Mirza Hamza

BEP/SEP and Outage Performance Analysis of -Branch Maximal-Ratio Combiner for - Fading

Maximal-ratio combiner (MRC) performances in fading channels have been of interest for a long time, which can be seen by a number of papers concerning this topic. In this paper we treat bit error probability (BEP), symbol error probability (SEP) and outage probability of MRC in presence of 𝜅-𝜇 fading. We will present 𝜅-𝜇 fading model, probability density function (PDF), and cumulative distribution function (CDF). We will also present PDF, CDF, and outage probability of the L-branch MRC output. BEP/SEP will be evaluated for broad class of modulation types and for coherent and noncoherent types of detection. BEP/SEP and outage performances of the MRC will be evaluated for different number of branches via Monte Carlo simulations and theoretical expressions.

Outage Performance of L-Branch Maximal-Ratio Combiner for Generalized k-μ Fading

Maximal-Ratio combiner (MRC) performances in fading channels have been of interest for a long time, which can be seen by a number of papers concerning this topic. Most of these papers treat Rayleigh, Nakagami-m, Hoyt, Rice or Weibull fading. This paper treats outage performances of MRC in presence of generalized kappa- mu fading. In this paper, we will present kappa- mu fading model, probability density function (PDF), cumulative distribution function (CDF), expression for n-th order moment and outage probability. We will also present PDF, CDF and outage probability of the L-branch MRC output. Outage performances of the MRC will be presented for different number of branches via Monte Carlo simulations and theoretical expressions.

Verification of OFDM Error Floor Prediction in Time-Dispersive LTE FDD DL Channel

In this paper, we complement the developed OFDM error floor prediction analysis and the corresponding Monte-Carlo simulations results by more comprehensive tests specifically referencing the LTE FDD downlink environment that is for this purpose simulated in controlled lab conditions using state-of-the-art industry-standard software simulation test tool. The validity of the model was confirmed by the achieved results that closely match the ones coming out of the earlier obtained model-specific and OFDM-basic Monte Carlo simulations.

Symbol Error Probability Analysis of L-Branch Maximal-Ratio Combiner for Generalized eta-mu Fading

Maximal-Ratio Combiner (MRC) performances in fading channels have been of interest for a long time, which can be seen by a number of papers concerning this topic. Most of these papers treat Rayleigh, Nakagami-m, Hoyt, Rice or Weibull fading. This paper treats symbol error probability (SEP) performances of MRC in presence of generalized eta-mu fading. In this paper, we will present eta-mu fading model, and expressions for SEP of the L-branch MRC output. SEP will be treated for a broad class of modulation types and for non-coherent type of detection. SEP performances of the MRC will be presented via Monte Carlo simulations and theoretical expressions.

Verification of OFDM error floor in time-dispersive LTE FDD DL channel

In this paper, the state-of-the-art laboratory environment is presented that is aimed for experimental verification of the earlier obtained analytical OFDM error floor model but now in concrete LTE FDD downlink channel conditions, which are for this purpose hardware and software simulated in the Communications Systems Laboratory of the University of Dubrovnik. At this point, the very preliminary verification of the earlier derived error floor formula is reported as the test results achieved by means of the industry-standard simulation tool closely match the ones coming out of the earlier model-specific basic Monte-Carlo simulations.

Modern spectrum management: Survey of 3G network traffic in Bosnia and Herzegovina

The rapid growth of connected devices worldwide has dramatically increased demand for available spectrum. The changeover to spectrum efficient digital terrestrial TV transmission freed up large blocks of spectrum. This paper aims to offer the results of the analysis of 3G mobile network usage in terms of traffic based on the case of dominant mobile operator in Bosnia and Herzegovina (B&H). By this it is identified whether the demand for more radio spectrum is legitimate. In order to satisfy the requirement for extension of radio spectrum aimed for broadband services the broadcast spectrum (470 - 700 MHz) has been investigated. The rest of the UHF broadcast band (700 - 860 MHz) was not considered since it is specified as the Digital Dividend and hence was not a subject of dynamic access to the spectrum investigation. All results have been compared to the relevant researches conducted in some European, US, Asian and African countries. Ultimately the analysis results would help the modernization and enhancement of spectrum management proposing the concept of spectrum sharing and dynamic spectrum access to the national regulatory authority in B&H.

Analysis of OFDM error floor in indoor channels by stochastic modeling

In this paper, we propose a model for estimating the error floor in a small-time-dispersion environment - typically indoor, where both channel and overall OFDM symbol are represented stochastically. The developed novel model for the error floor prediction involves modified common channel time dispersion parameters as well as the ones characterizing the OFDM signal. The validity of the model was confirmed by the results of the corresponding Monte-Carlo simulations.

An approach to cell signal coverage reliability in presence of different fading models

Recently, papers have appeared treating channels in presence of composite fading. Due to composite fading PDF complexity, gamma shadowing distribution instead of lognormal is proposed, to simplify analytical expressions. In order to estimate cell coverage in recent papers, only shadow fading model subdued to lognormal distribution was observed. In this paper, both mentioned models for cell coverage estimation are treated and compared: model with lognormal shadowing and model based on shadow fading which is subdued to gamma distribution (gamma shadowing). The impact of multipath fading, as part of path loss has been analyzed and expressed through composite fading model (Nakagami-m multipath/Gamma shadow fading). For all these models analytical closed forms for reliability parameters are derived (cell edge reliability and cell area reliability). Based on these results, reliability parameters in gamma shadowing and composite fading models are compared to a model which respects presence of lognormal shadowing, and presented in graphs. Also a simulation in order to compare different shadowing models and their impact on actual cell coverage has been made. In order to analyze signal coverage, cell radius estimation has been chose as relevant parameter for coverage verification and the effects of limited number of measured strength samples on cell radius estimation, using both proposed distributions, has been analyzed.

BER-based BLER prediction for LTE FDD DL channel with small delay dispersion

In this paper, we derive a prediction model for the block error rate (BLER) of an AWGN channel as a function of (known) bit error rate (BER) for transmission over small-delay-dispersion channels, such as indoor, where cyclic prefix protection mechanism reliably prevents inter-symbol interference due to multipath. By adopting hypergeometric rather than common binomial distribution of erroneous bits within a data block, a novel BLER prediction formula is derived and validated first by model-specific MC simulations. Then, it is verified in LTE FDD downlink channel conditions, using an industry-standard software simulation tool. The achieved test results are shown to match the block error rate prediction coming out of the developed model, within expected limits.