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Investigation of channelizer performance to synchronize uncoordinated future LTE uplink system
Alam, S.M. Shibbir
harris, fredric jNagaraj, SantoshKassegne, Samuel
xiii, 69 pages) : illustrations (some color).
Standard LTE system follows random access procedure to coordinate uplink transmission from mobile to base station. The users are at different distances from the cell site and all the signals must arrive at the same time at the cell site for proper demodulation. The cell site performs the reverse control to tell the users to advance or retard their transmission time depending on their distance from the base station so that all the signals can arrive at the same time. Demand for mobile wireless services continues to explode and in future wireless communications, the network capacity will be increased many times over the current capacity and there will be many more users competing for resources. Current coordination process in the standard LTE uplink system may not be effective to handle future wireless communication system. This thesis proves that implementing polyphase channelizer at the base station provides more efficient way of synchronization eliminating the need of time alignment procedure. Each channel of the channelizer is independent of each other and the occupied signals in different channelizer channels can be demodulated separately without affecting other channels. We have investigated channelizer performance to demodulate both narrow and wide band signals in the LTE uplink system and it is demonstrated that even though the narrow or wide band OFDM signals arrive at the cell site with timing or frequency offset or different channel gains, they can be demodulated independently from different channelizer bins without breaking the orthogonality.
Electrical and Computer Engineering
Master of Science (M.S.) San Diego State University, 2016
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