Knowledge of the refractivity index in the lower atmosphere is very important in the design, transmission and performance analysis of line-of-sight (LOS) terrestrial links. In oceanic environments, radio wave propagation is affected by the high variability with space and time of the meteorological parameters. Radiosonde data have been used in the analysis of the effect of climatic conditions in...

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...

In this paper the choice of DLL parameters is studied with special focus on multipath and Doppler sensitivity. The envisaged application is code tracking on navigation receivers and the multipath fading environments defined for next generation navigation systems are considered. Given the particular properties of these propagation environments, multipath estimating delay lock loop is shown to ha...

The constrained MMSE (CMMSE) receiver, which has been developed for flat fading channels [6], is applied to each finger of a RAKE receiver in multipath fading environment. The optimal filter coefficients of the CMMSE receiver in steady state are derived. The results indicate that the performance of CMMSE receivers can be degraded by interpath interference (IPI) when the channel fade rate is slo...

A/M~Tw!,In this paper, a multicarrier DS/CDMA system with adaptive antenna array is proposed for a multipath fading channel. A multipath fading channel is modeled as a Nakagami-m fading channel. The performance is evaluated in terms of bit error probability, and system capacity for the multicarrier DS/CDM A system with adaptive antenna array is estimated. From the analytic and simulation result...

In this paper the wireless communication system with the receiver consisting of an automatic frequency control (AFC) loop is considered. Proposed system is subjected to k-μ multipath fading environment and single interference. Performance measures such as average switching rate (ASR) and mean time to loss of lock (MTTL) are investigated. Furthermore, closed form expressions for ASR and MTTL are...

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...

The ability to simulate various mobile radio channel impairments, particularly, multipath fading, in the products design phase, before equalizer algorithms have been implemented as custom ASICs, is critical. This paper presents the test procedure, developed for type-approval testing of a multipath fading simulator, as well as corresponding practical measurement results in terms of spurious sign...

Adaptive linear minimum mean square error (LMMSE) receivers for frequency selective fading channels are developed by modifying the constrained LMMSE receiver in [6]. In particular, additional constraints regarding interpath interference are imposed on the constrained optimization in [6], and simple adaptation rules are derived by converting the constrained MMSE problem into an unconstrained opt...