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<p>The Joint Tactical Information Distribution System (JTIDS) is a hybrid frequency-hopped, direct sequence spread spectrum system that utilizes a (31, 15) Reed-Solomon (RS) code and cyclical code-shift keying (CCSK) modulation for the data  packets, where each encoded symbol consists of five bits. In this thesis, an alternative waveform consistent with the existing  JTIDS channel waveform is analyzed. The system to be considered uses (31, 15) RS encoding as the original JTIDS, but each  pair of five-bit symbols at the output of the RS encoder undergo serial-to-parallel conversion to two five-bit symbols, which are  then independently transmitted on the in-phase (I) and quadrature (Q) component of the carrier using 32-ary orthogonal  signaling with 32 chip baseband waveforms such as Walsh functions. This system is consistent with the direct sequence  waveform generated by JTIDS. The performance obtained with alternative waveform is compared with that obtained with the  existing JTIDS waveform for the relatively benign case where additive white Gaussian noise (AWGN) is the only noise present  as well as when pulse-noise interference (PNI) is present. Errors-and-erasures decoding (EED) as well as errors only decoding  is also considered. Based on the analyses, we conclude that the proposed alternative Link-16/JTIDS compatible waveform  performs better than the existing Link-16/JTIDS waveform in AWGN as well as when PNI is present for both coherent and  noncoherent demodulation. No significant advantage is obtained by using errors-and-erasures decoding (EED) for the  alternative Link-16/JTIDS compatible waveform.
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<br>Subjects: Spread spectrum communications; Reed-Solomon codes; Random noise theory; Time division multiple access</div>
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Lekkakos, Dimitrios.</div>
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