Two-Stage Code Acquisition in Wireless Optical CDMA Communications Using Optical Orthogonal Codes

Optical CDMA with Optical Orthogonal Code

This report examines optical CDMA communication techniques with optical orthogonal codes. Simulations that show the desired properties of theses codes and their use in optical CDMA are reported. Based on the simulations, we investigate the properties of optical CDMA. Proba bility of error is also evaluated.

Space-Time Codes for Wireless Optical Communications

A space-time channel coding technique is presented for overcoming turbulence-induced fading in an atmospheric optical heterodyne communication system that uses multiple transmit and receive apertures. In particular, a design criterion for minimizing the pairwise probability of codeword error in a space-time code (STC) is developed from a central limit theorem approximation. This design criterio...

Semi-Blind Two-Dimensional Code Acquisition in CDMA Communications

In this paper, we propose a new algorithm for joint time-delay and direction-of-arrival (DOA) estimation, here called two-dimensional code acquisition, in an asynchronous directsequence code-division multiple-access (DS-CDMA) array system. This algorithm depends on eigenvector-eigenvalue decomposition of sample correlation matrix, and requires to know desired user’s training sequence. The perfo...

Design of Two Dimensional Unipolar (Optical) Orthogonal Codes Through One Dimensional Unipolar (Optical) Orthogonal Codes

— In this paper, an algorithm for construction of multiple sets of two dimensional (2D) or matrix unipolar (optical) orthogonal codes has been proposed. Representations of these 2D codes in difference of positions representation (DoPR) have also been discussed along-with conventional weighted positions representation (WPR) of the code. This paper also proposes less complex methods for calculati...

A New Modulation Scheme Using Asymmetric Error Correcting Code Embedded in Optical Orthogonal Code for Optical CDMA