Co-channel interference mitigation in LTE systems

Abstract

In emerging Long Term Evolution (LTE) systems, it is expected to reuse the same set of frequency subchannels in each and every cell as much as possible. This will result in high co-channel interference (CI), which degrades the system performance significantly. Hence CI acts as the main performance limiting factor Therefore in order to achieve high system performance, it is imperative to mitigate CI. In this research project we propose a turbo /iterative) receiver architecture, which consists of a soft symbol detector and a soft channel decoder, for the downlink of LTE systems. Moreover, a minimum mean squared error (MMSE) based soft symbol detector is developed to suppress the CI and cancel the co-antenna interference (CAI), which is used in the turbo receiver. In order to improve the performance further, the adaptive fractional frequency reuse (AFFR) coordination scheme is implemented. Using computer simulations, the performance of the proposed receiver is thoroughly investigated for the LTE downlink. The considerable performance improvement achievable using the proposed advanced receiver scheme and its low computational complexity, make it attractive for the implementation in future LTE systems