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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 modulation for the data packets, where each encoded symbol consists of five bits. The primary drawback to JTIDS is the limited data rate. In this thesis, an alternative waveform consistent with the existing JTIDS channel waveform but with a two-fold increase in data rate is analyzed. The system to be  considered uses (31,15) RS encoding as in the original JTIDS, but each pair of five-bit symbols at the  output of the Reed-Solomon encoder undergo serial-to-parallel conversion to two five-bit symbols, which  are then independently transmitted on the in-phase and quadrature components of the carrier using 32-ary  biorthogonal keying with a diversity of two. The performance obtained with the alternative waveform is compared with that obtained for the existing JTIDS waveform for the relatively benign case where additive white Gaussian noise is the only noise present as well as when pulse-noise interference (PNI) is present.  Errors-and-erasures decoding as well as errors-only decoding is considered. Based on the analyses, we see that the proposed alternative JITDS/Link-16 waveform performs better in AWGN as well as when PNI is present. No significant advantage is obtained using EED for the alternative waveform. There is a significant improvement in performance when perfect-side information is assumed.
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<br>Subjects: Communications, Military; United States; Spread spectrum communications; Error-correcting codes (Information theory); Reed-Solomon codes; Signal detection</div>
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Cham, Kok Kiang</div>
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