A Time-Efficient Approach for Designing LDPC-Coded MIMO Systems
Yao-Nan Lee, Chao-Kai Wen, Pangan Ting, Jiunn-Tsair Chen · 2006
With extrinsic information transfer (EXIT) chart code design tool, people can more easily design a capacity- approaching low-density parity-check (LDPC) codes for antenna- array-based multiple-input multiple-output (MIMO) systems. However, extremely time-consuming Monte-Carlo simulations are required to evaluate the statistics used in the EXIT charts, which makes capacity-approaching LDPC code design almost impossi- ble for large-scale MIMO systems. By making use of large-system performance analysis technique, we propose a time-efficient code design approach which eliminates the necessity of time-consuming Monte Carlo simulations and then makes capacity-approaching LDPC code design possible for large-scale MIMO systems. Nu- merical experiments show that the so-constructed LDPC codes attain comparable bit error rate performance with existing well- designed LDPC codes. In addition, we demonstrate that redesign- ing LDPC code is very helpful only when the ratio of number of transmit and that of receive antennas of a MIMO system varies.