Performance Analysis of Novel Interference Mitigation Schemes in Heterogeneous Networks over Rayleigh and Rician Fading Channels

Abstract

of Long Term Evolution (LTE) for indoor coverage extension. Heterogeneous networks in which femto and pico-cells are overlaid onto macro-cells are extensively discussed. In order to maintain reliable service of macro-cells, it is important to mitigate destructive femto-femto (co-channel) and femto-macro (adjacent or cross channel) cell interferences respectively. This paper presents the performance analysis of two novel schemes in order to mitigate interference issues in femto-cells. The significant advantage of the proposed femto cooperative (Fe-COPE) scheme is to mitigate co-channel interference that needs no back-haul connection. However, the another proposed Femto Adjacent (FE-ADJ) scheme helps to mitigate adjacent-channel interference and works with coordination of femto and macro base stations by using wired back-haul. The performance is analyzed over independent and identical (i:i:d) Rayleigh and Rician-K fading environments. The closed form expressions for the moment generating function (MGF) of the received signal-to-noise-ratio (SNR) are derived in order to evaluate the average symbol error rate (SER) analysis and then compute the bit error rate (BER) expressions under the M-QAM modulation scheme. Our simulation demonstrates considerable improvement in the curves of BER as a function of SNR. Monte-Carlo simulations are conducted to verify the correctness of the analytical expressions that are derived for the two proposed schemes.