Performance of Antenna Permutation for Multi-rate Gigabit MIMO-LDPC

ETRI has developed and successfully demonstrated a mobile communications technology dubbed "New Nomadic Local Area Wireless Access" (NoLA) that will allow users to download data at 3.6 Gbps. NoLA is designed as an 8times8 MIMO-OFDM system. NoLA transmits two lower rate streaming signals and six higher rate streaming signals through eight transmit antennas. After QR-decomposition of the received multi-rate signals, the lower rate streaming signals are decoded by multi-dimensional detector and removed by the successive interference cancellation scheme. The remaining six higher rate streaming signals are decoded using a weighted zero-forcing detector. Besides, NoLA adopts an independent LDPC coding scheme to process high-speed decoding at gigabit. In this paper, we propose an antenna permutation scheme for multi-rate MIMO systems with an independent LDPC coding scheme like NoLA. The simulation results show that the higher rate streaming signals achieve higher performance gain than the lower rate streaming signals by only a simple modification of the MIMO-OFDM system.