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A detailed simulative and experimental analysis of different CPE schemes for 64-QAM systems is presented. The best compromise between linewidth tolerance and complexity is achieved using a recently proposed multi-stage architecture, based on a modification of the standard V&V algorithm.
Regenerative peripheral nerve interfaces have been proposed as viable alternatives for the natural control and feel of robotic prosthetic limbs. We have developed a Regenerative Multi-electrode Interface (REMI) that guides re-growing axons through an electrode array deployed in the lumen of a nerve guide. While acute studies have shown the use of the REMI in the rat sciatic nerve, the quality of chronic...
This main proposed an appropriate automatic optimization system as a criterion of Contrast-detail phantom (CD-phantom) image quality. First, the test region is separated from the phantom image of Plexiglas tablet, and four corners region are located linearly. Then the geometry distorted bilinear equation model and the bilinear pixel interpolation are used to recover the image of rectangular test region...
Error performance of a coherent free space optical system with K-distributed turbulence is studied. A closed-form expression of the moment generating function for K-distributed turbulence is derived, and the moment generating function is used to obtain the exact error rates for binary phase shift keying (BPSK), BPSK with spatial diversity, as well as differential phase-shift keying. Based on our analytical...
Asymptotic error rate expressions are derived for multi-branch equal gain combining and selection combining operating on arbitrarily correlated Rayleigh fading channels. These closed-form solutions are used to provide rapid and accurate estimation of the error rates in large signal-to-noise ratio regions. More importantly, it is shown that the asymptotic error rates over correlated branches can be...
Closed-form asymptotic expressions are developed to assess the error rate performances of equal gain combining and selection combining operating over N-branch arbitrarily correlated Rician fading channels at large values of signal-to-noise ratio. The compact solutions reveal explanations for counter-intuitive phenomena on correlated Rician fading channels reported by other researchers.
Coherent modulation is more appropriate than differential modulation for orthogonal frequency division multiplexing (OFDM) systems requiring high data rate and spectral efficiency. Channel estimation is therefore required as an integral part of the receiver design. An iterative maximum likelihood-based channel estimation algorithm for an OFDM system in dispersive time-varying channels is proposed...
Maximum-likelihood based channel estimation is considered for orthogonal frequency division multiplexing systems in dispersive time-varying channels. A successive overrelaxation approach is adopted to analyze the convergence rate of an iterative channel estimation algorithm. Based on the analysis, an improved fast converging iterative channel estimation algorithm is proposed. Numerical tests are performed...
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