Soft-demodulation algorithm for 64QAM and it's application in HSPA+

Soft-demodulation algorithm for 64QAM and it's application in HSPA+

QAM is very favorable in high speed communication systems, because it could enhance the frequency spectrum utilization of them. In this paper, consists of two aspects. On the one hand, the theoretical algorithm of bit-level soft demodulation for 64QAM is analyzed, and two simplified algorithm to cal...

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Bibliographische Detailangaben
Hauptverfasser: Sun, Qiang, Qi, Wenfei
Format: Tagungsbericht
Sprache:eng
Schlagworte:
64Quadrature Amplitude Modulation (64QAM)
AWGN channels
constellation rearrangement
Decoding
Demodulation
HSPA Evolution(HSPA+)
Hybrid ARQ
Log-Likelihood Ratio (LLR)
Mathematical model
Modulation
Quadrature amplitude modulation
Signal to noise ratio
Soft-Demodulation Algorithm and Application
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Beschreibung
Zusammenfassung:QAM is very favorable in high speed communication systems, because it could enhance the frequency spectrum utilization of them. In this paper, consists of two aspects. On the one hand, the theoretical algorithm of bit-level soft demodulation for 64QAM is analyzed, and two simplified algorithm to calculate LLR is developed. On the other hand, an advanced Hybrid ARQ (HARQ) with chase combing is presented, employing 64QAM modulation and signal constellation rearrangement; also introduce the application in HSPA+.
ISSN:2164-5221
DOI:10.1109/ICoSP.2012.6492042