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Author

Robert Calderbank

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2 papers indexed here

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Preprint Oct 2026

Delay-Doppler Duality: Simplifying Exact Equalization of Zak-OTFS in Time or in Frequency

The Zak-OTFS carrier waveform is a pulse in the delay-Doppler (DD) domain, and given the input-output (I/O) relation at one DD point in a frame, we can predict the I/O relation at all other points. While it is simple to acquire the effective wireless channel with Zak-OTFS, the cost of embracing inter-carrier interferen...

Mudasir Ahmad Sheikh, Robert Calderbank · 0 citations
Preprint Sep 2026

Modulation Augmentation and Constellation Shaping for LDPC-Coded QPSK

While constellation shaping improves spectral efficiency, its application to quadrature phase-shift keying (QPSK) remains limited. We address this limitation by incorporating a short shaping code into low-density parity-check (LDPC)-coded QPSK systems. Specifically, a subset of LDPC codeword bits is used as shaping bit...

He-Ping Wan, Joonyoung Cho, Sandesh Rao Mattu et al. · 0 citations

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