The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper a composite analytical model of DS-CDMA wireless communication system considering multipath Nakagami fading along with Doppler frequency shift, tracking jitter, local oscillator frequency offset and multi-access interference (MAI) for different PN sequences is presented. The analysis presents the development of a novel approach to find the pdf (probability density function) of the signal...
The performance of the system with maximal ratio combining and multiuser scheduling is studied in the multiuser uplink in the presence of unequal power cochannel interferences from other cells. The channels of useful and interference signals are assumed to be Nakagami-m and Rayleigh fading. The closed form expressions for outage probability and average symbol error ratio (ASER) of system are derived...
Exact average capacity results for L-branch coherent equal-gain combining (EGC) in correlated and uncorrelated fading channels are not known. This paper develops a novel framework (approach) for capacity analysis of L-branch EGC in generalized fading channels. In addition, Gamma shadowed generalized Nakagami-m fading model is proposed in order to statistically model the fading environments in high...
This paper investigates the outage capacity performance for cooperative wireless communication schemes over independent nonidentical Nakagami-m fading channels with arbitrary fading parameters. The network consists of multiple dual-hop nonregenerative relays in addition to a direct path to achieve the cooperative diversity with maximal ratio combining at the destination. Closed form expressions for...
In this article, we have studied the statistical properties of the capacity of Nakagami-m channels when spatial diversity combining, such as maximal ratio combining (MRC) and equal gain combining (EGC), is employed at the receiver. The presented results provide insight into the statistical properties of the channel capacity under a wide range of fading conditions in wireless links using L-branch diversity...
A unified analytical framework for evaluating the performance of maximal ratio combining (MRC) and orthogonal space-time block coding (OSTBC) over generalized fading channels is presented. The basic motivation for developing such a framework pertains to analyzing the distribution of a sum of squared random variables (RVs) belonging to different families of fading distributions. Following a novel analytical...
The error probability of DPSK signals in Nakagami fading with EGC diversity reception is analyzed. The error rate is expressed as a (L + 1)-fold integral that contains only simple mathematical functions for L channel reception. The multiple integrals are easily evaluated with the Gauss-Legendre quadrature. Numerical values for the error rates of binary, quaternary and octonary DPSK signals are presented...
A novel diversity combination that unifies the switch-and-stay combining (SSC) and selection combining (SC) is proposed, where a window with two decision thresholds is used for the switch/selection of diversity branches. At the beginning of a combining procedure, the branch with a larger signal-to-noise ratio (SNR) is selected as in the SC. If the SNR of the branch currently in use is larger than...
In this paper, we analyze the performance of cooperative diversity wireless networks using amplify-and-forward (AF) or decode-and-forward (DF) relaying over independent, non-identically distributed Nakagami-m fading channels. We derive the symbol error probability (SEP) using the moment generating function (MGF) of the end-to-end signal-to-noise-ratio (SNR) at the destination. In AF relaying, and...
The main focus of this paper is to investigate the downlink outage probability of the distributed antenna system (DAS) over shadowed Nakagami-m fading channels. In the analysis, by making use of the moment generating function (MGF), this paper first derives the probability density function (PDF) of the output signal to noise ratio (SNR) after maximal ratio combining (MRC) at the receiver. Further,...
In this paper the performances of generalized selection combining (GSC) was observed. Combiner has three inputs. The two strongest signals are isolated and added. For this combiner the probability density function of the output signal, the outage probability and the error probability was analytically derived and graphically presented. The presence of Hoyt (Nakagami-q) fading at the inputs of generalized...
Cognitive radio is a novel technology which can efficiently improve the spectrum utilization. Spectrum sensing is one of the most critical components of cognitive radio technology. In this paper, we investigate the performance of spectrum sensing using diversity technique. Energy detection is utilized to check the presence of primary signal. For the case where equal gain combining technique is utilized...
The end-to-end performance of multi-branch dual-hop wireless communication systems with non-regenerative relays and equal gain combiner (EGC) at the destination over independent Nakagami-m fading channels is studied. We present new closed form expressions for probability distribution function (PDF) and cumulative distribution function (CDF) of end-to-end signal to noise ratio (SNR) per branch in terms...
In this paper, the performances analysis of cooperative-diversity networks using adaptive decode-and-forward (DF) relaying over independent non-identical flat Nakagami-m fading channels is investigated. We derive closed-form expressions for the error probability, outage probability and average channel capacity, and analyze their dependence on the channel parameters. In adaptive DF relaying, among...
We present a novel and accurate approximation for the distribution of the sum of equally correlated Nakagami-m variates. Ascertaining on this result we study the performance of Equal Gain Combining (EGC) receivers, operating over equally correlating fading channels. Numerical results and simulations show the accuracy of the proposed approximation and the validity of the mathematical analysis.
Detection of an unknown deterministic signal by using an energy detector is of promising for cognitive radio networks. In this paper, a new approach is proposed to analyze the performance of the energy detector. It is based on the contour integral representation of the Marcum-Q function and the use of the moment generating function (MGF) of the signal-to-noise ratio (SNR). A new decision variable...
Blind sensing for identifying unused frequency bands is of particular interest in cognitive radio and ultra wide-band applications. Energy detection is one such method proposed to identify the presence of an unknown band-limited deterministic signal. In this paper, by using an alternative series representation of the Marcum-Q function, the exact average detection probability over the Nakagami-m fading...
In this paper, error performance of a cooperative relay system using amplify and forward method is investigated when channels between source, relay and destination have cascaded Nakagami distribution. General pairwise error probability of the system is derived and effective and asymptotic diversity orders are investigated for some special cases. Bit error probability curves are obtained by computer...
In this paper, we explore the relationship between the Lauricella hypergeometric functions (FA, FB, and FD) and the performances of linear diversity combining schemes in Nakagami fading channels with arbitrary parameters. We consider maximal ratio combining, selection combining, and equal gain combining of an arbitrary number of independent Nakagami faded diversity branches. Specifically, we show...
In this manuscript, we propose an accurate framework for the analysis of cooperative dual-hop wireless systems over fading channels, which use an Amplify and Forward (AF) relaying mechanism with fixed-gain relays. In particular, the proposed framework provides either exact results or very accurate bounds for computing the Moment Generating Function (MGF) of the end-to-end Signal-to-Noise Ratio (SNR)...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.