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Table 2 The reference signal and spectral efficiency comparison

From: Compressive sensing-based channel estimation for SC-FDE system

Channel estimation scheme LS/MMSE OMP/SP PIA-OMP/PIA-SP
Reference signal DUW UW UW
Data block length (N) 512 512 512
Reference signal length (P) 128 64 64
Spectral efficiency (η) 80% 88.9% 87.6%