Performance Analysis of Ranging Process in IEEE 802.16e OFDMA Systems
WIMOB '07 Proceedings of the Third IEEE International Conference on Wireless and Mobile Computing, Networking and Communications
Novel OFDMA Uplink Initial Ranging Scheme for IEEE 802.16e
ICIE '09 Proceedings of the 2009 WASE International Conference on Information Engineering - Volume 01
A new ranging method for OFDMA systems
IEEE Transactions on Wireless Communications
| Hi-index | 0.00 |
In this paper, an enhanced accumulative differential detection based ranging algorithm is presented, which is generally used to achieve uplink synchronization of orthogonal frequency division multiple access (OFDMA) based fixed wireless communication system. A conventional accumulative differential detection method has the advantage of suppressing noise variance, by using numerous sub-carrier pairs which have multiple tone spaces to estimate the uplink timing offset. However, the estimated values are subject to a sign error caused by noise and the channel mismatch between sub-carriers. In order to overcome this problem, we propose a novel accumulative differential detection method. The proposed method applies a simple sign comparison rule to each estimated value for correcting the sign error. After that, the corrected values are normalized by corresponding weighting values calculated by channel correlation and noise variance. Various simulation results verify that the proposed method has superior performance compared with the conventional algorithm.