DocumentCode
1855991
Title
Soft-demodulation algorithm for 64QAM and it´s application in HSPA+
Author
Sun Qiang ; Qi Wenfei
Author_Institution
Sch. of Electron. & Inf. Eng., Beijing Jiao tong Univ., Beijing, China
Volume
3
fYear
2012
fDate
21-25 Oct. 2012
Firstpage
2309
Lastpage
2312
Abstract
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+.
Keywords
demodulation; quadrature amplitude modulation; 64QAM; HSPA+; bit-level soft demodulation; frequency spectrum utilization; high speed communication systems; signal constellation rearrangement; soft-demodulation algorithm; 64Quadrature Amplitude Modulation (64QAM); HSPA Evolution(HSPA+); Hybrid ARQ; Log-Likelihood Ratio (LLR); Soft-Demodulation Algorithm and Application; constellation rearrangement;
fLanguage
English
Publisher
ieee
Conference_Titel
Signal Processing (ICSP), 2012 IEEE 11th International Conference on
Conference_Location
Beijing
ISSN
2164-5221
Print_ISBN
978-1-4673-2196-9
Type
conf
DOI
10.1109/ICoSP.2012.6492042
Filename
6492042
Link To Document