ZTE Communications ›› 2018, Vol. 16 ›› Issue (2): 32-36.DOI: 10.3969/j.issn.1673-5188.2018.02.006

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Two-Codebook-Based Cooperative Precoding for TDD-CoMP in 5G Ultra-Dense Networks

GAO Tengshuang1, CHEN Ying2, HAO Peng3, ZHANG Hongtao2   

  1. 1. Tianjin University, Tianjin 300072, China
    2. Beijing University of Posts and Telecommunications, Beijing 100876, China
    3. Wireless Product R&D Institute, ZTE Corporation, Shenzhen 518057, China
  • Received:2018-03-05 Online:2018-06-25 Published:2019-12-12
  • About author:GAO Tengshuang (gaotengshuang@szhrss.gov.cn) received his M.S. degree in software engineering from Tianjin University, China in 2016. He is currently pursuing for Ph.D. degree in software engineering at Tianjin University. He has almost 12 years of experience in software engineering field, especially in interdisciplinary fields such as computing science applying in wireless communications.|CHEN Ying (destinyshore@bupt.edu.cn) received the bachelor’s degree in communication engineering from Beijing University of Posts and Telecommunications (BUPT), China in 2016. She is currently working toward the M. Tech. degree in communication and information engineering at the School of Information and Communication Engineering, BUPT. Her research interests include the emerging technologies of 5G wireless communication network.|HAO Peng (hao.peng@zte.com.cn) received his M.S. degree in communication engineering from Beijing University of Posts and Telecommunications, China. He joined ZTE Corporation in 2006 and worked on system and link level simulation of 4G system. He has also been involved in the research of physical layer key technologies of LTE and LTE-A system. He authored 70 3GPP proposals and more than 100 Chinese and international patents. His research interests include MIMO technologies and the design of interference mitigation algorithms. He is currently serving as a senior engineer of ZTE and in charge of the study of 5G ultra dense network.|ZHANG Hongtao (htzhang@bupt.edu.cn) received the Ph.D. degree in communication and information systems from Beijing University of Posts and Telecommunications (BUPT), China in 2008. He is currently an associate professor with the School of Information and Communications Engineering, BUPT. He has published more than 60 articles on international journals and conferences, and has filed more than 30 patents. He is the author of seven technical books. His research interests include 5G wireless communication and signal processing.


In ultra-dense networks (UDN), the local precoding scheme for time-division duplex coordinated multiple point transmission (TDD-CoMP) can have a good performance with no feedback by using reciprocity between uplink and downlink. However, if channel is time-varying, the channel difference would cause codeword mismatch between transmitter and receiver, which leads to performance degradation. In this paper, a linear interpolation method is proposed for TDD-CoMP system to estimate the uplink channel at the receiver, which would reduce the channel difference caused by time delay and decrease the probability of codeword mismatch between both sides. Moreover, to mitigate severe inter-cell interference and increase the coverage and throughput of cell-edge users in UDN, a two-codebook scheme is used to strengthen cooperation between base stations (BSs), which can outperform the global precoding scheme with less overhead. Simulations show that the proposed scheme can significantly improve the link performance compared to the global precoding scheme.

Key words: ultra-dense networks, coordinated multiple point transmission, time-division duplex, two codebooks, cooperative precoding