Frequency Reversal Alamouti Code-Based FBMC with Resilience to Inter-Antenna Frequency Offsets

TL;DR

This paper introduces a novel FRAC-based transmit scheme for FBMC that inherently cancels inter-antenna interference caused by frequency offsets, maintaining diversity and performance in frequency-selective channels.

Contribution

It proposes a new FRAC-based transmit scheme for FBMC that is resilient to inter-antenna frequency offsets and applicable in frequency-selective channels.

Findings

Negligible BER degradation under significant IAFOs

Inherent cancellation of inter-antenna inter-carrier interference

Preserves spatial diversity in frequency-selective channels

Abstract

Transmit diversity schemes for filter bank multicarrier (FBMC) are known to be challenging. No existing schemes have considered the presence of inter-antenna frequency offset (IAFO), which will result in performance degradation. In this letter, a new transmit scheme based on the frequency reversal Alamouti code (FRAC)-based structure to address the issue of IAFO is proposed and is proven to inherently cancel the inter-antenna inter-carrier interference (ICI) while preserving spatial diversity. Moreover, the proposed FRAC structure is applicable in frequency-selective channels. Numerical results show that the proposed scheme undergoes negligible bit error rate (BER) degradation even with considerable IAFOs.