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11.发明专利
公开(公告)号：AU2009279485A1
公开(公告)日：2010-02-11
申请号：AU2009279485
申请日：2009-08-07
Applicant: QUALCOMM INC
Inventor： HOU JILEI , SMEE JOHN E , MALLADI DURGA PRASAD , GHADY NAVID HASSANPOUR , MALLIK SIDDHARTHA
Abstract: Techniques for supporting distributed multiple-input multiple-output (MIMO) transmissions are described. In one design, a user equipment (UE) determines channel estimates for multiple cells and reports the channel estimates. The UE thereafter receives a data transmission sent by the multiple cells to the UE based on the channel estimates. The data transmission may include at least one data stream, and each data stream may be sent by one cell or the multiple cells to the UE. In another design, a UE determines first and second channel estimates for first and second cells, respectively, and reports the channel estimates. The UE then receives a first data transmission sent by the first cell to the UE based on the first channel estimate. The UE also receives a second data transmission sent by the second cell to another UE and steered away from the UE based on the second channel estimate.
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公开(公告)号：AU2004204911C1
公开(公告)日：2009-12-03
申请号：AU2004204911
申请日：2004-01-07
Applicant: QUALCOMM INC
Inventor： WALTON JAY RODNEY , SMEE JOHN E , MALLADI DURGA PRASAD
Abstract: Pilot transmission schemes suitable for use in wireless multi-carrier (e.g., OFDM) communication systems. These pilot transmission schemes may utilize frequency, time, or both frequency and time orthogonality to achieve orthogonality among the pilots transmitted by multiple base stations on the downlink. Frequency orthogonality is achieved by transmitting pilots on disjoint sets of subbands. Time orthogonality is achieved by transmitting pilots using different orthogonal codes (e.g., Walsh codes). The pilots may also be scrambled with different scrambling codes, which are used to randomize pilot interference and to enable identification of the transmitters of these pilots. Pilot interference cancellation may be performed to improve performance since subbands used for data transmission by one transmitter may also be used for pilot transmission by another transmitter. Pilot interference is estimated and then subtracted from received symbols to obtain pilot-canceled symbols having improved quality.
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公开(公告)号：AT441981T
公开(公告)日：2009-09-15
申请号：AT02768894
申请日：2002-09-24
Applicant: QUALCOMM INC
Inventor： SMEE JOHN E , FERNANDEZ-CORBATON IVAN JESUS , JAYARAMAN SRIKANT
Abstract: Systems and methods according to the present invention are described for adjusting the number of taps in an adaptive equalizer over time as the rate of change of a communications channel varies. The number of taps or "equalizer length" is adjusted based on an estimate of the Doppler frequency between the devices communicating over a channel. The Doppler frequency is reflective of the rate of change of the communications channel. Greater Doppler frequencies indicate a more quickly varying channel, and vice versa. It is therefore desirable to change the equalizer length (by adding or dropping taps) based on a measurement of the Doppler frequency. Equalizer length is increased as the Doppler frequency decreases. Conversely, equalizer length is decreased as the Doppler frequency increases. This enables the equalizer to achieve a better compromise between the competing goals of adaptation speed (less taps) and ISI reduction (more taps).
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公开(公告)号：BRPI0512822A
公开(公告)日：2008-04-08
申请号：BRPI0512822
申请日：2005-06-30
Applicant: QUALCOMM INC
Inventor： CORALLI ALESSANDRO VANELLI , PFISTER HENRY DAVID , HOU JILEI , SMEE JOHN E , PADOVANI ROBERTO , BUTLER BRIAN K , LEVIN JEFFREY A , WILBORN THOMAS B , BENDER PAUL E
IPC: H04B1/707
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公开(公告)号：NO20073179A
公开(公告)日：2007-09-21
申请号：NO20073179
申请日：2007-06-21
Applicant: QUALCOMM INC
Inventor： SMEE JOHN E , HOU JILEI , PFISTER HENRY DAVID , TOMASIN STEFANO
CPC classification number: H04B1/7103 , H04B2201/70701
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Patent Agency Ranking
公开(公告)号：BRPI0407686A
公开(公告)日：2006-03-01
申请号：BRPI0407686
申请日：2004-02-23
Applicant: QUALCOMM INC
Inventor： JAYARAMAN SRIKANT , SMEE JOHN E , FERNANDEZ-CORBATON IVAN JESUS
Abstract: Techniques for performing equalization of multiple signals received by a terminal in soft handoff with multiple base stations. The received signal at the terminal is conditioned and digitized to provide a stream of received samples (y m ), which is then equalized/filtered (410) with multiple sets of coefficients to provide multiple streams of transmit chip estimates (X k ). One set of coefficients (f k ) is provided for each base station and is used to provide a corresponding stream of transmit chip estimates. The multiple streams of transmit chip estimates are further processed (420) to provide multiple streams of data symbol estimates (d k ), one stream of data symbol estimates for each base station. The multiple streams of data symbol estimates are then scaled (430) with multiple scaling factors (± k ) and combined (432) to provide a stream of combined data symbol estimates (d k ). The processing for the multiple base stations may be performed by a single hardware unit in a time division multiplexed manner.
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17.发明专利
公开(公告)号：CA2572090A1
公开(公告)日：2006-01-12
申请号：CA2572090
申请日：2005-06-30
Applicant: QUALCOMM INC
Inventor： LEVIN JEFFREY A , BUTLER BRIAN K , PADOVANI ROBERTO , SMEE JOHN E , BENDER PAUL E , WILBORN THOMAS B , HOU JILEI , PFISTER HENRY DAVID , CORALLI ALESSANDRO VANELLI
IPC: H04B1/707
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公开(公告)号：BRPI0406645A
公开(公告)日：2005-12-06
申请号：BRPI0406645
申请日：2004-01-07
Applicant: QUALCOMM INC
Inventor： SMEE JOHN E , MALLADI DURGA P , WALTON JAY R , WILLENEGGER SERGE
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公开(公告)号：CA2787797A1
公开(公告)日：2005-06-09
申请号：CA2787797
申请日：2004-11-12
Applicant: QUALCOMM INC
Inventor： WALTON J RODNEY , KETCHUM JOHN W , SMEE JOHN E , WALLACE MARK S , HOWARD STEVEN J
Abstract: An uplink channel response matrix is obtained for each terminal and decomposed to obtain a steering vector used by the terminal to transmit on the uplink. An "effective" uplink channel response vector is formed for each terminal based on its steering vector and its channel response matrix. Multiple sets of terminals are evaluated based on their effective channel response vectors to determine the best set (e.g., with highest overall throughput) for uplink transmission. Each selected terminal performs spatial processing on its data symbol stream with its steering vector and transmits its spatially processed data symbol stream to an access point. The multiple selected terminals simultaneously transmit their data symbol streams via their respective MIMO channels to the access point. The access point performs receiver spatial processing on its received symbol streams in accordance with a receiver spatial processing technique to recover the data symbol streams transmitted by the selected terminals.
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公开(公告)号：CA2526757A1
公开(公告)日：2004-12-23
申请号：CA2526757
申请日：2004-05-28
Applicant: QUALCOMM INC
Inventor： ABRISHAMKAR FARROKH , GLAZKO SERGUEI , SMEE JOHN E
Abstract: A decision feedback equalizer includes a chip estimate buffer that forms chi p estimates into a vector. A CCK decoder decodes the vector of chip estimates, and a CCK encoder, connected with the CCK decoder, re-encodes the vector of chip estimates into a valid CCK code word. At the same time, a chip slicer provides direct sliced chips from the chip estimates. An update module then forms a hybrid vector from the valid CCK code-word and the direct sliced chi ps for input to the feedback filter of the decision feedback equalizer. The hybrid feedback filter input vector reflects the CCK coding gain of its re- encoded portion thereby reducing the estimated chip error rate to improve th e performance of the decision feedback equalizer.
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