Abstract—In order to estimate a fading channel characteristics, a pilot signal is propogated with traffic channel. Fading channel parameter estimation is of paramount importance as it may be utilized to design different equalization techniques. It may also be utilized to allocate weights of rake receiver to sturdiest multipaths as well as coherent reception and weighted combination of multipath...

| MultiCarrier CDMA (MC-CDMA) schemes resolve the frequency selectivity in multipath fading channels and have good spectral properties. Spreading the information over many subcarriers adds exibility to the system and a redundancy between subcarriers that can be combined nicely with the derived frequency diversity out from the fading channel. In this paper the performance of a MC-CDMA scheme ove...

This paper presents a theoretical analysis of the intercell interference statistics and capacity of CDMA systems in a multipath environment where every multipath signal is affected by Rayleigh fading. The power control is assumed to be fast enough to compensate the rapid fluctuations of the radio channel due to multipath fading. Unlike many previous works, mobile users are assumed to connect to...

Digital modulation plays a significant role in efficient wireless communication. It allows the transmission of digital data via air on high frequency carrier waves. The worst case communication channel is usually in the urban environment where there are many obstacles. Due to the obstacles and reflectors, the transmitted signal arrives at the receiver from various directions over a multiplicity...

In the mobile radio environment, signals are usually impaired by fading and multipath delay phenomenon. In such channels, severe fading of the signal amplitude and inter-symbol-interference (ISI) due to the frequency selectivity of the channel cause an unacceptable degradation of error performance. Orthogonal frequency division multiplexing (OFDM) is an efficient scheme to mitigate the effect o...

The performance of coherent antipodal chaos-shift-keying (CSK) communication systems in a multipath channel is evaluated. A two-ray independent Rayleigh fading channel model is considered. Also studied is the performance when a Rake demodulator is employed. The analytical method for computing the bit error rate (BER) of such systems is derived. The theoretical BER results are presented and comp...

An important feature of the propagation channel considered here is that the mean or coherent signals do not vanish. Such is the case for what is called in wireless literature Rician fading channel where in addition to incoherent signals there is a significant, nonfluctuating multipath component. The Rician fading channel arises where there is line-of-sight (direct path) between transmitter and ...

In wireless communication the effect of multipath as well as shadowing takes place simultaneously over the channel and this phenomena leads to composite fading. G-distribution is frequently encountered distribution in wireless fading environment. Combination of multipath fading and shadowing model are used as composite fading model. This composite fading model is named as Gdistribution. G-distr...

Multicarrier Code Division Multiple Access Schemes (MC-CDMA) have been recently introduced in existing CDMA based systems to improve security, data transmission rate and to minimize Inter Symbol Interference (ISI). CDMA experiences severe multipath fading which badly affects its performance. By transmitting identical narrowband DirectSequence (DS) waveforms using frequency diversity, in paralle...

In wireless communication systems diversity combining technique is one of the most important technique for combating the multipath effects of fading to improve the system's performance and to increase its channel capacity. This paper explores the post-detection-combining (PDC) diversity issues for orthogonal frequency division multiplexing (OFDM) over a Rayleigh fading channel. The performance ...