DocumentCode :
2106676
Title :
Digital front-end design for carrier aggregation in next-generation cellular user equipment
Author :
Kroll, Harald ; Belfanti, Sandro ; Vogel, P. ; Bettini, Luca ; Benkeser, Christian ; Qiuting Huang
Author_Institution :
Integrated Syst. Lab., ETH Zurich, Zurich, Switzerland
fYear :
2013
fDate :
8-11 Dec. 2013
Firstpage :
873
Lastpage :
876
Abstract :
Carrier aggregation (CA) in latest 4G standards and beyond demands either multiple narrow-band RX branches or a single wide-band RX branch followed by efficient channelizer architectures in the digital front-end (DFE). The small number of simultaneously received component carriers favors the use of a single wide-band ADC in conjunction with a per-channel carrier extraction. However, the computational complexity of the digital extraction is high due to the mixing operation for each of the aggregated carriers. In this work, we show how the complexity of the per-channel approach can be reduced by employing DFE architectures using cascaded integrator comb (CIC) based filter stages. Promoting a joint configuration approach for the ADC and subsequent filter stages, the different low-complexity filter architectures are analyzed, evaluated and compared. By an LTE-Advanced non-contiguous CA design example, the feasibility of the addressed designs is demonstrated and the approach with the best performance-complexity trade-off is identified.
Keywords :
4G mobile communication; Long Term Evolution; analogue-digital conversion; mixing; next generation networks; 4G standards; CA design; CIC based filter stages; DFE architectures; LTE-Advanced; carrier aggregation; cascaded integrator comb; channelizer architectures; digital front-end design; low-complexity filter architectures; mixing operation; narrow-band RX branches; next-generation cellular user equipment; noncontiguous CA design; perchannel carrier extraction; single wide-band ADC; single wide-band RX branch; Computational complexity; Computer architecture; Decision feedback equalizers; Mixers; OFDM; Receivers;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electronics, Circuits, and Systems (ICECS), 2013 IEEE 20th International Conference on
Conference_Location :
Abu Dhabi
Type :
conf
DOI :
10.1109/ICECS.2013.6815553
Filename :
6815553
Link To Document :
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