Title: Enhanced interference cancellation techniques for downlink of LTE-A heterogeneous networks

Authors: S. Shibu; V. Saminadan

Addresses: Department of Electronics and Communication Engineering, Pondicherry Engineering College, Pillaichavadi, Puducherry 605104, India ' Department of Electronics and Communication Engineering, Pondicherry Engineering College, Pillaichavadi, Puducherry 605104, India

Abstract: The formation of Heterogeneous Network (HetNet) into the cellular system improves the overall spectral efficiency and network capacity of the system. Although the forming of the heterogeneous cellular network increases the complexity and overall interference of the system, the interference between the macro cell and smaller cells like femto/pico reduces the overall performance of the system in the downlink. In downlink, the Common Reference Signal (CRS) is used at the User Element (UE) to estimate the channel characteristics and is available throughout the entire frequency band. The presence of CRS of the neighbouring cells creates interference to the users. Linear Minimum Mean Square Error (LMMSE) based equaliser is proposed to reduce the effect of the non-colliding CRS at the UE. Enhanced space alternating generalised expectation maximisation-maximum a posteriori probability (ESAGE-MAP) estimator is used at the UE to mitigate colliding CRS interference. The simulation results have proved that the proposed LMMSE and ESAGE-MAP interference cancellation techniques perform better than the existing methods.

Keywords: CRS; common reference signal; LTE-A; long term evolution-advanced; HetNet; heterogeneous network; LMMSE; linear minimum mean square error; ESAGE; enhanced space alternating generalised expectation; maximisation.

DOI: 10.1504/IJWMC.2019.101426

International Journal of Wireless and Mobile Computing, 2019 Vol.17 No.2, pp.149 - 156

Accepted: 02 Apr 2019
Published online: 07 Aug 2019 *

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