Better Utilisation of Radio Spectrum with Cognitive Radio

Dr Arun Kumar and Nandha Kumar P. are assistant professors in Department of ECE, JECRC University, Jaipur

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Pd vs SNR for OFDM with and without CP
Fig. 4: Pd vs SNR for OFDM with and without CP

Pd vs SNR for OFDM with filter at transmitter and receiver. Pd vs SNR plots for an OFDM system with a filter at the transmitter, and an OFDM system with a filter at both the transmitter and the receiver, are shown in Fig. 5. Pd increases with the increase of SNR. OFDM system with a filter at the transmitter is capable of detection for smaller SNRs, whereas OFDM system with a filter at both the transmitter and the receiver needs a high SNR for detection.

Pd vs SNR for OFDM with filter at transmitter and receiver
Fig. 5: Pd vs SNR for OFDM with filter at transmitter and receiver

Pd vs Pfa for OFDM with and without CP. Analysis of Pd vs Pfa for OFDM with and without CP is shown in Fig. 6. Pd increases with the increase of Pfa. For OFDM with CP the probability of missed detection is higher, even for lower Pfa, whereas for OFDM without CP the Pfa requirement is more for missed detection, which means the effect of Pfa in OFDM without CP is less than in OFDM with CP.

Pd vs Pfa for OFDM with and without CP
Fig. 6: Pd vs Pfa for OFDM with and without CP

Pd vs Pfa for OFDM with filter at transmitter and receiver. Analysis of Pd vs Pfa for OFDM with filter at transmitter and receiver both is shown in Fig. 7. OFDM with filter at transmitter shows a better performance than OFDM with filter at both transmitter and receiver.

Pd vs Pfa for OFDM with filter at transmitter and receiver
Fig. 7: Pd vs Pfa for OFDM with filter at transmitter and receiver

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