Estimation of Uplink Channel for Multi-user LTE System in High-Speed Environment
Keywords:Multi-user LTE, SC-FDMA, High-speed environment, Channel estimation, estimation updating algorithm.
AbstractThis paper presents a novel estimation technique for the uplink channel of long-term evolution (LTE) system in high-speed environment without increasing any spectral overhead. With high terminal velocity, the time-varying channels being encountered making its coherence time is small enough to be compared with symbol duration. Hence a severe degradation in estimation process is being registered with conventional frame structure of LTE system where pilot symbols are introduced in each 0.5ms. This paper has proposed a frequency domain estimation updating algorithm to track the time-varying channel parameters and generate updated estimates in each payload symbol without any additional spectral overhead. A significant improvement in system performance in high-speed environment is registered.
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