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조성언,박기식,홍희식 順天大學校 1999 論文集 Vol.18 No.1
In this paper, we have analyzed and simulated the BER and CLP of Wireless ATM(WATM) cells adopting the concatenated FEC technique in Rician fading channel. Also, in Rician fading channel, we have contrived the performance improvement by introducing the fading compensation technique of inserting pilot symbols into the concatenated FEC. From the results, in Rician fading channel, it is known that since the superior BER performance in low ?? results in the divergence when the Viterbi decoder is conducted first, the performance difference of about 2 [dB] occurs between the theory analysis and the simulation. Besides, from the only simulation results, it is known that the system performance adopting the concatenated FEC technique by inserting pilot symbols is improved about 1 [dB] better in terms of ?? than the system performance adopting the only concatenated FEC technique.
강희창,홍희식 서울産業大學校 1994 논문집 Vol.40 No.1
본 논문에서는 multi-h CPM 신호의 차동 검파 방식을 제안하고 이에 적합한 변조 지수 집합을 도출하였다. 여러 종류의 변조 지수 집합을 갖는 Multi-h CPM 신호의 전력 스펙트럼을 MSK 나 QPSK 등의 경우와 비교하였고 2-h CPM 과 3-h CPM 신호에 대한 일반적인 차동 검파기의 오율 성능 및 비터비 앨고리듬을 이용한 차동 검파기의 오율 성능을 비교 분석하였다. In this paper, the differential detection technique of multi-h CPM is introduced and described. We derived the sets of modulation index of multi-h phase codes adequate to the differential detection. The power spectra of multi-h signals with various sets of modulation index are presented and compared to those of MSK and QPSK. Error rate performances of the conventional detector and Viterbi algorithm detector of 2-h and 3-h CPM are evaluated and compared.