The Performance Research Of LTE-A System Based On Inter-cell Interference Cancellation

The technology of OFDM is a very crucial to the Advanced Long Term Elevance, it is used inLTE-A to avoid the interference in intra-cell which has become a very important performanceindicators. The inter-cell interference suppression technologies is developing rapidly, includinginterference randomization, interference coordination and interference cancellation, these traditionalsuppression technique is not good way to solve the problem, but recently the CoMP technology isproposed which is based on the inter-cell interference, this article is about the beamforming ofCoMP, it is used on high frequency antennas and vehicle systems.Beamforming algorithm is the concept that the value of the weight vector is adjusted to formthe maximum waveforming at desired signal otherwise the null waveforming at the otherinterference direction. Beamforming has the advantages of anti-noise performance, highercommunication capabilities and so on, the beamforming algorithm is divided into non-blindbeamforming, blind beamforming algorithm and waves orientation angle of the DOA estimationalgorithm.the non-blind beamforming algorithm is the focus of this study.Non-blind beamforming algorithm requires the reference sigal (pilot training sequences) toestimate the error, beamforming criteria has the MMSE, RLS, MaxSNR, LCMV and ML etc. theobjective function for the minimum, Finally, the optimal weight vector values, which are non-blindbeam-forming algorithms throughout the process. Based on this idea, the classical algorithms haveminimum mean square error algorithm (LMS), least-squares algorithm (RLS), the smallest linearconstraints algorithm (LCMV) and zero forcing algorithm (ZF) which are studied and analyzed.I propose two improved algorithms--M_LMS algorithm and M_LCMV algorithm. M_LMSalgorithm is based on mutually contradictory relationships between steady-state error and offsetamount, the step size factor is proposed variable. M_LCMV algorithm is based on the wave phaseerror estimation in desired direction. The improved algorithms are thought to be elaborated andverified by SIR and SINR to analyze its performance, the overall SIR improves10dB, SINRimproves6dB, so get a good inter-cell interference suppression.The results show that the improved beamforming technology is good to enhance theperformance of vehicle system. In the future it will make good effects on mobile communicationservices to improve the performance with a certain reference value.