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다중경로 UWB-MIMO 채널에서 Lattice-Reduction이 적용된 Zero-Forcing 선형수신기의 성능 분석
김영범(Youngbeom Kim),김상준(Sangchoon Kim) 한국정보기술학회 2018 한국정보기술학회논문지 Vol.16 No.5
In indoor wireless UWB(Ultra-Wide-Band) communications, MIMO(Multiple-Input Multiple-Output) technology can be combined with UWB systems to enable low-power, high-speed communications. Spatially multiplexed UWB signals can be separated by a ZF(Zero-Forcing) linear receiver. Although the ZF receiver has the advantage of low complexity and easy implementation, noise amplification occurs in the process of separating the spatial data stream, resulting in performance degradation. LR(Lattice-Reduction) techniques create a more orthogonal virtual channel matrix than the original channel matrix and thus reduce the noise amplification by LR-aided ZF receivers. The performance of the LR-based ZF receiver proposed in this work is evaluated and compared with other receivers by simulations.
펄스 기반의 공간다중화 초광대역 시스템을 위한 Zero-Forcing 수신기들의 성능 비교 및 분석
김영범(Youngbeom Kim),김상준(Sangchoon Kim) 한국정보기술학회 2018 한국정보기술학회논문지 Vol.16 No.10
This paper deals with ZF(Zero-Forcing)-based MIMO(Multiple Input Multiple Output) detection methods for spatial multiplexing UWB(Ultra-WideBand) MIMO systems on indoor log-normal multipath fading channels. The conventional ZF detector for a single path channel is extended to log-normal multipath channels and consequently an extended ZF(eZF) receiving structure is considered as a simple implementable version and described in details. The diversity gain offered by the eZF receiver is theoretically analyzed and accordingly its theoretical average BER(Bit Error Rate) expression is derived. Moreover, the eZF detection scheme is compared with other ZF-based MIMO detectors through simulations and theoretical results. In the simulation results, the simple eZF receiver shows better performance than the ZF-Rake receiver, and matches the 2Rake-ZF receiver in terms of theoretical average BER performance.
다중경로 로그-정규 페이딩 채널에서 공간다중화 일반화된 공간변조 시스템을 위한 격자 감소 기반의 수신기의 성능
김영범(Youngbeom Kim),김상준(Sangchoon Kim) 한국정보기술학회 2019 한국정보기술학회논문지 Vol.17 No.2
Generalized spatial modulation(GSM) technology is one of the major technology candidates for next generation wireless communication technology using many antennas. The GSM signal transmits data with symbols and index of a selected group of transmit antenna combinations. If the number of selected antennas for high data-throughput is increased, the main drawback is that the receiver should detect a signal with a very complicated receiver. In this paper, a spatial multiplexing(SMX)-GSM system in a multipath log-normal distribution fading channel is designed, and we introduce a low complexity Lattice-Reduction(LR)-based receiver using multipath to detect signals. The performance of the proposed receiver is evaluated and compared with existing GSM receivers through computer simulation. Simulation results show that when a sufficient multipath is available at the receiver side, the bit error rate performance is better than 0.5 dB over the conventional receiver with a very low complexity.
일반화된 정규 라플라시안 기반의 다중사용자 UWB 수신기의 FPGA 구현
김영범(YoungBeom Kim),안진영(JinYoung An),김상준(Sangchoon Kim) 한국정보기술학회 2013 Proceedings of KIIT Conference Vol.2013 No.5
본 논문은 다중 사용자 간섭 (Multi-User Interference: MUI)이 존재하는 환경에서 UWB(Ultra-Wide Bandwidt h) 신호를 검출하기 위한 GNL(Generalized Normal Laplacian) 확률 분포 함수 기반의 수신기를 FPGA(Field-Pro grammable Gate Array)로 구현하고자 한다. Xilinx ML402 Virtex4 xc4vsx35 ff668-10 타깃 보드에 Hardware Co -simulation을 수행한 결과와 MATLAB 시뮬레이션 결과를 비교 분석하여 구현 가능성을 검토하였다. 그리고 성능 검증을 위해 타이밍 분석과 동시에 Resource량을 확인하였다. This paper designs Field-Programmable Gate Array (FPGA) for Generalized Normal Laplacian (GNL) Receiver to detect the ultra-wide bandwidth (UWB) signal over multi-user interference (MUI) environments. The FPGA implementation through the Hardware Co-simulation with Xilinx ML402 Virtex4 xc4vsx35 ff668-10 Target Device was examined by analyzing and comparing with the result of MATLAB simulation model. In addition, the performance was verified by confirming the timing analysis and resource estimation.
Time-Switched 수신 다이버시티를 이용하는 Prerake UWB MIMO 시스템 성능
김길남(Gil-Nam Kim),안진영(Jinyoung An),김상준(Sangchoon Kim) 한국정보기술학회 2011 한국정보기술학회논문지 Vol.9 No.4
In this paper, we evaluate the bit error rate performance of ultra wideband (UWB) multiple-input multiple-output (MIMO) systems using prerake at transmitter and time-switched receive diversity (TSRD) scheme at receiver over UWB IEEE 802.15.3a multipath channels. The performance of Prerake diversity combining TSRD UWB MIMO systems is compared with that of rake diversity combining time-switched transmit diversity (TSTD) UWB MIMO systems. From simulation results, it is observed that the prerake TSRD UWB MIMO systems reduce receiver complexity and have equivalent performance to the TSTD rake UWB MIMO systems.
Prerake 송신 신호처리에 기반한 UWB MIMO 시스템 성능분석
안진영(Jinyoung An),김상준(Sangchoon Kim) 한국정보기술학회 2010 한국정보기술학회논문지 Vol.8 No.9
In this paper, a prerake diversity combining scheme for detection of a single data stream in ultra-wideband (UWB) multiple input multiple output (MIMO) systems is considered. For a UWB MIMO system, the BER performance of a linear transmit prerake diversity scheme is presented in a log-normal multipath fading channel and also compared with that of a linear receive diversity combining approach. From the results, the prerake diversity combining UWB MIMO systems, which can significantly reduce the complexity of the receiver side, are shown to provide the same performance as the rake diversity combining case. It is also observed that when the number of transmit antennas is equal to the number of receive antennas, the performance of prerake systems is improved at large antenna dimension and degraded due to the increase of interference components at low antenna dimension and high SNR regions.
UWB MIMO 시스템에서 Prerake 결합방식에 기반한 MMSE-OSIC 수신기의 성능
안진영(Jinyoung An),김상준(Sangchoon Kim) 한국정보기술학회 2011 Proceedings of KIIT Conference Vol.2011 No.5
본 연구는 prerake 다이버시티(diveristy) 결합 기술에 기반한 초광대역 다중 입출력 (ultra-wideband multiple input multipl output: UWB MIMO) 수신기를 제시하고, 그 성능을 평가한다. 제시된 송신 다중경로 선 처리 (preprocess)에 기반한 UWB SM (spatial multiplexing) 시스템은 전송 속도를 증가 시키거나 충분한 다이버시티 이득을 제공하여 비트오율 성능을 향상 시킨다. 채널간 간섭 성분을 해결하기 위해 ZF (zero forcing), MMSE (minimum mean square error), OSIC (ordered successive interference cancellation) UWB-MIMO 수신기가 사용되며, 로그 정규 다중 경로 페이딩 채널에서 각 수신기의 성능을 비교 분석한다. In this work, various ultra-wideband multiple input multiple output (UWB-MIMO) receivers based on a prerake diversity combining scheme are presented and their performance is evaluated. The presented UWB SM systems based on transmitter-side multipath preprocessing can either boost the transmission data rate or offer significant diversity gain and improved BER performance. UWB MIMO detecters such as Zero forcing, minimum mean square error and ordered successive interference cancellation are considered in order to cope with inter-channel interference, and the performance of each receivers is comparatively studied over a log-normal multipath fading channel.
심볼간 간섭이 존재하는 MIMO 채널에서 공간 다중화 검출기의 성능평가
안진영(Jinyoung An),김길남(Gilnam Kim),김상준(Sangchoon Kim) 한국정보기술학회 2009 Proceedings of KIIT Conference Vol.2009 No.-
본 논문에서는 심볼간 간섭(Inter-Symbol Interference: ISI)이 존재하는 다중입력 다중출력 (Multiple Input Multiple Output: MIMO) 시스템에서 공간 다중화 수신기의 성능을 평가한다. 각각의 송신 안테나에서 채널로 전송되는 독립적인 신호는 QPSK 방식을 사용하여 변조되며, 채널은 산란이 활발하게 일어난다고 가정한다. 공간적으로 다중화되어 수신되는 신호는 현재 입력된 신호와 이전에 수신된 신호의 조합으로 구성된다. ISI가 존재하는 채널의 신호를 검출하기 위해 DFE (Decision Feedback Equalizing), OSIC (Ordered Successive Interference Cancellation), SQRD (Sorted QR Decomposition) 알고리즘이 사용되며, 각 수신기의 BER 성능과 부동 소수점 연산량(Floating Point Operation: FLOPS)을 각각 비교 분석한다. In this paper, the performance of the spatial multiplexing receivers are analyzed at MIMO system with intersymbol interference. The independent signals from each transmit antennas are modulated by using the QPSK modulation in the richly scattered fading channel. The received signals which are spatially multiplexed are a combination of both the current and past symbols. The employed receivers for detecting the signals with ISI are DFE, OSIC and SQRD algorithms. We analyze the BER performance and the floating point operations of each receivers.