In recent years, secure, reliable and high speed data transmission have become key elements for cooperative based communication systems. Conventional communication methods are no longer sufficiently fulfilling the demands of next generation communication systems. In this paper, in order to establish communication between sensor nodes with the 3GPP LTE standard and achieve better communication values in terms of low Signal to Noise Ratio (SNR) regimes, four different Multi-Carrier modulation scenarios were investigated for relay network configuration of Wireless Sensor Networks' (WSNs) Physical Layer (PHY). Orthogonal Frequency Division Multiple Access (OFDMA) and Single Carrier Frequency Division Multiple Access (SC-FDMA) modulation techniques were selected due to their wide usage areas in broadband wireless communication as LTE. Optimal simulation results were achieved when the SC-FDMA was employed for all relay network configurations.