Wireless Networks

5G networks are developed with the ambition to support a wide range of highly demanding services and application, by pushing the network capabilities to provide extreme performance, including the support of massively interconnected devices in the context of Machine Type Communication (MTC) [1]. MTC is a communication paradigm where a number of devices or ‘things’ are attached to the Internet or directly connected and communicate with each other with little […]

Game theoretic approaches in wireless networks One of the fundamental questions for 5G network architectures is whether the number of base stations (BSs) will be increased (Ultra-Dense Network) or will the current BSs be enhanced with an increased number of antennas and higher processing capabilities (massive MIMO). In most studies, both of these features are investigated together. Either way, the number of antennas will be significantly increased, hence several challenges […]

Ubiquitous coverage and high data rates are significant characteristics of future wireless systems. In traditional cellular systems, base-stations are located at the cell center to serve users, which are spatially distributed, across the cell. However, the dead spots within the cell caused by shadowing and penetration loss may significantly degrade the radio propagation strength of communication links, which in turn limit performance of the system. Such performance degradation is most […]

Communications over wireless medium are very appealing, because they enable mobility, however are special challenging due to the variation of the channel over the time and over frequency band. Channel is the physical medium that is used to send the signal from the transmitter to the receiver. The radio link between the transmitter and receiver may vary from the ones where transmitter and receiver are in simply line of sight […]

Current wireless communication technologies, such as Long Term Evolution (LTE) Advanced, adopt orthogonal frequency division multiplexing (OFDM) as the waveform candidate for the air interface. However, there are some key limitations, such as high peak to average power ratio (PAPR), low spectral efficiency, and strict orthogonality requirements, which significantly inhibit the performance of OFDM. To address the drawbacks of OFDM and satisfy the requirements of future communication networks, new waveforms […]