404 and 404-1 are connected so that the two high frequency signals are down-converted to an intermediate frequency and then digital again. Is converted into a signal.

The unnecessary signal removing unit 405 receives the digital signals from the first and second A / D converters, removes the unnecessary signals by digital signal processing, which will be described later with reference to FIG. 8, and has a form suitable for transmission via the framer 406. Reconstructing, the output signal of the framer is distributed up to eight and serialized by the first to nth serializer / deserializers 407, 407-1, and 407-2, respectively. Subsequently, the digital signals of two frequency bands branched from the first to nth serializers / deserializers are output to the first to nth transceivers 408, 408-1, 408-2, 408-3, 408-4, 408-5) and the extensions described below by the first to nth output connectors 409, 409-1, 409-2, 409-3, 409-4, and 409-5 corresponding to the transmission lines respectively corresponding thereto. Send / receive with unit or remote unit.

Here, the first transceiver 408 and the second transceiver 408-1, the third transceiver 408-2 and the fourth transceiver 408-3, the n-1 transceiver 408-4 and the nth The transceivers 408-5 are configured to be paired with each other, wherein the first transceiver 408, the third transceiver 408-2, and the n-1-1 transceiver 408-4 have a low frequency band (for example, a domestic PCS). The second transceiver 408-1, the fourth transceiver 408-3, and the nth transceiver 408-5 are for a high frequency band (e.g., IMT-2000), or vice versa. Can be used as That is, two transceivers connected to one serializer / deserializer are for different frequency bands, and the main unit can be connected with up to eight pairs of these transceivers.                     

On the other hand, in the case of the reverse signal input to the first to n-th output connectors (409, 409-1, 409-2, 409-3, 409-4, 409-5), the first to n-th transceiver 408, 408-1, 408-2, 408-3, 408-4, and 408-5, digital signals of two frequency bands are transmitted to the first to nth serializer / deserializer, and the reverse digital signal is Receiving a control signal from the first to n-th deframer (410, 410-1, 410-2) through the operation opposite to the framer 406 to restore the form of the signal.

The output signals of the first to nth deframers 410, 410-1, and 410-2 are summed by a summer 413, and are divided into digital signals of two frequency bands as described above. Is delivered to. The digital filter 414 may improve the out-of-band signal suppression by filtering the bandwidth of each communication method (1.23 MHz for CDMA, 5 MHz for WCDMA, etc.), and increase signal purity and efficiency of a high output amplifier. A Finite Impulse Response (FIR) method or an Infinite Impulse Response (IIR) method may be used.

In addition, a control signal is applied to the first to n-th deframers 410, 410-1, and 410-2 from the control circuit unit 412 via the channel controller 411. According to an embodiment of the present invention, a function of synchronizing the output signals of the deframers by UART (Universal Asynchronous Receiver Transmitter) communication and controlling the combiner 413 to be combined into one path is provided. do. Since the synchronization function performed by the control circuit unit 412 is obvious to those skilled in the art, the detailed description of the present invention has not been shown in the description and the description thereof.

The digital signals of the two frequency bands output from the digital filter 414 are converted into analog signals by the first and second D / A converters 415 and 415-1, respectively, and then the first and second D signals. An analog signal is received from the / A converter, and is then upconverted into a high frequency signal through the first and second upconverters 416 and 416-1. Here, according to an embodiment of the present invention, the output of the first upconverter 416 is input to the first duplexer 402 as a low frequency band (for example, a domestic PCS), and the second upconverter 416-1. ) Is input to the second duplexer 402-1 as a high frequency band (eg, IMT-2000).

6 is a block diagram showing an expansion unit of the premises wireless distributed relay system by digital signal processing according to the present invention. The first and second input connectors 501 and 501-1 of the expansion unit according to the invention are connected to the first and second output connectors 409 and 409-1, third and fourth of the main unit by a transmission line. Any one of eight pairs, such as the output connectors 409-2 and 409-3, the n-th and n-th output connectors 409-4 and 409-5, is connected. When connected in this way, the framer 506 connected to the rear end via the input serializer / deserializer 503 is reconfigured into a form suitable for transmission, and the output signal of the framer is distributed to a maximum of eight first to n-th serializers. And serialized by the deserializers 507, 507-1, and 507-2, respectively.

The digital signals of the two frequency bands branched from the first to nth serializers / deserializers are output to the first to nth transceivers 508, 508-1, 508-2, 508-3, 508-4, and 508-. 5) and the remote unit described later by the first to nth output connectors 509, 509-1, 509-2, 509-3, 509-4, 509-5 corresponding to these and coupled to the transmission line, respectively; It is sent and received. In this case, the expansion unit according to the present invention includes the first and second input connectors 501 and 501-1, the first and second input transceivers 502 and 502-1, and the input serializer / deserializer 503. Since the rest of the configuration and operation is the same as the main unit, the following description is omitted.

7 is a block diagram showing a remote unit of the premises wireless distributed relay system by digital signal processing according to the present invention. The first and second input connectors 601 and 601-1 of the remote unit according to the present invention are connected to the first and second output connectors 409 and 409-1 and third of the main unit or the expansion unit by a transmission line. And eight pairs of fourth output connectors 409-2 and 409-3, n-1 and nth output connectors 409-4 and 409-5, and the like. When connected in this way, it is reconfigured into a form suitable for transmission by the framer / deframer 604 connected to the rear end via the input serializer / deserializer 603, and outputs two frequency bands from the framer / deframer 604. Digital signals are converted into analog signals by the first and second D / A converters 605 and 605-1, respectively, and then receive analog signals from the first and second D / A converters. Up-converters 606 and 606-1 are respectively up-converted into high frequency signals.

On the contrary, in the case of the reverse signal, the high frequency signals of two frequencies of different communication systems or base stations passing through the first and second duplexers 607 and 607-1, respectively, are transmitted to the first and second downconverters 610,. 610-1) down-converts to an intermediate frequency, and converts the signal into a digital signal by the A / D converters 611 and 611-1 to transfer the digital signal to the framer / deframer 604. Here, the framer / deframer 604 is provided with a channel control terminal for receiving a control signal from an external control circuit unit 612, that is, a UART terminal as in the embodiment of the present invention, and the input serializer / deserializer. And a clock unit 614 for extracting clock data from the clock data to generate a synchronization clock, and a power unit 613 for receiving power from the third input connector and converting the power to an appropriate voltage.

FIG. 8 is a block diagram illustrating an unnecessary signal elimination algorithm of an on-premises wireless distributed relay system by digital signal processing according to the present invention. A CDMA (IS-95, CDMA2000, WCDMA, etc.) signal and other standards converted from a butti analog signal to a digital signal by the A / D converters 404 and 404-1 of FIG. The baseband signal is frequency-converted by 701, and the basebanded I and Q signals are output by the first digital filter 702, respectively.

Further, the basebanded I and Q signals are branched so that only signals of individual channels (individual FA in case of CDMA) are passed by the second digital filters 705 and 705-1, respectively, and the individual FA signals are PN detectors. 706 and PN tracker 707 are simultaneously input. The PN detector 706 detects a pilot or a preamble signal of each signal from the multipath signals of multiple base stations or base stations to be retransmitted, thereby determining time delay information (t _d ) and phase of each pilot signal. Information ? And amplitude information A are extracted. The time delay, phase, and amplitude information is passed to the PN tracker 707 to continuously track t _d , Φ , A of each pilot that changes over time. The results tracked by the PN tracker 707 are forwarded to a PN generator 708, which uses the results to generate a PN signal to remove and the generated signal is a baseband filter 709. By filtering only the individual FA band and then input to the sum / subtractor 710 to remove the unnecessary signal.

That is, when time delay, phase, and amplitude information of a multipath signal of a base station to be retransmitted by the PN detector 706 and a signal received from a plurality of base stations or terminals is detected, the PN tracker 707 may detect the information. The same kind of information (t _d , Φ , A) is continuously tracked from the pilots of the signals that change over time based on the results, and the PN generator 708 uses the result to remove the PN signal to be removed. It generates and passes it through the sum / subtracter 711 so that unnecessary signals are removed and only the signal from the intended base station is relayed.

As can be seen in FIG. 8, the PN tracker 707, the PN generator 708, and the baseband filter 709 constitute the PN removal circuit unit 700 as an aggregate, and the PN removal circuit unit 700. ) Is provided for each FA to eliminate unnecessary signals for each FA, and the relay device according to the present invention is not limited to retransmitting only a single FA.

Along with this, the present invention has been described above using an Unshielded Twisted Pair (UTP) cable connected to an RJ45 type connector as a transmission line as shown in FIG. 4, but the present invention is not limited thereto, and a digital signal is transmitted. Various types of transmission lines that may be used may be used, such as high frequency coaxial cables, optical lines, wireline telephone lines, CATV public hearing networks, and the like.

Therefore, the relay device according to the present invention can be easily operated by the operator considering the radio wave environment of the shadow area, and can be widely applied to various relay systems only by changing the software by digital signal processing, and using digital signal processing technology. By eliminating unnecessary signals from the baseband, broadband is possible, which overcomes the limitation of the narrowband of the conventional analog interference cancellation system. That is, the present invention is a technology that analyzes the signal for each channel by digital signal processing of the entire bandwidth, and is not limited to a specific system, and can be widely applied to various mobile communication methods (IS95, GSM, CDMA2000, WCDMA, etc.) through software upgrade. Can be.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, the present invention converts a high frequency signal received from a base station or a communication system into a digital signal through a wired or wireless connection, and then removes unnecessary interference signals included in the high frequency signal by a digital signal processing unit, thereby inexpensive communication lines. By connecting a number of expansion units and remote units, it is possible to improve the communication quality and to retransmit high quality signals, and to make operators easy to operate the network considering the radio wave environment of the shadow area and to digital signals for various relay systems. It can be widely applied only by software change by processing, and wideband can be achieved because unnecessary signal is removed from baseband by using digital signal processing technology.

Claims (10)

An apparatus for processing and retransmitting a signal received from a base station or a communication system by a wired or wireless connection, Down-converting the high frequency signal received from the base station or the communication system to an intermediate frequency, converting the digital signal converted by the A / D converter into a baseband digital signal, and then removing the unnecessary signal included in the high frequency signal by the unnecessary signal removing unit One main unit to which the signal is removed and to which an expansion unit or a remote unit is connected; At least one expansion unit connected to the main unit to transmit the baseband digital signal, the remote unit being connected to an output terminal thereof; At least one remote unit connected to the expansion unit for converting the baseband digital signal into a digital signal, up-converting the analog signal converted by the D / A converter to an intermediate frequency, and converting the signal into a high frequency signal and retransmitting the signal; And And a transmission line and a connector connecting the main unit and the expansion unit, the main unit and the remote unit, and the expansion unit and the remote unit. The method of claim 1, wherein the main unit, A link antenna for transmitting and receiving high frequency signals with different communication systems or base stations; A diplexer connected to the link antenna for passing two frequency bands of different communication systems or base stations; First and second duplexers each passing two frequency bands output from the diplexer and combining transmission and reception paths; First and second downconverters connected to receive paths of the first and second duplexers, respectively, for downconverting a high frequency signal to an intermediate frequency; First and second A / D converters for converting analog intermediate frequency signals output from the first and second downconverters into digital signals; An unnecessary signal removing unit receiving the digital signals from the first and second A / D converters and removing the unnecessary signals; A framer for reconstructing the output signal of the unnecessary signal removing unit into a form suitable for transmission; First to nth serializers / deserializers each of which output signals of the framers are divided into a maximum of eight and serialize them; First to nth transceivers for respectively transmitting and receiving digital signals of two frequency bands branched from the first to nth serializers / deserializers; First to nth output connectors respectively connected to the first to nth transceivers and coupled to a transmission line; First to nth deframers for restoring a reverse digital signal output by the first to nth serializer / deserializer by a control signal from the outside; A channel controller for applying a control signal to the first to nth deframers; A control circuit unit controlling the channel controller; A summer for combining the output signals of the first to nth deframers in one path; First and second D / A converters for converting digital signals of two frequency bands branched from the adder into analog signals, respectively; And And a first and a second upconverter for receiving an analog signal from the first and second D / A converters and upconverting the radio signal to a high frequency signal, respectively. The method according to claim 1 or 2, wherein the unnecessary signal removing unit, A PN detector which receives the baseband digital signal, detects a pilot or a known signal of each signal, and extracts time delay information, phase information, amplitude information, and transmits the extracted information to a PN tracker; Based on the time delay information, phase information, and amplitude information detected by the PN detector, time delay information, phase information, and amplitude information of each pilot or known signal that changes with time are tracked, and the result is transmitted to the PN generator. Delivering at least one PN tracker; and At least one PN generator for generating a pseudo noise signal to be removed using the result received from the PN tracker; and At least one baseband filter for filtering each PN signal generated by the PN generator for each FA; and And a sum / subtractor for removing unnecessary signals by adding / subtracting the output signal of the baseband filter to the output signal of the digital filter. And a PN elimination circuit unit comprising the PN tracker, the PN generator, and the baseband filter as one aggregate. The method according to claim 1 or 2, An extension unit or a remote unit is connected to the main unit. The method of claim 1, wherein the expansion unit, First and second input connectors coupled by a transmission line to any one of the first to nth output connectors of the main unit; First and second input transceivers respectively connected to the first and second input connectors to transmit and receive digital signals of two frequency bands, respectively; An input serializer / deserializer connected to and serialized to the first and second input transceivers; A framer for reconstructing the output signal of the input serializer / deserializer into a form suitable for transmission; First to nth serializers / deserializers each of which output signals of the framers are divided into a maximum of eight and serialize them; First to nth transceivers for respectively transmitting and receiving digital signals of two frequency bands branched from the first to nth serializers / deserializers; First to nth output connectors respectively connected to the first to nth transceivers and coupled to a transmission line; First to nth deframers for restoring a reverse digital signal output by the first to nth serializer / deserializer by a control signal from the outside; A channel controller for applying a control signal to the first to nth deframers; And And a combiner for combining the output signals of the first to nth deframers into one path and sending the combined output signals to the input serializer / deserializer. The method of claim 5, And the remote unit is connected to the expansion unit. The method of claim 1, wherein the remote unit, First and second input connectors coupled by a transmission line to any one of the first to nth output connectors of the main unit or expansion unit; A third input connector connected to the outside and receiving power; First and second input transceivers respectively connected to the first and second input connectors to transmit and receive digital signals of two frequency bands, respectively; An input serializer / deserializer connected to and serialized to the first and second input transceivers; A framer / deframer that reconstructs the output signal of the input serializer / deserializer into a form suitable for transmission or restores a reverse digital signal by a control signal from an external source; A control circuit unit for applying a control signal to the premer / deframer; First and second D / A converters for converting digital signals of two frequency bands output from the framer / deframer into analog signals, respectively; First and second up-converters which receive analog signals from the first and second D / A converters and up-convert them into high-frequency signals, respectively; First and second duplexers that pass high-frequency signals output from the first and second upconverters, respectively, and combine transmission and reception paths; A diplexer combining the signals of the first and second duplexers to pass two frequency bands of different communication systems or base stations; A remote antenna connected to the diplexer for serving two frequencies of different communication systems or base stations in a shaded area; First and second downconverters for down-converting high frequency signals of two frequencies of different communication systems or base stations respectively passing through the first and second duplexers to intermediate frequencies, respectively; An A / D converter converting the analog intermediate frequency signals of the first and second downconverters into digital signals and sending them to the framer / deframer, respectively; A clock unit configured to generate clock signals by extracting clock data from the input serializer / deserializer; And And a power supply unit receiving power from the third input connector and converting the power into an appropriate voltage. The method according to any one of claims 2, 5 or 7, And a communication method between the channel controller controlled by the control circuit unit and the components connected to the channel controller is a UART system. The method of claim 1, The relay system is a distributed wireless relay system in the premises by digital signal processing, characterized in that the dual-band relay method for retransmitting high-frequency signals of two different communication systems. The method of claim 1, The transmission line connecting the main unit and the expansion unit, the main unit and the remote unit, the expansion unit and the remote unit is any one of a wired transmission line group consisting of a UTP cable, a high frequency coaxial cable, an optical line, a wire telephone line, and a CATV public hearing network. In-house wireless distributed relay system using digital signal processing, characterized in that the.

Images