Open AccessSimplified LLR algorithm for m‐QAM demodulation
Author(s) -
Cao Xianle,
Liu Yi,
Hu Dongfang
Publication year - 2019
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2019.0634
Subject(s) - demodulation , qam , computer science , algorithm , quadrature amplitude modulation , computation , constellation , perspective (graphical) , telecommunications , decoding methods , artificial intelligence , bit error rate , physics , channel (broadcasting) , astronomy
Here, a simplified algorithm to calculate log‐likelihood ratio (LLR) for m‐QAM demodulation is proposed. Traditional method calculating LLR for m‐QAM demodulation is supposed to do distance computing between any two constellation points so that the high complexity of the hardware implementation is not acceptable. This simplified method is different from the traditional ways that the distance calculation between any two points in a plane can be omitted, indicating that there is an advantage in the amount of computation in this simplified method. Finally, the simplified method is compared with traditional methods from the perspective of complexity and system performance. The simulation results show that the simplified method can greatly reduce the amount of calculation and have little effect on the performance of the system.