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Research on Multi-user Detection Technology in MIMO-OFDM System

Author: HeMeiZhi
Tutor: LiYanPing
School: Taiyuan University of Technology
Course: Circuits and Systems
Keywords: Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing Parallel interference cancellation Linear MMSE estimation algorithm
CLC: TN919.3
Type: Master's thesis
Year: 2010
Downloads: 138
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Abstract


Future wireless communication to achieve high-speed data transmission , multimedia services while facing two major challenges : the multipath fading and spectrum utilization . Orthogonal frequency division multiplexing (OFDM) techniques through the channel is decomposed into a plurality of orthogonal subchannels The method of frequency selective multipath fading channels to flat fading channel transformation, to effectively reduce the impact of multipath fading . And multiple input multiple output (MIMO) technology in space to produce a plurality of independent parallel channel to simultaneously transmit data, in the case without increasing the system bandwidth to improve the spectrum utilization . MIMO technology and OFDM technology are combined to form a MIMO-OFDM system is a major breakthrough, to be able to significantly improve the channel capacity and the transmission rate of the wireless communication system , and which can effectively resist multi-path fading , interference suppression of smart antenna technology in the field of wireless communication and noise , is considered to be the key technology for next-generation wireless communication system . Multi-user detection (Multi-User Detection, MUD) technology is a new class of anti- multiple access interference (MAI) technology , is to start from the receiving end interference suppression method can not only effectively eliminate MAI , but also can resist the near-far effect and more than path interference and improve system performance . This paper studies the work are as follows : details the basic principles of MIMO and OFDM technologies , MIMO-OFDM system model and the characteristics of the system , and MIMO capacity simulation analysis . Discussion . Around multi-user detection technology , introduces the basic idea , the system model , performance indicators , classification of algorithms and different algorithms were simulated and compared ; signal detection technique for MIMO-OFDM systems analysis detection algorithm of maximum likelihood (ML), zero forcing detection algorithm ( ZF ) , minimum mean square error detection algorithm (MMSE) and MMSE based parallel interference cancellation detection algorithm ( MMSE- PIC ) , and ZF, MMSE and ML algorithm performance simulation . 4. Proposed an iterative receiver in MIMO-OFDM system structure , multi-user detection and channel estimation iterative detection soft information provided by the decoder to improve system performance , multi-user detection by parallel interference cancellation (PIC) algorithm and MMSE filter channel estimation using linear MMSE estimation algorithm , the simulation results show that the performance improvement through iterative system .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Data communication > Data transmission technology
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