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Internet of things (IoT) integrate the technologies such as sensing, communication, networking and cloud computing in wide range monitoring zone. For applications of IoT, the most appropriate monitoring network is wireless sensor networks (WSN). It is most important to develop energy efficient cluster head (CH) selection scheme to increase the network lifetime of WSNs. It is most crucial to save the...
In the wireless world, the devices face a unique challenge of energy scarcity. Unlike the wired systems, there is no continuous wired energy resource available to power the ongoing wireless communication. Instead, the entire system runs on wireless batteries. Taking a step further in this field, the concept of energy harvesting is introduced a while ago. This paper combines the concept of harvesting...
In cellular communication, placement of evolved node base station (eNB) is an important issue. It determines the cost to construct, capacity, coverage ratio and quality of service (QoS). In 2G and 3G standards, eNBs have similar coverage range. The idea of heterogeneous network (HetNet) is launched in long term evolution-advanced (LTE-A), where the network contains different eNBs of different coverage...
The recent development of mobile communications, has led to the increment of number of users that network operators need to serve. To cope with the increasing demand of users, the deployment of evolved node base stations (eNB) is an open issue in the present scenario. In our work, focus is on developing a cost-effective and power-efficient eNB deployment framework for Heterogeneous Cellular Networks...
In 4G and beyond 4G cellular communication systems, multi-hop relay network (MHR) plays a vital role. Improper deployment of relay station (RS) in MHR network creates some severe issues. The conventional studies on RS deployment have not considered the practical issue of link overloading. In this paper, a two-phase, fuzzy based selection and deployment scheme for RSs is proposed by considering link...
Recent wireless standards prefer orthogonal frequency division multiplexing (OFDM) along with multiple input multiple output (MIMO) to offer high spectral efficiency services for any time anywhere environment. The full advantages of MIMO-OFDM is accessible only when there exist perfect channel information. Improper channel estimation leads to poor quality. In this work, we have developed a multi layered...
Femto cell networks are becoming very popular in indoor home and small business environments. Femto cells will introduce more interference since all of them work on same frequency band. This limits the capacity of femto cell users. Femto cells may also introduce interference to macro cell users, this again reduces the capacity of Macro cell users. The interference has to be mitigated to improve the...
Optimum deployment of Relay Station (RS) is considered as the most important issue especially for the users near cell boundary. The Multi hop Relay (MHR) network introduces the RS for the purpose of extended coverage and increased throughput. The main objective of this work is to provide a better Quality of Service (QoS) with a minimum deployment cost. In this paper, we identify the candidate positions...
Present wireless technologies demand high quality broadband services even at cell edges. Multi-hop relay (MHR) network is one of the suitable solutions for the above demands. The standards like IEEE 802.16j and Long Term Evolution (LTE) are using relay architecture which mainly focuses on capacity and coverage improvement. In recent days, multi antenna MHR networks are becoming more popular. However...
Multiple antennas at the transmitter side and/or at the receiver side can improve the capacity and/or quality of reception in a fading environment. In this paper, a comparative study of various diversity schemes with and without feedback is presented. Simulation results show that maximal ratio combining (MRC) and transmit beamforming provide maximum performance. The other focus of this paper is to...
For Multiple Input Multiple Output (MIMO) systems, antenna selection is a must since the Radio Frequency (RF) chains connected with antennas consumes a lot of power. This paper studies the effect of antenna selection at transmitter side since the base station power consumption is around 60–80% of the entire wireless system. The TAS is performed by a simple and computationally efficient NBA scheme...
In this paper, a new adaptive HAST scheme is proposed for Space Frequency Block Coded (SFBC)-Orthogonal Frequency Division Multiplexing (OFDM) system. This HAST scheme uses subcarrier by subcarrier antenna selection. The performance of the proposed scheme is analyzed for different antenna configurations with average Signal to Noise Ratio (SNR) gain and Bit Error Rate (BER) parameters. The simulation...
OFDM is a Multicarrier modulation (MCM) technique, which in used in 4G standards. In OFDM systems, symbols are transmitted in parallel on several narrowband subcarriers, which are overlapping and orthogonal to each other. OFDM is superior to other systems because it incurs zero Inter Symbol Interference (ISI) or less amount of ISI which can be compensated by a single tap equalizer. OFDM is advantageous...
High-data-rate transmission can be achieved by Spatially Multiplexed (SM) MIMO systems. Spatial demultiplexing at the receiver end is a difficult task. Thus, several research works has been developed for demultiplexing and decoding. In this paper three signal detection methods namely Zero-Forcing (ZF), Minimum Mean Squared Error (MMSE) and Maximum Likelihood (ML) are implemented. In Zero-Forcing method,...
Recent wireless standards are expected to offer very high data rate. They use OFDM for high data rate communication. OFDM severely suffers by Inter Carrier Interference (ICI) problems. A common solution for ICI reduction and throughput improvement has been proposed in this paper. This paper presents a novel technique to estimate CFO in Orthogonal Frequency Division Multiplexing systems using Viterbi...
Orthogonal Frequency Division Multiplexing (OFDM) is the technology which is used in 4G based high data rate applications. The standards like Long Term Evaluation (LTE), Long Term Evaluation Advanced (LTE-A) and Wi-MAX promise to offer a high data rate at high mobility. But the mobility destroys the orthogonality of OFDM systems and also reduces the spectral efficiency. The orthogonality loss due...
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