Research On Milti-user Detection Technology In MIMO-OFDM System

MIMO-OFDM system which is combined by MIMO technology and OFDM technology is a great breakthrough of aptitude antenna technology in wireless telecommunication. MIMO technology can increase times of the capacity of communicate system and spectrum efficiency without any additional bandwidth. OFDM technology is considered as one of the key technique of the new generation of wireless communication system, because of its character of risisting the time delay spread in high-speed data transfer system.MUD technology and high performance coding technology are the key techniques for future mobile communication system with large capacity and high quality,the interface between them influnces the performance of the receiver directly.MUD is a new method of risisting MAI at the receriver.It can not only eliminate MAI,but also can resist near-far problem and interference of multiple path so as to improve the performance of the system. Turbo codes with its outstanding performance of being close upon the Shannnon limit is a great breakthrough of the area of information theory and coding theory.The interative detection method derived from Turbo has been already successfully used in coding ,signal processing and other fields.The interative MUD technique based on Turbo decoding theory is a new united MUD with high performance.STC technique based on MIMO system is a kind of coding technique.It can fully improve the quality and the capacity of communication system by relizing wireless transmitting with high spectrum effeciency.It also has excellent capability of resisting multipath fading. STC combined with channel coding technique can apply more capacity than the traditional communication system in the wireless fading channel.In the wireless communication system,multi-users cannot avoid share the resource,so it is very worth to do research on muti-user STC technique.The parctice system is not a flat fading...