Enhanced Spatial Covariance Matrix Estimation for Asynchronous Inter-Cell Interference Mitigation in MIMO-OFDMA System 


Vol. 34,  No. 5, pp. 527-539, May  2009


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  Abstract

In this paper, we propose an asynchonous ICI (Inter-Cell Interference) mitigation techniques for 3GPP LTE MIMO-OFDMA down-link receiver. An increasing in symbol timing misalignments may occur relative to sychronous network as the result of BS (Base Station) timing differences. Such symbol synchronization errors that exceed the guard interval or the cyclic prefix duration may result in MAI (Multiple Access Interference) for other carriers. In particular, at the cell boundary, this MAI becomes a critical factor, leading to degraded channel throughput and severe asynchronous ICI. Hence, many researchers have investigated the interference mitigation method in the presence of asynchronous ICI and it appears that the knowledge of the SCM (Spatial Covariance Matrix) of the asynchronous ICI plus background noise is an important issue. Generally, it is assumed that the SCM estimated by using training symbols. However, it is difficult to measure the interference statistics for a long time and training symbol is also not appropriate for MIMO-OFDMA system such as LTE. Therefore, a noise reduction method is required to improve the estimation accuracy. Although the conventional time-domain low-pass type weighting method can be effective for noise reduction, it causes significant estimation error due to the spectral leakage in practical OFDM system. Therefore, we propose a time-domain sinc type weighing method which can not only reduce the noise effectively minimizing estimation error caused by the spectral leakage but also implement frequency-domain moving average filter easily. By using computer simulation, we show that the proposed method can provide up to 3㏈ SIR gain compared with the conventional method.

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  Cite this article

[IEEE Style]

J. Moon, J. Jang, J. Han, S. Kim, Y. Kim, H. Choi, "Enhanced Spatial Covariance Matrix Estimation for Asynchronous Inter-Cell Interference Mitigation in MIMO-OFDMA System," The Journal of Korean Institute of Communications and Information Sciences, vol. 34, no. 5, pp. 527-539, 2009. DOI: .

[ACM Style]

Jong-Gun Moon, Jun-Hee Jang, Jung-Su Han, Sung-Soo Kim, Yong-Serk Kim, and Hyung-Jin Choi. 2009. Enhanced Spatial Covariance Matrix Estimation for Asynchronous Inter-Cell Interference Mitigation in MIMO-OFDMA System. The Journal of Korean Institute of Communications and Information Sciences, 34, 5, (2009), 527-539. DOI: .

[KICS Style]

Jong-Gun Moon, Jun-Hee Jang, Jung-Su Han, Sung-Soo Kim, Yong-Serk Kim, Hyung-Jin Choi, "Enhanced Spatial Covariance Matrix Estimation for Asynchronous Inter-Cell Interference Mitigation in MIMO-OFDMA System," The Journal of Korean Institute of Communications and Information Sciences, vol. 34, no. 5, pp. 527-539, 5. 2009.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880