Journal on Communications ›› 2018, Vol. 39 ›› Issue (7): 92-102.doi: 10.11959/j.issn.1000-436x.2018120

• Papers • Previous Articles     Next Articles

Effects and optimization of pilot sequence length on rate in multiuser massive MIMO FDD system

Yi WANG1,2(),Pengge MA1,Kaizhi HUANG2,Chunguo LI3,Yongming HUANG3,Lyuxi YANG3   

  1. 1 School of Electronics and Communication Engineering,Zhengzhou University of Aeronautics,Zhengzhou 450046,China
    2 National Digital Switching System Engineering and Technological Research Center,Zhengzhou 450002,China
    3 School of Information Science and Engineering,Southeast University,Nanjing 210096,China
  • Revised:2018-05-25 Online:2018-07-01 Published:2018-08-08
  • Supported by:
    The National Natural Science Foundation of China(61372101);The National Natural Science Foundation of China(61671144);The National Natural Science Foundation of China(61701538);The National Natural Science Foundation of China(U1404615);Central Military Commission Advance Research Fund(6140311030207);China Postdoctoral Science Foundation Project(2018M633733);The Science and Technology Innovation Teams of Henan Province for Colleges and Universities(17IRTSTHN014);The Scientific and Technological Key Project of Henan Province(182102210449);The Key Project of Henan Province for Colleges and Universities(19A510024);The Natural Science Research Project of Jiangsu Province for Colleges and Universities(16KJB510008)

Abstract:

The effect of pilot sequence length on the asymptotic performance of the ergodic rate was investigated for the multiuser massive multiple-input multiple-output (MIMO) frequency division duplexing (FDD) downlink system.Firstly,the analytical expression of the ergodic rate was derived by using the principle of deterministic equivalence,based on which,it was discovered from the analytical results in two-fold that the normalized pilot sequence length (defined as the pilot sequence length divided by the number of BS antennas) tends to zero yet the rate was guaranteed to grow large without limit as long as the BS antenna number continues to increase,the rate saturates to a certain level if the BS antenna number becomes large with fixed pilot sequence length.Moreover,the pilot sequence length was optimized based on the sum-rate maximization within a finite channel coherence time,and a closed-form solution was deduced under a special correlated channel by means of Lambert W function.Simulation results validate the correctness of the theoretical analysis results and verify the effectiveness of the proposed closed-form solution of the optimal pilot sequence length.

Key words: massive MIMO, FDD, pilot sequence length, downlink rate, asymptotic analysis

CLC Number: 

No Suggested Reading articles found!