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톤간섭 및 다중간섭하에서 제반 디지탈 변조신호의 오율특성 비교
공병옥,조성준 한국통신학회 1990 韓國通信學會論文誌 Vol.15 No.10
The error rate equations of digitally modulated signals transmitted through the Gaussian noise and tone multiple interference channel have been derived. Using the derived equations of error probabilities in the environments of Gaussian noise tone interferer and Gaussian noise multiple interferer, the error rate performances of various digitally modulated signals have been evaluated, and compared in graphs as a function of average carrier to tone interferer power ratio(CIR), average carrier to multiple interferer power ratio(CIT) and the average carrer-to-Gaussian noise powr ratio(CIR). In this paper, the modulation schemes such as amplitude shift keying (ASK), phase shift keying(PSK), frequency shift keying(FSK), minimum shift keying(MSK), quadrature amplitud modulation(QAM) and amplitude phase shift keying(APK) have been selected for the study of performance comparison. The results of comparison show us that, in low bits/sec/Hz, PSK is superior to the other schemes, but in high bits/sec/Hz, mixed multi ary type is better than single multi ary type. And in strong noise evironment, the multiple interferer has much influence than tone interferer, however, in low noise environment. the mojor error factor is tone interferer. But tone interference effect nearly disappears over specified CIR level about 20[dB]. And the modulation schemes using amplitude are heavily influenced by multiple interference.
가우스雜音과 다중파 干涉環境下에서 채널 符號 技法을 利用한 諸般 디지탈 變調信號의 誤率特性
孔炳玉,趙成俊 한국항공대학교 1990 論文集 Vol.28 No.-
본 논문에서는 가우스잡음환경하에서 다중파간섭의 영향을 받는 디지탈 변조신호의 오율특성을 개선하는 방법으로서 채널부호기법을 도입하여 해석하였다. 유도된 오율식으로 부터 평균 신호전력 대 잡음전력의 비(??), 평균 신호전력 대 다중간섭파 전력의 비(??)를 파라메터로 하여 수치계산한 다음 오율그래프로 나타내어 그 결과를 비교, 검토하였다. 비교대상의 디지탈 변조방식으로서 진폭편이변조(ASK), 위상편이변조(PSK), 주파수편이변조(FSK), 최소주파수편이변조(MSK), 직교진폭변조(QAM) 및 진폭위상변조(APK)를 택하였다. 검토한 결과, (8, 4) 해밍부호기법의 도입에 의해 CNR이 약 3[dB] 정도 개선되며 (4, 5) 상관부호 기법의 도입시에는 약 6[dB] 개선된다. 또한 다치화되거나 간섭파의 레벨이 높을 때(낮은 CIR) 개선도는 증가하며 에러가 많은 경우(??)에는 채널 부호기법을 도입하더라도 오율특성은 개선되지 않는다. The error rate performances of digitally modulated signlas transmitted through the Gaussian noise and multiple interference channel have been analyzed with channel coding techniques such as hamming code and convolution code. Using the derived equations of error probabilities in the environments of Gaussian noise and multiple interferer, the error rate performances of various digitally modulated signlas have been evaluated, and compared in graphs as a function of average carrier-to-multiple interferer power ratio(??) and the average carrier-to-Gaussian noise power ratio(??). In this paper, the modulation schemes such as amplitude shift keying(ASK), phase shift keying(PSK), frequency shift keying(FSK), minimum shift keying(MSK), quadrature amplitude modulation(QAM) and amplitude phase shift keying(APK) have been selected for the study of performance improvement and comparison. The results of comparison show us that, the CNR performances have been improved about 3 [dB] by (8, 4) hamming code, and about 6[dB] by (4, 5) convolution code. And the error performance inprovement increases in multi-ary type or in low CIR.