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Table 1 Required SNR values of known channel and sample covariance-based approaches for the BER = 0.01 in QPSK BS-CR systems for SIR values of {− 0, − 20, − 30} dB considering block fading channel (no-mobility) with silent gap lengths of 8, 16, 32 and 128 symbols, and OFDM frame length of 17 symbols.

From: Enhanced interpolation-based interference rejection combining for black-space cognitive radio in time-varying channels

Req. SNR for BER = 0.01 SIR = − 30 dB SIR= − 20 dB SIR = − 10 dB
Known Chn. (dB) Sample Cov. (dB) Known Chn. (dB) Sample Cov. (dB) Known Chn. (dB) Sample Cov. (dB)
Gap = 8 7.9 12.3 7.9 12.3 7.9 12.2
Gap = 16 7.9 9.8 7.9 9.8 7.9 9.7
Gap = 32 7.9 8.9 7. 9 8.9 7.9 8.8
Gap = 128 8.0 8.3 8.0 8.3 8.0 8.2