Performance evaluation of pre- and post-FFT beamforming methods in pilot-assisted SIMO-OFDM systems

Saeid R. Seydnejad () and Sadegh Akhzari
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Saeid R. Seydnejad: Shahid Bahonar University of Kerman
Sadegh Akhzari: Shahid Bahonar University of Kerman

Telecommunication Systems: Modelling, Analysis, Design and Management, 2016, vol. 61, issue 3, No 6, 487 pages

Abstract: Abstract Spatial domain processing using adaptive antenna arrays has been widely used to suppress co-channel interferences and mitigate the channel effect in single-input multiple-output (SIMO) OFDM systems. Two main mechanisms are pre-FFT scheme based on time-domain beamforming and post-FFT scheme based on frequency-domain beamforming. Both schemes have been recently extended to multiple-input multiple-output (MIMO) OFDM systems. However, there is no study, neither in SIMO-OFDM systems nor in MIMO-OFDM systems, to compare these two methods in details and provide specific guidelines to the designers on which scheme to deploy. Since performance improvement due to beamforming in both SIMO- and MIMO-OFDM systems are based on the same principles and noting the complexity of analysis in MIMO-OFDM beamforming systems, in this article we compare these two schemes in the simpler structure of a pilot assisted SIMO-OFDM system. This comparison is performed both from analytical perspective and by simulation results. It is shown under what conditions the more complex post-FFT scheme can exhibit better results and under what conditions the less costly pre-FFT scheme can demonstrate better performance. This greatly helps the designers to choose the right scheme based on their system characteristics.

Keywords: OFDM systems; Adaptive anttena array; Beamforming; Interference cancellation; Spatial diversity; SIMO-OFDM (search for similar items in EconPapers)
Date: 2016
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DOI: 10.1007/s11235-015-0007-8

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