Fiber-optic microcell radio systems with a spectrum delivery scheme

Ohmoto, R.; Ohtsuka, Hiroyuki; Ichikawa, Hisashi

doi:10.1109/49.233223

Cited by 46 publications

(18 citation statements)

References 23 publications

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“…, the cumulative distribution function of , , is obtained by (7) Finally, the mean channel holding time can be expressed as (8) Fig. 6 shows good agreements in expected channel holding times between approximation results from (3) and simulation results.…”

Section: A Channel Holding Timementioning

confidence: 72%

A movable safety zone scheme in urban fiber-optic microcellular systems

Cho

Kang

Sung

1999

IEEE Trans. Veh. Technol.

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We consider an urban fiber-optic microcellular system in which a cigar-shaped cell consists of several microzones with their own antenna sites connected to a central station through optical fibers. To increase the efficiency of radio resources and reduce unnecessary handoffs between microzones, we propose a movable safety zone scheme. A safety zone is a virtually guarded area that does not permit cochannel interference. Outside the safety zone, cochannels can be reused. The safety zone can move under the condition that its user does not meet cochannel interference as he moves to an adjacent microzone. Considering user mobility characteristics in the cigarshaped cell, we analyze and evaluate the proposed system in terms of intracell and intercell handoff rates, blocking probability, intracell call-dropping probability, and channel reuse parameter. The proposed system can handle a traffic capacity of about 12 Erlangs for seven traffic channels under a call blocking probability of 1% and generates a negligible number of intracell handoffs compared with those of intercell handoffs.Index Terms-Cigar-shaped cell, fiber-optic, intracell handoff, microzone, movable safety zone, urban microcell. Publisher Item Identifier S 0018-9545(99)05786-2. Ho-Shin Cho (S'92-M'99) received the B.S., M.S., and Ph.D. degrees in electrical engineering from the Korea Advanced Institute where he has conducted studies on performance analysis and test of base stations for IMT-2000. His research interests include mobility modeling, resource management, traffic analysis, and intelligent antenna scheme in wireless communication systems.

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Section: A Channel Holding Timementioning

confidence: 72%

A movable safety zone scheme in urban fiber-optic microcellular systems

Cho

Kang

Sung

1999

IEEE Trans. Veh. Technol.

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“…A large number of antenna ports are implemented at low cost by installation of all channel elements in a central station (CS). Messages between antenna ports and CS are transmitted by subcarrier multiplexing (SCM) [15] and traffic channels are dynamically assigned according to traffic demand in each microzone by spectrum delivery switching (SDS) [16].…”

Section: Introductionmentioning

confidence: 99%

High reuse efficiency of radio resources in urban microcellular systems

Cho

Kwon²,

Sung³

2000

IEEE Trans. Veh. Technol.

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A new microcell configuration scheme in urban areas is proposed in order to increase the reuse efficiency of radio resources. Multiple directional-beam antennas lined up along a street form a cigar-shaped cell. Antennas are located at intersection and are directed along the intersecting streets. Two antennas facing each other form a microzone and, therefore, a cigar-shaped cell consists of multiple microzones in a line. Each microzone is protected against cochannel interference from neighboring microzones by confinement of transmitted signals to a microzone using down-tilting of antenna beams. Therefore, a radio channel which is occupied in one microzone can be used in adjacent microzones. An increase in system capacity is achieved by the high reuse efficiency of radio resources. The proposed system increases system capacity up to 560% with a call blocking probability of 1% when compared with a conventional system. In addition, a macrodiversity scheme using two antennas in a microzone improves call quality on reverse link.

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“…However, large-scale fading known as shadowing overwhelms a system with such closely spaced antennas. Emerging distributed and sectorized distributed antennas (SDA) [1] - [3] and the radioon-fiber (RoF) technologies [4], [5] are providing novel ways of handling signals received at widely separated antennas. These technologies are particularly suitable for microcellular systems and they could facilitate linking of distributed antennas or access ports to a central unit where signal-specific processing could then be performed.…”

mentioning

confidence: 99%

Hybrid macro/microdiversity techniques in the reverse-link wireless communication networks

Adinoyi

Yanıkömeroğlu

2006

IEEE Trans. Wireless Commun.

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Abstract-We investigate microdiversity-augmented macrodiversity techniques in wireless communication networks. The setup consists of K widely separated access ports each carrying N antennas. The conventional selection macrodiversity (Scheme I) and two proposed methods (Scheme II and Scheme III) for port selection are investigated and their performance are compared. Scheme II utilizes the advancement in distributed antennas and radio-on-fiber technologies whereas Scheme III utilizes these technologies in a way similar to the soft handover of CDMA systems. After the port selection, the microdiversity uses n strongest signals (n ≤ N ) of the selected port for diversity combining if practical constraints preclude the use of all N signals.Analytical performance expressions for the probability of error and outage probability for Scheme I are developed. Simulations are used to investigate Scheme II and Scheme III and it is observed that these latter schemes exhibit performance superiority over the conventional macrodiversity selection method. The power savings obtained using the proposed architecture and new selection schemes could be used either for coverage extension or to increase capacity in wireless networks.

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Fiber-optic microcell radio systems with a spectrum delivery scheme

Cited by 46 publications

References 23 publications

A movable safety zone scheme in urban fiber-optic microcellular systems

A movable safety zone scheme in urban fiber-optic microcellular systems

High reuse efficiency of radio resources in urban microcellular systems

Hybrid macro/microdiversity techniques in the reverse-link wireless communication networks

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