This paper considers the channel estimation in the long term evolution(LTE) downlink system.We introduce the linear minimum mean squared error(LMMSE) estimation algorithm which is used in frequency domain and time domain.Following this,we propose some methods like mismatched model or sliding window.The proposed method reduces the complexity of LMMSE algorithm in avoiding the complicated calculation in channel correlation matrix and a large number of data to be saved.At last,we use added pilot,pre-subframe and post-subframe data to improve the estimation performance.Simulation results show that the proposed methods can significantly improve the system performance in low complexity.

芜湖凤凰美食街,2000年3月由芜湖市规划设计研究院进行方案设计,旨在规划建筑设计中突出生态与人文结合之理念,充分注重环境保护,突出美化、净化、亮化为主体的格局。使之成为以餐饮为笼头,融旅游、休闲、购物、娱乐为一体的专业化、高品位的美食街。

Since Wuhu was forced to open and trade to abroad in 1876, the Western people came to trade and do missionary work, and made a number of buildings along the Yangtze River. Those and the old-fashioned buildings of Ming and Qing Dynasties in the old town, and a group of modern buildings in the Zhongshan Street, contribute combinately building culture of the old and contemporary times to Wuhu, and reflect the building characteristics of “Surviving Rhyme of Ancient Anhui”.