KR101800760B1 - Receiver for controlling inter-cell interference in sidelink system and method for controlling interference inter-cell interference in the receiver - Google Patents

Abstract

The present invention relates to a receiver capable of suppressing and eliminating inter-cell interference in a side-link system, and a method of suppressing and eliminating inter-cell interference in the receiver, and more particularly, Rejection Combining) and SIC (Successive Interference Cancellation) to suppress and eliminate intercell interference in a side link system capable of more effectively suppressing and eliminating intercell interference in a side link system, and intercell interference And to a method for suppressing and eliminating the above problems.

Description

TECHNICAL FIELD [0001] The present invention relates to a receiver capable of suppressing and eliminating inter-cell interference in a side-link system, and a method of suppressing and eliminating inter-cell interference in a receiver thereof. BACKGROUND OF THE INVENTION 1. Field of the Invention }

The present invention relates to a receiver capable of suppressing and eliminating inter-cell interference in a side-link system, and a method of suppressing and eliminating inter-cell interference in the receiver, and more particularly, Rejection Combining) and SIC (Successive Interference Cancellation) to suppress and eliminate intercell interference in a side link system, and a method of suppressing and eliminating intercell interference in the receiver.

Recently, a number of major research institutes, including the 3rd Generation Partnership Project (3GPP) standard group, have been focusing on the placement of a number of small cells in macrocells to accommodate the growing mobile traffic. However, such a scheme has a problem in that the installation and operation cost of a small cell increases proportionally to the number of small cells to be disposed. Especially, in the environment where the maximum amount of traffic varies by region due to the increase of the floating population, the fixed small cell installation plan is inefficient in terms of installation and operation cost. In order to solve these problems, it is necessary to develop a portable small cell technology capable of being connected to a macro base station and a Gbps wireless backhaul and being movable by users.

However, since the capacity of the wireless backhaul is limited by the capacity of the wireless backhaul of the macro base station, there is a limit to increase the network capacity only by the Gbps wireless backhaul technology. For this reason, portable small-cell inter-cell side holes are required, and mobile small cells can communicate with peripheral small cells through the side holes.

The mobile small cell has a higher probability of being affected by intercell interference from the surrounding small cell. Particularly, the research for solving the interference problem in the cell boundary area terminal can be classified into the inter-cell cooperative processing technique and the transmission method for reducing the interference in the base station transmitter and the method for handling the interference in the receiver by applying the high performance reception algorithm. However, in the former case, each terminal must feed back channel information for interference processing. Considering the feedback overhead and the inaccuracy of the feedback information as the number of antennas increases, there are restrictions on the method of processing the transmitter interference that requires feedback. On the other hand, the way of handling interference at the receiver does not require feedback, and has recently received attention from 3GPP.

High-performance reception algorithms that can reduce interference effects can be classified into interference suppression receivers and interference cancellation receivers. The NAICS (Network Assisted Interference Cancellation and Suppression) research can be classified into high performance receiver algorithms and related network support methods . In the multi-cell environment, receiver algorithms based on Minimum Mean Square Error (MMSE) are actively proposed from the perspective of interference cancellation and capacity improvement. In 3GPP Release-12, NAICS is approved as SI (Study Item) Improvements, types of support information, and overheads are being discussed.

Accordingly, it is required to develop a receiver that can more effectively reduce interference from neighboring cells.

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned problems of the prior art, and in particular, it is an object of the present invention to provide an apparatus and a method for inter-cell interference in a side link system by combining IRC (Interference Rejection Combining) and SIC (Successive Interference Cancellation) And a method for suppressing and eliminating intercell interference in the receiver.

According to an aspect of the present invention, there is provided a receiver capable of suppressing and eliminating inter-cell interference in a side link system, including: a signal receiver for receiving a signal; And calculating a signal to interference ratio (SIR) of a signal received through the signal receiver, checking whether the calculated SIR value is greater than 0, and if the calculated SIR value exceeds 0, performing an interference rejection combining ) Detecting a magnetic signal through a decoding method, detecting an interference signal through a Successive Interference Cancellation (SIC) decoding method, detecting a magnetic signal through an SIC decoding method, and suppressing and eliminating intercell interference .

At this time, if the calculated SIR value is 0 or less, the signal processing unit can detect an interference signal through an IRC decoding method and then detect a magnetic signal through an SIC decoding method.

At this time, if the calculated SIR value is less than or equal to 0, the signal processing unit determines that the size of the interference signal is large, and detects the interference signal according to Equation (24) through IRC decoding.

&Quot; (24) "

는 자기신호 및 잡음의 공분산 행렬을 의미한다.here

Denotes a covariance matrix of magnetic signals and noise.

At this time, the signal processor detects the interference signal, and then detects the magnetic signal through the SIC decoding method, as shown in Equation (26).

&Quot; (26) "

은 잡음의 공분산 행렬을 의미한다. here,

Is the covariance matrix of the noise.

At this time, if the SIR value of the received signal is greater than 0, the signal processing unit determines that the magnitude of the magnetic signal is large, detects the magnetic signal through the IRC decoding method, and outputs the interference signal through the SIC decoding method. A magnetic signal can be finally detected through the SIC decoding method in order to remove the detected interference signal from the received signal.

At this time, if the SIR value of the received signal is greater than 0, the signal processing unit determines that the magnitude of the magnetic signal is large and can detect the magnetic signal through the IRC decoding method as shown in Equation (27) have.

&Quot; (27) "

은 간섭 신호 및 잡음의 공분산 행렬을 의미한다.here

Denotes a covariance matrix of interference signals and noise.

At this time, the signal processor determines that the magnitude of the magnetic signal is large, detects the magnetic signal through the IRC decoding method, and can detect the interference signal through the SIC decoding method as shown in Equation (28).

&Quot; (28) "

At this time, the signal processor may detect the interference signal through the SIC decoding method and finally detect the magnetic signal through the SIC decoding method as shown in Equation (26) to remove the detected interference signal from the reception signal .

&Quot; (26) "

은 잡음의 공분산 행렬을 의미한다. here,

Is the covariance matrix of the noise.

According to an aspect of the present invention, there is provided a method of suppressing and eliminating interference between cells in a receiver, including: receiving a signal through an antenna; Calculating a signal to interference ratio (SIR) of the received signal; Checking whether the calculated SIR value is greater than 0; Detecting a magnetic signal through an IRC (Interference Rejection Combining) decoding method when the calculated SIR value exceeds 0; And detecting a magnetic signal through a successive interference cancellation (SIC) decoding method after the detection of the magnetic signal.

Detecting a magnetic signal through an IRC decoding method when the calculated SIR value is 0 or less after performing the calculation process; Detecting an interference signal through the SIC decoding method after detecting the magnetic signal; And detecting a magnetic signal through the SIC decoding method to remove the detected interference signal from the received signal.

Further, the present invention can provide a computer readable recording medium on which a program for executing a method for suppressing and eliminating intercell interference in a receiver as described above is recorded.

According to a receiver capable of suppressing and eliminating intercell interference in the side link system of the present invention and a method of suppressing and eliminating intercell interference in the receiver, it is possible to combine IRC (Interference Rejection Combining) and SIC (Successive Interference Cancellation) The inter-cell interference in the link system can be more effectively suppressed and eliminated. When the receiver of the present invention is applied to a mobile communication system, a higher performance gain can be obtained as compared with a receiver used in a conventional mobile communication system. This has the advantage of improving the throughput finally through improving the error rate (BER, BLER, FER) performance showing the improvement of the quality of service (QoS) of the users.

In addition, if a receiver capable of suppressing and eliminating interference in a side link is successfully applied to a 5G system as in the present invention, it can be a preemptive technology in a cellular environment. In addition, Efficiency improvement, expansion of service area and reduction of network construction cost. Thus, the present invention has the advantage of bringing about an academic ripple effect and securing prior art for national research and development.

1 and 2 are block diagrams showing an internal configuration of a side link system transmitting / receiving end.
3 is a flowchart showing the flow of the received signal processing in the SIC receiver.
4 is a block diagram illustrating a main configuration of a receiver according to an embodiment of the present invention.
5 is a flowchart illustrating a method for suppressing and eliminating inter-cell interference in a side link system according to an embodiment of the present invention.
6 to 8 are diagrams illustrating performance in a receiver according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS For a more complete understanding of the nature and advantages of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings, in which:

In the following description and the accompanying drawings, detailed description of well-known functions or constructions that may obscure the subject matter of the present invention will be omitted. It should be noted that the same constituent elements are denoted by the same reference numerals as possible throughout the drawings.

The terms and words used in the following description and drawings are not to be construed in an ordinary sense or a dictionary, and the inventor can properly define his or her invention as a concept of a term to be described in the best way It should be construed as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It is to be understood that equivalents and modifications are possible.

Also, terms including ordinal numbers such as first, second, etc. are used to describe various elements, and are used only for the purpose of distinguishing one element from another, Not used. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component.

In addition, when referring to an element as being "connected" or "connected" to another element, it means that it can be connected or connected logically or physically. In other words, it is to be understood that although an element may be directly connected or connected to another element, there may be other elements in between, or indirectly connected or connected.

Also, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. It is also to be understood that the terms such as " comprising "or" having ", as used herein, are intended to specify the presence of stated features, integers, It should be understood that the foregoing does not preclude the presence or addition of other features, numbers, steps, operations, elements, parts, or combinations thereof.

In addition, embodiments within the scope of the present invention include computer-readable media having computer-executable instructions or data structures stored on computer-readable media. Such computer-readable media can be any available media that is accessible by a general purpose or special purpose computer system. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or in the form of computer- But is not limited to, a physical storage medium such as any other medium that can be used to store or communicate certain program code means of the general purpose or special purpose computer system, .

In the following description and claims, the term "network" is defined as one or more data links that enable electronic data to be transmitted between computer systems and / or modules. When the information is transmitted or provided to a computer system via a network or other (wired, wireless, or a combination of wired or wireless) communication connection, the connection may be understood as a computer-readable medium. Computer readable instructions include, for example, instructions and data that cause a general purpose computer system or special purpose computer system to perform a particular function or group of functions. The computer executable instructions may be binary, intermediate format instructions, such as, for example, assembly language, or even source code.

In addition, the invention may be practiced with other computer systems, including personal computers, laptop computers, handheld devices, multiprocessor systems, microprocessor-based or programmable consumer electronics, network PCs, minicomputers, mainframe computers, a pager, and the like. < RTI ID = 0.0 > [0040] < / RTI > The invention may also be practiced in distributed systems environments where both local and remote computer systems linked by a combination of wired data links, wireless data links, or wired and wireless data links over a network perform tasks. In a distributed system environment, program modules may be located in local and remote memory storage devices.

Now, a receiver capable of suppressing and eliminating inter-cell interference in a side link system according to an embodiment of the present invention and a method of suppressing and eliminating inter-cell interference in the receiver will be described in detail with reference to the drawings. Here, the same reference numerals are used for similar functions and functions throughout the drawings, and a duplicate description thereof will be omitted.

The main structure of the side link system transmitting / receiving end according to the general embodiment will now be described with reference to FIGS. 1 and 2. FIG. Hereinafter, the structure of the transmission / reception end of the side link system according to the general embodiment will be described based on 3GPP LTE-Advanced.

1 and 2 are block diagrams showing an internal configuration of a side link system transmitting / receiving end. First, the structure of the side link system transmitting terminal will be described with reference to FIG.

Referring to FIG. 1, a configuration of a transmission unit 100 of a side link system according to a general embodiment is shown. 1, a transmitter 100 includes scrambling units 10-1 and 10-2, modulation units 11-1 and 11-2, a layer mapping unit 12, a space time block coder 13-1, 13-2, a precoding unit 14, a reference signal generator 15, resource element mapping units 16-1 and 16-2, and signal generators 17-1 and 17-2.

The input signal is scrambled through the scrambling units 10-1 and 10-2 and then modulated through the modulators 11-1 and 11-2. The modulated input signal is mapped through the layer mapping unit 12 and then transmitted to the resource element mapping units 16-1 and 16-2 via the space time block encoders 13-1 and 13-2 and the precoding unit 14. [ 2). The resource element mapping units 16-1 and 16-2 perform a mapping operation on the input signal using the reference signal generator 15. [ Thereafter, the signal is transmitted to each antenna after passing through the signal generator 17-1.

The transmitting end of the side link system thus configured generates a transmission signal based on the SC-FDMA technique. In the SC-FDMA technique, M-point FFT processing is performed for each layer before IFFT input in the transmitter modulation process, and N-point IFFT processing is performed on the FFT output signal in the receiver demodulation process.

In addition, the minimum resource allocation unit of the side hole is a resource block (RB), and the resource block corresponds to 12 subcarriers (180 kHz) in frequency and one slot in time. One subcarrier in one SC-FDMA symbol is called a resource element (RE). In this case, one slot is composed of 7 SC-FDMA symbols, one slot has a time length of 0.5 ms, and the two slots form a 1-ms long sub-frame. Then, 10 subframes are gathered to form a 10ms radio frame.

Demodulation Reference Signal (DMRS) is used as a reference signal for using a PSSCH (Physical Side-Shared CHannel) for the side-hall data transmission and for obtaining a channel estimation value used for PSSCH data detection.

The baseband signal of the side channel physical channel at the transmitting end of the side link system configured as described above is composed of the following steps.

1. Each codeword transmitted in a physical channel is scrambled on a bit-by-bit basis after passing through the channel coding.

2. Modulate the scrambled bits to produce a complex-valued symbol.

3. Map complex-valued modulation symbols to at least one transmission layer.

4. Perform a precoding transform on the complex-valued symbol.

5. Pre-code the symbol of each layer to transmit through the antenna port.

6. Map the symbol to the resource element of each antenna port.

7. Generate a complex-valued time domain SC-FDMA signal at each antenna port.

Now, the structure of the receiving end of the side link system will be described with reference to FIG.

2 is a diagram illustrating a receiving end structure of a side link system according to a general embodiment.

2, the receiver 200 includes demodulators 22-1 and 22-2, a channel estimator 20, a receiver 21, resource element demapping units 23-1 and 23-2, The decoding unit 24, the space-time block decoders 25-1 and 25-2, the de-layer mapping unit 26, the modulation units 27-1 and 27-2, the descrambling units 28-1 and 28- 2).

At the receiving end, after the SC-FDMA demodulation, the received signal is distorted in size and phase by the channel, so channel compensation is performed through the channel estimation and equalizer using a reference signal.

In this SC-FDMA technique, M-point FFT processing is performed for each layer before IFFT input in the transmitter modulation process and N-point IFFT processing is performed on the FFT output signal in the receiver demodulation process. Thus, PAPR (Peak to Average Power Ratio.

In this way, SC-FDMA is used as a side-hall radio access technology to reduce power consumption of the terminal. Here, the subcarrier interval of the N-point FFT is 15 kHz.

In the side link system according to this general embodiment, the receiver for processing the received signal received at the receiving end may be MMSE, IRC, SIC and ML (Maximum Likelihood).

Hereinafter, general receivers MMSE, IRC, SIC and ML will be described first.

At this time, the received signal in the RE of the side link system can be expressed as Equation (1) below.

와

는 각각 단말(UE; User Equipment)가 서빙셀에서 전달하는 신호와 해당 전파 채널을 의미한다.

와

는 각각 q번째 간섭 신호와 해당 전파 채널이고, N은 잡음을 의미한다. here

Wow

Refers to a signal transmitted from a serving user equipment (UE) and a corresponding propagation channel, respectively.

Wow

Is the q-th interference signal and the corresponding propagation channel, respectively, and N is noise.

Hereinafter, a description will be given of a noise removal method in each general receiver.

First, a noise canceling method in an MMSE receiver will be described.

가 요구되며, MMSE 수신기는 하기의 <수학식 2>와 같이 나타낼 수 있다.The Minimum Mean Square Error (MMSE) is a common method for interference cancellation, where interference is considered white noise. Therefore, interference and noise power

, And the MMSE receiver can be expressed as Equation (2) below.

When the ideal channel estimation is applied, the weight matrix of the MMSE is expressed by Equation (3) below.

와

는 각각 서빙셀(q=0)에서 단말(UE)의 심볼당 전송 신호 전력과 q번째 셀의 간섭 신호 전력을 나타내고,

와

은 잡음과 간섭 전력을 의미한다. 그리고

는 q번째 셀에서 단말(UE)의 전송 스트림의 개수를 의미하고,

는 q번째 셀과 단말(UE) 사이의 이상적인 채널 행렬을 나타낸다.here,

Wow

Represents the transmission signal power per symbol and the interference signal power of the q-th cell in the serving cell (q = 0), respectively,

Wow

Refers to noise and interference power. And

Denotes the number of transport streams of the UE in the q-th cell,

Represents an ideal channel matrix between the q-th cell and the UE.

The ideal output SINR value of the MMSE is calculated by Equation (4) below.

In this case, the intra-cell interference covariance and the inter-cell interference covariance are expressed by Equation (5).

On the other hand, the IRC (Interference Rejection Combining) receiver has better performance than the MMSE receiver in the interference-strong scenario and can be expressed as Equation (6) below.

은 간섭 및 잡음 공분산 행렬(covariance matrix) 값으로, 하기 <수학식 7>을 통해 계산되며,

은 서빙 셀의 DMRS(Demodulations Reference Signal) 시퀀스를 의미한다. At this time,

Is a covariance matrix value of the interference and noise, is calculated by Equation (7) below,

Denotes a Demodulation Reference Signal (DMRS) sequence of a serving cell.

When the ideal channel estimation is applied, the weight matrix of the IRC is expressed by Equation (8) below.

The ideal output SINR value of the IRC is calculated by Equation (9) below.

In this case, the intra-cell interference covariance and the inter-cell interference covariance are expressed by Equation (10).

Next, the SIC (Successive Interference Cancellation) receiver will be described. The SIC receiver requires information about the channel matrix causing the modulation order and interference for the interfering signal. The SIC receiver can be expressed as Equation (11).

는 간섭 신호

에 대한 양자화된 추정값이다.At this time,

Lt; / RTI &gt;

Lt; / RTI &gt;

The received signal processing flow for the SIC receiver can be represented as shown in FIG.

3 is a flowchart showing the flow of the received signal processing in the SIC receiver.

Referring to FIG. 3, the SIC receiver first performs ordering and nulling on the received signal (S400, S402).

Thereafter, slicing is performed by applying a hard decision-based symbol level SIC (S404).

The SIC receiver obtains an estimated value of the interference signal and calculates a desired signal through a canceling process with the received signal (S406).

의 양자화 추정은 하기의 <수학식 12>와 같이 나타낼 수 있다. In the ideal channel estimation,

Can be expressed by Equation (12) below. &Lt; EMI ID = 12.0 >

는 q번째 셀의 간섭 신호 전력을 나타내고,

과

은 자기신호와 잡음의 전력을 말한다. 그리고

은 q번째 셀의 전송 스트림의 개수를 의미하고,

는 q번째 셀과 단말(UE) 사이의 이상적인 채널 행렬을 나타낸다. here,

Represents the interference signal power of the q-th cell,

and

Refers to the power of the magnetic signal and noise. And

Denotes the number of transport streams of the q-th cell,

Represents an ideal channel matrix between the q-th cell and the UE.

When an ideal channel estimation technique is applied, the weighting matrix of the SIC is expressed by Equation (13) below.

와 각 서빙셀(q=0)의 심볼당 전송 신호 전력을 나타내고,

은 잡음을 의미한다. here,

And the transmission signal power per symbol of each serving cell (q = 0)

Means noise.

The restored signal is expressed by Equation (14) below.

The ideal output SINR value of the SIC is calculated by Equation (15) below.

In this case, the intra-cell interference covariance and the inter-cell interference covariance are expressed by Equation (16).

이고,

는 검출 신호의 에러 확률을 의미하는 것으로, 하기의 <수학식 17>과 같다. here,

ego,

Denotes an error probability of the detection signal, and is expressed by Equation (17) below.

Finally, the ML receiver is a receiver that uses the ML technique. The ML technique has the most disadvantage, but it has the highest complexity.

The ML receiver can be expressed by Equation (18) below.

는 원하는 신호와 간섭 신호에 사용되는 변조 방식의 콘스텔레이션 포인트 셋(constellation points set)을 나타낸다.At this time,

Represents a constellation points set of a modulation scheme used for a desired signal and an interference signal.

The output SINR value of the ML is calculated by calculating the SINR of the Perfect Interference Cancellation (PIC) and the SINR of the MMSE. Here, the output SINR of the PIC is expressed by Equation (19) below.

The output SINR of the MMSE is as described in Equation (4).

The ideal output SINR of the ML using this is calculated by Equation (20) below.

와

는 하기의 <수학식 21>을 통해 계산된다. here,

Wow

Is calculated by the following equation (21).

At this time, the degree to which the capacity of the MIMO interval, that is, the channel information, is not fed back to the transmitting end can be calculated by Equation (22) below.

The capacity of MMSE, PIC, and ML can be calculated by Equation (23) below.

The general receiver has been described above.

Hereinafter, a receiver capable of suppressing and eliminating intercell interference in a side link system according to an embodiment of the present invention and a method of suppressing and eliminating intercell interference in the receiver will be described.

The receiver proposed in the present invention applies the IRC instead of the MMSE to the existing interference detection method in the SIC receiver, and it can suppress and eliminate intercell interference more efficiently by using IRC and SIC. In addition, the receiver of the present invention will be referred to as FSC (Full Suppression and Cancellation) in the detailed description and drawings in order to distinguish it from the general receiver systems MMSE, IRC, SIC and ML. The receiver FSC of the present invention is a receiver that combines the IRC receiver and the SIC receiver to suppress and eliminate inter-cell interference.

The configuration of the receiver of the present invention will be described with reference to Fig.

4 is a block diagram illustrating a main configuration of a receiver according to an embodiment of the present invention.

Referring to FIG. 4, the receiver 21 according to the embodiment of the present invention may include a signal receiving unit 21_1 and a signal processing unit 21_2.

First, the signal receiving unit 21_1 performs a role of receiving a signal.

The signal processor 21_2 performs the function of suppressing and eliminating inter-cell interference according to an embodiment of the present invention. Particularly, the signal processing unit 21_1 of the present invention calculates the SIR (Signal to Interference Ratio) of the signal received through the signal receiving unit 21_1, checks whether the calculated SIR value is larger than 0, When the SIR value exceeds 0, a magnetic signal is detected through an IRC (Interference Rejection Combining) decoding method, an interference signal is detected through a Successive Interference Cancellation (SIC) decoding method, and a magnetic signal is detected through an SIC decoding method .

Hereinafter, a method of suppressing and eliminating inter-cell interference in a receiver according to an embodiment of the present invention will be described.

FIG. 5 is a flowchart illustrating a method for suppressing and eliminating intercell interference in a side link system according to an embodiment of the present invention. FIGS. 6 to 8 illustrate performance in a receiver according to an embodiment of the present invention. to be.

Referring to FIG. 5, the receiver calculates a signal to interference ratio (SIR) of a received signal (S 500, S 502). Thereafter, it is checked whether the calculated SIR value is greater than 0 (S504). If it is determined in step S504 that the SIR value of the received signal is less than or equal to '0', that is, if the size of the interference signal is large, the interference signal is detected through the IRC (S512).

At this time, the process of detecting an interference signal through the IRC can be expressed as Equation (24).

는 자기신호 및 잡음의 공분산 행렬을 의미한다. 이때의

는 하기의 <수학식 25>와 같이 계산되고,

는 q번째 셀의 DMRS(Demodulatin Reference Signal) 시퀀스를 의미한다.here

Denotes a covariance matrix of magnetic signals and noise. At this time

Is calculated as shown in Equation (25) below,

Denotes a Demodulatin Reference Signal (DMRS) sequence of the q-th cell.

Finally, the receiver of the present invention detects a magnetic signal through the SIC and is expressed as Equation (26) below.

은 잡음의 공분산 행렬이다.here,

Is the covariance matrix of the noise.

On the other hand, if it is determined in step S504 that the SIR value of the received signal is greater than 0, that is, if the magnitude of the magnetic signal is large, the receiver of the present invention detects the magnetic signal through the following two steps.

First, the receiver of the present invention detects a magnetic signal according to Equation (27) through IRC (S506).

은 간섭 신호 및 잡음의 공분산 행렬을 의미한다. 그 후, 본 발명의 수신기는 SIC를 통해 간섭 신호를 검출하며(S508), 이때 간섭 신호 검출은 하기의 <수학식 28>과 같이 나타낼 수 있다. here,

Denotes a covariance matrix of interference signals and noise. Then, the receiver of the present invention detects the interference signal through the SIC (S508), and the interference signal detection can be expressed as Equation (28) below.

In order to remove the detected interference signal from the received signal, the receiver of the present invention finally detects the magnetic signal through the SIC (S510). At this time, the detection equation can be expressed as Equation (26).

In the FSC of the present invention, when the ideal channel estimation technique is applied, the weight matrix of the receiver of the present invention is expressed by Equation (29).

The ideal output SINR value of the receiver (FSC) of the present invention is calculated by Equation (30) below.

At this time, intra-cell interference covariance and inter-cell interference covariance are calculated by Equation (31) below.

As described above, a receiver capable of suppressing and eliminating inter-cell interference in a side link system according to an embodiment of the present invention and a method of suppressing and eliminating inter-cell interference in the receiver have been described.

Hereinafter, an analysis result of a performance of a receiver performing the above-described procedure in an interference scenario in which neighboring cells other than a serving cell exists will be described.

Simulation was performed to analyze the performance of the receiver of the present invention. In the simulation, a system level simulation was performed on the side link instead of the link level simulation according to the LTE-A standard. Link level simulation has a limitation in considering the influence of a cell in consideration of a one-to-one relationship between a user terminal and a base station, while system level simulation has a one-to-one relationship between a user terminal and a base station or a base station and a terminal And it is a simulation method capable of accurately expressing the interference generated from other base stations.

The present invention performs a system level simulation on a side link according to the LTE-A standard, wherein the parameters used are as shown in Table 1.

The transmission rate and spectral efficiency are calculated based on the allocated resource blocks (RBs), modulation, code rate, and transport block (TB) size.

Table 2 below compares the performance of the receiver of the present invention.

The performance of the receiver (FSC) of the present invention is superior to that of a general receiver.

값으로 SINR이 높을수록 평균 UE SINR 성능 향상이 커지게 된다. In addition, FIG. 6 illustrates average UE SINR according to the receiver (FSC) of the present invention, and shows improved performance compared to a general receiver. In SINR calculation,

The higher the SINR value, the greater the average UE SINR performance improvement.

값으로 SINR이 향상되어 SINR이 증가할 수록 평균 UE 전송률 성능 향상이 커지게 된다. FIG. 7 shows an average UE transmission rate according to the receiver (FSC) of the present invention, and it is confirmed that the performance is improved as compared with a general receiver. At this time, in the SINR calculation process,

As the SINR increases and the SINR increases, the average UE transmission rate performance increases.

값으로 SINR이 향상되어 SINR이 증가할 수록 평균 UE 스펙트럼 효율 성능 향상이 커지게 된다. FIG. 8 shows average UE spectral efficiency according to the receiver (FSC) of the present invention, and it is confirmed that the performance is improved as compared with a general receiver. At this time, in the SINR calculation process,

As the SINR increases and the SINR increases, the average UE spectral efficiency performance increases.

As described above, a receiver capable of suppressing and eliminating inter-cell interference in the side link system according to an embodiment of the present invention and a method of suppressing and eliminating inter-cell interference in the receiver have been described.

The method for suppressing and eliminating inter-cell interference in the side link system according to an embodiment of the present invention as described above may be provided in the form of a computer readable medium suitable for storing computer program instructions and data.

At this time, the program recorded on the recording medium can be read and installed in the computer and executed, thereby executing the above-described functions.

In order to allow a computer to read a program recorded on a recording medium and to execute functions implemented by the program, the above-mentioned program may be stored in a computer-readable medium such as C, C ++, JAVA, machine language, and the like.

The code may include a function code related to a function or the like that defines the functions described above and may include an execution procedure related control code necessary for the processor of the computer to execute the functions described above according to a predetermined procedure. In addition, such code may further include memory reference related code as to what additional information or media needed to cause the processor of the computer to execute the aforementioned functions should be referenced at any location (address) of the internal or external memory of the computer . In addition, when a processor of a computer needs to communicate with any other computer or server that is remote to execute the above-described functions, the code may be stored in a memory of the computer using a communication module of the computer, It may further include a communication-related code such as how to communicate with another computer or a server, and what information or media should be transmitted or received during communication.

Such computer-readable media suitable for storing computer program instructions and data include, for example, magnetic media such as hard disks, floppy disks and magnetic tape, compact disk read only memory (CD-ROM) Optical media such as a DVD (Digital Video Disk), a magneto-optical medium such as a floppy disk, and a ROM (Read Only Memory), a RAM , Random Access Memory), flash memory, EPROM (Erasable Programmable ROM), and EEPROM (Electrically Erasable Programmable ROM). The processor and memory may be supplemented by, or incorporated in, special purpose logic circuits.

The computer readable recording medium may also be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner. The functional program for implementing the present invention and the related code and code segment may be implemented by programmers in the technical field of the present invention in consideration of the system environment of the computer that reads the recording medium and executes the program, Or may be easily modified or modified by the user.

Each step according to the embodiments of the present invention can be implemented by a computer system and implemented by computer-executable instructions. As used herein, a "computing system" is defined as one or more software modules, one or more hardware modules, or a combination thereof that operate in conjunction with performing an operation on electronic data. For example, the definition of a computer system includes a software module such as a personal computer's operating system and a hardware component of a personal computer. The physical layout of the module is not important. The computer system may include one or more computers connected through a network.

Likewise, a computing system may be implemented in a single physical device in which an internal module, such as a memory and a processor, operates in conjunction with performing an operation on the electronic data.

Also, as described above, the present specification includes details of a number of specific implementations, but they should not be construed as being limitations on the scope of any invention or claim, but rather on the particular embodiment of a particular invention But should be understood as an explanation of certain features. Certain features described herein in the context of separate embodiments may be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented in multiple embodiments, either individually or in any suitable subcombination. Further, although the features may operate in a particular combination and may be initially described as so claimed, one or more features from the claimed combination may in some cases be excluded from the combination, Or a variant of a subcombination.

Likewise, although the operations are depicted in the drawings in a particular order, it should be understood that such operations must be performed in that particular order or sequential order shown to achieve the desired result, or that all illustrated operations should be performed. In certain cases, multitasking and parallel processing may be advantageous. Also, the separation of the various system components of the above-described embodiments should not be understood as requiring such separation in all embodiments, and the described program components and systems will generally be integrated together into a single software product or packaged into multiple software products It should be understood.

Certain embodiments of the subject matter described herein have been described. Other embodiments are within the scope of the following claims. For example, the operations recited in the claims may be performed in a different order and still achieve desirable results. By way of example, the process illustrated in the accompanying drawings does not necessarily require that particular illustrated or sequential order to obtain the desired results. In certain implementations, multitasking and parallel processing may be advantageous.

The description sets forth the best mode of the invention, and is provided to illustrate the invention and to enable those skilled in the art to make and use the invention. The written description is not intended to limit the invention to the specific terminology presented. Thus, while the present invention has been described in detail with reference to the above examples, those skilled in the art will be able to make adaptations, modifications, and variations on these examples without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be limited by the described embodiments but should be defined by the claims.

100: transmitting unit 200: receiving unit
10-1 and 10-2: scrambling units 11-1 and 11-2:
12: Layer mapping units 13-1 and 13-2: Space-time block coder
14: pre-siding unit 15: reference signal generator
16-1, 16-2: resource element mapping unit 17-1: signal generator
22-1, 22-2: Demodulator 20: Channel estimation unit
21: receiver 23-1, 23-2: resource element mapping unit
24: Diff Recording Unit 25-1, 25-2: Space Time Block Decoder
26: Delayer mapping unit 27-1, 27-2:
28-1, 28-2: descrambling unit

Claims (11)

A signal receiving unit for receiving a signal; And
A signal to interference ratio (SIR) of a signal received through the signal receiver is calculated. When the calculated SIR value exceeds 0, a magnetic signal is detected in the received signal through an IRC (Interference Rejection Combining) The interference signal is detected by a successive interference cancellation (SIC) decoding method by applying the detected magnetic signal, and the interfering signal included in the received signal is detected. Then, the interfering signal is suppressed and removed through the SIC decoding method by applying the detected interference signal. Detects an interference signal in the received signal through the IRC decoding method when the calculated SIR value is 0 or less, and then suppresses and removes inter-cell interference through an SIC decoding method by applying the detected interference signal A signal processing unit for detecting a magnetic signal;
Wherein the inter-cell interference is suppressed and eliminated in the side link system. delete The method according to claim 1,
The signal processing unit
If the calculated SIR value is less than or equal to 0, it is determined that the size of the interference signal is large, and an interference signal included in the received signal is detected through an IRC decoding method, as shown in Equation (24) A receiver capable of suppressing and eliminating inter-cell interference in a mobile station.
&Quot; (24) &quot;

here

Denotes a covariance matrix of magnetic signals and noise. delete delete The method according to claim 1,
The signal processing unit
When the SIR value of the received signal exceeds 0, it is determined that the magnitude of the magnetic signal is large, and the magnetic signal included in the received signal is detected through the IRC decoding method as shown in Equation (27) A receiver capable of suppressing and eliminating intercell interference in a side link system.
&Quot; (27) &quot;

here

Denotes a covariance matrix of interference signals and noise. The method according to claim 6,
The signal processing unit
Wherein the interference signal is detected through an SIC decoding method by applying the magnetic signal detected through the IRC decoding method to Equation (28): < EMI ID = 28.0 >
&Quot; (28) &quot;

8. The method according to claim 3 or 7,
The signal processing unit
And the interference signal is detected, a magnetic signal obtained by removing the detected interference signal from the received signal is detected by applying Equation (26) to the receiver.
&Quot; (26) &quot;

here,

Is the covariance matrix of the noise. Receiving a signal through an antenna;
Calculating a signal to interference ratio (SIR) of the received signal;
Checking whether the calculated SIR value is greater than 0;
If the calculated SIR value exceeds 0, a magnetic signal is detected through an IRC (Interference Rejection Combining) decoding method, and the signal is included in the received signal through a Successive Interference Cancellation (SIC) decoding method using the detected magnetic signal. A first interference detection process of detecting an interference signal;
A second interference detection process of detecting an interference signal included in the received signal through an IRC decoding method if the calculated SIR value is 0 or less;
Removing the interference signal detected in the first interference detection process or the second interference detection process through the SIC decoding method from the received signal and finally detecting a magnetic signal;
/ RTI &gt; wherein the inter-cell interference in the receiver is suppressed and eliminated. delete A computer-readable recording medium recording a program for executing a method for suppressing and eliminating inter-cell interference in a receiver according to claim 9.

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