基于子空间法的空时分组码系统信道盲估计

结合多信道子空间理论,结合空时分组码的正交特性,提出了新的盲信道估计算法。首先,根据空时分组码结构特点,将原编码矩阵分解,并将接收矩阵合理地构造,把原信道矩阵重新构造成新的重构信道矩阵。然后求出重构信道矩阵的噪声子空间,之后利用信号子空间与噪声子空间正交特性,构造出信道矩阵作为变量的线性方程组,因而可以得到信道矩阵的闭式解。对三种典型的空时分组码进行仿真验证,仿真结果表明本算法的有效性。

Blind Channel Estimation for Space-Time Block Codes System Based on Subspace Methods

Based on the subspace method and the orthogonal property of space-time block codes, a new blind channel estimation algorithm was proposed, which only required very few training symbol. Making use of the orthogonal structure of space-time block codes, a new channel fading matrix could be obtained so that this channel matrix could be performed subspace decomposition. After sunspace decomposition, the close form solution of channel matrix could be obtained, according to the orthogonality of signal subspace and noise subspace. After simulation for three typical space-time codes, the simulation results prove validity of the proposed algorithm.