In cognitive radio adhoc networks the utilization of spectrum without spectrum sensing is a difficult task because of the fluctuations of the availability of spectrum holes. Hence the location awareness is must for concurrent transmission area where both primary users and secondary users can exists. In this paper we examine the data rate control effects on the working of cognitive radio adhoc n...

The past researches shows GMSK (Gaussian minimum shift keying) & OFDM (Orthogonal frequency division multiplexing) are the most effective techniques in the area of wireless communication. There have been many platforms to analyze the working and performance of GMSK & OFDM. In this paper, the experiment is performed on the SDR (software defined radio) which is more flexible radio system as compa...

SCTP (Stream Control Transmission Protocol) provides interesting features, as multihoming and multistreaming, to enhance information transport performances over air interfaces. Additional extensions have been proposed to adapt SCTP to wireless context (mSCTP: mobile SCTP). However, published approaches do not take into account channel state information during handover processes. The present wor...

Currently, most Software Defined Radio (SDR) related products and researches focus on analog communication and voice transmission. In this paper, we propose a SDR platform with digital data communication capability. This platform consists of Field Programmable Gate Array (FPGA) based radio hardware and open source SDR software modules. The main features include: 1) Radio Spectrum Sensing; 2) Re...

The need for optimised utilisation of scarcely available radio resources is prevalent. An efficient use of radio resources could lead to higher spectral efficient transmission on wireless channels. A promising scheme for wireless multimedia transmission at a lower cost is adaptive modulation and coding (AMC). In this paper, a new scheme for AMC is devised. A prioritized adaptive CDMA modulation...

This paper proposes a concept for a new technical field called wireless distributed network (WDN) as a strategic technical field to enable flexible networking and radio resource management (RRM) to cope with dynamic variation of spatially distributed traffic demands. As the core technical subject areas for the WDN, this paper identifies distributed networking for flexible network creation, coop...

This project aims at investigating key issues in radio interface design for practical frequency-selective fading channels. It is focused on the new opportunities and challenges that arise when considering broadband radio systems, with an emphasis on packet data transmission. The purpose of such a radio interface is to carry packets to or from wireless users. The destination of packets may be on...

In order to meet the ever increasing demand for larger transmission bandwidth, Wireless network based on radioover-fiber technologies is a very beneficial solution. This architecture provides flexibility,mobility and high Bandwidth. A digitized RF-over-Fiber transmission scheme based on Bandpass Sampling theory is being introduced. Various Impairments of Analog Radio over Fiber link such as non...

Multi-Radio Multi-Channel (MRMC) systems are key to power control problems in wireless mesh networks (WMNs). In this paper, we present asynchronous multiple-state based power control for MRMC WMNs. First, WMN is represented as a set of disjoint Unified Channel Graphs (UCGs). Second, each network interface card (NIC) or radio assigned to a unique UCG adjusts transmission power using predicted mu...

In cognitive radio network, secondary (unlicensed) users (SUs) are allowed to utilize the licensed spectrum when it is not used by the primary (licensed) users (PUs). Because of the dynamic nature of cognitive radio network, the activities of SUs such as “how long to sense” and “how long to transmit” significantly affect both the service quality of the cognitive radio networks and protection to...