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 |