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

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2 Author(s)
Qiang Sun ; School of Electronic and Information Engineering, Beijing Jiao tong University, China ; Wenfei Qi

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+.

Published in:

Signal Processing (ICSP), 2012 IEEE 11th International Conference on  (Volume:3 )

Date of Conference:

21-25 Oct. 2012