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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IEEE Communications Magazine
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In this paper we analyzed random access process of single carrier FDMA (SC-FDMA) system, which is one of uplink candidates in 3GPP long term evolution. In random access process each user equipments (UE) transmits randomly selected random access code and the Node B detects each UE's random access try by code identification. It is conducted by exploiting the cross-correlation property of random access code. Moreover, round trip time (RTT) is also estimated during random access detection process for uplink time synchronization utilizing the auto-correlation of random access code. This paper proposed random access detection scheme which adopts the frequency domain RTT estimation and the time domain code identification. The performance of random access of SC-FDMA system highly depends on correlation properties. However, they are susceptible to channel characteristics in the multipath fading channel environments. Thus, this paper analyzed the performance of random access in the multipath fading channel. Results of our analysis will be beneficial as the guideline in designing SC-FDMA based random access system.