A Training-Based Iterative Detection/Channel Estimation Scheme for Large Non-Orthogonal STBC MIMO Systems

QC 20111021
In this paper, we propose a training-based channel estimation scheme for large non-orthogonal space-time block coded (STBC) MIMO systems. The proposed scheme employs a block transmission strategy where an Nt times Nt pilot matrix is sent (for training purposes) followed by several Nt times Nt square data STBC matrices, where Nt is the number of transmit antennas. At the receiver, we iterate between channel estimation (using an MMSE estimator) and detection (using a low-complexity likelihood ascent search (LAS) detector) till convergence or for a fixed number of iterations. Our simulation results show that excellent bit error rate and nearness-to-capacity performance are achieved by the proposed scheme at low complexities. The fact that we could show such good results for large STBCs (e.g., 16times16 STBC from cyclic division algebras) operating at spectral efficiencies in excess of 20 bps/Hz (even after accounting for the overheads meant for pilot-based channel estimation and turbo coding) establishes the effectiveness of the proposed scheme.

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Telekommunikation hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Telecommunications hsv//eng
bit error rate;convergence;iterative methods;nearness-to-capacity performance;nonorthogonal STBC MIMO systems;nonorthogonal space-time block coded systems;spectral efficiency;training-based channel estimation scheme;training-based iterative detection scheme;transmit antennas;MIMO communication;block codes;channel coding;channel estimation;convergence;error statistics;iterative decoding;space-time codes;wireless channels;

By the author/editor: Zaki, Ahmed; Mohammed, Saif K ...; Chockalingam, An ...; Rajan, B. S.

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Electrical Engin ...; and Telecommunicatio ...

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