Multiple Access Technologies for Next Generation Mobile Communications

The next generation mobile communication systems will need to support multiple services ubiquitously in different types of environments, different levels of data rates, and different mobility and traffic management techniques. In this talk, major multiple access technologies in the first, second and third-generation wireless cellular systems are reviewed, and possible directions for the development of appropriate multiple access technologies for next-generation mobile networks, the so-called 4G or beyond 3G (B3G), are investigated. This talk discusses mainly a number of promising multiple access technologies for 4G mobile cellular systems, including TF-CDMA (time-frequency CDMA, a combination of DS-CDMA and MC-CDMA), OFDMA (orthogonal frequency division multiple access), TDD-CDMA (a modified version of TD-CDMA), PDMA (packet division multiple access), IDMA (interleave division multiple access), GIDMA (grouped IDMA), etc