Elements of information theory
Elements of information theory
Convex Optimization
Power allocation for block-fading channels with arbitrary input constellations
IEEE Transactions on Wireless Communications
Outage probability of the free-space optical channel with doubly stochastic scintillation
IEEE Transactions on Communications
BER Performance of Free-Space Optical Transmission with Spatial Diversity
IEEE Transactions on Wireless Communications
The Gaussian free space optical MIMO channel with Q-ary pulse position modulation
IEEE Transactions on Wireless Communications - Part 1
Multiaccess fading channels. II. Delay-limited capacities
IEEE Transactions on Information Theory
Optimum power control over fading channels
IEEE Transactions on Information Theory
Evaluating the performance of convolutional codes over block fading channels
IEEE Transactions on Information Theory
Diversity and multiplexing: a fundamental tradeoff in multiple-antenna channels
IEEE Transactions on Information Theory
Mutual information and minimum mean-square error in Gaussian channels
IEEE Transactions on Information Theory
Coded modulation in the block-fading channel: coding theorems and code construction
IEEE Transactions on Information Theory
Optimum power allocation for parallel Gaussian channels with arbitrary input distributions
IEEE Transactions on Information Theory
Outage Capacity of MIMO Poisson Fading Channels
IEEE Transactions on Information Theory
Capacity of wireless optical communications
IEEE Journal on Selected Areas in Communications
Part 1: optical communication over the clear turbulent atmospheric channel using diversity
IEEE Journal on Selected Areas in Communications
Performance Bounds for Free-Space Optical MIMO Systems with APD Receivers in Atmospheric Turbulence
IEEE Journal on Selected Areas in Communications - Part 2
Outage exponents of block-fading channels with power allocation
IEEE Transactions on Information Theory
Queueing system with alternating service rates for free space optics-radio hybrid channel
MACOM'10 Proceedings of the Third international conference on Multiple access communications
Network-coded multiple-source cooperation aided relaying for free-space optical transmission
International Journal of Communication Systems
Automation and Remote Control
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We study the hybrid free-space optical (FSO) and radio-frequency (RF) channel from an information theoretic perspective. Since both links operate at vastly different carrier frequencies, we model the hybrid channel as a pair of parallel channels. Moreover, since the FSO channel signals at a higher rate than the RF channel, we incorporate this key feature in the parallel channel model. Both channels experience fading due to scintillation, which is slow compared to typical signalling rates. Under this framework, we study the fundamental limits of the hybrid channel. In particular, we analyse the outage probability in the large signal-to-noise ratio (SNR) regime, and obtain the outage diversity or SNR exponent of the hybrid system. First we consider the case when only the receiver has perfect channel state information (CSIR case), and obtain the exponents for general scintillation distributions. These exponents relate key system design parameters to the asymptotic outage performance and illustrate the benefits of using hybrid systems with respect to independent FSO or RF links. We next consider the case when perfect CSI is known at both the receiver and transmitter, and derive the optimal power allocation strategy that minimises the outage probability subject to peak and average power constraints. The optimal solution involves non-convex optimisation, which is intractable in practical systems. We therefore propose a suboptimal algorithm that achieves significant power savings (on the order of tens of dBs) over uniform power allocation. We show that the suboptimal algorithm has the same diversity as the optimal power allocation strategy.