Optimal Bit and Power Allocation Algorithm in Multi-Carrier CDMA

Multi-carrier code division multiple access (MC-CDMA) is a promising candidate for the air interface of 4G wireless networks. In MC-CDMA systems, a number of sub carriers per user are used for the high-rate data transmission, and each data modulated by a different sub earlier is transmitted through a different frequency band. Each data undergoes a different channel condition and arrives with a different error rate at the base station. By transmitting message data based on the channel state information (CSI), a new data transmission scheme called "optimal bit and power allocation algorithm in multi-carrier CDMA" is introduced in this paper. Simulated results have shown that the scheme yields a higher system capacity than a conventional MC-CDMA.