At WRC-07, the frequency band 3500 MHz has been allotted for the next generation of mobile International Mobile Telecommunication-Advanced (IMT-Advanced). Meanwhile this band is already in used by fixed services, which means that harmful interference probability may be transpired. In this paper, the coexistence between the two services in various geographical deployment areas (dense urban, urba...

This paper sheds the light on coexistence and sharing between high altitude platform system (HAPS) and Fixed Services (FS) as a recently critical issue due to the spectrum shortage. International Telecommunications Union Radiocommunications sector (ITU-R) allocated the 5850-7075 MHz band for the operation of HAPS along with existing FS services. Therefore, coexistence and sharing requirements l...

In this paper, we propose an LDPC-based Frequency Domain (FD) turbo receiver to improve the channel estimates iteratively in a Single Carrier Frequency Domain Equalization (SC-FDE)1 uplink system in the presence of intra and inter-cell interference. Upper layer co-ordination is necessary to keep the average received power of the co-channel Out of Cell Interferers (OCIs) low. Such control can be...

I. INTRODUCTION Wireless sensor networks are a quickly growing area for research and commercial progress. A wireless sensor network (WSN) is a collection of various data nodes deployed in a network. WSN is useful for military, environmental, and scientific applications to name a few. It is commonly composed of various wireless nodes that are distributed in a certain fashion to cover the area to...

One of the key challenges for future orthogonal frequency division multiple access-based networks is inter-cell interference coordination. With full frequency reuse and small inter-site distances, coping with co-channel interference (CCI) in such networks has become increasingly important. In this article, an uplink interference protection (ULIP) technique to combat CCI is introduced and invest...

Wireless network widely used today include, cellular network, wireless mesh network (WMNs), wireless local area network and personal area network. The increasing demand for these networks has turned spectrum into a precious resource. For this reason, there is always a need for methods to pack more bits/Hz. A particular solution is to use multiple antenna at both transmitter and receiver side. S...

Elimination of co-channel interference in a multiple antenna receiver scenario has long been considered a beamforming problem. Such a solution becomes largely ineffective when the interference source is almost co-located with the desired signal source. Interference elimination cannot thus be achieved via beamforming alone. If the multipath signatures of the desired and interfering signals can b...

Cellular data and communication networks are usually modeled as graphs with each node representing a base station in a cell in the network, and edges representing geographical adjacency of cells. The problem of channel assignment in such networks can be seen as a graph multicoloring problem. We survey the models, algorithms, and lower bounds for this problem. — 1.1 INTRODUCTION In a cellular ne...

Recently, space-division multiple-access (SDMA) schemes [1], [2] have been proposed to increase the capacity of wireless communication systems by simultaneously transmitting and receiving multiple co-channel signals through different spatial channels. In this paper, we address the uplink (remote users to the base station antenna array) blind channel and sequence identification problem for an SD...

Interference is one of the major causes for performance degradation in wireless networks. Channel assignment algorithms have been proven successful to decrease the networkwide interference by using non-overlapping channels for otherwise interfering links. However, external co-located networks and devices are usually not considered in the channel assignment procedure, since they are not under th...