Research On Low Complexity ICI Cancellation Technology In GFDM

With the increasing application of wireless communication technology,the requirements of this technology is getting higher and higher,then 5G came into being.As a promising 5G candidate,GFDM has recently received a great deal of attention.It overcomes the limitations of OFDM while preserving most of the advantages of it.Since the non-orthogonal characteristic of GFDM,the inherent ICI is generated due to the inherent non-orthogonality of the subcarriers because of the use of the RC pulse shaping.Meantime,when the GFDM transmission signal through the wireless channel there is also ICI generated.So GFDM system faces severe ICI problem which directly restricts the development of GFDM.In order to meet the requirements of low power consumption and low complexity in 5G application scenario M2M,first,we propose a low complexity ICI cancellation scheme based on the propinquity of ICI amplitude between adjacent subcarriers in GFDM.The key idea of the proposed scheme is that selecting odd subcarriers to transmit data and even subcarriers to transmit 0,so the ICI is reduced without interfering with adjacent subcarriers,and its system model is designed,then its superiority of BER and PAPR performance is verified by computer simulation.Since the proposed scheme selects some subcarriers to transmit data,it has the characteristics of low power consumption and low complexity.In addition,IM has the potential to provide a flexible system design with adjustable number of active subcarriers as well as significant BER performance improvement in Rayleigh multipath channel for multicarrier systems.Then,in order to improve GFDM system performance under the channel,we propose a combined application of IM and GFDM low complexity ICI cancellation algorithm,present its system model.Then we verify its BER performance under the channel by comparing GFDM and its SIC algorithm at the same spectral efficiency.It is shown via computer simulations that,the proposed system achieves significantly better error performance than classical GFDM and its existing SIC algorithm which can be explained by the improved average Euclidean distance spectrumby no-load partial subcarriers due to the introduction of the IM.