Space-Frequency Parallel Transmitter Diversity Techniques for Three Pre-Coded OFDM Systems

作者：Yeh Hen Geul^*

来源：IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, 2018, 65(8): 1024-1028.

DOI：10.1109/TCSII.2017.2787105

• Space frequency
• inter-carrier interference
• parallel cancellation
• orthogonal frequency division multiplexing
• Walsh-Hadamard
• Haar
• Slant transforms

This brief presents three space-frequency (SF) pre-coded orthogonal frequency division multiplexing (OFDM) systems to combat inter-carrier interference in mobile fading channels without knowing the channel state information at the transmitter. First, a 2x1 SF architecture is developed to form a 2x1 SF-OFDM system. Second, the parallel cancellation scheme is integrated with this SF-OFDM system to form a new SFPC-OFDM system. Third, three orthogonal transforms, Walsh-Hadamard (WH), Haar, and Slant, are employed as the pre-coder to form WHSFPC-, HAANSFPC-, and SLANTSFPC-OFDM systems. All three pre-coded systems improve bit error rate without expanding power or bandwidth in comparing with the SFPC scheme. Simulations indicate that both WHSFPC- and SLANTSFPC-OFDM systems outperform both SFPC- and HAARSFPC-OFDM systems, while SFPC-OFDM systems outperform SF-OFDM systems. All three pre-coded SFPC schemes are simple and backward compatible with the existing OFDM system. They may serve as basehand building blocks in OFDM transceivers and can be expanded to multiple input and multiple output systems.

• 出版日期2018-8