In this paper, we propose an online SNR estimation scheme for generalized fading channels. We derive the SNR estimate based on a statistical ratio of observables over a block of data, when the channel undergoes Nakagami fading. An online SNR estimator for AWGN channels has been derived recently by Summers and Wilson. Our SNR estimation scheme in this paper is for a general Nakagami fading chann...

Zheng and Barton developed a convenient signaling scheme (orthogonal on-off BPSK (OBPSK)) with a simple one-shot linear decorrelating detector (LDD) for near–far resistant detection in asynchronous DS/CDMA systems. This paper studies the performance of the OBPSK LDD system over a frequency-nonselective and slowly fading channel. Three types of channel model are considered, namely Rayleigh fadin...

In this paper, a constant total system’s allocated bandwidth hybrid direct-sequence/fast frequency hopping code-division multiple-access (DS/FFH-CDMA) cellular system, when operating in a Rayleigh fading environment, is examined. The described analysis leads to a novel-closed form expression for the probability density function (pdf) of the channel capacity per user, which relates the pdf of th...

An effort has been made to illustrate the performance of the Rayleigh fading channel models by using Qual net simulator in terms of Throughput and PDR. A scenario has developed here for the Rayleigh fading channels, with various parameter. The parameters such as data rate and speed of nodes play very important role in the performance analysis and design of the mobile ad-hoc network over the mul...

This paper presents an overview of adaptive equalization used in multiple-input-multiple-output (MIMO) wireless systems. In this paper, we consider two-user transmission over a Rayleigh frequency selective fading channel, in which the Channel State Information (CSI) is known by the receiver. Subject to an average transmit power constraint, we study the performance with Rayleigh fading. Besides ...

By using an approach other than usual, we derive an exact closed-form expression for the symbol error probability (SEP) for arbitrary rectangular M-QAM signaling over flat Rayleigh fading channels. This has never been achieved before as the best-known SER for QAM up to date is only the results obtained for the square M-QAM. Our rectangular M-QAM result can be readily extended to find the result...

We examine a two–rate communication system where the transmission is suspended if the received SNR falls below a given threshold. We assume an FDD system and derive novel closed–form bit error probabilities in the presence of feedback errors in flat Rayleigh fading environment for single antenna transmission, orthogonal space–time block coding and transmit antenna selection. A single–user two–r...

Abstract In recent years, there has been considerable interest in the use of CDMA in mobile communications. Bit error rate is one of the most important parameters in the evaluation of CDMA systems. In this paper, we develop a technique to find an accurate approximation to the probability of bit error for asynchronous direct–sequence code division multiple–access (DS/CDMA) systems by modeling th...

In this correspondence, we establish a partial ordering framework to compare flatfading channels in a capability sense, which is based on the relative dominance of their mutual information functions over a convex set of input distributions. For this purpose, we address the effect of the line-of-sight and scattering components on the mutual information of flat-fading channels. For example, we sh...

We present a new closed-form formula for the ergodic capacity of multiple-input multiple-output (MIMO) wireless channels. Assuming independent and identically distributed (i.i.d.) Rayleigh flat-fading between antenna pairs and equal power allocation to each of the transmit antennas, the channel capacity is expressed in closed form as finite sums of the exponential integrals which are the specia...