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1. 发明申请

US20070089042A1 Wireless Access Modem Having Downstream Channel Resynchronization Method 有权
标题翻译：具有下行信道重新同步方法的无线接入调制解调器
公开(公告)号：US20070089042A1
公开(公告)日：2007-04-19
申请号：US11470916
申请日：2006-09-07
申请人： Xiaolin Lu , Srinath Hosur , Manish Goel , Michael Polley
发明人： Xiaolin Lu , Srinath Hosur , Manish Goel , Michael Polley
IPC分类号： H03M13/00
CPC分类号： H04W56/009 , H04L7/048 , H04L7/10 , H04W24/00 , H04W74/00
摘要： A resynchronization method for use in a data communication system having a first device configured to transmit data at a symbol rate to a second device. The second device includes a Reed Solomon (RS) decoder having a RS lock indicator and a Moving Picture Experts Group (MPEG) Protocol Interface (MPI) having a MPI lock indicator, wherein the RS and MPI lock indicators are monitored. Four different states, defined by the values of the RS and MPI lock indicators, determine whether the data communication system will wait for the RS decoded and the MPI hardware block to resynchronize, whether an intermediate-subset of the channel acquisition algorithm is performed or whether the entire channel acquisition algorithm is performed. The method of resynchronization described herein recovers synchronization within a predetermined time without the layers above the physical link layer having knowledge.
摘要翻译：一种用于具有第一设备的数据通信系统中的再同步方法，该第一设备被配置为以符号速率向第二设备发送数据。第二装置包括具有RS锁指示器的Reed Solomon（RS）解码器和具有MPI锁定指示器的运动图像专家组（MPEG）协议接口（MPI），其中监视RS和MPI锁定指示符。由RS和MPI锁指示器的值定义的四种不同状态确定数据通信系统是否将等待RS解码和MPI硬件块重新同步，无论是执行信道获取算法的中间子集还是执行执行整个信道获取算法。本文所述的重新同步的方法在预定时间内恢复同步，而不具有具有知识的物理链路层之上的层。

2. 发明申请

US20060007908A1 Linearly independent preambles for MIMO channel estimation with backward compatibility 有权
公开(公告)号：US20060007908A1
公开(公告)日：2006-01-12
申请号：US10884363
申请日：2004-07-02
申请人： Srinath Hosur , Michael Polley , Manish Goel
发明人： Srinath Hosur , Michael Polley , Manish Goel
IPC分类号： H04J3/06 , H04L12/28
CPC分类号： H04L1/0083 , H04B7/0678 , H04L7/041 , H04L7/06 , H04L27/2613
摘要： A device and a method of characterizing a communications channel. The method includes transmitting a first part of a packet preamble using two or more antennas and transmitting a second part of the packet preamble using the two or more antennas. Each antenna transmits an orthogonal encoding of the second part of the packet preamble. The method also includes transmitting a packet header using the two or more antennas and transmitting a packet payload using the two or more antennas. Each antenna transmits an orthogonal encoding of the packet header. The packet payload may be encoded across the transmissions of the two or more antennas.

3. 发明申请

US20050163041A1 Hybrid IMMSE-LMMSE receiver processing technique and apparatus for a MIMO WLAN 有权
标题翻译：用于MIMO WLAN的混合IMMSE-LMMSE接收机处理技术和装置
公开(公告)号：US20050163041A1
公开(公告)日：2005-07-28
申请号：US10765009
申请日：2004-01-26
申请人： Muhammad Ikram , Srinath Hosur , Michael Polley , Manish Goel
发明人： Muhammad Ikram , Srinath Hosur , Michael Polley , Manish Goel
IPC分类号： H04B1/707 , H04B7/02 , H04J11/00 , H04L27/26
CPC分类号： H04B7/02 , H04B1/7105 , H04B1/7107 , H04L1/0631 , H04L1/0656 , H04L27/2647
摘要： A Hybrid IMMSE-LMMSE receiver processing technique predicts performance of and selects between iterative and non-iterative decoding of symbols based on an intelligent metric. Based on a pre-specified criterion, the receiver determines if a correct first-stage decision is made or not. If a correct decision is made, then it follows iterative processing like in BLAST. Alternatively, if a wrong decision is found to have occurred, the receiver resorts to LMMSE estimation processing.
摘要翻译：混合IMMSE-LMMSE接收机处理技术基于智能度量预测符号的迭代和非迭代解码之间的性能并进行选择。根据预先指定的标准，接收机确定是否做出正确的第一阶段决定。如果做出正确的决定，那么它将像BLAST一样进行迭代处理。或者，如果发现错误的决定已经发生，接收机将采用LMMSE估计处理。

4. 发明申请

US20050044472A1 Wireless access modem having downstream channel resynchronization method 有权
标题翻译：具有下行信道重新同步方式的无线接入调制解调器
公开(公告)号：US20050044472A1
公开(公告)日：2005-02-24
申请号：US10643119
申请日：2003-08-18
申请人： Xiaolin Lu , Srinath Hosur , Manish Goel , Michael Polley
发明人： Xiaolin Lu , Srinath Hosur , Manish Goel , Michael Polley
IPC分类号： H03M13/00 , H04B1/38 , H04L7/04 , H04L7/10
CPC分类号： H04W56/009 , H04L7/048 , H04L7/10 , H04W24/00 , H04W74/00
摘要： A resynchronization method for use in a data communication system having a first device configured to transmit data at a symbol rate to a second device. The second device includes a Reed Solomon (RS) decoder having a RS lock indicator and a Moving Picture Experts Group (MPEG) Protocol Interface (MPI) having a MPI lock indicator, wherein the RS and the MPI lock indicators are monitored. Four different states, defined by the values of the RS and MPI lock indicators, determine whether the data communication system will wait for the RS decoder and the MPI hardware block to resynchronize, whether an intermediate-subset of the channel acquisition algorithm is performed or whether the entire channel acquisition algorithm is performed. The method for resynchronization described herein recovers synchronization within a predetermined time without the layers above the physical link layer having knowledge.
摘要翻译：一种用于具有第一设备的数据通信系统中的再同步方法，该第一设备被配置为以符号速率向第二设备发送数据。第二装置包括具有RS锁定指示器的里德所罗门（RS）解码器和具有MPI锁定指示器的运动图像专家组（MPEG）协议接口（MPI），其中监测RS和MPI锁定指示符。由RS和MPI锁指示符的值定义的四种不同状态确定数据通信系统是否将等待RS解码器和MPI硬件块重新同步，无论是执行信道获取算法的中间子集还是执行执行整个信道获取算法。本文所述的用于重新同步的方法在预定时间内恢复同步，而不具有物理链路层之上的层具有知识。

5. 发明授权

US07724832B2 MIMO decoding 有权
标题翻译： MIMO解码
公开(公告)号：US07724832B2
公开(公告)日：2010-05-25
申请号：US10857417
申请日：2004-05-27
申请人： Srinath Hosur , Jaiganesh Balakrishnan , Michael Polley , Manish Goel , Muhammad Ikram
发明人： Srinath Hosur , Jaiganesh Balakrishnan , Michael Polley , Manish Goel , Muhammad Ikram
IPC分类号： H04K1/10
CPC分类号： H04L27/2647 , H04L25/0204 , H04L25/067
摘要： In MIMO wireless communications employing LMMSE receiver, the symbols transmitted through a transmit antenna are estimated at the receiver in the presence of interference consisting of two main components: one due to the additive noise and the other due to (interfering) symbols transmitted via the remaining antennas. This has been shown to hamper the performance of a communication system resulting in incorrect symbol decisions, particularly at low SNR. IMMSE has been devised as a solution to cope with this problem; In IMMSE processing, the symbols sent via each transmit antenna are decoded iteratively. In each stage of processing, the received signal is updated by removing the contribution of symbols detected in the previous iterations. In principle, this reduces the additive interference in which the desired symbols are embedded in. Therefore, the interference level should reduce monotonically as one goes down in processing order. In a noisy environment, however, any incorrect decision made on a symbol in an iteration leaves its contribution in the updated received signal available for processing in the following iterations. Fortunately, if the level of interference is estimated and the soft bits are scaled appropriately by the estimated interference power, the performance of IMMSE receiver can be greatly improved. Preferred embodiments estimate the interference by computing the probability of error in decoding the symbols of the previous stage(s). The computation of decision error probability depends on the constellation size of transmitted symbols and introduces very little processing overhead.
摘要翻译：在采用LMMSE接收机的MIMO无线通信中，在存在由两个主要部分组成的干扰的接收机处估计通过发射天线发射的符号：一个由于加性噪声而导致的，另一个是由于通过剩余的天线。已经显示出妨碍通信系统的性能，导致不正确的符号决定，特别是在低SNR下。 IMMSE已被设计为解决这个问题的办法; 在IMMSE处理中，经由每个发送天线发送的符号被迭代地解码。在每个处理阶段，通过去除在先前迭代中检测到的符号的贡献来更新接收到的信号。原则上，这降低了嵌入期望符号的附加干扰。因此，干扰电平在处理顺序下降时单调减少。然而，在嘈杂的环境中，在迭代中对符号做出的任何不正确的决定使其在更新的接收信号中的贡献可用于在以下迭代中进行处理。幸运的是，如果估计干扰水平，并通过估计的干扰功率适当地缩放软比特，则可以大大提高IMMSE接收机的性能。优选实施例通过计算解码前一级的符号的误差概率来估计干扰。决策误差概率的计算取决于传输符号的星座大小，并引入很少的处理开销。

6. 发明申请

US20050265465A1 MIMO decoding 有权
标题翻译： MIMO解码
公开(公告)号：US20050265465A1
公开(公告)日：2005-12-01
申请号：US10857417
申请日：2004-05-27
申请人： Srinath Hosur , Jaiganesh Balakrishnan , Muhammed Ikram , Manish Goel , Michael Polley
发明人： Srinath Hosur , Jaiganesh Balakrishnan , Muhammed Ikram , Manish Goel , Michael Polley
IPC分类号： H03D1/00 , H04B7/02 , H04B7/10 , H04L25/02 , H04L25/06 , H04L27/06 , H04L27/26
CPC分类号： H04L27/2647 , H04L25/0204 , H04L25/067
摘要： In MIMO wireless communications employing LMMSE receiver, the symbols transmitted through a transmit antenna are estimated at the receiver in the presence of interference consisting of two main components: one due to the additive noise and the other due to (interfering) symbols transmitted via the remaining antennas. This has been shown to hamper the performance of a communication system resulting in incorrect symbol decisions, particularly at low SNR. IMMSE has been devised as a solution to cope with this problem; In IMMSE processing, the symbols sent via each transmit antenna are decoded iteratively. In each stage of processing, the received signal is updated by removing the contribution of symbols detected in the previous iterations. In principle, this reduces the additive interference in which the desired symbols are embedded in. Therefore, the interference level should reduce monotonically as one goes down in processing order. In a noisy environment, however, any incorrect decision made on a symbol in an iteration leaves its contribution in the updated received signal available for processing in the following iterations. Fortunately, if the level of interference is estimated and the soft bits are scaled appropriately by the estimated interference power, the performance of IMMSE receiver can be greatly improved. Preferred embodiments estimate the interference by computing the probability of error in decoding the symbols of the previous stage(s). The computation of decision error probability depends on the constellation size of transmitted symbols and introduces very little processing overhead.
摘要翻译：在采用LMMSE接收机的MIMO无线通信中，在存在由两个主要部分组成的干扰的接收机处估计通过发射天线发射的符号：一个由于加性噪声而导致的，另一个是由于通过剩余的天线。已经显示出妨碍通信系统的性能，导致不正确的符号决定，特别是在低SNR下。 IMMSE已被设计为解决这个问题的办法; 在IMMSE处理中，经由每个发送天线发送的符号被迭代地解码。在每个处理阶段，通过去除在先前迭代中检测到的符号的贡献来更新接收到的信号。原则上，这降低了嵌入期望符号的附加干扰。因此，干扰电平在处理顺序下降时单调减少。然而，在嘈杂的环境中，在迭代中对符号做出的任何不正确的决定使其在更新的接收信号中的贡献可用于在以下迭代中进行处理。幸运的是，如果估计干扰水平，并通过估计的干扰功率适当地缩放软比特，则可以大大提高IMMSE接收机的性能。优选实施例通过计算解码前一级的符号的误差概率来估计干扰。决策误差概率的计算取决于传输符号的星座大小，并引入很少的处理开销。

7. 发明申请

US20050136935A1 Signal field controller, method of controlling and MIMO transmitter employing the same 有权
标题翻译：信号场控制器，控制方法和采用该方法的MIMO发射机
公开(公告)号：US20050136935A1
公开(公告)日：2005-06-23
申请号：US10744310
申请日：2003-12-22
申请人： Srinath Hosur , Srikanth Gummadi , Michael Polley , Manish Goel
发明人： Srinath Hosur , Srikanth Gummadi , Michael Polley , Manish Goel
IPC分类号： H04Q7/20
CPC分类号： H04B7/0689 , H04B7/04
摘要： For use with a multiple-input, multiple-output (MIMO) transmitter, a signal field controller, a method of controlling signal fields and a MIMO transmitter incorporating the controller or the method. In one embodiment, the controller includes: (1) a primary signal field mode indicator configured to cause a primary signal field to indicate a presence of a supplemental signal field and provide the primary signal field to the MIMO transmitter for transmission thereby and (2) a supplemental signal field generator coupled to the primary signal field mode indicator and configured to provide a supplemental signal field to the MIMO transmitter for further transmission thereby only when the primary signal field indicates the presence.
摘要翻译：用于多输入多输出（MIMO）发射机，信号场控制器，控制信号场的方法和包含控制器或方法的MIMO发射机。在一个实施例中，控制器包括：（1）主信号场模式指示器，其被配置为使主信号域指示补充信号场的存在，并将主信号字段提供给MIMO发射机用于传输，以及（2）辅助信号场发生器，其耦合到主信号场模式指示符并且被配置为仅在主信号字段指示存在时向MIMO发射机提供补充信号字段以进一步发送。

8. 发明授权

US07522674B2 Linearly independent preambles for MIMO channel estimation with backward compatibility 有权
标题翻译：用于具有向后兼容性的MIMO信道估计的线性独立前导码
公开(公告)号：US07522674B2
公开(公告)日：2009-04-21
申请号：US10884363
申请日：2004-07-02
申请人： Srinath Hosur , Michael O. Polley , Manish Goel
发明人： Srinath Hosur , Michael O. Polley , Manish Goel
IPC分类号： H04B7/04 , H04L27/28
CPC分类号： H04L1/0083 , H04B7/0678 , H04L7/041 , H04L7/06 , H04L27/2613
摘要： A device and a method of characterizing a communications channel. The method includes transmitting a first part of a packet preamble using two or more antennas and transmitting a second part of the packet preamble using the two or more antennas. Each antenna transmits an orthogonal encoding of the second part of the packet preamble. The method also includes transmitting a packet header using the two or more antennas and transmitting a packet payload using the two or more antennas. Each antenna transmits an orthogonal encoding of the packet header. The packet payload may be encoded across the transmissions of the two or more antennas.
摘要翻译：一种表征通信信道的设备和方法。该方法包括使用两个或多个天线发送分组前导码的第一部分，并使用两个或更多个天线发送分组前导码的第二部分。每个天线发送分组前同步码的第二部分的正交编码。该方法还包括使用两个或多个天线发送分组报头，并使用两个或更多个天线发送分组有效载荷。每个天线发送分组报头的正交编码。分组有效载荷可以跨越两个或更多个天线的传输进行编码。

9. 发明授权

US07184499B2 Method of timing compensation for OFDM-based wireless communication system coded parameter signaling (CPS) decode operations 有权
标题翻译：基于OFDM的无线通信系统编码参数信令（CPS）解码操作的定时补偿方法
公开(公告)号：US07184499B2
公开(公告)日：2007-02-27
申请号：US10438242
申请日：2003-05-14
申请人： David P. Magee , Srinath Hosur , Manish Goel
发明人： David P. Magee , Srinath Hosur , Manish Goel
IPC分类号： H03D1/04
CPC分类号： H04L27/2662 , H04L27/2675
摘要： A method of determining CPS data in an OFDM-based, wireless communication system resolves the phase angle difference between training tones in a burst without CPS data and training tones in a burst with CPS data and then demodulates the resulting difference phase angles to determine the CPS data. The method achieves timing correction/compensation in CPS decode operations associated with OFDM-based, wireless communication systems.
摘要翻译：一种在基于OFDM的无线通信系统中确定CPS数据的方法，用CPS数据解析突发中没有CPS数据和训练音调的脉冲串中的训练音之间的相位角差，然后解调得到的差相位角以确定CPS 数据。该方法在与基于OFDM的无线通信系统相关联的CPS解码操作中实现定时校正/补偿。

10. 发明授权

US07321564B2 Hybrid IMMSE-LMMSE receiver processing technique and apparatus for a MIMO WLAN 有权
标题翻译：用于MIMO WLAN的混合IMMSE-LMMSE接收机处理技术和装置
公开(公告)号：US07321564B2
公开(公告)日：2008-01-22
申请号：US10765009
申请日：2004-01-26
申请人： Muhammad Zubair Ikram , Srinath Hosur , Michael O. Polley , Manish Goel
发明人： Muhammad Zubair Ikram , Srinath Hosur , Michael O. Polley , Manish Goel
IPC分类号： H04J1/16
CPC分类号： H04B7/02 , H04B1/7105 , H04B1/7107 , H04L1/0631 , H04L1/0656 , H04L27/2647
摘要： A Hybrid IMMSE-LMMSE receiver processing technique predicts performance of and selects between iterative and non-iterative decoding of symbols based on an intelligent metric. Based on a pre-specified criterion, the receiver determines if a correct first-stage decision is made or not. If a correct decision is made, then it follows iterative processing like in BLAST. Alternatively, if a wrong decision is found to have occurred, the receiver resorts to LMMSE estimation processing.
摘要翻译：混合IMMSE-LMMSE接收机处理技术基于智能度量预测符号的迭代和非迭代解码之间的性能并进行选择。根据预先指定的标准，接收机确定是否做出正确的第一阶段决定。如果做出正确的决定，那么它将像BLAST一样进行迭代处理。或者，如果发现错误的决定已经发生，接收机将采用LMMSE估计处理。

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