arXiv subjects

Hatef Nouri

Publications and source records attributed to Hatef Nouri.

2 recordsLinked to original sources

arXiv2026

Demonstration of a 1.2 Gbps Always-on Fully-Connected Mesh Network with RFSoC SDRs

We design and implement on Radio Frequency System-on-Chip (RFSoC) software-defined radios (SDRs) a complete-graph network of four unmanned aerial vehicles and demonstrate real-time 4K video streaming over twelve always-on 2x2 multiple-input multiple-output (MIMO) links. The testbed operates at an aggregate network throughput of approximately 1.2 Gbps (i.e., 12 links of 99.84 Mbps) across a shared bandwidth of 200 MHz. To the best of our knowledge, this is the first demonstration of low-latency digitally controlled frequency-division duplex (FDD) RFSoC-based MIMO wireless links capable of simultaneously supporting multiple real-time, uncompressed 4K video streams. The testbed consists of four AMD/Xilinx Zynq UltraScale+ RFSoC ZCU111 evaluation kits configured as a fully-connected mesh network with custom-built physical and medium-access-control layers, adaptive equalization, and adjacent-band filtering implemented entirely in RFSoC's programmable logic. A host-side graphical user interface (GUI) provides real-time visualization of each link's performance including error vector magnitude (EVM), pre-detection signal-to-interference-plus-noise ratio (SINR), and bit error rate (BER), and enables dynamic reconfiguration of link parameters during operation.

cs.NI↗

arXiv2025

Spectrum Sharing by Space-Time Waveform Shaping

In this paper, we consider the task of introducing a new wireless data link over a given occupied frequency band using a multi-antenna transmitter and receiver. We design formally a dynamic multiple-input multiple-output (MIMO) wireless link that can coexist in the fixed congested frequency band by (a) optimally avoiding sensed interference in the joint space-time domain, and (b) protecting existing links by minimizing its own transmitted power in the band. In particular, the transmit beam weight vector and time domain pulse code sequence are jointly optimized to minimize the transmit energy per bit per antenna, while maintaining a pre-defined signal-to-interference-plus-noise ratio (SINR) at the output of the joint space-time maximum SINR receiver filter. Extensive numerical studies are carried out to demonstrate the derived algorithmic solution in light and heavily congested band scenarios with non-cooperative co-channel links. We show that the proposed autonomously reconfigurable 4x4 MIMO link outperforms a non-adaptive transceiver and other forms of waveform shaping in terms of the pre-detection SINR performance and the capability to protect ongoing non-cooperative links by not occupying the band with redundant transmissions.

cs.NI↗