Investigation on Cancellation of Inter-Cell Interference in TDD-CDMA System
Wenbo Wang · Dianzi Ke-ji Daxue xuebao · 2007
Based on the investigation of inter-cell interference in Time Division Duplex-Code Division Multiplex Accession(TDD-CDMA)system,a novel scheme named multi-cell multi-user detection is proposed to cancell the interference.This scheme defines an extended cell including a desired cell and six adjacent cells.High layer transmits parameters of all the accessing users in an extended cell to base station.The severe interferece is judged according to the power of pilot.The scrambling codes and channelisation codes of interfering users are judged according to the received power of the pilot sequences.The received power is also used to estimate the channel characteristics of desired users and interfering users and then to estimate the data of desired users and interfering users using multi-user detection.This scheme cancels the adjacent interference by considering them as multi-accessing interference,and therefore improves the performance of the system.