| 摘要 |
A broadcast system (10) operates with a plurality of transmit sites (14, 16, 18, 20), each provides a line-of-sight transmission pattern (30, 32, 34, 36) to a single service area (12). A plurality of receive sites (42, 44, 46, 48) are located in the service area (12) and each is provided with a narrow beamwidth directional receive antenna (42A, 44A, 46A, 48A) which is focused toward only one of the transmit sites (14, 16, 18, 20). The transmit sites are positioned sufficiently distant from each other such than only one transmit site is within the main lobe beam pattern (62, 64, 66) of a receive antenna within the service area (12). The transmit sites provide a plurality of multiuse microwave signals (A, B) on a common band to a single service area so that there is reuse of the available spectrum. The reuse of the spectrum can be applied to each of a plurality of band that are available in a given service area.
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