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Frequency-hop spread spectrum with quadrature amplitude modulation and error-control coding

W.G. Phoel, J.A. Flursley, M.B. Pursley, J.S. Skinner
IEEE MILCOM 2004. Military Communications Conference, 2004.  

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As compared with binary or quatematy phase-ship keying, & ! -a y quadrature amplitude modulation (M-QAM) provides a greater spectral eficiency at a cost of u larger required signul-to-noise ratio to meet a spec$ed error rate. For frequency-hop spread-spectrum systems, proper use 'of error-cuntrol coding can decrease the signal-tonoise ratio requirement and also provide protection against partial-band inregerenee. We consider two classes of turbo codes for use in M-QAM frequency-hop spread
more » ... um: serially concatenated convolutional codes with iterative decoding and block product codes with iterative decoding. Pe$ormance comparisons clre given for I6-QAM with the two types of turbo codes and sof-decision metrics based on the log likelihood ratio. The per$omnce results for the turbo codes are compared with the pelformance of the IEEE 802. I I standard convolutional coding and Wterbi decoding for 16-QAM. An alternative soft-decision metric for Gray-coded Ad-QAM is developed and evaluated for each of the three coding systems.
doi:10.1109/milcom.2004.1494947 fatcat:wjx35fgip5gz3ohsur6fayy4xe
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W.G. Phoel, J.A. Flursley, M.B. Pursley, J.S. Skinner. "Frequency-hop spread spectrum with quadrature amplitude modulation and error-control coding." IEEE MILCOM 2004. Military Communications Conference, 2004.