Adaptive quantization for spectrum exchange information in mobile cognitive radio networks

• Main Authors: Arief Marwanto, Arief Marwanto, Syed Yusof, Sharifah Kamilah, Satria, Muhammad Haikal
• Format: Article
• Language: English
• Published: Institute of Advanced Engineering and Science 2020
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://eprints.utm.my/id/eprint/91104/1/SharifahKamilahSyedYusof2020_AdaptiveQuantizationforSpectrumExchangeInformation.pdf; http://eprints.utm.my/id/eprint/91104/; http://dx.doi.org/10.11591/ijece.v10i4.pp3605-3614

To reduce the detection failure of the exchanging signal power onto the OFDM subcarrier signal at uniform quantization, dynamic subcarrier mapping is applied. Moreover, to addressing low SNR’s wall less than predetermine threshold, non-uniform quantization or adaptive quantization for the signal quantization size parameter is proposed. μ-law is adopted for adaptive quantization subcarrier mapping which is deployed in mobility environment, such as Doppler Effect and Rayleigh Fading propagation. In this works, sensing node received signal power then sampled into a different polarity positive and negative in μ-law quantization and divided into several segmentation levels. Each segmentation levels are divided into several sub-segment has representing one tone signal subcarrier number OFDM which has the number of quantization level and the width power. The results show that by using both methods, a significant difference is obtained around 8 dB compared to those not using the adaptive method.