One-dimensional soft-demapping using decorrelation with interference cancellation for rotated QAM constellations

Kim, Kyeongyeon; Bae, Kwang‐Hak; Yang, Ho

doi:10.1109/ccnc.2012.6181165

Cited by 4 publications

(3 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In [10], the authors propose performing an MMSE decorrelation followed by IC to decorrelate the I and Q components. This is similar to methods commonly used in MIMO (multiple input -multiple output) detectors.…”

Section: Wasmentioning

confidence: 99%

“…To further decrease complexity, one may replace the minimum distance calculations in (4) with lookup tables [10]. Interference cancellation may be performed on the weakest channel (I or Q), which is determined by selecting the component corresponding to the smallest value of q I and q Q .…”

Section: Wasmentioning

confidence: 99%

“…Various algorithms for the demapping of rotated constellations have been discussed in [1,3,10,11,16]. In addition to the maximum likelihood (ML) demapper as well as its max-log simplification [3,11], the algorithms based on minimum mean squared error (MMSE) decorrelation and interference cancellation (IC) described in [10], will also be implemented and measured on the GPU.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Implementation and performance analysis of DVB-T2 rotated constellation demappers on a GPU

Grönroos

Nybom

Björkqvist

2013

Analog Integr Circ Sig Process

View full text Add to dashboard Cite

The DVB-T2 standard for digital terrestrial broadcasting supports the use of quadrature amplitude modulation constellations where the constellation points are rotated in the I-Q plane. This combined with a cyclic delay of the Q component provides improved performance in some fading channels. The complexity of the optimal demapping process for rotated constellations is however significantly higher than for non-rotated constellations. This makes the DVB-T2 demapper one of the most computationally complex parts of a receiver. In this article, we examine possible simplifications of the demapping process suitable for implementation on a general purpose computer containing a modern graphics processing unit (GPU). Furthermore, we measure the performance in terms of throughput, as well as accuracy, of the implemented algorithms. The implementations are designed to interface efficiently to a previously implemented real-time capable GPU-based low-density parity-check channel decoder.

show abstract

Section: Wasmentioning

confidence: 99%

Section: Wasmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Implementation and performance analysis of DVB-T2 rotated constellation demappers on a GPU

Grönroos

Nybom

Björkqvist

2013

Analog Integr Circ Sig Process

View full text Add to dashboard Cite

show abstract

Max-log demapper architecture design for DVB-T2 rotated QAM constellations

Yang

et al. 2015

2015 IEEE Workshop on Signal Processing Systems (SiPS)

View full text Add to dashboard Cite

International audience— Rotated and cyclic-Q delayed (RCQD) quadrature amplitude modulation (QAM) improve DVB-T2 system performance over highly time-frequency selective channels. However, when compared with conventional QAM demapper, the RCQD demapper requires a higher computational complexity. In this paper, a complexity-reduced max-log demapper is derived and implemented over a FPGA platform. The proposed demapper allows to find the maximum likelihood (ML) point with a search spanning only M signal constellation points and guarantees to obtain the same log-likelihood ratio (LLR) metrics as the optimum max-log soft decision demapper while spanning at most 2 M signal constellation points. The optimized hardware implementation introduces only a slight performance loss compared to the floating-point full complexity max-log performance. Index Terms — DVB-T2, Rotated and Cyclic Q Delayed (RCQD) Constellations, Log-Likelihood Ratio (LLR), Max-Log Demapper

show abstract