In this paper, an equalization technique for OFDM and MC-CDMA systems in a time-varying multipath fading environment is described. A loss of subchannel orthogonality due to time-variation of multipath channels leads to interchannel interference (ICI) which increases the error oor in proportion to Doppler frequency. A simple frequency domain equalizer which can compensate the e ect of time-varia...

In this paper, the problem of estimating the channel parameters of a new user in a multiuser code-division multiple-access (CDMA) communication system is addressed. It is assumed that the new user transmits training data over a slowly fading multipath channel. The proposed algorithm is based on maximumlikelihood estimation of the channel parameters. First, an asymptotic expression for the likel...

Abstract— The performance of the noncoherent differential chaos-shift keying (DCSK) communication system over a multipath fading channel with delay spread is evaluated. Analytical expressions of the bit error rates are derived under the assumption of an independent Rayleigh fading two-ray channel model. Analytical and simulated results are presented and compared. The multipath performance of th...

In this paper, we analyze the Bit Error Rate (BER) performance of Golden coded Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) system over Rician multipath fading channel. We also compare the performance of the MIMO-OFDM system using Golden code in Rayleigh and Rician multipath fading channels. We discuss the effects of the presence of line-of-sight (LoS) c...

Wireless communication system operating over interference limited, α-k-μ multipath fading channel is considered. Closed form expressions for cumulative distribution function and level crossing rate of the ratio of two k-μ random variables and the ratio of the two α-k-μ random variables are calculated. These expressions are used for evaluation level crossing rate of wireless communication system...

In a multipath fading channel, the transmitted signal travels through several different paths to the receiver. In each path, amplitude and phase of the signal vary in a random manner. It is common to consider the number of paths as a large constant and to model random fluctuations of the phase by the uniform probability density function (PDF). However, these assumptions are not realistic in man...

We address the problem of joint common-dedicated pilots downlink user dedicated channel estimation for W-CDMA receivers, in particular in the presence of dedicated channel transmit beamforming. The optimal dedicated channel estimate is derived via a three steps procedure, consisting of building brute FIR dedicated and common channel estimates on a perslot basis exploiting the dedicated and comm...

Multipath propagation in underwater acoustic channels causes intersymbol interference in the transmission of digital communication signals. An increase of the transmission rate on a multipath channel results in longer intersymbol interference, which ultimately limits the performance of a phase-coherent digital communication system. Recent experimental results, however, show a seemingly surprisi...