7 papers
Generator-Guided Inverse Sampling for Lévy-Driven Generative Models
Tianfu Qi, Jun Wang, Jun Zhang
This paper studies inverse sampling for Lévy-driven generative models from the perspective of Markov generators. Unlike conventional diffusion models, Lévy-driven dynamics involve…
Unsupervised Online Channel Estimation for High-Mobility OFDM via Implicit Neural Representation
Bohao Shi, Tianfu Qi, Xiaonan Chen +1
Accurate channel estimation remains challenging in high-mobility wireless systems because Doppler shifts induce severe inter-carrier interference (ICI) in Orthogonal Frequency Divi…
Capacity Bounds and Low-Complexity Constellation Shaping under Mixed Gaussian-Impulsive Noise
Tianfu Qi, Jun Wang
This paper investigates the bounds on channel capacity and constellation shaping under memoryless mixed noise, which is composed of impulsive noise (IN) and white Gaussian noise (W…
Channel Polarization under Channel Noise with Memory
Tianfu Qi, Jun Wang
The channel polarization behavior of polar codes under noise with memory is investigated. By introducing a genie-aided channel model, we first show that the polarized subchannels s…
Cutoff Rate Bounds and Constellation Shaping under Mixed Gaussian-Impulsive Noise
Tianfu Qi, Jun Wang
Mixed noise, composed of white Gaussian noise (WGN) and impulsive noise (IN), appears in numerous communication scenarios and can severely degrade system performance. In this paper…
Polarization Decomposition and Its Applications
Tianfu Qi, Jun Wang
The polarization decomposition of arbitrary binary-input memoryless channels (BMCs) is studied in this work. By introducing the polarization factor (PF), defined in terms of the co…