WHTDM replaces FFT with Walsh-Hadamard transform in OFDM, cuts transmitter complexity 2.5x and eliminates complex multipliers while delivering over an order of magnitude lower BER than 1-tap MMSE OFDM at 120 km/h via CD-MAMP equalization.
Channel hardening-exploiting message passing (CHEMP) receiver in large-scale MIMO systems,
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WHTDM: Walsh-Hadamard Transform Division Multiplexing for Doubly-Selective Channels
WHTDM replaces FFT with Walsh-Hadamard transform in OFDM, cuts transmitter complexity 2.5x and eliminates complex multipliers while delivering over an order of magnitude lower BER than 1-tap MMSE OFDM at 120 km/h via CD-MAMP equalization.