For a multiple-input multiple-output (MIMO) system with unknown channel state information (CSI), a novel low-density parity check (LDPC)-coded transmission (LCT) scheme with joint pilot and data channel estimation is proposed. To fine-tune the CSI, a method based on the constraints introduced by the coded data from an LDPC code is designed such that the MIMO detector exploits the fine-tuned CSI. For reducing the computational burden, a coordinate ascent algorithm is employed along with several approximation methods, effectively reducing the required times of MIMO detection and computational complexity to achieve a satisfying performance. Simulation results utilizing WiMAX standard LDPC codes and quadrature phase-shift keying (QPSK) modulation demonstrate gains of up to 1.3 dB at a frame error rate (FER) of $10^{-4}$ compared to pilot-assisted transmission (PAT) over Rayleigh block-fading channels.

翻译：针对未知信道状态信息的多输入多输出系统，提出了一种融合导频与数据信道估计的新型低密度奇偶校验编码传输方案。为优化信道状态信息，设计了一种基于LDPC编码数据约束的方法，使MIMO检测器能够利用优化后的信道状态信息。为降低计算负担，采用坐标上升算法结合多种近似方法，有效减少了MIMO检测次数与计算复杂度，同时保持理想性能。基于WiMAX标准LDPC码与正交相移键控调制的仿真结果表明，在瑞利块衰落信道下，相较于导频辅助传输方案，该方案在帧错误率为$10^{-4}$时可获得最高1.3 dB的增益。