公开(公告)号：BR0206877A

公开(公告)日：2005-02-01

申请号：BR0206877

申请日：2002-01-23

Applicant: QUALCOMM INC

Inventor： LING FUYUN ,  SINDHUSHAYANA NAGABHUSHANA T ,  WALTON JAY R ,  WALLACE MARK ,  FERNANDEZ IVAN

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

Abstract: Decoding techniques for a (e.g., OFDM) communication system capable of transmitting data on a number of transmission channels. The received data is processed by generating log likelihood ratio streams, processing these streams and decoding the processed streams to obtain information bit streams.

公开(公告)号：BR0210559A

公开(公告)日：2004-10-05

申请号：BR0210559

申请日：2002-06-17

Applicant: QUALCOMM INC

Inventor： JALALI AHMAD ,  SMEE JOHN E ,  WALLACE MARK

IPC: H04J11/00 ,  H04J3/00 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L5/22 ,  H04L25/02 ,  H04L25/03 ,  H04Q7/28 ,  H04L27/26

Abstract: A method of wireless communication is disclosed, the method comprising transmitting at least one pilot reference from a plurality of antennas of a base station; receiving, at the base station, calibration information for a forward link from a terminal responsive to the at least one pilot reference; determining, at the base station, calibration information for a reverse link based upon signals transmitted from the terminal; and generating a calibration function for transmission to the terminal based upon the calibration information for the forward link and calibration information for the reverse link.

公开(公告)号：AU2003287297A1

公开(公告)日：2004-05-13

申请号：AU2003287297

申请日：2003-10-24

Applicant: QUALCOMM INC

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

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 ,  H04L27/00 ,  H04L27/26 ,  H04W16/28 ,  H04W28/20 ,  H04W52/50

Abstract: Pilots suitable for use in MIMO systems and capable of supporting various functions are described. The various types of pilot include-a beacon pilot, a MIMO pilot, a steered reference or steered pilot, and a carrier pilot. The beacon pilot is transmitted from all transmit antennas and may be used for timing and frequency acquisition. The MIMO pilot is transmitted from all transmit antennas but is covered with different orthogonal codes assigned to the transmit antennas. The MIMO pilot may be used for channel estimation. The steered reference is transmitted on specific eigenmodes of a MIMO channel and is user terminal specific. The steered reference may be used for channel estimation. The carrier pilot may be transmitted on designated subbands/antennas and may be used for phase tracking of a carrier signal. Various pilot transmission schemes may be devised based on different combinations of these various types of pilot.

公开(公告)号：CA2756741A1

公开(公告)日：2004-05-06

申请号：CA2756741

申请日：2003-10-27

Applicant: QUALCOMM INC

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

IPC: H04J11/00 ,  H04B7/005 ,  H04B7/02 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L1/16 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26 ,  H04W28/20 ,  H04W52/50

Abstract: System traffic may be arranged into different categories (e.g., control data, user data, and pilot data). For each category, one or more OFDM symbols of the proper sizes may be selected for use based on the expected payload size for the traffic in that category. For example, control data may be transmitted using OFDM symbols of a first size, user data may be transmitted using OFDM symbols of the first size and a second size, and pilot data may be transmitted using OFDM symbols of a third size or the first size. In one exemplary design, a small OFDM symbol is utilized for pilot and for transport channels used to send control data, and a large OFDM symbol and the small OFDM symbol are utilized for transport channels used to send user data.

公开(公告)号：CA2502801A1

公开(公告)日：2004-05-06

申请号：CA2502801

申请日：2003-10-24

Applicant: QUALCOMM INC

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

IPC: H04J99/00 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L5/14 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26

Abstract: In one embodiment, pilots are transmitted on the downlink and uplink channel s and used to derive estimates of the downlink and uplink channel responses, respectively. Two sets of correction factors are then determined based on th e estimates of the downlink and uplink channel responses. A calibrated downlin k channel is formed by using a first set of correction factors for the downlin k channel, and a calibrated uplink channel is formed by using a second set of correction factors for the uplink channel. The first and second sets of correction factors may be determined using a matrix-ratio computation or a minimum mean square error (MMSE) computation. The calibration may be perform ed in real-time based on over-the-air transmission.

公开(公告)号：HK1056805A1

公开(公告)日：2004-02-27

申请号：HK03109155

申请日：2003-12-16

Applicant: QUALCOMM INC

Inventor： JALALI AHMAD ,  WALTON JAY R ,  WALLACE MARK

IPC: H04J11/00 ,  H04B7/06 ,  H04L1/00 ,  H04L1/06 ,  H04L5/02 ,  H04L12/801 ,  H04L12/851 ,  H04L27/26

Abstract: Transmitter and receiver units for use in an OFDM communications system and configurable to support multiple types of services. The transmitter unit includes one or more encoders, a symbol mapping element, and a modulator. Each encoder receives and codes a respective channel data stream to generate a corresponding coded data stream. The symbol mapping element receives and maps data from the coded data streams to generate modulation symbol vectors, with each modulation symbol vector including a set of data values used to modulate a set of tones to generate an OFDM symbol. The modulator modulates the modulation symbol vectors to provide a modulated signal suitable for transmission. The data from each coded data stream is mapped to a respective set of one or more "circuits".; Each circuit can be defined to include a number of tones from a number of OFDM symbols, a number of tones from a single OFDM symbol, all tones from one or more OFDM symbols, or some other combination of tones. The circuits can have equal size or different sizes. Different circuits can be used for full rate data (e.g., active speech) and low rata data (e.g., silence periods).

公开(公告)号：BR0109693A

公开(公告)日：2004-01-13

申请号：BR0109693

申请日：2001-03-20

Applicant: QUALCOMM INC

Inventor： WALLACE MARK ,  WALTON JAY R ,  JALALI AHMAD

IPC: H04J11/00 ,  H04B1/707 ,  H04B7/06 ,  H04B7/08 ,  H04B7/12 ,  H04B7/26 ,  H04B17/00 ,  H04J99/00 ,  H04L25/02 ,  H04L27/26 ,  H04W52/08 ,  H04W52/42

Abstract: The invention relates to a method for transmitting pilot signals used for measuring and reporting channel state information, CSI, in a multiple input/multiple output, MIMO, system, comprising: generating a pilot sequence by using a maximal-length shift register sequence, m-sequence; assigning a different shift to multiple transmit antennas, wherein the value of the shift is dependent on at least one characteristic of the communication channel; generating a pilot signal at each transmit antenna by shifting the pilot sequence by the value specified by the shift; and transmitting the pilot signal via the transmit antenna.

公开(公告)号：NO20100306A

公开(公告)日：2004-01-06

申请号：NO20100306

申请日：2010-03-04

Applicant: QUALCOMM INC

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

IPC: H04B7/08 ,  H04J99/00 ,  H04B7/06 ,  H04B7/10 ,  H04B7/12 ,  H04L1/00 ,  H04L27/06

CPC classification number: H04B7/0417 ,  H04B7/0626 ,  H04B7/0689 ,  H04B7/0697 ,  H04B7/0854 ,  H04B7/10 ,  H04B7/12 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/0048 ,  H04L1/005 ,  H04L1/0071

Abstract: Techniques to 'successively' process received signals at a receiver unit in a MIMO system to recover transmitted data, and to 'adaptively' process data at a transmitter unit based on channel state information available for the MIMO channel. A successive cancellation receiver processing technique is used to process the received signals and performs a number of iterations to provide decoded data streams. For each iteration, input (e.g., received) signals for the iteration are processed to provide one or more symbol streams. One of the symbol streams is selected and processed to provide a decoded data stream. The interference due to the decoded data stream is approximately removed (i.e., canceled) from the input signals provided to the next iteration. The channel characteristics are estimated and reported back to the transmitter system and used to adjust (i.e., adapt) the processing (e.g., coding, modulation, and so on) of data prior to transmission.

公开(公告)号：AU2002357783A1

公开(公告)日：2003-06-23

申请号：AU2002357783

申请日：2002-12-03

Applicant: QUALCOMM INC

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

IPC: H04J99/00 ,  H04B7/04 ,  H04L1/00 ,  H04L25/03 ,  H04L27/26 ,  H04B7/00

Abstract: Techniques for processing a data transmission at the transmitter and receiver. In an aspect, a time-domain implementation is provided which uses frequency-domain singular value decomposition and “water-pouring” results to derive time-domain pulse-shaping and beam-steering solutions at the transmitter and receiver. The singular value decomposition is performed at the transmitter to determine eigen-modes (i.e., spatial subchannels) of the MIMO channel and to derive a first set of steering vectors used to “precondition” modulation symbols. The singular value decomposition is also performed at the receiver to derive a second set of steering vectors used to precondition the received signals such that orthogonal symbol streams are recovered at the receiver, which can simplify the receiver processing. Water-pouring analysis is used to more optimally allocate the total available transmit power to the eigen-modes, which then determines the data rate and the coding and modulation scheme to be used for each eigen-mode.

公开(公告)号：AU2002309674B8

公开(公告)日：2002-11-25

申请号：AU2002309674

申请日：2002-05-07

Applicant: QUALCOMM INC

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

IPC: H04J99/00 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04B7/12 ,  H04L1/00

Abstract: Techniques to 'successively' process received signals at a receiver unit in a MIMO system to recover transmitted data, and to 'adaptively' process data at a transmitter unit based on channel state information available for the MIMO channel. A successive cancellation receiver processing technique is used to process the received signals and performs a number of iterations to provide decoded data streams. For each iteration, input (e.g., received) signals for the iteration are processed to provide one or more symbol streams. One of the symbol streams is selected and processed to provide a decoded data stream. The interference due to the decoded data stream is approximately removed (i.e., canceled) from the input signals provided to the next iteration. The channel characteristics are estimated and reported back to the transmitter system and used to adjust (i.e., adapt) the processing (e.g., coding, modulation, and so on) of data prior to transmission.