In this paper we determine bounds of the capacity region of a two-user multiple-access channel with Rayleigh fading when neither the transmitters nor the receiver has channel state information (CSI). We assume that the fading coefficients as well as the additive noise are zero-mean complex Gaussian and there is an average power constraint at the channel input for both senders. Results that we g...

The issue of channel state information at the transmitter is investigated using MIMO channel measurements and by deriving expressions for ergodic and outage capacity in a Rayleigh fading channel. Expressions for bit error rates in Rayleigh fading channels are also presented for orthogonal space time block codes and for beamforming where the bit error rates in the beamforming case follow from th...

HERE is a steady rise in the number of mobile system users in the recent times. In order to accommodate more users in a given bandwidth, the spectral efficiency needs to be improved. So, frequency reuse technique is being adopted to increase spectral efficiency [1]. However, frequency reuse causes inter channel and co-channel interference which is more than additive white Gaussian noise of many...

We consider the rationale behind the selection of coding schemes for wireless channels. Optimum coding schemes for this channel lead to the development of new criteria for code design, differing markedly from the Euclidean-distance criterion which is commonplace over the additive white Gaussian noise (AWGN) channel. For example, for a flat, slow-fading Rayleigh channel the code performance depe...

New bounds on the probability of bit error are presented for a coded communication system with binary antipodal modulation and soft-decision maximum-likelihood decoding over a correlated Rayleigh-fading channel. The bounds are closed-form expressions in terms of the code’s transfer function; they are illustrated by considering a system using convolutional encoding. A long-standing conjecture re...

A novel simple receiver structure for M -ary differential phase–shift keying (MDPSK) transmission over flat Rayleigh fading channels without channel state information is proposed. We apply convolutional codes for error correction and bit–interleaving as appropriate means to combat the effects of fading. In the decoding the hard decisions of the Viterbi algorithm are fed back to enable a more re...

Now a day’s wireless channels effecting due to fading is the main issue in communications. MIMO techniques enable higher spectral efficiency and improve robustness against channel fading. In this paper an effort has been made to illustrate the performance comparison of the Rayleigh & Rician fading channel models for MIMO system using MATLAB simulation. The Water filling algorithm has been imple...

This letter deals with the estimation of a flat fading Rayleigh channel with Jakes’s spectrum. The channel is approximated by a first-order autoregressive (AR(1)) model and tracked by a Kalman Filter (KF). The common method used in the literature to estimate the parameter of the AR(1) model is based on a Correlation Matching (CM) criterion. However, for slow fading variations, another criterion...

Following the approach introduced by Cavers and Ho, the performance of component-interleaved multidimensional constellations over the Rayleigh fading channel is evaluated analytically. Error probabilities are approximated by the union bound using an exact expression of the pairwise error probability. Simulation results show that this bound can be used effectively as a design criterion for the s...