Relaying has been extensively studied during the last decades and has found numerous applications in wireless communications. The simplest relaying method, namely amplify and forward, has shown potential in MIMO multiple access systems, when Gaussian fading channels are assumed for both hops. However, in some cases ill conditioned channels may appear on the second hop. For example, this impairm...

Collaborative sensing is an important technology in cognitive radio(CR). According to the influence of signal-to-noise ratio(SNR) of sensing signal to the result of the detection, this paper discusses a new collaborative algorithm for the spectrum sensing based on SNR. It groups the cognitive users according to the SNR of the signal, and processes the test results of each group using “OR” guide...

In this technical report, we provide an analysis on the image formulation of structured light based techniques in the presence of strong ambient illumination. In Section 1, we derive an analytical expression for the signal-noise-ratio (SNR) of structured light coding schemes. We show that the SNR is proportional to the power ratio between structured light signal and ambient illumination. In Sec...

In an uncoupled parallel array of bistable dynamical elements subject to a common noisy subthreshold rectangular signal, the signal-to-noise ratio (SNR) gain can be improved by tuning the internally added array noise. A SNR gain above unity is observed in certain regions of the array noise intensity. The maximum SNR gain is obtained as the size of the array goes to infinity. This form of stocha...

Usually the capacity of multiple-input multiple-output (MIMO) wireless communication channels is evaluated under the assumption of fixed signal to noise (SNR) scenario. In this paper the impact of temporal SNR variation on capacity of MIMO wireless channels in urban microcells is considered. Results based on data measured in line of sight (LOS) and non line of sight (NLOS) propagation scenarios...

Image fusion using discrete complex wavelets is used to improve signal to noise ratio and good quality and shift invariant. This technique can be used for fusion of complementary information images as well as multi model image fusion. The proposed algorithm is very simple, easy to implement and could be used for real time applications. A Novel regionbased method increase flexibility. A dual tre...

In recent years, several inverse solutions of magnetoencephalography (MEG) have been proposed. Among them, the multiple signal classification (MUSIC) method utilizes spatiotemporal information obtained from magnetic fields. The conventional MUSIC method is, however, sensitive to Gaussian noise and a sufficiently large signal-to-noise ratio (SNR) is required to estimate the number of sources and...

objective(s): in spect, the sinogram contains scatter and lack of attenuated counts that degrade the reconstructed image quality and quantity. many techniques for attenuation and scatter correction have been proposed. an acceptable method of correction is to incorporate effects into an iterative statistical reconstruction. here, we propose new maximum likelihood expectation maximization (mlem) ...

The paper presents a technique to transmit 16QAM signals in mobile radio environments. The conventional method for compensating the multipath fading e ect using pilot symbol assisted modulation (PSAM) is extended, employing not only the pilot symbols but also the previously estimated fading values for evaluating the fading in the current frame. The main results of this paper are the symbol erro...