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1. 发明申请

US20060029145A1 Method and apparatus for encoding interleaving and mapping data to facilitate GBPS data rates in wireless systems 有权
标题翻译：用于编码交织和映射数据以便于无线系统中的GBPS数据速率的方法和装置
公开(公告)号：US20060029145A1
公开(公告)日：2006-02-09
申请号：US11114752
申请日：2005-04-25
申请人： Sridhar Rajagopal , Matthew Shoemake , John Terry
发明人： Sridhar Rajagopal , Matthew Shoemake , John Terry
IPC分类号： H04L23/02
CPC分类号： H04L25/4917 , H03M13/2707 , H03M13/4161 , H04L1/0041 , H04L1/0054 , H04L1/006 , H04L1/0069 , H04L1/007 , H04L1/0071 , H04L27/34
摘要： A method and apparatus for encoding data for wireless transmission. The invention includes multi-level coding in which data is partitioned between two encoders, one for encoding Most Significant Bits (MSBs) and the other for encoding Least Significant Bits (LSBs). By partition bits separately for the MSBs and LSBs, the complexity of the decoder may be reduced. The MSBs and LSBs are interleaved such that each MSB is a function of just one LSB, simplifying branch metric selection during Viterbi decoding. This also allows parallel de-interleaving by the receiver, which reduces the interleaving latency of the receiver. A block interleaver jointly optimizes the symbol hamming distance of the symbols and the bit hamming distance of each constituent encoder for the MSBs and LSBs.
摘要翻译：一种用于编码无线传输数据的方法和装置。本发明包括多级编码，其中数据在两个编码器之间分配，一个用于编码最高有效位（MSB），另一个用于编码最低有效位（LSB）。通过分开MSB和LSB的分配位，解码器的复杂度可能会降低。 MSB和LSB被交错，使得每个MSB是仅一个LSB的函数，从而简化维特比解码期间的分支度量选择。这也允许接收机的并行解交织，这降低了接收机的交织等待时间。块交织器共同优化符号的符号汉明距离和每个组成编码器对于MSB和LSB的比特汉明距离。

2. 发明申请

US20060211377A1 Detection and mitigation of interference and jammers in an OFDM system 有权
标题翻译：检测和减轻OFDM系统中的干扰和干扰
公开(公告)号：US20060211377A1
公开(公告)日：2006-09-21
申请号：US11226654
申请日：2005-09-14
申请人： Matthew Shoemake , Sridhar Rajagopal , John Terry
发明人： Matthew Shoemake , Sridhar Rajagopal , John Terry
IPC分类号： H04B17/00
CPC分类号： H04B17/345
摘要： The present invention provides a method and apparatus for detecting interference in a wireless communications system. The invention compares the receiver FFT output of a received signal against known sequences such as the packet synchronization sequence, frame synchronization sequence, and channel estimation sequence. By comparing the reference signal to the known sequences, the invention estimates the instantaneous signal to noise ratio (SNR) for each tone of a wireless transmission. To improve the SNR estimate, the invention computes a weighted average across multiple OFDM symbols. The invention looks for significant increases (spikes) in the SNR as a way of distinguishing interfering signals from noise. The invention can store separate SNR estimates for each transmitter in a wireless network. One embodiment of the invention uses Viterbi branch metrics in conjunction with the estimated SNR to determine the presence of an interfering signal. If interference is detected the invention feeds the inverse of the SNR estimate into the Viterbi decoder or declares and erasure for that symbol.
摘要翻译：本发明提供一种用于检测无线通信系统中的干扰的方法和装置。本发明将接收信号的接收机FFT输出与诸如分组同步序列，帧同步序列和信道估计序列的已知序列进行比较。通过将参考信号与已知序列进行比较，本发明估计无线传输的每个音调的瞬时信噪比（SNR）。为了提高SNR估计，本发明计算跨多个OFDM符号的加权平均。本发明寻找SNR中的显着增加（尖峰）作为区分干扰信号和噪声的一种方式。本发明可以在无线网络中为每个发射机存储单独的SNR估计。本发明的一个实施例使用维特比分支度量结合估计的SNR来确定干扰信号的存在。如果检测到干扰，本发明将SNR估计的逆向馈送到维特比解码器中，或者声明并擦除该符号。

3. 发明申请

US20050237922A1 Virtual side channels for digital wireless communication systems 有权
标题翻译：用于数字无线通信系统的虚拟侧通道
公开(公告)号：US20050237922A1
公开(公告)日：2005-10-27
申请号：US11114646
申请日：2005-04-25
申请人： Matthew Shoemake , Sridhar Rajagopal , David Brenner
发明人： Matthew Shoemake , Sridhar Rajagopal , David Brenner
IPC分类号： H04J11/00 , H04L27/26
CPC分类号： H04L27/2602
摘要： The present invention provides a method for enabling side channel communication between wireless devices. In one embodiment of the invention the guard tones in wireless OFDM signals are used for side channel communication. In another embodiment of the invention, unused bits in OFDM symbols are used as side channels instead of being padded with zeros or random bits.
摘要翻译：本发明提供了一种用于实现无线设备之间的侧信道通信的方法。在本发明的一个实施例中，无线OFDM信号中的保护音调用于侧信道通信。在本发明的另一实施例中，OFDM符号中的未使用的比特用作侧信道，而不是用零或随机比特填充。

4. 发明申请

US20060026491A1 Rate control for packet-based wireless communication 有权
公开(公告)号：US20060026491A1
公开(公告)日：2006-02-02
申请号：US11179248
申请日：2005-07-12
申请人： Matthew Shoemake , Sridhar Rajagopal
发明人： Matthew Shoemake , Sridhar Rajagopal
IPC分类号： H03M13/00
CPC分类号： H04L1/20 , H04L1/0002 , H04L1/0026 , H04L1/1607
摘要： The present invention provides a method and system for controlling the data rate in packet based wireless communications. Then, using the probability of error, the invention calculates the throughput and drop probability for two or more data rates and selects the data rate with highest throughput. In one embodiment of the invention, the probability of error based on information passed back from the receiver regarding decoding errors. In another embodiment, the probability of error is based on acknowledgement packets returned by the receiver.

5. 发明申请

US20050271088A1 Method of using guard tones in OFDM systems for increasing robustness 有权
标题翻译：在OFDM系统中使用保护音调以提高鲁棒性的方法
公开(公告)号：US20050271088A1
公开(公告)日：2005-12-08
申请号：US11125714
申请日：2005-05-10
申请人： Matthew Shoemake , Sridhar Rajagopal , Lee Bradshaw
发明人： Matthew Shoemake , Sridhar Rajagopal , Lee Bradshaw
IPC分类号： H04J3/12 , H04L1/00 , H04L27/26
CPC分类号： H04L1/0059 , H04L1/0041 , H04L1/0069 , H04L1/0071 , H04L27/2602 , H04L27/261
摘要： The present invention provides a method and system for increasing communication robustness between wireless communication devices by transmitting data on Orthogonal Frequency Division Multiplexing (OFDM) guard tones. In one embodiment, punctured bits are sent on the guard tones. In an alternate embodiment, the full bandwidth provided by the guard tones in used to determine the optimal puncture pattern. The present invention can also use guard tones to duplicate data from those tones which are experiencing channel interference. The receiver feeds back information about tones in interference, and the transmitter send the interfered data on the guard tones. Guard tones are used for sending feedback information to the transmitter in order to increase system robustness. This provides the transmitter with information on how to use the guard tones and adapt the transmission data rates to maximize system performance.
摘要翻译：本发明提供一种用于通过在正交频分复用（OFDM）保护音上传送数据来增加无线通信设备之间的通信鲁棒性的方法和系统。在一个实施例中，穿孔位在保护音上发送。在替代实施例中，由保护音提供的用于确定最佳穿刺模式的全带宽。本发明还可以使用保护音来从经历信道干扰的那些音调复制数据。接收机反馈关于干扰中的音调的信息，并且发射机在保护音上发送被干扰的数据。保护音用于向发射机发送反馈信息，以提高系统的鲁棒性。这为发射机提供了有关如何使用保护音调和调整传输数据速率以使系统性能最大化的信息。

6. 发明授权

US07684505B2 Method and apparatus for encoding interleaving and mapping data to facilitate GBPS data rates in wireless systems 有权
标题翻译：用于编码交织和映射数据以便于无线系统中的GBPS数据速率的方法和装置
公开(公告)号：US07684505B2
公开(公告)日：2010-03-23
申请号：US11114752
申请日：2005-04-25
申请人： Sridhar Rajagopal , Matthew B. Shoemake , John Terry
发明人： Sridhar Rajagopal , Matthew B. Shoemake , John Terry
IPC分类号： H04L5/12
CPC分类号： H04L25/4917 , H03M13/2707 , H03M13/4161 , H04L1/0041 , H04L1/0054 , H04L1/006 , H04L1/0069 , H04L1/007 , H04L1/0071 , H04L27/34
摘要： A method and apparatus for encoding data for wireless transmission. The invention includes multi-level coding in which data is partitioned between two encoders, one for encoding Most Significant Bits (MSBs) and the other for encoding Least Significant Bits (LSBs). By partition bits separately for the MSBs and LSBs, the complexity of the decoder may be reduced. The MSBs and LSBs are interleaved such that each MSB is a function of just one LSB, simplifying branch metric selection during Viterbi decoding. This also allows parallel de-interleaving by the receiver, which reduces the interleaving latency of the receiver. A block interleaver jointly optimizes the symbol hamming distance of the symbols and the bit hamming distance of each constituent encoder for the MSBs and LSBs.
摘要翻译：一种用于编码无线传输数据的方法和装置。本发明包括多级编码，其中数据在两个编码器之间分配，一个用于编码最高有效位（MSB），另一个用于编码最低有效位（LSB）。通过分开MSB和LSB的分配位，解码器的复杂度可能会降低。 MSB和LSB被交错，使得每个MSB是仅一个LSB的函数，从而简化维特比解码期间的分支度量选择。这也允许接收机的并行解交织，这降低了接收机的交织等待时间。块交织器共同优化符号的符号汉明距离和每个组成编码器对于MSB和LSB的比特汉明距离。

7. 发明授权

US09143211B2 Multiple antenna transmission with per-antenna power constraints 有权
标题翻译：具有每天线功率限制的多天线传输
公开(公告)号：US09143211B2
公开(公告)日：2015-09-22
申请号：US13595811
申请日：2012-08-27
申请人： Zhouyue Pi , Omar El Ayach , Sridhar Rajagopal , Shadi Abu-Surra
发明人： Zhouyue Pi , Omar El Ayach , Sridhar Rajagopal , Shadi Abu-Surra
IPC分类号： H04B7/02 , H04B7/04 , H04B7/06 , H04B7/08 , H04W52/22 , H04W52/30 , H04W52/42 , H04L27/26
CPC分类号： H04B7/0465 , H04B7/02 , H04B7/0426 , H04B7/043 , H04B7/0617 , H04B7/0897 , H04L27/2626 , H04W52/225 , H04W52/30 , H04W52/42
摘要： A method, apparatus, and system to transmit signals using multiple antennas with per-antenna power constraints. The method includes initializing a precoding algorithm to a complex matrix. The precoding algorithm is for precoding signals transmitted by a plurality of antennas. The method includes iteratively processing the precoding algorithm on a per-antenna basis by, at each iteration, sequentially updating a precoder for each of the plurality of antennas. The method includes, after each iteration, determining whether the precoding algorithm has converged based on a change in a rate of mutual information across iterations. Additionally, the method includes, in response to determining that the precoding algorithm has converged, transmitting the signals using the precoding algorithm.
摘要翻译：一种使用具有每天线功率约束的多个天线发射信号的方法，装置和系统。该方法包括将预编码算法初始化为复数矩阵。预编码算法用于预编码由多个天线发送的信号。该方法包括在每个天线的基础上迭代地处理预编码算法，在每个迭代中，顺序地更新多个天线中的每个天线的预编码器。该方法包括在每次迭代之后，基于跨越迭代的互信息速率的变化来确定预编码算法是否已经收敛。此外，该方法包括响应于确定预编码算法已经收敛，使用预编码算法发送信号。

8. 发明授权

US08929473B2 Combining baseband processing and radio frequency beam steering in wireless communication systems 有权
标题翻译：在无线通信系统中组合基带处理和射频波束导向
公开(公告)号：US08929473B2
公开(公告)日：2015-01-06
申请号：US13552565
申请日：2012-07-18
申请人： Omar El Ayach , Sridhar Rajagopal , Shadi Abu-Surra , Zhouyue Pi
发明人： Omar El Ayach , Sridhar Rajagopal , Shadi Abu-Surra , Zhouyue Pi
IPC分类号： H04B7/02 , H04B7/04 , H04B7/06 , H04L25/02
CPC分类号： H04B7/0478 , H04B7/0456 , H04B7/0465 , H04B7/0617 , H04B7/0626 , H04B7/0632 , H04B7/0639 , H04B7/065 , H04B7/0695 , H04B7/088 , H04L25/0224
摘要： A method and apparatus enable combined baseband (BB) and radio frequency (RF) processing of signals. The method includes receiving, by a receiver, channel estimation information for a channel between a transmitter and the receiver. The method includes identifying a plurality of paths in the channel based on the channel estimation information. The method includes calculating an RF precoding matrix for precoding one or more signals to be transmitted on each of the identified paths. The RF precoding matrix includes a phase shift for each of the identified paths. Additionally, the method includes calculating a BB precoding matrix for precoding the one or more signals by a BB precoding unit associated with the transmitter.
摘要翻译：一种方法和装置使能信号的组合基带（BB）和射频（RF）处理。该方法包括由接收机接收用于发射机和接收机之间的信道的信道估计信息。该方法包括基于信道估计信息识别信道中的多个路径。该方法包括计算一个RF预编码矩阵，用于对每个所识别的路径上要发送的一个或多个信号进行预编码。 RF预编码矩阵包括针对每个所识别的路径的相移。此外，该方法包括：计算BB预编码矩阵，用于通过与发射机相关联的BB预编码单元对一个或多个信号进行预编码。

9. 发明授权

US08855496B2 Optical clock rate negotiation for supporting asymmetric clock rates for visible light communication 有权
标题翻译：用于支持可见光通信的非对称时钟速率的光时钟速率协商
公开(公告)号：US08855496B2
公开(公告)日：2014-10-07
申请号：US12975225
申请日：2010-12-21
申请人： Sridhar Rajagopal , Eran Pisek , Farooq Khan , Ying Li
发明人： Sridhar Rajagopal , Eran Pisek , Farooq Khan , Ying Li
IPC分类号： H04B10/00 , H04B10/114 , H04B10/116
CPC分类号： H04B10/116 , H04B10/1149
摘要： A method and apparatus conduct an optical clock rate negotiation to support asymmetric clock rates for visible light communication (VLC) in a VLC device. A first frame that includes a receiver clock rate supported by a first VLC device is transmitted at a predetermined clock rate. A response frame that includes a receiver clock rate supported by a second VLC device is received from the second VLC device. A transmission clock rate of the first VLC device is selected based on the response frame from the second VLC device. Subsequent frames for data communication are transmitted to the second VLC device at the selected transmission clock rate of the first device. Alternatively, when conducting optical clock negotiation in the PHY layer, multiple clock rates are supported within a single frame.
摘要翻译：一种方法和装置进行光时钟速率协商以支持VLC设备中可见光通信（VLC）的非对称时钟速率。以预定的时钟速率发送包括由第一VLC设备支持的接收机时钟速率的第一帧。从第二VLC设备接收包括由第二VLC设备支持的接收机时钟速率的响应帧。基于来自第二VLC设备的响应帧来选择第一VLC设备的传输时钟速率。用于数据通信的后续帧以所选择的第一设备的传输时钟速率发送到第二VLC设备。或者，当在PHY层中进行光时钟协商时，在单个帧内支持多个时钟速率。

10. 发明授权

US08731406B2 Apparatus and method for generating high resolution frames for dimming and visibility support in visible light communication 有权
标题翻译：用于在可见光通信中产生用于调光和可见度支持的高分辨率帧的装置和方法
公开(公告)号：US08731406B2
公开(公告)日：2014-05-20
申请号：US12767678
申请日：2010-04-26
申请人： Sridhar Rajagopal , Farooq Khan
发明人： Sridhar Rajagopal , Farooq Khan
IPC分类号： H04B10/00 , G09G5/10
CPC分类号： H04B10/1149 , H04B10/116
摘要： For use in a visible light communication (VLC) network, a method for generating high resolution visibility frames for visibility or dimming support. The method includes determining a required visibility for the high resolution frames. The method also includes generating a pattern that meets the determined required visibility, the pattern having a first quantity of first low resolution frames and a second quantity of second low resolution frames. The method further includes transmitting the pattern to achieve the required high resolution frames.
摘要翻译：为了在可见光通信（VLC）网络中使用，用于产生用于可见度或调光支持的高分辨率可见性帧的方法。该方法包括确定高分辨率帧所需的可视性。该方法还包括产生满足所确定的所需可见度的图案，该图案具有第一数量的第一低分辨率帧和第二数量的第二低分辨率帧。该方法还包括发送图案以实现所需的高分辨率帧。

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