Abstract
In this paper, a novel non-coherent communication technique called generalized differential index modulation (GDIM) is presented. The key idea of GDIM is to modulate information bits to a joint permutation of rows and columns for a unitary matrix. It is shown that the proposed GDIM achieves a higher spectral efficiency than that attained by the existing differential modulation techniques including differential subcarrier index modulation and differential Alamouti code. An average bit-error-rate for GDIM is analyzed and applied to optimize GDIM constellation sets. Simulation results demonstrate that the proposed GDIM outperforms the existing differential modulation techniques in terms of bit-error-rates.
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