The recent demand for wireless transceivers has created a flurry of research into nontraditional
receiver architectures. The homodyne receiver, because of its high degree of
integration, low complexity and low power consumption, has surfaced a desirable alternative
to the well-known heterodyne receiver. However, distortions such as gain and phase
imbalance severely degrade the performance of the homodyne receiver. These imbalances,
which are caused by impairments of the employed analog devices, are intensified because
quadrature demodulation is performed at very high frequencies with a weak input signal.
Thus, there exists a great need for low complexity techniques to compensate for these
imbalances.
In this thesis, we present a new, simplified method for the estimation and the correction
of the gain and phase imbalances in a homodyne receiver. The estimation process is
based upon carrier re-injection during idle periods of the mobile unit and thus requires only
few additional analog components. This approach will be shown to yield tight estimates
of the gain and the phase error. Additionally, the correction is performed in the digital
domain and thus can be implemented on a digital signal processor. The effectiveness of
this method is demonstrated via simulations of an IS-54 transceiver. IS-54 is the North
American TDMA standard for dual-mode cellular systems. / Graduation date: 1998
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/33974 |
| Date | 06 April 1998 |
| Creators | Vogel, Julia |
| Contributors | Stonick, John T. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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