MIMO-OFDM系统中的子空间半盲信道估计

Subspace-based semi-blind channel estimation for MIMO-OFDM systems

本文主要讨论了MIMO-OFDM系统中的一种半盲信道估计算法。该算法基于子空间分解技术,利用信号子空间和噪声子空间的正交性将两者分离。针对盲信道估计存在计算量大及收敛速度慢等缺点,本文充分利用少量的导频,给出了一种基于子空间跟踪技术的半盲MIMO-OFDM信道估计算法。仿真结果表明,该算法在保持盲信道估计算法性能的基础上,明显加快了收敛速度、降低了计算量。

A semi-blind channel estimation algorithm for MIMO-OFDM system is discussed mainly in this paper. The algorithm is based on the subspace decomposition technique. The signal subspace is separates from the noise subspace by making use of the orthogonality between them. Since the convergence speed is slow and the computational complexity is very high, a semi-blind channel estimation algorithm based on subspace tracking is given by using a little pilots. Simulation results show that the algorithm quickens the convergence speed and reduces the computational complexity significantly without any performance penalty.