公开(公告)号：AU2003261440C1

公开(公告)日：2010-06-03

申请号：AU2003261440

申请日：2003-08-07

Applicant: QUALCOMM INC

Inventor： NOVICHKOV VLADIMIR ,  RICHARDSON TOM ,  JIN HUI

IPC: H03M13/00 ,  G06F11/00 ,  H04L1/00

Abstract: Methods and apparatus for scaling soft values as part of an error correction decoding process are described. Accurate decoding depends on use of the appropriate scale factor. Selection and use of the scale factor to scale soft values is designed to improve and/or optimize decoder performance without the need for prior knowledge of the correct scale factor or the actual channel conditions at the time the signal from which the soft values were obtained was transmitted through a communications channel. The techniques of the present invention assume that the soft values to be processed were transmitted through a communications channel having a quality that can be accurately described by a channel quality value. A scale factor is determined from the distribution of soft values to be scaled and an assumption that the channel through which they were transmitted was of the quality corresponding to a preselected channel quality value.

公开(公告)号：DE602006013468D1

公开(公告)日：2010-05-20

申请号：DE602006013468

申请日：2006-07-08

Applicant: QUALCOMM INC

Inventor： LAROIA RAJIV ,  LI JUNYI ,  JIN HUI

IPC: H04L25/06 ,  H04B1/12 ,  H04L27/26

Abstract: Special DC tone treatment in a wireless communications system, e.g., an OFDM system, is discussed. In the downlink, a wireless terminal receiver introduces self-interference at the DC tone from the RF/baseband conversion. A base station every so often does not transmit on the downlink DC tone while continuing to transmit on other downlink tones. Wireless terminals measure received signal on the downlink DC tone during the time of suspended DC tone transmission, estimate self-interference and apply a correction to other received downlink DC tones. In the uplink DC tone interference is a composite of the assigned wireless terminal transmitter's baseband/RF conversion self-interference and air link noise. During one symbol interval of an N symbol interval dwell, the uplink DC tone is reserved for a special modulation symbol, which is a predetermined function of the other N-1 modulation symbols. At the base station, its receiver receives a set of modulation symbols conveyed by the uplink DC tone for a dwell, calculates the average DC component and corrects the received N-1 modulation symbols.

公开(公告)号：AU2010200856A1

公开(公告)日：2010-04-01

申请号：AU2010200856

申请日：2010-03-05

Applicant: QUALCOMM INC

Inventor： RICHARDSON TOM ,  JIN HUI

IPC: H03M13/00

Abstract: A flexible and relatively hardware efficient LDPC encoder is described. The encoder can be implemented with a level of parallelism which is less than the full parallelism of the code structure used to control the encoding process. Each command of a relatively simple microcode used to describe the code structure can be stored and executed multiple times to complete the encoding of a codeword. Different codeword lengths can be supported using the same set of microcode instructions but with the code being implemented a different number of times depending on the lifting factor selected to be used. The LDPC encoder can switch between encoding codewords of different lengths, without the need to change the stored code description information, by simply changing a code lifting factor used to control the encoding processes. When coding codewords shorter than the maximum supported codeword length some block storage locations and/or registers may go unused.

公开(公告)号：AU2010200854A1

公开(公告)日：2010-04-01

申请号：AU2010200854

申请日：2010-03-05

Applicant: QUALCOMM INC

Inventor： RICHARDSON TOM ,  JIN HUI

IPC: H03M13/00

Abstract: A flexible and relatively hardware efficient LDPC encoder is described. The encoder can be implemented with a level of parallelism which is less than the full parallelism of the code structure used to control the encoding process. Each command of a relatively simple microcode used to describe the code structure can be stored and executed multiple times to complete the encoding of a codeword. Different codeword lengths can be supported using the same set of microcode instructions but with the code being implemented a different number of times depending on the lifting factor selected to be used. The LDPC encoder can switch between encoding codewords of different lengths, without the need to change the stored code description information, by simply changing a code lifting factor used to control the encoding processes. When coding codewords shorter than the maximum supported codeword length some block storage locations and/or registers may go unused.

公开(公告)号：HK1124198A1

公开(公告)日：2009-07-03

申请号：HK09101940

申请日：2009-03-02

Applicant: QUALCOMM INC

Inventor： RICHARDSON TOM ,  JIN HUI ,  LI JUNYI ,  PARIZHSKY VLADIMIR

IPC: H04W20090101 ,  H04W28/18 ,  H04W52/08 ,  H04W52/14

Abstract: In a first mode of dedicated control channel (DCCH) operation, a wireless terminal is allocated more segments than in a second mode. The wireless terminal uses different information bit to modulation symbol mapping in the different modes. On a per DCCH segment basis, the same number of modulation symbols are communicated in either mode but more information bits are conveyed in the second mode. Information bits for a DCCH segment are partitioned into two subsets. The two subsets are used to generate another set, each of the two subsets and the another set are input to the same mapping function to generate three equal size sets of modulation symbols which are transmitted via the DCCH segment. Uplink tone hopping is used such that one of the equal size sets of modulation symbols for the DCCH segment uses the same tone but a different set uses a different tone.

公开(公告)号：AT515170T

公开(公告)日：2011-07-15

申请号：AT06848990

申请日：2006-12-20

Applicant: QUALCOMM INC

Inventor： RICHARDSON TOM ,  JIN HUI ,  LI JUNYI ,  PARIZHSKY VLADIMIR

IPC: H04W72/12 ,  H04W28/18 ,  H04W52/08 ,  H04W52/14

Abstract: In a first mode of dedicated control channel (DCCH) operation, a wireless terminal is allocated more segments than in a second mode. The wireless terminal uses different information bit to modulation symbol mapping in the different modes. On a per DCCH segment basis, the same number of modulation symbols are communicated in either mode but more information bits are conveyed in the second mode. Information bits for a DCCH segment are partitioned into two subsets. The two subsets are used to generate another set, each of the two subsets and the another set are input to the same mapping function to generate three equal size sets of modulation symbols which are transmitted via the DCCH segment. Uplink tone hopping is used such that one of the equal size sets of modulation symbols for the DCCH segment uses the same tone but a different set uses a different tone.

公开(公告)号：AT474384T

公开(公告)日：2010-07-15

申请号：AT06787643

申请日：2006-07-19

Applicant: QUALCOMM INC

Inventor： LAROIA RAJIV ,  JIN HUI ,  LI JUNYI ,  LANE FRANK ,  RICHARDSON TOM

IPC: H04B7/26

Abstract: Downlink traffic channel data rate options and methods of indicating to a wireless terminal a utilized downlink data rate option are described. The downlink traffic channel rate option for a segment is conveyed using an assignment signal and/or a block in the downlink traffic channel segment which is not used for user data. Downlink segment assignment signals in some implementations allocate fewer bits for rate option indication than are required to uniquely identify each option. In some implementations low rate options, e.g., using QPSK, are uniquely identified via assignment signals. Higher rate options, e.g., using QAM16 modulation, are conveyed via the distinct information block in the downlink traffic segment using a first coding/modulation method. Still higher rate options, e.g., using QAM16, QAM64, or QAM256, are conveyed via the information block in the segment using a second coding/modulation method which is applied to the rate option information.

公开(公告)号：NZ553354A

公开(公告)日：2010-06-25

申请号：NZ55335405

申请日：2005-07-20

Applicant: QUALCOMM INC

Inventor： RICHARDSON TOM ,  JIN HUI

IPC: H03M13/00

Abstract: A Low Density Parity Check (LDPC) encoder is disclosed. The encoder includes: a memory module including at least N x L x K storage locations, where N and L are positive integers and K is an integer >1; a controllable permuter for performing element re-ordering operations on at least N elements coupled to said memory module; a vector accumulator module including N accumulators arranged in parallel, including a first input at least N bits wide corresponding to an output of said controllable permuter, a second input at least N bits wide, and a vector accumulator output at least N bits wide; a controllable storage device including N x K storage locations, including a block select control signal input for receiving a signal indicating a block of at least N storage locations to be accessed and a storage device output at least N bits wide for outputting values read from said storage device; and a block selection module coupled to said controllable storage device for supplying a block selection control signal to said controllable storage device.

公开(公告)号：AU2003261440B2

公开(公告)日：2009-12-24

申请号：AU2003261440

申请日：2003-08-07

Applicant: QUALCOMM INC

Inventor： NOVICHKOV VLADIMIR ,  RICHARDSON TOM ,  JIN HUI

IPC: H03M13/00 ,  G06F11/00 ,  H04L1/00

Abstract: Methods and apparatus for scaling soft values as part of an error correction decoding process are described. Accurate decoding depends on use of the appropriate scale factor. Selection and use of the scale factor to scale soft values is designed to improve and/or optimize decoder performance without the need for prior knowledge of the correct scale factor or the actual channel conditions at the time the signal from which the soft values were obtained was transmitted through a communications channel. The techniques of the present invention assume that the soft values to be processed were transmitted through a communications channel having a quality that can be accurately described by a channel quality value. A scale factor is determined from the distribution of soft values to be scaled and an assumption that the channel through which they were transmitted was of the quality corresponding to a preselected channel quality value.

公开(公告)号：CA2681618A1

公开(公告)日：2008-12-11

申请号：CA2681618

申请日：2008-05-27

Applicant: QUALCOMM INC

Inventor： RICHARDSON THOMAS ,  JIN HUI ,  LAROIA RAJIV

IPC: H04L5/02 ,  H04B7/005 ,  H04B7/06 ,  H04B14/02 ,  H04L1/00 ,  H04L25/02 ,  H04L25/49 ,  H04L27/26

Abstract: Methods and apparatus for improving the utilization of air link resources in a wireless communications system, e.g., an OFDM MIMO system, including a base station with multiple transmit antennas are described. Superposition s ignaling in the downlink is employed. The superimposed signal includes a fir st transform result signal and a second lower power signal. The first transf orm result signal is generated from a first signal, which uses position modu lation, e.g., including null components and high power non-null components. Different components of the first transform result signal are directed to di fferent transmit antennas. The first transform result signal communicates in formation to a first wireless terminal, e.g., a weak receiver. The non-null received elements of the first transform result signal are utilized by a sec ond wireless terminal, e.g., a superior receiver, as pilots to determine a c hannel estimate. The second wireless terminal uses the determined channel es timate to demodulate received second signals.