The Extended COTS LPI Communication System Phase 3: Performance Analysis
SPACE AND NAVAL WARFARE SYSTEMS CENTER SAN DIEGO CA
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Phase 3 of the COTS LPI effort examines two LPI systems LPI-1 approximates an incoherent M-ary orthogonal system LPI-2 is a variant of the cyclic code-shift keying waveform. Each LPI system is assessed using the performance vector PeEb N0R W SNR t. The SNR is included with the three standard COMM variables as a measure of covertness. Slices of this function are used to rank LPI-1 and LPI-2. For additive white Gaussian noise, the fundamental trade-off that emerges for fixed bandwidth W is between the SNR and the bit rate R. A more covert system requires longer symbol vectors. These longer symbol vectors lower the bit rate. The LPI performance surface permits system engineers to graphically assess the trade-offs. For the multipaths of the Extended Littoral Battlefield, simulations show that multipath may either have no effect, improve performance, or degrade performance. The basic observation is the longer symbol vectors can mitigate the multipath effects. Analysis of this multipath effect, increasing the bit rate, and migrating these results in the LPI performance surface, are the basic Phase 4 recommendations.
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