Daniel J. J. Versfeld

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Narrowband interference can cause undetected errors when M-FSK data is encoded with an algebraic code containing the all-<i>e</i> codewords. This is due to the fact that the narrowband interferer will cause the output of the M-FSK demodulator to correspond to one of the all- <i>e</i> codewords. One possible solution is to use a coset code of a code(More)
Reliability information derived from the channel output in the form of a Log Likelihood Ratio or a Distance Metric (DM) have been proposed in literature for M-ary Quadrature Amplitude Modulation systems. Reliable soft information from the channel output improves the performance of the forward error correction decoding algorithm. This paper proposes an(More)
Free-space optical communication with spatial modes of light has become topical due to the possibility of dramatically increasing communication bandwidth via Mode Division Multiplexing (MDM). While both scalar and vector vortex modes have been used as transmission bases, it has been suggested that the latter is more robust in turbulence. Using orbital(More)
We derive a simple formula to generate a wide-sense systematic generator matrix <i>B</i> for a Reed-Solomon code. Specifically, we generate the generator matrix <i>B</i> such that the columns with indices ¿<sub>1</sub>, ¿<sub>2</sub>,..., ¿<i>k</i> are the columns of the identity matrix <i>Ik</i>. One possible application of these wide-sense matrices is(More)
A low-complexity iterative channel estimation and Reed–Solomon (RS) decoding receiver is developed. The joint channel estimation and decoding receiver is based on the linear minimum mean square error (LMMSE) channel estimation technique and the recently proposed RS parity-check transformation algorithm (PTA). A key feature of this joint receiver is the(More)
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