Alamouti-type space-time coding for free-space optical communication with direct detection

Incremental adaptive networks implemented by free space optical (FSO) communication

The aim of this paper is to fully analyze the effects of free space optical (FSO) communication links on the estimation performance of the adaptive incremental networks. The FSO links in this paper are described with two turbulence models namely the Log-normal and Gamma-Gamma distributions. In order to investigate the impact of these models we produced the link coefficients using these distribu...

On Extended Alamouti Schemes for Space-Time Coding

The Alamouti space-time code for transmission diversity is extended recursively to 2n×2n antenna elements as well as to unsymmetrical arrays of the size m × n. The proposed schemes exhibit two significant advantages: they allow for higher diversity (of degree 2 for the symmetrical case) and at the same time can be implemented as zero-forcing or MMSE type at low complexity avoiding any matrix in...

Alamouti-Based Space-Frequency Coding for OFDM

We investigate space-frequency block coding for OFDM systems with multiple transmit antennas, where coding is applied in the frequency domain (OFDM carriers) rather than in the time domain (OFDM symbols). In particular we consider Alamouti’s code, which was shown to be the optimum block code for two transmit antennas and time domain coding. We show that the standard decoding algorithm results i...

Achievable information rate for outdoor free space optical communication with intensity modulation and direct detection

This work investigates the achievable information rate with the state-of-the-art turbo coding and intensity modulation / direct detection for outdoor long-distance free-space optic (FSO) communications. The channel under weak atmospheric turbulence is modeled as a log-normal intensity fading channel where on-off keying makes it look asymmetric. While no effort is made to spectrally match the co...

Free Space Optical Communication for Tactical Operations