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Belief-Propagation Based MIMO Detection Algorithm and Its Application

Author: WuMengZhe
Tutor: ChenQingChun
School: Southwest Jiaotong University
Course: Communication and Information System
Keywords: Multiple-input multiple-output ( MIMO ) Space-time codes BP algorithm Universal
CLC: TN919.3
Type: Master's thesis
Year: 2011
Downloads: 46
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Abstract


The contradiction between the rapid development of the wireless communications business of the limited spectrum resources and increasing communication capacity is becoming more prominent. In view of this situation, how to maximize the spectrum utilization, is a hot topic of current research. MIMO technology breakthrough the SISO system capacity limit doubled without increasing the bandwidth and transmit power in fading channels, MIMO technology can improve the channel capacity of the communication system. The thesis research MIMO detection algorithm based on belief propagation BP, the main objective of the thesis is a comprehensive assessment of the MIMO detection technology based on BP algorithm and its performance can get different MIMO system under the conditions of. Basic principles of the BP algorithm MIMO detection technology is based on the correlation of time and space introduced by the use of space-time coding technology, the BP detector at the receiving end, the belief propagation the ideological by time and space constraints departure to complete the detection of the transmitted symbol. Space-time code detection principle based on the paper introduced the BP algorithm based on belief propagation, hierarchical code orthogonal space-time block code and space-time, to explore the detection technique based on BP algorithm analysis based on BP algorithm empty code detection technology implementation complexity, and discuss the impact of space-time the BP detection of performance factors, and verified by simulation based on the the BP algorithm detection performance in space-time, to verify the feasibility of BP algorithm in the MIMO detection technology applications. Complete space-time block code with full rate constellation set QAM or HEX good constellation constraints set out, determinant tends to zero, the same average transmit power on each antenna characteristics. The paper combines a complete space-time block codes coding structure analysis applies to a complete empty block codes BP detection algorithm, thesis research results show that the complete empty packet the code equivalent VBLAST detection model based on BP detection algorithm provides achieve high performance complete empty space-time block codes detection technology program. Taking into account the actual wireless communication systems commonly used in high-performance channel coding technology thesis focuses on the LDPC coding under the conditions of the MIMO system, the paper discusses the iterative detection and decoding technology solutions based on BP algorithm, the simulation results show that, based on BP algorithm Iterative Detection and iterative decoding can significantly improve the coding MIMO system performance under the conditions. The thesis results indicate that for MIMO systems can more accurately estimate the channel state the MIMO detection technology based on BP algorithm can get better detection performance, BP algorithm applies to a different space-time coding scheme, a class with good universal space-time coding detection technology program.

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