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International Journal of Advanced Engineering Application

ISSN: 3048-6807

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A Combined Statistical and Prioritized Unequal Error Protection Approach for LDPC Codes

Author(s):Teja Kiran .H1,Krishna Kumar2, Naveen Chaitanya.K3

Affiliation: 1,2,3 Sreenidhi Institute of Science and Technology, Hyderabad-India

Page No: 38-46

Volume issue & Publishing Year: Volume 1 Issue 7,Nov-2024

Journal: International Journal of Advanced Engineering Application (IJAEA)

ISSN NO: 3048-6807

DOI:

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Abstract:
The combination of powerful error-correcting codes like Low Density Parity Check (LDPC) codes and Quadrature Amplitude Modulation (QAM) has been widely adopted in wireless communication standards such as IEEE 802.11n and DVB-T2. Recently, various Unequal Error Protection (UEP) schemes have been proposed that leverage the non-uniform degree distribution of bit nodes in irregular LDPC codes. Similarly, schemes that utilize the inherent UEP properties of the QAM constellation have also been developed. This paper proposes a hybrid UEP scheme for LDPC codes with QAM. The scheme maps systematic bits of the LDPC encoded symbols to the QAM constellation based on the statistical distribution of source symbols. Specifically, symbols with the highest probabilities of occurrence are assigned to the low-power region of the QAM constellation, while those with lower probabilities are mapped to the high-power region. This reduction in overall transmission power enables increased spacing between QAM constellation points. Additionally, the scheme maps parity bits with the highest degree, based on the LDPC code-word's bit node degree distribution, to prioritized QAM constellation points. Simulations using IEEE 802.11n LDPC codes show that the proposed scheme achieves up to a 0.91 dB improvement in Eb/No compared to other UEP schemes across a range of Bit Error Rate (BER) values.

Keywords: Low-Density Parity-Check codes, Quadrature Amplitude Modulation, Unequal Error Protection.

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