Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1976-02-12
1977-05-24
Griffin, Robert L.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
325 64, 325466, 325478, 343177, H04B 360, H04B 1500
Patent
active
040258530
ABSTRACT:
In a radio communication system of the cellular type wherein sets of communication channels are reused in different adjacent sets of cell areas within a common mobile communication service area, each cell base station utilizing a given set of channels in common with other base stations is assigned a different supervisory tone to be modulated on all of its channels. Any mobile unit receiving such channel transponds the modulated supervisory tone and sends it back to the base station. At each base station the transmitted and received supervisory tones for any given channel are compared to produce an indication of whether or not the sending mobile unit is actually communicating on the transmitted channel of the same base station. At each mobile unit, reference tones are generated which are spectrally located between adjacent ones of the possible supervisory tones for the mobile communication area, and the spectral position of a received tone with respect to the reference tones is determined. Signals representing that determination are translated into a digital character corresponding to the name of the received tone, and that name is compared with the name of the tone for the mobile unit's assigned channel. A name mismatch is utilized to quiet the mobile unit receiver for the duration of the mismatch. In addition, if that duration exceeds a predetermined interval, the mobile unit controller is actuated to initiate the dropping of communication on the assigned channel.
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patent: 2904674 (1959-09-01), Crawford
patent: 2987586 (1961-06-01), Berger
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patent: 3895191 (1975-07-01), Koganezawa et al.
patent: 3909727 (1975-09-01), Hughes et al.
High Capacity Mobile Telephone System Technical Report (Filed in F.C.C. Docket 18262) Dec. 1971 - Prepared by Bell Laboratories, pp. 3-11 - 3-13, 3-22 - 3-28.
Bell Telephone Laboratories Incorporated
Bookbinder Marc E.
Griffin Robert L.
Phelan Charles Scott
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