Sb mlsc performs equivalently to mlsc however it is

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SB-MLSC performs equivalently to MLSC; however, it is easy to prototype SB-MLSC in the existing SDR software packages. 2 We implemented our single antenna contribution [ 9 ] using Ettus Universal Software Radio Peripheral (USRP) [ 25 ] and a combination of GNU Radio [ 26 ] and OpenAirInterface [ 27 ] SDR software packages. Further, we performed over-the-air (OTA) testing of our methods against standard compliant WiFi (IEEE 802.11g) frames being interfered by standard compliant ZigBee (IEEE 802.15.4) frames 3 . 3 We implemented our dual-antenna interference mitigation method for WiFi, i.e., SB-MLSC using USRP and a combination of GNU Radio and OpenAirInterface followed by OTA testing against standard compliant WiFi and ZigBee frames. Results of the OTA tests fall in close agreement with our simulation results showing the practical applicabil- ity of our proposed methods. All our proposed methods 3 We took the binary dump of WiFi and ZigBee frames generated by MATLAB and transmitted them using USRP SDR. The frames were detected by commercial WiFi and ZigBee nodes which established the standard compliance of the WiFi and ZigBee frames generated by MATLAB toolboxes
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Kumar et al. EURASIP Journal on Wireless Communications and Networking (2019) 2019:224 Page 5 of 21 for WiFi are also applicable to wideband OFDM-based systems which face co-channel narrowband interference. Additionally, the proposed signal processing methods and hardware implementations require modifications only on the receiver side and hence can be integrated into the existing infrastructure with minimal modifications. 1.4 Organization Section 2 discusses the necessary background and details of narrowband interference mitigating receiver architec- tures for WiFi which is based on our previous works on single- and multi-antenna WiFi receivers. Details of the proposed method in this work are presented in Section 3 . Section 4 presents the simulations of the proposed method and discussion on results. Section 5 details our SDR implementation and discusses over-the- air testing results. Finally, Section 6 summarizes our conclusions. 2 Receiver architectures for narrowband interference mitigation In this section, we present the details of our previous works related to interference mitigation in single- and multi-antenna WiFi receivers. We provide the neces- sary background for understanding our proposed method which is presented in Section 3 . 2.1 Interference mitigation in single-antenna WiFi receivers 2.1.1 Conventional noise variance estimation We first discuss the conventional way of computing the noise variance in a WiFi frame. A typical WiFi frame con- sisting of OFDM data symbols is preceded by preambles known as short training sequence (STS) and long training sequence (LTS) [ 28 ] as shown in Fig. 3 .
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