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PUSCH Channel Inter-cell Interference Cancellation in Uplink LTE System

Author: XiaoDaLiang
Tutor: ZengZhaoHua
School: Xi'an University of Science and Technology
Course: Communication and Information System
Keywords: LTE IRC MRC Adaptive IRC
CLC: TN929.5
Type: Master's thesis
Year: 2012
Downloads: 82
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Abstract


At present, in LTE, the principle of inter-cell interference cancellation is demodulatingeven decoding interference signal of interference cell in a certain extent; then usingprocessing gain of the receiver to eliminate the interference signal components from thereceived signal. In LTE system, two interference cancellation methods are considered. One isspace interference suppression technique based on multi-antenna receiving terminal, alsoknown as interference suppression combined （Interference Rejection Combining, IRC）receiver technology, the second is interference cancellation technology based on interferencereconstruction/minus.This paper focuses on depth study of the IRC technology. First of all, the production ofphysical shared channel （PUSCH） and OFDM fading analysis and two MIMO modes in theterminal are highlighted for the LTE uplink transmission technology. Next, introduce LTEInter-cell interference cancellation technology, and this part is the basis of the algorithmsimulation.Second, the MRC and IRC of the uplink interference cancellation technologies arestudied, including performance comparison of the two techniques. The performance of MRCand IRC in the low correlated channel is simulated.On this basis, the channel estimation accuracy enhances the performance of IRC andMRC, especially the new method, that is time domain quadratic windowing methods, which isproposed in this paper makes the performance of IRC and MRC increase that almost achievedthe performance of ideal channel estimation.Finally, the complexity of matrix inversion increased in2n with the dimensions of thematrix, so the down complexity of Rn-1 for IRC itself is analyzed. The performance simulationof various forms ofR nMatrix is compared, including full array,Rnnsimplify and Rnninverse simplify. The end of this paper highlights the adaptive IRC algorithm. In theswitching criterion, the MRC and IRC algorithm can be switched freely to achieve the goal ofimproving system performance. Through simulation, the feasibility and effectiveness of theproposed adaptive algorithm is further illustrated in LTE system.

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