Spectrally efficient time-frequency training OFDM for MIMO systems

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Authors Linglong Dai, Zhaocheng Wang
Journal/Conference Name IEEE Wireless Communications and Networking…
Paper Category
Paper Abstract The large number of pilots commonly used in OFDM MIMO systems reduces the spectral efficiency in practice. This paper proposes the time-frequency training OFDM (TFT-OFDM) transmission scheme for MIMO systems to solve this problem. The transmission frame is composed of one preamble and the following TFT-OFDM symbols, where each TFT-OFDM symbol without cyclic prefix adopts the time-domain training sequence (TS) and the frequency-domain orthogonal grouped pilots as the time-frequency training information. At the receiver, the time-frequency joint channel estimation directly exploits the “contaminated” time-domain TS to estimate the path delays only, while the path gains are acquired by the frequency-domain grouped pilots. The Cramer-Rao lower bound (CRLB) of the proposed estimator is also derived. Compared with standard OFDM MIMO systems in typical applications, the proposed scheme has about 17% higher spectral efficiency, and has better performance over doubly selective fading channels as indicated by the simulation results.
Date of publication 2013
Code Programming Language MATLAB

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