Conference Paper

Co-channel and adjacent channel interference evaluation for IMT-Advanced coexistence with existing fixed systems

Fac. of Electr. Eng., Univ. Teknol. Malaysia (UTM), Johor Bahru
DOI: 10.1109/RFM.2008.4897356 Conference: RF and Microwave Conference, 2008. RFM 2008. IEEE International
Source: IEEE Xplore

ABSTRACT

Due to spectrum scarcity and emerging various wireless applications, coexistence and sharing between IMT-advanced and fixed wireless access (FWA) systems becomes a recently critical issue. At WRC-07, ITU-R allocated 3400-3600 MHz band for the coming fourth generation (4G) or IMT-Advanced on a co-primary basis along with existing FWA systems. Therefore, coexistence and sharing requirements like separation distance and frequency separation coordination must be achieved in terms of both co-channel and adjacent channel frequencies. Co-sited the two base stations antennas and non co-sited coexistence of the two systems are analyzed (depending on interference to noise ratio of -6 dB as a standard coexistence criteria). The interference analysis models, adjacent channel interference ratio ACIR and spectral emission mask (SEM) are applied in the mentioned band to extract the additional isolation needed to protect adjacent channel interference. Finally, possible intersystem interference mitigation techniques are suggested.

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    • "IMT-A was earlier entitled as " systems beyond IMT-2000 " . It may be approximately developed in the year 2011 with capability to support higher data rates up to 0.1 and 1 Gbps with high mobility and low mobility, respectively, which could be mostly operated in a number of countries around 2015 [1]. 4G (in international telecommunication union-radio (ITU)-terms, IMT-A) technology plan is in general viewed to have two major paths, specifically a conventional cellular-based (2G, 3G and 3G long term evolution (LTE)) and an internet protocol (IP)–based (IEEE 802.16d or worldwide interoperability for microwave access (WiMAX), IEEE 802.16e (mobile WiMAX) and IEEE 802,16m evolution) [2] [3] [4]. "
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    ABSTRACT: Coexistence analysis is exceedingly important in investigating the possibility for spectrum sharing between IMT-A system and existing wireless services. The 470-862 MHz frequency band is currently allocating to several services such fixed wireless access (FWA). International telecommunication union-radio (ITU-R) sector has allocated sub-bands within 470-862 MHz for IMT-A system. This concurrent operation causes a destructive interference that influences the coexisting feasibility between IMT-A and this existing service, FWA. This paper addresses a timely and topical problem dealing with spectrum sharing and coexistence between an IMT-A systems and FWA service within 790-862 MHz. Co-channel and adjacent channel with an overlapping band and with or without guard band are intersystem interference scenarios investigated. The deterministic analysis is carried out by spectral emission mask (SEM) technique. Different significant factors such as channel bandwidths, propagation path lengths, and clutter loss which influence the feasibility of coexistence are examined. Feasible coexistence coordination procedures in terms of separation distance, frequency offset, and guard band are suggested.
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    ABSTRACT: Frequency intersystem interference is a phenomenon caused by coexistence of multiple wireless systems in same or adjacent areas. Consequently, frequency sharing studies play a very important rule in order to use limited spectrum resources efficiently. Because an International Mobile Telecommunication-Advanced (IMT-Advanced) systems are going to use 3500 MHz according to World Radiocommunication Conferences 2007 (WRC-07) decision along with point-to-point Fixed Wireless Access (FWA) system, which currently allocated in the same band, the frequency sharing between IMT-Advanced and FWA is essential. This paper investigates the spectrum sharing requirements in different terrestrial areas using interference to noise ratio criterion. Three methods of investigation of the interference, co-channel, null-guard band, and adjacent channel, have been proposed to investigate the phenomenon in the frequency and space domains to obtain correlation between the minimum separated range of base stations antennas and the frequency separation. Off-axis angles direction alignment is also proposed to reduce the necessary coordination separation distance and frequency separation for good enough coexistence between systems.
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    ABSTRACT: Coexistence of various wireless systems may cause frequency intersystem interference problems. Consequently, frequency sharing studies play a very important task in order to use limited spectrum resources efficiently. Because an International Mobile Telecommunication-Advanced (IMT-Advanced) systems are going to use 3500 MHz according to World Radiocommunication Conferences 2007 (WRC-07) decision along with point-to-point Fixed Wireless Access (FWA) system, which currently allocated in the same band, the frequency sharing between IMT-Advanced and FWA is essential. This paper investigates the spectrum sharing requirements in different terrestrial areas using interference to noise ratio criterion. Three methods of investigation of the interference, co-channel, null-guard band, and adjacent channel, have been proposed to investigate the phenomenon in the frequency and space domains to obtain correlation between the minimum separated range of base stations antennas and the frequency separation. Off-axis angles alignment is also proposed to decrease the required separation distance for acceptable coexistence between systems.
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