KR102603640B1 - MIMO-SEFDM System with Dual Mode Index Modulation - Google Patents
MIMO-SEFDM System with Dual Mode Index Modulation Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/345—Modifications of the signal space to allow the transmission of additional information
- H04L27/3461—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
Abstract
NT 개의 송신 안테나, NR 개의 수신 안테나 및 NF 개의 서브캐리어를 갖춘 MIMO-SEFDM 시스템은 입력되는 비트 스트림 B bit는 소정의 그룹으로 나누어서 각 하위 그룹에 b 비트가 할당되고, 각 그룹별로 SEFDM(Spectral efficient frequency division multiplexing)의 서브캐리어 수가 할당되며, SEFDM(Spectral efficient frequency division multiplexing)에 듀얼모드 인덱스 모듈레이션(Index Modulation, IM)을 사용하기 위해, 각 하위 그룹의 비트가 b1과 b2로 더 세분화되고, b1은 서브캐리어 부분 집합 SA를 선택하는데 활용되고 나머지 서브캐리어는 SB로 고려되되, SA는 Mode A로 SB는 Mode B로 각각 전송되는 것을 특징으로 한다.A MIMO-SEFDM system equipped with N T transmit antennas, N R receive antennas, and N F subcarriers divides the input bit stream B bit into predetermined groups, and b bits are assigned to each subgroup, and SEFDM for each group. The number of subcarriers of (Spectral efficient frequency division multiplexing) is allocated, and in order to use dual-mode index modulation (IM) in SEFDM (Spectral efficient frequency division multiplexing), the bits of each subgroup are divided into b 1 and b 2 . In further detail, b 1 is used to select a subcarrier subset S A and the remaining subcarriers are considered as S B , with S A being transmitted in Mode A and S B being transmitted in Mode B, respectively.
Description
본 발명은 주파수 효율을 향상시키는 기술에 관한 것으로서, 더 상세하게는 듀얼모드 지수변조를 적용한 MIMO-SEFDM 시스템에 관한 것이다.The present invention relates to a technology for improving frequency efficiency, and more specifically, to a MIMO-SEFDM system applying dual-mode exponential modulation.
제한된 주파수는 미래 무선 통신 시스템의 근본적인 문제이다.Limited frequency is a fundamental problem for future wireless communication systems.
SEFDM(Spectral efficient frequency division multiplexing)은 기존의 직교주파수 분할 멀티플렉싱(Orthogonal frequency division multiplexing, OFDM)이 제공하는 것과 동일한 이점으로 더 적은 대역폭을 활용하여 주파수 효율을 향상시키는 기능을 가지고 있다.Spectral efficient frequency division multiplexing (SEFDM) has the same benefits as existing orthogonal frequency division multiplexing (OFDM) and has the ability to improve frequency efficiency by utilizing less bandwidth.
SEFDM(Spectral efficient frequency division multiplexing)의 개념은 FTN(faster than Nyquist) 신호보다 더 빠르게 발생하며, 서브캐리어를 압축하고 기존의 직교주파수 분할 멀티플렉싱(Orthogonal frequency division multiplexing, OFDM)의 직교성을 일부 위반하여 다중 반송파 시스템에 대한 스펙트럼 효율성 이득을 달성한다.The concept of SEFDM (Spectral efficient frequency division multiplexing) occurs faster than FTN (faster than Nyquist) signals, compresses subcarriers, and partially violates the orthogonality of existing orthogonal frequency division multiplexing (OFDM) to create multiple signals. Achieve spectral efficiency gains for the carrier system.
M-ary 변조와 함께 선택된 하위 반송파 지수를 통해 추가 비트를 전송하는 SEFDM(Spectral efficient frequency division multiplexing) 기반 듀얼 지수 변조(Index Modulation, IM)를 통해 추가적인 정보를 전송한다.Additional information is transmitted through SEFDM (Spectral efficient frequency division multiplexing)-based dual index modulation (IM), which transmits additional bits through the selected lower carrier index along with M-ary modulation.
기존의 OFDM-IM 은 전체 서브 캐리어들 중 일부만 사용되지만 제안하고자 하는 듀얼 모드 SEFDM-IM 에서는 모든 서브캐리어들을 다 활용한다. 대신에 특정 서브캐리어들만 다른 방식의 성상도를 활용함으로써 추가적인 정보를 전송한다.The existing OFDM-IM uses only a portion of all subcarriers, but the proposed dual mode SEFDM-IM utilizes all subcarriers. Instead, only specific subcarriers transmit additional information by using a different constellation.
본 발명은 상기와 같은 기술적 과제를 해결하기 위해 제안된 것으로, 기존의 OFDM-IM 은 전체 서브 캐리어들 중 일부만 사용되지만 제안하고자 하는 듀얼 모드 SEFDM-IM 에서는 모든 서브캐리어들을 다 활용하며, 대신에 특정 서브캐리어들만 다른 방식의 성상도를 활용함으로써 추가적인 정보를 전송할 수 있다.The present invention was proposed to solve the above technical problems. The existing OFDM-IM uses only a portion of all subcarriers, but the proposed dual mode SEFDM-IM utilizes all subcarriers, and instead uses specific Only subcarriers can transmit additional information by using different constellations.
상기 문제점을 해결하기 위한 본 발명의 일 실시예에 따르면, NT 개의 송신 안테나, NR 개의 수신 안테나 및 NF 개의 서브캐리어를 갖춘 MIMO-SEFDM 시스템에 있어서, 입력되는 비트 스트림 B bit는 소정의 그룹으로 나누어서 각 하위 그룹에 b 비트가 할당되고, 각 그룹별로 SEFDM(Spectral efficient frequency division multiplexing)의 서브캐리어 수가 할당되며, SEFDM(Spectral efficient frequency division multiplexing)에 듀얼모드 인덱스 모듈레이션(Index Modulation, IM)을 사용하기 위해, 각 하위 그룹의 비트가 b1과 b2로 더 세분화되고, b1은 서브캐리어 부분 집합 SA를 선택하는데 활용되고 나머지 서브캐리어는 SB로 고려되되, SA는 Mode A로 SB는 Mode B로 각각 전송되는 것을 특징으로 하는 듀얼모드 지수변조를 적용한 MIMO-SEFDM 시스템이 제공된다.According to an embodiment of the present invention to solve the above problem, in a MIMO-SEFDM system equipped with N T transmit antennas, N R receive antennas, and N F subcarriers, the input bit stream B bit is predetermined. Divided into groups, b bits are allocated to each subgroup, the number of subcarriers of SEFDM (Spectral efficient frequency division multiplexing) is allocated to each group, and dual-mode index modulation (IM) is applied to SEFDM (Spectral efficient frequency division multiplexing). To use, the bits of each subgroup are further divided into b 1 and b 2 , b 1 is used to select the subcarrier subset S A , and the remaining subcarriers are considered as S B , and S A is used in Mode A. A MIMO-SEFDM system applying dual-mode exponential modulation is provided, where S B is transmitted in Mode B, respectively.
또한, 본 발명에서 Mode B는 기준 성상도이고, Mode A는 기준 성상도를 소정의 각도로 회전시킨 성상도를 갖는 것을 특징으로 한다.Additionally, in the present invention, Mode B is a reference constellation, and Mode A is characterized by having a constellation in which the reference constellation is rotated at a predetermined angle.
또한, 본 발명에서 어떠한 성상도를 사용하는지를 추가 정보로 활용하는 것을 특징으로 한다.In addition, the present invention is characterized by using the constellation used as additional information.
기존의 OFDM-IM 은 전체 서브 캐리어들 중 일부만 사용되지만 제안하고자 하는 듀얼 모드 SEFDM-IM 에서는 모든 서브캐리어들을 다 활용한다. 대신에 특정 서브캐리어들만 다른 방식의 성상도를 활용함으로써 추가적인 정보를 전송한다.The existing OFDM-IM uses only a portion of all subcarriers, but the proposed dual mode SEFDM-IM utilizes all subcarriers. Instead, only specific subcarriers transmit additional information by using a different constellation.
도 1은 종래의 방식과 제안된 듀얼모드 SEFDM-IM 방식을 비교한 도면
도 2는 듀얼모드 성상도의 예시도
도 3은 MIMO(Multiple Input Multiple Output)네트워크를 위한 듀얼모드 SEFDM-IM의 시스템 모델을 나타낸 도면
도 4는 각 OFDM-IM, SEFDM-IM 과 제안된 DM-SEFDM-IM의 성능을 비교한 도면Figure 1 is a diagram comparing the conventional method and the proposed dual-mode SEFDM-IM method.
Figure 2 is an example of a dual-mode constellation diagram.
Figure 3 is a diagram showing a system model of dual-mode SEFDM-IM for MIMO (Multiple Input Multiple Output) network.
Figure 4 is a diagram comparing the performance of each OFDM-IM, SEFDM-IM and the proposed DM-SEFDM-IM
이하, 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 본 발명의 기술적 사상을 용이하게 실시할 수 있을 정도로 상세히 설명하기 위하여, 본 발명의 실시예를 첨부한 도면을 참조하여 설명하기로 한다.Hereinafter, in order to explain the present invention in detail so that a person skilled in the art can easily implement the technical idea of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.
도 1은 종래의 방식과 제안된 듀얼모드 SEFDM-IM 방식을 비교한 도면이고, 도 2는 듀얼모드 성상도의 예시도이다.Figure 1 is a diagram comparing the conventional method and the proposed dual-mode SEFDM-IM method, and Figure 2 is an example diagram of a dual-mode constellation.
도 1을 참조하면, 위에서 아래 순서대로 OFDM, SEFDM, OFDM-IM, SEFDM-IM, 그리고 제안하는 듀얼모드 SEFDM-IM이다.Referring to Figure 1, in order from top to bottom, they are OFDM, SEFDM, OFDM-IM, SEFDM-IM, and the proposed dual mode SEFDM-IM.
OFDM-IM은 특정 서브캐리어 중 일부를 사용하는데 어떤 서브캐리어를 사용하는지를 이용하여 인덱스 모듈레이션(Index Modulation)을 수행한다. 가령 도 2에서는 OFDM-IM/SEFDM-IM의 4개의 서브캐리어 중 2개의 서브캐리어를 사용하는 예를 도시하였다. 이 경우 log2(4c2)의 내림값인 2비의 정보를 전송할 수 있다. 그러나 본질적으로 4개의 서브캐리어 중 2개만 사용하기 때문에 자원 낭비가 발생한다.OFDM-IM uses some of specific subcarriers and performs index modulation using which subcarriers are used. For example, Figure 2 shows an example of using two subcarriers out of four subcarriers of OFDM-IM/SEFDM-IM. In this case, information of the ratio of 2, which is the rounded value of log 2 (4c2), can be transmitted. However, since only two of the four subcarriers are essentially used, resources are wasted.
제안하고자 하는 듀얼모드 SEFDM-IM(DM-SEFDM-IM)은 4개의 서브캐리어를 모두 사용하는데 각 서브캐리어에 다른 성상도를 도입하여 추가 정보를 보내게 된다.The proposed dual-mode SEFDM-IM (DM-SEFDM-IM) uses all four subcarriers, and additional information is sent by introducing a different constellation on each subcarrier.
즉, 도 2와 같이 정상적인 성상도 Mode B와 90도 회전 시킨 성상도 Mode A와 같이 다른 성상도를 사용하고 어떠한 성상도를 사용하는지가 추가 정보로 활용되는 것이다. 이외에도 모드를 만드는 다양한 방법들이 존재할 수 있다. 가령 45도 회전, 60도 회전 등등 이 있으며, 또한 모드의 개수도 늘릴 수 있다.In other words, as shown in Figure 2, different constellations are used, such as the normal constellation Mode B and the 90-degree rotated constellation Mode A, and which constellation is used is used as additional information. In addition, there may be various ways to create a mode. For example, there are 45-degree rotation, 60-degree rotation, etc., and the number of modes can also be increased.
도 3은 MIMO(Multiple Input Multiple Output)네트워크를 위한 듀얼모드 SEFDM-IM의 시스템 모델을 나타낸 도면이다.Figure 3 is a diagram showing a system model of a dual-mode SEFDM-IM for a MIMO (Multiple Input Multiple Output) network.
도 3을 참조하면, NT 송신 안테나, NR 수신 안테나, NF 서브캐리어를 갖춘 MIMO-SEFDM 시스템이 고려된다.Referring to Figure 3, a MIMO-SEFDM system with N T transmit antenna, N R receive antenna, and N F subcarriers is considered.
들어오는 비트 스트림 B bit는 G그룹으로 나뉘어서 각 하위 그룹에 b 비트가 할당되고,The incoming bit stream B bit is divided into G groups and B bit is assigned to each subgroup.
각 그룹별로 SEFDM(Spectral efficient frequency division multiplexing)의 서브캐리어 수가 N=NF/G 로 할당된다.For each group, the number of subcarriers of SEFDM (Spectral efficient frequency division multiplexing) is allocated as N=N F /G.
SEFDM(Spectral efficient frequency division multiplexing)의 경우, 서브캐리어는 α<1 인자로 압축된다.In the case of SEFDM (Spectral efficient frequency division multiplexing), subcarriers are compressed by a factor of α<1.
SEFDM(Spectral efficient frequency division multiplexing)에 듀얼모드 인덱스 모듈레이션(Index Modulation, IM)을 사용하기 위해, 각 하위 그룹의 비트는 b1과 b2로 더 세분화된다. b1은 서브캐리어 부분 집합 SA를 선택하는데 활용되고 나머지 서브캐리어는 SB로 고려된다. 그런 다음 SA는 Mode A로 SB는 Mode B로 각각 전송된다.To use dual-mode index modulation (IM) in SEFDM (Spectral efficient frequency division multiplexing), the bits of each subgroup are further divided into b 1 and b 2 . b 1 is used to select the subcarrier subset S A and the remaining subcarriers are considered S B. Then, S A is transmitted to Mode A and S B is transmitted to Mode B, respectively.
이 경우 전송 용량은 하기 식과 같이 표현된다.In this case, the transmission capacity is expressed as the following equation.
도 4는 각 OFDM-IM, SEFDM-IM 과 제안된 DM-SEFDM-IM의 성능을 비교한 도면이다.Figure 4 is a diagram comparing the performance of each OFDM-IM, SEFDM-IM and the proposed DM-SEFDM-IM.
도 4를 참조하면, 제안된 DM-SEFDM-IM 의 성능이 가장 우수한 것을 확인 할 수 있다.Referring to Figure 4, it can be seen that the performance of the proposed DM-SEFDM-IM is the best.
이와 같이, 본 발명이 속하는 기술분야의 당업자는 본 발명이 그 기술적 사상이나 필수적 특징을 변경하지 않고서 다른 구체적인 형태로 실시될 수 있다는 것을 이해할 수 있을 것이다. 그러므로 이상에서 기술한 실시예들은 모든 면에서 예시적인 것이며 한정적인 것이 아닌 것으로서 이해해야만 한다. 본 발명의 범위는 상기 상세한 설명보다는 후술하는 특허청구범위에 의하여 나타내어지며, 특허청구범위의 의미 및 범위 그리고 그 등가개념으로부터 도출되는 모든 변경 또는 변형된 형태가 본 발명의 범위에 포함되는 것으로 해석되어야 한다.As such, a person skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. The scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.
Claims (3)
입력되는 비트 스트림 B bit는 소정의 그룹으로 나누어서 각 하위 그룹에 b 비트가 할당되고, 각 그룹별로 SEFDM(Spectral efficient frequency division multiplexing)의 서브캐리어 수가 할당되며,
SEFDM(Spectral efficient frequency division multiplexing)에 듀얼모드 인덱스 모듈레이션(Index Modulation, IM)을 사용하기 위해, 각 하위 그룹의 비트가 b1과 b2로 더 세분화되고, b1은 서브캐리어 부분 집합 SA를 선택하는데 활용되고 나머지 서브캐리어는 SB로 고려되되, SA는 Mode A로 SB는 Mode B로 각각 전송되는 것을 특징으로 하는
듀얼모드 지수변조를 적용한 MIMO-SEFDM 시스템.
In a MIMO-SEFDM system with N T transmit antennas, N R receive antennas, and N F subcarriers,
The input bit stream B bit is divided into predetermined groups, b bits are allocated to each subgroup, and the number of subcarriers of SEFDM (Spectral efficient frequency division multiplexing) is allocated to each group,
To use dual-mode index modulation (IM) in SEFDM (Spectral efficient frequency division multiplexing), the bits of each subgroup are further divided into b 1 and b 2 , and b 1 represents the subcarrier subset S A. It is used for selection, and the remaining subcarriers are considered as S B , but S A is transmitted in Mode A and S B is transmitted in Mode B, respectively.
MIMO-SEFDM system applying dual-mode exponential modulation.
Mode B는 기준 성상도이고, Mode A는 기준 성상도를 소정의 각도로 회전시킨 성상도를 갖는 것을 특징으로 하는 듀얼모드 지수변조를 적용한 MIMO-SEFDM 시스템.
According to paragraph 1,
Mode B is a reference constellation, and Mode A is a MIMO-SEFDM system using dual-mode exponential modulation, characterized in that it has a constellation in which the reference constellation is rotated at a predetermined angle.
어떠한 성상도를 사용하는지를 추가 정보로 활용하는 것을 특징으로 하는 듀얼모드 지수변조를 적용한 MIMO-SEFDM 시스템.According to paragraph 2,
A MIMO-SEFDM system using dual-mode exponential modulation, which uses additional information to determine which constellation is used.
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