TY - JOUR
T1 - Multi-Ring Time Shifted Pilots for Full-Duplex Massive MIMO Systems
AU - Hua, Yun Kuei
AU - Chang, Wenson
N1 - Funding Information:
Manuscript received June 6, 2019; accepted June 28, 2019. Date of publication July 9, 2019; date of current version December 6, 2019. This work was supported by Qualcomm Technologies, Inc., under Research Collaboration Agreement NAT-408931. The associate editor coordinating the review of this paper and approving it for publication was S. Yang. (Corresponding author: Wenson Chang.) The authors are with the Department of Electrical Engineering, National Cheng Kung University, Tainan 70101, Taiwan (e-mail: [email protected]; [email protected]). Digital Object Identifier 10.1109/LWC.2019.2927566 Fig. 1. Time-slot arrangement for the MR-TSP scheme with coherent interval Tc = 20Ts and the number of ring rmax = 4, where the triple (P, D, U) = (3, 9, 8) represents the number of time slots allocated to pilot, downlink and uplink phases; Ts represents symbol duration.
Publisher Copyright:
© 2012 IEEE.
PY - 2019/12
Y1 - 2019/12
N2 - The time shifted pilots (TSP) is a well-known countermeasure against the pilot contamination problem in the massive multiple input and multiple output (MIMO) systems. Recently, two performance enhancement schemes evolved from TSP were developed on top of the single- and two-ring cell structures. In this letter, we aim to answer the puzzle of how to decide the number of rings [denoted by ( {r_{\max }} )] and arrange the time slots for pilot, downlink and uplink transmissions [denoted by the triple ( {P} , {D} , {U} )] on top of the multi-ring (MR) cell structures. To this end, we develop a general MR-TSP scheme by dividing a cell into multiple rings and allocating non-overlapped time-slots to different rings for transmitting pilots. Moreover, similar to the conventional TSP scheme, the same time slots can still be shared with cells belonging to different groups. Based on the findings from the numerical results, we develop a principle for deciding {r_{\max }} and ( {P} , {D} , {U} ) to meet various system configurations.
AB - The time shifted pilots (TSP) is a well-known countermeasure against the pilot contamination problem in the massive multiple input and multiple output (MIMO) systems. Recently, two performance enhancement schemes evolved from TSP were developed on top of the single- and two-ring cell structures. In this letter, we aim to answer the puzzle of how to decide the number of rings [denoted by ( {r_{\max }} )] and arrange the time slots for pilot, downlink and uplink transmissions [denoted by the triple ( {P} , {D} , {U} )] on top of the multi-ring (MR) cell structures. To this end, we develop a general MR-TSP scheme by dividing a cell into multiple rings and allocating non-overlapped time-slots to different rings for transmitting pilots. Moreover, similar to the conventional TSP scheme, the same time slots can still be shared with cells belonging to different groups. Based on the findings from the numerical results, we develop a principle for deciding {r_{\max }} and ( {P} , {D} , {U} ) to meet various system configurations.
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U2 - 10.1109/LWC.2019.2927566
DO - 10.1109/LWC.2019.2927566
M3 - Article
AN - SCOPUS:85069931098
SN - 2162-2337
VL - 8
SP - 1567
EP - 1570
JO - IEEE Wireless Communications Letters
JF - IEEE Wireless Communications Letters
IS - 6
M1 - 8758363
ER -