公开(公告)号：AT443962T

公开(公告)日：2009-10-15

申请号：AT05749438

申请日：2005-05-18

Applicant: QUALCOMM INC

Inventor： SUBRAHMANYAM JAI ,  COUSINEAU KEVIN ,  WANG MICHAEL

IPC: H04L27/26

Abstract: In an OFDM system, multiple (M) interlaces are defined for M non-overlapping sets of frequency subbands, and M slots with fixed indices are also defined. Data streams and pilot are mapped to slots, which are in turn mapped to interlaces based on a slot-to-interlace mapping scheme that can achieve frequency diversity and good performance for all slots. At a transmitter, a slot-to-interlace converter maps the slots to the interlaces. The slot-to-interlace converter includes multiple multiplexers and a control unit. The multiplexers map the M slots to the M interlaces based on the slot-to-interlace mapping scheme. The control unit generates at least one control signal for the multiplexers. The multiplexers may be arranged and controlled in various manners depending on the slot-to-interlace mapping scheme. At a receiver, a complementary interlace-to-slot converter maps the interlaces to the slots.

公开(公告)号：CA2663980C

公开(公告)日：2017-11-14

申请号：CA2663980

申请日：2007-10-24

Applicant: QUALCOMM INC

Inventor： GOROKHOV ALEXEI ,  KHANDEKAR AAMOD ,  WANG MICHAEL

IPC: H04W48/12 ,  H04B1/707 ,  H04B1/76 ,  H04J11/00

Abstract: System(s) and method(s) are provided to facilitate generating and processing acquisition pilots in wireless communications. Acquisition pilots that convey timing and frequency synchronization information, wireless system acquisition and system determination information are modulated with pseudorandom sequences. The R bits of information carried by the acquisition pilot that conveys system determination information are augmented with T bits that convey a counter index associated with the system timing of superframes transmitted from an access point. The processing overhead resulting from the addition of the T bits is offset by the advantages afforded to a wireless communication. Salient advantages include: (i) processing gain at a receiver for communication in a specific sector during asynchronous operation, (ii) packet boundary determination through the counter field values, and (iii) initialization of various pseudorandom registers employed for communication.

公开(公告)号：AT450962T

公开(公告)日：2009-12-15

申请号：AT06738060

申请日：2006-03-10

Applicant: QUALCOMM INC

Inventor： WANG MICHAEL ,  VRCELJ BOJAN ,  MUKKAVILLI KRISHNA ,  KRISHNAMOORTHI RAGHURAMAN ,  MANTRAVADI ASHOK

IPC: H04L25/02 ,  H04L5/02

Abstract: Systems and methods are provided for the transmission of waveforms to aid channel estimation, timing synchronization, and AGC bootstrapping in a wireless network. The method includes inserting at least one TDM pilot symbol located at a transition between wide area and local area waveforms to facilitate decoding of the transmission block.

公开(公告)号：MX2007001166A

公开(公告)日：2007-07-11

申请号：MX2007001166

申请日：2005-07-29

Applicant: QUALCOMM INC

Inventor： VIJAYAN RAJIV ,  MURALI RAMASWAMY ,  LING FUYUN ,  WANG MICHAEL

IPC: H04L1/00

Abstract: Un sistema y metodo para diversidad de tiempo utiliza intercalacion; para simplificar la operacion tanto en trasmisores como en receptores, se puede utilizar una formula para determinar el mapeo de ranura a entrelazado en un tiempo de simbolo OFDM determinado.

公开(公告)号：AT460037T

公开(公告)日：2010-03-15

申请号：AT06737928

申请日：2006-03-09

Applicant: QUALCOMM INC

Inventor： VRCELJ BOJAN ,  MANTRAVADI ASHOK ,  LING FUYUN ,  VIJAYAN RAJIV ,  WANG MICHAEL

IPC: H04L27/26

Abstract: A method for positioning a collection window for a Fourier transform function is disclosed. A first orthogonal frequency division multiplexing (OFDM) symbol and a second OFDM symbol are received. The first OFDM symbol comprises a plurality of frequency division multiplexed (FDM) symbols. The first OFDM symbol is characterized by at least two of the following: a delay spread, a first arriving path (FAP), or a last arriving path (LAP). A channel location is estimated from a channel impulse response. A point relative to the channel location is selected. A beginning of the collection window is positioned for the second OFDM symbol at the selected point. Alternatively, a point is selected at a first location relative to the channel location using a first algorithm if a delay spread is less than a predetermined length. The selected point is chosen at a second location relative to the channel location using a second algorithm if the delay spread is greater than the predetermined length.

公开(公告)号：DE602005016794D1

公开(公告)日：2009-11-05

申请号：DE602005016794

申请日：2005-05-18

Applicant: QUALCOMM INC

Inventor： SUBRAHMANYAM JAI N ,  COUSINEAU KEVIN S ,  WANG MICHAEL

IPC: H04L27/26

Abstract: In an OFDM system, multiple (M) interlaces are defined for M non-overlapping sets of frequency subbands, and M slots with fixed indices are also defined. Data streams and pilot are mapped to slots, which are in turn mapped to interlaces based on a slot-to-interlace mapping scheme that can achieve frequency diversity and good performance for all slots. At a transmitter, a slot-to-interlace converter maps the slots to the interlaces. The slot-to-interlace converter includes multiple multiplexers and a control unit. The multiplexers map the M slots to the M interlaces based on the slot-to-interlace mapping scheme. The control unit generates at least one control signal for the multiplexers. The multiplexers may be arranged and controlled in various manners depending on the slot-to-interlace mapping scheme. At a receiver, a complementary interlace-to-slot converter maps the interlaces to the slots.

公开(公告)号：CA2703967A1

公开(公告)日：2009-01-29

申请号：CA2703967

申请日：2008-07-25

Applicant: QUALCOMM INC

Inventor： MANTRAVADI ASHOK ,  CHARI MURALI RAMASWAMY ,  WANG MICHAEL ,  LING FUYUN ,  VIJAYAN RAJIV ,  KRISHNAMOORTHI RAGHURAMAN

IPC: H04L27/26 ,  H03M13/27 ,  H04L1/00 ,  H04L5/02

Abstract: A system and method for frequency diversity uses interleaving in a wireless communication system utilizing orthogonal frequency division multiplexing (OFDM) with various FFT sizes. Subcarriers of one or more interlaces are interleaved in a bit reversal fashion and the one or more interlaces are interleaved.

公开(公告)号：AR049428A1

公开(公告)日：2006-08-02

申请号：ARP050102050

申请日：2005-05-18

Applicant: QUALCOMM INC

Inventor： SUBRAHMANYAM JAI N ,  COUSINEAU KEVIN S ,  WANG MICHAEL

IPC: H04L27/26

Abstract: En un sistema OFDM, los entrelaces multiples (M) se definen para conjuntos de sub-bandas de frecuencia que no se superponen M, y también se definen las ranuras M con índices fijos. Los flujos de datos y las ondas piloto se distribuyen en ranuras que, a su vez, son distribuidas en entrelaces en base a un esquema de distribucion ranura-a-entrelace que puede lograr diversidad de frecuencia y un buen rendimiento para todas las ranuras. En un transmisor, un conversor ranura-a-entrelace distribuye las ranuras en los entrelaces. El conversor ranura-a-entrelace incluye varios multiplexores y una unidad de control. Los multiplexores distribuyen las ranuras M en los entrelaces M en base a un esquema de distribucion ranura-a-entrelace. La unidad de control genera, por lo menos una senal de control para los multiplexores. Los multiplexores pueden ordenarse y controlarse de distintas maneras segun el esquema de distribucion ranura-a-entrelace. En un receptor, un conversor entrelace- a-ranura complementario distribuye los entrelaces en las ranuras.

公开(公告)号：ES2735984T3

公开(公告)日：2019-12-23

申请号：ES09792915

申请日：2009-09-23

Applicant: QUALCOMM INC

Inventor： WANG MICHAEL ,  PALANKI RAVI

IPC: H04W64/00 ,  H04L5/00

Abstract: Procedimiento (900) utilizado en una red de comunicación (202), que comprende: identificar (902), mediante un aparato de comunicación inalámbrica (204) como una función de una identificación de grupo de células, una posición de transmisión de al menos un símbolo en el que se va a transmitir un piloto altamente detectable, en el que el al menos un símbolo es al menos un símbolo de datos, crear, mediante dicho aparato de comunicación inalámbrica, una combinación del al menos un símbolo y un segundo símbolo; y transmitir (904), desde dicho aparato de comunicación inalámbrica, el piloto altamente detectable en una parte de la combinación, en el que el piloto altamente detectable se transmite utilizando dos símbolos de dicha combinación a uno o más receptores (206) para una determinación de la posición de cualquiera de dichos uno o más receptores.

公开(公告)号：AT511284T

公开(公告)日：2011-06-15

申请号：AT07798457

申请日：2007-06-12

Applicant: QUALCOMM INC

Inventor： WANG MICHAEL

IPC: H04L27/26 ,  H04W36/30 ,  H04W36/36

Abstract: Techniques for sending sector/system information in TDM pilots using a hierarchical pilot structure are described. A base station sends multiple sets of bits for the sector/system information in multiple TDM pilots. The set of bits sent in a given TDM pilot may include bits sent in earlier TDM pilots. In one design, the base station generates a first TDM pilot based on a first set of bits, generates a second TDM pilot based on a second set of bits that includes the first set, generates a third TDM pilot based on all bits for the information, and sends the TDM pilots. A terminal performs detection to obtain a first detected value for the first TDM pilot, performs detection based on the first detected value to obtain a second detected value for the second TDM pilot, and performs detection based on the first and second detected values to obtain a third detected value for the third TDM pilot.