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Chin. Opt. Lett.
 Home  List of Issues    Issue 09 , Vol. 12 , 2014    10.3788/COL201412.090602


Sample indexed spatial orthogonal frequency division multiplexing
Pankil Butala, Hany Elgala, Thomas D. C. Little
Department of Electrical and Computer Engineering, [Boston University], Boston, MA 02215, USA

Chin. Opt. Lett., 2014, 12(09): pp.090602

DOI:10.3788/COL201412.090602
Topic:Fiber optics and optical communications
Keywords(OCIS Code): 060.4080  060.4230  060.4510  060.2605  

Abstract
Optical spatial modulation (OSM) is a multiple-transmitter technique that can provide higher data rates with low system complexity as compared with single-input single-output systems. Orthogonal frequency division multiplexing (OFDM) is widely implemented to achieve better spectral efficiency in wireless channels. Asymmetrically clipped optical OFDM (O-OFDM) and DC-biased O-OFDM are two well-known O-OFDM techniques suitable for intensity-modulation direct-detection optical systems. In this work, sample indexed spatial OFDM (SIS-OFDM) is proposed to combine OSM and O-OFDM in a novel way and achieve significant performance gain. By assigning time-domain samples of the O-OFDM transmit symbol to different transmitters, SIS-OFDM achieves much better spectral efficiency and reduces computational complexity at the transmitter as compared with previous work that combines OSM with O-OFDM in the frequency domain. We also consider the impact of optical source biasing on overall performance, and the relative performance of imaging receiver (ImR) versus non-imaging receiver (NImR) design for our proposed SIS-OFDM technique. Results indicate that for an Ntx × Nrx multiple-input multiple-output configuration where Ntx = Nrx = 4, SIS-OFDM using ImR can achieve up to 135 dB of signal-to-noise ratio gain over comparable system using a NImR. Also, using Nsc number of O-OFDM subcarriers provides up to Nsc × log2(Ntx) additional bits per symbol of spectral efficiency over techniques that combine OSM and O-OFDM in the frequency domain.

Copyright: © 2003-2012 . This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Received:2014-3-4
Accepted:2014-6-3
Posted online:2014-8-8


Note: This work was supported by the Engineering Research Centers Program of the National Science Foundation under Grant No. EEC-0812056.

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