Differential space frequency COFDM for a multipath fading channel

Fred C. Kellerman

doi:10.1117/12.604627

2 June 2005 Differential space frequency COFDM for a multipath fading channel

Fred C. Kellerman

Proceedings Volume 5819, Digital Wireless Communications VII and Space Communication Technologies; (2005) https://doi.org/10.1117/12.604627
Event: Defense and Security, 2005, Orlando, Florida, United States

Abstract

This paper will investigate the performance of a dual transmit antenna, single receive antenna, Alamouti differential Space Frequency (SF) Coded Orthogonal Frequency Division Multiplexed (COFDM) system on a multipath fading High Frequency (HF) radio channel. Prior work demonstrated that the multi-antenna Alamouti system without forward error correction did not perform as well on the HF Channel as a novel uncoded single antenna Code Division Multiple Access (CDMA) system. By adding additional convolutional or Low Density Parity Check (LDPC) error correction coding, the Bit Error Rate (BER) performance will be shown to improve and exceed that of a similar single antenna COFDM differential system. Numerical results will be shown for the CCIR poor (2ms, 1Hz) and extra poor (2ms, 2Hz) channel conditions for both a constraint length 7 convolutional code and a 7680 block length regular LDPC code. BER behavior for the SF-COFDM system will be plotted as a function of channel fade rate and interleaver size. BER comparisons will also be made between the coded system and a coded single transmit and receive antenna HF COFDM CDMA scheme.

Citation Download Citation

Fred C. Kellerman "Differential space frequency COFDM for a multipath fading channel", Proc. SPIE 5819, Digital Wireless Communications VII and Space Communication Technologies, (2 June 2005); https://doi.org/10.1117/12.604627

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