Frequency division duplex (FDD) return link transmit diversity systems, methods and devices using forward link side information
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04B-007/06
H04B-007/08
출원번호
US-0720189
(2010-03-09)
등록번호
US-10110288
(2018-10-23)
발명자
/ 주소
Dutta, Santanu
출원인 / 주소
ATC TECHNOLOGIES, LLC
대리인 / 주소
Michael Best & Friedrich LLP
인용정보
피인용 횟수 :
0인용 특허 :
125
초록▼
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 transmi
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.
대표청구항▼
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 frequen
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. 2. The method according to claim 1 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. 3. The method according to claim 2 wherein the averaging period is configured by a wireless network and tra1wmitted to the FDD wireless terminal and/or is configured by the FDD wireless terminal. 4. The method according to claim 1 wherein estimating differential blockages of the forward link at the plurality of spaced-apart antennas of the FDD wireless terminal includes estimating differential blockages that are caused by appendages of a user of the FDD wireless terminal. 5. The method according to claim 1 wherein estimating differential blockages of the forward link at the plurality of spaced-apart antennas of the FDD wireless terminal comprises determining blockage levels at the plurality of spaced-apart antennas of the FDD wireless terminal relative to a threshold blockage level. 6. The method according to claim 5 wherein 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 comprises 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 that has a blockage level that is greater than the threshold blockage level. 7. The method according to claim 5 wherein 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 comprises determining that all of the plurality of spaced-apart antennas of the FDD wireless tem1inal have blockage levels greater than the threshold blockage level and wherein the method farther comprises transmitting over an antenna of the FDD wireless tem1inal having lowest blockage level. 8. The method according to claim 5 wherein 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 comprises determining that only one of the antennas of the FDD wireless terminal has a blockage level less than the threshold blockage level and wherein the method further comprises transmitting over only the one antennal of the FDD wireless terminal. 9. The method according to claim 5 wherein 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 comprises determining that two or more of the antennas of the FDD wireless terminal have blockage levels less than the threshold blockage level and wherein the method further comprises alternately transmitting over the two or more antennas of the FDD wireless terminal. 10. A Frequency Division Duplex (FDD) wireless terminal, comprising: 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; anda 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, 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. 11. The FDD wireless terminal according to claim 10, wherein the averaging period is configured by a wireless network and transmitted to the FDD wireless terminal and/or is configured by the FDD wireless terminal. 12. The FDD wireless terminal according to claim 10, wherein the estimating differential blockages of the forward link at the plurality of spaced-apart antennas of the FDD wireless terminal includes estimating differential blockages that are caused by appendages of a user of the FDD wireless terminal. 13. The FDD wireless terminal according to claim 10 wherein estimating differential blockages of the forward link at the plurality of spaced-apart antennas of the FDD wireless terminal comprises determining blockage levels at the plurality of spaced-apart antennas of the FDD wireless terminal relative to a threshold blockage level. 14. The FDD wireless terminal according to claim 13 wherein the processor 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 by controlling the transmitter of perform operations comprising selectively refraining from trans1ni.tting over the return link from at least one, but less than all, of the plurality of spaced-apart antennas of the FDD wireless terminal that has a blockage level that is greater than the threshold blockage level. 15. The FDD wireless terminal according to claim 13 wherein the processor is configured to control the transmitter to selectively refrain from transmitting over the retun1link from at least one, but less than all, of the plurality of spaced-apart antennas of the FDD wireless terminal by controlling the transmitter of perfom1operations comprising determining that all of the plurality of spaced-apart antennas of the FDD wireless terminal have blockage levels greater than the threshold blockage level and wherein the method further comprises transmitting over an antenna of the FDD wireless terminal having lowest blockage level. 16. The FDD wireless terminal according to claim 13 wherein the processor 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 by controlling the transmitter of perform operations comprising determining that only one of the antennas of the FDD wireless terminal has blockage level less than the threshold blockage level and wherein the method further comprises transmitting over only the one antenna of the FDD wireless terminal. 17. The FDD wireless terminal according to claim 13 wherein selectively the processor 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 by controlling the transmitter of perform operations comprising determining that two or more of the antennas of the FDD wireless terminal have blockage levels less than the threshold blockage level and wherein the method further comprises alternately transmitting over the two or more antennas of the FDD wireless terminal.
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