Recently, substantial attention has been paid to improve the spectral efficiency of communication setups using different spectrum sharing techniques. This paper aims to study the capacity of Rayleigh-fading spectrum sharing channels in the case where there is correlation between the fading channels. Assuming perfect channel state information, the channel capacity is obtained under both adaptive...

This paper presents a semi-blind algorithm for multiuser interference cancellation and fading amplitude estimation for downlink MIMO DS-CDMA systems with multipath fading channels. Taking advantage of the space-time information of the parametric multipath channel, the proposed algorithm first uses a space-time channel decoupler to suppress multiuser interference and then decomposes the channel ...

We study the effect of interference on the performance of coded FHSS systems. This is achieved by modeling the physical channel in these systems as a block fading channel. In the derivation of the bit error probability over Nakagami fading channels, we use the exact statistics of the multiple access interference (MAI) in FHSS systems. Due to the mathematically intractable expression of the Rici...

This paper focuses on the downlink system capacity in distributed antenna systems (DAS). Due to the complexity of actual wireless environments, a composite channel model is established which takes into account three factors, i.e., path loss, lognormal shadowing and Rayleigh fading. Based on the channel model, the probability density function (PDF) of the output signal-to-noise ratio (SNR) is de...

Space-time trellis codes provide both diversity gain and coding gain. There are two different design criteria proposed for spacetime trellis codes (STTCs), namely the rank and determinant criteria (RDC) and the Euclidean distance design criteria (EDC). In this paper, we present the performance of STTCs over Nakagami fading channels. Our results show that the STTCs designed for Rayleigh fading c...

This article deals with the derivation and analysis of the statistical properties of the instantaneous channel capacity of N*Nakagami-m channels, which has been recently introduced as a suitable stochastic model for multihop fading channels. We have derived exact analytical expressions for the probability density function (PDF), cumulative distribution function (CDF), level-crossing rate (LCR),...

We introduce a simple on-off fading discrete memoryless multiple-access channel model. The multiplicative fading for each user is modelled as a bernoulli random process, in which each symbol is multiplied by a random channel gain that is either zero or one. We find the capacity of this channel in the case that the receiver does not know the values of the channel gains.

In this paper we investigate the impact of different equalization techniques for digital communication systems that employ MPSK and MQAM modulation technique to transmit information such as color image over Rayleigh fading AWGN channel. Performance is analyzed in terms of bit error rate by MATLAB simulation. For the simulation of Rayleigh fading channel the different property values such as pat...

Performance analysis of maximal-ratio combining receive diversity scheme over Nakagami-0.5 fading channels and its application to the multiuser detection for direct sequence-code division multiple access systems is presented in this paper. A new M-estimator, which performs well in the heavy-tailed impulsive noise, is proposed to robustify the detector. Further, the performance of Eigen mode tra...

In this paper, we investigate the performance of transmit diversity technique operating in IS-136 T D M A systems where the Doppler frequency can be as high as 184Hz. Transmit diversity transforms a pat fading channel into a frequency selective fading channel, thus we use finite length decision feedback equalizers to estimate the desired signal at the receiver. The channel parameters are traine...