| LTE system have brought a great change to the communication field, mostly because LTE physical layer using OFDM technology make transmission speed much more faster than the traditional mobile communication systems. So LTE system have become one of popular future4G technologies. After the works of many experts all over the world, LTE technology has made great progress. And as LTE technology matures, LTE-A technology has been brought out to be studied, in order to achieve the goal of faster and better performance by introducing some new technologies. Compared with LTE system, LTE-A system makes not only extend in existed technologies of LTE system, but also introduces many new technologies.This paper studies the receiver algorithm in the LTE-A system with MIMO. Receiver technology algorithm include a lot of algorithms, such as channel estimation algorithm, TURBO decoding algorithm, multi-antenna detection algorithm. This paper studies channel estimation algorithms and multi-antenna detection algorithms in LTE-A uplink system. There is a great difference in the position of reference signals between uplink system and downlink system, for example, there is an interference between the different antenna in uplink system while there is no such problem in downlink system. In uplink channel estimation for MIMO, the traditional way is to add a time window to distinguish different antennas. And this paper gives a new method that could improve performance. As to the multi-antenna detection part, this paper combine traditional algorithm researching serial interference canceling algorithm and MMSE algorithm, and optimize the part of serial interference canceling algorithm. So the proposed algorithm has better performance than the traditional algorithm, although much more complicated. |
