公开(公告)号：CA2510840A1

公开(公告)日：2004-07-08

申请号：CA2510840

申请日：2003-12-17

Applicant: QUALCOMM INC

Inventor： LUNDBY STEIN A ,  WALLACE MARK

IPC: H04B7/005 ,  H04B7/06

Abstract: A time-varying transformation is used to correlate the magnitude of the interference between multiple antenna paths. Embodiments incorporating the time-varying transformations provide transmit diversity gains to remote stations that are not configured for transmit diversity reception. In addition, some of the embodiments can be further configured to balance the load between multiple power amplifiers.

公开(公告)号：AU2003287294A1

公开(公告)日：2004-05-13

申请号：AU2003287294

申请日：2003-10-24

Applicant: QUALCOMM INC

Inventor： HOWARD STEVEN J ,  WALTON J RODNEY ,  KETCHUM JOHN W ,  WALLACE MARK

IPC: H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26 ,  H04W28/20 ,  H04W52/50 ,  H04W74/08 ,  H04B7/00

Abstract: Techniques for facilitating random access in wireless multiple-access communication systems. A random access channel (RACH) is defined to comprise a "fast" RACH (F-RACH) and a "slow" RACH (S-RACH). The F-RACH and S-RACH can efficiently support user terminals in different operating states and employ different designs. The F-RACH can be used to quickly access the system, and the S-RACH is more robust and can support user terminals in various operating states and conditions. The F-RACH may be used by user terminals that have registered with the system and can compensate for their round trip delays (RTDs) by properly advancing their transmit timing. The S-RACH may be used by user terminals that may or may not have registered with the system, and may or may not be able to compensate for their RTDs. The user terminals may use the F-RACH or S-RACH, or both, to gain access to the system.

公开(公告)号：AU2003284943A1

公开(公告)日：2004-05-13

申请号：AU2003284943

申请日：2003-10-27

Applicant: QUALCOMM INC

Inventor： HOWARD STEVEN J ,  WALTON JAY R ,  KETCHUM JOHN W ,  WALLACE MARK

IPC: H04B7/005 ,  H04B7/06 ,  H04B7/08 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26 ,  H04W28/20 ,  H04W52/50

Abstract: For transmit diversity in a multi-antenna OFDM system, a transmitter encodes, interleaves, and symbol maps traffic data to obtain data symbols. The transmitter processes each pair of data symbols to obtain two pairs of transmit symbols for transmission from a pair of antennas either (1) in two OFDM symbol periods for space-time transmit diversity or (2) on two subbands for space-frequency transmit diversity. NT·(NT−1)/2 different antenna pairs are used for data transmission, with different antenna pairs being used for adjacent subbands, where NT is the number of antennas. The system may support multiple OFDM symbol sizes. The same coding, interleaving, and modulation schemes are used for different OFDM symbol sizes to simplify the transmitter and receiver processing. The transmitter performs OFDM modulation on the transmit symbol stream for each antenna in accordance with the selected OFDM symbol size. The receiver performs the complementary processing.

公开(公告)号：AU2003259170A1

公开(公告)日：2004-02-16

申请号：AU2003259170

申请日：2003-07-18

Applicant: QUALCOMM INC

Inventor： WALLACE MARK ,  LUNDBY STEIN A

IPC: H04B1/707 ,  H04B7/02 ,  H04B7/06 ,  H04B7/26 ,  H04B7/04

Abstract: Methods and apparatus are presented to provide transmit diversity gains to non-transmit diversity configured remote stations by correlating the magnitude of the interference between at least two antenna paths. A first time-varying transformation is applied to a stream of modulation symbols to form a first transmission signal and a second time-varying transformation is applied to the stream of modulation symbols to form a second transmission signal, wherein the second time-varying transformation has a different relative phase from the first time-varying transformation.

公开(公告)号：BR0109422A

公开(公告)日：2004-01-13

申请号：BR0109422

申请日：2001-03-20

Applicant: QUALCOMM INC

Inventor： WALTON JAY R ,  WALLACE MARK ,  JALALI AHMAD

IPC: H04J11/00 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04B7/12 ,  H04B7/26 ,  H04J99/00 ,  H04L25/02 ,  H04L27/26 ,  H04Q7/38

Abstract: Transmitter and receiver units for use in a communications system and configurable to provide antenna, frequency, or temporal diversity, or a combination thereof, for transmitted signals. The transmitter unit includes a system data processor, one or more modulators, and one or more antennas. The system data processor receives and partitions an input data stream into a number of channel data streams and further processes the channel data streams to generate one or more modulation symbol vector streams. Each modulation symbol vector stream includes a sequence of modulation symbol vectors representative of data in one or more channel data streams. Each modulator receives and modulates a respective modulation symbol vector stream to provide an RF modulated signal, and each antenna receives and transmits a respective RF modulated signal. Each modulator may include an inverse (fast) Fourier transform (IFFT) and a cyclic prefix generator. The IFFT generates time-domain representations of the modulation symbol vectors, and the cyclic prefix generator repeats a portion of the time-domain representation of each modulation symbol vector. The channel data streams are modulated using multi-carrier modulation, e.g., OFDM modulation. Time division multiplexing (TDM) may also be used to increase flexibility.

公开(公告)号：AU2003213214A1

公开(公告)日：2003-09-09

申请号：AU2003213214

申请日：2003-02-19

Applicant: QUALCOMM INC

Inventor： MEDVEDEV IRINA ,  WALTON JAY R ,  WALLACE MARK

IPC: H04J99/00 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04J11/00 ,  H04L1/00 ,  H04L1/06 ,  H04L27/26

Abstract: Techniques to transmit data on a number of transmission channels in a multi-channel communication system using multiple transmission schemes requiring less channel-state information (CSI). These schemes may include a partial-CSI transmission scheme that transmits a single data stream on each transmit antenna selected for use and a "beam-forming" transmission scheme that allocates all transmit power to a single transmission channel having the best performance. Each transmission scheme may provide good or near-optimum performance for a specific range of operating conditions (or operating SNRs). These multiple transmission schemes may then be combined in a piece-wise fashion to form a "multi-mode" transmission scheme that covers the full range of operating conditions supported by the MIMO system. The specific transmission scheme to be used for data transmission at any given moment would then be dependent on the specific operating condition experienced by the system at that moment.

公开(公告)号：CA2477536A1

公开(公告)日：2003-09-04

申请号：CA2477536

申请日：2003-02-19

Applicant: QUALCOMM INC

Inventor： WALLACE MARK ,  WALTON JAY R ,  MEDVEDEV IRINA

IPC: H04J99/00 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04J11/00 ,  H04L1/00 ,  H04L1/06 ,  H04L27/26

Abstract: Techniques to transmit data on a number of transmission channels in a multi- channel communication system using multiple transmission schemes requiring less channel-state information (CSI). These schemes may include a partial-CS I transmission scheme that transmits a single data stream on each transmit antenna selected for use and a "beam-forming" transmission scheme that allocates all transmit power to a single transmission channel having the bes t performance. Each transmission scheme may provide good or near-optimum performance for a specific range of operating conditions (or operating SNRs) . These multiple transmission schemes may then be combined in a piece-wise fashion to form a "multi-mode" transmission scheme that covers the full rang e of operating conditions supported by the MIMO system. The specific transmission scheme to be used for data transmission at any given moment wou ld then be dependent on the specific operating condition experienced by the system at that moment.

公开(公告)号：AU2002306798A1

公开(公告)日：2002-10-08

申请号：AU2002306798

申请日：2002-03-22

Applicant: QUALCOMM INC

Inventor： WALTON JAY R ,  LING FUNYUN ,  KETCHUM JOHN W ,  HOWARD STEVEN J ,  WALLACE MARK

IPC: H04J99/00 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04L1/00 ,  H04L27/26 ,  H04L1/06

Abstract: Techniques for transmitting data from a transmitter unit to a receiver unit in a multiple-input mutiple-output (MIMO) communication system. In one method, at the receiver unit, a number of signals are received via a number of receive antennas, with the received signal from the transmitter unit. The received signals are processed to derive channel state information (CSI) indicative of characteristics of a number of transmission channels used for data transmission. The CSI is transmitted back to the transmitter unit. At the transmitter unit, the CSI from the receiver unit is received and data for transmission to the receiver units is processed based on the received CSI.

公开(公告)号：AU4934401A

公开(公告)日：2001-10-03

申请号：AU4934401

申请日：2001-03-20

Applicant: QUALCOMM INC

Inventor： WALTON JAY R ,  WALLACE MARK ,  JALALI AHMAD

IPC: H04J11/00 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04B7/12 ,  H04B7/26 ,  H04J99/00 ,  H04L25/02 ,  H04L27/26 ,  H04Q7/38

Abstract: Transmitter and receiver units for use in a communications system and configurable to provide antenna, frequency, or temporal diversity, or a combination thereof, for transmitted signals. The transmitter unit includes a system data processor, one or more modulators, and one or more antennas. The system data processor receives and partitions an input data stream into a number of channel data streams and further processes the channel data streams to generate one or more modulation symbol vector streams. Each modulation symbol vector stream includes a sequence of modulation symbol vectors representative of data in one or more channel data streams. Each modulator receives and modulates a respective modulation symbol vector stream to provide an RF modulated signal, and each antenna receives and transmits a respective RF modulated signal. Each modulator may include an inverse (fast) Fourier transform (IFFT) and a cyclic prefix generator. The IFFT generates time-domain representations of the modulation symbol vectors, and the cyclic prefix generator repeats a portion of the time-domain representation of each modulation symbol vector. The channel data streams are modulated using multi-carrier modulation, e.g., OFDM modulation. Time division multiplexing (TDM) may also be used to increase flexibility.

公开(公告)号：CA2402011A1

公开(公告)日：2001-09-27

申请号：CA2402011

申请日：2001-03-20

Applicant: QUALCOMM INC

Inventor： WALTON JAY R ,  WALLACE MARK ,  JALALI AHMAD

IPC: H04J11/00 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04B7/12 ,  H04B7/26 ,  H04J99/00 ,  H04L25/02 ,  H04L27/26 ,  H04Q7/38

Abstract: Transmitter and receiver units for use in a communications system and configurable to provide antenna, frequency, or temporal diversity, or a combination thereof, for transmitted signals. The transmitter unit includes a system data processor, one or more modulators, and one or more antennas. The system data processor receives and partitions an input data stream into a number of channel data streams and further processes the channel data streams to generate one or more modulation symbol vector streams. Each modulation symbol vector stream includes a sequence of modulation symbol vectors representative of data in one or more channel data streams. Each modulator receives and modulates a respective modulation symbol vector stream to provide an RF modulated signal, and each antenna receives and transmits a respective RF modulated signal. Each modulator may include an inverse (fast) Fourier transform (IFFT) and a cyclic prefix generator. The IFFT generates time-domain representations of the modulation symbol vectors, and the cyclic prefix generator repeats a portion of the time-domain representation of each modulation symbol vector. The channel data streams are modulated using multi-carrier modulation, e.g., OFDM modulation. Time division multiplexing (TDM) may also be used to increase flexibility.