公开(公告)号：US07336719B2

公开(公告)日：2008-02-26

申请号：US09999438

申请日：2001-11-28

Applicant: Dhananjay Gore ,  Sumeet Sandhu ,  Shilpa Talwar ,  Arogyaswami J. Paulraj

Inventor： Dhananjay Gore ,  Sumeet Sandhu ,  Shilpa Talwar ,  Arogyaswami J. Paulraj

IPC: H04B7/02

CPC classification number: H04B7/0615 ,  H04L1/0656

Abstract: The present invention provides a diversity transmission system. The diversity transmission system includes a method and system of diversity transmission through a wireless channel formed between multiple transmission antennae of a transceiver and a subscriber unit. The method includes forming a stream of symbols from an incoming data stream. A plurality of the symbols are selected forming a data vector. A maximum delay spread through the wireless channel is determined. The maximum delay spread is generally determined as a multiple of a sample time spacing between elements of the data vector. A plurality of diversity vectors are generated based upon the data vector and the maximum delay spread, each diversity vector includes a plurality of elements. Corresponding elements of the diversity vectors are simultaneously transmitted, each diversity vector transmitted from at least one corresponding antenna of a plurality of spatially separate antennae. This embodiment can further include repeatedly simultaneously transmitting corresponding elements of the diversity vectors until all elements of the diversity vectors have been transmitted, each diversity vector transmitted from at least one corresponding antenna of a plurality of spatially separate antennae.

Abstract translation: 本发明提供一种分集传输系统。 分集传输系统包括通过在收发机的多个发射天线和用户单元之间形成的无线信道的分集传输的方法和系统。 该方法包括从输入数据流形成符号流。 选择形成数据矢量的多个符号。 确定通过无线信道扩展的最大延迟。 最大延迟扩展通常被确定为数据向量的元素之间的采样时间间隔的倍数。 基于数据矢量和最大延迟扩展来生成多个分集向量，每个分集向量包括多个元素。 同时发送分集向量的相应元素，每个分集向量从多个空间分离的天线中的至少一个对应的天线发送。 该实施例还可以包括重复同时发送分集向量的相应元素，直到已经发送了分集向量的所有元素，每个分集向量从多个空间分离的天线中的至少一个对应的天线发送。

公开(公告)号：US07305054B2

公开(公告)日：2007-12-04

申请号：US11319356

申请日：2005-12-27

Applicant: Shilpa Talwar

Inventor： Shilpa Talwar

IPC: H03D1/04 ,  H04L1/02

CPC classification number: H04B7/0842

Abstract: The present invention provides a method and system for receiving a plurality of transmission signals at a receiver, the transmission signals each traveling through a corresponding transmission channel. The receiver includes a plurality of receiver channels, a receiver channel corresponding to each transmission channel. Each receiver channel receives a corresponding transmission signal. The received transmission signals are detected to determine whether the received transmission signals are dominated by noise or interference. If the received transmission signals are dominated by noise, then a first set of weights are selected as a receiver weighting. If the received transmission signals are dominated by interference, then a second set of weights are selected as the receiver weighting. The received transmission signals are estimated based upon the receiver weighting. Detecting whether the received transmission signals are dominated by noise or interference includes determining a level of correlation between the received transmission signals. Detecting whether the received transmission signals are dominated by noise or interference can be determined during a time slot of nulled transmission signals. If the transmission signals are multiple carrier signals, then detecting whether the received transmission signals are dominated by noise or interference can be determined during a frequency and time slot of a nulled carrier of the transmission signals. The first set of weights can be based upon a first covariance matrix, wherein the first covariance matrix represents received noise and interference covariance. The second set of weights can be based upon the second covariance matrix, wherein the second covariance matrix represents interference covariance. The first set of weights and the second set of weights can also be used for transmission mode selection and receiver soft decoding.

Abstract translation: 本发明提供了一种用于在接收机处接收多个传输信号的方法和系统，每个传输信号遍及相应的传输信道。 接收机包括多个接收机信道，对应于每个传输信道的接收机信道。 每个接收机信道接收相应的传输信号。 检测所接收的传输信号以确定所接收的传输信号是否被噪声或干扰所主导。 如果所接收的传输信号由噪声支配，则选择第一组权重作为接收机加权。 如果所接收的传输信号由干扰支配，则选择第二组权重作为接收机加权。 接收到的发送信号是基于接收机加权来估计的。 检测所接收的传输信号是否被噪声或干扰所支配，包括确定所接收的传输信号之间的相关性水平。 检测所接收的传输信号是否被噪声或干扰所支配，可以在无效传输信号的时隙期间确定。 如果发送信号是多个载波信号，则可以在发送信号的无效载波的频率和时隙期间确定接收的发送信号是否被噪声或干扰支配。 第一组权重可以基于第一协方差矩阵，其中第一协方差矩阵表示接收到的噪声和干扰协方差。 第二组权重可以基于第二协方差矩阵，其中第二协方差矩阵表示干涉协方差。 第一组权重和第二组权重也可用于传输模式选择和接收机软解码。

公开(公告)号：US20070223440A1

公开(公告)日：2007-09-27

申请号：US11687393

申请日：2007-03-16

Applicant: Minnie Ho ,  Qinghua Li ,  Xintian Lin ,  Vallabhajosyula Somayazulu ,  Shilpa Talwar

Inventor： Minnie Ho ,  Qinghua Li ,  Xintian Lin ,  Vallabhajosyula Somayazulu ,  Shilpa Talwar

IPC: H04B7/216

CPC classification number: H04W72/042 ,  H04B7/02 ,  H04L5/00 ,  H04W72/0453 ,  H04W72/048 ,  H04W88/08

Abstract: Embodiments of a wireless access network and method for allocation time and frequency resources are generally described herein. Other embodiments may be described and claimed. In some embodiments, a base station allocates contiguous groups of data subcarriers of a downlink subframe to closed-loop user stations, and allocates the remaining data subcarriers of the downlink subframe to open-loop user stations to increase frequency diversity.

Abstract translation: 本文一般地描述用于分配时间和频率资源的无线接入网络和方法的实施例。 可以描述和要求保护其他实施例。 在一些实施例中，基站将下行链路子帧的连续的数据子载波组分配给闭环用户站，并且将下行链路子帧的剩余数据子载波分配给开环用户站以增加频率分集。

公开(公告)号：US06891902B2

公开(公告)日：2005-05-10

申请号：US10189755

申请日：2002-07-02

Applicant: Shilpa Talwar ,  Jose Tellado

Inventor： Shilpa Talwar ,  Jose Tellado

IPC: H04B7/005 ,  H04L27/26 ,  H04L27/34 ,  H04L25/49

CPC classification number: H04W52/52 ,  H04L27/2624 ,  H04L27/3411

Abstract: The invention includes an apparatus and a method for adjusting a power level of a transmission signal for minimal distortion. The method includes modulating the transmission signal. The modulated transmission signal is processed to reduce a peak to average ratio of the modulated transmission signal based upon modulation parameters of the modulated transmission signal. The power level of the modulated transmission signal is adjusted according to the peak to average ratio of the modulated transmission signal. The transmission signal is amplified and transmitted.

Abstract translation: 本发明包括用于调整发送信号的功率电平以便最小失真的装置和方法。 该方法包括调制发送信号。 经调制的发送信号被处理以基于调制的发送信号的调制参数来减小调制的发送信号的峰均比。 调制后的发送信号的功率电平根据调制后的发送信号的峰均比进行调整。 发送信号被放大并发送。