JP2006186997A - Premises wireless distributed relay system using digital signal processing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a premises wireless distributed relay system using a digital signal processing that can improve communication quality and retransmit quality signals. <P>SOLUTION: The premises radio distributed relay system using a digital signal processing improves communication quality and retransmits a good quality signal, by eliminating undesired interference signals contained in high-frequency signals by a digital signal processing part, after converting the high frequency signal received from a base station or a communications system through a wired or wireless connection into a digital signal and connecting a plurality of expansion units with a remote unit through an inexpensive communication line. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a signal processing device for a wireless communication system, and after converting a high frequency signal received from a base station or a communication system to a digital signal by wired or wireless connection, an unnecessary signal included in the high frequency signal by a digital signal processing unit. The present invention relates to a local wireless distributed relay system based on digital signal processing that can improve communication quality by relieving interference signals and retransmit high-quality signals.

  A conventional relay device that receives a high-frequency signal from a base station and retransmits it to a shaded area is not intended by other base stations or terminals other than the signal of the base station to be retransmitted via a receiving antenna. Since many unnecessary signals are mixed or signals transmitted to the transmitting antenna are fed back, there is a problem in that communication quality is greatly deteriorated by such multiple interference signals.

  FIG. 1 is a diagram illustrating a signal transmission / reception state of a relay device in a base station environment where the relay device is provided, and a shaded area occurs in an existing service area (a portion indicated by a dotted line) of the first base station BTS1. Then, it is a figure which shows the case where a signal is retransmitted by the relay apparatus 100. FIG. In general, a cell-type mobile communication system is operated in such a manner that a large number of base stations covering a predetermined area are provided adjacent to each other and an allocated channel frequency is reused. That is, as shown in FIG. 1, the second base station BTS2 and the third base station BTS3 having respective service areas are adjacent to each other around the first base station. A large number of such base stations are arranged to construct a communication network.

In FIG. 1, when the signal of the first base station is retransmitted to the shaded area using the relay device, the signal of the first base station to be retransmitted is basically sent to the receiving antenna 101 of the relay device. The signal f _B1 is received and the signal f _B1R retransmitted by the transmission antenna 102 is transmitted, but in an actual propagation environment, the signals f _B2 and f of other base stations are sent to the reception antenna 101. Together with _B3 ,..., The signal f _B1R retransmitted to the transmitting antenna 102 is fed back and received.

  Therefore, as described above, the relay apparatus according to the related art, in addition to the signal of the base station to be retransmitted via the receiving antenna, many unnecessary signals that are not intended from other base stations or terminals. Or the signal transmitted to the transmitting antenna is fed back, and there is a problem that the communication quality is greatly deteriorated by such multiple interference signals. That is, as shown in FIG. 1, in addition to the signal to be retransmitted (displayed with a solid line), many unnecessary signals (displayed with a dotted line) are mixed.

  The present invention was made to solve the above-described problems of the prior art, and an object of the present invention is to convert a high-frequency signal received from a base station or a communication system to a digital signal by wired or wireless connection. After that, unnecessary interference signals included in the high-frequency signal are removed by the digital signal processing unit, and a large number of extension units and remote units are connected by an inexpensive communication line, thereby improving communication quality and generating high-quality signals. It is an object of the present invention to provide a local wireless distributed relay system using digital signal processing that can be retransmitted.

  In order to achieve the above object, a local wireless distributed relay system by digital signal processing according to the present invention is a device for processing and retransmitting a signal received from a base station or a communication system by wired or wireless connection, A high-frequency signal received from a base station or a communication system is down-converted to an intermediate frequency, a digital signal converted by an A / D converter is converted into a baseband digital signal, and then included in the high-frequency signal by a digital signal processing unit. The main unit 301 to which the extension unit or the remote unit is connected to the output end thereof is connected to the main unit, the baseband digital signal is transmitted, and the remote unit is connected to the output end thereof. At least one or more expansion units 303, 303-1, 303 to be connected 2, 303-3, connected to the expansion unit, converts the baseband digital signal to a digital signal, upconverts the analog signal converted by the D / A converter to an intermediate frequency, and then converts it to a high frequency signal And at least one remote unit 304, 304-1, 304-2 to be retransmitted, transmission for connecting the main unit and the extension unit, the main unit and the remote unit, and the extension unit and the remote unit. And a line 306.

  The main unit includes a link antenna 302 for transmitting and receiving high-frequency signals to and from different communication systems or base stations, and a diplexer 401 that is connected to the link antenna and passes two frequency bands of different communication systems or base stations. And the first and second duplexers 402 and 402-1 for passing the two frequency bands output from the diplexer and coupling the transmission / reception paths, respectively, and the reception paths of the first and second duplexers, respectively. The first and second down-converters 403 and 403-1 that are connected and down-convert a high-frequency signal to an intermediate frequency, and convert the analog intermediate-frequency signal output from the first and second down-converters into a digital signal. First and second A / D converters 404 and 404-1, and the first An unnecessary signal removing unit 405 that receives a digital signal from the second A / D converter and removes an unnecessary signal; and a framer 406 that reconfigures an output signal of the unnecessary signal removing unit into a form suitable for transmission; The output signals of the framer are distributed to a maximum of eight, from the first to nth serializers / deserializers 407, 407-1, 407-2, and the first to nth serializers / deserializers, respectively, for serializing them. First to nth transceivers 408, 408-1, 408-2, 408-3, 408-4, 408-5 for transmitting and receiving digital signals of two frequency bands that are branched and output, respectively , First to nth output connectors 409, 409-1, 409-2, 409-3, 409-4, 4 connected to the first to nth transceivers and coupled to the transmission line. 9-5, and first to nth deframers 410, 410-1, 410-2 for restoring reverse digital signals output from the first to nth serializers / deserializers by a control signal from the outside, A channel controller 411 for applying a control signal to the first to nth deframers, a control circuit unit 412 for applying a control signal to the channel controller, and an output signal of the first to nth deframers as one An adder 413 coupled to the path, and first and second D / A converters 415 and 415-1 that respectively convert two frequency band digital signals branched and output from the adder into analog signals. First and second up-converters 416 that receive analog signals from the first and second D / A converters and up-convert to high-frequency signals, respectively. 416-1.

  The extension unit includes first and second input connectors 501 and 501-1 coupled to any one of the first to n-th output connectors of the main unit by a transmission line, and the first and second inputs. Each connected to a connector, connected to the first and second input transceivers 502 and 502-1 for respectively transmitting and receiving digital signals of two frequency bands, and to the first and second input transceivers; An input serializer / deserializer 503 that serializes the frame, a framer 506 that reconfigures the output signal of the input serializer / deserializer into a form suitable for transmission, and the output signals of the framer are divided into a maximum of eight. The first to nth serializers / deserializers 507, 507-1, and 507-2 to be serialized, and the first to nth serializers. / First to n-th transmitter / receivers 508, 508-1, 508-2, 508-3, 508-4, 508 for transmitting / receiving digital signals of two frequency bands branched and output from the deserializer -5 and first to nth output connectors 509, 509-1, 509-2, 509-3, 509-4, 509 connected to the first to nth transceivers and coupled to the transmission line, respectively. -5, and first to n-th deframers 510, 510-1, 510-2 for restoring the reverse digital signal output from the first to n-th serializer / deserializer by an external control signal, A channel controller 511 for applying a control signal to the first to nth deframers and an output signal of the first to nth deframers are combined in one path, and the input serializer is connected. / Comprises an adder 513 to send to the deserializer, the.

  The remote unit is externally connected to first and second input connectors 601 and 601-1 that are coupled to any one of the first to n-th output connectors of the main unit or the extension unit by a transmission line, A first input and a second input for transmitting and receiving digital signals of two frequency bands respectively connected to the third input connector 601-2 to which power is applied and the first and second input connectors. An input serializer / deserializer 603 that is connected to the transceivers 602 and 602-1 and the first and second input transceivers and serializes them, and that the output signal of the input serializer / deserializer is suitable for transmission. A framer / deframer 604 for reconfiguring or restoring a reverse digital signal by an external control signal; A control circuit unit 612 that applies a control signal to the beamer, and first and second D / A converters 605 that respectively convert two frequency band digital signals output from the framer / deframer into analog signals, 605-1, first and second upconverters 606, 606-1 that receive analog signals from the first and second D / A converters and upconvert to high frequency signals, respectively, The first and second duplexers 607 and 607-1 that pass the high-frequency signal output from the second up-converter, respectively, and the transmission and reception paths, and two frequency bands of different communication systems or base stations. A diplexer 608 for combining the signals of the first and second duplexers, and different communications connected to the diplexer. A remote antenna 609 for servicing two frequencies of a system or a base station to a shaded area, and high-frequency signals of two frequencies of different communication systems or base stations that have passed through the first and second duplexers, respectively. First and second down converters 610 and 610-1 that respectively down-convert to an intermediate frequency, and analog intermediate frequency signals of the first and second down converters are converted into digital signals, respectively, and sent to the framer / deframer A / D converters 611 and 611-1, a clock unit 614 for extracting clock data from the input serializer / deserializer and generating a synchronization clock, and a power supply from the third input connector are applied appropriately. And a power supply unit 613 for converting the voltage into a proper voltage.

  The present invention converts a high-frequency signal received from a base station or a communication system by wired or wireless connection into a digital signal, and then removes an unnecessary interference signal included in the high-frequency signal by a digital signal processing unit, thereby reducing the cost of communication. By connecting a large number of extension units and remote units via lines, it is possible to improve communication quality and retransmit high-quality signals. In addition, the operator can easily operate the network in consideration of the propagation environment in the shadow area, and can be widely applied to various relay systems only by changing the software by digital signal processing. In addition, since unnecessary signals can be removed in the base band using digital signal processing technology, a wider band can be achieved.

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

  FIG. 2 is a diagram illustrating a local radio relay system in which a relay device according to the related art is installed, and FIG. 3 is a diagram illustrating a local radio distributed relay system using digital signal processing according to the present invention. First, in the relay apparatus according to the related art as shown in FIG. 2, only one relay apparatus is used independently in a shaded area to be serviced, or like a large building 200 in which the shaded area is adjacent. When there are a large number of small shaded areas, a large number of sub-relay devices 203, 203-1, 203-2, and 203-3 are added to one main relay device 201.

  However, since the above-described method connects the main relay device and the sub relay device using the coaxial line 207 and the signal distribution unit 206, the cost increases. Further, since the signal transmitted from the main relay device to the sub-relay device is a high-frequency signal or an analog signal converted into an intermediate frequency, not only the transmission loss increases but also the sub-devices that can be added. The number of relay devices is also limited, and in particular, unnecessary signals such as interference are not removed, so that there is a problem that call quality deteriorates. Further, when the large building is high-rise and has a large area, there is another problem that the sub-relay device cannot service the entire layer.

  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 wired connection by the digital signal processing unit. One main unit 301 to which an extension unit or a remote unit is connected to the output end thereof, and at least one extension unit 303, 303- connected to the main unit and to which the remote unit is connected to the output end thereof 1, 303-2, 303-3, and at least one remote unit 304, 304-1, 304-2 that is connected to the extension unit and retransmits a high-frequency signal to the corresponding shaded area. Main unit and extension unit, Main unit and remote unit, Extension Knit and said remote unit is configured to be connected by the transmission line 306 of the low cost.

  FIG. 4 is a connection diagram of a local wireless distributed relay system using digital signal processing according to the present invention. As described above, a maximum of eight expansion units or remote units are connected to the main unit 301 by the transmission line 306. (Refer to reference symbol A in FIG. 4), and up to eight remote units are connected to the extension units 303, 303-1, and 303-2 (see reference symbol B in FIG. 4). The extension units 303, 303-1, and 303-2 are provided with connectors so that two bands can be relayed (see reference numeral C in FIG. 4). In the same manner, the remote units 304, 304-1 and 304-2 are also provided with connectors so as to relay two bands, and the remote units 304, 304-1 and 304-2 are A power connector is further provided so that power can be supplied from the main unit or the expansion unit without using a separate power source (see reference symbol D in FIG. 4).

  FIG. 5 is a block diagram illustrating a main unit of a local wireless distributed relay system using digital signal processing according to the present invention, and includes a link antenna 302 for transmitting and receiving high-frequency signals to and from different communication systems or base stations. A diplexer 401 that is connected to an antenna and passes two frequency bands of different communication systems or base stations, and two frequency bands that are output from the diplexer are passed, and a transmission / reception path is combined. First and second duplexers 402, 402-1 and first and second down converters 403, 403- connected to the reception paths of the first and second duplexers, respectively, for down-converting a high-frequency signal to an intermediate frequency 1 and the analog output from the first and second down converters The first and second A / D converters 404 and 404-1, which convert the intermediate frequency signal into a digital signal, receive the digital signal from the first and second A / D converters, and remove unnecessary signals. The unnecessary signal removing unit 405, the framer 406 for reconfiguring the output signal of the unnecessary signal removing unit into a form suitable for transmission, and the output signals of the framer are distributed into a maximum of eight, each of which is serialized. The first to nth serializers / deserializers 407, 407-1, 407-2 and the two frequency bands branched and output from the first to nth serializer / deserializer First to nth transceivers 408, 408-1, 408-2, 408-3, 408-4, 408-5 for transmitting and receiving digital signals, respectively, and the first to nth transceivers. First to nth output connectors 409, 409-1, 409-2, 409-3, 409-4, 409-5, each connected to a transmission line and coupled to a transmission line, and the first to nth serializers / The first to nth deframers 410, 410-1, 410-2 for restoring the reverse digital signal output from the deserializer by an external control signal, and the first to nth deframers are controlled. A channel controller 411 for applying a signal, a control circuit unit 412 for applying a control signal to the channel controller, an adder 413 for combining output signals of the first to n-th deframers into one path, and First and second D / A converters 415 and 415-1 that respectively convert digital signals of two frequency bands that are branched and output from the adder into analog signals; The first and second up-converters 416 and 416-1 which receive analog signals from the first and second D / A converters and up-convert them into high-frequency signals, respectively.

  The link antenna 302 has a dual band or wideband function so that two frequency bands can be transmitted and received. The diplexer 401 is connected to the link antenna and has two frequencies of different communication systems or base stations. Let the band pass. The two frequency bands output from the diplexer are respectively passed by the first and second duplexers 402 and 402-1 and the transmission / reception paths are combined, and the reception paths of the first and second duplexers are combined. Are connected to the first and second down converters 403 and 403-1 and the first and second A / D converters 404 and 404-1, respectively, and the two high-frequency signals are down-converted to an intermediate frequency. Then, it is further converted into a digital signal.

  The unnecessary signal removal unit 405 receives digital signals from the first and second A / D converters, removes unnecessary signals by digital signal processing described later in FIG. 8, and is suitable for transmission via the framer 406. The output signals of the framer are distributed to a maximum of eight, and serialized by the first to nth serializers / deserializers 407, 407-1, and 407-2, respectively. Subsequently, the digital signals of the two frequency bands that are branched and output from the first to nth serializers / deserializers are converted into first to nth transceivers 408, 408-1, 408-2, 408-. 3, 408-4, 408-5, and first to nth output connectors 409, 409-1, 409-2, 409-3, 409-4, 409- corresponding to these and coupled to the transmission line, respectively. 5 performs transmission / reception with an extension unit or a remote unit, which will be described later.

  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 transceiver 408-. 5 are configured to be paired, and the first transmitter / receiver 408, the third transmitter / receiver 408-2, and the n-1 transmitter / receiver 408-4 are for a low frequency band (for example, PCS in Korea). The second transceiver 408-1, the fourth transceiver 408-3, and the nth transceiver 408-5 are for high frequency bands (eg, IMT-2000) or vice versa. Can be That is, two transceivers connected to one serializer / deserializer are for different frequency bands, and the main unit can be connected to up to eight pairs of these transceivers.

  On the other hand, in the case of reverse signals input to the first to n-th output connectors 409, 409-1, 409-2, 409-3, 409-4, and 409-5, n transceivers 408, 408-1, 408-2, 408-3, 408-4, 408-5 transmit digital signals of two frequency bands to the first to nth serializer / deserializer, The reverse digital signal receives a control signal from the outside, and the first to nth deframers 410, 410-1, and 410-2 perform operations opposite to the framer 406, thereby restoring the signal form. Is done.

  The output signals of the first to nth deframers 410, 410-1, and 410-2 are added by an adder 413, and are divided into two frequency band digital signals and transmitted to the digital filter 414 as described above. Is done. The digital filter 414 can improve out-of-band signal suppression by filtering with the bandwidth of each communication method (1.23 MHz for CDMA, 5 MHz for WCDMA, etc.), and signal purity. In addition, the efficiency of the high-power amplifier can be increased, and an FIR (Finite Impulse Response) method, an IIR (Infinite Impulse Response) method, or the like can be used.

  A control signal is applied from the control circuit unit 412 to the first to nth deframers 410, 410-1, and 410-2 via the channel controller 411. In the embodiment of the present invention, the output signal of the deframer is synchronized by communication of a universal asynchronous receiver transmitter (UART), and is combined into one path by an adder 413. The function to control. Since the synchronization function performed by the control circuit unit 412 is obvious to those skilled in the art, illustration and description thereof are omitted in the detailed description of the present invention.

  The digital signals in 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, and then the first and second digital signals are converted. Analog signals are received from the D / A converters of the first and second high-frequency signals through the first and second up-converters 416 and 416-1. Here, according to an embodiment of the present invention, the output of the first up-converter 416 is in a low frequency band (e.g., a PCS in South Korea) and is input to the first duplexer 402, and the second up-converter 416. The output of −1 is a high frequency band (for example, IMT-2000), and is input to the second duplexer 402-1.

  FIG. 6 is a block diagram showing an extension unit of the local wireless distributed relay system using 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 present invention are the first and second output connectors 409 and 409-1 and the third and fourth outputs of the main unit through transmission lines. It is connected to any one of eight pairs such as connectors 409-2, 409-3, n-1 and n-th output connectors 409-4, 409-5. When connected in this way, the frame is reconfigured into a form suitable for transmission by the framer 506 connected to the subsequent stage via the input serializer / deserializer 503, and the output signals of the framer are distributed to a maximum of eight. Serialization is performed by the nth serializer / deserializer 507, 507-1, and 507-2.

  The digital signals of the two frequency bands that are branched and output from the first to nth serializer / deserializer are first to nth transceivers 508, 508-1, 508-2, 508-3, 508. -4, 508-5, and first to nth output connectors 509, 509-1, 509-2, 509-3, 509-4, 509-5, which correspond to these and are coupled to the transmission line, respectively. Transmission / reception to / from the remote unit is performed. Here, the expansion unit according to the present invention excludes the first and second input connectors 501, 501-1, the first and second input transceivers 502, 502-1, and the input serializer / deserializer 503. Since other configurations and operations are the same as those of the main unit, the following description is omitted.

  FIG. 7 is a block diagram showing a remote unit of the local wireless distributed relay system using 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, 409-1, third and third of the main unit or extension unit by transmission lines. The four output connectors 409-2 and 409-3, the (n-1) th and nth output connectors 409-4 and 409-5 are connected to any one of eight pairs. When connected in this way, it is reconfigured into a form suitable for transmission by the framer / deframer 604 connected to the subsequent stage via the input serializer / deserializer 603, and two frequency bands output from the framer / deframer 604 After the digital signals are converted into analog signals by the first and second D / A converters 605 and 605-1, the analog signals are received from the first and second D / A converters. Up-converted into high-frequency signals through first and second up-converters 606 and 606-1, respectively.

  In contrast, in the case of a reverse signal, the first and second duplexers 607 and 607-1, which have passed through the first and second duplexers 607 and 607-1, respectively, are used as the first and second high-frequency signals of two different communication systems or base stations. The second down converter 610, 610-1 down-converts to an intermediate frequency, which is further converted into a digital signal by the A / D converters 611, 611-1, and is transmitted 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. It further includes a clock unit 614 that extracts clock data from the input serializer / deserializer and generates a synchronization clock, and a power source unit 613 that receives power from the third input connector and converts it to an appropriate voltage.

  FIG. 8 is a block diagram showing an unnecessary signal removal algorithm of the local wireless distributed relay system by digital signal processing according to the present invention, and its operation is as follows. The CDMA (IS-95, CDMA2000, WCDMA, etc.) signal converted from an analog signal to a digital signal by the A / D converters 404 and 404-1 in FIG. Thus, the I and Q signals converted into baseband signals are output by the first digital filter 702 only with the frequency for each carrier or the bandwidth according to a predetermined communication standard.

Further, the baseband I and Q signals are branched, and only the signals of the individual channels (in the case of CDMA, individual FA) pass through the second digital filters 705 and 705-1, respectively. , PN detector 706 and PN tracker 707 at the same time. The PN detector 706 detects a pilot or preamble signal of each signal from a multipath signal of a large number of base stations or base stations to be retransmitted, and detects the time of each pilot signal. Delay information t _d , phase information Φ, and amplitude information A are extracted. The time delay, phase and amplitude information is communicated to the PN tracker 707 to continuously track the t _d , Φ, A of each pilot that varies with time. The result tracked by the PN tracker 707 is transmitted to a PN generator 708, and the PN generator 708 generates a pseudo noise signal to be removed using the result, and the generated signal is Only the individual FA band is filtered by the baseband filter 709 and then input to the adder / subtractor 711, whereby unnecessary pseudo noise signals are removed.

That is, if the PN detector 706 detects the time delay, phase and amplitude information of the multipath signal of the base station to be retransmitted and the pilot signals of the signals received from a number of base stations or terminals, the PN tracking is performed. The device 707 continuously tracks the same type of information (t _d , Φ, A) from the pilot of the signal that changes with time based on the information, and the result is used by the PN generator 708 to remove it. By generating a PN signal to be transmitted and passing it through an adder / subtracter 711, unnecessary signals are removed, and only a signal of a desired base station is relayed.

  Further, as can be seen from FIG. 8, the PN tracker 707, the PN generator 708, and the baseband filter 709 constitute a PN removal circuit unit 700 as one aggregate. Since it is provided for each FA, unnecessary signals can be removed for each FA. The relay device according to the present invention is not limited to a device that retransmits only a single FA.

  Furthermore, the present invention has been described as using an unshielded (UTP) cable connected to an RJ45 type connector as a transmission line as shown in FIG. 4, but the present invention is not limited to this. First, various types of transmission lines through which digital signals can be transmitted, for example, high frequency coaxial cables, optical lines, wired telephone lines, and CATV networks can be used.

  Therefore, the relay device according to the present invention facilitates the operator's network operation considering the propagation environment in the shadow area, and can be applied to a wide variety of relay systems only by changing the software by digital signal processing. In addition, since unnecessary signals can be removed in the baseband using digital signal processing technology, it is possible to increase the bandwidth, and the technology that overcomes the narrowband limitations of existing analog interference cancellation systems It is. That is, the present invention is a technique for digital signal processing of the entire bandwidth and analyzing the signal for each channel. Therefore, the present invention is not limited to a specific system, and various mobile communication systems (IS95) can be obtained by software upgrade. , GSM, CDMA2000, WCDMA, etc.).

The present invention described above can be variously replaced, modified, and changed without departing from the technical idea of the present invention as long as it has ordinary knowledge in the technical field to which the present invention belongs. Therefore, the present invention is not limited to the above-described embodiment and attached drawings.

It is a figure which shows the signal transmission / reception state of a relay apparatus in the environment of the base station in which the relay apparatus was installed. It is a figure which shows the local radio relay system in which the relay apparatus based on a prior art was installed. 1 is a diagram showing a local wireless distributed relay system by digital signal processing according to the present invention. FIG. 1 is a connection diagram of a local wireless distributed relay system using digital signal processing according to the present invention. FIG. It is a block diagram which shows the main unit of the local radio | wireless distributed relay system by the digital signal processing based on this invention. It is a block diagram which shows the expansion unit of the local radio | wireless distributed relay system by the digital signal processing based on this invention. It is a block diagram which shows the remote unit of the local radio | wireless distributed relay system by the digital signal processing based on this invention. It is a block diagram which shows the unnecessary signal removal algorithm of the local radio | wireless distributed relay system by the digital signal processing based on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Relay apparatus 101 Reception antenna 102 Transmission antenna 200, 300 Large building 201 Main relay apparatus 202 1st antenna 203, 203-1, 203-2, 203-3 1st thru | or nth sub relay apparatus 204 2nd antenna
205 Terminal 206 Signal distribution means 207 Coaxial line 301 Main unit 302 Link antenna 303, 303-1, 303-2, 303-3 First to nth extension units 304, 304-1, 304-2 First to nth n remote units 304 terminal 306 transmission line 401, 608 diplexer 402, 402-1 first and second duplexer 403, 403-1 first and second down converters 404, 404-1 first and second A / D converter 405 Unnecessary signal removal unit 406, 506 Framer
407, 407-1, 407-2 1st to nth serializers / deserializers 408, 408-1, 408-2, 408-3, 408-4, 408-5 1st to nth transceivers 409, 409 -1, 409-2, 409-3, 409-4, 409-5 1st to n-th output connectors 410, 410-1, 410-2 1st to n-th deframers 411, 511 Channel controller 412, 612 Control circuit unit 413, 513 Adder 414 Digital filter 415, 415-1 First and second D / A converters 416, 416-1 First and second up-converters 501, 501-1 First and second Two input connectors 503, 603 Input serializer / deserializer 502, 502-1 First and second input transceivers 507, 507-1, 07-2 1st thru | or nth serializer / deserializer 508, 508-1, 508-2, 508-3, 508-4, 508-5 1st thru | or nth transmitter-receiver 509, 509-1, 509-2 , 509-3, 509-4, 509-5 1st to n-th output connectors 510, 510-1, 510-2 1st to n-th deframers 601, 601-1, 601-2 1st to 3rd Input connectors 602, 602-1 first and second input transceivers 604 framer / deframer 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 down converters 611, 611-1 first and second / D converter 613 Power supply unit 614 Clock unit 700 PN removal circuit unit 701, 703 First and second digital mixers 702 First digital filter 704, 710 Third and fourth digital mixers 705, 705-1 Second 706 PN detector 707 PN tracker 708 PN generator 709 Baseband filter 711 Adder / Subtracter

Claims (10)

An apparatus for processing and retransmitting signals received from a base station or communication system by wired or wireless connection,
A high-frequency signal received from the base station or communication system is down-converted to an intermediate frequency, a digital signal converted by an A / D converter is converted to a baseband digital signal, and then included in the high-frequency signal by an unnecessary signal removing unit One main unit in which an unnecessary unit is removed and an extension unit or a remote unit is connected to the output end thereof;
At least one extension unit connected to the main unit for transmitting the baseband digital signal and having a remote unit connected to an output end thereof;
Connected to the extension unit, converts the baseband digital signal to a digital signal, up-converts the analog signal converted by the D / A converter to an intermediate frequency, converts it to a high frequency signal, and retransmits at least one Two or more remote units,
A local wireless distributed relay system using digital signal processing, comprising: the main unit and the extension unit; the main unit and the remote unit; and a transmission line and a connector for connecting the extension unit and the remote unit. The main unit is a link antenna for transmitting and receiving high-frequency signals with different communication systems or base stations,
A diplexer connected to the link antenna and passing two frequency bands of different communication systems or base stations;
A first duplexer and a second duplexer that respectively pass two frequency bands output from the diplexer and combine transmission and reception paths;
First and second down converters connected to the receiving paths of the first and second duplexers, respectively, for down converting 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 down converters into digital signals;
An unnecessary signal removing unit that receives digital signals from the first and second A / D converters and removes unnecessary signals;
A framer for reconfiguring the output signal of the unnecessary signal removal unit into a form suitable for transmission;
First to nth serializers / deserializers that serially distribute the output signals of the framer to a maximum of eight,
First to nth transceivers for respectively transmitting and receiving two frequency band digital signals branched and output 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 reverse digital signals output from the first to nth serializers / deserializers by an external control signal;
A channel controller for applying a control signal to the first to nth deframers;
A control circuit unit for controlling the channel controller;
An adder for combining the output signals of the first to nth deframers into one path;
First and second D / A converters that respectively convert digital signals of two frequency bands branched and output from the adder into analog signals;
The digital signal according to claim 1, further comprising: first and second up-converters that receive analog signals from the first and second D / A converters and up-convert each into a high-frequency signal. Private wireless relay system with signal processing. The unnecessary signal removing unit is
A PN detector that receives the baseband digital signal, detects a pilot of each signal or a known signal, then extracts time delay information, phase information, and 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, the time delay information, phase information, and amplitude information of each pilot that changes with time or a previously known signal are tracked. At least one PN tracker communicating to the PN generator;
At least one PN generator for generating a pseudo-noise signal to be removed using the result received from the PN tracker;
At least one baseband filter for filtering the PN signal generated by the PN generator for each FA;
An adder / subtracter that adds / subtracts an output signal of the baseband filter to an output signal of the digital filter and removes an unnecessary signal;
3. The local radio dispersion by digital signal processing according to claim 1, wherein a PN removal circuit unit including the PN tracker, the PN generator, and the baseband filter as one aggregate is provided for each FA. Relay system.   The local wireless distributed relay system by digital signal processing according to claim 1 or 2, wherein an extension unit or a remote unit is connected to the main unit. The expansion unit is
First and second input connectors coupled to any one of the first to n-th output connectors of the main unit by a transmission line;
First and second input transceivers connected to the first and second input connectors, respectively, for transmitting and receiving digital signals of two frequency bands;
An input serializer / deserializer connected to and serializing the first and second input transceivers;
A framer for reconfiguring the output signal of the input serializer / deserializer into a form suitable for transmission;
First to nth serializers / deserializers that serially distribute the output signals of the framer to a maximum of eight,
First to nth transceivers for respectively transmitting and receiving two frequency band digital signals branched and output 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 reverse digital signals output from the first to nth serializers / deserializers by an external control signal;
A channel controller for applying a control signal to the first to nth deframers;
2. The local wireless dispersion by digital signal processing according to claim 1, further comprising: an adder that combines the output signals of the first to nth deframers into one path and sends the same to the input serializer / deserializer. Relay system.   The local wireless distributed relay system by digital signal processing according to claim 5, wherein a remote unit is connected to the extension unit. The remote unit is
A first input connector and a second input connector coupled to any one of the first to nth output connectors of the main unit or the expansion unit by a transmission line;
A third input connector connected to the outside and applied with power;
First and second input transceivers connected to the first and second input connectors, respectively, for transmitting and receiving digital signals of two frequency bands;
An input serializer / deserializer connected to and serializing the first and second input transceivers;
A framer / deframer for reconfiguring the output signal of the input serializer / deserializer into a form suitable for transmission, or restoring a reverse digital signal by an external control signal;
A control circuit unit for applying a control signal to the framer / 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 that receive analog signals from the first and second D / A converters and up-convert to high-frequency signals, respectively;
First and second diplexers for passing high-frequency signals output from the first and second up-converters, respectively, and coupling transmission and reception paths;
A diplexer 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 connected to the diplexer for serving two frequencies of different communication systems or base stations in a shaded area;
First and second down-converters that respectively down-convert high-frequency signals of two frequencies of different communication systems or base stations that have passed through the first and second duplexers, respectively, to intermediate frequencies;
An A / D converter that converts the analog intermediate frequency signals of the first and second down-converters into digital signals, respectively, and sends them to the framer / deframer;
A clock unit that extracts clock data from the input serializer / deserializer and generates a synchronization clock;
The local wireless distributed relay system by digital signal processing according to claim 1, further comprising: a power supply unit that receives power from the third input connector and converts the power into an appropriate voltage.   The communication system between the channel controller controlled by the control circuit unit and the components connected to the channel controller is a UART (Universal Asynchronous Receiver Transmitter) system. A local wireless distributed relay system using digital signal processing according to 5 or 7.   The local wireless distributed relay system using digital signal processing according to claim 1, wherein the relay system is a double-band relay system that retransmits high-frequency signals of two different communication systems.   Transmission lines connecting the main unit and the extension unit, the main unit and the remote unit, and the extension unit and the remote unit are a UTP (Unshielded Twisted Pair) cable, a high-frequency coaxial cable, an optical line, a wired telephone line, and CATV. The local wireless distributed relay system by digital signal processing according to claim 1, wherein the system is any one selected from a group of wired transmission lines made of a network.

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