Sai srinivas BTECH III/IV,ECE
Fourth generation (4G) communication systems require bandwidth efficiency and low complexity receivers to accommodate high data rates and large number of users per cell. This paper provides an introduction to a novel approach for uplink scenario in 4G mobile communication called multi-carrier interleave-division multiple-access (MC-IDMA). In this paper basic principles of interleave division multiple access (IDMA), orthogonal frequency division multiple access (OFDMA), and MC-IDMA are outlined. Comparisons are carried out between IDMA, MC-IDMA and multi-carrier code division multiple-access (MC-CDMA). The advantages of MC-IDMA over its competitive techniques are demonstrated. It is shown that MC-IDMA can be leading candidate for 4G mobile systems with its attractive advantages such as flexible rate adaptation, frequency diversity and multi user gain. Objectives
4G is being developed to accommodate the QoS and rate requirements set by further development of existing 3G applications like wireless broadband access, Multimedia Messaging Service (MMS), video chat, mobile TV, but also new services like HDTV content, minimal services like voice and data, and other services that utilize bandwidth. It may be allowed roaming with wireless local area networks, and be combined with digital video broadcasting systems. The 4G working group[clarification needed] has defined the following as objectives of the 4G wireless communication standard: Flexible channel bandwidth, between 5 and 20 MHz, optionally up to 40 MHz. A nominal data rate of 100 Mbit/s while the client physically moves at high speeds relative to the station, and 1 Gbit/s while client and station are in relatively fixed positions as defined by the ITU-R, A data rate of at least 100 Mbit/s between any two points in the world...