Optimal pilot design for OTFS in linear time-varying channels
I. Van der Werf (TU Delft - Signal Processing Systems)
R Heusdens (Netherlands Defence Academy, TU Delft - Signal Processing Systems)
RC Hendriks (TU Delft - Signal Processing Systems)
Geert J.T. Leus (TU Delft - Signal Processing Systems)
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Abstract
This paper investigates the positioning of the pilot symbols, as well as the power distribution between the pilot and the communication symbols for the orthogonal time frequency space (OTFS) modulation scheme. We analyze the pilot placements that minimize the mean squared error (MSE) in estimating the channel taps. This allows us to identify two new pilot allocations for OTFS that save approximately 50% of the pilot overhead compared to existing allocations. In addition, we optimize the average channel capacity by adjusting the power distribution. We show that this leads to a significant increase in average capacity. The results provide valuable guidance for designing the OTFS parameters to achieve maximum capacity. Numerical simulations are performed to validate the findings.
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