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EnglishIn I/Q receivers characterized by direct conversion or low-IF operations, phase imbalance between the I and Q branches stands for a substantial issue which may degrade significantly the overall link performance. An alternative solution to high cost analog components with small tolerances which make the I/Q imbalance effect negligible is to estimate and compensate it digitally. In this paper we present a novel data aided (DA) joint estimator of the carrier phase offset and the I/Q phase imbalance derived following the maximum likelihood (ML) criterion. The performance accuracy analysis proves that the proposed estimator is efficient and achieves its vector Cramer-Rao lower bound (VCRLB). Simulation results in terms of BER performance of uncoded and turbo coded systems show that the proposed imbalance compensation method, at the cost of a low additional implementation complexity of the digital receiver, allows negligible performance degradation in the context of multi-level modulation formats, such as 16-QAM and 64-QAM.
| Titolo: | Efficient Compensation of I-Q Phase Imbalance for Digital Receivers |
| Autori interni: | LOTTICI, VINCENZO (Co-primo) LUISE, MARCO (Co-primo) |
| Anno del prodotto: | 2005 |
| Handle: | http://hdl.handle.net/11568/201599 |
| ISBN: | 0-7803-8938-7 |
| Appare nelle tipologie: | 4.1 Contributo in Atti di convegno |
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