A technique for DC-offset removal and carrier phase error compensation in integrated wireless receivers

TitleA technique for DC-offset removal and carrier phase error compensation in integrated wireless receivers
Publication TypeConference Paper
Year of Publication2003
AuthorsShang, S., S. Mirabbasi, and R. Saleh
Conference NameCircuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on
PaginationI-173 - I-176 vol.1
Date Publishedmay.
Keywords1/f noise, AC coupling, baseline wander effect, carrier phase error compensation, circuit feedback, DC offset removal, direct-conversion receiver, error compensation, integrated wireless receiver, local oscillator, monolithic architecture, quadrature amplitude modulation, quantized feedback technique, radio receivers

Integrated wireless receiver architectures such as direct-conversion receivers offer performance advantages over the conventional heterodyne-based receivers in terms of power consumption, size and implementation cost. The use of these monolithic receivers, however, has been limited mainly due to low-frequency disturbances, namely, DC-offset and 1/f noise (particularly in CMOS implementations). AC-coupling is a cost-effective method to minimize these low-frequency disturbances, but results in baseline wander effects, especially in spectrally efficient modulation schemes such as quadrature amplitude modulation (QAM) whose baseband signal spectrum contains a significant amount of energy near DC. In this work, the quantized feedback (QFB) technique is used to mitigate the baseline wander effect. The QFB block is extended to a complex (in mathematical sense) system that also compensates for carrier phase errors in the receiver local oscillator (LO). Simulation results demonstrate the effectiveness of this complex QFB technique.


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