Precise characterization of the HDMI leakage conforming pulse q(t) and misalignment parameter ε

Determine the precise conforming pulse q(t) that models the effective electromagnetic leakage produced by HDMI TMDS differential signaling as received by a Software Defined Radio, including establishing the value of the inter-wire delay mismatch parameter ε and identifying any additional waveform deviations beyond simple unaligned rectangular pulses, to enable accurate simulation, tuning, and analysis of the leakage channel.

Background

The paper derives an analytical model of unintended electromagnetic emanations from HDMI’s TMDS differential signaling, showing that imperfect alignment between the positive and negative conductors leads to a conforming pulse q(t) that shapes the leaked signal observed by an SDR. Accurate knowledge of q(t) is crucial for predicting where leaked power concentrates in the spectrum and for generating realistic simulations to train the proposed deep-learning reconstruction system.

However, the exact form of q(t) depends on hardware-specific imperfections and is not directly measurable in advance. The authors note their analysis assumes unaligned pulses with an unknown ε and acknowledge other differences may exist, making the precise characterization of q(t) and ε an unresolved issue that affects both system configuration and synthetic data fidelity.