412 results the results of experiment 1section 411

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4.1.2 Results The results of experiment 1(Section 4.1.1 ) are plotted in Fig. 10 (single interferer), Fig. 11 (two overlapped interferers), Fig. 12 (two interferers) and Fig. 13 (four interferers) for MCS 0 and MCS 2. Fig. 9 Block diagram of SB-MLSC for 2-antenna WiFi receiver
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Kumar et al. EURASIP Journal on Wireless Communications and Networking (2019) 2019:224 Page 11 of 21 Fig. 10 LNV-SC vs Conv-SC for single-antenna WiFi receiver in the presence of single interferer. LNV-SC achieves more gain in SNR compared to Conv-SC for all the WiFi MCS First of all, we observe that WiFi PER significantly degrades in the presence of single/multiple ZigBee inter- ferers for all the WiFi MCS. Next, we observe that LNV-SC (LLR scaling with LNV estimates) achieves 10% PER mark at a lower WiFi TXP compared to the Conv-SC (conventional method) for both the WiFi MCS. Thus, our method lowers the SNR requirement in the presence of interference compared to the conven- tional method. However, for the case when the inter- ference is caused by two ZigBee interferers, we observe that LNV-SC fails to provide any gain over Conv- SC. The reason being excessive noise over the affected Fig. 11 LNV-SC vs Conv-SC for a single-antenna WiFi receiver in the presence of two fully overlapped narrowband interferers (both at - 85 dBm TxP). LNV-SC fails to provide SNR gain in comparison to Conv-SC
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Kumar et al. EURASIP Journal on Wireless Communications and Networking (2019) 2019:224 Page 12 of 21 Fig. 12 LNV-SC vs Conv-SC for a single-antenna WiFi receiver in the presence of two narrowband interferers. LNV-SC achieves more gain in SNR compared to Conv-SC for all the WiFi MCS, although the gain decreases as the MCS increases subcarriers to the extent that the LLRs are damaged beyond repair by performing LLR scaling with LNV estimates. The gain in SNR with our method for MCS 0, 2, 4, and 6 is summarized in Table 2 . From Table 2 , we observe that the gain in SNR monotonically decreases as the number of interferers increase. Because, as the number of ZigBee channels increase, more WiFi subcarriers get affected which decreases the difference between noise variance estimates calculated using Eqs. 2 and 4 . Additionally, received Zig- Bee power does not decay steeply outside 2-MHz band leading to the amplification of noise in more than 7 Fig. 13 LNV-SC vs Conv-SC for single-antenna WiFi receiver in the presence of four interferers. LNV-SC achieves more gain in SNR compared to Conv-SC for all the WiFi MCS
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Kumar et al. EURASIP Journal on Wireless Communications and Networking (2019) 2019:224 Page 13 of 21 Table 2 SNR gain (dB) WiFi MCS 0 2 4 6 No. of interferers 1 6.2 5.8 5.3 6.5 2 5.3 5.4 5.3 5.4 4 2 2.1 2.3 2.1 subcarriers. We also observe that the gain in SNR is more-or-less consistent throughout the WiFi MCS for a given number of interferers. The reason behind this is the fixed payload size of WiFi (1000 bytes) which we used for all the WiFi MCS during the simulations leading to an equal number of LLRs that got affected for all the WiFi MCS.
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