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21. 发明授权

US11632194B2 System and method for satellite communication in a helicopter 有权
公开(公告)号：US11632194B2
公开(公告)日：2023-04-18
申请号：US17370936
申请日：2021-07-08
申请人： James Jehong Jong , Channasandra Ravishankar , William Whitmarsh
发明人： James Jehong Jong , Channasandra Ravishankar , William Whitmarsh
IPC分类号： H04L1/18 , H04L1/00 , H04L5/00 , H04L25/03 , H04L1/1812
摘要： A receiver and a method for receiving a radio communication is disclosed. The method includes receiving a burst encoded with a robust modulation coding scheme (MCS) as RX signals; generating, for each of the RX signals, a burst SNR, soft decision symbols and a packet; weighing, each of soft decision symbols with a respective burst SNR, to calculate soft combined symbols that are used to generate a Maximal-Ratio Combining (MRC) packet; and selecting, from the packets and the MRC packet, a CRC passed packet as an output. An adaptive dual burst transmitter is disclosed.

22. 发明授权

US11223666B2 Method and system of providing second generation (2G) voice services over Internet protocol 有权
公开(公告)号：US11223666B2
公开(公告)日：2022-01-11
申请号：US16694106
申请日：2019-11-25
申请人： Channasandra Ravishankar , Gaguk Zakaria
发明人： Channasandra Ravishankar , Gaguk Zakaria
IPC分类号： H04L29/06 , H04W84/06 , H04W88/16 , H04W92/14 , H04W92/06 , H04W92/02 , H04L12/66
摘要： A system to provide second generation (2G) voice services over internet protocol, the system including: a voice gateway (VGW) including a 2G stack to communicate control plane information and user plane information with a 2G user terminal (UT) via a circuit-switched network without modifications to the 2G-UT, an Iu-CS IP stack, and a relay to map the control plane information between the 2G stack and the Iu-CS IP stack, and vice-versa; a mobile switching center (MSC), connected to the VGW via the Iu-CS IP stack, to manage and establish the voice services between the 2G-UT and a public switched telephone network (PSTN) based on the mapped control plane information; and a media gateway (MGW) connected to the VGW via the Iu-CS IP stack, where the MGW communicates the user plane information between the 2G-UT and the PSTN after the MSC 2-G UT vocoder, e.g. AMBE, has established voice services.

23. 发明申请

US20210028553A1 WIDE FREQUENCY RANGE DUAL POLARIZED RADIATING ELEMENT WITH INTEGRATED RADOME 有权
公开(公告)号：US20210028553A1
公开(公告)日：2021-01-28
申请号：US16716026
申请日：2019-12-16
申请人： Michael Buckley , Channasandra Ravishankar
发明人： Michael Buckley , Channasandra Ravishankar
IPC分类号： H01Q21/00 , H01Q1/42 , H01Q21/24
摘要： A low-profile array and a low-profile radiating element including: a stripline feed layer; a High Order Floquet (HOFS) part layer; and a radome layer in direct contact with the HOFS part layer, where the HOFS part layer is disposed between the stripline feed layer and the radome layer, and the radome layer includes a high dielectric constant (dk) environmentally robust material.

24. 发明授权

US10840999B2 System and method for networked scheduling for improved spectral efficiency 有权
公开(公告)号：US10840999B2
公开(公告)日：2020-11-17
申请号：US15832981
申请日：2017-12-06
申请人： Channasandra Ravishankar , Xiaoling Huang , Nassir Benammar , Rajeev Gopal , John Corrigan
发明人： Channasandra Ravishankar , Xiaoling Huang , Nassir Benammar , Rajeev Gopal , John Corrigan
IPC分类号： H04L27/28 , H04B7/185 , H04L29/06 , H04W52/26 , H04W84/06 , H04W72/08 , H04W72/12 , H04W52/34
CPC分类号： H04B7/18519 , H04B7/18517 , H04B7/18526 , H04B7/18584 , H04L29/06224 , H04W52/262 , H04W52/346 , H04W72/085 , H04W72/1231 , H04W84/06
摘要： A method for networked scheduling is disclosed. The method includes: providing a gateway; a plurality of channels assigned to a color reuse scheme including colors, wherein some of the plurality of channels assigned to one of the colors comprise a set of co-channels; associating the set of co-channels with the gateway; generating a traffic pattern for the set of co-channels for an upcoming allocation slot; determining a channel state of each co-channel in the set of co-channels per the traffic pattern; and setting a Modulation and Coding scheme (MODCOD) of each co-channel in the set of co-channels based on the respective channel state.

25. 发明授权

US10826596B2 Placement of calibration earth stations for ground based beam forming in a satellite system 有权
公开(公告)号：US10826596B2
公开(公告)日：2020-11-03
申请号：US15902784
申请日：2018-02-22
申请人： Yash Vasavada , Channasandra Ravishankar , John Corrigan , Gaguk Zakaria , Xiaoling Huang
发明人： Yash Vasavada , Channasandra Ravishankar , John Corrigan , Gaguk Zakaria , Xiaoling Huang
IPC分类号： H04B7/185 , H04B7/204 , H01Q25/00
摘要： A system and method for estimating calibration parameters and locating a Calibration Earth Station (CES) is described. The method may be performed offline. The method includes: providing L×M pilot signal measurements in a matrix R from L CESs and the M feed elements, wherein the matrix R comprises a set of channel coefficients c={c1, c2, . . . , cM}, and k={k1, k2, . . . , kL} perturbations; linking a subset of channel coefficients {c1, c2, . . . , cM} using each of the L CESs; and estimating a relative estimate of the k={k1, k2, . . . , kL} pertubations across the L CESs by using each of the L CESs as a bridging element. In the method, the bridging element provides a strong pilot signal for at least two of the L CESs. A set of criteria for determining locations of CESs have been described. A set of desirable properties for the solution set of L CESs have been disclosed. A combination of inner loop and outer loop methods for determining the final set of optimal locations have been described.

26. 发明授权

US10321356B2 System and method for performing retransmission of a packet 有权
公开(公告)号：US10321356B2
公开(公告)日：2019-06-11
申请号：US15722827
申请日：2017-10-02
申请人： Nassir Benammar , Channasandra Ravishankar
发明人： Nassir Benammar , Channasandra Ravishankar
IPC分类号： H04W28/02 , H04W28/04 , H04L1/18 , H04L1/00
摘要： A method for reducing retransmission of packets by a sender is disclosed. The method includes: providing a network comprising a physical layer, a medium access control (MAC) layer and an Radio Link Control (RLC) layer; providing a retransmission packet in the physical layer, wherein the retransmission packet comprises a flow having a reordering feature in the RLC layer; enabling Hybrid Automatic Repeat reQuest (HARQ) in the physical layer and the MAC layer; receiving a HARQ request for a retransmission; and transmitting a new packet with the physical layer in response to the HARQ request, when the reordering feature for the flow in the retransmission packet is disabled.

27. 发明授权

US06980800B2 System and method for providing contention channel organization for broadband satellite access in a communications network 有权
标题翻译：在通信网络中为宽带卫星接入提供竞争信道组织的系统和方法
公开(公告)号：US06980800B2
公开(公告)日：2005-12-27
申请号：US10074759
申请日：2002-02-12
申请人： Anthony Noerpel , Channasandra Ravishankar , Xiaoping He , Abheek Saha
发明人： Anthony Noerpel , Channasandra Ravishankar , Xiaoping He , Abheek Saha
IPC分类号： H04W74/08 , H04Q7/20 , H04B7/212
CPC分类号： H04W74/0833
摘要： Two types of contention channels are used to accommodate broadband packet data in a satellite communication network. A first contention channel is used by unsynchronized user terminals to access the system and request a traffic channel. The first contention channel is of a sufficient duration to accommodate a RACH message, as well as the timing uncertainty between user terminals within a given spot beam. A second contention channel is shorter in duration than the first contention channel, and is narrowband, so that more than one second contention channel may be transmitted within the bandwidth of the broadband traffic channels. The second contention channels are used by synchronized user terminals for transmitting packet RACH, or PRACH, messages. The more efficient nature of the PRACH channels accommodates the increased overhead associated with bursty packet data, without the capacity cost of the longer duration RACH channel.
摘要翻译：两种类型的竞争通道用于在卫星通信网络中容纳宽带分组数据。不同步的用户终端使用第一争用通道访问系统并请求业务信道。第一争用信道具有足够的持续时间以适应RACH消息，以及在给定点波束内的用户终端之间的定时不确定性。第二争用信道的持续时间比第一竞争信道短，并且是窄带，使得可以在宽带业务信道的带宽内传输多于一个的第二争用信道。第二争用信道由同步用户终端用于发送分组RACH或PRACH消息。 PRACH信道的更高效的性质适应与突发分组数据相关联的增加的开销，而不需要较长持续时间的RACH信道的容量成本。

28. 发明申请

US20050013309A1 System and method for high quality video conferencing with heterogeneous end-points and networks 审中-公开
标题翻译：具有异构端点和网络的高质量视频会议系统和方法
公开(公告)号：US20050013309A1
公开(公告)日：2005-01-20
申请号：US10870637
申请日：2004-06-17
申请人： Channasandra Ravishankar , Surekha Peri
发明人： Channasandra Ravishankar , Surekha Peri
IPC分类号： H04L12/18 , H04N7/15 , H04L12/28
CPC分类号： H04L12/1827 , H04L65/1009 , H04L65/4038 , H04N7/152
摘要： The invention relates to improving the quality of media data in video conferences having end-points with heterogeneous capability sets. Transmission modes are negotiated based on the highest capability codecs supported by each respective end-point. Each end-point communicates data based on its individually negotiated transmission mode. Data translations are implemented as necessary to ensure that each end-point receives media data according to a transmission mode that it supports. Accordingly, all end-points in a multi-point video conference employ their most capable codecs, thereby greatly enhancing the overall media quality in multi-point video conferences having heterogeneous end-points.
摘要翻译：本发明涉及提高具有异构能力集的端点的视频会议中媒体数据的质量。基于每个相应端点支持的最高能力编解码器来协商传输模式。每个端点根据其单独协商的传输模式传送数据。必要时实现数据转换，以确保每个端点根据其支持的传输模式接收媒体数据。因此，多点视频会议中的所有端点都使用其最有能力的编解码器，从而大大增强了具有异构端点的多点视频会议的整体媒体质量。

29. 发明授权

US06269333B1 Codebook population using centroid pairs 失效
标题翻译：码本人口使用质心对
公开(公告)号：US06269333B1
公开(公告)日：2001-07-31
申请号：US09649094
申请日：2000-08-28
申请人： Channasandra Ravishankar
发明人： Channasandra Ravishankar
IPC分类号： G10L1914
CPC分类号： G10L19/038 , G10L19/07
摘要： First and second codeword are selected from respective first and second codebooks having an equal number of codewords and wherein the first and second codewords represent unequal numbers of elements of respective first and second sub-vectors. A codebook populating method for a split vector quantizer relies on comparing centroid calculations for the first codebook. The calculations are performed on eligible pairs of codewords. Eligible codewords are limited to those which satisfy and ordered property based on Line Spectrum Frequencies (LSF). The results of the centroid pair codeword calculations are used to populate the second codebook.
摘要翻译：从相应数量的码字的相应的第一和第二码本中选择第一和第二码字，并且其中第一和第二码字表示相应的第一和第二子向量的不等数目的元素。用于分割矢量量化器的码本填充方法依赖于比较第一码本的质心计算。在合格的码字对上执行计算。合格码字被限制为基于线频谱（LSF）满足和排序属性的码字。质心对码字计算的结果用于填充第二码本。

30. 发明授权

US6134520A Split vector quantization using unequal subvectors 失效
标题翻译：使用不等分子矢量分解矢量量化
公开(公告)号：US6134520A
公开(公告)日：2000-10-17
申请号：US578441
申请日：1995-12-26
申请人： Channasandra Ravishankar
发明人： Channasandra Ravishankar
IPC分类号： G10L19/02 , G10L19/06 , G10L5/00
CPC分类号： G10L19/038 , G10L19/07
摘要： A 1200 b/s vocoder providing a high degree of speech intelligibility and natural voice quality includes a tenth-order linear prediction analyzer, a split vector quantizer for line spectral frequencies, circuitry providing voicing classification and pitch estimation, a differential pitch and gain quantizer and a multiplexer for producing an encoded word transmitted to a receptive demultiplexer. The vocoder provides a characteristic encoded word including a first codeword, a second codeword, a pitch codeword and a gain codeword, wherein the first and second codewords are selected from respective first and second codebooks having a equal number of codewords and wherein the first and second codewords represent unequal numbers of elements of respective first and second sub-vectors. A codebook populating method for a split vector quantizer vocoder is also utilized.
摘要翻译：提供高度语音清晰度和自然语音质量的1200b / s声码器包括十阶线性预测分析器，用于线谱频率的分割向量量化器，提供语音分类和音调估计的电路，差分音调和增益量化器，以及多路复用器，用于产生被发送到接收解复用器的编码字。声码器提供包括第一码字，第二码字，音调码字和增益码字的特征编码字，其中从相应数量的码字的相应第一和第二码本中选择第一和第二码字，其中第一和第二码字码字表示相应的第一和第二子向量的不等数量的元素。还使用用于分割矢量量化器声码器的码本填充方法。

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