Generalized Algorithms for Subspace-based Blind Channel Estimation in Space-time Coded ZP Systems
Date Issued
2011
Date
2011
Author(s)
Yo, Shang-Yi
Abstract
Blind channel estimation in space time block code (STBC) block transmission systems equipped with zero padding (ZP) is considered in this thesis. Different from pilot-based channel estimation, blind channel estimation does not require extra bandwidth to identify channel coefficients. In this thesis, we proposed a subspace-based blind channel estimation algorithm with generalized precoders in STBC-ZP systems. Our approach is based on repeated use of received signals and has a system parameter called repetition index. If we select repetition index carefully, the number of received blocks required can be significantly reduced. Another technique, namely the conjugate method, is also proposed to further enhance the channel estimation performance. In addition, we summarize the conditions on channel coefficients, source symbols, and precoders for the proposed blind algorithms to perform channel estimation properly. Finally, simulation results show that the proposed algorithms outperform previously reported methods when the number of received blocks and repetition index are properly chosen.
Subjects
Blind Channel Estimation
Subspace method
Space-time block code
Type
thesis
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