Abstract
In this paper, we utilize the embedded hybrid fiber-optic/ coaxial CATV network for wireless bidirectional communications with a star-ring-fiber-optic network to distribute broadcasting cable TV programs and simultaneously to provide bidirectional transmission of wireless signals. At the head end, there are two lasers: the downlink laser is splitted into two parts (one as the local oscillator for the uplink coherent detection and the other being externally modulated by the combined TV and wireless signals); the uplink laser connects to the ring network with the cascade phase modulators schemes. For single star-ring topology, total hub number are 7, 9, 10 for the radius between head end and hub of 5 km, 2 km and range from 0.5 km to 1 km, respectively, with the CNR U and CNR D larger than 15 dB together with CNR TV larger than 50 dB. In consideration of the location neighbourhood and frequency reuse, we may apply the multi-star-ring CATV cellular network with the distance between the head end and the first level hub of 5 km and the distance between the first level hub and the second level hub of 0.5 km. The total hubs number of 42 for the multi-star-ring system as shown in Fig. 7 can support 1680 wireless users with frequency reuse number of 7 for covering the circle area of radius 5 km.
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