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Nakagami-m 페이딩 채널에서 GCIODs로 얻은 STBCs의 에르고딕 용량에 대한 연구
이후진,정영모,Lee, Hoo-Jin,Chung, Young-Mo 한국통신학회 2010 韓國通信學會論文誌 Vol.35 No.5c
In this paper, we derive exact closed-form formulas, in terms of Meijer's G-function, for the ergodic capacity of space-time block codes (STBCs) from generalized linear complex orthogonal designs (GLCODs) and generalized coordinate interleaved orthogonal designs (GCIODs) in quasi-static frequency-nonselective i.i.d. Nakagami-m fading channels. The derived analytical results show an excellent agreement with Monte-Carlo simulation results. Thus, a useful means for analyzing and predicting the ergodic capacity performance of STBCs from GLCODs or GCIODs can be provided in various antenna configurations and different channel conditions without extensive Monte-Carlo simulations. We present some numerical results to verify the accuracy of the derived formulas. 본 논문에서는 주파수 비선택성이고 준정적인 동일 분포 독립 Nakagami-m 페이딩 채널에서 GLCODs(Generalized Linear Complex Orthogonal Designs)와 GCIODs(Generalized Coordinate Interleaved Orthogonal Designs)로 얻은 STBCs(Space-Time Block Codes)의 에르고딕 용량을 Meijer의 G함수로 표현되는 닫힌꼴로 유도한다. 유도된 해석적 결과는 Monte-Carlo 모의실험 결과와 매우 잘 일치함을 보였다. 그러므로 대규모 Monte-Carlo 모의실험 없이 다양한 안테나 구성과 상이한 채널환경에서 GLCODs와 GCIODs로 얻은 STBCs의 에르고딕 용량 성능을 분석하고 예측하는 유용한 기법이 제안되었다고 할 수 있다. 마지막에는 유도된 식의 정확도를 입증하는 수치적인 결과들을 제시한다.
Asymptotic Error Probability Analysis of M-ary Modulation Schemes in Hoyt Fading Channels
이후진 한국정보기술학회 2014 한국정보기술학회논문지 Vol. No.
This paper derives simple asymptotic closed-form formulas for the average error probabilities of various M-ary modulation schemes (i.e., M-ary differentially coherent phase shift-keying (DPSK) signals, noncoherent correlated binary (NCB) signals, M-ary coherent phase shift-keying (PSK) signals, and M-ary square quadrature amplitude modulation (QAM)), especially in Hoyt (or Nakagami-q) fading channels, since the formula can be effectively used to study the asymptotically achievable error performance. The derived expressions for the representative modulation schemes are much more concise than the existing conventional formulas, showing the very tightness to the error probability results from the existing exact formulas in the high signal-to-noise ratio (SNR) region. Through the rigorous numerical results, we clearly justify the validity of our derivations and analyses.
이후진 한국정보기술학회 2016 JOURNAL OF ADVANCED INFORMATION TECHNOLOGY AND CON Vol.6 No.1
To effectively assess the symbol error rate (SER) performance achieved by p/4 differential quaternary phase shift keying (p/4-DQPSK) with Gray coding over Rician-Nakagami fading channels, a simple closed-form asymptotic SER formula is derived, which is much simpler than the existing exact SER expression. From the proposed simple closed-form formula, we can obtain some useful insights into the achievable error rate performance for the DQPSK modulation with Gray coding for various channel conditions in the high signal-to-noise ratio (SNR) regions.
이후진 한국정보기술학회 2016 JOURNAL OF ADVANCED INFORMATION TECHNOLOGY AND CON Vol.6 No.2
In this paper, we derive exact and asymptotic bit error rate (BER) formulas of differential binary phase shift keying (DBPSK) and non-coherent frequency shift keying (NCFSK) modulations for orthogonal frequency division multiplexing (OFDM) system employing maximal ratio combining (MRC) receive diversity technique, especially over correlated Nakagami-m fading channels. In particular, exploiting the derived asymptotic BER formulas, asymptotic modulation gain and diversity order can be subsequently achieved, which enable us to easily predict the performance limit of the considered system and channel environments. Based on our asymptotic analysis, we can also analytically demonstrate the asymptotic SNR performance gap between DBPSK and NCFSK
이후진(Hoo-Jin Lee),윤원영(Won Young Yun) 한국신뢰성학회 2010 신뢰성응용연구 Vol.10 No.1
In this paper, an accelerated degradation test procedure for an electronic appliance compressor is proposed. We investigate the amount of wear of the compressor and consider several factors as accelerating factors. Finally we select the operating pressure as a main accelerating factor. The test condition of accelerated degradation test is determined. The modified accelerating test reduces the test time in design phase by using the suggested accelerating factor.
Hoojin Lee(이후진) 대한전자공학회 2018 전자공학회논문지 Vol.55 No.3
본 논문에서는 Hoyt 페이딩 채널에서 MRC 다이버시티 및 저복잡도 Greedy 신호 검출 기법이 적용된 MCIK-OFDM 시스템의 평균 쌍 오류 확률 (pairwise error probability)의 상한 (upper bound)에 대한 효율적인 닫힌 형태의 새로운 수식을 유도한다. 또한, 이를 이용하여 주어진 시스템 및 채널 환경에서 대표적인 시스템 점근 성능 지표들 (점근적 평균 쌍 오류 확률 상한, 부호 이득, 다이버시티 계수 등)의 수식을 유도 및 분석하였으며, 이로부터 높은 신호 대 잡음비 (SNR) 영역에서 Hoyt 페이딩 채널이 MCIK-OFDM 시스템의 오류 확률 성능에 미치는 영향을 보다 명확하게 예측할 수 있게 된다. 유도되고 분석된 결과들의 타당성을 입증하기 위한 다양한 수치 결과들을 제시한다. In this paper, a novel and effective closed-form formula is derived for the upper bound on the overall average pairwise error probability (PEP) of a multi-carrier index keying orthogonal frequency division multiplexing (MCIK-OFDM) system employing maximal ratio combining (MRC) diversity and low-complexity greedy detection techniques over Hoyt fading channels. Based on the derived formula, asymptotic analyses (e.g., asymptotic upper bound, achievable coding gain, diversity gain, etc.) are also performed, which enable us to more explicitly evaluate the achievable error probability performance in the high signal-to-noise ratio (SNR) regime especially under Hoyt fading. Some numerical results are demonstrated to verify our analytical results.