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Channel Capacity and Soft-Decision Decoding of LDPC Codes for Spin-Torque Transfer Magnetic Random Access Memory (STT-MRAM)

Kui Cai , Zhiliang Qin , and Bingjin Chen
Data Storage Institute, Singapore, 117608

Abstract—Spin-torque transfer magnetic random access memory (STT-MRAM) has emerged as a promising non-volatile memory (NVM) technology, featuring compelling advantages in scalability, speed, endurance, and power consumption. In this paper, we focus on large-capacity stand-alone STT-MRAM, and investigate the channel capacity and the viability of applying low-density parity-check (LDPC) codes with soft-decision decoding to correct the memory cell errors and improve the storage density of STT-MRAM. We propose to use LDPC codes with short codeword lengths, with the reliability-based min-sum (RB-MS) algorithm for decoding. Furthermore, we propose to use the capacity-maximization criterion to design the quantizer and minimize the number of quantization bits. Simulation results demonstrate the potential of applying short-block-length LDPC codes with soft-decision decoding to improve the yield and push the scaling limitation of STT-MRAM. 

Index Terms—Spin-torque transfer magnetic random access memory (STT-MRAM), non-volatile memory (NVM), discrete memoryless channel (DMC), channel capacity, error correction codes (ECCs), low-density parity-check (LDPC) codes, quantization.

Cite:Kui Cai, Zhiliang Qin, and Bingjin Chen, "Channel Capacity and Soft-Decision Decoding of LDPC Codes for Spin-Torque Transfer Magnetic Random Access Memory (STT-MRAM)," Journal of Communications, vol. 8, no. 4, pp. 225-232 , 2013. Doi: 10.12720/jcm.8.4.225-232 

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