Research On LTE-A Antenna Gain Imbalanee And Three Dimensiqaal Channel Model

Multi-antenna model and channel model are considered simply in current mobilecommunication systems.3GPP LTE-Advanced, one of the key technologies of thefourth generation mobile communication, introduces two actual and complex scenes:multi-antenna gain imbalance and three dimensional channel model. This paper mainlystudies the programs of antenna gain imbalance (AGI) and three dimensinal channelmodel of LTE-A system.First of all, a brief introduction of channel model and linear precoding technique inLTE system is raised.Then, based on the definition and model of AGI, the influence ofAGI on MIMO technology is studied. In the condition of AGI, the PEP of STBC system,the channel capacity of spatial multiplexing system and the quantization error ofprecoding codebook, are deduced. Meanwhile, the conclusion that AGI could decreasethe performance of MIMO technology is made, which fllows validated by simulationresults. Then, some methods of solving the problems of AGI in detal technology aresupported. In spatial multiplexing system, the method is changing the correlation ofantenna, which not performs well in high SNR. In STBC system, a ML detectionalgorithm combined with CRC technology is introduced, which makes AGI a goodcondition. Finally, according to the traditional base station antenna model and the threedimensional channel model, a new base station antenna model to satisfy the threedimensional channe model is introduced, and planar array antenna should be used inthis new model. Based on the traditional fixed beamforming algotithm, a threedimensional beaforming algotithm is put forwarded in the new antenna model. Theproposed algotithm preforms well in three dimensional channel model throughsimulation.