公开(公告)号：CA2601165A1

公开(公告)日：2006-09-21

申请号：CA2601165

申请日：2006-03-16

Applicant: QUALCOMM INC

Inventor： GOROKHOV ALEXEI ,  JI TINGFANG ,  NAGUIB AYMAN ,  SUTIVONG ARAK ,  GORE DHANANJAY ASHOK

IPC: H04J11/00

Abstract: A channel structure has at least two channel sets. Each channel set contains multiple channels and is associated with a specific mapping of the channels to the system resources available for data transmission. Each channel set may be defined based on a channel tree having a hierarchical structure. To achieve intra-cell interference diversity, the channel-to-resource mapping for each channel set is pseudo-random with respect to the mapping for each remaining channel set. In each scheduling interval, terminals are scheduled for transmission on the forward and/or reverse link. The scheduled terminals are assigned channels from the channel sets. Multiple terminals may use the same system resources and their overlapping transmissions may be separated in the spatial domain. For example, beamforming may be performed to send multiple overlapping transmissions on the forward link, and receiver spatial processing may be performed to separate out multiple overlapping transmissions received on the reverse link.

公开(公告)号：ZA200500825B

公开(公告)日：2006-08-30

申请号：ZA200500825

申请日：2005-01-27

Applicant: QUALCOMM INC

Inventor： GROB MATT ,  AGRAWAL AVNEESH ,  SUTIVONG ARAK

IPC: H04B20060101 ,  H04B7/26 ,  H04L1/00 ,  H04L1/18

Abstract: According to one aspect of the invention, a method is provided in which a group of users in a system that employs a retransmission mechanism such as Automatic Repeat Request (ARQ) is divided into multiple sub-groups of users. Each user is assigned a number of channels for transmission of information. The number of channels assigned to each user is determined based, at least in part, on the number of the sub-groups and a number of channels available in the system. Transmission intervals are alternated among the multiple sub-groups such that only one of the sub-groups of users is allowed to transmit information during any transmission interval. An idle interval during which a particular user in the first group does not transmit information is used as a waiting period for acknowledgement of a previous transmission by the particular user.

公开(公告)号：AU2005319083A1

公开(公告)日：2006-06-29

申请号：AU2005319083

申请日：2005-12-22

Applicant: QUALCOMM INC

Inventor： SUTIVONG ARAK ,  AGRAWAL AVNEESH

IPC: H04B1/713 ,  H04L5/02 ,  H04L27/26

Abstract: Techniques are provided to support multi-carrier code division multiple access (MC-CDMA) in an orthogonal uplink of a wireless communication system. A method of wireless multi-carrier communications comprises dividing sub-carriers on an uplink into non-overlapping groups, allocating a time-frequency block including a hopping duration and a non-overlapped group, respectively, assigning a different set of orthogonal codes to each user, spreading data (or pilot) symbols of each user over the allocated time-frequency block, wherein the data (or pilot) symbols of each user are spread using the different set of orthogonal codes assigned to each user, mapping each data (or pilot) symbol to a modulation symbol in the time-frequency block, generating an orthogonal waveform based on the mapped symbols, and transmitting the orthogonal waveform.

公开(公告)号：AU2005267163A1

公开(公告)日：2006-02-02

申请号：AU2005267163

申请日：2005-07-19

Applicant: QUALCOMM INC

Inventor： SUTIVONG ARAK ,  AGRAWAL AVNEESH

IPC: H04B7/005 ,  H04W52/00 ,  H04W52/12 ,  H04W52/20 ,  H04W52/24

Abstract: A closed-loop reverse-link power control algorithm for a frequency hopping orthogonal frequency division multiple access (FH-OFDMA) system is described. The power control algorithm adjusts the user's transmit power based on effective carrier-to-interference (C/I) and Received-Power-Over-Thermal (RpOT) measurements. The algorithm is inherently stable and is effective for FH-OFDMA systems with retransmissions.

公开(公告)号：NO20055915L

公开(公告)日：2006-01-20

申请号：NO20055915

申请日：2005-12-13

Applicant: QUALCOMM INC

Inventor： NAGUIB AYMAN FAWZY ,  AGRAWAL AVNEESH ,  SUTIVONG ARAK

IPC: H04J11/00 ,  G01R31/08 ,  H04B7/005 ,  H04L20060101 ,  H04L27/26

Abstract: A system and method for power control and scheduling of sub-carriers in an OFDM communication system. The receiver dynamic range can be minimized by a power control loop that attempts to maintain received power over a noise floor in a predetermined range. If the received power relative to a noise floor in allocated sub-carriers exceeds the predetermined range and the total received power is at the minimum, the scheduling system allocates an additional sub-carrier to the communication link. Additionally, ifthe received power relative to the noise floor is less than the predetermined range minimum, and the total received power is at a maximum, the scheduling system de-allocates a sub-carrier from the communication link. The scheduling system may also adjust an encoding rate to maintain a relatively constant symbol rate in each sub-carrier.

公开(公告)号：CA2875539A1

公开(公告)日：2006-01-19

申请号：CA2875539

申请日：2005-06-07

Applicant: QUALCOMM INC

Inventor： SUTIVONG ARAK ,  AGRAWAL AVNEESH ,  JULIAN DAVID JONATHAN

IPC: H04W24/10 ,  H04B7/005 ,  H04L1/00 ,  H04L1/20 ,  H04W24/00 ,  H04W28/00 ,  H04W28/04 ,  H04W52/24 ,  H04W52/28 ,  H04W52/36 ,  H04W52/60 ,  H04W88/08

公开(公告)号：AU2005262560A1

公开(公告)日：2006-01-19

申请号：AU2005262560

申请日：2005-06-07

Applicant: QUALCOMM INC

Inventor： JULIAN DAVID JONATHAN ,  SUTIVONG ARAK ,  AVNEESH AGRAWAL

IPC: H04L1/00 ,  H04B7/005 ,  H04L1/20

Abstract: Techniques for performing erasure detection and power control for a transmission without error detection coding are described. For erasure detection, a transmitter transmits codewords via a wireless channel. A receiver computes a metric for each received codeword, compares the computed metric against an erasure threshold, and declares the received codeword to be "erased" or "non-erased". The receiver dynamically adjusts the transmit power based on whether the codewords met the erasure threshold or not.

公开(公告)号：CA2525588A1

公开(公告)日：2004-12-02

申请号：CA2525588

申请日：2004-05-14

Applicant: QUALCOMM INC

Inventor： NAGUIB AYMAN FAWZY ,  AGRAWAL AVNEESH ,  SUTIVONG ARAK

IPC: G01R31/08 ,  H04B7/005 ,  H04L20060101 ,  H04L27/26

Abstract: A system and method for power control and scheduling of sub-carriers in an OFDM communication system. The receiver dynamic range can be minimized by a power control loop that attempts to maintain received power over a noise flo or in a predetermined range. If the received power relative to a noise floor in allocated sub-carriers exceeds the predetermined range and the total receive d power is at the minimum, the scheduling system allocates an additional sub- carrier to the communication link. Additionally, if the received power relative to the noise floor is less than the predetermined range minimum, an d the total received power is at a maximum, the scheduling system de-allocates a sub-carrier from the communication link. The scheduling system may also adju st an encoding rate to maintain a relatively constant symbol rate in each sub- carrier.

公开(公告)号：AU2004241985A1

公开(公告)日：2004-12-02

申请号：AU2004241985

申请日：2004-05-14

Applicant: QUALCOMM INC

Inventor： SUTIVONG ARAK ,  NAGUIB AYMAN FAWZY ,  AGRAWAL AVNEESH

IPC: G01R31/08 ,  H04B7/005 ,  H04L20060101 ,  H04L27/26

Abstract: A system and method for power control and scheduling of sub-carriers in an OFDM communication system. The receiver dynamic range can be minimized by a power control loop that attempts to maintain received power over a noise floor in a predetermined range. If the received power relative to a noise floor in allocated sub-carriers exceeds the predetermined range and the total received power is at the minimum, the scheduling system allocates an additional sub-carrier to the communication link. Additionally, ifthe received power relative to the noise floor is less than the predetermined range minimum, and the total received power is at a maximum, the scheduling system de-allocates a sub-carrier from the communication link. The scheduling system may also adjust an encoding rate to maintain a relatively constant symbol rate in each sub-carrier.

公开(公告)号：AU2002259317A1

公开(公告)日：2002-12-09

申请号：AU2002259317

申请日：2002-05-31

Applicant: QUALCOMM INC

Inventor： SUTIVONG ARAK ,  TERASAWA DAISUKE ,  KATSURI NITIN ,  AGRAWAL AVNEESH ,  DHAWAN RAJAT RAJINDERKUMAR

IPC: H04J13/00 ,  H04L1/00 ,  H04L1/08 ,  H04J13/04 ,  H04B7/26

Abstract: Techniques for efficient W-CDMA modulation are disclosed. In one aspect, a multiplexing/coding chain for use in modulation such as that defined by the W-CDMA specification is disclosed. In another aspect, transport blocks are processed and concatenated, utilizing memory efficiently. This aspect has the further benefit of preparing transport channels for efficient subsequent processing. It also allows for ease of interface with the transport channel source. In another aspect, the use of repeated channel coding is used in lieu of an interleaver memory to provide channel coding and interleaving. These aspects, collectively, yield the advanced benefits of a system, such as W-CDMA, in a hardware efficient manner. The techniques described herein apply equally to both access points and access terminals. The techniques are not limited to W-CDMA systems; they are quite suitable to other systems requiring the various benefits the invention offers. Various other aspects of the invention are also presented.