Interference-Aware Receiver Design in Ultra Dense Network

Data traffic demand in cellular networks grows up very fast. To increase network capacity, Ultra Dense Network is a candidate technique in next generation mobile communication. However, traditional linear receiver is no longer applicable due to the severe interference problem in Ultra Dense Network scenario. We probably use interference-aware receiver which complexity is much higher than linear receiver to get acceptable performance. This thesis proposes low-complexity interference-aware receiver while maintaining acceptable performance. Due to the difference of transmit power of different types of base station, we will encounter different interference streams. For strong interference stream, we propose Tree Search with Bit-level Cancellation Receiver which can cancel strong interference effectively both in flat fading and fast fading channel. For the residual weak interference, we propose Reduced Constellation search to reduce visit node during tree search and we analyze the error rate of Reduced Constellation search. Besides, we propose Just Acceptable Error Rate Reduced Constellation Bit-Level Cancellation Sphere Decoder which can dynamically switch Reduced Constellation search configuration by Reduced Constellation search error rate analysis.