Performance analysis of GFDMA and SC-FDMA in Rayleigh and Gaussian fading channel

OFDMA and SC-FDMA were chosen as strong candidates for uplink transmission in 3GPP-LTE. OFDMA is a full-fledged multicarrier modulation scheme but has the disadvantage of high PAPR. SC-FDMA achieves low PAPR by spreading the constellation points over entire bandwidth but lacks efficient spectral utilization and prone to Inter Carrier Interference (ICI) at cell edge. Grouped Frequency Division Multiple Access (GFDMA) is a modified version of SC-FDMA that combines SC-FDMA with IMD-FDE to provide multi-user detection capability. Unlike SC-FDMA, GFDMA suffers from Carrier Frequency Offset (CFO) that arises due to Multiple Access Interference (MAI). To select a transmission scheme that offers more resistance to adverse channel conditions and provide better performance, impact of CFO in GFDMA and SC-FDMA systems will be evaluated by channel estimation techniques under Rayleigh and Gaussian fading channels.