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Research on Space-Time Block Code Blind Detection

Author: WangDanHua
Tutor: ZhangChaoZhu
School: Harbin Engineering University
Course: Communication and Information System
Keywords: Space - time block codes Blind detection EASI FAST-ICA
CLC: TN911.23
Type: Master's thesis
Year: 2009
Downloads: 70
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Abstract


STBC is a way to get the maximum transmit diversity gain , having encoded low decoding complexity . The signal detection of the space-time coding scheme ( s ) typically require the receiver to accurately know the CSI ( channel state information ) of the channel , which typically requires using the channel estimation . Method based on the channel estimation , need to send a longer pilot sequences, will cause the loss of spectral efficiency . Blind detection without sending a training sequence signal detection can be achieved is a research hotspot in recent years . Blind detection system for space-time block coding made ??the following : 1 . Based on independent component analysis (ICA) for space - time block codes the blind detection technology in low SNR prone to convergence , the bit error rate high , two low signal-to-noise ratio case blind detection methods : based on the fixed step denoising blind detection methods and blind detection method based on variable step size denoising . These two methods in space-time coding introduction of adaptive noise cancellation . By design suitable for blind detection of low signal-to-noise ratio , the space-time block codes adaptive noise cancellation , to solve the low SNR ( signal-to-noise ratio) convergence of blind detection , blind detection success rate . Existing space-time block code blind source detection algorithm more applicable to the real signal , the the generally complex signal processing communications confrontation . To solve this problem , this paper studies the plural blind detection methods suitable for space-time block codes . In the proposed algorithm , the full use of orthogonal space - time block codes . Our model of STBC orthogonal transform defines a complex signal based on the orthogonal separation model , and the model is applied to the space-time block code blind detection method of an improved complex EASI algorithm . In addition , blind detection methods for space - time block codes receiving end of the signal structure presents a the orthogonal complex blind detection algorithm . 3 . Detailed study of a complex algorithm and derivation of the FAST-ICA . Two in the FAST-ICA the plural algorithm based on independent component analysis algorithm based on improved Newton iteration method . FAST-ICA and will improve the complex algorithm used in space-time block codes blind detection process . Two FAST-ICA complex algorithm improved in the case of considerable separation , to reduce the number of iterations , improving the convergence rate , and enhance the performance of the space-time block code blind detection methods .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication theory > Information Theory > Signal detection and estimation
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