Impact of cooperative space–time/frequency diversity in OFDM-based wireless sensor systems over mobile multipath channels

Jiayi Zhang; Hamid Gharavi; Bin Hu

Impact of cooperative space–time/frequency diversity in OFDM-based wireless sensor systems over mobile multipath channels

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Author(s): Jiayi Zhang ¹ ; Hamid Gharavi ¹ ; Bin Hu ¹
- Affiliations: 1: Information Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899-8920, USA
Source: Volume 6, Issue 4, August 2016, p. 138 – 143
DOI: 10.1049/iet-wss.2015.0033 , Print ISSN 2043-6386, Online ISSN 2043-6394

Received 12/03/2015, Accepted 21/10/2015, Revised 30/09/2015, Published 01/08/2016

Cooperative linear dispersion coding (LDC) can support arbitrary configurations of source nodes and destination nodes in virtual multi-input–multi-output systems. In this study, the authors investigate two spatial diversity applications of cooperative LDC for orthogonal frequency division multiplexing (OFDM)-based wireless sensor systems in order to achieve space–time/frequency (ST/SF) diversity gains when transmitting over time-/frequency-selective fading channels. Cooperative LDC-aided ST-/SF-OFDM is flexible in configuring various numbers of cooperative source nodes and time-slots or frequency-tones. Their results show that the ST-OFDM scheme is sensitive to exploiting diversity gains, subject to the impact of varying channel Doppler spreads; while the performance of SF-OFDM is mainly subject to delay spread. Specifically, when the system involves more than two cooperative nodes, the cooperative LDC-aided ST-/SF-OFDM outperforms the cooperative orthogonal block codes (e.g. Tarokh's codes) aided ST-/SF-OFDM, when communicating over a higher Doppler/delay spread.

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Impact of cooperative space–time/frequency diversity in OFDM-based wireless sensor systems over mobile multipath channels

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