公开(公告)号：JP2010193465A

公开(公告)日：2010-09-02

申请号：JP2010047776

申请日：2010-03-04

Applicant: Qualcomm Inc ,  クゥアルコム・インコーポレイテッドQualcomm Incorporated

Inventor： JAYARAMAN SRIKANT ,  SMEE JOHN E ,  FERNANDEZ CORBATON IVAN JESUS

IPC: H04B1/707 ,  H04B7/005 ,  H04B7/02 ,  H04L25/03

CPC classification number: H04L25/03038 ,  H04B7/022 ,  H04L25/0244 ,  H04L25/0256 ,  H04L2025/03375 ,  H04L2025/03426 ,  H04L2025/03477 ,  H04L2025/03605 ,  H04W24/00 ,  H04W36/08 ,  H04W36/18

Abstract: PROBLEM TO BE SOLVED: To provide the equalization of multiple signals received by a terminal in soft handoff.
SOLUTION: A received signal at a terminal is conditioned and digitized to provide a stream of received samples (y
m ) which is then equalized and filtered with multiple sets of coefficients to provide multiple streams of transmit chip estimates (X
k ). One set of coefficients (f
k ) is provided for each base station and used to provide a corresponding stream of transmit chip estimates. The multiple streams of transmit chip estimates are further processed to provide multiple streams of data symbol estimates (d
k ), and one stream of data symbol estimates for each base station. The multiple streams of data symbol estimates are then scaled with multiple scaling factors (α
k ) and combined to provide a stream of combined data symbol estimates. Processing for the multiple base stations may be performed by a single hardware unit in a time division multiplexed manner.
COPYRIGHT: (C)2010,JPO&INPIT

Abstract translation: 要解决的问题：为了在软切换中提供由终端接收的多个信号的均衡。 解决方案：对终端处的接收信号进行调节和数字化以提供接收样本流（y m ），然后将其与多组系数进行均衡和滤波，以提供多个传输流 芯片估计（X k ）。 为每个基站提供一组系数（f k ），并用于提供相应的发射芯片估计流。 进一步处理多个传输码片估计流，以提供多个数据符号估计数据流（d k SB），以及每个基站的一个数据符号估计流。 然后用多个缩放因子（α k SB）对数据符号估计的多个流进行缩放，并组合以提供组合的数据符号估计流。 多个基站的处理可以由时分多路复用的单个硬件单元执行。 版权所有（C）2010，JPO＆INPIT

公开(公告)号：WO03028246A2

公开(公告)日：2003-04-03

申请号：PCT/US0230345

申请日：2002-09-24

Applicant: QUALCOMM INC

Inventor： SMEE JOHN E ,  FERNANDEZ-CORBATON IVAN JESUS ,  JAYARAMAN SRIKANT

IPC: H04B7/005 ,  H04B3/06 ,  H04L25/03 ,  H04B7/00

CPC classification number: H04L25/03038 ,  H04L2025/03375 ,  H04L2025/03585

Abstract: Systems and methods are described for adjusting the number of taps in an adaptive equalizer as the rate of change of a communications channel varies. The number of taps is adjusted based on an estimate of the Doppler frequency between the devices communicating over a channel. The Doppler frequency reflects the rate of change of the communications channel. Greater Doppler frequencies indicate a more quickly varying channel. It is therefore desirable to change the equalizer length (by adding or dropping taps) based on a measurement of the Doppler frequency. Equalizer length is increased as the Doppler frequency decreases. Conversely, equalizer length is decreased as the Doppler frequency increases. This enables the equalizer to achieve a better compromise between the competing goals of adaptation speed (less taps) and ISI reduction (more taps).

Abstract translation: 描述了系统和方法，用于随着通信信道的变化率的变化而调整自适应均衡器中的抽头数量。 基于通过信道通信的设备之间的多普勒频率的估计来调节抽头的数量。 多普勒频率反映通信信道的变化率。 更大的多普勒频率表示一个更快速变化的通道。 因此，希望基于多普勒频率的测量来改变均衡器长度（通过添加或删除抽头）。 均衡器长度随着多普勒频率的降低而增加。 相反，均衡器长度随着多普勒频率的增加而减小。 这使得均衡器能够在适应速度（较少的抽头）和ISI减少（更多的抽头）的竞争目标之间实现更好的折中。

公开(公告)号：WO2005071867A3

公开(公告)日：2005-11-17

申请号：PCT/US2005001591

申请日：2005-01-20

Applicant: QUALCOMM INC ,  GROB MATTHEW S ,  BLACK PETER J ,  JAYARAMAN SRIKANT ,  JACOBS PAUL E

Inventor： GROB MATTHEW S ,  BLACK PETER J ,  JAYARAMAN SRIKANT ,  JACOBS PAUL E

IPC: H04L5/02 ,  H04L27/26 ,  H04B7/26

CPC classification number: H04L5/026 ,  H04L27/2607

Abstract: Synchronized broadcast transmits a same broadcast content using a same waveform from multiple transmitters. Transmitters each apply a same spreading code for broadcast transmissions. In a spread-spectrum communication system having a time division multiplexed forward link, a synchronized broadcast transmission is inserted into a broadcast slot. One embodiment employs an Orthogonal Frequency Divisional Multiplex (OFDM) waveform for the synchronized broadcast. An OFDM receiver is then used to process the received synchronized broadcast transmission. An alternate embodiment implements a broadcast Pseudo-random Noise (PN) code for use by multiple transmitters. An equalizer is then employed to estimate the synchronized broadcast transmission.

Abstract translation: 同步广播使用来自多个发射机的相同波形发送相同的广播内容。 发射机各自为广播传输应用相同的扩频码。 在具有时分多路复用前向链路的扩频通信系统中，同步广播传输被插入广播时隙。 一个实施例针对同步广播采用正交频分复用（OFDM）波形。 然后使用OFDM接收机来处理接收到的同步广播传输。 替代实施例实现了由多个发射机使用的广播伪随机噪声（PN）码。 然后使用均衡器来估计同步的广播传输。

公开(公告)号：WO2007024934A3

公开(公告)日：2007-06-07

申请号：PCT/US2006032899

申请日：2006-08-22

Applicant: QUALCOMM INC ,  JAYARAMAN SRIKANT ,  NAMGOONG JUNE

Inventor： JAYARAMAN SRIKANT ,  NAMGOONG JUNE

IPC: H04L25/02

CPC classification number: H04L25/0232 ,  H04L25/0222 ,  H04L27/2647

Abstract: A time averaging filter for channel estimation is described. Different time averaging is used for different taps or tones of a communication system. Two methods are suggested for determining the time-averaging filter for channel estimation for the communication systems without prior knowledge of SNR, channel Doppler and fading statistics. The first method includes a bank of different filters, each tuned for optimality in a certain range of SNR and Doppler. For each tone in the frequency domain (or tap in the time domain), the first method selects a filter among the set of filters that minimizes a certain computed metric. The second method directly computes, at each tone (or tap), the "best" filter in a least-squares sense, using empirically determined second-order statistics.

Abstract translation: 描述了用于信道估计的时间平均滤波器。 不同的时间平均用于通信系统的不同抽头或音调。 建议两种方法用于确定用于通信系统的信道估计的时间平均滤波器，而无需SNR，信道多普勒和衰落统计信息。 第一种方法包括一组不同的滤波器，每个滤波器在一定范围的SNR和多普勒中被调整为最佳。 对于频域中的每个音调（或在时域中敲击），第一种方法选择一组过滤器，以使特定的计算度量最小化。 第二种方法使用经验确定的二阶统计量，在每个音调（或抽头）处直接计算最小二乘法中的“最佳”滤波器。

公开(公告)号：AU2014361879A1

公开(公告)日：2016-05-19

申请号：AU2014361879

申请日：2014-11-14

Applicant: QUALCOMM INC

Inventor： LIN YIH-HAO ,  LIU RUOHENG ,  NAMGOONG JUNE ,  JAYARAMAN SRIKANT

IPC: H04L5/00 ,  H04B7/185 ,  H04W84/04 ,  H04W88/04

Abstract: The connection management entity apparatus determines a set of modems within coverage of a particular area. Each modem of the set of modems is associated with a particular aircraft and one carrier of a plurality of carriers. The apparatus allocates subsets of modems to each eNB of a set of eNBs. The allocation allows each eNB to communicate with the allocated subset of modems. Each eNB operates on a different carrier. The apparatus may be a eNB. The eNB determines a set of modems within coverage of the eNB. The set of modems is associated with one carrier of a plurality of carriers. The eNB operates on the one carrier. Each modem in the set of modems is associated with a different aircraft. The eNB sends information indicating the set of modems and receives an allocation of a second set of modems in response to the sent information.

公开(公告)号：CA2525239C

公开(公告)日：2013-01-08

申请号：CA2525239

申请日：2005-01-20

Applicant: QUALCOMM INC

Inventor： GROB MATTHEW S ,  BLACK PETER J ,  JAYARAMAN SRIKANT ,  JACOBS PAUL E

IPC: H04B7/26 ,  H04L5/02 ,  H04L27/26

Abstract: Synchronized broadcast transmits a same broadcast content using a same waveform from multiple transmitters. Transmitters each apply a same spreading code for broadcast transmissions. In a spread-spectrum communication system having a time division multiplexed forward link, a synchronized broadcast transmission is inserted into a broadcast slot. One embodiment employs an Orthogonal Frequency Divisional Multiplex (OFDM) waveform for the synchronized broadcast. An OFDM receiver is then used to process the received synchronized broadcast transmission. An alternate embodiment implements a broadcast Pseudo-random Noise (PN) code for use by multiple transmitters. An equalizer is then employed to estimate the synchronized broadcast transmission.

公开(公告)号：UA95437C2

公开(公告)日：2011-08-10

申请号：UAA200600446

申请日：2005-01-20

Applicant: QUALCOMM INC

Inventor： GROB MATTEW S ,  BLACK PETER J ,  JAYARAMAN SRIKANT ,  JACOBS PAUL E

IPC: H04B7/26 ,  H04L5/02 ,  H04L27/26

Abstract: Присинхронизированномшироковещаниипередаютоднои тожешироковещательноесодержимое, используясигналыоднойи тойжеформыотмногочисленныхпередатчиков. Каждыйизпередатчиковприменяеттотжекодрасширенияспектрадляшироковещательныхпередач. Всистемесвязис расширениемспектра, которыйимеетпрямуюлиниюсвязи, мультиплексированнуюс временнымразделениемсигналов, синхронизированнуюшироковещательнуюпередачувставляютв слотшироковещания. Одинизвариантовосуществленияиспользуетсигналымультиплексированияс ортогональнымчастотнымразделениемсигналов (OFDM) длясинхронизированногошироковещания. Приемник OFDM потомиспользуютдляобработкипринятойсинхронизированнойшироковещательнойпередачи. Д�

公开(公告)号：DE60336863D1

公开(公告)日：2011-06-01

申请号：DE60336863

申请日：2003-07-18

Applicant: QUALCOMM INC

Inventor： JAYARAMAN SRIKANT ,  FERNANDEZ CORBATON IVAN JESUS ,  SMEE JOHN E

IPC: H04L25/03 ,  H04L27/01 ,  H04B7/005 ,  H04L25/00

公开(公告)号：AT507639T

公开(公告)日：2011-05-15

申请号：AT03765773

申请日：2003-07-18

Applicant: QUALCOMM INC

Inventor： JAYARAMAN SRIKANT ,  FERNANDEZ CORBATON IVAN JESUS ,  SMEE JOHN

IPC: H04L25/03 ,  H04L27/01 ,  H04B7/005 ,  H04L25/00

Abstract: A method and apparatus for a decision feedback equalizer wherein a correction term is used to compensate for slicer errors, thus avoiding error propagation. Filter coefficients for the equalizer are selected so as to minimize a cost function for the equalizer, including a correction term as a function of the energy of the filter coefficients. The equalizer includes a coefficient generator responsive to the correction term. One embodiment estimates a transmitted symbol from a received sample as a function of Signal-to-Interference and Noise Ratio (SINR) of the received sample. The received sample is quantized and mapped to a region of a grid overlaid on the transmitted symbol constellation. The region may correspond to a symbol estimate value or may be processed further to obtain a symbol estimate value.

公开(公告)号：ES2348415T3

公开(公告)日：2010-12-03

申请号：ES05711606

申请日：2005-01-20

Applicant: QUALCOMM INC

Inventor： BLACK PETER J ,  JACOBS PAUL E ,  GROB MATTHEW S ,  JAYARAMAN SRIKANT

IPC: H04B7/26 ,  H04L5/02 ,  H04L27/26

Abstract: - Un método para la transmisión de difusión sincronizada en un sistema (5, 7, 25, 55; 240) de comunicación de espectro disperso, comprendiendo el sistema de comunicación de espectro disperso al menos unos transmisores (5, 7; 240) primero y segundo, comprendiendo el método: dispersar (250), mediante el primer transmisor, una primera información con un primer código de dispersión específico para el primer transmisor (240), siendo la primera información información de unidifusión; y dispersar (245) de manera sincronizada en el tiempo, mediante los transmisores al menos primero y segundo, información de difusión con un código de dispersión de difusión común a los transmisores al menos primero y segundo, en donde la información de difusión es la misma para los transmisores al menos primero y segundo; y transmitir la información de difusión desde los transmisores al menos primero y segundo de una manera sincronizada en el tiempo.