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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Petit, M. Springer, A. |
| Copyright Year | 2002 |
| Abstract | In modern wireless communication devices, cost- and area-effective signal processing architectures are essential. Flexible and reconfigurable front-end solutions are necessary to achieve high-spectral efficiency. Direct conversion transceivers are suitable but have to deal with I/Q mismatch, for which large bandwidths become frequency selective. Blind I/Q mismatch compensation can be based on a statistical property called properness, which is fulfilled for a large class of digitally modulated communication signals and which is destroyed by I/Q mismatch. We propose a novel DSP-algorithm for blind adaptive I/Q mismatch compensators using only real-valued filters, which rebuilds this properness in two stages. Additionally, we add a simple compensation solution for dc offset which can be integrated in the I/Q mismatch compensator. In a detailed analysis, we prove that nonlinear even-order distortions resulting from finite mixer isolation have only negligible influence on properness under realistic impairment levels. A stability analysis exhibit conditions of those compensator parameter regions for which the optimal steady-state is asymptotically stable. For practical frequency-independent I/Q mismatch values, we show that the algorithm converges with a suitable initial value to the optimum steady state. The proposed algorithm outperforms other state-of-the-art algorithms while its computational complexity is reduced. Results from a 3GPP LTE downlink simulator support the analysis. |
| Starting Page | 781 |
| Ending Page | 793 |
| Page Count | 13 |
| File Size | 1486812 |
| File Format | |
| ISSN | 15361276 |
| Volume Number | 15 |
| Issue Number | 1 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2016-01-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Mixers Frequency dependence Baseband Wireless communication OFDM Receivers Algorithm design and analysis stability analysis I/Q mismatch circular random signals Long Term Evolution direct conversion transceiver second order statistics blind adaptive filtering long-term evolution |
| Content Type | Text |
| Resource Type | Article |
| Subject | Applied Mathematics Electrical and Electronic Engineering Computer Science Applications |
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