In up-to-date receiver architectures the gain and phase mismatch between the I and Q signal paths may degrade significantly the overall link performance. An alternative cost effective solution to expensive analog components with small tolerances, which make the I/Q mismatch effect negligible, consists in estimating and compensating it through appropriate digital signal processing techniques. In this paper we derive a novel low-complexity data-aided scheme for jointly estimating the carrier phase offset, the I/Q phase mismatch, and the gain of the I and Q branches following the maximum likelihood criterion and adopting as training symbols an orthogonal sequence. The performance analysis proves that the proposed estimator is low-complexity, asymptotically efficient and capable of compensating considerable I/Q mismatch values in the demanding scenario of both uncoded and coded multi-level QAM transmissions.
|Titolo:||Low-Complexity Gain And Phase IQ Mismatch Compensation using orthogonal pilot sequences|
LOTTICI, VINCENZO (Co-primo)
LUISE, MARCO (Co-primo)
|Anno del prodotto:||2006|
|Appare nelle tipologie:||4.1 Contributo in Atti di convegno|