A Multistage Decision-Feedback Receiver Design for LTE Uplink in Mobile Time-Variant Environments
Source: Hindawi Publishing
Single-Carrier-Frequency Division Multiple Access (SC-FDMA) has recently become the preferred uplink transmission scheme in Long-Term Evolution (LTE) systems. Similar to Orthogonal Frequency Division Multiple Access (OFDMA), SC-FDMA is highly sensitive to frequency offsets caused by oscillator inaccuracies and Doppler spread, which lead to Inter-Carrier Interference (ICI). This paper proposes a multistage decision-feedback structure to mitigate the ICI effect and enhance system performance in time-variant environments. Based on the block-type pilot arrangement of the LTE uplink type 1 frame structure, the Time-Domain Least Squares (TDLS) method and polynomial-based curve-fitting algorithm are employed for channel estimation.