標題: Cross-Validation Estimation for Frequency-Dependent I/Q Imbalance in MIMO-OFDM Receivers
作者: Lai, Wei-Chi
Juan, Ta-Yang
Hsu, Terng-Yin
Chiou, Sheng-Lun
資訊工程學系
Department of Computer Science
關鍵字: Filter mismatch;I/Q imbalance;Cross validation;Frequency-Dependent Imbalance (FDI);MIMO-OFDM
公開日期: 1-七月-2010
摘要: The effects of variation in RF, such as I/Q imbalance and filter mismatch, are extremely important for OFDM wireless accesses. This work presents a low-computational estimation of I/Q imbalances with filter mismatches to improve performance in MIMO-OFDM receivers. For N x N MIMO-OFDM systems, the proposed cross-validation estimation is such that, only N + 1 preambles are required to extract the mismatches of filters, gains and phases. With the estimated parameters, frequency-domain filters are exploited to correct frequency-dependent I/Q imbalances. Through performance evaluation of a 2 x 2 MIMO-OFDM system, with ideal channel estimations this study incurs a SNR loss of 1-1.2 dB to maintain a 10% PER at 1-dB gain error, 10A degrees-phase error and the worst 180A degrees-filter mismatch. In addition, this algorithm is well-matched to IEEE 802.11n and new specifications discussed in IEEE 802.11 VHT study group.
URI: http://dx.doi.org/10.1007/s11265-009-0403-y
http://hdl.handle.net/11536/5233
ISSN: 1939-8018
DOI: 10.1007/s11265-009-0403-y
期刊: JOURNAL OF SIGNAL PROCESSING SYSTEMS FOR SIGNAL IMAGE AND VIDEO TECHNOLOGY
Volume: 60
Issue: 1
起始頁: 59
結束頁: 70
顯示於類別:期刊論文


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