PIC based cell search against multi-cell interferences in HetNet

The explosive growth of the data traffic demands in cellular network has present more challenges. As the link efficiency is approaching its fundamental limitation, we can only increase the node deploy density to achieve satisfying network capacity. 3 GPP focus on Pico-cell overlaid HetNet, in which small cell base stations (pico eNB: pico evolved Node-B) with low transmit power are deployed at the hot spot within a macro cell. However, in today´s already dense deployments, the UE of small cell base station may suffer severe inter-cell interference from the neighboring macro cells. For this, we proposed a parallel interference cancellation scheme to accomplish the cell search procedure for the low power node in HetNet. PIC scheme can cancel all neighboring cells´ interfering in parallel comparing to the existing SIC scheme. By identifying, reconstruction and cancellation of both the target and interfering signals, we will achieve better cell search performance in HetNet.