Adequate Interleaving for Anti-Jam Spread Spectrum Systems.
ARMY MILITARY PERSONNEL CENTER ALEXANDRIA VA
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In anti-jam communication systems which employ error correction coding, the assumption is often made that the coding channel is memoryless. This assumption is typically justified by claiming that ideal or adequate interleaving is used. The thesis addresses two relevant issues what is adequate interleaving, and how much is performance compromised when interleaving is less than adequate A definition of adequate interleaving was determined from existing literature. Using this definition, it was possible to simulate overloaded interleavers. These convolutional interleavers operating under less than ideal conditions were analyzed, and a procedure was developed for determining the system error probability under these conditions. One important observation concerning convolutional interleavers is that while they do break up the burst interference of a pulse jammer, the scrambling is always done in a deterministic manner, and thus the channel with memory is not converted to a truly memoryless channel as is often assumed.
- Radiofrequency Wave Propagation