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1. 发明授权

US08699465B2 Forward link data rate control and rate indication for satellite-enabled communications systems 有权
标题翻译：用于卫星通信系统的前向链路数据速率控制和速率指示
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。

2. 发明授权

US07983325B2 Decoding of the overhead channels of the geosynchronous (GEO) satellite reverse link 有权
标题翻译：地球同步（GEO）卫星反向链路的开销信道的解码
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。

3. 发明申请

US20110128867A1 FORWARD LINK DATA RATE CONTROL AND RATE INDICATION FOR SATELLITE-ENABLED COMMUNICATIONS SYSTEMS 有权
标题翻译：用于卫星通信系统的前向链路数据速率控制和速率指示
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。

4. 发明申请

US20080025249A1 1xEVDO WIRELESS INTERFACE TO ENABLE COMMUNICATIONS VIA A SATELLITE RELAY 审中-公开
标题翻译： 1xEVDO无线接口通过卫星继电器启用通信
公开(公告)号：US20080025249A1
公开(公告)日：2008-01-31
申请号：US11829869
申请日：2007-07-27
申请人： Kalyan Kuppuswamy , June Namgoong , Srikant Jayaraman , Ahmad Jalali
发明人： Kalyan Kuppuswamy , June Namgoong , Srikant Jayaraman , Ahmad Jalali
IPC分类号： H04B7/204
CPC分类号： H04B7/18567
摘要： A communication system is provided that allows a mobile terminal with an EVDO interface to perform VoIP communications via a satellite. The 1xEVDO physical layer frames and vocoder frames are synchronized and aligned to a known periodic time boundary for efficient transmission. A reverse link transmission rate is adjusted to match a VoIP packet source rate and operate the reverse link transmission channel to a satellite continuously. The reverse link transmission channel from a mobile terminal to a satellite may operate continuously and at a lower channel transmission rate to reduce the peak power amplifier power requirement. The higher layer time-out periods are increased to account for propagation delay to/from a satellite relay. A physical layer retransmit mechanism is disabled to ignore ACKs/NACKs when sending VoIP packets via a satellite relay. A different channel code may be selective applied depending on the size/type of packets being transmitted.
摘要翻译：提供一种通信系统，其允许具有EVDO接口的移动终端经由卫星执行VoIP通信。 1xEVDO物理层帧和声码器帧被同步并对齐到已知的周期时间边界以进行有效传输。调整反向链路传输速率以匹配VoIP分组源速率并且连续地向卫星操作反向链路传输信道。从移动终端到卫星的反向链路传输信道可以连续地以较低的信道传输速率工作，以降低峰值功率放大器的功率需求。更高层的超时周期被增加以考虑到/从卫星中继的传播延迟。当通过卫星中继发送VoIP分组时，物理层重传机制被禁止忽略ACK / NACK。根据发送的分组的大小/类型，可以选择性地应用不同的信道码。

5. 发明申请

US20080025312A1 ZERO-HEADER COMPRESSION FOR IMPROVED COMMUNICATIONS 审中-公开
标题翻译：用于改进通信的零压头压缩
公开(公告)号：US20080025312A1
公开(公告)日：2008-01-31
申请号：US11829871
申请日：2007-07-27
申请人： Kalyan Kuppuswamy , June Namgoong , Srikant Jayaraman , Ahmad Jalali , Rohit Kapoor
发明人： Kalyan Kuppuswamy , June Namgoong , Srikant Jayaraman , Ahmad Jalali , Rohit Kapoor
IPC分类号： H04L12/56
CPC分类号： H04W28/06 , H04L69/04 , H04L69/22 , H04W84/06
摘要： A communication system is disclosed in which a mobile terminal having limited power is able to communicate with a land-based network via a low-rate satellite communication link. To achieve VoIP communications via a low-rate link, link-layer assisted zero-header header compression techniques are employed to reduce VoIP packet overheads. Additionally, overheads introduced by link layer protocol layers are eliminated or reduced. A transmitting device strips RTP/UDP/IP header information from a stream of VoIP packets. The transmitting device then sends an initial context message providing the RTP/UDP/IP header information. The stripped zero-header VoIP packets are then transmitted via a satellite relay. A receiving device uses the initial context information to reconstruct the headers for the zero-header VoIP packets.
摘要翻译：公开了一种通信系统，其中具有有限功率的移动终端能够经由低速率卫星通信链路与陆基网络进行通信。为了通过低速率链路实现VoIP通信，采用链路层辅助的零标题报头压缩技术来减少VoIP分组开销。此外，消除或减少了由链路层协议层引入的开销。发送设备从VoIP数据包流中剥离RTP / UDP / IP头信息。然后，发送设备发送提供RTP / UDP / IP报头信息的初始上下文消息。然后通过卫星中继传输剥离的零标题VoIP数据包。接收设备使用初始上下文信息来重构零标题VoIP分组的报头。

6. 发明授权

US08126072B2 Noise variance estimation in wireless communications for diversity combining and log likelihood scaling 有权
标题翻译：用于分集组合和对数似然度比例的无线通信中的噪声方差估计
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。

7. 发明授权

US07564775B2 Timing control in orthogonal frequency division multiplex systems based on effective signal-to-noise ratio 失效
标题翻译：基于有效信噪比的正交频分复用系统中的定时控制
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。

8. 发明申请

US20080101506A1 RECEIVER FOR THE GEO SATELLITE REVERSE LINK USING TAIL-BITING CODE 有权
标题翻译：使用尾巴定位代码接收GEO卫星反向链接
公开(公告)号：US20080101506A1
公开(公告)日：2008-05-01
申请号：US11933376
申请日：2007-10-31
申请人： Srikant Jayaraman , June Namgoong
发明人： Srikant Jayaraman , June Namgoong
IPC分类号： H03D1/00 , H04L27/06
CPC分类号： H04L25/025 , H03M13/413 , H03M13/6337 , H04L1/005 , H04L1/0054 , H04L1/0059 , H04L25/0228 , H04L25/0238 , H04L27/233 , H04L2027/003
摘要： A receiver for the GEO satellite reverse link, which uses the tail-biting convolutional code for error control, and methods to solve the problem of channel estimation is described. The channel estimate is initialized at each state using the pilot channel. Branch metric computation is used for circular decoding of the tail-biting convolutional code. The technique is effective when partial tail-biting is implemented.
摘要翻译：描述了用于GEO卫星反向链路的接收机，其使用尾巴卷积码进行错误控制，并且描述了解决信道估计问题的方法。使用导频信道在每个状态下初始化信道估计。分支度量计算用于尾部卷积码的循环解码。当实施部分尾巴时，该技术是有效的。

9. 发明申请

US20060062322A1 Noise variance estimation in wireless communications for diversity combining and log-likelihood scaling 失效
标题翻译：无线通信中的噪声方差估计用于分集组合和对数似然度比例
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。

10. 发明授权

US08588086B2 Reverse link data rate indication for satellite-enabled communications systems 有权
标题翻译：支持卫星通信系统的反向链路数据速率指示
公开(公告)号：US08588086B2
公开(公告)日：2013-11-19
申请号：US12627946
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： G01R31/08 , H04B1/00 , H04B1/38 , H04B7/15 , H04L5/16
CPC分类号： H04L1/0025 , H04L1/0075
摘要： Reverse link data rate indications in wireless communication systems are defined with low identification overhead. Existence of a pilot signal is leveraged in order to reduce the overhead for identifying and selecting the reverse link data rate. At least two distinguishable pilot signals are defined, in which, based on the particular pilot signal present in the transmitted frame, at least one rate set from the multiple available rate sets can be determined. Reverse rate information in the transmitted frame is then used to identify which specific data rate within the determined rate set is used. Based on the identified data rate, the receiver may then decode the payload data in the transmitted frame.
摘要翻译：无线通信系统中的反向链路数据速率指示被定义为具有低的识别开销。利用导频信号的存在以减少用于识别和选择反向链路数据速率的开销。定义了至少两个可区分的导频信号，其中基于发送帧中存在的特定导频信号，可以确定从多个可用速率集合设置的至少一个速率。然后使用发送帧中的反向速率信息来识别确定的速率集合内的哪个特定数据速率。基于所识别的数据速率，接收机然后可以对传输帧中的有效载荷数据进行解码。

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