Article (Scientific journals)
Adaptive duplexing for transceivers supporting aggregated transmissions
Eslampanah, R.; Ahmed, S.; Williamson, M. et al.
2016In IEEE Transactions on Vehicular Technology, 65 (9), p. 6842-6852
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Keywords :
Adaptive duplexer; Cancelation; Least mean squares (LMS) algorithm; Pilot generator; Inverse problems; MIMO systems; Radio transceivers; Duplexers; Frequency division duplexing; Least mean squares algorithm; Normalized least mean square; Reduced complexity; Wide frequency range; Long Term Evolution (LTE)
Abstract :
[en] Wireless systems employing frequency-division duplexing (FDD) must use duplexing filters to isolate the sensitive receiver from its own strong transmission. The number of filters in the duplexer is equal to the total number of aggregated transmit and receive bands. These filters are nontunable; therefore, a separate duplexer is required for each combination of operating bands. This paper presents an adaptive duplexer architecture capable of handling more than one receiver channel and tunable over a wide frequency range. The structure uses a combination of a low-isolation device with multiple analog canceling loops controlled by a normalized least mean squares (N-LMS) algorithm to track changes in signal leakage. The control is a multiple-input-multiple-output (MIMO) problem. This paper shows that modeling the inverse plant can orthogonalize the problem and dramatically improve convergence times with reduced complexity over previous search algorithms. Low-power pseudonoise (PN) pilot signals are proposed to detect and cancel the transmitter noise. Simulations show that 50 dB of isolation is possible with 20-MHz Long-Term Evolution (LTE)-like channels. Convergence takes 80 iterations (10 ms) from cold or 15 iterations (1.5 ms) for changes in carrier frequency or antenna loading. © 2015 IEEE.
Disciplines :
Electrical & electronics engineering
Author, co-author :
Eslampanah, R.;  College of Engineering and Science, Victoria University, Melbourne, VIC 8001, Australia
Ahmed, S.;  College of Engineering and Science, Victoria University, Melbourne, VIC 8001, Australia
Williamson, M.;  College of Engineering and Science, Victoria University, Melbourne, VIC 8001, Australia
Redouté, Jean-Michel  ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Systèmes microélectroniques intégrés
Faulkner, M.;  College of Engineering and Science, Victoria University, Melbourne, VIC 8001, Australia
Language :
English
Title :
Adaptive duplexing for transceivers supporting aggregated transmissions
Publication date :
2016
Journal title :
IEEE Transactions on Vehicular Technology
ISSN :
0018-9545
Publisher :
Institute of Electrical and Electronics Engineers Inc.
Volume :
65
Issue :
9
Pages :
6842-6852
Peer reviewed :
Peer Reviewed verified by ORBi
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