Non-orthogonal Pilot Design and Analysis for CoMP Systems
In this paper, a non-orthogonal pilot scheme is proposed for the downlink of the coordinated multi-point (CoMP) systems to reduce the pilot overhead. Compared with the conventional orthogonal pilot schemes resulting in a heavy burden of the system along with the increasing number of transmit antennas, our proposed scheme doesn’t need the necessary orthogonality between different antennas’ pilot sequences. By exhaustively searching the non-orthogonal vectors over proper different unitary spaces, the optimal pilot sequences based on the criteria of minimal cross-correlation can be obtained for different antennas in CoMP systems. Analysis and simulations show that the proposed scheme provides a tradeoff between the accuracy of channel estimation and the total pilot overhead. In particular, when the number of cooperative transmitting antennas is large, our proposed scheme outperforms the orthogonal one at the same pilot overhead, with regard to available system capacity by linear beamforming.
MIMO Coordinated Multi-point Channel estimation Pilot
Zhang Xiujun Chen Xiang Zhou Shidong Wang Jing
Department of Electronic Engineering, Research Institute of Information Technology, Tsinghua Nationa Department of Electronic Engineering, Research Institute of Information Technology, Tsinghua Nationa
国际会议
南京
英文
1-5
2011-11-09（万方平台首次上网日期，不代表论文的发表时间）