公开(公告)号：US08126072B2

公开(公告)日：2012-02-28

申请号：US12491056

申请日：2009-06-24

申请人： June Namgoong ,  Hao Xu ,  Peter J. Black ,  Srikant Jayaraman

发明人： June Namgoong ,  Hao Xu ,  Peter J. Black ,  Srikant Jayaraman

IPC分类号： H04L27/28

CPC分类号： H04L1/20 ,  H04B1/1027 ,  H04L27/2647

摘要： The present patent application comprises a method and means for demodulating symbols, comprising converting an OFDM symbol from a time domain to a frequency domain, selecting pilot tones, making a soft decision based on received data, and estimating a channel frequency response. In another example, the method and means further comprises selecting guard tones. In another example, the method and means further comprises generating channel estimates for in-band and band-edge pilot tones.

摘要翻译： 本专利申请包括用于解调符号的方法和装置，包括将OFDM符号从时域转换到频域，选择导频音，基于接收到的数据进行软判决，以及估计信道频率响应。 在另一示例中，该方法和装置还包括选择保护音。 在另一示例中，该方法和装置还包括生成带内和带边导频音调的信道估计。

公开(公告)号：US07564775B2

公开(公告)日：2009-07-21

申请号：US11119240

申请日：2005-04-29

申请人： Srikant Jayaraman ,  Hao Xu ,  June Namgoong ,  Michael John Mangan ,  Peter J. Black

发明人： Srikant Jayaraman ,  Hao Xu ,  June Namgoong ,  Michael John Mangan ,  Peter J. Black

IPC分类号： H04J11/00

CPC分类号： H04L27/2662 ,  H04L1/20 ,  H04L5/0048 ,  H04L27/2695 ,  H04L2001/0093

摘要： A spread-spectrum communication system provides an effective signal-to-noise ratio (SNR) of received orthogonal frequency division multiplex (OFDM) slots in the presence of timing errors. Effective SNR can serve as a diagnostic tool for determining whether there was a timing error when a measured packet error rate (PER) remains high, and a predicted PER from the effective SNR remains low. A loop can use the effective SNR to control a time reference used by an OFDM decoder.

摘要翻译： 在存在定时误差的情况下，扩频通信系统提供接收到的正交频分复用（OFDM）时隙的有效信噪比（SNR）。 当测量的分组错误率（PER）保持为高时，有效SNR可以用作确定是否存在定时误差的诊断工具，并且来自有效SNR的预测的PER保持为低。 循环可以使用有效SNR来控制OFDM解码器使用的时间参考。

公开(公告)号：US07672383B2

公开(公告)日：2010-03-02

申请号：US11047347

申请日：2005-01-28

申请人： June Namgoong ,  Hao Xu ,  Peter J. Black ,  Srikant Jayaraman

发明人： June Namgoong ,  Hao Xu ,  Peter J. Black ,  Srikant Jayaraman

IPC分类号： H04L27/28

CPC分类号： H04L1/20 ,  H04B1/1027 ,  H04L27/2647

摘要： Noise variance estimation in wireless communications. Noise variance estimation includes receiving a signal including an OFDM symbol having, in-band tones including in-band pilot tones, and band-edge tones including band-edge pilot tones and guard tones, estimating an effective noise variance for the in-band tones using the in-band pilot tones and channel estimates for the in-band pilot tones, and estimating an effective noise variance for the band-edge tones using the band-edge pilot tones, channel estimates for the band-edge pilot tones, and the guard tones.

摘要翻译： 无线通信中的噪声方差估计。 噪声方差估计包括接收包括具有包括带内导频音频的带内音调和包括带边导频音和保护音的带边音调的OFDM符号的信号，估计带内音调的有效噪声方差 使用带内导频音调和频带内导频音调的估计，以及使用带边导频音估计带边音调的有效噪声方差，对带边导频音进行信道估计，以及 守卫色调。

公开(公告)号：US07149264B2

公开(公告)日：2006-12-12

申请号：US11102301

申请日：2005-04-08

申请人： Peter J. Black ,  Hao Xu ,  June Namgoong ,  Srikant Jayaraman

发明人： Peter J. Black ,  Hao Xu ,  June Namgoong ,  Srikant Jayaraman

IPC分类号： H04B1/10

CPC分类号： H04L25/0204 ,  H04L25/0216 ,  H04L25/0234

摘要： A pilot assisted channel estimation process. A receiver may be configured to estimate the impulse response of a channel from a signal having pilot tones and spread-spectrum pilot signals. The receiver estimates the response of the channel from the pilot tones, and adapts the length of delay the channel response is estimated based on the spread-spectrum pilot signals.

摘要翻译： 导频辅助信道估计过程。 接收机可以被配置为从具有导频音调和扩频导频信号的信号估计信道的脉冲响应。 接收机从导频音估计信道的响应，并根据扩频导频信号调整估计信道响应的延迟长度。

公开(公告)号：US20060062322A1

公开(公告)日：2006-03-23

申请号：US11047347

申请日：2005-01-28

申请人： June Namgoong ,  Hao Xu ,  Peter Black ,  Srikant Jayaraman

发明人： June Namgoong ,  Hao Xu ,  Peter Black ,  Srikant Jayaraman

IPC分类号： H04B15/00 ,  H04K1/10 ,  H04L27/28

CPC分类号： H04L1/20 ,  H04B1/1027 ,  H04L27/2647

摘要： Noise variance estimation in wireless communications. Noise variance estimation includes receiving a signal including an OFDM symbol having, in-band tones including in-band pilot tones, and band-edge tones including band-edge pilot tones and guard tones, estimating an effective noise variance for the in-band tones using the in-band pilot tones and channel estimates for the in-band pilot tones, and estimating an effective noise variance for the band-edge tones using the band-edge pilot tones, channel estimates for the band-edge pilot tones, and the guard tones.

摘要翻译： 无线通信中的噪声方差估计。 噪声方差估计包括接收包括具有包括带内导频音频的带内音调和包括带边导频音和保护音的带边音调的OFDM符号的信号，估计带内音调的有效噪声方差 使用带内导频音调和频带内导频音调的估计，以及使用带边导频音估计带边音调的有效噪声方差，对带边导频音进行信道估计，以及 守卫色调。

公开(公告)号：US20060245347A1

公开(公告)日：2006-11-02

申请号：US11119240

申请日：2005-04-29

申请人： Srikant Jayaraman ,  Hao Xu ,  June Namgoong ,  Michael Mangan ,  Peter Black

发明人： Srikant Jayaraman ,  Hao Xu ,  June Namgoong ,  Michael Mangan ,  Peter Black

IPC分类号： H04J11/00

CPC分类号： H04L27/2662 ,  H04L1/20 ,  H04L5/0048 ,  H04L27/2695 ,  H04L2001/0093

摘要： A spread-spectrum communication system provides an effective signal-to-noise ratio (SNR) of received orthogonal frequency division multiplex (OFDM) slots in the presence of timing errors. Effective SNR can serve as a diagnostic tool for determining whether there was a timing error when a measured packet error rate (PER) remains high, and a predicted PER from the effective SNR remains low. A loop can use the effective SNR to control a time reference used by an OFDM decoder.

公开(公告)号：US20050276364A1

公开(公告)日：2005-12-15

申请号：US11102301

申请日：2005-04-08

申请人： Peter Black ,  Hao Xu ,  June Namgoong ,  Srikant Jayaraman

发明人： Peter Black ,  Hao Xu ,  June Namgoong ,  Srikant Jayaraman

IPC分类号： H04L25/02 ,  H04L7/00

CPC分类号： H04L25/0204 ,  H04L25/0216 ,  H04L25/0234

摘要： A pilot assisted channel estimation process. A receiver may be configured to estimate the impulse response of a channel from a signal having pilot tones and spread-spectrum pilot signals. The receiver estimates the response of the channel from the pilot tones, and adapts the length of delay the channel response is estimated based on the spread-spectrum pilot signals.

摘要翻译： 导频辅助信道估计过程。 接收机可以被配置为从具有导频音调和扩频导频信号的信号估计信道的脉冲响应。 接收机从导频音估计信道的响应，并根据扩频导频信号调整估计信道响应的延迟长度。

公开(公告)号：US08699465B2

公开(公告)日：2014-04-15

申请号：US12627974

申请日：2009-11-30

申请人： Bin Tian ,  Ahmad Jalali ,  Srikant Jayaraman ,  June Namgoong

发明人： Bin Tian ,  Ahmad Jalali ,  Srikant Jayaraman ,  June Namgoong

IPC分类号： H04W36/30 ,  H04W84/08 ,  H04W74/04

CPC分类号： H04B7/18543 ,  H04L1/0002 ,  H04L1/0026 ,  H04L1/0028 ,  H04L1/08 ,  Y02D50/10

摘要： In a synchronous application to control forward link (FL) data rates in a satellite system, user equipment (UE) repeatedly transmits a quality control measurement (QCM) index during a QCM period. During this QCM period, the data rate cannot change. The associated satellite transmits at a new rate corresponding to the QCM index. The UE knows that it will begin receiving new data at the new rate after a QCM delay. In an asynchronous application, a satellite transmits a rate change signal over a FL rate indication channel (RICH). A UE monitors the FL RICH for this signal. When the signal quality is to be low, the satellite sends only a single bit of the QCM index over a first orthogonal channel. When the signal quality is not low, the satellite transmits each bit of the QCM index in a separate orthogonal channel of the FL RICH.

摘要翻译： 在用于在卫星系统中控制前向链路（FL）数据速率的同步应用中，用户设备（UE）在QCM周期期间重复发送质量控制测量（QCM）索引。 在这个QCM期间，数据速率不能改变。 相关联的卫星以对应于QCM指数的新速率发射。 UE知道在QCM延迟之后，它将以新的速率开始接收新的数据。 在异步应用中，卫星通过FL速率指示信道（RICH）发送速率改变信号。 UE监视该信号的FL RICH。 当信号质量低时，卫星在第一个正交信道上只发送一个QCM索引的比特。 当信号质量不低时，卫星在FL RICH的单独的正交信道中发送QCM索引的每个比特。

公开(公告)号：US07983325B2

公开(公告)日：2011-07-19

申请号：US11933360

申请日：2007-10-31

申请人： Srikant Jayaraman ,  June Namgoong

发明人： Srikant Jayaraman ,  June Namgoong

IPC分类号： H04B1/00

CPC分类号： H04L25/0214 ,  H04B1/7075 ,  H04B2201/70701 ,  H04L25/0236

摘要： A power efficient technique is used to demodulate the coded overhead channels of a geosynchronous (GEO) satellite uplink. A coherent receiver used in a wireless communication system is able to determine the information conveyed in the overhead channel, by effecting channel estimates from codewords extracted from a pilot signal. A valid set of codewords is established. Pilot symbols are extracted from a pilot signal and a channel estimate is made from the pilot signal. Codewords in the set of valid codewords are correlated and a channel phase ambiguity in the signals is removed and a codeword with the largest correlation is chosen. The chosen codeword is used to create a revised channel estimate.

摘要翻译： 使用功率有效的技术来解调地球同步（GEO）卫星上行链路的编码开销信道。 在无线通信系统中使用的相干接收机能够通过对从导频信号提取的码字进行信道估计来确定在开销信道中传送的信息。 建立一组有效的码字。 从导频信号提取导频符号，并根据导频信号进行信道估计。 有效码字集合中的代码字相关，信号中的信道相位模糊度被消除，并且选择具有最大相关性的码字。 所选择的码字用于创建修改的信道估计。

公开(公告)号：US20110128867A1

公开(公告)日：2011-06-02

申请号：US12627974

申请日：2009-11-30

申请人： Bin Tian ,  Ahmad Jalali ,  Srikant Jayaraman ,  June Namgoong

发明人： Bin Tian ,  Ahmad Jalali ,  Srikant Jayaraman ,  June Namgoong

IPC分类号： H04L12/26 ,  H04B7/14

CPC分类号： H04B7/18543 ,  H04L1/0002 ,  H04L1/0026 ,  H04L1/0028 ,  H04L1/08 ,  Y02D50/10

摘要： In a synchronous application to control forward link (FL) data rates in a satellite system, user equipment (UE) repeatedly transmits a quality control measurement (QCM) index during a QCM period. During this QCM period, the data rate cannot change. The associated satellite transmits at a new rate corresponding to the QCM index. The UE knows that it will begin receiving new data at the new rate after a QCM delay. In an asynchronous application, a satellite transmits a rate change signal over a FL rate indication channel (RICH). A UE monitors the FL RICH for this signal. When the signal quality is to be low, the satellite sends only a single bit of the QCM index over a first orthogonal channel. When the signal quality is not low, the satellite transmits each bit of the QCM index in a separate orthogonal channel of the FL RICH.

摘要翻译： 在用于在卫星系统中控制前向链路（FL）数据速率的同步应用中，用户设备（UE）在QCM周期期间重复发送质量控制测量（QCM）索引。 在这个QCM期间，数据速率不能改变。 相关联的卫星以对应于QCM指数的新速率发射。 UE知道在QCM延迟之后，它将以新的速率开始接收新的数据。 在异步应用中，卫星通过FL速率指示信道（RICH）发送速率改变信号。 UE监视该信号的FL RICH。 当信号质量低时，卫星在第一个正交信道上只发送一个QCM索引的比特。 当信号质量不低时，卫星在FL RICH的单独的正交信道中发送QCM索引的每个比特。