In an earlier discussion, it was argued that LOS technology using SC-PHY is a
more suitable candidate for this kind of application. However, because of the lack
of sufficient numbers of vendors offering PHY-SC solutions at this time, it is difficult
to provide a meaningful economic assessment of that technology. Additionally,
496 Chapter 15
given the conservative bias of the estimate provided here, it is believed that the cost
per customer of PHY-SC-based WiMAX would be no more than what is discussed
here for comparable services due to the amortization of the cost of single Subscriber
Stations (SS) over multiple customers in one building that can be realized using PHYSC
technology. Therefore, for the sake of this economic assessment, we assume that
NLOS technology using OFDM-PHY is used.
Let us assume that Ethernet services are provided from a WiMAX Base Station (BS)
located on the roof of a high-rise building with access to a metro fiber core. Let us also
assume that the service area is divided into three sectors with only one channel per
sector, with each channel using a 20 MHz bandwidth spectrum to deliver 75 Mbps of
shared bandwidth per sector.
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