Look-Up Table Based Low Complexity LLR Calculation for High-Order Amplitude Phase Shift Keying Signals

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概要

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• A low complexity log-likelihood ratio (LLR) calculation for high-order amplitude phase shift keying (APSK) signals is proposed. Using proper constellation partitioning together with a look-up table, the number of terms for the comparison of Euclidean distances can be significantly reduced. Compared with the log-sum LLR approximation, the proposed method reduces the computational complexity by more than 65% and 75% for 16-APSK and 32-APSK signals, respectively, with very small bit error rate performance degradation.

著者

• Wang Hua

  School Of Geodesy And Geomatics Wuhan University

• WU Nan

  School of Computer, National University of Defense Technology

• KUANG Jingming

  School of Information and Electronics, Beijing Institute of Technology

• YAN Chaoxing

  School of Information and Electronics, Beijing Institute of Technology

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