이중 시공간 선 부호화 시스템 전송률 증대를 위한 채널 셔플링 행렬 및 디-셔플링 기법

초록

This study proposes the optimal channel shuffling (CS) matrices and de-shuffling methods to enhance thedata rate of CS double space-time line coded (CS-DSTLC) systems. The CS-DSTLC transmitter performs channel shuffling by finding the optimal shuffling matrix that maximizes the received signal-to-noise ratioamong total K shuffling matrices. For the correct de-shuffling at the receiver, the shuffling index can befeed-forwarded from the ransmitter or estimated by the k-means clustering algorithm. However, feed-forwardand k-means clustering-based de-shuffling methods degrade the data rate due to signaling overhead andshuffling errors, respectively. In this work, considering the signaling overhead and shuffling error rate, aCS-DSTLC system data rate model is designed. The optimal number of shuffling matrices K and de-shufflingmethods are then suggested. Simulation results show that the data rate can be maximized using thefeed-forward-based method in high-order modulation, yet the k-means clustering-based method achieves a higher data rate in low-order modulation. Also, it is verified that the data rate enhancement can be improved bychoosing an optimal K for a given frame length.

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