# Intersymbol and Intercarrier Interference in OFDM Transmissions through Highly Dispersive Channels

## TL;DR

This paper quantifies intersymbol and intercarrier interference in OFDM systems over highly dispersive channels, revealing significant impacts on achievable data rates and challenging conventional interference assumptions.

## Contribution

It provides the first quantitative analysis of interference effects in OFDM with highly dispersive channels and derives data rate bounds based on actual interference calculations.

## Key findings

- Interference effects are more severe than traditional models suggest.
- Achievable data rates are significantly affected by channel dispersion.
- Conventional interference assumptions underestimate the impact of dispersive channels.

## Abstract

This work quantifies, for the first time, intersymbol and intercarrier interferences induced by very dispersive channels in OFDM systems. The resulting achievable data rate for \wam{suboptimal} OFDM transmissions is derived based on the computation of signal-to-interference-plus-noise ratio for arbitrary length finite duration channel impulse responses. Simulation results point to significant differences between data rates obtained via conventional formulations, for which interferences are supposed to be limited to two or three blocks, versus the data rates considering the actual channel dispersion.