Theoretical Performance Analysis of an Image-Band Interference Canceller with Deterministic Imbalance Estimation

Satoshi DENNO  Ke LIU  Tatsuo FURUNO  Masahiro MORIKURA  

IEICE TRANSACTIONS on Communications   Vol.E94-B   No.4   pp.968-977
Publication Date: 2011/04/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.968
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
cognitive radio,  multimode,  multiband,  heterodyne reception,  image-band interference,  blind canceler,  I/Q imbalance,  

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It is known that a heterodyne multimode receiver implemented with a single RF (Radio Frequency) receiver suffers from image-band interference due to imbalance, i.e. the phase error and the gain imbalance of the RF Hilbert transformer. The blind image band interference canceler with deterministic imbalance estimation that has been proposed mitigates the image-band interference. This performance of the image-band interference canceler is analyzed theoretically in this paper. As a result, it is revealed that estimation accuracy of the deterministic imbalance estimation is improved slightly as the imbalance becomes greater. In addition, it is also shown that the deterministic estimation achieves better performance as the power of image-band interference increases. The performance is confirmed by computer simulation.