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An Optimized SLM for PAPR Reduction in Non-coherent OFDM-IM
In this letter, we propose a peak-to-average power ratio (PAPR) efficient
non-coherent orthogonal frequency division multiplexing with index modulation
(OFDM-IM). It is shown that the non-coherent OFDM-IM design, which minimizes
PAPR, is a non-linear optimization problem. This can be visualized as the
optimization of the phase factor in selected mapping (SLM) technique. Further,
a special case is considered, where the inputs take only real values. We then
show how to approximately solve it using simple linear integer programming and
explicitly quantify the gap between the approximate and the optimal solutions.
A computationally efficient heuristic scheme is developed to obtain a
suboptimal solution of the integer optimization problem. Finally, our
simulation results indicate the merits of the proposed schemes.Comment: 5 pages, 1 figur