Apparatus and method for echo cancellation in a wireless repeater using cross-polarized antenna elements
First Claim
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1. For use in a wireless network, a repeater capable of re-transmitting a downlink signal transmitted from a base station to a mobile station in a forward channel, said repeater comprising:
- a first antenna for receiving an incoming downlink signal from said base station;
a second antenna for transmitting an outgoing downlink signal to said mobile station, wherein said second antenna is cross-polarized with respect to said first antenna; and
a third antenna for receiving from said second antenna a downlink echo signal derived from said outgoing downlink signal, wherein said third antenna is co-polarized with respect to said second antenna and cross-polarized with respect to said first antenna.
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Abstract
A repeater for re-transmitting uplink and downlink signals in a wireless network. The repeater uses antenna cross-polarization, signal cancellation and digital processing techniques to reduce or eliminate coupling of echo signals between the receive and transmit antennas of the downlink and uplink signal paths in the repeater.
98 Citations
20 Claims
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1. For use in a wireless network, a repeater capable of re-transmitting a downlink signal transmitted from a base station to a mobile station in a forward channel, said repeater comprising:
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a first antenna for receiving an incoming downlink signal from said base station;
a second antenna for transmitting an outgoing downlink signal to said mobile station, wherein said second antenna is cross-polarized with respect to said first antenna; and
a third antenna for receiving from said second antenna a downlink echo signal derived from said outgoing downlink signal, wherein said third antenna is co-polarized with respect to said second antenna and cross-polarized with respect to said first antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A wireless network comprising:
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a plurality of base stations capable of communicating with a plurality of mobile stations in a coverage area of said wireless network; and
a repeater capable of re-transmitting a downlink signal transmitted from a first one of said plurality of base stations to a first one of said plurality of mobile station in a forward channel, said repeater comprising;
a first antenna for receiving an incoming downlink signal from said first base station;
a second antenna for transmitting an outgoing downlink signal to said first mobile station, wherein said second antenna is cross-polarized with respect to said first antenna; and
a third antenna for receiving from said second antenna a downlink echo signal derived from said outgoing downlink signal, wherein said third antenna is co-polarized with respect to said second antenna and cross-polarized with respect to said first antenna;
- View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification