Diversity of Coded Beamforming in MIMO-OFDM AF Relaying Systems With Direct Link
- Authors
- Kong, Han-Bae; Song, Changick; Ahn, Minki; Lee, Inkyu
- Issue Date
- Aug-2015
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Channel coded systems; direct link; diversity; multiple-input multiple-output (MIMO) systems; relay
- Citation
- IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, v.64, no.8, pp.3817 - 3822
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
- Volume
- 64
- Number
- 8
- Start Page
- 3817
- End Page
- 3822
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/92853
- DOI
- 10.1109/TVT.2014.2359668
- ISSN
- 0018-9545
- Abstract
- This paper investigates the diversity order of beamforming schemes in frequency-selective multiple-input multiple-output (MIMO) amplify-and-forward (AF) relaying channels with a nonnegligible direct link between the source and the destination. In this system, orthogonal frequency-division multiplexing and bit-interleaved coded modulation schemes are adopted to exploit multipath diversity. Due to a nonconvex property of the problem, the optimal performance of flat-fading MIMO relaying channels, which is imperative to derive the diversity order, is still unknown. To this end, we first identify upper and lower bounds of the signal-to-noise ratio (SNR) of the flat-fading channels, which lead to upper and lower bounds of diversity order of coded beamforming in frequency-selective channels. Then, we establish the diversity order as a closed form by showing that these bounds are tight. In addition, our analysis provides an insightful guideline for code constructions to achieve a proper diversity gain of the system. The accuracy of our analysis is validated through simulation results.
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