Title | A technique for DC-offset removal and carrier phase error compensation in integrated wireless receivers |
Publication Type | Conference Paper |
Year of Publication | 2003 |
Authors | Shang, S., S. Mirabbasi, and R. Saleh |
Conference Name | Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on |
Pagination | I-173 - I-176 vol.1 |
Date Published | may. |
Keywords | 1/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 |
Abstract | 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. |
URL | http://dx.doi.org/10.1109/ISCAS.2003.1205528 |
DOI | 10.1109/ISCAS.2003.1205528 |