Analysis and Simulation Study Based on Cyclic Prefix

With the development of wireless technology, wireless network bandwidth is increasingly high require.OFDM modulation technique can be used to more fully utilize the available bandwidth.The paper studied the important role of the cyclic prefix in OFDM.We get the simulation figure when delay spread exceeds the cyclic prefix.Simulation results show that when cyclic prefix accounted 20%,the power loss is less than l dB,and information rate loss of up to 20%.But inserting a cyclic prefix can eliminate the influence of the inter-carrier caused by the inter-symbol interference and the inter-carrier caused by multipath interference.