A novel OFDMA ranging method exploiting multiuser diversity
IEEE Transactions on Communications
Initial ranging for WiMAX (802.16e) OFDMA
MILCOM'06 Proceedings of the 2006 IEEE conference on Military communications
A comparison of pilot-aided channel estimation methods for OFDMsystems
IEEE Transactions on Signal Processing
A robust timing and frequency synchronization for OFDM systems
IEEE Transactions on Wireless Communications
A new ranging method for OFDMA systems
IEEE Transactions on Wireless Communications
Optimal Power/Rate Allocation and Code Selection for Iterative Joint Detection of Coded Random CDMA
IEEE Transactions on Information Theory
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In this letter, we propose a successive multiuser detector (SMUD) for contention based OFDMA ranging channel compliant to the IEEE 802.16 (WiMAX) standard. A ranging channel consists of a set of subcarriers in specific time slots shared by multiple users, so the multiple access interference (MAI) limits the performance of ranging detectors. Different from existing methods that treat the MAI as noise, the proposed SMUD successively detects the channel paths of active ranging signals and cancels their interference for further detection. This approach significantly suppresses the MAI and improves both user detection and parameter estimation performance.