• International Journal of Computer Science & Network Security
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• 제24권3호
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• pp.182-188
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• 2024

Hardware components are an integral part of Hardware Define Radio (HDR) for seamless operations and optimal performance. On the other hand, Software Define Radio (SDR) is a program that does not rely on any hardware components for its performance. Both of the latter radio programmers utilize modulation functions to make their core components from signal processing viewpoint. The following paper concentrates on SDR based modulation and their performance under different modulations. The bit error rate (BER) of modulations such as PSK, QAM, and PSAM were used as indicators to test channel quality estimation in planar Rayleigh fading. Though it is not commonly used for channel fading, the method of the adder determines the regionally segmented channel fading. Thus, the estimation error of the channel change substantially reduces the performance of the signal, hence, proving to be an effective option. Moreover, this paper also elaborates that BER is calculated as a function of the sample size (signal length) with an average of 20 decibels. Consequently, the size of the results for different modulation schemes has been explored. The analytical results through derivations have been verified through computer simulation. The results focused on parameters of amplitude estimation error for 1dB reduction in the average signal-to-noise ratio, while the combined amplitude deviation estimation error results are obtained for a 3.5 dB reduction

• 한국정보통신학회논문지
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• 제15권8호
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• pp.1687-1694
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• 2011

본 논문에서는 OFDM 기반의 WLAN을 지원하는 Digital IF 단을 설계하고 시뮬레이션을 통해서 시스템 성능을 조사한다. 이를 위해서 ADC 샘플률, NCO 주파수 및 데시메이션률 결정과정을 보이고 주워진 데시메이션률을 얻기 위한 CIC필터 및 MHBF 설계과정을 제시한다. 데시메이션 과정에서 발생되는 진폭왜곡 보상을 위해 시스템 복잡도를 최소화하면서 요구성능을 만족시키는 ISOP 필터 및 FIR 필터를 설계하는 과정을 제시한다. 최종적으로 설계된 DDC 블록에 대해서 BER 관점으로 성능을 조사한 후 이론적인 변복조 시스템과의 성능 차이를 보인다.