Time division adaptive retransmission technique for portable radio telephones
First Claim
1. A portable transceiver comprising:
- a controller capable or providing control signals during predetermined time periods of a time division sequence;
a transmitter capable of transmitting a digital preamble signal during a first and a second time slot of the time division sequence and a digital message signal during a third time slot of said time division sequence in response to control signals from the controller;
a receiver capable of receiving from a remote location a digital preamble signal during a fourth and a fifth time slot of said time division sequence and a digital message signal during a sixth time slot of said time division sequence and determining from said received preamble signals during the fourth and fifth time slots which includes the stronger signal;
a first and second spaced-apart antenna oriented substantially orthogonal to each other; and
means responsive to control signals from the controller for switching the transmitter to the first and second antenna during said first and second time slots, respectively, and to the antenna determined by the receiver to have received the stronger preamble signal during the fourth and fifth time slot of an immediately prior time division sequence during the third time slot and for switching the receiver to the first and second antenna during the fourth and fifth time slot, respectively, and to the antenna providing the stronger signal in the fourth and fifth time slot during the sixth time slot of said time division sequence.
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Accused Products
Abstract
The present invention relates to a portable transceiver and a remote terminal station each using at least two antennas with different polarization transmission capabilities for an adaptive retransmission technique. In the present adaptive retransmission technique, the terminal station transmits the same preamble signal in at least two time slots of a frame period of a time division sequence using the antenna receiving the strongest signal from the transceiver in the immediately prior frame period followed by a binary message signal using the same antenna. The transceiver receives each of the preamble transmissions from the terminal station via a separate one of differently oriented antennas and determines which antenna received the strongest signal. The message signal from the terminal station is then received via the antenna of the transceiver having received the strongest signal and also sends its response message signal on that antenna during a separate time slot of a frame period.
206 Citations
17 Claims
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1. A portable transceiver comprising:
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a controller capable or providing control signals during predetermined time periods of a time division sequence; a transmitter capable of transmitting a digital preamble signal during a first and a second time slot of the time division sequence and a digital message signal during a third time slot of said time division sequence in response to control signals from the controller; a receiver capable of receiving from a remote location a digital preamble signal during a fourth and a fifth time slot of said time division sequence and a digital message signal during a sixth time slot of said time division sequence and determining from said received preamble signals during the fourth and fifth time slots which includes the stronger signal; a first and second spaced-apart antenna oriented substantially orthogonal to each other; and means responsive to control signals from the controller for switching the transmitter to the first and second antenna during said first and second time slots, respectively, and to the antenna determined by the receiver to have received the stronger preamble signal during the fourth and fifth time slot of an immediately prior time division sequence during the third time slot and for switching the receiver to the first and second antenna during the fourth and fifth time slot, respectively, and to the antenna providing the stronger signal in the fourth and fifth time slot during the sixth time slot of said time division sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A portable communication system comprising:
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a terminal station comprising a controller capable of providing control signals during predetermined time periods of a time division sequence; a transmitter capable of transmitting (1) a digital preamble signal during a first and a second time slot of a frame period of the time division sequence and (2) a digital message signal during a third time slot of said frame period in response to control signals from the controller; a first and a second antenna capable of transmitting or receiving a first and a second orthogonally polarized signal, respectively; a receiving section comprising a first and a second receiver capable of being coupled to the first and second antenna, respectively, and receiving from a remote portable transceiver a same first and second orthogonally transmitted digital preamble signal during a fourth and fifth time slot, respectively, of a frame period of the time division sequence; and
means for determining from the received preamble signals which antenna received the strongest signal and for transmitting control signals corresponding to such determination to the controller; andmeans responsive to control signals from the controller for switching the transmitter, during the first to third time slots, to the first or second antenna determined by the receiver section determining means to have received the strongest signal during the fourth and fifth time slots of an immediately prior frame, and for connecting the first and second receivers to the first and second antennas, respectively, during the fourth and fifth time slots of a frame period and maintaining the antennas-to-receivers connections during a sixth time slot of the frame period for reception of a message signal from the remote transceiver by the receiver having been determined by the determining means of the receiver section to have received the strongest signal during the fourth and fifth time slots of the immediately previous frame period. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of adaptive retransmission comprising the steps of:
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in a portable transceiver (a) receiving from a remote terminal station a first sequence of binary information, which was transmitted by the terminal station in a first or second orthogonally polarized signal, via a first antenna section of the portable transceiver and determining therefrom the signal strength of the received signal during a first time slot of a frame of a time division sequence; (b) receiving from the terminal station a second sequence of binary information, which was transmitted by the terminal station in a second signal polarized the same as said first polarized signal, via a second antenna section of the portable transceiver which is oriented substantially orthogonal and in the same plane as said first antenna section and determining therefrom the signal strength of the received second signal during a second time slot of the frame of the time division sequence; (c) transmitting from the portable transceiver via the first antenna section a third sequence of binary information to the remote terminal station in a third time slot of a frame of the time division sequence; (d) transmitting from the portable transceiver via the second antenna section a forth sequence of binary information to the remote terminal station in a fourth time slot of a frame of the time division sequence; (e) determining from steps (a) and (b) which of the first and second antenna section of the transceiver provided a received signal from the terminal station with a greater signal strength; (f) reiterating steps (a) to (e) in each subsequent time division sequence; (g) concurrent with step (f), transmitting from the transceiver during a fifth time slot of the time division sequence immediately after step (d), a fifth sequence of binary information comprising message bits via the antenna section determined in step (e) to have provided the greater signal strength; and (h) concurrent with step (f), receiving from the terminal station during a sixth time slot immediately following the second time slot of a frame, a sixth sequence of binary information comprising message bits via the antenna section determined in step (e) to have provided the greater signal strength. - View Dependent Claims (16, 17)
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Specification