Improved interference cancellation to reduce the CRS interference in LTE/LTE-A Het-Nets

Nowadays, Heterogeneous networks mostly used in the advanced cellular networks such as Long Term Evolution (LTE) and Long Term Evolution-Advanced LTE — A to enhance the coverage, speed and throughput of the system. But the formation of smaller cells, like Pico and Femto cells increase the complexity of the network, also increase the interference levels of the system. The Intercell interference among macro and Pico/Femto cell reduces the overall activities of the system. The Common Reference Signal (CRS) is one of the major Intercell interference occurs between Macro and Pico cell. Normally these CRS signals are transmitted in the entire transmission band of the cells. So these will create more impact on the system performance. There are two categories of CRS interference, such as non-colliding CRS and colliding CRS interference. In this paper LS-LMMSE channel estimation method proposed for mitigating the non-colliding CRS interference and Enhanced Space Alternating Generalized Expectation-Maximization (ESAGE) with a maximum a-posteriori (MAP) criterion for colliding CRS interference cancellation is used. The simulation results confirm the proposed method improves the throughput and system performance than the existing methods.

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