DocumentCode :
2356764
Title :
A Geometrical Approach for Highly Efficient Soft Demodulation of Rotated Constellations
Author :
Min Li ; Bourdoux, Andre ; Dejonghe, Antoine ; Van der Perre, Liesbet
Author_Institution :
IMEC, Leuven, Belgium
fYear :
2012
fDate :
17-19 Oct. 2012
Firstpage :
179
Lastpage :
184
Abstract :
Rotated constellations have shown promising potentials for harsh channel conditions and it becomes an crucial feature of DVB-T2. Several other standards, such as new generations of ATSC and DTMB, are also considering it. How-ever, the superiority of performance comes at the cost of orders of magnitudes higher complexity for demodulation, which is a crucial part of the receiver. Constellations of conventional QAM modulations stay on completely regular integer points, so that the demodulation can be as simple as quantization and table lookup. However, the rotation and independent transmissions of I/Q branches break the above properties, so that soft demodulation becomes much more complex. Previous efficient solutions are mostly based on reduced search instead of performing a full search. We take a totally different approach that derives closest constellation points with geometrical transformations. Search is completely avoided. This results in orders of magnitudes of complexity reduction.
Keywords :
demodulation; digital video broadcasting; diversity reception; quadrature amplitude modulation; ATSC; DTMB; DVB-T2; QAM modulation; geometrical transformation; rotated constellation; soft demodulation; Clocks; Complexity theory; Constellation diagram; Demodulation; Digital video broadcasting; Quadrature amplitude modulation; Quantization; Rotated constellation; soft demodulation;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Signal Processing Systems (SiPS), 2012 IEEE Workshop on
Conference_Location :
Quebec City, QC
ISSN :
2162-3562
Print_ISBN :
978-1-4673-2986-6
Type :
conf
DOI :
10.1109/SiPS.2012.63
Filename :
6363203
Link To Document :
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