I/Q Imbalance Compensation Using Null-Carriers in OFDM Direct-Conversion Receiver

Junghwa BAE  Jinwoo PARK  

IEICE TRANSACTIONS on Communications   Vol.E89-B   No.8   pp.2257-2260
Publication Date: 2006/08/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.8.2257
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
I/Q mismatch,  I/Q imbalance,  OFDM,  direct-conversion receiver,  null-carriers,  

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This letter proposes a compensation method that can alleviate the problem of I/Q mismatch generated in the direct-conversion receiver of OFDM systems. In the proposed method, the amount of I/Q mismatch is estimated using null-carriers in transmitted signals, and it is subtracted from received symbols to suppress I/Q mismatch effects. Simulations show experiments that the proposed method can effectively eliminate the I/Q mismatch effects.