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A proposal of sub-carrier selecting MC-CDMA system for 4G systems

Expectations are growing that the forthcoming 4th generation mobile communication systems will offer transmission data rates as high as 100Mbps or more. Because of the wide bandwidth transmission needed and the expected use of the high- frequency microwave band, the following issues are seen as barriers to the development of 4G systems; (1) high power consumption of mobile terminals, (2) small cell coverage area, and (3) high Doppler frequency. As a solution, we propose the Sub-Carrier Selecting MC-CDMA system. The proposed system is based on MC-CDMA, which is a combination of OFDM and CDMA. We add three features to MC-CDMA technology to resolve the above issues: (1) sub-carrier selection, (2) best-effort cell structure, and (3) MMSE combining. We detail the proposed system and demonstrate that it works well through computer simulations.