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

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

Junghwa BAE
Jinwoo PARK

Publication
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
Keyword:
I/Q mismatch, I/Q imbalance, OFDM, direct-conversion receiver, null-carriers,

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Summary:
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.