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Openwifi : a free and open-source IEEE802.11 SDR implementation on SoC

Xianjun Jiao (UGent) , Wei Liu (UGent) , Michael Mehari (UGent) , Muhammad Aslam (UGent) and Ingrid Moerman (UGent)
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Abstract
Open source Software Defined Radio (SDR) project, such as srsLTE and Open Air Interface (OAI), has been widely used for 4G/5G research. However the SDR implementation of the IEEE802.11 (Wi-Fi) is still difficult. The Wi-Fi Short InterFrame Space (SIFS) requires acknowledgement (ACK) packet being sent out in 10μs/16μs(2.4 GHz/5GHz) after receiving a packet successfully, thus the Personal Computer (PC) based SDR architecture hardly can be used due to the latency (≥100μs) between PC and Radio Frequency (RF) front-end. Researchers have to do simulation, hack a commercial chip or buy an expensive reference design to test their ideas. To change this situation, we have developed an open-source full-stack IEEE802.11a/g/n SDR implementation — openwifi. It is based on Xilinx Zynq Systemon-Chip (SoC) that includes Field Programmable Gate Array (FPGA) and ARM processor. With the low latency connection between FPGA and RF front-end, the most critical SIFS timing is achieved by implementing Physical layer (PHY) and low level Media Access Control (low MAC) in FPGA. The corresponding driver is implemented in the embedded Linux running on the ARM processor. The driver instantiates Application Programming Interfaces (APIs) defined by Linux mac80211 subsystem, which is widely used for most SoftMAC Wi-Fi chips. Researchers could study and modify openwifi easily thanks to the modular design. Compared to PC based SDR, the SoC is also a better choice for portable and embedded scenarios

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MLA
Jiao, Xianjun, et al. “Openwifi : A Free and Open-Source IEEE802.11 SDR Implementation on SoC.” 2020 IEEE 91st Vehicular Technology Conference (VTC2020-Spring), IEEE, 2020, doi:10.1109/VTC2020-Spring48590.2020.9128614.
APA
Jiao, X., Liu, W., Mehari, M., Aslam, M., & Moerman, I. (2020). Openwifi : a free and open-source IEEE802.11 SDR implementation on SoC. In 2020 IEEE 91st Vehicular Technology Conference (VTC2020-Spring). Antwerpen, Belgium: IEEE. https://doi.org/10.1109/VTC2020-Spring48590.2020.9128614
Chicago author-date
Jiao, Xianjun, Wei Liu, Michael Mehari, Muhammad Aslam, and Ingrid Moerman. 2020. “Openwifi : A Free and Open-Source IEEE802.11 SDR Implementation on SoC.” In 2020 IEEE 91st Vehicular Technology Conference (VTC2020-Spring). IEEE. https://doi.org/10.1109/VTC2020-Spring48590.2020.9128614.
Chicago author-date (all authors)
Jiao, Xianjun, Wei Liu, Michael Mehari, Muhammad Aslam, and Ingrid Moerman. 2020. “Openwifi : A Free and Open-Source IEEE802.11 SDR Implementation on SoC.” In 2020 IEEE 91st Vehicular Technology Conference (VTC2020-Spring). IEEE. doi:10.1109/VTC2020-Spring48590.2020.9128614.
Vancouver
1.
Jiao X, Liu W, Mehari M, Aslam M, Moerman I. Openwifi : a free and open-source IEEE802.11 SDR implementation on SoC. In: 2020 IEEE 91st Vehicular Technology Conference (VTC2020-Spring). IEEE; 2020.
IEEE
[1]
X. Jiao, W. Liu, M. Mehari, M. Aslam, and I. Moerman, “Openwifi : a free and open-source IEEE802.11 SDR implementation on SoC,” in 2020 IEEE 91st Vehicular Technology Conference (VTC2020-Spring), Antwerpen, Belgium, 2020.
@inproceedings{8663043,
  abstract     = {Open source Software Defined Radio (SDR) project, such as srsLTE and Open Air Interface (OAI), has been widely used for 4G/5G research. However the SDR implementation of the IEEE802.11 (Wi-Fi) is still difficult. The Wi-Fi Short InterFrame Space (SIFS) requires acknowledgement (ACK) packet being sent out in 10μs/16μs(2.4 GHz/5GHz) after receiving a packet successfully, thus the Personal Computer (PC) based SDR architecture hardly can be used due to the latency (≥100μs) between PC and Radio Frequency (RF) front-end. Researchers have to do simulation, hack a commercial chip or buy an expensive reference design to test their ideas. To change this situation, we have developed an open-source full-stack IEEE802.11a/g/n SDR implementation — openwifi. It is based on Xilinx Zynq Systemon-Chip (SoC) that includes Field Programmable Gate Array (FPGA) and ARM processor. With the low latency connection between FPGA and RF front-end, the most critical SIFS timing is achieved by implementing Physical layer (PHY) and low level Media Access Control (low MAC) in FPGA. The corresponding driver is implemented in the embedded Linux running on the ARM processor. The driver instantiates Application Programming Interfaces (APIs) defined by Linux mac80211 subsystem, which is widely used for most SoftMAC Wi-Fi chips. Researchers could study and modify openwifi easily thanks to the modular design. Compared to PC based SDR, the SoC is also a better choice for portable and embedded scenarios},
  author       = {Jiao, Xianjun and Liu, Wei and Mehari, Michael and Aslam, Muhammad and Moerman, Ingrid},
  booktitle    = {2020 IEEE 91st Vehicular Technology Conference (VTC2020-Spring)},
  isbn         = {9781728152073},
  issn         = {1090-3038},
  language     = {eng},
  location     = {Antwerpen, Belgium},
  pages        = {2},
  publisher    = {IEEE},
  title        = {Openwifi : a free and open-source IEEE802.11 SDR implementation on SoC},
  url          = {http://dx.doi.org/10.1109/VTC2020-Spring48590.2020.9128614},
  year         = {2020},
}

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