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.
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 |