التفاصيل البيبلوغرافية
| العنوان: |
Design of Irregular LDPC Codes for BIAWGN Channels with SNR Mismatch. |
| المؤلفون: |
Saeedi, Hamid1, Banihashemi, Amir H.1 |
| المصدر: |
IEEE Transactions on Communications. Jan2009, Vol. 57 Issue 1, p6-11. 6p. 1 Graph. |
| مصطلحات موضوعية: |
*INFORMATION theory, RADIO wave propagation, RANDOM noise theory, SIGNAL-to-noise ratio, SIGNAL processing, STOCHASTIC information theory |
| مستخلص: |
Belief propagation (BP) algorithm for decoding low- density parity-check (LDPC) codes over a binary input additive white Gaussian noise (BIAWGN) channel requires the knowledge of the signal-to-noise ratio (SNR) at the receiver to achieve its ultimate performance. An erroneous estimation or the absence of a perfect knowledge of the SNR at the decoder is referred to as "SNR mismatch". SNR mismatch can significantly degrade the performance of LDPC codes decoded by the BP algorithm. In this paper, using extrinsic information transfer (EXIT) charts, we design irregular LDPC codes that perform better (have a lower SNR threshold) in the presence of mismatch compared to the conventionally designed irregular LDPC codes that are optimized for zero mismatch. Considering that mm-sum (MS) algorithm is the limit of BP with infinite SNR over-estimation, the EXIT functions generated in this work can also be used for the efficient analysis and design of LDPC codes under the MS algorithm. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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