Multipath Channel Models for Wireless Local and Metropolitan Area Networks
ICITA '05 Proceedings of the Third International Conference on Information Technology and Applications (ICITA'05) Volume 2 - Volume 02
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Ranging process is proposed for the coordination between mobile station and base station in IEEE 802.16e OFDMA systems. It consists of ranging detection process (RDP), uplink resource allocation, and registration. Among them, RDP is the first step of ranging process and the core of wireless access algorithm in IEEE 802.16e OFDMA systems. Thus, it is essential to analyze the performance of RDP to study wireless access of IEEE 802.16e OFDMA systems. In RDP, MS transmits randomly selected CDMA ranging codes to BS and BS conducts the code identification and uplink time synchronization. This process is based on the cross-correlation property of CDMA codes. However, it is prone to be affected by channel characteristics in the multipath fading channel. Moreover, it is influenced by number of interfering users and signal to noise ratio (SNR) as well. Therefore, RDP analysis should consider channel characteristics, interference, and SNR, simultaneously. In this paper, we mathematically analyzed RDP performance. The probability density function of the received signal is induced to obtain ranging success probability (RSP) under various channel environments. And this analysis is expanded to an enhanced ranging detection algorithm which was suggested by our past study.