用串行干扰消除算法提高同频组网信道估计精度

为降低TD-SCDMA系统同频组网时邻区干扰对信道估计精度的影响,提出了一种逐个邻区串行干扰消除的信道估计算法.算法先消除本小区用户的信号,然后依次对每个邻区进行信道估计,重构其中的强干扰用户信号,再逐个从接收训练序列中加以消除,最后用串行消除各个邻区干扰后的接收训练序列对本小区用户进行信道估计.仿真结果表明,采用串行干扰消除的信道估计方法信道估计误差较低,将其用于上行链路的联合检测接收机,解调性能约提升2 dB.因此,所提出的信道估计算法,可有效消除邻区强干扰用户对信道估计精度的影响,从而提高了同频组网时系统的性能.

Serial interference cancellation based channel estimation for improving the estimation accuracy in an intra-frequency network

Serial interference cancellation channel estimation algorithm by orderly eliminating the adjacent cells interference was proposed for an intra-frequency TD-SCDMA network to reduce the effect of adjacent cells interference to the accuracy of channel estimation.The proposed algorithm firstly eliminated the inter-cell signals produced by local cell active users and then serially reconstructed and removed the strong interfering adjacent-cell users signal one adjacent cell after another using the estimated channel impulse response of adjacent cells.Finally,the signals after adjacent cells serial interference cancellation were used for local cell channel estimation.Simulations showed the lower estimation error and about 2 dB performance gain at the joint detection receiver by exploiting the serial interference cancellation channel estimation algorithm.By eliminating effectively the interference from strong interfering users in adjacent cells,the proposed algorithm can increase the accuracy of channel estimation and then improve the performance of the intra-frequency TD-SCDMA system.