In this paper, the energy efficiency (EE) of downlink distributed antenna system (DAS) with multiple receive antennas is investigated over composite fading channel that takes the path loss, shadow fading and Nakagami-m fading into account. Our aim is to maximize EE which is defined as the ratio of the transmission rate to the total consumed power under the constraints of maximum transmit power ...

This paper proposes a composite channel virtual time reversal mirror (CCVTRM) for vertical sensor array (VSA) processing and applies it to long-range underwater acoustic (UWA) communication in shallow water. Because of weak signal-to-noise ratio (SNR), it is unable to accurately estimate the channel impulse response of each sensor of the VSA, thus the traditional passive time reversal mirror (P...

The problem addressed in this paper is the estimation of the channel parameters in a Code Division Multiple Access (CDMA) communication system, in the presence of multipath effects and multiple sensors at the base station receiver. The algorithm presented in this paper solves the problem by estimating a composite channel impulse response of each user, which can be directly used in the detection...

MHD flow and heat transfer have been analyzed for a front poloidal channel in the outboard module of a Dual Coolant Lithium Lead (DCLL) blanket, with a flow channel insert made of a silicon carbide composite. The US reference DCLL blanket module [C. Wong, S. Malang, M. Sawan, S. Smolentsev, S. Majumdar, B. Merrill, D.K. Sze, N. Morley, S. Sharafat, P. Fogarty, M. Dagher, P. Peterson, H. Zhao, S...

In this paper, we propose a subcarrier allocation method and a composite linear minimum mean square error (LMMSE) channel estimator to increase spectrum efficiency in orthogonal frequency division multiplexing (OFDM) transmit diversity. The pilot symbols for OFDM transmit (Alamouti) diversity are exclusively allocated in two OFDM symbols in different antennas, which causes serious degradation o...

A new space-time turbo equalization algorithm is derived for frequency-selective multiple-input–multiple-output (MIMO) channels with unknown interference. The algorithm is an extension of our proposed MIMO equalization algorithm [12], which performs joint channel estimation, multiple user’s signal detection, and decoding, all in an iterative manner. This paper’s proposed algorithm uses estimate...

Several deposition methods have been proposed for pre-deposition of reinforcement particle preparation surface metal matrix composite by Friction Stir Process. The method, which will effectively and homogeneously spread the within processed zone, be considered as best possible method.Homogeneous volumetric composites can fabricated conventional casting modified stir methods. process (FSP) used ...

Abstract In this paper, several analytical models are presented for the optimal design of a trapezoidal composite channel cross-section. The objective function is cost per unit length channel, which includes excavation and lining costs. To define system, variables including depth, width, side slopes, freeboard, roughness coefficients were used. constraints include Manning’s equation, flow veloc...