PB/MC-CDMA : A nobel modulation technique and multiple access scheme for broadband wireless communication

In the presence of frequency-selective multi path fading channels, Multi Carrier Code Division Multiple Access (MC-CDMA) suffers from multi-user interference (MUI) and inter-symbol interference (ISI). In this paper, the Partial Block MC-CDMA system was proposed and Performance of the system was analyzed. In the conventional MC-CDMA system, users are affected by MUI (multi-user experience) because all users use whole bandwidth. By the MUI, performance is degraded as the number of user increases. Furthermore, number of maximum user is limited to the length of spreading code. However, proposed system can increase the system performance by limiting MUI through assigning the users to the block-unit sub-carrier. And user capacity of the proposed system is much better than conventional system because spreading code can be reused in each block. And the proposed system can get frequency diversity gain so that performance becomes better. Performance is analyzed, and simulations are carried out to illustrate the merits of PB/MC-CDMA relative to existing alternatives given in this document.