36 citations · 150 across the 15 of their papers we have counts for
17 papers
Phase-based Ranging in Narrowband Systems with Missing/Interfered Tones
Alireza Sheikh, Jac Romme, Jochem Govers +2
The growth in the number of low-cost narrow band radios such as Bluetooth low energy (BLE) enabled applications such as asset tracking, human behavior monitoring, and keyless entry…
List-encoding CCDM: A Nonlinearity-tolerant Shaper Aided by Energy Dispersion Index
Kaiquan Wu, Gabriele Liga, Alireza Sheikh +3
Recently, a metric called energy dispersion index (EDI) was proposed to indicate the nonlinear interference (NLI) induced by correlated symbols during optical transmission. In this…
Temporal Energy Analysis of Symbol Sequences for Fiber Nonlinear Interference Modelling via Energy Dispersion Index
Kaiquan Wu, Gabriele Liga, Alireza Sheikh +2
The stationary statistical properties of independent, identically distributed (i.i.d.) input symbols provide insights on the induced nonlinear interference (NLI) during fiber trans…
Novel High-Throughput Decoding Algorithms for Product and Staircase Codes based on Error-and-Erasure Decoding
Alireza Sheikh, Alexandre Graell i Amat, Alex Alvarado
Product codes (PCs) and staircase codes (SCCs) are conventionally decoded based on bounded distance decoding (BDD) of the component codes and iterating between row and column decod…
Refined Reliability Combining for Binary Message Passing Decoding of Product Codes
Alireza Sheikh, Alexandre Graell i Amat, Gianluigi Liva +1
We propose a novel soft-aided iterative decoding algorithm for product codes (PCs). The proposed algorithm, named iterative bounded distance decoding with combined reliability (iBD…
30% Reach Increase via Low-complexity Hybrid HD/SD FEC and Nonlinearity-tolerant 4D Modulation
Gabriele Liga, Bin Chen, Sjoerd van der Heide +4
Current optical coherent transponders technology is driving data rates towards 1 Tb/s/λand beyond. This trend requires both high-performance coded modulation schemes and efficient…
On Parameter Optimization of Product Codes for Iterative Bounded Distance Decoding with Scaled Reliability
Alireza Sheikh, Alexandre Graell i Amat, Gianluigi Liva +1
We use density evolution to optimize the parameters of binary product codes (PCs) decoded based on the recently introduced iterative bounded distance decoding with scaled reliabili…
On Product Codes with Probabilistic Amplitude Shaping for High-Throughput Fiber-Optic Systems
Alireza Sheikh, Alexandre Graell i Amat, Alex Alvarado
Probabilistic amplitude shaping (PAS) can flexibly vary the spectral efficiency (SE) of fiber-optic systems. In this paper, we demonstrate the application of PAS to bit-wise hard d…
A novel soft-aided bit-marking decoder for product codes
Gabriele Liga, Alireza Sheikh, Alex Alvarado
We introduce a novel soft-aided hard-decision decoder for product codes adopting bit marking via updated reliabilities at each decoding iteration. Gains up to 0.8 dB vs. standard i…
Binary Message Passing Decoding of Product-like Codes
Alireza Sheikh, Alexandre Graell i Amat, Gianluigi Liva
We propose a novel binary message passing decoding algorithm for product-like codes based on bounded distance decoding (BDD) of the component codes. The algorithm, dubbed iterative…
Binary Message Passing Decoding of Product Codes Based on Generalized Minimum Distance Decoding
Alireza Sheikh, Alexandre Graell i Amat, Gianluigi Liva
We propose a binary message passing decoding algorithm for product codes based on generalized minimum distance decoding (GMDD) of the component codes, where the last stage of the G…
Energy-Efficient Soft-Assisted Product Decoders
Christoffer Fougstedt, Alireza Sheikh, Alexandre Graell i Amat +2
We implement a 1-Tb/s 0.63-pJ/bit soft-assisted product decoder in a 28-nm technology. The decoder uses one bit of soft information to improve its net coding gain by 0.2 dB, reachi…
On Low-Complexity Decoding of Product Codes for High-Throughput Fiber-Optic Systems
Alireza Sheikh, Alexandre Graell i Amat, Gianluigi Liva +2
We study low-complexity iterative decoding algorithms for product codes. We revisit two algorithms recently proposed by the authors based on bounded distance decoding (BDD) of the…
Iterative Bounded Distance Decoding of Product Codes with Scaled Reliability
Alireza Sheikh, Alexandre Graell i Amat, Gianluigi Liva
We propose a modified iterative bounded distance decoding of product codes. The proposed algorithm is based on exchanging hard messages iteratively and exploiting channel reliabili…
Probabilistic Amplitude Shaping with Hard Decision Decoding and Staircase Codes
Alireza Sheikh, Alexandre Graell i Amat, Gianluigi Liva
We consider probabilistic amplitude shaping (PAS) as a means of increasing the spectral efficiency of fiber-optic communication systems. In contrast to previous works in the litera…
Probabilistically-Shaped Coded Modulation with Hard Decision Decoding for Coherent Optical Systems
Alireza Sheikh, Alexandre Graell i Amat, Gianluigi Liva
We consider probabilistic shaping to maximize the achievable information rate of coded modulation (CM) with hard decision decoding. The proposed scheme using binary staircase codes…
Achievable Information Rates for Coded Modulation with Hard Decision Decoding for Coherent Fiber-Optic Systems
Alireza Sheikh, Alexandre Graell i Amat, Gianluigi Liva
We analyze the achievable information rates (AIRs) for coded modulation schemes with QAM constellations with both bit-wise and symbol-wise decoders, corresponding to the case where…