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Iterative Interference Suppression and Decoding in DS/FH Spread-Spectrum Systems
Antonia M. TULINO Ezio M. BIGLIERI Savo GLISIC
IEICE TRANSACTIONS on Communications
Publication Date: 2000/08/25
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Issue on Personal, Indoor and Mobile Radio Communications)
spread spectrum, frequency hopping, interference suppression, turbo decoding,
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We examine the detection of coded hybrid direct-sequence frequency-hopped spread-spectrum signals in the presence of narrowband interference. Since blind interference suppression requires a reliable estimate of the data, while at the same time data decoding requires interference suppression, we advocate an iterative ("turbo") detection scheme whereby information is exchanged between the interference suppressor and the soft-input soft-output decoder. Several suppression schemes are examined and compared. Simulation results show that this new scheme is robust, i.e., exhibits good performance under a modicum of assumptions on the interference structure. Turbo codes and convolutional codes are compared, showing that the former perform better.