Node Selection Technique for Distributed Beamforming in Green Cognitive Radio Networks

The wide deployment of wireless sensor nodes for varieties of applications calls the need for distributed beamforming as a cooperative scheme to efficiently use spectrum, to improve communication range and to save precious battery power during transmission. Given that there are a large set of cooperative cognitive radio users, ensuring the...

Interference cancellation techniques for low power wireless sensors

Non-coherent on-off keying (OOK) receivers are preferred in ultra low power (ULP) wireless devices as they consume less power when compared to receivers based on other modulation schemes. However, these devices are highly susceptible to co-channel interference (CCI). Therefore, interference cancellation (IC) techniques for ULP non-coherent OOK...

A Study On Wavelet Packet Based Algorithm For Representation of Wireless Channel

Wireless telecommunication services are growing rapidly both in terms of the underlying technology as well as in the nature of the applications. The trends point to further growth in the foreseeable future. However, the dynamic nature of the wireless channel places fundamental limitations on the performance of wireless communication system....

Synchronization Methods for Wavelet Packet Multicarrier Modulation

Wavelet Packet based Multi-Carrier Modulation (WPM) offers an alternative to the well-established Orthogonal Frequency Division Multiplexing (OFDM) as an efficient multicarrier modulation technique. It has strong advantage of being generic transmission scheme whose actual characteristics can be widely customized to fulfill several requirements...

Relay Selection and Resource Allocation in Cooperative Wireless Communication Networks

Cooperative communication is a technique to use nodes in the wireless network as relays to forward information to the destination. Cooperative communication technique relies on the relay selection and power allocation process to optimize its performance since not all available nodes are beneficial to use for forwarding. Game theory is a branch...

Channel Equalization for Wavelet Packet Modulation

This thesis work presents design and implementation of a channel equalizer for wavelet packet modulation.

Channel Equalization for Wavelet Packet Modulation

Wavelet Packet Modulation (WPM) is a multicarrier modulation technique like the well-established Orthogonal Frequency Division Multiplexing (OFDM). It has several advantages over OFDM, such as flexibility of operation and excellent localization in frequency. The Channel Equalization for WPM is new and an unexplored research area. It is also...

A Study on Frequency Dependency and Spatial Modeling of Wireless Channels

Peak-to-Average Power Ratio Reduction Techniques for Wavelet Packet Modulation

Wavelet Packet Modulation (WPM) is a novel multicarrier modulation technique and a promising alternative to the well established Orthogonal Frequency Division Multiplexing (OFDM). WPM has been shown to be an efficient technique with interesting features like adaptation and flexibility and improved characteristics in comparison to OFDM. A major...

Application of Wireless Sensor Networks in Power System Monitoring and Control: A Study on Wireless Channel, Interference and physical layer Issues

The Dutch electricity grid is considered one of the most reliable in the world. However in the near and far future, significant changes will occur, that will endanger its stability, reliability and safety. Introduction of an embedded wireless sensor network, to determine the state of the power system at any time, in order to cope with these...

On Wavelet Based Spectrum Estimation for Dynamic Spectrum Access

One of the important functionalities of Dynamic Spectrum Access is spectrum estimation. Accuracy and speed of estimation are the key indicators to select the appropriate spectrum estimation technique. In this thesis work, the possibility of employing wavelet packet decomposition as a basis for a new spectrum estimation approach is investigated....

Ray-based Propagation Modeling for OFDM-based Mobile Networks

The demand for high data rate is ever increasing. OFDM-based wideband systems such as LTE and WiMAX are being employed as they can provide such high data rates. The performances of these systems not only depend on SNR but also on wideband arameters such as delay spread and angular spread. Obstacles (buildings, trees, vehicles, lamp posts, etc.)...

Interference Analysis, Measurements and Performance Evaluation of IEEE 802.11n in the presence of other IEEE 802.11b/g/n WLANs

The IEEE 802.11n standard is a promising technology for near future Wireless LAN's. By utilizing enhanced techniques like MIMO communication and OFDM digital modulation extremely high data rates over large distances are possible for wireless communications. Predecessors like 802.11b/g standards are succesfully outnumbered and a strong competitor...

A Framework For Coping With Intra-Node Adjacent Channel Interference In Multi- Channel Multi-Radio Mesh Networks

Typically, in a wireless data network, all devices use the same channel (i.e. the same frequency) so that they can easily communicate with each other. However, as node density increases, the throughput share of each device decreases due to contention of the wireless medium. It seems that the capacity problem in wireless mesh networks can be...

A Study of Synchronization Issues of Wavelet Packet based Multicarrier Modulation

Wavelet Packet based Multi-Carrier Modulation (WPMCM) offers an alternative to the well-established OFDM as an efficient multicarrier modulation technique. It has strong advantage of being generic transmission scheme whose actual characteristics can be widely customized to fulfill several requirements and constraints of advanced communication...

Groupwise Multiuser Detection in a Multirate DS-CDMA System

This report presents the performance of groupwise successive interference cancellation (GSIC) within a direct sequence code division multiple access system (DS-CDMA). Within the groups, matched filter and PIC receivers are used for detection of the users. A multirate DS-CDMA system model, based on a single rate system is presented. Although the...

Performance evaluation of multi-user detectors for DS-CDMA systems over multi-path Rayleigh fading channels with AWGN

The third generation of the mobile communications network is the Universal Mobile Telecommunications System (UMTS). One of the multiple access techniques will be Direct Sequence Code Division Multiple Access (DS-CDMA). This report evaluates the performance of different detectors for DS-CDMA systems for the specifications of the UMTS environment...