Analysis Of Interference Reduction In Mc-Cdma System Using Binary Spreading Sequences

In this paper, we explore the effects of various spreading codes chiefly GMW, WG and 3term sequences on interference levels in the multicarrier code-division multiple access (MC-CDMA) system. We evaluate the performances of these codes in terms of interference cancellation in differentsubcarrier systems. In the system, the data from the user is spreaded using a special sequence (code). The spreaded data is transmitted using the orthogonal frequency division multiplexing (OFDM) notioni.e., the data is transmitted simultaneously via numerous subcarriers. The orthogonality among the subcarriers further reduces the interference level. Simulation results show that 3-term sequence performs better than other spreading sequences. Based on the simulations, we propose that 3-term sequence can be used as the spreading code in higher order subcarrier systems for mitigating interference and achieving a better bit error rate (BER) performance.