Centralized channel selection in a distributed RF antenna system
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United States of America Patent
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Jul 27, 1999
Issued Date -
N/A
app pub date -
May 28, 1997
filing date -
Apr 19, 1996
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Individual channels are centrally and tunably selected for emission in a distributed wireless communications system. A high-frequency signal received at a central antenna is down-converted such that a selected channel corresponds to a predetermined frequency range. Non-selected channels are filtered out. The selected channel is transmitted to remote locations over commonly available transmission lines, up-converted, and re-emitted. The transmitted channel is chosen by tuning the frequency of the local oscillator used for down-conversion. A high-stability global tuning signal is used to tune and stabilize the local oscillators used for up-conversion. The global tuning signal is generated by frequency-dividing the down-conversion local oscillator signal by a fixed number, while the up-conversion local oscillator signals are generated by frequency-multiplying the global tuning signal by the same fixed number. Phase-locked loops are used for frequency multiplication and stabilization. Applications include cellular communications, cordless telephony, local RF communications, interactive multimedia video, and high bit-rate local communications.
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