With the increasing data throughput requirements, the cellular network needs to move from homogeneous to heterogeneous system. In fact, the coexistence of different types of base stations with different capabilities such as femto/pico base stations as well as relays and macro base stations in random placements should improve the coverage and the spectral efficiency of the cellular networks.
However, the complexity of inter-cell interference management will grow drastically and traditional interference avoidance/mitigation approaches need to be revised.
Approaching this problem at the user equipment (UE), is of great interest since it can rely on little coordination among base stations.
The work presented in this thesis focuses on a downlink interference cancellation at the UE and shows that such an intelligent receiver can bring its promised benefit only if the base stations get involved in the interference cancellation, specifically in the channel estimation process. The limitations of this approach are evaluated and depending on the surrounding base stations two solutions are proposed and discussed.
Contents
Notations
Acronyms
1 Introduction
1.1 Motivation and Objective
1.2 Outline and Organization of the Thesis
2 Fundamentals
2.1 Bit-Interleaved Coded Modulation
2.1.1 System and Signal Model
2.1.2 Low Complexity LLR Metrics for BICM Receivers
2.2 Interference-Aware System
2.2.1 IA Receiver: System & Signal Model
3 Structure of the Simulator
3.1 System Parameters & General Code Structure
3.2 Radio Propagation Channel
3.2.1 Simulation of AWGN-Channel model
3.2.2 Path Loss Channel Model
3.2.3 Simulation of Rayleigh Fading Channel
3.3 The Baseband Part of the Transmitter
3.3.1 Convolutional Coding and Puncturing
3.3.2 Bit-Interleaver
3.3.3 Bit-Level Scrambling
3.4 Interference Model
3.5 The Baseband Part of the Receiver
3.5.1 Pilot-based Channel Estimation
3.5.2 De-Puncturing and Soft Output Viterbi Decoding
3.5.3 Metric Computing Device
3.6 Base Stations Channel Estimation Enhancement
3.6.1 Serving Base Station: Holes
Contents
3.6.2 Interfering BS: Pilot Boosting
4 Simulation Results
5 Summary and Outlook
Bibliography
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