Multiple access techniques for future generation mobile networks

Systems with single-carrier techniques show significant limits when high data speed transmission is concerned. In order to increase data speed, meet QoS requirements and maximize system capacity, multiple access techniques with efficient resource allocation are investigated. Systems with multi-carriers and multiple spreading in time, frequency, code or space domain, as well as radio link adaptation technologies, are favoured due to huge capacity, robustness and flexibility. Therefore, future research and design of mobile networks shall focus on multi-carrier hybrid modulation systems with adaptive technology and multiple smart antennas. This paper describes multiple access techniques suitable for mobile communication systems, stresses the importance of resource allocation techniques, briefly touches on present mobile network technology and finally gives an overview of multiple-access techniques for future mobile networks