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EP0124319A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Radio telephones

Assignee: AT&T Inc
•
Filing: 1984-04-17
•
Granted: —
•
Expires: 2004-04-17
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Abstract

Abstract A radiotelephone system using portable radiotelephones (FIG. 2) utilizes two antennas but only one receiver section. A terminal station (FIG. 1) transmits the same preamble signal in at least two time slots of a frame period of a time division sequence using the antenna (20 or 21) receiving the strongest preamble signal from the portable station in the immediately prior frame period followed by a binary message signal using the same antenna. The portable station receives each of the preamble transmissions from the terminal station via both of differently oriented antennas (50, 51) and determines which antenna received the strongest signal. The message signal from the terminal station is then received via the antenna of the portable station having received the strongest signal, the portable station also sends its response message signal on that antenna during a separate time slot of a frame period.

Inventors

  • 👤 Donald Clyde Cox

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-06 19:30
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/10; H04B7/04; H04B7/06; H04B7/0602; H04B7/0608; H04B7/061; H04B7/08; H04B7/0802; H04B7/0805; H04B7/0808; H04B7/0811; H04B7/24; H04B7/26; H04B7/2643

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 78 words
A radiotelephone comprising first and second antennas and transmitter and receiving sections for selective connection to said antennas, characterized by means for successively (52, 53) receiving (55) and comparing (57) the amplitude of remotely transmitted preamble signals received on each of said antennas (50 51), and means for subsequently, during different time intervals, transmitting (40) and receiving (41) a message signal via (52, 53) the one of said antennas earlier determined to have received the stronger preamble signal.
Claim 2
Dependent Claim 78 words
A radiotelephone comprising first and second antennas and transmitter and receiving sections for selective connection to said antennas, characterized by means for successively (52, 53) receiving (55) and comparing (57) the amplitude of remotely transmitted preamble signals received on each of said antennas (50 51), and means for subsequently, during different time intervals, transmitting (40) and receiving (41) a message signal via (52, 53) the one of said antennas earlier determined to have received the stronger preamble signal.
Claim 3
Dependent Claim 24 words
A radiotelephone according to claim 1 including means (43) for transmitting successive preamble signals on first one and then the other of said antennas.
Claim 4
Dependent Claim 18 words
A radiotelephone according to claim 1 including means (13) for transmitting successive preamble signals on said one antenna.
Claim 5
Dependent Claim 16 words
A radiotelephone according to claim 3 wherein said antennas are orthogonally polarized relative to each other.

References Cited (Backward Citations)

GB368954A Cited
US3835392A Cited
DE2534888A1 Cited

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