in this paper, an interference management for multi-beam satellite network to enhance spectral efficiency is studied. first, a two-satellite for future generation satellite network using cognitive radio technology is provided.this network is composed of a secondary satellite and aprimary satellite where the primary satellite system does not suffer from severe destructive interferences coming fr...

Cognitive Radio (CR) Mitola (2000) is a promising technology to improve spectrum utilization of wireless communication systems. Current investigations in CR have been focused on the physical layer functionality. The cognitive radio, built on a software-defined radio, assumes that there is an underlying system hardware and software infrastructure that is capable of supporting the flexibility nee...

In this paper, we investigate how distributed reinforcement learning-based resource assignment algorithms can be used to improve the performance of a cognitive radio system. Today’s decision making in most wireless systems include cognitive radio systems in development, depends purely on instantaneous measurement. Two system architectures have been investigated in this paper. A point-to-point a...

In the early deployment of electric toll collecting (ETC) system, multipath interference has caused the malfunction of the system. Therefore, radio absorbers are installed in the toll gate to suppress the scattering. This paper presents a novel radio propagation measurement system to identify the individual scattering object and the power intensity of the ETC gate in real time.

In this paper we propose a co-design methodology, based on a UML and Model Driven Architecture approach, in order to design embedded reconfigurable systems. We particularly focus on the design of software radio and cognitive radio equipments. A potential hardware target is System on Programmable Chip (SoPC), like FPGA components, taking into account the specific capability of partial reconfigur...

Problem Our team chose to design a software defined radio to include on the WSU high altitude balloon. Currently, the balloon is using a hardware-based amateur radio communication system which is not configurable to multiple communication protocols. Any significant modifications to the current system require major hardware upgrades which are costly and time consuming. A software defined radio i...

adiated emission from electronic equipment, co-located to a digital radio receiver, can affect receiving performance. It is therefore of great importance that this undesired emission be considered in the early design phase of a system containing radio equipment. For this purpose, methods to estimate the performance degradation on digital radio receivers in such environment must be available. Fr...

The fundamental limit that is imposed on any wireless system is due to the radio channel. Propagation and channel models are essential for the analysis and simulation of wireless systems. Knowledge of the radio channel is essential to the development and deployment of a wireless system. Radio channel models are used to support research into methods for mitigating channel impairments, such as th...

The radio frequency spectrum is a scarce natural delivers and its efficient use is a of the utmost importance. The spectrum band is a usually licensed to certain services, such as mobile fixed broadcast, and satellite, to avoid harmful interference between different networks. Most spectrum band is a allocated to certain services but worldwide spectrum occupancy measurements show that only porti...