专利名称：Multichannel radio frequency transmission
system to deliver wideband digital data intoindependent sectorized service areas
发明人：G. William Stockton,William D. Oatman,Brent
S. Simons,James H. Schoenduve
申请号：US09003891申请日：19980107公开号：US06243427B1公开日：20010605
专利附图：
摘要：A one-way and two-way multichannel radio frequency transmission system and
method employing a sectorized broadcasting technique is described. The system andmethod reduces the effective bandwidth of the broadcast signal by multiplexing availablechannels of signals into a set of formatted independent digital bitstreams—where eachof the bitstreams includes all or a portion of the available channels provided by thesystem program provider. The independent bitstreams are transmitted to transmittingtowers using point-to-point transmission methods. The transmitting towers phasemodulate and amplify the bitstreams to generate a set of independent modulatedsignals. Each transmitter tower includes an antenna for broadcasting the modulatedsignals to a sectorized service area each sector in the service area receiving a differentone of the set of independent modulated signals. The antenna includes a set of individualantenna panels each panel for broadcasting one of the set of modulated signals. Eachsubscriber site demodulates, demultiplexes and selects one channel from the receivedmodulated signal. Each transmitting tower broadcasts all of the independent modulatedsignals at one of a set of operating frequencies such that adjacent transmitting towersbroadcast at different operating frequencies. In addition, adjacent antenna panels of agiven antenna transmit at opposite transmission polarity.
申请人：WYTEC, INCORPORATED
代理机构：Burns Doane Swecker & Mathis LLP
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