| Autor: |
SONG Tie-cheng, YOU Xiao-hu, SHEN Lian-feng, SONG Xiao-jin |
| Jazyk: |
čínština |
| Rok vydání: |
2007 |
| Předmět: |
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| Zdroj: |
Tongxin xuebao, Pp 23-28 (2007) |
| Druh dokumentu: |
article |
| ISSN: |
1000-436X |
| Popis: |
A combined channel estimation method of time-frequency-selective fading channels in MIMO-OFDM systems was proposed.The time-varying channel was modeled as an autoregressive（AR） process and a low-dimensional Kalman filter based on pilots was used to estimate the AR parameters,and the LS（least square） algorithm was adopted to track the time-varying channel fading factors.The Kalman estimator explored the time-domain correlation of the channel,and a minimum mean square error（MMSE） combiner was used to modify the Kalman estimates.The proposed solution could reduce the complexity of the high-dimensional Kalman filter and track the channel both in frequency and time domains.The simulation results show that this method improves the LS estimates and has a comparable performance to the com-plex high-dimensional Kalman channel estimation method. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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