On the performance of non-binary LDPC with MIMO in practical systems

Picchi, Ottavio M.; Mourad, Alain; García, Ismael; Luise, Marco

doi:10.1109/iswcs.2011.6125401

Cited by 2 publications

(3 citation statements)

References 9 publications

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“…It is noteworthy here that sub-optimal linear equalizers may be considered for the STBC detection, which will then be followed in a second step by the APP computation for non-binary LDPC decoder. Such linear approach was compared to the soft ML demapper in [4,10], where the latter was shown to significantly outperform the former. It is not in the scope of this article to reproduce such comparison, but rather focus on the complexity reduction of the soft ML demapper with the aim to make it practical for wireless communication systems.…”

Section: Receiver Operationsmentioning

confidence: 99%

Low complexity soft demapping for non-binary LDPC codes

Mourad

Picchi

García

et al. 2012

J Wireless Com Network

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This article focuses on non-binary wireless transmission, where "non-binary" refers to the use of non-binary Low Density Parity Check (LDPC) codes for Forward Error Correction. The complexity of the non-binary soft demapper is addressed in particular when one non-binary Galois Field (GF) symbol spreads across multiple Quadrature Amplitude Modulation (QAM) symbols and Space-Time Block Code (STBC) codewords. A strategy is devised to guarantee an efficient mapping at the transmitter, together with an algorithm at the receiver for low complexity soft Maximum Likelihood demapping. The proposed solution targets a trade-off between performance and complexity, and removes any restriction on the setting of the GF order, QAM constellation order, and STBC scheme. This makes the non-binary LDPC codes even more appealing for potential use in practical wireless communication systems.

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Section: Receiver Operationsmentioning

confidence: 99%

Low complexity soft demapping for non-binary LDPC codes

Mourad

Picchi

García

et al. 2012

J Wireless Com Network

Self Cite

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“…For the same number of transmit antennas, achieved spectral efficiencies are higher than [8], [5], [7] which limited the constellation size due to the GF size. The main differences between this research and most similar papers [9], [lO] are described as follows. The paper [9] also combines a non-binary LDPC code with a space-time mapper, but considers a non-iterative receiver.…”

Section: Introductionmentioning

confidence: 97%

“…The main differences between this research and most similar papers [9], [lO] are described as follows. The paper [9] also combines a non-binary LDPC code with a space-time mapper, but considers a non-iterative receiver. A factor graph approach is adopted in [lO] and used to derive conditions for a cycle free interleaved coded modulation graph, but the current work demonstrates strong iterative performance even with cycles.…”

Section: Introductionmentioning

confidence: 97%

Non-binary coded modulation and iterative detection for high spectral efficiency in MIMO

Chang

Romero

2012

2012 Conference Record of the Forty Sixth Asilomar Conference on Signals, Systems and Computers (ASILOMAR)

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Non-binary low density parity check codes (LDPC) have been shown to outperform their binary counterparts and at tain the best-known performance among error-correction codes.At the same time, it has also been established that wireless communication using mUltiple-input mUltiple-output (MIMO) schemes dramatically increases system capacity and reliability when information symbols are appropriately coded and mod ulated across transmit antennas. Recent works have studied techniques for applying non-binary LDPC codes to MIMO systems and demonstrated near-capacity performance. However, the constellation sizes in the proposed approaches are limited by the Galois field (GF) size of the non-binary LDPC code, thus limiting the maximum spectral efficiency of the proposed joint modulation-coding approaches. In practice, the GF size may be limited by computational complexity reasons but high spectral efficiencies are desired. Thus, we study iterative coded modulation based techniques for applying non-binary LDPC codes to higher order modulations. These methods have been well-studied for binary codes but not for non-binary codes. It is demonstrated that performance of the technique is dependent on the mapping of GF symbols to constellations, but applying the appropriate mapping attains near-capacity performance.To reduce the error floor region for smaller field sizes, while maintaining steep waterfall curves, we combine a nonbinary based accumulator with a parallel concatenated coding scheme.

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On the performance of non-binary LDPC with MIMO in practical systems

Cited by 2 publications

References 9 publications

Low complexity soft demapping for non-binary LDPC codes

Low complexity soft demapping for non-binary LDPC codes

Non-binary coded modulation and iterative detection for high spectral efficiency in MIMO

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