Open AccessDiversity-optimal power loading for intensity modulated MIMO optical wireless communications
Author(s) -
Yanyu Zhang,
Hongyi Yu,
Jiankang Zhang,
Yi-Jun Zhu
Publication year - 2016
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.007905
Subject(s) - antenna diversity , mimo , computer science , transmitter , channel (broadcasting) , channel state information , diversity combining , diversity scheme , code (set theory) , free space optical communication , repetition code , signal to noise ratio (imaging) , diversity gain , optical wireless , electronic engineering , wireless , telecommunications , algorithm , optical communication , optics , physics , fading , decoding methods , engineering , block code , concatenated error correction code , set (abstract data type) , programming language
In this paper, we consider the design of space code for an intensity modulated direct detection multi-input-multi-output optical wireless communication (IM/DD MIMO-OWC) system, in which channel coefficients are independent and non-identically log-normal distributed, with variances and means known at the transmitter and channel state information available at the receiver. Utilizing the existing space code design criterion for IM/DD MIMO-OWC with a maximum likelihood (ML) detector, we design a diversity-optimal space code (DOSC) that maximizes both large-scale diversity and small-scale diversity gains and prove that the spatial repetition code (RC) with a diversity-optimized power allocation is diversity-optimal among all the high dimensional nonnegative space code schemes under a commonly used optical power constraint. In addition, we show that one of significant advantages of the DOSC is to allow low-complexity ML detection. Simulation results indicate that in high signal-to-noise ratio (SNR) regimes, our proposed DOSC significantly outperforms RC, which is the best space code currently available for such system.