Low-complexity estimation of CFO and frequency independent I/Q mismatch for OFDM systems
Chen, Ying, Zhang, Jian (Andrew), & Jayalath, Dhammika (2009) Low-complexity estimation of CFO and frequency independent I/Q mismatch for OFDM systems. EURASIP Journal on Wireless Communications and Networking, 2009, pp. 1-11.
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CFO and I/Q mismatch could cause significant performance degradation to OFDM systems. Their estimation and compensation are generally difficult as they are entangled in the received signal. In this paper, we propose some low-complexity estimation and compensation schemes in the receiver, which are robust to various CFO and I/Q mismatch values although the performance is slightly degraded for very small CFO. These schemes consist of three steps: forming a cosine estimator free of I/Q mismatch interference, estimating I/Q mismatch using the estimated cosine value, and forming a sine estimator using samples after I/Q mismatch compensation. These estimators are based on the perception that an estimate of cosine serves much better as the basis for I/Q mismatch estimation than the estimate of CFO derived from the cosine function. Simulation results show that the proposed schemes can improve system performance significantly, and they are robust to CFO and I/Q mismatch.
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|Item Type:||Journal Article|
|Subjects:||Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000) > COMMUNICATIONS TECHNOLOGIES (100500) > Wireless Communications (100510)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering|
Past > Schools > School of Engineering Systems
|Copyright Owner:||Copyright 2009 Hindawi Publishing|
|Deposited On:||16 Jul 2009 15:35|
|Last Modified:||29 Feb 2012 23:54|
Available Versions of this Item
- Low-complexity estimation of CFO and frequency independent I/Q mismatch for OFDM systems. (deposited 05 Jun 2009 13:55)
- Low-complexity estimation of CFO and frequency independent I/Q mismatch for OFDM systems. (deposited 16 Jul 2009 15:35)[Currently Displayed]
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