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All-Digital Transmitter With a Mixed-Domain Combination Filter

Cordeiro, R. ; Oliveira, A. ; Vieira, J.

IEEE Transactions on Circuits and Systems II: Express Briefs Vol. 63, Nº 1, pp. 4 - 8, January, 2016.

ISSN (print): 1558-3791
ISSN (online): 1549-7747

Journal Impact Factor: 1,136 (in 2015)

Digital Object Identifier: 10.1109/TCSII.2015.2483198

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Abstract
In this brief,we present a new reconfigurable filtering
technique for all-digital transmitters using signal interference and
cancellation. The proposed method allows the change of some
filtering characteristics digitally. This technique is used to reduce
the quantization noise from the all-digital transmitter’s output,
reducing the analog output filter requirements.Without a narrow
band filter, a greater degree of flexibility for the transmitter’s carrier
frequency and bandwidth is attained, improving its suitability
for multiband and multistandard operation. The results show
the quantization noise reduction without an output analog filter,
contributing to an increase of the transmitter’s coding efficiency
up to more than 95%.