KR20160080040A - Apparatus for receiving a signal in the cells with multiple overlapping signals and method thereof - Google Patents

Apparatus for receiving a signal in the cells with multiple overlapping signals and method thereof Download PDF

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Publication number
KR20160080040A
KR20160080040A KR1020150044543A KR20150044543A KR20160080040A KR 20160080040 A KR20160080040 A KR 20160080040A KR 1020150044543 A KR1020150044543 A KR 1020150044543A KR 20150044543 A KR20150044543 A KR 20150044543A KR 20160080040 A KR20160080040 A KR 20160080040A
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KR
South Korea
Prior art keywords
frequency shift
frequency
value
signal
shift value
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KR1020150044543A
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Korean (ko)
Inventor
김준우
문장원
박윤옥
방영조
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한국전자통신연구원
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Publication of KR20160080040A publication Critical patent/KR20160080040A/en

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    • 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
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • 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
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation

Abstract

An embodiment of the present invention relates to a signal reception apparatus in a cell having multiple overlapping signals and a method thereof, wherein the signal receptions apparatus comprises: a frequency shift unit for performing a frequency shift for a reception signal received through an antenna; a demodulating unit for performing demodulation on the frequency-shifted reception signal and measuring a signal interference and noise ratio (hereinafter, referred to as SINR); a decoding unit for performing decoding and cyclic redundancy check (CRC) on the reception signal on which demodulation is performed; and a frequency shift adjusting unit for measuring a frequency shift value of the reception signal by using results of the SINR and the CRC. If multiple beam signals are overlapped in a wireless transmission/reception process, interruption between data subcarriers of the overlapped beam signals can be effectively removed or avoided.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and method for receiving signals in a cell having multiple overlapping signals,

The present invention relates to a signal receiving apparatus and method in a cell having multiple superposition signals, and more particularly, to a signal receiving apparatus and a method thereof in a cell in which multiple beam signals are superimposed, in order to reduce an average interference between each beam signal, To a technique for receiving different frequency transitions when they are applied.

With the recent development of the telecommunication industry and the increasing demand of users for packet services, there is a growing need for a communication system capable of efficiently providing packet services. The existing communication network has a disadvantage that the data transmission bandwidth is relatively small and the fee for use is high because it is mainly developed for voice service. As a representative example of a broadband packet transmission scheme for solving the above disadvantages, studies on an Orthogonal Frequency Division Multiplexing (OFDM) scheme are rapidly proceeding.

This OFDM scheme is a typical multi-carrier transmission scheme in which a plurality of orthogonal subcarriers are superposed, and a symbol sequence input in series is parallel-converted and modulated by a plurality of mutually orthogonal subcarriers Transmission. This OFDM scheme is known to be able to provide an efficient platform for high-speed data transmission by taking advantage of robustness against multipath fading.

Normally, it is common to arrange the adjacent cells so that the frequency resources do not overlap with each other. However, the concept of the miniaturization of the cells and the three-dimensional beamforming are introduced, and the environment where the frequency resources of adjacent cells are inevitably overlapped each other is increasing. In particular, 3D beamforming causes many interferences between beams because several beams are steered and serviced within one base station.

Polarized antennas have vertical polarization components and horizontal polarization components that are independent of each other in an ideal environment, but cross-polarization discrimination (XPD) occurs. In order to reduce the influence, A method is proposed in which the subcarrier spacing is shorter than the subcarrier spacing. Such frequency domain transitions can be used not only in a polarized antenna system but also in a system in which a plurality of signal components overlap in the same space, such as three-dimensional beam forming.

However, in a polarized antenna, a vertical polarization component and a horizontal polarization component of a receiver can be classified by a relatively simple method using XPD. However, in a cell in which a plurality of beam signals are superimposed, There is a problem that it is difficult.

Patent Publication No. KR 2011-0044453

In an embodiment of the present invention, a cell having a plurality of superposition signals capable of measuring a frequency transition value of a received signal through a signal-to-interference and noise ratio (SINR) measurement and a cyclic redundancy check (CRC) And a method thereof.

The technical problems of the present invention are not limited to the above-mentioned technical problems, and other technical problems which are not mentioned can be understood by those skilled in the art from the following description.

A receiving apparatus in a cell having a plurality of superposition signals according to an embodiment of the present invention includes: a frequency transient unit for performing a frequency transition on a received signal received through an antenna; A demodulator for demodulating the frequency-shifted received signal and measuring a signal-to-interference-and-noise ratio (SINR); A decoding unit for decoding the demodulated received signal and performing a CRC (Cyclic Redundancy Check); And a frequency shift value adjuster for determining a frequency shift value of the received signal using the SINR and the CRC result value.

The frequency shift value controller may determine that the frequency shift value when the SINR and the CRC values are both the maximum value is the frequency shift value of the current received signal.

The frequency shift value adjusting unit may output a frequency shift value control signal for adjusting the frequency shift value to the frequency shift unit.

The receiving apparatus can sequentially grasp the frequency transition value of the received signal.

According to another aspect of the present invention, there is provided a receiving apparatus in a cell having a plurality of superimposed signals, comprising: a plurality of frequency shifters connected in parallel to perform a frequency shift of a received signal received through an antenna; A plurality of demodulation units respectively connected to the output terminals of the plurality of frequency transitions and demodulating the frequency-shifted received signal and measuring SINR; A plurality of decoders connected respectively to the output terminals of the plurality of convolution units for performing decoding on the signals output from the plurality of demodulation units and performing CRC; A result processing unit for selecting one of a plurality of output signals output from the plurality of decoding units or combining the output signals; And a frequency shift value control unit for outputting a frequency shift value control signal for adjusting a frequency shift value of the plurality of frequency shift units and a result control signal for controlling the result processing unit.

The frequency shift value controller may determine the frequency shift value using the SINR and the CRC result.

The frequency shift value controller may determine that the frequency shift value when the SINR and the CRC result are both the maximum value is the frequency shift value of the current received signal.

The result processor may select one of the output signals of the plurality of decoders or may combine output signals of the plurality of decoders according to a result control signal output from the frequency shift value controller.

The receiving apparatus can grasp the plurality of frequency shift values in parallel.

A receiving method in a cell having a multiple superposition signal according to an embodiment of the present invention includes receiving a signal through an antenna; Performing a demodulation on the received signal and measuring a signal-to-interference-and-noise ratio (SINR); Performing decoding on the demodulated received signal and performing a CRC (Cyclic Redundancy Check); And determining a frequency transition value of the received signal using the SINR and the CRC result value.

The step of determining the frequency transition value may determine that the frequency shift value when the SINR and the CRC value are both the maximum value is the frequency shift value of the current received signal.

The present technique can more efficiently perform interference cancellation or avoidance between data subcarriers of a superimposed beam signal when a plurality of beam signals are superimposed upon wireless transmission / reception.

1 is an overall configuration diagram of a three-dimensional beam forming system according to an embodiment of the present invention.
2 is a diagram illustrating a frequency domain value of a multicarrier signal to which a frequency transition is applied to a subcarrier according to an embodiment of the present invention.
3 is a configuration diagram of a transmitting apparatus for transmitting a multicarrier signal in which a frequency transition is applied to a subcarrier according to an embodiment of the present invention.
4 is a block diagram of a receiving apparatus for receiving a multi-carrier signal in which a frequency shift is applied to a subcarrier according to an embodiment of the present invention.
5 is a configuration diagram of a receiver for receiving a multi-carrier signal in which a plurality of frequency shifts are applied to subcarriers according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. Also, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

In order to facilitate communication in a situation in which a plurality of base stations and terminals cause interference of the same frequency resource in the same communal area, subcarriers of an Orthogonal Frequency Division Multiplexing (OFDM) signal are divided into subcarrier intervals ), And receives a multi-carrier signal in the case where different frequency shifts are applied to each of a plurality of beam signals.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 5. FIG.

 1 is an overall configuration diagram of a three-dimensional beam forming system according to an embodiment of the present invention.

The 3D beamforming system according to the embodiment of the present invention includes an antenna array 101, a 3D beam spot 102, and a user terminal 103 for 3D beamforming.

As shown in FIG. 1, interference occurs between various base stations and user terminals 103 in the same frequency domain with the same frequency resources. In order to minimize such interference, the subcarriers of the OFDM signal are shifted in the frequency domain by a short interval shorter than the subcarrier interval? F.

In FIG. 2, an example is shown in which the two beam signals are shifted by 1/2 of the subcarrier spacing from each other in the frequency domain.

If the subcarriers are shifted in the frequency domain of the two different beam signals, even if interference occurs between the two signals, the subcarriers of the interference signal do not completely overlap with other signals, so that it is easier to remove the interference signal.

When receiving the frequency-shifted subcarrier signal, the receiving apparatus needs to know how the subcarriers of the beam to be serviced are shifted in phase in the frequency domain.

FIG. 3 shows a transmission apparatus for transmitting a transmission signal by performing a frequency transition. FIG. 4 and FIG. 5 disclose a reception apparatus for receiving and receiving a transition value of a frequency-shifted reception signal.

3 is a block diagram of a transmitting apparatus for transmitting a multicarrier signal in which a frequency transition is applied to a subcarrier according to an embodiment of the present invention.

A transmitting apparatus for transmitting a multicarrier signal to which a frequency shift is applied to a subcarrier according to an embodiment of the present invention includes a coding unit 301, a modulating unit 302, a frequency shifting unit 303, an antenna 304, (305).

The encoding unit 301 encodes a signal to be transmitted.

The modulator 302 modulates the encoded transmission signal.

The frequency shifter 303 frequency-shifts the transmission signal in the frequency domain by the frequency shift value output from the frequency shift value adjuster 305.

The antenna 304 transmits the frequency-shifted transmission signal to the outside.

The frequency shift value adjusting unit 305 adjusts the frequency shift value. At this time, the frequency transition value can be varied if necessary.

4 is a block diagram of a receiving apparatus for receiving a multi-carrier signal in which a frequency shift is applied to a subcarrier according to an embodiment of the present invention.

A multicarrier signal receiving apparatus to which a frequency shift is applied to a subcarrier according to an embodiment of the present invention includes an antenna 401, a frequency transition unit 402, a demodulation unit 403, a decoding unit 404, a frequency shift value control unit 405 .

The antenna 401 receives a signal transmitted from an external transmitting apparatus.

The frequency transition unit 402 applies a possible frequency transition value to the received signal received by the antenna 401 and transitions it. At this time, the possible frequency transition value is adjusted by the frequency shift value control signal outputted from the frequency shift value adjusting unit 405.

The demodulation unit 403 demodulates the frequency-shifted received signal in the frequency shift unit 402 and measures the SINR (Signal and Interference and Noise Ratio) to transmit the measured SNIR to the frequency shift value controller 405 ).

The decoding unit 404 decodes the received signal demodulated by the demodulation unit 403 and performs a CRC (Cyclic Redundancy Check).

The frequency shift value adjuster 405 adjusts the frequency shift value using the measurement SINR received from the demodulator 403 and the CRC result received from the decoder 404. That is, the frequency shift value controller 405 determines that the frequency shift value having the highest value of the measured SINR and the CRC is the frequency shift value of the received beam signal.

As described above, the receiving apparatus of the present invention grasps the frequency transition value of the currently received beam signal through the SINR (Signal and Interference and Noise Ratio) measurement and the CRC (Cyclic Redundancy Check) of the received signal.

4, the receiving apparatus is configured to sequentially receive signals in a single configuration. However, in order to find a frequency shift value in parallel by receiving a plurality of subcarriers having different frequency transitions in parallel, Can be implemented.

5 is a configuration diagram of a receiver for receiving a multi-carrier signal in which a plurality of frequency shifts are applied to subcarriers according to another embodiment of the present invention.

5, a receiving apparatus for receiving a multi-carrier signal to which a plurality of frequency shifts are applied to subcarriers according to an embodiment of the present invention includes an antenna 501, a frequency shift group 502, a demodulation group 503, 504, a frequency shift value adjusting unit 505, and a result processing unit 506.

The frequency shift unit 502 includes N frequency shift units 502a, 502b, ..., and 502n connected in parallel to perform a frequency shift on a received signal received through the antenna 501. [

The demodulation section 503 includes N demodulation sections 503a, 503b, ..., and 503n connected in parallel and demodulates the received signals that are frequency shifted from the N frequency transitions 502a, 502b, ..., And measures the SINR.

The decoding unit 504 includes N decoders 504a, 504b, ..., and 504n connected in parallel to decode the demodulated signals received by the N demodulators 503a, 503b, ..., and 503n, respectively Perform CRC.

The frequency shift value adjusting unit 505 adjusts the frequency shift value using the N SINRs received from the demodulating unit 503 and the N CRC check values received from the decoding unit 504 and supplies the N decoders 504a , 504b, ..., and 504n, and outputs the selected coupling control signal SC_Ctrl to the result processing unit 506. [

The result processor 506 selects one of the decoded received signals output from the N decoders 504a, 504b, ..., 504n using the selective coupling control signal SC_Ctrl received from the frequency shift value controller 505, And outputs them.

When the transmission apparatus shown in FIG. 3 and the user terminal having the receiving apparatus as shown in FIG. 4 or 5 know the frequency transition value of the downlink beam in the same manner, the same frequency shift value is applied to the uplink, Signal can be transmitted.

Also, in the case of a terminal receiving CoMP (Cooperative Multi-Point) service by multiple base stations, it is possible to receive and demodulate a plurality of beams to which different frequency transitions are applied by the method shown in FIG.

As described above, according to the present invention, subcarriers of an OFDM signal are transited by a short interval shorter than a subcarrier interval in a frequency domain, and a receiving device grasps and receives a frequency transition value of a received signal, thereby minimizing interference between beam signals have.

That is, when multiple beam signals are superimposed on each other in the wireless transmission / reception, interference cancellation and avoidance can be more efficiently performed between the overlapped beam signal subcarriers.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (11)

A frequency shift unit for performing a frequency shift on a received signal received via an antenna;
A demodulator for demodulating the frequency-shifted received signal and measuring a signal-to-interference-and-noise ratio (SINR);
A decoding unit for decoding the demodulated received signal and performing a CRC (Cyclic Redundancy Check); And
A frequency shift value control unit for determining a frequency shift value of the received signal using the SINR and the CRC result value,
And a plurality of superposition signals. The method according to claim 1,
Wherein the frequency shift value adjusting unit comprises:
And determines that the frequency transition value when the SINR and the CRC value are both the maximum value is the frequency transition value of the current received signal. The method according to claim 1,
Wherein the frequency shift value adjusting unit comprises:
And outputting a frequency shift value control signal for adjusting the frequency shift value to the frequency shift unit. The method according to claim 1,
And sequentially grasping the frequency transition value of the received signal. A plurality of frequency transitions connected in parallel to perform a frequency transition of a received signal received through an antenna;
A plurality of demodulation units respectively connected to the output terminals of the plurality of frequency transitions and demodulating the frequency-shifted received signal and measuring SINR;
A plurality of decoders connected respectively to the output terminals of the plurality of convolution units for performing decoding on the signals output from the plurality of demodulation units and performing CRC;
A result processing unit for selecting one of a plurality of output signals output from the plurality of decoding units or combining the output signals; And
A frequency shift value control unit for outputting a frequency shift value control signal for adjusting the frequency shift value of the plurality of frequency shift units and a result control signal for controlling the result processing unit,
Wherein the signal is received by the cell. The method of claim 5,
Wherein the frequency shift value adjusting unit comprises:
And the frequency shift value is determined using the SINR and the CRC result value. The method of claim 6,
Wherein the frequency shift value adjusting unit comprises:
And determines that the frequency shift value when the SINR and the CRC result value are both the maximum value is the frequency shift value of the current received signal. The method of claim 6,
The result processing unit,
Wherein the control unit selects one of the output signals of the plurality of decoders or combines the output signals of the plurality of decoders according to a resultant control signal output from the frequency shift value controller. Receiving device. The method of claim 6,
Wherein the plurality of frequency shift values are grasped in parallel. Receiving a signal through an antenna;
Performing a demodulation on the received signal and measuring a signal-to-interference-and-noise ratio (SINR);
Performing decoding on the demodulated received signal and performing a CRC (Cyclic Redundancy Check); And
Determining a frequency transition value of the received signal using the SINR and the CRC result value
/ RTI > The method of claim 1, further comprising: The method of claim 10,
The step of determining the frequency transition value includes:
And determines that the frequency shift value when both the SINR and the CRC value are the maximum value is the frequency shift value of the current received signal.

KR1020150044543A 2014-12-29 2015-03-30 Apparatus for receiving a signal in the cells with multiple overlapping signals and method thereof KR20160080040A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200127828A (en) * 2019-05-03 2020-11-11 한국전자통신연구원 Method and apparatus for cancelling interference performed in communication system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110044453A (en) 2009-10-23 2011-04-29 한국전자통신연구원 Polarization division multiplexed optical orthogonal frequency division multiplexing transmitter and receiver

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110044453A (en) 2009-10-23 2011-04-29 한국전자통신연구원 Polarization division multiplexed optical orthogonal frequency division multiplexing transmitter and receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200127828A (en) * 2019-05-03 2020-11-11 한국전자통신연구원 Method and apparatus for cancelling interference performed in communication system

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