KR20160082095A - Device for detecting mobile telecommunication signal and service bandwidth - Google Patents

Device for detecting mobile telecommunication signal and service bandwidth Download PDF

Info

Publication number
KR20160082095A
KR20160082095A KR1020140194372A KR20140194372A KR20160082095A KR 20160082095 A KR20160082095 A KR 20160082095A KR 1020140194372 A KR1020140194372 A KR 1020140194372A KR 20140194372 A KR20140194372 A KR 20140194372A KR 20160082095 A KR20160082095 A KR 20160082095A
Authority
KR
South Korea
Prior art keywords
frequency
signal
service
mobile communication
unit
Prior art date
Application number
KR1020140194372A
Other languages
Korean (ko)
Inventor
김형호
김권
신현수
Original Assignee
주식회사 쏠리드
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 쏠리드 filed Critical 주식회사 쏠리드
Priority to KR1020140194372A priority Critical patent/KR20160082095A/en
Priority to PCT/KR2014/013104 priority patent/WO2016108313A1/en
Publication of KR20160082095A publication Critical patent/KR20160082095A/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
    • H04J11/0089—Search hardware arrangements, e.g. sharing of correlators to reduce complexity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2211/00—Orthogonal indexing scheme relating to orthogonal multiplex systems
    • H04J2211/003—Orthogonal indexing scheme relating to orthogonal multiplex systems within particular systems or standards
    • H04J2211/005—Long term evolution [LTE]

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Provided is a device for detecting a mobile communications signal and a service bandwidth. The device includes a frequency shifting part which successively shifts the frequency of an inputted mobile communications signal with a predetermined frequency interval; a correlation part which performs correlation calculation between the mobile communications signal of which the frequency is shifted by the frequency shifting part and a reference pattern corresponding to a synchronization signal included in a target mobile communications signal to be detected; and a determination part which determines whether the target communications signal exists, based on a correlation result through the correlation part. So, the mobile communications signal and a server frequency band can be easily detected.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a mobile communication signal and a service frequency band detecting apparatus,

The present invention relates to an apparatus for detecting a mobile communication signal and a service frequency band, and more particularly, to a mobile communication service and a service frequency band detecting apparatus for detecting a changed mobile communication signal and a service frequency band thereof, Communication signal and service frequency band detecting apparatus.

As the recent LTE (Long Term Evolution) service increases, the service frequency band according to the existing 3G communication method (CDMA, GSM, WCDMA, etc.) may be changed to the LTE service.

This LTE mobile communication service is a communication service based on OFDM (Orthogonal Frequency Division Multiplexing), and is implemented in accordance with a communication method different from existing 3G communication. The frequency band to be used is also a service frequency band As shown in FIG. Therefore, when the existing 3G communication service is changed to the LTE service, system change that reflects characteristics of LTE service in various signal processing aspects such as center frequency setting, filter bandwidth, gain control, amplifier control, CFR, Is requested.

If the LTE service is provided as the system setting applied to the existing 3G communication service without changing the system as described above, deterioration and distortion of the corresponding service signal may occur and normal communication service may not be provided.

Accordingly, when the existing 3G communication service is changed to the LTE service, a method is required to confirm whether the system itself is changed or not and the frequency band of the used LTE service or the like.

An aspect of the present invention is to provide a mobile communication signal and a service frequency band detection apparatus capable of easily detecting a mobile communication signal and a service frequency band thereof when a mobile communication service is changed to another service.

According to an aspect of the present invention, there is provided a mobile communication system including: a frequency shifting unit that sequentially shifts a frequency of an input mobile communication signal by a predetermined frequency interval; A correlation unit for performing a correlation operation between a mobile communication signal frequency-shifted by the frequency shifting unit and a reference pattern corresponding to a synchronization signal included in a target mobile communication signal to be detected; And a determination unit determining whether or not the target mobile communication signal exists based on a result of correlation calculation through the correlation unit.

In one embodiment, the frequency shifting unit multiplies the reference mobile frequency corresponding to the predetermined frequency interval by an integer multiple, so that the mobile communication signal is shifted in one direction by the predetermined frequency interval every predetermined period .

In one embodiment, the frequency shifting portion comprises:

A mixer for mixing the input mobile communication signal with a variable frequency signal; And a variable frequency oscillation unit that generates the variable frequency signal having a variable frequency and outputs the variable frequency signal to the mixer so that the frequency of the input mobile communication signal can be sequentially shifted by the predetermined frequency interval every predetermined period have.

In one embodiment, a filter unit is disposed at a rear end of the frequency shifting unit and at a front end of the correlating unit on the basis of the signal transmission path, and extracts a signal of a predetermined frequency bandwidth from the mobile communication signal output through the frequency shifting unit .

In one embodiment, the correlation unit may perform a correlation operation between a signal corresponding to the frequency bandwidth set in the filter unit and a reference pattern corresponding to a synchronization signal included in the target mobile communication signal, and output a correlation result.

In one embodiment, the filter unit may be implemented as a narrow-band pass filter that passes a signal of a frequency bandwidth corresponding to a synchronization signal to be included in the target mobile communication signal according to a mobile communication service protocol.

In one embodiment, the target mobile communication signal is an LTE (Long Term Evolution) service signal, and the synchronization signal may be a Primary Synchronization Signal (PSS) included in an LTE service signal.

In one embodiment, the reference pattern corresponding to the synchronization signal may be a Zadoff-Chu sequence pattern, and may further include a signal pattern generator for generating the Zadoff-Chu sequence pattern.

In one embodiment, the apparatus further includes a comparator for comparing the correlation output power outputted according to the correlation operation of the correlation unit and a predetermined threshold power,

The determining unit may determine that the target mobile communication signal exists in the input mobile communication signal when the correlation output power is equal to or greater than the threshold power as a result of the comparison unit.

In one embodiment, the mobile communication terminal further includes a band detection unit that detects a service frequency bandwidth of the target mobile communication signal based on a frequency band detection result according to frequency scanning for each predetermined frequency interval or a correlation output power output through the comparison unit can do.

In one embodiment,

The service frequency band of the target mobile communication signal can be detected based on the service frequency bandwidth of the target mobile communication signal detected by the band detector and the frequency shift size of the target mobile communication signal.

In one embodiment,

It is possible to determine the number of PSSs based on the comparison result by the comparison unit and to detect a service frequency band used by the LTE service based on the number of PSSs and the service frequency bandwidth detected by the band detection unit.

In one embodiment,

And detecting a presence or absence of the PSS on the basis of the comparison result by the comparing unit and detecting a frequency band in which the PSS is located in the LTE service signal based on a frequency shift magnitude of the frequency shifting unit when the PSS is detected, And detects the center frequency of the LTE service signal based on the frequency band in which the PSS is located.

In one embodiment,

The service frequency band used by the LTE service can be detected based on the center frequency of the detected LTE service signal and the frequency bandwidth detected by the band detecting unit.

According to the embodiment of the present invention, when the existing service is changed to another service, the changed mobile communication signal and its service frequency band can be easily detected.

In addition, according to the embodiment of the present invention, in the process of changing the service of the conventional 3G communication service (CDMA, GSM, WCDMA, etc.) to the LTE service, It is possible to maintain stable mobile communication service without deterioration of service while maintaining existing system.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating a topology of a distributed antenna system according to one embodiment of the present invention. FIG.
2 is a block diagram of an embodiment of a remote unit in a distributed antenna system to which the present invention may be applied;
3 is a block diagram illustrating a signal detection and service frequency band determination apparatus for mobile communication according to an embodiment of the present invention.
4 shows a location and band of a PSS in a time-frequency relationship of an LTE service signal;

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of known related arts will be omitted when it is determined that the gist of the present invention may be unnecessarily obscured. In addition, numerals (e.g., first, second, etc.) used in the description of the present invention are merely an identifier for distinguishing one component from another.

Also, in this specification, when an element is referred to as being "connected" or "connected" with another element, the element may be directly connected or directly connected to the other element, It should be understood that, unless an opposite description is present, it may be connected or connected via another element in the middle.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, a specific node unit (a head end unit, a hub unit, a remote unit, etc.) in a distributed antenna system will be described as an application to which the mobile communication signal and the service frequency band detection apparatus according to the embodiment of the present invention can be applied . However, the embodiments of the present invention can also be applied to other node-specific distributed units such as a base station distributed system, etc. in addition to a distributed antenna system in the same or similar manner in a specific node unit (e.g., a head end and a remote radio head (RRH) Applicable. When the mobile communication signal and the service frequency band detecting apparatus according to the embodiment of the present invention are mounted on the head end side, the system change according to the detected information (i.e., the setting of the center frequency, the filter bandwidth, the gain control, CFR, etc.) that require the system change to reflect the characteristics of the LTE service to the lower-level node unit. Therefore, in this case, the implementation of the mobile communication signal and the service frequency band detecting apparatus according to the embodiment of the present invention may be omitted for the node unit at the lower end thereof. Also, the mobile communication signal and service frequency band detecting apparatus according to the embodiment of the present invention can be applied to a digital RF repeater or an analog RF repeater.

FIG. 1 is a diagram illustrating an example of a topology of a distributed antenna system as one embodiment of a signal distribution transmission system to which the present invention can be applied.

1, a distributed antenna system (DAS) includes a base station interface unit (BIU) 10, a main unit (MU) 20, (Hub Unit) 30, which is an extension node, and a plurality of RUs (Remote Unit) 40, which are arranged at remote service locations. Such a distributed antenna system may be implemented as an analog DAS or a digital DAS, and in some cases may be implemented as a mixed type (i.e., some nodes perform analog processing and the remaining nodes perform digital processing).

1 shows an example of a topology of a distributed antenna system, and a distributed antenna system may be used in an installation area and an application field (for example, an in-building, a subway, a hospital, Stadiums, etc.), various topology modifications are possible. In this case, the number of BIU 10, MU 20, HUB 30, RU 40, and the connection relationship of the upper and lower ends of the BIU 10, the HUB 30, and the RU 40 may differ from those of FIG. Also, in the distributed antenna system, the HUB 20 is utilized when the number of branches to be branched from the MU 20 to the STAR structure is limited, compared to the number of RUs 40 required for installation. Therefore, the HUB 20 may be omitted when the number of the RUs 40 required to be installed can be sufficiently satisfied even with a single MU 20, or when a plurality of MUs 20 are installed.

Hereinafter, with reference to the topology of FIG. 1, each node in the distributed antenna system applicable to the present invention and its function will be described in turn.

A Base Station Interface Unit (BIU) 10 serves as an interface between a Base Station Transceiver System (BTS) such as a base station and an MU 20 in a distributed antenna system. In FIG. 1, a plurality of BTSs are connected to a single BIU 10, but the BIU 10 may be separately provided for each service provider, for each frequency band, and for each sector.

Generally, since the RF signal transmitted from the BTS is a high power signal, the BIU 10 generally transmits a RF signal of a high power level to the MU 20 And transfers it to the MU 20. 1, the BIU 10 receives a signal of a mobile communication service for each frequency band (or for each service provider, sector) as shown in FIG. 1, combines the signals, ), As shown in FIG.

If the BIU 10 lowers the high power signal of the BTS to a low power and then combines the mobile communication service signals and transmits them to the MU 20, the MU 20 combines the received mobile communication service signals Relay signal ") for each branch. In this case, when the distributed antenna system is implemented as a digital DAS, the BIU 10 includes a unit that performs a function of converting a high-power RF signal of the BTS into a low-power RF signal, and a unit that performs an IF (Intermediate Frequency) And converted into a unit for performing a digital signal process and combines them. Alternatively, if the BIU 10 only performs a function of lowering the high power signal of the BTS to low power, the MU 20 may combine the transmitted relay signals and distribute the relay signals for each branch.

As described above, the combined relay signal distributed from the MU 20 is transmitted to the RU 40 via the HUB 20 with respect to each branch (see Branch # 1, ... Branch #k, ... Branch #N in FIG. 1) And each RU 40 separates the combined combined relay signals by frequency bands and performs signal processing (analog signal processing in the case of analog DAS and digital signal processing in the case of digital DAS). Accordingly, each RU 40 transmits a relay signal to a user terminal in its service coverage through a service antenna. The specific functional configuration of the RU 40 will be described later in detail with reference to FIG.

1, a case where an RF cable is connected between the BTS and the BIU 10 and a case where the BIU 10 and the MU 20 are connected by the RF cable, and all the connections from the MU 20 to the lower end are connected by the optical cable, The signal transport medium between each node can also be modified in various ways. For example, the BIU 10 and the MU 20 may be connected through an RF cable, but may be connected through an optical cable or a digital interface. As another example, an optical cable is connected between the MU 20 and the HUB 30 and an RU 40 directly connected to the MU 20, and an RF cable, a twisted cable, a UTP Cable, or the like. As another example, in another example, the RU 40 directly connected to the MU 20 may also be implemented in such a manner that they are connected via an RF cable, a twisted cable, a UTP cable, or the like.

However, the following description will be made with reference to Fig. Therefore, in this embodiment, the MU 20, the HUB 30, and the RU 40 may include optical transceiver modules for all-optical conversion / photoelectric conversion, and when interconnecting nodes with a single optical cable, Wavelength Division Multiplexing (WDM) devices. This can be clearly understood from the functional description of the RU 40 in FIG. 2, which will be described later.

The distributed antenna system can be connected to an external management apparatus (NMS (Network Management Server or System) in FIG. 1 via the network.) Accordingly, the manager can remotely monitor the status and problem of each node of the distributed antenna system through the NMS And can control the operation of each node remotely.

2 is a block diagram of an embodiment of a remote unit in a distributed antenna system to which the present invention may be applied.

Here, the block diagram of FIG. 2 illustrates one implementation of an RU 40 within a digital DAS in which the inter-node connection is via an optical cable. The block diagram of FIG. 2 shows only the components related to the function of providing the service signal to the terminal in the service area through the forward path and processing the terminal signal received from the terminal in the service area through the reverse path.

Here, the node unit to which the mobile communication signal and the service frequency band detecting apparatus according to the embodiment of the present invention can be applied may be various other than the remote unit to be described later, such as the RRH in the headend, the HUB, Come on. Hereinafter, a remote unit in the distributed antenna system will be assumed for convenience and concentration of explanation.

Referring to FIG. 2, the RU 40 includes an optical to electrical converter 50, a serializer (SERDES) 50, and a serial-to-serial converter A deserializer 44, a deframer 52, a digital signal processor (DSP) 70, a digital / analog converter (DAC) 54, an up converter 56, (Amplification Unit) 58.

Thus, in the forward path, the optical relaying signal digitally transmitted through the optical cable is converted into an electric signal (serial digital signal) by the optical / electrical converter 50, and the serial digital signal is converted by the SERDES 44 into parallel digital And the parallel digital signal is reformatted by the de-framer 52 so that the digital signal processor 70 can process the frequency band. The digital signal processing unit 70 performs functions such as digital signal processing, digital filtering, gain control, and digital multiplexing for each frequency band with respect to the relay signal. The digital signal passed through the digital signal processing unit 70 is converted into an analog signal via the digital / analog converter 54 constituting the final stage of the digital part 84 based on the signal transmission path. At this time, the analog signal is an IF signal, and is up-converted to an analog signal of the original RF band through the up-converter 56. In this way, the analog signal converted into the original RF band (i.e., the RF signal) is transmitted through the PAU 58 and transmitted through the service antenna (not shown).

The RU 40 includes a Low Noise Amplifier (LNA) 68, a down converter 66, an analog-to-digital converter (ADC) 68, A digital signal processor (DSP) 70, a framer 62, a SERDES 44, and an electrical to optical converter 60. The digital signal processor (DSP)

Thus, in the reverse path, the RF signal (i.e., the terminal signal) received via the service antenna (not shown) from the user terminal (not shown) in the service coverage is low noise amplified by the LNA 68, 66, and the converted IF signal is converted into a digital signal by the analog-to-digital converter 64 and transmitted to the digital signal processing unit 70. [ The digital signal passed through the digital signal processing unit 70 is formatted into a format suitable for digital transmission through the framer 62 and converted into a serial digital signal by the SERDES 44, And is transmitted to the upper end through the optical cable.

Although not clearly shown in FIG. 2, when the RUs 40 are cascade-connected to each other as in the example of FIG. 1, when a relay signal transmitted from an upper end is transmitted to a neighboring RU of a cascaded lower end The following method can be used. For example, when an optical relay signal digitally transmitted from an upper stage is transmitted to a neighboring RU of a lower stage cascaded, the optical relay signal digitally transmitted from the upper stage is transmitted to the optical / electrical converter 50 -> SERDES 44 - The descrambler 52, the framer 62, the SERDES 44, and the photodetector 60 in that order. This can be clearly understood from FIG. 4, which will be described later.

2, the SERDES 44, the de-framer 52, the framer 62, and the digital signal processor 70 may be implemented by FPGA (Field Programmable Gate Array). Also, although the SERDES 44 and the digital signal processor (DSP) 70 are shown as shared in the downlink and uplink signal propagation paths in FIG. 2, they may be separately provided for each path. 2, a separate optical transceiver module (e.g., a single SFP (Small Form Factor Pluggable) (also referred to as a " SFP " 2, reference numeral 82)).

In the foregoing, one configuration topology and one configuration of the RU of the distributed antenna system have been described with reference to FIG. 1 and FIG. In particular, FIG. 2 illustrates the RU in a digital DAS that is digitally transmitted through a transmission medium. However, the apparatus for detecting a mobile communication signal and a service frequency band according to an embodiment of the present invention is applicable to an analog transmission system such as an analog DAS (i.e., a distributed antenna system that is analog-transmitted through a transmission medium) in addition to a digital DAS.

3 is a block diagram illustrating a signal detection and service frequency band determination apparatus for mobile communication according to an embodiment of the present invention.

3, a mobile communication signal and a service frequency band detection apparatus according to an exemplary embodiment of the present invention includes a frequency shifting unit 110, a filter unit 130, a correlating unit 150, a signal pattern generating unit 160 ), And a determination unit 170.

The frequency shifting unit 110 may sequentially shift the frequency of the input mobile communication signal (see (A) of FIG. 3) by a predetermined frequency interval. Also, at this time, the sequential movement by the predetermined frequency interval may be performed every predetermined period.

To this end, the frequency shifted tingbu 110 each set the frequency of the inputted mobile communication signal prior period to be moved in one direction by as much as the predetermined frequency interval, a reference movement frequency corresponding to said pre-set frequency interval (f s) Can be sequentially increased by an integral multiple. For example, it is twice the Move by the inputted mobile communication signal and the reference movement frequency (f s) output, and after the next cycle, the movement of the input mobile communication signal, the reference frequency frequency shifted tingbu 110 (2f s ) and then output it.

3, the frequency shifting unit 110 includes a variable frequency oscillation unit 111 for generating a variable frequency variable frequency signal, a variable frequency signal generated from the variable frequency oscillation unit 111, And a mixer 113 for mixing the input mobile communication signal. At this time, the variable frequency oscillator 111 may generate a variable frequency signal for sequentially shifting the frequency of the input mobile communication signal in one direction by the predetermined frequency interval every predetermined period. According to the embodiment of FIG. 3, the variable frequency oscillator 111 may be implemented as a numerically controlled oscillator (NCO).

The filter unit 130 extracts only a signal having a specific frequency bandwidth from the signal output from the frequency shifting unit 110. 3, the filter unit 130 is disposed at a rear end of the frequency shifting unit 110 and at a front end of the correlating unit 150 with respect to the signal transmission path, Only the signal of the bandwidth is extracted.

However, in the embodiment of the present invention, the filter unit 130 may be omitted. The filter unit 130 is provided to further enhance the correlation efficiency through the correlation unit 150. Even if the filter unit 130 is omitted, according to the correlation result by the correlation unit 150, the target mobile communication signal Since the synchronizing signal of the first frame can be detected. 3, in order to increase the efficiency of the correlation calculation through the correlator 150, the filter unit 130 may filter the target mobile communication signal to be detected, Bandwidth narrow band pass filter (narrow band BPF).

As will be described later, when the mobile communication signal to be detected is an LTE service signal, there are a PSS (Primary Synchronization Signal) and an SSS (Secondary Synchronization Signal) as shown in FIG. 4 as a synchronization signal in the LTE service signal. Here, FIG. 4 is a diagram illustrating a location and a band of a PSS in a time-frequency relationship of an LTE service signal. Referring to FIG. 4, as a synchronization signal in the LTE service signal, PSS and SSS are repeated every 5 ms period. In addition, the PSS and SSS have a bandwidth of 1.08 MHz.

Therefore, according to the embodiment of the present invention, when a method of detecting PSS as a synchronization signal to detect an LTE service signal, which is a target mobile communication signal, is employed, the narrow band pass filter has a bandwidth of 1.08 MHz And may be set to have a corresponding bandwidth. In this case, a signal transmitted through the filter unit 130 and transmitted to the correlator 150 is a signal corresponding to a passband of the narrowband pass filter and a bandwidth corresponding to the bandwidth of the mobile communication signal frequency- Band signal.

The correlation unit 150 performs a correlation operation between the signal extracted from the filter unit 130 and a reference pattern corresponding to a synchronization signal included in a target mobile communication signal to be detected. If there is no synchronization signal in the signal of the band extracted by the filter unit 130, a very low correlation value is outputted as the correlation result according to the correlation operation in the correlation unit 150. [ On the contrary, when the synchronization signal exists in the signal of the band extracted by the filter unit 130, a correlation value having a very high value will be outputted as a result of the correlation operation performed by the correlation unit 150.

The reference pattern to be used for the correlation operation of the correlation unit 150 may be generated by the signal pattern generation unit 160 and transmitted to the correlation unit 150. [ The signal pattern generation unit 160 generates a reference pattern corresponding to a synchronization signal of a target mobile communication signal to be detected. However, if the target mobile communication signal to be detected is fixed, the signal pattern generator 160 may be omitted. This is because the reference pattern may be stored in the correlation unit 150 itself and used.

In one embodiment, when the target mobile communication signal to be detected is an LTE service signal as described above, the signal pattern generator 160 may generate a reference pattern corresponding to the pattern of the PSS signal. Here, since the PSS signal includes the Zadoff-Chu sequence, according to the embodiment of FIG. 3, the signal pattern generator 160 generates the Zadoff-Chu sequence as a reference pattern.

The determination unit 170 detects whether there is a target mobile communication signal to be detected and a service frequency band based on a correlation calculation result of the correlation unit 150. [ For this, the determination unit 170 may include a comparison unit 171, a band detection unit 173, and a frequency band determination unit 175 as shown in FIG. Hereinafter, each component will be described in detail.

The comparator 171 compares the correlation output power outputted in accordance with the correlation operation of the correlator 150 with a preset threshold power. The threshold power may be set in consideration of the output power that is output according to the correlation operation between the synchronization signal and the reference pattern by including the synchronization signal in the mobile communication signal input to the correlation unit 150. [ That is, the threshold power is set so that the presence or absence of the target mobile communication signal to be detected can be confirmed when the correlation output power is equal to or greater than the threshold power.

Accordingly, the determination unit 170 can determine whether or not there is a target mobile communication signal to be detected in the input mobile communication signal, based on the comparison result of the comparison unit 171. [ For example, if the target mobile communication signal to be detected is an LTE service signal, the determination unit 170 may determine that the mobile communication communication is an LTE service based on the comparison result of the comparison unit 171, It is possible to detect that an LTE service signal exists in the signal.

If the comparison result of the comparison unit 171 indicates that the correlation output power equal to or greater than the threshold power is present a plurality of times with different time differences, the target mobile communication signals are served in a plurality of different frequency bands . For example, in the case of an LTE service signal, since there is only one PSS signal per service, the presence of a plurality of correlation output powers equal to or greater than the threshold power means that a plurality of LTE services are provided with different frequency bands. Accordingly, the determination unit 170 can detect the number of LTE services included in the inputted mobile communication signal by checking the number of PSSs according to the comparison result of the comparison unit 171. [

In addition, the determination unit 170 can confirm the service frequency bandwidth used by the detected target mobile communication signal. This can be detected by the band detection unit 173 in the determination unit 170. [ The detection of the service frequency bandwidth of the target mobile communication signal can be performed by the following method. For example, the band detecting unit 170 may detect a correlation output power based on a correlation output power according to a correlation calculation result of the correlating unit 150, and continuously output a signal frequency range And detects (discriminates) the service frequency bandwidth of the target mobile communication signal. Alternatively, the band detecting unit 170 may detect the service frequency bandwidth of the target mobile communication signal through a separate frequency scanning process regardless of the correlation output power according to the correlation calculation result of the correlation unit 150 described above. For example, it is possible to detect a frequency range in which the power of the input signal is maintained at a predetermined value or more by performing frequency scanning by a preset frequency bandwidth interval (ex. 200 KHz), thereby detecting the service frequency bandwidth of the target mobile communication signal have. If the number of detected PSSs is two and the total service frequency bandwidth detected by the band detecting unit 173 is 20 MHz, it is also possible to discriminate that two LTE services of a 10 MHz service frequency bandwidth are provided.

When the service frequency bandwidth of the target mobile communication signal is detected as described above, the determination unit 170 (more specifically, the frequency band determination unit 175) determines the service of the target mobile communication signal The frequency band can also be determined. Hereinafter, a method of discriminating the service frequency band of the target mobile communication signal will be described. Hereinafter, for convenience of explanation, the case of an LTE service signal will be described.

According to an embodiment, the determination unit 170 may inversely refer to the frequency shift amount by the frequency shifting unit 110 when the PSS signal is detected according to the comparison result of the comparison unit 171, The signal can detect the original frequency band actually located in the LTE service signal. When the original frequency band in which the PSS signal is actually located is identified, the center frequency of the corresponding LTE service signal can also be checked based on this. This is because the center frequency exists at a position spaced by a certain frequency interval in the frequency band of PSS. When the center frequency of the LTE service signal is confirmed, the service frequency band of the LTE service can be detected by considering the service frequency bandwidth of the LTE service detected by the band detecting unit 173 together.

In another embodiment, the determination unit 170 may determine that the service frequency bandwidth of the target mobile communication signal detected by the band detection unit 173, the frequency shift size of the frequency shifting unit 110, It is also possible to detect the service frequency band of the target mobile communication signal by inverse-calculating the frequency band with reference to the passband by the mobile station.

As described above, according to the mobile communication signal and the service frequency band detecting apparatus according to the embodiment of the present invention, the input signal is frequency-shifted while performing a correlation calculation on the synchronous signal included in the mobile communication signal, The existence of the signal and the service frequency band can be easily grasped. Therefore, according to the mobile communication signal and service frequency band detecting apparatus according to the embodiment of the present invention, even when a service change such as an existing 3G communication service is changed to an LTE service, Changing the frequency band of the service, setting the required center frequency, filter bandwidth, gain control, amplifier control, CFR setting, etc.) can be performed by itself. Accordingly, even when the existing 3G communication service is changed to the LTE service, a stable mobile communication service without deterioration of service is possible through system change while maintaining the existing system as it is.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims And changes may be made without departing from the spirit and scope of the invention.

110: Frequency shifting portion
111: Frequency variable oscillation unit
113: Mixer
130:
150:
160: Signal pattern generator
170:
171:
173:
175: Frequency band determining unit

Claims (14)

A frequency shifting unit that sequentially shifts the frequency of the input mobile communication signal by a predetermined frequency interval;
A correlation unit for performing a correlation operation between a mobile communication signal frequency-shifted by the frequency shifting unit and a reference pattern corresponding to a synchronization signal included in a target mobile communication signal to be detected; And
A determination unit for determining whether or not the target mobile communication signal is present based on a correlation calculation result through the correlation unit;
And a mobile communication signal and a service frequency band detection device.
The method according to claim 1,
Wherein the frequency shifting unit increases the reference mobile frequency corresponding to the predetermined frequency interval by an integer multiple so that the mobile communication signal is shifted in one direction by the predetermined frequency interval every predetermined period, And a service frequency band detection device.
3. The method of claim 2,
The frequency shifting unit includes:
A mixer for mixing the input mobile communication signal with a variable frequency signal; And a variable frequency oscillation unit for generating the variable frequency signal having a variable frequency and outputting the variable frequency signal to the mixer so that the frequency of the input mobile communication signal can be sequentially shifted by the predetermined frequency interval every predetermined period, Mobile communication signal and service frequency band detection apparatus.
The method according to claim 1,
Further comprising a filter unit disposed at a rear end of the frequency shifting unit and at a front end of the correlating unit with respect to a signal transmission path and extracting a signal of a predetermined frequency bandwidth among mobile communication signals output through the frequency shifting unit, Signal and service frequency band detection device.
5. The method of claim 4,
Wherein the correlation unit performs a correlation operation between a signal corresponding to the frequency bandwidth set in the filter unit and a reference pattern corresponding to a synchronization signal included in the target mobile communication signal to output a correlation result, Device.
5. The method of claim 4,
Wherein the filter unit is implemented as a narrow band pass filter that passes a signal of a frequency bandwidth corresponding to a synchronization signal to be included in the target mobile communication signal according to a mobile communication service protocol.
5. The method of claim 4,
Wherein the target mobile communication signal is a LTE (Long Term Evolution) service signal and the synchronization signal is a Primary Synchronization Signal (PSS) included in an LTE service signal.
8. The method of claim 7,
The reference pattern corresponding to the synchronization signal is a Zadoff-Chu sequence pattern,
And a signal pattern generator for generating the Zadoff-Chu sequence pattern.
8. The method of claim 7,
Further comprising a comparator for comparing the correlation output power outputted according to the correlation operation of the correlator with a predetermined threshold power,
Wherein the determination unit determines that the target mobile communication signal exists in the input mobile communication signal when the correlation output power is equal to or greater than the threshold power as a result of the comparison unit.
10. The method of claim 9,
Further comprising a band detection unit for detecting a service frequency bandwidth of the target mobile communication signal based on a frequency band detection result obtained by frequency scanning for each predetermined frequency interval or a correlation output power outputted through the comparison unit, And a service frequency band detection device.
11. The method of claim 10,
Wherein,
A mobile communication signal and a service frequency band for detecting a service frequency band of the target mobile communication signal based on a service frequency bandwidth of the target mobile communication signal detected by the band detecting unit and a frequency shift size by the frequency shifting unit, Detection device.
11. The method of claim 10,
Wherein,
And a mobile station for detecting a service frequency band used by the LTE service based on the number of the PSSs and the service frequency bandwidth detected by the band detecting unit based on a comparison result by the comparison unit, Signal and service frequency band detection device.
11. The method of claim 10,
Wherein,
And detecting a presence or absence of the PSS on the basis of the comparison result by the comparing unit and detecting a frequency band in which the PSS is located in the LTE service signal based on a frequency shift magnitude of the frequency shifting unit when the PSS is detected, And detects a center frequency of an LTE service signal based on a frequency band in which the PSS is located.
14. The method of claim 13,
Wherein,
And detects a service frequency band used by the LTE service based on the center frequency of the detected LTE service signal and the frequency bandwidth detected by the band detection unit.
KR1020140194372A 2014-12-30 2014-12-30 Device for detecting mobile telecommunication signal and service bandwidth KR20160082095A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020140194372A KR20160082095A (en) 2014-12-30 2014-12-30 Device for detecting mobile telecommunication signal and service bandwidth
PCT/KR2014/013104 WO2016108313A1 (en) 2014-12-30 2014-12-31 Device for detecting mobile communication signal and service frequency band

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020140194372A KR20160082095A (en) 2014-12-30 2014-12-30 Device for detecting mobile telecommunication signal and service bandwidth

Publications (1)

Publication Number Publication Date
KR20160082095A true KR20160082095A (en) 2016-07-08

Family

ID=56284465

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020140194372A KR20160082095A (en) 2014-12-30 2014-12-30 Device for detecting mobile telecommunication signal and service bandwidth

Country Status (2)

Country Link
KR (1) KR20160082095A (en)
WO (1) WO2016108313A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200005473A (en) * 2018-07-05 2020-01-15 주식회사 쏠리드 Repeater and operating method of the repeater

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018056696A1 (en) * 2016-09-20 2018-03-29 엘지전자(주) Method for transmitting/receiving data in wireless communication system and device therefor

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9088348B2 (en) * 2007-06-18 2015-07-21 Digi International Inc. System and method for obtaining frequency and time synchronization in a wideband communication system
US8401123B2 (en) * 2009-07-28 2013-03-19 Broadcom Corporation Method and system for increasing the accuracy of frequency offset estimation in multiple frequency hypothesis testing in an E-UTRA/LTE UE receiver
US8380151B2 (en) * 2009-12-18 2013-02-19 Broadcom Corporation Method and system for reducing the complexity of multi-frequency hypothesis testing using an iterative approach
US8447005B2 (en) * 2009-11-05 2013-05-21 Telefonaktiebolaget L M Ericsson (Publ) Frequency synchronization methods and apparatus
KR102053764B1 (en) * 2012-08-01 2019-12-09 한국전자통신연구원 Apparatus and method for detecting code

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200005473A (en) * 2018-07-05 2020-01-15 주식회사 쏠리드 Repeater and operating method of the repeater
US11240087B2 (en) 2018-07-05 2022-02-01 Solid, Inc. Repeater and method of operation thereof

Also Published As

Publication number Publication date
WO2016108313A1 (en) 2016-07-07

Similar Documents

Publication Publication Date Title
US10681664B2 (en) Node unit capable of measuring and compensating transmission delay and distributed antenna system including the same
US9490890B2 (en) Base station signal matching device for distributed antenna system
EP3396911B1 (en) Main unit and distributed antenna system comprising same
US20180027431A1 (en) Node unit of distributed antenna system
US10341159B2 (en) Head-end device and method of recovering synchronization detection error using the same
US10716011B2 (en) Downlink digital signal summation in distributed antenna system
US9948379B2 (en) Base station signal matching device
US9584386B2 (en) Node unit capable of measuring delay and distributed antenna system including the same
KR20160082095A (en) Device for detecting mobile telecommunication signal and service bandwidth
KR20160126610A (en) Distributed antenna system and remote apparatus thereof
KR102287210B1 (en) Node unit of distributed antenna system
KR102250111B1 (en) Headend for distributed antenna system and operating method thereof
KR101836387B1 (en) Digital transmission overflow processing device
KR101877269B1 (en) Device for controlling gain of each band of mobile telecommnication signal
KR101836388B1 (en) Digital output overflow processing device
KR100998582B1 (en) Systen of passive optical network for local customer networking and communication method thereof
KR20170060221A (en) Small Cell-Based Communication System
KR20160080437A (en) Node unit in distributed antenna system

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E601 Decision to refuse application