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1. 发明申请

WO2008014520A3 IMPROVEMENTS TO A WIRELESS INTERFACE TO ENABLE COMMUNICATIONS VIA A SATELLITE RELAY 审中-公开
标题翻译：改善无线接口，通过卫星接收器实现通信
公开(公告)号：WO2008014520A3
公开(公告)日：2008-03-20
申请号：PCT/US2007074767
申请日：2007-07-30
申请人： QUALCOMM INC , KUPPUSWAMY KALYAN , NAMGOONG JUNE , JAYARAMAN SRIKANT , JALALI AHMAD
发明人： KUPPUSWAMY KALYAN , NAMGOONG JUNE , JAYARAMAN SRIKANT , JALALI AHMAD
IPC分类号： H04L29/06 , H04B7/185
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。

2. 发明申请

WO2008130443A3 : ML DECODING OF CODEWORDS WITH PARTIAL CHANNEL INFORMATION IN A GEO SATELLITE REVERSE LINK 审中-公开
标题翻译：：在地球环境卫星反向链路中解码部分信道的编码
公开(公告)号：WO2008130443A3
公开(公告)日：2009-05-14
申请号：PCT/US2007083242
申请日：2007-10-31
申请人： QUALCOMM INC , JAYARAMAN SRIKANT , NAMGOONG JUNE
发明人： JAYARAMAN SRIKANT , NAMGOONG JUNE
IPC分类号： H04L25/02 , H04J11/00
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 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 (111). Pilot symbols are extracted from a pilot signal (114) and a channel estimate is made from the pilot signal (115). Codewords in the set of valid codewords are correlated (112) and the channel estimate is used to form a set of metries (123) and the codeword corresponding to the maximum metric is selected (135).
摘要翻译：使用功率有效的技术来解调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从从导频信号提取的码字实现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（111）。从导频信号（114）提取导频符号，并且从导频信号（115）进行信道估计。所述有效码字集合中的码字被相关（112），并且信道估计被用于形成一组信元（123），并且选择与最大度量对应的码字（135）。

3. 发明申请

WO2008055207A3 RECIEVER FOR THE GEO SATELLITE REVERSE LINK USING TAIL-BITING CODE 审中-公开
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：WO2008055207A3
公开(公告)日：2008-09-04
申请号：PCT/US2007083173
申请日：2007-10-31
申请人： QUALCOMM INC , JAYARAMAN SRIKANT , NAMGOONG JUNE
发明人： JAYARAMAN SRIKANT , NAMGOONG JUNE
IPC分类号： H04L25/02
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GEO卫星反向链路的接收机，其使用尾巴卷积码进行误差控制，并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。

4. 发明申请

WO2007024934A3 CHANNEL ESTIMATION IN COMMUNICATION SYSTEM 审中-公开
标题翻译：通信系统中的信道估计
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
申请人： QUALCOMM INC , JAYARAMAN SRIKANT , NAMGOONG JUNE
发明人： JAYARAMAN SRIKANT , NAMGOONG JUNE
IPC分类号： H04L25/02
CPC分类号： H04L25/0232 , H04L25/0222 , H04L27/2647
摘要： 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.
摘要翻译：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。

5. 发明申请

WO2014200747A3 ULTRA-WIDEBAND RANGING WAVEFORM 审中-公开
标题翻译：超宽带范围波形
公开(公告)号：WO2014200747A3
公开(公告)日：2015-02-12
申请号：PCT/US2014040478
申请日：2014-06-02
申请人： QUALCOMM INC
发明人： NAMGOONG JUNE , JAYARAMAN SRIKANT
IPC分类号： G01S5/02
CPC分类号： G01S3/04 , G01S5/0226
摘要： Methods, systems, devices, and apparatuses are described for location tracking in which each tag used to track an asset or person in an indoor environment transmits ranging waveforms used to estimate a location of the tag. Multiple tags may concurrently transmit without interfering with each other by having each tag use a distinct frequency shift for the ranging waveforms. Access points may be deployed throughout the indoor environment as part of a wireless network (e.g., ultra-wideband or UWB network) that tracks the assets. The access points may receive the ranging waveforms transmitted by the tags and may perform measurements based on the ranging waveforms. The measurements may be sent to a tracking management server to estimate the location of the tags. The server may also determine and assign the distinct frequency shifts used by the tags and may modify the assignment when the number of tags being tracked changes.
摘要翻译：描述用于位置跟踪的方法，系统，设备和装置，其中用于跟踪室内环境中的资产或人员的每个标签传输用于估计标签位置的测距波形。通过使每个标签对测距波形使用不同的频移，多个标签可以同时发送而不干扰彼此。接入点可以在整个室内环境中部署，作为跟踪资产的无线网络（例如，超宽带或UWB网络）的一部分。接入点可以接收由标签发送的测距波形，并且可以基于测距波形执行测量。测量可以发送到跟踪管理服务器以估计标签的位置。服务器还可以确定并分配标签使用的不同频率偏移，并且当跟踪的标签的数量改变时可以修改分配。

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