Time delay transmit diversity radiofrequency device
AssigneeAntone Wireless Corporation
InventorsGregory Hey-Shipton, Michael M. Eddy
Life of this patent
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Abstract
A Time-Delay Transmit Diversity (TDTD) RF device is described for use to enhance the transmit performance of wireless communications systems. Time delayed signals are added to diversity antennas to increase coverage and capacity of wireless base stations. Performance is improved by reducing the effects of multipath fading while taking advantage of the additive effects of Rake receivers used in mobiles.
Claims27
A radiofrequency device adapted for coupling between a base station and antenna comprising:
- an enclosure having inputs operatively coupled to a base station to receive a transmit signal, and outputs operatively coupled to antennas;
- and
- a transmission path disposed within the enclosure including an amplifier, whereby a replica of the transmit signal is produced and delayed relative to the transit signal, and transmitted onto a separate transmit path in addition to the transmit signal from the base station.
A radiofrequency device adapted for coupling between a base station and antennas comprising:
- an enclosure having an input operatively coupled to a base station and outputs operatively coupled to antennas;
- and
- a transmission path disposed within the enclosure including an amplifier, whereby said enclosure accepts a transmit signal and produces a replica transmit signal from the base station that is delayed relative to the transmit signal, and transmitted onto a second transmit path in addition to the transmit signal on a first transmit path, wherein the delay of the replica transmit signal is greater than the chip length of the signal being transmitted.
A radiofrequency device adapted for coupling between base stations and antennas comprising:
- an enclosure having input connections operatively coupled to one or more base stations to receive transmit signals, and outputs operatively coupled to antennas;
- and
- transmission paths disposed within the enclosure including amplifiers, wherein replicas of the transmit signals from the base stations are produced, delayed relative to the transmit signals, and connected to a different transmit path in addition to an original transmit path from the base station.
Dependencies are inferred from the claim text.