Ahmed Hareedy

E-mail

ahareedy@metu.edu.tr

Department

Department of Electrical and Electronics Engineering

Protecting the Future of Information: LOCO Coding With Error Detection for DNA Data Storage İrimağzı, Canberk; Uslan, Yusuf; Hareedy, Ahmed (2024-01-01) From the information-theoretic perspective, DNA strands serve as a storage medium for 4-ary data over the alphabet A,T,G,C. DNA data storage promises formidable information density, long-term durability, and ease of replic...
Low-Complexity Constrained Coding Schemes for Two-Dimensional Magnetic Recording Özbayrak, Doğukan; Uyar, Duru; Hareedy, Ahmed (2024-01-01) The two-dimensional magnetic recording (TDMR) technology promises a remarkable increase in data storage density using the already-existing magnetic materials. Advanced TD signal processing techniques are required for this ...
Eliminating Media Noise While Preserving Storage Capacity: Reconfigurable Constrained Codes for Two-Dimensional Magnetic Recording Guzel, Iven; Özbayrak, Doğukan; Calderbank, Robert; Hareedy, Ahmed (2024-01-01) Magnetic recording devices are still competitive in the storage density race with solid-state devices thanks to new technologies such as two-dimensional magnetic recording (TDMR). TDMR offers remarkable storage density inc...
Probabilistic Design of Multi-Dimensional Spatially-Coupled Codes İrimağzı, Canberk; Tanrikulu, Ata; Hareedy, Ahmed (2024-01-01) Because of their excellent asymptotic and finite-length performance, spatially-coupled (SC) codes are a class of low-density parity-check codes that is gaining increasing attention. Multi-dimensional (MD) SC codes are cons...
LDPC Decoders Prefer More Reliable Parity Bits: Unequal Data Protection Over BSC Dabak, Beyza; Tiryaki, Ece; Calderbank, Robert; Hareedy, Ahmed (2023-01-01) Low-density parity-check (LDPC) codes are specified by graphs, and are the error correction technique of choice in many communications and data storage contexts. Message passing decoders diffuse information carried by pari...
Hierarchical Coding for Cloud Storage: Topology-Adaptivity, Scalability, and Flexibility Yang, Siyi; Hareedy, Ahmed; Calderbank, Robert; Dolecek, Lara (2022-06-01) In order to accommodate the ever-growing data from various, possibly independent, sources and the dynamic nature of data usage rates in practical applications, modern cloud data storage systems are required to be scalable,...
Breaking the Computational Bottleneck: Probabilistic Optimization of High-Memory Spatially-Coupled Codes Yang, Siyi; Hareedy, Ahmed; Calderbank, Robert; Dolecek, Lara (2022-01-01) IEEESpatially-coupled (SC) codes, known for their threshold saturation phenomenon and low-latency windowed decoding algorithms, are ideal for streaming applications and data storage systems. SC codes are constructed by par...
The Secret Arithmetic of Patterns: A General Method for Designing Constrained Codes Based on Lexicographic Indexing Hareedy, Ahmed; Dabak, Beyza; Calderbank, Robert (2022-01-01) IEEEConstrained codes are used to prevent errors from occurring in various data storage and data transmission systems. They can help in increasing the storage density of magnetic storage devices, in managing the lifetime o...
Read-and-Run Constrained Coding for Modern Flash Devices Hareedy, Ahmed; Zheng, Simeng; Siegel, Paul; Calderbank, Robert (2022-01-01) The pivotal storage density win achieved by solid-state devices over magnetic devices in 2015 is a result of multiple innovations in physics, architecture, and signal processing. One of the most important innovations in th...
Power Spectra of Constrained Codes with Level-Based Signaling: Overcoming Finite-Length Challenges Centers, Jessica; Tan, Xinyu; Hareedy, Ahmed; Calderbank, Robert (2021-08-01) In various practical systems, certain data patterns are prone to errors if written or transmitted. In magnetic recording and communication over transmission lines, data patterns causing consecutive transitions that are not...

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