In this paper, the performance of an ultra-fast all-optical symmetric Mach Zehnder (SMZ) interferometer employed as a demultiplexer and/or a switch in an OTDM network is investigated by means of controlling the power of the control pulses. Employing control signals with optimum unequal powers results in reduced residual crosstalk, thus leading to improved bit error rate (BER) performance and re...

This work addresses the problem of optimum decoding and detection of a multibit, multiplicative watermark hosted by Weibull-distributed features: a situation which is classically encountered for image watermarking in the magnitude-of-DFT domain. As such, this work can be seen as an extension of the system described in a previous paper, where the same problem is addressed for the case of 1-bit w...

A method for efficiently selecting the operating modes within a block-based multi-mode video compression system is described. For a given image region, the optimum combination of modes is selected so as to minimize the overall distortion for a given bit-rate budget. Necessary conditions for optimizing the encoder operation are derived within a rateconstrained product code framework [I]. When ra...

A significant increase in spectrum efficiency is required to cope with the exponentially increasing traffic loads. These challenges the design of multipleinput multiple-output (MIMO) systems associated with the BS (Base Station). A typical long-term evolution BS consists of radio-frequency (RF) chains, direct current to direct current converters, cooling fans, etc. An adaptive antenna selection...

A novel multiuser code division multiple access (CDMA) channel estimator based on genetic algorithm is considered which estimates the fading channel impulse response coefficients of all the users. Furthermore, the optimum multiuser detector, based on the maximum likelihood (ML) rule, is developed in order to identify the transmitted data sequence. As is demonstrated in simulation results, the p...

This paper presents an optimum amplifying relay matrix based on minimum mean square error (MMSE) criteria for the cooperative distributed wireless relay networks under channel uncertainty and total power constraint at the relay nodes. A one-source-one-destination pair node and N relay nodes are considered, which can be extended for a general case. All relays are assumed to exchange their receiv...

A novel approach to image compression using vector quantization of linear (one-step) prediction errors is presented in this paper. In order to minin,ize the image reconstruction error, we choose the optimum predictor coefficients (in a least-squares sense) that satisfy the additional constraint that the energy of the impulse response function of the inverse reconstruction filter is bounded by a...

We study joint source-channel coding for a power constrained Gaussian channel and its application to progressive image compression. For a given power constrained, we consider the optimum allocation of energy per bit for a BPSK transmitter and the best choice of channel code rate, when the performance is measured by end-to-end average quantizer distortion. Choosing the average energy per transmi...

Correctly choosing rock-breaking bit is critical in oil drilling. The optimal model of selecting a bit has been established based on the Factor Analysis Theory. Through selecting primitive variables, and using SPSS (Statistical Package for the Social Sciences) to get factor loading matrix, factor rotation and factor score, we have reasonably evaluated and optimized the selection of rock-breakin...

In this paper a new policy for improving the performance of the slotted persistent CSMA/CD protocol is proposed. The policy is based on using the channel feedback information to adaptively adjust the level of traffic intensity in order to achieve an optimum system performance. The algorithm for choosing the required step size of the variability for the adjustment of the loading percent of each ...