Parallel Detection Algorithm for Fast Frequency Hopping OFDM

• Published in: Frequenz Vol. 65; no. 3-4; pp. 87 - 91
• Main Authors: Kun, Xu, Xiao-xin, Yi
• Format: Journal Article
• Language: English
• Published: Walter de Gruyter GmbH & Co. KG 01.01.2011
• Subjects: Fast Frequency Hopping; Minimum Mean Square Error; OFDM; Parallel Detection; Parallel Interference Cancelation; QR Decomposition
• ISSN: 0016-1136; 2191-6349
• DOI: 10.1515/freq.2011.013

Fast frequency hopping OFDM (FFH-OFDM) exploits frequency diversity in one OFDM symbol to enhance conventional OFDM performance without using channel coding. Zero-forcing (ZF) and minimum mean square error (MMSE) equalization were first used to detect FFH-OFDM signal with a relatively poor bit error rate (BER) performance compared to QR-based detection algorithm. This paper proposes a parallel detection algorithm (PDA) to further improve the BER performance with parallel interference cancelation (PIC) based on MMSE criterion. Our proposed PDA not only improves the BER performance at high signal to noise ratio (SNR) regime but also possesses lower decoding delay property with respect to QR-based detection algorithm while maintaining comparable computation complexity. Simulation results indicate that at BER = 10–3 the PDA achieves 5 dB SNR gain over QR-based detection algorithm and more as SNR increases.