A Bit-Mapping Strategy for Joint Iterative Channel Estimation and Turbo-Decoding

Godtmann, S.; Luders, H.; Ascheid, Gerd; Vary, Peter

doi:10.1109/vetecf.2008.197

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…The employment of UEP for systematic and parity bits of a turbo coded system has been shown, e.g. in Reference [6] where a faster convergence of a joint turbo decoding and channel estimation process is observed if systematic bits get stronger protection against errors than parity bits. This directly leads to gains in the BER performance in case of a fixed number of turbo decoding and channel estimation iterations.…”

Section: Uep and Proposed Bit Reorderingmentioning

confidence: 99%

An improvement of UMTS LTE 64QAM performance

Luders¹,

Minwegen²,

Eschbach³

et al. 2010

Trans Emerging Tel Tech

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SUMMARYIn this contribution we investigate the performance of the universal mobile telecommunications system (UMTS) long-term evolution (LTE) physical layer using turbo coding and 64QAM with Gray mapping. We show how the mapping of systematic and parity bits to the six different bit positions defining one complex 64QAM symbol influences the convergence of the turbo decoder and thereby the bit error rate (BER) performance as well as number of necessary decoding iterations. Exploiting the unequal error protection (UEP) property of Gray mapped 64QAM results in an signal-to-noise ratio (SNR) performance gain of approximately 2 dB for the non-iterative system and leads to goodput gains especially in regions of low SNR.

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Section: Uep and Proposed Bit Reorderingmentioning

confidence: 99%

An improvement of UMTS LTE 64QAM performance

Luders¹,

Minwegen²,

Eschbach³

et al. 2010

Trans Emerging Tel Tech

View full text Add to dashboard Cite

show abstract

“…In this contribution we exploit it for unequally protecting systematic and parity bits. The employment of UEP for systematic and parity bits of a turbo coded system has been shown, e.g., in [6] where a faster convergence of a joint turbo decoding and channel estimation process is observed if systematic bits get stronger protection against errors than parity bits. This directly leads to gains in the BER performance in case of a fixed number of turbo decoding and channel estimation iterations.…”

Section: Uep and Proposed Bit Reorderingmentioning

confidence: 99%

Improving UMTS LTE Performance by UEP in High Order Modulation

Luders

Minwegen

Vary

2009

Multi-Carrier Systems &Amp; Solutions 2009

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In this contribution we investigate the performance of the UMTS Long Term Evolution (LTE) physical layer using turbo coding and 64QAM with Gray mapping. We show how the mapping of systematic and parity bits to the six different bit positions defining one complex 64QAM symbol influences the convergence of the turbo decoder and thereby the bit error rate (BER) performance as well as number of necessary decoding iterations. Exploiting the unequal error protection (UEP) property of Gray mapped 64QAM results in an SNR performance gain of approximately 2 dB for the non-iterative system and in addition leads to a significant reduction of the necessary decoding iterations when iterative decoding is performed.

show abstract

A Bit-Mapping Strategy for Joint Iterative Channel Estimation and Turbo-Decoding

Cited by 2 publications

References 11 publications

An improvement of UMTS LTE 64QAM performance

An improvement of UMTS LTE 64QAM performance

Improving UMTS LTE Performance by UEP in High Order Modulation

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