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빠른 레일리 페이딩채널에서 MTCM 부호와 STBC를 결합한 시스템의 성능평가
진익수,Jin, Ik-Soo 한국ITS학회 2009 한국ITS학회논문지 Vol.8 No.6
STBC는 부호이득을 얻을 수 없지만, 비교적 적은 부호기와 복호기의 복잡도를 가지고 완전한 다이버시티 이득을 얻을 수 있다. 따라서 STBC는 부호이득이 없기 때문에 부호이득을 얻을 수 있는 외부 부호와 결합되어 사용하여야 한다. 본 논문에서는 완전한 다이버시티 이득과 함께 상당한 부호이득을 얻기 위하여, MTCM부호와 STBC를 결합한 시스템을 고려하였다. 공정한 성능 비교를 위하여 동일한 전송 전력, 동일한 대역폭 효율 그리고 동일한 상태 수를 전제하고, 고려한 시스템과 기존에 알려진 STTC부호와 FER 성능 비교를 실시하였다. 모의실험 결과, MTCM부호와 STBC를 결합한 시스템의 성능은 빠른 레일리 페이딩 채널에서 2개의 송신기 안테나와 1개의 수신기 안테나를 사용하는 STTC부호 보다 우수한 성능을 보여주었다. Space-time block codes (STBC) have no coding gain but they provide a full diversity gain with relatively low encoder/decoder complexity. Therefore, STBC should be concatenated with an outer code which provides an additional coding gain. In this paper, we consider the concatenation of multiple trellis-coded modulation (MTCM) codes with STBC for achieving significant coding gain with full antenna diversity. Using criteria of equal transmit power, spectral efficiency and the number of trellis states, the performance of concatenated scheme is compared to that of previously known space-time trellis codes (STTC) in terms of frame error rate (FER). Simulation results show that MTCM codes concatenated with STBC offer better performance on fast Rayleigh fading channels, than previously known STTC with two transmit antennas and one receive antenna.
신호좌표를 최적화한 Trellis 부호를 적용한 DS/SSMA 시스템의 성능 분석
진익수,곽흥식,조관,황금찬,Jin, Ik-Soo,Kwak, Heung-Sik,Cho, Kwan,Whang, Keum-Chan 한국통신학회 1994 韓國通信學會論文誌 Vol.19 No.11
본 논문에서는 Feedforward형 Trellis 부호기를 사용하여, 신호좌표를 최적화한 DS/SSMA 시스템을 제안하고, AWGN 채널에서 비트오율을 유도하였다. 2-상태와 4-상태에서, Trellis 부호화된 4 PSK(부호율 1/2), 8-PSK(부호율 2/3)를 선정하여, 신호좌표를 최적화하지 않고 Feedback형 Trellis 부호기를 사용한 Boudreau의 시스템과 비교하였다. TCM의 해석은 일반화된 전달함수 방법을 이용하였으며, 다중간섭신호의 해석에는 n차의 모멘트를 구하여 계산하는 모멘트 방법을 사용하였다. 분석한 결과, 제안된 시스템의 성능을 Boudreau의 시스템보다 항상 우수하였다. 비트 오율이 Pn=10 일때 AWGN 채널에서 $0.2dB\sim2.4dB$ 정도의 성능개선을 보였다. In this parper, the performance of trellis coded DS/SSMA system using feedforward trellis encoder with sasymmetric signal constellation are evaluated over AW(In channel. The numerical results of trellis coded 4 PSK(code rate 1/2)and 8-PSK(code rate2/3) are calculated for 2-state and 4-state cases and compared with those of the Boudreau's system using feedback trellis encoder without optimizing the signal constellation. The method of moments is employed to evaluate the multiple access interference, in conjunction with the generalized transfer function techniques for trellis code. The numerical results show that the proposed system in this paper is always better than the Boudreau's system over AWGN channel; particularly at $P_b:10$, $0.2dB\sim2.4dB$ improvement over AWGN channel are obtained.
진익수,조관,안재영,이진호,황금찬,Jin, Ik-Soo,Cho, Kwan,Ahn, Jae-Young,Lee, Jin-Ho,Whang, Keum-Chan 한국통신학회 1996 韓國通信學會論文誌 Vol.21 No.1
The purpose of this paper is to provide an algorithm in which the procedure of constructing a superstate transition matrix for trellis codes is reduced and, as a result, make it easier to evaluate the performance of a TCM scheme when the generalized transfer function method is used. In this paper, an algorithm for constructing a superstate transition matrix and an algorithm for reducing the matrix easily are addressed and applied to an MTCM scheme as an example. It is shown that the algorithm is very useflul for trellis codes with a large number of states and/or parallel transitions.
느린 페이딩 채널에서 시공간 블록부호와 결합한 다중 트렐리스 격자부호에 대한 연구
진익수(Ik Soo Jin) 한국정보기술학회 2014 한국정보기술학회논문지 Vol.12 No.12
In this paper, concatenated space-time block codes (STBC) with trellis coded modulation (TCM) or multiple trellis coded modulation (MTCM) for achieving significant coding gain with full antenna diversity is studied over slow varying Rayleigh fading or Rician fading channels. We present simulation results for a variety of channel codes, including TCM codes, Divsalar et al.‘s MTCM codes, and Periyalwar et al.’s MTCM codes. We also drive a pairwise error probability expression on slow varying Rayleigh fading or Rician fading channels, that reveals the dominant factors affecting performance. From simulation results, it is shown that concatenated STBC with MTCM codes outperforms space-time trellis codes (STTC) under the same spectral efficiency, trellis complexity, and signal constellation.
빠른 페이딩 채널에서 고속 데이터 전송을 위한 8-PSK 시공간격자 부호의 성능개선
진익수(Ik Soo Jin) 한국정보기술학회 2009 한국정보기술학회논문지 Vol.7 No.6
Space-time trellis code (STTC) has provided powerful means to effectively combine diversity and coding gain over wireless channels. Tarokh et al. have proposed the design criterion for STTC on the fast fading channel. Maeng et al. have presentd a modified performance criterion which generally applies to both STTCs and concatenation schemes, and demonstrate the criterion accurately predicts the code performance. In this paper, we present a new 8-PSK (8-state) STTC with 2 transmit antennas for fast fading channels by applying the modified STTC design criterion of Maeng et al. The bit error rate (BER) performance is evaluated by simulations. It is shown that the new STTC scheme always achieves better performance about 0.5~0.8 [㏈] at BER=10-3 than Tarokh's STTC scheme on fast Rayleigh or Rician fading channels.
느린 페이딩 채널에서 개선된 4-PSK 시공간 격자부호의 성능평가
진익수(Ik Soo Jin) 한국정보기술학회 2010 한국정보기술학회논문지 Vol.8 No.5
It is well known that the design parameters of space-time trellis code (STTC) in slow fading channels are different from those in fast fading channels. But, it is worthwhile to note that the design parameters in fast fading channels can also affect slightly the performance of STTC over slow fading channels provided that the design criteria in slow fading channels are satisfied and maximized. In this paper, we present a new 4-PSK (4-state) STTC with 2 transmit and one receive antennas for slow fading channels by improving the design parameters of the code. It is shown that the new code is superior to the conventional TSC or BBH code by 0.4~1.3 ㏈ at a BER of 10-4 over slow Rician fading channels. In addition, the performance of the new code with Gray mapping is also provided over slow Rayleigh or Rician fading channels.