1 The purpose of this paper is to study how the different propagation environments as well as antenna configurations impact on the performances of space-time block coded (STBC) MIMO systems. Based on the geometrical differences such as one-ring model and elliptical model with different distributions of scatters, the comparisons on system performances are presented here. The impacts of the mean ...

Coherent modulation formats have gained considerable importance in high-capacity, high-efficiency optical systems. A key component for achieving good transmission performances are Lithium niobate modulators, which can be designed and optimized to operate with BPSK, QPSK, 16-QAM and OFDM modulation schemes providing excellent results. Keywords-LiNbO3; coherent systems; modulators.

Detailed study of external quantum efficiency hQE is reported for AlGaInP-based microcavity light-emitting diodes ~MCLEDs!. Unlike conventional light-emitting diodes ~LEDs! the extraction efficiency gext and far field profile depend on the linewidth of the intrinsic spontaneous emission and wavelength detuning between cavity mode and peak electroluminescence. This dependence makes it difficult ...

The two-step spectral clustering method, which consists of the Laplacian eigenmap and a rounding step, is widely used method for graph partitioning. It can be seen as natural relaxation to NP-hard minimum ratio cut problem. In this paper, we study following central question: When able find global solution problem? First, provide condition that naturally depends on intra- intercluster connectivi...

The Algebraic Space Time Codes (ASTC) are constructed based on cyclic algebras; they showed a good spectral efficiency, a full diversity, and a full rate under non selective channel condition. However, the radio mobile channel is a selective channel whose features vary during the time. This selectivity is owed to the multi-path phenomenon and generates interferences between symbols (IES). The o...

The main information sources to study a particular piece of music are symbolic scores and audio recordings. These are complementary representations of the piece and it is very useful to have a proper linking between the two of the musically meaningful events. For the case of makam music of Turkey, linking the available scores with the corresponding audio recordings requires taking the specifici...

The quantitative forecasting of spectral imaging system performance is an important capability at every stage of system development including system requirement definition, system design, and even sensor operation. However, due to the complexity of the end-to-end remote sensing system involved, the analyses are often performed piecemeal by various groups, and then merged together. The ability t...

The frequency estimate for a real sinusoid provided by the periodogram has a bias which is particularly severe for a short observation interval. In this paper, two improvements to the periodogram are proposed to reduce this bias. The rst method transforms the real tone to an analytic signal while the second algorithm subtracts the negative spectral line from the received signal, prior to applyi...

The percentage removal of phenol from aqueous solution by emulsion liquid membrane and emulsion leakage was investigated experimentally for various parameters such as membrane: internal phase ratio, membrane: external phase ratio, emulsification speed, emulsification time, carrier concentration, surfactant concentration and internal agent concentration. These parameters strongly influence the p...