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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  waveform but with twice the data rate is analyzed. The system to be considered also uses  (31, 15) RS encoding, but each pair of five-bit symbols at the output of the RS encoder  undergoes serial-to-parallel conversion to two five-bit symbols, which are then  independently transmitted on the in-phase and quadrature component of the carrier using  32-ary orthogonal signals with a diversity of two. In this thesis, only coherent detection is  considered. The performance obtained with the alternative JTIDS waveform is compared  with the existing JTIDS waveform when only additive white Gaussian noise (AWGN) is  present as well as when pulse-noise interference (PNI) is also present. Errors-and-erasures  decoding (EED), errors-only decoding and perfect side information (PSI) are  also considered.
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<br>Subjects: Electrical engineering; Random noise theory; Signs and symbols</div>
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Wei, Ho Kah</div>
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