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ICC
2007
IEEE

Asynchronous Co-channel Interference Suppression in MIMO OFDM Systems

14 years 6 months ago
Asynchronous Co-channel Interference Suppression in MIMO OFDM Systems
— We present algorithms to suppress the asynchronous co-channel interference (CCI) in MIMO OFDM systems, which is becoming the dominant limiting factor in the performance of the emerging high-density WLANs. The key challenge is that the cyclic prefix of the interference signal does not line up with that of the intended signal due to asynchronous transmission in WLAN. Therefore, the orthogonality among the different tones of the interference signal is destroyed and conventional frequency domain minimum mean square error (MMSE) cancelation techniques that measure the interference channel response for each tone can not work effectively. To suppress the asynchronous interference, we design an efficient estimator to measure the interference spatial covariance matrix using Cholesky decomposition and lowpass smoothing. Both a MMSE and a maximum a posteriori (MAP) receiver are derived based on the estimated interference statistics. Simulation results demonstrate the effectiveness of our so...
Qiang Li, Jing Zhu, Xingang Guo, Costas N. Georghi
Added 02 Jun 2010
Updated 02 Jun 2010
Type Conference
Year 2007
Where ICC
Authors Qiang Li, Jing Zhu, Xingang Guo, Costas N. Georghiades
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