Design of Robust Receiver for Space-Time Block Coded Multi-user MIMO System under Channel Estimation Errors

• Main Authors: lin chien-yu, 林倩羽
• Other Authors: Ta-Sung Lee
• Format: Others
• Language: en_US
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/05547305823968857905

碩士 === 國立交通大學 === 電信工程系所 === 96 === It is well known that space-time block coding (STBC) has emerged as a popular technique in multiple-input multiple-output (MIMO) wireless communication, especially for multi-user cases. Several linear receiver algorithms have been developed for such a system where multi-access inference (MAI) causes a problem. A common shortcoming of all these techniques, however, is that they are all developed based on the perfect channel assumption. Channel estimation errors do happen in practical situations due to the limited training symbols or severe fading channels. In this thesis, new robust linear receivers for joint space-time decoding and interference rejection in orthogonal space-time block coded multi-user MIMO systems are proposed for combating imperfect channel estimation. The proposed receivers are developed based on the constrained optimization design which can be transformed to an equivalent unconstrained one by the generalized sidelobe canceller (GSC) technique. By using the perturbation techniques, the channel estimation error term can be incorporated into the receiver design. We also apply the successive interference cancellation (SIC) mechanism for further performance enhancement. Numerical simulations confirm the robustness of the proposed receiver when compared with the other existing techniques.