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http://dx.doi.org/10.17662/ksdim.2022.18.2.027

Implementation of TDD LTE-Advanced Testbed adopted Dynamic Pre-coding for MU-MIMO  

Han, Sangwook (한양대학교 전자컴퓨터통신공학과)
Lee, Jeonghyeok (한양대학교 전자컴퓨터통신공학과)
Choi, Seungwon (한양대학교 전자컴퓨터통신공학과)
Publication Information
Journal of Korea Society of Digital Industry and Information Management / v.18, no.2, 2022 , pp. 27-37 More about this Journal
Abstract
In this paper, we presents a Multiple User Multiple Input Multiple Output (MU-MIMO) test-bed system for Time Division Duplex (TDD) Long Term Evolution-Advanced (LTE-A). Using two parameters, the condition number of the channel matrix and the path gain, the MU-MIMO system could switch pre-coder to maintain target Bit Error Rate (BER) level. This paper also introduces a calibration procedure for compensating error of Radio Frequency (RF) paths of the antennas and RF transceivers. From experimental measurements, dynamic pre-coding scheme could maintain target BER, set to 10-3, with the pre-coder set configured with Zero Forcing (ZF), Tomlinson Harashima Pre-coding (THP), Lattice Reduction (LR). The simplest pre-coder ZF is adopted in stable channel, and when path gain become less than 0.25, LR is adopted. Lastly, when condition number of channel matrix become larger than 7, THP is adopted.
Keywords
Dynamic pre-coding; MU-MIMO; LTE-A; Calibration; System implementation;
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