Frequency division duplex (FDD) return link transmit diversity systems, methods and devices using forward link side information
First Claim
1. A transmit diversity method for a Frequency Division Duplex (FDD) wireless terminal, the FDD wireless terminal comprising a plurality of spaced-apart antennas that are configured to transmit over a return link and to receive over a forward link that is spaced apart from the return link in frequency, the transmit diversity method comprising:
- selectively refraining from transmitting over the return link from at least one, but less than all, of the plurality of spaced-apart antennas of the FDD wireless terminal in response to channel estimating of the forward link that is received at the plurality of spaced-apart antennas of the FDD wireless terminal,wherein the channel estimating of the forward link that is received at the plurality of spaced-apart antennas of the FDD wireless terminal comprises estimating differential blockages of the forward link at the plurality of spaced-apart antennas of the FDD wireless terminal, andwherein estimating differential blockages of the forward link at the plurality of spaced-apart antennas of the FDD wireless terminal comprises estimating differential gains of the plurality of spaced-apart antennas of the FDD wireless terminal, averaged over angles of arrival of the forward link.
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Accused Products
Abstract
A Frequency Division Duplex (FDD) wireless terminal includes spaced-apart antennas that are configured to transmit over a return link and to receive over a forward link that is spaced apart from the return link in frequency. The FDD wireless terminal is configured to selectively refrain from transmitting over the return link from at least one of the spaced-apart antennas of the FDD wireless terminal in response to differentials in forward link power that is received at the spaced-apart antennas of the FDD wireless terminal, that are caused, for example, by blocking appendages of a user of the wireless terminal. Related methods are also described.
226 Citations
17 Claims
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1. A transmit diversity method for a Frequency Division Duplex (FDD) wireless terminal, the FDD wireless terminal comprising a plurality of spaced-apart antennas that are configured to transmit over a return link and to receive over a forward link that is spaced apart from the return link in frequency, the transmit diversity method comprising:
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selectively refraining from transmitting over the return link from at least one, but less than all, of the plurality of spaced-apart antennas of the FDD wireless terminal in response to channel estimating of the forward link that is received at the plurality of spaced-apart antennas of the FDD wireless terminal, wherein the channel estimating of the forward link that is received at the plurality of spaced-apart antennas of the FDD wireless terminal comprises estimating differential blockages of the forward link at the plurality of spaced-apart antennas of the FDD wireless terminal, and wherein estimating differential blockages of the forward link at the plurality of spaced-apart antennas of the FDD wireless terminal comprises estimating differential gains of the plurality of spaced-apart antennas of the FDD wireless terminal, averaged over angles of arrival of the forward link. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A Frequency Division Duplex (FDD) wireless terminal, comprising:
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a plurality of spaced-apart antennas; a transmitter that is configured to transmit over a return link from the plurality of spaced-apart antennas of the FDD wireless terminal; a receiver that is configured to receive over a forward link that is spaced apart from the return link in frequency, from the plurality of spaced-apart ante=s of the FDD wireless terminal; and a processor that is configured to control the transmitter to selectively refrain from transmitting over the return link from at least one, but less than all, of the plurality of spaced-apart antennas of the FDD wireless terminal in response to channel estimating of the forward link that is received at the plurality of spaced-apart antennas of the FDD wireless terminal, wherein the channel estimating of the forward link that is received at the plurality of spaced-apart antennas of the FDD wireless terminal comprises measuring forward link power at the plurality of spaced-apart antennas of the FDD wireless terminal over an averaging period, wherein the channel estimating of the forward link that is received at the plurality of spaced-apart antennas of the FDD wireless terminal comprises estimating differential blockages of the forward link at the plurality of spaced-apart antennas of the FDD wireless terminal, and wherein estimating differential blockages of the forward link at the plurality of spaced-apart antennas of the FDD wireless terminal comprises estimating differential gains of the plurality of spaced-apart antennas of the FDD wireless terminal, averaged over angles of arrival of the forward link. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification