Telecommunications – Carrier wave repeater or relay system – With transmission line
Patent
1997-05-28
1999-07-27
Eisenzopf, Reinhard J.
Telecommunications
Carrier wave repeater or relay system
With transmission line
455 22, 455209, 455318, H04B 336
Patent
active
059306823
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.
REFERENCES:
patent: 3922674 (1975-11-01), Gingras, Jr. et al.
patent: 4476574 (1984-10-01), Struven
patent: 4776039 (1988-10-01), Akaiwa
patent: 5404570 (1995-04-01), Charas et al.
patent: 5428836 (1995-06-01), Sanecki et al.
patent: 5603080 (1997-02-01), Kallander et al.
Cutrer David M.
Georges John B.
Schwartz Adam L.
Yeung Simon P.
Bhattacharya Sam
Eisenzopf Reinhard J.
LGC Wireless Inc.
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