arXiv subjects

Rafik Zitouni

Publications and source records attributed to Rafik Zitouni.

4 recordsLinked to original sources

arXiv2026

Coexistence of 5G NR and Wi Fi 6E/7 at 6 GHz: Experimental Interference Measurements

This paper presents the first conducted-interference measurements of a commercial Very Low Power (VLP) Wi-Fi 6E/7 device into both the gNB uplink and UE downlink receiver chains of a live 5G New Radio (NR) system, using a complete O-RAN/SDR stack with 5G core in band~n102 (6\,GHz). We use a Software-Defined Radio (SDR) testbed built on OpenAirInterface with band~n102 support (40 MHz, 30 kHz Subcarrier Spacing). We sweep the injected Wi-Fi power and record throughput, block error rate, and signal-to-noise ratio on both the gNB uplink and UE downlink paths. Neither receiver shows measurable degradation below 75 dBm. Above this threshold, performance degrades progressively. The UE is more resilient at lower data rates and unaffected by beacon-only transmissions. A complementary link-budget analysis maps these measured thresholds to equivalent VLP-to-victim distances. These distances fall well inside the 545--685 Listen Before Talk (LBT) exclusion zone, confirming that a compliant VLP device would vacate the channel before its emissions could harm either receiver.

cs.NI↗

arXiv2020

Hardware-Software Codesign for Software Defined Radio: IEEE 802.11p receiver case study

Software Defined Radio (SDR) platforms are useful tools to design new wireless technologies or to improve specifications of existing ones. The IEEE 802.11p is the de-facto standard for Wireless Vehicular Ad-hoc NETworks (VANETs). It has been implemented on GNU Radio SDR [1], which experiences frames decoding/encoding latency. In this paper an FPGA based SDR is proposed as a solution to accelerate frame decoding of IEEE 802.11p waveforms. We share our experience in designing and validating an SDR on the top of real FPGA based embedded hardware architecture. On the top of an FPGA Zynq platform, we port an SDR GNU Radio following hardware/software (HW/SW) codesign approach. A real time profiling of the SDR system shows that the OFDM equalizer with FFT software function is the most time consuming task of the whole SDR receiver functions (34.74%). We suggest hardware acceleration of the FFT processing function using the free logic gates of the FPGA Zynq as a Hardware (HW) accelerator. The HW OFDM Equalizer with FFT sub-function could accelerate the SDR chain processing in comparison with a pure software implementation. Our FPGA based SDR design is a key step toward proposing an embedded SDR. It would be an alternative for not only the IEEE 802.11p standard but for any OFDM based SDR.

eess.SP↗

arXiv2015

A Dynamic Spectrum Access on SDR for IEEE 802.15.4 networks

Our paper deals with a Dynamic Spectrum Access (DSA) and its implementation on a Software Defined Radio (SDR) for IEEE 802.15.4e Networks. The network nodes select the carrier frequency after Energy-Detection based Spectrum Sensing (SS). To ensure frequency hoping between two nodes in IEEE 802.15.4e Network, we propose a synchronization algorithm. We considerate the IEEE 802.15.4e Network is Secondary User (SU), and all other networks are Primary Users (PUs) in unlicensed 868/915 MHz and 2450 MHz bands of a Cognitive Radio (CR). However, the algorithm and the energy-sensor have been implemented over GNU Radio and Universal Software Radio Peripheral (USRP) SDR. In addition, real packet transmissions have been performed in two cases. In the first case, SU communicates in static carrier-frequency, while in the second case with the implemented DSA. For each case, PU transmitter disturbs SU, which calculates Packet Success Rate (PSR) to measure the robustness of a used DSA. The obtained PSR is improved by 80\% when the SU accomplished DSA rather than a static access.

cs.NI↗

arXiv2013

IEEE 802.15.4 transceiver for the 868/915 MHz band using Software Defined Radio

This paper reports an implementation of the PHY specifications of the IEEE 802.15.4 standard for the frequency band 868 915 MHz on a Software Defined Radio (SDR) platform. This standard is defined for low power, low data rate and low cost wireless networks. These specifications are used by the Zigbee technology for various applications such as home automation, industry monitoring or medical surveillance. Several hardware PHY 868/915 MHz band IEEE 802.15.4 transceiver implementations have been already reported on ASIC and FPG [1] [2]. SDR offers one possibility to realize a transceiver with high flexibility and reconfigurability [3]. The whole transmitter and receiver chain has been defined in software using the GNU Radio software project [4] and the USRP (Universal Software Radio Peripheral) platform from Ettus Research [5]. Two new blocks have been added to the GNU Radio project, one for the Direct Sequence Spread Spectrum and the second for the reconstruction of the packets. The experimentations have been performed in a noisy environment and the PER, BER and SNR have been computed. The obtained results are coherent with what can be expected from the theory.

cs.NI↗