Distributed precoding technology of reducing inter-cell interference in LTE downlink

Aim at the problem of the adjacent cell interference in LTE (long Term Evolution) system, a distributed pre-coding technology based on singular Value Decomposition (SVD) was presented, which need not to exchange user date between the cooperation base station, just need to know the channel state information (CSI) from the baste station to all users (include expected users and adjacent cell users). According to the CSI, The base station can get the pre-coding matrix based on EVD and implementing distributed precoding. Simulation results show that the presented distributed pre-coding method can reduce the inter cell interference and increase the spectral efficiency of users at the cell edge. At the same time, the computational complexity of the presented algorithm is lower than the BD-GMD algorithm and its error bit performance can improve 8dB relative to BD-GMD algorithm when date stream number is 1.

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