Abstract
The transmission of one-hundred-femtosecond-long pulses by following an ON-OFF keying modulation spread in time has been proposed as a way to enable Terahertz (THz)-band (0.1-10 THz) communications over short distances. Such modulation minimizes the probability of collisions due to the very small time that the channel is occupied by a user. However, given that many of the envisioned applications involve very large node densities, multi-user interference becomes unavoidable. In this paper, a stochastic model of multi-user interference is developed and experimentally validated. The model takes into account the fact that the interference power at the receiver is not a combination of the received powers from the individual nodes, but the power of the combination of the received signal amplitudes. For this, first, a mathematical framework is developed to compute the probability density function (PDF) of the interference generated by one interfering node at the receiver, starting from the PDFs of the pulse received energy and the PDF of the pulse shape. Then, the model is extended to account for multiple nodes which can constructively or destructively interfere. The developed model is experimentally validated by means of an innovative setup and the extensive numerical results are provided to analyze the trends of multi-user interference in pulse-based THz communications.
| Original language | English (US) |
|---|---|
| Article number | 2920965 |
| Pages (from-to) | 4103-4115 |
| Number of pages | 13 |
| Journal | IEEE Transactions on Wireless Communications |
| Volume | 18 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 2019 |
All Science Journal Classification (ASJC) codes
- Computer Science Applications
- Electrical and Electronic Engineering
- Applied Mathematics
Keywords
- Experimental characterization
- Multiple access interference
- Pulse modulation
- Stochastic processes
- Terahertz communications