2024/02/19 by Riccardo Schiavone, Schiavone, Riccardo, Gianluigi Liva +3 · 1 citation
Engineering · #FOS: Computer and information sciences #Information Theory (cs.IT) #IoT Networks and Protocols #IoT-based Smart Home Systems #Wireless Body Area Networks
paper · pdf · doi:10.48550/arxiv.2402.12101
openalex publication_date 2024/02/19 · openalex created_date 2024/02/21 · openalex updated_date 2026/07/28
We analyze the performance of enhanced spread spectrum Aloha (E-SSA) in the framework of unsourced multiple access (UMAC). The asynchronous, unframed transmission of E-SSA is modified to enable a direct comparison with framed UMAC schemes and with Polyanskiy's achievability bound. The design of E-SSA is tailored to the UMAC setting, resorting to short polar codes and the use of a timing channel to improve the energy efficiency of the protocol. We assess the impact of the preamble length and of the spreading factor on the system efficiency. The resulting scheme exhibits simplicity at the transmitter and linear complexity with respect to the number of active users at the receiver, approaching the UMAC achievability bound in close competition with the best known UMAC schemes.