12 papers · ranked by Valyu relevance
Mohammad Noshad, Maïté Brandt-Pearce
—Orthogonal frequency division multiplexing (OFDM) is a modulation technique susceptible to source, channel and amplifier nonlinearities because of its high peak-toaverage ratio (PAPR). The distortion gets worse by increasing the average power of the OFDM signals since larger portion of the signals are affected by…
Jie Lian, Mohammad Noshad, Maïté Brandt-Pearce
Visible light communications (VLC) is a short-range optical wireless communication technology that uses light-emitting diodes (LEDs) as lighting devices and data transmitters. This paper describes a multiuser VLC system using Hadamard-coded modulation (HCM) for indoor data transmission. Considering the peak transmitted…
Farzad Kianvash, Matteo Rosati
quantum channels Authors: ['Farzad Kianvash' 'Matteo Rosati'] Abstract. Classical communication over lossy quantum channels is an essential topic in quantum information theory, with practical implications for optical-fiber and free-space communications. Multi-phase Hadamard codes, based on coherent-state Binary…
Mohammad Noshad, Maïté Brandt-Pearce
—Visible light communication (VLC) systems using the indoor lighting system to also provide downlink communications require high average optical powers in order to satisfy the illumination needs. This can cause high amplitude signals common in higher-order modulation schemes to be clipped by the peak power constraint…
Michael Windisch, Jakob Wassermann, Monica Leba, Olimpiu Stoicuta + 1 more
In communication technologies such as digital watermarking, wireless sensor networks (WSNs), and visual light communication (VLC), error-correcting codes are crucial. The Enhanced Hadamard Error-Correcting Code (EHC), which is based on 2D Hadamard Basis Images, is a novel error correction technique that is presented in…
Rifat Ara Shams
In this paper, the impact of Forward Error Correction (FEC) code namely Trellis code with interleaver on the performance of wavelet based MC-CDMA wireless communication system with the implementation of Alamouti antenna diversity scheme has been investigated in terms of Bit Error Rate (BER) as a function of…
Alireza Sheikh, Alexandre Graell i Amat, Gianluigi Liva
Coded modulation (CM) schemes allow achieving high spectral efficiencies as required by the increasing demand for network capacity. By suitably choosing the probability of occurence of the constellation points, probabilistic shaping can significantly improve the efficiency of CM. It has been recently demonstrated that…
Yuejun Wei, Yue Chen, Chunqi Chen, Bin Xia + 3 more
'Guojun Han' 'Zhiping Shi'] Multi-level coded modulation (MLCM) enhances data transmission by allocating error correction more effectively to bits with higher error probabilities, thus optimizing redundancy and improving performance. Despite MLCM’s advantages over traditional bit-interleaved coded modulation (BICM)…
Mikhail Ivanov, Alex Alvarado, Fredrik Brännström, Erik Agrell
—Two decoder structures for coded modulation over the Gaussian and flat fading channels are studied: the maximu m likelihood symbol-wise decoder, and the (suboptimal) bit-wise decoder based on the bit-interleaved coded modulation paradigm. We consider a 16-ary quadrature amplitude constellation labeled by a Gray…
Zhe Zhang, Liang Zhou, Junyi Du, Yue Zhao
It is very challenging to design the capacity-approaching labeling schemes for large constellations, such as 32-QAM, in delayed bit-interleaved coded modulation (DBICM). In this paper, we investigate the labeling design for 32-QAM DBICM with various numbers of bits delayed by one time slot. In particular, we aim to…
Giulio Ruffini
Hierarchical encoding is a structural element of the Free Energy Principle and related information-centric accounts of brain function, but a concrete circuit-level mechanism for it remains elusive. Here we examine Hierarchical Amplitude Modulation (HAM). In this computationally grounded scheme, information is encoded…
Authors not listed
Accurate prediction of reaction barriers and transition states is central to understanding electrolyte degradation pathways in battery systems, yet existing approaches face significant computational trade-offs. Classical quantum-chemistry methods like density functional theory (DFT) scale favorably but often miss…