Performance Improvement of the DSRC System Using a Novel S and ?-Decision Demapper

Jeich Mar; Chi-Cheng Kuo
November 2009
Wireless Sensor Network;Nov2009, Vol. 1 Issue 4, p268
Academic Journal
Based on the constellation diagram of the different modulations, a novel S and Π-decision rule is designed for the analog demapper of the orthogonal frequency-division multiplexing (OFDM) systems. The dedicated short-range communications (DSRC) system is chosen as an OFDM platform to compare the performance among the proposed S and Π-decision decoder, hard-decision and soft-decision decoders. Simulation results demonstrate that both the complexity and performance of S and Π-decision demapper used for M-ary quadrature amplitude modulation (QAM) OFDM system can be greatly improved. The number of decisions between the received symbol and constellation points can be simplified to look up table log2M times for M-ary QAM OFDM system.


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