TY  - JOUR
T1  - Channel Shuffling Matrix and De-Shuffling Methods for Rate Enhancement of Double Space-Time Line Coded Systems
AU  - Kim, Jaehong 
AU  - Joung, Jingon 
JO  - The Journal of Korean Institute of Communications and Information Sciences
PY  - 2024
DA  - 2024/1/1
DO  - 10.7840/kics.2024.49.10.1358
KW  - Double space-time line code
KW  - channel shuffling
KW  - signaling overhead
KW  - k-means clustering
AB  - This study proposes the optimal channel shuffling (CS) matrices and de-shuffling methods to enhance the data 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 ratio among total K shuffling matrices. For the correct de-shuffling at the receiver, the shuffling index can be feed-forwarded from the transmitter or estimated by the k-means clustering algorithm. However, feed-forward and k-means clustering-based de-shuffling methods degrade the data rate due to signaling overhead and shuffling errors, respectively. In this work, considering the signaling overhead and shuffling error rate, a CS-DSTLC system data rate model is designed. The optimal number of shuffling matrices K and de-shuffling methods are then suggested. Simulation results show that the data rate can be maximized using the feed-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 by choosing an optimal K for a given frame length.