Spectrum Sharing Studies of Imt-Advanced and Fwa Services Under Different Clutter Loss and Channel Bandwidths Effects

Abstract

Abstract-Spectrum sharing between wireless systems becomes a critical issue due to emerging new technologies and spectrum shortage. Recently, IMT-Advanced system has been allocated in the same frequency band (3500 MHz) along with fixed services on co-primary basis, which means that harmful interference probability may be transpired. Channel bandwidths (BW) and natural of deployment areas of wireless systems are of the main effective factors in spectrum sharing. Spectrum Emission Mask (SEM) model will be used to study these factors effects beside the interference to noise ratio (I/N ) as a fundamental criterion for coexistence and sharing between systems. The frequency and distance separation and antenna height effects are essential to be investigated to achieve spectrum sharing.

Point-Point Fixed Wireless and Broadcasting Services Coexistence With Imt-Advanced System

“…1 illustrates the ability of this method to address various intersystem interference scenarios, in which y-axis represents interference to noise (I/N ) ratio, while x-axis shows how far the victim system is away from the center carrier frequency of the interferer. In order to study the feasibility of coexistence by adjacent channel with a certain guard band, the signal I/N value must be at least equal to the interference protection criteria (IPC ) value which is equivalent to −6 dB for both mobile and fixed systems at different frequency bands according to [3,11,13]; i.e., the signal, I/N , must at least touch or cross the IPC line at a point to the right side of the ZGB edge. We call this cross point a right cross point (RCP ).…”

“…While if the interference is greater than that value and the carrier to interference (C/I) ratio is not enough, then the situation will be worse. The interference level I [3] is given by (7): (7) where P t represents the transmitted power of the interferer in dBm, G t and G r denote the interference transmitter and victim receiver antenna gains in dBi, S is the attenuation due to spectrum emission mask for every carrier frequency offset, ∆f , between the victim and interferer. The spectrum emission attenuation can be obtained by employing linear formulas as explained in Eq.…”

“…These requirements for IMT-Advanced system or the fourth generation (4G) of cellular wireless standards are defined by international telecommunication union-radio (ITU-R). Currently, IMT-Advanced technology plan is generally viewed to have two main roads, specifically a conventional cellular-based (2G, 3G, 3G long term evolution (LTE), and LTEAdvanced) from the 3rd generation partnership project (3GPP), and an internet protocol (IP)-based (IEEE 802.16d or worldwide interoperability for microwave access (WiMAX) [2,3], IEEE 802.16e (mobile WiMAX) and IEEE 802.16m evolution) from the institute of electrical and electronics engineers (IEEE) [1,4,5]. Another point that is reasonably priced takes into account that high bandwidth (BW) mobile access leads to a better quality of experience for users, facilitating them to get more out of existing services, and opens the door for latest broadband systems.…”

“…The accessible frequency spectrum is not enough for the actual demand for transmission resources, and manage spectrum is still a revolutionary need by regulators [6]. In terms of spectrum coexistence, several frequency bands [3,7], including 790-862 MHz, have been allocated for use by IMT systems, which include both IMT-2000 and IMTAdvanced systems. 790-862 MHz is certainly in the 'sweet spot' of frequencies, which are high wave length enough to offer fulfilled coverage with comparatively less number of transceivers.…”

Co-Frequency Interference Suppression Algorithm via Maximum Signal Minus Interference Level

“…In order to maximize the efficient use of RF spectrum, the International Telecommunications Union (ITU) authorizes to share spectrum [1], so the Federal Communications Commission (FCC) and the National Telecommunications and Information Administration (NTIA) share spectrum managements with each other, and the spectrum sharing technologies are studied widely in [2,3].…”