Device and method for configurable transmit and receive antennas
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United States of America Patent
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Feb 18, 2014
Grant Date -
N/A
app pub date -
Oct 28, 2011
filing date -
Oct 29, 2010
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A configurable antenna arrangement is disclosed for wireless Positive Train Control system to overcome the deep fading and fast fading issue. The radio channel between a locomotive on-board radio unit and a base station is subject to fast and deep fading. The channel changes rapidly in a short time comparing to the length of the packet. The invention uses a TX antenna and a RX antenna in a time division multiple access (TDMA) radio system associated with control circuits to provide a configurable antenna sub-system. The antenna sub-system is configurable to provide a TX mode, a primary RX mode and a secondary RX mode. In both the TX mode and the primary RX mode, there is substantially no insertion loss. In the secondary RX mode, the TX antenna is used as the secondary RX antenna to overcome fading caused by Doppler shift.
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