排序方式: 共有2条查询结果,搜索用时 0 毫秒
1
1.
A time and frequency synchronization scheme for multiuser OFDM 总被引:26,自引:0,他引:26
van de Beek J.-J. Borjesson P.O. Boucheret M.-L. Landstrom D. Arenas J.M. Odling P. Ostberg C. Wahlqvist M. Wilson S.K. 《Selected Areas in Communications, IEEE Journal on》1999,17(11):1900-1914
We present a multiuser synchronization scheme for tracking the mobile's uplink time and frequency offsets. It uses the redundancy introduced by the cyclic prefix and does not need additional pilots. We show performance results of an orthogonal frequency division multiplexing (OFDM)-based radio interface based on the universal mobile telecommunication system (UMTS) parameters. For a UMTS-typical mobile channel environment, the performance of a coherent system employing the scheme is virtually indistinguishable from the performance of a perfectly synchronized system. In a differentially modulated system, synchronization errors decrease the system performance by about 0.7 dB compared to a perfectly synchronized system 相似文献
2.
Symbol time offset estimation in coherent OFDM systems 总被引:1,自引:0,他引:1
Landstrom D. Wilson S.K. van de Beek J.-J. Odling P. Borjesson P.O. 《Communications, IEEE Transactions on》2002,50(4):545-549
This paper presents a symbol time offset estimator for coherent orthogonal frequency division multiplexing (OFDM) systems. The estimator exploits both the redundancy in the cyclic prefix and available pilot symbols used for channel estimation. The estimator is robust against frequency offsets and is suitable for use in dispersive channels. We base the estimator on the maximum-likelihood estimator for the additive white Gaussian noise channel. Simulations for an example system indicate a system performance as close as 0.6 dB to a perfectly synchronized system 相似文献
1