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<p>The Joint Tactical Information Distribution System (JTIDS) is a hybrid  frequency-hopped, direct sequence spread spectrum system. A (31, 15) Reed-Solomon  (RS) code is used for forward error correction coding, and cyclical code-shift keying  (CCSK) M-ary modulation is used, where each encoded symbol represents five bits. In  this thesis, a compatible waveform consistent with the existing JTIDS channel waveform  is analyzed. The system considered uses the same (31, 15) RS encoding as JTIDS. The  coded symbols are then transmitted on the in-phase (I) and quadrature (Q) components of  the carrier using 32-ary orthogonal signaling with 32-chip baseband waveforms and  detected noncoherently. For noncoherent detection, only one five bit symbol is  transmitted on both the I and Q components of the carrier, so the data throughput for  noncoherent detection is 1/2 that of coherent detection. This alternative waveform is  consistent with the direct sequence waveform generated by JTIDS. A sequential diversity  of two, consistent with the double-pulse structure of JTIDS, is also assumed, and  performance is examined both for the case of linear, soft diversity combining and also for  soft diversity combining with side information. The type of side information considered  is perfect side information (PSI).  Based on the analysis, we conclude that the double-pulse structure outperforms  the single-pulse structure for the alternative JTIDS waveform under examination.  Moreover, pulsed-noise interference (PNI) degrades the performance of the receiver, but  the use of PSI reduces the effect of PNI.
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<br>Subjects: Reed-Solomon codes; Signal processing; Digital techniques; Mathematics; Error-correcting codes (Information theory); Random noise theory</div>
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Kagioglidis, Ioannis</div>
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