稀疏多径信道环境中MIMO-OFDM系统的IQ不平衡和信道联合估计

Joint IQ Imbalance and Channel Estimation for MIMO-OFDM Systems with Sparse Multipath Channels

该文针对稀疏多径信道环境中的MIMO-OFDM系统所存在的IQ不平衡问题,提出了一种IQ不平衡参数和信道的联合估计方法。推导了联合估计的时域模型,提出了基于1 2l-l优化模型和平行坐标下降算法的联合估计算法。仿真结果表明,所提方法与传统的频域最小二乘算法和匹配追踪算法相比,显著提高了系统性能。

Considering the issue of In-phase and Quadrature-phase （IQ） imbalances in MIMO-OFDM systems with sparse multipath channels, a method jointing IQ imbalance with sparse channel estimation is proposed. The time-domain model for joint IQ imbalance and sparse channel estimation is derived and an estimation scheme based on l1-l2 norm optimization model and Parallel Coordinate Descent （PCD） algorithm is proposed. Simulation results show that the proposed scheme improves obviously the system performance compared with the traditional frequency-domain Least Squares （LS） and Matching Pursuit （MP） algorithms.