Theoretical analysis of symbol error rates of(4,12) circular-signal-set constellation for some detection schemes

摘要

The(4,12)circular-signal-set constellation[or(4,12) QAM]has been proposed for 16APSK in view of both the Minimum Euclidean distance between mapped signal Points and the realization of differential phase detection. Usually, the optimum value of the ring radio, which is the Ratio of the inner and outer ring level of signal constellation, Is decided as one of the parameters of 16APSK by using the Geometrical approach when the channel SNR is assumed to Be quite large. However, the optimum value should be Calculated by its symbol error rate to realize the best per- Formance over all channel SNRs.