Advisor(s)

David P. Brady

Contributor(s)

Milica Stojanovic, Masoud Salehi

Date of Award

2008

Date Accepted

10-2008

Degree Grantor

Northeastern University

Degree Level

Ph.D.

Degree Name

Doctor of Philosophy

Department or Academic Unit

College of Engineering. Department of Electrical and Computer Engineering.

Keywords

Electrical and computer engineering, I/Q imbalance correction

Subject Categories

Integrated circuits--Design and construction, Integrated circuits--Reliability

Disciplines

Engineering

Abstract

Most modern integrated circuit transceivers, especially wireless LAN, utilize a direct conversion radio architecture. While this approach is highly advantageous from the perspectives of cost and flexibility, there exist several performance impairments, including gain and phase imbalances between the in-phase (I) and quadrature (Q) of a transmitter (TX) or receiver (RX). The dissertation presents several signal processing methodologies for compensation of I/Q imbalance for a direct conversion packet-switched OFDM communications system, whichl accounts for TX I/Q imbalance, RX I/Q imbalance, phase/frequency error, and dispersive multipath fading. Both frequency dependent I/Q imbalance and frequency independent cases are considered, covering both m00hvch1 j,lk and narrowband modulation. The proposed estimation algorithms operate within the fully compliant framework of existing multi-user OFDM radio standards (802.11a). It is shown that these algorithms accurately estimate and correct transceiver I/Q imbalance on a packet-by-packet basis, all within the RX's digital baseband.

Document Type

Dissertation

Rights Holder

Jeffrey Ross Feigin


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