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4G systems like LTE (Long Term Evolution) provide an uplink data rate up to 80 Mbps, utilize higher order modulation (64-QAM) and introduce Space Division Multiple Access (SDMA) to improve spectral efficiency. These features pose stringent frequency and time synchronization requirements for the modem to guarantee satisfactory performance. This paper presents a simple yet robust scheme to estimate the frequency offset on a per user-basis at the eNodeB. The algorithm proposed utilizes a non-coherent method to provide frequency error estimation, hence decoupled from the channel estimator.
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