Real Signal Equalization for OQAM

TL;DR

This paper introduces a real-only equalizer (ROE) for OQAM signals, demonstrating its performance equivalence to the widely linear equalizer (WLE) while offering lower computational complexity, especially in adaptive implementations.

Contribution

The paper proposes and analyzes a real-only equalizer (ROE) for OQAM, showing its performance matches WLE with reduced complexity in certain scenarios.

Findings

ROE and WLE produce equivalent outputs for the same fading channel.

ROE can be computationally less complex than WLE depending on frame length.

In adaptive LMS implementation, ROE outperforms WLE with lower complexity for given pilot bits.

Abstract

This correspondence proposes the use of a real-only equalizer (ROE), which acts on real signals derived from the received offset quadrature amplitude modulation (OQAM) symbols. For the same fading channel, we prove that both ROE and the widely linear equalizer (WLE) yield equivalent outputs. Hence, these exhibit the same performance. Our complexity analysis finds that depending on the frame length, ROE can be computationally less complex, and save significant signal processing time over WLE. In the adaptive normalized least mean square implementation, ROE performs better with lower complexity than its counterpart, for a given number of pilot bits.