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    • 1. 发明申请
    • Wireless Access Modem Having Downstream Channel Resynchronization Method
    • 具有下行信道重新同步方法的无线接入调制解调器
    • US20070089042A1
    • 2007-04-19
    • US11470916
    • 2006-09-07
    • Xiaolin LuSrinath HosurManish GoelMichael Polley
    • Xiaolin LuSrinath HosurManish GoelMichael Polley
    • H03M13/00
    • H04W56/009H04L7/048H04L7/10H04W24/00H04W74/00
    • 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.
    • 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。
    • 4. 发明申请
    • Wireless access modem having downstream channel resynchronization method
    • 具有下行信道重新同步方式的无线接入调制解调器
    • US20050044472A1
    • 2005-02-24
    • US10643119
    • 2003-08-18
    • Xiaolin LuSrinath HosurManish GoelMichael Polley
    • Xiaolin LuSrinath HosurManish GoelMichael Polley
    • H03M13/00H04B1/38H04L7/04H04L7/10
    • H04W56/009H04L7/048H04L7/10H04W24/00H04W74/00
    • 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.
    • 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
    • MIMO decoding
    • MIMO解码
    • US07724832B2
    • 2010-05-25
    • US10857417
    • 2004-05-27
    • Srinath HosurJaiganesh BalakrishnanMichael PolleyManish GoelMuhammad Ikram
    • Srinath HosurJaiganesh BalakrishnanMichael PolleyManish GoelMuhammad Ikram
    • H04K1/10
    • H04L27/2647H04L25/0204H04L25/067
    • 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.
    • 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
    • MIMO decoding
    • MIMO解码
    • US20050265465A1
    • 2005-12-01
    • US10857417
    • 2004-05-27
    • Srinath HosurJaiganesh BalakrishnanMuhammed IkramManish GoelMichael Polley
    • Srinath HosurJaiganesh BalakrishnanMuhammed IkramManish GoelMichael Polley
    • H03D1/00H04B7/02H04B7/10H04L25/02H04L25/06H04L27/06H04L27/26
    • H04L27/2647H04L25/0204H04L25/067
    • 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.
    • 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。