A New Approach for Improving Performance of Localized SC-FDMA LTE Uplink

Abstract

Single Carrier Frequency Division Multiple Access (SC-FDMA) is an uplink communication standard for 3GPP (Third Generation Partnership Project) Long Term Evolution (LTE), which outperforms multicarrier systems due to its low Peak to Average Power Ratio (PAPR). The Volterra equalizer is a nonlinear advanced technique for improving data transmission system efficiency. It enhances noise at high frequencies and it is extremely sensitive to noise. This paper proposes a modified Volterra equalization technique to improve the performance of Localized Single Carrier Frequency Division Multiple Access (LFDMA). The modified Volterra equalizer is a combination of Volterra equalizer and Decision Feedback Equalizer (DFE) which reduces noise efficiently. Furthermore, the modified Volterra equalizer reduces computational complexity more effectively than the existing equalizers. Simulation results show that the modified Volterra equalizer provides improved Bit Error Rate (BER) performance compared to Zero Forcing (ZF) and Minimum Mean Square Error (MMSE) equalizers. The simulation results yield BER of 10dB and 13 dB respectively for16QAM and 64QAM by using the proposed scheme.